drivers/net/phy/davicom.c

   1 /*
   2  * drivers/net/phy/davicom.c
   3  *
   4  * Driver for Davicom PHYs
   5  *
   6  * Author: Andy Fleming
   7  *
   8  * Copyright (c) 2004 Freescale Semiconductor, Inc.
   9  *
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  *
  15  */
  16 #include <linux/kernel.h>
  17 #include <linux/string.h>
  18 #include <linux/errno.h>
  19 #include <linux/unistd.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/init.h>
  22 #include <linux/delay.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/mm.h>
  28 #include <linux/module.h>
  29 #include <linux/mii.h>
  30 #include <linux/ethtool.h>
  31 #include <linux/phy.h>
  32
  33 #include <asm/io.h>
  34 #include <asm/irq.h>
  35 #include <asm/uaccess.h>
  36
  37 #define MII_DM9161_SCR          0x10
  38 #define MII_DM9161_SCR_INIT     0x0610
  39 #define MII_DM9161_SCR_RMII     0x0100
  40
  41 /* DM9161 Interrupt Register */
  42 #define MII_DM9161_INTR 0x15
  43 #define MII_DM9161_INTR_PEND            0x8000
  44 #define MII_DM9161_INTR_DPLX_MASK       0x0800
  45 #define MII_DM9161_INTR_SPD_MASK        0x0400
  46 #define MII_DM9161_INTR_LINK_MASK       0x0200
  47 #define MII_DM9161_INTR_MASK            0x0100
  48 #define MII_DM9161_INTR_DPLX_CHANGE     0x0010
  49 #define MII_DM9161_INTR_SPD_CHANGE      0x0008
  50 #define MII_DM9161_INTR_LINK_CHANGE     0x0004
  51 #define MII_DM9161_INTR_INIT            0x0000
  52 #define MII_DM9161_INTR_STOP    \
  53 (MII_DM9161_INTR_DPLX_MASK | MII_DM9161_INTR_SPD_MASK \
  54  | MII_DM9161_INTR_LINK_MASK | MII_DM9161_INTR_MASK)
  55
  56 /* DM9161 10BT Configuration/Status */
  57 #define MII_DM9161_10BTCSR      0x12
  58 #define MII_DM9161_10BTCSR_INIT 0x7800
  59
  60 MODULE_DESCRIPTION("Davicom PHY driver");
  61 MODULE_AUTHOR("Andy Fleming");
  62 MODULE_LICENSE("GPL");
  63
  64
  65 #define DM9161_DELAY 1
  66 static int dm9161_config_intr(struct phy_device *phydev)
  67 {
  68         int temp;
  69
  70         temp = phy_read(phydev, MII_DM9161_INTR);
  71
  72         if (temp < 0)
  73                 return temp;
  74
  75         if (PHY_INTERRUPT_ENABLED == phydev->interrupts)
  76                 temp &= ~(MII_DM9161_INTR_STOP);
  77         else
  78                 temp |= MII_DM9161_INTR_STOP;
  79
  80         temp = phy_write(phydev, MII_DM9161_INTR, temp);
  81
  82         return temp;
  83 }
  84
  85 static int dm9161_config_aneg(struct phy_device *phydev)
  86 {
  87         int err;
  88
  89         /* Isolate the PHY */
  90         err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);
  91
  92         if (err < 0)
  93                 return err;
  94
  95         /* Configure the new settings */
  96         err = genphy_config_aneg(phydev);
  97
  98         if (err < 0)
  99                 return err;
 100
 101         return 0;
 102 }
 103
 104 static int dm9161_config_init(struct phy_device *phydev)
 105 {
 106         int err, temp;
 107
 108         /* Isolate the PHY */
 109         err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);
 110
 111         if (err < 0)
 112                 return err;
 113
 114         switch (phydev->interface) {
 115         case PHY_INTERFACE_MODE_MII:
 116                 temp = MII_DM9161_SCR_INIT;
 117                 break;
