diff options
| author | Alex Waterman | 2011-05-19 15:08:36 -0400 |
|---|---|---|
| committer | Scott Wood | 2011-07-01 15:56:52 -0500 |
| commit | eced4626e4d8ea2fd2662045dc7aad0f07db7a41 (patch) | |
| tree | b69ea937b15426b9a4c19521ee5f8420531cee84 /drivers/mtd | |
| parent | c9494866df835bcee68e17339aec1090faa704da (diff) | |
NAND: Add 16bit NAND support for the NDFC
This patch adds support for 16 bit NAND devices attached to the
NDFC on ppc4xx processors. Two config entries were added:
CONFIG_SYS_NDFC_16 - Setting this tells the NDFC that a
16 bit device is attached.
CONFIG_SYS_NDFC_EBC0_CFG - This is for the External Bus
Controller configuration register.
Also, a new ndfc_read_byte() function was added which does not
first convert the data to little endian.
The NAND SPL was also modified to do 16bit bad block testing
when a 16 bit chip is being used.
Signed-off-by: Alex Waterman <awaterman@dawning.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/ndfc.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/drivers/mtd/nand/ndfc.c b/drivers/mtd/nand/ndfc.c index 0729e0c9c02..6ebbb5ebee9 100644 --- a/drivers/mtd/nand/ndfc.c +++ b/drivers/mtd/nand/ndfc.c @@ -37,6 +37,13 @@ #include <asm/io.h> #include <asm/ppc4xx.h> +#ifndef CONFIG_SYS_NAND_BCR +#define CONFIG_SYS_NAND_BCR 0x80002222 +#endif +#ifndef CONFIG_SYS_NDFC_EBC0_CFG +#define CONFIG_SYS_NDFC_EBC0_CFG 0xb8400000 +#endif + /* * We need to store the info, which chip-select (CS) is used for the * chip number. For example on Sequoia NAND chip #0 uses @@ -140,12 +147,25 @@ static int ndfc_verify_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len return 0; } -#endif /* #ifndef CONFIG_NAND_SPL */ -#ifndef CONFIG_SYS_NAND_BCR -#define CONFIG_SYS_NAND_BCR 0x80002222 +/* + * Read a byte from the NDFC. + */ +static uint8_t ndfc_read_byte(struct mtd_info *mtd) +{ + + struct nand_chip *chip = mtd->priv; + +#ifdef CONFIG_SYS_NDFC_16BIT + return (uint8_t) readw(chip->IO_ADDR_R); +#else + return readb(chip->IO_ADDR_R); #endif +} + +#endif /* #ifndef CONFIG_NAND_SPL */ + void board_nand_select_device(struct nand_chip *nand, int chip) { /* @@ -198,16 +218,21 @@ int board_nand_init(struct nand_chip *nand) nand->ecc.bytes = 3; nand->select_chip = ndfc_select_chip; +#ifdef CONFIG_SYS_NDFC_16BIT + nand->options |= NAND_BUSWIDTH_16; +#endif + #ifndef CONFIG_NAND_SPL nand->write_buf = ndfc_write_buf; nand->verify_buf = ndfc_verify_buf; + nand->read_byte = ndfc_read_byte; chip++; #else /* * Setup EBC (CS0 only right now) */ - mtebc(EBC0_CFG, 0xb8400000); + mtebc(EBC0_CFG, CONFIG_SYS_NDFC_EBC0_CFG); mtebc(PB0CR, CONFIG_SYS_EBC_PB0CR); mtebc(PB0AP, CONFIG_SYS_EBC_PB0AP); |