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>
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 6ea6627..5fb0095 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3082,6 +3082,16 @@
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 @@
{
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 @@
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);