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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>
This commit is contained in:
Chuanxiao Dong 2010-08-11 17:14:59 +08:00 committed by David Woodhouse
parent b292c341e2
commit f0bc0c778f
1 changed files with 5 additions and 7 deletions
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12
drivers/mtd/nand/denali.c
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@ -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 */