mirror of
https://github.com/AsahiLinux/u-boot
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372 lines
9 KiB
C
372 lines
9 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 STM29W320DB/STM29W800D flash chips
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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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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_char *addr, flash_info_t *info);
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static int write_byte (flash_info_t *info, ulong dest, uchar 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;
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int i;
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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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/*
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* We use the following trick here: since flash is cyclically
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* mapped in the 0xFF800000-0xFFFFFFFF area, we detect the type
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* and the size of flash using 0xFF800000 as the base address,
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* and then call flash_get_size() again to fill flash_info.
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*/
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size = flash_get_size((vu_char *)CONFIG_SYS_FLASH_PRELIMBASE, &flash_info[0]);
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if (size)
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{
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flash_get_size((vu_char *)(-size), &flash_info[0]);
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}
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#if (CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_PRELIMBASE)
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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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#if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
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# ifndef CONFIG_ENV_SIZE
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# define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
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# endif
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flash_protect(FLAG_PROTECT_SET,
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CONFIG_ENV_ADDR,
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CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
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&flash_info[0]);
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#endif
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return (size);
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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 & FLASH_VENDMASK) {
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case FLASH_MAN_STM:
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printf ("ST ");
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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 FLASH_STM320DB:
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printf ("M29W320DB (32 Mbit)\n");
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break;
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case FLASH_STM800DB:
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printf ("M29W800DB (8 Mbit, bottom boot block)\n");
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break;
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case FLASH_STM800DT:
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printf ("M29W800DT (8 Mbit, top boot block)\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 KB in %d Sectors\n",
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info->size >> 10, 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_char *addr, flash_info_t *info)
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{
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short i;
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uchar 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[0x0AAA] = 0xAA;
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addr[0x0555] = 0x55;
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addr[0x0AAA] = 0x90;
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udelay(1000);
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vendor = addr[0];
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devid = addr[2];
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/* only support STM */
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if ((vendor << 16) != FLASH_MAN_STM) {
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return 0;
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}
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if (devid == FLASH_STM320DB) {
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/* MPC8240 can address maximum 2Mb of flash, that is why the MSB
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* lead is grounded and we can access only 2 first Mb */
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info->flash_id = vendor << 16 | devid;
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info->sector_count = 32;
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info->size = info->sector_count * 0x10000;
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for (i = 0; i < info->sector_count; i++) {
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info->start[i] = base + i * 0x10000;
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}
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}
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else if (devid == FLASH_STM800DB) {
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info->flash_id = vendor << 16 | devid;
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info->sector_count = 19;
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info->size = 0x100000;
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info->start[0] = 0x0000;
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info->start[1] = 0x4000;
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info->start[2] = 0x6000;
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info->start[3] = 0x8000;
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for (i = 4; i < info->sector_count; i++) {
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info->start[i] = base + (i-3) * 0x10000;
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}
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}
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else if (devid == FLASH_STM800DT) {
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info->flash_id = vendor << 16 | devid;
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info->sector_count = 19;
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info->size = 0x100000;
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for (i = 0; i < info->sector_count-4; i++) {
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info->start[i] = base + i * 0x10000;
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}
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info->start[i] = base + i * 0x10000;
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info->start[i+1] = base + i * 0x10000 + 0x8000;
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info->start[i+2] = base + i * 0x10000 + 0xa000;
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info->start[i+3] = base + i * 0x10000 + 0xc000;
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}
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else {
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return 0;
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}
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/* mark all sectors as unprotected */
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for (i = 0; i < info->sector_count; i++) {
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info->protect[i] = 0;
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}
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/* Issue the reset command */
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if (info->flash_id != FLASH_UNKNOWN) {
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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_char *addr = (vu_char *)(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[0x0AAA] = 0xAA;
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addr[0x0555] = 0x55;
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addr[0x0AAA] = 0x80;
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addr[0x0AAA] = 0xAA;
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addr[0x0555] = 0x55;
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/* wait at least 80us - let's wait 1 ms */
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udelay (1000);
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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_char *)(info->start[sect]);
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addr[0] = 0x30;
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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_char *)(info->start[l_sect]);
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while ((addr[0] & 0x80) != 0x80) {
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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 char *)info->start[0];
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addr[0] = 0xF0; /* 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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int rc;
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while (cnt > 0) {
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if ((rc = write_byte(info, addr, *src)) != 0) {
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return (rc);
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}
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addr++;
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src++;
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cnt--;
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}
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return (0);
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}
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/*-----------------------------------------------------------------------
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* Write a byte 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_byte (flash_info_t *info, ulong dest, uchar data)
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{
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vu_char *addr = (vu_char *)(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_char *)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[0x0AAA] = 0xAA;
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addr[0x0555] = 0x55;
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addr[0x0AAA] = 0xA0;
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*((vu_char *)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_char *)dest) & 0x80) != (data & 0x80)) {
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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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