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mtd: at91: add dt parameters for Atmel PMECC

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Add DT support for PMECC parameters.

Signed-off-by: Hong Xu <hong.xu@atmel.com>
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Josh Wu
2012-06-29 17:47:54 +08:00
committed by David Woodhouse
parent fae255253b
commit a41b51a1f7
2 changed files with 90 additions and 2 deletions
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52
drivers/mtd/nand/atmel_nand.c
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@@ -93,6 +93,11 @@ struct atmel_nand_host {
struct completion comp;
struct dma_chan *dma_chan;
bool has_pmecc;
u8 pmecc_corr_cap;
u16 pmecc_sector_size;
u32 pmecc_lookup_table_offset;
};
static int cpu_has_dma(void)
@@ -481,7 +486,8 @@ static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
struct device_node *np)
{
u32 val;
u32 val, table_offset;
u32 offset[2];
int ecc_mode;
struct atmel_nand_data *board = &host->board;
enum of_gpio_flags flags;
@@ -517,6 +523,50 @@ static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
board->enable_pin = of_get_gpio(np, 1);
board->det_pin = of_get_gpio(np, 2);
host->has_pmecc = of_property_read_bool(np, "atmel,has-pmecc");
if (!(board->ecc_mode == NAND_ECC_HW) || !host->has_pmecc)
return 0; /* Not using PMECC */
/* use PMECC, get correction capability, sector size and lookup
* table offset.
*/
if (of_property_read_u32(np, "atmel,pmecc-cap", &val) != 0) {
dev_err(host->dev, "Cannot decide PMECC Capability\n");
return -EINVAL;
} else if ((val != 2) && (val != 4) && (val != 8) && (val != 12) &&
(val != 24)) {
dev_err(host->dev,
"Unsupported PMECC correction capability: %d; should be 2, 4, 8, 12 or 24\n",
val);
return -EINVAL;
}
host->pmecc_corr_cap = (u8)val;
if (of_property_read_u32(np, "atmel,pmecc-sector-size", &val) != 0) {
dev_err(host->dev, "Cannot decide PMECC Sector Size\n");
return -EINVAL;
} else if ((val != 512) && (val != 1024)) {
dev_err(host->dev,
"Unsupported PMECC sector size: %d; should be 512 or 1024 bytes\n",
val);
return -EINVAL;
}
host->pmecc_sector_size = (u16)val;
if (of_property_read_u32_array(np, "atmel,pmecc-lookup-table-offset",
offset, 2) != 0) {
dev_err(host->dev, "Cannot get PMECC lookup table offset\n");
return -EINVAL;
}
table_offset = host->pmecc_sector_size == 512 ? offset[0] : offset[1];
if (!table_offset) {
dev_err(host->dev, "Invalid PMECC lookup table offset\n");
return -EINVAL;
}
host->pmecc_lookup_table_offset = table_offset;
return 0;
}
#else