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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2011 Sven Schnelle <svens@stackframe.org>
*
* 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
*/
#if CONFIG_LINUX_SPI == 1
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>
#include <linux/ioctl.h>
#include "flash.h"
#include "chipdrivers.h"
#include "programmer.h"
#include "spi.h"
/* Devices known to work with this module (FIXME: export as struct dev_entry):
* Beagle Bone Black
* Raspberry Pi
* HummingBoard
*/
static int fd = -1;
static int linux_spi_shutdown(void *data);
static int linux_spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt,
const unsigned char *txbuf,
unsigned char *rxbuf);
static int linux_spi_read(struct flashctx *flash, uint8_t *buf,
unsigned int start, unsigned int len);
static int linux_spi_write_256(struct flashctx *flash, const uint8_t *buf,
unsigned int start, unsigned int len);
static const struct spi_master spi_master_linux = {
.type = SPI_CONTROLLER_LINUX,
.max_data_read = MAX_DATA_UNSPECIFIED, /* TODO? */
.max_data_write = MAX_DATA_UNSPECIFIED, /* TODO? */
.command = linux_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = linux_spi_read,
.write_256 = linux_spi_write_256,
.write_aai = default_spi_write_aai,
};
int linux_spi_init(void)
{
char *p, *endp, *dev;
uint32_t speed_hz = 0;
/* FIXME: make the following configurable by CLI options. */
/* SPI mode 0 (beware this also includes: MSB first, CS active low and others */
const uint8_t mode = SPI_MODE_0;
const uint8_t bits = 8;
p = extract_programmer_param("spispeed");
if (p && strlen(p)) {
speed_hz = (uint32_t)strtoul(p, &endp, 10) * 1000;
if (p == endp) {
msg_perr("%s: invalid clock: %s kHz\n", __func__, p);
free(p);
return 1;
}
}
free(p);
dev = extract_programmer_param("dev");
if (!dev || !strlen(dev)) {
msg_perr("No SPI device given. Use flashrom -p "
"linux_spi:dev=/dev/spidevX.Y\n");
free(dev);
return 1;
}
msg_pdbg("Using device %s\n", dev);
if ((fd = open(dev, O_RDWR)) == -1) {
msg_perr("%s: failed to open %s: %s\n", __func__,
dev, strerror(errno));
free(dev);
return 1;
}
free(dev);
if (register_shutdown(linux_spi_shutdown, NULL))
return 1;
/* We rely on the shutdown function for cleanup from here on. */
if (speed_hz > 0) {
if (ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed_hz) == -1) {
msg_perr("%s: failed to set speed to %d Hz: %s\n",
__func__, speed_hz, strerror(errno));
return 1;
}
msg_pdbg("Using %d kHz clock\n", speed_hz/1000);
}
if (ioctl(fd, SPI_IOC_WR_MODE, &mode) == -1) {
msg_perr("%s: failed to set SPI mode to 0x%02x: %s\n",
__func__, mode, strerror(errno));
return 1;
}
if (ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits) == -1) {
msg_perr("%s: failed to set the number of bits per SPI word to %u: %s\n",
__func__, bits == 0 ? 8 : bits, strerror(errno));
return 1;
}
register_spi_master(&spi_master_linux);
return 0;
}
static int linux_spi_shutdown(void *data)
{
if (fd != -1) {
close(fd);
fd = -1;
}
return 0;
}
static int linux_spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt,
const unsigned char *txbuf,
unsigned char *rxbuf)
{
int iocontrol_code;
struct spi_ioc_transfer msg[2] = {
{
.tx_buf = (uint64_t)(uintptr_t)txbuf,
.len = writecnt,
},
{
.rx_buf = (uint64_t)(uintptr_t)rxbuf,
.len = readcnt,
},
};
if (fd == -1)
return -1;
/* The implementation currently does not support requests that
don't start with sending a command. */
if (writecnt == 0)
return SPI_INVALID_LENGTH;
/* Just submit the first (write) request in case there is nothing
to read. Otherwise submit both requests. */
if (readcnt == 0)
iocontrol_code = SPI_IOC_MESSAGE(1);
else
iocontrol_code = SPI_IOC_MESSAGE(2);
if (ioctl(fd, iocontrol_code, msg) == -1) {
msg_cerr("%s: ioctl: %s\n", __func__, strerror(errno));
return -1;
}
return 0;
}
static int linux_spi_read(struct flashctx *flash, uint8_t *buf,
unsigned int start, unsigned int len)
{
return spi_read_chunked(flash, buf, start, len,
(unsigned int)getpagesize());
}
static int linux_spi_write_256(struct flashctx *flash, const uint8_t *buf, unsigned int start, unsigned int len)
{
return spi_write_chunked(flash, buf, start, len,
((unsigned int)getpagesize()) - 4);
}
#endif // CONFIG_LINUX_SPI == 1
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