From bc9019e19758a19a388fb20ef18dc771cd39fdda Mon Sep 17 00:00:00 2001 From: Rafael Campos Date: Thu, 31 Jul 2008 10:22:20 +0200 Subject: [PATCH] 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 Signed-off-by: Stefan Roese --- drivers/mtd/cfi_flash.c | 49 ++++++++++++++++++++++++++++++++++++----- 1 file 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, -- 2.25.1