Commit | Line | Data |
---|---|---|
a5edeccb | 1 | /* |
f004f3ea PZ |
2 | * GPIO based MDIO bitbang driver. |
3 | * Supports OpenFirmware. | |
a5edeccb LP |
4 | * |
5 | * Copyright (c) 2008 CSE Semaphore Belgium. | |
6 | * by Laurent Pinchart <laurentp@cse-semaphore.com> | |
7 | * | |
f004f3ea PZ |
8 | * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt> |
9 | * | |
a5edeccb LP |
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> | |
f004f3ea PZ |
27 | #include <linux/platform_device.h> |
28 | #include <linux/gpio.h> | |
29 | #include <linux/mdio-gpio.h> | |
30 | ||
31 | #ifdef CONFIG_OF_GPIO | |
a5edeccb | 32 | #include <linux/of_gpio.h> |
dacac4da | 33 | #include <linux/of_mdio.h> |
a5edeccb | 34 | #include <linux/of_platform.h> |
f004f3ea | 35 | #endif |
a5edeccb LP |
36 | |
37 | struct mdio_gpio_info { | |
38 | struct mdiobb_ctrl ctrl; | |
39 | int mdc, mdio; | |
40 | }; | |
41 | ||
42 | static 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 | ||
f004f3ea | 53 | static int mdio_get(struct mdiobb_ctrl *ctrl) |
a5edeccb LP |
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 | ||
f004f3ea | 61 | static void mdio_set(struct mdiobb_ctrl *ctrl, int what) |
a5edeccb LP |
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 | ||
f004f3ea | 69 | static void mdc_set(struct mdiobb_ctrl *ctrl, int what) |
a5edeccb LP |
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 | ||
77 | static struct mdiobb_ops mdio_gpio_ops = { | |
78 | .owner = THIS_MODULE, | |
f004f3ea | 79 | .set_mdc = mdc_set, |
a5edeccb | 80 | .set_mdio_dir = mdio_dir, |
f004f3ea PZ |
81 | .set_mdio_data = mdio_set, |
82 | .get_mdio_data = mdio_get, | |
a5edeccb LP |
83 | }; |
84 | ||
dacac4da | 85 | static struct mii_bus * __devinit mdio_gpio_bus_init(struct device *dev, |
f004f3ea PZ |
86 | struct mdio_gpio_platform_data *pdata, |
87 | int bus_id) | |
a5edeccb | 88 | { |
a5edeccb LP |
89 | struct mii_bus *new_bus; |
90 | struct mdio_gpio_info *bitbang; | |
a5edeccb LP |
91 | int i; |
92 | ||
f004f3ea | 93 | bitbang = kzalloc(sizeof(*bitbang), GFP_KERNEL); |
a5edeccb LP |
94 | if (!bitbang) |
95 | goto out; | |
96 | ||
97 | bitbang->ctrl.ops = &mdio_gpio_ops; | |
f004f3ea PZ |
98 | bitbang->mdc = pdata->mdc; |
99 | bitbang->mdio = pdata->mdio; | |
a5edeccb LP |
100 | |
101 | new_bus = alloc_mdio_bitbang(&bitbang->ctrl); | |
102 | if (!new_bus) | |
298cf9be | 103 | goto out_free_bitbang; |
a5edeccb | 104 | |
f004f3ea | 105 | new_bus->name = "GPIO Bitbanged MDIO", |
a5edeccb | 106 | |
f004f3ea PZ |
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) | |
a5edeccb LP |
112 | goto out_free_bus; |
113 | ||
114 | for (i = 0; i < PHY_MAX_ADDR; i++) | |
f004f3ea PZ |
115 | if (!new_bus->irq[i]) |
116 | new_bus->irq[i] = PHY_POLL; | |
a5edeccb | 117 | |
f004f3ea PZ |
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; | |
a5edeccb | 122 | |
f004f3ea PZ |
123 | if (gpio_request(bitbang->mdio, "mdio")) |
124 | goto out_free_mdc; | |
125 | ||
664f93b4 PZ |
126 | gpio_direction_output(bitbang->mdc, 0); |
127 | ||
f004f3ea | 128 | dev_set_drvdata(dev, new_bus); |
a5edeccb | 129 | |
dacac4da | 130 | return new_bus; |
a5edeccb | 131 | |
f004f3ea PZ |
132 | out_free_mdc: |
133 | gpio_free(bitbang->mdc); | |
a5edeccb | 134 | out_free_bus: |
a5edeccb | 135 | free_mdio_bitbang(new_bus); |
298cf9be LB |
136 | out_free_bitbang: |
137 | kfree(bitbang); | |
a5edeccb | 138 | out: |
dacac4da | 139 | return NULL; |
a5edeccb LP |
140 | } |
141 | ||
dacac4da | 142 | static void __devinit mdio_gpio_bus_deinit(struct device *dev) |
a5edeccb | 143 | { |
f004f3ea | 144 | struct mii_bus *bus = dev_get_drvdata(dev); |
a5edeccb LP |
145 | struct mdio_gpio_info *bitbang = bus->priv; |
146 | ||
f004f3ea | 147 | dev_set_drvdata(dev, NULL); |
f004f3ea | 148 | gpio_free(bitbang->mdio); |
dacac4da MW |
149 | gpio_free(bitbang->mdc); |
150 | free_mdio_bitbang(bus); | |
a5edeccb | 151 | kfree(bitbang); |
f004f3ea PZ |
152 | } |
153 | ||
dacac4da MW |
154 | static 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 | ||
