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/*
* sst39sf020.c: driver for SST28SF040C 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:
* 4 MEgabit (512K x 8) SuperFlash EEPROM, SST28SF040 data sheet
*
* $Id$
*/
#include <stdio.h>
#include "flash.h"
#include "jedec.h"
#include "sst39sf020.h"
#define AUTO_PG_ERASE1 0x20
#define AUTO_PG_ERASE2 0xD0
#define AUTO_PGRM 0x10
#define CHIP_ERASE 0x30
#define RESET 0xFF
#define READ_ID 0x90
static __inline__ void protect_39sf020 (volatile char * bios)
{
/* ask compiler not to optimize this */
volatile unsigned char tmp;
tmp = *(volatile unsigned char *) (bios + 0x1823);
tmp = *(volatile unsigned char *) (bios + 0x1820);
tmp = *(volatile unsigned char *) (bios + 0x1822);
tmp = *(volatile unsigned char *) (bios + 0x0418);
tmp = *(volatile unsigned char *) (bios + 0x041B);
tmp = *(volatile unsigned char *) (bios + 0x0419);
tmp = *(volatile unsigned char *) (bios + 0x040A);
}
static __inline__ void unprotect_39sf020 (volatile char * bios)
{
/* ask compiler not to optimize this */
volatile unsigned char tmp;
tmp = *(volatile unsigned char *) (bios + 0x1823);
tmp = *(volatile unsigned char *) (bios + 0x1820);
tmp = *(volatile unsigned char *) (bios + 0x1822);
tmp = *(volatile unsigned char *) (bios + 0x0418);
tmp = *(volatile unsigned char *) (bios + 0x041B);
tmp = *(volatile unsigned char *) (bios + 0x0419);
tmp = *(volatile unsigned char *) (bios + 0x041A);
}
static __inline__ int erase_sector_39sf020 (volatile char * bios, unsigned long address)
{
*bios = AUTO_PG_ERASE1;
*(bios + address) = AUTO_PG_ERASE2;
/* wait for Toggle bit ready */
toggle_ready_jedec(bios);
return(0);
}
static __inline__ int write_sector_39sf020(volatile char * bios,
unsigned char * src,
volatile unsigned char * dst,
unsigned int page_size)
{
int i;
volatile char *Temp;
for (i = 0; i < page_size; i++) {
if (*dst != 0xff) {
printf("FATAL: dst %p not erased (val 0x%x\n", dst, *dst);
return(-1);
}
/* transfer data from source to destination */
if (*src == 0xFF) {
dst++, src++;
/* If the data is 0xFF, don't program it */
continue;
}
Temp = (bios + 0x5555);
*Temp = 0xAA;
Temp = bios + 0x2AAA;
*Temp = 0x55;
Temp = bios + 0x5555;
*Temp = 0xA0;
*dst = *src;
toggle_ready_jedec(bios);
if (*dst != *src)
printf("BAD! dst 0x%lx val 0x%x src 0x%x\n",
(unsigned long)dst, *dst, *src);
dst++, src++;
}
return(0);
}
int probe_39sf020 (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;
*(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_39sf020 (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(50000);
return(0);
}
int write_39sf020 (struct flashchip * flash, unsigned char * buf)
{
int i;
int total_size = flash->total_size * 1024, page_size = flash->page_size;
volatile char * bios = flash->virt_addr;
// unprotect_39sf020 (bios);
erase_39sf020(flash);
printf ("Programming Page: ");
for (i = 0; i < total_size/page_size; i++) {
/* erase the page before programming */
//erase_sector_39sf020(bios, i * page_size);
/* write to the sector */
printf ("%04d at address: 0x%08x", i, i * page_size);
write_sector_39sf020(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");
fflush(stdout);
}
printf("\n");
// protect_39sf020 (bios);
return(0);
}
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