drivers/net/tulip/media.c

   1 /*
   2         drivers/net/tulip/media.c
   3
   4         Maintained by Jeff Garzik <jgarzik@pobox.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         if(tp->chip_id == ULI526X && tp->revision >= 0x40) {
  85                 int value;
  86                 int i = 1000;
  87
  88                 value = ioread32(ioaddr + CSR9);
  89                 iowrite32(value & 0xFFEFFFFF, ioaddr + CSR9);
  90
  91                 value = (phy_id << 21) | (location << 16) | 0x08000000;
  92                 iowrite32(value, ioaddr + CSR10);
  93
  94                 while(--i > 0) {
  95                         mdio_delay();
  96                         if(ioread32(ioaddr + CSR10) & 0x10000000)
  97                                 break;
  98                 }
  99                 retval = ioread32(ioaddr + CSR10);
 100                 spin_unlock_irqrestore(&tp->mii_lock, flags);
 101                 return retval & 0xFFFF;
 102         }
 103         /* Establish sync by sending at least 32 logic ones. */
 104         for (i = 32; i >= 0; i--) {
 105                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
 106                 mdio_delay();
 107                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
 108                 mdio_delay();
 109         }
 110         /* Shift the read command bits out. */
 111         for (i = 15; i >= 0; i--) {
 112                 int dataval = (read_cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
 113
 114                 iowrite32(MDIO_ENB | dataval, mdio_addr);
 115                 mdio_delay();
 116                 iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
 117                 mdio_delay();
 118         }
 119         /* Read the two transition, 16 data, and wire-idle bits. */
 120         for (i = 19; i > 0; i--) {
 121                 iowrite32(MDIO_ENB_IN, mdio_addr);
 122                 mdio_delay();
 123                 retval = (retval << 1) | ((ioread32(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
 124                 iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
 125                 mdio_delay();
 126         }
 127
 128         spin_unlock_irqrestore(&tp->mii_lock, flags);
 129         return (retval>>1) & 0xffff;
 130 }
 131
 132 void tulip_mdio_write(struct net_device *dev, int phy_id, int location, int val)
 133 {
 134         struct tulip_private *tp = netdev_priv(dev);
 135         int i;
 136         int cmd = (0x5002 << 16) | ((phy_id & 0x1f) << 23) | (location<<18) | (val & 0xffff);
 137         void __iomem *ioaddr = tp->base_addr;
 138         void __iomem *mdio_addr = ioaddr + CSR9;
 139         unsigned long flags;
 140
 141         if (location & ~0x1f)
 142                 return;
 143
 144         if (tp->chip_id == COMET && phy_id == 30) {
 145                 if (comet_miireg2offset[location])
 146                         iowrite32(val, ioaddr + comet_miireg2offset[location]);
 147                 return;
 148         }
 149
 150         spin_lock_irqsave(&tp->mii_lock, flags);
 151         if (tp->chip_id == LC82C168) {
 152                 int i = 1000;
 153                 iowrite32(cmd, ioaddr + 0xA0);
 154                 do {
 155                         barrier();
 156                         if ( ! (ioread32(ioaddr + 0xA0) & 0x80000000))
 157                                 break;
 158                 } while (--i > 0);
 159                 spin_unlock_irqrestore(&tp->mii_lock, flags);
 160                 return;
 161         }
 162         if (tp->chip_id == ULI526X && tp->revision >= 0x40) {
 163                 int value;
 164                 int i = 1000;
 165
 166                 value = ioread32(ioaddr + CSR9);
 167                 iowrite32(value & 0xFFEFFFFF, ioaddr + CSR9);
 168
 169                 value = (phy_id << 21) | (location << 16) | 0x04000000 | (val & 0xFFFF);
 170                 iowrite32(value, ioaddr + CSR10);
 171
 172                 while(--i > 0) {
 173                         if (ioread32(ioaddr + CSR10) & 0x10000000)
 174                                 break;
 175                 }
 176                 spin_unlock_irqrestore(&tp->mii_lock, flags);
 177                 return;
 178         }
 179
 180         /* Establish sync by sending 32 logic ones. */
 181         for (i = 32; i >= 0; i--) {
 182                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
 183                 mdio_delay();
 184                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
 185                 mdio_delay();
 186         }
 187         /* Shift the command bits out. */
 188         for (i = 31; i >= 0; i--) {
 189                 int dataval = (cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
 190                 iowrite32(MDIO_ENB | dataval, mdio_addr);
 191                 mdio_delay();
 192                 iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
 193                 mdio_delay();
 194         }
