drivers/net/ethernet/ibm/emac/phy.c

   1 /*
   2  * drivers/net/ethernet/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  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
  12  *                <benh@kernel.crashing.org>
  13  *
  14  * Based on the arch/ppc version of the driver:
  15  *
  16  * (c) 2003, Benjamin Herrenscmidt (benh@kernel.crashing.org)
  17  * (c) 2004-2005, Eugene Surovegin <ebs@ebshome.net>
  18  *
  19  */
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/types.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/mii.h>
  25 #include <linux/ethtool.h>
  26 #include <linux/delay.h>
  27
  28 #include "emac.h"
  29 #include "phy.h"
  30
  31 #define phy_read _phy_read
  32 #define phy_write _phy_write
  33
  34 static inline int _phy_read(struct mii_phy *phy, int reg)
  35 {
  36         return phy->mdio_read(phy->dev, phy->address, reg);
  37 }
  38
  39 static inline void _phy_write(struct mii_phy *phy, int reg, int val)
  40 {
  41         phy->mdio_write(phy->dev, phy->address, reg, val);
  42 }
  43
  44 static inline int gpcs_phy_read(struct mii_phy *phy, int reg)
  45 {
  46         return phy->mdio_read(phy->dev, phy->gpcs_address, reg);
  47 }
  48
  49 static inline void gpcs_phy_write(struct mii_phy *phy, int reg, int val)
  50 {
  51         phy->mdio_write(phy->dev, phy->gpcs_address, reg, val);
  52 }
  53
  54 int emac_mii_reset_phy(struct mii_phy *phy)
  55 {
  56         int val;
  57         int limit = 10000;
  58
  59         val = phy_read(phy, MII_BMCR);
  60         val &= ~(BMCR_ISOLATE | BMCR_ANENABLE);
  61         val |= BMCR_RESET;
  62         phy_write(phy, MII_BMCR, val);
  63
  64         udelay(300);
  65
  66         while (--limit) {
  67                 val = phy_read(phy, MII_BMCR);
  68                 if (val >= 0 && (val & BMCR_RESET) == 0)
  69                         break;
  70                 udelay(10);
  71         }
  72         if ((val & BMCR_ISOLATE) && limit > 0)
  73                 phy_write(phy, MII_BMCR, val & ~BMCR_ISOLATE);
  74
  75         return limit <= 0;
  76 }
  77
  78 int emac_mii_reset_gpcs(struct mii_phy *phy)
  79 {
  80         int val;
  81         int limit = 10000;
  82
  83         val = gpcs_phy_read(phy, MII_BMCR);
  84         val &= ~(BMCR_ISOLATE | BMCR_ANENABLE);
  85         val |= BMCR_RESET;
  86         gpcs_phy_write(phy, MII_BMCR, val);
  87
  88         udelay(300);
  89
  90         while (--limit) {
  91                 val = gpcs_phy_read(phy, MII_BMCR);
  92                 if (val >= 0 && (val & BMCR_RESET) == 0)
  93                         break;
  94                 udelay(10);
  95         }
  96         if ((val & BMCR_ISOLATE) && limit > 0)
  97                 gpcs_phy_write(phy, MII_BMCR, val & ~BMCR_ISOLATE);
  98
  99         if (limit > 0 && phy->mode == PHY_MODE_SGMII) {
 100                 /* Configure GPCS interface to recommended setting for SGMII */
 101                 gpcs_phy_write(phy, 0x04, 0x8120); /* AsymPause, FDX */
 102                 gpcs_phy_write(phy, 0x07, 0x2801); /* msg_pg, toggle */
 103                 gpcs_phy_write(phy, 0x00, 0x0140); /* 1Gbps, FDX     */
 104         }
 105
 106         return limit <= 0;
 107 }
 108
 109 static int genmii_setup_aneg(struct mii_phy *phy, u32 advertise)
 110 {
 111         int ctl, adv;
 112
 113         phy->autoneg = AUTONEG_ENABLE;
 114         phy->speed = SPEED_10;
 115         phy->duplex = DUPLEX_HALF;
 116         phy->pause = phy->asym_pause = 0;
 117         phy->advertising = advertise;
 118
 119         ctl = phy_read(phy, MII_BMCR);
 120         if (ctl < 0)
 121                 return ctl;
 122         ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_SPEED1000 | BMCR_ANENABLE);
 123
 124         /* First clear the PHY */
