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[MTD NAND] Allow override of page read and write functions. 

- allow high-level nand_write_page() function to be overridden
- likewise low-level write_page_raw() and read_page_raw() functions
- Clean up the abuse of chip->ecc.{write,read}_page() with MTD_OOB_RAW

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse 2006-09-25 17:12:39 +01:00
parent 4bf63fcb83
commit 956e944c76
2 changed files with 32 additions and 23 deletions
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44
drivers/mtd/nand/nand_base.c
View File

@ -990,7 +990,10 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
}
/* Now read the page into the buffer */
ret = chip->ecc.read_page(mtd, chip, bufpoi);
if (unlikely(ops->mode == MTD_OOB_RAW))
ret = chip->ecc.read_page_raw(mtd, chip, bufpoi);
else
ret = chip->ecc.read_page(mtd, chip, bufpoi);
if (ret < 0)
break;
@ -1323,8 +1326,6 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
static int nand_read_oob(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
{
int (*read_page)(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf) = NULL;
struct nand_chip *chip = mtd->priv;
int ret = -ENOTSUPP;
@ -1342,12 +1343,7 @@ static int nand_read_oob(struct mtd_info *mtd, loff_t from,
switch(ops->mode) {
case MTD_OOB_PLACE:
case MTD_OOB_AUTO:
break;
case MTD_OOB_RAW:
/* Replace the read_page algorithm temporary */
read_page = chip->ecc.read_page;
chip->ecc.read_page = nand_read_page_raw;
break;
default:
@ -1359,8 +1355,6 @@ static int nand_read_oob(struct mtd_info *mtd, loff_t from,
else
ret = nand_do_read_ops(mtd, from, ops);
if (unlikely(ops->mode == MTD_OOB_RAW))
chip->ecc.read_page = read_page;
out:
nand_release_device(mtd);
return ret;
@ -1479,7 +1473,7 @@ static void nand_write_page_syndrome(struct mtd_info *mtd,
}
/**
* nand_write_page - [INTERNAL] write one page
* nand_write_page - [REPLACEABLE] write one page
* @mtd: MTD device structure
* @chip: NAND chip descriptor
* @buf: the data to write
@ -1487,13 +1481,16 @@ static void nand_write_page_syndrome(struct mtd_info *mtd,
* @cached: cached programming
*/
static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf, int page, int cached)
const uint8_t *buf, int page, int cached, int raw)
{
int status;
chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
chip->ecc.write_page(mtd, chip, buf);
if (unlikely(raw))
chip->ecc.write_page_raw(mtd, chip, buf);
else
chip->ecc.write_page(mtd, chip, buf);
/*
* Cached progamming disabled for now, Not sure if its worth the
@ -1636,7 +1633,8 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
if (unlikely(oob))
oob = nand_fill_oob(chip, oob, ops);
ret = nand_write_page(mtd, chip, buf, page, cached);
ret = chip->write_page(mtd, chip, buf, page, cached,
(ops->mode == MTD_OOB_RAW));
if (ret)
break;
@ -1769,8 +1767,6 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
static int nand_write_oob(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops)
{
void (*write_page)(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf) = NULL;
struct nand_chip *chip = mtd->priv;
int ret = -ENOTSUPP;
@ -1788,12 +1784,7 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to,
switch(ops->mode) {
case MTD_OOB_PLACE:
case MTD_OOB_AUTO:
break;
case MTD_OOB_RAW:
/* Replace the write_page algorithm temporary */
write_page = chip->ecc.write_page;
chip->ecc.write_page = nand_write_page_raw;
break;
default:
@ -1805,8 +1796,6 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to,
else
ret = nand_do_write_ops(mtd, to, ops);
if (unlikely(ops->mode == MTD_OOB_RAW))
chip->ecc.write_page = write_page;
out:
nand_release_device(mtd);
return ret;
@ -2383,10 +2372,18 @@ int nand_scan_tail(struct mtd_info *mtd)
}
}
if (!chip->write_page)
chip->write_page = nand_write_page;
/*
* check ECC mode, default to software if 3byte/512byte hardware ECC is
* selected and we have 256 byte pagesize fallback to software ECC
*/
if (!chip->ecc.read_page_raw)
chip->ecc.read_page_raw = nand_read_page_raw;
if (!chip->ecc.write_page_raw)
chip->ecc.write_page_raw = nand_write_page_raw;
switch (chip->ecc.mode) {
case NAND_ECC_HW:
/* Use standard hwecc read page function ? */
@ -2444,6 +2441,7 @@ int nand_scan_tail(struct mtd_info *mtd)
chip->ecc.size = mtd->writesize;
chip->ecc.bytes = 0;
break;
default:
printk(KERN_WARNING "Invalid NAND_ECC_MODE %d\n",
chip->ecc.mode);

11
include/linux/mtd/nand.h
View File

@ -235,6 +235,8 @@ struct nand_hw_control {
* 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)
* @read_page_raw: function to read a raw page without ECC
* @write_page_raw: function to write a raw page without ECC
* @read_page: function to read a page according to the ecc generator requirements
* @write_page: function to write a page according to the ecc generator requirements
* @read_oob: function to read chip OOB data
@ -256,6 +258,12 @@ struct nand_ecc_ctrl {
int (*correct)(struct mtd_info *mtd, uint8_t *dat,
uint8_t *read_ecc,
uint8_t *calc_ecc);
int (*read_page_raw)(struct mtd_info *mtd,
struct nand_chip *chip,
uint8_t *buf);
void (*write_page_raw)(struct mtd_info *mtd,
struct nand_chip *chip,
const uint8_t *buf);
int (*read_page)(struct mtd_info *mtd,
struct nand_chip *chip,
uint8_t *buf);
@ -344,6 +352,7 @@ struct nand_buffers {
* @priv: [OPTIONAL] pointer to private chip date
* @errstat: [OPTIONAL] hardware specific function to perform additional error status checks
* (determine if errors are correctable)
* @write_page [REPLACEABLE] High-level page write function
*/
struct nand_chip {
@ -366,6 +375,8 @@ struct nand_chip {
void (*erase_cmd)(struct mtd_info *mtd, int page);
int (*scan_bbt)(struct mtd_info *mtd);
int (*errstat)(struct mtd_info *mtd, struct nand_chip *this, int state, int status, int page);
int (*write_page)(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf, int page, int cached, int raw);
int chip_delay;
unsigned int options;