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
 156         /* Update the link, but return if there was an error */
 157         err = lxt973a2_update_link(phydev);
 158         if (err)
 159                 return err;
 160
 161         if (AUTONEG_ENABLE == phydev->autoneg) {
 162                 int retry = 1;
 163
 164                 adv = phy_read(phydev, MII_ADVERTISE);
 165
 166                 if (adv < 0)
 167                         return adv;
 168
 169                 do {
 170                         lpa = phy_read(phydev, MII_LPA);
 171
 172                         if (lpa < 0)
 173                                 return lpa;
 174
 175                         /* If both registers are equal, it is suspect but not
 176                         * impossible, hence a new try
 177                         */
 178                 } while (lpa == adv && retry--);
 179
 180                 phydev->lp_advertising = mii_lpa_to_ethtool_lpa_t(lpa);
 181
 182                 lpa &= adv;
 183
 184                 phydev->speed = SPEED_10;
 185                 phydev->duplex = DUPLEX_HALF;
 186                 phydev->pause = phydev->asym_pause = 0;
 187
 188                 if (lpa & (LPA_100FULL | LPA_100HALF)) {
 189                         phydev->speed = SPEED_100;
 190
 191                         if (lpa & LPA_100FULL)
 192                                 phydev->duplex = DUPLEX_FULL;
 193                 } else {
 194                         if (lpa & LPA_10FULL)
 195                                 phydev->duplex = DUPLEX_FULL;
 196                 }
 197
 198                 if (phydev->duplex == DUPLEX_FULL) {
 199                         phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
 200                         phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
 201                 }
 202         } else {
 203                 int bmcr = phy_read(phydev, MII_BMCR);
 204
 205                 if (bmcr < 0)
 206                         return bmcr;
 207
 208                 if (bmcr & BMCR_FULLDPLX)
 209                         phydev->duplex = DUPLEX_FULL;
 210                 else
 211                         phydev->duplex = DUPLEX_HALF;
 212
 213                 if (bmcr & BMCR_SPEED1000)
 214                         phydev->speed = SPEED_1000;
 215                 else if (bmcr & BMCR_SPEED100)
 216                         phydev->speed = SPEED_100;
 217                 else
 218                         phydev->speed = SPEED_10;
 219
 220                 phydev->pause = phydev->asym_pause = 0;
 221                 phydev->lp_advertising = 0;
 222         }
 223
 224         return 0;
 225 }
 226
 227 static int lxt973_probe(struct phy_device *phydev)
 228 {
 229         int val = phy_read(phydev, MII_LXT973_PCR);
 230
 231         if (val & PCR_FIBER_SELECT) {
 232                 /*
 233                  * If fiber is selected, then the only correct setting
 234                  * is 100Mbps, full duplex, and auto negotiation off.
 235                  */
 236                 val = phy_read(phydev, MII_BMCR);
 237                 val |= (BMCR_SPEED100 | BMCR_FULLDPLX);
 238                 val &= ~BMCR_ANENABLE;
 239                 phy_write(phydev, MII_BMCR, val);
 240                 /* Remember that the port is in fiber mode. */
 241                 phydev->priv = lxt973_probe;
 242         } else {
 243                 phydev->priv = NULL;
 244         }
 245         return 0;
 246 }
 247
 248 static int lxt973_config_aneg(struct phy_device *phydev)
 249 {
 250         /* Do nothing if port is in fiber mode. */
 251         return phydev->priv ? 0 : genphy_config_aneg(phydev);
 252 }
 253
 254 static struct phy_driver lxt97x_driver[] = {
 255 {
 256         .phy_id         = 0x78100000,
 257         .name           = "LXT970",
 258         .phy_id_mask    = 0xfffffff0,
 259         .features       = PHY_BASIC_FEATURES,
 260         .flags          = PHY_HAS_INTERRUPT,
 261         .config_init    = lxt970_config_init,
 262         .ack_interrupt  = lxt970_ack_interrupt,
 263         .config_intr    = lxt970_config_intr,
 264 }, {
 265         .phy_id         = 0x001378e0,
 266         .name           = "LXT971",
 267         .phy_id_mask    = 0xfffffff0,
 268         .features       = PHY_BASIC_FEATURES,
 269         .flags          = PHY_HAS_INTERRUPT,
 270         .ack_interrupt  = lxt971_ack_interrupt,
 271         .config_intr    = lxt971_config_intr,
 272 }, {
 273         .phy_id         = 0x00137a10,
 274         .name           = "LXT973-A2",
 275         .phy_id_mask    = 0xffffffff,
 276         .features       = PHY_BASIC_FEATURES,
 277         .flags          = 0,
 278         .probe          = lxt973_probe,
 279         .config_aneg    = lxt973_config_aneg,
 280         .read_status    = lxt973a2_read_status,
 281 }, {
 282         .phy_id         = 0x00137a10,
 283         .name           = "LXT973",
 284         .phy_id_mask    = 0xfffffff0,
 285         .features       = PHY_BASIC_FEATURES,
 286         .flags          = 0,
 287         .probe          = lxt973_probe,
 288         .config_aneg    = lxt973_config_aneg,
 289 } };
 290
 291 module_phy_driver(lxt97x_driver);
 292
 293 static struct mdio_device_id __maybe_unused lxt_tbl[] = {
 294         { 0x78100000, 0xfffffff0 },
 295         { 0x001378e0, 0xfffffff0 },
 296         { 0x00137a10, 0xfffffff0 },
 297         { }
 298 };
 299
 300 MODULE_DEVICE_TABLE(mdio, lxt_tbl);