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 #define MII_VSC8221_IMASK_MASK          0xa000
  38
  39 /* Vitesse Interrupt Status Register */
  40 #define MII_VSC8244_ISTAT               0x1a
  41 #define MII_VSC8244_ISTAT_STATUS        0x8000
  42 #define MII_VSC8244_ISTAT_SPEED         0x4000
  43 #define MII_VSC8244_ISTAT_LINK          0x2000
  44 #define MII_VSC8244_ISTAT_DUPLEX        0x1000
  45
  46 /* Vitesse Auxiliary Control/Status Register */
  47 #define MII_VSC8244_AUX_CONSTAT         0x1c
  48 #define MII_VSC8244_AUXCONSTAT_INIT     0x0000
  49 #define MII_VSC8244_AUXCONSTAT_DUPLEX   0x0020
  50 #define MII_VSC8244_AUXCONSTAT_SPEED    0x0018
  51 #define MII_VSC8244_AUXCONSTAT_GBIT     0x0010
  52 #define MII_VSC8244_AUXCONSTAT_100      0x0008
  53
  54 #define MII_VSC8221_AUXCONSTAT_INIT     0x0004 /* need to set this bit? */
  55 #define MII_VSC8221_AUXCONSTAT_RESERVED 0x0004
  56
  57 #define PHY_ID_VSC8244                  0x000fc6c0
  58 #define PHY_ID_VSC8221                  0x000fc550
  59
  60 MODULE_DESCRIPTION("Vitesse PHY driver");
  61 MODULE_AUTHOR("Kriston Carson");
  62 MODULE_LICENSE("GPL");
  63
  64 static int vsc824x_config_init(struct phy_device *phydev)
  65 {
  66         int extcon;
  67         int err;
  68
  69         err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
  70                         MII_VSC8244_AUXCONSTAT_INIT);
  71         if (err < 0)
  72                 return err;
  73
  74         extcon = phy_read(phydev, MII_VSC8244_EXT_CON1);
  75
  76         if (extcon < 0)
  77                 return err;
  78
  79         extcon &= ~(MII_VSC8244_EXTCON1_TX_SKEW_MASK |
  80                         MII_VSC8244_EXTCON1_RX_SKEW_MASK);
  81
  82         if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
  83                 extcon |= (MII_VSC8244_EXTCON1_TX_SKEW |
  84                                 MII_VSC8244_EXTCON1_RX_SKEW);
  85
  86         err = phy_write(phydev, MII_VSC8244_EXT_CON1, extcon);
  87
  88         return err;
  89 }
  90
  91 static int vsc824x_ack_interrupt(struct phy_device *phydev)
  92 {
  93         int err = 0;
  94
  95         /*
  96          * Don't bother to ACK the interrupts if interrupts
  97          * are disabled.  The 824x cannot clear the interrupts
  98          * if they are disabled.
  99          */
 100         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 101                 err = phy_read(phydev, MII_VSC8244_ISTAT);
 102
 103         return (err < 0) ? err : 0;
 104 }
 105
 106 static int vsc82xx_config_intr(struct phy_device *phydev)
 107 {
 108         int err;
 109
 110         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 111                 err = phy_write(phydev, MII_VSC8244_IMASK,
 112                         phydev->drv->phy_id == PHY_ID_VSC8244 ?
 113                                 MII_VSC8244_IMASK_MASK :
 114                                 MII_VSC8221_IMASK_MASK);
 115         else {
 116                 /*
 117                  * The Vitesse PHY cannot clear the interrupt
 118                  * once it has disabled them, so we clear them first
 119                  */
 120                 err = phy_read(phydev, MII_VSC8244_ISTAT);
 121
 122                 if (err < 0)
 123                         return err;
 124
 125                 err = phy_write(phydev, MII_VSC8244_IMASK, 0);
 126         }
 127
 128         return err;
 129 }
 130
 131 /* Vitesse 824x */
 132 static struct phy_driver vsc8244_driver = {
 133         .phy_id         = PHY_ID_VSC8244,
 134         .name           = "Vitesse VSC8244",
 135         .phy_id_mask    = 0x000fffc0,
 136         .features       = PHY_GBIT_FEATURES,
 137         .flags          = PHY_HAS_INTERRUPT,
 138         .config_init    = &vsc824x_config_init,
 139         .config_aneg    = &genphy_config_aneg,
 140         .read_status    = &genphy_read_status,
 141         .ack_interrupt  = &vsc824x_ack_interrupt,
 142         .config_intr    = &vsc82xx_config_intr,
 143         .driver         = { .owner = THIS_MODULE,},
 144 };
 145
 146 static int vsc8221_config_init(struct phy_device *phydev)
 147 {
 148         int err;
 149
 150         err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
 151                         MII_VSC8221_AUXCONSTAT_INIT);
 152         return err;
 153
 154         /* Perhaps we should set EXT_CON1 based on the interface?
 155            Options are 802.3Z SerDes or SGMII */
 156 }
 157
 158 /* Vitesse 8221 */
 159 static struct phy_driver vsc8221_driver = {
 160         .phy_id         = PHY_ID_VSC8221,
 161         .phy_id_mask    = 0x000ffff0,
 162         .name           = "Vitesse VSC8221",
 163         .features       = PHY_GBIT_FEATURES,
 164         .flags          = PHY_HAS_INTERRUPT,
 165         .config_init    = &vsc8221_config_init,
 166         .config_aneg    = &genphy_config_aneg,
 167         .read_status    = &genphy_read_status,
 168         .ack_interrupt  = &vsc824x_ack_interrupt,
 169         .config_intr    = &vsc82xx_config_intr,
 170         .driver         = { .owner = THIS_MODULE,},
 171 };
 172
 173 static int __init vsc82xx_init(void)
 174 {
 175         int err;
 176
 177         err = phy_driver_register(&vsc8244_driver);
 178         if (err < 0)
 179                 return err;
 180         err = phy_driver_register(&vsc8221_driver);
 181         if (err < 0)
 182                 phy_driver_unregister(&vsc8244_driver);
 183         return err;
 184 }
 185
 186 static void __exit vsc82xx_exit(void)
 187 {
 188         phy_driver_unregister(&vsc8244_driver);
 189         phy_driver_unregister(&vsc8221_driver);
 190 }
 191
 192 module_init(vsc82xx_init);
 193 module_exit(vsc82xx_exit);