kernel/drivers/net/ethernet/dec/tulip/media.c

   1 /*
   2         drivers/net/ethernet/dec/tulip/media.c
   3
   4         Copyright 2000,2001  The Linux Kernel Team
   5         Written/copyright 1994-2001 by Donald Becker.
   6
   7         This software may be used and distributed according to the terms
   8         of the GNU General Public License, incorporated herein by reference.
   9
  10         Please submit bugs to http://bugzilla.kernel.org/ .
  11 */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/mii.h>
  15 #include <linux/delay.h>
  16 #include <linux/pci.h>
  17 #include "tulip.h"
  18
  19
  20 /* The maximum data clock rate is 2.5 Mhz.  The minimum timing is usually
  21    met by back-to-back PCI I/O cycles, but we insert a delay to avoid
  22    "overclocking" issues or future 66Mhz PCI. */
  23 #define mdio_delay() ioread32(mdio_addr)
  24
  25 /* Read and write the MII registers using software-generated serial
  26    MDIO protocol.  It is just different enough from the EEPROM protocol
  27    to not share code.  The maxium data clock rate is 2.5 Mhz. */
  28 #define MDIO_SHIFT_CLK          0x10000
  29 #define MDIO_DATA_WRITE0        0x00000
  30 #define MDIO_DATA_WRITE1        0x20000
  31 #define MDIO_ENB                0x00000 /* Ignore the 0x02000 databook setting. */
  32 #define MDIO_ENB_IN             0x40000
  33 #define MDIO_DATA_READ          0x80000
  34
  35 static const unsigned char comet_miireg2offset[32] = {
  36         0xB4, 0xB8, 0xBC, 0xC0,  0xC4, 0xC8, 0xCC, 0,  0,0,0,0,  0,0,0,0,
  37         0,0xD0,0,0,  0,0,0,0,  0,0,0,0, 0, 0xD4, 0xD8, 0xDC, };
  38
  39
  40 /* MII transceiver control section.
  41    Read and write the MII registers using software-generated serial
  42    MDIO protocol.
  43    See IEEE 802.3-2002.pdf (Section 2, Chapter "22.2.4 Management functions")
  44    or DP83840A data sheet for more details.
  45    */
  46
  47 int tulip_mdio_read(struct net_device *dev, int phy_id, int location)
  48 {
  49         struct tulip_private *tp = netdev_priv(dev);
  50         int i;
  51         int read_cmd = (0xf6 << 10) | ((phy_id & 0x1f) << 5) | location;
  52         int retval = 0;
  53         void __iomem *ioaddr = tp->base_addr;
  54         void __iomem *mdio_addr = ioaddr + CSR9;
  55         unsigned long flags;
  56
  57         if (location & ~0x1f)
  58                 return 0xffff;
  59
  60         if (tp->chip_id == COMET  &&  phy_id == 30) {
  61                 if (comet_miireg2offset[location])
  62                         return ioread32(ioaddr + comet_miireg2offset[location]);
  63                 return 0xffff;
  64         }
  65
  66         spin_lock_irqsave(&tp->mii_lock, flags);
  67         if (tp->chip_id == LC82C168) {
  68                 iowrite32(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0);
  69                 ioread32(ioaddr + 0xA0);
  70                 ioread32(ioaddr + 0xA0);
  71                 for (i = 1000; i >= 0; --i) {
  72                         barrier();
  73                         if ( ! ((retval = ioread32(ioaddr + 0xA0)) & 0x80000000))
  74                                 break;
  75                 }
  76                 spin_unlock_irqrestore(&tp->mii_lock, flags);
  77                 return retval & 0xffff;
  78         }
  79
  80         /* Establish sync by sending at least 32 logic ones. */
  81         for (i = 32; i >= 0; i--) {
  82                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
  83                 mdio_delay();
  84                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
  85                 mdio_delay();
  86         }
  87         /* Shift the read command bits out. */
  88         for (i = 15; i >= 0; i--) {
  89                 int dataval = (read_cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
  90
  91                 iowrite32(MDIO_ENB | dataval, mdio_addr);
  92                 mdio_delay();
  93                 iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
  94                 mdio_delay();
  95         }
  96         /* Read the two transition, 16 data, and wire-idle bits. */
  97         for (i = 19; i > 0; i--) {
  98                 iowrite32(MDIO_ENB_IN, mdio_addr);
  99                 mdio_delay();
 100                 retval = (retval << 1) | ((ioread32(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
 101                 iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
 102                 mdio_delay();
 103         }
 104
 105         spin_unlock_irqrestore(&tp->mii_lock, flags);
 106         return (retval>>1) & 0xffff;
 107 }
