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