drivers/net/phy/mdio-gpio.c - kernel/windcharger - Git at Google

 /*
  * GPIO based MDIO bitbang driver.
  * Supports OpenFirmware.
  *
  * Copyright (c) 2008 CSE Semaphore Belgium.
  *  by Laurent Pinchart <laurentp@cse-semaphore.com>
  *
  * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
  *
  * 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/platform_device.h>
 #include <linux/gpio.h>
 #include <linux/mdio-gpio.h>

 #ifdef CONFIG_OF_GPIO
 #include <linux/of_gpio.h>
 #include <linux/of_mdio.h>
 #include <linux/of_platform.h>
 #endif

 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_get(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_set(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_set(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,
 	.set_mdio_dir = mdio_dir,
 	.set_mdio_data = mdio_set,
 	.get_mdio_data = mdio_get,
 };

 static struct mii_bus * __devinit mdio_gpio_bus_init(struct device *dev,
 					struct mdio_gpio_platform_data *pdata,
 					int bus_id)
 {
 	struct mii_bus *new_bus;
 	struct mdio_gpio_info *bitbang;
 	int i;

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

 	bitbang->ctrl.ops = &mdio_gpio_ops;
 	bitbang->ctrl.reset = pdata->reset;
 	bitbang->mdc = pdata->mdc;
 	bitbang->mdio = pdata->mdio;

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

 	new_bus->name = "GPIO Bitbanged MDIO",

 	new_bus->phy_mask = pdata->phy_mask;
 	new_bus->irq = pdata->irqs;
 	new_bus->parent = dev;

 	if (new_bus->phy_mask == ~0)
 		goto out_free_bus;

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

 	snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);

 	if (gpio_request(bitbang->mdc, "mdc"))
 		goto out_free_bus;

 	if (gpio_request(bitbang->mdio, "mdio"))
 		goto out_free_mdc;

 	gpio_direction_output(bitbang->mdc, 0);

 	dev_set_drvdata(dev, new_bus);

 	return new_bus;

 out_free_mdc:
 	gpio_free(bitbang->mdc);
 out_free_bus:
 	free_mdio_bitbang(new_bus);
 out_free_bitbang:
 	kfree(bitbang);
 out:
 	return NULL;
 }

 static void mdio_gpio_bus_deinit(struct device *dev)
 {
 	struct mii_bus *bus = dev_get_drvdata(dev);
 	struct mdio_gpio_info *bitbang = bus->priv;

 	dev_set_drvdata(dev, NULL);
 	gpio_free(bitbang->mdio);
 	gpio_free(bitbang->mdc);
 	free_mdio_bitbang(bus);
 	kfree(bitbang);
 }

 static void __devexit mdio_gpio_bus_destroy(struct device *dev)
 {
 	struct mii_bus *bus = dev_get_drvdata(dev);

 	mdiobus_unregister(bus);
 	mdio_gpio_bus_deinit(dev);
 }

 static int __devinit mdio_gpio_probe(struct platform_device *pdev)
 {
 	struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data;
 	struct mii_bus *new_bus;
 	int ret;

 	if (!pdata)
 		return -ENODEV;

 	new_bus = mdio_gpio_bus_init(&pdev->dev, pdata, pdev->id);
 	if (!new_bus)
 		return -ENODEV;

 	ret = mdiobus_register(new_bus);
 	if (ret)
 		mdio_gpio_bus_deinit(&pdev->dev);

 	return ret;
 }

 static int __devexit mdio_gpio_remove(struct platform_device *pdev)
 {
 	mdio_gpio_bus_destroy(&pdev->dev);

 	return 0;
 }

 #ifdef CONFIG_OF_GPIO

 static int __devinit mdio_ofgpio_probe(struct platform_device *ofdev)
 {
 	struct mdio_gpio_platform_data *pdata;
 	struct mii_bus *new_bus;
 	int ret;

 	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;

 	ret = of_get_gpio(ofdev->dev.of_node, 0);
 	if (ret < 0)
 		goto out_free;
 	pdata->mdc = ret;

 	ret = of_get_gpio(ofdev->dev.of_node, 1);
 	if (ret < 0)
 		goto out_free;
 	pdata->mdio = ret;

 	new_bus = mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
 	if (!new_bus)
 		goto out_free;

