summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/devices/docg3.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2012-06-01 16:55:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-06-01 16:55:42 -0700
commitf5e7e844a571124ffc117d4696787d6afc4fc5ae (patch)
tree26bb17dc94e9536da540c187b00cedb0c1b24664 /drivers/mtd/devices/docg3.c
parent48445159e9ecb44a96a4de06c6ae7c54eb43ba5b (diff)
parent4a43faf54e9173b6acce37cf7f053fc9515a2cdf (diff)
Merge tag 'for-linus-3.5-20120601' of git://git.infradead.org/linux-mtd
Pull mtd update from David Woodhouse: - More robust parsing especially of xattr data in JFFS2 - Updates to mxc_nand and gpmi drivers to support new boards and device tree - Improve consistency of information about ECC strength in NAND devices - Clean up partition handling of plat_nand - Support NAND drivers without dedicated access to OOB area - BCH hardware ECC support for OMAP - Other fixes and cleanups, and a few new device IDs Fixed trivial conflict in drivers/mtd/nand/gpmi-nand/gpmi-nand.c due to added include files next to each other. * tag 'for-linus-3.5-20120601' of git://git.infradead.org/linux-mtd: (75 commits) mtd: mxc_nand: move ecc strengh setup before nand_scan_tail mtd: block2mtd: fix recursive call of mtd_writev mtd: gpmi-nand: define ecc.strength mtd: of_parts: fix breakage in Kconfig mtd: nand: fix scan_read_raw_oob mtd: docg3 fix in-middle of blocks reads mtd: cfi_cmdset_0002: Slight cleanup of fixup messages mtd: add fixup for S29NS512P NOR flash. jffs2: allow to complete xattr integrity check on first GC scan jffs2: allow to discriminate between recoverable and non-recoverable errors mtd: nand: omap: add support for hardware BCH ecc ARM: OMAP3: gpmc: add BCH ecc api and modes mtd: nand: check the return code of 'read_oob/read_oob_raw' mtd: nand: remove 'sndcmd' parameter of 'read_oob/read_oob_raw' mtd: m25p80: Add support for Winbond W25Q80BW jffs2: get rid of jffs2_sync_super jffs2: remove unnecessary GC pass on sync jffs2: remove unnecessary GC pass on umount jffs2: remove lock_super mtd: gpmi: add gpmi support for mx6q ...
Diffstat (limited to 'drivers/mtd/devices/docg3.c')
-rw-r--r--drivers/mtd/devices/docg3.c40
1 files changed, 27 insertions, 13 deletions
diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index 50aa90aa7a7..f70854d728f 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -227,7 +227,7 @@ static void doc_read_data_area(struct docg3 *docg3, void *buf, int len,
u8 data8, *dst8;
doc_dbg("doc_read_data_area(buf=%p, len=%d)\n", buf, len);
- cdr = len & 0x3;
+ cdr = len & 0x1;
len4 = len - cdr;
if (first)
@@ -732,12 +732,24 @@ err:
* @len: the number of bytes to be read (must be a multiple of 4)
* @buf: the buffer to be filled in (or NULL is forget bytes)
* @first: 1 if first time read, DOC_READADDRESS should be set
+ * @last_odd: 1 if last read ended up on an odd byte
+ *
+ * Reads bytes from a prepared page. There is a trickery here : if the last read
+ * ended up on an odd offset in the 1024 bytes double page, ie. between the 2
+ * planes, the first byte must be read apart. If a word (16bit) read was used,
+ * the read would return the byte of plane 2 as low *and* high endian, which
+ * will mess the read.
