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                 struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
  51
  52                 ag->duplex = pdata->duplex;
  53                 ag->speed = pdata->speed;
  54                 ag->link = 1;
  55                 ag71xx_link_adjust(ag);
  56         }
  57 }
  58
  59 void ag71xx_phy_stop(struct ag71xx *ag)
  60 {
  61         if (ag->phy_dev) {
  62                 phy_stop(ag->phy_dev);
  63         } else {
  64                 ag->duplex = -1;
  65                 ag->link = 0;
  66                 ag->speed = 0;
  67                 ag71xx_link_adjust(ag);
  68         }
  69 }
  70
  71 static int ag71xx_phy_connect_fixed(struct ag71xx *ag)
  72 {
  73         struct net_device *dev = ag->dev;
  74         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
  75         int ret = 0;
  76
  77         /* use fixed settings */
  78         switch (pdata->speed) {
  79         case SPEED_10:
  80         case SPEED_100:
  81         case SPEED_1000:
  82                 break;
  83         default:
  84                 printk(KERN_ERR "%s: invalid speed specified\n",
  85                         dev->name);
  86                 ret = -EINVAL;
  87                 break;
  88         }
  89
  90         return ret;
  91 }
  92
  93 static int ag71xx_phy_connect_multi(struct ag71xx *ag)
  94 {
  95         struct net_device *dev = ag->dev;
  96         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
  97         struct phy_device *phydev = NULL;
  98         int phy_count = 0;
  99         int phy_addr;
 100         int ret = 0;
 101
 102         for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
 103                 if (!(pdata->phy_mask & (1 << phy_addr)))
 104                         continue;
 105
 106                 if (ag->mii_bus->phy_map[phy_addr] == NULL)
 107                         continue;
 108
 109                 DBG("%s: PHY found at %s, uid=%08x\n",
 110                         dev->name,
 111                         dev_name(&ag->mii_bus->phy_map[phy_addr]->dev),
 112                         ag->mii_bus->phy_map[phy_addr]->phy_id);
 113
 114                 if (phydev == NULL)
 115                         phydev = ag->mii_bus->phy_map[phy_addr];
 116
 117                 phy_count++;
 118         }
 119
 120         switch (phy_count) {
 121         case 0:
 122                 printk(KERN_ERR "%s: no PHY found with phy_mask=%08x\n",
 123                         dev->name, pdata->phy_mask);
 124                 ret = -ENODEV;
 125                 break;
 126         case 1:
 127                 ag->phy_dev = phy_connect(dev, dev_name(&phydev->dev),
 128                         &ag71xx_phy_link_adjust, 0, pdata->phy_if_mode);
 129
 130                 if (IS_ERR(ag->phy_dev)) {
 131                         printk(KERN_ERR "%s: could not connect to PHY at %s\n",
 132                                 dev->name, dev_name(&phydev->dev));
 133                         return PTR_ERR(ag->phy_dev);
 134                 }
 135
 136                 /* mask with MAC supported features */
 137                 if (pdata->has_gbit)
 138                         phydev->supported &= PHY_GBIT_FEATURES;
 139                 else
 140                         phydev->supported &= PHY_BASIC_FEATURES;
 141
 142                 phydev->advertising = phydev->supported;
 143
 144                 printk(KERN_DEBUG "%s: connected to PHY at %s "
 145                         "[uid=%08x, driver=%s]\n",
 146                         dev->name, dev_name(&phydev->dev),
 147                         phydev->phy_id, phydev->drv->name);
 148
 149                 ag->link = 0;
 150                 ag->speed = 0;
 151                 ag->duplex = -1;
 152                 break;
 153
 154         default:
 155                 printk(KERN_DEBUG "%s: connected to %d PHYs\n",
 156                         dev->name, phy_count);
 157                 ret = ag71xx_phy_connect_fixed(ag);
 158                 break;
 159         }
 160
 161         return ret;
 162 }
 163
 164 static int dev_is_class(struct device *dev, void *class)
 165 {
 166         if (dev->class != NULL && !strcmp(dev->class->name, class))
 167                 return 1;
 168
 169         return 0;
 170 }
 171
 172 static struct device *dev_find_class(struct device *parent, char *class)
 173 {
 174         if (dev_is_class(parent, class)) {
 175                 get_device(parent);
 176                 return parent;
 177         }
 178
 179         return device_find_child(parent, class, dev_is_class);
 180 }
 181
 182 static struct mii_bus *dev_to_mii_bus(struct device *dev)
 183 {
 184         struct device *d;
 185
 186         d = dev_find_class(dev, "mdio_bus");
 187         if (d != NULL) {
 188                 struct mii_bus *bus;
 189
 190                 bus = to_mii_bus(d);
 191                 put_device(d);
 192
 193                 return bus;
 194         }
 195
 196         return NULL;
 197 }
 198
 199 int ag71xx_phy_connect(struct ag71xx *ag)
 200 {
 201         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 202
 203         ag->mii_bus = dev_to_mii_bus(pdata->mii_bus_dev);
 204         if (ag->mii_bus == NULL) {
 205                 printk(KERN_ERR "%s: unable to find MII bus on device '%s'\n",
 206                         ag->dev->name, dev_name(pdata->mii_bus_dev));
 207                 return -ENODEV;
 208         }
 209
 210         /* Reset the mdio bus explicitly */
 211         if (ag->mii_bus->reset) {
 212                 mutex_lock(&ag->mii_bus->mdio_lock);
 213                 ag->mii_bus->reset(ag->mii_bus);
 214                 mutex_unlock(&ag->mii_bus->mdio_lock);
 215         }
 216
 217         if (pdata->phy_mask)
 218                 return ag71xx_phy_connect_multi(ag);
 219
 220         return ag71xx_phy_connect_fixed(ag);
 221 }
 222
 223 void ag71xx_phy_disconnect(struct ag71xx *ag)
 224 {
 225         if (ag->phy_dev)
 226                 phy_disconnect(ag->phy_dev);
 227 }