net: OpenFirmware GPIO based MDIO bitbang driver (a5edeccb) · Commits · e / devices / android_kernel_teracube_2e

Documentation/powerpc/booting-without-of.txt

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Original line number	Diff line number	Diff line
		@@ -58,6 +58,7 @@ Table of Contents
		o) Xilinx IP cores
		p) Freescale Synchronous Serial Interface
		q) USB EHCI controllers
		r) MDIO on GPIOs

		VII - Marvell Discovery mv64[345]6x System Controller chips
		1) The /system-controller node
		@@ -2870,6 +2871,26 @@ platforms are moved over to use the flattened-device-tree model.
		reg = <0xe8000000 32>;
		};

		r) MDIO on GPIOs

		Currently defined compatibles:
		- virtual,gpio-mdio

		MDC and MDIO lines connected to GPIO controllers are listed in the
		gpios property as described in section VIII.1 in the following order:

		MDC, MDIO.

		Example:

		mdio {
		compatible = "virtual,mdio-gpio";
		#address-cells = <1>;
		#size-cells = <0>;
		gpios = <&qe_pio_a 11
		&qe_pio_c 6>;
		};

		VII - Marvell Discovery mv64[345]6x System Controller chips
		===========================================================

drivers/net/phy/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -84,4 +84,10 @@ config MDIO_BITBANG

		If in doubt, say N.

		config MDIO_OF_GPIO
		tristate "Support for GPIO lib-based bitbanged MDIO buses"
		depends on MDIO_BITBANG && OF_GPIO
		---help---
		Supports GPIO lib-based MDIO busses.

		endif # PHYLIB

drivers/net/phy/Makefile

+1 −0

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		@@ -15,3 +15,4 @@ obj-$(CONFIG_ICPLUS_PHY) += icplus.o
		obj-$(CONFIG_REALTEK_PHY) += realtek.o
		obj-$(CONFIG_FIXED_PHY) += fixed.o
		obj-$(CONFIG_MDIO_BITBANG) += mdio-bitbang.o
		obj-$(CONFIG_MDIO_OF_GPIO) += mdio-ofgpio.o

drivers/net/phy/mdio-ofgpio.c

0 → 100644

+205 −0

Original line number	Diff line number	Diff line
		/*
		* OpenFirmware GPIO based MDIO bitbang driver.
		*
		* Copyright (c) 2008 CSE Semaphore Belgium.
		* by Laurent Pinchart <laurentp@cse-semaphore.com>
		*
		* Based on earlier work by
		*
		* Copyright (c) 2003 Intracom S.A.
		* by Pantelis Antoniou <panto@intracom.gr>
		*
		* 2005 (c) MontaVista Software, Inc.
		* Vitaly Bordug <vbordug@ru.mvista.com>
		*
		* 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/module.h>
		#include <linux/slab.h>
		#include <linux/init.h>
		#include <linux/interrupt.h>
		#include <linux/mdio-bitbang.h>
		#include <linux/of_gpio.h>
		#include <linux/of_platform.h>

		struct mdio_gpio_info {
		struct mdiobb_ctrl ctrl;
		int mdc, mdio;
		};

		static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
		{
		struct mdio_gpio_info *bitbang =
		container_of(ctrl, struct mdio_gpio_info, ctrl);

		if (dir)
		gpio_direction_output(bitbang->mdio, 1);
		else
		gpio_direction_input(bitbang->mdio);
		}

		static int mdio_read(struct mdiobb_ctrl *ctrl)
		{
		struct mdio_gpio_info *bitbang =
		container_of(ctrl, struct mdio_gpio_info, ctrl);

		return gpio_get_value(bitbang->mdio);
		}

		static void mdio(struct mdiobb_ctrl *ctrl, int what)
		{
		struct mdio_gpio_info *bitbang =
		container_of(ctrl, struct mdio_gpio_info, ctrl);

		gpio_set_value(bitbang->mdio, what);
		}

		static void mdc(struct mdiobb_ctrl *ctrl, int what)
		{
		struct mdio_gpio_info *bitbang =
		container_of(ctrl, struct mdio_gpio_info, ctrl);

