kernel/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 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->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_indirect(phydev, LAN88XX_MMD3_CHIP_ID,
  82                                               3, phydev->addr);
  83         priv->chip_rev = phy_read_mmd_indirect(phydev, LAN88XX_MMD3_CHIP_REV,
  84                                                3, phydev->addr);
  85
  86         phydev->priv = priv;
  87
  88         return 0;
  89 }
  90
  91 static void lan88xx_remove(struct phy_device *phydev)
  92 {
  93         struct device *dev = &phydev->dev;
  94         struct lan88xx_priv *priv = phydev->priv;
  95
  96         if (priv)
  97                 devm_kfree(dev, priv);
  98 }
  99
 100 static int lan88xx_set_wol(struct phy_device *phydev,
 101                            struct ethtool_wolinfo *wol)
 102 {
 103         struct lan88xx_priv *priv = phydev->priv;
 104
 105         priv->wolopts = wol->wolopts;
 106
 107         return 0;
 108 }
 109
 110 static struct phy_driver microchip_phy_driver[] = {
 111 {
 112         .phy_id         = 0x0007c130,
 113         .phy_id_mask    = 0xfffffff0,
 114         .name           = "Microchip LAN88xx",
 115
 116         .features       = (PHY_GBIT_FEATURES |
 117                            SUPPORTED_Pause | SUPPORTED_Asym_Pause),
 118         .flags          = PHY_HAS_INTERRUPT | PHY_HAS_MAGICANEG,
 119
 120         .probe          = lan88xx_probe,
 121         .remove         = lan88xx_remove,
 122
 123         .config_init    = genphy_config_init,
 124         .config_aneg    = genphy_config_aneg,
 125         .read_status    = genphy_read_status,
 126
 127         .ack_interrupt  = lan88xx_phy_ack_interrupt,
 128         .config_intr    = lan88xx_phy_config_intr,
 129
 130         .suspend        = lan88xx_suspend,
 131         .resume         = genphy_resume,
 132         .set_wol        = lan88xx_set_wol,
 133
 134         .driver         = { .owner = THIS_MODULE, }
 135 } };
 136
 137 module_phy_driver(microchip_phy_driver);
 138
 139 static struct mdio_device_id __maybe_unused microchip_tbl[] = {
 140         { 0x0007c130, 0xfffffff0 },
 141         { }
 142 };
 143
 144 MODULE_DEVICE_TABLE(mdio, microchip_tbl);
 145
 146 MODULE_AUTHOR(DRIVER_AUTHOR);
 147 MODULE_DESCRIPTION(DRIVER_DESC);
 148 MODULE_LICENSE("GPL");