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>

2 files changed, 10 insertions, 2 deletions

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 0b70c175999c..53f4e41836f1 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -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];
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 7666c42235c7..0f744547a48c 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -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);