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  */
  28
  29 #include <sys/param.h>
  30 #include <sys/systm.h>
  31 #include <sys/sockio.h>
  32 #include <sys/mbuf.h>
  33 #include <sys/malloc.h>
  34 #include <sys/kernel.h>
  35 #include <sys/proc.h>
  36 #include <sys/priv.h>
  37 #include <sys/socket.h>
  38 #include <sys/random.h>
  39 #include <sys/serialize.h>
  40 #include <sys/bus.h>
  41 #include <sys/rman.h>
  42 #include <sys/thread2.h>
  43 #include <sys/interrupt.h>
  44
  45 #include <net/if.h>
  46 #include <net/ifq_var.h>
  47 #include <net/if_arp.h>
  48 #include <net/ethernet.h>
  49 #include <net/if_media.h>
  50
  51 #include <net/bpf.h>
  52
  53 #include <vm/vm.h>
  54 #include <vm/pmap.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, struct ucred *);
 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, NULL, NULL);
 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;
 224
 225         sc = device_get_softc(dev);
 226         unit = device_get_unit(dev);
 227
 228         rid = PCIR_MAPS + 4;
 229         sc->mem_res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
 230                                         0, ~0, 4096, RF_ACTIVE);
 231
 232         if (sc->mem_res == NULL) {
 233                 kprintf ("sbsh%d: couldn't map memory\n", unit);
 234                 error = ENXIO;
 235                 goto fail;
 236         }
 237
 238         rid = 0;
 239         sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
 240             RF_SHAREABLE | RF_ACTIVE);
 241
 242         if (sc->irq_res == NULL) {
 243                 kprintf("sbsh%d: couldn't map interrupt\n", unit);
 244                 error = ENXIO;
 245                 goto fail;
 246         }
 247
 248         sc->mem_base = rman_get_virtual(sc->mem_res);
 249         init_card(sc);
 250         /* generate ethernet MAC address */
 251         *(u_int32_t *)sc->arpcom.ac_enaddr = htonl(0x00ff0192);
 252         read_random_unlimited(sc->arpcom.ac_enaddr + 4, 2);
 253
 254         ifp = &sc->arpcom.ac_if;
 255         ifp->if_softc = sc;
 256         if_initname(ifp, "sbsh", unit);
 257         ifp->if_mtu = ETHERMTU;
 258         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 259         ifp->if_ioctl = sbsh_ioctl;
 260         ifp->if_start = sbsh_start;
 261         ifp->if_watchdog = sbsh_watchdog;
 262         ifp->if_init = sbsh_init;
 263         ifp->if_baudrate = 4600000;
 264         ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
 265         ifq_set_ready(&ifp->if_snd);
 266
 267         ether_ifattach(ifp, sc->arpcom.ac_enaddr, NULL);
 268
 269         error = bus_setup_intr(dev, sc->irq_res, INTR_MPSAFE,
 270                                 sbsh_intr, sc, &sc->intr_hand,
 271                                 ifp->if_serializer);
 272         if (error) {
 273                 ether_ifdetach(ifp);
 274                 kprintf("sbsh%d: couldn't set up irq\n", unit);
 275                 goto fail;
 276         }
 277
 278         ifq_set_cpuid(&ifp->if_snd, rman_get_cpuid(sc->irq_res));
 279
 280         return(0);
 281
 282 fail:
 283         sbsh_detach(dev);
 284         return (error);
 285 }
 286
 287 static int
 288 sbsh_detach(device_t dev)
 289 {
 290         struct sbsh_softc *sc = device_get_softc(dev);
 291         struct ifnet *ifp = &sc->arpcom.ac_if;
 292
 293         if (device_is_attached(dev)) {
 294                 lwkt_serialize_enter(ifp->if_serializer);
 295                 sbsh_stop(sc);
 296                 bus_teardown_intr(dev, sc->irq_res, sc->intr_hand);
