drivers/net/phy/lxt.c

   1 /*
   2  * drivers/net/phy/lxt.c
   3  *
   4  * Driver for Intel LXT 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 <linux/uaccess.h>
  36
  37 /* The Level one LXT970 is used by many boards                               */
  38
  39 #define MII_LXT970_IER       17  /* Interrupt Enable Register */
  40
  41 #define MII_LXT970_IER_IEN      0x0002
  42
  43 #define MII_LXT970_ISR       18  /* Interrupt Status Register */
  44
  45 #define MII_LXT970_CONFIG    19  /* Configuration Register    */
  46
  47 /* ------------------------------------------------------------------------- */
  48 /* The Level one LXT971 is used on some of my custom boards                  */
  49
  50 /* register definitions for the 971 */
  51 #define MII_LXT971_IER          18  /* Interrupt Enable Register */
  52 #define MII_LXT971_IER_IEN      0x00f2
  53
  54 #define MII_LXT971_ISR          19  /* Interrupt Status Register */
  55
  56 /* register definitions for the 973 */
  57 #define MII_LXT973_PCR 16 /* Port Configuration Register */
  58 #define PCR_FIBER_SELECT 1
  59
  60 MODULE_DESCRIPTION("Intel LXT PHY driver");
  61 MODULE_AUTHOR("Andy Fleming");
  62 MODULE_LICENSE("GPL");
  63
  64 static int lxt970_ack_interrupt(struct phy_device *phydev)
  65 {
  66         int err;
  67
  68         err = phy_read(phydev, MII_BMSR);
  69
  70         if (err < 0)
  71                 return err;
  72
  73         err = phy_read(phydev, MII_LXT970_ISR);
  74
  75         if (err < 0)
  76                 return err;
  77
  78         return 0;
  79 }
  80
  81 static int lxt970_config_intr(struct phy_device *phydev)
  82 {
  83         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
  84                 return phy_write(phydev, MII_LXT970_IER, MII_LXT970_IER_IEN);
  85         else
  86                 return phy_write(phydev, MII_LXT970_IER, 0);
  87 }
  88
  89 static int lxt970_config_init(struct phy_device *phydev)
  90 {
  91         return phy_write(phydev, MII_LXT970_CONFIG, 0);
  92 }
  93
  94
  95 static int lxt971_ack_interrupt(struct phy_device *phydev)
  96 {
  97         int err = phy_read(phydev, MII_LXT971_ISR);
  98
  99         if (err < 0)
 100                 return err;
 101
 102         return 0;
 103 }
 104
 105 static int lxt971_config_intr(struct phy_device *phydev)
 106 {
 107         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 108                 return phy_write(phydev, MII_LXT971_IER, MII_LXT971_IER_IEN);
 109         else
 110                 return phy_write(phydev, MII_LXT971_IER, 0);
 111 }
 112
 113 /*
 114  * A2 version of LXT973 chip has an ERRATA: it randomly return the contents
 115  * of the previous even register when you read a odd register regularly
 116  */
 117
 118 static int lxt973a2_update_link(struct phy_device *phydev)
 119 {
 120         int status;
 121         int control;
 122         int retry = 8; /* we try 8 times */
 123
 124         /* Do a fake read */
 125         status = phy_read(phydev, MII_BMSR);
 126
 127         if (status < 0)
 128                 return status;
 129
 130         control = phy_read(phydev, MII_BMCR);
 131         if (control < 0)
 132                 return control;
 133
 134         do {
 135                 /* Read link and autonegotiation status */
 136                 status = phy_read(phydev, MII_BMSR);
 137         } while (status >= 0 && retry-- && status == control);
 138
 139         if (status < 0)
 140                 return status;
 141
 142         if ((status & BMSR_LSTATUS) == 0)
 143                 phydev->link = 0;
 144         else
 145                 phydev->link = 1;
 146
 147         return 0;
 148 }
 149
 150 static int lxt973a2_read_status(struct phy_device *phydev)
 151 {
 152         int adv;
 153         int err;
 154         int lpa;
 155         int lpagb = 0;
 156
 157         /* Update the link, but return if there was an error */
 158         err = lxt973a2_update_link(phydev);
 159         if (err)
 160                 return err;
 161
 162         if (AUTONEG_ENABLE == phydev->autoneg) {
 163                 int retry = 1;
 164
 165                 adv = phy_read(phydev, MII_ADVERTISE);
 166
 167                 if (adv < 0)
 168                         return adv;
 169
 170                 do {
 171                         lpa = phy_read(phydev, MII_LPA);
 172
 173                         if (lpa < 0)
 174                                 return lpa;
 175
 176                         /* If both registers are equal, it is suspect but not
 177                         * impossible, hence a new try
 178                         */
 179                 } while (lpa == adv && retry--);
 180
 181                 lpa &= adv;
 182
 183                 phydev->speed = SPEED_10;
 184                 phydev->duplex = DUPLEX_HALF;