 195         /* Clear out extra bits. */
 196         for (i = 2; i > 0; i--) {
 197                 iowrite32(MDIO_ENB_IN, mdio_addr);
 198                 mdio_delay();
 199                 iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
 200                 mdio_delay();
 201         }
 202
 203         spin_unlock_irqrestore(&tp->mii_lock, flags);
 204 }
 205
 206
 207 /* Set up the transceiver control registers for the selected media type. */
 208 void tulip_select_media(struct net_device *dev, int startup)
 209 {
 210         struct tulip_private *tp = netdev_priv(dev);
 211         void __iomem *ioaddr = tp->base_addr;
 212         struct mediatable *mtable = tp->mtable;
 213         u32 new_csr6;
 214         int i;
 215
 216         if (mtable) {
 217                 struct medialeaf *mleaf = &mtable->mleaf[tp->cur_index];
 218                 unsigned char *p = mleaf->leafdata;
 219                 switch (mleaf->type) {
 220                 case 0:                                 /* 21140 non-MII xcvr. */
 221                         if (tulip_debug > 1)
 222                                 printk(KERN_DEBUG "%s: Using a 21140 non-MII transceiver"
 223                                            " with control setting %2.2x.\n",
 224                                            dev->name, p[1]);
 225                         dev->if_port = p[0];
 226                         if (startup)
 227                                 iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
 228                         iowrite32(p[1], ioaddr + CSR12);
 229                         new_csr6 = 0x02000000 | ((p[2] & 0x71) << 18);
 230                         break;
 231                 case 2: case 4: {
 232                         u16 setup[5];
 233                         u32 csr13val, csr14val, csr15dir, csr15val;
 234                         for (i = 0; i < 5; i++)
 235                                 setup[i] = get_u16(&p[i*2 + 1]);
 236
 237                         dev->if_port = p[0] & MEDIA_MASK;
 238                         if (tulip_media_cap[dev->if_port] & MediaAlwaysFD)
 239                                 tp->full_duplex = 1;
 240
 241                         if (startup && mtable->has_reset) {
 242                                 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
 243                                 unsigned char *rst = rleaf->leafdata;
 244                                 if (tulip_debug > 1)
 245                                         printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
 246                                                    dev->name);
 247                                 for (i = 0; i < rst[0]; i++)
 248                                         iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
 249                         }
 250                         if (tulip_debug > 1)
 251                                 printk(KERN_DEBUG "%s: 21143 non-MII %s transceiver control "
 252                                            "%4.4x/%4.4x.\n",
 253                                            dev->name, medianame[dev->if_port], setup[0], setup[1]);
 254                         if (p[0] & 0x40) {      /* SIA (CSR13-15) setup values are provided. */
 255                                 csr13val = setup[0];
 256                                 csr14val = setup[1];
 257                                 csr15dir = (setup[3]<<16) | setup[2];
 258                                 csr15val = (setup[4]<<16) | setup[2];
 259                                 iowrite32(0, ioaddr + CSR13);
 260                                 iowrite32(csr14val, ioaddr + CSR14);
 261                                 iowrite32(csr15dir, ioaddr + CSR15);    /* Direction */
 262                                 iowrite32(csr15val, ioaddr + CSR15);    /* Data */
 263                                 iowrite32(csr13val, ioaddr + CSR13);
 264                         } else {
 265                                 csr13val = 1;
 266                                 csr14val = 0;
 267                                 csr15dir = (setup[0]<<16) | 0x0008;
 268                                 csr15val = (setup[1]<<16) | 0x0008;
 269                                 if (dev->if_port <= 4)
 270                                         csr14val = t21142_csr14[dev->if_port];
 271                                 if (startup) {
 272                                         iowrite32(0, ioaddr + CSR13);
 273                                         iowrite32(csr14val, ioaddr + CSR14);
 274                                 }
 275                                 iowrite32(csr15dir, ioaddr + CSR15);    /* Direction */
 276                                 iowrite32(csr15val, ioaddr + CSR15);    /* Data */
 277                                 if (startup) iowrite32(csr13val, ioaddr + CSR13);
 278                         }
 279                         if (tulip_debug > 1)
 280                                 printk(KERN_DEBUG "%s:  Setting CSR15 to %8.8x/%8.8x.\n",