 108
 109 void tulip_mdio_write(struct net_device *dev, int phy_id, int location, int val)
 110 {
 111         struct tulip_private *tp = netdev_priv(dev);
 112         int i;
 113         int cmd = (0x5002 << 16) | ((phy_id & 0x1f) << 23) | (location<<18) | (val & 0xffff);
 114         void __iomem *ioaddr = tp->base_addr;
 115         void __iomem *mdio_addr = ioaddr + CSR9;
 116         unsigned long flags;
 117
 118         if (location & ~0x1f)
 119                 return;
 120
 121         if (tp->chip_id == COMET && phy_id == 30) {
 122                 if (comet_miireg2offset[location])
 123                         iowrite32(val, ioaddr + comet_miireg2offset[location]);
 124                 return;
 125         }
 126
 127         spin_lock_irqsave(&tp->mii_lock, flags);
 128         if (tp->chip_id == LC82C168) {
 129                 iowrite32(cmd, ioaddr + 0xA0);
 130                 for (i = 1000; i >= 0; --i) {
 131                         barrier();
 132                         if ( ! (ioread32(ioaddr + 0xA0) & 0x80000000))
 133                                 break;
 134                 }
 135                 spin_unlock_irqrestore(&tp->mii_lock, flags);
 136                 return;
 137         }
 138
 139         /* Establish sync by sending 32 logic ones. */
 140         for (i = 32; i >= 0; i--) {
 141                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
 142                 mdio_delay();
 143                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
 144                 mdio_delay();
 145         }
 146         /* Shift the command bits out. */
 147         for (i = 31; i >= 0; i--) {
 148                 int dataval = (cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
 149                 iowrite32(MDIO_ENB | dataval, mdio_addr);
 150                 mdio_delay();
 151                 iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
 152                 mdio_delay();
 153         }
 154         /* Clear out extra bits. */
 155         for (i = 2; i > 0; i--) {
 156                 iowrite32(MDIO_ENB_IN, mdio_addr);
 157                 mdio_delay();
 158                 iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
 159                 mdio_delay();
 160         }
 161
 162         spin_unlock_irqrestore(&tp->mii_lock, flags);
 163 }
 164
 165
 166 /* Set up the transceiver control registers for the selected media type. */
 167 void tulip_select_media(struct net_device *dev, int startup)
 168 {
 169         struct tulip_private *tp = netdev_priv(dev);
 170         void __iomem *ioaddr = tp->base_addr;
 171         struct mediatable *mtable = tp->mtable;
 172         u32 new_csr6;
 173         int i;
 174
 175         if (mtable) {
 176                 struct medialeaf *mleaf = &mtable->mleaf[tp->cur_index];
 177                 unsigned char *p = mleaf->leafdata;
 178                 switch (mleaf->type) {
 179                 case 0:                                 /* 21140 non-MII xcvr. */
 180                         if (tulip_debug > 1)
 181                                 netdev_dbg(dev, "Using a 21140 non-MII transceiver with control setting %02x\n",
 182                                            p[1]);
 183                         dev->if_port = p[0];
 184                         if (startup)
 185                                 iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
 186                         iowrite32(p[1], ioaddr + CSR12);
 187                         new_csr6 = 0x02000000 | ((p[2] & 0x71) << 18);
 188                         break;
 189                 case 2: case 4: {
 190                         u16 setup[5];
 191                         u32 csr13val, csr14val, csr15dir, csr15val;
 192                         for (i = 0; i < 5; i++)
 193                                 setup[i] = get_u16(&p[i*2 + 1]);
 194
 195                         dev->if_port = p[0] & MEDIA_MASK;
 196                         if (tulip_media_cap[dev->if_port] & MediaAlwaysFD)
 197                                 tp->full_duplex = 1;
 198
 199                         if (startup && mtable->has_reset) {
 200                                 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
 201                                 unsigned char *rst = rleaf->leafdata;
 202                                 if (tulip_debug > 1)
 203                                         netdev_dbg(dev, "Resetting the transceiver\n");
 204                                 for (i = 0; i < rst[0]; i++)
 205                                         iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
