git.oblomov.eu Git - linux-2.6/blob - drivers/net/tulip/media.c

   1 /*
   2         drivers/net/tulip/media.c
   3
   4         Maintained by Valerie Henson <val_henson@linux.intel.com>
   5         Copyright 2000,2001  The Linux Kernel Team
   6         Written/copyright 1994-2001 by Donald Becker.
   7
   8         This software may be used and distributed according to the terms
   9         of the GNU General Public License, incorporated herein by reference.
  10
  11         Please refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
  12         for more information on this driver, or visit the project
  13         Web page at http://sourceforge.net/projects/tulip/
  14
  15 */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/mii.h>
  19 #include <linux/init.h>
  20 #include <linux/delay.h>
  21 #include <linux/pci.h>
  22 #include "tulip.h"
  23
  24
  25 /* The maximum data clock rate is 2.5 Mhz.  The minimum timing is usually
  26    met by back-to-back PCI I/O cycles, but we insert a delay to avoid
  27    "overclocking" issues or future 66Mhz PCI. */
  28 #define mdio_delay() ioread32(mdio_addr)
  29
  30 /* Read and write the MII registers using software-generated serial
  31    MDIO protocol.  It is just different enough from the EEPROM protocol
  32    to not share code.  The maxium data clock rate is 2.5 Mhz. */
  33 #define MDIO_SHIFT_CLK          0x10000
  34 #define MDIO_DATA_WRITE0        0x00000
  35 #define MDIO_DATA_WRITE1        0x20000
  36 #define MDIO_ENB                0x00000 /* Ignore the 0x02000 databook setting. */
  37 #define MDIO_ENB_IN             0x40000
  38 #define MDIO_DATA_READ          0x80000
  39
  40 static const unsigned char comet_miireg2offset[32] = {
  41         0xB4, 0xB8, 0xBC, 0xC0,  0xC4, 0xC8, 0xCC, 0,  0,0,0,0,  0,0,0,0,
  42         0,0xD0,0,0,  0,0,0,0,  0,0,0,0, 0, 0xD4, 0xD8, 0xDC, };
  43
  44
  45 /* MII transceiver control section.
  46    Read and write the MII registers using software-generated serial
  47    MDIO protocol.  See the MII specifications or DP83840A data sheet
  48    for details. */
  49
  50 int tulip_mdio_read(struct net_device *dev, int phy_id, int location)
  51 {
  52         struct tulip_private *tp = netdev_priv(dev);
  53         int i;
  54         int read_cmd = (0xf6 << 10) | ((phy_id & 0x1f) << 5) | location;
  55         int retval = 0;
  56         void __iomem *ioaddr = tp->base_addr;
  57         void __iomem *mdio_addr = ioaddr + CSR9;
  58         unsigned long flags;
  59
  60         if (location & ~0x1f)
  61                 return 0xffff;
  62
  63         if (tp->chip_id == COMET  &&  phy_id == 30) {
  64                 if (comet_miireg2offset[location])
  65                         return ioread32(ioaddr + comet_miireg2offset[location]);
  66                 return 0xffff;
  67         }
  68
  69         spin_lock_irqsave(&tp->mii_lock, flags);
  70         if (tp->chip_id == LC82C168) {
  71                 int i = 1000;
  72                 iowrite32(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0);
  73                 ioread32(ioaddr + 0xA0);
  74                 ioread32(ioaddr + 0xA0);
  75                 while (--i > 0) {
  76                         barrier();
  77                         if ( ! ((retval = ioread32(ioaddr + 0xA0)) & 0x80000000))
  78                                 break;
  79                 }
  80                 spin_unlock_irqrestore(&tp->mii_lock, flags);
  81                 return retval & 0xffff;
  82         }
  83
  84         /* Establish sync by sending at least 32 logic ones. */
  85         for (i = 32; i >= 0; i--) {
  86                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
  87                 mdio_delay();
  88                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
  89                 mdio_delay();
  90         }
  91         /* Shift the read command bits out. */
  92         for (i = 15; i >= 0; i--) {
  93                 int dataval = (read_cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
  94
  95                 iowrite32(MDIO_ENB | dataval, mdio_addr);
  96                 mdio_delay();
  97                 iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
  98                 mdio_delay();
  99         }
 100         /* Read the two transition, 16 data, and wire-idle bits. */
 101         for (i = 19; i > 0; i--) {
 102                 iowrite32(MDIO_ENB_IN, mdio_addr);
 103                 mdio_delay();
 104                 retval = (retval << 1) | ((ioread32(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
 105                 iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
 106                 mdio_delay();
 107         }
 108
 109         spin_unlock_irqrestore(&tp->mii_lock, flags);
 110         return (retval>>1) & 0xffff;
 111 }
 112
