/*
* 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->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, "%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 of_device *ofdev,
const struct of_device_id *match)
{
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->node, 0);
if (ret < 0)
goto out_free;
pdata->mdc = ret;
ret = of_get_gpio(ofdev->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->node);
if (ret)
mdio_gpio_bus_deinit(&ofdev->dev);
return ret;
out_free:
kfree(pdata);
return -ENODEV;
}
static int __devexit mdio_ofgpio_remove(struct of_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 of_platform_driver mdio_ofgpio_driver = {
.name = "mdio-gpio",
.match_table = mdio_ofgpio_match,
.probe = mdio_ofgpio_probe,
.remove = __devexit_p(mdio_ofgpio_remove),
};
static inline int __init mdio_ofgpio_init(void)
{
return of_register_platform_driver(&mdio_ofgpio_driver);
}
static inline void __exit mdio_ofgpio_exit(void)
{
of_unregister_platform_driver(&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");
