Merge tag 'mtd/for-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux

Pull MTD updates from Miquel Raynal:
 "MTD core:
   - drop inactive maintainers, update the repositories and add IRC
     channel
   - debugfs functions improvements
   - initialize more structure parameters
   - misc fixes reported by robots

  MTD devices:
   - spear_smi: Fixed Write Burst mode
   - new Intel IXP4xx flash probing hook

  Raw NAND core:
   - useless extra checks dropped
   - update the detection of the bad block markers position

  Raw NAND controller drivers:
   - Cadence: new driver
   - Brcmnand: support for flash-dma v0 + fixes
   - Denali: drop support for the legacy controller/chip DT representation
   - superfluous dev_err() calls removed

  SPI NOR core changes:
   - introduce 'struct spi_nor_controller_ops'
   - clean the Register Operations methods
   - use dev_dbg insted of dev_err for low level info
   - fix retlen handling in sst_write()
   - fix silent truncations in spi_nor_read and spi_nor_read_raw()
   - fix the clearing of QE bit on lock()/unlock()
   - rework the disabling of the block write protection
   - rework the Quad Enable methods
   - make sure nor->spimem and nor->controller_ops are mutually exclusive
   - set default Quad Enable method for ISSI flashes
   - add support for few flashes

  SPI NOR controller drivers changes:
   - intel-spi:
      - support chips without software sequencer
      - add support for Intel Cannon Lake and Intel Comet Lake-H flashes

  CFI core changes:
   - code cleanups related useless initializers and coding style issues
   - fix for a possible double free problem in cfi_cmdset_0002
   - improved HyperFlash error reporting and handling in cfi_cmdset_0002 core"

* tag 'mtd/for-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux: (73 commits)
  mtd: devices: fix mchp23k256 read and write
  mtd: no need to check return value of debugfs_create functions
  mtd: spi-nor: Set default Quad Enable method for ISSI flashes
  mtd: spi-nor: Add support for is25wp256
  mtd: spi-nor: Add support for w25q256jw
  mtd: spi-nor: Move condition to avoid a NULL check
  mtd: spi-nor: Make sure nor->spimem and nor->controller_ops are mutually exclusive
  mtd: spi-nor: Rename Quad Enable methods
  mtd: spi-nor: Merge spansion Quad Enable methods
  mtd: spi-nor: Rename CR_QUAD_EN_SPAN to SR2_QUAD_EN_BIT1
  mtd: spi-nor: Extend the SR Read Back test
  mtd: spi-nor: Rework the disabling of block write protection
  mtd: spi-nor: Fix clearing of QE bit on lock()/unlock()
  mtd: cfi_cmdset_0002: fix delayed error detection on HyperFlash
  mtd: cfi_cmdset_0002: only check errors when ready in cfi_check_err_status()
  mtd: cfi_cmdset_0002: don't free cfi->cfiq in error path of cfi_amdstd_setup()
  mtd: cfi_cmdset_*: kill useless 'ret' variable initializers
  mtd: cfi_util: use DIV_ROUND_UP() in cfi_udelay()
  mtd: spi-nor: Print debug message when the read back test fails
  mtd: spi-nor: Check all the bits written, not just the BP ones
  ...

43 files changed, 4401 insertions, 986 deletions

diff --git a/drivers/mtd/chips/cfi_cmdset_0001.c b/drivers/mtd/chips/cfi_cmdset_0001.c
index 79a53cb8507b..00a79489067c 100644
--- a/drivers/mtd/chips/cfi_cmdset_0001.c
+++ b/drivers/mtd/chips/cfi_cmdset_0001.c
@@ -1353,7 +1353,7 @@ static int do_point_onechip (struct map_info *map, struct flchip *chip, loff_t a
 {
 	unsigned long cmd_addr;
 	struct cfi_private *cfi = map->fldrv_priv;
-	int ret = 0;
+	int ret;
 
 	adr += chip->start;
 
@@ -1383,7 +1383,7 @@ static int cfi_intelext_point(struct mtd_info *mtd, loff_t from, size_t len,
 	struct cfi_private *cfi = map->fldrv_priv;
 	unsigned long ofs, last_end = 0;
 	int chipnum;
-	int ret = 0;
+	int ret;
 
 	if (!map->virt)
 		return -EINVAL;
@@ -1550,7 +1550,7 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
 {
 	struct cfi_private *cfi = map->fldrv_priv;
 	map_word status, write_cmd;
-	int ret=0;
+	int ret;
 
 	adr += chip->start;
 
@@ -1624,7 +1624,7 @@ static int cfi_intelext_write_words (struct mtd_info *mtd, loff_t to , size_t le
 {
 	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
-	int ret = 0;
+	int ret;
 	int chipnum;
 	unsigned long ofs;
 
@@ -1871,7 +1871,7 @@ static int cfi_intelext_writev (struct mtd_info *mtd, const struct kvec *vecs,
 	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
 	int wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
-	int ret = 0;
+	int ret;
 	int chipnum;
 	unsigned long ofs, vec_seek, i;
 	size_t len = 0;
diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index cf8c8be40a9c..04b383bc3947 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -123,19 +123,23 @@ static int cfi_use_status_reg(struct cfi_private *cfi)
 		(extp->SoftwareFeatures & poll_mask) == CFI_POLL_STATUS_REG;
 }
 
-static void cfi_check_err_status(struct map_info *map, struct flchip *chip,
-				 unsigned long adr)
+static int cfi_check_err_status(struct map_info *map, struct flchip *chip,
+				unsigned long adr)
 {
 	struct cfi_private *cfi = map->fldrv_priv;
 	map_word status;
 
 	if (!cfi_use_status_reg(cfi))
-		return;
+		return 0;
 
 	cfi_send_gen_cmd(0x70, cfi->addr_unlock1, chip->start, map, cfi,
 			 cfi->device_type, NULL);
 	status = map_read(map, adr);
 
+	/* The error bits are invalid while the chip's busy */
+	if (!map_word_bitsset(map, status, CMD(CFI_SR_DRB)))
+		return 0;
+
 	if (map_word_bitsset(map, status, CMD(0x3a))) {
 		unsigned long chipstatus = MERGESTATUS(status);
 
@@ -151,7 +155,12 @@ static void cfi_check_err_status(struct map_info *map, struct flchip *chip,
 		if (chipstatus & CFI_SR_SLSB)
 			pr_err("%s sector write protected, status %lx\n",
 			       map->name, chipstatus);
+
+		/* Erase/Program status bits are set on the operation failure */
+		if (chipstatus & (CFI_SR_ESB | CFI_SR_PSB))
+			return 1;
 	}
+	return 0;
 }
 
 /* #define DEBUG_CFI_FEATURES */
@@ -785,7 +794,6 @@ static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd)
 	kfree(mtd->eraseregions);
 	kfree(mtd);
 	kfree(cfi->cmdset_priv);
-	kfree(cfi->cfiq);
 	return NULL;
 }
 
@@ -848,20 +856,16 @@ static int __xipram chip_good(struct map_info *map, struct flchip *chip,
 
 	if (cfi_use_status_reg(cfi)) {
 		map_word ready = CMD(CFI_SR_DRB);
-		map_word err = CMD(CFI_SR_PSB | CFI_SR_ESB);
+
 		/*
 		 * For chips that support status register, check device
-		 * ready bit and Erase/Program status bit to know if
-		 * operation succeeded.
+		 * ready bit
 		 */
 		cfi_send_gen_cmd(0x70, cfi->addr_unlock1, chip->start, map, cfi,
 				 cfi->device_type, NULL);
 		curd = map_read(map, addr);
 
-		if (map_word_andequal(map, curd, ready, ready))
-			return !map_word_bitsset(map, curd, err);
-
-		return 0;
+		return map_word_andequal(map, curd, ready, ready);
 	}
 
 	oldd = map_read(map, addr);
@@ -1699,8 +1703,11 @@ static int __xipram do_write_oneword_once(struct map_info *map,
 			break;
 		}
 
-		if (chip_good(map, chip, adr, datum))
+		if (chip_good(map, chip, adr, datum)) {
+			if (cfi_check_err_status(map, chip, adr))
+				ret = -EIO;
 			break;
+		}
 
 		/* Latency issues. Drop the lock, wait a while and retry */
 		UDELAY(map, chip, adr, 1);
@@ -1713,7 +1720,7 @@ static int __xipram do_write_oneword_start(struct map_info *map,
 					   struct flchip *chip,
 					   unsigned long adr, int mode)
 {
-	int ret = 0;
+	int ret;
 
 	mutex_lock(&chip->mutex);
 
@@ -1773,7 +1780,6 @@ static int __xipram do_write_oneword_retry(struct map_info *map,
 	ret = do_write_oneword_once(map, chip, adr, datum, mode, cfi);
 	if (ret) {
 		/* reset on all failures. */
-		cfi_check_err_status(map, chip, adr);
 		map_write(map, CMD(0xF0), chip->start);
 		/* FIXME - should have reset delay before continuing */
 
@@ -1791,7 +1797,7 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
 				     unsigned long adr, map_word datum,
 				     int mode)
 {
-	int ret = 0;
+	int ret;
 
 	adr += chip->start;
 
@@ -1815,7 +1821,7 @@ static int cfi_amdstd_write_words(struct mtd_info *mtd, loff_t to, size_t len,
 {
 	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
-	int ret = 0;
+	int ret;
 	int chipnum;
 	unsigned long ofs, chipstart;
 	DECLARE_WAITQUEUE(wait, current);
@@ -1970,12 +1976,17 @@ static int __xipram do_write_buffer_wait(struct map_info *map,
 		 */
 		if (time_after(jiffies, timeo) &&
 		    !chip_good(map, chip, adr, datum)) {
+			pr_err("MTD %s(): software timeout, address:0x%.8lx.\n",
+			       __func__, adr);
 			ret = -EIO;
 			break;
 		}
 
-		if (chip_good(map, chip, adr, datum))
+		if (chip_good(map, chip, adr, datum)) {
+			if (cfi_check_err_status(map, chip, adr))
+				ret = -EIO;
 			break;
+		}
 
 		/* Latency issues. Drop the lock, wait a while and retry */
 		UDELAY(map, chip, adr, 1);
@@ -2014,7 +2025,7 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
 				    int len)
 {
 	struct cfi_private *cfi = map->fldrv_priv;
-	int ret = -EIO;
+	int ret;
 	unsigned long cmd_adr;
 	int z, words;
 	map_word datum;
@@ -2071,12 +2082,8 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
 				chip->word_write_time);
 
 	ret = do_write_buffer_wait(map, chip, adr, datum);
-	if (ret) {
-		cfi_check_err_status(map, chip, adr);
+	if (ret)
 		do_write_buffer_reset(map, chip, cfi);
-		pr_err("MTD %s(): software timeout, address:0x%.8lx.\n",
-		       __func__, adr);
-	}
 
 	xip_enable(map, chip, adr);
 
@@ -2095,7 +2102,7 @@ static int cfi_amdstd_write_buffers(struct mtd_info *mtd, loff_t to, size_t len,
 	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
 	int wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
-	int ret = 0;
+	int ret;
 	int chipnum;
 	unsigned long ofs;
 
@@ -2232,7 +2239,7 @@ static int do_panic_write_oneword(struct map_info *map, struct flchip *chip,
 	struct cfi_private *cfi = map->fldrv_priv;
 	int retry_cnt = 0;
 	map_word oldd;
-	int ret = 0;
+	int ret;
 	int i;
 
 	adr += chip->start;
@@ -2271,9 +2278,9 @@ retry:
 		udelay(1);
 	}
 
-	if (!chip_good(map, chip, adr, datum)) {
+	if (!chip_good(map, chip, adr, datum) ||
+	    cfi_check_err_status(map, chip, adr)) {
 		/* reset on all failures. */
-		cfi_check_err_status(map, chip, adr);
 		map_write(map, CMD(0xF0), chip->start);
 		/* FIXME - should have reset delay before continuing */
 
@@ -2307,7 +2314,7 @@ static int cfi_amdstd_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
 	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
 	unsigned long ofs, chipstart;
-	int ret = 0;
+	int ret;
 	int chipnum;
 
 	chipnum = to >> cfi->chipshift;
@@ -2411,7 +2418,7 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip)
 	unsigned long timeo = jiffies + HZ;
 	unsigned long int adr;
 	DECLARE_WAITQUEUE(wait, current);
-	int ret = 0;
+	int ret;
 	int retry_cnt = 0;
 
 	adr = cfi->addr_unlock1;
@@ -2467,8 +2474,11 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip)
 			chip->erase_suspended = 0;
 		}
 
-		if (chip_good(map, chip, adr, map_word_ff(map)))
+		if (chip_good(map, chip, adr, map_word_ff(map))) {
+			if (cfi_check_err_status(map, chip, adr))
+				ret = -EIO;
 			break;
+		}
 
 		if (time_after(jiffies, timeo)) {
 			printk(KERN_WARNING "MTD %s(): software timeout\n",
@@ -2483,7 +2493,6 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip)
 	/* Did we succeed? */
 	if (ret) {
 		/* reset on all failures. */
-		cfi_check_err_status(map, chip, adr);
 		map_write(map, CMD(0xF0), chip->start);
 		/* FIXME - should have reset delay before continuing */
 
@@ -2508,7 +2517,7 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
 	struct cfi_private *cfi = map->fldrv_priv;
 	unsigned long timeo = jiffies + HZ;
 	DECLARE_WAITQUEUE(wait, current);
-	int ret = 0;
+	int ret;
 	int retry_cnt = 0;
 
 	adr += chip->start;
@@ -2564,8 +2573,11 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
 			chip->erase_suspended = 0;
 		}
 
-		if (chip_good(map, chip, adr, map_word_ff(map)))
+		if (chip_good(map, chip, adr, map_word_ff(map))) {
+			if (cfi_check_err_status(map, chip, adr))
+				ret = -EIO;
 			break;
+		}
 
 		if (time_after(jiffies, timeo)) {
 			printk(KERN_WARNING "MTD %s(): software timeout\n",
@@ -2580,7 +2592,6 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
 	/* Did we succeed? */
 	if (ret) {
 		/* reset on all failures. */
-		cfi_check_err_status(map, chip, adr);
 		map_write(map, CMD(0xF0), chip->start);
 		/* FIXME - should have reset delay before continuing */
 
diff --git a/drivers/mtd/chips/cfi_cmdset_0020.c b/drivers/mtd/chips/cfi_cmdset_0020.c
index e752067526a5..54edae63b92d 100644
--- a/drivers/mtd/chips/cfi_cmdset_0020.c
+++ b/drivers/mtd/chips/cfi_cmdset_0020.c
@@ -611,7 +611,7 @@ static int cfi_staa_write_buffers (struct mtd_info *mtd, loff_t to,
 	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
 	int wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
-	int ret = 0;
+	int ret;
 	int chipnum;
 	unsigned long ofs;
 
@@ -895,7 +895,7 @@ static int cfi_staa_erase_varsize(struct mtd_info *mtd,
 {	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
 	unsigned long adr, len;
-	int chipnum, ret = 0;
+	int chipnum, ret;
 	int i, first;
 	struct mtd_erase_region_info *regions = mtd->eraseregions;
 
@@ -1132,7 +1132,7 @@ static int cfi_staa_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
 	unsigned long adr;
-	int chipnum, ret = 0;
+	int chipnum, ret;
 #ifdef DEBUG_LOCK_BITS
 	int ofs_factor = cfi->interleave * cfi->device_type;
 #endif
@@ -1279,7 +1279,7 @@ static int cfi_staa_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
 	unsigned long adr;
-	int chipnum, ret = 0;
+	int chipnum, ret;
 #ifdef DEBUG_LOCK_BITS
 	int ofs_factor = cfi->interleave * cfi->device_type;
 #endif
diff --git a/drivers/mtd/chips/cfi_util.c b/drivers/mtd/chips/cfi_util.c
index e3b266ee06af..e2d4db05aeb3 100644
--- a/drivers/mtd/chips/cfi_util.c
+++ b/drivers/mtd/chips/cfi_util.c
@@ -26,7 +26,7 @@
 void cfi_udelay(int us)
 {
 	if (us >= 1000) {
-		msleep((us+999)/1000);
+		msleep(DIV_ROUND_UP(us, 1000));
 	} else {
 		udelay(us);
 		cond_resched();
diff --git a/drivers/mtd/devices/mchp23k256.c b/drivers/mtd/devices/mchp23k256.c
index b20d02b4f830..77c872fd3d83 100644
--- a/drivers/mtd/devices/mchp23k256.c
+++ b/drivers/mtd/devices/mchp23k256.c
@@ -64,15 +64,17 @@ static int mchp23k256_write(struct mtd_info *mtd, loff_t to, size_t len,
 	struct spi_transfer transfer[2] = {};
 	struct spi_message message;
 	unsigned char command[MAX_CMD_SIZE];
-	int ret;
+	int ret, cmd_len;
 
 	spi_message_init(&message);
 
+	cmd_len = mchp23k256_cmdsz(flash);
+
 	command[0] = MCHP23K256_CMD_WRITE;
 	mchp23k256_addr2cmd(flash, to, command);
 
 	transfer[0].tx_buf = command;
-	transfer[0].len = mchp23k256_cmdsz(flash);
+	transfer[0].len = cmd_len;
 	spi_message_add_tail(&transfer[0], &message);
 
 	transfer[1].tx_buf = buf;
@@ -88,8 +90,8 @@ static int mchp23k256_write(struct mtd_info *mtd, loff_t to, size_t len,
 	if (ret)
 		return ret;
 
-	if (retlen && message.actual_length > sizeof(command))
-		*retlen += message.actual_length - sizeof(command);
+	if (retlen && message.actual_length > cmd_len)
+		*retlen += message.actual_length - cmd_len;
 
 	return 0;
 }
@@ -101,16 +103,18 @@ static int mchp23k256_read(struct mtd_info *mtd, loff_t from, size_t len,
 	struct spi_transfer transfer[2] = {};
 	struct spi_message message;
 	unsigned char command[MAX_CMD_SIZE];
-	int ret;
+	int ret, cmd_len;
 
 	spi_message_init(&message);
 
+	cmd_len = mchp23k256_cmdsz(flash);
+
 	memset(&transfer, 0, sizeof(transfer));
 	command[0] = MCHP23K256_CMD_READ;
 	mchp23k256_addr2cmd(flash, from, command);
 
 	transfer[0].tx_buf = command;
-	transfer[0].len = mchp23k256_cmdsz(flash);
+	transfer[0].len = cmd_len;
 	spi_message_add_tail(&transfer[0], &message);
 
 	transfer[1].rx_buf = buf;
@@ -126,8 +130,8 @@ static int mchp23k256_read(struct mtd_info *mtd, loff_t from, size_t len,
 	if (ret)
 		return ret;
 
-	if (retlen && message.actual_length > sizeof(command))
-		*retlen += message.actual_length - sizeof(command);
+	if (retlen && message.actual_length > cmd_len)
+		*retlen += message.actual_length - cmd_len;
 
 	return 0;
 }
diff --git a/drivers/mtd/devices/spear_smi.c b/drivers/mtd/devices/spear_smi.c
index 986f81d2f93e..79dcca16481d 100644
--- a/drivers/mtd/devices/spear_smi.c
+++ b/drivers/mtd/devices/spear_smi.c
@@ -592,6 +592,26 @@ static int spear_mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
 	return 0;
 }
 
+/*
+ * The purpose of this function is to ensure a memcpy_toio() with byte writes
+ * only. Its structure is inspired from the ARM implementation of _memcpy_toio()
+ * which also does single byte writes but cannot be used here as this is just an
+ * implementation detail and not part of the API. Not mentioning the comment
+ * stating that _memcpy_toio() should be optimized.
+ */
+static void spear_smi_memcpy_toio_b(volatile void __iomem *dest,
+				    const void *src, size_t len)
+{
+	const unsigned char *from = src;
+
+	while (len) {
+		len--;
+		writeb(*from, dest);
+		from++;
+		dest++;
+	}
+}
+
 static inline int spear_smi_cpy_toio(struct spear_smi *dev, u32 bank,
 		void __iomem *dest, const void *src, size_t len)
 {
@@ -614,7 +634,23 @@ static inline int spear_smi_cpy_toio(struct spear_smi *dev, u32 bank,
 	ctrlreg1 = readl(dev->io_base + SMI_CR1);
 	writel((ctrlreg1 | WB_MODE) & ~SW_MODE, dev->io_base + SMI_CR1);
 
-	memcpy_toio(dest, src, len);
+	/*
+	 * In Write Burst mode (WB_MODE), the specs states that writes must be:
+	 * - incremental
+	 * - of the same size
+	 * The ARM implementation of memcpy_toio() will optimize the number of
+	 * I/O by using as much 4-byte writes as possible, surrounded by
+	 * 2-byte/1-byte access if:
+	 * - the destination is not 4-byte aligned
+	 * - the length is not a multiple of 4-byte.
+	 * Avoid this alternance of write access size by using our own 'byte
+	 * access' helper if at least one of the two conditions above is true.
+	 */
+	if (IS_ALIGNED(len, sizeof(u32)) &&
+	    IS_ALIGNED((uintptr_t)dest, sizeof(u32)))
+		memcpy_toio(dest, src, len);
+	else
+		spear_smi_memcpy_toio_b(dest, src, len);
 
 	writel(ctrlreg1, dev->io_base + SMI_CR1);
 
@@ -777,9 +813,6 @@ static int spear_smi_probe_config_dt(struct platform_device *pdev,
 
 	/* Fill structs for each subnode (flash device) */
 	while ((pp = of_get_next_child(np, pp))) {
-		struct spear_smi_flash_info *flash_info;
-
-		flash_info = &pdata->board_flash_info[i];
 		pdata->np[i] = pp;
 
 		/* Read base-addr and size from DT */
@@ -933,7 +966,6 @@ static int spear_smi_probe(struct platform_device *pdev)
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		ret = -ENODEV;
-		dev_err(&pdev->dev, "invalid smi irq\n");
 		goto err;
 	}
 
diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index f4d1667daaf9..1888523d9745 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -255,7 +255,6 @@ struct stfsm_seq {
 struct stfsm {
 	struct device		*dev;
 	void __iomem		*base;
-	struct resource		*region;
 	struct mtd_info		mtd;
 	struct mutex		lock;
 	struct flash_info       *info;
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index bc82305ebb4c..b28225a7c4f3 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -96,6 +96,17 @@ config MTD_PHYSMAP_GEMINI
 	  platforms, some detection and setting up parallel mode on the
 	  external interface.
 
+config MTD_PHYSMAP_IXP4XX
+	bool "Intel IXP4xx OF-based physical memory map handling"
+	depends on MTD_PHYSMAP_OF
+	depends on ARM
+	select MTD_COMPLEX_MAPPINGS
+	select MTD_CFI_BE_BYTE_SWAP if CPU_BIG_ENDIAN
+	default ARCH_IXP4XX
+	help
+	  This provides some extra DT physmap parsing for the Intel IXP4xx
+	  platforms, some elaborate endianness handling in particular.
+
 config MTD_PHYSMAP_GPIO_ADDR
 	bool "GPIO-assisted Flash Chip Support"
 	depends on MTD_PHYSMAP
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index 1146009f41df..c0da86a5d26f 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_MTD_PXA2XX)	+= pxa2xx-flash.o
 physmap-objs-y			+= physmap-core.o
 physmap-objs-$(CONFIG_MTD_PHYSMAP_VERSATILE) += physmap-versatile.o
 physmap-objs-$(CONFIG_MTD_PHYSMAP_GEMINI) += physmap-gemini.o
+physmap-objs-$(CONFIG_MTD_PHYSMAP_IXP4XX) += physmap-ixp4xx.o
 physmap-objs			:= $(physmap-objs-y)
 obj-$(CONFIG_MTD_PHYSMAP)	+= physmap.o
 obj-$(CONFIG_MTD_PISMO)		+= pismo.o
diff --git a/drivers/mtd/maps/l440gx.c b/drivers/mtd/maps/l440gx.c
index 876f12f40018..0eeadfeb620d 100644
--- a/drivers/mtd/maps/l440gx.c
+++ b/drivers/mtd/maps/l440gx.c
@@ -86,7 +86,7 @@ static int __init init_l440gx(void)
 		return -ENOMEM;
 	}
 	simple_map_init(&l440gx_map);
-	printk(KERN_NOTICE "window_addr = 0x%08lx\n", (unsigned long)l440gx_map.virt);
+	pr_debug("window_addr = %p\n", l440gx_map.virt);
 
 	/* Setup the pm iobase resource
 	 * This code should move into some kind of generic bridge
diff --git a/drivers/mtd/maps/physmap-core.c b/drivers/mtd/maps/physmap-core.c
index 21b556afc305..a9f7964e2edb 100644
--- a/drivers/mtd/maps/physmap-core.c
+++ b/drivers/mtd/maps/physmap-core.c
@@ -41,6 +41,7 @@
 #include <linux/gpio/consumer.h>
 
 #include "physmap-gemini.h"
+#include "physmap-ixp4xx.h"
 #include "physmap-versatile.h"
 
 struct physmap_flash_info {
@@ -370,6 +371,10 @@ static int physmap_flash_of_init(struct platform_device *dev)
 		if (err)
 			return err;
 
+		err = of_flash_probe_ixp4xx(dev, dp, &info->maps[i]);
+		if (err)
+			return err;
+
 		err = of_flash_probe_versatile(dev, dp, &info->maps[i]);
 		if (err)
 			return err;
diff --git a/drivers/mtd/maps/physmap-ixp4xx.c b/drivers/mtd/maps/physmap-ixp4xx.c
new file mode 100644
index 000000000000..6a054229a8a0
--- /dev/null
+++ b/drivers/mtd/maps/physmap-ixp4xx.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel IXP4xx OF physmap add-on
+ * Copyright (C) 2019 Linus Walleij <linus.walleij@linaro.org>
+ *
+ * Based on the ixp4xx.c map driver, originally written by:
+ * Intel Corporation
+ * Deepak Saxena <dsaxena@mvista.com>
+ * Copyright (C) 2002 Intel Corporation
+ * Copyright (C) 2003-2004 MontaVista Software, Inc.
+ */
+#include <linux/export.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/xip.h>
+#include "physmap-ixp4xx.h"
+
+/*
+ * Read/write a 16 bit word from flash address 'addr'.
+ *
+ * When the cpu is in little-endian mode it swizzles the address lines
+ * ('address coherency') so we need to undo the swizzling to ensure commands
+ * and the like end up on the correct flash address.
+ *
+ * To further complicate matters, due to the way the expansion bus controller
+ * handles 32 bit reads, the byte stream ABCD is stored on the flash as:
+ *     D15    D0
+ *     +---+---+
+ *     | A | B | 0
+ *     +---+---+
+ *     | C | D | 2
+ *     +---+---+
+ * This means that on LE systems each 16 bit word must be swapped. Note that
+ * this requires CONFIG_MTD_CFI_BE_BYTE_SWAP to be enabled to 'unswap' the CFI
+ * data and other flash commands which are always in D7-D0.
+ */
+#ifndef CONFIG_CPU_BIG_ENDIAN
+
+static inline u16 flash_read16(void __iomem *addr)
+{
+	return be16_to_cpu(__raw_readw((void __iomem *)((unsigned long)addr ^ 0x2)));
+}
+
+static inline void flash_write16(u16 d, void __iomem *addr)
+{
+	__raw_writew(cpu_to_be16(d), (void __iomem *)((unsigned long)addr ^ 0x2));
+}
+
+#define	BYTE0(h)	((h) & 0xFF)
+#define	BYTE1(h)	(((h) >> 8) & 0xFF)
+
+#else
+
+static inline u16 flash_read16(const void __iomem *addr)
+{
+	return __raw_readw(addr);
+}
+
+static inline void flash_write16(u16 d, void __iomem *addr)
+{
+	__raw_writew(d, addr);
+}
+
+#define	BYTE0(h)	(((h) >> 8) & 0xFF)
+#define	BYTE1(h)	((h) & 0xFF)
+#endif
+
+static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
+{
+	map_word val;
+
+	val.x[0] = flash_read16(map->virt + ofs);
+	return val;
+}
+
+/*
+ * The IXP4xx expansion bus only allows 16-bit wide acceses
+ * when attached to a 16-bit wide device (such as the 28F128J3A),
+ * so we can't just memcpy_fromio().
+ */
+static void ixp4xx_copy_from(struct map_info *map, void *to,
+			     unsigned long from, ssize_t len)
+{
+	u8 *dest = (u8 *) to;
+	void __iomem *src = map->virt + from;
+
+	if (len <= 0)
+		return;
+
+	if (from & 1) {
+		*dest++ = BYTE1(flash_read16(src-1));
+		src++;
+		--len;
+	}
+
+	while (len >= 2) {
+		u16 data = flash_read16(src);
+		*dest++ = BYTE0(data);
+		*dest++ = BYTE1(data);
+		src += 2;
+		len -= 2;
+	}
+
+	if (len > 0)
+		*dest++ = BYTE0(flash_read16(src));
+}
+
+static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
+{
+	flash_write16(d.x[0], map->virt + adr);
+}
+
+int of_flash_probe_ixp4xx(struct platform_device *pdev,
+			  struct device_node *np,
+			  struct map_info *map)
+{
+	struct device *dev = &pdev->dev;
+
+	/* Multiplatform guard */
+	if (!of_device_is_compatible(np, "intel,ixp4xx-flash"))
+		return 0;
+
+	map->read = ixp4xx_read16;
+	map->write = ixp4xx_write16;
+	map->copy_from = ixp4xx_copy_from;
+	map->copy_to = NULL;
+
+	dev_info(dev, "initialized Intel IXP4xx-specific physmap control\n");
+
+	return 0;
+}
diff --git a/drivers/mtd/maps/physmap-ixp4xx.h b/drivers/mtd/maps/physmap-ixp4xx.h
new file mode 100644
index 000000000000..b0fc49b7f3ed
--- /dev/null
+++ b/drivers/mtd/maps/physmap-ixp4xx.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/of.h>
+#include <linux/mtd/map.h>
+
+#ifdef CONFIG_MTD_PHYSMAP_IXP4XX
+int of_flash_probe_ixp4xx(struct platform_device *pdev,
+			  struct device_node *np,
+			  struct map_info *map);
+#else
+static inline
+int of_flash_probe_ixp4xx(struct platform_device *pdev,
+			  struct device_node *np,
+			  struct map_info *map)
+{
+	return 0;
+}
+#endif
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 975aed94f06c..b841008a9eb7 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -174,7 +174,7 @@ static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
 			break;
 		case MTD_FILE_MODE_RAW:
 		{
-			struct mtd_oob_ops ops;
+			struct mtd_oob_ops ops = {};
 
 			ops.mode = MTD_OPS_RAW;
 			ops.datbuf = kbuf;
@@ -268,7 +268,7 @@ static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t c
 
 		case MTD_FILE_MODE_RAW:
 		{
-			struct mtd_oob_ops ops;
+			struct mtd_oob_ops ops = {};
 
 			ops.mode = MTD_OPS_RAW;
 			ops.datbuf = kbuf;
@@ -350,7 +350,7 @@ static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
 	uint32_t __user *retp)
 {
 	struct mtd_file_info *mfi = file->private_data;
-	struct mtd_oob_ops ops;
+	struct mtd_oob_ops ops = {};
 	uint32_t retlen;
 	int ret = 0;
 
@@ -394,7 +394,7 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
 	uint32_t __user *retp)
 {
 	struct mtd_file_info *mfi = file->private_data;
-	struct mtd_oob_ops ops;
+	struct mtd_oob_ops ops = {};
 	int ret = 0;
 
 	if (length > 4096)
@@ -587,7 +587,7 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd,
 		struct mtd_write_req __user *argp)
 {
 	struct mtd_write_req req;
-	struct mtd_oob_ops ops;
+	struct mtd_oob_ops ops = {};
 	const void __user *usr_data, *usr_oob;
 	int ret;
 
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 6cc7ecb0c788..5fac4355b9c2 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -382,33 +382,21 @@ static struct dentry *dfs_dir_mtd;
 static void mtd_debugfs_populate(struct mtd_info *mtd)
 {
 	struct device *dev = &mtd->dev;
-	struct dentry *root, *dent;
+	struct dentry *root;
 
 	if (IS_ERR_OR_NULL(dfs_dir_mtd))
 		return;
 
 	root = debugfs_create_dir(dev_name(dev), dfs_dir_mtd);
-	if (IS_ERR_OR_NULL(root)) {
-		dev_dbg(dev, "won't show data in debugfs\n");
-		return;
-	}
-
 	mtd->dbg.dfs_dir = root;
 
-	if (mtd->dbg.partid) {
-		dent = debugfs_create_file("partid", 0400, root, mtd,
-					   &mtd_partid_debug_fops);
-		if (IS_ERR_OR_NULL(dent))
-			dev_err(dev, "can't create debugfs entry for partid\n");
-	}
+	if (mtd->dbg.partid)
+		debugfs_create_file("partid", 0400, root, mtd,
+				    &mtd_partid_debug_fops);
 
-	if (mtd->dbg.partname) {
-		dent = debugfs_create_file("partname", 0400, root, mtd,
-					   &mtd_partname_debug_fops);
-		if (IS_ERR_OR_NULL(dent))
-			dev_err(dev,
-				"can't create debugfs entry for partname\n");
-	}
+	if (mtd->dbg.partname)
+		debugfs_create_file("partname", 0400, root, mtd,
+				    &mtd_partname_debug_fops);
 }
 
 #ifndef CONFIG_MMU
diff --git a/drivers/mtd/mtdswap.c b/drivers/mtd/mtdswap.c
index f92414eb4c86..58eefa43af14 100644
--- a/drivers/mtd/mtdswap.c
+++ b/drivers/mtd/mtdswap.c
@@ -1257,7 +1257,6 @@ DEFINE_SHOW_ATTRIBUTE(mtdswap);
 static int mtdswap_add_debugfs(struct mtdswap_dev *d)
 {
 	struct dentry *root = d->mtd->dbg.dfs_dir;
-	struct dentry *dent;
 
 	if (!IS_ENABLED(CONFIG_DEBUG_FS))
 		return 0;
@@ -1265,12 +1264,7 @@ static int mtdswap_add_debugfs(struct mtdswap_dev *d)
 	if (IS_ERR_OR_NULL(root))
 		return -1;
 
-	dent = debugfs_create_file("mtdswap_stats", S_IRUSR, root, d,
-				&mtdswap_fops);
-	if (!dent) {
-		dev_err(d->dev, "debugfs_create_file failed\n");
-		return -1;
-	}
+	debugfs_create_file("mtdswap_stats", S_IRUSR, root, d, &mtdswap_fops);
 
 	return 0;
 }
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index e59de3f60cf6..74fb91adeb46 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -450,6 +450,13 @@ config MTD_NAND_PLATFORM
 	  devices. You will need to provide platform-specific functions
 	  via platform_data.
 
