drivers/net/phy/smsc.c

   1 /*
   2  * drivers/net/phy/smsc.c
   3  *
   4  * Driver for SMSC PHYs
   5  *
   6  * Author: Herbert Valerio Riedel
   7  *
   8  * Copyright (c) 2006 Herbert Valerio Riedel <hvr@gnu.org>
   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  * Support added for SMSC LAN8187 and LAN8700 by steve.glendinning@shawell.net
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/mii.h>
  22 #include <linux/ethtool.h>
  23 #include <linux/of.h>
  24 #include <linux/phy.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/smscphy.h>
  27
  28 struct smsc_hw_stat {
  29         const char *string;
  30         u8 reg;
  31         u8 bits;
  32 };
  33
  34 static struct smsc_hw_stat smsc_hw_stats[] = {
  35         { "phy_symbol_errors", 26, 16},
  36 };
  37
  38 struct smsc_phy_priv {
  39         bool energy_enable;
  40 };
  41
  42 static int smsc_phy_config_intr(struct phy_device *phydev)
  43 {
  44         int rc = phy_write (phydev, MII_LAN83C185_IM,
  45                         ((PHY_INTERRUPT_ENABLED == phydev->interrupts)
  46                         ? MII_LAN83C185_ISF_INT_PHYLIB_EVENTS
  47                         : 0));
  48
  49         return rc < 0 ? rc : 0;
  50 }
  51
  52 static int smsc_phy_ack_interrupt(struct phy_device *phydev)
  53 {
  54         int rc = phy_read (phydev, MII_LAN83C185_ISF);
  55
  56         return rc < 0 ? rc : 0;
  57 }
  58
  59 static int smsc_phy_config_init(struct phy_device *phydev)
  60 {
  61         struct smsc_phy_priv *priv = phydev->priv;
  62
  63         int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
  64
  65         if (rc < 0)
  66                 return rc;
  67
  68         if (priv->energy_enable) {
  69                 /* Enable energy detect mode for this SMSC Transceivers */
  70                 rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
  71                                rc | MII_LAN83C185_EDPWRDOWN);
  72                 if (rc < 0)
  73                         return rc;
  74         }
  75
  76         return smsc_phy_ack_interrupt(phydev);
  77 }
  78
  79 static int smsc_phy_reset(struct phy_device *phydev)
  80 {
  81         int rc = phy_read(phydev, MII_LAN83C185_SPECIAL_MODES);
  82         if (rc < 0)
  83                 return rc;
  84
  85         /* If the SMSC PHY is in power down mode, then set it
  86          * in all capable mode before using it.
  87          */
  88         if ((rc & MII_LAN83C185_MODE_MASK) == MII_LAN83C185_MODE_POWERDOWN) {
  89                 /* set "all capable" mode */
  90                 rc |= MII_LAN83C185_MODE_ALL;
  91                 phy_write(phydev, MII_LAN83C185_SPECIAL_MODES, rc);
  92         }
  93
  94         /* reset the phy */
  95         return genphy_soft_reset(phydev);
  96 }
  97
  98 static int lan911x_config_init(struct phy_device *phydev)
  99 {
 100         return smsc_phy_ack_interrupt(phydev);
 101 }
 102
 103 /*
 104  * The LAN87xx suffers from rare absence of the ENERGYON-bit when Ethernet cable
 105  * plugs in while LAN87xx is in Energy Detect Power-Down mode. This leads to
 106  * unstable detection of plugging in Ethernet cable.
 107  * This workaround disables Energy Detect Power-Down mode and waiting for
 108  * response on link pulses to detect presence of plugged Ethernet cable.
 109  * The Energy Detect Power-Down mode is enabled again in the end of procedure to
 110  * save approximately 220 mW of power if cable is unplugged.
