linux/drivers/net/ethernet/dec/tulip/pnic2.c
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   1/*
   2        drivers/net/ethernet/dec/tulip/pnic2.c
   3
   4        Copyright 2000,2001  The Linux Kernel Team
   5        Written/copyright 1994-2001 by Donald Becker.
   6        Modified to hep support PNIC_II by Kevin B. Hendricks
   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 submit bugs to http://bugzilla.kernel.org/ .
  12*/
  13
  14
  15/* Understanding the PNIC_II - everything is this file is based
  16 * on the PNIC_II_PDF datasheet which is sorely lacking in detail
  17 *
  18 * As I understand things, here are the registers and bits that
  19 * explain the masks and constants used in this file that are
  20 * either different from the 21142/3 or important for basic operation.
  21 *
  22 *
  23 * CSR 6  (mask = 0xfe3bd1fd of bits not to change)
  24 * -----
  25 * Bit 24    - SCR
  26 * Bit 23    - PCS
  27 * Bit 22    - TTM (Trasmit Threshold Mode)
  28 * Bit 18    - Port Select
  29 * Bit 13    - Start - 1, Stop - 0 Transmissions
  30 * Bit 11:10 - Loop Back Operation Mode
  31 * Bit 9     - Full Duplex mode (Advertise 10BaseT-FD is CSR14<7> is set)
  32 * Bit 1     - Start - 1, Stop - 0 Receive
  33 *
  34 *
  35 * CSR 14  (mask = 0xfff0ee39 of bits not to change)
  36 * ------
  37 * Bit 19    - PAUSE-Pause
  38 * Bit 18    - Advertise T4
  39 * Bit 17    - Advertise 100baseTx-FD
  40 * Bit 16    - Advertise 100baseTx-HD
  41 * Bit 12    - LTE - Link Test Enable
  42 * Bit 7     - ANE - Auto Negotiate Enable
  43 * Bit 6     - HDE - Advertise 10baseT-HD
  44 * Bit 2     - Reset to Power down - kept as 1 for normal operation
  45 * Bit 1     -  Loop Back enable for 10baseT MCC
  46 *
  47 *
  48 * CSR 12
  49 * ------
  50 * Bit 25    - Partner can do T4
  51 * Bit 24    - Partner can do 100baseTx-FD
  52 * Bit 23    - Partner can do 100baseTx-HD
  53 * Bit 22    - Partner can do 10baseT-FD
  54 * Bit 21    - Partner can do 10baseT-HD
  55 * Bit 15    - LPN is 1 if all above bits are valid other wise 0
  56 * Bit 14:12 - autonegotiation state (write 001 to start autonegotiate)
  57 * Bit 3     - Autopolarity state
  58 * Bit 2     - LS10B - link state of 10baseT 0 - good, 1 - failed
  59 * Bit 1     - LS100B - link state of 100baseT 0 - good, 1 - failed
  60 *
  61 *
  62 * Data Port Selection Info
  63 *-------------------------
  64 *
  65 * CSR14<7>   CSR6<18>    CSR6<22>    CSR6<23>    CSR6<24>   MODE/PORT
  66 *   1           0           0 (X)       0 (X)       1        NWAY
  67 *   0           0           1           0 (X)       0        10baseT
  68 *   0           1           0           1           1 (X)    100baseT
  69 *
  70 *
  71 */
  72
  73
  74
  75#include "tulip.h"
  76#include <linux/delay.h>
  77
  78
  79void pnic2_timer(unsigned long data)
  80{
  81        struct net_device *dev = (struct net_device *)data;
  82        struct tulip_private *tp = netdev_priv(dev);
  83        void __iomem *ioaddr = tp->base_addr;
  84        int next_tick = 60*HZ;
  85
  86        if (tulip_debug > 3)
  87                dev_info(&dev->dev, "PNIC2 negotiation status %08x\n",
  88                         ioread32(ioaddr + CSR12));
  89
  90        if (next_tick) {
  91                mod_timer(&tp->timer, RUN_AT(next_tick));
  92        }
  93}
  94
  95
  96void pnic2_start_nway(struct net_device *dev)
