drivers/net/phy/mdio_bus.c

   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 }