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/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_alloc - allocate a mii_bus structure
  40  *
  41  * Description: called by a bus driver to allocate an mii_bus
  42  * structure to fill in.
  43  */
  44 struct mii_bus *mdiobus_alloc(void)
  45 {
  46         return kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
  47 }
  48 EXPORT_SYMBOL(mdiobus_alloc);
  49
  50 /**
  51  * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
  52  * @bus: target mii_bus
  53  *
  54  * Description: Called by a bus driver to bring up all the PHYs
  55  *   on a given bus, and attach them to the bus.
  56  *
  57  * Returns 0 on success or < 0 on error.
  58  */
  59 int mdiobus_register(struct mii_bus *bus)
  60 {
  61         int i;
  62         int err = 0;
  63
  64         if (NULL == bus || NULL == bus->name ||
  65                         NULL == bus->read ||
  66                         NULL == bus->write)
  67                 return -EINVAL;
  68
  69         mutex_init(&bus->mdio_lock);
  70
  71         if (bus->reset)
  72                 bus->reset(bus);
  73
  74         for (i = 0; i < PHY_MAX_ADDR; i++) {
  75                 bus->phy_map[i] = NULL;
  76                 if ((bus->phy_mask & (1 << i)) == 0) {
  77                         struct phy_device *phydev;
  78
  79                         phydev = mdiobus_scan(bus, i);
  80                         if (IS_ERR(phydev))
  81                                 err = PTR_ERR(phydev);
  82                 }
  83         }
  84
  85         pr_info("%s: probed\n", bus->name);
  86
  87         return err;
  88 }
  89 EXPORT_SYMBOL(mdiobus_register);
  90
  91 void mdiobus_unregister(struct mii_bus *bus)
  92 {
  93         int i;
  94
  95         for (i = 0; i < PHY_MAX_ADDR; i++) {
  96                 if (bus->phy_map[i])
  97                         device_unregister(&bus->phy_map[i]->dev);
  98         }
  99 }
 100 EXPORT_SYMBOL(mdiobus_unregister);
 101
 102 /**
 103  * mdiobus_free - free a struct mii_bus
 104  * @bus: mii_bus to free
 105  *
 106  * This function frees the mii_bus.
 107  */
 108 void mdiobus_free(struct mii_bus *bus)
 109 {
 110         kfree(bus);
 111 }
 112 EXPORT_SYMBOL(mdiobus_free);
 113
 114 struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
 115 {
 116         struct phy_device *phydev;
 117         int err;
 118
 119         phydev = get_phy_device(bus, addr);
 120         if (IS_ERR(phydev) || phydev == NULL)
 121                 return phydev;
 122
 123         /* There's a PHY at this address
 124          * We need to set:
 125          * 1) IRQ
 126          * 2) bus_id
 127          * 3) parent
 128          * 4) bus
 129          * 5) mii_bus
 130          * And, we need to register it */
 131
 132         phydev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
 133
 134         phydev->dev.parent = bus->parent;
 135         phydev->dev.bus = &mdio_bus_type;
 136         snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, addr);
 137
 138         phydev->bus = bus;
 139
 140         /* Run all of the fixups for this PHY */
 141         phy_scan_fixups(phydev);
 142
 143         err = device_register(&phydev->dev);
 144         if (err) {
 145                 printk(KERN_ERR "phy %d failed to register\n", addr);
 146                 phy_device_free(phydev);
 147                 phydev = NULL;
 148         }
 149
 150         bus->phy_map[addr] = phydev;
 151
 152         return phydev;
 153 }
 154 EXPORT_SYMBOL(mdiobus_scan);
 155
 156 /**
 157  * mdio_bus_match - determine if given PHY driver supports the given PHY device
 158  * @dev: target PHY device
 159  * @drv: given PHY driver
 160  *
 161  * Description: Given a PHY device, and a PHY driver, return 1 if
 162  *   the driver supports the device.  Otherwise, return 0.
 163  */
 164 static int mdio_bus_match(struct device *dev, struct device_driver *drv)
 165 {
 166         struct phy_device *phydev = to_phy_device(dev);
 167         struct phy_driver *phydrv = to_phy_driver(drv);
 168
 169         return ((phydrv->phy_id & phydrv->phy_id_mask) ==
 170                 (phydev->phy_id & phydrv->phy_id_mask));
 171 }
 172
 173 /* Suspend and resume.  Copied from platform_suspend and
 174  * platform_resume
 175  */
 176 static int mdio_bus_suspend(struct device * dev, pm_message_t state)
 177 {
 178         int ret = 0;
 179         struct device_driver *drv = dev->driver;
 180
 181         if (drv && drv->suspend)
 182                 ret = drv->suspend(dev, state);
 183
 184         return ret;
 185 }
 186
 187 static int mdio_bus_resume(struct device * dev)
 188 {
 189         int ret = 0;
 190         struct device_driver *drv = dev->driver;
 191
 192         if (drv && drv->resume)
 193                 ret = drv->resume(dev);
 194
 195         return ret;
 196 }
 197
 198 struct bus_type mdio_bus_type = {
 199         .name           = "mdio_bus",
 200         .match          = mdio_bus_match,
 201         .suspend        = mdio_bus_suspend,
 202         .resume         = mdio_bus_resume,
 203 };
 204 EXPORT_SYMBOL(mdio_bus_type);
 205
 206 int __init mdio_bus_init(void)
 207 {
 208         return bus_register(&mdio_bus_type);
 209 }
 210
 211 void mdio_bus_exit(void)
 212 {
 213         bus_unregister(&mdio_bus_type);
 214 }