  97{
  98        struct tulip_private *tp = netdev_priv(dev);
  99        void __iomem *ioaddr = tp->base_addr;
 100        int csr14;
 101        int csr12;
 102
 103        /* set up what to advertise during the negotiation */
 104
 105        /* load in csr14  and mask off bits not to touch
 106         * comment at top of file explains mask value
 107         */
 108        csr14 = (ioread32(ioaddr + CSR14) & 0xfff0ee39);
 109
 110        /* bit 17 - advetise 100baseTx-FD */
 111        if (tp->sym_advertise & 0x0100) csr14 |= 0x00020000;
 112
 113        /* bit 16 - advertise 100baseTx-HD */
 114        if (tp->sym_advertise & 0x0080) csr14 |= 0x00010000;
 115
 116        /* bit 6 - advertise 10baseT-HD */
 117        if (tp->sym_advertise & 0x0020) csr14 |= 0x00000040;
 118
 119        /* Now set bit 12 Link Test Enable, Bit 7 Autonegotiation Enable
 120         * and bit 0 Don't PowerDown 10baseT
 121         */
 122        csr14 |= 0x00001184;
 123
 124        if (tulip_debug > 1)
 125                netdev_dbg(dev, "Restarting PNIC2 autonegotiation, csr14=%08x\n",
 126                           csr14);
 127
 128        /* tell pnic2_lnk_change we are doing an nway negotiation */
 129        dev->if_port = 0;
 130        tp->nway = tp->mediasense = 1;
 131        tp->nwayset = tp->lpar = 0;
 132
 133        /* now we have to set up csr6 for NWAY state */
 134
 135        tp->csr6 = ioread32(ioaddr + CSR6);
 136        if (tulip_debug > 1)
 137                netdev_dbg(dev, "On Entry to Nway, csr6=%08x\n", tp->csr6);
 138
 139        /* mask off any bits not to touch
 140         * comment at top of file explains mask value
 141         */
 142        tp->csr6 = tp->csr6 & 0xfe3bd1fd;
 143
 144        /* don't forget that bit 9 is also used for advertising */
 145        /* advertise 10baseT-FD for the negotiation (bit 9) */
 146        if (tp->sym_advertise & 0x0040) tp->csr6 |= 0x00000200;
 147
 148        /* set bit 24 for nway negotiation mode ...
 149         * see Data Port Selection comment at top of file
 150         * and "Stop" - reset both Transmit (bit 13) and Receive (bit 1)
 151         */
 152        tp->csr6 |= 0x01000000;
 153        iowrite32(csr14, ioaddr + CSR14);
 154        iowrite32(tp->csr6, ioaddr + CSR6);
 155        udelay(100);
 156
 157        /* all set up so now force the negotiation to begin */
 158
 159        /* read in current values and mask off all but the
 160         * Autonegotiation bits 14:12.  Writing a 001 to those bits
 161         * should start the autonegotiation
 162         */
 163        csr12 = (ioread32(ioaddr + CSR12) & 0xffff8fff);
 164        csr12 |= 0x1000;
 165        iowrite32(csr12, ioaddr + CSR12);
 166}
 167
 168
 169
 170void pnic2_lnk_change(struct net_device *dev, int csr5)
 171{
 172        struct tulip_private *tp = netdev_priv(dev);
 173        void __iomem *ioaddr = tp->base_addr;
 174        int csr14;
 175
 176        /* read the staus register to find out what is up */
 177        int csr12 = ioread32(ioaddr + CSR12);
 178
 179        if (tulip_debug > 1)
 180                dev_info(&dev->dev,
 181                         "PNIC2 link status interrupt %08x,  CSR5 %x, %08x\n",
 182                         csr12, csr5, ioread32(ioaddr + CSR14));
 183
 184        /* If NWay finished and we have a negotiated partner capability.