 118         case PHY_INTERFACE_MODE_RMII:
 119                 temp =  MII_DM9161_SCR_INIT | MII_DM9161_SCR_RMII;
 120                 break;
 121         default:
 122                 return -EINVAL;
 123         }
 124
 125         /* Do not bypass the scrambler/descrambler */
 126         err = phy_write(phydev, MII_DM9161_SCR, temp);
 127         if (err < 0)
 128                 return err;
 129
 130         /* Clear 10BTCSR to default */
 131         err = phy_write(phydev, MII_DM9161_10BTCSR, MII_DM9161_10BTCSR_INIT);
 132
 133         if (err < 0)
 134                 return err;
 135
 136         /* Reconnect the PHY, and enable Autonegotiation */
 137         return phy_write(phydev, MII_BMCR, BMCR_ANENABLE);
 138 }
 139
 140 static int dm9161_ack_interrupt(struct phy_device *phydev)
 141 {
 142         int err = phy_read(phydev, MII_DM9161_INTR);
 143
 144         return (err < 0) ? err : 0;
 145 }
 146
 147 static struct phy_driver dm91xx_driver[] = {
 148 {
 149         .phy_id         = 0x0181b880,
 150         .name           = "Davicom DM9161E",
 151         .phy_id_mask    = 0x0ffffff0,
 152         .features       = PHY_BASIC_FEATURES,
 153         .flags          = PHY_HAS_INTERRUPT,
 154         .config_init    = dm9161_config_init,
 155         .config_aneg    = dm9161_config_aneg,
 156         .read_status    = genphy_read_status,
 157         .ack_interrupt  = dm9161_ack_interrupt,
 158         .config_intr    = dm9161_config_intr,
 159 }, {
 160         .phy_id         = 0x0181b8b0,
 161         .name           = "Davicom DM9161B/C",
 162         .phy_id_mask    = 0x0ffffff0,
 163         .features       = PHY_BASIC_FEATURES,
 164         .flags          = PHY_HAS_INTERRUPT,
 165         .config_init    = dm9161_config_init,
 166         .config_aneg    = dm9161_config_aneg,
 167         .read_status    = genphy_read_status,
 168         .ack_interrupt  = dm9161_ack_interrupt,
 169         .config_intr    = dm9161_config_intr,
 170 }, {
 171         .phy_id         = 0x0181b8a0,
 172         .name           = "Davicom DM9161A",
 173         .phy_id_mask    = 0x0ffffff0,
 174         .features       = PHY_BASIC_FEATURES,
 175         .flags          = PHY_HAS_INTERRUPT,
 176         .config_init    = dm9161_config_init,
 177         .config_aneg    = dm9161_config_aneg,
 178         .read_status    = genphy_read_status,
 179         .ack_interrupt  = dm9161_ack_interrupt,
 180         .config_intr    = dm9161_config_intr,
 181 }, {
 182         .phy_id         = 0x00181b80,
 183         .name           = "Davicom DM9131",
 184         .phy_id_mask    = 0x0ffffff0,
 185         .features       = PHY_BASIC_FEATURES,
 186         .flags          = PHY_HAS_INTERRUPT,
 187         .config_aneg    = genphy_config_aneg,
 188         .read_status    = genphy_read_status,
 189         .ack_interrupt  = dm9161_ack_interrupt,
 190         .config_intr    = dm9161_config_intr,
 191 } };
 192
 193 module_phy_driver(dm91xx_driver);
 194
 195 static struct mdio_device_id __maybe_unused davicom_tbl[] = {
 196         { 0x0181b880, 0x0ffffff0 },
 197         { 0x0181b8b0, 0x0ffffff0 },
 198         { 0x0181b8a0, 0x0ffffff0 },
 199         { 0x00181b80, 0x0ffffff0 },
 200         { }
 201 };
 202
 203 MODULE_DEVICE_TABLE(mdio, davicom_tbl);