 297                 lwkt_serialize_exit(ifp->if_serializer);
 298
 299                 ether_ifdetach(ifp);
 300         }
 301
 302         if (sc->irq_res)
 303                 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
 304         if (sc->mem_res) {
 305                 bus_release_resource(dev, SYS_RES_MEMORY, PCIR_MAPS + 4,
 306                                      sc->mem_res);
 307         }
 308
 309         return (0);
 310 }
 311
 312
 313 static void
 314 sbsh_start(struct ifnet *ifp)
 315 {
 316         struct sbsh_softc  *sc = ifp->if_softc;
 317
 318         if (sc->state == ACTIVE)
 319                 start_xmit_frames(ifp->if_softc);
 320 }
 321
 322
 323 static void
 324 sbsh_init(void *xsc)
 325 {
 326         struct sbsh_softc       *sc = xsc;
 327         struct ifnet            *ifp = &sc->arpcom.ac_if;
 328         u_int8_t                t;
 329
 330         if ((ifp->if_flags & IFF_RUNNING) || sc->state == NOT_LOADED) {
 331                 return;
 332         }
 333
 334         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 335         sc->head_xq = sc->tail_xq = sc->head_rq = sc->tail_rq = 0;
 336         sc->head_tdesc = sc->head_rdesc = 0;
 337
 338         sc->regs->IMR = EXT;
 339         t = 2;
 340         issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1);
 341         if (issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1) == 0) {
 342                 sc->state = ACTIVATION;
 343
 344                 ifp->if_flags |= IFF_RUNNING;
 345                 ifq_clr_oactive(&ifp->if_snd);
 346         }
 347 }
 348
 349
 350 static void
 351 sbsh_stop(struct sbsh_softc *sc)
 352 {
 353         u_int8_t  t;
 354
 355         sc->regs->IMR = EXT;
 356
 357         t = 0;
 358         issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1);
 359         if (sc->state == ACTIVE) {
 360                 t = 1;
 361                 issue_cx28975_cmd(sc, _DSL_FORCE_DEACTIVATE, &t, 1);
 362                 /* FIX! activation manager state */
 363
 364                 /* Is it really must be done here? It calls from intr handler */
 365                 deactivate(sc);
 366         }
 367
 368         sc->regs->IMR = 0;
 369         sc->state = DOWN;
 370 }
 371
 372
 373 static void
 374 init_card(struct sbsh_softc *sc)
 375 {
 376         sc->state = NOT_LOADED;
 377         sc->tbd  = (struct hw_descr *) sc->mem_base;
 378         sc->rbd  = (struct hw_descr *) ((u_int8_t *)sc->mem_base + 0x400);
 379         sc->regs = (struct sbni16_hw_regs *) ((u_int8_t *)sc->mem_base + 0x800);
 380         sc->cmdp = (struct cx28975_cmdarea *) ((u_int8_t *)sc->mem_base + 0xc00);
 381
 382         sc->regs->CR = 0;
 383         sc->regs->SR = 0xff;
 384         sc->regs->IMR = 0;
 385 }
 386
 387
 388 static int
 389 sbsh_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 390 {
 391         struct sbsh_softc       *sc = ifp->if_softc;
 392         struct ifreq            *ifr = (struct ifreq *) data;
 393         struct cx28975_cfg      cfg;
 394         struct dsl_stats        ds;
 395         int                     error = 0;
 396         u_int8_t                t;
 397
 398         switch(cmd) {
 399         case SIOCLOADFIRMW:
 400                 if ((error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY)) != 0)
 401                         break;
 402                 if (ifp->if_flags & IFF_UP)
 403                         error = EBUSY;
 404
 405                 bcopy((caddr_t)ifr->ifr_data, (caddr_t)&cfg, sizeof cfg);
 406                 if (start_cx28975(sc, cfg) == 0) {