 185         * check bits 14:12 for bit pattern 101 - all is good
 186         */
 187        if (tp->nway  &&  !tp->nwayset) {
 188
 189                /* we did an auto negotiation */
 190
 191                if ((csr12 & 0x7000) == 0x5000) {
 192
 193                       /* negotiation ended successfully */
 194
 195                       /* get the link partners reply and mask out all but
 196                        * bits 24-21 which show the partners capabilities
 197                        * and match those to what we advertised
 198                        *
 199                        * then begin to interpret the results of the negotiation.
 200                        * Always go in this order : (we are ignoring T4 for now)
 201                        *     100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD
 202                        */
 203
 204                        int negotiated = ((csr12 >> 16) & 0x01E0) & tp->sym_advertise;
 205                        tp->lpar = (csr12 >> 16);
 206                        tp->nwayset = 1;
 207
 208                        if (negotiated & 0x0100)        dev->if_port = 5;
 209                        else if (negotiated & 0x0080)   dev->if_port = 3;
 210                        else if (negotiated & 0x0040)   dev->if_port = 4;
 211                        else if (negotiated & 0x0020)   dev->if_port = 0;
 212                        else {
 213                             if (tulip_debug > 1)
 214                                     dev_info(&dev->dev,
 215                                              "funny autonegotiate result csr12 %08x advertising %04x\n",
 216                                              csr12, tp->sym_advertise);
 217                             tp->nwayset = 0;
 218                             /* so check  if 100baseTx link state is okay */
 219                             if ((csr12 & 2) == 0  &&  (tp->sym_advertise & 0x0180))
 220                               dev->if_port = 3;
 221                        }
 222
 223                        /* now record the duplex that was negotiated */
 224                        tp->full_duplex = 0;
 225                        if ((dev->if_port == 4) || (dev->if_port == 5))
 226                               tp->full_duplex = 1;
 227
 228                        if (tulip_debug > 1) {
 229                               if (tp->nwayset)
 230                                       dev_info(&dev->dev,
 231                                                "Switching to %s based on link negotiation %04x & %04x = %04x\n",
 232                                                medianame[dev->if_port],
 233                                                tp->sym_advertise, tp->lpar,
 234                                                negotiated);
 235                        }
 236
 237                        /* remember to turn off bit 7 - autonegotiate
 238                         * enable so we can properly end nway mode and
 239                         * set duplex (ie. use csr6<9> again)
 240                         */
 241                        csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
 242                        iowrite32(csr14,ioaddr + CSR14);
 243
 244
 245                        /* now set the data port and operating mode
 246                         * (see the Data Port Selection comments at
 247                         * the top of the file
 248                         */
 249
 250                        /* get current csr6 and mask off bits not to touch */
 251                        /* see comment at top of file */
 252
 253                        tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
 254
 255                        /* so if using if_port 3 or 5 then select the 100baseT
 256                         * port else select the 10baseT port.
 257                         * See the Data Port Selection table at the top
 258                         * of the file which was taken from the PNIC_II.PDF
 259                         * datasheet
 260                         */
 261                        if (dev->if_port & 1) tp->csr6 |= 0x01840000;
 262                        else tp->csr6 |= 0x00400000;
 263
 264                        /* now set the full duplex bit appropriately */
 265                        if (tp->full_duplex) tp->csr6 |= 0x00000200;
 266
 267                        iowrite32(1, ioaddr + CSR13);
 268
 269                        if (tulip_debug > 2)
 270                                netdev_dbg(dev, "Setting CSR6 %08x/%x CSR12 %08x\n",
 271                                           tp->csr6,
 272                                           ioread32(ioaddr + CSR6),
 273                                           ioread32(ioaddr + CSR12));
 274
 275                        /* now the following actually writes out the
 276                         * new csr6 values
 277                         */
 278                        tulip_start_rxtx(tp);
 279
 280                        return;
 281
 282                } else {
 283                        dev_info(&dev->dev,
 284                                 "Autonegotiation failed, using %s, link beat status %04x\n",
 285                                 medianame[dev->if_port], csr12);
 286
 287                        /* remember to turn off bit 7 - autonegotiate
 288                         * enable so we don't forget
 289                         */
 290                        csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
 291                        iowrite32(csr14,ioaddr + CSR14);
 292
 293                        /* what should we do when autonegotiate fails?
