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Commit 4bdcb1dd authored by Maxime Ripard's avatar Maxime Ripard Committed by David S. Miller
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net: Add MDIO bus driver for the Allwinner EMAC 



This patch adds a separate driver for the MDIO interface of the
Allwinner ethernet controllers.

Signed-off-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Tested-by: default avatarRichard Genoud <richard.genoud@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 49220505

Documentation/devicetree/bindings/net/allwinner,sun4i-mdio.txt

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+26 −0
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* Allwinner A10 MDIO Ethernet Controller interface



Required properties:

- compatible: should be "allwinner,sun4i-mdio".

- reg: address and length of the register set for the device.



Optional properties:

- phy-supply: phandle to a regulator if the PHY needs one



Example at the SoC level:

mdio@01c0b080 {

	compatible = "allwinner,sun4i-mdio";

	reg = <0x01c0b080 0x14>;

	#address-cells = <1>;

	#size-cells = <0>;

};



And at the board level:



mdio@01c0b080 {

	phy-supply = <&reg_emac_3v3>;



	phy0: ethernet-phy@0 {

		reg = <0>;

	};

};

drivers/net/phy/Kconfig

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@@ -144,6 +144,16 @@ config MDIO_OCTEON 


	  If in doubt, say Y.



config MDIO_SUN4I

	tristate "Allwinner sun4i MDIO interface support"

	depends on ARCH_SUNXI

	select REGULATOR

	select REGULATOR_FIXED_VOLTAGE

	help

	  This driver supports the MDIO interface found in the network

	  interface units of the Allwinner SoC that have an EMAC (A10,

	  A12, A10s, etc.)



config MDIO_BUS_MUX

	tristate

	depends on OF_MDIO

drivers/net/phy/Makefile

+1 −0
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@@ -30,3 +30,4 @@ obj-$(CONFIG_AMD_PHY) += amd.o 
obj-$(CONFIG_MDIO_BUS_MUX)	+= mdio-mux.o

obj-$(CONFIG_MDIO_BUS_MUX_GPIO)	+= mdio-mux-gpio.o

obj-$(CONFIG_MDIO_BUS_MUX_MMIOREG) += mdio-mux-mmioreg.o

obj-$(CONFIG_MDIO_SUN4I)	+= mdio-sun4i.o

drivers/net/phy/mdio-sun4i.c

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/*

 * Allwinner EMAC MDIO interface driver

 *

 * Copyright 2012-2013 Stefan Roese <sr@denx.de>

 * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com>

 *

 * Based on the Linux driver provided by Allwinner:

 * Copyright (C) 1997  Sten Wang

 *

 * This file is licensed under the terms of the GNU General Public

 * License version 2. This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */



#include <linux/delay.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/of_address.h>

#include <linux/of_mdio.h>

#include <linux/phy.h>

#include <linux/platform_device.h>

#include <linux/regulator/consumer.h>



#define EMAC_MAC_MCMD_REG	(0x00)

#define EMAC_MAC_MADR_REG	(0x04)

#define EMAC_MAC_MWTD_REG	(0x08)

#define EMAC_MAC_MRDD_REG	(0x0c)

#define EMAC_MAC_MIND_REG	(0x10)

#define EMAC_MAC_SSRR_REG	(0x14)



#define MDIO_TIMEOUT		(msecs_to_jiffies(100))



struct sun4i_mdio_data {

	void __iomem		*membase;

	struct regulator	*regulator;

};



static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum)

{

	struct sun4i_mdio_data *data = bus->priv;

	unsigned long start_jiffies;

	int value;



	/* issue the phy address and reg */

	writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);

	/* pull up the phy io line */

	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);



	/* Wait read complete */

	start_jiffies = jiffies;

	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {

		if (time_after(start_jiffies,

			       start_jiffies + MDIO_TIMEOUT))

			return -ETIMEDOUT;

		msleep(1);

	}



	/* push down the phy io line */

	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);

	/* and read data */

	value = readl(data->membase + EMAC_MAC_MRDD_REG);



	return value;

}



static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum,

			    u16 value)

{

	struct sun4i_mdio_data *data = bus->priv;

	unsigned long start_jiffies;



	/* issue the phy address and reg */

	writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);

	/* pull up the phy io line */

	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);



	/* Wait read complete */

	start_jiffies = jiffies;

	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {

		if (time_after(start_jiffies,

			       start_jiffies + MDIO_TIMEOUT))

			return -ETIMEDOUT;

		msleep(1);

	}



	/* push down the phy io line */

	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);

	/* and write data */

	writel(value, data->membase + EMAC_MAC_MWTD_REG);



	return 0;

}



static int sun4i_mdio_reset(struct mii_bus *bus)

{

	return 0;

}



static int sun4i_mdio_probe(struct platform_device *pdev)

{

	struct device_node *np = pdev->dev.of_node;

	struct mii_bus *bus;

	struct sun4i_mdio_data *data;

	int ret, i;



	bus = mdiobus_alloc_size(sizeof(*data));

	if (!bus)

		return -ENOMEM;



	bus->name = "sun4i_mii_bus";

	bus->read = &sun4i_mdio_read;

	bus->write = &sun4i_mdio_write;

	bus->reset = &sun4i_mdio_reset;

	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));

	bus->parent = &pdev->dev;



	bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);

	if (!bus->irq) {

		ret = -ENOMEM;

		goto err_out_free_mdiobus;

	}



	for (i = 0; i < PHY_MAX_ADDR; i++)

		bus->irq[i] = PHY_POLL;



	data = bus->priv;

	data->membase = of_iomap(np, 0);

	if (!data->membase) {

		ret = -ENOMEM;

		goto err_out_free_mdio_irq;

	}



	data->regulator = devm_regulator_get(&pdev->dev, "phy");

	if (IS_ERR(data->regulator)) {

		if (PTR_ERR(data->regulator) == -EPROBE_DEFER)

			return -EPROBE_DEFER;



		dev_info(&pdev->dev, "no regulator found\n");

	} else {

		ret = regulator_enable(data->regulator);

		if (ret)

			goto err_out_free_mdio_irq;

	}



	ret = of_mdiobus_register(bus, np);

	if (ret < 0)

		goto err_out_disable_regulator;



	platform_set_drvdata(pdev, bus);



	return 0;



err_out_disable_regulator:

	regulator_disable(data->regulator);

err_out_free_mdio_irq:

	kfree(bus->irq);

err_out_free_mdiobus:

	mdiobus_free(bus);

	return ret;

}



static int sun4i_mdio_remove(struct platform_device *pdev)

{

	struct mii_bus *bus = platform_get_drvdata(pdev);



	mdiobus_unregister(bus);

	kfree(bus->irq);

	mdiobus_free(bus);



	return 0;

}



static const struct of_device_id sun4i_mdio_dt_ids[] = {

	{ .compatible = "allwinner,sun4i-mdio" },

	{ }

};

MODULE_DEVICE_TABLE(of, sun4i_mdio_dt_ids);



static struct platform_driver sun4i_mdio_driver = {

	.probe = sun4i_mdio_probe,

	.remove = sun4i_mdio_remove,

	.driver = {

		.name = "sun4i-mdio",

		.of_match_table = sun4i_mdio_dt_ids,

	},

};



module_platform_driver(sun4i_mdio_driver);



MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver");

MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");

MODULE_LICENSE("GPL");