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409 lines
9.4 KiB
C
409 lines
9.4 KiB
C
/*
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* (C) Copyright 2000
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* Marius Groeger <mgroeger@sysgo.de>
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Flash Routines for AM290[48]0B devices
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*
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*--------------------------------------------------------------------
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <mpc8xx.h>
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#include "vpd.h"
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flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
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/*-----------------------------------------------------------------------
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* Functions
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*/
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static ulong flash_get_size (vu_long *addr, flash_info_t *info);
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static int write_word (flash_info_t *info, ulong dest, ulong data);
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/*-----------------------------------------------------------------------
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*/
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unsigned long flash_init (void)
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{
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unsigned long size, totsize;
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int i;
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ulong addr;
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/* Init: no FLASHes known */
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for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
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flash_info[i].flash_id = FLASH_UNKNOWN;
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}
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totsize = 0;
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addr = 0xfc000000;
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for(i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
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size = flash_get_size((vu_long *)addr, &flash_info[i]);
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if (flash_info[i].flash_id == FLASH_UNKNOWN)
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break;
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totsize += size;
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addr += size;
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}
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addr = 0xfe000000;
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for(i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
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size = flash_get_size((vu_long *)addr, &flash_info[i]);
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if (flash_info[i].flash_id == FLASH_UNKNOWN)
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break;
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totsize += size;
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addr += size;
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}
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#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
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/* monitor protection ON by default */
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flash_protect(FLAG_PROTECT_SET,
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CONFIG_SYS_MONITOR_BASE,
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CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
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&flash_info[0]);
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#endif
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return (totsize);
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}
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/*-----------------------------------------------------------------------
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*/
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void flash_print_info (flash_info_t *info)
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{
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int i;
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if (info->flash_id == FLASH_UNKNOWN) {
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printf ("missing or unknown FLASH type\n");
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return;
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}
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switch (info->flash_id >> 16) {
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case 0x1:
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printf ("AMD ");
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break;
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default:
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printf ("Unknown Vendor ");
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break;
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}
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switch (info->flash_id & FLASH_TYPEMASK) {
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case AMD_ID_F040B:
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printf ("AM29F040B (4 Mbit)\n");
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break;
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case AMD_ID_F080B:
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printf ("AM29F080B (8 Mbit)\n");
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break;
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case AMD_ID_F016D:
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printf ("AM29F016D (16 Mbit)\n");
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break;
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default:
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printf ("Unknown Chip Type\n");
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break;
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}
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printf (" Size: %ld MB in %d Sectors\n",
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info->size >> 20, info->sector_count);
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printf (" Sector Start Addresses:");
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for (i=0; i<info->sector_count; ++i) {
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if ((i % 5) == 0)
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printf ("\n ");
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printf (" %08lX%s",
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info->start[i],
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info->protect[i] ? " (RO)" : " "
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);
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}
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printf ("\n");
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return;
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}
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/*
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* The following code cannot be run from FLASH!
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*/
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static ulong flash_get_size (vu_long *addr, flash_info_t *info)
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{
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short i;
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ulong vendor, devid;
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ulong base = (ulong)addr;
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/* Write auto select command: read Manufacturer ID */
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addr[0x0555] = 0xAAAAAAAA;
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addr[0x02AA] = 0x55555555;
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addr[0x0555] = 0x90909090;
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vendor = addr[0];
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devid = addr[1] & 0xff;
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/* only support AMD */
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if (vendor != 0x01010101) {
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return 0;
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}
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vendor &= 0xf;
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devid &= 0xff;
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if (devid == AMD_ID_F040B) {
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info->flash_id = vendor << 16 | devid;
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info->sector_count = 8;
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info->size = info->sector_count * 0x10000;
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}
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else if (devid == AMD_ID_F080B) {
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info->flash_id = vendor << 16 | devid;
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info->sector_count = 16;
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info->size = 4 * info->sector_count * 0x10000;
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}
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else if (devid == AMD_ID_F016D) {
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info->flash_id = vendor << 16 | devid;
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info->sector_count = 32;
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info->size = 4 * info->sector_count * 0x10000;
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}
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else {
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printf ("## Unknown Flash Type: %08lx\n", devid);
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return 0;
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}
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/* check for protected sectors */
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for (i = 0; i < info->sector_count; i++) {
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/* sector base address */
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info->start[i] = base + i * (info->size / info->sector_count);
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/* read sector protection at sector address, (A7 .. A0) = 0x02 */
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/* D0 = 1 if protected */
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addr = (volatile unsigned long *)(info->start[i]);
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info->protect[i] = addr[2] & 1;
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}
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/*
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* Prevent writes to uninitialized FLASH.