 125         phy_write(phy, MII_BMCR, ctl);
 126
 127         /* Setup standard advertise */
 128         adv = phy_read(phy, MII_ADVERTISE);
 129         if (adv < 0)
 130                 return adv;
 131         adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
 132                  ADVERTISE_PAUSE_ASYM);
 133         if (advertise & ADVERTISED_10baseT_Half)
 134                 adv |= ADVERTISE_10HALF;
 135         if (advertise & ADVERTISED_10baseT_Full)
 136                 adv |= ADVERTISE_10FULL;
 137         if (advertise & ADVERTISED_100baseT_Half)
 138                 adv |= ADVERTISE_100HALF;
 139         if (advertise & ADVERTISED_100baseT_Full)
 140                 adv |= ADVERTISE_100FULL;
 141         if (advertise & ADVERTISED_Pause)
 142                 adv |= ADVERTISE_PAUSE_CAP;
 143         if (advertise & ADVERTISED_Asym_Pause)
 144                 adv |= ADVERTISE_PAUSE_ASYM;
 145         phy_write(phy, MII_ADVERTISE, adv);
 146
 147         if (phy->features &
 148             (SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half)) {
 149                 adv = phy_read(phy, MII_CTRL1000);
 150                 if (adv < 0)
 151                         return adv;
 152                 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
 153                 if (advertise & ADVERTISED_1000baseT_Full)
 154                         adv |= ADVERTISE_1000FULL;
 155                 if (advertise & ADVERTISED_1000baseT_Half)
 156                         adv |= ADVERTISE_1000HALF;
 157                 phy_write(phy, MII_CTRL1000, adv);
 158         }
 159
 160         /* Start/Restart aneg */
 161         ctl = phy_read(phy, MII_BMCR);
 162         ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
 163         phy_write(phy, MII_BMCR, ctl);
 164
 165         return 0;
 166 }
 167
 168 static int genmii_setup_forced(struct mii_phy *phy, int speed, int fd)
 169 {
 170         int ctl;
 171
 172         phy->autoneg = AUTONEG_DISABLE;
 173         phy->speed = speed;
 174         phy->duplex = fd;
 175         phy->pause = phy->asym_pause = 0;
 176
 177         ctl = phy_read(phy, MII_BMCR);
 178         if (ctl < 0)
 179                 return ctl;
 180         ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_SPEED1000 | BMCR_ANENABLE);
 181
 182         /* First clear the PHY */
 183         phy_write(phy, MII_BMCR, ctl | BMCR_RESET);
 184
 185         /* Select speed & duplex */
 186         switch (speed) {
 187         case SPEED_10:
 188                 break;
 189         case SPEED_100:
 190                 ctl |= BMCR_SPEED100;
 191                 break;
 192         case SPEED_1000:
 193                 ctl |= BMCR_SPEED1000;
 194                 break;
 195         default:
 196                 return -EINVAL;
 197         }
 198         if (fd == DUPLEX_FULL)
 199                 ctl |= BMCR_FULLDPLX;
 200         phy_write(phy, MII_BMCR, ctl);
 201
 202         return 0;
 203 }
 204
 205 static int genmii_poll_link(struct mii_phy *phy)
 206 {
 207         int status;
 208
 209         /* Clear latched value with dummy read */
 210         phy_read(phy, MII_BMSR);
 211         status = phy_read(phy, MII_BMSR);
 212         if (status < 0 || (status & BMSR_LSTATUS) == 0)
 213                 return 0;
 214         if (phy->autoneg == AUTONEG_ENABLE && !(status & BMSR_ANEGCOMPLETE))
 215                 return 0;
 216         return 1;
 217 }
 218
 219 static int genmii_read_link(struct mii_phy *phy)
 220 {
 221         if (phy->autoneg == AUTONEG_ENABLE) {
 222                 int glpa = 0;
 223                 int lpa = phy_read(phy, MII_LPA) & phy_read(phy, MII_ADVERTISE);
 224                 if (lpa < 0)
 225                         return lpa;
 226
 227                 if (phy->features &