*
*/
static int doc_read_page_getbytes(struct docg3 *docg3, int len, u_char *buf,
- int first)
+ int first, int last_odd)
{
- doc_read_data_area(docg3, buf, len, first);
+ if (last_odd && len > 0) {
+ doc_read_data_area(docg3, buf, 1, first);
+ doc_read_data_area(docg3, buf ? buf + 1 : buf, len - 1, 0);
+ } else {
+ doc_read_data_area(docg3, buf, len, first);
+ }
doc_delay(docg3, 2);
return len;
}
@@ -850,6 +862,7 @@ static int doc_read_oob(struct mtd_info *mtd, loff_t from,
u8 *buf = ops->datbuf;
size_t len, ooblen, nbdata, nboob;
u8 hwecc[DOC_ECC_BCH_SIZE], eccconf1;
+ int max_bitflips = 0;
if (buf)
len = ops->len;
@@ -876,7 +889,7 @@ static int doc_read_oob(struct mtd_info *mtd, loff_t from,
ret = 0;
skip = from % DOC_LAYOUT_PAGE_SIZE;
mutex_lock(&docg3->cascade->lock);
- while (!ret && (len > 0 || ooblen > 0)) {
+ while (ret >= 0 && (len > 0 || ooblen > 0)) {
calc_block_sector(from - skip, &block0, &block1, &page, &ofs,
docg3->reliable);
nbdata = min_t(size_t, len, DOC_LAYOUT_PAGE_SIZE - skip);
@@ -887,20 +900,20 @@ static int doc_read_oob(struct mtd_info *mtd, loff_t from,
ret = doc_read_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES);
if (ret < 0)
goto err_in_read;
- ret = doc_read_page_getbytes(docg3, skip, NULL, 1);
+ ret = doc_read_page_getbytes(docg3, skip, NULL, 1, 0);
if (ret < skip)
goto err_in_read;
- ret = doc_read_page_getbytes(docg3, nbdata, buf, 0);
+ ret = doc_read_page_getbytes(docg3, nbdata, buf, 0, skip % 2);
if (ret < nbdata)
goto err_in_read;
doc_read_page_getbytes(docg3,
DOC_LAYOUT_PAGE_SIZE - nbdata - skip,
- NULL, 0);
- ret = doc_read_page_getbytes(docg3, nboob, oobbuf, 0);
+ NULL, 0, (skip + nbdata) % 2);
+ ret = doc_read_page_getbytes(docg3, nboob, oobbuf, 0, 0);
if (ret < nboob)
goto err_in_read;
doc_read_page_getbytes(docg3, DOC_LAYOUT_OOB_SIZE - nboob,
- NULL, 0);
+ NULL, 0, nboob % 2);
doc_get_bch_hw_ecc(docg3, hwecc);
eccconf1 = doc_register_readb(docg3, DOC_ECCCONF1);
@@ -936,7 +949,8 @@ static int doc_read_oob(struct mtd_info *mtd, loff_t from,
}
if (ret > 0) {
mtd->ecc_stats.corrected += ret;
- ret = -EUCLEAN;
+ max_bitflips = max(max_bitflips, ret);
+ ret = max_bitflips;
}
}
@@ -1004,7 +1018,7 @@ static int doc_reload_bbt(struct docg3 *docg3)
DOC_LAYOUT_PAGE_SIZE);
if (!ret)
doc_read_page_getbytes(docg3, DOC_LAYOUT_PAGE_SIZE,
- buf, 1);
+ buf, 1, 0);
buf += DOC_LAYOUT_PAGE_SIZE;
}
doc_read_page_finish(docg3);
@@ -1064,10 +1078,10 @@ static int doc_get_erase_count(struct docg3 *docg3, loff_t from)
ret = doc_reset_seq(docg3);
if (!ret)
ret = doc_read_page_prepare(docg3, block0, block1, page,
- ofs + DOC_LAYOUT_WEAR_OFFSET);
+ ofs + DOC_LAYOUT_WEAR_OFFSET, 0);
if (!ret)
ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_WEAR_SIZE,
- buf, 1);
+ buf, 1, 0);
doc_read_page_finish(docg3);
if (ret || (buf[0] != DOC_ERASE_MARK) || (buf[2] != DOC_ERASE_MARK))