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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>
30
31#ifdef CONFIG_OF_GPIO
32#include <linux/of_gpio.h>
33#include <linux/of_mdio.h>
34#include <linux/of_platform.h>
35#endif
36
37struct mdio_gpio_info {
38 struct mdiobb_ctrl ctrl;
39 int mdc, mdio;
40};
41
42static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
43{
44 struct mdio_gpio_info *bitbang =
45 container_of(ctrl, struct mdio_gpio_info, ctrl);
46
47 if (dir)
48 gpio_direction_output(bitbang->mdio, 1);
49 else
50 gpio_direction_input(bitbang->mdio);
51}
52
53static int mdio_get(struct mdiobb_ctrl *ctrl)
54{
55 struct mdio_gpio_info *bitbang =
56 container_of(ctrl, struct mdio_gpio_info, ctrl);
57
58 return gpio_get_value(bitbang->mdio);
59}
60
61static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
62{
63 struct mdio_gpio_info *bitbang =
64 container_of(ctrl, struct mdio_gpio_info, ctrl);
65
66 gpio_set_value(bitbang->mdio, what);
67}
68
69static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
70{
71 struct mdio_gpio_info *bitbang =
72 container_of(ctrl, struct mdio_gpio_info, ctrl);
73
74 gpio_set_value(bitbang->mdc, what);
75}
76
77static struct mdiobb_ops mdio_gpio_ops = {
78 .owner = THIS_MODULE,
79 .set_mdc = mdc_set,
80 .set_mdio_dir = mdio_dir,
81 .set_mdio_data = mdio_set,
82 .get_mdio_data = mdio_get,
83};
84
85static struct mii_bus * __devinit mdio_gpio_bus_init(struct device *dev,
86 struct mdio_gpio_platform_data *pdata,
87 int bus_id)
88{
89 struct mii_bus *new_bus;
90 struct mdio_gpio_info *bitbang;
91 int i;
92
93 bitbang = kzalloc(sizeof(*bitbang), GFP_KERNEL);
94 if (!bitbang)
95 goto out;
96
97 bitbang->ctrl.ops = &mdio_gpio_ops;
98 bitbang->mdc = pdata->mdc;
99 bitbang->mdio = pdata->mdio;
100
101 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
102 if (!new_bus)
103 goto out_free_bitbang;
104
105 new_bus->name = "GPIO Bitbanged MDIO",
106
107 new_bus->phy_mask = pdata->phy_mask;
108 new_bus->irq = pdata->irqs;
109 new_bus->parent = dev;
110
111 if (new_bus->phy_mask == ~0)
112 goto out_free_bus;
113
114 for (i = 0; i < PHY_MAX_ADDR; i++)
115 if (!new_bus->irq[i])
116 new_bus->irq[i] = PHY_POLL;
117
118 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", bus_id);
119
120 if (gpio_request(bitbang->mdc, "mdc"))
121 goto out_free_bus;
122
123 if (gpio_request(bitbang->mdio, "mdio"))
124 goto out_free_mdc;
125
126 gpio_direction_output(bitbang->mdc, 0);
127
128 dev_set_drvdata(dev, new_bus);
129
130 return new_bus;
131
132out_free_mdc:
133 gpio_free(bitbang->mdc);
134out_free_bus:
135 free_mdio_bitbang(new_bus);
136out_free_bitbang:
137 kfree(bitbang);
138out:
139 return NULL;
140}
141
142static void mdio_gpio_bus_deinit(struct device *dev)
143{
144 struct mii_bus *bus = dev_get_drvdata(dev);
145 struct mdio_gpio_info *bitbang = bus->priv;
146
147 dev_set_drvdata(dev, NULL);
148 gpio_free(bitbang->mdio);
149 gpio_free(bitbang->mdc);
150 free_mdio_bitbang(bus);
151 kfree(bitbang);
152}
153
154static void __devexit mdio_gpio_bus_destroy(struct device *dev)
155{
156 struct mii_bus *bus = dev_get_drvdata(dev);
157
158 mdiobus_unregister(bus);
159 mdio_gpio_bus_deinit(dev);
160}
161
