524 lines
14 KiB
C
524 lines
14 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, 2001
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2001
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* Advent Networks, Inc. <http://www.adventnetworks.com>
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* Oliver Brown <oliverb@alumni.utexas.net>
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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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/*********************************************************************/
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/* DESCRIPTION:
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* This file contains the flash routines for the GW8260 board.
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*
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*
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*
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* MODULE DEPENDENCY:
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* None
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*
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*
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* RESTRICTIONS/LIMITATIONS:
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*
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* Only supports the following flash devices:
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* AMD 29F080B
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* AMD 29F016D
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*
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* Copyright (c) 2001, Advent Networks, Inc.
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*
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*/
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/*********************************************************************/
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#include <common.h>
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#include <mpc8260.h>
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flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
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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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/* functions */
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/*********************************************************************/
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/*********************************************************************/
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/* NAME: flash_init() - initializes flash banks */
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/* */
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/* DESCRIPTION: */
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/* This function initializes the flash bank(s). */
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/* */
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/* RETURNS: */
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/* The size in bytes of the flash */
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/* */
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/* RESTRICTIONS/LIMITATIONS: */
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/* */
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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<CFG_MAX_FLASH_BANKS; ++i) {
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flash_info[i].flash_id = FLASH_UNKNOWN;
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}
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/* for now, only support the 4 MB Flash SIMM */
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size = flash_get_size((vu_long *)CFG_FLASH0_BASE, &flash_info[0]);
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/*
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* protect monitor and environment sectors
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*/
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#if CFG_MONITOR_BASE >= CFG_FLASH0_BASE
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flash_protect(FLAG_PROTECT_SET,
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CFG_MONITOR_BASE,
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CFG_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(CFG_ENV_ADDR)
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# ifndef CFG_ENV_SIZE
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# define CFG_ENV_SIZE CFG_ENV_SECT_SIZE
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# endif
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flash_protect(FLAG_PROTECT_SET,
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CFG_ENV_ADDR,
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CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
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&flash_info[0]);
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#endif
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return (CFG_FLASH0_SIZE * 1024 * 1024); /*size*/
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}
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/*********************************************************************/
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/* NAME: flash_print_info() - prints flash imformation */
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/* */
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/* DESCRIPTION: */
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/* This function prints the flash information. */
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/* */
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/* INPUTS: */
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/* flash_info_t *info - flash information structure */
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/* */
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/* OUTPUTS: */
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/* Displays flash information to console */
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/* */
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/* RETURNS: */
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/* None */
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/* */
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/* RESTRICTIONS/LIMITATIONS: */
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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) & 0xff) {
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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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/*********************************************************************/
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/* NAME: flash_get_size() - detects the flash size */
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/* */
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/* DESCRIPTION: */
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/* 1) Reads vendor ID and devices ID from the flash devices. */
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/* 2) Initializes flash info struct. */
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/* 3) Return the flash size */
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/* */
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/* INPUTS: */
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/* vu_long *addr - pointer to start of flash */
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/* flash_info_t *info - flash information structure */
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/* */
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/* OUTPUTS: */
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/* None */
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/* */
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/* RETURNS: */
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/* Size of the flash in bytes, or 0 if device id is unknown. */
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/* */
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/* RESTRICTIONS/LIMITATIONS: */
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/* Only supports the following devices: */
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/* AM29F080D */
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/* AM29F016D */
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/* */
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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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vu_long vendor, devid;
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ulong base = (ulong)addr;
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/*printf("addr = %08lx\n", (unsigned long)addr); */
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/* Reset and Write auto select command: read Manufacturer ID */
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addr[0x0000] = 0xf0f0f0f0;
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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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udelay (1000);
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vendor = addr[0];
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/*printf("vendor = %08lx\n", vendor); */
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if (vendor != 0x01010101) {
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info->size = 0;
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goto out;
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}
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devid = addr[1];
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/*printf("devid = %08lx\n", devid); */
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if ((devid & 0xff) == AMD_ID_F080B) {
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info->flash_id = (vendor & 0xff) << 16 | AMD_ID_F080B;
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/* we have 16 sectors with 64KB each x 4 */
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info->sector_count = 16;
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info->size = 4 * info->sector_count * 64*1024;
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} else if ((devid & 0xff) == AMD_ID_F016D){
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info->flash_id = (vendor & 0xff) << 16 | AMD_ID_F016D;
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/* we have 32 sectors with 64KB each x 4 */
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info->sector_count = 32;
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info->size = 4 * info->sector_count * 64*1024;
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} else {
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info->size = 0;
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goto out;
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}
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/*printf("sector count = %08x\n", info->sector_count); */
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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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/* reset command */
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addr = (vu_long *)info->start[0];
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out:
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addr[0] = 0xf0f0f0f0;
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/*printf("size = %08x\n", info->size); */
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return info->size;
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}
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/*********************************************************************/
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/* NAME: flash_erase() - erases flash by sector */
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/* */
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/* DESCRIPTION: */
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/* This function erases flash sectors starting for s_first to */
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/* s_last. */
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/* */
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/* INPUTS: */
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/* flash_info_t *info - flash information structure */
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/* int s_first - first sector to erase */
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/* int s_last - last sector to erase */
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/* */
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/* OUTPUTS: */
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/* None */
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/* */
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/* RETURNS: */
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/* Returns 0 for success, 1 for failure. */
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/* */
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/* RESTRICTIONS/LIMITATIONS: */
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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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udelay (100);
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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)) > CFG_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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/* NAME: write_buff() - writes a buffer to flash */
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/* */
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/* DESCRIPTION: */
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/* This function copies a buffer, *src, to flash. */
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/* */
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/* INPUTS: */
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/* flash_info_t *info - flash information structure */
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/* uchar *src - pointer to buffer to write to flash */
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/* ulong addr - address to start write at */
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/* ulong cnt - number of bytes to write to flash */
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/* */
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/* OUTPUTS: */
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/* None */
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/* */
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/* 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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/* RESTRICTIONS/LIMITATIONS: */
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/* */
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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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/* NAME: write_word() - writes a word to flash */
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/* */
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/* DESCRIPTION: */
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/* This writes a single word to flash. */
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/* */
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/* INPUTS: */
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/* flash_info_t *info - flash information structure */
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/* ulong dest - address to write */
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/* ulong data - data to write */
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/* */
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/* OUTPUTS: */
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/* None */
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/* */
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/* 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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/* RESTRICTIONS/LIMITATIONS: */
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/* */
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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) > CFG_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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/* End of flash.c */
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/*********************************************************************/
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