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 LP |
32 | #include <linux/of_gpio.h> |
33 | #include <linux/of_platform.h> | |
f004f3ea | 34 | #endif |
a5edeccb LP |
35 | |
36 | struct mdio_gpio_info { | |
37 | struct mdiobb_ctrl ctrl; | |
38 | int mdc, mdio; | |
39 | }; | |
40 | ||
41 | static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir) | |
42 | { | |
43 | struct mdio_gpio_info *bitbang = | |
44 | container_of(ctrl, struct mdio_gpio_info, ctrl); | |
45 | ||
46 | if (dir) | |
47 | gpio_direction_output(bitbang->mdio, 1); | |
48 | else | |
49 | gpio_direction_input(bitbang->mdio); | |
50 | } | |
51 | ||
f004f3ea | 52 | static int mdio_get(struct mdiobb_ctrl *ctrl) |
a5edeccb LP |
53 | { |
54 | struct mdio_gpio_info *bitbang = | |
55 | container_of(ctrl, struct mdio_gpio_info, ctrl); | |
56 | ||
57 | return gpio_get_value(bitbang->mdio); | |
58 | } | |
59 | ||
f004f3ea | 60 | static void mdio_set(struct mdiobb_ctrl *ctrl, int what) |
a5edeccb LP |
61 | { |
62 | struct mdio_gpio_info *bitbang = | |
63 | container_of(ctrl, struct mdio_gpio_info, ctrl); | |
64 | ||
65 | gpio_set_value(bitbang->mdio, what); | |
66 | } | |
67 | ||
f004f3ea | 68 | static void mdc_set(struct mdiobb_ctrl *ctrl, int what) |
a5edeccb LP |
69 | { |
70 | struct mdio_gpio_info *bitbang = | |
71 | container_of(ctrl, struct mdio_gpio_info, ctrl); | |
72 | ||
73 | gpio_set_value(bitbang->mdc, what); | |
74 | } | |
75 | ||
76 | static struct mdiobb_ops mdio_gpio_ops = { | |
77 | .owner = THIS_MODULE, | |
f004f3ea | 78 | .set_mdc = mdc_set, |
a5edeccb | 79 | .set_mdio_dir = mdio_dir, |
f004f3ea PZ |
80 | .set_mdio_data = mdio_set, |
81 | .get_mdio_data = mdio_get, | |
a5edeccb LP |
82 | }; |
83 | ||
f004f3ea PZ |
84 | static int __devinit mdio_gpio_bus_init(struct device *dev, |
85 | struct mdio_gpio_platform_data *pdata, | |
86 | int bus_id) | |
a5edeccb | 87 | { |
a5edeccb LP |
88 | struct mii_bus *new_bus; |
89 | struct mdio_gpio_info *bitbang; | |
90 | int ret = -ENOMEM; | |
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 | 107 | ret = -ENODEV; |
a5edeccb | 108 | |
f004f3ea PZ |
109 | new_bus->phy_mask = pdata->phy_mask; |
110 | new_bus->irq = pdata->irqs; | |
111 | new_bus->parent = dev; | |
112 | ||
113 | if (new_bus->phy_mask == ~0) | |
a5edeccb LP |
114 | goto out_free_bus; |
115 | ||
116 | for (i = 0; i < PHY_MAX_ADDR; i++) | |
f004f3ea PZ |
117 | if (!new_bus->irq[i]) |
118 | new_bus->irq[i] = PHY_POLL; | |
a5edeccb | 119 | |
f004f3ea PZ |
120 | snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", bus_id); |
121 | ||
122 | if (gpio_request(bitbang->mdc, "mdc")) | |
123 | goto out_free_bus; | |
a5edeccb | 124 | |
f004f3ea PZ |
125 | if (gpio_request(bitbang->mdio, "mdio")) |
126 | goto out_free_mdc; | |
127 | ||
128 | dev_set_drvdata(dev, new_bus); | |
a5edeccb LP |
129 | |
130 | ret = mdiobus_register(new_bus); | |
131 | if (ret) | |
f004f3ea | 132 | goto out_free_all; |
a5edeccb LP |
133 | |
134 | return 0; | |
135 | ||
f004f3ea PZ |
136 | out_free_all: |
137 | dev_set_drvdata(dev, NULL); | |
138 | gpio_free(bitbang->mdio); | |
139 | out_free_mdc: | |
140 | gpio_free(bitbang->mdc); | |
a5edeccb | 141 | out_free_bus: |
a5edeccb | 142 | free_mdio_bitbang(new_bus); |
298cf9be LB |
143 | out_free_bitbang: |
144 | kfree(bitbang); | |
a5edeccb LP |
145 | out: |
146 | return ret; | |
147 | } | |
148 | ||
f004f3ea | 149 | static void __devexit mdio_gpio_bus_destroy(struct device *dev) |
a5edeccb | 150 | { |
f004f3ea | 151 | struct mii_bus *bus = dev_get_drvdata(dev); |
a5edeccb LP |
152 | struct mdio_gpio_info *bitbang = bus->priv; |
153 | ||
154 | mdiobus_unregister(bus); | |
155 | free_mdio_bitbang(bus); | |
f004f3ea PZ |
156 | dev_set_drvdata(dev, NULL); |
157 | gpio_free(bitbang->mdc); | |
158 | gpio_free(bitbang->mdio); | |
a5edeccb | 159 | kfree(bitbang); |
f004f3ea PZ |
160 | } |
161 | ||
162 | static int __devinit mdio_gpio_probe(struct platform_device *pdev) | |
163 | { | |
164 | struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data; | |
165 | ||
