drivers/staging/octeon/ethernet-mdio.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * This file is based on code from OCTEON SDK by Cavium Networks.
   4  *
   5  * Copyright (c) 2003-2007 Cavium Networks
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/ethtool.h>
  10 #include <linux/phy.h>
  11 #include <linux/ratelimit.h>
  12 #include <linux/of_mdio.h>
  13 #include <net/dst.h>
  14
  15 #include "octeon-ethernet.h"
  16 #include "ethernet-defines.h"
  17 #include "ethernet-mdio.h"
  18 #include "ethernet-util.h"
  19
  20 static void cvm_oct_get_drvinfo(struct net_device *dev,
  21                                 struct ethtool_drvinfo *info)
  22 {
  23         strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
  24         strscpy(info->bus_info, "Builtin", sizeof(info->bus_info));
  25 }
  26
  27 static int cvm_oct_nway_reset(struct net_device *dev)
  28 {
  29         if (!capable(CAP_NET_ADMIN))
  30                 return -EPERM;
  31
  32         if (dev->phydev)
  33                 return phy_start_aneg(dev->phydev);
  34
  35         return -EINVAL;
  36 }
  37
  38 const struct ethtool_ops cvm_oct_ethtool_ops = {
  39         .get_drvinfo = cvm_oct_get_drvinfo,
  40         .nway_reset = cvm_oct_nway_reset,
  41         .get_link = ethtool_op_get_link,
  42         .get_link_ksettings = phy_ethtool_get_link_ksettings,
  43         .set_link_ksettings = phy_ethtool_set_link_ksettings,
  44 };
  45
  46 /**
  47  * cvm_oct_ioctl - IOCTL support for PHY control
  48  * @dev:    Device to change
  49  * @rq:     the request
  50  * @cmd:    the command
  51  *
  52  * Returns Zero on success
  53  */
  54 int cvm_oct_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
  55 {
  56         if (!netif_running(dev))
  57                 return -EINVAL;
  58
  59         if (!dev->phydev)
  60                 return -EINVAL;
  61
  62         return phy_mii_ioctl(dev->phydev, rq, cmd);
  63 }
  64
  65 void cvm_oct_note_carrier(struct octeon_ethernet *priv,
  66                           union cvmx_helper_link_info li)
  67 {
  68         if (li.s.link_up) {
  69                 pr_notice_ratelimited("%s: %u Mbps %s duplex, port %d, queue %d\n",
  70                                       netdev_name(priv->netdev), li.s.speed,
  71                                       (li.s.full_duplex) ? "Full" : "Half",
  72                                       priv->port, priv->queue);
  73         } else {
  74                 pr_notice_ratelimited("%s: Link down\n",
  75                                       netdev_name(priv->netdev));
  76         }
  77 }
  78
  79 void cvm_oct_adjust_link(struct net_device *dev)
  80 {
  81         struct octeon_ethernet *priv = netdev_priv(dev);
  82         union cvmx_helper_link_info link_info;
  83
  84         link_info.u64           = 0;
  85         link_info.s.link_up     = dev->phydev->link ? 1 : 0;
  86         link_info.s.full_duplex = dev->phydev->duplex ? 1 : 0;
  87         link_info.s.speed       = dev->phydev->speed;
  88         priv->link_info         = link_info.u64;
  89
  90         /*
  91          * The polling task need to know about link status changes.
  92          */
  93         if (priv->poll)
  94                 priv->poll(dev);
  95
  96         if (priv->last_link != dev->phydev->link) {
  97                 priv->last_link = dev->phydev->link;
  98                 cvmx_helper_link_set(priv->port, link_info);
  99                 cvm_oct_note_carrier(priv, link_info);
 100         }
 101 }
 102
 103 int cvm_oct_common_stop(struct net_device *dev)
 104 {
 105         struct octeon_ethernet *priv = netdev_priv(dev);
 106         int interface = INTERFACE(priv->port);
 107         union cvmx_helper_link_info link_info;
 108         union cvmx_gmxx_prtx_cfg gmx_cfg;
 109         int index = INDEX(priv->port);
 110
 111         gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
 112         gmx_cfg.s.en = 0;
 113         cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
 114
 115         priv->poll = NULL;
 116
 117         if (dev->phydev)
 118                 phy_disconnect(dev->phydev);
 119
 120         if (priv->last_link) {
 121                 link_info.u64 = 0;
 122                 priv->last_link = 0;
 123
 124                 cvmx_helper_link_set(priv->port, link_info);
 125                 cvm_oct_note_carrier(priv, link_info);
 126         }
 127         return 0;
 128 }
 129
 130 /**
 131  * cvm_oct_phy_setup_device - setup the PHY
 132  *
 133  * @dev:    Device to setup
 134  *
 135  * Returns Zero on success, negative on failure
 136  */
 137 int cvm_oct_phy_setup_device(struct net_device *dev)
 138 {
 139         struct octeon_ethernet *priv = netdev_priv(dev);
 140         struct device_node *phy_node;
 141         struct phy_device *phydev = NULL;
 142
 143         if (!priv->of_node)
 144                 goto no_phy;
 145
 146         phy_node = of_parse_phandle(priv->of_node, "phy-handle", 0);
 147         if (!phy_node && of_phy_is_fixed_link(priv->of_node))
 148                 phy_node = of_node_get(priv->of_node);
 149         if (!phy_node)
 150                 goto no_phy;
 151
 152         phydev = of_phy_connect(dev, phy_node, cvm_oct_adjust_link, 0,
 153                                 priv->phy_mode);
 154         of_node_put(phy_node);
 155
 156         if (!phydev)
 157                 return -EPROBE_DEFER;
 158
 159         priv->last_link = 0;
 160         phy_start(phydev);
 161
 162         return 0;
 163 no_phy:
 164         /* If there is no phy, assume a direct MAC connection and that
 165          * the link is up.
 166          */
 167         netif_carrier_on(dev);
 168         return 0;
 169 }