 111  */
 112 static int lan87xx_read_status(struct phy_device *phydev)
 113 {
 114         struct smsc_phy_priv *priv = phydev->priv;
 115
 116         int err = genphy_read_status(phydev);
 117
 118         if (!phydev->link && priv->energy_enable) {
 119                 int i;
 120
 121                 /* Disable EDPD to wake up PHY */
 122                 int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
 123                 if (rc < 0)
 124                         return rc;
 125
 126                 rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
 127                                rc & ~MII_LAN83C185_EDPWRDOWN);
 128                 if (rc < 0)
 129                         return rc;
 130
 131                 /* Wait max 640 ms to detect energy */
 132                 for (i = 0; i < 64; i++) {
 133                         /* Sleep to allow link test pulses to be sent */
 134                         msleep(10);
 135                         rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
 136                         if (rc < 0)
 137                                 return rc;
 138                         if (rc & MII_LAN83C185_ENERGYON)
 139                                 break;
 140                 }
 141
 142                 /* Re-enable EDPD */
 143                 rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
 144                 if (rc < 0)
 145                         return rc;
 146
 147                 rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
 148                                rc | MII_LAN83C185_EDPWRDOWN);
 149                 if (rc < 0)
 150                         return rc;
 151         }
 152
 153         return err;
 154 }
 155
 156 static int smsc_get_sset_count(struct phy_device *phydev)
 157 {
 158         return ARRAY_SIZE(smsc_hw_stats);
 159 }
 160
 161 static void smsc_get_strings(struct phy_device *phydev, u8 *data)
 162 {
 163         int i;
 164
 165         for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++) {
 166                 strncpy(data + i * ETH_GSTRING_LEN,
 167                        smsc_hw_stats[i].string, ETH_GSTRING_LEN);
 168         }
 169 }
 170
 171 static u64 smsc_get_stat(struct phy_device *phydev, int i)
 172 {
 173         struct smsc_hw_stat stat = smsc_hw_stats[i];
 174         int val;
 175         u64 ret;
 176
 177         val = phy_read(phydev, stat.reg);
 178         if (val < 0)
 179                 ret = U64_MAX;
 180         else
 181                 ret = val;
 182
 183         return ret;
 184 }
 185
 186 static void smsc_get_stats(struct phy_device *phydev,
 187                            struct ethtool_stats *stats, u64 *data)
 188 {
 189         int i;
 190
 191         for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++)
 192                 data[i] = smsc_get_stat(phydev, i);
 193 }
 194
 195 static int smsc_phy_probe(struct phy_device *phydev)
 196 {
 197         struct device *dev = &phydev->mdio.dev;
 198         struct device_node *of_node = dev->of_node;
 199         struct smsc_phy_priv *priv;
 200
 201         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 202         if (!priv)
 203                 return -ENOMEM;
 204
 205         priv->energy_enable = true;
 206
 207         if (of_property_read_bool(of_node, "smsc,disable-energy-detect"))
 208                 priv->energy_enable = false;
 209
 210         phydev->priv = priv;
 211
 212         return 0;
 213 }
 214
 215 static struct phy_driver smsc_phy_driver[] = {
 216 {
 217         .phy_id         = 0x0007c0a0, /* OUI=0x00800f, Model#=0x0a */
 218         .phy_id_mask    = 0xfffffff0,
 219         .name           = "SMSC LAN83C185",
 220
 221         .features       = PHY_BASIC_FEATURES,
 222         .flags          = PHY_HAS_INTERRUPT,
 223
 224         .probe          = smsc_phy_probe,
 225
 226         /* basic functions */
 227         .config_init    = smsc_phy_config_init,
 228         .soft_reset     = smsc_phy_reset,
 229
 230         /* IRQ related */
 231         .ack_interrupt  = smsc_phy_ack_interrupt,
 232         .config_intr    = smsc_phy_config_intr,
 233
 234         .suspend        = genphy_suspend,
 235         .resume         = genphy_resume,
 236 }, {
 237         .phy_id         = 0x0007c0b0, /* OUI=0x00800f, Model#=0x0b */
 238         .phy_id_mask    = 0xfffffff0,
 239         .name           = "SMSC LAN8187",
 240
 241         .features       = PHY_BASIC_FEATURES,
 242         .flags          = PHY_HAS_INTERRUPT,
 243
 244         .probe          = smsc_phy_probe,
 245
 246         /* basic functions */