 	ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
 	if (ret)
 		mdio_gpio_bus_deinit(&ofdev->dev);

 	return ret;

 out_free:
 	kfree(pdata);
 	return -ENODEV;
 }

 static int __devexit mdio_ofgpio_remove(struct platform_device *ofdev)
 {
 	mdio_gpio_bus_destroy(&ofdev->dev);
 	kfree(ofdev->dev.platform_data);

 	return 0;
 }

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

 static struct platform_driver mdio_ofgpio_driver = {
 	.driver = {
 		.name = "mdio-ofgpio",
 		.owner = THIS_MODULE,
 		.of_match_table = mdio_ofgpio_match,
 	},
 	.probe = mdio_ofgpio_probe,
 	.remove = __devexit_p(mdio_ofgpio_remove),
 };

 static inline int __init mdio_ofgpio_init(void)
 {
 	return platform_driver_register(&mdio_ofgpio_driver);
 }

 static inline void __exit mdio_ofgpio_exit(void)
 {
 	platform_driver_unregister(&mdio_ofgpio_driver);
 }
 #else
 static inline int __init mdio_ofgpio_init(void) { return 0; }
 static inline void __exit mdio_ofgpio_exit(void) { }
 #endif /* CONFIG_OF_GPIO */

 static struct platform_driver mdio_gpio_driver = {
 	.probe = mdio_gpio_probe,
 	.remove = __devexit_p(mdio_gpio_remove),
 	.driver		= {
 		.name	= "mdio-gpio",
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init mdio_gpio_init(void)
 {
 	int ret;

 	ret = mdio_ofgpio_init();
 	if (ret)
 		return ret;

 	ret = platform_driver_register(&mdio_gpio_driver);
 	if (ret)
 		mdio_ofgpio_exit();

 	return ret;
 }
 module_init(mdio_gpio_init);

 static void __exit mdio_gpio_exit(void)
 {
 	platform_driver_unregister(&mdio_gpio_driver);
 	mdio_ofgpio_exit();
 }
 module_exit(mdio_gpio_exit);

 MODULE_ALIAS("platform:mdio-gpio");
 MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");
	/*
	* GPIO based MDIO bitbang driver.
	* Supports OpenFirmware.
	*
	* Copyright (c) 2008 CSE Semaphore Belgium.
	* by Laurent Pinchart <laurentp@cse-semaphore.com>
	*
	* Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
	*
	* 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/platform_device.h>
	#include <linux/gpio.h>
	#include <linux/mdio-gpio.h>

	#ifdef CONFIG_OF_GPIO
	#include <linux/of_gpio.h>
	#include <linux/of_mdio.h>
	#include <linux/of_platform.h>
	#endif

	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_get(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_set(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_set(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,
	.set_mdio_dir = mdio_dir,
	.set_mdio_data = mdio_set,
	.get_mdio_data = mdio_get,
	};

	static struct mii_bus * __devinit mdio_gpio_bus_init(struct device *dev,
	struct mdio_gpio_platform_data *pdata,
	int bus_id)
	{
	struct mii_bus *new_bus;
	struct mdio_gpio_info *bitbang;
	int i;

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

	bitbang->ctrl.ops = &mdio_gpio_ops;
	bitbang->ctrl.reset = pdata->reset;
	bitbang->mdc = pdata->mdc;
	bitbang->mdio = pdata->mdio;

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

	new_bus->name = "GPIO Bitbanged MDIO",

	new_bus->phy_mask = pdata->phy_mask;
	new_bus->irq = pdata->irqs;
	new_bus->parent = dev;

	if (new_bus->phy_mask == ~0)
	goto out_free_bus;

