diff options
| author | Tor Krill <tor@excito.com> | 2008-03-28 11:29:10 +0100 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2008-03-28 11:44:23 +0100 |
| commit | 90447ecbbac8572457b6d8903073ac3f120995ba (patch) | |
| tree | d2810fc72c7f1af271d89685a5d6205094beea28 /drivers/mtd/cfi_flash.c | |
| parent | 74d1e66d22dac91388bc538b2fe19f735edc5b82 (diff) | |
MTD/CFI: Add support for 16bit legacy AMD flash
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>
Diffstat (limited to 'drivers/mtd/cfi_flash.c')
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 44 |
1 files changed, 35 insertions, 9 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index f04c72d05..3f8911eb8 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -365,6 +365,20 @@ static inline uchar flash_read_uchar (flash_info_t * info, uint offset) } /*----------------------------------------------------------------------- + * 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); } |