+config MTD_NAND_CADENCE
+	tristate "Support Cadence NAND (HPNFC) controller"
+	depends on OF || COMPILE_TEST
+	help
+	  Enable the driver for NAND flash on platforms using a Cadence NAND
+	  controller.
+
 comment "Misc"
 
 config MTD_SM_COMMON
diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
index a98721988e61..2d136b158fb7 100644
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_MTD_NAND_MXIC)		+= mxic_nand.o
 obj-$(CONFIG_MTD_NAND_TEGRA)		+= tegra_nand.o
 obj-$(CONFIG_MTD_NAND_STM32_FMC2)	+= stm32_fmc2_nand.o
 obj-$(CONFIG_MTD_NAND_MESON)		+= meson_nand.o
+obj-$(CONFIG_MTD_NAND_CADENCE)		+= cadence-nand-controller.o
 
 nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o nand_ids.o
 nand-objs += nand_onfi.o
diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
index 15ef30b368a5..1a66b1cd51c0 100644
--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
@@ -117,6 +117,18 @@ enum flash_dma_reg {
 	FLASH_DMA_CURRENT_DESC_EXT,
 };
 
+/* flash_dma registers v0*/
+static const u16 flash_dma_regs_v0[] = {
+	[FLASH_DMA_REVISION]		= 0x00,
+	[FLASH_DMA_FIRST_DESC]		= 0x04,
+	[FLASH_DMA_CTRL]		= 0x08,
+	[FLASH_DMA_MODE]		= 0x0c,
+	[FLASH_DMA_STATUS]		= 0x10,
+	[FLASH_DMA_INTERRUPT_DESC]	= 0x14,
+	[FLASH_DMA_ERROR_STATUS]	= 0x18,
+	[FLASH_DMA_CURRENT_DESC]	= 0x1c,
+};
+
 /* flash_dma registers v1*/
 static const u16 flash_dma_regs_v1[] = {
 	[FLASH_DMA_REVISION]		= 0x00,
@@ -597,6 +609,8 @@ static void brcmnand_flash_dma_revision_init(struct brcmnand_controller *ctrl)
 	/* flash_dma register offsets */
 	if (ctrl->nand_version >= 0x0703)
 		ctrl->flash_dma_offsets = flash_dma_regs_v4;
+	else if (ctrl->nand_version == 0x0602)
+		ctrl->flash_dma_offsets = flash_dma_regs_v0;
 	else
 		ctrl->flash_dma_offsets = flash_dma_regs_v1;
 }
@@ -918,7 +932,7 @@ static inline void disable_ctrl_irqs(struct brcmnand_controller *ctrl)
 		return;
 
 	if (has_flash_dma(ctrl)) {
-		ctrl->flash_dma_base = 0;
+		ctrl->flash_dma_base = NULL;
 		disable_irq(ctrl->dma_irq);
 	}
 
@@ -1673,8 +1687,11 @@ static void brcmnand_dma_run(struct brcmnand_host *host, dma_addr_t desc)
 
 	flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC, lower_32_bits(desc));
 	(void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC);
-	flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC_EXT, upper_32_bits(desc));
-	(void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC_EXT);
+	if (ctrl->nand_version > 0x0602) {
+		flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC_EXT,
+				 upper_32_bits(desc));
+		(void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC_EXT);
+	}
 
