sys/dev/netif/sbsh/if_sbsh.c

   1 /**
   2  * Granch SBNI16 G.SHDSL Modem driver
   3  * Written by Denis I. Timofeev, 2002-2003.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/dev/sbsh/if_sbsh.c,v 1.3.2.1 2003/04/15 18:15:07 fjoe Exp $
  27  * $DragonFly: src/sys/dev/netif/sbsh/if_sbsh.c,v 1.7 2003/11/20 22:07:30 dillon Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/sockio.h>
  33 #include <sys/mbuf.h>
  34 #include <sys/malloc.h>
  35 #include <sys/kernel.h>
  36 #include <sys/proc.h>
  37 #include <sys/socket.h>
  38 #include <sys/random.h>
  39 #include <machine/clock.h>
  40 #include <machine/stdarg.h>
  41
  42 #include <net/if.h>
  43 #include <net/if_arp.h>
  44 #include <net/ethernet.h>
  45 #include <net/if_media.h>
  46
  47 #include <net/bpf.h>
  48
  49 #include <vm/vm.h>
  50 #include <vm/pmap.h>
  51 #include <machine/bus.h>
  52 #include <machine/resource.h>
  53 #include <sys/bus.h>
  54 #include <sys/rman.h>
  55
  56 #include <bus/pci/pcireg.h>
  57 #include <bus/pci/pcivar.h>
  58
  59 #include "if_sbshreg.h"
  60
  61 /* -------------------------------------------------------------------------- */
  62
  63 struct sbni16_hw_regs {
  64         u_int8_t  CR, CRB, SR, IMR, CTDR, LTDR, CRDR, LRDR;
  65 };
  66
  67 struct hw_descr {
  68         u_int32_t  address;
  69         u_int32_t  length;
  70 };
  71
  72 struct cx28975_cmdarea {
  73         u_int8_t  intr_host;
  74         u_int8_t  intr_8051;
  75         u_int8_t  map_version;
  76
  77         u_int8_t  in_dest;
  78         u_int8_t  in_opcode;
  79         u_int8_t  in_zero;
  80         u_int8_t  in_length;
  81         u_int8_t  in_csum;
  82         u_int8_t  in_data[75];
  83         u_int8_t  in_datasum;
  84
  85         u_int8_t  out_dest;
  86         u_int8_t  out_opcode;
  87         u_int8_t  out_ack;
  88         u_int8_t  out_length;
  89         u_int8_t  out_csum;
  90         u_int8_t  out_data[75];
  91         u_int8_t  out_datasum;
  92 };
  93
  94 #define XQLEN   8
  95 #define RQLEN   8
  96
  97 struct sbsh_softc {
  98         struct arpcom   arpcom;         /* ethernet common */
  99
 100         struct resource *mem_res;
 101         struct resource *irq_res;
 102         void            *intr_hand;
 103
 104         void            *mem_base;              /* mapped memory address */
 105
 106         volatile struct sbni16_hw_regs  *regs;
 107         volatile struct hw_descr        *tbd;
 108         volatile struct hw_descr        *rbd;
 109         volatile struct cx28975_cmdarea *cmdp;
 110
 111         /* SBNI16 controller statistics */
 112         struct sbni16_stats {
 113                 u_int32_t  sent_pkts, rcvd_pkts;
 114                 u_int32_t  crc_errs, ufl_errs, ofl_errs, attempts, last_time;
 115         } in_stats;
 116
 117         /* transmit and reception queues */
 118         struct mbuf     *xq[XQLEN], *rq[RQLEN];
 119         unsigned        head_xq, tail_xq, head_rq, tail_rq;
 120
 121         /* the descriptors mapped onto the first buffers in xq and rq */
 122         unsigned        head_tdesc, head_rdesc;
 123         u_int8_t        state;
 124 };
 125
 126 struct cx28975_cfg {
 127         u_int8_t   *firmw_image;
 128         u_int32_t  firmw_len;
 129         u_int32_t  lrate: 10;
 130         u_int32_t  master: 1;
 131         u_int32_t  mod: 2;
 132         u_int32_t  crc16: 1;
 133         u_int32_t  fill_7e: 1;
 134         u_int32_t  inv: 1;
 135         u_int32_t  rburst: 1;
 136         u_int32_t  wburst: 1;
 137         u_int32_t  : 14;
 138 };
 139
 140 /* SHDSL transceiver statistics */
 141 struct dsl_stats {
 142         u_int8_t        status_1, status_3;
 143         u_int8_t        attenuat, nmr, tpbo, rpbo;
 144         u_int16_t       losw, segd, crc, sega, losd;
 145 };
 146
 147 enum State { NOT_LOADED, DOWN, ACTIVATION, ACTIVE };
 148
 149 #define SIOCLOADFIRMW   _IOWR('i', 67, struct ifreq)
 150 #define SIOCGETSTATS    _IOWR('i', 68, struct ifreq)
 151 #define SIOCCLRSTATS    _IOWR('i', 69, struct ifreq)
 152
 153 static int      sbsh_probe(device_t);
 154 static int      sbsh_attach(device_t);
 155 static int      sbsh_detach(device_t);
 156 static int      sbsh_ioctl(struct ifnet *, u_long, caddr_t);
 157 static void     sbsh_shutdown(device_t);
 158 static int      sbsh_suspend(device_t);
 159 static int      sbsh_resume(device_t);
 160 static void     sbsh_watchdog(struct ifnet *);
 161
 162 static void     sbsh_start(struct ifnet *);
