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Diffstat (limited to 'board/RPXClassic/flash.c')
| -rw-r--r-- | board/RPXClassic/flash.c | 447 |
1 files changed, 447 insertions, 0 deletions
diff --git a/board/RPXClassic/flash.c b/board/RPXClassic/flash.c new file mode 100644 index 0000000..6293497 --- /dev/null +++ b/board/RPXClassic/flash.c @@ -0,0 +1,447 @@ +/* + * (C) Copyright 2001 + * Stäubli Faverges - <www.staubli.com> + * Pierre AUBERT p.aubert@staubli.com + * U-Boot port on RPXClassic LF (CLLF_BW31) board + * + * RPXClassic uses Am29DL323B flash memory with 2 banks + * + * + * (C) Copyright 2000 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + + +#include <common.h> +#include <mpc8xx.h> + +flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */ + +/*----------------------------------------------------------------------- + * Functions + */ +static ulong flash_get_size (vu_long *addr, flash_info_t *info); +static int write_word (flash_info_t *info, ulong dest, ulong data); +static void flash_get_offsets (ulong base, flash_info_t *info); + +/*----------------------------------------------------------------------- + */ + +unsigned long flash_init (void) +{ + unsigned long size_b0 ; + int i; + + /* Init: no FLASHes known */ + for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) { + flash_info[i].flash_id = FLASH_UNKNOWN; + } + + size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]); + + + flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]); + +#if CFG_MONITOR_BASE >= CFG_FLASH_BASE + /* monitor protection ON by default */ + flash_protect(FLAG_PROTECT_SET, + CFG_MONITOR_BASE, + CFG_MONITOR_BASE+CFG_MONITOR_LEN-1, + &flash_info[0]); +#endif + + flash_info[0].size = size_b0; + + return (size_b0); +} + +/*----------------------------------------------------------------------- + */ +static void flash_get_offsets (ulong base, flash_info_t *info) +{ + int i; + + if (info->flash_id & FLASH_BTYPE) { + /* set sector offsets for bottom boot block type */ + info->start[0] = base + 0x00000000; + info->start[1] = base + 0x00008000; + info->start[2] = base + 0x00010000; + info->start[3] = base + 0x00018000; + info->start[4] = base + 0x00020000; + info->start[5] = base + 0x00028000; + info->start[6] = base + 0x00030000; + info->start[7] = base + 0x00038000; + for (i = 8; i < info->sector_count; i++) { + info->start[i] = base + ((i-7) * 0x00040000) ; + } + } +} + +/*----------------------------------------------------------------------- + */ +void flash_print_info (flash_info_t *info) +{ + int i; + + if (info->flash_id == FLASH_UNKNOWN) { + printf ("missing or unknown FLASH type\n"); + return; + } + + switch (info->flash_id & FLASH_VENDMASK) { + case FLASH_MAN_AMD: printf ("AMD "); break; + default: printf ("Unknown Vendor "); break; + } + + switch (info->flash_id & FLASH_TYPEMASK) { + case FLASH_AMDL323B: + printf ("AMDL323DB (16 Mbytes, bottom boot sect)\n"); + break; + default: + printf ("Unknown Chip Type\n"); + break; + } + + printf (" Size: %ld MB in %d Sectors\n", + info->size >> 20, info->sector_count); + + printf (" Sector Start Addresses:"); + for (i=0; i<info->sector_count; ++i) { + if ((i % 5) == 0) + printf ("\n "); + printf (" %08lX%s", + info->start[i], + info->protect[i] ? " (RO)" : " " + ); + } + printf ("\n"); +} + +/*----------------------------------------------------------------------- + */ + + +/*----------------------------------------------------------------------- + */ + +/* + * The following code cannot be run from FLASH! + */ + +static ulong flash_get_size (vu_long *addr, flash_info_t *info) +{ + short i; + ulong value; + ulong base = (ulong)addr; + + /* Reset flash componeny */ + addr [0] = 0xf0f0f0f0; + + /* Write auto select command: read Manufacturer ID */ + addr[0xAAA] = 0xAAAAAAAA ; + addr[0x555] = 0x55555555 ; + addr[0xAAA] = 0x90909090 ; + + value = addr[0] ; + + switch (value & 0x00FF00FF) { + case AMD_MANUFACT: + info->flash_id = FLASH_MAN_AMD; + break; + default: + info->flash_id = FLASH_UNKNOWN; + info->sector_count = 0; + info->size = 0; + return (0); /* no or unknown flash */ + } + + value = addr[2] ; /* device ID */ + + switch (value & 0x00FF00FF) { + case (AMD_ID_DL323B & 0x00FF00FF): + info->flash_id += FLASH_AMDL323B; + info->sector_count = 71; + info->size = 0x01000000; /* 16 Mb */ + + break; + default: + info->flash_id = FLASH_UNKNOWN; + return (0); /* => no or unknown flash */ + + } + /* set up sector start address table */ + /* set sector offsets for bottom boot block type */ + info->start[0] = base + 0x00000000; + info->start[1] = base + 0x00008000; + info->start[2] = base + 0x00010000; + info->start[3] = base + 0x00018000; + info->start[4] = base + 0x00020000; + info->start[5] = base + 0x00028000; + info->start[6] = base + 0x00030000; + info->start[7] = base + 0x00038000; + for (i = 8; i < info->sector_count; i++) { + info->start[i] = base + ((i-7) * 0x00040000) ; + } + + /* check for protected sectors */ + for (i = 0; i < 23; i++) { + /* read sector protection at sector address, (A7 .. A0) = 0x02 */ + /* D0 = 1 if protected */ + addr = (volatile unsigned long *)(info->start[i]); + info->protect[i] = addr[4] & 1 ; + } + /* Check for protected sectors in the 2nd bank */ + addr[0x100AAA] = 0xAAAAAAAA ; + addr[0x100555] = 0x55555555 ; + addr[0x100AAA] = 0x90909090 ; + + for (i = 23; i < info->sector_count; i++) { + /* read sector protection at sector address, (A7 .. A0) = 0x02 */ + /* D0 = 1 if protected */ + addr = (volatile unsigned long *)(info->start[i]); + info->protect[i] = addr[4] & 1 ; + } + + /* + * Prevent writes to uninitialized FLASH. + */ + if (info->flash_id != FLASH_UNKNOWN) { + addr = (volatile unsigned long *)info->start[0]; + + *addr = 0xF0F0F0F0; /* reset bank 1 */ + addr = (volatile unsigned long *)info->start[23]; + + *addr = 0xF0F0F0F0; /* reset bank 2 */ + + } + + return (info->size); +} + + +/*----------------------------------------------------------------------- + */ + +int flash_erase (flash_info_t *info, int s_first, int s_last) +{ + vu_long *addr = (vu_long*)(info->start[0]); + int flag, prot, sect, l_sect; + ulong start, now, last; + + if ((s_first < 0) || (s_first > s_last)) { + if (info->flash_id == FLASH_UNKNOWN) { + printf ("- missing\n"); + } else { + printf ("- no sectors to erase\n"); + } + return 1; + } + + if ((info->flash_id == FLASH_UNKNOWN) || + (info->flash_id > FLASH_AMD_COMP)) { + printf ("Can't erase unknown flash type %08lx - aborted\n", + info->flash_id); + return 1; + } + + prot = 0; + for (sect=s_first; sect<=s_last; ++sect) { + if (info->protect[sect]) { + prot++; + } + } + + if (prot) { + printf ("- Warning: %d protected sectors will not be erased!