/*
 * m29f400bt.c: driver for programming JEDEC standard flash parts
 *
 *
 * 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:
 *
 */

#include "flash.h"

void toggle_ready_m29f400bt(volatile uint8_t *dst)
{
	unsigned int i = 0;
	uint8_t tmp1, tmp2;

	tmp1 = *dst & 0x40;

	while (i++ < 0xFFFFFF) {
		tmp2 = *dst & 0x40;
		if (tmp1 == tmp2) {
			break;
		}
		tmp1 = tmp2;
	}
}

void data_polling_m29f400bt(volatile uint8_t *dst, uint8_t data)
{
	unsigned int i = 0;
	uint8_t tmp;

	data &= 0x80;

	while (i++ < 0xFFFFFF) {
		tmp = *dst & 0x80;
		if (tmp == data) {
			break;
		}
	}
}

void protect_m29f400bt(volatile uint8_t *bios)
{
	*(volatile uint8_t *)(bios + 0xAAA) = 0xAA;
	*(volatile uint8_t *)(bios + 0x555) = 0x55;
	*(volatile uint8_t *)(bios + 0xAAA) = 0xA0;

	usleep(200);
}

void write_page_m29f400bt(volatile uint8_t *bios, uint8_t *src,
			  volatile uint8_t *dst, int page_size)
{
	int i;

	for (i = 0; i < page_size; i++) {
		*(volatile uint8_t *)(bios + 0xAAA) = 0xAA;
		*(volatile uint8_t *)(bios + 0x555) = 0x55;
		*(volatile uint8_t *)(bios + 0xAAA) = 0xA0;

		/* transfer data from source to destination */
		*dst = *src;
		//*(volatile char *) (bios) = 0xF0;
		//usleep(5);
		toggle_ready_m29f400bt(dst);
		printf
		    ("Value in the flash at address %p = %#x, want %#x\n",
		     (uint8_t *) (dst - bios), *dst, *src);
		dst++;
		src++;
	}
}

int probe_m29f400bt(struct flashchip *flash)
{
	volatile uint8_t *bios = flash->virtual_memory;
	uint8_t id1, id2;

	*(volatile uint8_t *)(bios + 0xAAA) = 0xAA;
	*(volatile uint8_t *)(bios + 0x555) = 0x55;
	*(volatile uint8_t *)(bios + 0xAAA) = 0x90;

	myusec_delay(10);

	id1 = *(volatile uint8_t *)bios;
	id2 = *(volatile uint8_t *)(bios + 0x02);

	*(volatile uint8_t *)(bios + 0xAAA) = 0xAA;
	*(volatile uint8_t *)(bios + 0x555) = 0x55;
	*(volatile uint8_t *)(bios + 0xAAA) = 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_m29f400bt(struct flashchip *flash)
{
	volatile uint8_t *bios = flash->virtual_memory;

	*(volatile uint8_t *)(bios + 0xAAA) = 0xAA;
	*(volatile uint8_t *)(bios + 0x555) = 0x55;
	*(volatile uint8_t *)(bios + 0xAAA) = 0x80;

	*(volatile uint8_t *)(bios + 0xAAA) = 0xAA;
	*(volatile uint8_t *)(bios + 0x555) = 0x55;
	*(volatile uint8_t *)(bios + 0xAAA) = 0x10;

	myusec_delay(10);
	toggle_ready_m29f400bt(bios);

	return (0);
}

int block_erase_m29f400bt(volatile uint8_t *bios, volatile uint8_t *dst)
{

	*(volatile uint8_t *)(bios + 0xAAA) = 0xAA;
	*(volatile uint8_t *)(bios + 0x555) = 0x55;
	*(volatile uint8_t *)(bios + 0xAAA) = 0x80;

	*(volatile uint8_t *)(bios + 0xAAA) = 0xAA;
	*(volatile uint8_t *)(bios + 0x555) = 0x55;
	//*(volatile uint8_t *) (bios + 0xAAA) = 0x10;
	*dst = 0x30;

	myusec_delay(10);
	toggle_ready_m29f400bt(bios);

	return (0);
}

int write_m29f400bt(struct flashchip *flash, uint8_t *buf)
{
	int i;
	int total_size = flash->total_size * 1024;
	int page_size = flash->page_size;
	volatile uint8_t *bios = flash->virtual_memory;

