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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/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(bitbang->mdo, 1 ^ bitbang->mdo_active_low);
 84                 return;
 85         }
 86 
 87         if (dir)
 88                 gpio_direction_output(bitbang->mdio,
 89                                       1 ^ bitbang->mdio_active_low);
 90         else
 91                 gpio_direction_input(bitbang->mdio);
 92 }
 93 
 94 static int mdio_get(struct mdiobb_ctrl *ctrl)
 95 {
 96         struct mdio_gpio_info *bitbang =
 97                 container_of(ctrl, struct mdio_gpio_info, ctrl);
 98 
 99         return gpio_get_value(bitbang->mdio) ^ bitbang->mdio_active_low;
100 }
101 
102 static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
103 {
104         struct mdio_gpio_info *bitbang =
105                 container_of(ctrl, struct mdio_gpio_info, ctrl);
106 
107         if (bitbang->mdo)
108                 gpio_set_value(bitbang->mdo, what ^ bitbang->mdo_active_low);
109         else
110                 gpio_set_value(bitbang->mdio, what ^ bitbang->mdio_active_low);
111 }
112 
113 static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
114 {
115         struct mdio_gpio_info *bitbang =
116                 container_of(ctrl, struct mdio_gpio_info, ctrl);
117 
118         gpio_set_value(bitbang->mdc, what ^ bitbang->mdc_active_low);
119 }
120 
121 static struct mdiobb_ops mdio_gpio_ops = {
122         .owner = THIS_MODULE,
123         .set_mdc = mdc_set,
124         .set_mdio_dir = mdio_dir,
125         .set_mdio_data = mdio_set,
126         .get_mdio_data = mdio_get,
127 };
128 
129 static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
130                                           struct mdio_gpio_platform_data *pdata,
131                                           int bus_id)
132 {
133         struct mii_bus *new_bus;
134         struct mdio_gpio_info *bitbang;
135         int i;
136 
137         bitbang = devm_kzalloc(dev, sizeof(*bitbang), GFP_KERNEL);
138         if (!bitbang)
139                 goto out;
140 
141         bitbang->ctrl.ops = &mdio_gpio_ops;
142         bitbang->ctrl.reset = pdata->reset;
143         bitbang->mdc = pdata->mdc;
144         bitbang->mdc_active_low = pdata->mdc_active_low;
145         bitbang->mdio = pdata->mdio;
146         bitbang->mdio_active_low = pdata->mdio_active_low;
147         bitbang->mdo = pdata->mdo;
148         bitbang->mdo_active_low = pdata->mdo_active_low;
149 
150         new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
151         if (!new_bus)
152                 goto out;
153 
154         new_bus->name = "GPIO Bitbanged MDIO",
155 
156         new_bus->phy_mask = pdata->phy_mask;
157         new_bus->irq = pdata->irqs;
158         new_bus->parent = dev;
159 
160         if (new_bus->phy_mask == ~0)
161                 goto out_free_bus;
162 
163         for (i = 0; i < PHY_MAX_ADDR; i++)
164                 if (!new_bus->irq[i])
165                         new_bus->irq[i] = PHY_POLL;
166 
167         snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
168 
169         if (devm_gpio_request(dev, bitbang->mdc, "mdc"))
170                 goto out_free_bus;
171 
172         if (devm_gpio_request(dev, bitbang->mdio, "mdio"))
173                 goto out_free_bus;
174 
175         if (bitbang->mdo) {
176                 if (devm_gpio_request(dev, bitbang->mdo, "mdo"))
177                         goto out_free_bus;
178                 gpio_direction_output(bitbang->mdo, 1);
179                 gpio_direction_input(bitbang->mdio);
180         }
181 
182         gpio_direction_output(bitbang->mdc, 0);
183 
184         dev_set_drvdata(dev, new_bus);
185 
186         return new_bus;
187 
188 out_free_bus:
189         free_mdio_bitbang(new_bus);
190 out:
191         return NULL;
192 }
193 
194 static void mdio_gpio_bus_deinit(struct device *dev)
195 {
196         struct mii_bus *bus = dev_get_drvdata(dev);
197 
198         free_mdio_bitbang(bus);
199 }
200 
201 static void mdio_gpio_bus_destroy(struct device *dev)
202 {
203         struct mii_bus *bus = dev_get_drvdata(dev);
204 
205         mdiobus_unregister(bus);
206         mdio_gpio_bus_deinit(dev);
207 }
208 
209 static int mdio_gpio_probe(struct platform_device *pdev)
210 {
211         struct mdio_gpio_platform_data *pdata;
212         struct mii_bus *new_bus;
213         int ret, bus_id;
214 
215         if (pdev->dev.of_node) {
216                 pdata = mdio_gpio_of_get_data(pdev);
217                 bus_id = of_alias_get_id(pdev->dev.of_node, "mdio-gpio");
218                 if (bus_id < 0) {
219                         dev_warn(&pdev->dev, "failed to get alias id\n");
220                         bus_id = 0;
221                 }
222         } else {
223                 pdata = dev_get_platdata(&pdev->dev);
224                 bus_id = pdev->id;
225         }
226 
227         if (!pdata)
228                 return -ENODEV;
229 
230         new_bus = mdio_gpio_bus_init(&pdev->dev, pdata, bus_id);
231         if (!new_bus)
232                 return -ENODEV;
233 
234         if (pdev->dev.of_node)
235                 ret = of_mdiobus_register(new_bus, pdev->dev.of_node);
236         else
237                 ret = mdiobus_register(new_bus);
238 
239         if (ret)
240                 mdio_gpio_bus_deinit(&pdev->dev);
241 
242         return ret;
243 }
244 
245 static int mdio_gpio_remove(struct platform_device *pdev)
246 {
247         mdio_gpio_bus_destroy(&pdev->dev);
248 
249         return 0;
250 }
251 
252 static struct of_device_id mdio_gpio_of_match[] = {
253         { .compatible = "virtual,mdio-gpio", },
254         { /* sentinel */ }
255 };
256 
257 static struct platform_driver mdio_gpio_driver = {
258         .probe = mdio_gpio_probe,
259         .remove = mdio_gpio_remove,
260         .driver         = {
261                 .name   = "mdio-gpio",
262                 .owner  = THIS_MODULE,
263                 .of_match_table = mdio_gpio_of_match,
264         },
265 };
266 
267 module_platform_driver(mdio_gpio_driver);
268 
269 MODULE_ALIAS("platform:mdio-gpio");
270 MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
271 MODULE_LICENSE("GPL");
272 MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");
273 

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