 113 void tulip_mdio_write(struct net_device *dev, int phy_id, int location, int val)
 114 {
 115         struct tulip_private *tp = netdev_priv(dev);
 116         int i;
 117         int cmd = (0x5002 << 16) | ((phy_id & 0x1f) << 23) | (location<<18) | (val & 0xffff);
 118         void __iomem *ioaddr = tp->base_addr;
 119         void __iomem *mdio_addr = ioaddr + CSR9;
 120         unsigned long flags;
 121
 122         if (location & ~0x1f)
 123                 return;
 124
 125         if (tp->chip_id == COMET && phy_id == 30) {
 126                 if (comet_miireg2offset[location])
 127                         iowrite32(val, ioaddr + comet_miireg2offset[location]);
 128                 return;
 129         }
 130
 131         spin_lock_irqsave(&tp->mii_lock, flags);
 132         if (tp->chip_id == LC82C168) {
 133                 int i = 1000;
 134                 iowrite32(cmd, ioaddr + 0xA0);
 135                 do {
 136                         barrier();
 137                         if ( ! (ioread32(ioaddr + 0xA0) & 0x80000000))
 138                                 break;
 139                 } while (--i > 0);
 140                 spin_unlock_irqrestore(&tp->mii_lock, flags);
 141                 return;
 142         }
 143
 144         /* Establish sync by sending 32 logic ones. */
 145         for (i = 32; i >= 0; i--) {
 146                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
 147                 mdio_delay();
 148                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
 149                 mdio_delay();
 150         }
 151         /* Shift the command bits out. */
 152         for (i = 31; i >= 0; i--) {
 153                 int dataval = (cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
 154                 iowrite32(MDIO_ENB | dataval, mdio_addr);
 155                 mdio_delay();
 156                 iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
 157                 mdio_delay();
 158         }
 159         /* Clear out extra bits. */
 160         for (i = 2; i > 0; i--) {
 161                 iowrite32(MDIO_ENB_IN, mdio_addr);
 162                 mdio_delay();
 163                 iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
 164                 mdio_delay();
 165         }
 166
 167         spin_unlock_irqrestore(&tp->mii_lock, flags);
 168 }
 169
 170
 171 /* Set up the transceiver control registers for the selected media type. */
 172 void tulip_select_media(struct net_device *dev, int startup)
 173 {
 174         struct tulip_private *tp = netdev_priv(dev);
 175         void __iomem *ioaddr = tp->base_addr;
 176         struct mediatable *mtable = tp->mtable;
 177         u32 new_csr6;
 178         int i;
 179
 180         if (mtable) {
 181                 struct medialeaf *mleaf = &mtable->mleaf[tp->cur_index];
 182                 unsigned char *p = mleaf->leafdata;
 183                 switch (mleaf->type) {
 184                 case 0:                                 /* 21140 non-MII xcvr. */
 185                         if (tulip_debug > 1)
 186                                 printk(KERN_DEBUG "%s: Using a 21140 non-MII transceiver"
 187                                            " with control setting %2.2x.\n",
 188                                            dev->name, p[1]);
 189                         dev->if_port = p[0];
 190                         if (startup)
 191                                 iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
 192                         iowrite32(p[1], ioaddr + CSR12);
 193                         new_csr6 = 0x02000000 | ((p[2] & 0x71) << 18);
 194                         break;
 195                 case 2: case 4: {
 196                         u16 setup[5];
 197                         u32 csr13val, csr14val, csr15dir, csr15val;
 198                         for (i = 0; i < 5; i++)
 199                                 setup[i] = get_u16(&p[i*2 + 1]);
 200
 201                         dev->if_port = p[0] & MEDIA_MASK;
 202                         if (tulip_media_cap[dev->if_port] & MediaAlwaysFD)
 203                                 tp->full_duplex = 1;
 204
 205                         if (startup && mtable->has_reset) {
 206                                 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
 207                                 unsigned char *rst = rleaf->leafdata;
 208                                 if (tulip_debug > 1)
 209                                         printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
 210                                                    dev->name);
 211                                 for (i = 0; i < rst[0]; i++)
 212                                         iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
 213                         }
