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         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
  48
  49         if (ag->phy_dev) {
  50                 phy_start(ag->phy_dev);
  51         } else if (pdata->has_ar7240_switch) {
  52                 ag71xx_ar7240_start(ag);
  53         } else {
  54                 ag->link = 1;
  55                 ag71xx_link_adjust(ag);
  56         }
  57 }
  58
  59 void ag71xx_phy_stop(struct ag71xx *ag)
  60 {
  61         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
  62         unsigned long flags;
  63
  64         if (ag->phy_dev)
  65                 phy_stop(ag->phy_dev);
  66         else if (pdata->has_ar7240_switch)
  67                         ag71xx_ar7240_stop(ag);
  68
  69         spin_lock_irqsave(&ag->lock, flags);
  70         if (ag->link) {
  71                 ag->link = 0;
  72                 ag71xx_link_adjust(ag);
  73         }
  74         spin_unlock_irqrestore(&ag->lock, flags);
  75 }
  76
  77 static int ag71xx_phy_connect_fixed(struct ag71xx *ag)
  78 {
  79         struct net_device *dev = ag->dev;
  80         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
  81         int ret = 0;
  82
  83         /* use fixed settings */
  84         switch (pdata->speed) {
  85         case SPEED_10:
  86         case SPEED_100:
  87         case SPEED_1000:
  88                 break;
  89         default:
  90                 printk(KERN_ERR "%s: invalid speed specified\n", dev->name);
  91                 ret = -EINVAL;
  92                 break;
  93         }
  94
  95         printk(KERN_DEBUG "%s: using fixed link parameters\n", dev->name);
  96
  97         ag->duplex = pdata->duplex;
  98         ag->speed = pdata->speed;
  99
 100         return ret;
 101 }
 102
 103 static int ag71xx_phy_connect_multi(struct ag71xx *ag)
 104 {
 105         struct net_device *dev = ag->dev;
 106         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 107         struct phy_device *phydev = NULL;
 108         int phy_addr;
 109         int ret = 0;
 110
 111         for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
 112                 if (!(pdata->phy_mask & (1 << phy_addr)))
 113                         continue;
 114
 115                 if (ag->mii_bus->phy_map[phy_addr] == NULL)
 116                         continue;
 117
 118                 DBG("%s: PHY found at %s, uid=%08x\n",
 119                         dev->name,
 120                         dev_name(&ag->mii_bus->phy_map[phy_addr]->dev),
 121                         ag->mii_bus->phy_map[phy_addr]->phy_id);
 122
 123                 if (phydev == NULL)
 124                         phydev = ag->mii_bus->phy_map[phy_addr];
 125         }
 126
 127         if (!phydev) {
 128                 printk(KERN_ERR "%s: no PHY found with phy_mask=%08x\n",
 129                         dev->name, pdata->phy_mask);
 130                 return -ENODEV;
 131         }
 132
 133         ag->phy_dev = phy_connect(dev, dev_name(&phydev->dev),
 134                                   &ag71xx_phy_link_adjust, 0,
 135                                   pdata->phy_if_mode);
 136
 137         if (IS_ERR(ag->phy_dev)) {
 138                 printk(KERN_ERR "%s: could not connect to PHY at %s\n",
 139                         dev->name, dev_name(&phydev->dev));
 140                 return PTR_ERR(ag->phy_dev);
 141         }
 142
 143         /* mask with MAC supported features */
 144         if (pdata->has_gbit)
 145                 phydev->supported &= PHY_GBIT_FEATURES;
 146         else
 147                 phydev->supported &= PHY_BASIC_FEATURES;
 148
 149         phydev->advertising = phydev->supported;
 150
 151         printk(KERN_DEBUG "%s: connected to PHY at %s [uid=%08x, driver=%s]\n",
 152                 dev->name, dev_name(&phydev->dev),
 153                 phydev->phy_id, phydev->drv->name);
 154
 155         ag->link = 0;
 156         ag->speed = 0;
 157         ag->duplex = -1;
 158
 159         return ret;
 160 }
 161
 162 static int dev_is_class(struct device *dev, void *class)
 163 {
 164         if (dev->class != NULL && !strcmp(dev->class->name, class))
 165                 return 1;
 166
 167         return 0;
 168 }
 169
 170 static struct device *dev_find_class(struct device *parent, char *class)
 171 {
 172         if (dev_is_class(parent, class)) {
 173                 get_device(parent);
 174                 return parent;
 175         }
 176
 177         return device_find_child(parent, class, dev_is_class);
 178 }
 179
 180 static struct mii_bus *dev_to_mii_bus(struct device *dev)
 181 {
 182         struct device *d;
 183
 184         d = dev_find_class(dev, "mdio_bus");
 185         if (d != NULL) {
 186                 struct mii_bus *bus;
 187
 188                 bus = to_mii_bus(d);
 189                 put_device(d);
 190
 191                 return bus;
 192         }
 193
 194         return NULL;
 195 }
 196
 197 int __devinit ag71xx_phy_connect(struct ag71xx *ag)
 198 {
 199         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 200
 201         if (pdata->mii_bus_dev == NULL ||
 202             pdata->mii_bus_dev->bus == NULL )
 203                 return ag71xx_phy_connect_fixed(ag);
 204
 205         ag->mii_bus = dev_to_mii_bus(pdata->mii_bus_dev);
 206         if (ag->mii_bus == NULL) {
 207                 printk(KERN_ERR "%s: unable to find MII bus on device '%s'\n",
 208                         ag->dev->name, dev_name(pdata->mii_bus_dev));
 209                 return -ENODEV;
 210         }
 211
 212         /* Reset the mdio bus explicitly */
 213         if (ag->mii_bus->reset) {
 214                 mutex_lock(&ag->mii_bus->mdio_lock);
 215                 ag->mii_bus->reset(ag->mii_bus);
 216                 mutex_unlock(&ag->mii_bus->mdio_lock);
 217         }
 218
 219         if (pdata->has_ar7240_switch)
 220                 return ag71xx_ar7240_init(ag);
 221
 222         if (pdata->phy_mask)
 223                 return ag71xx_phy_connect_multi(ag);
 224
 225         return ag71xx_phy_connect_fixed(ag);
 226 }
 227
 228 void ag71xx_phy_disconnect(struct ag71xx *ag)
 229 {
 230         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 231
 232         if (pdata->has_ar7240_switch)
 233                 ag71xx_ar7240_cleanup(ag);
 234         else if (ag->phy_dev)
 235                 phy_disconnect(ag->phy_dev);
 236 }