 281                                            dev->name, csr15dir, csr15val);
 282                         if (mleaf->type == 4)
 283                                 new_csr6 = 0x82020000 | ((setup[2] & 0x71) << 18);
 284                         else
 285                                 new_csr6 = 0x82420000;
 286                         break;
 287                 }
 288                 case 1: case 3: {
 289                         int phy_num = p[0];
 290                         int init_length = p[1];
 291                         u16 *misc_info, tmp_info;
 292
 293                         dev->if_port = 11;
 294                         new_csr6 = 0x020E0000;
 295                         if (mleaf->type == 3) { /* 21142 */
 296                                 u16 *init_sequence = (u16*)(p+2);
 297                                 u16 *reset_sequence = &((u16*)(p+3))[init_length];
 298                                 int reset_length = p[2 + init_length*2];
 299                                 misc_info = reset_sequence + reset_length;
 300                                 if (startup)
 301                                         for (i = 0; i < reset_length; i++)
 302                                                 iowrite32(get_u16(&reset_sequence[i]) << 16, ioaddr + CSR15);
 303                                 for (i = 0; i < init_length; i++)
 304                                         iowrite32(get_u16(&init_sequence[i]) << 16, ioaddr + CSR15);
 305                         } else {
 306                                 u8 *init_sequence = p + 2;
 307                                 u8 *reset_sequence = p + 3 + init_length;
 308                                 int reset_length = p[2 + init_length];
 309                                 misc_info = (u16*)(reset_sequence + reset_length);
 310                                 if (startup) {
 311                                         iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
 312                                         for (i = 0; i < reset_length; i++)
 313                                                 iowrite32(reset_sequence[i], ioaddr + CSR12);
 314                                 }
 315                                 for (i = 0; i < init_length; i++)
 316                                         iowrite32(init_sequence[i], ioaddr + CSR12);
 317                         }
 318                         tmp_info = get_u16(&misc_info[1]);
 319                         if (tmp_info)
 320                                 tp->advertising[phy_num] = tmp_info | 1;
 321                         if (tmp_info && startup < 2) {
 322                                 if (tp->mii_advertise == 0)
 323                                         tp->mii_advertise = tp->advertising[phy_num];
 324                                 if (tulip_debug > 1)
 325                                         printk(KERN_DEBUG "%s:  Advertising %4.4x on MII %d.\n",
 326                                                dev->name, tp->mii_advertise, tp->phys[phy_num]);
 327                                 tulip_mdio_write(dev, tp->phys[phy_num], 4, tp->mii_advertise);
 328                         }
 329                         break;
 330                 }
 331                 case 5: case 6: {
 332                         u16 setup[5];
 333
 334                         new_csr6 = 0; /* FIXME */
 335
 336                         for (i = 0; i < 5; i++)
 337                                 setup[i] = get_u16(&p[i*2 + 1]);
 338
 339                         if (startup && mtable->has_reset) {
 340                                 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
 341                                 unsigned char *rst = rleaf->leafdata;
 342                                 if (tulip_debug > 1)
 343                                         printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
 344                                                    dev->name);
 345                                 for (i = 0; i < rst[0]; i++)
 346                                         iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
 347                         }
 348
 349                         break;
 350                 }
 351                 default:
 352                         printk(KERN_DEBUG "%s:  Invalid media table selection %d.\n",
 353                                            dev->name, mleaf->type);
 354                         new_csr6 = 0x020E0000;
 355                 }
 356                 if (tulip_debug > 1)
 357                         printk(KERN_DEBUG "%s: Using media type %s, CSR12 is %2.2x.\n",
 358                                    dev->name, medianame[dev->if_port],
 359                                    ioread32(ioaddr + CSR12) & 0xff);
 360         } else if (tp->chip_id == LC82C168) {
 361                 if (startup && ! tp->medialock)
 362                         dev->if_port = tp->mii_cnt ? 11 : 0;
 363                 if (tulip_debug > 1)