 	/* Start FLASH_DMA engine */
 	ctrl->dma_pending = true;
diff --git a/drivers/mtd/nand/raw/cadence-nand-controller.c b/drivers/mtd/nand/raw/cadence-nand-controller.c
new file mode 100644
index 000000000000..3a36285a8d8a
--- /dev/null
+++ b/drivers/mtd/nand/raw/cadence-nand-controller.c
@@ -0,0 +1,3030 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Cadence NAND flash controller driver
+ *
+ * Copyright (C) 2019 Cadence
+ *
+ * Author: Piotr Sroka <piotrs@cadence.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/of_device.h>
+#include <linux/iopoll.h>
+
+/*
+ * HPNFC can work in 3 modes:
+ * -  PIO - can work in master or slave DMA
+ * -  CDMA - needs Master DMA for accessing command descriptors.
+ * -  Generic mode - can use only slave DMA.
+ * CDMA and PIO modes can be used to execute only base commands.
+ * Generic mode can be used to execute any command
+ * on NAND flash memory. Driver uses CDMA mode for
+ * block erasing, page reading, page programing.
+ * Generic mode is used for executing rest of commands.
+ */
+
+#define MAX_OOB_SIZE_PER_SECTOR	32
+#define MAX_ADDRESS_CYC		6
+#define MAX_ERASE_ADDRESS_CYC	3
+#define MAX_DATA_SIZE		0xFFFC
+#define DMA_DATA_SIZE_ALIGN	8
+
+/* Register definition. */
+/*
+ * Command register 0.
+ * Writing data to this register will initiate a new transaction
+ * of the NF controller.
+ */
+#define CMD_REG0			0x0000
+/* Command type field mask. */
+#define		CMD_REG0_CT		GENMASK(31, 30)
+/* Command type CDMA. */
+#define		CMD_REG0_CT_CDMA	0uL
+/* Command type generic. */
+#define		CMD_REG0_CT_GEN		3uL
+/* Command thread number field mask. */
+#define		CMD_REG0_TN		GENMASK(27, 24)
+
+/* Command register 2. */
+#define CMD_REG2			0x0008
+/* Command register 3. */
+#define CMD_REG3			0x000C
+/* Pointer register to select which thread status will be selected. */
+#define CMD_STATUS_PTR			0x0010
+/* Command status register for selected thread. */
+#define CMD_STATUS			0x0014
+
+/* Interrupt status register. */
+#define INTR_STATUS			0x0110
+#define		INTR_STATUS_SDMA_ERR	BIT(22)
+#define		INTR_STATUS_SDMA_TRIGG	BIT(21)
+#define		INTR_STATUS_UNSUPP_CMD	BIT(19)
+#define		INTR_STATUS_DDMA_TERR	BIT(18)
+#define		INTR_STATUS_CDMA_TERR	BIT(17)
+#define		INTR_STATUS_CDMA_IDL	BIT(16)
+
+/* Interrupt enable register. */
+#define INTR_ENABLE				0x0114
+#define		INTR_ENABLE_INTR_EN		BIT(31)
+#define		INTR_ENABLE_SDMA_ERR_EN		BIT(22)
+#define		INTR_ENABLE_SDMA_TRIGG_EN	BIT(21)
+#define		INTR_ENABLE_UNSUPP_CMD_EN	BIT(19)
+#define		INTR_ENABLE_DDMA_TERR_EN	BIT(18)
+#define		INTR_ENABLE_CDMA_TERR_EN	BIT(17)
+#define		INTR_ENABLE_CDMA_IDLE_EN	BIT(16)
+
+/* Controller internal state. */
+#define CTRL_STATUS				0x0118
+#define		CTRL_STATUS_INIT_COMP		BIT(9)
+#define		CTRL_STATUS_CTRL_BUSY		BIT(8)
+
+/* Command Engine threads state. */
+#define TRD_STATUS				0x0120
+
+/* Command Engine interrupt thread error status. */
+#define TRD_ERR_INT_STATUS			0x0128
+/* Command Engine interrupt thread error enable. */
+#define TRD_ERR_INT_STATUS_EN			0x0130
+/* Command Engine interrupt thread complete status. */
+#define TRD_COMP_INT_STATUS			0x0138
+
+/*
+ * Transfer config 0 register.
+ * Configures data transfer parameters.
+ */
+#define TRAN_CFG_0				0x0400
+/* Offset value from the beginning of the page. */
+#define		TRAN_CFG_0_OFFSET		GENMASK(31, 16)
+/* Numbers of sectors to transfer within singlNF device's page. */
+#define		TRAN_CFG_0_SEC_CNT		GENMASK(7, 0)
+
+/*
+ * Transfer config 1 register.
+ * Configures data transfer parameters.
+ */
+#define TRAN_CFG_1				0x0404
+/* Size of last data sector. */
+#define		TRAN_CFG_1_LAST_SEC_SIZE	GENMASK(31, 16)
+/* Size of not-last data sector. */
+#define		TRAN_CFG_1_SECTOR_SIZE		GENMASK(15, 0)
+
+/* ECC engine configuration register 0. */
+#define ECC_CONFIG_0				0x0428
+/* Correction strength. */
+#define		ECC_CONFIG_0_CORR_STR		GENMASK(10, 8)
+/* Enable erased pages detection mechanism. */
+#define		ECC_CONFIG_0_ERASE_DET_EN	BIT(1)
+/* Enable controller ECC check bits generation and correction. */
+#define		ECC_CONFIG_0_ECC_EN		BIT(0)
+
+/* ECC engine configuration register 1. */
+#define ECC_CONFIG_1				0x042C
+
+/* Multiplane settings register. */
+#define MULTIPLANE_CFG				0x0434
+/* Cache operation settings. */
+#define CACHE_CFG				0x0438
+
+/* DMA settings register. */
+#define DMA_SETINGS				0x043C
+/* Enable SDMA error report on access unprepared slave DMA interface. */
+#define		DMA_SETINGS_SDMA_ERR_RSP	BIT(17)
+
+/* Transferred data block size for the slave DMA module. */
+#define SDMA_SIZE				0x0440
+
+/* Thread number associated with transferred data block
+ * for the slave DMA module.
+ */
+#define SDMA_TRD_NUM				0x0444
+/* Thread number mask. */
+#define		SDMA_TRD_NUM_SDMA_TRD		GENMASK(2, 0)
+
+#define CONTROL_DATA_CTRL			0x0494
+/* Thread number mask. */
+#define		CONTROL_DATA_CTRL_SIZE		GENMASK(15, 0)
+
+#define CTRL_VERSION				0x800
+#define		CTRL_VERSION_REV		GENMASK(7, 0)
+
+/* Available hardware features of the controller. */
+#define CTRL_FEATURES				0x804
+/* Support for NV-DDR2/3 work mode. */
+#define		CTRL_FEATURES_NVDDR_2_3		BIT(28)
+/* Support for NV-DDR work mode. */
+#define		CTRL_FEATURES_NVDDR		BIT(27)
+/* Support for asynchronous work mode. */
+#define		CTRL_FEATURES_ASYNC		BIT(26)
+/* Support for asynchronous work mode. */
+#define		CTRL_FEATURES_N_BANKS		GENMASK(25, 24)
+/* Slave and Master DMA data width. */
+#define		CTRL_FEATURES_DMA_DWITH64	BIT(21)
+/* Availability of Control Data feature.*/
+#define		CTRL_FEATURES_CONTROL_DATA	BIT(10)
+
+/* BCH Engine identification register 0 - correction strengths. */
+#define BCH_CFG_0				0x838
+#define		BCH_CFG_0_CORR_CAP_0		GENMASK(7, 0)
+#define		BCH_CFG_0_CORR_CAP_1		GENMASK(15, 8)
+#define		BCH_CFG_0_CORR_CAP_2		GENMASK(23, 16)
+#define		BCH_CFG_0_CORR_CAP_3		GENMASK(31, 24)
+
+/* BCH Engine identification register 1 - correction strengths. */
+#define BCH_CFG_1				0x83C
+#define		BCH_CFG_1_CORR_CAP_4		GENMASK(7, 0)
+#define		BCH_CFG_1_CORR_CAP_5		GENMASK(15, 8)
+#define		BCH_CFG_1_CORR_CAP_6		GENMASK(23, 16)
+#define		BCH_CFG_1_CORR_CAP_7		GENMASK(31, 24)
+
+/* BCH Engine identification register 2 - sector sizes. */
+#define BCH_CFG_2				0x840
+#define		BCH_CFG_2_SECT_0		GENMASK(15, 0)
+#define		BCH_CFG_2_SECT_1		GENMASK(31, 16)
+
+/* BCH Engine identification register 3. */
+#define BCH_CFG_3				0x844
+
+/* Ready/Busy# line status. */
+#define RBN_SETINGS				0x1004
+
+/* Common settings. */
+#define COMMON_SET				0x1008
+/* 16 bit device connected to the NAND Flash interface. */
+#define		COMMON_SET_DEVICE_16BIT		BIT(8)
+
+/* Skip_bytes registers. */
+#define SKIP_BYTES_CONF				0x100C
+#define		SKIP_BYTES_MARKER_VALUE		GENMASK(31, 16)
+#define		SKIP_BYTES_NUM_OF_BYTES		GENMASK(7, 0)
+
+#define SKIP_BYTES_OFFSET			0x1010
+#define		 SKIP_BYTES_OFFSET_VALUE	GENMASK(23, 0)
+
+/* Timings configuration. */
+#define ASYNC_TOGGLE_TIMINGS			0x101c
+#define		ASYNC_TOGGLE_TIMINGS_TRH	GENMASK(28, 24)
+#define		ASYNC_TOGGLE_TIMINGS_TRP	GENMASK(20, 16)
+#define		ASYNC_TOGGLE_TIMINGS_TWH	GENMASK(12, 8)
+#define		ASYNC_TOGGLE_TIMINGS_TWP	GENMASK(4, 0)
+
+#define	TIMINGS0				0x1024
+#define		TIMINGS0_TADL			GENMASK(31, 24)
+#define		TIMINGS0_TCCS			GENMASK(23, 16)
+#define		TIMINGS0_TWHR			GENMASK(15, 8)
+#define		TIMINGS0_TRHW			GENMASK(7, 0)
+
+#define	TIMINGS1				0x1028
+#define		TIMINGS1_TRHZ			GENMASK(31, 24)
+#define		TIMINGS1_TWB			GENMASK(23, 16)
+#define		TIMINGS1_TVDLY			GENMASK(7, 0)
+
+#define	TIMINGS2				0x102c
+#define		TIMINGS2_TFEAT			GENMASK(25, 16)
+#define		TIMINGS2_CS_HOLD_TIME		GENMASK(13, 8)
+#define		TIMINGS2_CS_SETUP_TIME		GENMASK(5, 0)
+
+/* Configuration of the resynchronization of slave DLL of PHY. */
+#define DLL_PHY_CTRL				0x1034
+#define		DLL_PHY_CTRL_DLL_RST_N		BIT(24)
+#define		DLL_PHY_CTRL_EXTENDED_WR_MODE	BIT(17)
+#define		DLL_PHY_CTRL_EXTENDED_RD_MODE	BIT(16)
+#define		DLL_PHY_CTRL_RS_HIGH_WAIT_CNT	GENMASK(11, 8)
+#define		DLL_PHY_CTRL_RS_IDLE_CNT	GENMASK(7, 0)
+
+/* Register controlling DQ related timing. */
+#define PHY_DQ_TIMING				0x2000
+/* Register controlling DSQ related timing.  */
+#define PHY_DQS_TIMING				0x2004
+#define		PHY_DQS_TIMING_DQS_SEL_OE_END	GENMASK(3, 0)
+#define		PHY_DQS_TIMING_PHONY_DQS_SEL	BIT(16)
+#define		PHY_DQS_TIMING_USE_PHONY_DQS	BIT(20)
+
+/* Register controlling the gate and loopback control related timing. */
+#define PHY_GATE_LPBK_CTRL			0x2008
+#define		PHY_GATE_LPBK_CTRL_RDS		GENMASK(24, 19)
+
+/* Register holds the control for the master DLL logic. */
+#define PHY_DLL_MASTER_CTRL			0x200C
+#define		PHY_DLL_MASTER_CTRL_BYPASS_MODE	BIT(23)
+
+/* Register holds the control for the slave DLL logic. */
+#define PHY_DLL_SLAVE_CTRL			0x2010
+
+/* This register handles the global control settings for the PHY. */
+#define PHY_CTRL				0x2080
+#define		PHY_CTRL_SDR_DQS		BIT(14)
+#define		PHY_CTRL_PHONY_DQS		GENMASK(9, 4)
+
+/*
+ * This register handles the global control settings
+ * for the termination selects for reads.
+ */
+#define PHY_TSEL				0x2084
+
+/* Generic command layout. */
+#define GCMD_LAY_CS			GENMASK_ULL(11, 8)
+/*
+ * This bit informs the minicotroller if it has to wait for tWB
+ * after sending the last CMD/ADDR/DATA in the sequence.
+ */
+#define GCMD_LAY_TWB			BIT_ULL(6)
+/* Type of generic instruction. */
+#define GCMD_LAY_INSTR			GENMASK_ULL(5, 0)
+
+/* Generic CMD sequence type. */
+#define		GCMD_LAY_INSTR_CMD	0
+/* Generic ADDR sequence type. */
+#define		GCMD_LAY_INSTR_ADDR	1
+/* Generic data transfer sequence type. */
+#define		GCMD_LAY_INSTR_DATA	2
+
+/* Input part of generic command type of input is command. */
+#define GCMD_LAY_INPUT_CMD		GENMASK_ULL(23, 16)
+
+/* Generic command address sequence - address fields. */
+#define GCMD_LAY_INPUT_ADDR		GENMASK_ULL(63, 16)
+/* Generic command address sequence - address size. */
+#define GCMD_LAY_INPUT_ADDR_SIZE	GENMASK_ULL(13, 11)
+
+/* Transfer direction field of generic command data sequence. */
+#define GCMD_DIR			BIT_ULL(11)
+/* Read transfer direction of generic command data sequence. */
+#define		GCMD_DIR_READ		0
+/* Write transfer direction of generic command data sequence. */
+#define		GCMD_DIR_WRITE		1
+
+/* ECC enabled flag of generic command data sequence - ECC enabled. */
+#define GCMD_ECC_EN			BIT_ULL(12)
+/* Generic command data sequence - sector size. */
+#define GCMD_SECT_SIZE			GENMASK_ULL(31, 16)
+/* Generic command data sequence - sector count. */
+#define GCMD_SECT_CNT			GENMASK_ULL(39, 32)
+/* Generic command data sequence - last sector size. */
+#define GCMD_LAST_SIZE			GENMASK_ULL(55, 40)
+
+/* CDMA descriptor fields. */
+/* Erase command type of CDMA descriptor. */
+#define CDMA_CT_ERASE		0x1000
+/* Program page command type of CDMA descriptor. */
+#define CDMA_CT_WR		0x2100
+/* Read page command type of CDMA descriptor. */
+#define CDMA_CT_RD		0x2200
+
+/* Flash pointer memory shift. */
+#define CDMA_CFPTR_MEM_SHIFT	24
+/* Flash pointer memory mask. */
+#define CDMA_CFPTR_MEM		GENMASK(26, 24)
+
+/*
+ * Command DMA descriptor flags. If set causes issue interrupt after
+ * the completion of descriptor processing.
+ */
+#define CDMA_CF_INT		BIT(8)
+/*
+ * Command DMA descriptor flags - the next descriptor
+ * address field is valid and descriptor processing should continue.
+ */
+#define CDMA_CF_CONT		BIT(9)
+/* DMA master flag of command DMA descriptor. */
+#define CDMA_CF_DMA_MASTER	BIT(10)
+
+/* Operation complete status of command descriptor. */
+#define CDMA_CS_COMP		BIT(15)
+/* Operation complete status of command descriptor. */
+/* Command descriptor status - operation fail. */
+#define CDMA_CS_FAIL		BIT(14)
+/* Command descriptor status - page erased. */
+#define CDMA_CS_ERP		BIT(11)
+/* Command descriptor status - timeout occurred. */
+#define CDMA_CS_TOUT		BIT(10)
+/*
+ * Maximum amount of correction applied to one ECC sector.
+ * It is part of command descriptor status.
+ */
+#define CDMA_CS_MAXERR		GENMASK(9, 2)
+/* Command descriptor status - uncorrectable ECC error. */
+#define CDMA_CS_UNCE		BIT(1)
+/* Command descriptor status - descriptor error. */
+#define CDMA_CS_ERR		BIT(0)
+
+/* Status of operation - OK. */
+#define STAT_OK			0
+/* Status of operation - FAIL. */
+#define STAT_FAIL		2
+/* Status of operation - uncorrectable ECC error. */
+#define STAT_ECC_UNCORR		3
+/* Status of operation - page erased. */
+#define STAT_ERASED		5
+/* Status of operation - correctable ECC error. */
+#define STAT_ECC_CORR		6
+/* Status of operation - unsuspected state. */
+#define STAT_UNKNOWN		7
+/* Status of operation - operation is not completed yet. */
+#define STAT_BUSY		0xFF
+
+#define BCH_MAX_NUM_CORR_CAPS		8
+#define BCH_MAX_NUM_SECTOR_SIZES	2
+
+struct cadence_nand_timings {
+	u32 async_toggle_timings;
+	u32 timings0;
+	u32 timings1;
+	u32 timings2;
+	u32 dll_phy_ctrl;
+	u32 phy_ctrl;
+	u32 phy_dqs_timing;
+	u32 phy_gate_lpbk_ctrl;
+};
+
+/* Command DMA descriptor. */
+struct cadence_nand_cdma_desc {
+	/* Next descriptor address. */
+	u64 next_pointer;
+
+	/* Flash address is a 32-bit address comprising of BANK and ROW ADDR. */
+	u32 flash_pointer;
+	/*field appears in HPNFC version 13*/
+	u16 bank;
+	u16 rsvd0;
+
+	/* Operation the controller needs to perform. */
+	u16 command_type;
+	u16 rsvd1;
+	/* Flags for operation of this command. */
+	u16 command_flags;
+	u16 rsvd2;
+
+	/* System/host memory address required for data DMA commands. */
+	u64 memory_pointer;
+
+	/* Status of operation. */
+	u32 status;
+	u32 rsvd3;
+
+	/* Address pointer to sync buffer location. */
+	u64 sync_flag_pointer;
+
+	/* Controls the buffer sync mechanism. */
+	u32 sync_arguments;
+	u32 rsvd4;
+
+	/* Control data pointer. */
+	u64 ctrl_data_ptr;
+};
+
+/* Interrupt status. */
+struct cadence_nand_irq_status {
+	/* Thread operation complete status. */
+	u32 trd_status;
+	/* Thread operation error. */
+	u32 trd_error;
+	/* Controller status. */
+	u32 status;
+};
+
+/* Cadence NAND flash controller capabilities get from driver data. */
+struct cadence_nand_dt_devdata {
+	/* Skew value of the output signals of the NAND Flash interface. */
+	u32 if_skew;
+	/* It informs if slave DMA interface is connected to DMA engine. */
+	unsigned int has_dma:1;
+};
+
+/* Cadence NAND flash controller capabilities read from registers. */
+struct cdns_nand_caps {
+	/* Maximum number of banks supported by hardware. */
+	u8 max_banks;
+	/* Slave and Master DMA data width in bytes (4 or 8). */
+	u8 data_dma_width;
+	/* Control Data feature supported. */
+	bool data_control_supp;
+	/* Is PHY type DLL. */
+	bool is_phy_type_dll;
+};
+
+struct cdns_nand_ctrl {
+	struct device *dev;
+	struct nand_controller controller;
+	struct cadence_nand_cdma_desc *cdma_desc;
+	/* IP capability. */
+	const struct cadence_nand_dt_devdata *caps1;
+	struct cdns_nand_caps caps2;
+	u8 ctrl_rev;
+	dma_addr_t dma_cdma_desc;
+	u8 *buf;
+	u32 buf_size;
+	u8 curr_corr_str_idx;
+
+	/* Register interface. */
+	void __iomem *reg;
+
+	struct {
+		void __iomem *virt;
+		dma_addr_t dma;
+	} io;
+
+	int irq;
+	/* Interrupts that have happened. */
+	struct cadence_nand_irq_status irq_status;
+	/* Interrupts we are waiting for. */
+	struct cadence_nand_irq_status irq_mask;
+	struct completion complete;
+	/* Protect irq_mask and irq_status. */
+	spinlock_t irq_lock;
+
+	int ecc_strengths[BCH_MAX_NUM_CORR_CAPS];
+	struct nand_ecc_step_info ecc_stepinfos[BCH_MAX_NUM_SECTOR_SIZES];
+	struct nand_ecc_caps ecc_caps;
+
+	int curr_trans_type;
+
+	struct dma_chan *dmac;
+
+	u32 nf_clk_rate;
+	/*
+	 * Estimated Board delay. The value includes the total
+	 * round trip delay for the signals and is used for deciding on values
+	 * associated with data read capture.
+	 */
+	u32 board_delay;
+
+	struct nand_chip *selected_chip;
+
+	unsigned long assigned_cs;
+	struct list_head chips;
+};
+
+struct cdns_nand_chip {
+	struct cadence_nand_timings timings;
+	struct nand_chip chip;
+	u8 nsels;
+	struct list_head node;
+
+	/*
+	 * part of oob area of NAND flash memory page.
+	 * This part is available for user to read or write.
+	 */
+	u32 avail_oob_size;
+
+	/* Sector size. There are few sectors per mtd->writesize */
+	u32 sector_size;
+	u32 sector_count;
+
+	/* Offset of BBM. */
+	u8 bbm_offs;
+	/* Number of bytes reserved for BBM. */
+	u8 bbm_len;
+	/* ECC strength index. */
+	u8 corr_str_idx;
+
+	u8 cs[];
+};
+
+struct ecc_info {
+	int (*calc_ecc_bytes)(int step_size, int strength);
+	int max_step_size;
+};
+
+static inline struct
+cdns_nand_chip *to_cdns_nand_chip(struct nand_chip *chip)
+{
+	return container_of(chip, struct cdns_nand_chip, chip);
+}
+
+static inline struct
+cdns_nand_ctrl *to_cdns_nand_ctrl(struct nand_controller *controller)
+{
+	return container_of(controller, struct cdns_nand_ctrl, controller);
+}
+
+static bool
+cadence_nand_dma_buf_ok(struct cdns_nand_ctrl *cdns_ctrl, const void *buf,
+			u32 buf_len)
+{
+	u8 data_dma_width = cdns_ctrl->caps2.data_dma_width;
+
+	return buf && virt_addr_valid(buf) &&
+		likely(IS_ALIGNED((uintptr_t)buf, data_dma_width)) &&
+		likely(IS_ALIGNED(buf_len, DMA_DATA_SIZE_ALIGN));
+}
+
+static int cadence_nand_wait_for_value(struct cdns_nand_ctrl *cdns_ctrl,
+				       u32 reg_offset, u32 timeout_us,
+				       u32 mask, bool is_clear)
+{
+	u32 val;
+	int ret;
+
+	ret = readl_relaxed_poll_timeout(cdns_ctrl->reg + reg_offset,
+					 val, !(val & mask) == is_clear,
+					 10, timeout_us);
+
+	if (ret < 0) {
+		dev_err(cdns_ctrl->dev,
+			"Timeout while waiting for reg %x with mask %x is clear %d\n",
+			reg_offset, mask, is_clear);
+	}
+
+	return ret;
+}
+
+static int cadence_nand_set_ecc_enable(struct cdns_nand_ctrl *cdns_ctrl,
+				       bool enable)
+{
+	u32 reg;
+
+	if (cadence_nand_wait_for_value(cdns_ctrl, CTRL_STATUS,
+					1000000,
+					CTRL_STATUS_CTRL_BUSY, true))
+		return -ETIMEDOUT;
+
+	reg = readl_relaxed(cdns_ctrl->reg + ECC_CONFIG_0);
+
+	if (enable)
+		reg |= ECC_CONFIG_0_ECC_EN;
+	else
+		reg &= ~ECC_CONFIG_0_ECC_EN;
+
+	writel_relaxed(reg, cdns_ctrl->reg + ECC_CONFIG_0);
+
+	return 0;
+}
+
+static void cadence_nand_set_ecc_strength(struct cdns_nand_ctrl *cdns_ctrl,
+					  u8 corr_str_idx)
+{
+	u32 reg;
+
+	if (cdns_ctrl->curr_corr_str_idx == corr_str_idx)
+		return;
+
+	reg = readl_relaxed(cdns_ctrl->reg + ECC_CONFIG_0);
+	reg &= ~ECC_CONFIG_0_CORR_STR;
+	reg |= FIELD_PREP(ECC_CONFIG_0_CORR_STR, corr_str_idx);
+	writel_relaxed(reg, cdns_ctrl->reg + ECC_CONFIG_0);
+
+	cdns_ctrl->curr_corr_str_idx = corr_str_idx;
+}
+
+static int cadence_nand_get_ecc_strength_idx(struct cdns_nand_ctrl *cdns_ctrl,
+					     u8 strength)
+{
+	int i, corr_str_idx = -1;
+
+	for (i = 0; i < BCH_MAX_NUM_CORR_CAPS; i++) {
+		if (cdns_ctrl->ecc_strengths[i] == strength) {
+			corr_str_idx = i;
+			break;
+		}
+	}
+
+	return corr_str_idx;
+}
+
+static int cadence_nand_set_skip_marker_val(struct cdns_nand_ctrl *cdns_ctrl,
+					    u16 marker_value)
+{
+	u32 reg;
+
+	if (cadence_nand_wait_for_value(cdns_ctrl, CTRL_STATUS,
+					1000000,
+					CTRL_STATUS_CTRL_BUSY, true))
+		return -ETIMEDOUT;
+
+	reg = readl_relaxed(cdns_ctrl->reg + SKIP_BYTES_CONF);
+	reg &= ~SKIP_BYTES_MARKER_VALUE;
+	reg |= FIELD_PREP(SKIP_BYTES_MARKER_VALUE,
+			  marker_value);
+
+	writel_relaxed(reg, cdns_ctrl->reg + SKIP_BYTES_CONF);
+
+	return 0;
+}
+
+static int cadence_nand_set_skip_bytes_conf(struct cdns_nand_ctrl *cdns_ctrl,
+					    u8 num_of_bytes,
+					    u32 offset_value,
+					    int enable)
+{
+	u32 reg, skip_bytes_offset;
+
+	if (cadence_nand_wait_for_value(cdns_ctrl, CTRL_STATUS,
+					1000000,
+					CTRL_STATUS_CTRL_BUSY, true))
+		return -ETIMEDOUT;
+
+	if (!enable) {
+		num_of_bytes = 0;
+		offset_value = 0;
+	}
+
+	reg = readl_relaxed(cdns_ctrl->reg + SKIP_BYTES_CONF);
+	reg &= ~SKIP_BYTES_NUM_OF_BYTES;
+	reg |= FIELD_PREP(SKIP_BYTES_NUM_OF_BYTES,
+			  num_of_bytes);
+	skip_bytes_offset = FIELD_PREP(SKIP_BYTES_OFFSET_VALUE,
+				       offset_value);
+
+	writel_relaxed(reg, cdns_ctrl->reg + SKIP_BYTES_CONF);
+	writel_relaxed(skip_bytes_offset, cdns_ctrl->reg + SKIP_BYTES_OFFSET);
+
+	return 0;
+}
+
+/* Functions enables/disables hardware detection of erased data */
+static void cadence_nand_set_erase_detection(struct cdns_nand_ctrl *cdns_ctrl,
+					     bool enable,
+					     u8 bitflips_threshold)
+{
+	u32 reg;
+
+	reg = readl_relaxed(cdns_ctrl->reg + ECC_CONFIG_0);
+
+	if (enable)
+		reg |= ECC_CONFIG_0_ERASE_DET_EN;
+	else
+		reg &= ~ECC_CONFIG_0_ERASE_DET_EN;
+
+	writel_relaxed(reg, cdns_ctrl->reg + ECC_CONFIG_0);
+	writel_relaxed(bitflips_threshold, cdns_ctrl->reg + ECC_CONFIG_1);
+}
+
+static int cadence_nand_set_access_width16(struct cdns_nand_ctrl *cdns_ctrl,
+					   bool bit_bus16)
+{
+	u32 reg;
+
+	if (cadence_nand_wait_for_value(cdns_ctrl, CTRL_STATUS,
+					1000000,
+					CTRL_STATUS_CTRL_BUSY, true))
+		return -ETIMEDOUT;
+
+	reg = readl_relaxed(cdns_ctrl->reg + COMMON_SET);
+
+	if (!bit_bus16)
+		reg &= ~COMMON_SET_DEVICE_16BIT;
+	else
+		reg |= COMMON_SET_DEVICE_16BIT;
+	writel_relaxed(reg, cdns_ctrl->reg + COMMON_SET);
+
+	return 0;
+}
+
+static void
+cadence_nand_clear_interrupt(struct cdns_nand_ctrl *cdns_ctrl,
+			     struct cadence_nand_irq_status *irq_status)
+{
+	writel_relaxed(irq_status->status, cdns_ctrl->reg + INTR_STATUS);
+	writel_relaxed(irq_status->trd_status,
+		       cdns_ctrl->reg + TRD_COMP_INT_STATUS);
+	writel_relaxed(irq_status->trd_error,
+		       cdns_ctrl->reg + TRD_ERR_INT_STATUS);
+}
+
+static void
+cadence_nand_read_int_status(struct cdns_nand_ctrl *cdns_ctrl,
+			     struct cadence_nand_irq_status *irq_status)
+{
+	irq_status->status = readl_relaxed(cdns_ctrl->reg + INTR_STATUS);
+	irq_status->trd_status = readl_relaxed(cdns_ctrl->reg
+					       + TRD_COMP_INT_STATUS);
+	irq_status->trd_error = readl_relaxed(cdns_ctrl->reg
+					      + TRD_ERR_INT_STATUS);
+}
+
+static u32 irq_detected(struct cdns_nand_ctrl *cdns_ctrl,
+			struct cadence_nand_irq_status *irq_status)
+{
+	cadence_nand_read_int_status(cdns_ctrl, irq_status);
+
+	return irq_status->status || irq_status->trd_status ||
+		irq_status->trd_error;
+}
+
+static void cadence_nand_reset_irq(struct cdns_nand_ctrl *cdns_ctrl)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cdns_ctrl->irq_lock, flags);
+	memset(&cdns_ctrl->irq_status, 0, sizeof(cdns_ctrl->irq_status));
+	memset(&cdns_ctrl->irq_mask, 0, sizeof(cdns_ctrl->irq_mask));
+	spin_unlock_irqrestore(&cdns_ctrl->irq_lock, flags);
+}
+
+/*
+ * This is the interrupt service routine. It handles all interrupts
+ * sent to this device.
+ */
+static irqreturn_t cadence_nand_isr(int irq, void *dev_id)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = dev_id;
+	struct cadence_nand_irq_status irq_status;
+	irqreturn_t result = IRQ_NONE;
+
+	spin_lock(&cdns_ctrl->irq_lock);
+
+	if (irq_detected(cdns_ctrl, &irq_status)) {
+		/* Handle interrupt. */
+		/* First acknowledge it. */
+		cadence_nand_clear_interrupt(cdns_ctrl, &irq_status);
+		/* Status in the device context for someone to read. */
+		cdns_ctrl->irq_status.status |= irq_status.status;
+		cdns_ctrl->irq_status.trd_status |= irq_status.trd_status;
+		cdns_ctrl->irq_status.trd_error |= irq_status.trd_error;
+		/* Notify anyone who cares that it happened. */
+		complete(&cdns_ctrl->complete);
+		/* Tell the OS that we've handled this. */
+		result = IRQ_HANDLED;
+	}
+	spin_unlock(&cdns_ctrl->irq_lock);
+
+	return result;
+}
+
+static void cadence_nand_set_irq_mask(struct cdns_nand_ctrl *cdns_ctrl,
+				      struct cadence_nand_irq_status *irq_mask)
+{
+	writel_relaxed(INTR_ENABLE_INTR_EN | irq_mask->status,
+		       cdns_ctrl->reg + INTR_ENABLE);
+
+	writel_relaxed(irq_mask->trd_error,
+		       cdns_ctrl->reg + TRD_ERR_INT_STATUS_EN);
+}
+
+static void
+cadence_nand_wait_for_irq(struct cdns_nand_ctrl *cdns_ctrl,
+			  struct cadence_nand_irq_status *irq_mask,
+			  struct cadence_nand_irq_status *irq_status)
+{
+	unsigned long timeout = msecs_to_jiffies(10000);
+	unsigned long time_left;
+
+	time_left = wait_for_completion_timeout(&cdns_ctrl->complete,
+						timeout);
+
+	*irq_status = cdns_ctrl->irq_status;
+	if (time_left == 0) {
+		/* Timeout error. */
+		dev_err(cdns_ctrl->dev, "timeout occurred:\n");
+		dev_err(cdns_ctrl->dev, "\tstatus = 0x%x, mask = 0x%x\n",
+			irq_status->status, irq_mask->status);
+		dev_err(cdns_ctrl->dev,
+			"\ttrd_status = 0x%x, trd_status mask = 0x%x\n",
+			irq_status->trd_status, irq_mask->trd_status);
+		dev_err(cdns_ctrl->dev,
+			"\t trd_error = 0x%x, trd_error mask = 0x%x\n",
+			irq_status->trd_error, irq_mask->trd_error);
+	}
+}
+
+/* Execute generic command on NAND controller. */
+static int cadence_nand_generic_cmd_send(struct cdns_nand_ctrl *cdns_ctrl,
+					 u8 chip_nr,
+					 u64 mini_ctrl_cmd)
+{
+	u32 mini_ctrl_cmd_l, mini_ctrl_cmd_h, reg;
+
+	mini_ctrl_cmd |= FIELD_PREP(GCMD_LAY_CS, chip_nr);
+	mini_ctrl_cmd_l = mini_ctrl_cmd & 0xFFFFFFFF;
+	mini_ctrl_cmd_h = mini_ctrl_cmd >> 32;
+
+	if (cadence_nand_wait_for_value(cdns_ctrl, CTRL_STATUS,
+					1000000,
+					CTRL_STATUS_CTRL_BUSY, true))
+		return -ETIMEDOUT;
+
+	cadence_nand_reset_irq(cdns_ctrl);
+
+	writel_relaxed(mini_ctrl_cmd_l, cdns_ctrl->reg + CMD_REG2);
+	writel_relaxed(mini_ctrl_cmd_h, cdns_ctrl->reg + CMD_REG3);
+
+	/* Select generic command. */
+	reg = FIELD_PREP(CMD_REG0_CT, CMD_REG0_CT_GEN);
+	/* Thread number. */
+	reg |= FIELD_PREP(CMD_REG0_TN, 0);
+
+	/* Issue command. */
+	writel_relaxed(reg, cdns_ctrl->reg + CMD_REG0);
+
+	return 0;
+}
+
+/* Wait for data on slave DMA interface. */
+static int cadence_nand_wait_on_sdma(struct cdns_nand_ctrl *cdns_ctrl,
+				     u8 *out_sdma_trd,
+				     u32 *out_sdma_size)
+{
+	struct cadence_nand_irq_status irq_mask, irq_status;
+
+	irq_mask.trd_status = 0;
+	irq_mask.trd_error = 0;
+	irq_mask.status = INTR_STATUS_SDMA_TRIGG
+		| INTR_STATUS_SDMA_ERR
+		| INTR_STATUS_UNSUPP_CMD;
+
+	cadence_nand_set_irq_mask(cdns_ctrl, &irq_mask);
+	cadence_nand_wait_for_irq(cdns_ctrl, &irq_mask, &irq_status);
+	if (irq_status.status == 0) {
+		dev_err(cdns_ctrl->dev, "Timeout while waiting for SDMA\n");
+		return -ETIMEDOUT;
+	}
+
+	if (irq_status.status & INTR_STATUS_SDMA_TRIGG) {
+		*out_sdma_size = readl_relaxed(cdns_ctrl->reg + SDMA_SIZE);
+		*out_sdma_trd  = readl_relaxed(cdns_ctrl->reg + SDMA_TRD_NUM);
+		*out_sdma_trd =
+			FIELD_GET(SDMA_TRD_NUM_SDMA_TRD, *out_sdma_trd);
+	} else {
+		dev_err(cdns_ctrl->dev, "SDMA error - irq_status %x\n",
+			irq_status.status);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void cadence_nand_get_caps(struct cdns_nand_ctrl *cdns_ctrl)
+{
+	u32  reg;
+
+	reg = readl_relaxed(cdns_ctrl->reg + CTRL_FEATURES);
+
+	cdns_ctrl->caps2.max_banks = 1 << FIELD_GET(CTRL_FEATURES_N_BANKS, reg);
+
+	if (FIELD_GET(CTRL_FEATURES_DMA_DWITH64, reg))
+		cdns_ctrl->caps2.data_dma_width = 8;
+	else
+		cdns_ctrl->caps2.data_dma_width = 4;
+
+	if (reg & CTRL_FEATURES_CONTROL_DATA)
+		cdns_ctrl->caps2.data_control_supp = true;
+
+	if (reg & (CTRL_FEATURES_NVDDR_2_3
+		   | CTRL_FEATURES_NVDDR))
+		cdns_ctrl->caps2.is_phy_type_dll = true;
+}
+
+/* Prepare CDMA descriptor. */
+static void
+cadence_nand_cdma_desc_prepare(struct cdns_nand_ctrl *cdns_ctrl,
+			       char nf_mem, u32 flash_ptr, char *mem_ptr,
+			       char *ctrl_data_ptr, u16 ctype)
+{
+	struct cadence_nand_cdma_desc *cdma_desc = cdns_ctrl->cdma_desc;
+
+	memset(cdma_desc, 0, sizeof(struct cadence_nand_cdma_desc));
+
+	/* Set fields for one descriptor. */
+	cdma_desc->flash_pointer = flash_ptr;
+	if (cdns_ctrl->ctrl_rev >= 13)
+		cdma_desc->bank = nf_mem;
+	else
+		cdma_desc->flash_pointer |= (nf_mem << CDMA_CFPTR_MEM_SHIFT);
+
+	cdma_desc->command_flags |= CDMA_CF_DMA_MASTER;
+	cdma_desc->command_flags  |= CDMA_CF_INT;
+
+	cdma_desc->memory_pointer = (uintptr_t)mem_ptr;
+	cdma_desc->status = 0;
+	cdma_desc->sync_flag_pointer = 0;
+	cdma_desc->sync_arguments = 0;
+
+	cdma_desc->command_type = ctype;
+	cdma_desc->ctrl_data_ptr = (uintptr_t)ctrl_data_ptr;
+}
+
+static u8 cadence_nand_check_desc_error(struct cdns_nand_ctrl *cdns_ctrl,
+					u32 desc_status)
+{
+	if (desc_status & CDMA_CS_ERP)
+		return STAT_ERASED;
+
+	if (desc_status & CDMA_CS_UNCE)
+		return STAT_ECC_UNCORR;
+
+	if (desc_status & CDMA_CS_ERR) {
+		dev_err(cdns_ctrl->dev, ":CDMA desc error flag detected.\n");
+		return STAT_FAIL;
+	}
+
+	if (FIELD_GET(CDMA_CS_MAXERR, desc_status))
+		return STAT_ECC_CORR;
+
+	return STAT_FAIL;
+}
+
+static int cadence_nand_cdma_finish(struct cdns_nand_ctrl *cdns_ctrl)
+{
+	struct cadence_nand_cdma_desc *desc_ptr = cdns_ctrl->cdma_desc;
+	u8 status = STAT_BUSY;
+
+	if (desc_ptr->status & CDMA_CS_FAIL) {
+		status = cadence_nand_check_desc_error(cdns_ctrl,
+						       desc_ptr->status);
+		dev_err(cdns_ctrl->dev, ":CDMA error %x\n", desc_ptr->status);
+	} else if (desc_ptr->status & CDMA_CS_COMP) {
+		/* Descriptor finished with no errors. */
+		if (desc_ptr->command_flags & CDMA_CF_CONT) {
+			dev_info(cdns_ctrl->dev, "DMA unsupported flag is set");
+			status = STAT_UNKNOWN;
+		} else {
+			/* Last descriptor.  */
+			status = STAT_OK;
+		}
+	}
+
+	return status;
+}
+
+static int cadence_nand_cdma_send(struct cdns_nand_ctrl *cdns_ctrl,
+				  u8 thread)
+{
+	u32 reg;
+	int status;
+
+	/* Wait for thread ready. */
+	status = cadence_nand_wait_for_value(cdns_ctrl, TRD_STATUS,
+					     1000000,
+					     BIT(thread), true);
+	if (status)
+		return status;
+
+	cadence_nand_reset_irq(cdns_ctrl);
+
+	writel_relaxed((u32)cdns_ctrl->dma_cdma_desc,
+		       cdns_ctrl->reg + CMD_REG2);
+	writel_relaxed(0, cdns_ctrl->reg + CMD_REG3);
+
+	/* Select CDMA mode. */
+	reg = FIELD_PREP(CMD_REG0_CT, CMD_REG0_CT_CDMA);
+	/* Thread number. */
+	reg |= FIELD_PREP(CMD_REG0_TN, thread);
+	/* Issue command. */
+	writel_relaxed(reg, cdns_ctrl->reg + CMD_REG0);
+
+	return 0;
+}
+
+/* Send SDMA command and wait for finish. */
+static u32
+cadence_nand_cdma_send_and_wait(struct cdns_nand_ctrl *cdns_ctrl,
+				u8 thread)
+{
+	struct cadence_nand_irq_status irq_mask, irq_status = {0};
+	int status;
+
+	irq_mask.trd_status = BIT(thread);
+	irq_mask.trd_error = BIT(thread);
+	irq_mask.status = INTR_STATUS_CDMA_TERR;
+
+	cadence_nand_set_irq_mask(cdns_ctrl, &irq_mask);
+
+	status = cadence_nand_cdma_send(cdns_ctrl, thread);
+	if (status)
+		return status;
+
+	cadence_nand_wait_for_irq(cdns_ctrl, &irq_mask, &irq_status);
+
+	if (irq_status.status == 0 && irq_status.trd_status == 0 &&
+	    irq_status.trd_error == 0) {
+		dev_err(cdns_ctrl->dev, "CDMA command timeout\n");
+		return -ETIMEDOUT;
+	}
+	if (irq_status.status & irq_mask.status) {
+		dev_err(cdns_ctrl->dev, "CDMA command failed\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/*
+ * ECC size depends on configured ECC strength and on maximum supported
+ * ECC step size.
+ */
+static int cadence_nand_calc_ecc_bytes(int max_step_size, int strength)
+{
+	int nbytes = DIV_ROUND_UP(fls(8 * max_step_size) * strength, 8);
+
+	return ALIGN(nbytes, 2);
+}
+
+#define CADENCE_NAND_CALC_ECC_BYTES(max_step_size) \
+	static int \
+	cadence_nand_calc_ecc_bytes_##max_step_size(int step_size, \
+						    int strength)\
+	{\
+		return cadence_nand_calc_ecc_bytes(max_step_size, strength);\
+	}
+
+CADENCE_NAND_CALC_ECC_BYTES(256)
+CADENCE_NAND_CALC_ECC_BYTES(512)
+CADENCE_NAND_CALC_ECC_BYTES(1024)
+CADENCE_NAND_CALC_ECC_BYTES(2048)
+CADENCE_NAND_CALC_ECC_BYTES(4096)
+
+/* Function reads BCH capabilities. */
+static int cadence_nand_read_bch_caps(struct cdns_nand_ctrl *cdns_ctrl)
+{
+	struct nand_ecc_caps *ecc_caps = &cdns_ctrl->ecc_caps;
+	int max_step_size = 0, nstrengths, i;
+	u32 reg;
+
+	reg = readl_relaxed(cdns_ctrl->reg + BCH_CFG_0);
+	cdns_ctrl->ecc_strengths[0] = FIELD_GET(BCH_CFG_0_CORR_CAP_0, reg);
+	cdns_ctrl->ecc_strengths[1] = FIELD_GET(BCH_CFG_0_CORR_CAP_1, reg);
+	cdns_ctrl->ecc_strengths[2] = FIELD_GET(BCH_CFG_0_CORR_CAP_2, reg);
+	cdns_ctrl->ecc_strengths[3] = FIELD_GET(BCH_CFG_0_CORR_CAP_3, reg);
+
+	reg = readl_relaxed(cdns_ctrl->reg + BCH_CFG_1);
+	cdns_ctrl->ecc_strengths[4] = FIELD_GET(BCH_CFG_1_CORR_CAP_4, reg);
+	cdns_ctrl->ecc_strengths[5] = FIELD_GET(BCH_CFG_1_CORR_CAP_5, reg);
+	cdns_ctrl->ecc_strengths[6] = FIELD_GET(BCH_CFG_1_CORR_CAP_6, reg);
+	cdns_ctrl->ecc_strengths[7] = FIELD_GET(BCH_CFG_1_CORR_CAP_7, reg);
+
+	reg = readl_relaxed(cdns_ctrl->reg + BCH_CFG_2);
+	cdns_ctrl->ecc_stepinfos[0].stepsize =
+		FIELD_GET(BCH_CFG_2_SECT_0, reg);
+
+	cdns_ctrl->ecc_stepinfos[1].stepsize =
+		FIELD_GET(BCH_CFG_2_SECT_1, reg);
+
+	nstrengths = 0;
+	for (i = 0; i < BCH_MAX_NUM_CORR_CAPS; i++) {
+		if (cdns_ctrl->ecc_strengths[i] != 0)
+			nstrengths++;
+	}
+
+	ecc_caps->nstepinfos = 0;
+	for (i = 0; i < BCH_MAX_NUM_SECTOR_SIZES; i++) {
+		/* ECC strengths are common for all step infos. */
+		cdns_ctrl->ecc_stepinfos[i].nstrengths = nstrengths;
+		cdns_ctrl->ecc_stepinfos[i].strengths =
+			cdns_ctrl->ecc_strengths;
+
+		if (cdns_ctrl->ecc_stepinfos[i].stepsize != 0)
+			ecc_caps->nstepinfos++;
+
+		if (cdns_ctrl->ecc_stepinfos[i].stepsize > max_step_size)
+			max_step_size = cdns_ctrl->ecc_stepinfos[i].stepsize;
+	}
+	ecc_caps->stepinfos = &cdns_ctrl->ecc_stepinfos[0];
+
+	switch (max_step_size) {
+	case 256:
+		ecc_caps->calc_ecc_bytes = &cadence_nand_calc_ecc_bytes_256;
+		break;
+	case 512:
+		ecc_caps->calc_ecc_bytes = &cadence_nand_calc_ecc_bytes_512;
+		break;
+	case 1024:
+		ecc_caps->calc_ecc_bytes = &cadence_nand_calc_ecc_bytes_1024;
+		break;
+	case 2048:
+		ecc_caps->calc_ecc_bytes = &cadence_nand_calc_ecc_bytes_2048;
+		break;
+	case 4096:
+		ecc_caps->calc_ecc_bytes = &cadence_nand_calc_ecc_bytes_4096;
+		break;
+	default:
+		dev_err(cdns_ctrl->dev,
+			"Unsupported sector size(ecc step size) %d\n",
+			max_step_size);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/* Hardware initialization. */
+static int cadence_nand_hw_init(struct cdns_nand_ctrl *cdns_ctrl)
+{
+	int status;
+	u32 reg;
+
+	status = cadence_nand_wait_for_value(cdns_ctrl, CTRL_STATUS,
+					     1000000,
+					     CTRL_STATUS_INIT_COMP, false);
+	if (status)
+		return status;
+
+	reg = readl_relaxed(cdns_ctrl->reg + CTRL_VERSION);
+	cdns_ctrl->ctrl_rev = FIELD_GET(CTRL_VERSION_REV, reg);
+
+	dev_info(cdns_ctrl->dev,
+		 "%s: cadence nand controller version reg %x\n",
+		 __func__, reg);
+
+	/* Disable cache and multiplane. */
+	writel_relaxed(0, cdns_ctrl->reg + MULTIPLANE_CFG);
+	writel_relaxed(0, cdns_ctrl->reg + CACHE_CFG);
+
+	/* Clear all interrupts. */
+	writel_relaxed(0xFFFFFFFF, cdns_ctrl->reg + INTR_STATUS);
+
+	cadence_nand_get_caps(cdns_ctrl);
+	cadence_nand_read_bch_caps(cdns_ctrl);
+
+	/*
+	 * Set IO width access to 8.
+	 * It is because during SW device discovering width access
+	 * is expected to be 8.
+	 */
+	status = cadence_nand_set_access_width16(cdns_ctrl, false);
+
+	return status;
+}
+
+#define TT_MAIN_OOB_AREAS	2
+#define TT_RAW_PAGE		3
+#define TT_BBM			4
+#define TT_MAIN_OOB_AREA_EXT	5
+
+/* Prepare size of data to transfer. */
+static void
+cadence_nand_prepare_data_size(struct nand_chip *chip,
+			       int transfer_type)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	u32 sec_size = 0, offset = 0, sec_cnt = 1;
+	u32 last_sec_size = cdns_chip->sector_size;
+	u32 data_ctrl_size = 0;
+	u32 reg = 0;
+
+	if (cdns_ctrl->curr_trans_type == transfer_type)
+		return;
+
+	switch (transfer_type) {
+	case TT_MAIN_OOB_AREA_EXT:
+		sec_cnt = cdns_chip->sector_count;
+		sec_size = cdns_chip->sector_size;
+		data_ctrl_size = cdns_chip->avail_oob_size;
+		break;
+	case TT_MAIN_OOB_AREAS:
+		sec_cnt = cdns_chip->sector_count;
+		last_sec_size = cdns_chip->sector_size
+			+ cdns_chip->avail_oob_size;
+		sec_size = cdns_chip->sector_size;
+		break;
+	case TT_RAW_PAGE:
+		last_sec_size = mtd->writesize + mtd->oobsize;
+		break;
+	case TT_BBM:
+		offset = mtd->writesize + cdns_chip->bbm_offs;
+		last_sec_size = 8;
+		break;
+	}
+
+	reg = 0;
+	reg |= FIELD_PREP(TRAN_CFG_0_OFFSET, offset);
+	reg |= FIELD_PREP(TRAN_CFG_0_SEC_CNT, sec_cnt);
+	writel_relaxed(reg, cdns_ctrl->reg + TRAN_CFG_0);
+
+	reg = 0;
+	reg |= FIELD_PREP(TRAN_CFG_1_LAST_SEC_SIZE, last_sec_size);
+	reg |= FIELD_PREP(TRAN_CFG_1_SECTOR_SIZE, sec_size);
+	writel_relaxed(reg, cdns_ctrl->reg + TRAN_CFG_1);
+
+	if (cdns_ctrl->caps2.data_control_supp) {
+		reg = readl_relaxed(cdns_ctrl->reg + CONTROL_DATA_CTRL);
+		reg &= ~CONTROL_DATA_CTRL_SIZE;
+		reg |= FIELD_PREP(CONTROL_DATA_CTRL_SIZE, data_ctrl_size);
+		writel_relaxed(reg, cdns_ctrl->reg + CONTROL_DATA_CTRL);
+	}
+
+	cdns_ctrl->curr_trans_type = transfer_type;
+}
+
+static int
+cadence_nand_cdma_transfer(struct cdns_nand_ctrl *cdns_ctrl, u8 chip_nr,
+			   int page, void *buf, void *ctrl_dat, u32 buf_size,
+			   u32 ctrl_dat_size, enum dma_data_direction dir,
+			   bool with_ecc)
+{
+	dma_addr_t dma_buf, dma_ctrl_dat = 0;
+	u8 thread_nr = chip_nr;
+	int status;
+	u16 ctype;
+
+	if (dir == DMA_FROM_DEVICE)
+		ctype = CDMA_CT_RD;
+	else
+		ctype = CDMA_CT_WR;
+
+	cadence_nand_set_ecc_enable(cdns_ctrl, with_ecc);
+
+	dma_buf = dma_map_single(cdns_ctrl->dev, buf, buf_size, dir);
+	if (dma_mapping_error(cdns_ctrl->dev, dma_buf)) {
+		dev_err(cdns_ctrl->dev, "Failed to map DMA buffer\n");
+		return -EIO;
+	}
+
+	if (ctrl_dat && ctrl_dat_size) {
+		dma_ctrl_dat = dma_map_single(cdns_ctrl->dev, ctrl_dat,
+					      ctrl_dat_size, dir);
+		if (dma_mapping_error(cdns_ctrl->dev, dma_ctrl_dat)) {
+			dma_unmap_single(cdns_ctrl->dev, dma_buf,
+					 buf_size, dir);
+			dev_err(cdns_ctrl->dev, "Failed to map DMA buffer\n");
+			return -EIO;
+		}
+	}
+
+	cadence_nand_cdma_desc_prepare(cdns_ctrl, chip_nr, page,
+				       (void *)dma_buf, (void *)dma_ctrl_dat,
+				       ctype);
+
+	status = cadence_nand_cdma_send_and_wait(cdns_ctrl, thread_nr);
+
+	dma_unmap_single(cdns_ctrl->dev, dma_buf,
+			 buf_size, dir);
+
+	if (ctrl_dat && ctrl_dat_size)
+		dma_unmap_single(cdns_ctrl->dev, dma_ctrl_dat,
+				 ctrl_dat_size, dir);
+	if (status)
+		return status;
+
+	return cadence_nand_cdma_finish(cdns_ctrl);
+}
+
+static void cadence_nand_set_timings(struct cdns_nand_ctrl *cdns_ctrl,
+				     struct cadence_nand_timings *t)
+{
+	writel_relaxed(t->async_toggle_timings,
+		       cdns_ctrl->reg + ASYNC_TOGGLE_TIMINGS);
+	writel_relaxed(t->timings0, cdns_ctrl->reg + TIMINGS0);
+	writel_relaxed(t->timings1, cdns_ctrl->reg + TIMINGS1);
+	writel_relaxed(t->timings2, cdns_ctrl->reg + TIMINGS2);
+
+	if (cdns_ctrl->caps2.is_phy_type_dll)
+		writel_relaxed(t->dll_phy_ctrl, cdns_ctrl->reg + DLL_PHY_CTRL);
+
+	writel_relaxed(t->phy_ctrl, cdns_ctrl->reg + PHY_CTRL);
+
+	if (cdns_ctrl->caps2.is_phy_type_dll) {
+		writel_relaxed(0, cdns_ctrl->reg + PHY_TSEL);
+		writel_relaxed(2, cdns_ctrl->reg + PHY_DQ_TIMING);
+		writel_relaxed(t->phy_dqs_timing,
+			       cdns_ctrl->reg + PHY_DQS_TIMING);
+		writel_relaxed(t->phy_gate_lpbk_ctrl,
+			       cdns_ctrl->reg + PHY_GATE_LPBK_CTRL);
+		writel_relaxed(PHY_DLL_MASTER_CTRL_BYPASS_MODE,
+			       cdns_ctrl->reg + PHY_DLL_MASTER_CTRL);
+		writel_relaxed(0, cdns_ctrl->reg + PHY_DLL_SLAVE_CTRL);
+	}
+}
+
+static int cadence_nand_select_target(struct nand_chip *chip)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+
+	if (chip == cdns_ctrl->selected_chip)
+		return 0;
+
+	if (cadence_nand_wait_for_value(cdns_ctrl, CTRL_STATUS,
+					1000000,
+					CTRL_STATUS_CTRL_BUSY, true))
+		return -ETIMEDOUT;
+
+	cadence_nand_set_timings(cdns_ctrl, &cdns_chip->timings);
+
+	cadence_nand_set_ecc_strength(cdns_ctrl,
+				      cdns_chip->corr_str_idx);
+
+	cadence_nand_set_erase_detection(cdns_ctrl, true,
+					 chip->ecc.strength);
+
+	cdns_ctrl->curr_trans_type = -1;
+	cdns_ctrl->selected_chip = chip;
+
+	return 0;
+}
+
+static int cadence_nand_erase(struct nand_chip *chip, u32 page)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	int status;
+	u8 thread_nr = cdns_chip->cs[chip->cur_cs];
+
+	cadence_nand_cdma_desc_prepare(cdns_ctrl,
+				       cdns_chip->cs[chip->cur_cs],
+				       page, NULL, NULL,
+				       CDMA_CT_ERASE);
+	status = cadence_nand_cdma_send_and_wait(cdns_ctrl, thread_nr);
+	if (status) {
+		dev_err(cdns_ctrl->dev, "erase operation failed\n");
+		return -EIO;
+	}
+
+	status = cadence_nand_cdma_finish(cdns_ctrl);
+	if (status)
+		return status;
+
+	return 0;
+}
+
+static int cadence_nand_read_bbm(struct nand_chip *chip, int page, u8 *buf)
+{
+	int status;
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	cadence_nand_prepare_data_size(chip, TT_BBM);
+
+	cadence_nand_set_skip_bytes_conf(cdns_ctrl, 0, 0, 0);
+
+	/*
+	 * Read only bad block marker from offset
+	 * defined by a memory manufacturer.
+	 */
+	status = cadence_nand_cdma_transfer(cdns_ctrl,
+					    cdns_chip->cs[chip->cur_cs],
+					    page, cdns_ctrl->buf, NULL,
+					    mtd->oobsize,
+					    0, DMA_FROM_DEVICE, false);
+	if (status) {
+		dev_err(cdns_ctrl->dev, "read BBM failed\n");
+		return -EIO;
+	}
+
+	memcpy(buf + cdns_chip->bbm_offs, cdns_ctrl->buf, cdns_chip->bbm_len);
+
+	return 0;
+}
+
+static int cadence_nand_write_page(struct nand_chip *chip,
+				   const u8 *buf, int oob_required,
+				   int page)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	int status;
+	u16 marker_val = 0xFFFF;
+
+	status = cadence_nand_select_target(chip);
+	if (status)
+		return status;
+
+	cadence_nand_set_skip_bytes_conf(cdns_ctrl, cdns_chip->bbm_len,
+					 mtd->writesize
+					 + cdns_chip->bbm_offs,
+					 1);
+
+	if (oob_required) {
+		marker_val = *(u16 *)(chip->oob_poi
+				      + cdns_chip->bbm_offs);
+	} else {
+		/* Set oob data to 0xFF. */
+		memset(cdns_ctrl->buf + mtd->writesize, 0xFF,
+		       cdns_chip->avail_oob_size);
+	}
+
+	cadence_nand_set_skip_marker_val(cdns_ctrl, marker_val);
+
+	cadence_nand_prepare_data_size(chip, TT_MAIN_OOB_AREA_EXT);
+
+	if (cadence_nand_dma_buf_ok(cdns_ctrl, buf, mtd->writesize) &&
+	    cdns_ctrl->caps2.data_control_supp) {
+		u8 *oob;
+
+		if (oob_required)
+			oob = chip->oob_poi;
+		else
+			oob = cdns_ctrl->buf + mtd->writesize;
+
+		status = cadence_nand_cdma_transfer(cdns_ctrl,
+						    cdns_chip->cs[chip->cur_cs],
+						    page, (void *)buf, oob,
+						    mtd->writesize,
+						    cdns_chip->avail_oob_size,
+						    DMA_TO_DEVICE, true);
+		if (status) {
+			dev_err(cdns_ctrl->dev, "write page failed\n");
+			return -EIO;
+		}
+
+		return 0;
+	}
+
+	if (oob_required) {
+		/* Transfer the data to the oob area. */
+		memcpy(cdns_ctrl->buf + mtd->writesize, chip->oob_poi,
+		       cdns_chip->avail_oob_size);
+	}
+
+	memcpy(cdns_ctrl->buf, buf, mtd->writesize);
+
+	cadence_nand_prepare_data_size(chip, TT_MAIN_OOB_AREAS);
+
+	return cadence_nand_cdma_transfer(cdns_ctrl,
+					  cdns_chip->cs[chip->cur_cs],
+					  page, cdns_ctrl->buf, NULL,
+					  mtd->writesize
+					  + cdns_chip->avail_oob_size,
+					  0, DMA_TO_DEVICE, true);
+}
+
+static int cadence_nand_write_oob(struct nand_chip *chip, int page)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	memset(cdns_ctrl->buf, 0xFF, mtd->writesize);
+
+	return cadence_nand_write_page(chip, cdns_ctrl->buf, 1, page);
+}
+
+static int cadence_nand_write_page_raw(struct nand_chip *chip,
+				       const u8 *buf, int oob_required,
+				       int page)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	int writesize = mtd->writesize;
+	int oobsize = mtd->oobsize;
+	int ecc_steps = chip->ecc.steps;
+	int ecc_size = chip->ecc.size;
+	int ecc_bytes = chip->ecc.bytes;
+	void *tmp_buf = cdns_ctrl->buf;
+	int oob_skip = cdns_chip->bbm_len;
+	size_t size = writesize + oobsize;
+	int i, pos, len;
+	int status = 0;
+
+	status = cadence_nand_select_target(chip);
+	if (status)
+		return status;
+
+	/*
+	 * Fill the buffer with 0xff first except the full page transfer.
+	 * This simplifies the logic.
+	 */
+	if (!buf || !oob_required)
+		memset(tmp_buf, 0xff, size);
+
+	cadence_nand_set_skip_bytes_conf(cdns_ctrl, 0, 0, 0);
+
+	/* Arrange the buffer for syndrome payload/ecc layout. */
+	if (buf) {
+		for (i = 0; i < ecc_steps; i++) {
+			pos = i * (ecc_size + ecc_bytes);
+			len = ecc_size;
+
+			if (pos >= writesize)
+				pos += oob_skip;
+			else if (pos + len > writesize)
+				len = writesize - pos;
+
+			memcpy(tmp_buf + pos, buf, len);
+			buf += len;
+			if (len < ecc_size) {
+				len = ecc_size - len;
+				memcpy(tmp_buf + writesize + oob_skip, buf,
+				       len);
+				buf += len;
+			}
+		}
+	}
+
+	if (oob_required) {
+		const u8 *oob = chip->oob_poi;
+		u32 oob_data_offset = (cdns_chip->sector_count - 1) *
+			(cdns_chip->sector_size + chip->ecc.bytes)
+			+ cdns_chip->sector_size + oob_skip;
+
+		/* BBM at the beginning of the OOB area. */
+		memcpy(tmp_buf + writesize, oob, oob_skip);
+
+		/* OOB free. */
+		memcpy(tmp_buf + oob_data_offset, oob,
+		       cdns_chip->avail_oob_size);
+		oob += cdns_chip->avail_oob_size;
+
+		/* OOB ECC. */
+		for (i = 0; i < ecc_steps; i++) {
+			pos = ecc_size + i * (ecc_size + ecc_bytes);
+			if (i == (ecc_steps - 1))
+				pos += cdns_chip->avail_oob_size;
+
+			len = ecc_bytes;
+
+			if (pos >= writesize)
+				pos += oob_skip;
+			else if (pos + len > writesize)
+				len = writesize - pos;
+
+			memcpy(tmp_buf + pos, oob, len);
+			oob += len;
+			if (len < ecc_bytes) {
+				len = ecc_bytes - len;
+				memcpy(tmp_buf + writesize + oob_skip, oob,
+				       len);
+				oob += len;
+			}
+		}
+	}
+
+	cadence_nand_prepare_data_size(chip, TT_RAW_PAGE);
+
+	return cadence_nand_cdma_transfer(cdns_ctrl,
+					  cdns_chip->cs[chip->cur_cs],
+					  page, cdns_ctrl->buf, NULL,
+					  mtd->writesize +
+					  mtd->oobsize,
+					  0, DMA_TO_DEVICE, false);
+}
+
+static int cadence_nand_write_oob_raw(struct nand_chip *chip,
+				      int page)
+{
+	return cadence_nand_write_page_raw(chip, NULL, true, page);
+}
+
+static int cadence_nand_read_page(struct nand_chip *chip,
+				  u8 *buf, int oob_required, int page)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	int status = 0;
+	int ecc_err_count = 0;
+
+	status = cadence_nand_select_target(chip);
+	if (status)
+		return status;
+
+	cadence_nand_set_skip_bytes_conf(cdns_ctrl, cdns_chip->bbm_len,
+					 mtd->writesize
+					 + cdns_chip->bbm_offs, 1);
+
+	/*
+	 * If data buffer can be accessed by DMA and data_control feature
+	 * is supported then transfer data and oob directly.
+	 */
+	if (cadence_nand_dma_buf_ok(cdns_ctrl, buf, mtd->writesize) &&
+	    cdns_ctrl->caps2.data_control_supp) {
+		u8 *oob;
+
+		if (oob_required)
+			oob = chip->oob_poi;
+		else
+			oob = cdns_ctrl->buf + mtd->writesize;
+
+		cadence_nand_prepare_data_size(chip, TT_MAIN_OOB_AREA_EXT);
+		status = cadence_nand_cdma_transfer(cdns_ctrl,
+						    cdns_chip->cs[chip->cur_cs],
+						    page, buf, oob,
+						    mtd->writesize,
+						    cdns_chip->avail_oob_size,
+						    DMA_FROM_DEVICE, true);
+	/* Otherwise use bounce buffer. */
+	} else {
+		cadence_nand_prepare_data_size(chip, TT_MAIN_OOB_AREAS);
+		status = cadence_nand_cdma_transfer(cdns_ctrl,
+						    cdns_chip->cs[chip->cur_cs],
+						    page, cdns_ctrl->buf,
+						    NULL, mtd->writesize
+						    + cdns_chip->avail_oob_size,
+						    0, DMA_FROM_DEVICE, true);
+
+		memcpy(buf, cdns_ctrl->buf, mtd->writesize);
+		if (oob_required)
+			memcpy(chip->oob_poi,
+			       cdns_ctrl->buf + mtd->writesize,
+			       mtd->oobsize);
+	}
+
+	switch (status) {
+	case STAT_ECC_UNCORR:
+		mtd->ecc_stats.failed++;
+		ecc_err_count++;
+		break;
+	case STAT_ECC_CORR:
+		ecc_err_count = FIELD_GET(CDMA_CS_MAXERR,
+					  cdns_ctrl->cdma_desc->status);
+		mtd->ecc_stats.corrected += ecc_err_count;
+		break;
+	case STAT_ERASED:
+	case STAT_OK:
+		break;
+	default:
+		dev_err(cdns_ctrl->dev, "read page failed\n");
+		return -EIO;
+	}
+
+	if (oob_required)
+		if (cadence_nand_read_bbm(chip, page, chip->oob_poi))
+			return -EIO;
+
+	return ecc_err_count;
+}
+
+/* Reads OOB data from the device. */
+static int cadence_nand_read_oob(struct nand_chip *chip, int page)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+
+	return cadence_nand_read_page(chip, cdns_ctrl->buf, 1, page);
+}
+
+static int cadence_nand_read_page_raw(struct nand_chip *chip,
+				      u8 *buf, int oob_required, int page)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	int oob_skip = cdns_chip->bbm_len;
+	int writesize = mtd->writesize;
+	int ecc_steps = chip->ecc.steps;
+	int ecc_size = chip->ecc.size;
+	int ecc_bytes = chip->ecc.bytes;
+	void *tmp_buf = cdns_ctrl->buf;
+	int i, pos, len;
+	int status = 0;
+
+	status = cadence_nand_select_target(chip);
+	if (status)
+		return status;
+
+	cadence_nand_set_skip_bytes_conf(cdns_ctrl, 0, 0, 0);
+
+	cadence_nand_prepare_data_size(chip, TT_RAW_PAGE);
+	status = cadence_nand_cdma_transfer(cdns_ctrl,
+					    cdns_chip->cs[chip->cur_cs],
+					    page, cdns_ctrl->buf, NULL,
+					    mtd->writesize
+					    + mtd->oobsize,
+					    0, DMA_FROM_DEVICE, false);
+
+	switch (status) {
+	case STAT_ERASED:
+	case STAT_OK:
+		break;
+	default:
+		dev_err(cdns_ctrl->dev, "read raw page failed\n");
+		return -EIO;
+	}
+
+	/* Arrange the buffer for syndrome payload/ecc layout. */
+	if (buf) {
+		for (i = 0; i < ecc_steps; i++) {
+			pos = i * (ecc_size + ecc_bytes);
+			len = ecc_size;
+
+			if (pos >= writesize)
+				pos += oob_skip;
+			else if (pos + len > writesize)
+				len = writesize - pos;
+
+			memcpy(buf, tmp_buf + pos, len);
+			buf += len;
+			if (len < ecc_size) {
+				len = ecc_size - len;
+				memcpy(buf, tmp_buf + writesize + oob_skip,
+				       len);
+				buf += len;
+			}
+		}
+	}
+
+	if (oob_required) {
+		u8 *oob = chip->oob_poi;
+		u32 oob_data_offset = (cdns_chip->sector_count - 1) *
+			(cdns_chip->sector_size + chip->ecc.bytes)
+			+ cdns_chip->sector_size + oob_skip;
+
+		/* OOB free. */
+		memcpy(oob, tmp_buf + oob_data_offset,
+		       cdns_chip->avail_oob_size);
+
+		/* BBM at the beginning of the OOB area. */
+		memcpy(oob, tmp_buf + writesize, oob_skip);
+
+		oob += cdns_chip->avail_oob_size;
+
+		/* OOB ECC */
+		for (i = 0; i < ecc_steps; i++) {
+			pos = ecc_size + i * (ecc_size + ecc_bytes);
+			len = ecc_bytes;
+
+			if (i == (ecc_steps - 1))
+				pos += cdns_chip->avail_oob_size;
+
+			if (pos >= writesize)
+				pos += oob_skip;
+			else if (pos + len > writesize)
+				len = writesize - pos;
+
+			memcpy(oob, tmp_buf + pos, len);
+			oob += len;
+			if (len < ecc_bytes) {
+				len = ecc_bytes - len;
+				memcpy(oob, tmp_buf + writesize + oob_skip,
+				       len);
+				oob += len;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int cadence_nand_read_oob_raw(struct nand_chip *chip,
+				     int page)
+{
+	return cadence_nand_read_page_raw(chip, NULL, true, page);
+}
+
+static void cadence_nand_slave_dma_transfer_finished(void *data)
+{
+	struct completion *finished = data;
+
+	complete(finished);
+}
+
+static int cadence_nand_slave_dma_transfer(struct cdns_nand_ctrl *cdns_ctrl,
+					   void *buf,
+					   dma_addr_t dev_dma, size_t len,
+					   enum dma_data_direction dir)
+{
+	DECLARE_COMPLETION_ONSTACK(finished);
+	struct dma_chan *chan;
+	struct dma_device *dma_dev;
+	dma_addr_t src_dma, dst_dma, buf_dma;
+	struct dma_async_tx_descriptor *tx;
+	dma_cookie_t cookie;
+
+	chan = cdns_ctrl->dmac;
+	dma_dev = chan->device;
+
+	buf_dma = dma_map_single(dma_dev->dev, buf, len, dir);
+	if (dma_mapping_error(dma_dev->dev, buf_dma)) {
+		dev_err(cdns_ctrl->dev, "Failed to map DMA buffer\n");
+		goto err;
+	}
+
+	if (dir == DMA_FROM_DEVICE) {
+		src_dma = cdns_ctrl->io.dma;
+		dst_dma = buf_dma;
+	} else {
+		src_dma = buf_dma;
+		dst_dma = cdns_ctrl->io.dma;
+	}
+
+	tx = dmaengine_prep_dma_memcpy(cdns_ctrl->dmac, dst_dma, src_dma, len,
+				       DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
+	if (!tx) {
+		dev_err(cdns_ctrl->dev, "Failed to prepare DMA memcpy\n");
+		goto err_unmap;
+	}
+
+	tx->callback = cadence_nand_slave_dma_transfer_finished;
+	tx->callback_param = &finished;
+
+	cookie = dmaengine_submit(tx);
+	if (dma_submit_error(cookie)) {
+		dev_err(cdns_ctrl->dev, "Failed to do DMA tx_submit\n");
+		goto err_unmap;
+	}
+
+	dma_async_issue_pending(cdns_ctrl->dmac);
+	wait_for_completion(&finished);
+
+	dma_unmap_single(cdns_ctrl->dev, buf_dma, len, dir);
+
+	return 0;
+
+err_unmap:
+	dma_unmap_single(cdns_ctrl->dev, buf_dma, len, dir);
+
+err:
+	dev_dbg(cdns_ctrl->dev, "Fall back to CPU I/O\n");
+
+	return -EIO;
+}
+
+static int cadence_nand_read_buf(struct cdns_nand_ctrl *cdns_ctrl,
+				 u8 *buf, int len)
+{
+	u8 thread_nr = 0;
+	u32 sdma_size;
+	int status;
+
+	/* Wait until slave DMA interface is ready to data transfer. */
+	status = cadence_nand_wait_on_sdma(cdns_ctrl, &thread_nr, &sdma_size);
+	if (status)
+		return status;
+
+	if (!cdns_ctrl->caps1->has_dma) {
+		int len_in_words = len >> 2;
+
+		/* read alingment data */
+		ioread32_rep(cdns_ctrl->io.virt, buf, len_in_words);
+		if (sdma_size > len) {
+			/* read rest data from slave DMA interface if any */
+			ioread32_rep(cdns_ctrl->io.virt, cdns_ctrl->buf,
+				     sdma_size / 4 - len_in_words);
+			/* copy rest of data */
+			memcpy(buf + (len_in_words << 2), cdns_ctrl->buf,
+			       len - (len_in_words << 2));
+		}
+		return 0;
+	}
+
+	if (cadence_nand_dma_buf_ok(cdns_ctrl, buf, len)) {
+		status = cadence_nand_slave_dma_transfer(cdns_ctrl, buf,
+							 cdns_ctrl->io.dma,
+							 len, DMA_FROM_DEVICE);
+		if (status == 0)
+			return 0;
+
+		dev_warn(cdns_ctrl->dev,
+			 "Slave DMA transfer failed. Try again using bounce buffer.");
+	}
+
+	/* If DMA transfer is not possible or failed then use bounce buffer. */
+	status = cadence_nand_slave_dma_transfer(cdns_ctrl, cdns_ctrl->buf,
+						 cdns_ctrl->io.dma,
+						 sdma_size, DMA_FROM_DEVICE);
+
+	if (status) {
+		dev_err(cdns_ctrl->dev, "Slave DMA transfer failed");
+		return status;
+	}
+
+	memcpy(buf, cdns_ctrl->buf, len);
+
+	return 0;
+}
+
+static int cadence_nand_write_buf(struct cdns_nand_ctrl *cdns_ctrl,
+				  const u8 *buf, int len)
+{
+	u8 thread_nr = 0;
+	u32 sdma_size;
+	int status;
+
+	/* Wait until slave DMA interface is ready to data transfer. */
+	status = cadence_nand_wait_on_sdma(cdns_ctrl, &thread_nr, &sdma_size);
+	if (status)
+		return status;
+
+	if (!cdns_ctrl->caps1->has_dma) {
+		int len_in_words = len >> 2;
+
+		iowrite32_rep(cdns_ctrl->io.virt, buf, len_in_words);
+		if (sdma_size > len) {
+			/* copy rest of data */
+			memcpy(cdns_ctrl->buf, buf + (len_in_words << 2),
+			       len - (len_in_words << 2));
+			/* write all expected by nand controller data */
+			iowrite32_rep(cdns_ctrl->io.virt, cdns_ctrl->buf,
+				      sdma_size / 4 - len_in_words);
+		}
+
+		return 0;
+	}
+
+	if (cadence_nand_dma_buf_ok(cdns_ctrl, buf, len)) {
+		status = cadence_nand_slave_dma_transfer(cdns_ctrl, (void *)buf,
+							 cdns_ctrl->io.dma,
+							 len, DMA_TO_DEVICE);
+		if (status == 0)
+			return 0;
+
+		dev_warn(cdns_ctrl->dev,
+			 "Slave DMA transfer failed. Try again using bounce buffer.");
+	}
+
+	/* If DMA transfer is not possible or failed then use bounce buffer. */
+	memcpy(cdns_ctrl->buf, buf, len);
+
+	status = cadence_nand_slave_dma_transfer(cdns_ctrl, cdns_ctrl->buf,
+						 cdns_ctrl->io.dma,
+						 sdma_size, DMA_TO_DEVICE);
+
+	if (status)
+		dev_err(cdns_ctrl->dev, "Slave DMA transfer failed");
+
+	return status;
+}
+
+static int cadence_nand_force_byte_access(struct nand_chip *chip,
+					  bool force_8bit)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	int status;
+
+	/*
+	 * Callers of this function do not verify if the NAND is using a 16-bit
+	 * an 8-bit bus for normal operations, so we need to take care of that
+	 * here by leaving the configuration unchanged if the NAND does not have
+	 * the NAND_BUSWIDTH_16 flag set.
+	 */
+	if (!(chip->options & NAND_BUSWIDTH_16))
+		return 0;
+
+	status = cadence_nand_set_access_width16(cdns_ctrl, !force_8bit);
+
+	return status;
+}
+
+static int cadence_nand_cmd_opcode(struct nand_chip *chip,
+				   const struct nand_subop *subop)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	const struct nand_op_instr *instr;
+	unsigned int op_id = 0;
+	u64 mini_ctrl_cmd = 0;
+	int ret;
+
+	instr = &subop->instrs[op_id];
+
+	if (instr->delay_ns > 0)
+		mini_ctrl_cmd |= GCMD_LAY_TWB;
+
+	mini_ctrl_cmd |= FIELD_PREP(GCMD_LAY_INSTR,
+				    GCMD_LAY_INSTR_CMD);
+	mini_ctrl_cmd |= FIELD_PREP(GCMD_LAY_INPUT_CMD,
+				    instr->ctx.cmd.opcode);
+
+	ret = cadence_nand_generic_cmd_send(cdns_ctrl,
+					    cdns_chip->cs[chip->cur_cs],
+					    mini_ctrl_cmd);
+	if (ret)
+		dev_err(cdns_ctrl->dev, "send cmd %x failed\n",
+			instr->ctx.cmd.opcode);
+
+	return ret;
+}
+
+static int cadence_nand_cmd_address(struct nand_chip *chip,
+				    const struct nand_subop *subop)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	const struct nand_op_instr *instr;
+	unsigned int op_id = 0;
+	u64 mini_ctrl_cmd = 0;
+	unsigned int offset, naddrs;
+	u64 address = 0;
+	const u8 *addrs;
+	int ret;
+	int i;
+
+	instr = &subop->instrs[op_id];
+
+	if (instr->delay_ns > 0)
+		mini_ctrl_cmd |= GCMD_LAY_TWB;
+
+	mini_ctrl_cmd |= FIELD_PREP(GCMD_LAY_INSTR,
+				    GCMD_LAY_INSTR_ADDR);
+
+	offset = nand_subop_get_addr_start_off(subop, op_id);
+	naddrs = nand_subop_get_num_addr_cyc(subop, op_id);
+	addrs = &instr->ctx.addr.addrs[offset];
+
+	for (i = 0; i < naddrs; i++)
+		address |= (u64)addrs[i] << (8 * i);
+
+	mini_ctrl_cmd |= FIELD_PREP(GCMD_LAY_INPUT_ADDR,
+				    address);
+	mini_ctrl_cmd |= FIELD_PREP(GCMD_LAY_INPUT_ADDR_SIZE,
+				    naddrs - 1);
+
+	ret = cadence_nand_generic_cmd_send(cdns_ctrl,
+					    cdns_chip->cs[chip->cur_cs],
+					    mini_ctrl_cmd);
+	if (ret)
+		dev_err(cdns_ctrl->dev, "send address %llx failed\n", address);
+
+	return ret;
+}
+
+static int cadence_nand_cmd_erase(struct nand_chip *chip,
+				  const struct nand_subop *subop)
+{
+	unsigned int op_id;
+
+	if (subop->instrs[0].ctx.cmd.opcode == NAND_CMD_ERASE1) {
+		int i;
+		const struct nand_op_instr *instr = NULL;
+		unsigned int offset, naddrs;
+		const u8 *addrs;
+		u32 page = 0;
+
+		instr = &subop->instrs[1];
+		offset = nand_subop_get_addr_start_off(subop, 1);
+		naddrs = nand_subop_get_num_addr_cyc(subop, 1);
+		addrs = &instr->ctx.addr.addrs[offset];
+
+		for (i = 0; i < naddrs; i++)
+			page |= (u32)addrs[i] << (8 * i);
+
+		return cadence_nand_erase(chip, page);
+	}
+
+	/*
+	 * If it is not an erase operation then handle operation
+	 * by calling exec_op function.
+	 */
+	for (op_id = 0; op_id < subop->ninstrs; op_id++) {
+		int ret;
+		const struct nand_operation nand_op = {
+			.cs = chip->cur_cs,
+			.instrs =  &subop->instrs[op_id],
+			.ninstrs = 1};
+		ret = chip->controller->ops->exec_op(chip, &nand_op, false);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int cadence_nand_cmd_data(struct nand_chip *chip,
+				 const struct nand_subop *subop)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	const struct nand_op_instr *instr;
+	unsigned int offset, op_id = 0;
+	u64 mini_ctrl_cmd = 0;
+	int len = 0;
+	int ret;
+
+	instr = &subop->instrs[op_id];
+
+	if (instr->delay_ns > 0)
+		mini_ctrl_cmd |= GCMD_LAY_TWB;
+
+	mini_ctrl_cmd |= FIELD_PREP(GCMD_LAY_INSTR,
+				    GCMD_LAY_INSTR_DATA);
+
+	if (instr->type == NAND_OP_DATA_OUT_INSTR)
+		mini_ctrl_cmd |= FIELD_PREP(GCMD_DIR,
+					    GCMD_DIR_WRITE);
+
+	len = nand_subop_get_data_len(subop, op_id);
+	offset = nand_subop_get_data_start_off(subop, op_id);
+	mini_ctrl_cmd |= FIELD_PREP(GCMD_SECT_CNT, 1);
+	mini_ctrl_cmd |= FIELD_PREP(GCMD_LAST_SIZE, len);
+	if (instr->ctx.data.force_8bit) {
+		ret = cadence_nand_force_byte_access(chip, true);
+		if (ret) {
+			dev_err(cdns_ctrl->dev,
+				"cannot change byte access generic data cmd failed\n");
+			return ret;
+		}
+	}
+
+	ret = cadence_nand_generic_cmd_send(cdns_ctrl,
+					    cdns_chip->cs[chip->cur_cs],
+					    mini_ctrl_cmd);
+	if (ret) {
+		dev_err(cdns_ctrl->dev, "send generic data cmd failed\n");
+		return ret;
+	}
+
+	if (instr->type == NAND_OP_DATA_IN_INSTR) {
+		void *buf = instr->ctx.data.buf.in + offset;
+
+		ret = cadence_nand_read_buf(cdns_ctrl, buf, len);
+	} else {
+		const void *buf = instr->ctx.data.buf.out + offset;
+
+		ret = cadence_nand_write_buf(cdns_ctrl, buf, len);
+	}
+
+	if (ret) {
+		dev_err(cdns_ctrl->dev, "data transfer failed for generic command\n");
+		return ret;
+	}
+
+	if (instr->ctx.data.force_8bit) {
+		ret = cadence_nand_force_byte_access(chip, false);
+		if (ret) {
+			dev_err(cdns_ctrl->dev,
+				"cannot change byte access generic data cmd failed\n");
+		}
+	}
+
+	return ret;
+}
+
+static int cadence_nand_cmd_waitrdy(struct nand_chip *chip,
+				    const struct nand_subop *subop)
+{
+	int status;
+	unsigned int op_id = 0;
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	const struct nand_op_instr *instr = &subop->instrs[op_id];
+	u32 timeout_us = instr->ctx.waitrdy.timeout_ms * 1000;
+
+	status = cadence_nand_wait_for_value(cdns_ctrl, RBN_SETINGS,
+					     timeout_us,
+					     BIT(cdns_chip->cs[chip->cur_cs]),
+					     false);
+	return status;
+}
+
+static const struct nand_op_parser cadence_nand_op_parser = NAND_OP_PARSER(
+	NAND_OP_PARSER_PATTERN(
+		cadence_nand_cmd_erase,
+		NAND_OP_PARSER_PAT_CMD_ELEM(false),
+		NAND_OP_PARSER_PAT_ADDR_ELEM(false, MAX_ERASE_ADDRESS_CYC),
+		NAND_OP_PARSER_PAT_CMD_ELEM(false),
+		NAND_OP_PARSER_PAT_WAITRDY_ELEM(false)),
+	NAND_OP_PARSER_PATTERN(
+		cadence_nand_cmd_opcode,
+		NAND_OP_PARSER_PAT_CMD_ELEM(false)),
+	NAND_OP_PARSER_PATTERN(
+		cadence_nand_cmd_address,
+		NAND_OP_PARSER_PAT_ADDR_ELEM(false, MAX_ADDRESS_CYC)),
+	NAND_OP_PARSER_PATTERN(
+		cadence_nand_cmd_data,
+		NAND_OP_PARSER_PAT_DATA_IN_ELEM(false, MAX_DATA_SIZE)),
+	NAND_OP_PARSER_PATTERN(
+		cadence_nand_cmd_data,
+		NAND_OP_PARSER_PAT_DATA_OUT_ELEM(false, MAX_DATA_SIZE)),
+	NAND_OP_PARSER_PATTERN(
+		cadence_nand_cmd_waitrdy,
+		NAND_OP_PARSER_PAT_WAITRDY_ELEM(false))
+	);
+
+static int cadence_nand_exec_op(struct nand_chip *chip,
+				const struct nand_operation *op,
+				bool check_only)
+{
+	int status = cadence_nand_select_target(chip);
+
+	if (status)
+		return status;
+
+	return nand_op_parser_exec_op(chip, &cadence_nand_op_parser, op,
+				      check_only);
+}
+
+static int cadence_nand_ooblayout_free(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = cdns_chip->bbm_len;
+	oobregion->length = cdns_chip->avail_oob_size
+		- cdns_chip->bbm_len;
+
+	return 0;
+}
+
+static int cadence_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = cdns_chip->avail_oob_size;
+	oobregion->length = chip->ecc.total;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops cadence_nand_ooblayout_ops = {
+	.free = cadence_nand_ooblayout_free,
+	.ecc = cadence_nand_ooblayout_ecc,
+};
+
+static int calc_cycl(u32 timing, u32 clock)
+{
+	if (timing == 0 || clock == 0)
+		return 0;
+
+	if ((timing % clock) > 0)
+		return timing / clock;
+	else
+		return timing / clock - 1;
+}
+
+/* Calculate max data valid window. */
+static inline u32 calc_tdvw_max(u32 trp_cnt, u32 clk_period, u32 trhoh_min,
+				u32 board_delay_skew_min, u32 ext_mode)
+{
+	if (ext_mode == 0)
+		clk_period /= 2;
+
+	return (trp_cnt + 1) * clk_period + trhoh_min +
+		board_delay_skew_min;
+}
+
+/* Calculate data valid window. */
+static inline u32 calc_tdvw(u32 trp_cnt, u32 clk_period, u32 trhoh_min,
+			    u32 trea_max, u32 ext_mode)
+{
+	if (ext_mode == 0)
+		clk_period /= 2;
+
+	return (trp_cnt + 1) * clk_period + trhoh_min - trea_max;
+}
+
+static int
+cadence_nand_setup_data_interface(struct nand_chip *chip, int chipnr,
+				  const struct nand_data_interface *conf)
+{
+	const struct nand_sdr_timings *sdr;
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	struct cadence_nand_timings *t = &cdns_chip->timings;
+	u32 reg;
+	u32 board_delay = cdns_ctrl->board_delay;
+	u32 clk_period = DIV_ROUND_DOWN_ULL(1000000000000ULL,
+					    cdns_ctrl->nf_clk_rate);
+	u32 tceh_cnt, tcs_cnt, tadl_cnt, tccs_cnt;
+	u32 tfeat_cnt, trhz_cnt, tvdly_cnt;
+	u32 trhw_cnt, twb_cnt, twh_cnt = 0, twhr_cnt;
+	u32 twp_cnt = 0, trp_cnt = 0, trh_cnt = 0;
+	u32 if_skew = cdns_ctrl->caps1->if_skew;
+	u32 board_delay_skew_min = board_delay - if_skew;
+	u32 board_delay_skew_max = board_delay + if_skew;
+	u32 dqs_sampl_res, phony_dqs_mod;
+	u32 tdvw, tdvw_min, tdvw_max;
+	u32 ext_rd_mode, ext_wr_mode;
+	u32 dll_phy_dqs_timing = 0, phony_dqs_timing = 0, rd_del_sel = 0;
+	u32 sampling_point;
+
+	sdr = nand_get_sdr_timings(conf);
+	if (IS_ERR(sdr))
+		return PTR_ERR(sdr);
+
+	memset(t, 0, sizeof(*t));
+	/* Sampling point calculation. */
+
+	if (cdns_ctrl->caps2.is_phy_type_dll)
+		phony_dqs_mod = 2;
+	else
+		phony_dqs_mod = 1;
+
+	dqs_sampl_res = clk_period / phony_dqs_mod;
+
+	tdvw_min = sdr->tREA_max + board_delay_skew_max;
+	/*
+	 * The idea of those calculation is to get the optimum value
+	 * for tRP and tRH timings. If it is NOT possible to sample data
+	 * with optimal tRP/tRH settings, the parameters will be extended.
+	 * If clk_period is 50ns (the lowest value) this condition is met
+	 * for asynchronous timing modes 1, 2, 3, 4 and 5.
+	 * If clk_period is 20ns the condition is met only
+	 * for asynchronous timing mode 5.
+	 */
+	if (sdr->tRC_min <= clk_period &&
+	    sdr->tRP_min <= (clk_period / 2) &&
+	    sdr->tREH_min <= (clk_period / 2)) {
+		/* Performance mode. */
+		ext_rd_mode = 0;
+		tdvw = calc_tdvw(trp_cnt, clk_period, sdr->tRHOH_min,
+				 sdr->tREA_max, ext_rd_mode);
+		tdvw_max = calc_tdvw_max(trp_cnt, clk_period, sdr->tRHOH_min,
+					 board_delay_skew_min,
+					 ext_rd_mode);
+		/*
+		 * Check if data valid window and sampling point can be found
+		 * and is not on the edge (ie. we have hold margin).
+		 * If not extend the tRP timings.
+		 */
+		if (tdvw > 0) {
+			if (tdvw_max <= tdvw_min ||
+			    (tdvw_max % dqs_sampl_res) == 0) {
+				/*
+				 * No valid sampling point so the RE pulse need
+				 * to be widen widening by half clock cycle.
+				 */
+				ext_rd_mode = 1;
+			}
+		} else {
+			/*
+			 * There is no valid window
+			 * to be able to sample data the tRP need to be widen.
+			 * Very safe calculations are performed here.
+			 */
+			trp_cnt = (sdr->tREA_max + board_delay_skew_max
+				   + dqs_sampl_res) / clk_period;
+			ext_rd_mode = 1;
+		}
+
+	} else {
+		/* Extended read mode. */
+		u32 trh;
+
+		ext_rd_mode = 1;
+		trp_cnt = calc_cycl(sdr->tRP_min, clk_period);
+		trh = sdr->tRC_min - ((trp_cnt + 1) * clk_period);
+		if (sdr->tREH_min >= trh)
+			trh_cnt = calc_cycl(sdr->tREH_min, clk_period);
+		else
+			trh_cnt = calc_cycl(trh, clk_period);
+
+		tdvw = calc_tdvw(trp_cnt, clk_period, sdr->tRHOH_min,
+				 sdr->tREA_max, ext_rd_mode);
+		/*
+		 * Check if data valid window and sampling point can be found
+		 * or if it is at the edge check if previous is valid
+		 * - if not extend the tRP timings.
+		 */
+		if (tdvw > 0) {
+			tdvw_max = calc_tdvw_max(trp_cnt, clk_period,
+						 sdr->tRHOH_min,
+						 board_delay_skew_min,
+						 ext_rd_mode);
+
+			if ((((tdvw_max / dqs_sampl_res)
+			      * dqs_sampl_res) <= tdvw_min) ||
+			    (((tdvw_max % dqs_sampl_res) == 0) &&
+			     (((tdvw_max / dqs_sampl_res - 1)
+			       * dqs_sampl_res) <= tdvw_min))) {
+				/*
+				 * Data valid window width is lower than
+				 * sampling resolution and do not hit any
+				 * sampling point to be sure the sampling point
+				 * will be found the RE low pulse width will be
+				 *  extended by one clock cycle.
+				 */
+				trp_cnt = trp_cnt + 1;
+			}
+		} else {
+			/*
+			 * There is no valid window to be able to sample data.
+			 * The tRP need to be widen.
+			 * Very safe calculations are performed here.
+			 */
+			trp_cnt = (sdr->tREA_max + board_delay_skew_max
+				   + dqs_sampl_res) / clk_period;
+		}
+	}
+
+	tdvw_max = calc_tdvw_max(trp_cnt, clk_period,
+				 sdr->tRHOH_min,
+				 board_delay_skew_min, ext_rd_mode);
+
+	if (sdr->tWC_min <= clk_period &&
+	    (sdr->tWP_min + if_skew) <= (clk_period / 2) &&
+	    (sdr->tWH_min + if_skew) <= (clk_period / 2)) {
+		ext_wr_mode = 0;
+	} else {
+		u32 twh;
+
+		ext_wr_mode = 1;
+		twp_cnt = calc_cycl(sdr->tWP_min + if_skew, clk_period);
+		if ((twp_cnt + 1) * clk_period < (sdr->tALS_min + if_skew))
+			twp_cnt = calc_cycl(sdr->tALS_min + if_skew,
+					    clk_period);
+
+		twh = (sdr->tWC_min - (twp_cnt + 1) * clk_period);
+		if (sdr->tWH_min >= twh)
+			twh = sdr->tWH_min;
+
+		twh_cnt = calc_cycl(twh + if_skew, clk_period);
+	}
+
+	reg = FIELD_PREP(ASYNC_TOGGLE_TIMINGS_TRH, trh_cnt);
+	reg |= FIELD_PREP(ASYNC_TOGGLE_TIMINGS_TRP, trp_cnt);
+	reg |= FIELD_PREP(ASYNC_TOGGLE_TIMINGS_TWH, twh_cnt);
+	reg |= FIELD_PREP(ASYNC_TOGGLE_TIMINGS_TWP, twp_cnt);
+	t->async_toggle_timings = reg;
+	dev_dbg(cdns_ctrl->dev, "ASYNC_TOGGLE_TIMINGS_SDR\t%x\n", reg);
+
+	tadl_cnt = calc_cycl((sdr->tADL_min + if_skew), clk_period);
+	tccs_cnt = calc_cycl((sdr->tCCS_min + if_skew), clk_period);
+	twhr_cnt = calc_cycl((sdr->tWHR_min + if_skew), clk_period);
+	trhw_cnt = calc_cycl((sdr->tRHW_min + if_skew), clk_period);
+	reg = FIELD_PREP(TIMINGS0_TADL, tadl_cnt);
+
+	/*
+	 * If timing exceeds delay field in timing register
+	 * then use maximum value.
+	 */
+	if (FIELD_FIT(TIMINGS0_TCCS, tccs_cnt))
+		reg |= FIELD_PREP(TIMINGS0_TCCS, tccs_cnt);
+	else
+		reg |= TIMINGS0_TCCS;
+
+	reg |= FIELD_PREP(TIMINGS0_TWHR, twhr_cnt);
+	reg |= FIELD_PREP(TIMINGS0_TRHW, trhw_cnt);
+	t->timings0 = reg;
+	dev_dbg(cdns_ctrl->dev, "TIMINGS0_SDR\t%x\n", reg);
+
+	/* The following is related to single signal so skew is not needed. */
+	trhz_cnt = calc_cycl(sdr->tRHZ_max, clk_period);
+	trhz_cnt = trhz_cnt + 1;
+	twb_cnt = calc_cycl((sdr->tWB_max + board_delay), clk_period);
+	/*
+	 * Because of the two stage syncflop the value must be increased by 3
+	 * first value is related with sync, second value is related
+	 * with output if delay.
+	 */
+	twb_cnt = twb_cnt + 3 + 5;
+	/*
+	 * The following is related to the we edge of the random data input
+	 * sequence so skew is not needed.
+	 */
+	tvdly_cnt = calc_cycl(500000 + if_skew, clk_period);
+	reg = FIELD_PREP(TIMINGS1_TRHZ, trhz_cnt);
+	reg |= FIELD_PREP(TIMINGS1_TWB, twb_cnt);
+	reg |= FIELD_PREP(TIMINGS1_TVDLY, tvdly_cnt);
+	t->timings1 = reg;
+	dev_dbg(cdns_ctrl->dev, "TIMINGS1_SDR\t%x\n", reg);
+
+	tfeat_cnt = calc_cycl(sdr->tFEAT_max, clk_period);
+	if (tfeat_cnt < twb_cnt)
+		tfeat_cnt = twb_cnt;
+
+	tceh_cnt = calc_cycl(sdr->tCEH_min, clk_period);
+	tcs_cnt = calc_cycl((sdr->tCS_min + if_skew), clk_period);
+
+	reg = FIELD_PREP(TIMINGS2_TFEAT, tfeat_cnt);
+	reg |= FIELD_PREP(TIMINGS2_CS_HOLD_TIME, tceh_cnt);
+	reg |= FIELD_PREP(TIMINGS2_CS_SETUP_TIME, tcs_cnt);
+	t->timings2 = reg;
+	dev_dbg(cdns_ctrl->dev, "TIMINGS2_SDR\t%x\n", reg);
+
+	if (cdns_ctrl->caps2.is_phy_type_dll) {
+		reg = DLL_PHY_CTRL_DLL_RST_N;
+		if (ext_wr_mode)
+			reg |= DLL_PHY_CTRL_EXTENDED_WR_MODE;
+		if (ext_rd_mode)
+			reg |= DLL_PHY_CTRL_EXTENDED_RD_MODE;
+
+		reg |= FIELD_PREP(DLL_PHY_CTRL_RS_HIGH_WAIT_CNT, 7);
+		reg |= FIELD_PREP(DLL_PHY_CTRL_RS_IDLE_CNT, 7);
+		t->dll_phy_ctrl = reg;
+		dev_dbg(cdns_ctrl->dev, "DLL_PHY_CTRL_SDR\t%x\n", reg);
+	}
+
+	/* Sampling point calculation. */
+	if ((tdvw_max % dqs_sampl_res) > 0)
+		sampling_point = tdvw_max / dqs_sampl_res;
+	else
+		sampling_point = (tdvw_max / dqs_sampl_res - 1);
+
+	if (sampling_point * dqs_sampl_res > tdvw_min) {
+		dll_phy_dqs_timing =
+			FIELD_PREP(PHY_DQS_TIMING_DQS_SEL_OE_END, 4);
+		dll_phy_dqs_timing |= PHY_DQS_TIMING_USE_PHONY_DQS;
+		phony_dqs_timing = sampling_point / phony_dqs_mod;
+
+		if ((sampling_point % 2) > 0) {
+			dll_phy_dqs_timing |= PHY_DQS_TIMING_PHONY_DQS_SEL;
+			if ((tdvw_max % dqs_sampl_res) == 0)
+				/*
+				 * Calculation for sampling point at the edge
+				 * of data and being odd number.
+				 */
+				phony_dqs_timing = (tdvw_max / dqs_sampl_res)
+					/ phony_dqs_mod - 1;
+
+			if (!cdns_ctrl->caps2.is_phy_type_dll)
+				phony_dqs_timing--;
+
+		} else {
+			phony_dqs_timing--;
+		}
+		rd_del_sel = phony_dqs_timing + 3;
+	} else {
+		dev_warn(cdns_ctrl->dev,
+			 "ERROR : cannot find valid sampling point\n");
+	}
+
+	reg = FIELD_PREP(PHY_CTRL_PHONY_DQS, phony_dqs_timing);
+	if (cdns_ctrl->caps2.is_phy_type_dll)
+		reg  |= PHY_CTRL_SDR_DQS;
+	t->phy_ctrl = reg;
+	dev_dbg(cdns_ctrl->dev, "PHY_CTRL_REG_SDR\t%x\n", reg);
+
+	if (cdns_ctrl->caps2.is_phy_type_dll) {
+		dev_dbg(cdns_ctrl->dev, "PHY_TSEL_REG_SDR\t%x\n", 0);
+		dev_dbg(cdns_ctrl->dev, "PHY_DQ_TIMING_REG_SDR\t%x\n", 2);
+		dev_dbg(cdns_ctrl->dev, "PHY_DQS_TIMING_REG_SDR\t%x\n",
+			dll_phy_dqs_timing);
+		t->phy_dqs_timing = dll_phy_dqs_timing;
+
+		reg = FIELD_PREP(PHY_GATE_LPBK_CTRL_RDS, rd_del_sel);
+		dev_dbg(cdns_ctrl->dev, "PHY_GATE_LPBK_CTRL_REG_SDR\t%x\n",
+			reg);
+		t->phy_gate_lpbk_ctrl = reg;
+
+		dev_dbg(cdns_ctrl->dev, "PHY_DLL_MASTER_CTRL_REG_SDR\t%lx\n",
+			PHY_DLL_MASTER_CTRL_BYPASS_MODE);
+		dev_dbg(cdns_ctrl->dev, "PHY_DLL_SLAVE_CTRL_REG_SDR\t%x\n", 0);
+	}
+
+	return 0;
+}
+
+int cadence_nand_attach_chip(struct nand_chip *chip)
+{
+	struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
+	struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
+	u32 ecc_size = cdns_chip->sector_count * chip->ecc.bytes;
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	u32 max_oob_data_size;
+	int ret;
+
+	if (chip->options & NAND_BUSWIDTH_16) {
+		ret = cadence_nand_set_access_width16(cdns_ctrl, true);
+		if (ret)
+			return ret;
+	}
+
+	chip->bbt_options |= NAND_BBT_USE_FLASH;
+	chip->bbt_options |= NAND_BBT_NO_OOB;
+	chip->ecc.mode = NAND_ECC_HW;
+
+	chip->options |= NAND_NO_SUBPAGE_WRITE;
+
+	cdns_chip->bbm_offs = chip->badblockpos;
+	if (chip->options & NAND_BUSWIDTH_16) {
+		cdns_chip->bbm_offs &= ~0x01;
+		cdns_chip->bbm_len = 2;
+	} else {
+		cdns_chip->bbm_len = 1;
+	}
+
+	ret = nand_ecc_choose_conf(chip,
+				   &cdns_ctrl->ecc_caps,
+				   mtd->oobsize - cdns_chip->bbm_len);
+	if (ret) {
+		dev_err(cdns_ctrl->dev, "ECC configuration failed\n");
+		return ret;
+	}
+
+	dev_dbg(cdns_ctrl->dev,
+		"chosen ECC settings: step=%d, strength=%d, bytes=%d\n",
+		chip->ecc.size, chip->ecc.strength, chip->ecc.bytes);
+
+	/* Error correction configuration. */
+	cdns_chip->sector_size = chip->ecc.size;
+	cdns_chip->sector_count = mtd->writesize / cdns_chip->sector_size;
+
+	cdns_chip->avail_oob_size = mtd->oobsize - ecc_size;
+
+	max_oob_data_size = MAX_OOB_SIZE_PER_SECTOR;
+
+	if (cdns_chip->avail_oob_size > max_oob_data_size)
+		cdns_chip->avail_oob_size = max_oob_data_size;
+
+	if ((cdns_chip->avail_oob_size + cdns_chip->bbm_len + ecc_size)
+	    > mtd->oobsize)
+		cdns_chip->avail_oob_size -= 4;
+
+	ret = cadence_nand_get_ecc_strength_idx(cdns_ctrl, chip->ecc.strength);
+	if (ret < 0)
+		return -EINVAL;
+
+	cdns_chip->corr_str_idx = (u8)ret;
+
+	if (cadence_nand_wait_for_value(cdns_ctrl, CTRL_STATUS,
+					1000000,
+					CTRL_STATUS_CTRL_BUSY, true))
+		return -ETIMEDOUT;
+
+	cadence_nand_set_ecc_strength(cdns_ctrl,
+				      cdns_chip->corr_str_idx);
+
+	cadence_nand_set_erase_detection(cdns_ctrl, true,
+					 chip->ecc.strength);
+
+	/* Override the default read operations. */
+	chip->ecc.read_page = cadence_nand_read_page;
+	chip->ecc.read_page_raw = cadence_nand_read_page_raw;
+	chip->ecc.write_page = cadence_nand_write_page;
+	chip->ecc.write_page_raw = cadence_nand_write_page_raw;
+	chip->ecc.read_oob = cadence_nand_read_oob;
+	chip->ecc.write_oob = cadence_nand_write_oob;
+	chip->ecc.read_oob_raw = cadence_nand_read_oob_raw;
+	chip->ecc.write_oob_raw = cadence_nand_write_oob_raw;
+
+	if ((mtd->writesize + mtd->oobsize) > cdns_ctrl->buf_size)
+		cdns_ctrl->buf_size = mtd->writesize + mtd->oobsize;
+
+	/* Is 32-bit DMA supported? */
+	ret = dma_set_mask(cdns_ctrl->dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(cdns_ctrl->dev, "no usable DMA configuration\n");
+		return ret;
+	}
+
+	mtd_set_ooblayout(mtd, &cadence_nand_ooblayout_ops);
+
+	return 0;
+}
+
+static const struct nand_controller_ops cadence_nand_controller_ops = {
+	.attach_chip = cadence_nand_attach_chip,
+	.exec_op = cadence_nand_exec_op,
+	.setup_data_interface = cadence_nand_setup_data_interface,
+};
+
+static int cadence_nand_chip_init(struct cdns_nand_ctrl *cdns_ctrl,
+				  struct device_node *np)
+{
+	struct cdns_nand_chip *cdns_chip;
+	struct mtd_info *mtd;
+	struct nand_chip *chip;
+	int nsels, ret, i;
+	u32 cs;
+
+	nsels = of_property_count_elems_of_size(np, "reg", sizeof(u32));
+	if (nsels <= 0) {
+		dev_err(cdns_ctrl->dev, "missing/invalid reg property\n");
+		return -EINVAL;
+	}
+
+	/* Allocate the nand chip structure. */
+	cdns_chip = devm_kzalloc(cdns_ctrl->dev, sizeof(*cdns_chip) +
+				 (nsels * sizeof(u8)),
+				 GFP_KERNEL);
+	if (!cdns_chip) {
+		dev_err(cdns_ctrl->dev, "could not allocate chip structure\n");
+		return -ENOMEM;
+	}
+
+	cdns_chip->nsels = nsels;
+
+	for (i = 0; i < nsels; i++) {
+		/* Retrieve CS id. */
+		ret = of_property_read_u32_index(np, "reg", i, &cs);
+		if (ret) {
+			dev_err(cdns_ctrl->dev,
+				"could not retrieve reg property: %d\n",
+				ret);
+			return ret;
+		}
+
+		if (cs >= cdns_ctrl->caps2.max_banks) {
+			dev_err(cdns_ctrl->dev,
+				"invalid reg value: %u (max CS = %d)\n",
+				cs, cdns_ctrl->caps2.max_banks);
+			return -EINVAL;
+		}
+
+		if (test_and_set_bit(cs, &cdns_ctrl->assigned_cs)) {
+			dev_err(cdns_ctrl->dev,
+				"CS %d already assigned\n", cs);
+			return -EINVAL;
+		}
+
+		cdns_chip->cs[i] = cs;
+	}
+
+	chip = &cdns_chip->chip;
+	chip->controller = &cdns_ctrl->controller;
+	nand_set_flash_node(chip, np);
+
+	mtd = nand_to_mtd(chip);
+	mtd->dev.parent = cdns_ctrl->dev;
+
+	/*
+	 * Default to HW ECC engine mode. If the nand-ecc-mode property is given
+	 * in the DT node, this entry will be overwritten in nand_scan_ident().
+	 */
+	chip->ecc.mode = NAND_ECC_HW;
+
+	ret = nand_scan(chip, cdns_chip->nsels);
+	if (ret) {
+		dev_err(cdns_ctrl->dev, "could not scan the nand chip\n");
+		return ret;
+	}
+
+	ret = mtd_device_register(mtd, NULL, 0);
+	if (ret) {
+		dev_err(cdns_ctrl->dev,
+			"failed to register mtd device: %d\n", ret);
+		nand_cleanup(chip);
+		return ret;
+	}
+
+	list_add_tail(&cdns_chip->node, &cdns_ctrl->chips);
+
+	return 0;
+}
+
+static void cadence_nand_chips_cleanup(struct cdns_nand_ctrl *cdns_ctrl)
+{
+	struct cdns_nand_chip *entry, *temp;
+
+	list_for_each_entry_safe(entry, temp, &cdns_ctrl->chips, node) {
+		nand_release(&entry->chip);
+		list_del(&entry->node);
+	}
+}
+
+static int cadence_nand_chips_init(struct cdns_nand_ctrl *cdns_ctrl)
+{
+	struct device_node *np = cdns_ctrl->dev->of_node;
+	struct device_node *nand_np;
+	int max_cs = cdns_ctrl->caps2.max_banks;
+	int nchips, ret;
+
+	nchips = of_get_child_count(np);
+
+	if (nchips > max_cs) {
+		dev_err(cdns_ctrl->dev,
+			"too many NAND chips: %d (max = %d CS)\n",
+			nchips, max_cs);
+		return -EINVAL;
+	}
+
+	for_each_child_of_node(np, nand_np) {
+		ret = cadence_nand_chip_init(cdns_ctrl, nand_np);
+		if (ret) {
+			of_node_put(nand_np);
+			cadence_nand_chips_cleanup(cdns_ctrl);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static void
+cadence_nand_irq_cleanup(int irqnum, struct cdns_nand_ctrl *cdns_ctrl)
+{
+	/* Disable interrupts. */
+	writel_relaxed(INTR_ENABLE_INTR_EN, cdns_ctrl->reg + INTR_ENABLE);
+}
+
+static int cadence_nand_init(struct cdns_nand_ctrl *cdns_ctrl)
+{
+	dma_cap_mask_t mask;
+	int ret;
+
+	cdns_ctrl->cdma_desc = dma_alloc_coherent(cdns_ctrl->dev,
+						  sizeof(*cdns_ctrl->cdma_desc),
+						  &cdns_ctrl->dma_cdma_desc,
+						  GFP_KERNEL);
+	if (!cdns_ctrl->dma_cdma_desc)
+		return -ENOMEM;
+
+	cdns_ctrl->buf_size = SZ_16K;
+	cdns_ctrl->buf = kmalloc(cdns_ctrl->buf_size, GFP_KERNEL);
+	if (!cdns_ctrl->buf) {
+		ret = -ENOMEM;
+		goto free_buf_desc;
+	}
+
+	if (devm_request_irq(cdns_ctrl->dev, cdns_ctrl->irq, cadence_nand_isr,
+			     IRQF_SHARED, "cadence-nand-controller",
+			     cdns_ctrl)) {
+		dev_err(cdns_ctrl->dev, "Unable to allocate IRQ\n");
+		ret = -ENODEV;
+		goto free_buf;
+	}
+
+	spin_lock_init(&cdns_ctrl->irq_lock);
+	init_completion(&cdns_ctrl->complete);
+
+	ret = cadence_nand_hw_init(cdns_ctrl);
+	if (ret)
+		goto disable_irq;
+
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_MEMCPY, mask);
+
+	if (cdns_ctrl->caps1->has_dma) {
+		cdns_ctrl->dmac = dma_request_channel(mask, NULL, NULL);
+		if (!cdns_ctrl->dmac) {
+			dev_err(cdns_ctrl->dev,
+				"Unable to get a DMA channel\n");
+			ret = -EBUSY;
+			goto disable_irq;
+		}
+	}
+
+	nand_controller_init(&cdns_ctrl->controller);
+	INIT_LIST_HEAD(&cdns_ctrl->chips);
+
+	cdns_ctrl->controller.ops = &cadence_nand_controller_ops;
+	cdns_ctrl->curr_corr_str_idx = 0xFF;
+
+	ret = cadence_nand_chips_init(cdns_ctrl);
+	if (ret) {
+		dev_err(cdns_ctrl->dev, "Failed to register MTD: %d\n",
+			ret);
+		goto dma_release_chnl;
+	}
+
+	kfree(cdns_ctrl->buf);
+	cdns_ctrl->buf = kzalloc(cdns_ctrl->buf_size, GFP_KERNEL);
+	if (!cdns_ctrl->buf) {
+		ret = -ENOMEM;
+		goto dma_release_chnl;
+	}
+
+	return 0;
+
+dma_release_chnl:
+	if (cdns_ctrl->dmac)
+		dma_release_channel(cdns_ctrl->dmac);
+
+disable_irq:
+	cadence_nand_irq_cleanup(cdns_ctrl->irq, cdns_ctrl);
+
+free_buf:
+	kfree(cdns_ctrl->buf);
+
+free_buf_desc:
+	dma_free_coherent(cdns_ctrl->dev, sizeof(struct cadence_nand_cdma_desc),
+			  cdns_ctrl->cdma_desc, cdns_ctrl->dma_cdma_desc);
+
+	return ret;
+}
+
+/* Driver exit point. */
+static void cadence_nand_remove(struct cdns_nand_ctrl *cdns_ctrl)
+{
+	cadence_nand_chips_cleanup(cdns_ctrl);
+	cadence_nand_irq_cleanup(cdns_ctrl->irq, cdns_ctrl);
+	kfree(cdns_ctrl->buf);
+	dma_free_coherent(cdns_ctrl->dev, sizeof(struct cadence_nand_cdma_desc),
+			  cdns_ctrl->cdma_desc, cdns_ctrl->dma_cdma_desc);
+
+	if (cdns_ctrl->dmac)
+		dma_release_channel(cdns_ctrl->dmac);
+}
+
+struct cadence_nand_dt {
+	struct cdns_nand_ctrl cdns_ctrl;
+	struct clk *clk;
+};
+
+static const struct cadence_nand_dt_devdata cadence_nand_default = {
+	.if_skew = 0,
+	.has_dma = 1,
+};
+
+static const struct of_device_id cadence_nand_dt_ids[] = {
+	{
+		.compatible = "cdns,hp-nfc",
+		.data = &cadence_nand_default
+	}, {}
+};
+
+MODULE_DEVICE_TABLE(of, cadence_nand_dt_ids);
+
+static int cadence_nand_dt_probe(struct platform_device *ofdev)
+{
+	struct resource *res;
+	struct cadence_nand_dt *dt;
+	struct cdns_nand_ctrl *cdns_ctrl;
+	int ret;
+	const struct of_device_id *of_id;
+	const struct cadence_nand_dt_devdata *devdata;
+	u32 val;
+
+	of_id = of_match_device(cadence_nand_dt_ids, &ofdev->dev);
+	if (of_id) {
+		ofdev->id_entry = of_id->data;
+		devdata = of_id->data;
+	} else {
+		pr_err("Failed to find the right device id.\n");
+		return -ENOMEM;
+	}
+
+	dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);
+	if (!dt)
+		return -ENOMEM;
+
+	cdns_ctrl = &dt->cdns_ctrl;
+	cdns_ctrl->caps1 = devdata;
+
+	cdns_ctrl->dev = &ofdev->dev;
+	cdns_ctrl->irq = platform_get_irq(ofdev, 0);
+	if (cdns_ctrl->irq < 0)
+		return cdns_ctrl->irq;
+
+	dev_info(cdns_ctrl->dev, "IRQ: nr %d\n", cdns_ctrl->irq);
+
+	cdns_ctrl->reg = devm_platform_ioremap_resource(ofdev, 0);
+	if (IS_ERR(cdns_ctrl->reg)) {
+		dev_err(&ofdev->dev, "devm_ioremap_resource res 0 failed\n");
+		return PTR_ERR(cdns_ctrl->reg);
+	}
+
+	res = platform_get_resource(ofdev, IORESOURCE_MEM, 1);
+	cdns_ctrl->io.dma = res->start;
+	cdns_ctrl->io.virt = devm_ioremap_resource(&ofdev->dev, res);
+	if (IS_ERR(cdns_ctrl->io.virt)) {
+		dev_err(cdns_ctrl->dev, "devm_ioremap_resource res 1 failed\n");
+		return PTR_ERR(cdns_ctrl->io.virt);
+	}
+
+	dt->clk = devm_clk_get(cdns_ctrl->dev, "nf_clk");
+	if (IS_ERR(dt->clk))
+		return PTR_ERR(dt->clk);
+
+	cdns_ctrl->nf_clk_rate = clk_get_rate(dt->clk);
+
+	ret = of_property_read_u32(ofdev->dev.of_node,
+				   "cdns,board-delay-ps", &val);
+	if (ret) {
+		val = 4830;
+		dev_info(cdns_ctrl->dev,
+			 "missing cdns,board-delay-ps property, %d was set\n",
+			 val);
+	}
+	cdns_ctrl->board_delay = val;
+
+	ret = cadence_nand_init(cdns_ctrl);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(ofdev, dt);
+	return 0;
+}
+
+static int cadence_nand_dt_remove(struct platform_device *ofdev)
+{
+	struct cadence_nand_dt *dt = platform_get_drvdata(ofdev);
+
+	cadence_nand_remove(&dt->cdns_ctrl);
+
+	return 0;
+}
+
+static struct platform_driver cadence_nand_dt_driver = {
+	.probe		= cadence_nand_dt_probe,
+	.remove		= cadence_nand_dt_remove,
+	.driver		= {
+		.name	= "cadence-nand-controller",
+		.of_match_table = cadence_nand_dt_ids,
+	},
+};
+
+module_platform_driver(cadence_nand_dt_driver);
+
+MODULE_AUTHOR("Piotr Sroka <piotrs@cadence.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Driver for Cadence NAND flash controller");
+
diff --git a/drivers/mtd/nand/raw/denali_dt.c b/drivers/mtd/nand/raw/denali_dt.c
index 5e14836f6bd5..8b779a899dcf 100644
--- a/drivers/mtd/nand/raw/denali_dt.c
+++ b/drivers/mtd/nand/raw/denali_dt.c
@@ -102,47 +102,6 @@ static int denali_dt_chip_init(struct denali_controller *denali,
 	return denali_chip_init(denali, dchip);
 }
 
