Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 1 | /* |
| 2 | * OpenFirmware GPIO based MDIO bitbang driver. |
| 3 | * |
| 4 | * Copyright (c) 2008 CSE Semaphore Belgium. |
| 5 | * by Laurent Pinchart <laurentp@cse-semaphore.com> |
| 6 | * |
| 7 | * Based on earlier work by |
| 8 | * |
| 9 | * Copyright (c) 2003 Intracom S.A. |
| 10 | * by Pantelis Antoniou <panto@intracom.gr> |
| 11 | * |
| 12 | * 2005 (c) MontaVista Software, Inc. |
| 13 | * Vitaly Bordug <vbordug@ru.mvista.com> |
| 14 | * |
| 15 | * This file is licensed under the terms of the GNU General Public License |
| 16 | * version 2. This program is licensed "as is" without any warranty of any |
| 17 | * kind, whether express or implied. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/mdio-bitbang.h> |
| 25 | #include <linux/of_gpio.h> |
| 26 | #include <linux/of_platform.h> |
| 27 | |
| 28 | struct mdio_gpio_info { |
| 29 | struct mdiobb_ctrl ctrl; |
| 30 | int mdc, mdio; |
| 31 | }; |
| 32 | |
| 33 | static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir) |
| 34 | { |
| 35 | struct mdio_gpio_info *bitbang = |
| 36 | container_of(ctrl, struct mdio_gpio_info, ctrl); |
| 37 | |
| 38 | if (dir) |
| 39 | gpio_direction_output(bitbang->mdio, 1); |
| 40 | else |
| 41 | gpio_direction_input(bitbang->mdio); |
| 42 | } |
| 43 | |
| 44 | static int mdio_read(struct mdiobb_ctrl *ctrl) |
| 45 | { |
| 46 | struct mdio_gpio_info *bitbang = |
| 47 | container_of(ctrl, struct mdio_gpio_info, ctrl); |
| 48 | |
| 49 | return gpio_get_value(bitbang->mdio); |
| 50 | } |
| 51 | |
| 52 | static void mdio(struct mdiobb_ctrl *ctrl, int what) |
| 53 | { |
| 54 | struct mdio_gpio_info *bitbang = |
| 55 | container_of(ctrl, struct mdio_gpio_info, ctrl); |
| 56 | |
| 57 | gpio_set_value(bitbang->mdio, what); |
| 58 | } |
| 59 | |
| 60 | static void mdc(struct mdiobb_ctrl *ctrl, int what) |
| 61 | { |
| 62 | struct mdio_gpio_info *bitbang = |
| 63 | container_of(ctrl, struct mdio_gpio_info, ctrl); |
| 64 | |
| 65 | gpio_set_value(bitbang->mdc, what); |
| 66 | } |
| 67 | |
| 68 | static struct mdiobb_ops mdio_gpio_ops = { |
| 69 | .owner = THIS_MODULE, |
| 70 | .set_mdc = mdc, |
| 71 | .set_mdio_dir = mdio_dir, |
| 72 | .set_mdio_data = mdio, |
| 73 | .get_mdio_data = mdio_read, |
| 74 | }; |
| 75 | |
| 76 | static int __devinit mdio_ofgpio_bitbang_init(struct mii_bus *bus, |
| 77 | struct device_node *np) |
| 78 | { |
| 79 | struct mdio_gpio_info *bitbang = bus->priv; |
| 80 | |
| 81 | bitbang->mdc = of_get_gpio(np, 0); |
| 82 | bitbang->mdio = of_get_gpio(np, 1); |
| 83 | |
| 84 | if (bitbang->mdc < 0 || bitbang->mdio < 0) |
| 85 | return -ENODEV; |
| 86 | |
| 87 | snprintf(bus->id, MII_BUS_ID_SIZE, "%x", bitbang->mdc); |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | static void __devinit add_phy(struct mii_bus *bus, struct device_node *np) |
| 92 | { |
| 93 | const u32 *data; |
| 94 | int len, id, irq; |
| 95 | |
| 96 | data = of_get_property(np, "reg", &len); |
| 97 | if (!data || len != 4) |
| 98 | return; |
| 99 | |
| 100 | id = *data; |
| 101 | bus->phy_mask &= ~(1 << id); |
| 102 | |
| 103 | irq = of_irq_to_resource(np, 0, NULL); |
| 104 | if (irq != NO_IRQ) |
| 105 | bus->irq[id] = irq; |
| 106 | } |
| 107 | |
| 108 | static int __devinit mdio_ofgpio_probe(struct of_device *ofdev, |
| 109 | const struct of_device_id *match) |
| 110 | { |
| 111 | struct device_node *np = NULL; |
