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authorJagannadha Sutradharudu Teki <jagannadha.sutradharudu-teki@xilinx.com>2013-03-01 16:54:26 +0530
committerStefan Roese <sr@denx.de>2013-04-02 14:27:54 +0200
commitc502321c4a1bc8d859ecf19b22f9d0ce03954fd6 (patch)
tree60a9af431831e0bf7add56cf280b905a0daf07e2 /drivers/mtd
parent239cb9d904cfa8ab50d840a47b3306189d695c75 (diff)
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mtd: cfi_flash: Write buffer size adjustment for M29EW Numonyx devices
This patch addjusted the write buffer size for M29EW devices those are operated in 8-bit mode. The M29EW devices seem to report the CFI information wrong when it's in 8 bit mode. There's an app note from Numonyx on this issue and there's a patch in the open source as well for Linux, but it doesn't seem to be in mainline. Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Tested-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/cfi_flash.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index 6b9fc1a..328c76d 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -2053,6 +2053,26 @@ static void flash_fixup_sst(flash_info_t *info, struct cfi_qry *qry)
}
}
+static void flash_fixup_num(flash_info_t *info, struct cfi_qry *qry)
+{
+ /*
+ * The M29EW devices seem to report the CFI information wrong
+ * when it's in 8 bit mode.
+ * There's an app note from Numonyx on this issue.
+ * So adjust the buffer size for M29EW while operating in 8-bit mode
+ */
+ if (((qry->max_buf_write_size) > 0x8) &&
+ (info->device_id == 0x7E) &&
+ (info->device_id2 == 0x2201 ||
+ info->device_id2 == 0x2301 ||
+ info->device_id2 == 0x2801 ||
+ info->device_id2 == 0x4801)) {
+ debug("Adjusted buffer size on Numonyx flash"
+ " M29EW family in 8 bit mode\n");
+ qry->max_buf_write_size = 0x8;
+ }
+}
+
/*
* The following code cannot be run from FLASH!
*
@@ -2135,6 +2155,9 @@ ulong flash_get_size (phys_addr_t base, int banknum)
case 0x00bf: /* SST */
flash_fixup_sst(info, &qry);
break;
+ case 0x0089: /* Numonyx */
+ flash_fixup_num(info, &qry);
+ break;
}
debug ("manufacturer is %d\n", info->vendor);