This one is available in the kernel and used by the denali driver
Signed-off-by: Enrico Jorns <ejo@xxxxxxxxxxxxxx>
---
drivers/mtd/nand/nand_base.c | 2 ++
include/linux/mtd/nand.h | 12 ++++++++++++
2 files changed, 14 insertions(+)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index bf4110a..ca48f59 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2819,6 +2819,8 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip,
mtd->oobsize = le16_to_cpu(p->spare_bytes_per_page);
chip->chipsize = le32_to_cpu(p->blocks_per_lun);
chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count;
+ chip->bits_per_cell = p->bits_per_cell;
+
*busw = 0;
if (le16_to_cpu(p->features) & 1)
*busw = NAND_BUSWIDTH_16;
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 3c7509f..f126cd9 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -430,6 +430,7 @@ 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
+ * @bits_per_cell: [INTERN] number of bits per cell. i.e., 1 means SLC.
* @cellinfo: [INTERN] MLC/multichip data from chip ident
* @numchips: [INTERN] number of physical chips
* @chipsize: [INTERN] the size of one chip for multichip arrays
@@ -506,6 +507,7 @@ struct nand_chip {
int pagebuf;
unsigned int pagebuf_bitflips;
int subpagesize;
+ uint8_t bits_per_cell;
uint8_t cellinfo;
int badblockpos;
int badblockbits;
@@ -722,4 +724,14 @@ static inline int onfi_get_sync_timing_mode(struct nand_chip *chip)
return le16_to_cpu(chip->onfi_params.src_sync_timing_mode);
}
+/*
+ * Check if it is a SLC nand.
+ * The !nand_is_slc() can be used to check the MLC/TLC nand chips.
+ * We do not distinguish the MLC and TLC now.
+ */
+static inline bool nand_is_slc(struct nand_chip *chip)
+{
+ return chip->bits_per_cell == 1;
+}
+
#endif /* __LINUX_MTD_NAND_H */
--
2.5.1
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