drivers/net/phy/vitesse.c

   1 /*
   2  * Driver for Vitesse PHYs
   3  *
   4  * Author: Kriston Carson
   5  *
   6  * Copyright (c) 2005 Freescale Semiconductor, Inc.
   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
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/mii.h>
  18 #include <linux/ethtool.h>
  19 #include <linux/phy.h>
  20
  21 /* Vitesse Extended Control Register 1 */
  22 #define MII_VSC8244_EXT_CON1           0x17
  23 #define MII_VSC8244_EXTCON1_INIT       0x0000
  24 #define MII_VSC8244_EXTCON1_TX_SKEW_MASK        0x0c00
  25 #define MII_VSC8244_EXTCON1_RX_SKEW_MASK        0x0300
  26 #define MII_VSC8244_EXTCON1_TX_SKEW     0x0800
  27 #define MII_VSC8244_EXTCON1_RX_SKEW     0x0200
  28
  29 /* Vitesse Interrupt Mask Register */
  30 #define MII_VSC8244_IMASK               0x19
  31 #define MII_VSC8244_IMASK_IEN           0x8000
  32 #define MII_VSC8244_IMASK_SPEED         0x4000
  33 #define MII_VSC8244_IMASK_LINK          0x2000
  34 #define MII_VSC8244_IMASK_DUPLEX        0x1000
  35 #define MII_VSC8244_IMASK_MASK          0xf000
  36
  37 /* Vitesse Interrupt Status Register */
  38 #define MII_VSC8244_ISTAT               0x1a
  39 #define MII_VSC8244_ISTAT_STATUS        0x8000
  40 #define MII_VSC8244_ISTAT_SPEED         0x4000
  41 #define MII_VSC8244_ISTAT_LINK          0x2000
  42 #define MII_VSC8244_ISTAT_DUPLEX        0x1000
  43
  44 /* Vitesse Auxiliary Control/Status Register */
  45 #define MII_VSC8244_AUX_CONSTAT         0x1c
  46 #define MII_VSC8244_AUXCONSTAT_INIT     0x0000
  47 #define MII_VSC8244_AUXCONSTAT_DUPLEX   0x0020
  48 #define MII_VSC8244_AUXCONSTAT_SPEED    0x0018
  49 #define MII_VSC8244_AUXCONSTAT_GBIT     0x0010
  50 #define MII_VSC8244_AUXCONSTAT_100      0x0008
  51
  52 MODULE_DESCRIPTION("Vitesse PHY driver");
  53 MODULE_AUTHOR("Kriston Carson");
  54 MODULE_LICENSE("GPL");
  55
  56 static int vsc824x_config_init(struct phy_device *phydev)
  57 {
  58         int extcon;
  59         int err;
  60
  61         err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
  62                         MII_VSC8244_AUXCONSTAT_INIT);
  63         if (err < 0)
  64                 return err;
  65
  66         extcon = phy_read(phydev, MII_VSC8244_EXT_CON1);
  67
  68         if (extcon < 0)
  69                 return err;
  70
  71         extcon &= ~(MII_VSC8244_EXTCON1_TX_SKEW_MASK |
  72                         MII_VSC8244_EXTCON1_RX_SKEW_MASK);
  73
  74         if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
  75                 extcon |= (MII_VSC8244_EXTCON1_TX_SKEW |
  76                                 MII_VSC8244_EXTCON1_RX_SKEW);
  77
  78         err = phy_write(phydev, MII_VSC8244_EXT_CON1, extcon);
  79
  80         return err;
  81 }
  82
  83 static int vsc824x_ack_interrupt(struct phy_device *phydev)
  84 {
  85         int err = 0;
  86
  87         /*
  88          * Don't bother to ACK the interrupts if interrupts
  89          * are disabled.  The 824x cannot clear the interrupts
  90          * if they are disabled.
  91          */
  92         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
  93                 err = phy_read(phydev, MII_VSC8244_ISTAT);
  94
  95         return (err < 0) ? err : 0;
  96 }
  97
  98 static int vsc824x_config_intr(struct phy_device *phydev)
  99 {
 100         int err;
 101
 102         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 103                 err = phy_write(phydev, MII_VSC8244_IMASK,
 104                                 MII_VSC8244_IMASK_MASK);
 105         else {
 106                 /*
 107                  * The Vitesse PHY cannot clear the interrupt
 108                  * once it has disabled them, so we clear them first
 109                  */
 110                 err = phy_read(phydev, MII_VSC8244_ISTAT);
 111
 112                 if (err < 0)
 113                         return err;
 114
 115                 err = phy_write(phydev, MII_VSC8244_IMASK, 0);
 116         }
 117
 118         return err;
 119 }
 120
 121 /* Vitesse 824x */
 122 static struct phy_driver vsc8244_driver = {
 123         .phy_id         = 0x000fc6c0,
 124         .name           = "Vitesse VSC8244",
 125         .phy_id_mask    = 0x000fffc0,
 126         .features       = PHY_GBIT_FEATURES,
 127         .flags          = PHY_HAS_INTERRUPT,
 128         .config_init    = &vsc824x_config_init,
 129         .config_aneg    = &genphy_config_aneg,
 130         .read_status    = &genphy_read_status,
 131         .ack_interrupt  = &vsc824x_ack_interrupt,
 132         .config_intr    = &vsc824x_config_intr,
 133         .driver         = { .owner = THIS_MODULE,},
 134 };
 135
 136 static int __init vsc8244_init(void)
 137 {
 138         return phy_driver_register(&vsc8244_driver);
 139 }
 140
 141 static void __exit vsc8244_exit(void)
 142 {
 143         phy_driver_unregister(&vsc8244_driver);
 144 }
 145
 146 module_init(vsc8244_init);
 147 module_exit(vsc8244_exit);