flash.c

Uboot源码,非常通用的bootloader.适用于各种平台的Linux系统引导.

/*
 * (C) Copyright 2004-2005
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * (C) Copyright 2002 Jun Gu <[e-mail]>
 * Add support for Am29F016D and dynamic switch setting.
 *
 * 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
 */

/*
 * Modified 4/5/2001
 * Wait for completion of each sector erase command issued
 * 4/5/2001
 * Chris Hallinan - DS4.COM, Inc. - [e-mail]
 */

#include <common.h>
#include <ppc4xx.h>
#include <asm/processor.h>

#undef DEBUG

#ifdef DEBUG
#define DEBUGF(x...) printf(x)
#else
#define DEBUGF(x...)
#endif				/* DEBUG */

#define     BOOT_SMALL_FLASH        0x40	/* 01000000 */
#define     FLASH_ONBD_N            2	/* 00000010 */
#define     FLASH_SRAM_SEL          1	/* 00000001 */
#define     FLASH_ONBD_N            2	/* 00000010 */
#define     FLASH_SRAM_SEL          1	/* 00000001 */

#define     BOOT_SMALL_FLASH_VAL    4
#define     FLASH_ONBD_N_VAL        2
#define     FLASH_SRAM_SEL_VAL      1

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

static unsigned long flash_addr_table[8][CFG_MAX_FLASH_BANKS] = {
	{0xFF800000, 0xFF880000, 0xFFC00000},	/* 0:000: configuraton 4 */
	{0xFF900000, 0xFF980000, 0xFFC00000},	/* 1:001: configuraton 3 */
	{0x00000000, 0x00000000, 0x00000000},	/* 2:010: configuraton 8 */
	{0x00000000, 0x00000000, 0x00000000},	/* 3:011: configuraton 7 */
	{0xFFE00000, 0xFFF00000, 0xFF800000},	/* 4:100: configuraton 2 */
	{0xFFF00000, 0xFFF80000, 0xFF800000},	/* 5:101: configuraton 1 */
	{0x00000000, 0x00000000, 0x00000000},	/* 6:110: configuraton 6 */
	{0x00000000, 0x00000000, 0x00000000}	/* 7:111: configuraton 5 */
};

/*
 * include common flash code (for amcc boards)
 */
#include "../common/flash.c"

/*-----------------------------------------------------------------------
 * 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)
{
	unsigned long total_b = 0;
	unsigned long size_b[CFG_MAX_FLASH_BANKS];
	unsigned char *fpga_base = (unsigned char *)CFG_FPGA_BASE;
	unsigned char switch_status;
	unsigned short index = 0;
	int i;

	/* read FPGA base register FPGA_REG0 */
	switch_status = *fpga_base;

	/* check the bitmap of switch status */
	if (switch_status & BOOT_SMALL_FLASH) {
		index += BOOT_SMALL_FLASH_VAL;
	}
	if (switch_status & FLASH_ONBD_N) {
		index += FLASH_ONBD_N_VAL;
	}
	if (switch_status & FLASH_SRAM_SEL) {
		index += FLASH_SRAM_SEL_VAL;
	}

	DEBUGF("\n");
	DEBUGF("FLASH: Index: %d\n", index);

	/* Init: no FLASHes known */
	for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
		flash_info[i].sector_count = -1;
		flash_info[i].size = 0;

		/* check whether the address is 0 */
		if (flash_addr_table[index][i] == 0) {
			continue;
		}

		/* call flash_get_size() to initialize sector address */
		size_b[i] =
		    flash_get_size((vu_long *) flash_addr_table[index][i],
				   &flash_info[i]);
		flash_info[i].size = size_b[i];
		if (flash_info[i].flash_id == FLASH_UNKNOWN) {
			printf
			    ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
			     i, size_b[i], size_b[i] << 20);
			flash_info[i].sector_count = -1;
			flash_info[i].size = 0;
		}

		/* Monitor protection ON by default */
		(void)flash_protect(FLAG_PROTECT_SET, CFG_MONITOR_BASE,
				    CFG_MONITOR_BASE + CFG_MONITOR_LEN - 1,
				    &flash_info[i]);
#ifdef CFG_ENV_IS_IN_FLASH
		(void)flash_protect(FLAG_PROTECT_SET, CFG_ENV_ADDR,
				    CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
				    &flash_info[i]);
		(void)flash_protect(FLAG_PROTECT_SET, CFG_ENV_ADDR_REDUND,
				    CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1,
				    &flash_info[i]);
#endif

		total_b += flash_info[i].size;
	}

	return total_b;
}