 163 static void     sbsh_init(void *);
 164 static void     sbsh_stop(struct sbsh_softc *);
 165 static void     init_card(struct sbsh_softc *);
 166 static void     sbsh_intr(void *);
 167 static void     resume_tx(struct sbsh_softc *);
 168 static void     start_xmit_frames(struct sbsh_softc *);
 169 static void     encap_frame(struct sbsh_softc *, struct mbuf *);
 170 static struct mbuf *    repack(struct sbsh_softc *, struct mbuf *);
 171 static void     free_sent_buffers(struct sbsh_softc *);
 172 static void     alloc_rx_buffers(struct sbsh_softc *);
 173 static void     indicate_frames(struct sbsh_softc *);
 174 static void     drop_queues(struct sbsh_softc *);
 175 static void     activate(struct sbsh_softc *);
 176 static void     deactivate(struct sbsh_softc *);
 177 static void     cx28975_interrupt(struct sbsh_softc *);
 178 static int      start_cx28975(struct sbsh_softc *, struct cx28975_cfg);
 179 static int      download_firmware(struct sbsh_softc *, u_int8_t *, u_int32_t);
 180 static int      issue_cx28975_cmd(struct sbsh_softc *, u_int8_t,
 181                                         u_int8_t *, u_int8_t);
 182
 183 static device_method_t sbsh_methods[] = {
 184         /* Device interface */
 185         DEVMETHOD(device_probe,         sbsh_probe),
 186         DEVMETHOD(device_attach,        sbsh_attach),
 187         DEVMETHOD(device_detach,        sbsh_detach),
 188         DEVMETHOD(device_shutdown,      sbsh_shutdown),
 189         DEVMETHOD(device_suspend,       sbsh_suspend),
 190         DEVMETHOD(device_resume,        sbsh_resume),
 191
 192         { 0, 0 }
 193 };
 194
 195 static driver_t sbsh_driver = {
 196         "sbsh",
 197         sbsh_methods,
 198         sizeof(struct sbsh_softc)
 199 };
 200
 201 static devclass_t sbsh_devclass;
 202
 203 DECLARE_DUMMY_MODULE(if_sbsh);
 204 DRIVER_MODULE(if_sbsh, pci, sbsh_driver, sbsh_devclass, 0, 0);
 205
 206 static int
 207 sbsh_probe(device_t dev)
 208 {
 209         if (pci_get_vendor(dev) != SBNI16_VENDOR
 210             || pci_get_device(dev) != SBNI16_DEVICE
 211             || pci_get_subdevice(dev) != SBNI16_SUBDEV)
 212                 return (ENXIO);
 213
 214         device_set_desc(dev, "Granch SBNI16 G.SHDSL Modem");
 215         return (0);
 216 }
 217
 218 static int
 219 sbsh_attach(device_t dev)
 220 {
 221         struct sbsh_softc       *sc;
 222         struct ifnet            *ifp;
 223         int                     unit, error = 0, rid, s;
 224
 225         s = splimp();
 226
 227         sc = device_get_softc(dev);
 228         unit = device_get_unit(dev);
 229
 230         rid = PCIR_MAPS + 4;
 231         sc->mem_res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
 232                                         0, ~0, 4096, RF_ACTIVE);
 233
 234         if (sc->mem_res == NULL) {
 235                 printf ("sbsh%d: couldn't map memory\n", unit);
 236                 error = ENXIO;
 237                 goto fail;
 238         }
 239
 240         rid = 0;
 241         sc->irq_res = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
 242                                                 RF_SHAREABLE | RF_ACTIVE);
 243
 244         if (sc->irq_res == NULL) {
 245                 printf("sbsh%d: couldn't map interrupt\n", unit);
 246                 bus_release_resource(dev, SYS_RES_MEMORY,
 247                                         PCIR_MAPS + 4, sc->mem_res);
 248                 error = ENXIO;
 249                 goto fail;
 250         }
 251
 252         sc->mem_base = rman_get_virtual(sc->mem_res);
 253         init_card(sc);
 254
 255         error = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_NET,
 256                                 sbsh_intr, sc, &sc->intr_hand);
 257         if (error) {
 258                 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
 259                 bus_release_resource(dev, SYS_RES_MEMORY,
 260                                         PCIR_MAPS + 4, sc->mem_res);
 261                 printf("sbsh%d: couldn't set up irq\n", unit);
 262                 goto fail;
 263         }
 264
 265         /* generate ethernet MAC address */
 266         *(u_int32_t *)sc->arpcom.ac_enaddr = htonl(0x00ff0192);
 267         read_random_unlimited(sc->arpcom.ac_enaddr + 4, 2);
 268
 269         ifp = &sc->arpcom.ac_if;
 270         ifp->if_softc = sc;
 271         ifp->if_unit = unit;
 272         ifp->if_name = "sbsh";
 273         ifp->if_mtu = ETHERMTU;
