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Commit dc700583 authored by Juergen Beisert's avatar Juergen Beisert Committed by David S. Miller
Browse files

net: dsa: LAN9303: add MDIO managed mode support 



When the LAN9303 device is in MDIO manged mode, all register accesses must
be done via MDIO.

Please note: this code is compile time tested only due to the absence of such
configured hardware. It is based on a patch from Stefan Roese from 2014.

Signed-off-by: default avatarJuergen Borleis <jbe@pengutronix.de>
CC: devicetree@vger.kernel.org
CC: robh+dt@kernel.org
CC: mark.rutland@arm.com
CC: sr@denx.de
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent be4e119f

Documentation/devicetree/bindings/net/dsa/lan9303.txt

+44 −1
Original line number Diff line number Diff line
@@ -3,7 +3,10 @@ SMSC/MicroChip LAN9303 three port ethernet switch 


Required properties:



- compatible: should be "smsc,lan9303-i2c"

- compatible: should be

  - "smsc,lan9303-i2c" for I2C managed mode

    or

  - "smsc,lan9303-mdio" for mdio managed mode



Optional properties:
@@ -60,3 +63,43 @@ I2C managed mode: 
			};

		};

	};



MDIO managed mode:



	master: masterdevice@X {

		status = "okay";

		phy-handle = <&switch>;



		mdio {

			#address-cells = <1>;

			#size-cells = <0>;



			switch: switch-phy@0 {

				compatible = "smsc,lan9303-mdio";

				reg = <0>;

				reset-gpios = <&gpio7 6 GPIO_ACTIVE_LOW>;

				reset-duration = <100>;



				ports {

					#address-cells = <1>;

					#size-cells = <0>;



					port@0 {

						reg = <0>;

						label = "cpu";

						ethernet = <&master>;

					};



					port@1 { /* external port 1 */

						reg = <1>;

						label = "lan1;

					};



					port@2 { /* external port 2 */

						reg = <2>;

						label = "lan2";

					};

				};

			};

		};

	};

drivers/net/dsa/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -66,4 +66,12 @@ config NET_DSA_SMSC_LAN9303_I2C 
	  Enable access functions if the SMSC/Microchip LAN9303 is configured

	  for I2C managed mode.



config NET_DSA_SMSC_LAN9303_MDIO

	tristate "SMSC/Microchip LAN9303 3-ports 10/100 ethernet switch in MDIO managed mode"

	depends on NET_DSA

	select NET_DSA_SMSC_LAN9303

	---help---

	  Enable access functions if the SMSC/Microchip LAN9303 is configured

	  for MDIO managed mode.



endmenu

drivers/net/dsa/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ obj-$(CONFIG_NET_DSA_QCA8K) += qca8k.o 
obj-$(CONFIG_NET_DSA_MT7530)	+= mt7530.o

obj-$(CONFIG_NET_DSA_SMSC_LAN9303) += lan9303-core.o

obj-$(CONFIG_NET_DSA_SMSC_LAN9303_I2C) += lan9303_i2c.o

obj-$(CONFIG_NET_DSA_SMSC_LAN9303_MDIO) += lan9303_mdio.o

obj-y				+= b53/

obj-y				+= mv88e6xxx/

obj-$(CONFIG_NET_DSA_LOOP)	+= dsa_loop.o dsa_loop_bdinfo.o

drivers/net/dsa/lan9303_mdio.c

0 → 100644
+148 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>

 *

 * Partially based on a patch from

 * Copyright (c) 2014 Stefan Roese <sr@denx.de>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * version 2, as published by the Free Software Foundation.

 *

 * 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 <linux/kernel.h>

#include <linux/module.h>

#include <linux/mdio.h>

#include <linux/phy.h>

#include <linux/of.h>



#include "lan9303.h"



/* Generate phy-addr and -reg from the input address */

#define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f)

#define PHY_REG(x) (((x) >> 1) & 0x1f)



struct lan9303_mdio {

	struct mdio_device *device;

	struct lan9303 chip;

};



static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val)

{

	mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val);

}



static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val)

{

	struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;



	mutex_lock(&sw_dev->device->bus->mdio_lock);

	lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff);

	lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff);

	mutex_unlock(&sw_dev->device->bus->mdio_lock);



	return 0;

}



static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg)

{

	return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg));

}



static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)

{

	struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;



	mutex_lock(&sw_dev->device->bus->mdio_lock);

	*val = lan9303_mdio_real_read(sw_dev->device, reg);

	*val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16);

	mutex_unlock(&sw_dev->device->bus->mdio_lock);



	return 0;

}



static const struct regmap_config lan9303_mdio_regmap_config = {

	.reg_bits = 8,

	.val_bits = 32,

	.reg_stride = 1,

	.can_multi_write = true,

	.max_register = 0x0ff, /* address bits 0..1 are not used */

	.reg_format_endian = REGMAP_ENDIAN_LITTLE,



	.volatile_table = &lan9303_register_set,

	.wr_table = &lan9303_register_set,

	.rd_table = &lan9303_register_set,



	.reg_read = lan9303_mdio_read,

	.reg_write = lan9303_mdio_write,



	.cache_type = REGCACHE_NONE,

};



static int lan9303_mdio_probe(struct mdio_device *mdiodev)

{

	struct lan9303_mdio *sw_dev;

	int ret;



	sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio),

			      GFP_KERNEL);

	if (!sw_dev)

		return -ENOMEM;



	sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev,

						&lan9303_mdio_regmap_config);

	if (IS_ERR(sw_dev->chip.regmap)) {

		ret = PTR_ERR(sw_dev->chip.regmap);

		dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);

		return ret;

	}



	/* link forward and backward */

	sw_dev->device = mdiodev;

	dev_set_drvdata(&mdiodev->dev, sw_dev);

	sw_dev->chip.dev = &mdiodev->dev;



	ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);

	if (ret != 0)

		return ret;



	dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n");



	return 0;

}



static void lan9303_mdio_remove(struct mdio_device *mdiodev)

{

	struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);



	if (!sw_dev)

		return;



	lan9303_remove(&sw_dev->chip);

}



/*-------------------------------------------------------------------------*/



static const struct of_device_id lan9303_mdio_of_match[] = {

	{ .compatible = "smsc,lan9303-mdio" },

	{ /* sentinel */ },

};

MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);



static struct mdio_driver lan9303_mdio_driver = {

	.mdiodrv.driver = {

		.name = "LAN9303_MDIO",

		.of_match_table = of_match_ptr(lan9303_mdio_of_match),

	},

	.probe  = lan9303_mdio_probe,

	.remove = lan9303_mdio_remove,

};

mdio_module_driver(lan9303_mdio_driver);



MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>");

MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode");

MODULE_LICENSE("GPL v2");