162static int __devinit mdio_gpio_probe(struct platform_device *pdev)
163{
164 struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data;
165 struct mii_bus *new_bus;
166 int ret;
167
168 if (!pdata)
169 return -ENODEV;
170
171 new_bus = mdio_gpio_bus_init(&pdev->dev, pdata, pdev->id);
172 if (!new_bus)
173 return -ENODEV;
174
175 ret = mdiobus_register(new_bus);
176 if (ret)
177 mdio_gpio_bus_deinit(&pdev->dev);
178
179 return ret;
180}
181
182static int __devexit mdio_gpio_remove(struct platform_device *pdev)
183{
184 mdio_gpio_bus_destroy(&pdev->dev);
185
186 return 0;
187}
188
189#ifdef CONFIG_OF_GPIO
190
191static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
192 const struct of_device_id *match)
193{
194 struct mdio_gpio_platform_data *pdata;
195 struct mii_bus *new_bus;
196 int ret;
197
198 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
199 if (!pdata)
200 return -ENOMEM;
201
202 ret = of_get_gpio(ofdev->node, 0);
203 if (ret < 0)
204 goto out_free;
205 pdata->mdc = ret;
206
207 ret = of_get_gpio(ofdev->node, 1);
208 if (ret < 0)
209 goto out_free;
210 pdata->mdio = ret;
211
212 new_bus = mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
213 if (!new_bus)
214 goto out_free;
215
216 ret = of_mdiobus_register(new_bus, ofdev->node);
217 if (ret)
218 mdio_gpio_bus_deinit(&ofdev->dev);
219
220 return ret;
221
222out_free:
223 kfree(pdata);
224 return -ENODEV;
225}
226
227static int __devexit mdio_ofgpio_remove(struct of_device *ofdev)
228{
229 mdio_gpio_bus_destroy(&ofdev->dev);
230 kfree(ofdev->dev.platform_data);
231
232 return 0;
233}
234
235static struct of_device_id mdio_ofgpio_match[] = {
236 {
237 .compatible = "virtual,mdio-gpio",
238 },
239 {},
240};
241MODULE_DEVICE_TABLE(of, mdio_ofgpio_match);
242
243static struct of_platform_driver mdio_ofgpio_driver = {
244 .name = "mdio-gpio",
245 .match_table = mdio_ofgpio_match,
246 .probe = mdio_ofgpio_probe,
247 .remove = __devexit_p(mdio_ofgpio_remove),
248};
249
250static inline int __init mdio_ofgpio_init(void)
251{
252 return of_register_platform_driver(&mdio_ofgpio_driver);
253}
254
255static inline void __exit mdio_ofgpio_exit(void)
256{
257 of_unregister_platform_driver(&mdio_ofgpio_driver);
258}
259#else
260static inline int __init mdio_ofgpio_init(void) { return 0; }
261static inline void __exit mdio_ofgpio_exit(void) { }
262#endif
263
264static struct platform_driver mdio_gpio_driver = {
265 .probe = mdio_gpio_probe,
266 .remove = __devexit_p(mdio_gpio_remove),
267 .driver = {
268 .name = "mdio-gpio",
269 .owner = THIS_MODULE,
270 },
271};
272
273static int __init mdio_gpio_init(void)
274{
275 int ret;
276
277 ret = mdio_ofgpio_init();
278 if (ret)
279 return ret;
280
281 ret = platform_driver_register(&mdio_gpio_driver);
282 if (ret)
283 mdio_ofgpio_exit();
284
285 return ret;
286}
287module_init(mdio_gpio_init);
288
289static void __exit mdio_gpio_exit(void)
290{
291 platform_driver_unregister(&mdio_gpio_driver);
292 mdio_ofgpio_exit();
293}
294module_exit(mdio_gpio_exit);
295
296MODULE_ALIAS("platform:mdio-gpio");
297MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
298MODULE_LICENSE("GPL");
299MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");
300
