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   1 /*
   2         drivers/net/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 refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
  11         for more information on this driver.
  12
  13         Please submit bugs to http://bugzilla.kernel.org/ .
  14 */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/mii.h>
  18 #include <linux/init.h>
  19 #include <linux/delay.h>
  20 #include <linux/pci.h>
  21 #include "tulip.h"
  22
  23
  24 /* The maximum data clock rate is 2.5 Mhz.  The minimum timing is usually
  25    met by back-to-back PCI I/O cycles, but we insert a delay to avoid
  26    "overclocking" issues or future 66Mhz PCI. */
  27 #define mdio_delay() ioread32(mdio_addr)
  28
  29 /* Read and write the MII registers using software-generated serial
  30    MDIO protocol.  It is just different enough from the EEPROM protocol
  31    to not share code.  The maxium data clock rate is 2.5 Mhz. */
  32 #define MDIO_SHIFT_CLK          0x10000
  33 #define MDIO_DATA_WRITE0        0x00000
  34 #define MDIO_DATA_WRITE1        0x20000
  35 #define MDIO_ENB                0x00000 /* Ignore the 0x02000 databook setting. */
  36 #define MDIO_ENB_IN             0x40000
  37 #define MDIO_DATA_READ          0x80000
  38
  39 static const unsigned char comet_miireg2offset[32] = {
  40         0xB4, 0xB8, 0xBC, 0xC0,  0xC4, 0xC8, 0xCC, 0,  0,0,0,0,  0,0,0,0,
  41         0,0xD0,0,0,  0,0,0,0,  0,0,0,0, 0, 0xD4, 0xD8, 0xDC, };
  42
  43
  44 /* MII transceiver control section.
  45    Read and write the MII registers using software-generated serial
  46    MDIO protocol.
  47    See IEEE 802.3-2002.pdf (Section 2, Chapter "22.2.4 Management functions")
  48    or DP83840A data sheet for more details.
  49    */
  50
  51 int tulip_mdio_read(struct net_device *dev, int phy_id, int location)
  52 {
  53         struct tulip_private *tp = netdev_priv(dev);
  54         int i;
  55         int read_cmd = (0xf6 << 10) | ((phy_id & 0x1f) << 5) | location;
  56         int retval = 0;
  57         void __iomem *ioaddr = tp->base_addr;
  58         void __iomem *mdio_addr = ioaddr + CSR9;
  59         unsigned long flags;
  60
  61         if (location & ~0x1f)
  62                 return 0xffff;
  63
  64         if (tp->chip_id == COMET  &&  phy_id == 30) {
  65                 if (comet_miireg2offset[location])
  66                         return ioread32(ioaddr + comet_miireg2offset[location]);
  67                 return 0xffff;
  68         }
  69
  70         spin_lock_irqsave(&tp->mii_lock, flags);
  71         if (tp->chip_id == LC82C168) {
  72                 iowrite32(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0);
  73                 ioread32(ioaddr + 0xA0);
  74                 ioread32(ioaddr + 0xA0);
  75                 for (i = 1000; i >= 0; --i) {
  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                 iowrite32(cmd, ioaddr + 0xA0);
 134                 for (i = 1000; i >= 0; --i) {
 135                         barrier();
 136                         if ( ! (ioread32(ioaddr + 0xA0) & 0x80000000))
 137                                 break;
 138                 }
 139                 spin_unlock_irqrestore(&tp->mii_lock, flags);
 140                 return;
 141         }
 142
 143         /* Establish sync by sending 32 logic ones. */
 144         for (i = 32; i >= 0; i--) {
 145                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
 146                 mdio_delay();
 147                 iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
 148                 mdio_delay();
 149         }
 150         /* Shift the command bits out. */
 151         for (i = 31; i >= 0; i--) {
 152                 int dataval = (cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
 153                 iowrite32(MDIO_ENB | dataval, mdio_addr);
 154                 mdio_delay();
 155                 iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
 156                 mdio_delay();
 157         }
 158         /* Clear out extra bits. */
 159         for (i = 2; i > 0; i--) {
 160                 iowrite32(MDIO_ENB_IN, mdio_addr);
 161                 mdio_delay();
 162                 iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
 163                 mdio_delay();
 164         }
 165
 166         spin_unlock_irqrestore(&tp->mii_lock, flags);
 167 }
 168
 169
 170 /* Set up the transceiver control registers for the selected media type. */
 171 void tulip_select_media(struct net_device *dev, int startup)
 172 {
 173         struct tulip_private *tp = netdev_priv(dev);
 174         void __iomem *ioaddr = tp->base_addr;
 175         struct mediatable *mtable = tp->mtable;
 176         u32 new_csr6;
 177         int i;
 178
 179         if (mtable) {
 180                 struct medialeaf *mleaf = &mtable->mleaf[tp->cur_index];
 181                 unsigned char *p = mleaf->leafdata;
 182                 switch (mleaf->type) {
 183                 case 0:                                 /* 21140 non-MII xcvr. */
 184                         if (tulip_debug > 1)
 185                                 printk(KERN_DEBUG "%s: Using a 21140 non-MII transceiver"
