470 lines
10 KiB
C
470 lines
10 KiB
C
/*
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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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* 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_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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static void flash_get_offsets (ulong base, flash_info_t *info);
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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_b0, size_b1;
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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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/* Detect size */
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size_b0 = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);
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/* Setup offsets */
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flash_get_offsets (CONFIG_SYS_FLASH_BASE, &flash_info[0]);
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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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size_b1 = 0 ;
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flash_info[1].flash_id = FLASH_UNKNOWN;
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flash_info[1].sector_count = -1;
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flash_info[0].size = size_b0;
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flash_info[1].size = size_b1;
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return (size_b0 + size_b1);
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}
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/*-----------------------------------------------------------------------
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* Fix this to support variable sector sizes
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*/
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static void flash_get_offsets (ulong base, flash_info_t *info)
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{
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int i;
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/* set up sector start address table */
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if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
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/* set sector offsets for bottom boot block type */
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for (i = 0; i < info->sector_count; i++)
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info->start[i] = base + (i * 0x00010000);
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}
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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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{
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puts ("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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{
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case FLASH_MAN_AMD: printf ("AMD "); break;
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case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
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case FLASH_MAN_BM: printf ("BRIGHT MICRO "); break;
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default: printf ("Unknown Vendor "); break;
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}
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switch (info->flash_id & FLASH_TYPEMASK)
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{
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case FLASH_AM040: printf ("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
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break;
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case FLASH_AM400B: printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
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break;
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case FLASH_AM400T: printf ("AM29LV400T (4 Mbit, top boot sector)\n");
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break;
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case FLASH_AM800B: printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
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break;
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case FLASH_AM800T: printf ("AM29LV800T (8 Mbit, top boot sector)\n");
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break;
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case FLASH_AM160B: printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
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break;
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case FLASH_AM160T: printf ("AM29LV160T (16 Mbit, top boot sector)\n");
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break;
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case FLASH_AM320B: printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
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break;
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case FLASH_AM320T: printf ("AM29LV320T (32 Mbit, top boot sector)\n");
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break;
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default: printf ("Unknown Chip Type\n");
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break;
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}
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if (info->size >> 20) {
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printf (" Size: %ld MB in %d Sectors\n",
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info->size >> 20,
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info->sector_count);
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} else {
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printf (" Size: %ld KB in %d Sectors\n",
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info->size >> 10,
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info->sector_count);
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}
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puts (" Sector Start Addresses:");
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for (i=0; i<info->sector_count; ++i)
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{
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if ((i % 5) == 0)
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{
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puts ("\n ");
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}
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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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putc ('\n');
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return;
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}
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/*-----------------------------------------------------------------------
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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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volatile unsigned char *caddr;
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char value;
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caddr = (volatile unsigned char *)addr ;
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/* Write auto select command: read Manufacturer ID */
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#if 0
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printf("Base address is: %08x\n", caddr);
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#endif
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caddr[0x0555] = 0xAA;
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caddr[0x02AA] = 0x55;
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caddr[0x0555] = 0x90;
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value = caddr[0];
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#if 0
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printf("Manufact ID: %02x\n", value);
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#endif
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switch (value)
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{
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case 0x01: /*AMD_MANUFACT*/
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info->flash_id = FLASH_MAN_AMD;
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break;
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case 0x04: /*FUJ_MANUFACT*/
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info->flash_id = FLASH_MAN_FUJ;
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break;
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default:
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info->flash_id = FLASH_UNKNOWN;
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info->sector_count = 0;
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info->size = 0;
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break;
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}
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value = caddr[1]; /* device ID */
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#if 0
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printf("Device ID: %02x\n", value);
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#endif
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switch (value)
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{
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case AMD_ID_LV040B:
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info->flash_id += FLASH_AM040;
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info->sector_count = 8;
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info->size = 0x00080000;
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break; /* => 512Kb */
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default:
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info->flash_id = FLASH_UNKNOWN;
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return (0); /* => no or unknown flash */
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}
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flash_get_offsets ((ulong)addr, &flash_info[0]);
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/* check for protected sectors */
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for (i = 0; i < info->sector_count; i++)
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{
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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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caddr = (volatile unsigned char *)(info->start[i]);
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info->protect[i] = caddr[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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{
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caddr = (volatile unsigned char *)info->start[0];
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*caddr = 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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volatile unsigned char *addr = (volatile unsigned 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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if ((info->flash_id == FLASH_UNKNOWN) ||
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(info->flash_id > FLASH_AMD_COMP)) {
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printf ("Can't erase unknown flash type - aborted\n");
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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] = 0xAA;
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addr[0x02AA] = 0x55;
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addr[0x0555] = 0x80;
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addr[0x0555] = 0xAA;
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addr[0x02AA] = 0x55;
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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 = (volatile unsigned 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 = (volatile unsigned char *)(info->start[l_sect]);
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while ((addr[0] & 0xFF) != 0xFF)
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{
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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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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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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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volatile unsigned char *addr = (volatile unsigned char*)(info->start[0]),
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*cdest,*cdata;
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ulong start;
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int flag, count = 4 ;
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cdest = (volatile unsigned char *)dest ;
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cdata = (volatile unsigned char *)&data ;
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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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while(count--)
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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] = 0xAA;
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addr[0x02AA] = 0x55;
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addr[0x0555] = 0xA0;
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*cdest = *cdata;
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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 ((*cdest ^ *cdata) & 0x80)
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{
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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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cdata++ ;
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cdest++ ;
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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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