coreboot-kgpe-d16/util/flashrom/w29ee011.c

/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2007 Markus Boas <ryven@ryven.de>
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <string.h>
#include "flash.h"

int probe_w29ee011(struct flashchip *flash)
{
	volatile uint8_t *bios = flash->virtual_memory;
	uint8_t id1, id2;
	extern char *chip_to_probe;

	if (!chip_to_probe || strcmp(chip_to_probe, "W29EE011")) {
		printf_debug("\n===\n");
		printf_debug("  Probing disabled for Winbond W29EE011 because the probing sequence puts the\n");
		printf_debug("  AMIC A49LF040A in a funky state.\n");
		printf_debug("  Use 'flashrom -c W29EE011' if you have a board with this chip.");
		printf_debug("\n===\n");
		return 0;
	}

	/* Issue JEDEC Product ID Entry command */
	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x5555) = 0x80;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x5555) = 0x60;
	myusec_delay(10);

	/* Read product ID */
	id1 = *(volatile uint8_t *)bios;
	id2 = *(volatile uint8_t *)(bios + 0x01);

	/* Issue JEDEC Product ID Exit command */
	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x5555) = 0xF0;
	myusec_delay(10);

	printf_debug("%s: id1 0x%02x, id2 0x%02x\n", __FUNCTION__, id1, id2);

	if (id1 == flash->manufacture_id && id2 == flash->model_id)
		return 1;

	return 0;
}