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platform_kernel-5.15
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mxc_nand: Allow flash based bbt 

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2009-10-21 14:25:27 +02:00
parent f06368f7d1
commit f1372055df
2 changed files with 36 additions and 1 deletions
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3
arch/arm/plat-mxc/include/mach/mxc_nand.h
View File

@ -22,6 +22,7 @@
struct mxc_nand_platform_data { struct mxc_nand_platform_data {
int width; /* data bus width in bytes */ int width; /* data bus width in bytes */
int hw_ecc; /* 0 if supress hardware ECC */ int hw_ecc:1; /* 0 if supress hardware ECC */
int flash_bbt:1; /* set to 1 to use a flash based bbt */
}; };
#endif /* __ASM_ARCH_NAND_H */ #endif /* __ASM_ARCH_NAND_H */

34
drivers/mtd/nand/mxc_nand.c
View File

@ -648,6 +648,33 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
} }
} }
/*
* The generic flash bbt decriptors overlap with our ecc
* hardware, so define some i.MX specific ones.
*/
static uint8_t bbt_pattern[] = { 'B', 'b', 't', '0' };
static uint8_t mirror_pattern[] = { '1', 't', 'b', 'B' };
static struct nand_bbt_descr bbt_main_descr = {
.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
.offs = 0,
.len = 4,
.veroffs = 4,
.maxblocks = 4,
.pattern = bbt_pattern,
};
static struct nand_bbt_descr bbt_mirror_descr = {
.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
.offs = 0,
.len = 4,
.veroffs = 4,
.maxblocks = 4,
.pattern = mirror_pattern,
};
static int __init mxcnd_probe(struct platform_device *pdev) static int __init mxcnd_probe(struct platform_device *pdev)
{ {
struct nand_chip *this; struct nand_chip *this;
@ -786,6 +813,13 @@ static int __init mxcnd_probe(struct platform_device *pdev)
if (pdata->width == 2) if (pdata->width == 2)
this->options |= NAND_BUSWIDTH_16; this->options |= NAND_BUSWIDTH_16;
if (pdata->flash_bbt) {
this->bbt_td = &bbt_main_descr;
this->bbt_md = &bbt_mirror_descr;
/* update flash based bbt */
this->options |= NAND_USE_FLASH_BBT;
}
/* first scan to find the device and get the page size */ /* first scan to find the device and get the page size */
if (nand_scan_ident(mtd, 1)) { if (nand_scan_ident(mtd, 1)) {
err = -ENXIO; err = -ENXIO;