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MTD/CFI: Add support for 16bit legacy AMD flash

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Add entry for 512Kx16 AMD flash to jedec_table.
Read out 16bit device id if chipwidth is 16bit.
Fixed coding style after Stefans feedback

Signed-off-by: Tor Krill <tor@excito.com>
This commit is contained in:
Tor Krill 2008-03-28 11:29:10 +01:00 committed by Stefan Roese
parent 74d1e66d22
commit 90447ecbba
2 changed files with 54 additions and 9 deletions
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44
drivers/mtd/cfi_flash.c
View File

@ -364,6 +364,20 @@ static inline uchar flash_read_uchar (flash_info_t * info, uint offset)
return retval;
}
/*-----------------------------------------------------------------------
* read a word at a port width address, assume 16bit bus
*/
static inline ushort flash_read_word (flash_info_t * info, uint offset)
{
ushort *addr, retval;
addr = flash_map (info, 0, offset);
retval = flash_read16 (addr);
flash_unmap (info, 0, offset, addr);
return retval;
}
/*-----------------------------------------------------------------------
* read a long word by picking the least significant byte of each maximum
* port size word. Swap for ppc format.
@ -1449,17 +1463,29 @@ static void cmdset_amd_read_jedec_ids(flash_info_t *info)
flash_unlock_seq(info, 0);
flash_write_cmd(info, 0, info->addr_unlock1, FLASH_CMD_READ_ID);
udelay(1000); /* some flash are slow to respond */
info->manufacturer_id = flash_read_uchar (info,
FLASH_OFFSET_MANUFACTURER_ID);
info->device_id = flash_read_uchar (info,
FLASH_OFFSET_DEVICE_ID);
if (info->device_id == 0x7E) {
/* AMD 3-byte (expanded) device ids */
info->device_id2 = flash_read_uchar (info,
FLASH_OFFSET_DEVICE_ID2);
info->device_id2 <<= 8;
info->device_id2 |= flash_read_uchar (info,
FLASH_OFFSET_DEVICE_ID3);
switch (info->chipwidth){
case FLASH_CFI_8BIT:
info->device_id = flash_read_uchar (info,
FLASH_OFFSET_DEVICE_ID);
if (info->device_id == 0x7E) {
/* AMD 3-byte (expanded) device ids */
info->device_id2 = flash_read_uchar (info,
FLASH_OFFSET_DEVICE_ID2);
info->device_id2 <<= 8;
info->device_id2 |= flash_read_uchar (info,
FLASH_OFFSET_DEVICE_ID3);
}
break;
case FLASH_CFI_16BIT:
info->device_id = flash_read_word (info,
FLASH_OFFSET_DEVICE_ID);
break;
default:
break;
}
flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
}

19
drivers/mtd/jedec_flash.c
View File

@ -216,6 +216,25 @@ static const struct amd_flash_info jedec_table[] = {
}
},
#endif
#ifdef CFG_FLASH_LEGACY_512Kx16
{
.mfr_id = MANUFACTURER_AMD,
.dev_id = AM29LV400BB,
.name = "AMD AM29LV400BB",
.uaddr = {
[1] = MTD_UADDR_0x0555_0x02AA /* x16 */
},
.DevSize = SIZE_512KiB,
.CmdSet = CFI_CMDSET_AMD_LEGACY,
.NumEraseRegions= 4,
.regions = {
ERASEINFO(0x04000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x08000,1),
ERASEINFO(0x10000,7),
}
},
#endif
};
static inline void fill_info(flash_info_t *info, const struct amd_flash_info *jedec_entry, ulong base)