drivers/net/ibm_emac/ibm_emac_phy.c

   1 /*
   2  * drivers/net/ibm_emac/ibm_emac_phy.c
   3  *
   4  * Driver for PowerPC 4xx on-chip ethernet controller, PHY support.
   5  * Borrowed from sungem_phy.c, though I only kept the generic MII
   6  * driver for now.
   7  *
   8  * This file should be shared with other drivers or eventually
   9  * merged as the "low level" part of miilib
  10  *
  11  * (c) 2003, Benjamin Herrenscmidt (benh@kernel.crashing.org)
  12  * (c) 2004-2005, Eugene Surovegin <ebs@ebshome.net>
  13  *
  14  */
  15 #include <linux/config.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/mii.h>
  21 #include <linux/ethtool.h>
  22 #include <linux/delay.h>
  23
  24 #include <asm/ocp.h>
  25
  26 #include "ibm_emac_phy.h"
  27
  28 static inline int phy_read(struct mii_phy *phy, int reg)
  29 {
  30         return phy->mdio_read(phy->dev, phy->address, reg);
  31 }
  32
  33 static inline void phy_write(struct mii_phy *phy, int reg, int val)
  34 {
  35         phy->mdio_write(phy->dev, phy->address, reg, val);
  36 }
  37
  38 int mii_reset_phy(struct mii_phy *phy)
  39 {
  40         int val;
  41         int limit = 10000;
  42
  43         val = phy_read(phy, MII_BMCR);
  44         val &= ~BMCR_ISOLATE;
  45         val |= BMCR_RESET;
  46         phy_write(phy, MII_BMCR, val);
  47
  48         udelay(300);
  49
  50         while (limit--) {
  51                 val = phy_read(phy, MII_BMCR);
  52                 if (val >= 0 && (val & BMCR_RESET) == 0)
  53                         break;
  54                 udelay(10);
  55         }
  56         if ((val & BMCR_ISOLATE) && limit > 0)
  57                 phy_write(phy, MII_BMCR, val & ~BMCR_ISOLATE);
  58
  59         return limit <= 0;
  60 }
  61
  62 static int genmii_setup_aneg(struct mii_phy *phy, u32 advertise)
  63 {
  64         int ctl, adv;
  65
  66         phy->autoneg = AUTONEG_ENABLE;
  67         phy->speed = SPEED_10;
  68         phy->duplex = DUPLEX_HALF;
  69         phy->pause = phy->asym_pause = 0;
  70         phy->advertising = advertise;
  71
  72         /* Setup standard advertise */
  73         adv = phy_read(phy, MII_ADVERTISE);
  74         if (adv < 0)
  75                 return adv;
  76         adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
  77                  ADVERTISE_PAUSE_ASYM);
  78         if (advertise & ADVERTISED_10baseT_Half)
  79                 adv |= ADVERTISE_10HALF;
  80         if (advertise & ADVERTISED_10baseT_Full)
  81                 adv |= ADVERTISE_10FULL;
  82         if (advertise & ADVERTISED_100baseT_Half)
  83                 adv |= ADVERTISE_100HALF;
  84         if (advertise & ADVERTISED_100baseT_Full)
  85                 adv |= ADVERTISE_100FULL;
  86         if (advertise & ADVERTISED_Pause)
  87                 adv |= ADVERTISE_PAUSE_CAP;
  88         if (advertise & ADVERTISED_Asym_Pause)
  89                 adv |= ADVERTISE_PAUSE_ASYM;
  90         phy_write(phy, MII_ADVERTISE, adv);
  91
  92         if (phy->features &
  93             (SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half)) {
  94                 adv = phy_read(phy, MII_CTRL1000);
  95                 if (adv < 0)
  96                         return adv;
  97                 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
  98                 if (advertise & ADVERTISED_1000baseT_Full)
  99                         adv |= ADVERTISE_1000FULL;
 100                 if (advertise & ADVERTISED_1000baseT_Half)
 101                         adv |= ADVERTISE_1000HALF;
 102                 phy_write(phy, MII_CTRL1000, adv);
 103         }
 104
 105         /* Start/Restart aneg */
 106         ctl = phy_read(phy, MII_BMCR);
 107         ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
 108         phy_write(phy, MII_BMCR, ctl);
 109
 110         return 0;
 111 }
 112
 113 static int genmii_setup_forced(struct mii_phy *phy, int speed, int fd)
 114 {
 115         int ctl;
 116
 117         phy->autoneg = AUTONEG_DISABLE;
 118         phy->speed = speed;
 119         phy->duplex = fd;
 120         phy->pause = phy->asym_pause = 0;
 121
 122         ctl = phy_read(phy, MII_BMCR);
 123         if (ctl < 0)
 124                 return ctl;
