drivers/net/phy/amd.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for AMD am79c PHYs
   4  *
   5  * Author: Heiko Schocher <hs@denx.de>
   6  *
   7  * Copyright (c) 2011 DENX Software Engineering GmbH
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/errno.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/mii.h>
  14 #include <linux/phy.h>
  15
  16 #define PHY_ID_AM79C874         0x0022561b
  17
  18 #define MII_AM79C_IR            17      /* Interrupt Status/Control Register */
  19 #define MII_AM79C_IR_EN_LINK    0x0400  /* IR enable Linkstate */
  20 #define MII_AM79C_IR_EN_ANEG    0x0100  /* IR enable Aneg Complete */
  21 #define MII_AM79C_IR_IMASK_INIT (MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG)
  22
  23 MODULE_DESCRIPTION("AMD PHY driver");
  24 MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
  25 MODULE_LICENSE("GPL");
  26
  27 static int am79c_ack_interrupt(struct phy_device *phydev)
  28 {
  29         int err;
  30
  31         err = phy_read(phydev, MII_BMSR);
  32         if (err < 0)
  33                 return err;
  34
  35         err = phy_read(phydev, MII_AM79C_IR);
  36         if (err < 0)
  37                 return err;
  38
  39         return 0;
  40 }
  41
  42 static int am79c_config_init(struct phy_device *phydev)
  43 {
  44         return 0;
  45 }
  46
  47 static int am79c_config_intr(struct phy_device *phydev)
  48 {
  49         int err;
  50
  51         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
  52                 err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT);
  53         else
  54                 err = phy_write(phydev, MII_AM79C_IR, 0);
  55
  56         return err;
  57 }
  58
  59 static struct phy_driver am79c_driver[] = { {
  60         .phy_id         = PHY_ID_AM79C874,
  61         .name           = "AM79C874",
  62         .phy_id_mask    = 0xfffffff0,
  63         .features       = PHY_BASIC_FEATURES,
  64         .config_init    = am79c_config_init,
  65         .ack_interrupt  = am79c_ack_interrupt,
  66         .config_intr    = am79c_config_intr,
  67 } };
  68
  69 module_phy_driver(am79c_driver);
  70
  71 static struct mdio_device_id __maybe_unused amd_tbl[] = {
  72         { PHY_ID_AM79C874, 0xfffffff0 },
  73         { }
  74 };
  75
  76 MODULE_DEVICE_TABLE(mdio, amd_tbl);