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.
Style modifications suggested by Stefan Roese.
Signed-off-by: Rafael Campos Las Heras <[EMAIL PROTECTED]>
---
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 12647ef..b72c144 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,
--
1.5.6.3
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