 125         ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_ANENABLE);
 126
 127         /* First reset the PHY */
 128         phy_write(phy, MII_BMCR, ctl | BMCR_RESET);
 129
 130         /* Select speed & duplex */
 131         switch (speed) {
 132         case SPEED_10:
 133                 break;
 134         case SPEED_100:
 135                 ctl |= BMCR_SPEED100;
 136                 break;
 137         case SPEED_1000:
 138                 ctl |= BMCR_SPEED1000;
 139                 break;
 140         default:
 141                 return -EINVAL;
 142         }
 143         if (fd == DUPLEX_FULL)
 144                 ctl |= BMCR_FULLDPLX;
 145         phy_write(phy, MII_BMCR, ctl);
 146
 147         return 0;
 148 }
 149
 150 static int genmii_poll_link(struct mii_phy *phy)
 151 {
 152         int status;
 153
 154         /* Clear latched value with dummy read */
 155         phy_read(phy, MII_BMSR);
 156         status = phy_read(phy, MII_BMSR);
 157         if (status < 0 || (status & BMSR_LSTATUS) == 0)
 158                 return 0;
 159         if (phy->autoneg == AUTONEG_ENABLE && !(status & BMSR_ANEGCOMPLETE))
 160                 return 0;
 161         return 1;
 162 }
 163
 164 static int genmii_read_link(struct mii_phy *phy)
 165 {
 166         if (phy->autoneg == AUTONEG_ENABLE) {
 167                 int glpa = 0;
 168                 int lpa = phy_read(phy, MII_LPA) & phy_read(phy, MII_ADVERTISE);
 169                 if (lpa < 0)
 170                         return lpa;
 171
 172                 if (phy->features &
 173                     (SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half)) {
 174                         int adv = phy_read(phy, MII_CTRL1000);
 175                         glpa = phy_read(phy, MII_STAT1000);
 176
 177                         if (glpa < 0 || adv < 0)
 178                                 return adv;
 179
 180                         glpa &= adv << 2;
 181                 }
 182
 183                 phy->speed = SPEED_10;
 184                 phy->duplex = DUPLEX_HALF;
 185                 phy->pause = phy->asym_pause = 0;
 186
 187                 if (glpa & (LPA_1000FULL | LPA_1000HALF)) {
 188                         phy->speed = SPEED_1000;
 189                         if (glpa & LPA_1000FULL)
 190                                 phy->duplex = DUPLEX_FULL;
 191                 } else if (lpa & (LPA_100FULL | LPA_100HALF)) {
 192                         phy->speed = SPEED_100;
 193                         if (lpa & LPA_100FULL)
 194                                 phy->duplex = DUPLEX_FULL;
 195                 } else if (lpa & LPA_10FULL)
 196                         phy->duplex = DUPLEX_FULL;
 197
 198                 if (phy->duplex == DUPLEX_FULL) {
 199                         phy->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
 200                         phy->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
 201                 }
 202         } else {
 203                 int bmcr = phy_read(phy, MII_BMCR);
 204                 if (bmcr < 0)
 205                         return bmcr;
 206
 207                 if (bmcr & BMCR_FULLDPLX)
 208                         phy->duplex = DUPLEX_FULL;
 209                 else
 210                         phy->duplex = DUPLEX_HALF;
 211                 if (bmcr & BMCR_SPEED1000)
 212                         phy->speed = SPEED_1000;
 213                 else if (bmcr & BMCR_SPEED100)
 214                         phy->speed = SPEED_100;
 215                 else
 216                         phy->speed = SPEED_10;
 217
 218                 phy->pause = phy->asym_pause = 0;
 219         }
 220         return 0;
 221 }
 222
 223 /* Generic implementation for most 10/100/1000 PHYs */
 224 static struct mii_phy_ops generic_phy_ops = {
 225         .setup_aneg     = genmii_setup_aneg,
 226         .setup_forced   = genmii_setup_forced,
 227         .poll_link      = genmii_poll_link,
 228         .read_link      = genmii_read_link
 229 };
 230
 231 static struct mii_phy_def genmii_phy_def = {
 232         .phy_id         = 0x00000000,
 233         .phy_id_mask    = 0x00000000,
 234         .name           = "Generic MII",
 235         .ops            = &generic_phy_ops
