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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2009, 2010 Carl-Daniel Hailfinger
*
* 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; version 2 of the License.
*
* 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 <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "flash.h"
#include "chipdrivers.h"
#include "spi.h"
/* Length of half a clock period in usecs */
int bitbang_spi_half_period = 0;
enum bitbang_spi_master bitbang_spi_master = BITBANG_SPI_INVALID;
const struct bitbang_spi_master_entry bitbang_spi_master_table[] = {
{}, /* This entry corresponds to BITBANG_SPI_INVALID. */
};
const int bitbang_spi_master_count = ARRAY_SIZE(bitbang_spi_master_table);
void bitbang_spi_set_cs(int val)
{
bitbang_spi_master_table[bitbang_spi_master].set_cs(val);
}
void bitbang_spi_set_sck(int val)
{
bitbang_spi_master_table[bitbang_spi_master].set_sck(val);
}
void bitbang_spi_set_mosi(int val)
{
bitbang_spi_master_table[bitbang_spi_master].set_mosi(val);
}
int bitbang_spi_get_miso(void)
{
return bitbang_spi_master_table[bitbang_spi_master].get_miso();
}
int bitbang_spi_init(void)
{
bitbang_spi_set_cs(1);
bitbang_spi_set_sck(0);
buses_supported = CHIP_BUSTYPE_SPI;
return 0;
}
uint8_t bitbang_spi_readwrite_byte(uint8_t val)
{
uint8_t ret = 0;
int i;
for (i = 7; i >= 0; i--) {
bitbang_spi_set_mosi((val >> i) & 1);
programmer_delay(bitbang_spi_half_period);
bitbang_spi_set_sck(1);
ret <<= 1;
ret |= bitbang_spi_get_miso();
programmer_delay(bitbang_spi_half_period);
bitbang_spi_set_sck(0);
}
return ret;
}
int bitbang_spi_send_command(unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr, unsigned char *readarr)
{
static unsigned char *bufout = NULL;
static unsigned char *bufin = NULL;
static int oldbufsize = 0;
int bufsize;
int i;
/* Arbitrary size limitation here. We're only constrained by memory. */
if (writecnt > 65536 || readcnt > 65536)
return SPI_INVALID_LENGTH;
bufsize = max(writecnt + readcnt, 260);
/* Never shrink. realloc() calls are expensive. */
if (bufsize > oldbufsize) {
bufout = realloc(bufout, bufsize);
if (!bufout) {
msg_perr("Out of memory!\n");
if (bufin)
free(bufin);
exit(1);
}
bufin = realloc(bufout, bufsize);
if (!bufin) {
msg_perr("Out of memory!\n");
if (bufout)
free(bufout);
exit(1);
}
oldbufsize = bufsize;
}
memcpy(bufout, writearr, writecnt);
/* Shift out 0x00 while reading data. */
memset(bufout + writecnt, 0x00, readcnt);
/* Make sure any non-read data is 0xff. */
memset(bufin + writecnt, 0xff, readcnt);
bitbang_spi_set_cs(0);
for (i = 0; i < readcnt + writecnt; i++) {
bufin[i] = bitbang_spi_readwrite_byte(bufout[i]);
}
programmer_delay(bitbang_spi_half_period);
bitbang_spi_set_cs(1);
programmer_delay(bitbang_spi_half_period);
memcpy(readarr, bufin + writecnt, readcnt);
return 0;
}
int bitbang_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len)
{
/* Maximum read length is unlimited, use 64k bytes. */
return spi_read_chunked(flash, buf, start, len, 64 * 1024);
}
int bitbang_spi_write_256(struct flashchip *flash, uint8_t *buf)
{
int total_size = 1024 * flash->total_size;
msg_pdbg("total_size is %d\n", total_size);
return spi_write_chunked(flash, buf, 0, total_size, 256);
}
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