1 /* 2 * drivers/net/phy/mdio_bus.c 3 * 4 * MDIO Bus interface 5 * 6 * Author: Andy Fleming 7 * 8 * Copyright (c) 2004 Freescale Semiconductor, Inc. 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the 12 * Free Software Foundation; either version 2 of the License, or (at your 13 * option) any later version. 14 * 15 */ 16 #include <linux/config.h> 17 #include <linux/kernel.h> 18 #include <linux/sched.h> 19 #include <linux/string.h> 20 #include <linux/errno.h> 21 #include <linux/unistd.h> 22 #include <linux/slab.h> 23 #include <linux/interrupt.h> 24 #include <linux/init.h> 25 #include <linux/delay.h> 26 #include <linux/netdevice.h> 27 #include <linux/etherdevice.h> 28 #include <linux/skbuff.h> 29 #include <linux/spinlock.h> 30 #include <linux/mm.h> 31 #include <linux/module.h> 32 #include <linux/version.h> 33 #include <linux/mii.h> 34 #include <linux/ethtool.h> 35 #include <linux/phy.h> 36 37 #include <asm/io.h> 38 #include <asm/irq.h> 39 #include <asm/uaccess.h> 40 41 /* mdiobus_register 42 * 43 * description: Called by a bus driver to bring up all the PHYs 44 * on a given bus, and attach them to the bus 45 */ 46 int mdiobus_register(struct mii_bus *bus) 47 { 48 int i; 49 int err = 0; 50 51 spin_lock_init(&bus->mdio_lock); 52 53 if (NULL == bus || NULL == bus->name || 54 NULL == bus->read || 55 NULL == bus->write) 56 return -EINVAL; 57 58 if (bus->reset) 59 bus->reset(bus); 60 61 for (i = 0; i < PHY_MAX_ADDR; i++) { 62 struct phy_device *phydev; 63 64 phydev = get_phy_device(bus, i); 65 66 if (IS_ERR(phydev)) 67 return PTR_ERR(phydev); 68 69 /* There's a PHY at this address 70 * We need to set: 71 * 1) IRQ 72 * 2) bus_id 73 * 3) parent 74 * 4) bus 75 * 5) mii_bus 76 * And, we need to register it */ 77 if (phydev) { 78 phydev->irq = bus->irq[i]; 79 80 phydev->dev.parent = bus->dev; 81 phydev->dev.bus = &mdio_bus_type; 82 sprintf(phydev->dev.bus_id, "phy%d:%d", bus->id, i); 83 84 phydev->bus = bus; 85 86 err = device_register(&phydev->dev); 87 88 if (err) 89 printk(KERN_ERR "phy %d failed to register\n", 90 i); 91 } 92 93 bus->phy_map[i] = phydev; 94 } 95 96 pr_info("%s: probed\n", bus->name); 97 98 return err; 99 } 100 EXPORT_SYMBOL(mdiobus_register); 101 102 void mdiobus_unregister(struct mii_bus *bus) 103 { 104 int i; 105 106 for (i = 0; i < PHY_MAX_ADDR; i++) { 107 if (bus->phy_map[i]) { 108 device_unregister(&bus->phy_map[i]->dev); 109 kfree(bus->phy_map[i]); 110 } 111 } 112 } 113 EXPORT_SYMBOL(mdiobus_unregister); 114 115 /* mdio_bus_match 116 * 117 * description: Given a PHY device, and a PHY driver, return 1 if 118 * the driver supports the device. Otherwise, return 0 119 */ 120 static int mdio_bus_match(struct device *dev, struct device_driver *drv) 121 { 122 struct phy_device *phydev = to_phy_device(dev); 123 struct phy_driver *phydrv = to_phy_driver(drv); 124 125 return (phydrv->phy_id == (phydev->phy_id & phydrv->phy_id_mask)); 126 } 127 128 /* Suspend and resume. Copied from platform_suspend and 129 * platform_resume 130 */ 131 static int mdio_bus_suspend(struct device * dev, pm_message_t state) 132 { 133 int ret = 0; 134 struct device_driver *drv = dev->driver; 135 136 if (drv && drv->suspend) { 137 ret = drv->suspend(dev, state, SUSPEND_DISABLE); 138 if (ret == 0) 139 ret = drv->suspend(dev, state, SUSPEND_SAVE_STATE); 140 if (ret == 0) 141 ret = drv->suspend(dev, state, SUSPEND_POWER_DOWN); 142 } 143 return ret; 144 } 145 146 static int mdio_bus_resume(struct device * dev) 147 { 148 int ret = 0; 149 struct device_driver *drv = dev->driver; 150 151 if (drv && drv->resume) { 152 ret = drv->resume(dev, RESUME_POWER_ON); 153 if (ret == 0) 154 ret = drv->resume(dev, RESUME_RESTORE_STATE); 155 if (ret == 0) 156 ret = drv->resume(dev, RESUME_ENABLE); 157 } 158 return ret; 159 } 160 161 struct bus_type mdio_bus_type = { 162 .name = "mdio_bus", 163 .match = mdio_bus_match, 164 .suspend = mdio_bus_suspend, 165 .resume = mdio_bus_resume, 166 }; 167 168 int __init mdio_bus_init(void) 169 { 170 return bus_register(&mdio_bus_type); 171 } 172 173 void __exit mdio_bus_exit(void) 174 { 175 bus_unregister(&mdio_bus_type); 176 } 177