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authorThomas Gleixner <tglx@linutronix.de>2006-09-28 15:38:36 +0200
committerArtem Bityutskiy <dedekind@infradead.org>2006-11-29 17:03:52 +0200
commit29072b96078ffde36f03d51e6b5d0cff1ba8c7df (patch)
tree1353a27ae7e594044c521e28abf558e3796f98c9 /include/linux/mtd
parentf6a7ecb18dabd88bd9f28e7bece564cabe8ffe82 (diff)
[MTD] NAND: add subpage write support
Many SLC NANDs support up to 4 writes at one NAND page. Add support of this feature. Signed-off-by: Artem Bityutskiy <dedekind@infradead.org>
Diffstat (limited to 'include/linux/mtd')
-rw-r--r--include/linux/mtd/mtd.h2
-rw-r--r--include/linux/mtd/nand.h9
2 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index e34bbc98d4f..18acb6d0033 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -200,6 +200,8 @@ struct mtd_info {
/* ECC status information */
struct mtd_ecc_stats ecc_stats;
+ /* Subpage shift (NAND) */
+ int subpage_sft;
void *priv;
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 6fc3e07497e..1aeedf27a1f 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -166,6 +166,9 @@ typedef enum {
* for all large page devices, as they do not support
* autoincrement.*/
#define NAND_NO_READRDY 0x00000100
+/* Chip does not allow subpage writes */
+#define NAND_NO_SUBPAGE_WRITE 0x00000200
+
/* Options valid for Samsung large page devices */
#define NAND_SAMSUNG_LP_OPTIONS \
@@ -193,6 +196,9 @@ typedef enum {
/* Nand scan has allocated controller struct */
#define NAND_CONTROLLER_ALLOC 0x80000000
+/* Cell info constants */
+#define NAND_CI_CHIPNR_MSK 0x03
+#define NAND_CI_CELLTYPE_MSK 0x0C
/*
* nand_state_t - chip states
@@ -341,6 +347,7 @@ struct nand_buffers {
* @chipsize: [INTERN] the size of one chip for multichip arrays
* @pagemask: [INTERN] page number mask = number of (pages / chip) - 1
* @pagebuf: [INTERN] holds the pagenumber which is currently in data_buf
+ * @subpagesize: [INTERN] holds the subpagesize
* @ecclayout: [REPLACEABLE] the default ecc placement scheme
* @bbt: [INTERN] bad block table pointer
* @bbt_td: [REPLACEABLE] bad block table descriptor for flash lookup
@@ -388,6 +395,8 @@ struct nand_chip {
unsigned long chipsize;
int pagemask;
int pagebuf;
+ int subpagesize;
+ uint8_t cellinfo;
int badblockpos;
nand_state_t state;