Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 1 | /* |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 2 | * GPIO based MDIO bitbang driver. |
| 3 | * Supports OpenFirmware. |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 4 | * |
| 5 | * Copyright (c) 2008 CSE Semaphore Belgium. |
| 6 | * by Laurent Pinchart <laurentp@cse-semaphore.com> |
| 7 | * |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 8 | * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt> |
| 9 | * |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 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> |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 27 | #include <linux/platform_device.h> |
| 28 | #include <linux/gpio.h> |
| 29 | #include <linux/mdio-gpio.h> |
| 30 | |
| 31 | #ifdef CONFIG_OF_GPIO |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 32 | #include <linux/of_gpio.h> |
| 33 | #include <linux/of_platform.h> |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 34 | #endif |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 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 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 52 | static int mdio_get(struct mdiobb_ctrl *ctrl) |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 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 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 60 | static void mdio_set(struct mdiobb_ctrl *ctrl, int what) |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 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 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 68 | static void mdc_set(struct mdiobb_ctrl *ctrl, int what) |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 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, |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 78 | .set_mdc = mdc_set, |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 79 | .set_mdio_dir = mdio_dir, |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 80 | .set_mdio_data = mdio_set, |
| 81 | .get_mdio_data = mdio_get, |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 82 | }; |
| 83 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 84 | static int __devinit mdio_gpio_bus_init(struct device *dev, |
| 85 | struct mdio_gpio_platform_data *pdata, |
| 86 | int bus_id) |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 87 | { |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 88 | struct mii_bus *new_bus; |
| 89 | struct mdio_gpio_info *bitbang; |
| 90 | int ret = -ENOMEM; |
| 91 | int i; |
| 92 | |
| 93 | bitbang = kzalloc(sizeof(*bitbang), GFP_KERNEL); |
| 94 | if (!bitbang) |
| 95 | goto out; |
| 96 | |
| 97 | bitbang->ctrl.ops = &mdio_gpio_ops; |
| 98 | bitbang->mdc = pdata->mdc; |
| 99 | bitbang->mdio = pdata->mdio; |
| 100 | |
| 101 | new_bus = alloc_mdio_bitbang(&bitbang->ctrl); |
| 102 | if (!new_bus) |
| 103 | goto out_free_bitbang; |
| 104 | |
| 105 | new_bus->name = "GPIO Bitbanged MDIO", |
| 106 | |
| 107 | ret = -ENODEV; |
| 108 | |
| 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) |
| 114 | goto out_free_bus; |
| 115 | |
| 116 | for (i = 0; i < PHY_MAX_ADDR; i++) |
| 117 | if (!new_bus->irq[i]) |
| 118 | new_bus->irq[i] = PHY_POLL; |
| 119 | |
| 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; |
| 124 | |
| 125 | if (gpio_request(bitbang->mdio, "mdio")) |
| 126 | goto out_free_mdc; |
| 127 | |
| 128 | dev_set_drvdata(dev, new_bus); |
| 129 | |
| 130 | ret = mdiobus_register(new_bus); |
| 131 | if (ret) |
| 132 | goto out_free_all; |
| 133 | |
| 134 | return 0; |
| 135 | |
| 136 | out_free_all: |
| 137 | dev_set_drvdata(dev, NULL); |
| 138 | gpio_free(bitbang->mdio); |
| 139 | out_free_mdc: |
| 140 | gpio_free(bitbang->mdc); |
| 141 | out_free_bus: |
| 142 | free_mdio_bitbang(new_bus); |
| 143 | out_free_bitbang: |
| 144 | kfree(bitbang); |
| 145 | out: |
| 146 | return ret; |
| 147 | } |
| 148 | |
| 149 | static void __devexit mdio_gpio_bus_destroy(struct device *dev) |
| 150 | { |
| 151 | struct mii_bus *bus = dev_get_drvdata(dev); |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 152 | struct mdio_gpio_info *bitbang = bus->priv; |
| 153 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 154 | mdiobus_unregister(bus); |
| 155 | free_mdio_bitbang(bus); |
| 156 | dev_set_drvdata(dev, NULL); |
| 157 | gpio_free(bitbang->mdc); |
| 158 | gpio_free(bitbang->mdio); |
| 159 | kfree(bitbang); |
| 160 | } |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 161 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 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) |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 167 | return -ENODEV; |
| 168 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 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 | |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 176 | return 0; |
| 177 | } |
| 178 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 179 | #ifdef CONFIG_OF_GPIO |
| 180 | static void __devinit add_phy(struct mdio_gpio_platform_data *pdata, |
| 181 | struct device_node *np) |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 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; |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 191 | pdata->phy_mask &= ~(1 << id); |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 192 | |
| 193 | irq = of_irq_to_resource(np, 0, NULL); |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 194 | if (irq) |
| 195 | pdata->irqs[id] = irq; |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 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; |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 202 | struct mdio_gpio_platform_data *pdata; |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 203 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 204 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); |
| 205 | if (!pdata) |
| 206 | return -ENOMEM; |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 207 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 208 | pdata->mdc = of_get_gpio(ofdev->node, 0); |
| 209 | pdata->mdio = of_get_gpio(ofdev->node, 1); |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 210 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 211 | if (pdata->mdc < 0 || pdata->mdio < 0) |
| 212 | goto out_free; |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 213 | |
| 214 | while ((np = of_get_next_child(ofdev->node, np))) |
| 215 | if (!strcmp(np->type, "ethernet-phy")) |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 216 | add_phy(pdata, np); |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 217 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 218 | return mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc); |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 219 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 220 | out_free: |
| 221 | kfree(pdata); |
| 222 | return -ENODEV; |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 223 | } |
| 224 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 225 | static int __devexit mdio_ofgpio_remove(struct of_device *ofdev) |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 226 | { |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 227 | mdio_gpio_bus_destroy(&ofdev->dev); |
| 228 | kfree(ofdev->dev.platform_data); |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 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, |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 244 | .remove = __devexit_p(mdio_ofgpio_remove), |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 245 | }; |
| 246 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 247 | static inline int __init mdio_ofgpio_init(void) |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 248 | { |
| 249 | return of_register_platform_driver(&mdio_ofgpio_driver); |
| 250 | } |
| 251 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 252 | static inline void __exit mdio_ofgpio_exit(void) |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 253 | { |
| 254 | of_unregister_platform_driver(&mdio_ofgpio_driver); |
| 255 | } |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 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 */ |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 260 | |
Paulius Zaleckas | f004f3e | 2008-11-14 00:24:34 +0000 | [diff] [blame^] | 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); |
| 292 | |
| 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"); |