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Laurent Pincharta5edecc2008-05-26 11:53:21 +02001/*
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +00002 * GPIO based MDIO bitbang driver.
3 * Supports OpenFirmware.
Laurent Pincharta5edecc2008-05-26 11:53:21 +02004 *
5 * Copyright (c) 2008 CSE Semaphore Belgium.
6 * by Laurent Pinchart <laurentp@cse-semaphore.com>
7 *
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +00008 * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
9 *
Laurent Pincharta5edecc2008-05-26 11:53:21 +020010 * Based on earlier work by
11 *
12 * Copyright (c) 2003 Intracom S.A.
13 * by Pantelis Antoniou <panto@intracom.gr>
14 *
15 * 2005 (c) MontaVista Software, Inc.
16 * Vitaly Bordug <vbordug@ru.mvista.com>
17 *
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.
21 */
22
23#include <linux/module.h>
24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/interrupt.h>
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +000027#include <linux/platform_device.h>
28#include <linux/gpio.h>
29#include <linux/mdio-gpio.h>
30
31#ifdef CONFIG_OF_GPIO
Laurent Pincharta5edecc2008-05-26 11:53:21 +020032#include <linux/of_gpio.h>
Mark Waredacac4d2009-07-23 10:56:48 -070033#include <linux/of_mdio.h>
Laurent Pincharta5edecc2008-05-26 11:53:21 +020034#include <linux/of_platform.h>
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +000035#endif
Laurent Pincharta5edecc2008-05-26 11:53:21 +020036
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
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +000053static int mdio_get(struct mdiobb_ctrl *ctrl)
Laurent Pincharta5edecc2008-05-26 11:53:21 +020054{
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
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +000061static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
Laurent Pincharta5edecc2008-05-26 11:53:21 +020062{
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
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +000069static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
Laurent Pincharta5edecc2008-05-26 11:53:21 +020070{
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,
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +000079 .set_mdc = mdc_set,
Laurent Pincharta5edecc2008-05-26 11:53:21 +020080 .set_mdio_dir = mdio_dir,
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +000081 .set_mdio_data = mdio_set,
82 .get_mdio_data = mdio_get,
Laurent Pincharta5edecc2008-05-26 11:53:21 +020083};
84
Mark Waredacac4d2009-07-23 10:56:48 -070085static struct mii_bus * __devinit mdio_gpio_bus_init(struct device *dev,
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +000086 struct mdio_gpio_platform_data *pdata,
87 int bus_id)
Laurent Pincharta5edecc2008-05-26 11:53:21 +020088{
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +000089 struct mii_bus *new_bus;
90 struct mdio_gpio_info *bitbang;
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +000091 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
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000107 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
Paulius Zaleckas664f93b2009-02-08 23:46:01 +0000126 gpio_direction_output(bitbang->mdc, 0);
127
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000128 dev_set_drvdata(dev, new_bus);
129
Mark Waredacac4d2009-07-23 10:56:48 -0700130 return new_bus;
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000131
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000132out_free_mdc:
133 gpio_free(bitbang->mdc);
134out_free_bus:
135 free_mdio_bitbang(new_bus);
136out_free_bitbang:
137 kfree(bitbang);
138out:
Mark Waredacac4d2009-07-23 10:56:48 -0700139 return NULL;
140}
141
Stephen Rothwellf99b4a02009-11-16 22:47:33 +0000142static void mdio_gpio_bus_deinit(struct device *dev)
Mark Waredacac4d2009-07-23 10:56:48 -0700143{
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);
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000152}
153
154static void __devexit mdio_gpio_bus_destroy(struct device *dev)
155{
156 struct mii_bus *bus = dev_get_drvdata(dev);
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200157
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000158 mdiobus_unregister(bus);
Mark Waredacac4d2009-07-23 10:56:48 -0700159 mdio_gpio_bus_deinit(dev);
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000160}
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200161
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000162static int __devinit mdio_gpio_probe(struct platform_device *pdev)
163{
164 struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data;
Mark Waredacac4d2009-07-23 10:56:48 -0700165 struct mii_bus *new_bus;
166 int ret;
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000167
168 if (!pdata)
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200169 return -ENODEV;
170
Mark Waredacac4d2009-07-23 10:56:48 -0700171 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;
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000180}
181
182static int __devexit mdio_gpio_remove(struct platform_device *pdev)
183{
184 mdio_gpio_bus_destroy(&pdev->dev);
185
