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cfi_flash: Enable PPB protection for all AMD cmdset flash chips

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Not only Spansion supports the Persistent Protection Bits (PPB) locking.
Other devices like the Micron JS28F512M29EWx also support this type
of locking/unlocking. Detection of support is done in the same way as
done for the Spansion chips - via the 0x49 CFI word.

This patch enables this PPB protection mechanism for all AMD type
(AMD commandset) 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 15:44:11 +01:00
parent 03deff433e
commit ac6b911514
1 changed files with 5 additions and 8 deletions
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13
drivers/mtd/cfi_flash.c
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@ -1511,7 +1511,7 @@ int flash_real_protect (flash_info_t * info, long sector, int prot)
0, ATM_CMD_UNLOCK_SECT);
}
}
if (manufact_match(info, AMD_MANUFACT)) {
if (info->legacy_unlock) {
int flag = disable_interrupts();
int lock_flag;
@ -1742,12 +1742,9 @@ static int cmdset_amd_init(flash_info_t *info, struct cfi_qry *qry)
flash_write_cmd(info, 0, info->cfi_offset, FLASH_CMD_CFI);
#ifdef CONFIG_SYS_FLASH_PROTECTION
if (info->ext_addr && manufact_match(info, AMD_MANUFACT)) {
ushort spus;
/* read sector protect/unprotect scheme */
spus = flash_read_uchar(info, info->ext_addr + 9);
if (spus == 0x8)
if (info->ext_addr) {
/* read sector protect/unprotect scheme (at 0x49) */
if (flash_read_uchar(info, info->ext_addr + 9) == 0x8)
info->legacy_unlock = 1;
}
#endif
@ -2185,7 +2182,7 @@ ulong flash_get_size (phys_addr_t base, int banknum)
break;
case CFI_CMDSET_AMD_EXTENDED:
case CFI_CMDSET_AMD_STANDARD:
if (!manufact_match(info, AMD_MANUFACT)) {
if (!info->legacy_unlock) {
/* default: not protected */
info->protect[sect_cnt] = 0;
break;