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/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 }