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/*
* 49lfxxxc.c: driver for SST49LFXXXC flash models.
*
*
* Copyright 2000 Silicon Integrated System Corporation
* Copyright 2005-2007 coresystems GmbH
*
* 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:
* SST49LFxxxC data sheets
*
*/
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "flash.h"
#define SECTOR_ERASE 0x30
#define BLOCK_ERASE 0x20
#define ERASE 0xD0
#define AUTO_PGRM 0x10
#define RESET 0xFF
#define READ_ID 0x90
#define READ_STATUS 0x70
#define CLEAR_STATUS 0x50
#define STATUS_BPS (1 << 1)
#define STATUS_ESS (1 << 6)
#define STATUS_WSMS (1 << 7)
static __inline__ int write_lockbits_49lfxxxc(volatile uint8_t *bios, int size,
unsigned char bits)
{
int i, left = size;
unsigned long address;
//printf("bios=0x%08lx\n", (unsigned long)bios);
for (i = 0; left > 65536; i++, left -= 65536) {
//printf("lockbits at address=0x%08lx is 0x%01x\n", (unsigned long)0xFFC00000 - size + (i * 65536) + 2, *(bios + (i * 65536) + 2) );
*(bios + (i * 65536) + 2) = bits;
}
address = i * 65536;
//printf("lockbits at address=0x%08lx is 0x%01x\n", (unsigned long)0xFFc00000 - size + address + 2, *(bios + address + 2) );
*(bios + address + 2) = bits;
address += 32768;
//printf("lockbits at address=0x%08lx is 0x%01x\n", (unsigned long)0xFFc00000 - size + address + 2, *(bios + address + 2) );
*(bios + address + 2) = bits;
address += 8192;
//printf("lockbits at address=0x%08lx is 0x%01x\n", (unsigned long)0xFFc00000 - size + address + 2, *(bios + address + 2) );
*(bios + address + 2) = bits;
address += 8192;
//printf("lockbits at address=0x%08lx is 0x%01x\n", (unsigned long)0xFFc00000 - size + address + 2, *(bios + address + 2) );
*(bios + address + 2) = bits;
return (0);
}
static __inline__ int erase_sector_49lfxxxc(volatile uint8_t *bios,
unsigned long address)
{
unsigned char status;
*bios = SECTOR_ERASE;
*(bios + address) = ERASE;
do {
status = *bios;
if (status & (STATUS_ESS | STATUS_BPS)) {
printf("sector erase FAILED at address=0x%08lx status=0x%01x\n", (unsigned long)bios + address, status);
*bios = CLEAR_STATUS;
return (-1);
}
} while (!(status & STATUS_WSMS));
return (0);
}
static __inline__ int write_sector_49lfxxxc(volatile uint8_t *bios,
uint8_t *src,
volatile uint8_t *dst,
unsigned int page_size)
{
int i;
unsigned char status;
*bios = CLEAR_STATUS;
for (i = 0; i < page_size; i++) {
/* transfer data from source to destination */
if (*src == 0xFF) {
dst++, src++;
/* If the data is 0xFF, don't program it */
continue;
}
/*issue AUTO PROGRAM command */
*bios = AUTO_PGRM;
*dst++ = *src++;
do {
status = *bios;
if (status & (STATUS_ESS | STATUS_BPS)) {
printf("sector write FAILED at address=0x%08lx status=0x%01x\n", (unsigned long)dst, status);
*bios = CLEAR_STATUS;
return (-1);
}
} while (!(status & STATUS_WSMS));
}
return (0);
}
int probe_49lfxxxc(struct flashchip *flash)
{
volatile uint8_t *bios = flash->virtual_memory;
uint8_t id1, id2;
*bios = RESET;
*bios = READ_ID;
id1 = *(volatile uint8_t *)bios;
id2 = *(volatile uint8_t *)(bios + 0x01);
*bios = RESET;
printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
if (!(id1 == flash->manufacture_id && id2 == flash->model_id))
return 0;
map_flash_registers(flash);
return 1;
}
int erase_49lfxxxc(struct flashchip *flash)
{
volatile uint8_t *bios = flash->virtual_memory;
volatile uint8_t *registers = flash->virtual_registers;
int i;
unsigned int total_size = flash->total_size * 1024;
write_lockbits_49lfxxxc(registers, total_size, 0);
for (i = 0; i < total_size; i += flash->page_size)
if (erase_sector_49lfxxxc(bios, i) != 0)
return (-1);
*bios = RESET;
return (0);
}
int write_49lfxxxc(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;
write_lockbits_49lfxxxc(flash->virtual_registers, total_size, 0);
printf("Programming Page: ");
for (i = 0; i < total_size / page_size; i++) {
/* erase the page before programming */
erase_sector_49lfxxxc(bios, i * page_size);
/* write to the sector */
printf("%04d at address: 0x%08x", i, i * page_size);
write_sector_49lfxxxc(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");
*bios = RESET;
return (0);
}
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