 247         .config_init    = smsc_phy_config_init,
 248         .soft_reset     = smsc_phy_reset,
 249
 250         /* IRQ related */
 251         .ack_interrupt  = smsc_phy_ack_interrupt,
 252         .config_intr    = smsc_phy_config_intr,
 253
 254         /* Statistics */
 255         .get_sset_count = smsc_get_sset_count,
 256         .get_strings    = smsc_get_strings,
 257         .get_stats      = smsc_get_stats,
 258
 259         .suspend        = genphy_suspend,
 260         .resume         = genphy_resume,
 261 }, {
 262         .phy_id         = 0x0007c0c0, /* OUI=0x00800f, Model#=0x0c */
 263         .phy_id_mask    = 0xfffffff0,
 264         .name           = "SMSC LAN8700",
 265
 266         .features       = PHY_BASIC_FEATURES,
 267         .flags          = PHY_HAS_INTERRUPT,
 268
 269         .probe          = smsc_phy_probe,
 270
 271         /* basic functions */
 272         .read_status    = lan87xx_read_status,
 273         .config_init    = smsc_phy_config_init,
 274         .soft_reset     = smsc_phy_reset,
 275
 276         /* IRQ related */
 277         .ack_interrupt  = smsc_phy_ack_interrupt,
 278         .config_intr    = smsc_phy_config_intr,
 279
 280         /* Statistics */
 281         .get_sset_count = smsc_get_sset_count,
 282         .get_strings    = smsc_get_strings,
 283         .get_stats      = smsc_get_stats,
 284
 285         .suspend        = genphy_suspend,
 286         .resume         = genphy_resume,
 287 }, {
 288         .phy_id         = 0x0007c0d0, /* OUI=0x00800f, Model#=0x0d */
 289         .phy_id_mask    = 0xfffffff0,
 290         .name           = "SMSC LAN911x Internal PHY",
 291
 292         .features       = PHY_BASIC_FEATURES,
 293         .flags          = PHY_HAS_INTERRUPT,
 294
 295         .probe          = smsc_phy_probe,
 296
 297         /* basic functions */
 298         .config_init    = lan911x_config_init,
 299
 300         /* IRQ related */
 301         .ack_interrupt  = smsc_phy_ack_interrupt,
 302         .config_intr    = smsc_phy_config_intr,
 303
 304         .suspend        = genphy_suspend,
 305         .resume         = genphy_resume,
 306 }, {
 307         .phy_id         = 0x0007c0f0, /* OUI=0x00800f, Model#=0x0f */
 308         .phy_id_mask    = 0xfffffff0,
 309         .name           = "SMSC LAN8710/LAN8720",
 310
 311         .features       = PHY_BASIC_FEATURES,
 312         .flags          = PHY_HAS_INTERRUPT | PHY_RST_AFTER_CLK_EN,
 313
 314         .probe          = smsc_phy_probe,
 315
 316         /* basic functions */
 317         .read_status    = lan87xx_read_status,
 318         .config_init    = smsc_phy_config_init,
 319         .soft_reset     = smsc_phy_reset,
 320
 321         /* IRQ related */
 322         .ack_interrupt  = smsc_phy_ack_interrupt,
 323         .config_intr    = smsc_phy_config_intr,
 324
 325         /* Statistics */
 326         .get_sset_count = smsc_get_sset_count,
 327         .get_strings    = smsc_get_strings,
 328         .get_stats      = smsc_get_stats,
 329
 330         .suspend        = genphy_suspend,
 331         .resume         = genphy_resume,
 332 }, {
 333         .phy_id         = 0x0007c110,
 334         .phy_id_mask    = 0xfffffff0,
 335         .name           = "SMSC LAN8740",
 336
 337         .features       = PHY_BASIC_FEATURES,
 338         .flags          = PHY_HAS_INTERRUPT,
 339
 340         .probe          = smsc_phy_probe,
 341
 342         /* basic functions */
 343         .read_status    = lan87xx_read_status,
 344         .config_init    = smsc_phy_config_init,
 345         .soft_reset     = smsc_phy_reset,
 346
 347         /* IRQ related */
 348         .ack_interrupt  = smsc_phy_ack_interrupt,
 349         .config_intr    = smsc_phy_config_intr,
 350
 351         /* Statistics */
 352         .get_sset_count = smsc_get_sset_count,
 353         .get_strings    = smsc_get_strings,
 354         .get_stats      = smsc_get_stats,
 355
 356         .suspend        = genphy_suspend,
 357         .resume         = genphy_resume,
 358 } };
 359
 360 module_phy_driver(smsc_phy_driver);
 361
 362 MODULE_DESCRIPTION("SMSC PHY driver");
 363 MODULE_AUTHOR("Herbert Valerio Riedel");
 364 MODULE_LICENSE("GPL");
 365
 366 static struct mdio_device_id __maybe_unused smsc_tbl[] = {
 367         { 0x0007c0a0, 0xfffffff0 },
 368         { 0x0007c0b0, 0xfffffff0 },
 369         { 0x0007c0c0, 0xfffffff0 },
 370         { 0x0007c0d0, 0xfffffff0 },
 371         { 0x0007c0f0, 0xfffffff0 },
 372         { 0x0007c110, 0xfffffff0 },
 373         { }
 374 };
 375
 376 MODULE_DEVICE_TABLE(mdio, smsc_tbl);