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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// SPDX-License-Identifier: GPL-2.0
2/*
3 * GPIO based MDIO bitbang driver.
4 * Supports OpenFirmware.
5 *
6 * Copyright (c) 2008 CSE Semaphore Belgium.
7 * by Laurent Pinchart <laurentp@cse-semaphore.com>
8 *
9 * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
10 *
11 * Based on earlier work by
12 *
13 * Copyright (c) 2003 Intracom S.A.
14 * by Pantelis Antoniou <panto@intracom.gr>
15 *
16 * 2005 (c) MontaVista Software, Inc.
17 * Vitaly Bordug <vbordug@ru.mvista.com>
18 */
19
20#include <linux/module.h>
21#include <linux/slab.h>
22#include <linux/interrupt.h>
23#include <linux/platform_device.h>
24#include <linux/platform_data/mdio-gpio.h>
25#include <linux/mdio-bitbang.h>
26#include <linux/mdio-gpio.h>
27#include <linux/gpio/consumer.h>
28#include <linux/of_mdio.h>
29
30struct mdio_gpio_info {
31 struct mdiobb_ctrl ctrl;
32 struct gpio_desc *mdc, *mdio, *mdo;
33};
34
35static int mdio_gpio_get_data(struct device *dev,
36 struct mdio_gpio_info *bitbang)
37{
38 bitbang->mdc = devm_gpiod_get_index(dev, NULL, MDIO_GPIO_MDC,
39 GPIOD_OUT_LOW);
40 if (IS_ERR(bitbang->mdc))
41 return PTR_ERR(bitbang->mdc);
42
43 bitbang->mdio = devm_gpiod_get_index(dev, NULL, MDIO_GPIO_MDIO,
44 GPIOD_IN);
45 if (IS_ERR(bitbang->mdio))
46 return PTR_ERR(bitbang->mdio);
47
48 bitbang->mdo = devm_gpiod_get_index_optional(dev, NULL, MDIO_GPIO_MDO,
49 GPIOD_OUT_LOW);
50 return PTR_ERR_OR_ZERO(bitbang->mdo);
51}
52
53static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
54{
55 struct mdio_gpio_info *bitbang =
56 container_of(ctrl, struct mdio_gpio_info, ctrl);
57
58 if (bitbang->mdo) {
59 /* Separate output pin. Always set its value to high
60 * when changing direction. If direction is input,
61 * assume the pin serves as pull-up. If direction is
62 * output, the default value is high.
63 */
64 gpiod_set_value_cansleep(bitbang->mdo, 1);
65 return;
66 }
67
68 if (dir)
69 gpiod_direction_output(bitbang->mdio, 1);
70 else
71 gpiod_direction_input(bitbang->mdio);
72}
73
74static int mdio_get(struct mdiobb_ctrl *ctrl)
75{
76 struct mdio_gpio_info *bitbang =
77 container_of(ctrl, struct mdio_gpio_info, ctrl);
78
79 return gpiod_get_value_cansleep(bitbang->mdio);
80}
81
82static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
83{
84 struct mdio_gpio_info *bitbang =
85 container_of(ctrl, struct mdio_gpio_info, ctrl);
86
87 if (bitbang->mdo)
88 gpiod_set_value_cansleep(bitbang->mdo, what);
89 else
90 gpiod_set_value_cansleep(bitbang->mdio, what);
91}
92
93static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
94{
95 struct mdio_gpio_info *bitbang =
96 container_of(ctrl, struct mdio_gpio_info, ctrl);
97
98 gpiod_set_value_cansleep(bitbang->mdc, what);
99}
100
101static const struct mdiobb_ops mdio_gpio_ops = {
102 .owner = THIS_MODULE,
103 .set_mdc = mdc_set,
104 .set_mdio_dir = mdio_dir,
105 .set_mdio_data = mdio_set,
106 .get_mdio_data = mdio_get,
107};
108
109static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
110 struct mdio_gpio_info *bitbang,
111 int bus_id)
112{
113 struct mdio_gpio_platform_data *pdata = dev_get_platdata(dev);
114 struct mii_bus *new_bus;
115
116 bitbang->ctrl.ops = &mdio_gpio_ops;
117
118 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
119 if (!new_bus)
120 return NULL;
121
122 new_bus->name = "GPIO Bitbanged MDIO";
123 new_bus->parent = dev;
124
125 if (bus_id != -1)
126 snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
127 else
128 strncpy(new_bus->id, "gpio", MII_BUS_ID_SIZE);
129
130 if (pdata) {
131 new_bus->phy_mask = pdata->phy_mask;
132 new_bus->phy_ignore_ta_mask = pdata->phy_ignore_ta_mask;
133 }
134
135 dev_set_drvdata(dev, new_bus);
136
137 return new_bus;
138}
139
140static void mdio_gpio_bus_deinit(struct device *dev)
141{
142 struct mii_bus *bus = dev_get_drvdata(dev);
143
144 free_mdio_bitbang(bus);
145}
146
147static void mdio_gpio_bus_destroy(struct device *dev)
148{
149 struct mii_bus *bus = dev_get_drvdata(dev);
150
151 mdiobus_unregister(bus);
152 mdio_gpio_bus_deinit(dev);
153}
154
155static int mdio_gpio_probe(struct platform_device *pdev)
156{
157 struct mdio_gpio_info *bitbang;
158 struct mii_bus *new_bus;
159 int ret, bus_id;
160
161 bitbang = devm_kzalloc(&pdev->dev, sizeof(*bitbang), GFP_KERNEL);
162 if (!bitbang)
163 return -ENOMEM;
164
165 ret = mdio_gpio_get_data(&pdev->dev, bitbang);
166 if (ret)
167 return ret;
168
169 if (pdev->dev.of_node) {
170 bus_id = of_alias_get_id(pdev->dev.of_node, "mdio-gpio");
171 if (bus_id < 0) {
172 dev_warn(&pdev->dev, "failed to get alias id\n");
173 bus_id = 0;
174 }
175 } else {
176 bus_id = pdev->id;
177 }
178
179 new_bus = mdio_gpio_bus_init(&pdev->dev, bitbang, bus_id);
180 if (!new_bus)
181 return -ENODEV;
182
183 ret = of_mdiobus_register(new_bus, pdev->dev.of_node);
184 if (ret)
185 mdio_gpio_bus_deinit(&pdev->dev);
186
187 return ret;
188}
189
190static int mdio_gpio_remove(struct platform_device *pdev)
191{
192 mdio_gpio_bus_destroy(&pdev->dev);
193
194 return 0;
195}
196
197static const struct of_device_id mdio_gpio_of_match[] = {
198 { .compatible = "virtual,mdio-gpio", },
199 { /* sentinel */ }
200};
201MODULE_DEVICE_TABLE(of, mdio_gpio_of_match);
202
203static struct platform_driver mdio_gpio_driver = {
204 .probe = mdio_gpio_probe,
205 .remove = mdio_gpio_remove,
206 .driver = {
207 .name = "mdio-gpio",
208 .of_match_table = mdio_gpio_of_match,
209 },
210};
211
212module_platform_driver(mdio_gpio_driver);
213
214MODULE_ALIAS("platform:mdio-gpio");
215MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
216MODULE_LICENSE("GPL v2");
217MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");