 407                         static char  *modstr[] = {
 408                                 "TCPAM32", "TCPAM16", "TCPAM8", "TCPAM4" };
 409                         if_printf(&sc->arpcom.ac_if, "%s, rate %d, %s\n",
 410                                 cfg.master ? "master" : "slave",
 411                                 cfg.lrate << 3, modstr[cfg.mod]);
 412                 } else {
 413                         if_printf(&sc->arpcom.ac_if,
 414                                 "unable to load firmware\n");
 415                         error = EIO;
 416                 }
 417                 break;
 418
 419         case  SIOCGETSTATS :
 420                 if ((error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY)) != 0)
 421                         break;
 422
 423                 t = 0;
 424                 if (issue_cx28975_cmd(sc, _DSL_FAR_END_ATTEN, &t, 1))
 425                         error = EIO;
 426                 ds.attenuat = sc->cmdp->out_data[0];
 427
 428                 if (issue_cx28975_cmd(sc, _DSL_NOISE_MARGIN, &t, 1))
 429                         error = EIO;
 430                 ds.nmr = sc->cmdp->out_data[0];
 431
 432                 if (issue_cx28975_cmd(sc, _DSL_POWER_BACK_OFF_RESULT, &t, 1))
 433                         error = EIO;
 434                 ds.tpbo = sc->cmdp->out_data[0];
 435                 ds.rpbo = sc->cmdp->out_data[1];
 436
 437                 if (!issue_cx28975_cmd(sc, _DSL_HDSL_PERF_ERR_CTRS, &t, 1)) {
 438                         int i;
 439                         for (i = 0; i < 10; ++i)
 440                                 ((u_int8_t *) &ds.losw)[i] =
 441                                         sc->cmdp->out_data[i];
 442                 } else
 443                         error = EIO;
 444
 445                 ds.status_1 = ((volatile u_int8_t *)sc->cmdp)[0x3c0];
 446                 ds.status_3 = ((volatile u_int8_t *)sc->cmdp)[0x3c2];
 447
 448                 bcopy(&sc->in_stats, ifr->ifr_data, sizeof(struct sbni16_stats));
 449                 bcopy(&ds, (char *)ifr->ifr_data + sizeof(struct sbni16_stats),
 450                     sizeof(struct dsl_stats));
 451                 break;
 452
 453         case  SIOCCLRSTATS :
 454                 if (!(error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY))) {
 455                         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 456                         t = 2;
 457                         if (issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1))
 458                                 error = EIO;
 459                 }
 460                 break;
 461         case SIOCSIFFLAGS:
 462                 if (ifp->if_flags & IFF_UP) {
 463                         if (!(ifp->if_flags & IFF_RUNNING)) {
 464                                 if (sc->state == NOT_LOADED) {
 465                                         if_printf(ifp, "firmware wasn't loaded\n");
 466                                         error = EBUSY;
 467                                 } else
 468                                         sbsh_init(sc);
 469                         }
 470                 } else {
 471                         if (ifp->if_flags & IFF_RUNNING) {
 472                                 sbsh_stop(sc);
 473                                 ifp->if_flags &= ~IFF_RUNNING;
 474                         }
 475                 }
 476                 break;
 477
 478         case SIOCADDMULTI:
 479         case SIOCDELMULTI:
 480                 error = 0;
 481                 break;
 482         default:
 483                 error = ether_ioctl(ifp, cmd, data);