 364                         printk(KERN_DEBUG "%s: PNIC PHY status is %3.3x, media %s.\n",
 365                                    dev->name, ioread32(ioaddr + 0xB8), medianame[dev->if_port]);
 366                 if (tp->mii_cnt) {
 367                         new_csr6 = 0x810C0000;
 368                         iowrite32(0x0001, ioaddr + CSR15);
 369                         iowrite32(0x0201B07A, ioaddr + 0xB8);
 370                 } else if (startup) {
 371                         /* Start with 10mbps to do autonegotiation. */
 372                         iowrite32(0x32, ioaddr + CSR12);
 373                         new_csr6 = 0x00420000;
 374                         iowrite32(0x0001B078, ioaddr + 0xB8);
 375                         iowrite32(0x0201B078, ioaddr + 0xB8);
 376                 } else if (dev->if_port == 3  ||  dev->if_port == 5) {
 377                         iowrite32(0x33, ioaddr + CSR12);
 378                         new_csr6 = 0x01860000;
 379                         /* Trigger autonegotiation. */
 380                         iowrite32(startup ? 0x0201F868 : 0x0001F868, ioaddr + 0xB8);
 381                 } else {
 382                         iowrite32(0x32, ioaddr + CSR12);
 383                         new_csr6 = 0x00420000;
 384                         iowrite32(0x1F078, ioaddr + 0xB8);
 385                 }
 386         } else {                                        /* Unknown chip type with no media table. */
 387                 if (tp->default_port == 0)
 388                         dev->if_port = tp->mii_cnt ? 11 : 3;
 389                 if (tulip_media_cap[dev->if_port] & MediaIsMII) {
 390                         new_csr6 = 0x020E0000;
 391                 } else if (tulip_media_cap[dev->if_port] & MediaIsFx) {
 392                         new_csr6 = 0x02860000;
 393                 } else
 394                         new_csr6 = 0x03860000;
 395                 if (tulip_debug > 1)
 396                         printk(KERN_DEBUG "%s: No media description table, assuming "
 397                                    "%s transceiver, CSR12 %2.2x.\n",
 398                                    dev->name, medianame[dev->if_port],
 399                                    ioread32(ioaddr + CSR12));
 400         }
 401
 402         tp->csr6 = new_csr6 | (tp->csr6 & 0xfdff) | (tp->full_duplex ? 0x0200 : 0);
 403         return;
 404 }
 405
 406 /*
 407   Check the MII negotiated duplex and change the CSR6 setting if
 408   required.
 409   Return 0 if everything is OK.
 410   Return < 0 if the transceiver is missing or has no link beat.
 411   */
 412 int tulip_check_duplex(struct net_device *dev)
 413 {
 414         struct tulip_private *tp = netdev_priv(dev);
 415         unsigned int bmsr, lpa, negotiated, new_csr6;
 416
 417         bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
 418         lpa = tulip_mdio_read(dev, tp->phys[0], MII_LPA);
 419         if (tulip_debug > 1)
 420                 printk(KERN_INFO "%s: MII status %4.4x, Link partner report "
 421                            "%4.4x.\n", dev->name, bmsr, lpa);
 422         if (bmsr == 0xffff)
 423                 return -2;
 424         if ((bmsr & BMSR_LSTATUS) == 0) {
 425                 int new_bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
 426                 if ((new_bmsr & BMSR_LSTATUS) == 0) {
 427                         if (tulip_debug  > 1)
 428                                 printk(KERN_INFO "%s: No link beat on the MII interface,"
 429                                            " status %4.4x.\n", dev->name, new_bmsr);
 430                         return -1;
 431                 }
 432         }
 433         negotiated = lpa & tp->advertising[0];
 434         tp->full_duplex = mii_duplex(tp->full_duplex_lock, negotiated);
 435
 436         new_csr6 = tp->csr6;
 437
 438         if (negotiated & LPA_100) new_csr6 &= ~TxThreshold;
 439         else                      new_csr6 |= TxThreshold;
 440         if (tp->full_duplex) new_csr6 |= FullDuplex;
 441         else                 new_csr6 &= ~FullDuplex;
 442
 443         if (new_csr6 != tp->csr6) {
 444                 tp->csr6 = new_csr6;
 445                 tulip_restart_rxtx(tp);
 446
 447                 if (tulip_debug > 0)
 448                         printk(KERN_INFO "%s: Setting %s-duplex based on MII"
 449                                    "#%d link partner capability of %4.4x.\n",
 450                                    dev->name, tp->full_duplex ? "full" : "half",
 451                                    tp->phys[0], lpa);
 452                 return 1;
 453         }
 454
 455         return 0;
 456 }
 457
 458 void __devinit tulip_find_mii (struct net_device *dev, int board_idx)
 459 {
 460         struct tulip_private *tp = netdev_priv(dev);
 461         int phyn, phy_idx = 0;
 462         int mii_reg0;
 463         int mii_advert;
 464         unsigned int to_advert, new_bmcr, ane_switch;
 465
 466         /* Find the connected MII xcvrs.
