diff options
Diffstat (limited to 'board/pm520/flash.c')
| -rw-r--r-- | board/pm520/flash.c | 97 |
1 files changed, 95 insertions, 2 deletions
diff --git a/board/pm520/flash.c b/board/pm520/flash.c index 572cc9b..62700f9 100644 --- a/board/pm520/flash.c +++ b/board/pm520/flash.c @@ -75,6 +75,8 @@ static ulong flash_get_size (FPW *addr, flash_info_t *info); static int write_data (flash_info_t *info, ulong dest, FPW data); static void flash_get_offsets (ulong base, flash_info_t *info); void inline spin_wheel (void); +static void flash_sync_real_protect (flash_info_t * info); +static unsigned char intel_sector_protected (flash_info_t *info, ushort sector); /*----------------------------------------------------------------------- */ @@ -101,6 +103,9 @@ unsigned long flash_init (void) break; } size += flash_info[i].size; + + /* get the h/w and s/w protection status in sync */ + flash_sync_real_protect(&flash_info[i]); } /* Protect monitor and environment sectors @@ -138,7 +143,6 @@ static void flash_get_offsets (ulong base, flash_info_t *info) if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) { for (i = 0; i < info->sector_count; i++) { info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE); - info->protect[i] = 0; } } } @@ -270,6 +274,85 @@ static ulong flash_get_size (FPW *addr, flash_info_t *info) } +/* + * This function gets the u-boot flash sector protection status + * (flash_info_t.protect[]) in sync with the sector protection + * status stored in hardware. + */ +static void flash_sync_real_protect (flash_info_t * info) +{ + int i; + + switch (info->flash_id & FLASH_TYPEMASK) { + + case FLASH_28F128J3A: + case FLASH_28F640J3A: + case FLASH_28F320J3A: + for (i = 0; i < info->sector_count; ++i) { + info->protect[i] = intel_sector_protected(info, i); + } + break; + default: + /* no h/w protect support */ + break; + } +} + + +/* + * checks if "sector" in bank "info" is protected. Should work on intel + * strata flash chips 28FxxxJ3x in 8-bit mode. + * Returns 1 if sector is protected (or timed-out while trying to read + * protection status), 0 if it is not. + */ +static unsigned char intel_sector_protected (flash_info_t *info, ushort sector) +{ + FPWV *addr; + FPWV *lock_conf_addr; + ulong start; + unsigned char ret; + + /* + * first, wait for the WSM to be finished. The rationale for + * waiting for the WSM to become idle for at most + * CFG_FLASH_ERASE_TOUT is as follows. The WSM can be busy + * because of: (1) erase, (2) program or (3) lock bit + * configuration. So we just wait for the longest timeout of + * the (1)-(3), i.e. the erase timeout. + */ + + /* wait at least 35ns (W12) before issuing Read Status Register */ + udelay(1); + addr = (FPWV *) info->start[sector]; + *addr = (FPW) INTEL_STATUS; + + start = get_timer (0); + while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) { + if (get_timer (start) > CFG_FLASH_ERASE_TOUT) { + *addr = (FPW) INTEL_RESET; /* restore read mode */ + printf("WSM busy too long, can't get prot status\n"); + return 1; + } + } + + /* issue the Read Identifier Codes command */ + *addr = (FPW) INTEL_READID; + + /* wait at least 35ns (W12) before reading */ + udelay(1); + + /* Intel example code uses offset of 2 for 16 bit flash */ + lock_conf_addr = (FPWV *) info->start[sector] + 2; + ret = (*lock_conf_addr & (FPW) INTEL_PROTECT) ? 1 : 0; + + /* put flash back in read mode */ + *addr = (FPW) INTEL_RESET; + + return ret; +} + + + /*----------------------------------------------------------------------- */ @@ -491,7 +574,7 @@ void inline spin_wheel (void) * 0 - OK * 1 - Error (timeout, voltage problems, etc.) */ -int flash_real_protect(flash_info_t *info, long sector, int prot) +int flash_real_protect (flash_info_t *info, long sector, int prot) { ulong start; int i; @@ -531,6 +614,11 @@ int flash_real_protect(flash_info_t *info, long sector, int prot) /* * Clear lock bit command clears all sectors lock bits, so * we have to restore lock bits of protected sectors. + * WARNING: code below re-locks sectors only for one bank (info). + * This causes problems on boards where several banks share + * the same chip, as sectors in othere banks will be unlocked + * but not re-locked. It works fine on pm520 though, as there + * is only one chip and one bank. */ if (!prot) { @@ -553,6 +641,11 @@ int flash_real_protect(flash_info_t *info, long sector, int prot) } } } + /* + * get the s/w sector protection status in sync with the h/w, + * in case something went wrong during the re-locking. + */ + flash_sync_real_protect(info); /* resets flash to read mode */ } if (flag) |