 484                 break;
 485         }
 486         return (error);
 487 }
 488
 489
 490 static void
 491 sbsh_shutdown(device_t dev)
 492 {
 493         struct sbsh_softc       *sc = device_get_softc(dev);
 494
 495         lwkt_serialize_enter(sc->arpcom.ac_if.if_serializer);
 496         sbsh_stop(sc);
 497         lwkt_serialize_exit(sc->arpcom.ac_if.if_serializer);
 498 }
 499
 500 static int
 501 sbsh_suspend(device_t dev)
 502 {
 503         struct sbsh_softc *sc = device_get_softc(dev);
 504
 505         lwkt_serialize_enter(sc->arpcom.ac_if.if_serializer);
 506         sbsh_stop(sc);
 507         lwkt_serialize_exit(sc->arpcom.ac_if.if_serializer);
 508
 509         return (0);
 510 }
 511
 512 static int
 513 sbsh_resume(device_t dev)
 514 {
 515         struct sbsh_softc *sc = device_get_softc(dev);
 516         struct ifnet *ifp = &sc->arpcom.ac_if;
 517
 518         if (ifp->if_flags & IFF_UP)
 519                 sbsh_init(sc);
 520
 521         return (0);
 522 }
 523
 524
 525 static void
 526 sbsh_watchdog(struct ifnet *ifp)
 527 {
 528         struct sbsh_softc       *sc = ifp->if_softc;
 529
 530         if_printf(ifp, "transmit timeout\n");
 531
 532         if (sc->regs->SR & TXS) {
 533                 sc->regs->SR = TXS;
 534                 if_printf(ifp, "interrupt posted but not delivered\n");
 535         }
 536         free_sent_buffers(sc);
 537 }
 538
 539 /* -------------------------------------------------------------------------- */
 540
 541 static void
 542 sbsh_intr(void *arg)
 543 {
 544         struct sbsh_softc  *sc = (struct sbsh_softc *)arg;
 545         u_int8_t  status = sc->regs->SR;
 546
 547         if (status == 0)
 548                 return;
 549
 550         if (status & EXT) {
 551                 cx28975_interrupt(sc);
 552                 sc->regs->SR = EXT;
 553         }
 554
 555         if (status & UFL) {
 556                 resume_tx(sc);
 557                 sc->regs->SR = UFL;
 558                 ++sc->in_stats.ufl_errs;
 559                 ++sc->arpcom.ac_if.if_oerrors;
 560         }
 561
 562         if (status & RXS) {
 563                 sc->regs->SR = RXS;
 564                 indicate_frames(sc);
 565                 alloc_rx_buffers(sc);
 566         }
 567
 568         if (status & TXS) {
 569                 sc->regs->SR = TXS;
 570                 free_sent_buffers(sc);
 571         }
 572
 573         if (status & CRC) {
 574                 ++sc->in_stats.crc_errs;
 575                 ++sc->arpcom.ac_if.if_ierrors;
 576                 sc->regs->SR = CRC;
 577         }
 578
 579         if (status & OFL) {
 580                 ++sc->in_stats.ofl_errs;
 581                 ++sc->arpcom.ac_if.if_ierrors;
 582                 sc->regs->SR = OFL;
 583         }
 584 }
 585
 586 /*
 587  * Look for a first descriptor of a next packet, and write it's number
 588  * into CTDR. Then enable the transmitter.
 589  */
 590 static void
 591 resume_tx(struct sbsh_softc *sc)
 592 {
 593         u_int32_t       cur_tbd = sc->regs->CTDR;
 594
 595         while (cur_tbd != sc->regs->LTDR
 596                 && (sc->tbd[cur_tbd++].length & LAST_FRAG) == 0)
 597                 ;
 598         sc->regs->CTDR = cur_tbd;
 599         sc->regs->CR |= TXEN;
 600 }
 601
 602 static void
 603 start_xmit_frames(struct sbsh_softc *sc)
 604 {
 605         struct ifnet    *ifp = &sc->arpcom.ac_if;
 606         struct mbuf     *m;
 607
 608         /*
 609          * Check if we have any free descriptor(s) and free space in
 610          * our transmit queue.