 274         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 275         ifp->if_ioctl = sbsh_ioctl;
 276         ifp->if_output = ether_output;
 277         ifp->if_start = sbsh_start;
 278         ifp->if_watchdog = sbsh_watchdog;
 279         ifp->if_init = sbsh_init;
 280         ifp->if_baudrate = 4600000;
 281         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 282
 283         ether_ifattach(ifp, ETHER_BPF_SUPPORTED);
 284
 285 fail:
 286         splx(s);
 287         return (error);
 288 }
 289
 290 static int
 291 sbsh_detach(device_t dev)
 292 {
 293         struct sbsh_softc       *sc;
 294         struct ifnet            *ifp;
 295         int                     s;
 296
 297         s = splimp();
 298
 299         sc = device_get_softc(dev);
 300         ifp = &sc->arpcom.ac_if;
 301
 302         sbsh_stop(sc);
 303         ether_ifdetach(ifp, ETHER_BPF_SUPPORTED);
 304
 305         bus_teardown_intr(dev, sc->irq_res, sc->intr_hand);
 306         bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
 307         bus_release_resource(dev, SYS_RES_MEMORY, PCIR_MAPS + 4, sc->mem_res);
 308
 309         splx(s);
 310         return (0);
 311 }
 312
 313
 314 static void
 315 sbsh_start(struct ifnet *ifp)
 316 {
 317         struct sbsh_softc  *sc = ifp->if_softc;
 318         int  s;
 319
 320         if (sc->state != ACTIVE)
 321                 return;
 322
 323         s = splimp();
 324         start_xmit_frames(ifp->if_softc);
 325         splx(s);
 326 }
 327
 328
 329 static void
 330 sbsh_init(void *xsc)
 331 {
 332         struct sbsh_softc       *sc = xsc;
 333         struct ifnet            *ifp = &sc->arpcom.ac_if;
 334         int                     s;
 335         u_int8_t                t;
 336
 337         if ((ifp->if_flags & IFF_RUNNING) || sc->state == NOT_LOADED)
 338                 return;
 339
 340         s = splimp();
 341
 342         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 343         sc->head_xq = sc->tail_xq = sc->head_rq = sc->tail_rq = 0;
 344         sc->head_tdesc = sc->head_rdesc = 0;
 345
 346         sc->regs->IMR = EXT;
 347         t = 2;
 348         issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1);
 349         if (issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1) == 0) {
 350                 sc->state = ACTIVATION;
 351
 352                 ifp->if_flags |= IFF_RUNNING;
 353                 ifp->if_flags &= ~IFF_OACTIVE;
 354         }
 355
 356         splx(s);
 357 }
 358
 359
 360 static void
 361 sbsh_stop(struct sbsh_softc *sc)
 362 {
 363         int  s;
 364         u_int8_t  t;
 365
 366         s = splimp();
 367         sc->regs->IMR = EXT;
 368
 369         t = 0;
 370         issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1);
 371         if (sc->state == ACTIVE) {
 372                 t = 1;
 373                 issue_cx28975_cmd(sc, _DSL_FORCE_DEACTIVATE, &t, 1);
 374                 /* FIX! activation manager state */
 375
 376                 /* Is it really must be done here? It calls from intr handler */
 377                 deactivate(sc);
 378         }
 379
 380         sc->regs->IMR = 0;
 381         sc->state = DOWN;
 382         splx(s);
 383 }
 384
 385
 386 static void
 387 init_card(struct sbsh_softc *sc)
 388 {
 389         sc->state = NOT_LOADED;
 390         sc->tbd  = (struct hw_descr *) sc->mem_base;
 391         sc->rbd  = (struct hw_descr *) ((u_int8_t *)sc->mem_base + 0x400);
 392         sc->regs = (struct sbni16_hw_regs *) ((u_int8_t *)sc->mem_base + 0x800);
 393         sc->cmdp = (struct cx28975_cmdarea *) ((u_int8_t *)sc->mem_base + 0xc00);
 394
 395         sc->regs->CR = 0;
 396         sc->regs->SR = 0xff;
 397         sc->regs->IMR = 0;
 398 }
 399
 400
 401 static int
 402 sbsh_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 403 {
 404         struct sbsh_softc       *sc = ifp->if_softc;
 405         struct ifreq            *ifr = (struct ifreq *) data;
 406         struct cx28975_cfg      cfg;
 407         struct dsl_stats        ds;
 408         struct thread           *td = curthread;
 409         int                     s, error = 0;
 410         u_int8_t                t;
 411
 412         s = splimp();
 413
 414         switch(cmd) {
 415         case SIOCLOADFIRMW:
 416                 if ((error = suser(td)) != 0)
 417                         break;
 418                 if (ifp->if_flags & IFF_UP)
 419                         error = EBUSY;
 420
