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         ifp->if_cpuid = rman_get_cpuid(sc->irq_res);
 279         KKASSERT(ifp->if_cpuid >= 0 && ifp->if_cpuid < ncpus);
 280
 281         return(0);
 282
 283 fail:
 284         sbsh_detach(dev);
 285         return (error);
 286 }
 287
 288 static int
 289 sbsh_detach(device_t dev)
 290 {
 291         struct sbsh_softc *sc = device_get_softc(dev);
 292         struct ifnet *ifp = &sc->arpcom.ac_if;
 293
 294         if (device_is_attached(dev)) {
 295                 lwkt_serialize_enter(ifp->if_serializer);
 296                 sbsh_stop(sc);
 297                 bus_teardown_intr(dev, sc->irq_res, sc->intr_hand);
 298                 lwkt_serialize_exit(ifp->if_serializer);
 299
 300                 ether_ifdetach(ifp);
 301         }
 302
 303         if (sc->irq_res)
 304                 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
 305         if (sc->mem_res) {
 306                 bus_release_resource(dev, SYS_RES_MEMORY, PCIR_MAPS + 4,
 307                                      sc->mem_res);
 308         }
 309
 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
 319         if (sc->state == ACTIVE)
 320                 start_xmit_frames(ifp->if_softc);
 321 }
 322
 323
 324 static void
 325 sbsh_init(void *xsc)
 326 {
 327         struct sbsh_softc       *sc = xsc;
 328         struct ifnet            *ifp = &sc->arpcom.ac_if;
 329         u_int8_t                t;
 330
 331         if ((ifp->if_flags & IFF_RUNNING) || sc->state == NOT_LOADED) {
 332                 return;
 333         }
 334
 335         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 336         sc->head_xq = sc->tail_xq = sc->head_rq = sc->tail_rq = 0;
 337         sc->head_tdesc = sc->head_rdesc = 0;
 338
 339         sc->regs->IMR = EXT;
 340         t = 2;
 341         issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1);
 342         if (issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1) == 0) {
 343                 sc->state = ACTIVATION;
 344
 345                 ifp->if_flags |= IFF_RUNNING;
 346                 ifq_clr_oactive(&ifp->if_snd);
 347         }
 348 }
 349
 350
 351 static void
 352 sbsh_stop(struct sbsh_softc *sc)
 353 {
 354         u_int8_t  t;
 355
 356         sc->regs->IMR = EXT;
 357
 358         t = 0;
 359         issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1);
 360         if (sc->state == ACTIVE) {
 361                 t = 1;
 362                 issue_cx28975_cmd(sc, _DSL_FORCE_DEACTIVATE, &t, 1);
 363                 /* FIX! activation manager state */
 364
 365                 /* Is it really must be done here? It calls from intr handler */
 366                 deactivate(sc);
 367         }
 368
 369         sc->regs->IMR = 0;
 370         sc->state = DOWN;
 371 }
 372
 373
 374 static void
 375 init_card(struct sbsh_softc *sc)
 376 {
 377         sc->state = NOT_LOADED;
 378         sc->tbd  = (struct hw_descr *) sc->mem_base;
 379         sc->rbd  = (struct hw_descr *) ((u_int8_t *)sc->mem_base + 0x400);
 380         sc->regs = (struct sbni16_hw_regs *) ((u_int8_t *)sc->mem_base + 0x800);
 381         sc->cmdp = (struct cx28975_cmdarea *) ((u_int8_t *)sc->mem_base + 0xc00);
 382
 383         sc->regs->CR = 0;
 384         sc->regs->SR = 0xff;
 385         sc->regs->IMR = 0;
 386 }
 387
 388
 389 static int
 390 sbsh_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 391 {
 392         struct sbsh_softc       *sc = ifp->if_softc;
 393         struct ifreq            *ifr = (struct ifreq *) data;
 394         struct cx28975_cfg      cfg;
 395         struct dsl_stats        ds;
 396         int                     error = 0;
 397         u_int8_t                t;
 398
 399         switch(cmd) {
 400         case SIOCLOADFIRMW:
