/*
 * w49f002u.c: driver for Winbond 49F002U flash models
 *
 *
 * Copyright 2000 Silicon Integrated System Corporation
 *
 *	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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * Reference:
 *	W49F002U data sheet
 *
 * $Id$
 */

#include <stdio.h>
#include "flash.h"
#include "jedec.h"
#include "w49f002u.h"

int probe_49f002 (struct flashchip * flash)
{
	volatile char * bios = flash->virt_addr;
	unsigned char id1, id2;

	*(volatile char *) (bios + 0x5555) = 0xAA;
	*(volatile char *) (bios + 0x2AAA) = 0x55;
	*(volatile char *) (bios + 0x5555) = 0x90;
    
	id1 = *(volatile unsigned char *) bios;
	id2 = *(volatile unsigned char *) (bios + 0x01);

	*(volatile char *) (bios + 0x5555) = 0xAA;
        *(volatile char *) (bios + 0x2AAA) = 0x55;
	*(volatile char *) (bios + 0x5555) = 0xF0;

	myusec_delay(10);

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

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

	return 0;
}

int erase_49f002 (struct flashchip * flash)
{
	volatile char * bios = flash->virt_addr;

	*(bios + 0x5555) = 0xAA;
	*(bios + 0x2AAA) = 0x55;
	*(bios + 0x5555) = 0x80;
	*(bios + 0x5555) = 0xAA;
	*(bios + 0x2AAA) = 0x55;
	*(bios + 0x5555) = 0x10;

	myusec_delay(100);
	toggle_ready_jedec(bios);

	return(0);
}

int write_49f002 (struct flashchip * flash, unsigned char * buf)
{
	int i;
	int total_size = flash->total_size * 1024;
	volatile char * bios = flash->virt_addr;
	volatile char * dst = bios;

	myusec_delay(10);
	erase_49f002(flash);

	printf ("Programming Page: ");
	for (i = 0; i < total_size; i++) {
		/* write to the sector */
		if ((i & 0xfff) == 0)
			printf ("address: 0x%08lx", (unsigned long)i);
		*(bios + 0x5555) = 0xAA;
		*(bios + 0x2AAA) = 0x55;
		*(bios + 0x5555) = 0xA0;
		*dst++ = *buf++;

		/* wait for Toggle bit ready */
		toggle_ready_jedec(dst);

		if ((i & 0xfff) == 0)
			printf ("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
	}
	printf("\n");

	return(0);
}