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Linux/drivers/net/phy/mdio-gpio.c

  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 
 33 struct mdio_gpio_info {
 34         struct mdiobb_ctrl ctrl;
 35         int mdc, mdio, mdo;
 36         int mdc_active_low, mdio_active_low, mdo_active_low;
 37 };
 38 
 39 static void *mdio_gpio_of_get_data(struct platform_device *pdev)
 40 {
 41         struct device_node *np = pdev->dev.of_node;
 42         struct mdio_gpio_platform_data *pdata;
 43         enum of_gpio_flags flags;
 44         int ret;
 45 
 46         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 47         if (!pdata)
 48                 return NULL;
 49 
 50         ret = of_get_gpio_flags(np, 0, &flags);
 51         if (ret < 0)
 52                 return NULL;
 53 
 54         pdata->mdc = ret;
 55         pdata->mdc_active_low = flags & OF_GPIO_ACTIVE_LOW;
 56 
 57         ret = of_get_gpio_flags(np, 1, &flags);
 58         if (ret < 0)
 59                 return NULL;
 60         pdata->mdio = ret;
 61         pdata->mdio_active_low = flags & OF_GPIO_ACTIVE_LOW;
 62 
 63         ret = of_get_gpio_flags(np, 2, &flags);
 64         if (ret > 0) {
 65                 pdata->mdo = ret;
 66                 pdata->mdo_active_low = flags & OF_GPIO_ACTIVE_LOW;
 67         }
 68 
 69         return pdata;
 70 }
 71 
 72 static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
 73 {
 74         struct mdio_gpio_info *bitbang =
 75                 container_of(ctrl, struct mdio_gpio_info, ctrl);
 76 
 77         if (bitbang->mdo) {
 78                 /* Separate output pin. Always set its value to high
 79                  * when changing direction. If direction is input,
 80                  * assume the pin serves as pull-up. If direction is
 81                  * output, the default value is high.
 82                  */
 83                 gpio_set_value_cansleep(bitbang->mdo,
 84                                         1 ^ bitbang->mdo_active_low);
 85                 return;
 86         }
 87 
 88         if (dir)
 89                 gpio_direction_output(bitbang->mdio,
 90                                       1 ^ bitbang->mdio_active_low);
 91         else
 92                 gpio_direction_input(bitbang->mdio);
 93 }
 94 
 95 static int mdio_get(struct mdiobb_ctrl *ctrl)
 96 {
 97         struct mdio_gpio_info *bitbang =
 98                 container_of(ctrl, struct mdio_gpio_info, ctrl);
 99 
100         return gpio_get_value_cansleep(bitbang->mdio) ^
101                 bitbang->mdio_active_low;
102 }
103 
104 static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
105 {
106         struct mdio_gpio_info *bitbang =
107                 container_of(ctrl, struct mdio_gpio_info, ctrl);
108 
109         if (bitbang->mdo)
110                 gpio_set_value_cansleep(bitbang->mdo,
111                                         what ^ bitbang->mdo_active_low);
112         else
113                 gpio_set_value_cansleep(bitbang->mdio,
114                                         what ^ bitbang->mdio_active_low);
115 }
116 
117 static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
118 {
119         struct mdio_gpio_info *bitbang =
120                 container_of(ctrl, struct mdio_gpio_info, ctrl);
121 
122         gpio_set_value_cansleep(bitbang->mdc, what ^ bitbang->mdc_active_low);
123 }
124 
125 static struct mdiobb_ops mdio_gpio_ops = {
126         .owner = THIS_MODULE,
127         .set_mdc = mdc_set,
128         .set_mdio_dir = mdio_dir,
129         .set_mdio_data = mdio_set,
130         .get_mdio_data = mdio_get,
131 };
132 
133 static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
134                                           struct mdio_gpio_platform_data *pdata,
135                                           int bus_id)
136 {
137         struct mii_bus *new_bus;
138         struct mdio_gpio_info *bitbang;
139         int i;
140 
141         bitbang = devm_kzalloc(dev, sizeof(*bitbang), GFP_KERNEL);
142         if (!bitbang)
143                 goto out;
144 
145         bitbang->ctrl.ops = &mdio_gpio_ops;
146         bitbang->ctrl.reset = pdata->reset;
147         bitbang->mdc = pdata->mdc;
148         bitbang->mdc_active_low = pdata->mdc_active_low;
149         bitbang->mdio = pdata->mdio;
150         bitbang->mdio_active_low = pdata->mdio_active_low;
151         bitbang->mdo = pdata->mdo;
152         bitbang->mdo_active_low = pdata->mdo_active_low;
153 
154         new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
155         if (!new_bus)
156                 goto out;
157 
158         new_bus->name = "GPIO Bitbanged MDIO",
159 
160         new_bus->phy_mask = pdata->phy_mask;
161         new_bus->phy_ignore_ta_mask = pdata->phy_ignore_ta_mask;
162         memcpy(new_bus->irq, pdata->irqs, sizeof(new_bus->irq));
163         new_bus->parent = dev;
164 
165         if (new_bus->phy_mask == ~0)
166                 goto out_free_bus;
167 
168         for (i = 0; i < PHY_MAX_ADDR; i++)
169                 if (!new_bus->irq[i])
170                         new_bus->irq[i] = PHY_POLL;
171 
172         if (bus_id != -1)
173                 snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
174         else
175                 strncpy(new_bus->id, "gpio", MII_BUS_ID_SIZE);
176 
177         if (devm_gpio_request(dev, bitbang->mdc, "mdc"))
178                 goto out_free_bus;
179 
180         if (devm_gpio_request(dev, bitbang->mdio, "mdio"))
181                 goto out_free_bus;
182 
183         if (bitbang->mdo) {
184                 if (devm_gpio_request(dev, bitbang->mdo, "mdo"))
185                         goto out_free_bus;
186                 gpio_direction_output(bitbang->mdo, 1);
187                 gpio_direction_input(bitbang->mdio);
188         }
189 
190         gpio_direction_output(bitbang->mdc, 0);
191 
192         dev_set_drvdata(dev, new_bus);
193 
194         return new_bus;
195 
196 out_free_bus:
197         free_mdio_bitbang(new_bus);
198 out:
199         return NULL;
200 }
201 
202 static 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 
209 static 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 
217 static 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 
253 static int mdio_gpio_remove(struct platform_device *pdev)
254 {
255         mdio_gpio_bus_destroy(&pdev->dev);
256 
257         return 0;
258 }
259 
260 static const struct of_device_id mdio_gpio_of_match[] = {
261         { .compatible = "virtual,mdio-gpio", },
262         { /* sentinel */ }
263 };
264 MODULE_DEVICE_TABLE(of, mdio_gpio_of_match);
265 
266 static 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 
275 module_platform_driver(mdio_gpio_driver);
276 
277 MODULE_ALIAS("platform:mdio-gpio");
278 MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
279 MODULE_LICENSE("GPL");
280 MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");
281 

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