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