target/linux/ar71xx/files/drivers/net/ethernet/atheros/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->mii_bus_dev && pdata->switch_data) {
  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->mii_bus_dev && pdata->switch_data)
  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 platform_device *pdev = ag->pdev;
  80         struct device *dev = NULL;
  81         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
  82         int ret = 0;
  83
  84         if (!pdev)
  85                 return -ENODEV;
  86
  87         dev = &pdev->dev;
  88
  89         if (!dev)
  90                 return -ENODEV;
  91
  92         if (!ag->phy_dev) {
  93                 pr_err("Missing PHY for %s", dev_name(dev));
  94                 return -ENODEV;
  95         }
  96
  97         /* use fixed settings */
  98         switch (pdata->speed) {
  99         case SPEED_10:
 100         case SPEED_100:
 101         case SPEED_1000:
 102                 break;
 103         default:
 104                 dev_err(dev, "invalid speed specified\n");
 105                 ret = -EINVAL;
 106                 break;
 107         }
 108
 109         dev_dbg(dev, "using fixed link parameters\n");
 110
 111         ag->duplex = pdata->duplex;
 112         ag->speed = pdata->speed;
 113
 114         return ret;
 115 }
 116
 117 static int ag71xx_phy_connect_multi(struct ag71xx *ag)
 118 {
 119         struct device *dev = &ag->pdev->dev;
 120         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 121         struct phy_device *phydev = NULL;
 122         int phy_addr;
 123         int ret = 0;
 124
 125         for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
 126                 if (!(pdata->phy_mask & (1 << phy_addr)))
 127                         continue;
 128
 129 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
 130                 if (ag->mii_bus->phy_map[phy_addr] == NULL)
 131                         continue;
 132
 133                 DBG("%s: PHY found at %s, uid=%08x\n",
 134                         dev_name(dev),
 135                         dev_name(&ag->mii_bus->phy_map[phy_addr]->dev),
 136                         ag->mii_bus->phy_map[phy_addr]->phy_id);
 137
 138                 if (phydev == NULL)
 139                         phydev = ag->mii_bus->phy_map[phy_addr];
 140 #else
 141                 if (ag->mii_bus->mdio_map[phy_addr] == NULL)
 142                         continue;
 143
 144                 DBG("%s: PHY found at %s, uid=%08x\n",
 145                         dev_name(dev),
 146                         dev_name(&ag->mii_bus->mdio_map[phy_addr]->dev),
 147                         ag->mii_bus->mdio_map[phy_addr]->phy_id);
 148
 149                 if (phydev == NULL)
 150                         phydev = mdiobus_get_phy(ag->mii_bus, phy_addr);
 151 #endif
 152         }
 153
 154         if (!phydev) {
 155                 dev_err(dev, "no PHY found with phy_mask=%08x\n",
 156                            pdata->phy_mask);
 157                 return -ENODEV;
 158         }
 159
 160 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
 161         ag->phy_dev = phy_connect(ag->dev, dev_name(&phydev->dev),
 162 #else
 163         ag->phy_dev = phy_connect(ag->dev, phydev_name(phydev),
 164 #endif
 165                                   &ag71xx_phy_link_adjust,
 166                                   pdata->phy_if_mode);
 167
 168         if (IS_ERR(ag->phy_dev)) {
 169                 dev_err(dev, "could not connect to PHY at %s\n",
 170 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
 171                            dev_name(&phydev->dev));
 172 #else
 173                            phydev_name(phydev));
 174 #endif
 175                 return PTR_ERR(ag->phy_dev);
 176         }
 177
 178         /* mask with MAC supported features */
 179         if (pdata->has_gbit)
 180                 phydev->supported &= PHY_GBIT_FEATURES;
 181         else
 182                 phydev->supported &= PHY_BASIC_FEATURES;
 183
 184         phydev->advertising = phydev->supported;
 185
 186         dev_info(dev, "connected to PHY at %s [uid=%08x, driver=%s]\n",
 187 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
 188                     dev_name(&phydev->dev),
 189 #else
 190                     phydev_name(phydev),
 191 #endif
 192                     phydev->phy_id, phydev->drv->name);
 193
 194         ag->link = 0;
 195         ag->speed = 0;
 196         ag->duplex = -1;
 197
 198         return ret;
 199 }
 200
 201 static int dev_is_class(struct device *dev, void *class)
 202 {
 203         if (dev->class != NULL && !strcmp(dev->class->name, class))
 204                 return 1;
 205
 206         return 0;
 207 }
 208
 209 static struct device *dev_find_class(struct device *parent, char *class)
 210 {
 211         if (dev_is_class(parent, class)) {
 212                 get_device(parent);
 213                 return parent;
 214         }
 215
 216         return device_find_child(parent, class, dev_is_class);
 217 }
 218
 219 static struct mii_bus *dev_to_mii_bus(struct device *dev)
 220 {
 221         struct device *d;
 222
 223         d = dev_find_class(dev, "mdio_bus");
 224         if (d != NULL) {
 225                 struct mii_bus *bus;
 226
 227                 bus = to_mii_bus(d);
 228                 put_device(d);
 229
 230                 return bus;
 231         }
 232
 233         return NULL;
 234 }
 235
 236 int ag71xx_phy_connect(struct ag71xx *ag)
 237 {
 238         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 239
 240         if (pdata->mii_bus_dev == NULL ||
 241             pdata->mii_bus_dev->bus == NULL )
 242                 return ag71xx_phy_connect_fixed(ag);
 243
 244         ag->mii_bus = dev_to_mii_bus(pdata->mii_bus_dev);
 245         if (ag->mii_bus == NULL) {
 246                 dev_err(&ag->pdev->dev, "unable to find MII bus on device '%s'\n",
 247                            dev_name(pdata->mii_bus_dev));
 248                 return -ENODEV;
 249         }
 250
 251         /* Reset the mdio bus explicitly */
 252         if (ag->mii_bus->reset) {
 253                 mutex_lock(&ag->mii_bus->mdio_lock);
 254                 ag->mii_bus->reset(ag->mii_bus);
 255                 mutex_unlock(&ag->mii_bus->mdio_lock);
 256         }
 257
 258         if (pdata->switch_data)
 259                 return ag71xx_ar7240_init(ag);
 260
 261         if (pdata->phy_mask)
 262                 return ag71xx_phy_connect_multi(ag);
 263
 264         return ag71xx_phy_connect_fixed(ag);
 265 }
 266
 267 void ag71xx_phy_disconnect(struct ag71xx *ag)
 268 {
 269         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 270
 271         if (pdata->switch_data)
 272                 ag71xx_ar7240_cleanup(ag);
 273         else if (ag->phy_dev)
 274                 phy_disconnect(ag->phy_dev);
 275 }