| 112 | struct mii_bus *new_bus; |
| 113 | struct mdio_gpio_info *bitbang; |
| 114 | int ret = -ENOMEM; |
| 115 | int i; |
| 116 | |
| 117 | bitbang = kzalloc(sizeof(struct mdio_gpio_info), GFP_KERNEL); |
| 118 | if (!bitbang) |
| 119 | goto out; |
| 120 | |
| 121 | bitbang->ctrl.ops = &mdio_gpio_ops; |
| 122 | |
| 123 | new_bus = alloc_mdio_bitbang(&bitbang->ctrl); |
| 124 | if (!new_bus) |
Lennert Buytenhek | 298cf9be | 2008-10-08 16:29:57 -0700 | [diff] [blame^] | 125 | goto out_free_bitbang; |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 126 | |
| 127 | new_bus->name = "GPIO Bitbanged MII", |
| 128 | |
| 129 | ret = mdio_ofgpio_bitbang_init(new_bus, ofdev->node); |
| 130 | if (ret) |
| 131 | goto out_free_bus; |
| 132 | |
| 133 | new_bus->phy_mask = ~0; |
| 134 | new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL); |
| 135 | if (!new_bus->irq) |
| 136 | goto out_free_bus; |
| 137 | |
| 138 | for (i = 0; i < PHY_MAX_ADDR; i++) |
| 139 | new_bus->irq[i] = -1; |
| 140 | |
| 141 | while ((np = of_get_next_child(ofdev->node, np))) |
| 142 | if (!strcmp(np->type, "ethernet-phy")) |
| 143 | add_phy(new_bus, np); |
| 144 | |
Lennert Buytenhek | 18ee49d | 2008-10-01 15:41:33 +0000 | [diff] [blame] | 145 | new_bus->parent = &ofdev->dev; |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 146 | dev_set_drvdata(&ofdev->dev, new_bus); |
| 147 | |
| 148 | ret = mdiobus_register(new_bus); |
| 149 | if (ret) |
| 150 | goto out_free_irqs; |
| 151 | |
| 152 | return 0; |
| 153 | |
| 154 | out_free_irqs: |
| 155 | dev_set_drvdata(&ofdev->dev, NULL); |
| 156 | kfree(new_bus->irq); |
| 157 | out_free_bus: |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 158 | free_mdio_bitbang(new_bus); |
Lennert Buytenhek | 298cf9be | 2008-10-08 16:29:57 -0700 | [diff] [blame^] | 159 | out_free_bitbang: |
| 160 | kfree(bitbang); |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 161 | out: |
| 162 | return ret; |
| 163 | } |
| 164 | |
| 165 | static int mdio_ofgpio_remove(struct of_device *ofdev) |
| 166 | { |
| 167 | struct mii_bus *bus = dev_get_drvdata(&ofdev->dev); |
| 168 | struct mdio_gpio_info *bitbang = bus->priv; |
| 169 | |
| 170 | mdiobus_unregister(bus); |
Lennert Buytenhek | 298cf9be | 2008-10-08 16:29:57 -0700 | [diff] [blame^] | 171 | kfree(bus->irq); |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 172 | free_mdio_bitbang(bus); |
| 173 | dev_set_drvdata(&ofdev->dev, NULL); |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 174 | kfree(bitbang); |
Laurent Pinchart | a5edecc | 2008-05-26 11:53:21 +0200 | [diff] [blame] | 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static struct of_device_id mdio_ofgpio_match[] = { |
| 180 | { |
| 181 | .compatible = "virtual,mdio-gpio", |
| 182 | }, |
| 183 | {}, |
| 184 | }; |
| 185 | |
| 186 | static struct of_platform_driver mdio_ofgpio_driver = { |
| 187 | .name = "mdio-gpio", |
| 188 | .match_table = mdio_ofgpio_match, |
| 189 | .probe = mdio_ofgpio_probe, |
| 190 | .remove = mdio_ofgpio_remove, |
| 191 | }; |
| 192 | |
| 193 | static int mdio_ofgpio_init(void) |
| 194 | { |
| 195 | return of_register_platform_driver(&mdio_ofgpio_driver); |
| 196 | } |
| 197 | |
| 198 | static void mdio_ofgpio_exit(void) |
| 199 | { |
| 200 | of_unregister_platform_driver(&mdio_ofgpio_driver); |
| 201 | } |
| 202 | |
| 203 | module_init(mdio_ofgpio_init); |
| 204 | module_exit(mdio_ofgpio_exit); |