]>
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> | |
a5edeccb | 25 | #include <linux/interrupt.h> |
f004f3ea | 26 | #include <linux/platform_device.h> |
fb78a95e AL |
27 | #include <linux/mdio-bitbang.h> |
28 | #include <linux/mdio-gpio.h> | |
f004f3ea | 29 | #include <linux/gpio.h> |
0207dd11 | 30 | #include <linux/gpio/consumer.h> |
f004f3ea | 31 | |
a5edeccb | 32 | #include <linux/of_gpio.h> |
dacac4da | 33 | #include <linux/of_mdio.h> |
a5edeccb LP |
34 | |
35 | struct mdio_gpio_info { | |
36 | struct mdiobb_ctrl ctrl; | |
7e5fbd1e | 37 | struct gpio_desc *mdc, *mdio, *mdo; |
a5edeccb LP |
38 | }; |
39 | ||
4029ea3a AL |
40 | static int mdio_gpio_get_data(struct device *dev, |
41 | struct mdio_gpio_info *bitbang) | |
e92bdf4b | 42 | { |
fb78a95e AL |
43 | bitbang->mdc = devm_gpiod_get_index(dev, NULL, MDIO_GPIO_MDC, |
44 | GPIOD_OUT_LOW); | |
4029ea3a AL |
45 | if (IS_ERR(bitbang->mdc)) |
46 | return PTR_ERR(bitbang->mdc); | |
e92bdf4b | 47 | |
fb78a95e AL |
48 | bitbang->mdio = devm_gpiod_get_index(dev, NULL, MDIO_GPIO_MDIO, |
49 | GPIOD_IN); | |
4029ea3a AL |
50 | if (IS_ERR(bitbang->mdio)) |
51 | return PTR_ERR(bitbang->mdio); | |
f1d54c47 | 52 | |
fb78a95e | 53 | bitbang->mdo = devm_gpiod_get_index_optional(dev, NULL, MDIO_GPIO_MDO, |
4029ea3a AL |
54 | GPIOD_OUT_LOW); |
55 | return PTR_ERR_OR_ZERO(bitbang->mdo); | |
e92bdf4b SK |
56 | } |
57 | ||
a5edeccb LP |
58 | static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir) |
59 | { | |
60 | struct mdio_gpio_info *bitbang = | |
61 | container_of(ctrl, struct mdio_gpio_info, ctrl); | |
62 | ||
f1d54c47 GR |
63 | if (bitbang->mdo) { |
64 | /* Separate output pin. Always set its value to high | |
65 | * when changing direction. If direction is input, | |
66 | * assume the pin serves as pull-up. If direction is | |
67 | * output, the default value is high. | |
68 | */ | |
52aab18e | 69 | gpiod_set_value(bitbang->mdo, 1); |
f1d54c47 GR |
70 | return; |
71 | } | |
72 | ||
a5edeccb | 73 | if (dir) |
52aab18e | 74 | gpiod_direction_output(bitbang->mdio, 1); |
a5edeccb | 75 | else |
7e5fbd1e | 76 | gpiod_direction_input(bitbang->mdio); |
a5edeccb LP |
77 | } |
78 | ||
f004f3ea | 79 | static int mdio_get(struct mdiobb_ctrl *ctrl) |
a5edeccb LP |
80 | { |
81 | struct mdio_gpio_info *bitbang = | |
82 | container_of(ctrl, struct mdio_gpio_info, ctrl); | |
83 | ||
52aab18e | 84 | return gpiod_get_value(bitbang->mdio); |
a5edeccb LP |
85 | } |
86 | ||
f004f3ea | 87 | static void mdio_set(struct mdiobb_ctrl *ctrl, int what) |
a5edeccb LP |
88 | { |
89 | struct mdio_gpio_info *bitbang = | |
90 | container_of(ctrl, struct mdio_gpio_info, ctrl); | |
91 | ||
f1d54c47 | 92 | if (bitbang->mdo) |
52aab18e | 93 | gpiod_set_value(bitbang->mdo, what); |
f1d54c47 | 94 | else |
52aab18e | 95 | gpiod_set_value(bitbang->mdio, what); |
a5edeccb LP |
96 | } |
97 | ||
f004f3ea | 98 | static void mdc_set(struct mdiobb_ctrl *ctrl, int what) |
a5edeccb LP |
99 | { |
100 | struct mdio_gpio_info *bitbang = | |
101 | container_of(ctrl, struct mdio_gpio_info, ctrl); | |
102 | ||
52aab18e | 103 | gpiod_set_value(bitbang->mdc, what); |
a5edeccb LP |
104 | } |
105 | ||
41a130f7 | 106 | static const struct mdiobb_ops mdio_gpio_ops = { |
a5edeccb | 107 | .owner = THIS_MODULE, |
f004f3ea | 108 | .set_mdc = mdc_set, |
a5edeccb | 109 | .set_mdio_dir = mdio_dir, |
f004f3ea PZ |
110 | .set_mdio_data = mdio_set, |
111 | .get_mdio_data = mdio_get, | |
a5edeccb LP |
112 | }; |
113 | ||
633d1594 | 114 | static struct mii_bus *mdio_gpio_bus_init(struct device *dev, |
fb766421 | 115 | struct mdio_gpio_info *bitbang, |