 185                 phydev->pause = phydev->asym_pause = 0;
 186
 187                 if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {
 188                         phydev->speed = SPEED_1000;
 189
 190                         if (lpagb & LPA_1000FULL)
 191                                 phydev->duplex = DUPLEX_FULL;
 192                 } else if (lpa & (LPA_100FULL | LPA_100HALF)) {
 193                         phydev->speed = SPEED_100;
 194
 195                         if (lpa & LPA_100FULL)
 196                                 phydev->duplex = DUPLEX_FULL;
 197                 } else {
 198                         if (lpa & LPA_10FULL)
 199                                 phydev->duplex = DUPLEX_FULL;
 200                 }
 201
 202                 if (phydev->duplex == DUPLEX_FULL) {
 203                         phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
 204                         phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
 205                 }
 206         } else {
 207                 int bmcr = phy_read(phydev, MII_BMCR);
 208
 209                 if (bmcr < 0)
 210                         return bmcr;
 211
 212                 if (bmcr & BMCR_FULLDPLX)
 213                         phydev->duplex = DUPLEX_FULL;
 214                 else
 215                         phydev->duplex = DUPLEX_HALF;
 216
 217                 if (bmcr & BMCR_SPEED1000)
 218                         phydev->speed = SPEED_1000;
 219                 else if (bmcr & BMCR_SPEED100)
 220                         phydev->speed = SPEED_100;
 221                 else
 222                         phydev->speed = SPEED_10;
 223
 224                 phydev->pause = phydev->asym_pause = 0;
 225         }
 226
 227         return 0;
 228 }
 229
 230 static int lxt973_probe(struct phy_device *phydev)
 231 {
 232         int val = phy_read(phydev, MII_LXT973_PCR);
 233
 234         if (val & PCR_FIBER_SELECT) {
 235                 /*
 236                  * If fiber is selected, then the only correct setting
 237                  * is 100Mbps, full duplex, and auto negotiation off.
 238                  */
 239                 val = phy_read(phydev, MII_BMCR);
 240                 val |= (BMCR_SPEED100 | BMCR_FULLDPLX);
 241                 val &= ~BMCR_ANENABLE;
 242                 phy_write(phydev, MII_BMCR, val);
 243                 /* Remember that the port is in fiber mode. */
 244                 phydev->priv = lxt973_probe;
 245         } else {
 246                 phydev->priv = NULL;
 247         }
 248         return 0;
 249 }
 250
 251 static int lxt973_config_aneg(struct phy_device *phydev)
 252 {
 253         /* Do nothing if port is in fiber mode. */
 254         return phydev->priv ? 0 : genphy_config_aneg(phydev);
 255 }
 256
 257 static struct phy_driver lxt97x_driver[] = {
 258 {
 259         .phy_id         = 0x78100000,
 260         .name           = "LXT970",
 261         .phy_id_mask    = 0xfffffff0,
 262         .features       = PHY_BASIC_FEATURES,
 263         .flags          = PHY_HAS_INTERRUPT,
 264         .config_init    = lxt970_config_init,
 265         .config_aneg    = genphy_config_aneg,
 266         .read_status    = genphy_read_status,
 267         .ack_interrupt  = lxt970_ack_interrupt,
 268         .config_intr    = lxt970_config_intr,
 269 }, {
 270         .phy_id         = 0x001378e0,
 271         .name           = "LXT971",
 272         .phy_id_mask    = 0xfffffff0,
 273         .features       = PHY_BASIC_FEATURES,
 274         .flags          = PHY_HAS_INTERRUPT,
 275         .config_aneg    = genphy_config_aneg,
 276         .read_status    = genphy_read_status,
 277         .ack_interrupt  = lxt971_ack_interrupt,
 278         .config_intr    = lxt971_config_intr,
 279 }, {
 280         .phy_id         = 0x00137a10,
 281         .name           = "LXT973-A2",
 282         .phy_id_mask    = 0xffffffff,
 283         .features       = PHY_BASIC_FEATURES,
 284         .flags          = 0,
 285         .probe          = lxt973_probe,
 286         .config_aneg    = lxt973_config_aneg,
 287         .read_status    = lxt973a2_read_status,
 288 }, {
 289         .phy_id         = 0x00137a10,
 290         .name           = "LXT973",
 291         .phy_id_mask    = 0xfffffff0,
 292         .features       = PHY_BASIC_FEATURES,
 293         .flags          = 0,
 294         .probe          = lxt973_probe,
 295         .config_aneg    = lxt973_config_aneg,
 296         .read_status    = genphy_read_status,
 297 } };
 298
 299 module_phy_driver(lxt97x_driver);
 300
 301 static struct mdio_device_id __maybe_unused lxt_tbl[] = {
 302         { 0x78100000, 0xfffffff0 },
 303         { 0x001378e0, 0xfffffff0 },
 304         { 0x00137a10, 0xfffffff0 },
 305         { }
 306 };
 307
 308 MODULE_DEVICE_TABLE(mdio, lxt_tbl);