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   1 /*
   2  * net/dsa/slave.c - Slave device handling
   3  * Copyright (c) 2008 Marvell Semiconductor
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/list.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/phy.h>
  14 #include "dsa_priv.h"
  15
  16 /* slave mii_bus handling ***************************************************/
  17 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  18 {
  19         struct dsa_switch *ds = bus->priv;
  20
  21         if (ds->valid_port_mask & (1 << addr))
  22                 return ds->drv->phy_read(ds, addr, reg);
  23
  24         return 0xffff;
  25 }
  26
  27 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  28 {
  29         struct dsa_switch *ds = bus->priv;
  30
  31         if (ds->valid_port_mask & (1 << addr))
  32                 return ds->drv->phy_write(ds, addr, reg, val);
  33
  34         return 0;
  35 }
  36
  37 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  38 {
  39         ds->slave_mii_bus->priv = (void *)ds;
  40         ds->slave_mii_bus->name = "dsa slave smi";
  41         ds->slave_mii_bus->read = dsa_slave_phy_read;
  42         ds->slave_mii_bus->write = dsa_slave_phy_write;
  43         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "%s:%.2x",
  44                         ds->master_mii_bus->id, ds->pd->sw_addr);
  45         ds->slave_mii_bus->parent = &(ds->master_mii_bus->dev);
  46 }
  47
  48
  49 /* slave device handling ****************************************************/
  50 static int dsa_slave_open(struct net_device *dev)
  51 {
  52         return 0;
  53 }
  54
  55 static int dsa_slave_close(struct net_device *dev)
  56 {
  57         return 0;
  58 }
  59
  60 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
  61 {
  62         struct dsa_slave_priv *p = netdev_priv(dev);
  63         struct net_device *master = p->parent->master_netdev;
  64
  65         if (change & IFF_ALLMULTI)
  66                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
  67         if (change & IFF_PROMISC)
  68                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
  69 }
  70
  71 static void dsa_slave_set_rx_mode(struct net_device *dev)
  72 {
  73         struct dsa_slave_priv *p = netdev_priv(dev);
  74         struct net_device *master = p->parent->master_netdev;
  75
  76         dev_mc_sync(master, dev);
  77         dev_unicast_sync(master, dev);
  78 }
  79
  80 static int dsa_slave_set_mac_address(struct net_device *dev, void *addr)
  81 {
  82         memcpy(dev->dev_addr, addr + 2, 6);
  83
  84         return 0;
  85 }
  86
  87 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  88 {
  89         struct dsa_slave_priv *p = netdev_priv(dev);
  90         struct mii_ioctl_data *mii_data = if_mii(ifr);
  91
  92         if (p->phy != NULL)
  93                 return phy_mii_ioctl(p->phy, mii_data, cmd);
  94
  95         return -EOPNOTSUPP;
  96 }
  97
  98
  99 /* ethtool operations *******************************************************/
 100 static int
 101 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 102 {
 103         struct dsa_slave_priv *p = netdev_priv(dev);
 104         int err;
 105
 106         err = -EOPNOTSUPP;
 107         if (p->phy != NULL) {
 108                 err = phy_read_status(p->phy);
 109                 if (err == 0)
 110                         err = phy_ethtool_gset(p->phy, cmd);
 111         }
 112
 113         return err;
 114 }
 115
 116 static int
 117 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 118 {
 119         struct dsa_slave_priv *p = netdev_priv(dev);
 120
 121         if (p->phy != NULL)
 122                 return phy_ethtool_sset(p->phy, cmd);
 123
 124         return -EOPNOTSUPP;
 125 }
 126
 127 static void dsa_slave_get_drvinfo(struct net_device *dev,
 128                                   struct ethtool_drvinfo *drvinfo)
 129 {
 130         strncpy(drvinfo->driver, "dsa", 32);
 131         strncpy(drvinfo->version, dsa_driver_version, 32);
 132         strncpy(drvinfo->fw_version, "N/A", 32);
 133         strncpy(drvinfo->bus_info, "platform", 32);
 134 }
 135
 136 static int dsa_slave_nway_reset(struct net_device *dev)
 137 {
 138         struct dsa_slave_priv *p = netdev_priv(dev);
 139
 140         if (p->phy != NULL)
 141                 return genphy_restart_aneg(p->phy);
 142
 143         return -EOPNOTSUPP;
 144 }
 145
 146 static u32 dsa_slave_get_link(struct net_device *dev)
 147 {
 148         struct dsa_slave_priv *p = netdev_priv(dev);
 149
 150         if (p->phy != NULL) {
 151                 genphy_update_link(p->phy);
 152                 return p->phy->link;
 153         }
 154
 155         return -EOPNOTSUPP;
 156 }
 157
 158 static void dsa_slave_get_strings(struct net_device *dev,
 159                                   uint32_t stringset, uint8_t *data)
 160 {
 161         struct dsa_slave_priv *p = netdev_priv(dev);
 162         struct dsa_switch *ds = p->parent;
 163
 164         if (stringset == ETH_SS_STATS) {
 165                 int len = ETH_GSTRING_LEN;
 166
 167                 strncpy(data, "tx_packets", len);