 186                                            " with control setting %2.2x.\n",
 187                                            dev->name, p[1]);
 188                         dev->if_port = p[0];
 189                         if (startup)
 190                                 iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
 191                         iowrite32(p[1], ioaddr + CSR12);
 192                         new_csr6 = 0x02000000 | ((p[2] & 0x71) << 18);
 193                         break;
 194                 case 2: case 4: {
 195                         u16 setup[5];
 196                         u32 csr13val, csr14val, csr15dir, csr15val;
 197                         for (i = 0; i < 5; i++)
 198                                 setup[i] = get_u16(&p[i*2 + 1]);
 199
 200                         dev->if_port = p[0] & MEDIA_MASK;
 201                         if (tulip_media_cap[dev->if_port] & MediaAlwaysFD)
 202                                 tp->full_duplex = 1;
 203
 204                         if (startup && mtable->has_reset) {
 205                                 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
 206                                 unsigned char *rst = rleaf->leafdata;
 207                                 if (tulip_debug > 1)
 208                                         printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
 209                                                    dev->name);
 210                                 for (i = 0; i < rst[0]; i++)
 211                                         iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
 212                         }
 213                         if (tulip_debug > 1)
 214                                 printk(KERN_DEBUG "%s: 21143 non-MII %s transceiver control "
 215                                            "%4.4x/%4.4x.\n",
 216                                            dev->name, medianame[dev->if_port], setup[0], setup[1]);
 217                         if (p[0] & 0x40) {      /* SIA (CSR13-15) setup values are provided. */
 218                                 csr13val = setup[0];
 219                                 csr14val = setup[1];
 220                                 csr15dir = (setup[3]<<16) | setup[2];
 221                                 csr15val = (setup[4]<<16) | setup[2];
 222                                 iowrite32(0, ioaddr + CSR13);
 223                                 iowrite32(csr14val, ioaddr + CSR14);
 224                                 iowrite32(csr15dir, ioaddr + CSR15);    /* Direction */
 225                                 iowrite32(csr15val, ioaddr + CSR15);    /* Data */
 226                                 iowrite32(csr13val, ioaddr + CSR13);
 227                         } else {
 228                                 csr13val = 1;
 229                                 csr14val = 0;
 230                                 csr15dir = (setup[0]<<16) | 0x0008;
 231                                 csr15val = (setup[1]<<16) | 0x0008;
 232                                 if (dev->if_port <= 4)
 233                                         csr14val = t21142_csr14[dev->if_port];
 234                                 if (startup) {
 235                                         iowrite32(0, ioaddr + CSR13);
 236                                         iowrite32(csr14val, ioaddr + CSR14);
 237                                 }
 238                                 iowrite32(csr15dir, ioaddr + CSR15);    /* Direction */
 239                                 iowrite32(csr15val, ioaddr + CSR15);    /* Data */
 240                                 if (startup) iowrite32(csr13val, ioaddr + CSR13);
 241                         }
 242                         if (tulip_debug > 1)
 243                                 printk(KERN_DEBUG "%s:  Setting CSR15 to %8.8x/%8.8x.\n",
 244                                            dev->name, csr15dir, csr15val);
 245                         if (mleaf->type == 4)
 246                                 new_csr6 = 0x82020000 | ((setup[2] & 0x71) << 18);
 247                         else
 248                                 new_csr6 = 0x82420000;
 249                         break;
 250                 }
 251                 case 1: case 3: {
 252                         int phy_num = p[0];
 253                         int init_length = p[1];
 254                         u16 *misc_info, tmp_info;
 255
 256                         dev->if_port = 11;
 257                         new_csr6 = 0x020E0000;
 258                         if (mleaf->type == 3) { /* 21142 */
 259                                 u16 *init_sequence = (u16*)(p+2);
 260                                 u16 *reset_sequence = &((u16*)(p+3))[init_length];
 261                                 int reset_length = p[2 + init_length*2];
 262                                 misc_info = reset_sequence + reset_length;
 263                                 if (startup) {
 264                                         int timeout = 10;       /* max 1 ms */
 265                                         for (i = 0; i < reset_length; i++)
 266                                                 iowrite32(get_u16(&reset_sequence[i]) << 16, ioaddr + CSR15);