-/* Backward compatibility for old platforms */
-static int denali_dt_legacy_chip_init(struct denali_controller *denali)
-{
-	struct denali_chip *dchip;
-	int nsels, i;
-
-	nsels = denali->nbanks;
-
-	dchip = devm_kzalloc(denali->dev, struct_size(dchip, sels, nsels),
-			     GFP_KERNEL);
-	if (!dchip)
-		return -ENOMEM;
-
-	dchip->nsels = nsels;
-
-	for (i = 0; i < nsels; i++)
-		dchip->sels[i].bank = i;
-
-	nand_set_flash_node(&dchip->chip, denali->dev->of_node);
-
-	return denali_chip_init(denali, dchip);
-}
-
-/*
- * Check the DT binding.
- * The new binding expects chip subnodes in the controller node.
- * So, #address-cells = <1>; #size-cells = <0>; are required.
- * Check the #size-cells to distinguish the binding.
- */
-static bool denali_dt_is_legacy_binding(struct device_node *np)
-{
-	u32 cells;
-	int ret;
-
-	ret = of_property_read_u32(np, "#size-cells", &cells);
-	if (ret)
-		return true;
-
-	return cells != 0;
-}
-
 static int denali_dt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -167,10 +126,8 @@ static int denali_dt_probe(struct platform_device *pdev)
 