166 | if (!pdata) | |
167 | return -ENODEV; | |
168 | ||
169 | return mdio_gpio_bus_init(&pdev->dev, pdata, pdev->id); | |
170 | } | |
171 | ||
172 | static int __devexit mdio_gpio_remove(struct platform_device *pdev) | |
173 | { | |
174 | mdio_gpio_bus_destroy(&pdev->dev); | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | #ifdef CONFIG_OF_GPIO | |
180 | static void __devinit add_phy(struct mdio_gpio_platform_data *pdata, | |
181 | struct device_node *np) | |
182 | { | |
183 | const u32 *data; | |
184 | int len, id, irq; | |
185 | ||
186 | data = of_get_property(np, "reg", &len); | |
187 | if (!data || len != 4) | |
188 | return; | |
189 | ||
190 | id = *data; | |
191 | pdata->phy_mask &= ~(1 << id); | |
192 | ||
193 | irq = of_irq_to_resource(np, 0, NULL); | |
194 | if (irq) | |
195 | pdata->irqs[id] = irq; | |
196 | } | |
197 | ||
198 | static int __devinit mdio_ofgpio_probe(struct of_device *ofdev, | |
199 | const struct of_device_id *match) | |
200 | { | |
201 | struct device_node *np = NULL; | |
202 | struct mdio_gpio_platform_data *pdata; | |
203 | ||
204 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); | |
205 | if (!pdata) | |
206 | return -ENOMEM; | |
207 | ||
208 | pdata->mdc = of_get_gpio(ofdev->node, 0); | |
209 | pdata->mdio = of_get_gpio(ofdev->node, 1); | |
210 | ||
211 | if (pdata->mdc < 0 || pdata->mdio < 0) | |
212 | goto out_free; | |
213 | ||
214 | while ((np = of_get_next_child(ofdev->node, np))) | |
215 | if (!strcmp(np->type, "ethernet-phy")) | |
216 | add_phy(pdata, np); | |
217 | ||
218 | return mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc); | |
219 | ||
220 | out_free: | |
221 | kfree(pdata); | |
222 | return -ENODEV; | |
223 | } | |
224 | ||
225 | static int __devexit mdio_ofgpio_remove(struct of_device *ofdev) | |
226 | { | |
227 | mdio_gpio_bus_destroy(&ofdev->dev); | |
228 | kfree(ofdev->dev.platform_data); | |
a5edeccb LP |
229 | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static struct of_device_id mdio_ofgpio_match[] = { | |
234 | { | |
235 | .compatible = "virtual,mdio-gpio", | |
236 | }, | |
237 | {}, | |
238 | }; | |
239 | ||
240 | static struct of_platform_driver mdio_ofgpio_driver = { | |
241 | .name = "mdio-gpio", | |
242 | .match_table = mdio_ofgpio_match, | |
243 | .probe = mdio_ofgpio_probe, | |
f004f3ea | 244 | .remove = __devexit_p(mdio_ofgpio_remove), |
a5edeccb LP |
245 | }; |
246 | ||
f004f3ea | 247 | static inline int __init mdio_ofgpio_init(void) |
a5edeccb LP |
248 | { |
249 | return of_register_platform_driver(&mdio_ofgpio_driver); | |
250 | } | |
251 | ||
f004f3ea | 252 | static inline void __exit mdio_ofgpio_exit(void) |
a5edeccb LP |
253 | { |
254 | of_unregister_platform_driver(&mdio_ofgpio_driver); | |
255 | } | |
f004f3ea PZ |
256 | #else |
257 | static inline int __init mdio_ofgpio_init(void) { return 0; } | |
258 | static inline void __exit mdio_ofgpio_exit(void) { } | |
259 | #endif /* CONFIG_OF_GPIO */ | |
260 | ||
261 | static struct platform_driver mdio_gpio_driver = { | |
262 | .probe = mdio_gpio_probe, | |
263 | .remove = __devexit_p(mdio_gpio_remove), | |
264 | .driver = { | |
265 | .name = "mdio-gpio", | |
266 | .owner = THIS_MODULE, | |
267 | }, | |
268 | }; | |
269 | ||
270 | static int __init mdio_gpio_init(void) | |
271 | { | |
272 | int ret; | |
273 | ||
274 | ret = mdio_ofgpio_init(); | |
275 | if (ret) | |
276 | return ret; | |
277 | ||
278 | ret = platform_driver_register(&mdio_gpio_driver); | |
279 | if (ret) | |
280 | mdio_ofgpio_exit(); | |
281 | ||
282 | return ret; | |
283 | } | |
284 | module_init(mdio_gpio_init); | |
285 | ||
286 | static void __exit mdio_gpio_exit(void) | |
287 | { | |
288 | platform_driver_unregister(&mdio_gpio_driver); | |
289 | mdio_ofgpio_exit(); | |
290 | } | |
291 | module_exit(mdio_gpio_exit); | |
a5edeccb | 292 | |
f004f3ea PZ |
293 | MODULE_ALIAS("platform:mdio-gpio"); |
294 | MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas"); | |
295 | MODULE_LICENSE("GPL"); | |
296 | MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO"); |