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/*
* jedec.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:
*
* $Id$
*/
#include <stdio.h>
#include "flash.h"
#include "jedec.h"
int probe_jedec (struct flashchip * flash)
{
volatile char * bios = flash->virt_addr;
unsigned char id1, id2;
*(volatile char *) (bios + 0x5555) = 0xAA;
myusec_delay(10);
*(volatile char *) (bios + 0x2AAA) = 0x55;
myusec_delay(10);
*(volatile char *) (bios + 0x5555) = 0x90;
myusec_delay(10);
id1 = *(volatile unsigned char *) bios;
id2 = *(volatile unsigned char *) (bios + 0x01);
*(volatile char *) (bios + 0x5555) = 0xAA;
myusec_delay(10);
*(volatile char *) (bios + 0x2AAA) = 0x55;
myusec_delay(10);
*(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_sector_jedec (volatile char * bios, unsigned int page)
{
/* Chip erase function does not exist for LPC mode on 49lf040.
* Erase sector-by-sector instead. */
volatile unsigned char *Temp;
/* Issue the Sector Erase command to 40LF040 */
Temp = bios + 0x5555; /* set up address to be C000:5555h */
*Temp = 0xAA; /* write data 0xAA to the address */
myusec_delay(10);
Temp = bios + 0x2AAA; /* set up address to be C000:2AAAh */
*Temp = 0x55; /* write data 0x55 to the address */
myusec_delay(10);
Temp = bios + 0x5555; /* set up address to be C000:5555h */
*Temp = 0x80; /* write data 0x80 to the address */
myusec_delay(10);
Temp = bios + 0x5555; /* set up address to be C000:5555h */
*Temp = 0xAA; /* write data 0xAA to the address */
myusec_delay(10);
Temp = bios + 0x2AAA; /* set up address to be C000:2AAAh */
*Temp = 0x55; /* write data 0x55 to the address */
myusec_delay(10);
Temp = bios + page; /* set up address to be the current sector */
*Temp = 0x30; /* write data 0x30 to the address */
/* wait for Toggle bit ready */
toggle_ready_jedec(bios);
return(0);
}
int erase_jedec (struct flashchip * flash)
{
volatile unsigned char * bios = flash->virt_addr;
volatile unsigned char *Temp;
/* Issue the Sector Erase command to 39SF020 */
Temp = bios + 0x5555; /* set up address to be C000:5555h */
*Temp = 0xAA; /* write data 0xAA to the address */
myusec_delay(10);
Temp = bios + 0x2AAA; /* set up address to be C000:2AAAh */
*Temp = 0x55; /* write data 0x55 to the address */
myusec_delay(10);
Temp = bios + 0x5555; /* set up address to be C000:5555h */
*Temp = 0x80; /* write data 0x80 to the address */
myusec_delay(10);
Temp = bios + 0x5555; /* set up address to be C000:5555h */
*Temp = 0xAA; /* write data 0xAA to the address */
myusec_delay(10);
Temp = bios + 0x2AAA; /* set up address to be C000:2AAAh */
*Temp = 0x55; /* write data 0x55 to the address */
myusec_delay(10);
Temp = bios + 0x5555; /* set up address to be C000:5555h */
*Temp = 0x10; /* write data 0x55 to the address */
myusec_delay(10);
toggle_ready_jedec(bios);
return(0);
}
int write_jedec (struct flashchip * flash, unsigned char * buf)
{
int i;
int total_size = flash->total_size *1024, page_size = flash->page_size;
volatile unsigned char * bios = flash->virt_addr;
erase_jedec (flash);
if (*bios != (unsigned char ) 0xff) {
printf("ERASE FAILED\n");
return -1;
}
printf ("Programming Page: ");
for (i = 0; i < total_size/page_size; i++) {
printf ("%04d at address: 0x%08x", i, i * page_size);
write_page_jedec(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("\n");
protect_jedec (bios);
return(0);
}
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