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200186 return 0;
187}
188
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000189#ifdef CONFIG_OF_GPIO
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200190
Grant Likely74888762011-02-22 21:05:51 -0700191static int __devinit mdio_ofgpio_probe(struct platform_device *ofdev)
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200192{
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000193 struct mdio_gpio_platform_data *pdata;
Mark Waredacac4d2009-07-23 10:56:48 -0700194 struct mii_bus *new_bus;
Roel Kluin57a57492009-01-19 17:14:21 -0800195 int ret;
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200196
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000197 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
198 if (!pdata)
199 return -ENOMEM;
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200200
Grant Likely61c7a082010-04-13 16:12:29 -0700201 ret = of_get_gpio(ofdev->dev.of_node, 0);
Roel Kluin57a57492009-01-19 17:14:21 -0800202 if (ret < 0)
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000203 goto out_free;
Roel Kluin57a57492009-01-19 17:14:21 -0800204 pdata->mdc = ret;
205
Grant Likely61c7a082010-04-13 16:12:29 -0700206 ret = of_get_gpio(ofdev->dev.of_node, 1);
Roel Kluin57a57492009-01-19 17:14:21 -0800207 if (ret < 0)
Mark Waredacac4d2009-07-23 10:56:48 -0700208 goto out_free;
Roel Kluin57a57492009-01-19 17:14:21 -0800209 pdata->mdio = ret;
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200210
Mark Waredacac4d2009-07-23 10:56:48 -0700211 new_bus = mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
212 if (!new_bus)
Julia Lawalla4b11642009-09-11 06:22:09 +0000213 goto out_free;
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200214
Grant Likely61c7a082010-04-13 16:12:29 -0700215 ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
Mark Waredacac4d2009-07-23 10:56:48 -0700216 if (ret)
217 mdio_gpio_bus_deinit(&ofdev->dev);
218
219 return ret;
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200220
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000221out_free:
222 kfree(pdata);
223 return -ENODEV;
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200224}
225
Grant Likely2dc11582010-08-06 09:25:50 -0600226static int __devexit mdio_ofgpio_remove(struct platform_device *ofdev)
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200227{
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000228 mdio_gpio_bus_destroy(&ofdev->dev);
229 kfree(ofdev->dev.platform_data);
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200230
231 return 0;
232}
233
234static struct of_device_id mdio_ofgpio_match[] = {
235 {
236 .compatible = "virtual,mdio-gpio",
237 },
238 {},
239};
Anton Vorontsove72701a2009-10-14 14:54:52 -0700240MODULE_DEVICE_TABLE(of, mdio_ofgpio_match);
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200241
Grant Likely74888762011-02-22 21:05:51 -0700242static struct platform_driver mdio_ofgpio_driver = {
Grant Likely40182942010-04-13 16:13:02 -0700243 .driver = {
244 .name = "mdio-gpio",
245 .owner = THIS_MODULE,
246 .of_match_table = mdio_ofgpio_match,
247 },
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200248 .probe = mdio_ofgpio_probe,
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000249 .remove = __devexit_p(mdio_ofgpio_remove),
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200250};
251
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000252static inline int __init mdio_ofgpio_init(void)
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200253{
Grant Likely74888762011-02-22 21:05:51 -0700254 return platform_driver_register(&mdio_ofgpio_driver);
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200255}
256
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000257static inline void __exit mdio_ofgpio_exit(void)
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200258{
Grant Likely74888762011-02-22 21:05:51 -0700259 platform_driver_unregister(&mdio_ofgpio_driver);
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200260}
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000261#else
262static inline int __init mdio_ofgpio_init(void) { return 0; }
263static inline void __exit mdio_ofgpio_exit(void) { }
264#endif /* CONFIG_OF_GPIO */
Laurent Pincharta5edecc2008-05-26 11:53:21 +0200265
Paulius Zaleckasf004f3e2008-11-14 00:24:34 +0000266static struct platform_driver mdio_gpio_driver = {
267 .probe = mdio_gpio_probe,
268 .remove = __devexit_p(mdio_gpio_remove),
269 .driver = {
270 .name = "mdio-gpio",
271 .owner = THIS_MODULE,
272 },
273};
274
275static int __init mdio_gpio_init(void)
276{
277 int ret;
278
279 ret = mdio_ofgpio_init();
280 if (ret)
281 return ret;
282
283 ret = platform_driver_register(&mdio_gpio_driver);
284 if (ret)
285 mdio_ofgpio_exit();
286
287 return ret;
288}
289module_init(mdio_gpio_init);
290
291static void __exit mdio_gpio_exit(void)
292{
293 platform_driver_unregister(&mdio_gpio_driver);
294 mdio_ofgpio_exit();
295}
296module_exit(mdio_gpio_exit);
297
298MODULE_ALIAS("platform:mdio-gpio");
299MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
300MODULE_LICENSE("GPL");
301MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");