 	denali->dev = dev;
 	denali->irq = platform_get_irq(pdev, 0);
-	if (denali->irq < 0) {
-		dev_err(dev, "no irq defined\n");
+	if (denali->irq < 0)
 		return denali->irq;
-	}
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "denali_reg");
 	denali->reg = devm_ioremap_resource(dev, res);
@@ -213,17 +170,11 @@ static int denali_dt_probe(struct platform_device *pdev)
 	if (ret)
 		goto out_disable_clk_ecc;
 
-	if (denali_dt_is_legacy_binding(dev->of_node)) {
-		ret = denali_dt_legacy_chip_init(denali);
-		if (ret)
+	for_each_child_of_node(dev->of_node, np) {
+		ret = denali_dt_chip_init(denali, np);
+		if (ret) {
+			of_node_put(np);
 			goto out_remove_denali;
-	} else {
-		for_each_child_of_node(dev->of_node, np) {
-			ret = denali_dt_chip_init(denali, np);
-			if (ret) {
-				of_node_put(np);
-				goto out_remove_denali;
-			}
 		}
 	}
 
diff --git a/drivers/mtd/nand/raw/hisi504_nand.c b/drivers/mtd/nand/raw/hisi504_nand.c
index 6a4626a8bf95..0b48be54ba6f 100644
--- a/drivers/mtd/nand/raw/hisi504_nand.c
+++ b/drivers/mtd/nand/raw/hisi504_nand.c
@@ -751,10 +751,8 @@ static int hisi_nfc_probe(struct platform_device *pdev)
 	mtd  = nand_to_mtd(chip);
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(dev, "no IRQ resource defined\n");
+	if (irq < 0)
 		return -ENXIO;
-	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	host->iobase = devm_ioremap_resource(dev, res);
diff --git a/drivers/mtd/nand/raw/lpc32xx_mlc.c b/drivers/mtd/nand/raw/lpc32xx_mlc.c
index 78b31f845c50..241b58b83240 100644
--- a/drivers/mtd/nand/raw/lpc32xx_mlc.c
+++ b/drivers/mtd/nand/raw/lpc32xx_mlc.c
@@ -773,7 +773,6 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 
 	host->irq = platform_get_irq(pdev, 0);
 	if (host->irq < 0) {
-		dev_err(&pdev->dev, "failed to get platform irq\n");
 		res = -EINVAL;
 		goto release_dma_chan;
 	}
diff --git a/drivers/mtd/nand/raw/marvell_nand.c b/drivers/mtd/nand/raw/marvell_nand.c
index fc49e13d81ec..fb5abdcfb007 100644
--- a/drivers/mtd/nand/raw/marvell_nand.c
+++ b/drivers/mtd/nand/raw/marvell_nand.c
@@ -2862,10 +2862,8 @@ static int marvell_nfc_probe(struct platform_device *pdev)
 		return PTR_ERR(nfc->regs);
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(dev, "failed to retrieve irq\n");
+	if (irq < 0)
 		return irq;
-	}
 
 	nfc->core_clk = devm_clk_get(&pdev->dev, "core");
 
diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
index 1b82b687e5a5..9f17b5b8efbf 100644
--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -1399,10 +1399,8 @@ static int meson_nfc_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(dev, "no NFC IRQ resource\n");
+	if (irq < 0)
 		return -EINVAL;
-	}
 
 	ret = meson_nfc_clk_init(nfc);
 	if (ret) {
diff --git a/drivers/mtd/nand/raw/mtk_ecc.c b/drivers/mtd/nand/raw/mtk_ecc.c
index 74595b644b7c..75f1fa3d4d35 100644
--- a/drivers/mtd/nand/raw/mtk_ecc.c
+++ b/drivers/mtd/nand/raw/mtk_ecc.c
@@ -527,10 +527,8 @@ static int mtk_ecc_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(dev, "failed to get irq: %d\n", irq);
+	if (irq < 0)
 		return irq;
-	}
 
 	ret = dma_set_mask(dev, DMA_BIT_MASK(32));
 	if (ret) {
diff --git a/drivers/mtd/nand/raw/mtk_nand.c b/drivers/mtd/nand/raw/mtk_nand.c
index 373d47d1ba4c..b8305e39ab51 100644
--- a/drivers/mtd/nand/raw/mtk_nand.c
+++ b/drivers/mtd/nand/raw/mtk_nand.c
@@ -1540,7 +1540,6 @@ static int mtk_nfc_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		dev_err(dev, "no nfi irq resource\n");
 		ret = -EINVAL;
 		goto clk_disable;
 	}
diff --git a/drivers/mtd/nand/raw/mxic_nand.c b/drivers/mtd/nand/raw/mxic_nand.c
index 9d49e6c845e1..ed7a4e021bf5 100644
--- a/drivers/mtd/nand/raw/mxic_nand.c
+++ b/drivers/mtd/nand/raw/mxic_nand.c
@@ -524,10 +524,8 @@ static int mxic_nfc_probe(struct platform_device *pdev)
 	nand_chip->controller = &nfc->controller;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev, "failed to retrieve irq\n");
+	if (irq < 0)
 		return irq;
-	}
 
 	mxic_nfc_hw_init(nfc);
 
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 5c2c30a7dffa..f64e3b6605c6 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -292,12 +292,16 @@ int nand_bbm_get_next_page(struct nand_chip *chip, int page)
 	struct mtd_info *mtd = nand_to_mtd(chip);
 	int last_page = ((mtd->erasesize - mtd->writesize) >>
 			 chip->page_shift) & chip->pagemask;
+	unsigned int bbm_flags = NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE
+		| NAND_BBM_LASTPAGE;
 
+	if (page == 0 && !(chip->options & bbm_flags))
+		return 0;
 	if (page == 0 && chip->options & NAND_BBM_FIRSTPAGE)
 		return 0;
-	else if (page <= 1 && chip->options & NAND_BBM_SECONDPAGE)
+	if (page <= 1 && chip->options & NAND_BBM_SECONDPAGE)
 		return 1;
-	else if (page <= last_page && chip->options & NAND_BBM_LASTPAGE)
+	if (page <= last_page && chip->options & NAND_BBM_LASTPAGE)
 		return last_page;
 
 	return -EINVAL;
diff --git a/drivers/mtd/nand/raw/nand_micron.c b/drivers/mtd/nand/raw/nand_micron.c
index 8ca9fad6e6ad..56654030ec7f 100644
--- a/drivers/mtd/nand/raw/nand_micron.c
+++ b/drivers/mtd/nand/raw/nand_micron.c
@@ -446,8 +446,10 @@ static int micron_nand_init(struct nand_chip *chip)
 	if (ret)
 		goto err_free_manuf_data;
 
+	chip->options |= NAND_BBM_FIRSTPAGE;
+
 	if (mtd->writesize == 2048)
-		chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
+		chip->options |= NAND_BBM_SECONDPAGE;
 
 	ondie = micron_supports_on_die_ecc(chip);
 
diff --git a/drivers/mtd/nand/raw/omap2.c b/drivers/mtd/nand/raw/omap2.c
index 6ec65f48501c..ad77c112a78a 100644
--- a/drivers/mtd/nand/raw/omap2.c
+++ b/drivers/mtd/nand/raw/omap2.c
@@ -1967,10 +1967,8 @@ static int omap_nand_attach_chip(struct nand_chip *chip)
 
 	case NAND_OMAP_PREFETCH_IRQ:
 		info->gpmc_irq_fifo = platform_get_irq(info->pdev, 0);
-		if (info->gpmc_irq_fifo <= 0) {
-			dev_err(dev, "Error getting fifo IRQ\n");
+		if (info->gpmc_irq_fifo <= 0)
 			return -ENODEV;
-		}
 		err = devm_request_irq(dev, info->gpmc_irq_fifo,
 				       omap_nand_irq, IRQF_SHARED,
 				       "gpmc-nand-fifo", info);
@@ -1982,10 +1980,8 @@ static int omap_nand_attach_chip(struct nand_chip *chip)
 		}
 
 		info->gpmc_irq_count = platform_get_irq(info->pdev, 1);
-		if (info->gpmc_irq_count <= 0) {
-			dev_err(dev, "Error getting IRQ count\n");
+		if (info->gpmc_irq_count <= 0)
 			return -ENODEV;
-		}
 		err = devm_request_irq(dev, info->gpmc_irq_count,
 				       omap_nand_irq, IRQF_SHARED,
 				       "gpmc-nand-count", info);
diff --git a/drivers/mtd/nand/raw/sh_flctl.c b/drivers/mtd/nand/raw/sh_flctl.c
index e509c93737c4..058e99d0cbcf 100644
--- a/drivers/mtd/nand/raw/sh_flctl.c
+++ b/drivers/mtd/nand/raw/sh_flctl.c
@@ -1129,10 +1129,8 @@ static int flctl_probe(struct platform_device *pdev)
 	flctl->fifo = res->start + 0x24; /* FLDTFIFO */
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev, "failed to get flste irq data: %d\n", irq);
+	if (irq < 0)
 		return irq;
-	}
 
 	ret = devm_request_irq(&pdev->dev, irq, flctl_handle_flste, IRQF_SHARED,
 			       "flste", flctl);
diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
index 8cc852dc7d54..9e63800f768a 100644
--- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
+++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
@@ -1880,11 +1880,8 @@ static int stm32_fmc2_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		if (irq != -EPROBE_DEFER)
-			dev_err(dev, "IRQ error missing or invalid\n");
+	if (irq < 0)
 		return irq;
-	}
 
 	ret = devm_request_irq(dev, irq, stm32_fmc2_irq, 0,
 			       dev_name(dev), fmc2);
diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
index 89773293c64d..37a4ac0dd85b 100644
--- a/drivers/mtd/nand/raw/sunxi_nand.c
+++ b/drivers/mtd/nand/raw/sunxi_nand.c
@@ -2071,10 +2071,8 @@ static int sunxi_nfc_probe(struct platform_device *pdev)
 		return PTR_ERR(nfc->regs);
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(dev, "failed to retrieve irq\n");
+	if (irq < 0)
 		return irq;
-	}
 
 	nfc->ahb_clk = devm_clk_get(dev, "ahb");
 	if (IS_ERR(nfc->ahb_clk)) {
diff --git a/drivers/mtd/spi-nor/aspeed-smc.c b/drivers/mtd/spi-nor/aspeed-smc.c
index 009c1da8574c..2b7cabbb680c 100644
--- a/drivers/mtd/spi-nor/aspeed-smc.c
+++ b/drivers/mtd/spi-nor/aspeed-smc.c
@@ -320,7 +320,8 @@ static void aspeed_smc_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
 	mutex_unlock(&chip->controller->mutex);
 }
 
-static int aspeed_smc_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+static int aspeed_smc_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
+			       size_t len)
 {
 	struct aspeed_smc_chip *chip = nor->priv;
 
@@ -331,8 +332,8 @@ static int aspeed_smc_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
 	return 0;
 }
 
-static int aspeed_smc_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
-				int len)
+static int aspeed_smc_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
+				size_t len)
 {
 	struct aspeed_smc_chip *chip = nor->priv;
 
@@ -746,6 +747,15 @@ static int aspeed_smc_chip_setup_finish(struct aspeed_smc_chip *chip)
 	return 0;
 }
 