f004f3ea PZ |
162 | static int __devinit mdio_gpio_probe(struct platform_device *pdev) |
163 | { | |
164 | struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data; | |
dacac4da MW |
165 | struct mii_bus *new_bus; |
166 | int ret; | |
f004f3ea PZ |
167 | |
168 | if (!pdata) | |
169 | return -ENODEV; | |
170 | ||
dacac4da MW |
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; | |
f004f3ea PZ |
180 | } |
181 | ||
182 | static 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 | |
f004f3ea PZ |
190 | |
191 | static int __devinit mdio_ofgpio_probe(struct of_device *ofdev, | |
192 | const struct of_device_id *match) | |
193 | { | |
f004f3ea | 194 | struct mdio_gpio_platform_data *pdata; |
dacac4da | 195 | struct mii_bus *new_bus; |
57a57499 | 196 | int ret; |
f004f3ea PZ |
197 | |
198 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); | |
199 | if (!pdata) | |
200 | return -ENOMEM; | |
201 | ||
57a57499 RK |
202 | ret = of_get_gpio(ofdev->node, 0); |
203 | if (ret < 0) | |
f004f3ea | 204 | goto out_free; |
57a57499 RK |
205 | pdata->mdc = ret; |
206 | ||
207 | ret = of_get_gpio(ofdev->node, 1); | |
208 | if (ret < 0) | |
dacac4da | 209 | goto out_free; |
57a57499 | 210 | pdata->mdio = ret; |
f004f3ea | 211 | |
dacac4da MW |
212 | new_bus = mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc); |
213 | if (!new_bus) | |
a4b11649 | 214 | goto out_free; |
f004f3ea | 215 | |
dacac4da MW |
216 | ret = of_mdiobus_register(new_bus, ofdev->node); |
217 | if (ret) | |
218 | mdio_gpio_bus_deinit(&ofdev->dev); | |
219 | ||
220 | return ret; | |
f004f3ea PZ |
221 | |
222 | out_free: | |
223 | kfree(pdata); | |
224 | return -ENODEV; | |
225 | } | |
226 | ||
227 | static int __devexit mdio_ofgpio_remove(struct of_device *ofdev) | |
228 | { | |
229 | mdio_gpio_bus_destroy(&ofdev->dev); | |
230 | kfree(ofdev->dev.platform_data); | |
a5edeccb LP |
231 | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static struct of_device_id mdio_ofgpio_match[] = { | |
236 | { | |
237 | .compatible = "virtual,mdio-gpio", | |
238 | }, | |
239 | {}, | |
240 | }; | |
241 | ||
242 | static struct of_platform_driver mdio_ofgpio_driver = { | |
243 | .name = "mdio-gpio", | |
244 | .match_table = mdio_ofgpio_match, | |
245 | .probe = mdio_ofgpio_probe, | |
f004f3ea | 246 | .remove = __devexit_p(mdio_ofgpio_remove), |
a5edeccb LP |
247 | }; |
248 | ||
f004f3ea | 249 | static inline int __init mdio_ofgpio_init(void) |
a5edeccb LP |
250 | { |
251 | return of_register_platform_driver(&mdio_ofgpio_driver); | |
252 | } | |
253 | ||
f004f3ea | 254 | static inline void __exit mdio_ofgpio_exit(void) |
a5edeccb LP |
255 | { |
256 | of_unregister_platform_driver(&mdio_ofgpio_driver); | |
257 | } | |
f004f3ea PZ |
258 | #else |
259 | static inline int __init mdio_ofgpio_init(void) { return 0; } | |
260 | static inline void __exit mdio_ofgpio_exit(void) { } | |
261 | #endif /* CONFIG_OF_GPIO */ | |
262 | ||
263 | static struct platform_driver mdio_gpio_driver = { | |
264 | .probe = mdio_gpio_probe, | |
265 | .remove = __devexit_p(mdio_gpio_remove), | |
266 | .driver = { | |
267 | .name = "mdio-gpio", | |
268 | .owner = THIS_MODULE, | |
269 | }, | |
270 | }; | |
271 | ||
272 | static int __init mdio_gpio_init(void) | |
273 | { | |
274 | int ret; | |
275 | ||
276 | ret = mdio_ofgpio_init(); | |
277 | if (ret) | |
278 | return ret; | |
279 | ||
280 | ret = platform_driver_register(&mdio_gpio_driver); | |
281 | if (ret) | |
282 | mdio_ofgpio_exit(); | |
283 | ||
284 | return ret; | |
285 | } | |
286 | module_init(mdio_gpio_init); | |
287 | ||
288 | static void __exit mdio_gpio_exit(void) | |
289 | { | |
290 | platform_driver_unregister(&mdio_gpio_driver); | |
291 | mdio_ofgpio_exit(); | |
292 | } | |
293 | module_exit(mdio_gpio_exit); | |
a5edeccb | 294 | |
f004f3ea PZ |
295 | MODULE_ALIAS("platform:mdio-gpio"); |
296 | MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas"); | |
297 | MODULE_LICENSE("GPL"); | |
298 | MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO"); |