[PATCH 7/7] commands: Add mdio_read and mdio_write

[Andrey Smirnov <andrew.smirnov@gmail.com>]

Add commands for low-level access to MDIO bus.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 commands/Kconfig  |  28 +++++++++
 commands/Makefile |   1 +
 commands/mdio.c   | 182 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 211 insertions(+)
 create mode 100644 commands/mdio.c

diff --git a/commands/Kconfig b/commands/Kconfig
index d93b5eb..f2e39e2 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -1850,6 +1850,34 @@ config CMD_I2C
 		  -w		use word (16 bit) wide access
 		  -v		verbose
 
+config CMD_MDIO
+	bool
+	depends on PHYLIB
+	prompt "mdio_read and mdio_write"
+	help
+	  mdio_read - read from a phy device
+
+	  Usage: mdio_read [-bacrwv]
+
+	  Options:
+		  -b BUS	mdio bus number (default 0)
+		  -a ADDR	phy device address
+		  -r START	start register
+		  -c COUNT	byte count
+		  -v		verbose
+
+
+	  mdio_write - write to a phy device
+
+	  Usage: mdio_write [-barwv] WORD0 WORD1 WORD2...
+
+	  Options:
+		  -b BUS	mdio bus number (default 0)
+		  -a ADDR	mdio device address
+		  -r START	start register
+		  -v		verbose
+
+
 config CMD_LED
 	bool
 	depends on LED
diff --git a/commands/Makefile b/commands/Makefile
index 69892c4..1dfcf1a 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -63,6 +63,7 @@ obj-$(CONFIG_USB_GADGET_SERIAL)	+= usbserial.o
 obj-$(CONFIG_CMD_GPIO)		+= gpio.o
 obj-$(CONFIG_CMD_UNCOMPRESS)	+= uncompress.o
 obj-$(CONFIG_CMD_I2C)		+= i2c.o
+obj-$(CONFIG_CMD_MDIO)		+= mdio.o
 obj-$(CONFIG_CMD_SPI)		+= spi.o
 obj-$(CONFIG_CMD_UBI)		+= ubi.o
 obj-$(CONFIG_CMD_UBIFORMAT)	+= ubiformat.o
diff --git a/commands/mdio.c b/commands/mdio.c
new file mode 100644
index 0000000..274b281
--- /dev/null
+++ b/commands/mdio.c
@@ -0,0 +1,182 @@
+/*
+ * mdio.c - MDIO commands
+ *
+ * Copyright (c) 2016 Zodiac Inflight Innovations
+ * Author: Andrey Smrinov <andrew.smirnov@gmail.com>
+ *
+ * Based on the code from commands/i2c.c:
+ * Copyright (c) 2010 Eric Bénard <eric@eukrea.Com>, Eukréa Electromatique
+ *
+ * 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.
+ *
+ */
+
+#include <common.h>
+#include <command.h>
+#include <errno.h>
+#include <malloc.h>
+#include <getopt.h>
+
+#include <fs.h>
+#include <fcntl.h>
+#include <linux/stat.h>
+#include <xfuncs.h>
+#include <net.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+#include <linux/err.h>
+
+
+static int do_mdio_write(int argc, char *argv[])
+{
+	u16 *buf;
+	struct mii_bus *mdio;
+	int addr = -1, reg = -1, count = -1, verbose = 0, opt, i, bus = 0;
+
+	while ((opt = getopt(argc, argv, "a:b:r:v")) > 0) {
+		switch (opt) {
+		case 'a':
+			addr = simple_strtol(optarg, NULL, 0);
+			break;
+		case 'r':
+			reg = simple_strtol(optarg, NULL, 0);
+			break;
+		case 'b':
+			bus = simple_strtoul(optarg, NULL, 0);
+			break;
+		case 'v':
+			verbose = 1;
+			break;
+		}
+	}
+
+	count = argc - optind;
+
+	if ((addr < 0) || (addr > PHY_MAX_ADDR) ||
+	    (reg < 0)  || (reg + count > PHY_MAX_ADDR) ||
+	    (count == 0))
+		return COMMAND_ERROR_USAGE;