 228                     (SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half)) {
 229                         int adv = phy_read(phy, MII_CTRL1000);
 230                         glpa = phy_read(phy, MII_STAT1000);
 231
 232                         if (glpa < 0 || adv < 0)
 233                                 return adv;
 234
 235                         glpa &= adv << 2;
 236                 }
 237
 238                 phy->speed = SPEED_10;
 239                 phy->duplex = DUPLEX_HALF;
 240                 phy->pause = phy->asym_pause = 0;
 241
 242                 if (glpa & (LPA_1000FULL | LPA_1000HALF)) {
 243                         phy->speed = SPEED_1000;
 244                         if (glpa & LPA_1000FULL)
 245                                 phy->duplex = DUPLEX_FULL;
 246                 } else if (lpa & (LPA_100FULL | LPA_100HALF)) {
 247                         phy->speed = SPEED_100;
 248                         if (lpa & LPA_100FULL)
 249                                 phy->duplex = DUPLEX_FULL;
 250                 } else if (lpa & LPA_10FULL)
 251                         phy->duplex = DUPLEX_FULL;
 252
 253                 if (phy->duplex == DUPLEX_FULL) {
 254                         phy->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
 255                         phy->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
 256                 }
 257         } else {
 258                 int bmcr = phy_read(phy, MII_BMCR);
 259                 if (bmcr < 0)
 260                         return bmcr;
 261
 262                 if (bmcr & BMCR_FULLDPLX)
 263                         phy->duplex = DUPLEX_FULL;
 264                 else
 265                         phy->duplex = DUPLEX_HALF;
 266                 if (bmcr & BMCR_SPEED1000)
 267                         phy->speed = SPEED_1000;
 268                 else if (bmcr & BMCR_SPEED100)
 269                         phy->speed = SPEED_100;
 270                 else
 271                         phy->speed = SPEED_10;
 272
 273                 phy->pause = phy->asym_pause = 0;
 274         }
 275         return 0;
 276 }
 277
 278 /* Generic implementation for most 10/100/1000 PHYs */
 279 static struct mii_phy_ops generic_phy_ops = {
 280         .setup_aneg     = genmii_setup_aneg,
 281         .setup_forced   = genmii_setup_forced,
 282         .poll_link      = genmii_poll_link,
 283         .read_link      = genmii_read_link
 284 };
 285
 286 static struct mii_phy_def genmii_phy_def = {
 287         .phy_id         = 0x00000000,
 288         .phy_id_mask    = 0x00000000,
 289         .name           = "Generic MII",
 290         .ops            = &generic_phy_ops
 291 };
 292
 293 /* CIS8201 */
 294 #define MII_CIS8201_10BTCSR     0x16
 295 #define  TENBTCSR_ECHO_DISABLE  0x2000
 296 #define MII_CIS8201_EPCR        0x17
 297 #define  EPCR_MODE_MASK         0x3000
 298 #define  EPCR_GMII_MODE         0x0000
 299 #define  EPCR_RGMII_MODE        0x1000
 300 #define  EPCR_TBI_MODE          0x2000
 301 #define  EPCR_RTBI_MODE         0x3000
 302 #define MII_CIS8201_ACSR        0x1c
 303 #define  ACSR_PIN_PRIO_SELECT   0x0004
 304
 305 static int cis8201_init(struct mii_phy *phy)
 306 {
 307         int epcr;
 308
 309         epcr = phy_read(phy, MII_CIS8201_EPCR);
 310         if (epcr < 0)
 311                 return epcr;
 312
 313         epcr &= ~EPCR_MODE_MASK;
 314
 315         switch (phy->mode) {
 316         case PHY_MODE_TBI:
 317                 epcr |= EPCR_TBI_MODE;
 318                 break;
 319         case PHY_MODE_RTBI:
 320                 epcr |= EPCR_RTBI_MODE;
 321                 break;
 322         case PHY_MODE_GMII:
 323                 epcr |= EPCR_GMII_MODE;
 324                 break;
 325         case PHY_MODE_RGMII:
 326         default:
 327                 epcr |= EPCR_RGMII_MODE;
 328         }
 329
 330         phy_write(phy, MII_CIS8201_EPCR, epcr);
 331
 332         /* MII regs override strap pins */
 333         phy_write(phy, MII_CIS8201_ACSR,
 334                   phy_read(phy, MII_CIS8201_ACSR) | ACSR_PIN_PRIO_SELECT);
 335
 336         /* Disable TX_EN -> CRS echo mode, otherwise 10/HDX doesn't work */
 337         phy_write(phy, MII_CIS8201_10BTCSR,
 338                   phy_read(phy, MII_CIS8201_10BTCSR) | TENBTCSR_ECHO_DISABLE);
 339
 340         return 0;
 341 }
 342
 343 static struct mii_phy_ops cis8201_phy_ops = {
 344         .init           = cis8201_init,
 345         .setup_aneg     = genmii_setup_aneg,
 346         .setup_forced   = genmii_setup_forced,
 347         .poll_link      = genmii_poll_link,
 348         .read_link      = genmii_read_link
 349 };
 350
 351 static struct mii_phy_def cis8201_phy_def = {
 352         .phy_id         = 0x000fc410,
 353         .phy_id_mask    = 0x000ffff0,
 354         .name           = "CIS8201 Gigabit Ethernet",
 355         .ops            = &cis8201_phy_ops
 356 };
 357
 358 static struct mii_phy_def bcm5248_phy_def = {
 359
 360         .phy_id         = 0x0143bc00,
 361         .phy_id_mask    = 0x0ffffff0,
 362         .name           = "BCM5248 10/100 SMII Ethernet",
 363         .ops            = &generic_phy_ops
 364 };
 365
 366 static int m88e1111_init(struct mii_phy *phy)
 367 {
 368         pr_debug("%s: Marvell 88E1111 Ethernet\n", __func__);
 369         phy_write(phy, 0x14, 0x0ce3);
 370         phy_write(phy, 0x18, 0x4101);
 371         phy_write(phy, 0x09, 0x0e00);
 372         phy_write(phy, 0x04, 0x01e1);
 373         phy_write(phy, 0x00, 0x9140);
 374         phy_write(phy, 0x00, 0x1140);
 375
 376         return  0;
 377 }
 378
 379 static int m88e1112_init(struct mii_phy *phy)
 380 {
 381         /*
 382          * Marvell 88E1112 PHY needs to have the SGMII MAC
 383          * interace (page 2) properly configured to
 384          * communicate with the 460EX/GT GPCS interface.
 385          */
 386
 387         u16 reg_short;
 388
 389         pr_debug("%s: Marvell 88E1112 Ethernet\n", __func__);
 390
 391         /* Set access to Page 2 */
 392         phy_write(phy, 0x16, 0x0002);
 393
 394         phy_write(phy, 0x00, 0x0040); /* 1Gbps */
 395         reg_short = (u16)(phy_read(phy, 0x1a));
 396         reg_short |= 0x8000; /* bypass Auto-Negotiation */
 397         phy_write(phy, 0x1a, reg_short);
 398         emac_mii_reset_phy(phy); /* reset MAC interface */
 399
 400         /* Reset access to Page 0 */
 401         phy_write(phy, 0x16, 0x0000);
 402
 403         return  0;
 404 }
 405
 406 static int et1011c_init(struct mii_phy *phy)
 407 {
 408         u16 reg_short;
 409
 410         reg_short = (u16)(phy_read(phy, 0x16));
 411         reg_short &= ~(0x7);
 412         reg_short |= 0x6;       /* RGMII Trace Delay*/
 413         phy_write(phy, 0x16, reg_short);
 414
 415         reg_short = (u16)(phy_read(phy, 0x17));
 416         reg_short &= ~(0x40);
 417         phy_write(phy, 0x17, reg_short);
 418
 419         phy_write(phy, 0x1c, 0x74f0);
 420         return 0;
 421 }
 422
 423 static struct mii_phy_ops et1011c_phy_ops = {
 424         .init           = et1011c_init,
 425         .setup_aneg     = genmii_setup_aneg,
 426         .setup_forced   = genmii_setup_forced,
 427         .poll_link      = genmii_poll_link,
 428         .read_link      = genmii_read_link
 429 };
 430
 431 static struct mii_phy_def et1011c_phy_def = {
 432         .phy_id         = 0x0282f000,
 433         .phy_id_mask    = 0x0fffff00,
 434         .name           = "ET1011C Gigabit Ethernet",
 435         .ops            = &et1011c_phy_ops
 436 };
 437
 438
 439
 440
 441
 442 static struct mii_phy_ops m88e1111_phy_ops = {