 206                         }
 207                         if (tulip_debug > 1)
 208                                 netdev_dbg(dev, "21143 non-MII %s transceiver control %04x/%04x\n",
 209                                            medianame[dev->if_port],
 210                                            setup[0], setup[1]);
 211                         if (p[0] & 0x40) {      /* SIA (CSR13-15) setup values are provided. */
 212                                 csr13val = setup[0];
 213                                 csr14val = setup[1];
 214                                 csr15dir = (setup[3]<<16) | setup[2];
 215                                 csr15val = (setup[4]<<16) | setup[2];
 216                                 iowrite32(0, ioaddr + CSR13);
 217                                 iowrite32(csr14val, ioaddr + CSR14);
 218                                 iowrite32(csr15dir, ioaddr + CSR15);    /* Direction */
 219                                 iowrite32(csr15val, ioaddr + CSR15);    /* Data */
 220                                 iowrite32(csr13val, ioaddr + CSR13);
 221                         } else {
 222                                 csr13val = 1;
 223                                 csr14val = 0;
 224                                 csr15dir = (setup[0]<<16) | 0x0008;
 225                                 csr15val = (setup[1]<<16) | 0x0008;
 226                                 if (dev->if_port <= 4)
 227                                         csr14val = t21142_csr14[dev->if_port];
 228                                 if (startup) {
 229                                         iowrite32(0, ioaddr + CSR13);
 230                                         iowrite32(csr14val, ioaddr + CSR14);
 231                                 }
 232                                 iowrite32(csr15dir, ioaddr + CSR15);    /* Direction */
 233                                 iowrite32(csr15val, ioaddr + CSR15);    /* Data */
 234                                 if (startup) iowrite32(csr13val, ioaddr + CSR13);
 235                         }
 236                         if (tulip_debug > 1)
 237                                 netdev_dbg(dev, "Setting CSR15 to %08x/%08x\n",
 238                                            csr15dir, csr15val);
 239                         if (mleaf->type == 4)
 240                                 new_csr6 = 0x82020000 | ((setup[2] & 0x71) << 18);
 241                         else
 242                                 new_csr6 = 0x82420000;
 243                         break;
 244                 }
 245                 case 1: case 3: {
 246                         int phy_num = p[0];
 247                         int init_length = p[1];
 248                         u16 *misc_info, tmp_info;
 249
 250                         dev->if_port = 11;
 251                         new_csr6 = 0x020E0000;
 252                         if (mleaf->type == 3) { /* 21142 */
 253                                 u16 *init_sequence = (u16*)(p+2);
 254                                 u16 *reset_sequence = &((u16*)(p+3))[init_length];
 255                                 int reset_length = p[2 + init_length*2];
 256                                 misc_info = reset_sequence + reset_length;
 257                                 if (startup) {
 258                                         int timeout = 10;       /* max 1 ms */
 259                                         for (i = 0; i < reset_length; i++)
 260                                                 iowrite32(get_u16(&reset_sequence[i]) << 16, ioaddr + CSR15);
 261
 262                                         /* flush posted writes */
 263                                         ioread32(ioaddr + CSR15);
 264
 265                                         /* Sect 3.10.3 in DP83840A.pdf (p39) */
 266                                         udelay(500);
 267
 268                                         /* Section 4.2 in DP83840A.pdf (p43) */
 269                                         /* and IEEE 802.3 "22.2.4.1.1 Reset" */
 270                                         while (timeout-- &&
 271                                                 (tulip_mdio_read (dev, phy_num, MII_BMCR) & BMCR_RESET))
 272                                                 udelay(100);
 273                                 }
 274                                 for (i = 0; i < init_length; i++)
 275                                         iowrite32(get_u16(&init_sequence[i]) << 16, ioaddr + CSR15);
 276
 277                                 ioread32(ioaddr + CSR15);       /* flush posted writes */
 278                         } else {