 421                 bcopy((caddr_t)ifr->ifr_data, (caddr_t)&cfg, sizeof cfg);
 422                 if (start_cx28975(sc, cfg) == 0) {
 423                         static char  *modstr[] = {
 424                                 "TCPAM32", "TCPAM16", "TCPAM8", "TCPAM4" };
 425                         if_printf(&sc->arpcom.ac_if, "%s, rate %d, %s\n",
 426                                 cfg.master ? "master" : "slave",
 427                                 cfg.lrate << 3, modstr[cfg.mod]);
 428                 } else {
 429                         if_printf(&sc->arpcom.ac_if,
 430                                 "unable to load firmware\n");
 431                         error = EIO;
 432                 }
 433                 break;
 434
 435         case  SIOCGETSTATS :
 436                 if ((error = suser(td)) != 0)
 437                         break;
 438
 439                 t = 0;
 440                 if (issue_cx28975_cmd(sc, _DSL_FAR_END_ATTEN, &t, 1))
 441                         error = EIO;
 442                 ds.attenuat = sc->cmdp->out_data[0];
 443
 444                 if (issue_cx28975_cmd(sc, _DSL_NOISE_MARGIN, &t, 1))
 445                         error = EIO;
 446                 ds.nmr = sc->cmdp->out_data[0];
 447
 448                 if (issue_cx28975_cmd(sc, _DSL_POWER_BACK_OFF_RESULT, &t, 1))
 449                         error = EIO;
 450                 ds.tpbo = sc->cmdp->out_data[0];
 451                 ds.rpbo = sc->cmdp->out_data[1];
 452
 453                 if (!issue_cx28975_cmd(sc, _DSL_HDSL_PERF_ERR_CTRS, &t, 1)) {
 454                         int i;
 455                         for (i = 0; i < 10; ++i)
 456                                 ((u_int8_t *) &ds.losw)[i] =
 457                                         sc->cmdp->out_data[i];
 458                 } else
 459                         error = EIO;
 460
 461                 ds.status_1 = ((volatile u_int8_t *)sc->cmdp)[0x3c0];
 462                 ds.status_3 = ((volatile u_int8_t *)sc->cmdp)[0x3c2];
 463
 464                 bcopy(&sc->in_stats, ifr->ifr_data, sizeof(struct sbni16_stats));
 465                 bcopy(&ds, ifr->ifr_data + sizeof(struct sbni16_stats),
 466                     sizeof(struct dsl_stats));
 467                 break;
 468
 469         case  SIOCCLRSTATS :
 470                 if (!(error = suser(td))) {
 471                         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 472                         t = 2;
 473                         if (issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1))
 474                                 error = EIO;
 475                 }
 476                 break;
 477
 478         case SIOCSIFADDR:
 479         case SIOCGIFADDR:
 480         case SIOCSIFMTU:
 481                 error = ether_ioctl(ifp, cmd, data);
 482                 break;
 483
 484         case SIOCSIFFLAGS:
 485                 if (ifp->if_flags & IFF_UP) {
 486                         if (!(ifp->if_flags & IFF_RUNNING)) {
 487                                 if (sc->state == NOT_LOADED) {
 488                                         if_printf(ifp, "firmware wasn't loaded\n");
 489                                         error = EBUSY;
 490                                 } else
 491                                         sbsh_init(sc);
 492                         }
 493                 } else {
 494                         if (ifp->if_flags & IFF_RUNNING) {
 495                                 sbsh_stop(sc);
 496                                 ifp->if_flags &= ~IFF_RUNNING;
 497                         }
 498                 }
 499                 break;
 500
 501         case SIOCADDMULTI:
 502         case SIOCDELMULTI:
 503                 error = 0;
 504                 break;
 505
 506         default:
 507                 error = EINVAL;
 508                 break;
 509         }
 510
 511         splx(s);
 512         return (error);
 513 }
 514
 515
 516 static void
 517 sbsh_shutdown(device_t dev)
 518 {
 519         struct sbsh_softc       *sc = device_get_softc(dev);
 520
 521         sbsh_stop(sc);
 522 }
 523
 524 static int
 525 sbsh_suspend(device_t dev)
 526 {
 527         struct sbsh_softc       *sc = device_get_softc(dev);
 528         int                     s;
 529
 530         s = splimp();
 531         sbsh_stop(sc);
 532         splx(s);
 533
 534         return (0);
 535 }
 536
 537 static int
 538 sbsh_resume(device_t dev)
 539 {
 540         struct sbsh_softc       *sc = device_get_softc(dev);
