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[MTD] NAND Cleanup oob functions 

Cleanup the code in the oob related functions and
make use of the new NO_READRDY flag.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2006-05-25 09:51:54 +02:00 committed by David Woodhouse
parent 7a30601b3a
commit 7314e9e7d5
1 changed files with 81 additions and 75 deletions
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156
drivers/mtd/nand/nand_base.c
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@ -1270,86 +1270,91 @@ int nand_do_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
*
* NAND read out-of-band data from the spare area
*/
static int nand_read_oob(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, uint8_t *buf)
static int nand_read_oob(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, uint8_t *buf)
{
int i, col, page, chipnr;
int col, page, realpage, chipnr, sndcmd = 1;
struct nand_chip *chip = mtd->priv;
int blockcheck = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;
int blkcheck = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;
int readlen = len;
DEBUG(MTD_DEBUG_LEVEL3, "nand_read_oob: from = 0x%08x, len = %i\n", (unsigned int)from, (int)len);
/* Shift to get page */
page = (int)(from >> chip->page_shift);
chipnr = (int)(from >> chip->chip_shift);
/* Mask to get column */
col = from & (mtd->oobsize - 1);
DEBUG(MTD_DEBUG_LEVEL3, "nand_read_oob: from = 0x%08x, len = %i\n",
(unsigned int)from, (int)len);
/* Initialize return length value */
*retlen = 0;
/* Do not allow reads past end of device */
if ((from + len) > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: Attempt read beyond end of device\n");
*retlen = 0;
DEBUG(MTD_DEBUG_LEVEL0, "nand_read_oob: "
"Attempt read beyond end of device\n");
return -EINVAL;
}
/* Grab the lock and see if the device is available */
nand_get_device(chip, mtd, FL_READING);
/* Select the NAND device */
chipnr = (int)(from >> chip->chip_shift);
chip->select_chip(mtd, chipnr);
/* Send the read command */
chip->cmdfunc(mtd, NAND_CMD_READOOB, col, page & chip->pagemask);
/*
* Read the data, if we read more than one page
* oob data, let the device transfer the data !
*/
i = 0;
while (i < len) {
int thislen = mtd->oobsize - col;
thislen = min_t(int, thislen, len);
chip->read_buf(mtd, &buf[i], thislen);
i += thislen;
/* Shift to get page */
realpage = (int)(from >> chip->page_shift);
page = realpage & chip->pagemask;
/* Read more ? */
if (i < len) {
page++;
col = 0;
/* Mask to get column */
col = from & (mtd->oobsize - 1);
/* Check, if we cross a chip boundary */
if (!(page & chip->pagemask)) {
chipnr++;
chip->select_chip(mtd, -1);
chip->select_chip(mtd, chipnr);
}
while(1) {
int bytes = min((int)(mtd->oobsize - col), readlen);
/* Apply delay or wait for ready/busy pin
* Do this before the AUTOINCR check, so no problems
* arise if a chip which does auto increment
* is marked as NOAUTOINCR by the board driver.
if (likely(sndcmd)) {
chip->cmdfunc(mtd, NAND_CMD_READOOB, col, page);
sndcmd = 0;
}
chip->read_buf(mtd, buf, bytes);
readlen -= bytes;
if (!readlen)
break;
if (!(chip->options & NAND_NO_READRDY)) {
/*
* Apply delay or wait for ready/busy pin. Do this
* before the AUTOINCR check, so no problems arise if a
* chip which does auto increment is marked as
* NOAUTOINCR by the board driver.
*/
if (!chip->dev_ready)
udelay(chip->chip_delay);
else
nand_wait_ready(mtd);
/* Check, if the chip supports auto page increment
* or if we have hit a block boundary.
*/
if (!NAND_CANAUTOINCR(chip) || !(page & blockcheck)) {
/* For subsequent page reads set offset to 0 */
chip->cmdfunc(mtd, NAND_CMD_READOOB, 0x0, page & chip->pagemask);
}
}
buf += bytes;
bytes = mtd->oobsize;
col = 0;
/* Increment page address */
realpage++;
page = realpage & chip->pagemask;
/* Check, if we cross a chip boundary */
if (!page) {
chipnr++;
chip->select_chip(mtd, -1);
chip->select_chip(mtd, chipnr);
}
/* Check, if the chip supports auto page increment
* or if we have hit a block boundary.