 611          */
 612         while (sc->tail_xq != ((sc->head_xq - 1) & (XQLEN - 1))
 613             && sc->regs->LTDR != ((sc->head_tdesc - 1) & 0x7f)) {
 614
 615                 m = ifq_dequeue(&ifp->if_snd, NULL);
 616                 if (m == NULL)
 617                         break;
 618                 if (m->m_pkthdr.len) {
 619                         BPF_MTAP(ifp, m);
 620                         encap_frame(sc, m);
 621                 } else
 622                         m_freem(m);
 623         }
 624
 625         if (sc->regs->CTDR != sc->regs->LTDR)
 626                 ifq_set_oactive(&ifp->if_snd);
 627         else
 628                 ifq_clr_oactive(&ifp->if_snd);
 629 }
 630
 631
 632 static void
 633 encap_frame(struct sbsh_softc *sc, struct mbuf *m_head)
 634 {
 635         struct mbuf     *m;
 636         u_int32_t       cur_tbd;
 637         int  done;
 638
 639 look_for_nonzero:
 640         for (m = m_head; !m->m_len; m = m->m_next)
 641                 ;
 642
 643         cur_tbd = sc->regs->LTDR & 0x7f;
 644         done = 0;
 645         do {
 646                 if (m->m_len < 5 || cur_tbd == ((sc->head_tdesc - 1) & 0x7f)) {
 647                         if ((m_head = repack(sc, m_head)) != NULL)
 648                                 goto look_for_nonzero;
 649                         else
 650                                 return;
 651                 }
 652
 653                 sc->tbd[cur_tbd].address = vtophys(mtod(m, vm_offset_t));
 654                 sc->tbd[cur_tbd].length  = m->m_len;
 655
 656                 do {
 657                         m = m->m_next;
 658                 } while (m && !m->m_len);
 659
 660                 if (!m) {       /* last fragment has been reached */
 661                         sc->tbd[cur_tbd].length |= LAST_FRAG;
 662                         done = 1;
 663                 }
 664
 665                 ++cur_tbd;
 666                 cur_tbd &= 0x7f;
 667         } while (!done);
 668
 669         sc->xq[sc->tail_xq++] = m_head;
 670         sc->tail_xq &= (XQLEN - 1);
 671
 672         sc->regs->LTDR = cur_tbd;
 673         ++sc->in_stats.sent_pkts;
 674         ++sc->arpcom.ac_if.if_opackets;
 675 }
 676
 677 static struct mbuf *
 678 repack(struct sbsh_softc *sc, struct mbuf *m)
 679 {
 680         struct mbuf  *m_new;
 681
 682         MGETHDR(m_new, MB_DONTWAIT, MT_DATA);
 683         if (!m_new) {
 684                 if_printf (&sc->arpcom.ac_if,
 685                            "unable to get mbuf.\n");
 686                 return (NULL);
 687         }
 688
 689         if (m->m_pkthdr.len > MHLEN) {
 690                 MCLGET(m_new, MB_DONTWAIT);
 691                 if (!(m_new->m_flags & M_EXT)) {
 692                         m_freem(m_new);
 693                         if_printf (&sc->arpcom.ac_if,
 694                                    "unable to get mbuf cluster.\n");
 695                         return (NULL);
 696                 }
 697         }
 698
 699         m_copydata(m, 0, m->m_pkthdr.len, mtod(m_new, caddr_t));
 700         m_new->m_pkthdr.len = m_new->m_len = m->m_pkthdr.len;
 701         m_freem(m);
 702         return (m_new);
 703 }
 704
 705 static void
 706 free_sent_buffers(struct sbsh_softc *sc)
 707 {
 708         u_int32_t  cur_tbd;
 709
 710         cur_tbd = sc->regs->CTDR;
 711
 712         while (sc->head_tdesc != cur_tbd) {
 713                 /*
 714                  * Be careful! one element in xq may correspond to
 715                  * multiple descriptors.
 716                  */
 717                 if (sc->tbd[sc->head_tdesc].length & LAST_FRAG) {
 718                         m_freem(sc->xq[sc->head_xq++]);
 719                         sc->head_xq &= (XQLEN - 1);
 720                 }
 721
 722                 sc->tbd[sc->head_tdesc].length = 0;
 723                 sc->head_tdesc = (sc->head_tdesc + 1) & 0x7f;
 724         }
 725
 726         start_xmit_frames(sc);
 727 }
 728
 729 /*
 730  * DON'T use free_sent_buffers to drop the queue!