 541         struct ifnet            *ifp;
 542         int                     s;
 543
 544         s = splimp();
 545         ifp = &sc->arpcom.ac_if;
 546
 547         if (ifp->if_flags & IFF_UP)
 548                 sbsh_init(sc);
 549
 550         splx(s);
 551         return (0);
 552 }
 553
 554
 555 static void
 556 sbsh_watchdog(struct ifnet *ifp)
 557 {
 558         struct sbsh_softc       *sc = ifp->if_softc;
 559
 560         if_printf(ifp, "transmit timeout\n");
 561
 562         if (sc->regs->SR & TXS) {
 563                 sc->regs->SR = TXS;
 564                 if_printf(ifp, "interrupt posted but not delivered\n");
 565         }
 566         free_sent_buffers(sc);
 567 }
 568
 569 /* -------------------------------------------------------------------------- */
 570
 571 static void
 572 sbsh_intr(void *arg)
 573 {
 574         struct sbsh_softc  *sc = (struct sbsh_softc *)arg;
 575         u_int8_t  status = sc->regs->SR;
 576
 577         if (status == 0)
 578                 return;
 579
 580         if (status & EXT) {
 581                 cx28975_interrupt(sc);
 582                 sc->regs->SR = EXT;
 583         }
 584
 585         if (status & UFL) {
 586                 resume_tx(sc);
 587                 sc->regs->SR = UFL;
 588                 ++sc->in_stats.ufl_errs;
 589                 ++sc->arpcom.ac_if.if_oerrors;
 590         }
 591
 592         if (status & RXS) {
 593                 sc->regs->SR = RXS;
 594                 indicate_frames(sc);
 595                 alloc_rx_buffers(sc);
 596         }
 597
 598         if (status & TXS) {
 599                 sc->regs->SR = TXS;
 600                 free_sent_buffers(sc);
 601         }
 602
 603         if (status & CRC) {
 604                 ++sc->in_stats.crc_errs;
 605                 ++sc->arpcom.ac_if.if_ierrors;
 606                 sc->regs->SR = CRC;
 607         }
 608
 609         if (status & OFL) {
 610                 ++sc->in_stats.ofl_errs;
 611                 ++sc->arpcom.ac_if.if_ierrors;
 612                 sc->regs->SR = OFL;
 613         }
 614 }
 615
 616 /*
 617  * Look for a first descriptor of a next packet, and write it's number
 618  * into CTDR. Then enable the transmitter.
 619  */
 620 static void
 621 resume_tx(struct sbsh_softc *sc)
 622 {
 623         u_int32_t       cur_tbd = sc->regs->CTDR;
 624
 625         while (cur_tbd != sc->regs->LTDR
 626                 && (sc->tbd[cur_tbd++].length & LAST_FRAG) == 0)
 627                 ;
 628         sc->regs->CTDR = cur_tbd;
 629         sc->regs->CR |= TXEN;
 630 }
 631
 632 static void
 633 start_xmit_frames(struct sbsh_softc *sc)
 634 {
 635         struct ifnet    *ifp = &sc->arpcom.ac_if;
 636         struct mbuf     *m;
 637
 638         /*
 639          * Check if we have any free descriptor(s) and free space in
 640          * our transmit queue.
 641          */
 642         while (sc->tail_xq != ((sc->head_xq - 1) & (XQLEN - 1))
 643             && sc->regs->LTDR != ((sc->head_tdesc - 1) & 0x7f)) {
 644
 645                 IF_DEQUEUE(&ifp->if_snd, m);
 646                 if (!m)
 647                         break;
 648                 if (m->m_pkthdr.len) {
 649                         if (ifp->if_bpf)
 650                                 bpf_mtap(ifp, m);
 651                         encap_frame(sc, m);
 652                 } else
 653                         m_freem(m);
 654         }
 655
 656         if (sc->regs->CTDR != sc->regs->LTDR)
 657                 ifp->if_flags |= IFF_OACTIVE;
 658         else
 659                 ifp->if_flags &= ~IFF_OACTIVE;
 660 }
 661
 662
 663 /*
 664  * MUST be called at splimp
 665  */
 666 static void
 667 encap_frame(struct sbsh_softc *sc, struct mbuf *m_head)
 668 {
 669         struct mbuf     *m;
 670         u_int32_t       cur_tbd;
 671         int  done;
 672
 673 look_for_nonzero:
 674         for (m = m_head; !m->m_len; m = m->m_next)
 675                 ;
 676
 677         cur_tbd = sc->regs->LTDR & 0x7f;
 678         done = 0;
 679         do {
 680                 if (m->m_len < 5 || cur_tbd == ((sc->head_tdesc - 1) & 0x7f)) {
 681                         if ((m_head = repack(sc, m_head)) != NULL)
 682                                 goto look_for_nonzero;
 683                         else
 684                                 return;
 685                 }
 686
 687                 sc->tbd[cur_tbd].address = vtophys(mtod(m, vm_offset_t));