 214                         if (tulip_debug > 1)
 215                                 printk(KERN_DEBUG "%s: 21143 non-MII %s transceiver control "
 216                                            "%4.4x/%4.4x.\n",
 217                                            dev->name, medianame[dev->if_port], setup[0], setup[1]);
 218                         if (p[0] & 0x40) {      /* SIA (CSR13-15) setup values are provided. */
 219                                 csr13val = setup[0];
 220                                 csr14val = setup[1];
 221                                 csr15dir = (setup[3]<<16) | setup[2];
 222                                 csr15val = (setup[4]<<16) | setup[2];
 223                                 iowrite32(0, ioaddr + CSR13);
 224                                 iowrite32(csr14val, ioaddr + CSR14);
 225                                 iowrite32(csr15dir, ioaddr + CSR15);    /* Direction */
 226                                 iowrite32(csr15val, ioaddr + CSR15);    /* Data */
 227                                 iowrite32(csr13val, ioaddr + CSR13);
 228                         } else {
 229                                 csr13val = 1;
 230                                 csr14val = 0;
 231                                 csr15dir = (setup[0]<<16) | 0x0008;
 232                                 csr15val = (setup[1]<<16) | 0x0008;
 233                                 if (dev->if_port <= 4)
 234                                         csr14val = t21142_csr14[dev->if_port];
 235                                 if (startup) {
 236                                         iowrite32(0, ioaddr + CSR13);
 237                                         iowrite32(csr14val, ioaddr + CSR14);
 238                                 }
 239                                 iowrite32(csr15dir, ioaddr + CSR15);    /* Direction */
 240                                 iowrite32(csr15val, ioaddr + CSR15);    /* Data */
 241                                 if (startup) iowrite32(csr13val, ioaddr + CSR13);
 242                         }
 243                         if (tulip_debug > 1)
 244                                 printk(KERN_DEBUG "%s:  Setting CSR15 to %8.8x/%8.8x.\n",
 245                                            dev->name, csr15dir, csr15val);
 246                         if (mleaf->type == 4)
 247                                 new_csr6 = 0x82020000 | ((setup[2] & 0x71) << 18);
 248                         else
 249                                 new_csr6 = 0x82420000;
 250                         break;
 251                 }
 252                 case 1: case 3: {
 253                         int phy_num = p[0];
 254                         int init_length = p[1];
 255                         u16 *misc_info, tmp_info;
 256
 257                         dev->if_port = 11;
 258                         new_csr6 = 0x020E0000;
 259                         if (mleaf->type == 3) { /* 21142 */
 260                                 u16 *init_sequence = (u16*)(p+2);
 261                                 u16 *reset_sequence = &((u16*)(p+3))[init_length];
 262                                 int reset_length = p[2 + init_length*2];
 263                                 misc_info = reset_sequence + reset_length;
 264                                 if (startup)
 265                                         for (i = 0; i < reset_length; i++)
 266                                                 iowrite32(get_u16(&reset_sequence[i]) << 16, ioaddr + CSR15);
 267                                 for (i = 0; i < init_length; i++)
 268                                         iowrite32(get_u16(&init_sequence[i]) << 16, ioaddr + CSR15);
 269                         } else {
 270                                 u8 *init_sequence = p + 2;
 271                                 u8 *reset_sequence = p + 3 + init_length;
 272                                 int reset_length = p[2 + init_length];
 273                                 misc_info = (u16*)(reset_sequence + reset_length);
 274                                 if (startup) {
 275                                         iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
 276                                         for (i = 0; i < reset_length; i++)
 277                                                 iowrite32(reset_sequence[i], ioaddr + CSR12);
 278                                 }
 279                                 for (i = 0; i < init_length; i++)
 280                                         iowrite32(init_sequence[i], ioaddr + CSR12);
 281                         }
 282                         tmp_info = get_u16(&misc_info[1]);
 283                         if (tmp_info)
 284                                 tp->advertising[phy_num] = tmp_info | 1;
 285                         if (tmp_info && startup < 2) {
 286                                 if (tp->mii_advertise == 0)
