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authorChuanxiao Dong <chuanxiao.dong@intel.com>2010-08-11 17:14:59 +0800
committerDavid Woodhouse <David.Woodhouse@intel.com>2010-08-12 11:10:37 +0100
commitf0bc0c778fe12e43658193fae975fc5762e98773 (patch)
tree9d387a0de47c05cfef548cdaa149317aeb8ab51c /drivers/mtd
parentb292c341e2304b1d937843711c63d1e141d7b589 (diff)
downloadop-kernel-dev-f0bc0c778fe12e43658193fae975fc5762e98773.zip
op-kernel-dev-f0bc0c778fe12e43658193fae975fc5762e98773.tar.gz
nand/denali: change read_status function method
In mtd->write, Denali controller will use MODE_11 mode to read NAND flash status, then return back to MODE_1O mode to do page write. Here comes a bug for this kind of using, sometimes controller will not write data to NAND and just return a good interrupt to tell driver writing work is done. The data in this page is all 0xff and this page can not be written again. The reason is unknow. So read Denali controller register WRITE_PROTECT to get NAND status instead. Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/denali.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 3ba8952..975a893 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -169,13 +169,11 @@ static void read_status(struct denali_nand_info *denali)
/* initialize the data buffer to store status */
reset_buf(denali);
- /* initiate a device status read */
- cmd = MODE_11 | BANK(denali->flash_bank);
- index_addr(denali, cmd | COMMAND_CYCLE, 0x70);
- iowrite32(cmd | STATUS_CYCLE, denali->flash_mem);
-
- /* update buffer with status value */
- write_byte_to_buf(denali, ioread32(denali->flash_mem + 0x10));
+ cmd = ioread32(denali->flash_reg + WRITE_PROTECT);
+ if (cmd)
+ write_byte_to_buf(denali, NAND_STATUS_WP);
+ else
+ write_byte_to_buf(denali, 0);
}
/* resets a specific device connected to the core */
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