mtd: nand: rename the cellinfo to bits_per_cell

The @cellinfo fields contains unused information, such as write caching,
internal chip numbering, etc. But we only use it to check the SLC or MLC.

This patch tries to make it more clear and simple, renames the @cellinfo
to @bits_per_cell.

In order to avoiding the bisect issue, this patch also does the following
changes:
  (0) add a macro NAND_CI_CELLTYPE_SHIFT to avoid the hardcode.

  (1) add a helper to parse out the cell type : nand_get_bits_per_cell()

  (2) parse out the cell type for extended-ID chips and the full-id nand chips.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 5c05bab0ad89..9e6c8f9f306e 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -198,6 +198,7 @@ typedef enum {
 /* Cell info constants */
 #define NAND_CI_CHIPNR_MSK      0x03
 #define NAND_CI_CELLTYPE_MSK    0x0C
+#define NAND_CI_CELLTYPE_SHIFT  2
 
 /* Keep gcc happy */
 struct nand_chip;
@@ -477,7 +478,7 @@ struct nand_buffers {
  * @badblockbits:       [INTERN] minimum number of set bits in a good block's
  *                      bad block marker position; i.e., BBM == 11110111b is
  *                      not bad when badblockbits == 7
- * @cellinfo:           [INTERN] MLC/multichip data from chip ident
+ * @bits_per_cell:      [INTERN] number of bits per cell. i.e., 1 means SLC.
  * @ecc_strength_ds:    [INTERN] ECC correctability from the datasheet.
  *                      Minimum amount of bit errors per @ecc_step_ds guaranteed
  *                      to be correctable. If unknown, set to zero.
@@ -558,7 +559,7 @@ struct nand_chip {
         int pagebuf;
         unsigned int pagebuf_bitflips;
         int subpagesize;
-        uint8_t cellinfo;
+        uint8_t bits_per_cell;
         uint16_t ecc_strength_ds;
         uint16_t ecc_step_ds;
         int badblockpos;
@@ -802,6 +803,6 @@ static inline int onfi_get_sync_timing_mode(struct nand_chip *chip)
  */
 static inline bool nand_is_slc(struct nand_chip *chip)
 {
-        return !(chip->cellinfo & NAND_CI_CELLTYPE_MSK);
+        return chip->bits_per_cell == 1;
 }
 #endif /* __LINUX_MTD_NAND_H */