+static const struct spi_nor_controller_ops aspeed_smc_controller_ops = {
+	.prepare = aspeed_smc_prep,
+	.unprepare = aspeed_smc_unprep,
+	.read_reg = aspeed_smc_read_reg,
+	.write_reg = aspeed_smc_write_reg,
+	.read = aspeed_smc_read_user,
+	.write = aspeed_smc_write_user,
+};
+
 static int aspeed_smc_setup_flash(struct aspeed_smc_controller *controller,
 				  struct device_node *np, struct resource *r)
 {
@@ -805,12 +815,7 @@ static int aspeed_smc_setup_flash(struct aspeed_smc_controller *controller,
 		nor->dev = dev;
 		nor->priv = chip;
 		spi_nor_set_flash_node(nor, child);
-		nor->read = aspeed_smc_read_user;
-		nor->write = aspeed_smc_write_user;
-		nor->read_reg = aspeed_smc_read_reg;
-		nor->write_reg = aspeed_smc_write_reg;
-		nor->prepare = aspeed_smc_prep;
-		nor->unprepare = aspeed_smc_unprep;
+		nor->controller_ops = &aspeed_smc_controller_ops;
 
 		ret = aspeed_smc_chip_setup_init(chip, r);
 		if (ret)
diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
index 7bef63947b29..06f997247d0f 100644
--- a/drivers/mtd/spi-nor/cadence-quadspi.c
+++ b/drivers/mtd/spi-nor/cadence-quadspi.c
@@ -285,7 +285,7 @@ static irqreturn_t cqspi_irq_handler(int this_irq, void *dev)
 	return IRQ_HANDLED;
 }
 
-static unsigned int cqspi_calc_rdreg(struct spi_nor *nor, const u8 opcode)
+static unsigned int cqspi_calc_rdreg(struct spi_nor *nor)
 {
 	struct cqspi_flash_pdata *f_pdata = nor->priv;
 	u32 rdreg = 0;
@@ -354,27 +354,27 @@ static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg)
 	return cqspi_wait_idle(cqspi);
 }
 
-static int cqspi_command_read(struct spi_nor *nor,
-			      const u8 *txbuf, const unsigned n_tx,
-			      u8 *rxbuf, const unsigned n_rx)
+static int cqspi_command_read(struct spi_nor *nor, u8 opcode,
+			      u8 *rxbuf, size_t n_rx)
 {
 	struct cqspi_flash_pdata *f_pdata = nor->priv;
 	struct cqspi_st *cqspi = f_pdata->cqspi;
 	void __iomem *reg_base = cqspi->iobase;
 	unsigned int rdreg;
 	unsigned int reg;
-	unsigned int read_len;
+	size_t read_len;
 	int status;
 
 	if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) {
-		dev_err(nor->dev, "Invalid input argument, len %d rxbuf 0x%p\n",
+		dev_err(nor->dev,
+			"Invalid input argument, len %zu rxbuf 0x%p\n",
 			n_rx, rxbuf);
 		return -EINVAL;
 	}
 
-	reg = txbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+	reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
 
-	rdreg = cqspi_calc_rdreg(nor, txbuf[0]);
+	rdreg = cqspi_calc_rdreg(nor);
 	writel(rdreg, reg_base + CQSPI_REG_RD_INSTR);
 
 	reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);
@@ -404,19 +404,19 @@ static int cqspi_command_read(struct spi_nor *nor,
 }
 
 static int cqspi_command_write(struct spi_nor *nor, const u8 opcode,
-			       const u8 *txbuf, const unsigned n_tx)
+			       const u8 *txbuf, size_t n_tx)
 {
 	struct cqspi_flash_pdata *f_pdata = nor->priv;
 	struct cqspi_st *cqspi = f_pdata->cqspi;
 	void __iomem *reg_base = cqspi->iobase;
 	unsigned int reg;
 	unsigned int data;
-	u32 write_len;
+	size_t write_len;
 	int ret;
 
 	if (n_tx > CQSPI_STIG_DATA_LEN_MAX || (n_tx && !txbuf)) {
 		dev_err(nor->dev,
-			"Invalid input argument, cmdlen %d txbuf 0x%p\n",
+			"Invalid input argument, cmdlen %zu txbuf 0x%p\n",
 			n_tx, txbuf);
 		return -EINVAL;
 	}
@@ -470,7 +470,7 @@ static int cqspi_read_setup(struct spi_nor *nor)
 	unsigned int reg;
 
 	reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
-	reg |= cqspi_calc_rdreg(nor, nor->read_opcode);
+	reg |= cqspi_calc_rdreg(nor);
 
 	/* Setup dummy clock cycles */
 	dummy_clk = nor->read_dummy;
@@ -603,7 +603,7 @@ static int cqspi_write_setup(struct spi_nor *nor)
 	/* Set opcode. */
 	reg = nor->program_opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
 	writel(reg, reg_base + CQSPI_REG_WR_INSTR);
-	reg = cqspi_calc_rdreg(nor, nor->program_opcode);
+	reg = cqspi_calc_rdreg(nor);
 	writel(reg, reg_base + CQSPI_REG_RD_INSTR);
 
 	reg = readl(reg_base + CQSPI_REG_SIZE);
@@ -1050,7 +1050,7 @@ static int cqspi_erase(struct spi_nor *nor, loff_t offs)
 		return ret;
 
 	/* Send write enable, then erase commands. */
-	ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
+	ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
 	if (ret)
 		return ret;
 
@@ -1080,18 +1080,19 @@ static void cqspi_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
 	mutex_unlock(&cqspi->bus_mutex);
 }
 
-static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, size_t len)
 {
 	int ret;
 
 	ret = cqspi_set_protocol(nor, 0);
 	if (!ret)
-		ret = cqspi_command_read(nor, &opcode, 1, buf, len);
+		ret = cqspi_command_read(nor, opcode, buf, len);
 
 	return ret;
 }
 
-static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
+			   size_t len)
 {
 	int ret;
 
@@ -1216,6 +1217,16 @@ static void cqspi_request_mmap_dma(struct cqspi_st *cqspi)
 	init_completion(&cqspi->rx_dma_complete);
 }
 
+static const struct spi_nor_controller_ops cqspi_controller_ops = {
+	.prepare = cqspi_prep,
+	.unprepare = cqspi_unprep,
+	.read_reg = cqspi_read_reg,
+	.write_reg = cqspi_write_reg,
+	.read = cqspi_read,
+	.write = cqspi_write,
+	.erase = cqspi_erase,
+};
+
 static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
 {
 	struct platform_device *pdev = cqspi->pdev;
@@ -1265,14 +1276,7 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
 		nor->dev = dev;
 		spi_nor_set_flash_node(nor, np);
 		nor->priv = f_pdata;
-
-		nor->read_reg = cqspi_read_reg;
-		nor->write_reg = cqspi_write_reg;
-		nor->read = cqspi_read;
-		nor->write = cqspi_write;
-		nor->erase = cqspi_erase;
-		nor->prepare = cqspi_prep;
-		nor->unprepare = cqspi_unprep;
+		nor->controller_ops = &cqspi_controller_ops;
 
 		mtd->name = devm_kasprintf(dev, GFP_KERNEL, "%s.%d",
 					   dev_name(dev), cs);
@@ -1366,10 +1370,8 @@ static int cqspi_probe(struct platform_device *pdev)
 
 	/* Obtain IRQ line. */
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(dev, "Cannot obtain IRQ.\n");
+	if (irq < 0)
 		return -ENXIO;
-	}
 
 	pm_runtime_enable(dev);
 	ret = pm_runtime_get_sync(dev);
diff --git a/drivers/mtd/spi-nor/hisi-sfc.c b/drivers/mtd/spi-nor/hisi-sfc.c
index 6dac9dd8bf42..a1258216f89d 100644
--- a/drivers/mtd/spi-nor/hisi-sfc.c
+++ b/drivers/mtd/spi-nor/hisi-sfc.c
@@ -177,7 +177,7 @@ static void hisi_spi_nor_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
 }
 
 static int hisi_spi_nor_op_reg(struct spi_nor *nor,
-				u8 opcode, int len, u8 optype)
+				u8 opcode, size_t len, u8 optype)
 {
 	struct hifmc_priv *priv = nor->priv;
 	struct hifmc_host *host = priv->host;
@@ -200,7 +200,7 @@ static int hisi_spi_nor_op_reg(struct spi_nor *nor,
 }
 
 static int hisi_spi_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
-		int len)
+				 size_t len)
 {
 	struct hifmc_priv *priv = nor->priv;
 	struct hifmc_host *host = priv->host;
@@ -215,7 +215,7 @@ static int hisi_spi_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
 }
 
 static int hisi_spi_nor_write_reg(struct spi_nor *nor, u8 opcode,
-				u8 *buf, int len)
+				  const u8 *buf, size_t len)
 {
 	struct hifmc_priv *priv = nor->priv;
 	struct hifmc_host *host = priv->host;
@@ -311,6 +311,15 @@ static ssize_t hisi_spi_nor_write(struct spi_nor *nor, loff_t to,
 	return len;
 }
 
+static const struct spi_nor_controller_ops hisi_controller_ops = {
+	.prepare = hisi_spi_nor_prep,
+	.unprepare = hisi_spi_nor_unprep,
+	.read_reg = hisi_spi_nor_read_reg,
+	.write_reg = hisi_spi_nor_write_reg,
+	.read = hisi_spi_nor_read,
+	.write = hisi_spi_nor_write,
+};
+
 /**
  * Get spi flash device information and register it as a mtd device.
  */
@@ -357,14 +366,8 @@ static int hisi_spi_nor_register(struct device_node *np,
 	}
 	priv->host = host;
 	nor->priv = priv;
+	nor->controller_ops = &hisi_controller_ops;
 
-	nor->prepare = hisi_spi_nor_prep;
-	nor->unprepare = hisi_spi_nor_unprep;
-	nor->read_reg = hisi_spi_nor_read_reg;
-	nor->write_reg = hisi_spi_nor_write_reg;
-	nor->read = hisi_spi_nor_read;
-	nor->write = hisi_spi_nor_write;
-	nor->erase = NULL;
 	ret = spi_nor_scan(nor, NULL, &hwcaps);
 	if (ret)
 		return ret;
diff --git a/drivers/mtd/spi-nor/intel-spi-pci.c b/drivers/mtd/spi-nor/intel-spi-pci.c
index 3cda8e7a68f8..3d8987baea2a 100644
--- a/drivers/mtd/spi-nor/intel-spi-pci.c
+++ b/drivers/mtd/spi-nor/intel-spi-pci.c
@@ -20,6 +20,10 @@ static const struct intel_spi_boardinfo bxt_info = {
 	.type = INTEL_SPI_BXT,
 };
 
+static const struct intel_spi_boardinfo cnl_info = {
+	.type = INTEL_SPI_CNL,
+};
+
 static int intel_spi_pci_probe(struct pci_dev *pdev,
 			       const struct pci_device_id *id)
 {
@@ -61,6 +65,7 @@ static void intel_spi_pci_remove(struct pci_dev *pdev)
 
 static const struct pci_device_id intel_spi_pci_ids[] = {
 	{ PCI_VDEVICE(INTEL, 0x02a4), (unsigned long)&bxt_info },
+	{ PCI_VDEVICE(INTEL, 0x06a4), (unsigned long)&bxt_info },
 	{ PCI_VDEVICE(INTEL, 0x18e0), (unsigned long)&bxt_info },
 	{ PCI_VDEVICE(INTEL, 0x19e0), (unsigned long)&bxt_info },
 	{ PCI_VDEVICE(INTEL, 0x34a4), (unsigned long)&bxt_info },
@@ -68,6 +73,7 @@ static const struct pci_device_id intel_spi_pci_ids[] = {
 	{ PCI_VDEVICE(INTEL, 0xa0a4), (unsigned long)&bxt_info },
 	{ PCI_VDEVICE(INTEL, 0xa1a4), (unsigned long)&bxt_info },
 	{ PCI_VDEVICE(INTEL, 0xa224), (unsigned long)&bxt_info },
+	{ PCI_VDEVICE(INTEL, 0xa324), (unsigned long)&cnl_info },
 	{ },
 };
 MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids);
diff --git a/drivers/mtd/spi-nor/intel-spi.c b/drivers/mtd/spi-nor/intel-spi.c
index 43e55a2e9b27..61d2a0ad2131 100644
--- a/drivers/mtd/spi-nor/intel-spi.c
+++ b/drivers/mtd/spi-nor/intel-spi.c
@@ -108,6 +108,10 @@
 #define BXT_FREG_NUM			12
 #define BXT_PR_NUM			6
 
+#define CNL_PR				0x84
+#define CNL_FREG_NUM			6
+#define CNL_PR_NUM			5
+
 #define LVSCC				0xc4
 #define UVSCC				0xc8
 #define ERASE_OPCODE_SHIFT		8
@@ -187,12 +191,16 @@ static void intel_spi_dump_regs(struct intel_spi *ispi)
 		dev_dbg(ispi->dev, "PR(%d)=0x%08x\n", i,
 			readl(ispi->pregs + PR(i)));
 
-	value = readl(ispi->sregs + SSFSTS_CTL);
-	dev_dbg(ispi->dev, "SSFSTS_CTL=0x%08x\n", value);
-	dev_dbg(ispi->dev, "PREOP_OPTYPE=0x%08x\n",
-		readl(ispi->sregs + PREOP_OPTYPE));
-	dev_dbg(ispi->dev, "OPMENU0=0x%08x\n", readl(ispi->sregs + OPMENU0));
-	dev_dbg(ispi->dev, "OPMENU1=0x%08x\n", readl(ispi->sregs + OPMENU1));
+	if (ispi->sregs) {
+		value = readl(ispi->sregs + SSFSTS_CTL);
+		dev_dbg(ispi->dev, "SSFSTS_CTL=0x%08x\n", value);
+		dev_dbg(ispi->dev, "PREOP_OPTYPE=0x%08x\n",
+			readl(ispi->sregs + PREOP_OPTYPE));
+		dev_dbg(ispi->dev, "OPMENU0=0x%08x\n",
+			readl(ispi->sregs + OPMENU0));
+		dev_dbg(ispi->dev, "OPMENU1=0x%08x\n",
+			readl(ispi->sregs + OPMENU1));
+	}
 
 	if (ispi->info->type == INTEL_SPI_BYT)
 		dev_dbg(ispi->dev, "BCR=0x%08x\n", readl(ispi->base + BYT_BCR));
@@ -340,6 +348,13 @@ static int intel_spi_init(struct intel_spi *ispi)
 		ispi->erase_64k = true;
 		break;
 
+	case INTEL_SPI_CNL:
+		ispi->sregs = NULL;
+		ispi->pregs = ispi->base + CNL_PR;
+		ispi->nregions = CNL_FREG_NUM;
+		ispi->pr_num = CNL_PR_NUM;
+		break;
+
 	default:
 		return -EINVAL;
 	}
@@ -367,6 +382,11 @@ static int intel_spi_init(struct intel_spi *ispi)
 		    !(uvscc & ERASE_64K_OPCODE_MASK))
 			ispi->erase_64k = false;
 
+	if (ispi->sregs == NULL && (ispi->swseq_reg || ispi->swseq_erase)) {
+		dev_err(ispi->dev, "software sequencer not supported, but required\n");
+		return -EINVAL;
+	}
+
 	/*
 	 * Some controllers can only do basic operations using hardware
 	 * sequencer. All other operations are supposed to be carried out
@@ -383,7 +403,7 @@ static int intel_spi_init(struct intel_spi *ispi)
 	val = readl(ispi->base + HSFSTS_CTL);
 	ispi->locked = !!(val & HSFSTS_CTL_FLOCKDN);
 
-	if (ispi->locked) {
+	if (ispi->locked && ispi->sregs) {
 		/*
 		 * BIOS programs allowed opcodes and then locks down the
 		 * register. So read back what opcodes it decided to support.
@@ -426,7 +446,7 @@ static int intel_spi_opcode_index(struct intel_spi *ispi, u8 opcode, int optype)
 	return 0;
 }
 
-static int intel_spi_hw_cycle(struct intel_spi *ispi, u8 opcode, int len)
+static int intel_spi_hw_cycle(struct intel_spi *ispi, u8 opcode, size_t len)
 {
 	u32 val, status;
 	int ret;
@@ -469,7 +489,7 @@ static int intel_spi_hw_cycle(struct intel_spi *ispi, u8 opcode, int len)
 	return 0;
 }
 
-static int intel_spi_sw_cycle(struct intel_spi *ispi, u8 opcode, int len,
+static int intel_spi_sw_cycle(struct intel_spi *ispi, u8 opcode, size_t len,
 			      int optype)
 {
 	u32 val = 0, status;
@@ -535,7 +555,8 @@ static int intel_spi_sw_cycle(struct intel_spi *ispi, u8 opcode, int len,
 	return 0;
 }
 
-static int intel_spi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+static int intel_spi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
+			      size_t len)
 {
 	struct intel_spi *ispi = nor->priv;
 	int ret;
@@ -555,7 +576,8 @@ static int intel_spi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
 	return intel_spi_read_block(ispi, buf, len);
 }
 
-static int intel_spi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+static int intel_spi_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
+			       size_t len)
 {
 	struct intel_spi *ispi = nor->priv;
 	int ret;
@@ -864,6 +886,14 @@ static void intel_spi_fill_partition(struct intel_spi *ispi,
 	}
 }
 
+static const struct spi_nor_controller_ops intel_spi_controller_ops = {
+	.read_reg = intel_spi_read_reg,
+	.write_reg = intel_spi_write_reg,
+	.read = intel_spi_read,
+	.write = intel_spi_write,
+	.erase = intel_spi_erase,
+};
+
 struct intel_spi *intel_spi_probe(struct device *dev,
 	struct resource *mem, const struct intel_spi_boardinfo *info)
 {
@@ -897,11 +927,7 @@ struct intel_spi *intel_spi_probe(struct device *dev,
 
 	ispi->nor.dev = ispi->dev;
 	ispi->nor.priv = ispi;
-	ispi->nor.read_reg = intel_spi_read_reg;
-	ispi->nor.write_reg = intel_spi_write_reg;
-	ispi->nor.read = intel_spi_read;
-	ispi->nor.write = intel_spi_write;
-	ispi->nor.erase = intel_spi_erase;
+	ispi->nor.controller_ops = &intel_spi_controller_ops;
 
 	ret = spi_nor_scan(&ispi->nor, NULL, &hwcaps);
 	if (ret) {
diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c
index 34db01ab6cab..b1691680d174 100644
--- a/drivers/mtd/spi-nor/mtk-quadspi.c
+++ b/drivers/mtd/spi-nor/mtk-quadspi.c
@@ -151,9 +151,9 @@ static int mtk_nor_execute_cmd(struct mtk_nor *mtk_nor, u8 cmdval)
 }
 
 static int mtk_nor_do_tx_rx(struct mtk_nor *mtk_nor, u8 op,
-			    u8 *tx, int txlen, u8 *rx, int rxlen)
+			    const u8 *tx, size_t txlen, u8 *rx, size_t rxlen)
 {
-	int len = 1 + txlen + rxlen;
+	size_t len = 1 + txlen + rxlen;
 	int i, ret, idx;
 
 	if (len > MTK_NOR_MAX_SHIFT)
@@ -193,7 +193,7 @@ static int mtk_nor_do_tx_rx(struct mtk_nor *mtk_nor, u8 op,
 }
 
 /* Do a WRSR (Write Status Register) command */
-static int mtk_nor_wr_sr(struct mtk_nor *mtk_nor, u8 sr)
+static int mtk_nor_wr_sr(struct mtk_nor *mtk_nor, const u8 sr)
 {
 	writeb(sr, mtk_nor->base + MTK_NOR_PRGDATA5_REG);
 	writeb(8, mtk_nor->base + MTK_NOR_CNT_REG);
@@ -354,7 +354,7 @@ static ssize_t mtk_nor_write(struct spi_nor *nor, loff_t to, size_t len,
 	return len;
 }
 
-static int mtk_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+static int mtk_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, size_t len)
 {
 	int ret;
 	struct mtk_nor *mtk_nor = nor->priv;
@@ -376,8 +376,8 @@ static int mtk_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
 	return ret;
 }
 
-static int mtk_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
-			     int len)
+static int mtk_nor_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
+			     size_t len)
 {
 	int ret;
 	struct mtk_nor *mtk_nor = nor->priv;
@@ -419,6 +419,13 @@ static int mtk_nor_enable_clk(struct mtk_nor *mtk_nor)
 	return 0;
 }
 
+static const struct spi_nor_controller_ops mtk_controller_ops = {
+	.read_reg = mtk_nor_read_reg,
+	.write_reg = mtk_nor_write_reg,
+	.read = mtk_nor_read,
+	.write = mtk_nor_write,
+};
+
 static int mtk_nor_init(struct mtk_nor *mtk_nor,
 			struct device_node *flash_node)
 {
@@ -438,12 +445,8 @@ static int mtk_nor_init(struct mtk_nor *mtk_nor,
 	nor->dev = mtk_nor->dev;
 	nor->priv = mtk_nor;
 	spi_nor_set_flash_node(nor, flash_node);
+	nor->controller_ops = &mtk_controller_ops;
 
-	/* fill the hooks to spi nor */
-	nor->read = mtk_nor_read;
-	nor->read_reg = mtk_nor_read_reg;
-	nor->write = mtk_nor_write;
-	nor->write_reg = mtk_nor_write_reg;
 	nor->mtd.name = "mtk_nor";
 	/* initialized with NULL */
 	ret = spi_nor_scan(nor, NULL, &hwcaps);
diff --git a/drivers/mtd/spi-nor/nxp-spifi.c b/drivers/mtd/spi-nor/nxp-spifi.c
index 4a871587392b..9a5b1a7c636a 100644
--- a/drivers/mtd/spi-nor/nxp-spifi.c
+++ b/drivers/mtd/spi-nor/nxp-spifi.c
@@ -123,7 +123,8 @@ static int nxp_spifi_set_memory_mode_on(struct nxp_spifi *spifi)
 	return ret;
 }
 
-static int nxp_spifi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+static int nxp_spifi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
+			      size_t len)
 {
 	struct nxp_spifi *spifi = nor->priv;
 	u32 cmd;
@@ -145,7 +146,8 @@ static int nxp_spifi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
 	return nxp_spifi_wait_for_cmd(spifi);
 }
 
-static int nxp_spifi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+static int nxp_spifi_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
+			       size_t len)
 {
 	struct nxp_spifi *spifi = nor->priv;
 	u32 cmd;
@@ -263,9 +265,18 @@ static int nxp_spifi_setup_memory_cmd(struct nxp_spifi *spifi)
 static void nxp_spifi_dummy_id_read(struct spi_nor *nor)
 {
 	u8 id[SPI_NOR_MAX_ID_LEN];
-	nor->read_reg(nor, SPINOR_OP_RDID, id, SPI_NOR_MAX_ID_LEN);
+	nor->controller_ops->read_reg(nor, SPINOR_OP_RDID, id,
+				      SPI_NOR_MAX_ID_LEN);
 }
 
+static const struct spi_nor_controller_ops nxp_spifi_controller_ops = {
+	.read_reg  = nxp_spifi_read_reg,
+	.write_reg = nxp_spifi_write_reg,
+	.read  = nxp_spifi_read,
+	.write = nxp_spifi_write,
+	.erase = nxp_spifi_erase,
+};
+
 static int nxp_spifi_setup_flash(struct nxp_spifi *spifi,
 				 struct device_node *np)
 {
@@ -332,11 +343,7 @@ static int nxp_spifi_setup_flash(struct nxp_spifi *spifi,
 	spifi->nor.dev   = spifi->dev;
 	spi_nor_set_flash_node(&spifi->nor, np);
 	spifi->nor.priv  = spifi;
-	spifi->nor.read  = nxp_spifi_read;
-	spifi->nor.write = nxp_spifi_write;
-	spifi->nor.erase = nxp_spifi_erase;
-	spifi->nor.read_reg  = nxp_spifi_read_reg;
-	spifi->nor.write_reg = nxp_spifi_write_reg;
+	spifi->nor.controller_ops = &nxp_spifi_controller_ops;
 
 	/*
 	 * The first read on a hard reset isn't reliable so do a
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 7acf4a93b592..f4afe123e9dc 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -338,7 +338,7 @@ static ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len,
 	if (nor->spimem)
 		return spi_nor_spimem_read_data(nor, from, len, buf);
 
-	return nor->read(nor, from, len, buf);
+	return nor->controller_ops->read(nor, from, len, buf);
 }
 
 /**
@@ -385,239 +385,172 @@ static ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len,
 	if (nor->spimem)
 		return spi_nor_spimem_write_data(nor, to, len, buf);
 
-	return nor->write(nor, to, len, buf);
+	return nor->controller_ops->write(nor, to, len, buf);
 }
 
-/*
- * Read the status register, returning its value in the location
- * Return the status register value.
- * Returns negative if error occurred.
+/**
+ * spi_nor_write_enable() - Set write enable latch with Write Enable command.
+ * @nor:	pointer to 'struct spi_nor'.
+ *
+ * Return: 0 on success, -errno otherwise.
  */
-static int read_sr(struct spi_nor *nor)
+static int spi_nor_write_enable(struct spi_nor *nor)
 {
 	int ret;
 
 	if (nor->spimem) {
 		struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDSR, 1),
+			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WREN, 1),
 				   SPI_MEM_OP_NO_ADDR,
 				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_DATA_IN(1, nor->bouncebuf, 1));
+				   SPI_MEM_OP_NO_DATA);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else {
-		ret = nor->read_reg(nor, SPINOR_OP_RDSR, nor->bouncebuf, 1);
+		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WREN,
+						     NULL, 0);
 	}
 
-	if (ret < 0) {
-		pr_err("error %d reading SR\n", (int) ret);
-		return ret;
-	}
+	if (ret)
+		dev_dbg(nor->dev, "error %d on Write Enable\n", ret);
 
-	return nor->bouncebuf[0];
+	return ret;
 }
 
-/*
- * Read the flag status register, returning its value in the location
- * Return the status register value.
- * Returns negative if error occurred.
+/**
+ * spi_nor_write_disable() - Send Write Disable instruction to the chip.
+ * @nor:	pointer to 'struct spi_nor'.
+ *
+ * Return: 0 on success, -errno otherwise.
  */
-static int read_fsr(struct spi_nor *nor)
+static int spi_nor_write_disable(struct spi_nor *nor)
 {
 	int ret;
 
 	if (nor->spimem) {
 		struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDFSR, 1),
+			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRDI, 1),
 				   SPI_MEM_OP_NO_ADDR,
 				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_DATA_IN(1, nor->bouncebuf, 1));
+				   SPI_MEM_OP_NO_DATA);
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else {
-		ret = nor->read_reg(nor, SPINOR_OP_RDFSR, nor->bouncebuf, 1);
+		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WRDI,
+						     NULL, 0);
 	}
 
-	if (ret < 0) {
-		pr_err("error %d reading FSR\n", ret);
-		return ret;
-	}
+	if (ret)
+		dev_dbg(nor->dev, "error %d on Write Disable\n", ret);
 
-	return nor->bouncebuf[0];
+	return ret;
 }
 
-/*
- * Read configuration register, returning its value in the
- * location. Return the configuration register value.
- * Returns negative if error occurred.
+/**
+ * spi_nor_read_sr() - Read the Status Register.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @sr:		pointer to a DMA-able buffer where the value of the
+ *              Status Register will be written.
+ *
+ * Return: 0 on success, -errno otherwise.
  */
-static int read_cr(struct spi_nor *nor)
+static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
 {
 	int ret;
 
 	if (nor->spimem) {
 		struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDCR, 1),
+			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDSR, 1),
 				   SPI_MEM_OP_NO_ADDR,
 				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_DATA_IN(1, nor->bouncebuf, 1));
+				   SPI_MEM_OP_DATA_IN(1, sr, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else {
-		ret = nor->read_reg(nor, SPINOR_OP_RDCR, nor->bouncebuf, 1);
+		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDSR,
+						    sr, 1);
 	}
 
-	if (ret < 0) {
-		dev_err(nor->dev, "error %d reading CR\n", ret);
-		return ret;
-	}
+	if (ret)
+		dev_dbg(nor->dev, "error %d reading SR\n", ret);
 
-	return nor->bouncebuf[0];
+	return ret;
 }
 
-/*
- * Write status register 1 byte
- * Returns negative if error occurred.
+/**
+ * spi_nor_read_fsr() - Read the Flag Status Register.
+ * @nor:	pointer to 'struct spi_nor'
+ * @fsr:	pointer to a DMA-able buffer where the value of the
+ *              Flag Status Register will be written.
+ *
+ * Return: 0 on success, -errno otherwise.
  */
-static int write_sr(struct spi_nor *nor, u8 val)
+static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
 {
-	nor->bouncebuf[0] = val;
-	if (nor->spimem) {
-		struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRSR, 1),
-				   SPI_MEM_OP_NO_ADDR,
-				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_DATA_OUT(1, nor->bouncebuf, 1));
-
-		return spi_mem_exec_op(nor->spimem, &op);
-	}
-
-	return nor->write_reg(nor, SPINOR_OP_WRSR, nor->bouncebuf, 1);
-}
+	int ret;
 
-/*
- * Set write enable latch with Write Enable command.
- * Returns negative if error occurred.
- */
-static int write_enable(struct spi_nor *nor)
-{
 	if (nor->spimem) {
 		struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WREN, 1),
+			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDFSR, 1),
 				   SPI_MEM_OP_NO_ADDR,
 				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_NO_DATA);
+				   SPI_MEM_OP_DATA_IN(1, fsr, 1));
 
-		return spi_mem_exec_op(nor->spimem, &op);
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDFSR,
+						    fsr, 1);
 	}
 
-	return nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
+	if (ret)
+		dev_dbg(nor->dev, "error %d reading FSR\n", ret);
+
+	return ret;
 }
 
-/*
- * Send write disable instruction to the chip.
+/**
+ * spi_nor_read_cr() - Read the Configuration Register using the
+ * SPINOR_OP_RDCR (35h) command.
+ * @nor:	pointer to 'struct spi_nor'
+ * @cr:		pointer to a DMA-able buffer where the value of the
+ *              Configuration Register will be written.
+ *
+ * Return: 0 on success, -errno otherwise.
  */
-static int write_disable(struct spi_nor *nor)
+static int spi_nor_read_cr(struct spi_nor *nor, u8 *cr)
 {
+	int ret;
+
 	if (nor->spimem) {
 		struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRDI, 1),
+			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDCR, 1),
 				   SPI_MEM_OP_NO_ADDR,
 				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_NO_DATA);
+				   SPI_MEM_OP_DATA_IN(1, cr, 1));
 
-		return spi_mem_exec_op(nor->spimem, &op);
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDCR, cr, 1);
 	}
 
-	return nor->write_reg(nor, SPINOR_OP_WRDI, NULL, 0);
-}
-
-static struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
-{
-	return mtd->priv;
-}
-
-
-static u8 spi_nor_convert_opcode(u8 opcode, const u8 table[][2], size_t size)
-{
-	size_t i;
-
-	for (i = 0; i < size; i++)
-		if (table[i][0] == opcode)
-			return table[i][1];
-
-	/* No conversion found, keep input op code. */
-	return opcode;
-}
-
-static u8 spi_nor_convert_3to4_read(u8 opcode)
-{
-	static const u8 spi_nor_3to4_read[][2] = {
-		{ SPINOR_OP_READ,	SPINOR_OP_READ_4B },
-		{ SPINOR_OP_READ_FAST,	SPINOR_OP_READ_FAST_4B },
-		{ SPINOR_OP_READ_1_1_2,	SPINOR_OP_READ_1_1_2_4B },
-		{ SPINOR_OP_READ_1_2_2,	SPINOR_OP_READ_1_2_2_4B },
-		{ SPINOR_OP_READ_1_1_4,	SPINOR_OP_READ_1_1_4_4B },
-		{ SPINOR_OP_READ_1_4_4,	SPINOR_OP_READ_1_4_4_4B },
-		{ SPINOR_OP_READ_1_1_8,	SPINOR_OP_READ_1_1_8_4B },
-		{ SPINOR_OP_READ_1_8_8,	SPINOR_OP_READ_1_8_8_4B },
-
-		{ SPINOR_OP_READ_1_1_1_DTR,	SPINOR_OP_READ_1_1_1_DTR_4B },
-		{ SPINOR_OP_READ_1_2_2_DTR,	SPINOR_OP_READ_1_2_2_DTR_4B },
-		{ SPINOR_OP_READ_1_4_4_DTR,	SPINOR_OP_READ_1_4_4_DTR_4B },
-	};
-
-	return spi_nor_convert_opcode(opcode, spi_nor_3to4_read,
-				      ARRAY_SIZE(spi_nor_3to4_read));
-}
-
-static u8 spi_nor_convert_3to4_program(u8 opcode)
-{
-	static const u8 spi_nor_3to4_program[][2] = {
-		{ SPINOR_OP_PP,		SPINOR_OP_PP_4B },
-		{ SPINOR_OP_PP_1_1_4,	SPINOR_OP_PP_1_1_4_4B },
-		{ SPINOR_OP_PP_1_4_4,	SPINOR_OP_PP_1_4_4_4B },
-		{ SPINOR_OP_PP_1_1_8,	SPINOR_OP_PP_1_1_8_4B },
-		{ SPINOR_OP_PP_1_8_8,	SPINOR_OP_PP_1_8_8_4B },
-	};
-
-	return spi_nor_convert_opcode(opcode, spi_nor_3to4_program,
-				      ARRAY_SIZE(spi_nor_3to4_program));
-}
-
-static u8 spi_nor_convert_3to4_erase(u8 opcode)
-{
-	static const u8 spi_nor_3to4_erase[][2] = {
-		{ SPINOR_OP_BE_4K,	SPINOR_OP_BE_4K_4B },
-		{ SPINOR_OP_BE_32K,	SPINOR_OP_BE_32K_4B },
-		{ SPINOR_OP_SE,		SPINOR_OP_SE_4B },
-	};
-
-	return spi_nor_convert_opcode(opcode, spi_nor_3to4_erase,
-				      ARRAY_SIZE(spi_nor_3to4_erase));
-}
-
-static void spi_nor_set_4byte_opcodes(struct spi_nor *nor)
-{
-	nor->read_opcode = spi_nor_convert_3to4_read(nor->read_opcode);
-	nor->program_opcode = spi_nor_convert_3to4_program(nor->program_opcode);
-	nor->erase_opcode = spi_nor_convert_3to4_erase(nor->erase_opcode);
-
-	if (!spi_nor_has_uniform_erase(nor)) {
-		struct spi_nor_erase_map *map = &nor->params.erase_map;
-		struct spi_nor_erase_type *erase;
-		int i;
+	if (ret)
+		dev_dbg(nor->dev, "error %d reading CR\n", ret);
 