 688                 sc->tbd[cur_tbd].length  = m->m_len;
 689
 690                 do {
 691                         m = m->m_next;
 692                 } while (m && !m->m_len);
 693
 694                 if (!m) {       /* last fragment has been reached */
 695                         sc->tbd[cur_tbd].length |= LAST_FRAG;
 696                         done = 1;
 697                 }
 698
 699                 ++cur_tbd;
 700                 cur_tbd &= 0x7f;
 701         } while (!done);
 702
 703         sc->xq[sc->tail_xq++] = m_head;
 704         sc->tail_xq &= (XQLEN - 1);
 705
 706         sc->regs->LTDR = cur_tbd;
 707         ++sc->in_stats.sent_pkts;
 708         ++sc->arpcom.ac_if.if_opackets;
 709 }
 710
 711 static struct mbuf *
 712 repack(struct sbsh_softc *sc, struct mbuf *m)
 713 {
 714         struct mbuf  *m_new;
 715
 716         MGETHDR(m_new, M_DONTWAIT, MT_DATA);
 717         if (!m_new) {
 718                 if_printf (&sc->arpcom.ac_if,
 719                            "unable to get mbuf.\n");
 720                 return (NULL);
 721         }
 722
 723         if (m->m_pkthdr.len > MHLEN) {
 724                 MCLGET(m_new, M_DONTWAIT);
 725                 if (!(m_new->m_flags & M_EXT)) {
 726                         m_freem(m_new);
 727                         if_printf (&sc->arpcom.ac_if,
 728                                    "unable to get mbuf cluster.\n");
 729                         return (NULL);
 730                 }
 731         }
 732
 733         m_copydata(m, 0, m->m_pkthdr.len, mtod(m_new, caddr_t));
 734         m_new->m_pkthdr.len = m_new->m_len = m->m_pkthdr.len;
 735         m_freem(m);
 736         return (m_new);
 737 }
 738
 739 static void
 740 free_sent_buffers(struct sbsh_softc *sc)
 741 {
 742         u_int32_t  cur_tbd;
 743
 744         cur_tbd = sc->regs->CTDR;
 745
 746         while (sc->head_tdesc != cur_tbd) {
 747                 /*
 748                  * Be careful! one element in xq may correspond to
 749                  * multiple descriptors.
 750                  */
 751                 if (sc->tbd[sc->head_tdesc].length & LAST_FRAG) {
 752                         m_freem(sc->xq[sc->head_xq++]);
 753                         sc->head_xq &= (XQLEN - 1);
 754                 }
 755
 756                 sc->tbd[sc->head_tdesc].length = 0;
 757                 sc->head_tdesc = (sc->head_tdesc + 1) & 0x7f;
 758         }
 759
 760         start_xmit_frames(sc);
 761 }
 762
 763 /*
 764  * DON'T use free_sent_buffers to drop the queue!
 765  */
 766 static void
 767 alloc_rx_buffers(struct sbsh_softc *sc)
 768 {
 769         unsigned        cur_rbd = sc->regs->LRDR & 0x7f;
 770         struct mbuf     *m;
 771
 772         while (sc->tail_rq != ((sc->head_rq - 1) & (RQLEN - 1))) {
 773                 MGETHDR(m, M_DONTWAIT, MT_DATA);
 774                 if (!m) {
 775                         if_printf (&sc->arpcom.ac_if,
 776                                    "unable to get mbuf.\n");
 777                         return;
 778                 }
 779
 780                 if (SBNI16_MAX_FRAME > MHLEN) {
 781                         MCLGET(m, M_DONTWAIT);
 782                         if (!(m->m_flags & M_EXT)) {
 783                                 m_freem(m);
 784                                 if_printf (&sc->arpcom.ac_if,
 785                                            "unable to get mbuf cluster.\n");
 786                                 return;
 787                         }
 788                         m->m_pkthdr.len = m->m_len = MCLBYTES;
 789                 }
 790
 791                 m_adj(m, 2);    /* align ip on longword boundaries */
 792
 793                 sc->rq[sc->tail_rq++] = m;
 794                 sc->tail_rq &= (RQLEN - 1);
 795
 796                 sc->rbd[cur_rbd].address = vtophys(mtod(m, vm_offset_t));
 797                 sc->rbd[cur_rbd].length  = 0;
 798                 sc->regs->LRDR = cur_rbd = (cur_rbd + 1) & 0x7f;
 799         }
 800 }
 801
 802 static void
 803 indicate_frames(struct sbsh_softc *sc)
 804 {
 805         struct ether_header *eh;
 806         unsigned  cur_rbd = sc->regs->CRDR & 0x7f;
 807
 808         while (sc->head_rdesc != cur_rbd) {
 809                 struct mbuf  *m = sc->rq[sc->head_rq++];
 810                 sc->head_rq &= (RQLEN - 1);
 811
 812                 m->m_pkthdr.len = m->m_len =
 813                                 sc->rbd[sc->head_rdesc].length & 0x7ff;
 814                 m->m_pkthdr.rcvif = &sc->arpcom.ac_if;