 401                 if ((error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY)) != 0)
 402                         break;
 403                 if (ifp->if_flags & IFF_UP)
 404                         error = EBUSY;
 405
 406                 bcopy((caddr_t)ifr->ifr_data, (caddr_t)&cfg, sizeof cfg);
 407                 if (start_cx28975(sc, cfg) == 0) {
 408                         static char  *modstr[] = {
 409                                 "TCPAM32", "TCPAM16", "TCPAM8", "TCPAM4" };
 410                         if_printf(&sc->arpcom.ac_if, "%s, rate %d, %s\n",
 411                                 cfg.master ? "master" : "slave",
 412                                 cfg.lrate << 3, modstr[cfg.mod]);
 413                 } else {
 414                         if_printf(&sc->arpcom.ac_if,
 415                                 "unable to load firmware\n");
 416                         error = EIO;
 417                 }
 418                 break;
 419
 420         case  SIOCGETSTATS :
 421                 if ((error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY)) != 0)
 422                         break;
 423
 424                 t = 0;
 425                 if (issue_cx28975_cmd(sc, _DSL_FAR_END_ATTEN, &t, 1))
 426                         error = EIO;
 427                 ds.attenuat = sc->cmdp->out_data[0];
 428
 429                 if (issue_cx28975_cmd(sc, _DSL_NOISE_MARGIN, &t, 1))
 430                         error = EIO;
 431                 ds.nmr = sc->cmdp->out_data[0];
 432
 433                 if (issue_cx28975_cmd(sc, _DSL_POWER_BACK_OFF_RESULT, &t, 1))
 434                         error = EIO;
 435                 ds.tpbo = sc->cmdp->out_data[0];
 436                 ds.rpbo = sc->cmdp->out_data[1];
 437
 438                 if (!issue_cx28975_cmd(sc, _DSL_HDSL_PERF_ERR_CTRS, &t, 1)) {
 439                         int i;
 440                         for (i = 0; i < 10; ++i)
 441                                 ((u_int8_t *) &ds.losw)[i] =
 442                                         sc->cmdp->out_data[i];
 443                 } else
 444                         error = EIO;
 445
 446                 ds.status_1 = ((volatile u_int8_t *)sc->cmdp)[0x3c0];
 447                 ds.status_3 = ((volatile u_int8_t *)sc->cmdp)[0x3c2];
 448
 449                 bcopy(&sc->in_stats, ifr->ifr_data, sizeof(struct sbni16_stats));
 450                 bcopy(&ds, (char *)ifr->ifr_data + sizeof(struct sbni16_stats),
 451                     sizeof(struct dsl_stats));
 452                 break;
 453
 454         case  SIOCCLRSTATS :
 455                 if (!(error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY))) {
 456                         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 457                         t = 2;
 458                         if (issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1))
 459                                 error = EIO;
 460                 }
 461                 break;
 462         case SIOCSIFFLAGS:
 463                 if (ifp->if_flags & IFF_UP) {
 464                         if (!(ifp->if_flags & IFF_RUNNING)) {
 465                                 if (sc->state == NOT_LOADED) {
 466                                         if_printf(ifp, "firmware wasn't loaded\n");
 467                                         error = EBUSY;
 468                                 } else
 469                                         sbsh_init(sc);
 470                         }
 471                 } else {
 472                         if (ifp->if_flags & IFF_RUNNING) {
 473                                 sbsh_stop(sc);
 474                                 ifp->if_flags &= ~IFF_RUNNING;
 475                         }
 476                 }
 477                 break;
