diff options
| author | Huang Shijie <b32955@freescale.com> | 2013-09-25 10:58:11 +0400 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2013-10-28 03:27:04 +0400 |
| commit | 7db906b79f69b6ed936a1ef1d788f02e3ad42462 (patch) | |
| tree | a5ff4e764cc159db07358a90781b48a976ca5e22 /drivers/mtd/nand/nand_base.c | |
| parent | 1d0ed69ddd714b6e2a974f42896463366923ded6 (diff) | |
| download | linux-7db906b79f69b6ed936a1ef1d788f02e3ad42462.tar.xz | |
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>
Diffstat (limited to 'drivers/mtd/nand/nand_base.c')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 6ea66270dbf5..5fb00957fd25 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3082,6 +3082,16 @@ static int nand_id_len(u8 *id_data, int arrlen) return arrlen; } +/* Extract the bits of per cell from the 3rd byte of the extended ID */ +static int nand_get_bits_per_cell(u8 cellinfo) +{ + int bits; + + bits = cellinfo & NAND_CI_CELLTYPE_MSK; + bits >>= NAND_CI_CELLTYPE_SHIFT; + return bits + 1; +} + /* * Many new NAND share similar device ID codes, which represent the size of the * chip. The rest of the parameters must be decoded according to generic or @@ -3092,7 +3102,7 @@ static void nand_decode_ext_id(struct mtd_info *mtd, struct nand_chip *chip, { int extid, id_len; /* The 3rd id byte holds MLC / multichip data */ - chip->cellinfo = id_data[2]; + chip->bits_per_cell = nand_get_bits_per_cell(id_data[2]); /* The 4th id byte is the important one */ extid = id_data[3]; @@ -3292,7 +3302,7 @@ static bool find_full_id_nand(struct mtd_info *mtd, struct nand_chip *chip, mtd->erasesize = type->erasesize; mtd->oobsize = type->oobsize; - chip->cellinfo = id_data[2]; + chip->bits_per_cell = nand_get_bits_per_cell(id_data[2]); chip->chipsize = (uint64_t)type->chipsize << 20; chip->options |= type->options; chip->ecc_strength_ds = NAND_ECC_STRENGTH(type); |