1dd06ae8 | 116 | int bus_id) |
a5edeccb | 117 | { |
a5edeccb | 118 | struct mii_bus *new_bus; |
a5edeccb LP |
119 | |
120 | bitbang->ctrl.ops = &mdio_gpio_ops; | |
121 | ||
122 | new_bus = alloc_mdio_bitbang(&bitbang->ctrl); | |
123 | if (!new_bus) | |
c82fc481 | 124 | return NULL; |
a5edeccb | 125 | |
712e5a5c | 126 | new_bus->name = "GPIO Bitbanged MDIO"; |
f004f3ea PZ |
127 | new_bus->parent = dev; |
128 | ||
7c0c8268 BV |
129 | if (bus_id != -1) |
130 | snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id); | |
131 | else | |
132 | strncpy(new_bus->id, "gpio", MII_BUS_ID_SIZE); | |
f004f3ea | 133 | |
f004f3ea | 134 | dev_set_drvdata(dev, new_bus); |
a5edeccb | 135 | |
dacac4da | 136 | return new_bus; |
a5edeccb LP |
137 | } |
138 | ||
f99b4a02 | 139 | static void mdio_gpio_bus_deinit(struct device *dev) |
a5edeccb | 140 | { |
f004f3ea | 141 | struct mii_bus *bus = dev_get_drvdata(dev); |
a5edeccb | 142 | |
dacac4da | 143 | free_mdio_bitbang(bus); |
f004f3ea PZ |
144 | } |
145 | ||
633d1594 | 146 | static void mdio_gpio_bus_destroy(struct device *dev) |
dacac4da MW |
147 | { |
148 | struct mii_bus *bus = dev_get_drvdata(dev); | |
149 | ||
150 | mdiobus_unregister(bus); | |
151 | mdio_gpio_bus_deinit(dev); | |
152 | } | |
153 | ||
633d1594 | 154 | static int mdio_gpio_probe(struct platform_device *pdev) |
f004f3ea | 155 | { |
fb766421 | 156 | struct mdio_gpio_info *bitbang; |
dacac4da | 157 | struct mii_bus *new_bus; |
3272dd9b | 158 | int ret, bus_id; |
f004f3ea | 159 | |
fb766421 AL |
160 | bitbang = devm_kzalloc(&pdev->dev, sizeof(*bitbang), GFP_KERNEL); |
161 | if (!bitbang) | |
162 | return -ENOMEM; | |
163 | ||
4029ea3a AL |
164 | ret = mdio_gpio_get_data(&pdev->dev, bitbang); |
165 | if (ret) | |
166 | return ret; | |
167 | ||
3272dd9b | 168 | if (pdev->dev.of_node) { |
3272dd9b | 169 | bus_id = of_alias_get_id(pdev->dev.of_node, "mdio-gpio"); |
7f52da56 JH |
170 | if (bus_id < 0) { |
171 | dev_warn(&pdev->dev, "failed to get alias id\n"); | |
172 | bus_id = 0; | |
173 | } | |
3272dd9b | 174 | } else { |
3272dd9b SK |
175 | bus_id = pdev->id; |
176 | } | |
e92bdf4b | 177 | |
4029ea3a | 178 | new_bus = mdio_gpio_bus_init(&pdev->dev, bitbang, bus_id); |
dacac4da MW |
179 | if (!new_bus) |
180 | return -ENODEV; | |
181 | ||
00e798c7 | 182 | ret = of_mdiobus_register(new_bus, pdev->dev.of_node); |
dacac4da MW |
183 | if (ret) |
184 | mdio_gpio_bus_deinit(&pdev->dev); | |
185 | ||
186 | return ret; | |
f004f3ea PZ |
187 | } |
188 | ||
633d1594 | 189 | static int mdio_gpio_remove(struct platform_device *pdev) |
f004f3ea PZ |
190 | { |
191 | mdio_gpio_bus_destroy(&pdev->dev); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
d8a7dadb | 196 | static const struct of_device_id mdio_gpio_of_match[] = { |
e92bdf4b SK |
197 | { .compatible = "virtual,mdio-gpio", }, |
198 | { /* sentinel */ } | |
a5edeccb | 199 | }; |
1ccb141e | 200 | MODULE_DEVICE_TABLE(of, mdio_gpio_of_match); |
a5edeccb | 201 | |
f004f3ea PZ |
202 | static struct platform_driver mdio_gpio_driver = { |
203 | .probe = mdio_gpio_probe, | |
633d1594 | 204 | .remove = mdio_gpio_remove, |
f004f3ea PZ |
205 | .driver = { |
206 | .name = "mdio-gpio", | |
e92bdf4b | 207 | .of_match_table = mdio_gpio_of_match, |
f004f3ea PZ |
208 | }, |
209 | }; | |
210 | ||
f8e5fc8c | 211 | module_platform_driver(mdio_gpio_driver); |
a5edeccb | 212 | |
f004f3ea PZ |
213 | MODULE_ALIAS("platform:mdio-gpio"); |
214 | MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas"); | |
215 | MODULE_LICENSE("GPL"); | |
216 | MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO"); |