+
+	mdio = mdiobus_get_bus(bus);
+	if (!mdio) {
+		printf("mdio bus %d not found\n", bus);
+		return -ENODEV;
+	}
+
+	buf = xzalloc(count * sizeof(buf[0]));
+
+	for (i = 0; i < count; i++) {
+		buf[i] = (uint16_t) simple_strtol(argv[optind+i], NULL, 16);
+
+		mdiobus_write(mdio, addr, reg + i, buf[i]);
+	}
+
+	if (verbose) {
+		printf("wrote %i words starting at reg 0x%02x"
+		       " to phydev 0x%02x on bus %i\n",
+			count, reg, addr, bus);
+
+		memory_display(buf, reg, count * sizeof(buf[0]),
+			       sizeof(buf[0]), false);
+	}
+
+	free(buf);
+	return COMMAND_SUCCESS;
+}
+
+BAREBOX_CMD_HELP_START(mdio_write)
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT ("-b BUS\t", "mdio bus number (default 0)")
+BAREBOX_CMD_HELP_OPT ("-a ADDR\t", "phy device address")
+BAREBOX_CMD_HELP_OPT ("-r START", "start register")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(mdio_write)
+	.cmd		= do_mdio_write,
+	BAREBOX_CMD_DESC("write to a phy device")
+	BAREBOX_CMD_OPTS("[-bar] WORD0 WORD1 WORD2...")
+	BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
+	BAREBOX_CMD_HELP(cmd_mdio_write_help)
+BAREBOX_CMD_END
+
+static int do_mdio_read(int argc, char *argv[])
+{
+	u16 *buf;
+	struct mii_bus *mdio;
+	int i, count = -1, addr = -1, reg = -1, verbose = 0, opt, bus = 0;
+
+	while ((opt = getopt(argc, argv, "a:b:c:r:v")) > 0) {
+		switch (opt) {
+		case 'a':
+			addr = simple_strtol(optarg, NULL, 0);
+			break;
+		case 'c':
+			count = simple_strtoul(optarg, NULL, 0);
+			break;
+		case 'b':
+			bus = simple_strtoul(optarg, NULL, 0);
+			break;
+		case 'r':
+			reg = simple_strtol(optarg, NULL, 0);
+			break;
+		case 'v':
+			verbose = 1;
+			break;
+		}
+	}
+
+	if ((addr < 0) || (addr > PHY_MAX_ADDR) ||
+	    (reg < 0)  || (reg + count > PHY_MAX_ADDR) ||
+	    (count <= 0))
+		return COMMAND_ERROR_USAGE;
+
+	mdio = mdiobus_get_bus(bus);
+	if (!mdio) {
+		printf("mdio bus %d not found\n", bus);
+		return -ENODEV;
+	}
+
+	buf = xzalloc(count * sizeof(buf[0]));
+
+	for (i = 0; i < count; i++) {
+		buf[i] = mdiobus_read(mdio, addr, reg + i);
+
+		printf("%x\n", buf[i]);
+	}
+
+	if (verbose)
+		printf("read %i bytes starting at reg 0x%04x"
+		       " from phydev 0x%02x on bus %i\n",
+		       count, reg, addr, bus);
+
+	memory_display(buf, reg, count * sizeof(buf[0]),
+		       sizeof(buf[0]), false);
+	free(buf);
+	return COMMAND_SUCCESS;
+}
+
+BAREBOX_CMD_HELP_START(mdio_read)
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT("-b BUS\t", "mdio bus number (default 0)")
+BAREBOX_CMD_HELP_OPT("-a ADDR\t", "phy device address")
+BAREBOX_CMD_HELP_OPT("-r START", "start register")
+BAREBOX_CMD_HELP_OPT("-c COUNT", "byte count")
+BAREBOX_CMD_HELP_OPT("-v\t",       "verbose")
+BAREBOX_CMD_HELP_END
+
+
+BAREBOX_CMD_START(mdio_read)
+	.cmd		= do_mdio_read,
+	BAREBOX_CMD_DESC("read from a phy device")
+	BAREBOX_CMD_OPTS("[-bacrwv]")
+	BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
+	BAREBOX_CMD_HELP(cmd_mdio_read_help)
+BAREBOX_CMD_END
-- 
2.5.0


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