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

	snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);

	if (gpio_request(bitbang->mdc, "mdc"))
	goto out_free_bus;

	if (gpio_request(bitbang->mdio, "mdio"))
	goto out_free_mdc;

	gpio_direction_output(bitbang->mdc, 0);

	dev_set_drvdata(dev, new_bus);

	return new_bus;

	out_free_mdc:
	gpio_free(bitbang->mdc);
	out_free_bus:
	free_mdio_bitbang(new_bus);
	out_free_bitbang:
	kfree(bitbang);
	out:
	return NULL;
	}

	static void mdio_gpio_bus_deinit(struct device *dev)
	{
	struct mii_bus *bus = dev_get_drvdata(dev);
	struct mdio_gpio_info *bitbang = bus->priv;

	dev_set_drvdata(dev, NULL);
	gpio_free(bitbang->mdio);
	gpio_free(bitbang->mdc);
	free_mdio_bitbang(bus);
	kfree(bitbang);
	}

	static void __devexit mdio_gpio_bus_destroy(struct device *dev)
	{
	struct mii_bus *bus = dev_get_drvdata(dev);

	mdiobus_unregister(bus);
	mdio_gpio_bus_deinit(dev);
	}

	static int __devinit mdio_gpio_probe(struct platform_device *pdev)
	{
	struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data;
	struct mii_bus *new_bus;
	int ret;

	if (!pdata)
	return -ENODEV;

	new_bus = mdio_gpio_bus_init(&pdev->dev, pdata, pdev->id);
	if (!new_bus)
	return -ENODEV;

	ret = mdiobus_register(new_bus);
	if (ret)
	mdio_gpio_bus_deinit(&pdev->dev);

	return ret;
	}

	static int __devexit mdio_gpio_remove(struct platform_device *pdev)
	{
	mdio_gpio_bus_destroy(&pdev->dev);

	return 0;
	}

	#ifdef CONFIG_OF_GPIO

	static int __devinit mdio_ofgpio_probe(struct platform_device *ofdev)
	{
	struct mdio_gpio_platform_data *pdata;
	struct mii_bus *new_bus;
	int ret;

	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return -ENOMEM;

	ret = of_get_gpio(ofdev->dev.of_node, 0);
	if (ret < 0)
	goto out_free;
	pdata->mdc = ret;

	ret = of_get_gpio(ofdev->dev.of_node, 1);
	if (ret < 0)
	goto out_free;
	pdata->mdio = ret;

	new_bus = mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
	if (!new_bus)
	goto out_free;

	ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
	if (ret)
	mdio_gpio_bus_deinit(&ofdev->dev);

	return ret;

	out_free:
	kfree(pdata);
	return -ENODEV;
	}

	static int __devexit mdio_ofgpio_remove(struct platform_device *ofdev)
	{
	mdio_gpio_bus_destroy(&ofdev->dev);
	kfree(ofdev->dev.platform_data);

	return 0;
	}

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

	static struct platform_driver mdio_ofgpio_driver = {
	.driver = {
	.name = "mdio-ofgpio",
	.owner = THIS_MODULE,
	.of_match_table = mdio_ofgpio_match,
	},
	.probe = mdio_ofgpio_probe,
	.remove = __devexit_p(mdio_ofgpio_remove),
	};

	static inline int __init mdio_ofgpio_init(void)
	{
	return platform_driver_register(&mdio_ofgpio_driver);
	}

	static inline void __exit mdio_ofgpio_exit(void)
	{
	platform_driver_unregister(&mdio_ofgpio_driver);
	}
	#else
	static inline int __init mdio_ofgpio_init(void) { return 0; }
	static inline void __exit mdio_ofgpio_exit(void) { }
	#endif /* CONFIG_OF_GPIO */

	static struct platform_driver mdio_gpio_driver = {
	.probe = mdio_gpio_probe,
	.remove = __devexit_p(mdio_gpio_remove),
	.driver = {
	.name = "mdio-gpio",
	.owner = THIS_MODULE,
	},
	};

	static int __init mdio_gpio_init(void)
	{
	int ret;

	ret = mdio_ofgpio_init();
	if (ret)
	return ret;

	ret = platform_driver_register(&mdio_gpio_driver);
	if (ret)
	mdio_ofgpio_exit();

	return ret;
	}
	module_init(mdio_gpio_init);

	static void __exit mdio_gpio_exit(void)
	{
	platform_driver_unregister(&mdio_gpio_driver);
	mdio_ofgpio_exit();
	}
	module_exit(mdio_gpio_exit);

	MODULE_ALIAS("platform:mdio-gpio");
	MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");