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authorJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>2012-11-05 19:30:19 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2012-11-12 08:32:16 +0100
commit055b31e92e9a9b67fc59b15094e4356f6842a4b0 (patch)
tree8f6ab47707d61a68358d24d47460862f6a367c8d /commands/spi.c
parent968d444cdd38387882fe7bccac5dd6c8c83685a3 (diff)
downloadbarebox-055b31e92e9a9b67fc59b15094e4356f6842a4b0.tar.gz
barebox-055b31e92e9a9b67fc59b15094e4356f6842a4b0.tar.xz
introduce spi command
usefull to debug spi The command allow to read/write on a spi device Usage: spi [OPTION] [data to write 0xXX] write/read spi device. -b <bus_num> spi bus number (default = 0) -r <count> to read -c <cs> chip select (default = 0) -m <mode> spi mode (default = 0) -f <hz> max_speed_hz (default = 1MHz) -w <bit> bits_per_word (default = 8) -v verbose Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/spi.c')
-rw-r--r--commands/spi.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/commands/spi.c b/commands/spi.c
new file mode 100644
index 0000000000..899bf62608
--- /dev/null
+++ b/commands/spi.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * Under GPLv2 only
+ *
+ */
+
+#include <common.h>
+#include <command.h>
+#include <errno.h>
+#include <malloc.h>
+#include <getopt.h>
+#include <spi/spi.h>
+
+static int do_spi(int argc, char *argv[])
+{
+ struct spi_device spi;
+ int bus = 0;
+ int read = 0;
+ int verbose = 0;
+ int opt, count, i, ret;
+ int byte_per_word;
+
+ u8 *tx_buf, *rx_buf;
+
+ memset(&spi, 0, sizeof(struct spi_device));
+
+ spi.max_speed_hz = 1 * 1000 * 1000;
+ spi.bits_per_word = 8;
+
+ while ((opt = getopt(argc, argv, "b:c:r:m:f:w:v")) > 0) {
+ switch (opt) {
+ case 'b':
+ bus = simple_strtol(optarg, NULL, 0);
+ break;
+ case 'r':
+ read = simple_strtol(optarg, NULL, 0);
+ break;
+ case 'c':
+ spi.chip_select = simple_strtoul(optarg, NULL, 0);
+ break;
+ case 'm':
+ spi.mode = simple_strtoul(optarg, NULL, 0);
+ break;
+ case 'f':
+ spi.max_speed_hz = simple_strtoul(optarg, NULL, 0);
+ break;
+ case 'w':
+ spi.bits_per_word = simple_strtoul(optarg, NULL, 0);
+ break;
+ case 'v':
+ verbose = 1;
+ break;
+ default:
+ return COMMAND_ERROR_USAGE;
+ }
+ }
+
+ count = argc - optind;
+
+ if ((!read && !count) || !spi.max_speed_hz || !spi.bits_per_word)
+ return COMMAND_ERROR_USAGE;
+
+
+ spi.master = spi_get_master(bus);
+ if (!spi.master) {
+ printf("spi bus %d not found\n", bus);
+ return -ENODEV;
+ }
+
+ if (spi.chip_select > spi.master->num_chipselect) {
+ printf("spi chip select (%d)> master num chipselect (%d)\n",
+ spi.chip_select, spi.master->num_chipselect);
+ return -EINVAL;
+ }
+
+ ret = spi.master->setup(&spi);
+ if (ret) {
+ printf("can not setup the master (%d)\n", ret);
+ return ret;
+ }
+
+ tx_buf = xmalloc(count);
+ rx_buf = xmalloc(count);
+
+ for (i = 0; i < count; i++)
+ tx_buf[i] = (u8) simple_strtol(argv[optind + i], NULL, 16);
+
+ ret = spi_write_then_read(&spi, tx_buf, count, rx_buf, read);
+ if (ret)
+ goto out;
+
+ byte_per_word = max(spi.bits_per_word / 8, 1);
+ if (verbose) {
+ printf("device config\n");
+ printf(" bus_num = %d\n", spi.master->bus_num);
+ printf(" max_speed_hz = %d\n", spi.max_speed_hz);
+ printf(" chip_select = %d\n", spi.chip_select);
+ printf(" mode = 0x%x\n", spi.mode);
+ printf(" bits_per_word = %d\n", spi.bits_per_word);
+ printf("\n");
+
+ printf("wrote %i bytes\n", count);
+ memory_display(tx_buf, 0, count, byte_per_word);
+
+ printf("read %i bytes\n", read);
+ }
+
+ memory_display(rx_buf, 0, read, byte_per_word);
+
+out:
+ free(rx_buf);
+ free(tx_buf);
+ return ret;
+}
+
+static const __maybe_unused char cmd_spi_help[] =
+"Usage: spi [OPTION] [data to write 0xXX]\n"
+"write/read spi device.\n"
+" -b <bus_num> spi bus number (default = 0)\n"
+" -r <count> to read\n"
+" -c <cs> chip select (default = 0)\n"
+" -m <mode> spi mode (default = 0)\n"
+" -f <hz> max_speed_hz (default = 1MHz)\n"
+" -w <bit> bits_per_word (default = 8)\n"
+" -v verbose\n";
+
+BAREBOX_CMD_START(spi)
+ .cmd = do_spi,
+ .usage = "write/read spi device",
+ BAREBOX_CMD_HELP(cmd_spi_help)
+BAREBOX_CMD_END