 267
 268                                         /* flush posted writes */
 269                                         ioread32(ioaddr + CSR15);
 270
 271                                         /* Sect 3.10.3 in DP83840A.pdf (p39) */
 272                                         udelay(500);
 273
 274                                         /* Section 4.2 in DP83840A.pdf (p43) */
 275                                         /* and IEEE 802.3 "22.2.4.1.1 Reset" */
 276                                         while (timeout-- &&
 277                                                 (tulip_mdio_read (dev, phy_num, MII_BMCR) & BMCR_RESET))
 278                                                 udelay(100);
 279                                 }
 280                                 for (i = 0; i < init_length; i++)
 281                                         iowrite32(get_u16(&init_sequence[i]) << 16, ioaddr + CSR15);
 282
 283                                 ioread32(ioaddr + CSR15);       /* flush posted writes */
 284                         } else {
 285                                 u8 *init_sequence = p + 2;
 286                                 u8 *reset_sequence = p + 3 + init_length;
 287                                 int reset_length = p[2 + init_length];
 288                                 misc_info = (u16*)(reset_sequence + reset_length);
 289                                 if (startup) {
 290                                         int timeout = 10;       /* max 1 ms */
 291                                         iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
 292                                         for (i = 0; i < reset_length; i++)
 293                                                 iowrite32(reset_sequence[i], ioaddr + CSR12);
 294
 295                                         /* flush posted writes */
 296                                         ioread32(ioaddr + CSR12);
 297
 298                                         /* Sect 3.10.3 in DP83840A.pdf (p39) */
 299                                         udelay(500);
 300
 301                                         /* Section 4.2 in DP83840A.pdf (p43) */
 302                                         /* and IEEE 802.3 "22.2.4.1.1 Reset" */
 303                                         while (timeout-- &&
 304                                                 (tulip_mdio_read (dev, phy_num, MII_BMCR) & BMCR_RESET))
 305                                                 udelay(100);
 306                                 }
 307                                 for (i = 0; i < init_length; i++)
 308                                         iowrite32(init_sequence[i], ioaddr + CSR12);
 309
 310                                 ioread32(ioaddr + CSR12);       /* flush posted writes */
 311                         }
 312
 313                         tmp_info = get_u16(&misc_info[1]);
 314                         if (tmp_info)
 315                                 tp->advertising[phy_num] = tmp_info | 1;
 316                         if (tmp_info && startup < 2) {
 317                                 if (tp->mii_advertise == 0)
 318                                         tp->mii_advertise = tp->advertising[phy_num];
 319                                 if (tulip_debug > 1)
 320                                         printk(KERN_DEBUG "%s:  Advertising %4.4x on MII %d.\n",
 321                                                dev->name, tp->mii_advertise, tp->phys[phy_num]);
 322                                 tulip_mdio_write(dev, tp->phys[phy_num], 4, tp->mii_advertise);
 323                         }
 324                         break;
 325                 }
 326                 case 5: case 6: {
 327                         u16 setup[5];
 328
 329                         new_csr6 = 0; /* FIXME */
 330
 331                         for (i = 0; i < 5; i++)
 332                                 setup[i] = get_u16(&p[i*2 + 1]);
 333
 334                         if (startup && mtable->has_reset) {
 335                                 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
 336                                 unsigned char *rst = rleaf->leafdata;
 337                                 if (tulip_debug > 1)
 338                                         printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
 339                                                    dev->name);
 340                                 for (i = 0; i < rst[0]; i++)
 341                                         iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
 342                         }
 343
 344                         break;
 345                 }
 346                 default:
 347                         printk(KERN_DEBUG "%s:  Invalid media table selection %d.\n",
 348                                            dev->name, mleaf->type);
 349                         new_csr6 = 0x020E0000;
 350                 }
 351                 if (tulip_debug > 1)
 352                         printk(KERN_DEBUG "%s: Using media type %s, CSR12 is %2.2x.\n",
 353                                    dev->name, medianame[dev->if_port],
 354                                    ioread32(ioaddr + CSR12) & 0xff);
