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_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 }