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[MTD] [NAND] S3C2410 Large page NAND support

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This adds support for using large page NAND devices
with the S3C24XX NAND controller. This also adds the
file Documentation/arm/Samsung-S3C24XX/NAND.txt to
describe the differences.

Signed-off-by: Ben Dooks <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
This commit is contained in:
Ben Dooks 2008-04-15 11:36:19 +01:00 • committed by David Woodhouse
commit 71d54f3855
3 changed files with 65 additions and 5 deletions
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38
drivers/mtd/nand/s3c2410.c
View file

@ -472,7 +472,7 @@ static int s3c2440_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u
ecc_code[1] = ecc >> 8;
ecc_code[2] = ecc >> 16;
pr_debug("%s: returning ecc %06lx\n", __func__, ecc);
pr_debug("%s: returning ecc %06lx\n", __func__, ecc & 0xffffff);
return 0;
}
@ -643,9 +643,6 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
chip->ecc.calculate = s3c2410_nand_calculate_ecc;
chip->ecc.correct = s3c2410_nand_correct_data;
chip->ecc.mode = NAND_ECC_HW;
chip->ecc.size = 512;
chip->ecc.bytes = 3;
chip->ecc.layout = &nand_hw_eccoob;
switch (info->cpu_type) {
case TYPE_S3C2410:
@ -669,6 +666,34 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
}
}
/* s3c2410_nand_update_chip
*
* post-probe chip update, to change any items, such as the
* layout for large page nand
*/
static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info,
struct s3c2410_nand_mtd *nmtd)
{
struct nand_chip *chip = &nmtd->chip;
printk("%s: chip %p: %d\n", __func__, chip, chip->page_shift);
if (hardware_ecc) {
/* change the behaviour depending on wether we are using
* the large or small page nand device */
if (chip->page_shift > 10) {
chip->ecc.size = 256;
chip->ecc.bytes = 3;
} else {
chip->ecc.size = 512;
chip->ecc.bytes = 3;
chip->ecc.layout = &nand_hw_eccoob;
}
}
}
/* s3c2410_nand_probe
*
* called by device layer when it finds a device matching
@ -775,9 +800,12 @@ static int s3c24xx_nand_probe(struct platform_device *pdev,
s3c2410_nand_init_chip(info, nmtd, sets);
nmtd->scan_res = nand_scan(&nmtd->mtd, (sets) ? sets->nr_chips : 1);
nmtd->scan_res = nand_scan_ident(&nmtd->mtd,
(sets) ? sets->nr_chips : 1);
if (nmtd->scan_res == 0) {
s3c2410_nand_update_chip(info, nmtd);
nand_scan_tail(&nmtd->mtd);
s3c2410_nand_add_partition(info, nmtd, sets);
}