 294                         * should we try again or default to baseline
 295                         * case.  I just don't know.
 296                         *
 297                         * for now default to some baseline case
 298                         */
 299
 300                         dev->if_port = 0;
 301                         tp->nway = 0;
 302                         tp->nwayset = 1;
 303
 304                         /* set to 10baseTx-HD - see Data Port Selection
 305                          * comment given at the top of the file
 306                          */
 307                         tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
 308                         tp->csr6 |= 0x00400000;
 309
 310                         tulip_restart_rxtx(tp);
 311
 312                         return;
 313
 314                }
 315        }
 316
 317        if ((tp->nwayset  &&  (csr5 & 0x08000000) &&
 318             (dev->if_port == 3  ||  dev->if_port == 5) &&
 319             (csr12 & 2) == 2) || (tp->nway && (csr5 & (TPLnkFail)))) {
 320
 321                /* Link blew? Maybe restart NWay. */
 322
 323                if (tulip_debug > 2)
 324                        netdev_dbg(dev, "Ugh! Link blew?\n");
 325
 326                del_timer_sync(&tp->timer);
 327                pnic2_start_nway(dev);
 328                tp->timer.expires = RUN_AT(3*HZ);
 329                add_timer(&tp->timer);
 330
 331                return;
 332        }
 333
 334
 335        if (dev->if_port == 3  ||  dev->if_port == 5) {
 336
 337                /* we are at 100mb and a potential link change occurred */
 338
 339                if (tulip_debug > 1)
 340                        dev_info(&dev->dev, "PNIC2 %s link beat %s\n",
 341                                 medianame[dev->if_port],
 342                                 (csr12 & 2) ? "failed" : "good");
 343
 344                /* check 100 link beat */
 345
 346                tp->nway = 0;
 347                tp->nwayset = 1;
 348
 349                /* if failed then try doing an nway to get in sync */
 350                if ((csr12 & 2)  &&  ! tp->medialock) {
 351                        del_timer_sync(&tp->timer);
 352                        pnic2_start_nway(dev);
 353                        tp->timer.expires = RUN_AT(3*HZ);
 354                        add_timer(&tp->timer);
 355                }
 356
 357                return;
 358        }
 359
 360        if (dev->if_port == 0  ||  dev->if_port == 4) {
 361
 362                /* we are at 10mb and a potential link change occurred */
 363
 364                if (tulip_debug > 1)
 365                        dev_info(&dev->dev, "PNIC2 %s link beat %s\n",
 366                                 medianame[dev->if_port],
 367                                 (csr12 & 4) ? "failed" : "good");
 368
 369
 370                tp->nway = 0;
 371                tp->nwayset = 1;
 372
 373                /* if failed, try doing an nway to get in sync */
 374                if ((csr12 & 4)  &&  ! tp->medialock) {
 375                        del_timer_sync(&tp->timer);
 376                        pnic2_start_nway(dev);
 377                        tp->timer.expires = RUN_AT(3*HZ);
 378                        add_timer(&tp->timer);
 379                }
 380
 381                return;
 382        }
 383
 384
 385        if (tulip_debug > 1)
 386                dev_info(&dev->dev, "PNIC2 Link Change Default?\n");
 387
 388        /* if all else fails default to trying 10baseT-HD */
 389        dev->if_port = 0;
 390
 391        /* make sure autonegotiate enable is off */
 392        csr14 = (ioread32(ioaddr + CSR14) & 0xffffff7f);
 393        iowrite32(csr14,ioaddr + CSR14);
 394
 395        /* set to 10baseTx-HD - see Data Port Selection
 396         * comment given at the top of the file
 397         */
 398        tp->csr6 = (ioread32(ioaddr + CSR6) & 0xfe3bd1fd);
 399        tp->csr6 |= 0x00400000;
 400
 401        tulip_restart_rxtx(tp);
 402}
 403
 404