 355         } else if (tp->chip_id == LC82C168) {
 356                 if (startup && ! tp->medialock)
 357                         dev->if_port = tp->mii_cnt ? 11 : 0;
 358                 if (tulip_debug > 1)
 359                         printk(KERN_DEBUG "%s: PNIC PHY status is %3.3x, media %s.\n",
 360                                    dev->name, ioread32(ioaddr + 0xB8), medianame[dev->if_port]);
 361                 if (tp->mii_cnt) {
 362                         new_csr6 = 0x810C0000;
 363                         iowrite32(0x0001, ioaddr + CSR15);
 364                         iowrite32(0x0201B07A, ioaddr + 0xB8);
 365                 } else if (startup) {
 366                         /* Start with 10mbps to do autonegotiation. */
 367                         iowrite32(0x32, ioaddr + CSR12);
 368                         new_csr6 = 0x00420000;
 369                         iowrite32(0x0001B078, ioaddr + 0xB8);
 370                         iowrite32(0x0201B078, ioaddr + 0xB8);
 371                 } else if (dev->if_port == 3  ||  dev->if_port == 5) {
 372                         iowrite32(0x33, ioaddr + CSR12);
 373                         new_csr6 = 0x01860000;
 374                         /* Trigger autonegotiation. */
 375                         iowrite32(startup ? 0x0201F868 : 0x0001F868, ioaddr + 0xB8);
 376                 } else {
 377                         iowrite32(0x32, ioaddr + CSR12);
 378                         new_csr6 = 0x00420000;
 379                         iowrite32(0x1F078, ioaddr + 0xB8);
 380                 }
 381         } else {                                        /* Unknown chip type with no media table. */
 382                 if (tp->default_port == 0)
 383                         dev->if_port = tp->mii_cnt ? 11 : 3;
 384                 if (tulip_media_cap[dev->if_port] & MediaIsMII) {
 385                         new_csr6 = 0x020E0000;
 386                 } else if (tulip_media_cap[dev->if_port] & MediaIsFx) {
 387                         new_csr6 = 0x02860000;
 388                 } else
 389                         new_csr6 = 0x03860000;
 390                 if (tulip_debug > 1)
 391                         printk(KERN_DEBUG "%s: No media description table, assuming "
 392                                    "%s transceiver, CSR12 %2.2x.\n",
 393                                    dev->name, medianame[dev->if_port],
 394                                    ioread32(ioaddr + CSR12));
 395         }
 396
 397         tp->csr6 = new_csr6 | (tp->csr6 & 0xfdff) | (tp->full_duplex ? 0x0200 : 0);
 398
 399         mdelay(1);
 400
 401         return;
 402 }
 403
 404 /*
 405   Check the MII negotiated duplex and change the CSR6 setting if
 406   required.
 407   Return 0 if everything is OK.
 408   Return < 0 if the transceiver is missing or has no link beat.
 409   */
 410 int tulip_check_duplex(struct net_device *dev)
 411 {
 412         struct tulip_private *tp = netdev_priv(dev);
 413         unsigned int bmsr, lpa, negotiated, new_csr6;
 414
 415         bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
 416         lpa = tulip_mdio_read(dev, tp->phys[0], MII_LPA);
 417         if (tulip_debug > 1)
 418                 printk(KERN_INFO "%s: MII status %4.4x, Link partner report "
 419                            "%4.4x.\n", dev->name, bmsr, lpa);
 420         if (bmsr == 0xffff)
 421                 return -2;
 422         if ((bmsr & BMSR_LSTATUS) == 0) {
 423                 int new_bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
 424                 if ((new_bmsr & BMSR_LSTATUS) == 0) {
 425                         if (tulip_debug  > 1)
 426                                 printk(KERN_INFO "%s: No link beat on the MII interface,"
 427                                            " status %4.4x.\n", dev->name, new_bmsr);
 428                         return -1;
 429                 }
 430         }
 431         negotiated = lpa & tp->advertising[0];
 432         tp->full_duplex = mii_duplex(tp->full_duplex_lock, negotiated);
 433
 434         new_csr6 = tp->csr6;
 435
 436         if (negotiated & LPA_100) new_csr6 &= ~TxThreshold;
 437         else                      new_csr6 |= TxThreshold;
 438         if (tp->full_duplex) new_csr6 |= FullDuplex;
 439         else                 new_csr6 &= ~FullDuplex;
 440
 441         if (new_csr6 != tp->csr6) {
 442                 tp->csr6 = new_csr6;
 443                 tulip_restart_rxtx(tp);
 444
 445                 if (tulip_debug > 0)
 446                         printk(KERN_INFO "%s: Setting %s-duplex based on MII"
 447                                    "#%d link partner capability of %4.4x.\n",
 448                                    dev->name, tp->full_duplex ? "full" : "half",
 449                                    tp->phys[0], lpa);
 450                 return 1;
 451         }
 452
 453         return 0;
 454 }
 455
 456 void __devinit tulip_find_mii (struct net_device *dev, int board_idx)
 457 {
 458         struct tulip_private *tp = netdev_priv(dev);
 459         int phyn, phy_idx = 0;
 460         int mii_reg0;
 461         int mii_advert;
 462         unsigned int to_advert, new_bmcr, ane_switch;
 463
 464         /* Find the connected MII xcvrs.
