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authorDavid Woodhouse <dwmw2@infradead.org>2006-10-21 12:09:53 -0400
committerDavid Woodhouse <dwmw2@infradead.org>2006-10-21 12:48:58 -0400
commit7dcdcbef5d2b60d1db68fd2c07351f7afd8ad376 (patch)
tree8a3817d93520bf28aaea42534a953909f9bb10e3 /drivers/mtd/nand/nand_base.c
parent513b046c96cc2fbce730a3474f6f7ff0c4fdd05c (diff)
[MTD] NAND: Combined oob buffer so it's contiguous with data
Ditch the separate oobrbuf and oobwbuf fields from the chip buffers, and use only a single buffer immediately after the data. This accommodates NAND controllers such as the OLPC CAFÉ chip, which can't do scatter/gather DMA so needs the OOB buffer to be contiguous with the data, for both read and write. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'drivers/mtd/nand/nand_base.c')
-rw-r--r--drivers/mtd/nand/nand_base.c15
1 files changed, 5 insertions, 10 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 53c66d5c8d1a..29090c6d4819 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -971,7 +971,6 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
971 page = realpage & chip->pagemask; 971 page = realpage & chip->pagemask;
972 972
973 col = (int)(from & (mtd->writesize - 1)); 973 col = (int)(from & (mtd->writesize - 1));
974 chip->oob_poi = chip->buffers->oobrbuf;
975 974
976 buf = ops->datbuf; 975 buf = ops->datbuf;
977 oob = ops->oobbuf; 976 oob = ops->oobbuf;
@@ -1270,8 +1269,6 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
1270 realpage = (int)(from >> chip->page_shift); 1269 realpage = (int)(from >> chip->page_shift);
1271 page = realpage & chip->pagemask; 1270 page = realpage & chip->pagemask;
1272 1271
1273 chip->oob_poi = chip->buffers->oobrbuf;
1274
1275 while(1) { 1272 while(1) {
1276 sndcmd = chip->ecc.read_oob(mtd, chip, page, sndcmd); 1273 sndcmd = chip->ecc.read_oob(mtd, chip, page, sndcmd);
1277 buf = nand_transfer_oob(chip, buf, ops); 1274 buf = nand_transfer_oob(chip, buf, ops);
@@ -1625,7 +1622,9 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
1625 (chip->pagebuf << chip->page_shift) < (to + ops->len)) 1622 (chip->pagebuf << chip->page_shift) < (to + ops->len))
1626 chip->pagebuf = -1; 1623 chip->pagebuf = -1;
1627 1624
1628 chip->oob_poi = chip->buffers->oobwbuf; 1625 /* If we're not given explicit OOB data, let it be 0xFF */
1626 if (likely(!oob))
1627 memset(chip->oob_poi, 0xff, mtd->oobsize);
1629 1628
1630 while(1) { 1629 while(1) {
1631 int cached = writelen > bytes && page != blockmask; 1630 int cached = writelen > bytes && page != blockmask;
@@ -1654,9 +1653,6 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
1654 } 1653 }
1655 } 1654 }
1656 1655
1657 if (unlikely(oob))
1658 memset(chip->oob_poi, 0xff, mtd->oobsize);
1659
1660 ops->retlen = ops->len - writelen; 1656 ops->retlen = ops->len - writelen;
1661 return ret; 1657 return ret;
1662} 1658}
@@ -1744,7 +1740,6 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
1744 if (page == chip->pagebuf) 1740 if (page == chip->pagebuf)
1745 chip->pagebuf = -1; 1741 chip->pagebuf = -1;
1746 1742
1747 chip->oob_poi = chip->buffers->oobwbuf;
1748 memset(chip->oob_poi, 0xff, mtd->oobsize); 1743 memset(chip->oob_poi, 0xff, mtd->oobsize);
1749 nand_fill_oob(chip, ops->oobbuf, ops); 1744 nand_fill_oob(chip, ops->oobbuf, ops);
1750 status = chip->ecc.write_oob(mtd, chip, page & chip->pagemask); 1745 status = chip->ecc.write_oob(mtd, chip, page & chip->pagemask);
@@ -2348,8 +2343,8 @@ int nand_scan_tail(struct mtd_info *mtd)
2348 if (!chip->buffers) 2343 if (!chip->buffers)
2349 return -ENOMEM; 2344 return -ENOMEM;
2350 2345
2351 /* Preset the internal oob write buffer */ 2346 /* Set the internal oob buffer location, just after the page data */
2352 memset(chip->buffers->oobwbuf, 0xff, mtd->oobsize); 2347 chip->oob_poi = chip->buffers + mtd->writesize;
2353 2348
2354 /* 2349 /*
2355 * If no default placement scheme is given, select an appropriate one 2350 * If no default placement scheme is given, select an appropriate one