 279                                 u8 *init_sequence = p + 2;
 280                                 u8 *reset_sequence = p + 3 + init_length;
 281                                 int reset_length = p[2 + init_length];
 282                                 misc_info = (u16*)(reset_sequence + reset_length);
 283                                 if (startup) {
 284                                         int timeout = 10;       /* max 1 ms */
 285                                         iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
 286                                         for (i = 0; i < reset_length; i++)
 287                                                 iowrite32(reset_sequence[i], ioaddr + CSR12);
 288
 289                                         /* flush posted writes */
 290                                         ioread32(ioaddr + CSR12);
 291
 292                                         /* Sect 3.10.3 in DP83840A.pdf (p39) */
 293                                         udelay(500);
 294
 295                                         /* Section 4.2 in DP83840A.pdf (p43) */
 296                                         /* and IEEE 802.3 "22.2.4.1.1 Reset" */
 297                                         while (timeout-- &&
 298                                                 (tulip_mdio_read (dev, phy_num, MII_BMCR) & BMCR_RESET))
 299                                                 udelay(100);
 300                                 }
 301                                 for (i = 0; i < init_length; i++)
 302                                         iowrite32(init_sequence[i], ioaddr + CSR12);
 303
 304                                 ioread32(ioaddr + CSR12);       /* flush posted writes */
 305                         }
 306
 307                         tmp_info = get_u16(&misc_info[1]);
 308                         if (tmp_info)
 309                                 tp->advertising[phy_num] = tmp_info | 1;
 310                         if (tmp_info && startup < 2) {
 311                                 if (tp->mii_advertise == 0)
 312                                         tp->mii_advertise = tp->advertising[phy_num];
 313                                 if (tulip_debug > 1)
 314                                         netdev_dbg(dev, " Advertising %04x on MII %d\n",
 315                                                    tp->mii_advertise,
 316                                                    tp->phys[phy_num]);
 317                                 tulip_mdio_write(dev, tp->phys[phy_num], 4, tp->mii_advertise);
 318                         }
 319                         break;
 320                 }
 321                 case 5: case 6: {
 322                         u16 setup[5];
 323
 324                         new_csr6 = 0; /* FIXME */
 325
 326                         for (i = 0; i < 5; i++)
 327                                 setup[i] = get_u16(&p[i*2 + 1]);
 328
 329                         if (startup && mtable->has_reset) {
 330                                 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
 331                                 unsigned char *rst = rleaf->leafdata;
 332                                 if (tulip_debug > 1)
 333                                         netdev_dbg(dev, "Resetting the transceiver\n");
 334                                 for (i = 0; i < rst[0]; i++)
 335                                         iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
 336                         }
 337
 338                         break;
 339                 }
 340                 default:
 341                         netdev_dbg(dev, " Invalid media table selection %d\n",
 342                                    mleaf->type);
 343                         new_csr6 = 0x020E0000;
 344                 }
 345                 if (tulip_debug > 1)
 346                         netdev_dbg(dev, "Using media type %s, CSR12 is %02x\n",
 347                                    medianame[dev->if_port],
 348                                    ioread32(ioaddr + CSR12) & 0xff);
 349         } else if (tp->chip_id == LC82C168) {
 350                 if (startup && ! tp->medialock)
 351                         dev->if_port = tp->mii_cnt ? 11 : 0;
 352                 if (tulip_debug > 1)
 353                         netdev_dbg(dev, "PNIC PHY status is %3.3x, media %s\n",
 354                                    ioread32(ioaddr + 0xB8),
 355                                    medianame[dev->if_port]);
 356                 if (tp->mii_cnt) {
 357                         new_csr6 = 0x810C0000;
