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1/*
2 * GPIO based MDIO bitbang driver.
3 * Supports OpenFirmware.
4 *
5 * Copyright (c) 2008 CSE Semaphore Belgium.
6 * by Laurent Pinchart <laurentp@cse-semaphore.com>
7 *
8 * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
9 *
10 * 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>
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 platform_device *ofdev)
192{
193 struct mdio_gpio_platform_data *pdata;
194 struct mii_bus *new_bus;
195 int ret;
196
197 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
198 if (!pdata)
199 return -ENOMEM;
200
201 ret = of_get_gpio(ofdev->dev.of_node, 0);
202 if (ret < 0)
203 goto out_free;
204 pdata->mdc = ret;
205
206 ret = of_get_gpio(ofdev->dev.of_node, 1);
207 if (ret < 0)
208 goto out_free;
209 pdata->mdio = ret;
210
211 new_bus = mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
212 if (!new_bus)
213 goto out_free;
214
215 ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
216 if (ret)
217 mdio_gpio_bus_deinit(&ofdev->dev);
218
219 return ret;
220
221out_free:
222 kfree(pdata);
223 return -ENODEV;
224}
225
226static int __devexit mdio_ofgpio_remove(struct platform_device *ofdev)
227{
228 mdio_gpio_bus_destroy(&ofdev->dev);
229 kfree(ofdev->dev.platform_data);
230
231 return 0;
232}
233
234static struct of_device_id mdio_ofgpio_match[] = {
235 {
236 .compatible = "virtual,mdio-gpio",
237 },
238 {},
239};
240MODULE_DEVICE_TABLE(of, mdio_ofgpio_match);
241
242static struct platform_driver mdio_ofgpio_driver = {
243 .driver = {
244 .name = "mdio-gpio",
245 .owner = THIS_MODULE,
246 .of_match_table = mdio_ofgpio_match,
247 },
248 .probe = mdio_ofgpio_probe,
249 .remove = __devexit_p(mdio_ofgpio_remove),
250};
251
252static inline int __init mdio_ofgpio_init(void)
253{
254 return platform_driver_register(&mdio_ofgpio_driver);
255}
256
257static inline void __exit mdio_ofgpio_exit(void)
258{
259 platform_driver_unregister(&mdio_ofgpio_driver);
260}
261#else
262static inline int __init mdio_ofgpio_init(void) { return 0; }
263static inline void __exit mdio_ofgpio_exit(void) { }
264#endif /* CONFIG_OF_GPIO */
265
266static 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");
1/*
2 * GPIO based MDIO bitbang driver.
3 * Supports OpenFirmware.
4 *
5 * Copyright (c) 2008 CSE Semaphore Belgium.
6 * by Laurent Pinchart <laurentp@cse-semaphore.com>
7 *
8 * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
9 *
10 * 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/interrupt.h>
26#include <linux/platform_device.h>
27#include <linux/gpio.h>
28#include <linux/platform_data/mdio-gpio.h>
29
30#include <linux/of_gpio.h>
31#include <linux/of_mdio.h>
32
33struct mdio_gpio_info {
34 struct mdiobb_ctrl ctrl;
35 struct gpio_desc *mdc, *mdio, *mdo;
36};
37
38static void *mdio_gpio_of_get_data(struct platform_device *pdev)
39{
40 struct device_node *np = pdev->dev.of_node;
41 struct mdio_gpio_platform_data *pdata;
42 enum of_gpio_flags flags;
43 int ret;
44
45 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
46 if (!pdata)
47 return NULL;
48
49 ret = of_get_gpio_flags(np, 0, &flags);
50 if (ret < 0)
51 return NULL;
52
53 pdata->mdc = ret;
54 pdata->mdc_active_low = flags & OF_GPIO_ACTIVE_LOW;
55
56 ret = of_get_gpio_flags(np, 1, &flags);
57 if (ret < 0)
58 return NULL;
59 pdata->mdio = ret;
60 pdata->mdio_active_low = flags & OF_GPIO_ACTIVE_LOW;
61
62 ret = of_get_gpio_flags(np, 2, &flags);
63 if (ret > 0) {
64 pdata->mdo = ret;
65 pdata->mdo_active_low = flags & OF_GPIO_ACTIVE_LOW;
66 }
67
68 return pdata;
69}
70
71static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
72{
73 struct mdio_gpio_info *bitbang =
74 container_of(ctrl, struct mdio_gpio_info, ctrl);
75
76 if (bitbang->mdo) {
77 /* Separate output pin. Always set its value to high
78 * when changing direction. If direction is input,
79 * assume the pin serves as pull-up. If direction is
80 * output, the default value is high.
