From 90447ecbbac8572457b6d8903073ac3f120995ba Mon Sep 17 00:00:00 2001 From: Tor Krill Date: Fri, 28 Mar 2008 11:29:10 +0100 Subject: [PATCH] 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 --- drivers/mtd/cfi_flash.c | 44 +++++++++++++++++++++++++++++++-------- drivers/mtd/jedec_flash.c | 19 +++++++++++++++++ 2 files changed, 54 insertions(+), 9 deletions(-) diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index f04c72d05a..3f8911eb87 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -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); } diff --git a/drivers/mtd/jedec_flash.c b/drivers/mtd/jedec_flash.c index 41aad3bd6a..b958d1723a 100644 --- a/drivers/mtd/jedec_flash.c +++ b/drivers/mtd/jedec_flash.c @@ -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) -- 2.25.1