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mtd: onenand: add workaround for SYNC_WRITE mode 

Some chips fails to identify properly when SYNC_WRITE mode is enabled
(the example is OneNAND on S5PC110 SoC). This patch adds a workaround
for such chips.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Kyungmin Park 2010-04-28 17:46:48 +02:00 committed by David Woodhouse
parent 3328dc3159
commit c37cb56fb1
1 changed files with 9 additions and 3 deletions
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12
drivers/mtd/onenand/onenand_base.c
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@ -3763,6 +3763,12 @@ static int onenand_probe(struct mtd_info *mtd)
/* Restore system configuration 1 */
this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
/* Workaround */
if (syscfg & ONENAND_SYS_CFG1_SYNC_WRITE) {
bram_maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
bram_dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
}
/* Check manufacturer ID */
if (onenand_check_maf(bram_maf_id))
return -ENXIO;
@ -3782,6 +3788,9 @@ static int onenand_probe(struct mtd_info *mtd)
this->device_id = dev_id;
this->version_id = ver_id;
/* Check OneNAND features */
onenand_check_features(mtd);
density = onenand_get_density(dev_id);
if (FLEXONENAND(this)) {
this->dies = ONENAND_IS_DDP(this) ? 2 : 1;
@ -3833,9 +3842,6 @@ static int onenand_probe(struct mtd_info *mtd)
else
mtd->size = this->chipsize;
/* Check OneNAND features */
onenand_check_features(mtd);
/*
* We emulate the 4KiB page and 256KiB erase block size
* But oobsize is still 64 bytes.