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authorThomas Gleixner <tglx@cruncher.tec.linutronix.de>2006-05-23 12:00:46 +0200
committerThomas Gleixner <tglx@cruncher.tec.linutronix.de>2006-05-23 12:00:46 +0200
commit6dfc6d250d0b7ebaa6423c44dcd09fcfe68deabd (patch)
tree2be25b1e302eca5984a8ad5ed3e5bde77bafaabb /include/linux
parent7aa65bfd6793a56cc3bbce8436abbfea3a7bdd1f (diff)
[MTD] NAND modularize ECC
First step of modularizing ECC support. - Move ECC related functionality into a seperate embedded data structure - Get rid of the hardware dependend constants to simplify new ECC models Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/mtd/nand.h63
1 files changed, 33 insertions, 30 deletions
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 601c5c703a0..460525841a2 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -113,21 +113,12 @@ extern int nand_read_raw (struct mtd_info *mtd, uint8_t *buf, loff_t from,
/*
* Constants for ECC_MODES
*/
-
-/* No ECC. Usage is not recommended ! */
-#define NAND_ECC_NONE 0
-/* Software ECC 3 byte ECC per 256 Byte data */
-#define NAND_ECC_SOFT 1
-/* Hardware ECC 3 byte ECC per 256 Byte data */
-#define NAND_ECC_HW3_256 2
-/* Hardware ECC 3 byte ECC per 512 Byte data */
-#define NAND_ECC_HW3_512 3
-/* Hardware ECC 3 byte ECC per 512 Byte data */
-#define NAND_ECC_HW6_512 4
-/* Hardware ECC 8 byte ECC per 512 Byte data */
-#define NAND_ECC_HW8_512 6
-/* Hardware ECC 12 byte ECC per 2048 Byte data */
-#define NAND_ECC_HW12_2048 7
+typedef enum {
+ NAND_ECC_NONE,
+ NAND_ECC_SOFT,
+ NAND_ECC_HW,
+ NAND_ECC_HW_SYNDROME,
+} nand_ecc_modes_t;
/*
* Constants for Hardware ECC
@@ -231,6 +222,31 @@ struct nand_hw_control {
};
/**
+ * struct nand_ecc_ctrl - Control structure for ecc
+ * @mode: ecc mode
+ * @steps: number of ecc steps per page
+ * @size: data bytes per ecc step
+ * @bytes: ecc bytes per step
+ * @hwctl: function to control hardware ecc generator. Must only
+ * be provided if an hardware ECC is available
+ * @calculate: function for ecc calculation or readback from ecc hardware
+ * @correct: function for ecc correction, matching to ecc generator (sw/hw)
+ */
+struct nand_ecc_ctrl {
+ nand_ecc_modes_t mode;
+ int steps;
+ int size;
+ int bytes;
+ int (*hwctl)(struct mtd_info *mtd, int mode);
+ int (*calculate)(struct mtd_info *mtd,
+ const uint8_t *dat,
+ uint8_t *ecc_code);
+ int (*correct)(struct mtd_info *mtd, uint8_t *dat,
+ uint8_t *read_ecc,
+ uint8_t *calc_ecc);
+};
+
+/**
* struct nand_chip - NAND Private Flash Chip Data
* @IO_ADDR_R: [BOARDSPECIFIC] address to read the 8 I/O lines of the flash device
* @IO_ADDR_W: [BOARDSPECIFIC] address to write the 8 I/O lines of the flash device
@@ -250,16 +266,9 @@ struct nand_hw_control {
* is read from the chip status register
* @cmdfunc: [REPLACEABLE] hardwarespecific function for writing commands to the chip
* @waitfunc: [REPLACEABLE] hardwarespecific function for wait on ready
- * @calculate_ecc: [REPLACEABLE] function for ecc calculation or readback from ecc hardware
- * @correct_data: [REPLACEABLE] function for ecc correction, matching to ecc generator (sw/hw)
- * @enable_hwecc: [BOARDSPECIFIC] function to enable (reset) hardware ecc generator. Must only
- * be provided if a hardware ECC is available
+ * @ecc: [BOARDSPECIFIC] ecc control ctructure
* @erase_cmd: [INTERN] erase command write function, selectable due to AND support
* @scan_bbt: [REPLACEABLE] function to scan bad block table
- * @eccmode: [BOARDSPECIFIC] mode of ecc, see defines
- * @eccsize: [INTERN] databytes used per ecc-calculation
- * @eccbytes: [INTERN] number of ecc bytes per ecc-calculation step
- * @eccsteps: [INTERN] number of ecc calculation steps per page
* @chip_delay: [BOARDSPECIFIC] chip dependent delay for transfering data from array to read regs (tR)
* @wq: [INTERN] wait queue to sleep on if a NAND operation is in progress
* @state: [INTERN] the current state of the NAND device
@@ -309,15 +318,9 @@ struct nand_chip {
int (*dev_ready)(struct mtd_info *mtd);
void (*cmdfunc)(struct mtd_info *mtd, unsigned command, int column, int page_addr);
int (*waitfunc)(struct mtd_info *mtd, struct nand_chip *this, int state);
- int (*calculate_ecc)(struct mtd_info *mtd, const uint8_t *dat, uint8_t *ecc_code);
- int (*correct_data)(struct mtd_info *mtd, uint8_t *dat, uint8_t *read_ecc, uint8_t *calc_ecc);
- void (*enable_hwecc)(struct mtd_info *mtd, int mode);
void (*erase_cmd)(struct mtd_info *mtd, int page);
int (*scan_bbt)(struct mtd_info *mtd);
- int eccmode;
- int eccsize;
- int eccbytes;
- int eccsteps;
+ struct nand_ecc_ctrl ecc;
int chip_delay;
wait_queue_head_t wq;
nand_state_t state;