diff options
Diffstat (limited to 'drivers/mtd/cfi_flash.c')
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index 1191ef02f..44ebb9d06 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -1355,15 +1355,32 @@ int flash_real_protect (flash_info_t * info, long sector, int prot) case CFI_CMDSET_INTEL_PROG_REGIONS: case CFI_CMDSET_INTEL_STANDARD: case CFI_CMDSET_INTEL_EXTENDED: - 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 + /* + * see errata called + * "Numonyx Axcell P33/P30 Specification Update" :) + */ + flash_write_cmd (info, sector, 0, FLASH_CMD_READ_ID); + if (!flash_isequal (info, sector, FLASH_OFFSET_PROTECT, + prot)) { + /* + * cmd must come before FLASH_CMD_PROTECT + 20us + * Disable interrupts which might cause a timeout here. + */ + int flag = disable_interrupts (); + unsigned short cmd; + + if (prot) + cmd = FLASH_CMD_PROTECT_SET; + else + cmd = FLASH_CMD_PROTECT_CLEAR; + flash_write_cmd (info, sector, 0, - FLASH_CMD_PROTECT_CLEAR); + FLASH_CMD_PROTECT); + flash_write_cmd (info, sector, 0, cmd); + /* re-enable interrupts if necessary */ + if (flag) + enable_interrupts (); + } break; case CFI_CMDSET_AMD_EXTENDED: case CFI_CMDSET_AMD_STANDARD: |