diff options
| author | Siva Durga Prasad Paladugu | 2017-05-25 14:25:55 +0530 |
|---|---|---|
| committer | Michal Simek | 2018-05-11 09:23:43 +0200 |
| commit | 9ca8388059de8f10e035fbdcaa418ec3caeb0599 (patch) | |
| tree | 36e2b08b16920c55baaa66c614b61faa0b6cdf4e /drivers/mtd | |
| parent | 6de7a5b90701fb306b150d0ed32f7b59b51bbbc5 (diff) | |
nand: zynq: Add support for 16-bit buswidth
This patch adds support for 16-bit buswidth by determining
the bus width based on mio configuration.
Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/zynq_nand.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/mtd/nand/zynq_nand.c b/drivers/mtd/nand/zynq_nand.c index efd3c9b7987..4d0ea9e6b9d 100644 --- a/drivers/mtd/nand/zynq_nand.c +++ b/drivers/mtd/nand/zynq_nand.c @@ -16,6 +16,7 @@ #include <linux/mtd/partitions.h> #include <linux/mtd/nand_ecc.h> #include <asm/arch/hardware.h> +#include <asm/arch/sys_proto.h> /* The NAND flash driver defines */ #define ZYNQ_NAND_CMD_PHASE 1 @@ -83,6 +84,15 @@ #define ZYNQ_NAND_ECC_BUSY (1 << 6) /* ECC block is busy */ #define ZYNQ_NAND_ECC_MASK 0x00FFFFFF /* ECC value mask */ +#define ZYNQ_NAND_MIO_NUM_NAND_8BIT 13 +#define ZYNQ_NAND_MIO_NUM_NAND_16BIT 8 + +enum zynq_nand_bus_width { + NAND_BW_UNKNOWN = -1, + NAND_BW_8BIT, + NAND_BW_16BIT, +}; + #ifndef NAND_CMD_LOCK_TIGHT #define NAND_CMD_LOCK_TIGHT 0x2c #endif @@ -1005,6 +1015,23 @@ static int zynq_nand_device_ready(struct mtd_info *mtd) return 0; } +static int zynq_nand_check_is_16bit_bw_flash(void) +{ + int is_16bit_bw = NAND_BW_UNKNOWN; + int mio_num_8bit = 0, mio_num_16bit = 0; + + mio_num_8bit = zynq_slcr_get_mio_pin_status("nand8"); + if (mio_num_8bit == ZYNQ_NAND_MIO_NUM_NAND_8BIT) + is_16bit_bw = NAND_BW_8BIT; + + mio_num_16bit = zynq_slcr_get_mio_pin_status("nand16"); + if (mio_num_8bit == ZYNQ_NAND_MIO_NUM_NAND_8BIT && + mio_num_16bit == ZYNQ_NAND_MIO_NUM_NAND_16BIT) + is_16bit_bw = NAND_BW_16BIT; + + return is_16bit_bw; +} + static int zynq_nand_init(struct nand_chip *nand_chip, int devnum) { struct zynq_nand_info *xnand; @@ -1016,6 +1043,7 @@ static int zynq_nand_init(struct nand_chip *nand_chip, int devnum) unsigned long ecc_cfg; int ondie_ecc_enabled = 0; int err = -1; + int is_16bit_bw; xnand = calloc(1, sizeof(struct zynq_nand_info)); if (!xnand) { @@ -1045,6 +1073,16 @@ static int zynq_nand_init(struct nand_chip *nand_chip, int devnum) nand_chip->read_buf = zynq_nand_read_buf; nand_chip->write_buf = zynq_nand_write_buf; + is_16bit_bw = zynq_nand_check_is_16bit_bw_flash(); + if (is_16bit_bw == NAND_BW_UNKNOWN) { + printf("%s: Unable detect NAND based on MIO settings\n", + __func__); + goto fail; + } + + if (is_16bit_bw == NAND_BW_16BIT) + nand_chip->options = NAND_BUSWIDTH_16; + nand_chip->bbt_options = NAND_BBT_USE_FLASH; /* Initialize the NAND flash interface on NAND controller */ |