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cfi_flash: add support for Spansion flash PPB sector protection 

Erasing flash sectors protected with persistent protection bit (PPB)
mechanism on Spansion flash chips doesn't work. Add sector protection
status checking and sector lock and unlock commands to fix this.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Anatolij Gustschin 2012-08-09 08:18:12 +02:00 committed by Stefan Roese
parent b4f106be2d
commit 66863b0538
2 changed files with 59 additions and 0 deletions
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52
drivers/mtd/cfi_flash.c
View File

@ -1447,6 +1447,47 @@ int flash_real_protect (flash_info_t * info, long sector, int prot)
0, ATM_CMD_UNLOCK_SECT);
}
}
if (info->manufacturer_id == (uchar)AMD_MANUFACT) {
int flag = disable_interrupts();
int lock_flag;
flash_unlock_seq(info, 0);
flash_write_cmd(info, 0, info->addr_unlock1,
AMD_CMD_SET_PPB_ENTRY);
lock_flag = flash_isset(info, sector, 0, 0x01);
if (prot) {
if (lock_flag) {
flash_write_cmd(info, sector, 0,
AMD_CMD_PPB_LOCK_BC1);
flash_write_cmd(info, sector, 0,
AMD_CMD_PPB_LOCK_BC2);
}
debug("sector %ld %slocked\n", sector,
lock_flag ? "" : "already ");
} else {
if (!lock_flag) {
debug("unlock %ld\n", sector);
flash_write_cmd(info, 0, 0,
AMD_CMD_PPB_UNLOCK_BC1);
flash_write_cmd(info, 0, 0,
AMD_CMD_PPB_UNLOCK_BC2);
}
debug("sector %ld %sunlocked\n", sector,
!lock_flag ? "" : "already ");
}
if (flag)
enable_interrupts();
if (flash_status_check(info, sector,
info->erase_blk_tout,
prot ? "protect" : "unprotect"))
printf("status check error\n");
flash_write_cmd(info, 0, 0,
AMD_CMD_SET_PPB_EXIT_BC1);
flash_write_cmd(info, 0, 0,
AMD_CMD_SET_PPB_EXIT_BC2);
}
break;
#ifdef CONFIG_FLASH_CFI_LEGACY
case CFI_CMDSET_AMD_LEGACY:
@ -1635,6 +1676,17 @@ static int cmdset_amd_init(flash_info_t *info, struct cfi_qry *qry)
cmdset_amd_read_jedec_ids(info);
flash_write_cmd(info, 0, info->cfi_offset, FLASH_CMD_CFI);
#ifdef CONFIG_SYS_FLASH_PROTECTION
if (info->ext_addr && info->manufacturer_id == (uchar)AMD_MANUFACT) {
ushort spus;
/* read sector protect/unprotect scheme */
spus = flash_read_uchar(info, info->ext_addr + 9);
if (spus == 0x8)
info->legacy_unlock = 1;
}
#endif
return 0;
}

7
include/mtd/cfi_flash.h
View File

@ -60,6 +60,13 @@
#define AMD_CMD_UNLOCK_ACK 0x55
#define AMD_CMD_WRITE_TO_BUFFER 0x25
#define AMD_CMD_WRITE_BUFFER_CONFIRM 0x29
#define AMD_CMD_SET_PPB_ENTRY 0xC0
#define AMD_CMD_SET_PPB_EXIT_BC1 0x90
#define AMD_CMD_SET_PPB_EXIT_BC2 0x00
#define AMD_CMD_PPB_UNLOCK_BC1 0x80
#define AMD_CMD_PPB_UNLOCK_BC2 0x30
#define AMD_CMD_PPB_LOCK_BC1 0xA0
#define AMD_CMD_PPB_LOCK_BC2 0x00
#define AMD_STATUS_TOGGLE 0x40
#define AMD_STATUS_ERROR 0x20