		gpio_set_value(bitbang->mdc, what);
		}

		static struct mdiobb_ops mdio_gpio_ops = {
		.owner = THIS_MODULE,
		.set_mdc = mdc,
		.set_mdio_dir = mdio_dir,
		.set_mdio_data = mdio,
		.get_mdio_data = mdio_read,
		};

		static int __devinit mdio_ofgpio_bitbang_init(struct mii_bus *bus,
		struct device_node *np)
		{
		struct mdio_gpio_info *bitbang = bus->priv;

		bitbang->mdc = of_get_gpio(np, 0);
		bitbang->mdio = of_get_gpio(np, 1);

		if (bitbang->mdc < 0 \|\| bitbang->mdio < 0)
		return -ENODEV;

		snprintf(bus->id, MII_BUS_ID_SIZE, "%x", bitbang->mdc);
		return 0;
		}

		static void __devinit add_phy(struct mii_bus bus, struct device_node np)
		{
		const u32 *data;
		int len, id, irq;

		data = of_get_property(np, "reg", &len);
		if (!data \|\| len != 4)
		return;

		id = *data;
		bus->phy_mask &= ~(1 << id);

		irq = of_irq_to_resource(np, 0, NULL);
		if (irq != NO_IRQ)
		bus->irq[id] = irq;
		}

		static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
		const struct of_device_id *match)
		{
		struct device_node *np = NULL;
		struct mii_bus *new_bus;
		struct mdio_gpio_info *bitbang;
		int ret = -ENOMEM;
		int i;

		bitbang = kzalloc(sizeof(struct mdio_gpio_info), GFP_KERNEL);
		if (!bitbang)
		goto out;

		bitbang->ctrl.ops = &mdio_gpio_ops;

		new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
		if (!new_bus)
		goto out_free_priv;

		new_bus->name = "GPIO Bitbanged MII",

		ret = mdio_ofgpio_bitbang_init(new_bus, ofdev->node);
		if (ret)
		goto out_free_bus;

		new_bus->phy_mask = ~0;
		new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
		if (!new_bus->irq)
		goto out_free_bus;

		for (i = 0; i < PHY_MAX_ADDR; i++)
		new_bus->irq[i] = -1;

		while ((np = of_get_next_child(ofdev->node, np)))
		if (!strcmp(np->type, "ethernet-phy"))
		add_phy(new_bus, np);

		new_bus->dev = &ofdev->dev;
		dev_set_drvdata(&ofdev->dev, new_bus);

		ret = mdiobus_register(new_bus);
		if (ret)
		goto out_free_irqs;

		return 0;

		out_free_irqs:
		dev_set_drvdata(&ofdev->dev, NULL);
		kfree(new_bus->irq);
		out_free_bus:
		kfree(new_bus);
		out_free_priv:
		free_mdio_bitbang(new_bus);
		out:
		return ret;
		}

		static int mdio_ofgpio_remove(struct of_device *ofdev)
		{
		struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
		struct mdio_gpio_info *bitbang = bus->priv;

		mdiobus_unregister(bus);
		free_mdio_bitbang(bus);
		dev_set_drvdata(&ofdev->dev, NULL);
		kfree(bus->irq);
		kfree(bitbang);
		kfree(bus);

		return 0;
		}

		static struct of_device_id mdio_ofgpio_match[] = {
		{
		.compatible = "virtual,mdio-gpio",
		},
		{},
		};

		static struct of_platform_driver mdio_ofgpio_driver = {
		.name = "mdio-gpio",
		.match_table = mdio_ofgpio_match,
		.probe = mdio_ofgpio_probe,
		.remove = mdio_ofgpio_remove,
		};

		static int mdio_ofgpio_init(void)
		{
		return of_register_platform_driver(&mdio_ofgpio_driver);
		}

		static void mdio_ofgpio_exit(void)
		{
		of_unregister_platform_driver(&mdio_ofgpio_driver);
		}

		module_init(mdio_ofgpio_init);
		module_exit(mdio_ofgpio_exit);