 287                                         tp->mii_advertise = tp->advertising[phy_num];
 288                                 if (tulip_debug > 1)
 289                                         printk(KERN_DEBUG "%s:  Advertising %4.4x on MII %d.\n",
 290                                                dev->name, tp->mii_advertise, tp->phys[phy_num]);
 291                                 tulip_mdio_write(dev, tp->phys[phy_num], 4, tp->mii_advertise);
 292                         }
 293                         break;
 294                 }
 295                 case 5: case 6: {
 296                         u16 setup[5];
 297
 298                         new_csr6 = 0; /* FIXME */
 299
 300                         for (i = 0; i < 5; i++)
 301                                 setup[i] = get_u16(&p[i*2 + 1]);
 302
 303                         if (startup && mtable->has_reset) {
 304                                 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
 305                                 unsigned char *rst = rleaf->leafdata;
 306                                 if (tulip_debug > 1)
 307                                         printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
 308                                                    dev->name);
 309                                 for (i = 0; i < rst[0]; i++)
 310                                         iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
 311                         }
 312
 313                         break;
 314                 }
 315                 default:
 316                         printk(KERN_DEBUG "%s:  Invalid media table selection %d.\n",
 317                                            dev->name, mleaf->type);
 318                         new_csr6 = 0x020E0000;
 319                 }
 320                 if (tulip_debug > 1)
 321                         printk(KERN_DEBUG "%s: Using media type %s, CSR12 is %2.2x.\n",
 322                                    dev->name, medianame[dev->if_port],
 323                                    ioread32(ioaddr + CSR12) & 0xff);
 324         } else if (tp->chip_id == LC82C168) {
 325                 if (startup && ! tp->medialock)
 326                         dev->if_port = tp->mii_cnt ? 11 : 0;
 327                 if (tulip_debug > 1)
 328                         printk(KERN_DEBUG "%s: PNIC PHY status is %3.3x, media %s.\n",
 329                                    dev->name, ioread32(ioaddr + 0xB8), medianame[dev->if_port]);
 330                 if (tp->mii_cnt) {
 331                         new_csr6 = 0x810C0000;
 332                         iowrite32(0x0001, ioaddr + CSR15);
 333                         iowrite32(0x0201B07A, ioaddr + 0xB8);
 334                 } else if (startup) {
 335                         /* Start with 10mbps to do autonegotiation. */
 336                         iowrite32(0x32, ioaddr + CSR12);
 337                         new_csr6 = 0x00420000;
 338                         iowrite32(0x0001B078, ioaddr + 0xB8);
 339                         iowrite32(0x0201B078, ioaddr + 0xB8);
 340                 } else if (dev->if_port == 3  ||  dev->if_port == 5) {
 341                         iowrite32(0x33, ioaddr + CSR12);
 342                         new_csr6 = 0x01860000;
 343                         /* Trigger autonegotiation. */
 344                         iowrite32(startup ? 0x0201F868 : 0x0001F868, ioaddr + 0xB8);
 345                 } else {
 346                         iowrite32(0x32, ioaddr + CSR12);
 347                         new_csr6 = 0x00420000;
 348                         iowrite32(0x1F078, ioaddr + 0xB8);
 349                 }
 350         } else {                                        /* Unknown chip type with no media table. */
 351                 if (tp->default_port == 0)
 352                         dev->if_port = tp->mii_cnt ? 11 : 3;
 353                 if (tulip_media_cap[dev->if_port] & MediaIsMII) {
 354                         new_csr6 = 0x020E0000;
 355                 } else if (tulip_media_cap[dev->if_port] & MediaIsFx) {
 356                         new_csr6 = 0x02860000;
 357                 } else
 358                         new_csr6 = 0x03860000;
 359                 if (tulip_debug > 1)
 360                         printk(KERN_DEBUG "%s: No media description table, assuming "
 361                                    "%s transceiver, CSR12 %2.2x.\n",
 362                                    dev->name, medianame[dev->if_port],
 363                                    ioread32(ioaddr + CSR12));
 364         }
 365
 366         tp->csr6 = new_csr6 | (tp->csr6 & 0xfdff) | (tp->full_duplex ? 0x0200 : 0);
 367
 368         mdelay(1);
 369
 370         return;
 371 }
 372
 373 /*
 374   Check the MII negotiated duplex and change the CSR6 setting if
 375   required.
