target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_phy.c

   1 /*
   2  *  Atheros AR71xx built-in ethernet mac driver
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  Based on Atheros' AG7100 driver
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #include "ag71xx.h"
  15
  16 static void ag71xx_phy_link_adjust(struct net_device *dev)
  17 {
  18         struct ag71xx *ag = netdev_priv(dev);
  19         struct phy_device *phydev = ag->phy_dev;
  20         unsigned long flags;
  21         int status_change = 0;
  22
  23         spin_lock_irqsave(&ag->lock, flags);
  24
  25         if (phydev->link) {
  26                 if (ag->duplex != phydev->duplex
  27                     || ag->speed != phydev->speed) {
  28                         status_change = 1;
  29                 }
  30         }
  31
  32         if (phydev->link != ag->link)
  33                 status_change = 1;
  34
  35         ag->link = phydev->link;
  36         ag->duplex = phydev->duplex;
  37         ag->speed = phydev->speed;
  38
  39         if (status_change)
  40                 ag71xx_link_adjust(ag);
  41
  42         spin_unlock_irqrestore(&ag->lock, flags);
  43 }
  44
  45 void ag71xx_phy_start(struct ag71xx *ag)
  46 {
  47         if (ag->phy_dev) {
  48                 phy_start(ag->phy_dev);
  49         } else {
  50                 ag->link = 1;
  51                 ag71xx_link_adjust(ag);
  52         }
  53 }
  54
  55 void ag71xx_phy_stop(struct ag71xx *ag)
  56 {
  57         if (ag->phy_dev) {
  58                 phy_stop(ag->phy_dev);
  59         } else {
  60                 ag->link = 0;
  61                 ag71xx_link_adjust(ag);
  62         }
  63 }
  64
  65 static int ag71xx_phy_connect_fixed(struct ag71xx *ag)
  66 {
  67         struct net_device *dev = ag->dev;
  68         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
  69         int ret = 0;
  70
  71         /* use fixed settings */
  72         switch (pdata->speed) {
  73         case SPEED_10:
  74         case SPEED_100:
  75         case SPEED_1000:
  76                 break;
  77         default:
  78                 printk(KERN_ERR "%s: invalid speed specified\n", dev->name);
  79                 ret = -EINVAL;
  80                 break;
  81         }
  82
  83         printk(KERN_DEBUG "%s: using fixed link parameters\n", dev->name);
  84
  85         ag->duplex = pdata->duplex;
  86         ag->speed = pdata->speed;
  87
  88         return ret;
  89 }
  90
  91 static int ag71xx_phy_connect_multi(struct ag71xx *ag)
  92 {
  93         struct net_device *dev = ag->dev;
  94         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
  95         struct phy_device *phydev = NULL;
  96         int phy_addr;
  97         int ret = 0;
  98
  99         for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
 100                 if (!(pdata->phy_mask & (1 << phy_addr)))
 101                         continue;
 102
 103                 if (ag->mii_bus->phy_map[phy_addr] == NULL)
 104                         continue;
 105
 106                 DBG("%s: PHY found at %s, uid=%08x\n",
 107                         dev->name,
 108                         dev_name(&ag->mii_bus->phy_map[phy_addr]->dev),
 109                         ag->mii_bus->phy_map[phy_addr]->phy_id);
 110
 111                 if (phydev == NULL)
 112                         phydev = ag->mii_bus->phy_map[phy_addr];
 113         }
 114
 115         if (!phydev) {
 116                 printk(KERN_ERR "%s: no PHY found with phy_mask=%08x\n",
 117                         dev->name, pdata->phy_mask);
 118                 return -ENODEV;
 119         }
 120
 121         ag->phy_dev = phy_connect(dev, dev_name(&phydev->dev),
 122                                   &ag71xx_phy_link_adjust, 0,
 123                                   pdata->phy_if_mode);
 124
 125         if (IS_ERR(ag->phy_dev)) {
 126                 printk(KERN_ERR "%s: could not connect to PHY at %s\n",
 127                         dev->name, dev_name(&phydev->dev));
 128                 return PTR_ERR(ag->phy_dev);
 129         }
 130
 131         /* mask with MAC supported features */
 132         if (pdata->has_gbit)
 133                 phydev->supported &= PHY_GBIT_FEATURES;
 134         else
 135                 phydev->supported &= PHY_BASIC_FEATURES;
 136
 137         phydev->advertising = phydev->supported;
 138
 139         printk(KERN_DEBUG "%s: connected to PHY at %s [uid=%08x, driver=%s]\n",
 140                 dev->name, dev_name(&phydev->dev),
 141                 phydev->phy_id, phydev->drv->name);
 142
 143         ag->link = 0;
 144         ag->speed = 0;
 145         ag->duplex = -1;
 146
 147         return ret;
 148 }
 149
 150 static int dev_is_class(struct device *dev, void *class)
 151 {
 152         if (dev->class != NULL && !strcmp(dev->class->name, class))
 153                 return 1;
 154
 155         return 0;
 156 }
 157
 158 static struct device *dev_find_class(struct device *parent, char *class)
 159 {
 160         if (dev_is_class(parent, class)) {
 161                 get_device(parent);
 162                 return parent;
 163         }
 164
 165         return device_find_child(parent, class, dev_is_class);
 166 }
 167
 168 static struct mii_bus *dev_to_mii_bus(struct device *dev)
 169 {
 170         struct device *d;
 171
 172         d = dev_find_class(dev, "mdio_bus");
 173         if (d != NULL) {
 174                 struct mii_bus *bus;
 175
 176                 bus = to_mii_bus(d);
 177                 put_device(d);
 178
 179                 return bus;
 180         }
 181
 182         return NULL;
 183 }
 184
 185 int ag71xx_phy_connect(struct ag71xx *ag)
 186 {
 187         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 188
 189         ag->mii_bus = dev_to_mii_bus(pdata->mii_bus_dev);
 190         if (ag->mii_bus == NULL) {
 191                 printk(KERN_ERR "%s: unable to find MII bus on device '%s'\n",
 192                         ag->dev->name, dev_name(pdata->mii_bus_dev));
 193                 return -ENODEV;
 194         }
 195
 196         /* Reset the mdio bus explicitly */
 197         if (ag->mii_bus->reset) {
 198                 mutex_lock(&ag->mii_bus->mdio_lock);
 199                 ag->mii_bus->reset(ag->mii_bus);
 200                 mutex_unlock(&ag->mii_bus->mdio_lock);
 201         }
 202
 203         if (pdata->phy_mask)
 204                 return ag71xx_phy_connect_multi(ag);
 205
 206         return ag71xx_phy_connect_fixed(ag);
 207 }
 208
 209 void ag71xx_phy_disconnect(struct ag71xx *ag)
 210 {
 211         if (ag->phy_dev)
 212                 phy_disconnect(ag->phy_dev);
 213 }