flash.c

AT91RM9200的完整启动代码：包括loader, boot及U-boot三部分均已编译通过！欢迎下载使用！

/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/* #define DEBUG */

#include <common.h>
#include <mpc8xx.h>
#include <environment.h>

#ifndef	CFG_ENV_ADDR
#define CFG_ENV_ADDR	(CFG_FLASH_BASE + CFG_ENV_OFFSET)
#endif

flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*/

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (vu_long *addr, flash_info_t *info);
static int write_word (flash_info_t *info, ulong dest, ulong data);

/*-----------------------------------------------------------------------
 */

unsigned long flash_init (void)
{
	volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	unsigned long size_b0, size_b1;
	int i;

	/* Init: no FLASHes known */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
	}

	/* Static FLASH Bank configuration here - FIXME XXX */

	debug ("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_PRELIM);

	size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);

	debug ("## Get flash bank 2 size @ 0x%08x\n",FLASH_BASE1_PRELIM);

	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
		printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
			size_b0, size_b0<<20);
	}

	size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);

	debug ("## Prelim. Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);

	if (size_b1 > size_b0) {
		printf ("## ERROR: "
			"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
			size_b1, size_b1<<20,
			size_b0, size_b0<<20
		);
		flash_info[0].flash_id	= FLASH_UNKNOWN;
		flash_info[1].flash_id	= FLASH_UNKNOWN;
		flash_info[0].sector_count	= -1;
		flash_info[1].sector_count	= -1;
		flash_info[0].size		= 0;
		flash_info[1].size		= 0;
		return (0);
	}

	debug  ("## Before remap: "
		"BR0: 0x%08x    OR0: 0x%08x    "
		"BR1: 0x%08x    OR1: 0x%08x\n",
		memctl->memc_br0, memctl->memc_or0,
		memctl->memc_br1, memctl->memc_or1);

	/* Remap FLASH according to real size */
	memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & OR_AM_MSK);
	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V;

	debug ("## BR0: 0x%08x    OR0: 0x%08x\n",
		memctl->memc_br0, memctl->memc_or0);

	/* Re-do sizing to get full correct info */
	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	/* monitor protection ON by default */
	debug ("Protect monitor: %08lx ... %08lx\n",
		(ulong)CFG_MONITOR_BASE,
		(ulong)CFG_MONITOR_BASE + monitor_flash_len - 1);

	flash_protect(FLAG_PROTECT_SET,
		      CFG_MONITOR_BASE,
		      CFG_MONITOR_BASE + monitor_flash_len - 1,
		      &flash_info[0]);
#endif

#ifdef	CFG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	debug ("Protect %senvironment: %08lx ... %08lx\n",
# ifdef CFG_ENV_ADDR_REDUND
		"primary   ",
# else
		"",
# endif
		(ulong)CFG_ENV_ADDR,
		(ulong)CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1);

	flash_protect(FLAG_PROTECT_SET,
		      CFG_ENV_ADDR,
		      CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
		      &flash_info[0]);
#endif

#ifdef CFG_ENV_ADDR_REDUND
	debug ("Protect redundand environment: %08lx ... %08lx\n",
		(ulong)CFG_ENV_ADDR_REDUND,
		(ulong)CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1);

	flash_protect(FLAG_PROTECT_SET,
		      CFG_ENV_ADDR_REDUND,
		      CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1,
		      &flash_info[0]);
#endif

	if (size_b1) {
		memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
		memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
				    BR_MS_GPCM | BR_V;

		debug ("## BR1: 0x%08x    OR1: 0x%08x\n",
			memctl->memc_br1, memctl->memc_or1);

		/* Re-do sizing to get full correct info */
		size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
					  &flash_info[1]);

#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
		/* monitor protection ON by default */
		flash_protect(FLAG_PROTECT_SET,
			      CFG_MONITOR_BASE,
			      CFG_MONITOR_BASE+monitor_flash_len-1,
			      &flash_info[1]);
#endif

