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mtd: add init_size hook for NAND driver 

Not all the NAND devices have all the information in additional
id bytes.

So add a hook in the nand_chip{} is a good method to calculate the
right value of oobsize, erasesize and so on.

Without the hook,you will get the wrong value, and you have to hack
in the ->scan_bbt() to change the wrong value which make the code
mess.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Huang Shijie 2010-09-27 10:43:53 +08:00 committed by David Woodhouse
parent 088bd455c9
commit 12a40a57f7
2 changed files with 10 additions and 2 deletions
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6
drivers/mtd/nand/nand_base.c
View File

@ -2976,8 +2976,10 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
chip->chipsize = (uint64_t)type->chipsize << 20;
/* Newer devices have all the information in additional id bytes */
if (!type->pagesize) {
if (!type->pagesize && chip->init_size) {
/* set the pagesize, oobsize, erasesize by the driver*/
busw = chip->init_size(mtd, chip, id_data);
} else if (!type->pagesize) {
int extid;
/* The 3rd id byte holds MLC / multichip data */
chip->cellinfo = id_data[2];

6
include/linux/mtd/nand.h
View File

@ -396,6 +396,10 @@ struct nand_buffers {
* @block_markbad: [REPLACEABLE] mark the block bad
* @cmd_ctrl: [BOARDSPECIFIC] hardwarespecific funtion for controlling
* ALE/CLE/nCE. Also used to write command and address
* @init_size: [BOARDSPECIFIC] hardwarespecific funtion for setting
* mtd->oobsize, mtd->writesize and so on.
* @id_data contains the 8 bytes values of NAND_CMD_READID.
* Return with the bus width.
* @dev_ready: [BOARDSPECIFIC] hardwarespecific function for accesing device ready/busy line
* If set to NULL no access to ready/busy is available and the ready/busy information
* is read from the chip status register
@ -452,6 +456,8 @@ struct nand_chip {
int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
void (*cmd_ctrl)(struct mtd_info *mtd, int dat,
unsigned int ctrl);
int (*init_size)(struct mtd_info *mtd,
struct nand_chip *this, u8 *id_data);
int (*dev_ready)(struct mtd_info *mtd);
void (*cmdfunc)(struct mtd_info *mtd, unsigned command, int column, int page_addr);
int (*waitfunc)(struct mtd_info *mtd, struct nand_chip *this);