 731  */
 732 static void
 733 alloc_rx_buffers(struct sbsh_softc *sc)
 734 {
 735         unsigned        cur_rbd = sc->regs->LRDR & 0x7f;
 736         struct mbuf     *m;
 737
 738         while (sc->tail_rq != ((sc->head_rq - 1) & (RQLEN - 1))) {
 739                 MGETHDR(m, MB_DONTWAIT, MT_DATA);
 740                 if (!m) {
 741                         if_printf (&sc->arpcom.ac_if,
 742                                    "unable to get mbuf.\n");
 743                         return;
 744                 }
 745
 746                 if (SBNI16_MAX_FRAME > MHLEN) {
 747                         MCLGET(m, MB_DONTWAIT);
 748                         if (!(m->m_flags & M_EXT)) {
 749                                 m_freem(m);
 750                                 if_printf (&sc->arpcom.ac_if,
 751                                            "unable to get mbuf cluster.\n");
 752                                 return;
 753                         }
 754                         m->m_pkthdr.len = m->m_len = MCLBYTES;
 755                 }
 756
 757                 m_adj(m, 2);    /* align ip on longword boundaries */
 758
 759                 sc->rq[sc->tail_rq++] = m;
 760                 sc->tail_rq &= (RQLEN - 1);
 761
 762                 sc->rbd[cur_rbd].address = vtophys(mtod(m, vm_offset_t));
 763                 sc->rbd[cur_rbd].length  = 0;
 764                 sc->regs->LRDR = cur_rbd = (cur_rbd + 1) & 0x7f;
 765         }
 766 }
 767
 768 static void
 769 indicate_frames(struct sbsh_softc *sc)
 770 {
 771         struct ifnet *ifp = &sc->arpcom.ac_if;
 772         unsigned  cur_rbd = sc->regs->CRDR & 0x7f;
 773
 774         while (sc->head_rdesc != cur_rbd) {
 775                 struct mbuf  *m = sc->rq[sc->head_rq++];
 776                 sc->head_rq &= (RQLEN - 1);
 777
 778                 m->m_pkthdr.len = m->m_len =
 779                                 sc->rbd[sc->head_rdesc].length & 0x7ff;
 780                 m->m_pkthdr.rcvif = ifp;
 781
 782                 ifp->if_input(ifp, m);
 783                 ++sc->in_stats.rcvd_pkts;
 784                 ++ifp->if_ipackets;
 785
 786                 sc->head_rdesc = (sc->head_rdesc + 1) & 0x7f;
 787         }
 788 }
 789
 790 static void
 791 drop_queues(struct sbsh_softc *sc)
 792 {
 793         while (sc->head_rq != sc->tail_rq) {
 794                 m_freem(sc->rq[sc->head_rq++]);
 795                 sc->head_rq &= (RQLEN - 1);
 796         }
 797
 798         while (sc->head_xq != sc->tail_xq) {
 799                 m_freem(sc->xq[sc->head_xq++]);
 800                 sc->head_xq &= (XQLEN - 1);
 801         }
 802 }
 803
 804 /* -------------------------------------------------------------------------- */
 805
 806 static void
 807 activate(struct sbsh_softc *sc)
 808 {
 809         struct timeval  tv;
 810
 811         sc->regs->SR   = 0xff;          /* clear it! */
 812         sc->regs->CTDR = sc->regs->LTDR = sc->regs->CRDR = sc->regs->LRDR = 0;
 813
 814         sc->head_tdesc = sc->head_rdesc = 0;
 815         alloc_rx_buffers(sc);
 816
 817         sc->regs->CRB &= ~RXDE;
 818         sc->regs->IMR = EXT | RXS | TXS | CRC | OFL | UFL;
 819         sc->regs->CR |= TXEN | RXEN;
 820
 821         sc->state = ACTIVE;
 822         ++sc->in_stats.attempts;
 823         microtime(&tv);
 824         sc->in_stats.last_time = tv.tv_sec;
 825         start_xmit_frames(sc);
 826 }
 827
 828 static void
 829 deactivate(struct sbsh_softc *sc)
 830 {
 831         sc->regs->CR &= ~(RXEN | TXEN);
 832         sc->regs->CRB |= RXDE;
