drivers/staging/octeon/ethernet-mdio.c

   1 /*
   2  * This file is based on code from OCTEON SDK by Cavium Networks.
   3  *
   4  * Copyright (c) 2003-2007 Cavium Networks
   5  *
   6  * This file is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, Version 2, as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/ethtool.h>
  13 #include <linux/phy.h>
  14 #include <linux/ratelimit.h>
  15 #include <linux/of_mdio.h>
  16 #include <generated/utsrelease.h>
  17 #include <net/dst.h>
  18
  19 #include <asm/octeon/octeon.h>
  20
  21 #include "ethernet-defines.h"
  22 #include "octeon-ethernet.h"
  23 #include "ethernet-mdio.h"
  24 #include "ethernet-util.h"
  25
  26 #include <asm/octeon/cvmx-gmxx-defs.h>
  27 #include <asm/octeon/cvmx-smix-defs.h>
  28
  29 static void cvm_oct_get_drvinfo(struct net_device *dev,
  30                                 struct ethtool_drvinfo *info)
  31 {
  32         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
  33         strlcpy(info->version, UTS_RELEASE, sizeof(info->version));
  34         strlcpy(info->bus_info, "Builtin", sizeof(info->bus_info));
  35 }
  36
  37 static int cvm_oct_nway_reset(struct net_device *dev)
  38 {
  39         if (!capable(CAP_NET_ADMIN))
  40                 return -EPERM;
  41
  42         if (dev->phydev)
  43                 return phy_start_aneg(dev->phydev);
  44
  45         return -EINVAL;
  46 }
  47
  48 const struct ethtool_ops cvm_oct_ethtool_ops = {
  49         .get_drvinfo = cvm_oct_get_drvinfo,
  50         .nway_reset = cvm_oct_nway_reset,
  51         .get_link = ethtool_op_get_link,
  52         .get_link_ksettings = phy_ethtool_get_link_ksettings,
  53         .set_link_ksettings = phy_ethtool_set_link_ksettings,
  54 };
  55
  56 /**
  57  * cvm_oct_ioctl - IOCTL support for PHY control
  58  * @dev:    Device to change
  59  * @rq:     the request
  60  * @cmd:    the command
  61  *
  62  * Returns Zero on success
  63  */
  64 int cvm_oct_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
  65 {
  66         if (!netif_running(dev))
  67                 return -EINVAL;
  68
  69         if (!dev->phydev)
  70                 return -EINVAL;
  71
  72         return phy_mii_ioctl(dev->phydev, rq, cmd);
  73 }
  74
  75 void cvm_oct_note_carrier(struct octeon_ethernet *priv,
  76                           cvmx_helper_link_info_t li)
  77 {
  78         if (li.s.link_up) {
  79                 pr_notice_ratelimited("%s: %u Mbps %s duplex, port %d, queue %d\n",
  80                                       netdev_name(priv->netdev), li.s.speed,
  81                                       (li.s.full_duplex) ? "Full" : "Half",
  82                                       priv->port, priv->queue);
  83         } else {
  84                 pr_notice_ratelimited("%s: Link down\n",
  85                                       netdev_name(priv->netdev));
  86         }
  87 }
  88
  89 void cvm_oct_adjust_link(struct net_device *dev)
  90 {
  91         struct octeon_ethernet *priv = netdev_priv(dev);
  92         cvmx_helper_link_info_t link_info;
  93
  94         link_info.u64           = 0;
  95         link_info.s.link_up     = dev->phydev->link ? 1 : 0;
  96         link_info.s.full_duplex = dev->phydev->duplex ? 1 : 0;
  97         link_info.s.speed       = dev->phydev->speed;
  98         priv->link_info         = link_info.u64;
  99
 100         /*
 101          * The polling task need to know about link status changes.
 102          */
 103         if (priv->poll)
 104                 priv->poll(dev);
 105
 106         if (priv->last_link != dev->phydev->link) {
 107                 priv->last_link = dev->phydev->link;
 108                 cvmx_helper_link_set(priv->port, link_info);
 109                 cvm_oct_note_carrier(priv, link_info);
 110         }
 111 }
 112
 113 int cvm_oct_common_stop(struct net_device *dev)
 114 {
 115         struct octeon_ethernet *priv = netdev_priv(dev);
 116         int interface = INTERFACE(priv->port);
 117         cvmx_helper_link_info_t link_info;
 118         union cvmx_gmxx_prtx_cfg gmx_cfg;
 119         int index = INDEX(priv->port);
 120
 121         gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
 122         gmx_cfg.s.en = 0;
 123         cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
 124
 125         priv->poll = NULL;
 126
 127         if (dev->phydev)
 128                 phy_disconnect(dev->phydev);
 129
 130         if (priv->last_link) {
 131                 link_info.u64 = 0;
 132                 priv->last_link = 0;
 133
 134                 cvmx_helper_link_set(priv->port, link_info);
 135                 cvm_oct_note_carrier(priv, link_info);
 136         }
 137         return 0;
 138 }
 139
 140 /**
 141  * cvm_oct_phy_setup_device - setup the PHY
 142  *
 143  * @dev:    Device to setup
 144  *
 145  * Returns Zero on success, negative on failure
 146  */
 147 int cvm_oct_phy_setup_device(struct net_device *dev)
 148 {
 149         struct octeon_ethernet *priv = netdev_priv(dev);
 150         struct device_node *phy_node;
 151         struct phy_device *phydev = NULL;
 152
 153         if (!priv->of_node)
 154                 goto no_phy;
 155
 156         phy_node = of_parse_phandle(priv->of_node, "phy-handle", 0);
 157         if (!phy_node && of_phy_is_fixed_link(priv->of_node)) {
 158                 int rc;
 159
 160                 rc = of_phy_register_fixed_link(priv->of_node);
 161                 if (rc)
 162                         return rc;
 163
 164                 phy_node = of_node_get(priv->of_node);
 165         }
 166         if (!phy_node)
 167                 goto no_phy;
 168
 169         phydev = of_phy_connect(dev, phy_node, cvm_oct_adjust_link, 0,
 170                                 PHY_INTERFACE_MODE_GMII);
 171         of_node_put(phy_node);
 172
 173         if (!phydev)
 174                 return -ENODEV;
 175
 176         priv->last_link = 0;
 177         phy_start_aneg(phydev);
 178
 179         return 0;
 180 no_phy:
 181         /* If there is no phy, assume a direct MAC connection and that
 182          * the link is up.
 183          */
 184         netif_carrier_on(dev);
 185         return 0;
 186 }