 478
 479         case SIOCADDMULTI:
 480         case SIOCDELMULTI:
 481                 error = 0;
 482                 break;
 483         default:
 484                 error = ether_ioctl(ifp, cmd, data);
 485                 break;
 486         }
 487         return (error);
 488 }
 489
 490
 491 static void
 492 sbsh_shutdown(device_t dev)
 493 {
 494         struct sbsh_softc       *sc = device_get_softc(dev);
 495
 496         lwkt_serialize_enter(sc->arpcom.ac_if.if_serializer);
 497         sbsh_stop(sc);
 498         lwkt_serialize_exit(sc->arpcom.ac_if.if_serializer);
 499 }
 500
 501 static int
 502 sbsh_suspend(device_t dev)
 503 {
 504         struct sbsh_softc *sc = device_get_softc(dev);
 505
 506         lwkt_serialize_enter(sc->arpcom.ac_if.if_serializer);
 507         sbsh_stop(sc);
 508         lwkt_serialize_exit(sc->arpcom.ac_if.if_serializer);
 509
 510         return (0);
 511 }
 512
 513 static int
 514 sbsh_resume(device_t dev)
 515 {
 516         struct sbsh_softc *sc = device_get_softc(dev);
 517         struct ifnet *ifp = &sc->arpcom.ac_if;
 518
 519         if (ifp->if_flags & IFF_UP)
 520                 sbsh_init(sc);
 521
 522         return (0);
 523 }
 524
 525
 526 static void
 527 sbsh_watchdog(struct ifnet *ifp)
 528 {
 529         struct sbsh_softc       *sc = ifp->if_softc;
 530
 531         if_printf(ifp, "transmit timeout\n");
 532
 533         if (sc->regs->SR & TXS) {
 534                 sc->regs->SR = TXS;
 535                 if_printf(ifp, "interrupt posted but not delivered\n");
 536         }
 537         free_sent_buffers(sc);
 538 }
 539
 540 /* -------------------------------------------------------------------------- */
 541
 542 static void
 543 sbsh_intr(void *arg)
 544 {
 545         struct sbsh_softc  *sc = (struct sbsh_softc *)arg;
 546         u_int8_t  status = sc->regs->SR;
 547
 548         if (status == 0)
 549                 return;
 550
 551         if (status & EXT) {
 552                 cx28975_interrupt(sc);
 553                 sc->regs->SR = EXT;
 554         }
 555
 556         if (status & UFL) {
 557                 resume_tx(sc);
 558                 sc->regs->SR = UFL;
 559                 ++sc->in_stats.ufl_errs;
 560                 ++sc->arpcom.ac_if.if_oerrors;
 561         }
 562
 563         if (status & RXS) {
 564                 sc->regs->SR = RXS;
 565                 indicate_frames(sc);
 566                 alloc_rx_buffers(sc);
 567         }
 568
 569         if (status & TXS) {
 570                 sc->regs->SR = TXS;
 571                 free_sent_buffers(sc);
 572         }
 573
 574         if (status & CRC) {
 575                 ++sc->in_stats.crc_errs;
 576                 ++sc->arpcom.ac_if.if_ierrors;
 577                 sc->regs->SR = CRC;
 578         }
 579
 580         if (status & OFL) {
 581                 ++sc->in_stats.ofl_errs;
 582                 ++sc->arpcom.ac_if.if_ierrors;
 583                 sc->regs->SR = OFL;
 584         }
 585 }
 586
 587 /*
 588  * Look for a first descriptor of a next packet, and write it's number
 589  * into CTDR. Then enable the transmitter.
 590  */
 591 static void
 592 resume_tx(struct sbsh_softc *sc)
 593 {
 594         u_int32_t       cur_tbd = sc->regs->CTDR;
 595
 596         while (cur_tbd != sc->regs->LTDR
 597                 && (sc->tbd[cur_tbd++].length & LAST_FRAG) == 0)
 598                 ;
 599         sc->regs->CTDR = cur_tbd;
 600         sc->regs->CR |= TXEN;
 601 }
 602
 603 static void
 604 start_xmit_frames(struct sbsh_softc *sc)
 605 {
 606         struct ifnet    *ifp = &sc->arpcom.ac_if;
 607         struct mbuf     *m;
 608
 609         /*
 610          * Check if we have any free descriptor(s) and free space in
 611          * our transmit queue.
