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authorAdrian Hunter <ext-adrian.hunter@nokia.com>2007-01-25 14:06:33 +0900
committerKyungmin Park <kyungmin.park@samsung.com>2007-01-25 14:06:33 +0900
commit8b29c0b6eb3a4952e7eae03038bbf6c1695dfe80 (patch)
treee6667249d596585dcf1b86d1639cdd47b13ab8c7 /drivers/mtd
parentec255e34061bbc48fc702875336c6db969df9461 (diff)
downloadop-kernel-dev-8b29c0b6eb3a4952e7eae03038bbf6c1695dfe80.zip
op-kernel-dev-8b29c0b6eb3a4952e7eae03038bbf6c1695dfe80.tar.gz
[MTD] OneNAND: Amend write-verify to compare to original buffer
When write-verify is enabled (CONFIG_MTD_ONENAND_VERIFY_WRITE), the data written is read back and compared. The comparison was being made between dataRAM buffers, but this does not verify that the data made it to the dataRAM correctly in the first place. This patch amends write-verify to compare back to the original buffer. It also now verifies sub-page writes. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/onenand/onenand_base.c52
1 files changed, 31 insertions, 21 deletions
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 0249b4a..65acb85 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -909,41 +909,51 @@ static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to
}
/**
- * onenand_verify_page - [GENERIC] verify the chip contents after a write
- * @param mtd MTD device structure
- * @param buf the databuffer to verify
+ * onenand_verify - [GENERIC] verify the chip contents after a write
+ * @param mtd MTD device structure
+ * @param buf the databuffer to verify
+ * @param addr offset to read from
+ * @param len number of bytes to read and compare
*
- * Check DataRAM area directly
*/
-static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, loff_t addr)
+static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, size_t len)
{
struct onenand_chip *this = mtd->priv;
- void __iomem *dataram0, *dataram1;
+ void __iomem *dataram;
int ret = 0;
+ int thislen, column;
- /* In partial page write, just skip it */
- if ((addr & (mtd->writesize - 1)) != 0)
- return 0;
+ while (len != 0) {
+ thislen = min_t(int, mtd->writesize, len);
+ column = addr & (mtd->writesize - 1);
+ if (column + thislen > mtd->writesize)
+ thislen = mtd->writesize - column;
- this->command(mtd, ONENAND_CMD_READ, addr, mtd->writesize);
+ this->command(mtd, ONENAND_CMD_READ, addr, mtd->writesize);
- ret = this->wait(mtd, FL_READING);
- if (ret)
- return ret;
+ onenand_update_bufferram(mtd, addr, 0);
+
+ ret = this->wait(mtd, FL_READING);
+ if (ret)
+ return ret;
- onenand_update_bufferram(mtd, addr, 1);
+ onenand_update_bufferram(mtd, addr, 1);
- /* Check, if the two dataram areas are same */
- dataram0 = this->base + ONENAND_DATARAM;
- dataram1 = dataram0 + mtd->writesize;
+ dataram = this->base + ONENAND_DATARAM;
+ dataram += onenand_bufferram_offset(mtd, ONENAND_DATARAM);
- if (memcmp(dataram0, dataram1, mtd->writesize))
- return -EBADMSG;
+ if (memcmp(buf, dataram + column, thislen))
+ return -EBADMSG;
+
+ len -= thislen;
+ buf += thislen;
+ addr += thislen;
+ }
return 0;
}
#else
-#define onenand_verify_page(...) (0)
+#define onenand_verify(...) (0)
#define onenand_verify_oob(...) (0)
#endif
@@ -1025,7 +1035,7 @@ static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
}
/* Only check verify write turn on */
- ret = onenand_verify_page(mtd, (u_char *) wbuf, to);
+ ret = onenand_verify(mtd, (u_char *) wbuf, to, thislen);
if (ret) {
DEBUG(MTD_DEBUG_LEVEL0, "onenand_write: verify failed %d\n", ret);
break;
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