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/*
* 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"
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++) {
if ((i & 0xfff) == 0xfff)
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);
if ((i & 0xfff) == 0xfff)
printf("\b\b\b\b\b\b\b\b\b\b");
}
return 0;
}
int probe_29f040b(struct flashchip *flash)
{
volatile uint8_t *bios = flash->virtual_memory;
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->virtual_memory;
*(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;
int page_size = flash->page_size;
volatile uint8_t *bios = flash->virtual_memory;
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;
}
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