 376   Return 0 if everything is OK.
 377   Return < 0 if the transceiver is missing or has no link beat.
 378   */
 379 int tulip_check_duplex(struct net_device *dev)
 380 {
 381         struct tulip_private *tp = netdev_priv(dev);
 382         unsigned int bmsr, lpa, negotiated, new_csr6;
 383
 384         bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
 385         lpa = tulip_mdio_read(dev, tp->phys[0], MII_LPA);
 386         if (tulip_debug > 1)
 387                 printk(KERN_INFO "%s: MII status %4.4x, Link partner report "
 388                            "%4.4x.\n", dev->name, bmsr, lpa);
 389         if (bmsr == 0xffff)
 390                 return -2;
 391         if ((bmsr & BMSR_LSTATUS) == 0) {
 392                 int new_bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
 393                 if ((new_bmsr & BMSR_LSTATUS) == 0) {
 394                         if (tulip_debug  > 1)
 395                                 printk(KERN_INFO "%s: No link beat on the MII interface,"
 396                                            " status %4.4x.\n", dev->name, new_bmsr);
 397                         return -1;
 398                 }
 399         }
 400         negotiated = lpa & tp->advertising[0];
 401         tp->full_duplex = mii_duplex(tp->full_duplex_lock, negotiated);
 402
 403         new_csr6 = tp->csr6;
 404
 405         if (negotiated & LPA_100) new_csr6 &= ~TxThreshold;
 406         else                      new_csr6 |= TxThreshold;
 407         if (tp->full_duplex) new_csr6 |= FullDuplex;
 408         else                 new_csr6 &= ~FullDuplex;
 409
 410         if (new_csr6 != tp->csr6) {
 411                 tp->csr6 = new_csr6;
 412                 tulip_restart_rxtx(tp);
 413
 414                 if (tulip_debug > 0)
 415                         printk(KERN_INFO "%s: Setting %s-duplex based on MII"
 416                                    "#%d link partner capability of %4.4x.\n",
 417                                    dev->name, tp->full_duplex ? "full" : "half",
 418                                    tp->phys[0], lpa);
 419                 return 1;
 420         }
 421
 422         return 0;
 423 }
 424
 425 void __devinit tulip_find_mii (struct net_device *dev, int board_idx)
 426 {
 427         struct tulip_private *tp = netdev_priv(dev);
 428         int phyn, phy_idx = 0;
 429         int mii_reg0;
 430         int mii_advert;
 431         unsigned int to_advert, new_bmcr, ane_switch;
 432
 433         /* Find the connected MII xcvrs.
