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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2008 Stefan Wildemann <stefan.wildemann@kontron.com>
* Copyright (C) 2008 Claus Gindhart <claus.gindhart@kontron.com>
* Copyright (C) 2008 Dominik Geyer <dominik.geyer@kontron.com>
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <sys/mman.h>
#include <pci/pci.h>
#include "flash.h"
#include "spi.h"
typedef struct _spi_controller {
unsigned int spi_cntrl0; /* 00h */
unsigned int restrictedcmd1; /* 04h */
unsigned int restrictedcmd2; /* 08h */
unsigned int spi_cntrl1; /* 0ch */
unsigned int spi_cmdvalue0; /* 10h */
unsigned int spi_cmdvalue1; /* 14h */
unsigned int spi_cmdvalue2; /* 18h */
unsigned int spi_fakeid; /* 1Ch */
} sb600_spi_controller;
sb600_spi_controller *spi_bar = NULL;
uint8_t volatile *sb600_spibar;
int sb600_spi_read(struct flashchip *flash, uint8_t *buf)
{
int rc = 0, i;
int total_size = flash->total_size * 1024;
int page_size = 8;
for (i = 0; i < total_size / page_size; i++)
spi_nbyte_read(i * page_size, (void *)(buf + i * page_size),
page_size);
return rc;
}
uint8_t sb600_read_status_register(void)
{
const unsigned char cmd[0x02] = { JEDEC_RDSR, 0x00 };
unsigned char readarr[JEDEC_RDSR_INSIZE];
/* Read Status Register */
spi_command(sizeof(cmd), sizeof(readarr), cmd, readarr);
return readarr[0];
}
int sb600_spi_write(struct flashchip *flash, uint8_t *buf)
{
int rc = 0, i;
int total_size = flash->total_size * 1024;
/* Erase first */
printf("Erasing flash before programming... ");
flash->erase(flash);
printf("done.\n");
printf("Programming flash");
for (i = 0; i < total_size; i++, buf++) {
spi_disable_blockprotect();
spi_write_enable();
spi_byte_program(i, *buf);
/* wait program complete. */
if (i % 0x8000 == 0)
printf(".");
while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
;
}
printf(" done.\n");
return rc;
}
void reset_internal_fifo_pointer(void)
{
sb600_spibar[2] |= 0x10;
while (sb600_spibar[0xD] & 0x7)
printf("reset\n");
}
void execute_command(void)
{
sb600_spibar[2] |= 1;
while (sb600_spibar[2] & 1)
;
}
int sb600_spi_command(unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr, unsigned char *readarr)
{
int count;
/* First byte is cmd which can not being sent through FIFO. */
unsigned char cmd = *writearr++;
writecnt--;
spi_bar = (sb600_spi_controller *) sb600_spibar;
printf_debug("%s, cmd=%x, writecnt=%x, readcnt=%x\n",
__func__, cmd, writecnt, readcnt);
if (readcnt > 8) {
printf("%s, SB600 SPI controller can not receive %d bytes, "
"which is limited with 8 bytes\n", __func__, readcnt);
return 1;
}
if (writecnt > 8) {
printf("%s, SB600 SPI controller can not sent %d bytes, "
"which is limited with 8 bytes\n", __func__, writecnt);
return 1;
}
sb600_spibar[0] = cmd;
sb600_spibar[1] = readcnt << 4 | (writecnt);
/* Before we use the FIFO, reset it first. */
reset_internal_fifo_pointer();
/* Send the write byte to FIFO. */
for (count = 0; count < writecnt; count++, writearr++) {
printf_debug(" [%x]", *writearr);
sb600_spibar[0xC] = *writearr;
}
printf_debug("\n");
/*
* We should send the data by sequence, which means we need to reset
* the FIFO pointer to the first byte we want to send.
*/
reset_internal_fifo_pointer();
execute_command();
/*
* After the command executed, we should find out the index of the
* received byte. Here we just reset the FIFO pointer, skip the
* writecnt, is there anyone who have anther method to replace it?
*/
reset_internal_fifo_pointer();
for (count = 0; count < writecnt; count++) {
cmd = sb600_spibar[0xC]; /* Skip the byte we send. */
printf_debug("[ %2x]", cmd);
}
printf_debug("The FIFO pointer 6 is %d.\n", sb600_spibar[0xd] & 0x07);
for (count = 0; count < readcnt; count++, readarr++) {
*readarr = sb600_spibar[0xC];
printf_debug("[%02x]", *readarr);
}
printf_debug("\n");
return 0;
}
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