-		for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
-			erase = &map->erase_type[i];
-			erase->opcode =
-				spi_nor_convert_3to4_erase(erase->opcode);
-		}
-	}
+	return ret;
 }
 
+/**
+ * macronix_set_4byte() - Set 4-byte address mode for Macronix flashes.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @enable:	true to enter the 4-byte address mode, false to exit the 4-byte
+ *		address mode.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int macronix_set_4byte(struct spi_nor *nor, bool enable)
 {
+	int ret;
+
 	if (nor->spimem) {
 		struct spi_mem_op op =
 			SPI_MEM_OP(SPI_MEM_OP_CMD(enable ?
@@ -628,26 +561,55 @@ static int macronix_set_4byte(struct spi_nor *nor, bool enable)
 				  SPI_MEM_OP_NO_DUMMY,
 				  SPI_MEM_OP_NO_DATA);
 
-		return spi_mem_exec_op(nor->spimem, &op);
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->write_reg(nor,
+						     enable ? SPINOR_OP_EN4B :
+							      SPINOR_OP_EX4B,
+						     NULL, 0);
 	}
 
-	return nor->write_reg(nor, enable ? SPINOR_OP_EN4B : SPINOR_OP_EX4B,
-			      NULL, 0);
+	if (ret)
+		dev_dbg(nor->dev, "error %d setting 4-byte mode\n", ret);
+
+	return ret;
 }
 
+/**
+ * st_micron_set_4byte() - Set 4-byte address mode for ST and Micron flashes.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @enable:	true to enter the 4-byte address mode, false to exit the 4-byte
+ *		address mode.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int st_micron_set_4byte(struct spi_nor *nor, bool enable)
 {
 	int ret;
 
-	write_enable(nor);
+	ret = spi_nor_write_enable(nor);
+	if (ret)
+		return ret;
+
 	ret = macronix_set_4byte(nor, enable);
-	write_disable(nor);
+	if (ret)
+		return ret;
 
-	return ret;
+	return spi_nor_write_disable(nor);
 }
 
+/**
+ * spansion_set_4byte() - Set 4-byte address mode for Spansion flashes.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @enable:	true to enter the 4-byte address mode, false to exit the 4-byte
+ *		address mode.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int spansion_set_4byte(struct spi_nor *nor, bool enable)
 {
+	int ret;
+
 	nor->bouncebuf[0] = enable << 7;
 
 	if (nor->spimem) {
@@ -657,14 +619,29 @@ static int spansion_set_4byte(struct spi_nor *nor, bool enable)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_OUT(1, nor->bouncebuf, 1));
 
-		return spi_mem_exec_op(nor->spimem, &op);
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_BRWR,
+						     nor->bouncebuf, 1);
 	}
 
-	return nor->write_reg(nor, SPINOR_OP_BRWR, nor->bouncebuf, 1);
+	if (ret)
+		dev_dbg(nor->dev, "error %d setting 4-byte mode\n", ret);
+
+	return ret;
 }
 
+/**
+ * spi_nor_write_ear() - Write Extended Address Register.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @ear:	value to write to the Extended Address Register.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int spi_nor_write_ear(struct spi_nor *nor, u8 ear)
 {
+	int ret;
+
 	nor->bouncebuf[0] = ear;
 
 	if (nor->spimem) {
@@ -674,12 +651,26 @@ static int spi_nor_write_ear(struct spi_nor *nor, u8 ear)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_OUT(1, nor->bouncebuf, 1));
 
-		return spi_mem_exec_op(nor->spimem, &op);
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WREAR,
+						     nor->bouncebuf, 1);
 	}
 
-	return nor->write_reg(nor, SPINOR_OP_WREAR, nor->bouncebuf, 1);
+	if (ret)
+		dev_dbg(nor->dev, "error %d writing EAR\n", ret);
+
+	return ret;
 }
 
+/**
+ * winbond_set_4byte() - Set 4-byte address mode for Winbond flashes.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @enable:	true to enter the 4-byte address mode, false to exit the 4-byte
+ *		address mode.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int winbond_set_4byte(struct spi_nor *nor, bool enable)
 {
 	int ret;
@@ -693,15 +684,29 @@ static int winbond_set_4byte(struct spi_nor *nor, bool enable)
 	 * Register to be set to 1, so all 3-byte-address reads come from the
 	 * second 16M. We must clear the register to enable normal behavior.
 	 */
-	write_enable(nor);
+	ret = spi_nor_write_enable(nor);
+	if (ret)
+		return ret;
+
 	ret = spi_nor_write_ear(nor, 0);
-	write_disable(nor);
+	if (ret)
+		return ret;
 
-	return ret;
+	return spi_nor_write_disable(nor);
 }
 
+/**
+ * spi_nor_xread_sr() - Read the Status Register on S3AN flashes.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @sr:		pointer to a DMA-able buffer where the value of the
+ *              Status Register will be written.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int spi_nor_xread_sr(struct spi_nor *nor, u8 *sr)
 {
+	int ret;
+
 	if (nor->spimem) {
 		struct spi_mem_op op =
 			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_XRDSR, 1),
@@ -709,27 +714,44 @@ static int spi_nor_xread_sr(struct spi_nor *nor, u8 *sr)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(1, sr, 1));
 
-		return spi_mem_exec_op(nor->spimem, &op);
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_XRDSR,
+						    sr, 1);
 	}
 
-	return nor->read_reg(nor, SPINOR_OP_XRDSR, sr, 1);
+	if (ret)
+		dev_dbg(nor->dev, "error %d reading XRDSR\n", ret);
+
+	return ret;
 }
 
+/**
+ * s3an_sr_ready() - Query the Status Register of the S3AN flash to see if the
+ * flash is ready for new commands.
+ * @nor:	pointer to 'struct spi_nor'.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int s3an_sr_ready(struct spi_nor *nor)
 {
 	int ret;
 
 	ret = spi_nor_xread_sr(nor, nor->bouncebuf);
-	if (ret < 0) {
-		dev_err(nor->dev, "error %d reading XRDSR\n", (int) ret);
+	if (ret)
 		return ret;
-	}
 
 	return !!(nor->bouncebuf[0] & XSR_RDY);
 }
 
-static int spi_nor_clear_sr(struct spi_nor *nor)
+/**
+ * spi_nor_clear_sr() - Clear the Status Register.
+ * @nor:	pointer to 'struct spi_nor'.
+ */
+static void spi_nor_clear_sr(struct spi_nor *nor)
 {
+	int ret;
+
 	if (nor->spimem) {
 		struct spi_mem_op op =
 			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_CLSR, 1),
@@ -737,20 +759,33 @@ static int spi_nor_clear_sr(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_NO_DATA);
 
-		return spi_mem_exec_op(nor->spimem, &op);
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_CLSR,
+						     NULL, 0);
 	}
 
-	return nor->write_reg(nor, SPINOR_OP_CLSR, NULL, 0);
+	if (ret)
+		dev_dbg(nor->dev, "error %d clearing SR\n", ret);
 }
 
+/**
+ * spi_nor_sr_ready() - Query the Status Register to see if the flash is ready
+ * for new commands.
+ * @nor:	pointer to 'struct spi_nor'.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int spi_nor_sr_ready(struct spi_nor *nor)
 {
-	int sr = read_sr(nor);
-	if (sr < 0)
-		return sr;
+	int ret = spi_nor_read_sr(nor, nor->bouncebuf);
+
+	if (ret)
+		return ret;
 
-	if (nor->flags & SNOR_F_USE_CLSR && sr & (SR_E_ERR | SR_P_ERR)) {
-		if (sr & SR_E_ERR)
+	if (nor->flags & SNOR_F_USE_CLSR &&
+	    nor->bouncebuf[0] & (SR_E_ERR | SR_P_ERR)) {
+		if (nor->bouncebuf[0] & SR_E_ERR)
 			dev_err(nor->dev, "Erase Error occurred\n");
 		else
 			dev_err(nor->dev, "Programming Error occurred\n");
@@ -759,11 +794,17 @@ static int spi_nor_sr_ready(struct spi_nor *nor)
 		return -EIO;
 	}
 
-	return !(sr & SR_WIP);
+	return !(nor->bouncebuf[0] & SR_WIP);
 }
 
-static int spi_nor_clear_fsr(struct spi_nor *nor)
+/**
+ * spi_nor_clear_fsr() - Clear the Flag Status Register.
+ * @nor:	pointer to 'struct spi_nor'.
+ */
+static void spi_nor_clear_fsr(struct spi_nor *nor)
 {
+	int ret;
+
 	if (nor->spimem) {
 		struct spi_mem_op op =
 			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_CLFSR, 1),
@@ -771,25 +812,37 @@ static int spi_nor_clear_fsr(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_NO_DATA);
 
-		return spi_mem_exec_op(nor->spimem, &op);
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_CLFSR,
+						     NULL, 0);
 	}
 
-	return nor->write_reg(nor, SPINOR_OP_CLFSR, NULL, 0);
+	if (ret)
+		dev_dbg(nor->dev, "error %d clearing FSR\n", ret);
 }
 
+/**
+ * spi_nor_fsr_ready() - Query the Flag Status Register to see if the flash is
+ * ready for new commands.
+ * @nor:	pointer to 'struct spi_nor'.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int spi_nor_fsr_ready(struct spi_nor *nor)
 {
-	int fsr = read_fsr(nor);
-	if (fsr < 0)
-		return fsr;
+	int ret = spi_nor_read_fsr(nor, nor->bouncebuf);
 
-	if (fsr & (FSR_E_ERR | FSR_P_ERR)) {
-		if (fsr & FSR_E_ERR)
+	if (ret)
+		return ret;
+
+	if (nor->bouncebuf[0] & (FSR_E_ERR | FSR_P_ERR)) {
+		if (nor->bouncebuf[0] & FSR_E_ERR)
 			dev_err(nor->dev, "Erase operation failed.\n");
 		else
 			dev_err(nor->dev, "Program operation failed.\n");
 
-		if (fsr & FSR_PT_ERR)
+		if (nor->bouncebuf[0] & FSR_PT_ERR)
 			dev_err(nor->dev,
 			"Attempted to modify a protected sector.\n");
 
@@ -797,9 +850,15 @@ static int spi_nor_fsr_ready(struct spi_nor *nor)
 		return -EIO;
 	}
 
-	return fsr & FSR_READY;
+	return nor->bouncebuf[0] & FSR_READY;
 }
 
+/**
+ * spi_nor_ready() - Query the flash to see if it is ready for new commands.
+ * @nor:	pointer to 'struct spi_nor'.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int spi_nor_ready(struct spi_nor *nor)
 {
 	int sr, fsr;
@@ -816,9 +875,13 @@ static int spi_nor_ready(struct spi_nor *nor)
 	return sr && fsr;
 }
 
-/*
- * Service routine to read status register until ready, or timeout occurs.
- * Returns non-zero if error.
+/**
+ * spi_nor_wait_till_ready_with_timeout() - Service routine to read the
+ * Status Register until ready, or timeout occurs.
+ * @nor:		pointer to "struct spi_nor".
+ * @timeout_jiffies:	jiffies to wait until timeout.
+ *
+ * Return: 0 on success, -errno otherwise.
  */
 static int spi_nor_wait_till_ready_with_timeout(struct spi_nor *nor,
 						unsigned long timeout_jiffies)
@@ -841,24 +904,305 @@ static int spi_nor_wait_till_ready_with_timeout(struct spi_nor *nor,
 		cond_resched();
 	}
 
-	dev_err(nor->dev, "flash operation timed out\n");
+	dev_dbg(nor->dev, "flash operation timed out\n");
 
 	return -ETIMEDOUT;
 }
 
+/**
+ * spi_nor_wait_till_ready() - Wait for a predefined amount of time for the
+ * flash to be ready, or timeout occurs.
+ * @nor:	pointer to "struct spi_nor".
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
 static int spi_nor_wait_till_ready(struct spi_nor *nor)
 {
 	return spi_nor_wait_till_ready_with_timeout(nor,
 						    DEFAULT_READY_WAIT_JIFFIES);
 }
 
-/*
- * Erase the whole flash memory
+/**
+ * spi_nor_write_sr() - Write the Status Register.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @sr:		pointer to DMA-able buffer to write to the Status Register.
+ * @len:	number of bytes to write to the Status Register.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len)
+{
+	int ret;
+
+	ret = spi_nor_write_enable(nor);
+	if (ret)
+		return ret;
+
+	if (nor->spimem) {
+		struct spi_mem_op op =
+			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRSR, 1),
+				   SPI_MEM_OP_NO_ADDR,
+				   SPI_MEM_OP_NO_DUMMY,
+				   SPI_MEM_OP_DATA_OUT(len, sr, 1));
+
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WRSR,
+						     sr, len);
+	}
+
+	if (ret) {
+		dev_dbg(nor->dev, "error %d writing SR\n", ret);
+		return ret;
+	}
+
+	return spi_nor_wait_till_ready(nor);
+}
+
+/**
+ * spi_nor_write_sr1_and_check() - Write one byte to the Status Register 1 and
+ * ensure that the byte written match the received value.
+ * @nor:	pointer to a 'struct spi_nor'.
+ * @sr1:	byte value to be written to the Status Register.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_write_sr1_and_check(struct spi_nor *nor, u8 sr1)
+{
+	int ret;
+
+	nor->bouncebuf[0] = sr1;
+
+	ret = spi_nor_write_sr(nor, nor->bouncebuf, 1);
+	if (ret)
+		return ret;
+
+	ret = spi_nor_read_sr(nor, nor->bouncebuf);
+	if (ret)
+		return ret;
+
+	if (nor->bouncebuf[0] != sr1) {
+		dev_dbg(nor->dev, "SR1: read back test failed\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/**
+ * spi_nor_write_16bit_sr_and_check() - Write the Status Register 1 and the
+ * Status Register 2 in one shot. Ensure that the byte written in the Status
+ * Register 1 match the received value, and that the 16-bit Write did not
+ * affect what was already in the Status Register 2.
+ * @nor:	pointer to a 'struct spi_nor'.
+ * @sr1:	byte value to be written to the Status Register 1.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_write_16bit_sr_and_check(struct spi_nor *nor, u8 sr1)
+{
+	int ret;
+	u8 *sr_cr = nor->bouncebuf;
+	u8 cr_written;
+
+	/* Make sure we don't overwrite the contents of Status Register 2. */
+	if (!(nor->flags & SNOR_F_NO_READ_CR)) {
+		ret = spi_nor_read_cr(nor, &sr_cr[1]);
+		if (ret)
+			return ret;
+	} else if (nor->params.quad_enable) {
+		/*
+		 * If the Status Register 2 Read command (35h) is not
+		 * supported, we should at least be sure we don't
+		 * change the value of the SR2 Quad Enable bit.
+		 *
+		 * We can safely assume that when the Quad Enable method is
+		 * set, the value of the QE bit is one, as a consequence of the
+		 * nor->params.quad_enable() call.
+		 *
+		 * We can safely assume that the Quad Enable bit is present in
+		 * the Status Register 2 at BIT(1). According to the JESD216
+		 * revB standard, BFPT DWORDS[15], bits 22:20, the 16-bit
+		 * Write Status (01h) command is available just for the cases
+		 * in which the QE bit is described in SR2 at BIT(1).
+		 */
+		sr_cr[1] = SR2_QUAD_EN_BIT1;
+	} else {
+		sr_cr[1] = 0;
+	}
+
+	sr_cr[0] = sr1;
+
+	ret = spi_nor_write_sr(nor, sr_cr, 2);
+	if (ret)
+		return ret;
+
+	if (nor->flags & SNOR_F_NO_READ_CR)
+		return 0;
+
+	cr_written = sr_cr[1];
+
+	ret = spi_nor_read_cr(nor, &sr_cr[1]);
+	if (ret)
+		return ret;
+
+	if (cr_written != sr_cr[1]) {
+		dev_dbg(nor->dev, "CR: read back test failed\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/**
+ * spi_nor_write_16bit_cr_and_check() - Write the Status Register 1 and the
+ * Configuration Register in one shot. Ensure that the byte written in the
+ * Configuration Register match the received value, and that the 16-bit Write
+ * did not affect what was already in the Status Register 1.
+ * @nor:	pointer to a 'struct spi_nor'.
+ * @cr:		byte value to be written to the Configuration Register.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_write_16bit_cr_and_check(struct spi_nor *nor, u8 cr)
+{
+	int ret;
+	u8 *sr_cr = nor->bouncebuf;
+	u8 sr_written;
+
+	/* Keep the current value of the Status Register 1. */
+	ret = spi_nor_read_sr(nor, sr_cr);
+	if (ret)
+		return ret;
+
+	sr_cr[1] = cr;
+
+	ret = spi_nor_write_sr(nor, sr_cr, 2);
+	if (ret)
+		return ret;
+
+	sr_written = sr_cr[0];
+
+	ret = spi_nor_read_sr(nor, sr_cr);
+	if (ret)
+		return ret;
+
+	if (sr_written != sr_cr[0]) {
+		dev_dbg(nor->dev, "SR: Read back test failed\n");
+		return -EIO;
+	}
+
+	if (nor->flags & SNOR_F_NO_READ_CR)
+		return 0;
+
+	ret = spi_nor_read_cr(nor, &sr_cr[1]);
+	if (ret)
+		return ret;
+
+	if (cr != sr_cr[1]) {
+		dev_dbg(nor->dev, "CR: read back test failed\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/**
+ * spi_nor_write_sr_and_check() - Write the Status Register 1 and ensure that
+ * the byte written match the received value without affecting other bits in the
+ * Status Register 1 and 2.
+ * @nor:	pointer to a 'struct spi_nor'.
+ * @sr1:	byte value to be written to the Status Register.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 sr1)
+{
+	if (nor->flags & SNOR_F_HAS_16BIT_SR)
+		return spi_nor_write_16bit_sr_and_check(nor, sr1);
+
+	return spi_nor_write_sr1_and_check(nor, sr1);
+}
+
+/**
+ * spi_nor_write_sr2() - Write the Status Register 2 using the
+ * SPINOR_OP_WRSR2 (3eh) command.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @sr2:	pointer to DMA-able buffer to write to the Status Register 2.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_write_sr2(struct spi_nor *nor, const u8 *sr2)
+{
+	int ret;
+
+	ret = spi_nor_write_enable(nor);
+	if (ret)
+		return ret;
+
+	if (nor->spimem) {
+		struct spi_mem_op op =
+			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRSR2, 1),
+				   SPI_MEM_OP_NO_ADDR,
+				   SPI_MEM_OP_NO_DUMMY,
+				   SPI_MEM_OP_DATA_OUT(1, sr2, 1));
+
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WRSR2,
+						     sr2, 1);
+	}
+
+	if (ret) {
+		dev_dbg(nor->dev, "error %d writing SR2\n", ret);
+		return ret;
+	}
+
+	return spi_nor_wait_till_ready(nor);
+}
+
+/**
+ * spi_nor_read_sr2() - Read the Status Register 2 using the
+ * SPINOR_OP_RDSR2 (3fh) command.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @sr2:	pointer to DMA-able buffer where the value of the
+ *		Status Register 2 will be written.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_read_sr2(struct spi_nor *nor, u8 *sr2)
+{
+	int ret;
+
+	if (nor->spimem) {
+		struct spi_mem_op op =
+			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDSR2, 1),
+				   SPI_MEM_OP_NO_ADDR,
+				   SPI_MEM_OP_NO_DUMMY,
+				   SPI_MEM_OP_DATA_IN(1, sr2, 1));
+
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDSR2,
+						    sr2, 1);
+	}
+
+	if (ret)
+		dev_dbg(nor->dev, "error %d reading SR2\n", ret);
+
+	return ret;
+}
+
+/**
+ * spi_nor_erase_chip() - Erase the entire flash memory.
+ * @nor:	pointer to 'struct spi_nor'.
  *
- * Returns 0 if successful, non-zero otherwise.
+ * Return: 0 on success, -errno otherwise.
  */
-static int erase_chip(struct spi_nor *nor)
+static int spi_nor_erase_chip(struct spi_nor *nor)
 {
+	int ret;
+
 	dev_dbg(nor->dev, " %lldKiB\n", (long long)(nor->mtd.size >> 10));
 
 	if (nor->spimem) {
@@ -868,10 +1212,99 @@ static int erase_chip(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_NO_DATA);
 
-		return spi_mem_exec_op(nor->spimem, &op);
+		ret = spi_mem_exec_op(nor->spimem, &op);
+	} else {
+		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_CHIP_ERASE,
+						     NULL, 0);
 	}
 
-	return nor->write_reg(nor, SPINOR_OP_CHIP_ERASE, NULL, 0);
+	if (ret)
+		dev_dbg(nor->dev, "error %d erasing chip\n", ret);
+
+	return ret;
+}
+
+static struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
+{
+	return mtd->priv;
+}
+
+static u8 spi_nor_convert_opcode(u8 opcode, const u8 table[][2], size_t size)
+{
+	size_t i;
+
+	for (i = 0; i < size; i++)
+		if (table[i][0] == opcode)
+			return table[i][1];
+
+	/* No conversion found, keep input op code. */
+	return opcode;
+}
+
+static u8 spi_nor_convert_3to4_read(u8 opcode)
+{
+	static const u8 spi_nor_3to4_read[][2] = {
+		{ SPINOR_OP_READ,	SPINOR_OP_READ_4B },
+		{ SPINOR_OP_READ_FAST,	SPINOR_OP_READ_FAST_4B },
+		{ SPINOR_OP_READ_1_1_2,	SPINOR_OP_READ_1_1_2_4B },
+		{ SPINOR_OP_READ_1_2_2,	SPINOR_OP_READ_1_2_2_4B },
+		{ SPINOR_OP_READ_1_1_4,	SPINOR_OP_READ_1_1_4_4B },
+		{ SPINOR_OP_READ_1_4_4,	SPINOR_OP_READ_1_4_4_4B },
+		{ SPINOR_OP_READ_1_1_8,	SPINOR_OP_READ_1_1_8_4B },
+		{ SPINOR_OP_READ_1_8_8,	SPINOR_OP_READ_1_8_8_4B },
+
+		{ SPINOR_OP_READ_1_1_1_DTR,	SPINOR_OP_READ_1_1_1_DTR_4B },
+		{ SPINOR_OP_READ_1_2_2_DTR,	SPINOR_OP_READ_1_2_2_DTR_4B },
+		{ SPINOR_OP_READ_1_4_4_DTR,	SPINOR_OP_READ_1_4_4_DTR_4B },
+	};
+
+	return spi_nor_convert_opcode(opcode, spi_nor_3to4_read,
+				      ARRAY_SIZE(spi_nor_3to4_read));
+}
+
+static u8 spi_nor_convert_3to4_program(u8 opcode)
+{
+	static const u8 spi_nor_3to4_program[][2] = {
+		{ SPINOR_OP_PP,		SPINOR_OP_PP_4B },
+		{ SPINOR_OP_PP_1_1_4,	SPINOR_OP_PP_1_1_4_4B },
+		{ SPINOR_OP_PP_1_4_4,	SPINOR_OP_PP_1_4_4_4B },
+		{ SPINOR_OP_PP_1_1_8,	SPINOR_OP_PP_1_1_8_4B },
+		{ SPINOR_OP_PP_1_8_8,	SPINOR_OP_PP_1_8_8_4B },
+	};
+
+	return spi_nor_convert_opcode(opcode, spi_nor_3to4_program,
+				      ARRAY_SIZE(spi_nor_3to4_program));
+}
+
+static u8 spi_nor_convert_3to4_erase(u8 opcode)
+{
+	static const u8 spi_nor_3to4_erase[][2] = {
+		{ SPINOR_OP_BE_4K,	SPINOR_OP_BE_4K_4B },
+		{ SPINOR_OP_BE_32K,	SPINOR_OP_BE_32K_4B },
+		{ SPINOR_OP_SE,		SPINOR_OP_SE_4B },
+	};
+
+	return spi_nor_convert_opcode(opcode, spi_nor_3to4_erase,
+				      ARRAY_SIZE(spi_nor_3to4_erase));
+}
+
+static void spi_nor_set_4byte_opcodes(struct spi_nor *nor)
+{
+	nor->read_opcode = spi_nor_convert_3to4_read(nor->read_opcode);
+	nor->program_opcode = spi_nor_convert_3to4_program(nor->program_opcode);
+	nor->erase_opcode = spi_nor_convert_3to4_erase(nor->erase_opcode);
+
+	if (!spi_nor_has_uniform_erase(nor)) {
+		struct spi_nor_erase_map *map = &nor->params.erase_map;
+		struct spi_nor_erase_type *erase;
+		int i;
+
+		for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
+			erase = &map->erase_type[i];
+			erase->opcode =
+				spi_nor_convert_3to4_erase(erase->opcode);
+		}
+	}
 }
 
 static int spi_nor_lock_and_prep(struct spi_nor *nor, enum spi_nor_ops ops)
@@ -880,10 +1313,9 @@ static int spi_nor_lock_and_prep(struct spi_nor *nor, enum spi_nor_ops ops)
 
 	mutex_lock(&nor->lock);
 
-	if (nor->prepare) {
-		ret = nor->prepare(nor, ops);
+	if (nor->controller_ops &&  nor->controller_ops->prepare) {
+		ret = nor->controller_ops->prepare(nor, ops);
 		if (ret) {
-			dev_err(nor->dev, "failed in the preparation.\n");
 			mutex_unlock(&nor->lock);
 			return ret;
 		}
@@ -893,8 +1325,8 @@ static int spi_nor_lock_and_prep(struct spi_nor *nor, enum spi_nor_ops ops)
 
 static void spi_nor_unlock_and_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
 {
-	if (nor->unprepare)
-		nor->unprepare(nor, ops);
+	if (nor->controller_ops && nor->controller_ops->unprepare)
+		nor->controller_ops->unprepare(nor, ops);
 	mutex_unlock(&nor->lock);
 }
 
@@ -935,9 +1367,6 @@ static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
 
 	addr = spi_nor_convert_addr(nor, addr);
 
-	if (nor->erase)
-		return nor->erase(nor, addr);
-
 	if (nor->spimem) {
 		struct spi_mem_op op =
 			SPI_MEM_OP(SPI_MEM_OP_CMD(nor->erase_opcode, 1),
@@ -946,6 +1375,8 @@ static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
 				   SPI_MEM_OP_NO_DATA);
 
 		return spi_mem_exec_op(nor->spimem, &op);
+	} else if (nor->controller_ops->erase) {
+		return nor->controller_ops->erase(nor, addr);
 	}
 
 	/*
@@ -957,8 +1388,8 @@ static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
 		addr >>= 8;
 	}
 
-	return nor->write_reg(nor, nor->erase_opcode, nor->bouncebuf,
-			      nor->addr_width);
+	return nor->controller_ops->write_reg(nor, nor->erase_opcode,
+					      nor->bouncebuf, nor->addr_width);
 }
 
 /**
@@ -1208,7 +1639,9 @@ static int spi_nor_erase_multi_sectors(struct spi_nor *nor, u64 addr, u32 len)
 	list_for_each_entry_safe(cmd, next, &erase_list, list) {
 		nor->erase_opcode = cmd->opcode;
 		while (cmd->count) {
-			write_enable(nor);
+			ret = spi_nor_write_enable(nor);
+			if (ret)
+				goto destroy_erase_cmd_list;
 
 			ret = spi_nor_erase_sector(nor, addr);
 			if (ret)
@@ -1263,12 +1696,13 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
 	if (len == mtd->size && !(nor->flags & SNOR_F_NO_OP_CHIP_ERASE)) {
 		unsigned long timeout;
 
-		write_enable(nor);
+		ret = spi_nor_write_enable(nor);
+		if (ret)
+			goto erase_err;
 
-		if (erase_chip(nor)) {
-			ret = -EIO;
+		ret = spi_nor_erase_chip(nor);
+		if (ret)
 			goto erase_err;
-		}
 
 		/*
 		 * Scale the timeout linearly with the size of the flash, with
@@ -1291,7 +1725,9 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
 	/* "sector"-at-a-time erase */
 	} else if (spi_nor_has_uniform_erase(nor)) {
 		while (len) {
-			write_enable(nor);
+			ret = spi_nor_write_enable(nor);
+			if (ret)
+				goto erase_err;
 
 			ret = spi_nor_erase_sector(nor, addr);
 			if (ret)
@@ -1312,7 +1748,7 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
 			goto erase_err;
 	}
 
-	write_disable(nor);
+	ret = spi_nor_write_disable(nor);
 
 erase_err:
 	spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_ERASE);
@@ -1320,27 +1756,6 @@ erase_err:
 	return ret;
 }
 
-/* Write status register and ensure bits in mask match written values */
-static int write_sr_and_check(struct spi_nor *nor, u8 status_new, u8 mask)
-{
-	int ret;
-
-	write_enable(nor);
-	ret = write_sr(nor, status_new);
-	if (ret)
-		return ret;
-
-	ret = spi_nor_wait_till_ready(nor);
-	if (ret)
-		return ret;
-
-	ret = read_sr(nor);
-	if (ret < 0)
-		return ret;
-
-	return ((ret & mask) != (status_new & mask)) ? -EIO : 0;
-}
-
 static void stm_get_locked_range(struct spi_nor *nor, u8 sr, loff_t *ofs,
 				 uint64_t *len)
 {
@@ -1433,16 +1848,18 @@ static int stm_is_unlocked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len,
 static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
 {
 	struct mtd_info *mtd = &nor->mtd;
-	int status_old, status_new;
+	int ret, status_old, status_new;
 	u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
 	u8 shift = ffs(mask) - 1, pow, val;
 	loff_t lock_len;
 	bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB;
 	bool use_top;
 
-	status_old = read_sr(nor);
-	if (status_old < 0)
-		return status_old;
+	ret = spi_nor_read_sr(nor, nor->bouncebuf);
+	if (ret)
+		return ret;
+
+	status_old = nor->bouncebuf[0];
 
 	/* If nothing in our range is unlocked, we don't need to do anything */
 	if (stm_is_locked_sr(nor, ofs, len, status_old))
@@ -1502,7 +1919,7 @@ static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
 	if ((status_new & mask) < (status_old & mask))
 		return -EINVAL;
 
-	return write_sr_and_check(nor, status_new, mask);
+	return spi_nor_write_sr_and_check(nor, status_new);
 }
 
 /*
@@ -1513,16 +1930,18 @@ static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
 static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
 {
 	struct mtd_info *mtd = &nor->mtd;
-	int status_old, status_new;
+	int ret, status_old, status_new;
 	u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
 	u8 shift = ffs(mask) - 1, pow, val;
 	loff_t lock_len;
 	bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB;
 	bool use_top;
 
-	status_old = read_sr(nor);
-	if (status_old < 0)
-		return status_old;
+	ret = spi_nor_read_sr(nor, nor->bouncebuf);
+	if (ret)
+		return ret;
+
+	status_old = nor->bouncebuf[0];
 
 	/* If nothing in our range is locked, we don't need to do anything */
 	if (stm_is_unlocked_sr(nor, ofs, len, status_old))
@@ -1585,7 +2004,7 @@ static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
 	if ((status_new & mask) > (status_old & mask))
 		return -EINVAL;
 
-	return write_sr_and_check(nor, status_new, mask);
+	return spi_nor_write_sr_and_check(nor, status_new);
 }
 
 /*
@@ -1597,13 +2016,13 @@ static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
  */
 static int stm_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len)
 {
-	int status;
+	int ret;
 
-	status = read_sr(nor);
-	if (status < 0)
-		return status;
+	ret = spi_nor_read_sr(nor, nor->bouncebuf);
+	if (ret)
+		return ret;
 
-	return stm_is_locked_sr(nor, ofs, len, status);
+	return stm_is_locked_sr(nor, ofs, len, nor->bouncebuf[0]);
 }
 
 static const struct spi_nor_locking_ops stm_locking_ops = {
@@ -1657,242 +2076,59 @@ static int spi_nor_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 	return ret;
 }
 
-/*
- * Write status Register and configuration register with 2 bytes
- * The first byte will be written to the status register, while the
- * second byte will be written to the configuration register.
- * Return negative if error occurred.
- */
-static int write_sr_cr(struct spi_nor *nor, u8 *sr_cr)
-{
-	int ret;
-
-	write_enable(nor);
-
-	if (nor->spimem) {
-		struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRSR, 1),
-				   SPI_MEM_OP_NO_ADDR,
-				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_DATA_OUT(2, sr_cr, 1));
-
-		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->write_reg(nor, SPINOR_OP_WRSR, sr_cr, 2);
-	}
-
-	if (ret < 0) {
-		dev_err(nor->dev,
-			"error while writing configuration register\n");
-		return -EINVAL;
-	}
-
-	ret = spi_nor_wait_till_ready(nor);
-	if (ret) {
-		dev_err(nor->dev,
-			"timeout while writing configuration register\n");
-		return ret;
-	}
-
-	return 0;
-}
-
-/**
- * macronix_quad_enable() - set QE bit in Status Register.
- * @nor:	pointer to a 'struct spi_nor'
- *
- * Set the Quad Enable (QE) bit in the Status Register.
- *
- * bit 6 of the Status Register is the QE bit for Macronix like QSPI memories.
- *
- * Return: 0 on success, -errno otherwise.
- */
-static int macronix_quad_enable(struct spi_nor *nor)
-{
-	int ret, val;
-
-	val = read_sr(nor);
-	if (val < 0)
-		return val;
-	if (val & SR_QUAD_EN_MX)
-		return 0;
-
-	write_enable(nor);
-
-	write_sr(nor, val | SR_QUAD_EN_MX);
-
-	ret = spi_nor_wait_till_ready(nor);
-	if (ret)
-		return ret;
-
-	ret = read_sr(nor);
-	if (!(ret > 0 && (ret & SR_QUAD_EN_MX))) {
-		dev_err(nor->dev, "Macronix Quad bit not set\n");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
 /**
- * spansion_quad_enable() - set QE bit in Configuraiton Register.
+ * spi_nor_sr1_bit6_quad_enable() - Set the Quad Enable BIT(6) in the Status
+ * Register 1.
  * @nor:	pointer to a 'struct spi_nor'
  *
- * Set the Quad Enable (QE) bit in the Configuration Register.
- * This function is kept for legacy purpose because it has been used for a
- * long time without anybody complaining but it should be considered as
- * deprecated and maybe buggy.
- * First, this function doesn't care about the previous values of the Status
- * and Configuration Registers when it sets the QE bit (bit 1) in the
- * Configuration Register: all other bits are cleared, which may have unwanted
- * side effects like removing some block protections.
- * Secondly, it uses the Read Configuration Register (35h) instruction though
- * some very old and few memories don't support this instruction. If a pull-up
- * resistor is present on the MISO/IO1 line, we might still be able to pass the
- * "read back" test because the QSPI memory doesn't recognize the command,
- * so leaves the MISO/IO1 line state unchanged, hence read_cr() returns 0xFF.
- *
- * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI
- * memories.
+ * Bit 6 of the Status Register 1 is the QE bit for Macronix like QSPI memories.
  *
  * Return: 0 on success, -errno otherwise.
  */
-static int spansion_quad_enable(struct spi_nor *nor)
+static int spi_nor_sr1_bit6_quad_enable(struct spi_nor *nor)
 {
-	u8 *sr_cr = nor->bouncebuf;
 	int ret;
 