 465            Doing this in open() would allow detecting external xcvrs later,
 466            but takes much time. */
 467         for (phyn = 1; phyn <= 32 && phy_idx < sizeof (tp->phys); phyn++) {
 468                 int phy = phyn & 0x1f;
 469                 int mii_status = tulip_mdio_read (dev, phy, MII_BMSR);
 470                 if ((mii_status & 0x8301) == 0x8001 ||
 471                     ((mii_status & BMSR_100BASE4) == 0
 472                      && (mii_status & 0x7800) != 0)) {
 473                         /* preserve Becker logic, gain indentation level */
 474                 } else {
 475                         continue;
 476                 }
 477
 478                 mii_reg0 = tulip_mdio_read (dev, phy, MII_BMCR);
 479                 mii_advert = tulip_mdio_read (dev, phy, MII_ADVERTISE);
 480                 ane_switch = 0;
 481
 482                 /* if not advertising at all, gen an
 483                  * advertising value from the capability
 484                  * bits in BMSR
 485                  */
 486                 if ((mii_advert & ADVERTISE_ALL) == 0) {
 487                         unsigned int tmpadv = tulip_mdio_read (dev, phy, MII_BMSR);
 488                         mii_advert = ((tmpadv >> 6) & 0x3e0) | 1;
 489                 }
 490
 491                 if (tp->mii_advertise) {
 492                         tp->advertising[phy_idx] =
 493                         to_advert = tp->mii_advertise;
 494                 } else if (tp->advertising[phy_idx]) {
 495                         to_advert = tp->advertising[phy_idx];
 496                 } else {
 497                         tp->advertising[phy_idx] =
 498                         tp->mii_advertise =
 499                         to_advert = mii_advert;
 500                 }
 501
 502                 tp->phys[phy_idx++] = phy;
 503
 504                 printk (KERN_INFO "tulip%d:  MII transceiver #%d "
 505                         "config %4.4x status %4.4x advertising %4.4x.\n",
 506                         board_idx, phy, mii_reg0, mii_status, mii_advert);
 507
 508                 /* Fixup for DLink with miswired PHY. */
 509                 if (mii_advert != to_advert) {
 510                         printk (KERN_DEBUG "tulip%d:  Advertising %4.4x on PHY %d,"
 511                                 " previously advertising %4.4x.\n",
 512                                 board_idx, to_advert, phy, mii_advert);
 513                         tulip_mdio_write (dev, phy, 4, to_advert);
 514                 }
 515
 516                 /* Enable autonegotiation: some boards default to off. */
 517                 if (tp->default_port == 0) {
 518                         new_bmcr = mii_reg0 | BMCR_ANENABLE;
 519                         if (new_bmcr != mii_reg0) {
 520                                 new_bmcr |= BMCR_ANRESTART;
 521                                 ane_switch = 1;
 522                         }
 523                 }
 524                 /* ...or disable nway, if forcing media */
 525                 else {
 526                         new_bmcr = mii_reg0 & ~BMCR_ANENABLE;
 527                         if (new_bmcr != mii_reg0)
 528                                 ane_switch = 1;
 529                 }
 530
 531                 /* clear out bits we never want at this point */
 532                 new_bmcr &= ~(BMCR_CTST | BMCR_FULLDPLX | BMCR_ISOLATE |
 533                               BMCR_PDOWN | BMCR_SPEED100 | BMCR_LOOPBACK |
 534                               BMCR_RESET);
 535
 536                 if (tp->full_duplex)
 537                         new_bmcr |= BMCR_FULLDPLX;
 538                 if (tulip_media_cap[tp->default_port] & MediaIs100)
 539                         new_bmcr |= BMCR_SPEED100;
 540
 541                 if (new_bmcr != mii_reg0) {
 542                         /* some phys need the ANE switch to
 543                          * happen before forced media settings
 544                          * will "take."  However, we write the
 545                          * same value twice in order not to
 546                          * confuse the sane phys.
 547                          */
 548                         if (ane_switch) {
 549                                 tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
 550                                 udelay (10);
 551                         }
 552                         tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
 553                 }
 554         }
 555         tp->mii_cnt = phy_idx;
 556         if (tp->mtable && tp->mtable->has_mii && phy_idx == 0) {
 557                 printk (KERN_INFO "tulip%d: ***WARNING***: No MII transceiver found!\n",
 558                         board_idx);
 559                 tp->phys[0] = 1;
 560         }
 561 }