/*
 * am29f040.c: driver for programming AMD am29f040b 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:
 *	AMD Am29F040B data sheet
 */

#include <stdio.h>
#include <stdint.h>
#include "flash.h"
#include "jedec.h"
#include "debug.h"

static __inline__ int erase_sector_29f040b(volatile uint8_t *bios,
					   unsigned long address)
{
	*(bios + 0x555) = 0xAA;
	*(bios + 0x2AA) = 0x55;
	*(bios + 0x555) = 0x80;
	*(bios + 0x555) = 0xAA;
	*(bios + 0x2AA) = 0x55;
	*(bios + address) = 0x30;

	sleep(2);

	/* wait for Toggle bit ready         */
	toggle_ready_jedec(bios + address);

	return (0);
}

static __inline__ int write_sector_29f040b(volatile uint8_t *bios,
					   uint8_t *src,
					   volatile uint8_t *dst,
					   unsigned int page_size)
{
	int i;

	for (i = 0; i < page_size; i++) {
		printf("0x%08lx",
		       (unsigned long) dst - (unsigned long) bios);

		*(bios + 0x555) = 0xAA;
		*(bios + 0x2AA) = 0x55;
		*(bios + 0x555) = 0xA0;
		*dst++ = *src++;

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

		printf("\b\b\b\b\b\b\b\b\b\b");
	}

	return (0);
}

int probe_29f040b(struct flashchip *flash)
{
	volatile uint8_t *bios = flash->virt_addr;
	uint8_t id1, id2;

	*(bios + 0x555) = 0xAA;
	*(bios + 0x2AA) = 0x55;
	*(bios + 0x555) = 0x90;

	id1 = *bios;
	id2 = *(bios + 0x01);

	*bios = 0xF0;

	myusec_delay(10);

	printf_debug("%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_29f040b(struct flashchip *flash)
{
	volatile uint8_t *bios = flash->virt_addr;

	*(bios + 0x555) = 0xAA;
	*(bios + 0x2AA) = 0x55;
	*(bios + 0x555) = 0x80;
	*(bios + 0x555) = 0xAA;
	*(bios + 0x2AA) = 0x55;
	*(bios + 0x555) = 0x10;

	myusec_delay(10);
	toggle_ready_jedec(bios);

	return (0);
}

int write_29f040b(struct flashchip *flash, uint8_t *buf)
{
	int i;
	int total_size = flash->total_size * 1024, page_size =
	    flash->page_size;
	volatile uint8_t *bios = flash->virt_addr;

	printf("Programming Page: ");
	for (i = 0; i < total_size / page_size; i++) {
		/* erase the page before programming */
		erase_sector_29f040b(bios, i * page_size);

		/* write to the sector */
		printf("%04d at address: ", i);
		write_sector_29f040b(bios, buf + i * page_size,
				     bios + i * page_size, page_size);
		printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
	}
	printf("\n");

	return (0);
}