From 7314e9e7d57293c58b3e10a25a8a1d9328444187 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Thu, 25 May 2006 09:51:54 +0200 Subject: [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 --- drivers/mtd/nand/nand_base.c | 156 ++++++++++++++++++++++--------------------- 1 file changed, 81 insertions(+), 75 deletions(-) (limited to 'drivers/mtd/nand') diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 61b2363f932..49bca242610 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -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; - - 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); + int blkcheck = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1; + int readlen = len; - /* 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; - - /* Read more ? */ - if (i < len) { - page++; - col = 0; + /* Shift to get page */ + realpage = (int)(from >> chip->page_shift); + page = realpage & chip->pagemask; - /* Check, if we cross a chip boundary */ - if (!(page & chip->pagemask)) { - chipnr++; - chip->select_chip(mtd, -1); - chip->select_chip(mtd, chipnr); - } + /* Mask to get column */ + col = from & (mtd->oobsize - 1); + + while(1) { + int bytes = min((int)(mtd->oobsize - col), readlen); + + if (likely(sndcmd)) { + chip->cmdfunc(mtd, NAND_CMD_READOOB, col, page); + sndcmd = 0; + } + + chip->read_buf(mtd, buf, bytes); - /* 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. + 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; } -- cgit v1.2.3-18-g5258