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/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                         continue;
  65
  66                 phydev = get_phy_device(bus, i);
  67
  68                 if (IS_ERR(phydev))
  69                         return PTR_ERR(phydev);
  70
  71                 /* There's a PHY at this address
  72                  * We need to set:
  73                  * 1) IRQ
  74                  * 2) bus_id
  75                  * 3) parent
  76                  * 4) bus
  77                  * 5) mii_bus
  78                  * And, we need to register it */
  79                 if (phydev) {
  80                         phydev->irq = bus->irq[i];
  81
  82                         phydev->dev.parent = bus->dev;
  83                         phydev->dev.bus = &mdio_bus_type;
  84                         snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, i);
  85
  86                         phydev->bus = bus;
  87
  88                         err = device_register(&phydev->dev);
  89
  90                         if (err)
  91                                 printk(KERN_ERR "phy %d failed to register\n",
  92                                                 i);
  93                 }
  94
  95                 bus->phy_map[i] = phydev;
  96         }
  97
  98         pr_info("%s: probed\n", bus->name);
  99
 100         return err;
 101 }
 102 EXPORT_SYMBOL(mdiobus_register);
 103
 104 void mdiobus_unregister(struct mii_bus *bus)
 105 {
 106         int i;
 107
 108         for (i = 0; i < PHY_MAX_ADDR; i++) {
 109                 if (bus->phy_map[i]) {
 110                         device_unregister(&bus->phy_map[i]->dev);
 111                         kfree(bus->phy_map[i]);
 112                 }
 113         }
 114 }
 115 EXPORT_SYMBOL(mdiobus_unregister);
 116
 117 /* mdio_bus_match
 118  *
 119  * description: Given a PHY device, and a PHY driver, return 1 if
 120  *   the driver supports the device.  Otherwise, return 0
 121  */
 122 static int mdio_bus_match(struct device *dev, struct device_driver *drv)
 123 {
 124         struct phy_device *phydev = to_phy_device(dev);
 125         struct phy_driver *phydrv = to_phy_driver(drv);
 126
 127         return (phydrv->phy_id == (phydev->phy_id & phydrv->phy_id_mask));
 128 }
 129
 130 /* Suspend and resume.  Copied from platform_suspend and
 131  * platform_resume
 132  */
 133 static int mdio_bus_suspend(struct device * dev, pm_message_t state)
 134 {
 135         int ret = 0;
 136         struct device_driver *drv = dev->driver;
 137
 138         if (drv && drv->suspend)
 139                 ret = drv->suspend(dev, state);
 140
 141         return ret;
 142 }
 143
 144 static int mdio_bus_resume(struct device * dev)
 145 {
 146         int ret = 0;
 147         struct device_driver *drv = dev->driver;
 148
 149         if (drv && drv->resume)
 150                 ret = drv->resume(dev);
 151
 152         return ret;
 153 }
 154
 155 struct bus_type mdio_bus_type = {
 156         .name           = "mdio_bus",
 157         .match          = mdio_bus_match,
 158         .suspend        = mdio_bus_suspend,
 159         .resume         = mdio_bus_resume,
 160 };
 161
 162 int __init mdio_bus_init(void)
 163 {
 164         return bus_register(&mdio_bus_type);
 165 }
 166
 167 void mdio_bus_exit(void)
 168 {
 169         bus_unregister(&mdio_bus_type);
 170 }