 612          */
 613         while (sc->tail_xq != ((sc->head_xq - 1) & (XQLEN - 1))
 614             && sc->regs->LTDR != ((sc->head_tdesc - 1) & 0x7f)) {
 615
 616                 m = ifq_dequeue(&ifp->if_snd, NULL);
 617                 if (m == NULL)
 618                         break;
 619                 if (m->m_pkthdr.len) {
 620                         BPF_MTAP(ifp, m);
 621                         encap_frame(sc, m);
 622                 } else
 623                         m_freem(m);
 624         }
 625
 626         if (sc->regs->CTDR != sc->regs->LTDR)
 627                 ifq_set_oactive(&ifp->if_snd);
 628         else
 629                 ifq_clr_oactive(&ifp->if_snd);
 630 }
 631
 632
 633 static void
 634 encap_frame(struct sbsh_softc *sc, struct mbuf *m_head)
 635 {
 636         struct mbuf     *m;
 637         u_int32_t       cur_tbd;
 638         int  done;
 639
 640 look_for_nonzero:
 641         for (m = m_head; !m->m_len; m = m->m_next)
 642                 ;
 643
 644         cur_tbd = sc->regs->LTDR & 0x7f;
 645         done = 0;
 646         do {
 647                 if (m->m_len < 5 || cur_tbd == ((sc->head_tdesc - 1) & 0x7f)) {
 648                         if ((m_head = repack(sc, m_head)) != NULL)
 649                                 goto look_for_nonzero;
 650                         else
 651                                 return;
 652                 }
 653
 654                 sc->tbd[cur_tbd].address = vtophys(mtod(m, vm_offset_t));
 655                 sc->tbd[cur_tbd].length  = m->m_len;
 656
 657                 do {
 658                         m = m->m_next;
 659                 } while (m && !m->m_len);
 660
 661                 if (!m) {       /* last fragment has been reached */
 662                         sc->tbd[cur_tbd].length |= LAST_FRAG;
 663                         done = 1;
 664                 }
 665
 666                 ++cur_tbd;
 667                 cur_tbd &= 0x7f;
 668         } while (!done);
 669
 670         sc->xq[sc->tail_xq++] = m_head;
 671         sc->tail_xq &= (XQLEN - 1);
 672
 673         sc->regs->LTDR = cur_tbd;
 674         ++sc->in_stats.sent_pkts;
 675         ++sc->arpcom.ac_if.if_opackets;
 676 }
 677
 678 static struct mbuf *
 679 repack(struct sbsh_softc *sc, struct mbuf *m)
 680 {
 681         struct mbuf  *m_new;
 682
 683         MGETHDR(m_new, MB_DONTWAIT, MT_DATA);
 684         if (!m_new) {
 685                 if_printf (&sc->arpcom.ac_if,
 686                            "unable to get mbuf.\n");
 687                 return (NULL);
 688         }
 689
 690         if (m->m_pkthdr.len > MHLEN) {
 691                 MCLGET(m_new, MB_DONTWAIT);
 692                 if (!(m_new->m_flags & M_EXT)) {
 693                         m_freem(m_new);
 694                         if_printf (&sc->arpcom.ac_if,
 695                                    "unable to get mbuf cluster.\n");
 696                         return (NULL);
 697                 }
 698         }
 699
 700         m_copydata(m, 0, m->m_pkthdr.len, mtod(m_new, caddr_t));
 701         m_new->m_pkthdr.len = m_new->m_len = m->m_pkthdr.len;
 702         m_freem(m);
 703         return (m_new);
 704 }
 705
 706 static void
 707 free_sent_buffers(struct sbsh_softc *sc)
 708 {
 709         u_int32_t  cur_tbd;
 710
 711         cur_tbd = sc->regs->CTDR;
 712
 713         while (sc->head_tdesc != cur_tbd) {
 714                 /*
 715                  * Be careful! one element in xq may correspond to
 716                  * multiple descriptors.
 717                  */
 718                 if (sc->tbd[sc->head_tdesc].length & LAST_FRAG) {
 719                         m_freem(sc->xq[sc->head_xq++]);
 720                         sc->head_xq &= (XQLEN - 1);
 721                 }
 722
 723                 sc->tbd[sc->head_tdesc].length = 0;
 724                 sc->head_tdesc = (sc->head_tdesc + 1) & 0x7f;
 725         }
 726
 727         start_xmit_frames(sc);
 728 }
 729
 730 /*
 731  * DON'T use free_sent_buffers to drop the queue!
