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/kernel.h> 17 #include <linux/sched.h> 18 #include <linux/string.h> 19 #include <linux/errno.h> 20 #include <linux/unistd.h> 21 #include <linux/slab.h> 22 #include <linux/interrupt.h> 23 #include <linux/init.h> 24 #include <linux/delay.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/skbuff.h> 28 #include <linux/spinlock.h> 29 #include <linux/mm.h> 30 #include <linux/module.h> 31 #include <linux/mii.h> 32 #include <linux/ethtool.h> 33 #include <linux/phy.h> 34 35 #include <asm/io.h> 36 #include <asm/irq.h> 37 #include <asm/uaccess.h> 38 39 /* mdiobus_register 40 * 41 * description: Called by a bus driver to bring up all the PHYs 42 * on a given bus, and attach them to the bus 43 */ 44 int mdiobus_register(struct mii_bus *bus) 45 { 46 int i; 47 int err = 0; 48 49 spin_lock_init(&bus->mdio_lock); 50 51 if (NULL == bus || NULL == bus->name || 52 NULL == bus->read || 53 NULL == bus->write) 54 return -EINVAL; 55 56 if (bus->reset) 57 bus->reset(bus); 58 59 for (i = 0; i < PHY_MAX_ADDR; i++) { 60 struct phy_device *phydev; 61 62 if (bus->phy_mask & (1 << i)) { 63 bus->phy_map[i] = NULL; 64 continue; 65 } 66 67 phydev = get_phy_device(bus, i); 68 69 if (IS_ERR(phydev)) 70 return PTR_ERR(phydev); 71 72 /* There's a PHY at this address 73 * We need to set: 74 * 1) IRQ 75 * 2) bus_id 76 * 3) parent 77 * 4) bus 78 * 5) mii_bus 79 * And, we need to register it */ 80 if (phydev) { 81 phydev->irq = bus->irq[i]; 82 83 phydev->dev.parent = bus->dev; 84 phydev->dev.bus = &mdio_bus_type; 85 snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, i); 86 87 phydev->bus = bus; 88 89 err = device_register(&phydev->dev); 90 91 if (err) 92 printk(KERN_ERR "phy %d failed to register\n", 93 i); 94 } 95 96 bus->phy_map[i] = phydev; 97 } 98 99 pr_info("%s: probed\n", bus->name); 100 101 return err; 102 } 103 EXPORT_SYMBOL(mdiobus_register); 104 105 void mdiobus_unregister(struct mii_bus *bus) 106 { 107 int i; 108 109 for (i = 0; i < PHY_MAX_ADDR; i++) { 110 if (bus->phy_map[i]) { 111 device_unregister(&bus->phy_map[i]->dev); 112 kfree(bus->phy_map[i]); 113 } 114 } 115 } 116 EXPORT_SYMBOL(mdiobus_unregister); 117 118 /* mdio_bus_match 119 * 120 * description: Given a PHY device, and a PHY driver, return 1 if 121 * the driver supports the device. Otherwise, return 0 122 */ 123 static int mdio_bus_match(struct device *dev, struct device_driver *drv) 124 { 125 struct phy_device *phydev = to_phy_device(dev); 126 struct phy_driver *phydrv = to_phy_driver(drv); 127 128 return (phydrv->phy_id == (phydev->phy_id & phydrv->phy_id_mask)); 129 } 130 131 /* Suspend and resume. Copied from platform_suspend and 132 * platform_resume 133 */ 134 static int mdio_bus_suspend(struct device * dev, pm_message_t state) 135 { 136 int ret = 0; 137 struct device_driver *drv = dev->driver; 138 139 if (drv && drv->suspend) 140 ret = drv->suspend(dev, state); 141 142 return ret; 143 } 144 145 static int mdio_bus_resume(struct device * dev) 146 { 147 int ret = 0; 148 struct device_driver *drv = dev->driver; 149 150 if (drv && drv->resume) 151 ret = drv->resume(dev); 152 153 return ret; 154 } 155 156 struct bus_type mdio_bus_type = { 157 .name = "mdio_bus", 158 .match = mdio_bus_match, 159 .suspend = mdio_bus_suspend, 160 .resume = mdio_bus_resume, 161 }; 162 EXPORT_SYMBOL(mdio_bus_type); 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