 358                         iowrite32(0x0001, ioaddr + CSR15);
 359                         iowrite32(0x0201B07A, ioaddr + 0xB8);
 360                 } else if (startup) {
 361                         /* Start with 10mbps to do autonegotiation. */
 362                         iowrite32(0x32, ioaddr + CSR12);
 363                         new_csr6 = 0x00420000;
 364                         iowrite32(0x0001B078, ioaddr + 0xB8);
 365                         iowrite32(0x0201B078, ioaddr + 0xB8);
 366                 } else if (dev->if_port == 3  ||  dev->if_port == 5) {
 367                         iowrite32(0x33, ioaddr + CSR12);
 368                         new_csr6 = 0x01860000;
 369                         /* Trigger autonegotiation. */
 370                         iowrite32(startup ? 0x0201F868 : 0x0001F868, ioaddr + 0xB8);
 371                 } else {
 372                         iowrite32(0x32, ioaddr + CSR12);
 373                         new_csr6 = 0x00420000;
 374                         iowrite32(0x1F078, ioaddr + 0xB8);
 375                 }
 376         } else {                                        /* Unknown chip type with no media table. */
 377                 if (tp->default_port == 0)
 378                         dev->if_port = tp->mii_cnt ? 11 : 3;
 379                 if (tulip_media_cap[dev->if_port] & MediaIsMII) {
 380                         new_csr6 = 0x020E0000;
 381                 } else if (tulip_media_cap[dev->if_port] & MediaIsFx) {
 382                         new_csr6 = 0x02860000;
 383                 } else
 384                         new_csr6 = 0x03860000;
 385                 if (tulip_debug > 1)
 386                         netdev_dbg(dev, "No media description table, assuming %s transceiver, CSR12 %02x\n",
 387                                    medianame[dev->if_port],
 388                                    ioread32(ioaddr + CSR12));
 389         }
 390
 391         tp->csr6 = new_csr6 | (tp->csr6 & 0xfdff) | (tp->full_duplex ? 0x0200 : 0);
 392
 393         mdelay(1);
 394 }
 395
 396 /*
 397   Check the MII negotiated duplex and change the CSR6 setting if
 398   required.
 399   Return 0 if everything is OK.
 400   Return < 0 if the transceiver is missing or has no link beat.
 401   */
 402 int tulip_check_duplex(struct net_device *dev)
 403 {
 404         struct tulip_private *tp = netdev_priv(dev);
 405         unsigned int bmsr, lpa, negotiated, new_csr6;
 406
 407         bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
 408         lpa = tulip_mdio_read(dev, tp->phys[0], MII_LPA);
 409         if (tulip_debug > 1)
 410                 dev_info(&dev->dev, "MII status %04x, Link partner report %04x\n",
 411                          bmsr, lpa);
 412         if (bmsr == 0xffff)
 413                 return -2;
 414         if ((bmsr & BMSR_LSTATUS) == 0) {
 415                 int new_bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
 416                 if ((new_bmsr & BMSR_LSTATUS) == 0) {
 417                         if (tulip_debug  > 1)
 418                                 dev_info(&dev->dev,
 419                                          "No link beat on the MII interface, status %04x\n",
 420                                          new_bmsr);
 421                         return -1;
 422                 }
 423         }
 424         negotiated = lpa & tp->advertising[0];
 425         tp->full_duplex = mii_duplex(tp->full_duplex_lock, negotiated);
 426
 427         new_csr6 = tp->csr6;
 428
 429         if (negotiated & LPA_100) new_csr6 &= ~TxThreshold;
 430         else                      new_csr6 |= TxThreshold;
 431         if (tp->full_duplex) new_csr6 |= FullDuplex;
 432         else                 new_csr6 &= ~FullDuplex;
 433
 434         if (new_csr6 != tp->csr6) {
 435                 tp->csr6 = new_csr6;
 436                 tulip_restart_rxtx(tp);
 437
 438                 if (tulip_debug > 0)
 439                         dev_info(&dev->dev,
 440                                  "Setting %s-duplex based on MII#%d link partner capability of %04x\n",
 441                                  tp->full_duplex ? "full" : "half",
 442                                  tp->phys[0], lpa);
 443                 return 1;
 444         }
 445
 446         return 0;
 447 }
 448
 449 void tulip_find_mii(struct net_device *dev, int board_idx)
 450 {
 451         struct tulip_private *tp = netdev_priv(dev);
 452         int phyn, phy_idx = 0;
 453         int mii_reg0;
 454         int mii_advert;
 455         unsigned int to_advert, new_bmcr, ane_switch;
 456
 457         /* Find the connected MII xcvrs.