-	sr_cr[0] = 0;
-	sr_cr[1] = CR_QUAD_EN_SPAN;
-	ret = write_sr_cr(nor, sr_cr);
+	ret = spi_nor_read_sr(nor, nor->bouncebuf);
 	if (ret)
 		return ret;
 
-	/* read back and check it */
-	ret = read_cr(nor);
-	if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {
-		dev_err(nor->dev, "Spansion Quad bit not set\n");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-/**
- * spansion_no_read_cr_quad_enable() - set QE bit in Configuration Register.
- * @nor:	pointer to a 'struct spi_nor'
- *
- * Set the Quad Enable (QE) bit in the Configuration Register.
- * This function should be used with QSPI memories not supporting the Read
- * Configuration Register (35h) instruction.
- *
- * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI
- * memories.
- *
- * Return: 0 on success, -errno otherwise.
- */
-static int spansion_no_read_cr_quad_enable(struct spi_nor *nor)
-{
-	u8 *sr_cr = nor->bouncebuf;
-	int ret;
+	if (nor->bouncebuf[0] & SR1_QUAD_EN_BIT6)
+		return 0;
 
-	/* Keep the current value of the Status Register. */
-	ret = read_sr(nor);
-	if (ret < 0) {
-		dev_err(nor->dev, "error while reading status register\n");
-		return -EINVAL;
-	}
-	sr_cr[0] = ret;
-	sr_cr[1] = CR_QUAD_EN_SPAN;
+	nor->bouncebuf[0] |= SR1_QUAD_EN_BIT6;
 
-	return write_sr_cr(nor, sr_cr);
+	return spi_nor_write_sr1_and_check(nor, nor->bouncebuf[0]);
 }
 
 /**
- * spansion_read_cr_quad_enable() - set QE bit in Configuration Register.
- * @nor:	pointer to a 'struct spi_nor'
- *
- * Set the Quad Enable (QE) bit in the Configuration Register.
- * This function should be used with QSPI memories supporting the Read
- * Configuration Register (35h) instruction.
+ * spi_nor_sr2_bit1_quad_enable() - set the Quad Enable BIT(1) in the Status
+ * Register 2.
+ * @nor:       pointer to a 'struct spi_nor'.
  *
- * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI
- * memories.
+ * Bit 1 of the Status Register 2 is the QE bit for Spansion like QSPI memories.
  *
  * Return: 0 on success, -errno otherwise.
  */
-static int spansion_read_cr_quad_enable(struct spi_nor *nor)
+static int spi_nor_sr2_bit1_quad_enable(struct spi_nor *nor)
 {
-	struct device *dev = nor->dev;
-	u8 *sr_cr = nor->bouncebuf;
 	int ret;
 
-	/* Check current Quad Enable bit value. */
-	ret = read_cr(nor);
-	if (ret < 0) {
-		dev_err(dev, "error while reading configuration register\n");
-		return -EINVAL;
-	}
-
-	if (ret & CR_QUAD_EN_SPAN)
-		return 0;
+	if (nor->flags & SNOR_F_NO_READ_CR)
+		return spi_nor_write_16bit_cr_and_check(nor, SR2_QUAD_EN_BIT1);
 
-	sr_cr[1] = ret | CR_QUAD_EN_SPAN;
-
-	/* Keep the current value of the Status Register. */
-	ret = read_sr(nor);
-	if (ret < 0) {
-		dev_err(dev, "error while reading status register\n");
-		return -EINVAL;
-	}
-	sr_cr[0] = ret;
-
-	ret = write_sr_cr(nor, sr_cr);
+	ret = spi_nor_read_cr(nor, nor->bouncebuf);
 	if (ret)
 		return ret;
 
-	/* Read back and check it. */
-	ret = read_cr(nor);
-	if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {
-		dev_err(nor->dev, "Spansion Quad bit not set\n");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int spi_nor_write_sr2(struct spi_nor *nor, u8 *sr2)
-{
-	if (nor->spimem) {
-		struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRSR2, 1),
-				   SPI_MEM_OP_NO_ADDR,
-				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_DATA_OUT(1, sr2, 1));
-
-		return spi_mem_exec_op(nor->spimem, &op);
-	}
-
-	return nor->write_reg(nor, SPINOR_OP_WRSR2, sr2, 1);
-}
-
-static int spi_nor_read_sr2(struct spi_nor *nor, u8 *sr2)
-{
-	if (nor->spimem) {
-		struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_RDSR2, 1),
-				   SPI_MEM_OP_NO_ADDR,
-				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_DATA_IN(1, sr2, 1));
-
-		return spi_mem_exec_op(nor->spimem, &op);
-	}
+	if (nor->bouncebuf[0] & SR2_QUAD_EN_BIT1)
+		return 0;
 
-	return nor->read_reg(nor, SPINOR_OP_RDSR2, sr2, 1);
+	return spi_nor_write_16bit_cr_and_check(nor, nor->bouncebuf[0]);
 }
 
 /**
- * sr2_bit7_quad_enable() - set QE bit in Status Register 2.
+ * spi_nor_sr2_bit7_quad_enable() - set QE bit in Status Register 2.
  * @nor:	pointer to a 'struct spi_nor'
  *
  * Set the Quad Enable (QE) bit in the Status Register 2.
@@ -1903,10 +2139,11 @@ static int spi_nor_read_sr2(struct spi_nor *nor, u8 *sr2)
  *
  * Return: 0 on success, -errno otherwise.
  */
-static int sr2_bit7_quad_enable(struct spi_nor *nor)
+static int spi_nor_sr2_bit7_quad_enable(struct spi_nor *nor)
 {
 	u8 *sr2 = nor->bouncebuf;
 	int ret;
+	u8 sr2_written;
 
 	/* Check current Quad Enable bit value. */
 	ret = spi_nor_read_sr2(nor, sr2);
@@ -1918,117 +2155,23 @@ static int sr2_bit7_quad_enable(struct spi_nor *nor)
 	/* Update the Quad Enable bit. */
 	*sr2 |= SR2_QUAD_EN_BIT7;
 
-	write_enable(nor);
-
 	ret = spi_nor_write_sr2(nor, sr2);
-	if (ret < 0) {
-		dev_err(nor->dev, "error while writing status register 2\n");
-		return -EINVAL;
-	}
-
-	ret = spi_nor_wait_till_ready(nor);
-	if (ret < 0) {
-		dev_err(nor->dev, "timeout while writing status register 2\n");
+	if (ret)
 		return ret;
-	}
+
+	sr2_written = *sr2;
 
 	/* Read back and check it. */
 	ret = spi_nor_read_sr2(nor, sr2);
-	if (!(ret > 0 && (*sr2 & SR2_QUAD_EN_BIT7))) {
-		dev_err(nor->dev, "SR2 Quad bit not set\n");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-/**
- * spi_nor_clear_sr_bp() - clear the Status Register Block Protection bits.
- * @nor:        pointer to a 'struct spi_nor'
- *
- * Read-modify-write function that clears the Block Protection bits from the
- * Status Register without affecting other bits.
- *
- * Return: 0 on success, -errno otherwise.
- */
-static int spi_nor_clear_sr_bp(struct spi_nor *nor)
-{
-	int ret;
-	u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
-
-	ret = read_sr(nor);
-	if (ret < 0) {
-		dev_err(nor->dev, "error while reading status register\n");
-		return ret;
-	}
-
-	write_enable(nor);
-
-	ret = write_sr(nor, ret & ~mask);
-	if (ret) {
-		dev_err(nor->dev, "write to status register failed\n");
-		return ret;
-	}
-
-	ret = spi_nor_wait_till_ready(nor);
 	if (ret)
-		dev_err(nor->dev, "timeout while writing status register\n");
-	return ret;
-}
-
-/**
- * spi_nor_spansion_clear_sr_bp() - clear the Status Register Block Protection
- * bits on spansion flashes.
- * @nor:        pointer to a 'struct spi_nor'
- *
- * Read-modify-write function that clears the Block Protection bits from the
- * Status Register without affecting other bits. The function is tightly
- * coupled with the spansion_quad_enable() function. Both assume that the Write
- * Register with 16 bits, together with the Read Configuration Register (35h)
- * instructions are supported.
- *
- * Return: 0 on success, -errno otherwise.
- */
-static int spi_nor_spansion_clear_sr_bp(struct spi_nor *nor)
-{
-	int ret;
-	u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
-	u8 *sr_cr =  nor->bouncebuf;
-
-	/* Check current Quad Enable bit value. */
-	ret = read_cr(nor);
-	if (ret < 0) {
-		dev_err(nor->dev,
-			"error while reading configuration register\n");
 		return ret;
-	}
-
-	/*
-	 * When the configuration register Quad Enable bit is one, only the
-	 * Write Status (01h) command with two data bytes may be used.
-	 */
-	if (ret & CR_QUAD_EN_SPAN) {
-		sr_cr[1] = ret;
 
-		ret = read_sr(nor);
-		if (ret < 0) {
-			dev_err(nor->dev,
-				"error while reading status register\n");
-			return ret;
-		}
-		sr_cr[0] = ret & ~mask;
-
-		ret = write_sr_cr(nor, sr_cr);
-		if (ret)
-			dev_err(nor->dev, "16-bit write register failed\n");
-		return ret;
+	if (*sr2 != sr2_written) {
+		dev_dbg(nor->dev, "SR2: Read back test failed\n");
+		return -EIO;
 	}
 
-	/*
-	 * If the Quad Enable bit is zero, use the Write Status (01h) command
-	 * with one data byte.
-	 */
-	return spi_nor_clear_sr_bp(nor);
+	return 0;
 }
 
 /* Used when the "_ext_id" is two bytes at most */
@@ -2136,7 +2279,7 @@ static void gd25q256_default_init(struct spi_nor *nor)
 	 * indicate the quad_enable method for this case, we need
 	 * to set it in the default_init fixup hook.
 	 */
-	nor->params.quad_enable = macronix_quad_enable;
+	nor->params.quad_enable = spi_nor_sr1_bit6_quad_enable;
 }
 
 static struct spi_nor_fixups gd25q256_fixups = {
@@ -2179,6 +2322,8 @@ static const struct flash_info spi_nor_ids[] = {
 	{ "en25q64",    INFO(0x1c3017, 0, 64 * 1024,  128, SECT_4K) },
 	{ "en25q80a",   INFO(0x1c3014, 0, 64 * 1024,   16,
 			SECT_4K | SPI_NOR_DUAL_READ) },
+	{ "en25qh16",   INFO(0x1c7015, 0, 64 * 1024,   32,
+			SECT_4K | SPI_NOR_DUAL_READ) },
 	{ "en25qh32",   INFO(0x1c7016, 0, 64 * 1024,   64, 0) },
 	{ "en25qh64",   INFO(0x1c7017, 0, 64 * 1024,  128,
 			SECT_4K | SPI_NOR_DUAL_READ) },
@@ -2267,6 +2412,10 @@ static const struct flash_info spi_nor_ids[] = {
 			SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
 	{ "is25wp128",  INFO(0x9d7018, 0, 64 * 1024, 256,
 			SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
+	{ "is25wp256", INFO(0x9d7019, 0, 64 * 1024, 512,
+			    SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
+			    SPI_NOR_4B_OPCODES)
+		       .fixups = &is25lp256_fixups },
 
 	/* Macronix */
 	{ "mx25l512e",   INFO(0xc22010, 0, 64 * 1024,   1, SECT_4K) },
@@ -2482,6 +2631,8 @@ static const struct flash_info spi_nor_ids[] = {
 	{ "w25q256", INFO(0xef4019, 0, 64 * 1024, 512, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
 	{ "w25q256jvm", INFO(0xef7019, 0, 64 * 1024, 512,
 			     SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
+	{ "w25q256jw", INFO(0xef6019, 0, 64 * 1024, 512,
+			     SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
 	{ "w25m512jv", INFO(0xef7119, 0, 64 * 1024, 1024,
 			SECT_4K | SPI_NOR_QUAD_READ | SPI_NOR_DUAL_READ) },
 
@@ -2520,11 +2671,11 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
 
 		tmp = spi_mem_exec_op(nor->spimem, &op);
 	} else {
-		tmp = nor->read_reg(nor, SPINOR_OP_RDID, id,
-				    SPI_NOR_MAX_ID_LEN);
+		tmp = nor->controller_ops->read_reg(nor, SPINOR_OP_RDID, id,
+						    SPI_NOR_MAX_ID_LEN);
 	}
-	if (tmp < 0) {
-		dev_err(nor->dev, "error %d reading JEDEC ID\n", tmp);
+	if (tmp) {
+		dev_dbg(nor->dev, "error %d reading JEDEC ID\n", tmp);
 		return ERR_PTR(tmp);
 	}
 
@@ -2544,7 +2695,7 @@ static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
 			size_t *retlen, u_char *buf)
 {
 	struct spi_nor *nor = mtd_to_spi_nor(mtd);
-	int ret;
+	ssize_t ret;
 
 	dev_dbg(nor->dev, "from 0x%08x, len %zd\n", (u32)from, len);
 
@@ -2583,7 +2734,7 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
 		size_t *retlen, const u_char *buf)
 {
 	struct spi_nor *nor = mtd_to_spi_nor(mtd);
-	size_t actual;
+	size_t actual = 0;
 	int ret;
 
 	dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len);
@@ -2592,26 +2743,28 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
 	if (ret)
 		return ret;
 
-	write_enable(nor);
+	ret = spi_nor_write_enable(nor);
+	if (ret)
+		goto out;
 
 	nor->sst_write_second = false;
 
-	actual = to % 2;
 	/* Start write from odd address. */
-	if (actual) {
+	if (to % 2) {
 		nor->program_opcode = SPINOR_OP_BP;
 
 		/* write one byte. */
 		ret = spi_nor_write_data(nor, to, 1, buf);
 		if (ret < 0)
-			goto sst_write_err;
-		WARN(ret != 1, "While writing 1 byte written %i bytes\n",
-		     (int)ret);
+			goto out;
+		WARN(ret != 1, "While writing 1 byte written %i bytes\n", ret);
 		ret = spi_nor_wait_till_ready(nor);
 		if (ret)
-			goto sst_write_err;
+			goto out;
+
+		to++;
+		actual++;
 	}
-	to += actual;
 
 	/* Write out most of the data here. */
 	for (; actual < len - 1; actual += 2) {
@@ -2620,39 +2773,44 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
 		/* write two bytes. */
 		ret = spi_nor_write_data(nor, to, 2, buf + actual);
 		if (ret < 0)
-			goto sst_write_err;
-		WARN(ret != 2, "While writing 2 bytes written %i bytes\n",
-		     (int)ret);
+			goto out;
+		WARN(ret != 2, "While writing 2 bytes written %i bytes\n", ret);
 		ret = spi_nor_wait_till_ready(nor);
 		if (ret)
-			goto sst_write_err;
+			goto out;
 		to += 2;
 		nor->sst_write_second = true;
 	}
 	nor->sst_write_second = false;
 
-	write_disable(nor);
+	ret = spi_nor_write_disable(nor);
+	if (ret)
+		goto out;
+
 	ret = spi_nor_wait_till_ready(nor);
 	if (ret)
-		goto sst_write_err;
+		goto out;
 
 	/* Write out trailing byte if it exists. */
 	if (actual != len) {
-		write_enable(nor);
+		ret = spi_nor_write_enable(nor);
+		if (ret)
+			goto out;
 
 		nor->program_opcode = SPINOR_OP_BP;
 		ret = spi_nor_write_data(nor, to, 1, buf + actual);
 		if (ret < 0)
-			goto sst_write_err;
-		WARN(ret != 1, "While writing 1 byte written %i bytes\n",
-		     (int)ret);
+			goto out;
+		WARN(ret != 1, "While writing 1 byte written %i bytes\n", ret);
 		ret = spi_nor_wait_till_ready(nor);
 		if (ret)
-			goto sst_write_err;
-		write_disable(nor);
+			goto out;
+
 		actual += 1;
+
+		ret = spi_nor_write_disable(nor);
 	}
-sst_write_err:
+out:
 	*retlen += actual;
 	spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_WRITE);
 	return ret;
@@ -2701,7 +2859,10 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
 
 		addr = spi_nor_convert_addr(nor, addr);
 
-		write_enable(nor);
+		ret = spi_nor_write_enable(nor);
+		if (ret)
+			goto write_err;
+
 		ret = spi_nor_write_data(nor, addr, page_remain, buf + i);
 		if (ret < 0)
 			goto write_err;
@@ -2722,13 +2883,21 @@ write_err:
 static int spi_nor_check(struct spi_nor *nor)
 {
 	if (!nor->dev ||
-	    (!nor->spimem &&
-	    (!nor->read || !nor->write || !nor->read_reg ||
-	      !nor->write_reg))) {
+	    (!nor->spimem && !nor->controller_ops) ||
+	    (!nor->spimem && nor->controller_ops &&
+	    (!nor->controller_ops->read ||
+	     !nor->controller_ops->write ||
+	     !nor->controller_ops->read_reg ||
+	     !nor->controller_ops->write_reg))) {
 		pr_err("spi-nor: please fill all the necessary fields!\n");
 		return -EINVAL;
 	}
 
+	if (nor->spimem && nor->controller_ops) {
+		dev_err(nor->dev, "nor->spimem and nor->controller_ops are mutually exclusive, please set just one of them.\n");
+		return -EINVAL;
+	}
+
 	return 0;
 }
 
@@ -2738,10 +2907,8 @@ static int s3an_nor_setup(struct spi_nor *nor,
 	int ret;
 
 	ret = spi_nor_xread_sr(nor, nor->bouncebuf);
-	if (ret < 0) {
-		dev_err(nor->dev, "error %d reading XRDSR\n", (int) ret);
+	if (ret)
 		return ret;
-	}
 
 	nor->erase_opcode = SPINOR_OP_XSE;
 	nor->program_opcode = SPINOR_OP_XPP;
@@ -2865,7 +3032,7 @@ static int spi_nor_hwcaps_pp2cmd(u32 hwcaps)
  */
 static int spi_nor_read_raw(struct spi_nor *nor, u32 addr, size_t len, u8 *buf)
 {
-	int ret;
+	ssize_t ret;
 
 	while (len) {
 		ret = spi_nor_read_data(nor, addr, len, buf);
@@ -3489,20 +3656,39 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
 		break;
 
 	case BFPT_DWORD15_QER_SR2_BIT1_BUGGY:
+		/*
+		 * Writing only one byte to the Status Register has the
+		 * side-effect of clearing Status Register 2.
+		 */
 	case BFPT_DWORD15_QER_SR2_BIT1_NO_RD:
-		params->quad_enable = spansion_no_read_cr_quad_enable;
+		/*
+		 * Read Configuration Register (35h) instruction is not
+		 * supported.
+		 */
+		nor->flags |= SNOR_F_HAS_16BIT_SR | SNOR_F_NO_READ_CR;
+		params->quad_enable = spi_nor_sr2_bit1_quad_enable;
 		break;
 
 	case BFPT_DWORD15_QER_SR1_BIT6:
-		params->quad_enable = macronix_quad_enable;
+		nor->flags &= ~SNOR_F_HAS_16BIT_SR;
+		params->quad_enable = spi_nor_sr1_bit6_quad_enable;
 		break;
 
 	case BFPT_DWORD15_QER_SR2_BIT7:
-		params->quad_enable = sr2_bit7_quad_enable;
+		nor->flags &= ~SNOR_F_HAS_16BIT_SR;
+		params->quad_enable = spi_nor_sr2_bit7_quad_enable;
 		break;
 
 	case BFPT_DWORD15_QER_SR2_BIT1:
-		params->quad_enable = spansion_read_cr_quad_enable;
+		/*
+		 * JESD216 rev B or later does not specify if writing only one
+		 * byte to the Status Register clears or not the Status
+		 * Register 2, so let's be cautious and keep the default
+		 * assumption of a 16-bit Write Status (01h) command.
+		 */
+		nor->flags |= SNOR_F_HAS_16BIT_SR;
+
+		params->quad_enable = spi_nor_sr2_bit1_quad_enable;
 		break;
 
 	default:
@@ -4101,7 +4287,7 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
 		err = spi_nor_read_sfdp(nor, sizeof(header),
 					psize, param_headers);
 		if (err < 0) {
-			dev_err(dev, "failed to read SFDP parameter headers\n");
+			dev_dbg(dev, "failed to read SFDP parameter headers\n");
 			goto exit;
 		}
 	}
@@ -4348,7 +4534,7 @@ static int spi_nor_default_setup(struct spi_nor *nor,
 	/* Select the (Fast) Read command. */
 	err = spi_nor_select_read(nor, shared_mask);
 	if (err) {
-		dev_err(nor->dev,
+		dev_dbg(nor->dev,
 			"can't select read settings supported by both the SPI controller and memory.\n");
 		return err;
 	}
@@ -4356,7 +4542,7 @@ static int spi_nor_default_setup(struct spi_nor *nor,
 	/* Select the Page Program command. */
 	err = spi_nor_select_pp(nor, shared_mask);
 	if (err) {
-		dev_err(nor->dev,
+		dev_dbg(nor->dev,
 			"can't select write settings supported by both the SPI controller and memory.\n");
 		return err;
 	}
@@ -4364,7 +4550,7 @@ static int spi_nor_default_setup(struct spi_nor *nor,
 	/* Select the Sector Erase command. */
 	err = spi_nor_select_erase(nor);
 	if (err) {
-		dev_err(nor->dev,
+		dev_dbg(nor->dev,
 			"can't select erase settings supported by both the SPI controller and memory.\n");
 		return err;
 	}
@@ -4381,12 +4567,32 @@ static int spi_nor_setup(struct spi_nor *nor,
 	return nor->params.setup(nor, hwcaps);
 }
 
+static void atmel_set_default_init(struct spi_nor *nor)
+{
+	nor->flags |= SNOR_F_HAS_LOCK;
+}
+
+static void intel_set_default_init(struct spi_nor *nor)
+{
+	nor->flags |= SNOR_F_HAS_LOCK;
+}
+
+static void issi_set_default_init(struct spi_nor *nor)
+{
+	nor->params.quad_enable = spi_nor_sr1_bit6_quad_enable;
+}
+
 static void macronix_set_default_init(struct spi_nor *nor)
 {
-	nor->params.quad_enable = macronix_quad_enable;
+	nor->params.quad_enable = spi_nor_sr1_bit6_quad_enable;
 	nor->params.set_4byte = macronix_set_4byte;
 }
 
+static void sst_set_default_init(struct spi_nor *nor)
+{
+	nor->flags |= SNOR_F_HAS_LOCK;
+}
+
 static void st_micron_set_default_init(struct spi_nor *nor)
 {
 	nor->flags |= SNOR_F_HAS_LOCK;
@@ -4408,6 +4614,18 @@ static void spi_nor_manufacturer_init_params(struct spi_nor *nor)
 {
 	/* Init flash parameters based on MFR */
 	switch (JEDEC_MFR(nor->info)) {
+	case SNOR_MFR_ATMEL:
+		atmel_set_default_init(nor);
+		break;
+
+	case SNOR_MFR_INTEL:
+		intel_set_default_init(nor);
+		break;
+
+	case SNOR_MFR_ISSI:
+		issi_set_default_init(nor);
+		break;
+
 	case SNOR_MFR_MACRONIX:
 		macronix_set_default_init(nor);
 		break;
@@ -4417,6 +4635,10 @@ static void spi_nor_manufacturer_init_params(struct spi_nor *nor)
 		st_micron_set_default_init(nor);
 		break;
 
+	case SNOR_MFR_SST:
+		sst_set_default_init(nor);
+		break;
+
 	case SNOR_MFR_WINBOND:
 		winbond_set_default_init(nor);
 		break;
@@ -4465,9 +4687,11 @@ static void spi_nor_info_init_params(struct spi_nor *nor)
 	u8 i, erase_mask;
 
 	/* Initialize legacy flash parameters and settings. */
-	params->quad_enable = spansion_quad_enable;
+	params->quad_enable = spi_nor_sr2_bit1_quad_enable;
 	params->set_4byte = spansion_set_4byte;
 	params->setup = spi_nor_default_setup;
+	/* Default to 16-bit Write Status (01h) Command */
+	nor->flags |= SNOR_F_HAS_16BIT_SR;
 
 	/* Set SPI NOR sizes. */
 	params->size = (u64)info->sector_size * info->n_sectors;
@@ -4675,25 +4899,36 @@ static int spi_nor_quad_enable(struct spi_nor *nor)
 	return nor->params.quad_enable(nor);
 }
 
+/**
+ * spi_nor_unlock_all() - Unlocks the entire flash memory array.
+ * @nor:	pointer to a 'struct spi_nor'.
+ *
+ * Some SPI NOR flashes are write protected by default after a power-on reset
+ * cycle, in order to avoid inadvertent writes during power-up. Backward
+ * compatibility imposes to unlock the entire flash memory array at power-up
+ * by default.
+ */
+static int spi_nor_unlock_all(struct spi_nor *nor)
+{
+	if (nor->flags & SNOR_F_HAS_LOCK)
+		return spi_nor_unlock(&nor->mtd, 0, nor->params.size);
+
+	return 0;
+}
+
 static int spi_nor_init(struct spi_nor *nor)
 {
 	int err;
 
-	if (nor->clear_sr_bp) {
-		if (nor->params.quad_enable == spansion_quad_enable)
-			nor->clear_sr_bp = spi_nor_spansion_clear_sr_bp;
-
-		err = nor->clear_sr_bp(nor);
-		if (err) {
-			dev_err(nor->dev,
-				"fail to clear block protection bits\n");
-			return err;
-		}
+	err = spi_nor_quad_enable(nor);
+	if (err) {
+		dev_dbg(nor->dev, "quad mode not supported\n");
+		return err;
 	}
 
-	err = spi_nor_quad_enable(nor);
+	err = spi_nor_unlock_all(nor);
 	if (err) {
-		dev_err(nor->dev, "quad mode not supported\n");
+		dev_dbg(nor->dev, "Failed to unlock the entire flash memory array\n");
 		return err;
 	}
 
@@ -4761,7 +4996,7 @@ static int spi_nor_set_addr_width(struct spi_nor *nor)
 	}
 
 	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
-		dev_err(nor->dev, "address width is too large: %u\n",
+		dev_dbg(nor->dev, "address width is too large: %u\n",
 			nor->addr_width);
 		return -EINVAL;
 	}
@@ -4879,16 +5114,6 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	if (info->flags & SPI_NOR_HAS_LOCK)
 		nor->flags |= SNOR_F_HAS_LOCK;
 
-	/*
-	 * Atmel, SST, Intel/Numonyx, and others serial NOR tend to power up
-	 * with the software protection bits set.
-	 */
-	if (JEDEC_MFR(nor->info) == SNOR_MFR_ATMEL ||
-	    JEDEC_MFR(nor->info) == SNOR_MFR_INTEL ||
-	    JEDEC_MFR(nor->info) == SNOR_MFR_SST ||
-	    nor->info->flags & SPI_NOR_HAS_LOCK)
-		nor->clear_sr_bp = spi_nor_clear_sr_bp;
-
 	/* Init flash parameters based on flash_info struct and SFDP */
 	spi_nor_init_params(nor);
 
diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index a1dff92ceedf..0f847d510950 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -509,11 +509,9 @@ static const struct file_operations eraseblk_count_fops = {
  */
 int ubi_debugfs_init_dev(struct ubi_device *ubi)
 {
-	int err, n;
 	unsigned long ubi_num = ubi->ubi_num;
-	const char *fname;
-	struct dentry *dent;
 	struct ubi_debug_info *d = &ubi->dbg;
+	int n;
 
 	if (!IS_ENABLED(CONFIG_DEBUG_FS))
 		return 0;
@@ -522,95 +520,52 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi)
 		     ubi->ubi_num);
 	if (n == UBI_DFS_DIR_LEN) {
 		/* The array size is too small */
-		fname = UBI_DFS_DIR_NAME;
-		dent = ERR_PTR(-EINVAL);
-		goto out;
+		return -EINVAL;
 	}
 
-	fname = d->dfs_dir_name;
-	dent = debugfs_create_dir(fname, dfs_rootdir);
-	if (IS_ERR_OR_NULL(dent))
-		goto out;
-	d->dfs_dir = dent;
-
-	fname = "chk_gen";
-	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
-				   &dfs_fops);
-	if (IS_ERR_OR_NULL(dent))
-		goto out_remove;
-	d->dfs_chk_gen = dent;
-
-	fname = "chk_io";
-	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
-				   &dfs_fops);
-	if (IS_ERR_OR_NULL(dent))
-		goto out_remove;
-	d->dfs_chk_io = dent;
-
-	fname = "chk_fastmap";
-	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
-				   &dfs_fops);
-	if (IS_ERR_OR_NULL(dent))
-		goto out_remove;
-	d->dfs_chk_fastmap = dent;
-
-	fname = "tst_disable_bgt";
-	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
-				   &dfs_fops);
-	if (IS_ERR_OR_NULL(dent))
-		goto out_remove;
-	d->dfs_disable_bgt = dent;
-
-	fname = "tst_emulate_bitflips";
-	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
-				   &dfs_fops);
-	if (IS_ERR_OR_NULL(dent))
-		goto out_remove;
-	d->dfs_emulate_bitflips = dent;
-
-	fname = "tst_emulate_io_failures";
-	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
-				   &dfs_fops);
-	if (IS_ERR_OR_NULL(dent))
-		goto out_remove;
-	d->dfs_emulate_io_failures = dent;
-
-	fname = "tst_emulate_power_cut";
-	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
-				   &dfs_fops);
-	if (IS_ERR_OR_NULL(dent))
-		goto out_remove;
-	d->dfs_emulate_power_cut = dent;
-
-	fname = "tst_emulate_power_cut_min";
-	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
-				   &dfs_fops);
-	if (IS_ERR_OR_NULL(dent))
-		goto out_remove;
-	d->dfs_power_cut_min = dent;
-
-	fname = "tst_emulate_power_cut_max";
-	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
-				   &dfs_fops);
-	if (IS_ERR_OR_NULL(dent))
-		goto out_remove;
-	d->dfs_power_cut_max = dent;
-
-	fname = "detailed_erase_block_info";
-	dent = debugfs_create_file(fname, S_IRUSR, d->dfs_dir, (void *)ubi_num,
-				   &eraseblk_count_fops);
-	if (IS_ERR_OR_NULL(dent))
-		goto out_remove;
+	d->dfs_dir = debugfs_create_dir(d->dfs_dir_name, dfs_rootdir);
 
-	return 0;
+	d->dfs_chk_gen = debugfs_create_file("chk_gen", S_IWUSR, d->dfs_dir,
+					     (void *)ubi_num, &dfs_fops);
 
-out_remove:
-	debugfs_remove_recursive(d->dfs_dir);
-out:
-	err = dent ? PTR_ERR(dent) : -ENODEV;
-	ubi_err(ubi, "cannot create \"%s\" debugfs file or directory, error %d\n",
-		fname, err);
-	return err;
+	d->dfs_chk_io = debugfs_create_file("chk_io", S_IWUSR, d->dfs_dir,
+					    (void *)ubi_num, &dfs_fops);
+
+	d->dfs_chk_fastmap = debugfs_create_file("chk_fastmap", S_IWUSR,
+						 d->dfs_dir, (void *)ubi_num,
+						 &dfs_fops);
+
+	d->dfs_disable_bgt = debugfs_create_file("tst_disable_bgt", S_IWUSR,
+						 d->dfs_dir, (void *)ubi_num,
+						 &dfs_fops);
+
+	d->dfs_emulate_bitflips = debugfs_create_file("tst_emulate_bitflips",
+						      S_IWUSR, d->dfs_dir,
+						      (void *)ubi_num,
+						      &dfs_fops);
+
+	d->dfs_emulate_io_failures = debugfs_create_file("tst_emulate_io_failures",
+							 S_IWUSR, d->dfs_dir,
+							 (void *)ubi_num,
+							 &dfs_fops);
+
+	d->dfs_emulate_power_cut = debugfs_create_file("tst_emulate_power_cut",
+						       S_IWUSR, d->dfs_dir,
+						       (void *)ubi_num,
+						       &dfs_fops);
+
+	d->dfs_power_cut_min = debugfs_create_file("tst_emulate_power_cut_min",
+						   S_IWUSR, d->dfs_dir,
+						   (void *)ubi_num, &dfs_fops);
+
+	d->dfs_power_cut_max = debugfs_create_file("tst_emulate_power_cut_max",
+						   S_IWUSR, d->dfs_dir,
+						   (void *)ubi_num, &dfs_fops);
+
+	debugfs_create_file("detailed_erase_block_info", S_IRUSR, d->dfs_dir,
+			    (void *)ubi_num, &eraseblk_count_fops);
+
+	return 0;
 }
 
 /**