*/
if (!NAND_CANAUTOINCR(chip) || !(page & blkcheck))
sndcmd = 1;
}
/* Deselect and wake up anyone waiting on the device */
nand_release_device(mtd);
/* Return happy */
*retlen = len;
return 0;
}
@ -1676,6 +1681,7 @@ static int nand_write(struct mtd_info *mtd, loff_t to, size_t len,
return ret;
}
/**
* nand_write_oob - [MTD Interface] NAND write out-of-band
* @mtd: MTD device structure
@ -1686,40 +1692,40 @@ static int nand_write(struct mtd_info *mtd, loff_t to, size_t len,
*
* NAND write out-of-band
*/
static int nand_write_oob(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const uint8_t *buf)
static int nand_write_oob(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const uint8_t *buf)
{
int column, page, status, ret = -EIO, chipnr;
struct nand_chip *chip = mtd->priv;
DEBUG(MTD_DEBUG_LEVEL3, "nand_write_oob: to = 0x%08x, len = %i\n", (unsigned int)to, (int)len);
/* Shift to get page */
page = (int)(to >> chip->page_shift);
chipnr = (int)(to >> chip->chip_shift);
/* Mask to get column */
column = to & (mtd->oobsize - 1);
DEBUG(MTD_DEBUG_LEVEL3, "nand_write_oob: to = 0x%08x, len = %i\n",
(unsigned int)to, (int)len);
/* Initialize return length value */
*retlen = 0;
/* Do not allow write past end of page */
column = to & (mtd->oobsize - 1);
if ((column + len) > mtd->oobsize) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: Attempt to write past end of page\n");
DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: "
"Attempt to write past end of page\n");
return -EINVAL;
}
/* Grab the lock and see if the device is available */
nand_get_device(chip, mtd, FL_WRITING);
/* Select the NAND device */
chipnr = (int)(to >> chip->chip_shift);
chip->select_chip(mtd, chipnr);
/* Reset the chip. Some chips (like the Toshiba TC5832DC found
in one of my DiskOnChip 2000 test units) will clear the whole
data page too if we don't do this. I have no clue why, but
I seem to have 'fixed' it in the doc2000 driver in
August 1999. dwmw2. */
/* Shift to get page */
page = (int)(to >> chip->page_shift);
/*
* Reset the chip. Some chips (like the Toshiba TC5832DC found in one
* of my DiskOnChip 2000 test units) will clear the whole data page too
* if we don't do this. I have no clue why, but I seem to have 'fixed'
* it in the doc2000 driver in August 1999. dwmw2.
*/
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
/* Check, if it is write protected */
@ -1731,8 +1737,8 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to, size_t len, size_t *r
chip->pagebuf = -1;
if (NAND_MUST_PAD(chip)) {
/* Write out desired data */
chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page & chip->pagemask);
chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize,
page & chip->pagemask);
/* prepad 0xff for partial programming */
chip->write_buf(mtd, ffchars, column);
/* write data */
@ -1740,9 +1746,8 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to, size_t len, size_t *r
/* postpad 0xff for partial programming */
chip->write_buf(mtd, ffchars, mtd->oobsize - (len + column));
} else {
/* Write out desired data */
chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + column, page & chip->pagemask);
/* write data */
chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + column,
page & chip->pagemask);
chip->write_buf(mtd, buf, len);
}
/* Send command to program the OOB data */
@ -1752,11 +1757,11 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to, size_t len, size_t *r
/* See if device thinks it succeeded */
if (status & NAND_STATUS_FAIL) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: " "Failed write, page 0x%08x\n", page);
DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: "
"Failed write, page 0x%08x\n", page);
ret = -EIO;
goto out;
}
/* Return happy */
*retlen = len;
#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
@ -1764,7 +1769,8 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to, size_t len, size_t *r
chip->cmdfunc(mtd, NAND_CMD_READOOB, column, page & chip->pagemask);
if (chip->verify_buf(mtd, buf, len)) {
DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: " "Failed write verify, page 0x%08x\n", page);
DEBUG(MTD_DEBUG_LEVEL0, "nand_write_oob: "
"Failed write verify, page 0x%08x\n", page);
ret = -EIO;
goto out;
}