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