 434            Doing this in open() would allow detecting external xcvrs later,
 435            but takes much time. */
 436         for (phyn = 1; phyn <= 32 && phy_idx < sizeof (tp->phys); phyn++) {
 437                 int phy = phyn & 0x1f;
 438                 int mii_status = tulip_mdio_read (dev, phy, MII_BMSR);
 439                 if ((mii_status & 0x8301) == 0x8001 ||
 440                     ((mii_status & BMSR_100BASE4) == 0
 441                      && (mii_status & 0x7800) != 0)) {
 442                         /* preserve Becker logic, gain indentation level */
 443                 } else {
 444                         continue;
 445                 }
 446
 447                 mii_reg0 = tulip_mdio_read (dev, phy, MII_BMCR);
 448                 mii_advert = tulip_mdio_read (dev, phy, MII_ADVERTISE);
 449                 ane_switch = 0;
 450
 451                 /* if not advertising at all, gen an
 452                  * advertising value from the capability
 453                  * bits in BMSR
 454                  */
 455                 if ((mii_advert & ADVERTISE_ALL) == 0) {
 456                         unsigned int tmpadv = tulip_mdio_read (dev, phy, MII_BMSR);
 457                         mii_advert = ((tmpadv >> 6) & 0x3e0) | 1;
 458                 }
 459
 460                 if (tp->mii_advertise) {
 461                         tp->advertising[phy_idx] =
 462                         to_advert = tp->mii_advertise;
 463                 } else if (tp->advertising[phy_idx]) {
 464                         to_advert = tp->advertising[phy_idx];
 465                 } else {
 466                         tp->advertising[phy_idx] =
 467                         tp->mii_advertise =
 468                         to_advert = mii_advert;
 469                 }
 470
 471                 tp->phys[phy_idx++] = phy;
 472
 473                 printk (KERN_INFO "tulip%d:  MII transceiver #%d "
 474                         "config %4.4x status %4.4x advertising %4.4x.\n",
 475                         board_idx, phy, mii_reg0, mii_status, mii_advert);
 476
 477                 /* Fixup for DLink with miswired PHY. */
 478                 if (mii_advert != to_advert) {
 479                         printk (KERN_DEBUG "tulip%d:  Advertising %4.4x on PHY %d,"
 480                                 " previously advertising %4.4x.\n",
 481                                 board_idx, to_advert, phy, mii_advert);
 482                         tulip_mdio_write (dev, phy, 4, to_advert);
 483                 }
 484
 485                 /* Enable autonegotiation: some boards default to off. */
 486                 if (tp->default_port == 0) {
 487                         new_bmcr = mii_reg0 | BMCR_ANENABLE;
 488                         if (new_bmcr != mii_reg0) {
 489                                 new_bmcr |= BMCR_ANRESTART;
 490                                 ane_switch = 1;
 491                         }
 492                 }
 493                 /* ...or disable nway, if forcing media */
 494                 else {
 495                         new_bmcr = mii_reg0 & ~BMCR_ANENABLE;
 496                         if (new_bmcr != mii_reg0)
 497                                 ane_switch = 1;
 498                 }
 499
 500                 /* clear out bits we never want at this point */
 501                 new_bmcr &= ~(BMCR_CTST | BMCR_FULLDPLX | BMCR_ISOLATE |
 502                               BMCR_PDOWN | BMCR_SPEED100 | BMCR_LOOPBACK |
 503                               BMCR_RESET);
 504
 505                 if (tp->full_duplex)
 506                         new_bmcr |= BMCR_FULLDPLX;
 507                 if (tulip_media_cap[tp->default_port] & MediaIs100)
 508                         new_bmcr |= BMCR_SPEED100;
 509
 510                 if (new_bmcr != mii_reg0) {
 511                         /* some phys need the ANE switch to
 512                          * happen before forced media settings
 513                          * will "take."  However, we write the
 514                          * same value twice in order not to
 515                          * confuse the sane phys.
 516                          */
 517                         if (ane_switch) {
 518                                 tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
 519                                 udelay (10);
 520                         }
 521                         tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
 522                 }
 523         }
 524         tp->mii_cnt = phy_idx;
 525         if (tp->mtable && tp->mtable->has_mii && phy_idx == 0) {
 526                 printk (KERN_INFO "tulip%d: ***WARNING***: No MII transceiver found!\n",
 527                         board_idx);
 528                 tp->phys[0] = 1;
 529         }
 530 }