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*/
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if (info->flash_id != FLASH_UNKNOWN) {
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addr = (vu_long *)info->start[0];
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addr[0] = 0xF0; /* reset bank */
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}
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return (info->size);
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}
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/*-----------------------------------------------------------------------
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*/
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int flash_erase (flash_info_t *info, int s_first, int s_last)
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{
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vu_long *addr = (vu_long*)(info->start[0]);
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int flag, prot, sect, l_sect;
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ulong start, now, last;
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if ((s_first < 0) || (s_first > s_last)) {
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if (info->flash_id == FLASH_UNKNOWN) {
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printf ("- missing\n");
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} else {
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printf ("- no sectors to erase\n");
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}
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return 1;
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}
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prot = 0;
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for (sect = s_first; sect <= s_last; sect++) {
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if (info->protect[sect]) {
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prot++;
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}
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}
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if (prot) {
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printf ("- Warning: %d protected sectors will not be erased!\n",
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prot);
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} else {
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printf ("\n");
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}
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l_sect = -1;
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/* Disable interrupts which might cause a timeout here */
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flag = disable_interrupts();
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addr[0x0555] = 0XAAAAAAAA;
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addr[0x02AA] = 0x55555555;
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addr[0x0555] = 0x80808080;
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addr[0x0555] = 0XAAAAAAAA;
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addr[0x02AA] = 0x55555555;
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/* Start erase on unprotected sectors */
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for (sect = s_first; sect<=s_last; sect++) {
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if (info->protect[sect] == 0) { /* not protected */
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addr = (vu_long*)(info->start[sect]);
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addr[0] = 0x30303030;
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l_sect = sect;
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}
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}
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/* re-enable interrupts if necessary */
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if (flag)
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enable_interrupts();
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/* wait at least 80us - let's wait 1 ms */
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udelay (1000);
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/*
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* We wait for the last triggered sector
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*/
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if (l_sect < 0)
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goto DONE;
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start = get_timer (0);
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last = start;
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addr = (vu_long*)(info->start[l_sect]);
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while ((addr[0] & 0x80808080) != 0x80808080) {
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if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
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printf ("Timeout\n");
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return 1;
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}
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/* show that we're waiting */
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if ((now - last) > 1000) { /* every second */
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serial_putc ('.');
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last = now;
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}
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}
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DONE:
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/* reset to read mode */
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addr = (volatile unsigned long *)info->start[0];
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addr[0] = 0xF0F0F0F0; /* reset bank */
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printf (" done\n");
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return 0;
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}
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/*-----------------------------------------------------------------------
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* Copy memory to flash, returns:
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* 0 - OK
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* 1 - write timeout
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* 2 - Flash not erased
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*/
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int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
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{
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ulong cp, wp, data;
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int i, l, rc;
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wp = (addr & ~3); /* get lower word aligned address */
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/*
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* handle unaligned start bytes
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*/
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if ((l = addr - wp) != 0) {
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data = 0;
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for (i=0, cp=wp; i<l; ++i, ++cp) {
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data = (data << 8) | (*(uchar *)cp);
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}
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for (; i<4 && cnt>0; ++i) {
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data = (data << 8) | *src++;
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--cnt;
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++cp;
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}
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for (; cnt==0 && i<4; ++i, ++cp) {
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data = (data << 8) | (*(uchar *)cp);
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}
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if ((rc = write_word(info, wp, data)) != 0) {
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return (rc);
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}
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wp += 4;
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}
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/*
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* handle word aligned part
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*/
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while (cnt >= 4) {
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data = 0;
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for (i=0; i<4; ++i) {
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data = (data << 8) | *src++;
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}
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if ((rc = write_word(info, wp, data)) != 0) {
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return (rc);
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}
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wp += 4;
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cnt -= 4;
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}
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if (cnt == 0) {
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return (0);
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}
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/*
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* handle unaligned tail bytes
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*/
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data = 0;
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for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
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data = (data << 8) | *src++;
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--cnt;
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}
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for (; i<4; ++i, ++cp) {
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data = (data << 8) | (*(uchar *)cp);
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}
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return (write_word(info, wp, data));
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}
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/*-----------------------------------------------------------------------
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* Write a word to Flash, returns:
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* 0 - OK
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* 1 - write timeout
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* 2 - Flash not erased
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*/
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static int write_word (flash_info_t *info, ulong dest, ulong data)
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{
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vu_long *addr = (vu_long*)(info->start[0]);
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ulong start;
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int flag;
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/* Check if Flash is (sufficiently) erased */
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if ((*((vu_long *)dest) & data) != data) {
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return (2);
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}
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/* Disable interrupts which might cause a timeout here */
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flag = disable_interrupts();
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addr[0x0555] = 0xAAAAAAAA;
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addr[0x02AA] = 0x55555555;
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addr[0x0555] = 0xA0A0A0A0;
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*((vu_long *)dest) = data;
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/* re-enable interrupts if necessary */
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if (flag)
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enable_interrupts();
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/* data polling for D7 */
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start = get_timer (0);
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while ((*((vu_long *)dest) & 0x80808080) != (data & 0x80808080)) {
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if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
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return (1);
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}
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}
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return (0);
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}
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/*-----------------------------------------------------------------------
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*/
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