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mtd: OneNAND: Introduce chip_probe function

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Samsung SoCs use the own OneNAND controler and detect OneNAND chip at power on.
To use this feature, introduce the chip_probe function.

Also remove workaround for Samsung SoCs.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Kyungmin Park 2010-05-28 11:03:11 +09:00 committed by David Woodhouse
parent 42b0aab1cc
commit ad0d363b8f
2 changed files with 32 additions and 12 deletions
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42
drivers/mtd/onenand/onenand_base.c
View File

@ -3733,17 +3733,16 @@ out:
}
/**
* onenand_probe - [OneNAND Interface] Probe the OneNAND device
* onenand_chip_probe - [OneNAND Interface] The generic chip probe
* @param mtd MTD device structure
*
* OneNAND detection method:
* Compare the values from command with ones from register
*/
static int onenand_probe(struct mtd_info *mtd)
static int onenand_chip_probe(struct mtd_info *mtd)
{
struct onenand_chip *this = mtd->priv;
int bram_maf_id, bram_dev_id, maf_id, dev_id, ver_id;
int density;
int bram_maf_id, bram_dev_id, maf_id, dev_id;
int syscfg;
/* Save system configuration 1 */
@ -3766,12 +3765,6 @@ 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;
@ -3779,13 +3772,35 @@ static int onenand_probe(struct mtd_info *mtd)
/* Read manufacturer and device IDs from Register */
maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
this->technology = this->read_word(this->base + ONENAND_REG_TECHNOLOGY);
/* Check OneNAND device */
if (maf_id != bram_maf_id || dev_id != bram_dev_id)
return -ENXIO;
return 0;
}
/**
* onenand_probe - [OneNAND Interface] Probe the OneNAND device
* @param mtd MTD device structure
*/
static int onenand_probe(struct mtd_info *mtd)
{
struct onenand_chip *this = mtd->priv;
int maf_id, dev_id, ver_id;
int density;
int ret;
ret = this->chip_probe(mtd);
if (ret)
return ret;
/* Read manufacturer and device IDs from Register */
maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
this->technology = this->read_word(this->base + ONENAND_REG_TECHNOLOGY);
/* Flash device information */
onenand_print_device_info(dev_id, ver_id);
this->device_id = dev_id;
@ -3912,6 +3927,9 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
if (!this->unlock_all)
this->unlock_all = onenand_unlock_all;
if (!this->chip_probe)
this->chip_probe = onenand_chip_probe;
if (!this->read_bufferram)
this->read_bufferram = onenand_read_bufferram;
if (!this->write_bufferram)

2
include/linux/mtd/onenand.h
View File

@ -68,6 +68,7 @@ struct onenand_bufferram {
* @write_word: [REPLACEABLE] hardware specific function for write
* register of OneNAND
* @mmcontrol: sync burst read function
* @chip_probe: [REPLACEABLE] hardware specific function for chip probe
* @block_markbad: function to mark a block as bad
* @scan_bbt: [REPLACEALBE] hardware specific function for scanning
* Bad block Table
@ -114,6 +115,7 @@ struct onenand_chip {
unsigned short (*read_word)(void __iomem *addr);
void (*write_word)(unsigned short value, void __iomem *addr);
void (*mmcontrol)(struct mtd_info *mtd, int sync_read);
int (*chip_probe)(struct mtd_info *mtd);
int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
int (*scan_bbt)(struct mtd_info *mtd);