From b11a9b99f7775da32a3f4c71a281fac661af6ad4 Mon Sep 17 00:00:00 2001 From: Huang Shijie Date: Mon, 27 Sep 2010 10:43:53 +0800 Subject: [PATCH] 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 --- drivers/mtd/nand/nand_base.c | 6 ++++-- include/linux/mtd/nand.h | 6 ++++++ 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index d551ddd..bf31e2c 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -2848,8 +2848,10 @@ 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]; diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index 102e12c..1b39edd 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -332,6 +332,10 @@ 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 @@ -386,6 +390,8 @@ 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); -- 1.6.3.3