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/mii.h> 33 #include <linux/ethtool.h> 34 #include <linux/phy.h> 35 36 #include <asm/io.h> 37 #include <asm/irq.h> 38 #include <asm/uaccess.h> 39 40 /* mdiobus_register 41 * 42 * description: Called by a bus driver to bring up all the PHYs 43 * on a given bus, and attach them to the bus 44 */ 45 int mdiobus_register(struct mii_bus *bus) 46 { 47 int i; 48 int err = 0; 49 50 spin_lock_init(&bus->mdio_lock); 51 52 if (NULL == bus || NULL == bus->name || 53 NULL == bus->read || 54 NULL == bus->write) 55 return -EINVAL; 56 57 if (bus->reset) 58 bus->reset(bus); 59 60 for (i = 0; i < PHY_MAX_ADDR; i++) { 61 struct phy_device *phydev; 62 63 if (bus->phy_mask & (1 << i)) { 64 bus->phy_map[i] = NULL; 65 continue; 66 } 67 68 phydev = get_phy_device(bus, i); 69 70 if (IS_ERR(phydev)) 71 return PTR_ERR(phydev); 72 73 /* There's a PHY at this address 74 * We need to set: 75 * 1) IRQ 76 * 2) bus_id 77 * 3) parent 78 * 4) bus 79 * 5) mii_bus 80 * And, we need to register it */ 81 if (phydev) { 82 phydev->irq = bus->irq[i]; 83 84 phydev->dev.parent = bus->dev; 85 phydev->dev.bus = &mdio_bus_type; 86 snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, i); 87 88 phydev->bus = bus; 89 90 err = device_register(&phydev->dev); 91 92 if (err) 93 printk(KERN_ERR "phy %d failed to register\n", 94 i); 95 } 96 97 bus->phy_map[i] = phydev; 98 } 99 100 pr_info("%s: probed\n", bus->name); 101 102 return err; 103 } 104 EXPORT_SYMBOL(mdiobus_register); 105 106 void mdiobus_unregister(struct mii_bus *bus) 107 { 108 int i; 109 110 for (i = 0; i < PHY_MAX_ADDR; i++) { 111 if (bus->phy_map[i]) { 112 device_unregister(&bus->phy_map[i]->dev); 113 kfree(bus->phy_map[i]); 114 } 115 } 116 } 117 EXPORT_SYMBOL(mdiobus_unregister); 118 119 /* mdio_bus_match 120 * 121 * description: Given a PHY device, and a PHY driver, return 1 if 122 * the driver supports the device. Otherwise, return 0 123 */ 124 static int mdio_bus_match(struct device *dev, struct device_driver *drv) 125 { 126 struct phy_device *phydev = to_phy_device(dev); 127 struct phy_driver *phydrv = to_phy_driver(drv); 128 129 return (phydrv->phy_id == (phydev->phy_id & phydrv->phy_id_mask)); 130 } 131 132 /* Suspend and resume. Copied from platform_suspend and 133 * platform_resume 134 */ 135 static int mdio_bus_suspend(struct device * dev, pm_message_t state) 136 { 137 int ret = 0; 138 struct device_driver *drv = dev->driver; 139 140 if (drv && drv->suspend) 141 ret = drv->suspend(dev, state); 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); 153 154 return ret; 155 } 156 157 struct bus_type mdio_bus_type = { 158 .name = "mdio_bus", 159 .match = mdio_bus_match, 160 .suspend = mdio_bus_suspend, 161 .resume = mdio_bus_resume, 162 }; 163 164 int __init mdio_bus_init(void) 165 { 166 return bus_register(&mdio_bus_type); 167 } 168 169 void mdio_bus_exit(void) 170 { 171 bus_unregister(&mdio_bus_type); 172 } 173