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authorJoe Hershberger <joe.hershberger@ni.com>2012-08-22 16:49:42 -0500
committerScott Wood <scottwood@freescale.com>2012-09-17 17:32:10 -0500
commiteee623a5049963d0c085be37128bbd22bee1ba1e (patch)
tree315346f1597dbeebd2a0d071325bac7fea9de16f /drivers/mtd
parentd62e9caaaf7e6f5c7d86c9ea19170bfa5adda8be (diff)
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nand: Add support for unlock.invert
NAND unlock command allows an invert bit to be set to unlock all but the selected page range. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com> [scottwood@freescale.com: updated docs and added comment about invert bit] Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/nand_util.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/mtd/nand/nand_util.c b/drivers/mtd/nand/nand_util.c
index 7ed8b18..c66eeef 100644
--- a/drivers/mtd/nand/nand_util.c
+++ b/drivers/mtd/nand/nand_util.c
@@ -317,18 +317,20 @@ int nand_get_lock_status(struct mtd_info *mtd, loff_t offset)
* @param start start byte address
* @param length number of bytes to unlock (must be a multiple of
* page size nand->writesize)
+ * @param allexcept if set, unlock everything not selected
*
* @return 0 on success, -1 in case of error
*/
-int nand_unlock(struct mtd_info *mtd, ulong start, ulong length)
+int nand_unlock(struct mtd_info *mtd, ulong start, ulong length, int allexcept)
{
int ret = 0;
int chipnr;
int status;
int page;
struct nand_chip *chip = mtd->priv;
- printf ("nand_unlock: start: %08x, length: %d!\n",
- (int)start, (int)length);
+
+ debug("nand_unlock%s: start: %08x, length: %d!\n",
+ allexcept ? " (allexcept)" : "", start, length);
/* select the NAND device */
chipnr = (int)(start >> chip->chip_shift);
@@ -368,6 +370,15 @@ int nand_unlock(struct mtd_info *mtd, ulong start, ulong length)
/* submit ADDRESS of LAST page to unlock */
page += (int)(length >> chip->page_shift);
+
+ /*
+ * Page addresses for unlocking are supposed to be block-aligned.
+ * At least some NAND chips use the low bit to indicate that the
+ * page range should be inverted.
+ */
+ if (allexcept)
+ page |= 1;
+
chip->cmdfunc(mtd, NAND_CMD_UNLOCK2, -1, page & chip->pagemask);
/* call wait ready function */