	//erase_m29f400bt (flash);
	printf("Programming Page:\n ");
	/*********************************
	*Pages for M29F400BT:
	* 16	0x7c000		0x7ffff		TOP
	*  8 	0x7a000		0x7bfff
	*  8 	0x78000		0x79fff
	* 32	0x70000		0x77fff
	* 64	0x60000		0x6ffff
	* 64	0x50000		0x5ffff
	* 64	0x40000		0x4ffff
	*---------------------------------
	* 64	0x30000		0x3ffff
	* 64	0x20000		0x2ffff
	* 64	0x10000		0x1ffff
	* 64	0x00000		0x0ffff		BOTTOM
	*********************************/
	printf("total_size/page_size = %d\n", total_size / page_size);
	for (i = 0; i < (total_size / page_size) - 1; i++) {
		printf("%04d at address: 0x%08x\n", i, i * page_size);
		block_erase_m29f400bt(bios, bios + i * page_size);
		write_page_m29f400bt(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\b\b\b\b\b\b\b\b\b\b");
	}

	printf("%04d at address: 0x%08x\n", 7, 0x70000);
	block_erase_m29f400bt(bios, bios + 0x70000);
	write_page_m29f400bt(bios, buf + 0x70000, bios + 0x70000, 32 * 1024);

	printf("%04d at address: 0x%08x\n", 8, 0x78000);
	block_erase_m29f400bt(bios, bios + 0x78000);
	write_page_m29f400bt(bios, buf + 0x78000, bios + 0x78000, 8 * 1024);

	printf("%04d at address: 0x%08x\n", 9, 0x7a000);
	block_erase_m29f400bt(bios, bios + 0x7a000);
	write_page_m29f400bt(bios, buf + 0x7a000, bios + 0x7a000, 8 * 1024);

	printf("%04d at address: 0x%08x\n", 10, 0x7c000);
	block_erase_m29f400bt(bios, bios + 0x7c000);
	write_page_m29f400bt(bios, buf + 0x7c000, bios + 0x7c000, 16 * 1024);

	printf("\n");
	//protect_m29f400bt (bios);

	return (0);
}

int write_linuxbios_m29f400bt(struct flashchip *flash, uint8_t *buf)
{
	volatile uint8_t *bios = flash->virtual_memory;

	printf("Programming Page:\n ");
	/*********************************
	*Pages for M29F400BT:
	* 16	0x7c000		0x7ffff		TOP
	*  8 	0x7a000		0x7bfff
	*  8 	0x78000		0x79fff
	* 32	0x70000		0x77fff
	* 64	0x60000		0x6ffff
	* 64	0x50000		0x5ffff
	* 64	0x40000		0x4ffff
	*---------------------------------
	* 64	0x30000		0x3ffff
	* 64	0x20000		0x2ffff
	* 64	0x10000		0x1ffff
	* 64	0x00000		0x0ffff		BOTTOM
	*********************************/
	printf("%04d at address: 0x%08x\n", 7, 0x00000);
	block_erase_m29f400bt(bios, bios + 0x00000);
	write_page_m29f400bt(bios, buf + 0x00000, bios + 0x00000, 64 * 1024);

	printf("%04d at address: 0x%08x\n", 7, 0x10000);
	block_erase_m29f400bt(bios, bios + 0x10000);
	write_page_m29f400bt(bios, buf + 0x10000, bios + 0x10000, 64 * 1024);

	printf("%04d at address: 0x%08x\n", 7, 0x20000);
	block_erase_m29f400bt(bios, bios + 0x20000);
	write_page_m29f400bt(bios, buf + 0x20000, bios + 0x20000, 64 * 1024);

	printf("%04d at address: 0x%08x\n", 7, 0x30000);
	block_erase_m29f400bt(bios, bios + 0x30000);
	write_page_m29f400bt(bios, buf + 0x30000, bios + 0x30000, 64 * 1024);

	printf("\n");
	//protect_m29f400bt (bios);

	return (0);
}