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| author | Anatolij Gustschin <agust@denx.de> | 2012-08-09 08:18:12 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2012-08-13 14:34:35 +0200 |
| commit | 66863b0538d3667a0a4bb64b0eb9197aea27f855 (patch) | |
| tree | 636fe1a955a7ff4884a164ab069b86668676a208 /drivers | |
| parent | b4f106be2d8a4eb34ce41c5306d5a4fcc37e60e3 (diff) | |
| download | u-boot-imx-66863b0538d3667a0a4bb64b0eb9197aea27f855.zip u-boot-imx-66863b0538d3667a0a4bb64b0eb9197aea27f855.tar.gz u-boot-imx-66863b0538d3667a0a4bb64b0eb9197aea27f855.tar.bz2 | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index 35294bc..50df9b0 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -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; } |