 815
 816                 eh = mtod(m, struct ether_header *);
 817                 m_adj(m, sizeof(struct ether_header));
 818                 ether_input(&sc->arpcom.ac_if, eh, m);
 819                 ++sc->in_stats.rcvd_pkts;
 820                 ++sc->arpcom.ac_if.if_ipackets;
 821
 822                 sc->head_rdesc = (sc->head_rdesc + 1) & 0x7f;
 823         }
 824 }
 825
 826 static void
 827 drop_queues(struct sbsh_softc *sc)
 828 {
 829         while (sc->head_rq != sc->tail_rq) {
 830                 m_freem(sc->rq[sc->head_rq++]);
 831                 sc->head_rq &= (RQLEN - 1);
 832         }
 833
 834         while (sc->head_xq != sc->tail_xq) {
 835                 m_freem(sc->xq[sc->head_xq++]);
 836                 sc->head_xq &= (XQLEN - 1);
 837         }
 838 }
 839
 840 /* -------------------------------------------------------------------------- */
 841
 842 static void
 843 activate(struct sbsh_softc *sc)
 844 {
 845         struct timeval  tv;
 846
 847         sc->regs->SR   = 0xff;          /* clear it! */
 848         sc->regs->CTDR = sc->regs->LTDR = sc->regs->CRDR = sc->regs->LRDR = 0;
 849
 850         sc->head_tdesc = sc->head_rdesc = 0;
 851         alloc_rx_buffers(sc);
 852
 853         sc->regs->CRB &= ~RXDE;
 854         sc->regs->IMR = EXT | RXS | TXS | CRC | OFL | UFL;
 855         sc->regs->CR |= TXEN | RXEN;
 856
 857         sc->state = ACTIVE;
 858         ++sc->in_stats.attempts;
 859         microtime(&tv);
 860         sc->in_stats.last_time = tv.tv_sec;
 861         start_xmit_frames(sc);
 862 }
 863
 864 static void
 865 deactivate(struct sbsh_softc *sc)
 866 {
 867         sc->regs->CR &= ~(RXEN | TXEN);
 868         sc->regs->CRB |= RXDE;
 869         sc->regs->IMR  = EXT;
 870         sc->regs->CTDR = sc->regs->LTDR;
 871         sc->regs->CRDR = sc->regs->LRDR;
 872         sc->state = ACTIVATION;
 873
 874         drop_queues(sc);
 875 }
 876
 877 /* -------------------------------------------------------------------------- */
 878
 879 static void
 880 cx28975_interrupt(struct sbsh_softc *sc)
 881 {
 882         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 883         u_int8_t  t;
 884
 885         if (p->intr_host != 0xfe)
 886                 return;
 887
 888         if (p->out_ack & 0x80) {
 889                 if (*((volatile u_int8_t *)p + 0x3c7) & 2) {
 890                         if (sc->state != ACTIVE
 891                             && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) == 0x40) {
 892                                 activate(sc);
 893                                 if_printf(&sc->arpcom.ac_if, "connected to peer\n");
 894                         } else if (sc->state == ACTIVE
 895                                  && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) != 0x40) {
 896                                 deactivate(sc);
 897                                 if_printf(&sc->arpcom.ac_if, "carrier lost\n");
 898                         }
 899                 }
 900
 901                 p->intr_host = 0;
 902                 t = p->intr_host;
 903                 p->out_ack = 0;
 904         } else {
 905                 wakeup(sc);
 906
 907                 p->intr_host = 0;
 908                 t = p->intr_host;
 909         }
 910 }
 911
 912 /* -------------------------------------------------------------------------- */
 913
 914 static int
 915 start_cx28975(struct sbsh_softc *sc, struct cx28975_cfg cfg)
 916 {
 917         static char  thresh[] = { +8, -4, -16, -40 };
 918
 919         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 920         u_int8_t  t, parm[12];
 921
 922         p->intr_host = 0;
 923         t = p->intr_host;
 924
 925         /* reset chip set */
 926         sc->regs->IMR = EXT;
 927         sc->regs->CR  = 0;
 928         sc->regs->SR  = 0xff;
 929         DELAY(2);
 930         sc->regs->CR = XRST;
 931         if (cfg.crc16)
 932                 sc->regs->CR |= CMOD;
 933         if (cfg.fill_7e)
 934                 sc->regs->CR |= FMOD;
 935         if (cfg.inv)
 936                 sc->regs->CR |= PMOD;
 937
 938         sc->regs->CRB |= RODD | RXDE;
 939         if (cfg.rburst)
 940                 sc->regs->CRB |= RDBE;
 941         if (cfg.wburst)
 942                 sc->regs->CRB |= WTBE;
 943
 944         tsleep(sc, 0, "sbsh", 0);
 945         if ((p->out_ack & 0x1f) != _ACK_BOOT_WAKE_UP)
 946                 return (-1);
 947