 833         sc->regs->IMR  = EXT;
 834         sc->regs->CTDR = sc->regs->LTDR;
 835         sc->regs->CRDR = sc->regs->LRDR;
 836         sc->state = ACTIVATION;
 837
 838         drop_queues(sc);
 839 }
 840
 841 /* -------------------------------------------------------------------------- */
 842
 843 static void
 844 cx28975_interrupt(struct sbsh_softc *sc)
 845 {
 846         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 847
 848         if (p->intr_host != 0xfe)
 849                 return;
 850
 851         if (p->out_ack & 0x80) {
 852                 if (*((volatile u_int8_t *)p + 0x3c7) & 2) {
 853                         if (sc->state != ACTIVE
 854                             && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) == 0x40) {
 855                                 activate(sc);
 856                                 if_printf(&sc->arpcom.ac_if, "connected to peer\n");
 857                         } else if (sc->state == ACTIVE
 858                                  && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) != 0x40) {
 859                                 deactivate(sc);
 860                                 if_printf(&sc->arpcom.ac_if, "carrier lost\n");
 861                         }
 862                 }
 863
 864                 p->intr_host = 0;
 865                 p->out_ack = 0;
 866         } else {
 867                 wakeup(sc);
 868
 869                 p->intr_host = 0;
 870         }
 871 }
 872
 873 /* -------------------------------------------------------------------------- */
 874
 875 static int
 876 start_cx28975(struct sbsh_softc *sc, struct cx28975_cfg cfg)
 877 {
 878         static char  thresh[] = { +8, -4, -16, -40 };
 879
 880         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 881         u_int8_t  t, parm[12];
 882
 883         p->intr_host = 0;
 884         t = p->intr_host;
 885
 886         /* reset chip set */
 887         sc->regs->IMR = EXT;
 888         sc->regs->CR  = 0;
 889         sc->regs->SR  = 0xff;
 890         DELAY(2);
 891         sc->regs->CR = XRST;
 892         if (cfg.crc16)
 893                 sc->regs->CR |= CMOD;
 894         if (cfg.fill_7e)
 895                 sc->regs->CR |= FMOD;
 896         if (cfg.inv)
 897                 sc->regs->CR |= PMOD;
 898
 899         sc->regs->CRB |= RODD | RXDE;
 900         if (cfg.rburst)
 901                 sc->regs->CRB |= RDBE;
 902         if (cfg.wburst)
 903                 sc->regs->CRB |= WTBE;
 904
 905         tsleep(sc, 0, "sbsh", 0);
 906         if ((p->out_ack & 0x1f) != _ACK_BOOT_WAKE_UP)
 907                 return (-1);
 908
 909         if (download_firmware(sc, cfg.firmw_image, cfg.firmw_len))
 910                 return (-1);
 911
 912         tsleep(sc, 0, "sbsh", 0);
 913         if ((p->out_ack & 0x1f) != _ACK_OPER_WAKE_UP)
 914                 return (-1);
 915
 916         t = cfg.master ? 1 : 9;
 917         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_ENABLE, &t, 1))
 918                 return (-1);
 919
 920         t = 0x63;
 921         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_CONFIG, &t, 1))
 922                 return (-1);
 923
 924         *(u_int16_t *)parm = cfg.lrate >> 3;
 925         parm[2] = parm[3] = parm[0];
 926         parm[5] = cfg.lrate & 7;
 927         parm[4] = parm[7] = 1;
 928         parm[6] = 0;
 929         if (issue_cx28975_cmd(sc, _DSL_MULTI_RATE_CONFIG, parm, 8))
 930                 return (-1);
 931
 932         parm[0] = 0x02 | (cfg.mod << 4);
 933         parm[1] = 0;
