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-rw-r--r--linux_spi.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/linux_spi.c b/linux_spi.c
new file mode 100644
index 0000000..fa6ec17
--- /dev/null
+++ b/linux_spi.c
@@ -0,0 +1,139 @@
+/*
+ * 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
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <linux/spi/spidev.h>
+#include <sys/ioctl.h>
+#include "flash.h"
+#include "chipdrivers.h"
+#include "programmer.h"
+#include "spi.h"
+
+static int fd = -1;
+
+static int linux_spi_shutdown(void *data);
+static int linux_spi_send_command(unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *txbuf, unsigned char *rxbuf);
+static int linux_spi_read(struct flashchip *flash, uint8_t *buf, int start,
+ int len);
+static int linux_spi_write_256(struct flashchip *flash, uint8_t *buf,
+ int start, int len);
+
+static const struct spi_programmer spi_programmer_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,
+};
+
+int linux_spi_init(void)
+{
+ char *p, *endp, *dev;
+ int speed = 0;
+
+ 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");
+ return 1;
+ }
+
+ p = extract_programmer_param("speed");
+ if (p && strlen(p)) {
+ speed = strtoul(p, &endp, 10) * 1024;
+ if (p == endp) {
+ msg_perr("%s: invalid clock: %s kHz\n", __func__, p);
+ return 1;
+ }
+ }
+
+ if ((fd = open(dev, O_RDWR)) == -1) {
+ msg_perr("%s: failed to open %s: %s\n", __func__,
+ dev, strerror(errno));
+ return 1;
+ }
+
+ if (speed > 0 && ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed) == -1) {
+ msg_perr("%s: failed to set speed %dHz: %s\n",
+ __func__, speed, strerror(errno));
+ close(fd);
+ return 1;
+ }
+
+ if (register_shutdown(linux_spi_shutdown, NULL))
+ return 1;
+
+ register_spi_programmer(&spi_programmer_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(unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *txbuf, unsigned char *rxbuf)
+{
+ struct spi_ioc_transfer msg[2] = {
+ {
+ .tx_buf = (uint64_t)txbuf,
+ .len = writecnt,
+ },
+ {
+ .rx_buf = (uint64_t)rxbuf,
+ .len = readcnt,
+ },
+ };
+
+ if (fd == -1)
+ return -1;
+
+ if (ioctl(fd, SPI_IOC_MESSAGE(2), msg) == -1) {
+ msg_cerr("%s: ioctl: %s\n", __func__, strerror(errno));
+ return -1;
+ }
+ return 0;
+}
+
+static int linux_spi_read(struct flashchip *flash, uint8_t *buf, int start,
+ int len)
+{
+ return spi_read_chunked(flash, buf, start, len, getpagesize());
+}
+
+static int linux_spi_write_256(struct flashchip *flash, uint8_t *buf,
+ int start, int len)
+{
+ return spi_write_chunked(flash, buf, start, len, getpagesize() - 4);
+}
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