mtd: cfi_flash: Fix CFI flash driver for 8-bit bus support

This commit is based on that patch from aaron.williams@caviumnetworks.com
with same commit title. pulled the same code changes into current u-boot tree.

http://patchwork.ozlabs.org/patch/140863/
http://lists.denx.de/pipermail/u-boot/2011-April/089606.html

This patch corrects the addresses used when working with Spansion/AMD FLASH chips.
Addressing for 8 and 16 bits is almost identical except in the 16-bit case the
LSB of the address is always 0.  The confusion arose because the addresses
in the datasheet for 16-bit mode are word addresses but this code assumed it was
byte addresses.

I have only been able to test this on our Octeon boards which use either an 8-bit
or 16-bit bus.  I have not tested the case where there's an 8-bit part on a 16-bit
bus.

This patch also adds some delays as suggested by Spansion.

If a part can be both 8 and 16-bits, it forces it to work in 8-bit mode if an
8-bit bus is detected.

Apart from the pulled changes, fixed few minor code cleanups and tested
on 256M29EW, 512M29EW flashes.

Before this fix:
---------------
Bank # 1: CFI conformant flash (8 x 8)  Size: 64 MB in 512 Sectors
  AMD Standard command set, Manufacturer ID: 0xFF, Device ID: 0xFF
  Erase timeout: 4096 ms, write timeout: 2 ms
  Buffer write timeout: 5 ms, buffer size: 1024 bytes

After this fix:
--------------
Bank # 1: CFI conformant flash (8 x 8)  Size: 64 MB in 512 Sectors
  AMD Standard command set, Manufacturer ID: 0x89, Device ID: 0x7E2301
  Erase timeout: 4096 ms, write timeout: 2 ms
  Buffer write timeout: 5 ms, buffer size: 1024 bytes

Signed-off-by: Aaron Williams <aaron.williams@caviumnetworks.com>
Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Tested-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>

1 files changed, 21 insertions, 20 deletions

diff --git a/include/mtd/cfi_flash.h b/include/mtd/cfi_flash.h
index 966b5e00ca..9bd76eb976 100644
--- a/include/mtd/cfi_flash.h
+++ b/include/mtd/cfi_flash.h
@@ -78,29 +78,30 @@
 #define FLASH_CONTINUATION_CODE		0x7F
 
 #define FLASH_OFFSET_MANUFACTURER_ID	0x00
-#define FLASH_OFFSET_DEVICE_ID		0x01
-#define FLASH_OFFSET_DEVICE_ID2		0x0E
-#define FLASH_OFFSET_DEVICE_ID3		0x0F
-#define FLASH_OFFSET_CFI		0x55
+#define FLASH_OFFSET_DEVICE_ID		0x02
+#define FLASH_OFFSET_DEVICE_ID2		0x1C
+#define FLASH_OFFSET_DEVICE_ID3		0x1E
+#define FLASH_OFFSET_CFI		0xAA
+
 #define FLASH_OFFSET_CFI_ALT		0x555
-#define FLASH_OFFSET_CFI_RESP		0x10
-#define FLASH_OFFSET_PRIMARY_VENDOR	0x13
+#define FLASH_OFFSET_CFI_RESP          0x20
+#define FLASH_OFFSET_PRIMARY_VENDOR    0x26
 /* extended query table primary address */
-#define FLASH_OFFSET_EXT_QUERY_T_P_ADDR	0x15
+#define FLASH_OFFSET_EXT_QUERY_T_P_ADDR   0x2A
 #define FLASH_OFFSET_WTOUT		0x1F
-#define FLASH_OFFSET_WBTOUT		0x20
-#define FLASH_OFFSET_ETOUT		0x21
-#define FLASH_OFFSET_CETOUT		0x22
-#define FLASH_OFFSET_WMAX_TOUT		0x23
-#define FLASH_OFFSET_WBMAX_TOUT		0x24
-#define FLASH_OFFSET_EMAX_TOUT		0x25
-#define FLASH_OFFSET_CEMAX_TOUT		0x26
-#define FLASH_OFFSET_SIZE		0x27
-#define FLASH_OFFSET_INTERFACE		0x28
-#define FLASH_OFFSET_BUFFER_SIZE	0x2A
-#define FLASH_OFFSET_NUM_ERASE_REGIONS	0x2C
-#define FLASH_OFFSET_ERASE_REGIONS	0x2D
-#define FLASH_OFFSET_PROTECT		0x02
+#define FLASH_OFFSET_WBTOUT            0x40
+#define FLASH_OFFSET_ETOUT             0x4A
+#define FLASH_OFFSET_CETOUT            0x44
+#define FLASH_OFFSET_WMAX_TOUT         0x46
+#define FLASH_OFFSET_WBMAX_TOUT		0x48
+#define FLASH_OFFSET_EMAX_TOUT         0x4A
+#define FLASH_OFFSET_CEMAX_TOUT		0x4C
+#define FLASH_OFFSET_SIZE              0x4E
+#define FLASH_OFFSET_INTERFACE         0x50
+#define FLASH_OFFSET_BUFFER_SIZE       0x54
+#define FLASH_OFFSET_NUM_ERASE_REGIONS 0x58
+#define FLASH_OFFSET_ERASE_REGIONS     0x5A
+#define FLASH_OFFSET_PROTECT           0x04
 #define FLASH_OFFSET_USER_PROTECTION	0x85
 #define FLASH_OFFSET_INTEL_PROTECTION	0x81