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 <asm/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         int err;
  84
  85         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
  86                 err = phy_write(phydev, MII_LXT970_IER, MII_LXT970_IER_IEN);
  87         else
  88                 err = phy_write(phydev, MII_LXT970_IER, 0);
  89
  90         return err;
  91 }
  92
  93 static int lxt970_config_init(struct phy_device *phydev)
  94 {
  95         int err;
  96
  97         err = phy_write(phydev, MII_LXT970_CONFIG, 0);
  98
  99         return err;
 100 }
 101
 102
 103 static int lxt971_ack_interrupt(struct phy_device *phydev)
 104 {
 105         int err = phy_read(phydev, MII_LXT971_ISR);
 106
 107         if (err < 0)
 108                 return err;
 109
 110         return 0;
 111 }
 112
 113 static int lxt971_config_intr(struct phy_device *phydev)
 114 {
 115         int err;
 116
 117         if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
 118                 err = phy_write(phydev, MII_LXT971_IER, MII_LXT971_IER_IEN);
 119         else
 120                 err = phy_write(phydev, MII_LXT971_IER, 0);
 121
 122         return err;
 123 }
 124
 125 /*
 126  * A2 version of LXT973 chip has an ERRATA: it randomly return the contents
 127  * of the previous even register when you read a odd register regularly
 128  */
 129
 130 static int lxt973a2_update_link(struct phy_device *phydev)
 131 {
 132         int status;
 133         int control;
 134         int retry = 8; /* we try 8 times */
 135
 136         /* Do a fake read */
 137         status = phy_read(phydev, MII_BMSR);
 138
 139         if (status < 0)
 140                 return status;
 141
 142         control = phy_read(phydev, MII_BMCR);
 143         if (control < 0)
 144                 return control;
 145
 146         do {
 147                 /* Read link and autonegotiation status */
 148                 status = phy_read(phydev, MII_BMSR);
 149         } while (status >= 0 && retry-- && status == control);
 150
 151         if (status < 0)
 152                 return status;
 153
 154         if ((status & BMSR_LSTATUS) == 0)
 155                 phydev->link = 0;
 156         else
 157                 phydev->link = 1;
 158
 159         return 0;
 160 }
 161
 162 static int lxt973a2_read_status(struct phy_device *phydev)
 163 {
 164         int adv;
 165         int err;
 166         int lpa;
 167         int lpagb = 0;
 168
 169         /* Update the link, but return if there was an error */
 170         err = lxt973a2_update_link(phydev);
 171         if (err)
 172                 return err;
 173
 174         if (AUTONEG_ENABLE == phydev->autoneg) {
 175                 int retry = 1;
 176
 177                 adv = phy_read(phydev, MII_ADVERTISE);
 178
 179                 if (adv < 0)
 180                         return adv;
 181
 182                 do {
 183                         lpa = phy_read(phydev, MII_LPA);
 184
 185                         if (lpa < 0)
 186                                 return lpa;
 187
 188                         /* If both registers are equal, it is suspect but not
 189                         * impossible, hence a new try
 190                         */
 191                 } while (lpa == adv && retry--);
 192
 193                 lpa &= adv;
 194
 195                 phydev->speed = SPEED_10;
 196                 phydev->duplex = DUPLEX_HALF;
 197                 phydev->pause = phydev->asym_pause = 0;
 198
 199                 if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {
 200                         phydev->speed = SPEED_1000;
 201
 202                         if (lpagb & LPA_1000FULL)
 203                                 phydev->duplex = DUPLEX_FULL;
 204                 } else if (lpa & (LPA_100FULL | LPA_100HALF)) {
 205                         phydev->speed = SPEED_100;
 206
 207                         if (lpa & LPA_100FULL)
 208                                 phydev->duplex = DUPLEX_FULL;
 209                 } else {
 210                         if (lpa & LPA_10FULL)
 211                                 phydev->duplex = DUPLEX_FULL;
 212                 }
 213
 214                 if (phydev->duplex == DUPLEX_FULL) {
 215                         phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
 216                         phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
 217                 }
 218         } else {
 219                 int bmcr = phy_read(phydev, MII_BMCR);
 220
 221                 if (bmcr < 0)
 222                         return bmcr;
 223
 224                 if (bmcr & BMCR_FULLDPLX)
 225                         phydev->duplex = DUPLEX_FULL;
 226                 else
 227                         phydev->duplex = DUPLEX_HALF;
 228
 229                 if (bmcr & BMCR_SPEED1000)
 230                         phydev->speed = SPEED_1000;
 231                 else if (bmcr & BMCR_SPEED100)
 232                         phydev->speed = SPEED_100;
 233                 else
 234                         phydev->speed = SPEED_10;
 235
 236                 phydev->pause = phydev->asym_pause = 0;
 237         }
 238
 239         return 0;
 240 }
 241
 242 static int lxt973_probe(struct phy_device *phydev)
 243 {
 244         int val = phy_read(phydev, MII_LXT973_PCR);
 245
 246         if (val & PCR_FIBER_SELECT) {
 247                 /*
 248                  * If fiber is selected, then the only correct setting
 249                  * is 100Mbps, full duplex, and auto negotiation off.