 443         .init           = m88e1111_init,
 444         .setup_aneg     = genmii_setup_aneg,
 445         .setup_forced   = genmii_setup_forced,
 446         .poll_link      = genmii_poll_link,
 447         .read_link      = genmii_read_link
 448 };
 449
 450 static struct mii_phy_def m88e1111_phy_def = {
 451
 452         .phy_id         = 0x01410CC0,
 453         .phy_id_mask    = 0x0ffffff0,
 454         .name           = "Marvell 88E1111 Ethernet",
 455         .ops            = &m88e1111_phy_ops,
 456 };
 457
 458 static struct mii_phy_ops m88e1112_phy_ops = {
 459         .init           = m88e1112_init,
 460         .setup_aneg     = genmii_setup_aneg,
 461         .setup_forced   = genmii_setup_forced,
 462         .poll_link      = genmii_poll_link,
 463         .read_link      = genmii_read_link
 464 };
 465
 466 static struct mii_phy_def m88e1112_phy_def = {
 467         .phy_id         = 0x01410C90,
 468         .phy_id_mask    = 0x0ffffff0,
 469         .name           = "Marvell 88E1112 Ethernet",
 470         .ops            = &m88e1112_phy_ops,
 471 };
 472
 473 static struct mii_phy_def *mii_phy_table[] = {
 474         &et1011c_phy_def,
 475         &cis8201_phy_def,
 476         &bcm5248_phy_def,
 477         &m88e1111_phy_def,
 478         &m88e1112_phy_def,
 479         &genmii_phy_def,
 480         NULL
 481 };
 482
 483 int emac_mii_phy_probe(struct mii_phy *phy, int address)
 484 {
 485         struct mii_phy_def *def;
 486         int i;
 487         u32 id;
 488
 489         phy->autoneg = AUTONEG_DISABLE;
 490         phy->advertising = 0;
 491         phy->address = address;
 492         phy->speed = SPEED_10;
 493         phy->duplex = DUPLEX_HALF;
 494         phy->pause = phy->asym_pause = 0;
 495
 496         /* Take PHY out of isolate mode and reset it. */
 497         if (emac_mii_reset_phy(phy))
 498                 return -ENODEV;
 499
 500         /* Read ID and find matching entry */
 501         id = (phy_read(phy, MII_PHYSID1) << 16) | phy_read(phy, MII_PHYSID2);
 502         for (i = 0; (def = mii_phy_table[i]) != NULL; i++)
 503                 if ((id & def->phy_id_mask) == def->phy_id)
 504                         break;
 505         /* Should never be NULL (we have a generic entry), but... */
 506         if (!def)
 507                 return -ENODEV;
 508
 509         phy->def = def;
 510
 511         /* Determine PHY features if needed */
 512         phy->features = def->features;
 513         if (!phy->features) {
 514                 u16 bmsr = phy_read(phy, MII_BMSR);
 515                 if (bmsr & BMSR_ANEGCAPABLE)
 516                         phy->features |= SUPPORTED_Autoneg;
 517                 if (bmsr & BMSR_10HALF)
 518                         phy->features |= SUPPORTED_10baseT_Half;
 519                 if (bmsr & BMSR_10FULL)
 520                         phy->features |= SUPPORTED_10baseT_Full;
 521                 if (bmsr & BMSR_100HALF)
 522                         phy->features |= SUPPORTED_100baseT_Half;
 523                 if (bmsr & BMSR_100FULL)
 524                         phy->features |= SUPPORTED_100baseT_Full;
 525                 if (bmsr & BMSR_ESTATEN) {
 526                         u16 esr = phy_read(phy, MII_ESTATUS);
 527                         if (esr & ESTATUS_1000_TFULL)
 528                                 phy->features |= SUPPORTED_1000baseT_Full;
 529                         if (esr & ESTATUS_1000_THALF)
 530                                 phy->features |= SUPPORTED_1000baseT_Half;
 531                 }
 532                 phy->features |= SUPPORTED_MII;
 533         }
 534
 535         /* Setup default advertising */
 536         phy->advertising = phy->features;
 537
 538         return 0;
 539 }
 540
 541 MODULE_LICENSE("GPL");