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/string.h> 18 #include <linux/errno.h> 19 #include <linux/unistd.h> 20 #include <linux/slab.h> 21 #include <linux/interrupt.h> 22 #include <linux/init.h> 23 #include <linux/delay.h> 24 #include <linux/netdevice.h> 25 #include <linux/etherdevice.h> 26 #include <linux/skbuff.h> 27 #include <linux/spinlock.h> 28 #include <linux/mm.h> 29 #include <linux/module.h> 30 #include <linux/mii.h> 31 #include <linux/ethtool.h> 32 #include <linux/phy.h> 33 34 #include <asm/io.h> 35 #include <asm/irq.h> 36 #include <asm/uaccess.h> 37 38 /** 39 * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus 40 * @bus: target mii_bus 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 * Returns 0 on success or < 0 on error. 46 */ 47 int mdiobus_register(struct mii_bus *bus) 48 { 49 int i; 50 int err = 0; 51 52 if (NULL == bus || NULL == bus->name || 53 NULL == bus->read || 54 NULL == bus->write) 55 return -EINVAL; 56 57 mutex_init(&bus->mdio_lock); 58 59 if (bus->reset) 60 bus->reset(bus); 61 62 for (i = 0; i < PHY_MAX_ADDR; i++) { 63 struct phy_device *phydev; 64 65 if (bus->phy_mask & (1 << i)) { 66 bus->phy_map[i] = NULL; 67 continue; 68 } 69 70 phydev = get_phy_device(bus, i); 71 72 if (IS_ERR(phydev)) 73 return PTR_ERR(phydev); 74 75 /* There's a PHY at this address 76 * We need to set: 77 * 1) IRQ 78 * 2) bus_id 79 * 3) parent 80 * 4) bus 81 * 5) mii_bus 82 * And, we need to register it */ 83 if (phydev) { 84 phydev->irq = bus->irq[i]; 85 86 phydev->dev.parent = bus->dev; 87 phydev->dev.bus = &mdio_bus_type; 88 snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, i); 89 90 phydev->bus = bus; 91 92 err = device_register(&phydev->dev); 93 94 if (err) { 95 printk(KERN_ERR "phy %d failed to register\n", 96 i); 97 phy_device_free(phydev); 98 phydev = NULL; 99 } 100 } 101 102 bus->phy_map[i] = phydev; 103 } 104 105 pr_info("%s: probed\n", bus->name); 106 107 return err; 108 } 109 EXPORT_SYMBOL(mdiobus_register); 110 111 void mdiobus_unregister(struct mii_bus *bus) 112 { 113 int i; 114 115 for (i = 0; i < PHY_MAX_ADDR; i++) { 116 if (bus->phy_map[i]) 117 device_unregister(&bus->phy_map[i]->dev); 118 } 119 } 120 EXPORT_SYMBOL(mdiobus_unregister); 121 122 /** 123 * mdio_bus_match - determine if given PHY driver supports the given PHY device 124 * @dev: target PHY device 125 * @drv: given PHY driver 126 * 127 * Description: Given a PHY device, and a PHY driver, return 1 if 128 * the driver supports the device. Otherwise, return 0. 129 */ 130 static int mdio_bus_match(struct device *dev, struct device_driver *drv) 131 { 132 struct phy_device *phydev = to_phy_device(dev); 133 struct phy_driver *phydrv = to_phy_driver(drv); 134 135 return ((phydrv->phy_id & phydrv->phy_id_mask) == 136 (phydev->phy_id & phydrv->phy_id_mask)); 137 } 138 139 /* Suspend and resume. Copied from platform_suspend and 140 * platform_resume 141 */ 142 static int mdio_bus_suspend(struct device * dev, pm_message_t state) 143 { 144 int ret = 0; 145 struct device_driver *drv = dev->driver; 146 147 if (drv && drv->suspend) 148 ret = drv->suspend(dev, state); 149 150 return ret; 151 } 152 153 static int mdio_bus_resume(struct device * dev) 154 { 155 int ret = 0; 156 struct device_driver *drv = dev->driver; 157 158 if (drv && drv->resume) 159 ret = drv->resume(dev); 160 161 return ret; 162 } 163 164 struct bus_type mdio_bus_type = { 165 .name = "mdio_bus", 166 .match = mdio_bus_match, 167 .suspend = mdio_bus_suspend, 168 .resume = mdio_bus_resume, 169 }; 170 EXPORT_SYMBOL(mdio_bus_type); 171 172 int __init mdio_bus_init(void) 173 { 174 return bus_register(&mdio_bus_type); 175 } 176 177 void mdio_bus_exit(void) 178 { 179 bus_unregister(&mdio_bus_type); 180 } 181