#ifdef	CFG_ENV_IS_IN_FLASH
		/* ENV protection ON by default */
		flash_protect(FLAG_PROTECT_SET,
			      CFG_ENV_ADDR,
			      CFG_ENV_ADDR+CFG_ENV_SIZE-1,
			      &flash_info[1]);
#endif
	} else {
		memctl->memc_br1 = 0;		/* invalidate bank */

		flash_info[1].flash_id = FLASH_UNKNOWN;
		flash_info[1].sector_count = -1;
		flash_info[1].size = 0;

		debug ("## DISABLE BR1: 0x%08x    OR1: 0x%08x\n",
			memctl->memc_br1, memctl->memc_or1);
	}

	debug ("## Final Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);

	flash_info[0].size = size_b0;
	flash_info[1].size = size_b1;

	return (size_b0 + size_b1);
}

/*-----------------------------------------------------------------------
 */
void flash_print_info  (flash_info_t *info)
{
	int i;

	if (info->flash_id == FLASH_UNKNOWN) {
		printf ("missing or unknown FLASH type\n");
		return;
	}

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_AMD:	printf ("AMD ");		break;
	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
#ifdef CONFIG_TQM8xxM	/* mirror bit flash */
	case FLASH_AMLV128U:	printf ("AM29LV128ML (128Mbit, uniform sector size)\n");
				break;
# else	/* ! TQM8xxM */
	case FLASH_AM400B:	printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM400T:	printf ("AM29LV400T (4 Mbit, top boot sector)\n");
				break;
	case FLASH_AM800B:	printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM800T:	printf ("AM29LV800T (8 Mbit, top boot sector)\n");
				break;
	case FLASH_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM160T:	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
				break;
	case FLASH_AM320B:	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM320T:	printf ("AM29LV320T (32 Mbit, top boot sector)\n");
				break;
#endif	/* TQM8xxM */
	default:		printf ("Unknown Chip Type\n");
				break;
	}

	printf ("  Size: %ld MB in %d Sectors\n",
		info->size >> 20, info->sector_count);

	printf ("  Sector Start Addresses:");
	for (i=0; i<info->sector_count; ++i) {
		if ((i % 5) == 0)
			printf ("\n   ");
		printf (" %08lX%s",
			info->start[i],
			info->protect[i] ? " (RO)" : "     "
		);
	}
	printf ("\n");
	return;
}

/*-----------------------------------------------------------------------
 */


/*-----------------------------------------------------------------------
 */

/*
 * The following code cannot be run from FLASH!
 */

static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
	ulong value;
	ulong base = (ulong)addr;

	/* Write auto select command: read Manufacturer ID */
	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00900090;

	value = addr[0];

	debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);

	switch (value) {
	case AMD_MANUFACT:
		info->flash_id = FLASH_MAN_AMD;
		break;
	case FUJ_MANUFACT:
		info->flash_id = FLASH_MAN_FUJ;
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}

	value = addr[1];			/* device ID		*/

	debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);

	switch (value) {
#ifdef CONFIG_TQM8xxM	/* mirror bit flash */
	case AMD_ID_MIRROR:
		switch(addr[14]) {
		case AMD_ID_LV128U_2:
			if (addr[15] != AMD_ID_LV128U_3) {
				info->flash_id = FLASH_UNKNOWN;
			}
			else {
				info->flash_id += FLASH_AMLV128U;
				info->sector_count = 256;
				info->size = 0x02000000;
			}
			break;				/* => 32 MB		*/
		default:
			info->flash_id = FLASH_UNKNOWN;
			break;
		}
		break;
# else	/* ! TQM8xxM */
	case AMD_ID_LV400T:
		info->flash_id += FLASH_AM400T;
		info->sector_count = 11;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case AMD_ID_LV400B:
		info->flash_id += FLASH_AM400B;
		info->sector_count = 11;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case AMD_ID_LV800T:
		info->flash_id += FLASH_AM800T;
		info->sector_count = 19;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/

	case AMD_ID_LV800B:
		info->flash_id += FLASH_AM800B;
		info->sector_count = 19;