drivers/net/phy/amd.c

   1 /*
   2  * Driver for AMD am79c PHYs
   3  *
   4  * Author: Heiko Schocher <hs@denx.de>
   5  *
   6  * Copyright (c) 2011 DENX Software Engineering GmbH
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  *
  13  */
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/mii.h>
  19 #include <linux/phy.h>
  20
  21 #define PHY_ID_AM79C874         0x0022561b
  22
  23 #define MII_AM79C_IR            17      /* Interrupt Status/Control Register */
  24 #define MII_AM79C_IR_EN_LINK    0x0400  /* IR enable Linkstate */
  25 #define MII_AM79C_IR_EN_ANEG    0x0100  /* IR enable Aneg Complete */
  26 #define MII_AM79C_IR_IMASK_INIT (MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG)
  27
  28 MODULE_DESCRIPTION("AMD PHY driver");
  29 MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
  30 MODULE_LICENSE("GPL");
  31
  32 static int am79c_ack_interrupt(struct phy_device *phydev)
  33 {
  34         int err;
  35
  36         err = phy_read(phydev, MII_BMSR);
  37         if (err < 0)
  38                 return err;
  39
  40         err = phy_read(phydev, MII_AM79C_IR);
  41         if (err < 0)
  42                 return err;
  43
  44         return 0;
  45 }
  46
  47 static int am79c_config_init(struct phy_device *phydev)
  48 {
  49         return 0;
  50 }
  51
  52 static int am79c_config_intr(struct phy_device *phydev)
  53 {
  54         int err;
  55
  56         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
  57                 err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT);
  58         else
  59                 err = phy_write(phydev, MII_AM79C_IR, 0);
  60
  61         return err;
  62 }
  63
  64 static struct phy_driver am79c_driver = {
  65         .phy_id         = PHY_ID_AM79C874,
  66         .name           = "AM79C874",
  67         .phy_id_mask    = 0xfffffff0,
  68         .features       = PHY_BASIC_FEATURES,
  69         .flags          = PHY_HAS_INTERRUPT,
  70         .config_init    = am79c_config_init,
  71         .config_aneg    = genphy_config_aneg,
  72         .read_status    = genphy_read_status,
  73         .ack_interrupt  = am79c_ack_interrupt,
  74         .config_intr    = am79c_config_intr,
  75         .driver         = { .owner = THIS_MODULE,},
  76 };
  77
  78 static int __init am79c_init(void)
  79 {
  80         int ret;
  81
  82         ret = phy_driver_register(&am79c_driver);
  83         if (ret)
  84                 return ret;
  85
  86         return 0;
  87 }
  88
  89 static void __exit am79c_exit(void)
  90 {
  91         phy_driver_unregister(&am79c_driver);
  92 }
  93
  94 module_init(am79c_init);
  95 module_exit(am79c_exit);
  96
  97 static struct mdio_device_id __maybe_unused amd_tbl[] = {
  98         { PHY_ID_AM79C874, 0xfffffff0 },
  99         { }
 100 };
 101
 102 MODULE_DEVICE_TABLE(mdio, amd_tbl);