drivers/net/phy/microchip.c

   1 /*
   2  * Copyright (C) 2015 Microchip Technology
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/mii.h>
  20 #include <linux/ethtool.h>
  21 #include <linux/phy.h>
  22 #include <linux/microchipphy.h>
  23
  24 #define DRIVER_AUTHOR   "WOOJUNG HUH <woojung.huh@microchip.com>"
  25 #define DRIVER_DESC     "Microchip LAN88XX PHY driver"
  26
  27 struct lan88xx_priv {
  28         int     chip_id;
  29         int     chip_rev;
  30         __u32   wolopts;
  31 };
  32
  33 static int lan88xx_phy_config_intr(struct phy_device *phydev)
  34 {
  35         int rc;
  36
  37         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
  38                 /* unmask all source and clear them before enable */
  39                 rc = phy_write(phydev, LAN88XX_INT_MASK, 0x7FFF);
  40                 rc = phy_read(phydev, LAN88XX_INT_STS);
  41                 rc = phy_write(phydev, LAN88XX_INT_MASK,
  42                                LAN88XX_INT_MASK_MDINTPIN_EN_ |
  43                                LAN88XX_INT_MASK_LINK_CHANGE_);
  44         } else {
  45                 rc = phy_write(phydev, LAN88XX_INT_MASK, 0);
  46         }
  47
  48         return rc < 0 ? rc : 0;
  49 }
  50
  51 static int lan88xx_phy_ack_interrupt(struct phy_device *phydev)
  52 {
  53         int rc = phy_read(phydev, LAN88XX_INT_STS);
  54
  55         return rc < 0 ? rc : 0;
  56 }
  57
  58 static int lan88xx_suspend(struct phy_device *phydev)
  59 {
  60         struct lan88xx_priv *priv = phydev->priv;
  61
  62         /* do not power down PHY when WOL is enabled */
  63         if (!priv->wolopts)
  64                 genphy_suspend(phydev);
  65
  66         return 0;
  67 }
  68
  69 static int lan88xx_probe(struct phy_device *phydev)
  70 {
  71         struct device *dev = &phydev->mdio.dev;
  72         struct lan88xx_priv *priv;
  73
  74         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  75         if (!priv)
  76                 return -ENOMEM;
  77
  78         priv->wolopts = 0;
  79
  80         /* these values can be used to identify internal PHY */
  81         priv->chip_id = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_ID);
  82         priv->chip_rev = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_REV);
  83
  84         phydev->priv = priv;
  85
  86         return 0;
  87 }
  88
  89 static void lan88xx_remove(struct phy_device *phydev)
  90 {
  91         struct device *dev = &phydev->mdio.dev;
  92         struct lan88xx_priv *priv = phydev->priv;
  93
  94         if (priv)
  95                 devm_kfree(dev, priv);
  96 }
  97
  98 static int lan88xx_set_wol(struct phy_device *phydev,
  99                            struct ethtool_wolinfo *wol)
 100 {
 101         struct lan88xx_priv *priv = phydev->priv;
 102
 103         priv->wolopts = wol->wolopts;
 104
 105         return 0;
 106 }
 107
 108 static void lan88xx_set_mdix(struct phy_device *phydev)
 109 {
 110         int buf;
 111         int val;
 112
 113         switch (phydev->mdix_ctrl) {
 114         case ETH_TP_MDI:
 115                 val = LAN88XX_EXT_MODE_CTRL_MDI_;
 116                 break;
 117         case ETH_TP_MDI_X:
 118                 val = LAN88XX_EXT_MODE_CTRL_MDI_X_;
 119                 break;
 120         case ETH_TP_MDI_AUTO:
 121                 val = LAN88XX_EXT_MODE_CTRL_AUTO_MDIX_;
 122                 break;
 123         default:
 124                 return;
 125         }
 126
 127         phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, LAN88XX_EXT_PAGE_SPACE_1);
 128         buf = phy_read(phydev, LAN88XX_EXT_MODE_CTRL);
 129         buf &= ~LAN88XX_EXT_MODE_CTRL_MDIX_MASK_;
 130         buf |= val;
 131         phy_write(phydev, LAN88XX_EXT_MODE_CTRL, buf);
 132         phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, LAN88XX_EXT_PAGE_SPACE_0);
 133 }
 134
 135 static int lan88xx_config_aneg(struct phy_device *phydev)
 136 {
 137         lan88xx_set_mdix(phydev);
 138
 139         return genphy_config_aneg(phydev);
 140 }
 141
 142 static struct phy_driver microchip_phy_driver[] = {
 143 {
 144         .phy_id         = 0x0007c130,
 145         .phy_id_mask    = 0xfffffff0,
 146         .name           = "Microchip LAN88xx",
 147
 148         .features       = PHY_GBIT_FEATURES,
 149         .flags          = PHY_HAS_INTERRUPT,
 150
 151         .probe          = lan88xx_probe,
 152         .remove         = lan88xx_remove,
 153
 154         .config_init    = genphy_config_init,
 155         .config_aneg    = lan88xx_config_aneg,
 156         .read_status    = genphy_read_status,
 157
 158         .ack_interrupt  = lan88xx_phy_ack_interrupt,
 159         .config_intr    = lan88xx_phy_config_intr,
 160
 161         .suspend        = lan88xx_suspend,
 162         .resume         = genphy_resume,
 163         .set_wol        = lan88xx_set_wol,
 164 } };
 165
 166 module_phy_driver(microchip_phy_driver);
 167
 168 static struct mdio_device_id __maybe_unused microchip_tbl[] = {
 169         { 0x0007c130, 0xfffffff0 },
 170         { }
 171 };
 172
 173 MODULE_DEVICE_TABLE(mdio, microchip_tbl);
 174
 175 MODULE_AUTHOR(DRIVER_AUTHOR);
 176 MODULE_DESCRIPTION(DRIVER_DESC);
 177 MODULE_LICENSE("GPL");