 948         if (download_firmware(sc, cfg.firmw_image, cfg.firmw_len))
 949                 return (-1);
 950
 951         tsleep(sc, 0, "sbsh", 0);
 952         if ((p->out_ack & 0x1f) != _ACK_OPER_WAKE_UP)
 953                 return (-1);
 954
 955         t = cfg.master ? 1 : 9;
 956         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_ENABLE, &t, 1))
 957                 return (-1);
 958
 959         t = 0x63;
 960         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_CONFIG, &t, 1))
 961                 return (-1);
 962
 963         *(u_int16_t *)parm = cfg.lrate >> 3;
 964         parm[2] = parm[3] = parm[0];
 965         parm[5] = cfg.lrate & 7;
 966         parm[4] = parm[7] = 1;
 967         parm[6] = 0;
 968         if (issue_cx28975_cmd(sc, _DSL_MULTI_RATE_CONFIG, parm, 8))
 969                 return (-1);
 970
 971         parm[0] = 0x02 | (cfg.mod << 4);
 972         parm[1] = 0;
 973         if (issue_cx28975_cmd(sc, _DSL_TRAINING_MODE, parm, 2))
 974                 return (-1);
 975
 976         bzero(parm, 12);
 977         parm[0] = 0x04;         /* pre-activation: G.hs */
 978         parm[4] = 0x04;         /* no remote configuration */
 979         parm[7] = 0x01;         /* annex A (default) */
 980         parm[8] = 0xff;         /* i-bit mask (all bits) */
 981         if (issue_cx28975_cmd(sc, _DSL_PREACTIVATION_CFG, parm, 12))
 982                 return (-1);
 983
 984         parm[0] = 0x03;         /* dying gasp time - 3 frames */
 985         parm[1] = thresh[cfg.mod];
 986         parm[2] = 0xff;         /* attenuation */
 987         parm[3] = 0x04;         /* line probe NMR (+2 dB) */
 988         parm[4] = 0x00;         /* reserved */
 989         parm[5] = 0x00;
 990         if (issue_cx28975_cmd(sc, _DSL_THRESHOLDS, parm, 6))
 991                 return (-1);
 992
 993         t = cfg.master ? 0x23 : 0x21;
 994         if (issue_cx28975_cmd(sc, _DSL_FR_PCM_CONFIG, &t, 1))
 995                 return (-1);
 996
 997         t = 0x02;
 998         if (issue_cx28975_cmd(sc, _DSL_INTR_HOST_MASK, &t, 1))
 999                 return (-1);
1000
1001         sc->state = DOWN;
1002         return (0);
1003 }
1004
1005 static int
1006 download_firmware(struct sbsh_softc *sc, u_int8_t *img, u_int32_t img_len)
1007 {
1008         u_int32_t       t;
1009         int             i;
1010         u_int8_t        cksum = 0;
1011
1012         for (i = 0; i < img_len; ++i)
1013                 cksum += img[i];
1014
1015         t = img_len;
1016         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_START, (u_int8_t *) &t, 4))
1017                 return (-1);
1018
1019         for (i = 0; img_len >= 75; i += 75, img_len -= 75) {
1020                 if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, 75))
1021                         return (-1);
1022         }
1023
1024         if (img_len
1025             &&  issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, img_len))
1026                 return (-1);
1027
1028         t = (cksum ^ 0xff) + 1;
1029         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_END, (u_int8_t *) &t, 1))
1030                 return (-1);
1031
1032         return (0);
1033 }
1034
1035 static int
1036 issue_cx28975_cmd(struct sbsh_softc *sc, u_int8_t cmd,
1037                         u_int8_t *data, u_int8_t size)
1038 {
1039         volatile struct cx28975_cmdarea  *p = sc->cmdp;
1040         u_int8_t  *databuf = p->in_data;
1041         int  i;
1042
1043         u_int8_t  cksum = 0;
1044
1045         p->in_dest      = 0xf0;
1046         p->in_opcode    = cmd;
1047         p->in_zero      = 0;
1048         p->in_length    = --size;
1049         p->in_csum      = 0xf0 ^ cmd ^ size ^ 0xaa;
1050
1051         for (i = 0; i <= size; ++i) {
1052                 cksum ^= *data;
1053                 *databuf++ = *data++;   /* only 1 byte per cycle! */
1054         }
1055
1056         p->in_datasum   = cksum ^ 0xaa;
1057         p->out_ack      = _ACK_NOT_COMPLETE;
1058         p->intr_8051    = 0xfe;
1059
1060         if (tsleep(sc, 0, "sbsh", hz << 3))
1061                 return (-1);
1062
1063         while (p->out_ack == _ACK_NOT_COMPLETE)
1064                 ;                                       /* FIXME ! */
1065
1066         if ((p->out_ack & 0x1f) == _ACK_PASS) {
1067                 p->out_ack = 0;
1068                 return (0);
1069         } else {
1070                 p->out_ack = 0;
1071                 return (-1);
1072         }
1073 }