81 */
82 gpiod_set_value(bitbang->mdo, 1);
83 return;
84 }
85
86 if (dir)
87 gpiod_direction_output(bitbang->mdio, 1);
88 else
89 gpiod_direction_input(bitbang->mdio);
90}
91
92static int mdio_get(struct mdiobb_ctrl *ctrl)
93{
94 struct mdio_gpio_info *bitbang =
95 container_of(ctrl, struct mdio_gpio_info, ctrl);
96
97 return gpiod_get_value(bitbang->mdio);
98}
99
100static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
101{
102 struct mdio_gpio_info *bitbang =
103 container_of(ctrl, struct mdio_gpio_info, ctrl);
104
105 if (bitbang->mdo)
106 gpiod_set_value(bitbang->mdo, what);
107 else
108 gpiod_set_value(bitbang->mdio, what);
109}
110
111static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
112{
113 struct mdio_gpio_info *bitbang =
114 container_of(ctrl, struct mdio_gpio_info, ctrl);
115
116 gpiod_set_value(bitbang->mdc, what);
117}
118
119static const struct mdiobb_ops mdio_gpio_ops = {
120 .owner = THIS_MODULE,
121 .set_mdc = mdc_set,
122 .set_mdio_dir = mdio_dir,
123 .set_mdio_data = mdio_set,
124 .get_mdio_data = mdio_get,
125};
126
127static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
128 struct mdio_gpio_platform_data *pdata,
129 int bus_id)
130{
131 struct mii_bus *new_bus;
132 struct mdio_gpio_info *bitbang;
133 int i;
134 int mdc, mdio, mdo;
135 unsigned long mdc_flags = GPIOF_OUT_INIT_LOW;
136 unsigned long mdio_flags = GPIOF_DIR_IN;
137 unsigned long mdo_flags = GPIOF_OUT_INIT_HIGH;
138
139 bitbang = devm_kzalloc(dev, sizeof(*bitbang), GFP_KERNEL);
140 if (!bitbang)
141 goto out;
142
143 bitbang->ctrl.ops = &mdio_gpio_ops;
144 bitbang->ctrl.reset = pdata->reset;
145 mdc = pdata->mdc;
146 bitbang->mdc = gpio_to_desc(mdc);
147 if (pdata->mdc_active_low)
148 mdc_flags = GPIOF_OUT_INIT_HIGH | GPIOF_ACTIVE_LOW;
149 mdio = pdata->mdio;
150 bitbang->mdio = gpio_to_desc(mdio);
151 if (pdata->mdio_active_low)
152 mdio_flags |= GPIOF_ACTIVE_LOW;
153 mdo = pdata->mdo;
154 if (mdo) {
155 bitbang->mdo = gpio_to_desc(mdo);
156 if (pdata->mdo_active_low)
157 mdo_flags = GPIOF_OUT_INIT_LOW | GPIOF_ACTIVE_LOW;
158 }
159
160 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
161 if (!new_bus)
162 goto out;
163
164 new_bus->name = "GPIO Bitbanged MDIO",
165
166 new_bus->phy_mask = pdata->phy_mask;
167 new_bus->phy_ignore_ta_mask = pdata->phy_ignore_ta_mask;
168 memcpy(new_bus->irq, pdata->irqs, sizeof(new_bus->irq));
169 new_bus->parent = dev;
170
171 if (new_bus->phy_mask == ~0)
172 goto out_free_bus;
173
174 for (i = 0; i < PHY_MAX_ADDR; i++)
175 if (!new_bus->irq[i])
176 new_bus->irq[i] = PHY_POLL;
177
178 if (bus_id != -1)
179 snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
180 else
181 strncpy(new_bus->id, "gpio", MII_BUS_ID_SIZE);
182
183 if (devm_gpio_request_one(dev, mdc, mdc_flags, "mdc"))
184 goto out_free_bus;
185
186 if (devm_gpio_request_one(dev, mdio, mdio_flags, "mdio"))
187 goto out_free_bus;
188
189 if (mdo && devm_gpio_request_one(dev, mdo, mdo_flags, "mdo"))
190 goto out_free_bus;
191
192 dev_set_drvdata(dev, new_bus);
193
194 return new_bus;
195
196out_free_bus:
197 free_mdio_bitbang(new_bus);
198out:
199 return NULL;
200}
201
202static void mdio_gpio_bus_deinit(struct device *dev)
203{
204 struct mii_bus *bus = dev_get_drvdata(dev);
205
206 free_mdio_bitbang(bus);
207}
208
209static void mdio_gpio_bus_destroy(struct device *dev)
210{
211 struct mii_bus *bus = dev_get_drvdata(dev);
212
213 mdiobus_unregister(bus);
214 mdio_gpio_bus_deinit(dev);
215}
216
217static int mdio_gpio_probe(struct platform_device *pdev)
218{
219 struct mdio_gpio_platform_data *pdata;
220 struct mii_bus *new_bus;
221 int ret, bus_id;
222
223 if (pdev->dev.of_node) {
224 pdata = mdio_gpio_of_get_data(pdev);
225 bus_id = of_alias_get_id(pdev->dev.of_node, "mdio-gpio");
226 if (bus_id < 0) {
227 dev_warn(&pdev->dev, "failed to get alias id\n");
228 bus_id = 0;
229 }
230 } else {
231 pdata = dev_get_platdata(&pdev->dev);
232 bus_id = pdev->id;
233 }
234
235 if (!pdata)
236 return -ENODEV;
237
238 new_bus = mdio_gpio_bus_init(&pdev->dev, pdata, bus_id);
239 if (!new_bus)
240 return -ENODEV;
241
242 if (pdev->dev.of_node)
243 ret = of_mdiobus_register(new_bus, pdev->dev.of_node);
244 else
245 ret = mdiobus_register(new_bus);
246
247 if (ret)
248 mdio_gpio_bus_deinit(&pdev->dev);
249
250 return ret;
251}
252
253static int mdio_gpio_remove(struct platform_device *pdev)
254{
255 mdio_gpio_bus_destroy(&pdev->dev);
256
257 return 0;
258}
259
260static const struct of_device_id mdio_gpio_of_match[] = {
261 { .compatible = "virtual,mdio-gpio", },
262 { /* sentinel */ }
263};
264MODULE_DEVICE_TABLE(of, mdio_gpio_of_match);
265
266static struct platform_driver mdio_gpio_driver = {
267 .probe = mdio_gpio_probe,
268 .remove = mdio_gpio_remove,
269 .driver = {
270 .name = "mdio-gpio",
271 .of_match_table = mdio_gpio_of_match,
272 },
273};
274
275module_platform_driver(mdio_gpio_driver);
276
277MODULE_ALIAS("platform:mdio-gpio");
278MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
279MODULE_LICENSE("GPL");
280MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");