 934         if (issue_cx28975_cmd(sc, _DSL_TRAINING_MODE, parm, 2))
 935                 return (-1);
 936
 937         bzero(parm, 12);
 938         parm[0] = 0x04;         /* pre-activation: G.hs */
 939         parm[4] = 0x04;         /* no remote configuration */
 940         parm[7] = 0x01;         /* annex A (default) */
 941         parm[8] = 0xff;         /* i-bit mask (all bits) */
 942         if (issue_cx28975_cmd(sc, _DSL_PREACTIVATION_CFG, parm, 12))
 943                 return (-1);
 944
 945         parm[0] = 0x03;         /* dying gasp time - 3 frames */
 946         parm[1] = thresh[cfg.mod];
 947         parm[2] = 0xff;         /* attenuation */
 948         parm[3] = 0x04;         /* line probe NMR (+2 dB) */
 949         parm[4] = 0x00;         /* reserved */
 950         parm[5] = 0x00;
 951         if (issue_cx28975_cmd(sc, _DSL_THRESHOLDS, parm, 6))
 952                 return (-1);
 953
 954         t = cfg.master ? 0x23 : 0x21;
 955         if (issue_cx28975_cmd(sc, _DSL_FR_PCM_CONFIG, &t, 1))
 956                 return (-1);
 957
 958         t = 0x02;
 959         if (issue_cx28975_cmd(sc, _DSL_INTR_HOST_MASK, &t, 1))
 960                 return (-1);
 961
 962         sc->state = DOWN;
 963         return (0);
 964 }
 965
 966 static int
 967 download_firmware(struct sbsh_softc *sc, u_int8_t *img, u_int32_t img_len)
 968 {
 969         u_int32_t       t;
 970         int             i;
 971         u_int8_t        cksum = 0;
 972
 973         for (i = 0; i < img_len; ++i)
 974                 cksum += img[i];
 975
 976         t = img_len;
 977         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_START, (u_int8_t *) &t, 4))
 978                 return (-1);
 979
 980         for (i = 0; img_len >= 75; i += 75, img_len -= 75) {
 981                 if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, 75))
 982                         return (-1);
 983         }
 984
 985         if (img_len
 986             &&  issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, img_len))
 987                 return (-1);
 988
 989         t = (cksum ^ 0xff) + 1;
 990         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_END, (u_int8_t *) &t, 1))
 991                 return (-1);
 992
 993         return (0);
 994 }
 995
 996 static int
 997 issue_cx28975_cmd(struct sbsh_softc *sc, u_int8_t cmd,
 998                         u_int8_t *data, u_int8_t size)
 999 {
1000         volatile struct cx28975_cmdarea  *p = sc->cmdp;
1001         volatile u_int8_t  *databuf = p->in_data;
1002         int  i;
1003
1004         u_int8_t  cksum = 0;
1005
1006         p->in_dest      = 0xf0;
1007         p->in_opcode    = cmd;
1008         p->in_zero      = 0;
1009         p->in_length    = --size;
1010         p->in_csum      = 0xf0 ^ cmd ^ size ^ 0xaa;
1011
1012         for (i = 0; i <= size; ++i) {
1013                 cksum ^= *data;
1014                 *databuf++ = *data++;   /* only 1 byte per cycle! */
1015         }
1016
1017         p->in_datasum   = cksum ^ 0xaa;
1018         p->out_ack      = _ACK_NOT_COMPLETE;
1019         p->intr_8051    = 0xfe;
1020
1021         if (tsleep(sc, 0, "sbsh", hz << 3))
1022                 return (-1);
1023
1024         while (p->out_ack == _ACK_NOT_COMPLETE)
1025                 ;                                       /* FIXME ! */
1026
1027         if ((p->out_ack & 0x1f) == _ACK_PASS) {
1028                 p->out_ack = 0;
1029                 return (0);
1030         } else {
1031                 p->out_ack = 0;
1032                 return (-1);
1033         }
1034 }