 732  */
 733 static void
 734 alloc_rx_buffers(struct sbsh_softc *sc)
 735 {
 736         unsigned        cur_rbd = sc->regs->LRDR & 0x7f;
 737         struct mbuf     *m;
 738
 739         while (sc->tail_rq != ((sc->head_rq - 1) & (RQLEN - 1))) {
 740                 MGETHDR(m, MB_DONTWAIT, MT_DATA);
 741                 if (!m) {
 742                         if_printf (&sc->arpcom.ac_if,
 743                                    "unable to get mbuf.\n");
 744                         return;
 745                 }
 746
 747                 if (SBNI16_MAX_FRAME > MHLEN) {
 748                         MCLGET(m, MB_DONTWAIT);
 749                         if (!(m->m_flags & M_EXT)) {
 750                                 m_freem(m);
 751                                 if_printf (&sc->arpcom.ac_if,
 752                                            "unable to get mbuf cluster.\n");
 753                                 return;
 754                         }
 755                         m->m_pkthdr.len = m->m_len = MCLBYTES;
 756                 }
 757
 758                 m_adj(m, 2);    /* align ip on longword boundaries */
 759
 760                 sc->rq[sc->tail_rq++] = m;
 761                 sc->tail_rq &= (RQLEN - 1);
 762
 763                 sc->rbd[cur_rbd].address = vtophys(mtod(m, vm_offset_t));
 764                 sc->rbd[cur_rbd].length  = 0;
 765                 sc->regs->LRDR = cur_rbd = (cur_rbd + 1) & 0x7f;
 766         }
 767 }
 768
 769 static void
 770 indicate_frames(struct sbsh_softc *sc)
 771 {
 772         struct ifnet *ifp = &sc->arpcom.ac_if;
 773         unsigned  cur_rbd = sc->regs->CRDR & 0x7f;
 774
 775         while (sc->head_rdesc != cur_rbd) {
 776                 struct mbuf  *m = sc->rq[sc->head_rq++];
 777                 sc->head_rq &= (RQLEN - 1);
 778
 779                 m->m_pkthdr.len = m->m_len =
 780                                 sc->rbd[sc->head_rdesc].length & 0x7ff;
 781                 m->m_pkthdr.rcvif = ifp;
 782
 783                 ifp->if_input(ifp, m);
 784                 ++sc->in_stats.rcvd_pkts;
 785                 ++ifp->if_ipackets;
 786
 787                 sc->head_rdesc = (sc->head_rdesc + 1) & 0x7f;
 788         }
 789 }
 790
 791 static void
 792 drop_queues(struct sbsh_softc *sc)
 793 {
 794         while (sc->head_rq != sc->tail_rq) {
 795                 m_freem(sc->rq[sc->head_rq++]);
 796                 sc->head_rq &= (RQLEN - 1);
 797         }
 798
 799         while (sc->head_xq != sc->tail_xq) {
 800                 m_freem(sc->xq[sc->head_xq++]);
 801                 sc->head_xq &= (XQLEN - 1);
 802         }
 803 }
 804
 805 /* -------------------------------------------------------------------------- */
 806
 807 static void
 808 activate(struct sbsh_softc *sc)
 809 {
 810         struct timeval  tv;
 811
 812         sc->regs->SR   = 0xff;          /* clear it! */
 813         sc->regs->CTDR = sc->regs->LTDR = sc->regs->CRDR = sc->regs->LRDR = 0;
 814
 815         sc->head_tdesc = sc->head_rdesc = 0;
 816         alloc_rx_buffers(sc);
 817
 818         sc->regs->CRB &= ~RXDE;
 819         sc->regs->IMR = EXT | RXS | TXS | CRC | OFL | UFL;
 820         sc->regs->CR |= TXEN | RXEN;
 821
 822         sc->state = ACTIVE;
 823         ++sc->in_stats.attempts;
 824         microtime(&tv);
 825         sc->in_stats.last_time = tv.tv_sec;
 826         start_xmit_frames(sc);
 827 }
 828
 829 static void
 830 deactivate(struct sbsh_softc *sc)
 831 {
 832         sc->regs->CR &= ~(RXEN | TXEN);
 833         sc->regs->CRB |= RXDE;
 834         sc->regs->IMR  = EXT;
 835         sc->regs->CTDR = sc->regs->LTDR;
 836         sc->regs->CRDR = sc->regs->LRDR;
