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