 236 };
 237
 238 /* CIS8201 */
 239 #define MII_CIS8201_EPCR        0x17
 240 #define  EPCR_MODE_MASK         0x3000
 241 #define  EPCR_GMII_MODE         0x0000
 242 #define  EPCR_RGMII_MODE        0x1000
 243 #define  EPCR_TBI_MODE          0x2000
 244 #define  EPCR_RTBI_MODE         0x3000
 245
 246 static int cis8201_init(struct mii_phy *phy)
 247 {
 248         int epcr;
 249
 250         epcr = phy_read(phy, MII_CIS8201_EPCR);
 251         if (epcr < 0)
 252                 return epcr;
 253
 254         epcr &= ~EPCR_MODE_MASK;
 255
 256         switch (phy->mode) {
 257         case PHY_MODE_TBI:
 258                 epcr |= EPCR_TBI_MODE;
 259                 break;
 260         case PHY_MODE_RTBI:
 261                 epcr |= EPCR_RTBI_MODE;
 262                 break;
 263         case PHY_MODE_GMII:
 264                 epcr |= EPCR_GMII_MODE;
 265                 break;
 266         case PHY_MODE_RGMII:
 267         default:
 268                 epcr |= EPCR_RGMII_MODE;
 269         }
 270
 271         phy_write(phy, MII_CIS8201_EPCR, epcr);
 272
 273         return 0;
 274 }
 275
 276 static struct mii_phy_ops cis8201_phy_ops = {
 277         .init           = cis8201_init,
 278         .setup_aneg     = genmii_setup_aneg,
 279         .setup_forced   = genmii_setup_forced,
 280         .poll_link      = genmii_poll_link,
 281         .read_link      = genmii_read_link
 282 };
 283
 284 static struct mii_phy_def cis8201_phy_def = {
 285         .phy_id         = 0x000fc410,
 286         .phy_id_mask    = 0x000ffff0,
 287         .name           = "CIS8201 Gigabit Ethernet",
 288         .ops            = &cis8201_phy_ops
 289 };
 290
 291 static struct mii_phy_def *mii_phy_table[] = {
 292         &cis8201_phy_def,
 293         &genmii_phy_def,
 294         NULL
 295 };
 296
 297 int mii_phy_probe(struct mii_phy *phy, int address)
 298 {
 299         struct mii_phy_def *def;
 300         int i;
 301         u32 id;
 302
 303         phy->autoneg = AUTONEG_DISABLE;
 304         phy->advertising = 0;
 305         phy->address = address;
 306         phy->speed = SPEED_10;
 307         phy->duplex = DUPLEX_HALF;
 308         phy->pause = phy->asym_pause = 0;
 309
 310         /* Take PHY out of isolate mode and reset it. */
 311         if (mii_reset_phy(phy))
 312                 return -ENODEV;
 313
 314         /* Read ID and find matching entry */
 315         id = (phy_read(phy, MII_PHYSID1) << 16) | phy_read(phy, MII_PHYSID2);
 316         for (i = 0; (def = mii_phy_table[i]) != NULL; i++)
 317                 if ((id & def->phy_id_mask) == def->phy_id)
 318                         break;
 319         /* Should never be NULL (we have a generic entry), but... */
 320         if (!def)
 321                 return -ENODEV;
 322
 323         phy->def = def;
 324
 325         /* Determine PHY features if needed */
 326         phy->features = def->features;
 327         if (!phy->features) {
 328                 u16 bmsr = phy_read(phy, MII_BMSR);
 329                 if (bmsr & BMSR_ANEGCAPABLE)
 330                         phy->features |= SUPPORTED_Autoneg;
 331                 if (bmsr & BMSR_10HALF)
 332                         phy->features |= SUPPORTED_10baseT_Half;
 333                 if (bmsr & BMSR_10FULL)
 334                         phy->features |= SUPPORTED_10baseT_Full;
 335                 if (bmsr & BMSR_100HALF)
 336                         phy->features |= SUPPORTED_100baseT_Half;
 337                 if (bmsr & BMSR_100FULL)
 338                         phy->features |= SUPPORTED_100baseT_Full;
 339                 if (bmsr & BMSR_ESTATEN) {
 340                         u16 esr = phy_read(phy, MII_ESTATUS);
 341                         if (esr & ESTATUS_1000_TFULL)
 342                                 phy->features |= SUPPORTED_1000baseT_Full;
 343                         if (esr & ESTATUS_1000_THALF)
 344                                 phy->features |= SUPPORTED_1000baseT_Half;
 345                 }
 346                 phy->features |= SUPPORTED_MII;
 347         }
 348
 349         /* Setup default advertising */
 350         phy->advertising = phy->features;
 351
 352         return 0;
 353 }
 354
 355 MODULE_LICENSE("GPL");