drivers/net/phy/vitesse.c

   1 /*
   2  * Driver for Vitesse PHYs
   3  *
   4  * Author: Kriston Carson
   5  *
   6  * Copyright (c) 2005, 2009 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 int vsc824x_add_skew(struct phy_device *phydev)
  65 {
  66         int err;
  67         int extcon;
  68
  69         extcon = phy_read(phydev, MII_VSC8244_EXT_CON1);
  70
  71         if (extcon < 0)
  72                 return extcon;
  73
  74         extcon &= ~(MII_VSC8244_EXTCON1_TX_SKEW_MASK |
  75                         MII_VSC8244_EXTCON1_RX_SKEW_MASK);
  76
  77         extcon |= (MII_VSC8244_EXTCON1_TX_SKEW |
  78                         MII_VSC8244_EXTCON1_RX_SKEW);
  79
  80         err = phy_write(phydev, MII_VSC8244_EXT_CON1, extcon);
  81
  82         return err;
  83 }
  84 EXPORT_SYMBOL(vsc824x_add_skew);
  85
  86 static int vsc824x_config_init(struct phy_device *phydev)
  87 {
  88         int err;
  89
  90         err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
  91                         MII_VSC8244_AUXCONSTAT_INIT);
  92         if (err < 0)
  93                 return err;
  94
  95         if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
  96                 err = vsc824x_add_skew(phydev);
  97
  98         return err;
  99 }
 100
 101 static int vsc824x_ack_interrupt(struct phy_device *phydev)
 102 {
 103         int err = 0;
 104
 105         /*
 106          * Don't bother to ACK the interrupts if interrupts
 107          * are disabled.  The 824x cannot clear the interrupts
 108          * if they are disabled.
 109          */
 110         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 111                 err = phy_read(phydev, MII_VSC8244_ISTAT);
 112
 113         return (err < 0) ? err : 0;
 114 }
 115
 116 static int vsc82xx_config_intr(struct phy_device *phydev)
 117 {
 118         int err;
 119
 120         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 121                 err = phy_write(phydev, MII_VSC8244_IMASK,
 122                         phydev->drv->phy_id == PHY_ID_VSC8244 ?
 123                                 MII_VSC8244_IMASK_MASK :
 124                                 MII_VSC8221_IMASK_MASK);
 125         else {
 126                 /*
 127                  * The Vitesse PHY cannot clear the interrupt
 128                  * once it has disabled them, so we clear them first
 129                  */
 130                 err = phy_read(phydev, MII_VSC8244_ISTAT);
 131
 132                 if (err < 0)
 133                         return err;
 134
 135                 err = phy_write(phydev, MII_VSC8244_IMASK, 0);
 136         }
 137
 138         return err;
 139 }
 140
 141 static int vsc8221_config_init(struct phy_device *phydev)
 142 {
 143         int err;
 144
 145         err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
 146                         MII_VSC8221_AUXCONSTAT_INIT);
 147         return err;
 148
 149         /* Perhaps we should set EXT_CON1 based on the interface?
 150            Options are 802.3Z SerDes or SGMII */
 151 }
 152
 153 /* Vitesse 824x */
 154 static struct phy_driver vsc82xx_driver[] = {
 155 {
 156         .phy_id         = PHY_ID_VSC8244,
 157         .name           = "Vitesse VSC8244",
 158         .phy_id_mask    = 0x000fffc0,
 159         .features       = PHY_GBIT_FEATURES,
 160         .flags          = PHY_HAS_INTERRUPT,
 161         .config_init    = &vsc824x_config_init,
 162         .config_aneg    = &genphy_config_aneg,
 163         .read_status    = &genphy_read_status,
 164         .ack_interrupt  = &vsc824x_ack_interrupt,
 165         .config_intr    = &vsc82xx_config_intr,
 166         .driver         = { .owner = THIS_MODULE,},
 167 }, {
 168         /* Vitesse 8221 */
 169         .phy_id         = PHY_ID_VSC8221,
 170         .phy_id_mask    = 0x000ffff0,
 171         .name           = "Vitesse VSC8221",
 172         .features       = PHY_GBIT_FEATURES,
 173         .flags          = PHY_HAS_INTERRUPT,
 174         .config_init    = &vsc8221_config_init,
 175         .config_aneg    = &genphy_config_aneg,
 176         .read_status    = &genphy_read_status,
 177         .ack_interrupt  = &vsc824x_ack_interrupt,
 178         .config_intr    = &vsc82xx_config_intr,
 179         .driver         = { .owner = THIS_MODULE,},
 180 } };
 181
 182 static int __init vsc82xx_init(void)
 183 {
 184         return phy_drivers_register(vsc82xx_driver,
 185                 ARRAY_SIZE(vsc82xx_driver));
 186 }
 187
 188 static void __exit vsc82xx_exit(void)
 189 {
 190         return phy_drivers_unregister(vsc82xx_driver,
 191                 ARRAY_SIZE(vsc82xx_driver));
 192 }
 193
 194 module_init(vsc82xx_init);
 195 module_exit(vsc82xx_exit);
 196
 197 static struct mdio_device_id __maybe_unused vitesse_tbl[] = {
 198         { PHY_ID_VSC8244, 0x000fffc0 },
 199         { PHY_ID_VSC8221, 0x000ffff0 },
 200         { }
 201 };
 202
 203 MODULE_DEVICE_TABLE(mdio, vitesse_tbl);