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cfi-flash: Added support to flash_real_protect for Atmel flash devices

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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>
This commit is contained in:
Rafael Campos 2008-07-31 10:22:20 +02:00 committed by Stefan Roese
parent 7949839e58
commit bc9019e197
1 changed files with 43 additions and 6 deletions
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49
drivers/mtd/cfi_flash.c
View file

@ -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,