\n", + prot); + } else { + printf ("\n"); + } + + l_sect = -1; + + /* Disable interrupts which might cause a timeout here */ + flag = disable_interrupts(); + + addr[0xAAA] = 0xAAAAAAAA; + addr[0x555] = 0x55555555; + addr[0xAAA] = 0x80808080; + addr[0xAAA] = 0xAAAAAAAA; + addr[0x555] = 0x55555555; + + /* Start erase on unprotected sectors */ + for (sect = s_first; sect<=s_last; sect++) { + if (info->protect[sect] == 0) { /* not protected */ + addr = (vu_long *)(info->start[sect]) ; + addr[0] = 0x30303030 ; + l_sect = sect; + } + } + + /* re-enable interrupts if necessary */ + if (flag) + enable_interrupts(); + + /* wait at least 80us - let's wait 1 ms */ + udelay (1000); + + /* + * We wait for the last triggered sector + */ + if (l_sect < 0) + goto DONE; + + start = get_timer (0); + last = start; + addr = (vu_long *)(info->start[l_sect]); + while ((addr[0] & 0x80808080) != 0x80808080) { + if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) { + printf ("Timeout\n"); + return 1; + } + /* show that we're waiting */ + if ((now - last) > 1000) { /* every second */ + putc ('.'); + last = now; + } + } + +DONE: + /* reset to read mode */ + addr = (vu_long *)info->start[0]; + addr[0] = 0xF0F0F0F0; /* reset bank */ + + printf (" done\n"); + return 0; +} + +/*----------------------------------------------------------------------- + * Copy memory to flash, returns: + * 0 - OK + * 1 - write timeout + * 2 - Flash not erased + */ + +int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt) +{ + ulong cp, wp, data; + int i, l, rc; + + wp = (addr & ~3); /* get lower word aligned address */ + + /* + * handle unaligned start bytes + */ + if ((l = addr - wp) != 0) { + data = 0; + for (i=0, cp=wp; i<l; ++i, ++cp) { + data = (data << 8) | (*(uchar *)cp); + } + for (; i<4 && cnt>0; ++i) { + data = (data << 8) | *src++; + --cnt; + ++cp; + } + for (; cnt==0 && i<4; ++i, ++cp) { + data = (data << 8) | (*(uchar *)cp); + } + + if ((rc = write_word(info, wp, data)) != 0) { + return (rc); + } + wp += 4; + } + + /* + * handle word aligned part + */ + while (cnt >= 4) { + data = 0; + for (i=0; i<4; ++i) { + data = (data << 8) | *src++; + } + if ((rc = write_word(info, wp, data)) != 0) { + return (rc); + } + wp += 4; + cnt -= 4; + } + + if (cnt == 0) { + return (0); + } + + /* + * handle unaligned tail bytes + */ + data = 0; + for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) { + data = (data << 8) | *src++; + --cnt; + } + for (; i<4; ++i, ++cp) { + data = (data << 8) | (*(uchar *)cp); + } + + return (write_word(info, wp, data)); +} + +/*----------------------------------------------------------------------- + * Write a word to Flash, returns: + * 0 - OK + * 1 - write timeout + * 2 - Flash not erased + */ +static int write_word (flash_info_t *info, ulong dest, ulong data) +{ + vu_long *addr = (vu_long *)(info->start[0]); + ulong start; + int flag; + + /* Check if Flash is (sufficiently) erased */ + if ((*((vu_long *)dest) & data) != data) { + return (2); + } + /* Disable interrupts which might cause a timeout here */ + flag = disable_interrupts(); + + addr[0xAAA] = 0xAAAAAAAA; + addr[0x555] = 0x55555555; + addr[0xAAA] = 0xA0A0A0A0; + + *((vu_long *)dest) = data; + + /* re-enable interrupts if necessary */ + if (flag) + enable_interrupts(); + + /* data polling for D7 */ + start = get_timer (0); + while ((*((vu_long *)dest) & 0x80808080) != (data & 0x80808080)) { + if (get_timer(start) > CFG_FLASH_WRITE_TOUT) { + return (1); + } + } + return (0); +} + +/*----------------------------------------------------------------------- + */ |