 168                 strncpy(data + len, "tx_bytes", len);
 169                 strncpy(data + 2 * len, "rx_packets", len);
 170                 strncpy(data + 3 * len, "rx_bytes", len);
 171                 if (ds->drv->get_strings != NULL)
 172                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 173         }
 174 }
 175
 176 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 177                                         struct ethtool_stats *stats,
 178                                         uint64_t *data)
 179 {
 180         struct dsa_slave_priv *p = netdev_priv(dev);
 181         struct dsa_switch *ds = p->parent;
 182
 183         data[0] = p->dev->stats.tx_packets;
 184         data[1] = p->dev->stats.tx_bytes;
 185         data[2] = p->dev->stats.rx_packets;
 186         data[3] = p->dev->stats.rx_bytes;
 187         if (ds->drv->get_ethtool_stats != NULL)
 188                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 189 }
 190
 191 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 192 {
 193         struct dsa_slave_priv *p = netdev_priv(dev);
 194         struct dsa_switch *ds = p->parent;
 195
 196         if (sset == ETH_SS_STATS) {
 197                 int count;
 198
 199                 count = 4;
 200                 if (ds->drv->get_sset_count != NULL)
 201                         count += ds->drv->get_sset_count(ds);
 202
 203                 return count;
 204         }
 205
 206         return -EOPNOTSUPP;
 207 }
 208
 209 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 210         .get_settings           = dsa_slave_get_settings,
 211         .set_settings           = dsa_slave_set_settings,
 212         .get_drvinfo            = dsa_slave_get_drvinfo,
 213         .nway_reset             = dsa_slave_nway_reset,
 214         .get_link               = dsa_slave_get_link,
 215         .set_sg                 = ethtool_op_set_sg,
 216         .get_strings            = dsa_slave_get_strings,
 217         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 218         .get_sset_count         = dsa_slave_get_sset_count,
 219 };
 220
 221
 222 /* slave device setup *******************************************************/
 223 struct net_device *
 224 dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 225                  int port, char *name)
 226 {
 227         struct net_device *master = ds->master_netdev;
 228         struct net_device *slave_dev;
 229         struct dsa_slave_priv *p;
 230         int ret;
 231
 232         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv),
 233                                  name, ether_setup);
 234         if (slave_dev == NULL)
 235                 return slave_dev;
 236
 237         slave_dev->features = master->vlan_features;
 238         SET_ETHTOOL_OPS(slave_dev, &dsa_slave_ethtool_ops);
 239         memcpy(slave_dev->dev_addr, master->dev_addr, ETH_ALEN);
 240         slave_dev->tx_queue_len = 0;
 241         switch (ds->tag_protocol) {
 242 #ifdef CONFIG_NET_DSA_TAG_DSA
 243         case htons(ETH_P_DSA):
 244                 slave_dev->hard_start_xmit = dsa_xmit;
 245                 break;
 246 #endif
 247 #ifdef CONFIG_NET_DSA_TAG_EDSA
 248         case htons(ETH_P_EDSA):
 249                 slave_dev->hard_start_xmit = edsa_xmit;
 250                 break;
 251 #endif
 252 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 253         case htons(ETH_P_TRAILER):
 254                 slave_dev->hard_start_xmit = trailer_xmit;
 255                 break;
 256 #endif
 257         default:
 258                 BUG();
 259         }
 260         slave_dev->open = dsa_slave_open;
 261         slave_dev->stop = dsa_slave_close;
 262         slave_dev->change_rx_flags = dsa_slave_change_rx_flags;
 263         slave_dev->set_rx_mode = dsa_slave_set_rx_mode;
 264         slave_dev->set_multicast_list = dsa_slave_set_rx_mode;
 265         slave_dev->set_mac_address = dsa_slave_set_mac_address;
 266         slave_dev->do_ioctl = dsa_slave_ioctl;
 267         SET_NETDEV_DEV(slave_dev, parent);
 268         slave_dev->vlan_features = master->vlan_features;
 269
 270         p = netdev_priv(slave_dev);
 271         p->dev = slave_dev;
 272         p->parent = ds;
 273         p->port = port;
 274         p->phy = ds->slave_mii_bus->phy_map[port];
 275
 276         ret = register_netdev(slave_dev);
 277         if (ret) {
 278                 printk(KERN_ERR "%s: error %d registering interface %s\n",
 279                                 master->name, ret, slave_dev->name);
 280                 free_netdev(slave_dev);
 281                 return NULL;
 282         }
 283
 284         netif_carrier_off(slave_dev);
 285
 286         if (p->phy != NULL) {
 287                 phy_attach(slave_dev, p->phy->dev.bus_id,
 288                            0, PHY_INTERFACE_MODE_GMII);
 289
 290                 p->phy->autoneg = AUTONEG_ENABLE;
 291                 p->phy->speed = 0;
 292                 p->phy->duplex = 0;
 293                 p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
 294                 phy_start_aneg(p->phy);
 295         }
 296
 297         return slave_dev;
 298 }