2 * GPIO based MDIO bitbang driver.
3 * Supports OpenFirmware.
5 * Copyright (c) 2008 CSE Semaphore Belgium.
6 * by Laurent Pinchart <laurentp@cse-semaphore.com>
8 * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
10 * Based on earlier work by
12 * Copyright (c) 2003 Intracom S.A.
13 * by Pantelis Antoniou <panto@intracom.gr>
15 * 2005 (c) MontaVista Software, Inc.
16 * Vitaly Bordug <vbordug@ru.mvista.com>
18 * This file is licensed under the terms of the GNU General Public License
19 * version 2. This program is licensed "as is" without any warranty of any
20 * kind, whether express or implied.
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/platform_device.h>
28 #include <linux/gpio.h>
29 #include <linux/mdio-gpio.h>
32 #include <linux/of_gpio.h>
33 #include <linux/of_platform.h>
36 struct mdio_gpio_info {
37 struct mdiobb_ctrl ctrl;
41 static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
43 struct mdio_gpio_info *bitbang =
44 container_of(ctrl, struct mdio_gpio_info, ctrl);
47 gpio_direction_output(bitbang->mdio, 1);
49 gpio_direction_input(bitbang->mdio);
52 static int mdio_get(struct mdiobb_ctrl *ctrl)
54 struct mdio_gpio_info *bitbang =
55 container_of(ctrl, struct mdio_gpio_info, ctrl);
57 return gpio_get_value(bitbang->mdio);
60 static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
62 struct mdio_gpio_info *bitbang =
63 container_of(ctrl, struct mdio_gpio_info, ctrl);
65 gpio_set_value(bitbang->mdio, what);
68 static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
70 struct mdio_gpio_info *bitbang =
71 container_of(ctrl, struct mdio_gpio_info, ctrl);
73 gpio_set_value(bitbang->mdc, what);
76 static struct mdiobb_ops mdio_gpio_ops = {
79 .set_mdio_dir = mdio_dir,
80 .set_mdio_data = mdio_set,
81 .get_mdio_data = mdio_get,
84 static int __devinit mdio_gpio_bus_init(struct device *dev,
85 struct mdio_gpio_platform_data *pdata,
88 struct mii_bus *new_bus;
89 struct mdio_gpio_info *bitbang;
93 bitbang = kzalloc(sizeof(*bitbang), GFP_KERNEL);
97 bitbang->ctrl.ops = &mdio_gpio_ops;
98 bitbang->mdc = pdata->mdc;
99 bitbang->mdio = pdata->mdio;
101 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
103 goto out_free_bitbang;
105 new_bus->name = "GPIO Bitbanged MDIO",
109 new_bus->phy_mask = pdata->phy_mask;
110 new_bus->irq = pdata->irqs;
111 new_bus->parent = dev;
113 if (new_bus->phy_mask == ~0)
116 for (i = 0; i < PHY_MAX_ADDR; i++)
117 if (!new_bus->irq[i])
118 new_bus->irq[i] = PHY_POLL;
120 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", bus_id);
122 if (gpio_request(bitbang->mdc, "mdc"))
125 if (gpio_request(bitbang->mdio, "mdio"))
128 dev_set_drvdata(dev, new_bus);
130 ret = mdiobus_register(new_bus);
137 dev_set_drvdata(dev, NULL);
138 gpio_free(bitbang->mdio);
140 gpio_free(bitbang->mdc);
142 free_mdio_bitbang(new_bus);
149 static void __devexit mdio_gpio_bus_destroy(struct device *dev)
151 struct mii_bus *bus = dev_get_drvdata(dev);
152 struct mdio_gpio_info *bitbang = bus->priv;
154 mdiobus_unregister(bus);
155 free_mdio_bitbang(bus);
156 dev_set_drvdata(dev, NULL);
157 gpio_free(bitbang->mdc);
158 gpio_free(bitbang->mdio);
162 static int __devinit mdio_gpio_probe(struct platform_device *pdev)
164 struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data;
169 return mdio_gpio_bus_init(&pdev->dev, pdata, pdev->id);
172 static int __devexit mdio_gpio_remove(struct platform_device *pdev)
174 mdio_gpio_bus_destroy(&pdev->dev);
179 #ifdef CONFIG_OF_GPIO
180 static void __devinit add_phy(struct mdio_gpio_platform_data *pdata,
181 struct device_node *np)
186 data = of_get_property(np, "reg", &len);
187 if (!data || len != 4)
191 pdata->phy_mask &= ~(1 << id);
193 irq = of_irq_to_resource(np, 0, NULL);
195 pdata->irqs[id] = irq;
198 static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
199 const struct of_device_id *match)
201 struct device_node *np = NULL;
202 struct mdio_gpio_platform_data *pdata;
204 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
208 pdata->mdc = of_get_gpio(ofdev->node, 0);
209 pdata->mdio = of_get_gpio(ofdev->node, 1);
211 if (pdata->mdc < 0 || pdata->mdio < 0)
214 while ((np = of_get_next_child(ofdev->node, np)))
215 if (!strcmp(np->type, "ethernet-phy"))
218 return mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
225 static int __devexit mdio_ofgpio_remove(struct of_device *ofdev)
227 mdio_gpio_bus_destroy(&ofdev->dev);
228 kfree(ofdev->dev.platform_data);
233 static struct of_device_id mdio_ofgpio_match[] = {
235 .compatible = "virtual,mdio-gpio",
240 static struct of_platform_driver mdio_ofgpio_driver = {
242 .match_table = mdio_ofgpio_match,
243 .probe = mdio_ofgpio_probe,
244 .remove = __devexit_p(mdio_ofgpio_remove),
247 static inline int __init mdio_ofgpio_init(void)
249 return of_register_platform_driver(&mdio_ofgpio_driver);
252 static inline void __exit mdio_ofgpio_exit(void)
254 of_unregister_platform_driver(&mdio_ofgpio_driver);
257 static inline int __init mdio_ofgpio_init(void) { return 0; }
258 static inline void __exit mdio_ofgpio_exit(void) { }
259 #endif /* CONFIG_OF_GPIO */
261 static struct platform_driver mdio_gpio_driver = {
262 .probe = mdio_gpio_probe,
263 .remove = __devexit_p(mdio_gpio_remove),
266 .owner = THIS_MODULE,
270 static int __init mdio_gpio_init(void)
274 ret = mdio_ofgpio_init();
278 ret = platform_driver_register(&mdio_gpio_driver);
284 module_init(mdio_gpio_init);
286 static void __exit mdio_gpio_exit(void)
288 platform_driver_unregister(&mdio_gpio_driver);
291 module_exit(mdio_gpio_exit);
293 MODULE_ALIAS("platform:mdio-gpio");
294 MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
295 MODULE_LICENSE("GPL");
296 MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");