303 lines
6.3 KiB
C
303 lines
6.3 KiB
C
/*
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* GPIO based MDIO bitbang driver.
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* Supports OpenFirmware.
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*
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* Copyright (c) 2008 CSE Semaphore Belgium.
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* by Laurent Pinchart <laurentp@cse-semaphore.com>
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*
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* Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
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*
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* Based on earlier work by
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*
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* Copyright (c) 2003 Intracom S.A.
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* by Pantelis Antoniou <panto@intracom.gr>
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*
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* 2005 (c) MontaVista Software, Inc.
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* Vitaly Bordug <vbordug@ru.mvista.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/mdio-gpio.h>
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#ifdef CONFIG_OF_GPIO
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#include <linux/of_gpio.h>
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#include <linux/of_mdio.h>
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#include <linux/of_platform.h>
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#endif
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struct mdio_gpio_info {
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struct mdiobb_ctrl ctrl;
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int mdc, mdio;
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};
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static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
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{
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struct mdio_gpio_info *bitbang =
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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if (dir)
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gpio_direction_output(bitbang->mdio, 1);
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else
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gpio_direction_input(bitbang->mdio);
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}
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static int mdio_get(struct mdiobb_ctrl *ctrl)
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{
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struct mdio_gpio_info *bitbang =
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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return gpio_get_value(bitbang->mdio);
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}
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static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
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{
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struct mdio_gpio_info *bitbang =
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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gpio_set_value(bitbang->mdio, what);
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}
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static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
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{
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struct mdio_gpio_info *bitbang =
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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gpio_set_value(bitbang->mdc, what);
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}
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static struct mdiobb_ops mdio_gpio_ops = {
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.owner = THIS_MODULE,
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.set_mdc = mdc_set,
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.set_mdio_dir = mdio_dir,
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.set_mdio_data = mdio_set,
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.get_mdio_data = mdio_get,
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};
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static struct mii_bus * __devinit mdio_gpio_bus_init(struct device *dev,
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struct mdio_gpio_platform_data *pdata,
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int bus_id)
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{
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struct mii_bus *new_bus;
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struct mdio_gpio_info *bitbang;
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int i;
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bitbang = kzalloc(sizeof(*bitbang), GFP_KERNEL);
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if (!bitbang)
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goto out;
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bitbang->ctrl.ops = &mdio_gpio_ops;
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bitbang->ctrl.reset = pdata->reset;
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bitbang->mdc = pdata->mdc;
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bitbang->mdio = pdata->mdio;
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new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
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if (!new_bus)
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goto out_free_bitbang;
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new_bus->name = "GPIO Bitbanged MDIO",
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new_bus->phy_mask = pdata->phy_mask;
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new_bus->irq = pdata->irqs;
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new_bus->parent = dev;
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if (new_bus->phy_mask == ~0)
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goto out_free_bus;
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for (i = 0; i < PHY_MAX_ADDR; i++)
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if (!new_bus->irq[i])
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new_bus->irq[i] = PHY_POLL;
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snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
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if (gpio_request(bitbang->mdc, "mdc"))
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goto out_free_bus;
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if (gpio_request(bitbang->mdio, "mdio"))
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goto out_free_mdc;
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gpio_direction_output(bitbang->mdc, 0);
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dev_set_drvdata(dev, new_bus);
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return new_bus;
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out_free_mdc:
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gpio_free(bitbang->mdc);
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out_free_bus:
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free_mdio_bitbang(new_bus);
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out_free_bitbang:
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kfree(bitbang);
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out:
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return NULL;
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}
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static void mdio_gpio_bus_deinit(struct device *dev)
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{
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struct mii_bus *bus = dev_get_drvdata(dev);
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struct mdio_gpio_info *bitbang = bus->priv;
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dev_set_drvdata(dev, NULL);
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gpio_free(bitbang->mdio);
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gpio_free(bitbang->mdc);
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free_mdio_bitbang(bus);
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kfree(bitbang);
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}
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static void __devexit mdio_gpio_bus_destroy(struct device *dev)
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{
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struct mii_bus *bus = dev_get_drvdata(dev);
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mdiobus_unregister(bus);
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mdio_gpio_bus_deinit(dev);
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}
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static int __devinit mdio_gpio_probe(struct platform_device *pdev)
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{
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struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data;
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struct mii_bus *new_bus;
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int ret;
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if (!pdata)
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return -ENODEV;
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new_bus = mdio_gpio_bus_init(&pdev->dev, pdata, pdev->id);
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if (!new_bus)
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return -ENODEV;
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ret = mdiobus_register(new_bus);
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if (ret)
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mdio_gpio_bus_deinit(&pdev->dev);
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return ret;
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}
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static int __devexit mdio_gpio_remove(struct platform_device *pdev)
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{
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mdio_gpio_bus_destroy(&pdev->dev);
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return 0;
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}
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#ifdef CONFIG_OF_GPIO
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static int __devinit mdio_ofgpio_probe(struct platform_device *ofdev)
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{
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struct mdio_gpio_platform_data *pdata;
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struct mii_bus *new_bus;
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int ret;
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pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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ret = of_get_gpio(ofdev->dev.of_node, 0);
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if (ret < 0)
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goto out_free;
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pdata->mdc = ret;
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ret = of_get_gpio(ofdev->dev.of_node, 1);
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if (ret < 0)
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goto out_free;
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pdata->mdio = ret;
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new_bus = mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
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if (!new_bus)
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goto out_free;
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ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
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if (ret)
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mdio_gpio_bus_deinit(&ofdev->dev);
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return ret;
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out_free:
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kfree(pdata);
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return -ENODEV;
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}
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static int __devexit mdio_ofgpio_remove(struct platform_device *ofdev)
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{
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mdio_gpio_bus_destroy(&ofdev->dev);
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kfree(ofdev->dev.platform_data);
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return 0;
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}
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static struct of_device_id mdio_ofgpio_match[] = {
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{
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.compatible = "virtual,mdio-gpio",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, mdio_ofgpio_match);
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static struct platform_driver mdio_ofgpio_driver = {
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.driver = {
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.name = "mdio-ofgpio",
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.owner = THIS_MODULE,
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.of_match_table = mdio_ofgpio_match,
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},
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.probe = mdio_ofgpio_probe,
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.remove = __devexit_p(mdio_ofgpio_remove),
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};
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static inline int __init mdio_ofgpio_init(void)
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{
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return platform_driver_register(&mdio_ofgpio_driver);
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}
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static inline void mdio_ofgpio_exit(void)
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{
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platform_driver_unregister(&mdio_ofgpio_driver);
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}
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#else
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static inline int __init mdio_ofgpio_init(void) { return 0; }
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static inline void mdio_ofgpio_exit(void) { }
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#endif /* CONFIG_OF_GPIO */
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static struct platform_driver mdio_gpio_driver = {
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.probe = mdio_gpio_probe,
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.remove = __devexit_p(mdio_gpio_remove),
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.driver = {
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.name = "mdio-gpio",
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.owner = THIS_MODULE,
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},
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};
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static int __init mdio_gpio_init(void)
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{
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int ret;
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ret = mdio_ofgpio_init();
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if (ret)
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return ret;
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ret = platform_driver_register(&mdio_gpio_driver);
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if (ret)
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mdio_ofgpio_exit();
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return ret;
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}
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module_init(mdio_gpio_init);
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static void __exit mdio_gpio_exit(void)
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{
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platform_driver_unregister(&mdio_gpio_driver);
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mdio_ofgpio_exit();
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}
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module_exit(mdio_gpio_exit);
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MODULE_ALIAS("platform:mdio-gpio");
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MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");
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