 250                  */
 251                 val = phy_read(phydev, MII_BMCR);
 252                 val |= (BMCR_SPEED100 | BMCR_FULLDPLX);
 253                 val &= ~BMCR_ANENABLE;
 254                 phy_write(phydev, MII_BMCR, val);
 255                 /* Remember that the port is in fiber mode. */
 256                 phydev->priv = lxt973_probe;
 257         } else {
 258                 phydev->priv = NULL;
 259         }
 260         return 0;
 261 }
 262
 263 static int lxt973_config_aneg(struct phy_device *phydev)
 264 {
 265         /* Do nothing if port is in fiber mode. */
 266         return phydev->priv ? 0 : genphy_config_aneg(phydev);
 267 }
 268
 269 static struct phy_driver lxt97x_driver[] = {
 270 {
 271         .phy_id         = 0x78100000,
 272         .name           = "LXT970",
 273         .phy_id_mask    = 0xfffffff0,
 274         .features       = PHY_BASIC_FEATURES,
 275         .flags          = PHY_HAS_INTERRUPT,
 276         .config_init    = lxt970_config_init,
 277         .config_aneg    = genphy_config_aneg,
 278         .read_status    = genphy_read_status,
 279         .ack_interrupt  = lxt970_ack_interrupt,
 280         .config_intr    = lxt970_config_intr,
 281         .driver         = { .owner = THIS_MODULE,},
 282 }, {
 283         .phy_id         = 0x001378e0,
 284         .name           = "LXT971",
 285         .phy_id_mask    = 0xfffffff0,
 286         .features       = PHY_BASIC_FEATURES,
 287         .flags          = PHY_HAS_INTERRUPT,
 288         .config_aneg    = genphy_config_aneg,
 289         .read_status    = genphy_read_status,
 290         .ack_interrupt  = lxt971_ack_interrupt,
 291         .config_intr    = lxt971_config_intr,
 292         .driver         = { .owner = THIS_MODULE,},
 293 }, {
 294         .phy_id         = 0x00137a10,
 295         .name           = "LXT973-A2",
 296         .phy_id_mask    = 0xffffffff,
 297         .features       = PHY_BASIC_FEATURES,
 298         .flags          = 0,
 299         .probe          = lxt973_probe,
 300         .config_aneg    = lxt973_config_aneg,
 301         .read_status    = lxt973a2_read_status,
 302         .driver         = { .owner = THIS_MODULE,},
 303 }, {
 304         .phy_id         = 0x00137a10,
 305         .name           = "LXT973",
 306         .phy_id_mask    = 0xfffffff0,
 307         .features       = PHY_BASIC_FEATURES,
 308         .flags          = 0,
 309         .probe          = lxt973_probe,
 310         .config_aneg    = lxt973_config_aneg,
 311         .read_status    = genphy_read_status,
 312         .driver         = { .owner = THIS_MODULE,},
 313 } };
 314
 315 module_phy_driver(lxt97x_driver);
 316
 317 static struct mdio_device_id __maybe_unused lxt_tbl[] = {
 318         { 0x78100000, 0xfffffff0 },
 319         { 0x001378e0, 0xfffffff0 },
 320         { 0x00137a10, 0xfffffff0 },
 321         { }
 322 };
 323
 324 MODULE_DEVICE_TABLE(mdio, lxt_tbl);