diff options
| author | Rafael Campos <rafael.campos@hanscan.com> | 2008-07-31 10:22:20 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2008-08-06 14:22:41 +0200 |
| commit | bc9019e19758a19a388fb20ef18dc771cd39fdda (patch) | |
| tree | 2b47d4b039b04bc0244ca8a04a069306abf49097 /drivers/mtd | |
| parent | 7949839e5836bf8b1074bb6142c46d30ac3aa350 (diff) | |
| download | blackbird-obmc-uboot-bc9019e19758a19a388fb20ef18dc771cd39fdda.tar.gz blackbird-obmc-uboot-bc9019e19758a19a388fb20ef18dc771cd39fdda.zip | |
cfi-flash: Added support to flash_real_protect for Atmel flash devices
Some of the flash memories produced by ATMEL start in read-only mode.
We need to unprotect it. This patch allows the AT49BV6416 to work with
cfi_flash memories. Tested in the at91rm9200ek board.
Signed-off-by: Rafael Campos Las Heras <rafael.campos@hanscan.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 49 |
1 files changed, 43 insertions, 6 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index 12647ef986..31ee75607d 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -103,6 +103,10 @@ #define AMD_STATUS_TOGGLE 0x40 #define AMD_STATUS_ERROR 0x20 +#define ATM_CMD_UNLOCK_SECT 0x70 +#define ATM_CMD_SOFTLOCK_START 0x80 +#define ATM_CMD_LOCK_SECT 0x40 + #define FLASH_OFFSET_MANUFACTURER_ID 0x00 #define FLASH_OFFSET_DEVICE_ID 0x01 #define FLASH_OFFSET_DEVICE_ID2 0x0E @@ -1351,12 +1355,45 @@ int flash_real_protect (flash_info_t * info, long sector, int prot) { int retcode = 0; - flash_write_cmd (info, sector, 0, FLASH_CMD_CLEAR_STATUS); - flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT); - if (prot) - flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT_SET); - else - flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT_CLEAR); + switch (info->vendor) { + case CFI_CMDSET_INTEL_PROG_REGIONS: + case CFI_CMDSET_INTEL_STANDARD: + flash_write_cmd (info, sector, 0, + FLASH_CMD_CLEAR_STATUS); + flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT); + if (prot) + flash_write_cmd (info, sector, 0, + FLASH_CMD_PROTECT_SET); + else + flash_write_cmd (info, sector, 0, + FLASH_CMD_PROTECT_CLEAR); + break; + case CFI_CMDSET_AMD_EXTENDED: + case CFI_CMDSET_AMD_STANDARD: +#ifdef CONFIG_FLASH_CFI_LEGACY + case CFI_CMDSET_AMD_LEGACY: +#endif + /* U-Boot only checks the first byte */ + if (info->manufacturer_id == (uchar)ATM_MANUFACT) { + if (prot) { + flash_unlock_seq (info, 0); + flash_write_cmd (info, 0, + info->addr_unlock1, + ATM_CMD_SOFTLOCK_START); + flash_unlock_seq (info, 0); + flash_write_cmd (info, sector, 0, + ATM_CMD_LOCK_SECT); + } else { + flash_write_cmd (info, 0, + info->addr_unlock1, + AMD_CMD_UNLOCK_START); + if (info->device_id == ATM_ID_BV6416) + flash_write_cmd (info, sector, + 0, ATM_CMD_UNLOCK_SECT); + } + } + break; + }; if ((retcode = flash_full_status_check (info, sector, info->erase_blk_tout, |