 458            Doing this in open() would allow detecting external xcvrs later,
 459            but takes much time. */
 460         for (phyn = 1; phyn <= 32 && phy_idx < ARRAY_SIZE(tp->phys); phyn++) {
 461                 int phy = phyn & 0x1f;
 462                 int mii_status = tulip_mdio_read (dev, phy, MII_BMSR);
 463                 if ((mii_status & 0x8301) == 0x8001 ||
 464                     ((mii_status & BMSR_100BASE4) == 0 &&
 465                      (mii_status & 0x7800) != 0)) {
 466                         /* preserve Becker logic, gain indentation level */
 467                 } else {
 468                         continue;
 469                 }
 470
 471                 mii_reg0 = tulip_mdio_read (dev, phy, MII_BMCR);
 472                 mii_advert = tulip_mdio_read (dev, phy, MII_ADVERTISE);
 473                 ane_switch = 0;
 474
 475                 /* if not advertising at all, gen an
 476                  * advertising value from the capability
 477                  * bits in BMSR
 478                  */
 479                 if ((mii_advert & ADVERTISE_ALL) == 0) {
 480                         unsigned int tmpadv = tulip_mdio_read (dev, phy, MII_BMSR);
 481                         mii_advert = ((tmpadv >> 6) & 0x3e0) | 1;
 482                 }
 483
 484                 if (tp->mii_advertise) {
 485                         tp->advertising[phy_idx] =
 486                         to_advert = tp->mii_advertise;
 487                 } else if (tp->advertising[phy_idx]) {
 488                         to_advert = tp->advertising[phy_idx];
 489                 } else {
 490                         tp->advertising[phy_idx] =
 491                         tp->mii_advertise =
 492                         to_advert = mii_advert;
 493                 }
 494
 495                 tp->phys[phy_idx++] = phy;
 496
 497                 pr_info("tulip%d:  MII transceiver #%d config %04x status %04x advertising %04x\n",
 498                         board_idx, phy, mii_reg0, mii_status, mii_advert);
 499
 500                 /* Fixup for DLink with miswired PHY. */
 501                 if (mii_advert != to_advert) {
 502                         pr_debug("tulip%d:  Advertising %04x on PHY %d, previously advertising %04x\n",
 503                                  board_idx, to_advert, phy, mii_advert);
 504                         tulip_mdio_write (dev, phy, 4, to_advert);
 505                 }
 506
 507                 /* Enable autonegotiation: some boards default to off. */
 508                 if (tp->default_port == 0) {
 509                         new_bmcr = mii_reg0 | BMCR_ANENABLE;
 510                         if (new_bmcr != mii_reg0) {
 511                                 new_bmcr |= BMCR_ANRESTART;
 512                                 ane_switch = 1;
 513                         }
 514                 }
 515                 /* ...or disable nway, if forcing media */
 516                 else {
 517                         new_bmcr = mii_reg0 & ~BMCR_ANENABLE;
 518                         if (new_bmcr != mii_reg0)
 519                                 ane_switch = 1;
 520                 }
 521
 522                 /* clear out bits we never want at this point */
 523                 new_bmcr &= ~(BMCR_CTST | BMCR_FULLDPLX | BMCR_ISOLATE |
 524                               BMCR_PDOWN | BMCR_SPEED100 | BMCR_LOOPBACK |
 525                               BMCR_RESET);
 526
 527                 if (tp->full_duplex)
 528                         new_bmcr |= BMCR_FULLDPLX;
 529                 if (tulip_media_cap[tp->default_port] & MediaIs100)
 530                         new_bmcr |= BMCR_SPEED100;
 531
 532                 if (new_bmcr != mii_reg0) {
 533                         /* some phys need the ANE switch to
 534                          * happen before forced media settings
 535                          * will "take."  However, we write the
 536                          * same value twice in order not to
 537                          * confuse the sane phys.
 538                          */
 539                         if (ane_switch) {
 540                                 tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
 541                                 udelay (10);
 542                         }
 543                         tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
 544                 }
 545         }
 546         tp->mii_cnt = phy_idx;
 547         if (tp->mtable && tp->mtable->has_mii && phy_idx == 0) {
 548                 pr_info("tulip%d: ***WARNING***: No MII transceiver found!\n",
 549                         board_idx);
 550                 tp->phys[0] = 1;
 551         }
 552 }