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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>
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088bd455c9
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2 changed files with 10 additions and 2 deletions
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@ -2976,8 +2976,10 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
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chip->chipsize = (uint64_t)type->chipsize << 20;
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/* Newer devices have all the information in additional id bytes */
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if (!type->pagesize) {
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if (!type->pagesize && chip->init_size) {
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/* set the pagesize, oobsize, erasesize by the driver*/
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busw = chip->init_size(mtd, chip, id_data);
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} else if (!type->pagesize) {
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int extid;
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/* The 3rd id byte holds MLC / multichip data */
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chip->cellinfo = id_data[2];
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@ -396,6 +396,10 @@ struct nand_buffers {
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* @block_markbad: [REPLACEABLE] mark the block bad
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* @cmd_ctrl: [BOARDSPECIFIC] hardwarespecific funtion for controlling
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* ALE/CLE/nCE. Also used to write command and address
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* @init_size: [BOARDSPECIFIC] hardwarespecific funtion for setting
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* mtd->oobsize, mtd->writesize and so on.
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* @id_data contains the 8 bytes values of NAND_CMD_READID.
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* Return with the bus width.
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* @dev_ready: [BOARDSPECIFIC] hardwarespecific function for accesing device ready/busy line
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* If set to NULL no access to ready/busy is available and the ready/busy information
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* is read from the chip status register
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@ -452,6 +456,8 @@ struct nand_chip {
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int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
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void (*cmd_ctrl)(struct mtd_info *mtd, int dat,
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unsigned int ctrl);
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int (*init_size)(struct mtd_info *mtd,
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struct nand_chip *this, u8 *id_data);
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int (*dev_ready)(struct mtd_info *mtd);
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void (*cmdfunc)(struct mtd_info *mtd, unsigned command, int column, int page_addr);
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int (*waitfunc)(struct mtd_info *mtd, struct nand_chip *this);
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