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cfi_flash: Read PPB sector protection from device for AMD/Spansion chips

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Patch 66863b05 [cfi_flash: add support for Spansion flash PPB sector
protection] introduced the PPB (Persistent Protection Bit) locking for
Spansion chips. But right now the sector protection status (locked vs
unlocked) is set to unlocked for all sectors upon bootup. The real
sector protection status is ignored.

This patch now reads the current sector protection status and uses
it for these AMD/Spansion flash chips.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Holger Brunck <holger.brunck@keymile.com>
Tested-by: Holger Brunck <holger.brunck@keymile.com>
This commit is contained in:
Stefan Roese 2012-12-06 15:44:10 +01:00
parent 20043a4c3c
commit 03deff433e
1 changed files with 21 additions and 0 deletions
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21
drivers/mtd/cfi_flash.c
View File

@ -2183,6 +2183,27 @@ ulong flash_get_size (phys_addr_t base, int banknum)
FLASH_OFFSET_PROTECT,
FLASH_STATUS_PROTECT);
break;
case CFI_CMDSET_AMD_EXTENDED:
case CFI_CMDSET_AMD_STANDARD:
if (!manufact_match(info, AMD_MANUFACT)) {
/* default: not protected */
info->protect[sect_cnt] = 0;
break;
}
/* Read protection (PPB) from sector */
flash_write_cmd(info, 0, 0,
info->cmd_reset);
flash_unlock_seq(info, 0);
flash_write_cmd(info, 0,
info->addr_unlock1,
FLASH_CMD_READ_ID);
info->protect[sect_cnt] =
flash_isset(
info, sect_cnt,
FLASH_OFFSET_PROTECT,
FLASH_STATUS_PROTECT);
break;
default:
/* default: not protected */
info->protect[sect_cnt] = 0;