 467            Doing this in open() would allow detecting external xcvrs later,
 468            but takes much time. */
 469         for (phyn = 1; phyn <= 32 && phy_idx < sizeof (tp->phys); phyn++) {
 470                 int phy = phyn & 0x1f;
 471                 int mii_status = tulip_mdio_read (dev, phy, MII_BMSR);
 472                 if ((mii_status & 0x8301) == 0x8001 ||
 473                     ((mii_status & BMSR_100BASE4) == 0
 474                      && (mii_status & 0x7800) != 0)) {
 475                         /* preserve Becker logic, gain indentation level */
 476                 } else {
 477                         continue;
 478                 }
 479
 480                 mii_reg0 = tulip_mdio_read (dev, phy, MII_BMCR);
 481                 mii_advert = tulip_mdio_read (dev, phy, MII_ADVERTISE);
 482                 ane_switch = 0;
 483
 484                 /* if not advertising at all, gen an
 485                  * advertising value from the capability
 486                  * bits in BMSR
 487                  */
 488                 if ((mii_advert & ADVERTISE_ALL) == 0) {
 489                         unsigned int tmpadv = tulip_mdio_read (dev, phy, MII_BMSR);
 490                         mii_advert = ((tmpadv >> 6) & 0x3e0) | 1;
 491                 }
 492
 493                 if (tp->mii_advertise) {
 494                         tp->advertising[phy_idx] =
 495                         to_advert = tp->mii_advertise;
 496                 } else if (tp->advertising[phy_idx]) {
 497                         to_advert = tp->advertising[phy_idx];
 498                 } else {
 499                         tp->advertising[phy_idx] =
 500                         tp->mii_advertise =
 501                         to_advert = mii_advert;
 502                 }
 503
 504                 tp->phys[phy_idx++] = phy;
 505
 506                 printk (KERN_INFO "tulip%d:  MII transceiver #%d "
 507                         "config %4.4x status %4.4x advertising %4.4x.\n",
 508                         board_idx, phy, mii_reg0, mii_status, mii_advert);
 509
 510                 /* Fixup for DLink with miswired PHY. */
 511                 if (mii_advert != to_advert) {
 512                         printk (KERN_DEBUG "tulip%d:  Advertising %4.4x on PHY %d,"
 513                                 " previously advertising %4.4x.\n",
 514                                 board_idx, to_advert, phy, mii_advert);
 515                         tulip_mdio_write (dev, phy, 4, to_advert);
 516                 }
 517
 518                 /* Enable autonegotiation: some boards default to off. */
 519                 if (tp->default_port == 0) {
 520                         new_bmcr = mii_reg0 | BMCR_ANENABLE;
 521                         if (new_bmcr != mii_reg0) {
 522                                 new_bmcr |= BMCR_ANRESTART;
 523                                 ane_switch = 1;
 524                         }
 525                 }
 526                 /* ...or disable nway, if forcing media */
 527                 else {
 528                         new_bmcr = mii_reg0 & ~BMCR_ANENABLE;
 529                         if (new_bmcr != mii_reg0)
 530                                 ane_switch = 1;
 531                 }
 532
 533                 /* clear out bits we never want at this point */
 534                 new_bmcr &= ~(BMCR_CTST | BMCR_FULLDPLX | BMCR_ISOLATE |
 535                               BMCR_PDOWN | BMCR_SPEED100 | BMCR_LOOPBACK |
 536                               BMCR_RESET);
 537
 538                 if (tp->full_duplex)
 539                         new_bmcr |= BMCR_FULLDPLX;
 540                 if (tulip_media_cap[tp->default_port] & MediaIs100)
 541                         new_bmcr |= BMCR_SPEED100;
 542
 543                 if (new_bmcr != mii_reg0) {
 544                         /* some phys need the ANE switch to
 545                          * happen before forced media settings
 546                          * will "take."  However, we write the
 547                          * same value twice in order not to
 548                          * confuse the sane phys.
 549                          */
 550                         if (ane_switch) {
 551                                 tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
 552                                 udelay (10);
 553                         }
 554                         tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
 555                 }
 556         }
 557         tp->mii_cnt = phy_idx;
 558         if (tp->mtable && tp->mtable->has_mii && phy_idx == 0) {
 559                 printk (KERN_INFO "tulip%d: ***WARNING***: No MII transceiver found!\n",
 560                         board_idx);
 561                 tp->phys[0] = 1;
 562         }
 563 }