 837         sc->state = ACTIVATION;
 838
 839         drop_queues(sc);
 840 }
 841
 842 /* -------------------------------------------------------------------------- */
 843
 844 static void
 845 cx28975_interrupt(struct sbsh_softc *sc)
 846 {
 847         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 848
 849         if (p->intr_host != 0xfe)
 850                 return;
 851
 852         if (p->out_ack & 0x80) {
 853                 if (*((volatile u_int8_t *)p + 0x3c7) & 2) {
 854                         if (sc->state != ACTIVE
 855                             && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) == 0x40) {
 856                                 activate(sc);
 857                                 if_printf(&sc->arpcom.ac_if, "connected to peer\n");
 858                         } else if (sc->state == ACTIVE
 859                                  && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) != 0x40) {
 860                                 deactivate(sc);
 861                                 if_printf(&sc->arpcom.ac_if, "carrier lost\n");
 862                         }
 863                 }
 864
 865                 p->intr_host = 0;
 866                 p->out_ack = 0;
 867         } else {
 868                 wakeup(sc);
 869
 870                 p->intr_host = 0;
 871         }
 872 }
 873
 874 /* -------------------------------------------------------------------------- */
 875
 876 static int
 877 start_cx28975(struct sbsh_softc *sc, struct cx28975_cfg cfg)
 878 {
 879         static char  thresh[] = { +8, -4, -16, -40 };
 880
 881         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 882         u_int8_t  t, parm[12];
 883
 884         p->intr_host = 0;
 885         t = p->intr_host;
 886
 887         /* reset chip set */
 888         sc->regs->IMR = EXT;
 889         sc->regs->CR  = 0;
 890         sc->regs->SR  = 0xff;
 891         DELAY(2);
 892         sc->regs->CR = XRST;
 893         if (cfg.crc16)
 894                 sc->regs->CR |= CMOD;
 895         if (cfg.fill_7e)
 896                 sc->regs->CR |= FMOD;
 897         if (cfg.inv)
 898                 sc->regs->CR |= PMOD;
 899
 900         sc->regs->CRB |= RODD | RXDE;
 901         if (cfg.rburst)
 902                 sc->regs->CRB |= RDBE;
 903         if (cfg.wburst)
 904                 sc->regs->CRB |= WTBE;
 905
 906         tsleep(sc, 0, "sbsh", 0);
 907         if ((p->out_ack & 0x1f) != _ACK_BOOT_WAKE_UP)
 908                 return (-1);
 909
 910         if (download_firmware(sc, cfg.firmw_image, cfg.firmw_len))
 911                 return (-1);
 912
 913         tsleep(sc, 0, "sbsh", 0);
 914         if ((p->out_ack & 0x1f) != _ACK_OPER_WAKE_UP)
 915                 return (-1);
 916
 917         t = cfg.master ? 1 : 9;
 918         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_ENABLE, &t, 1))
 919                 return (-1);
 920
 921         t = 0x63;
 922         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_CONFIG, &t, 1))
 923                 return (-1);
 924
 925         *(u_int16_t *)parm = cfg.lrate >> 3;
 926         parm[2] = parm[3] = parm[0];
 927         parm[5] = cfg.lrate & 7;
 928         parm[4] = parm[7] = 1;
 929         parm[6] = 0;
 930         if (issue_cx28975_cmd(sc, _DSL_MULTI_RATE_CONFIG, parm, 8))
 931                 return (-1);
 932
 933         parm[0] = 0x02 | (cfg.mod << 4);
 934         parm[1] = 0;
 935         if (issue_cx28975_cmd(sc, _DSL_TRAINING_MODE, parm, 2))
 936                 return (-1);
 937
 938         bzero(parm, 12);
 939         parm[0] = 0x04;         /* pre-activation: G.hs */
 940         parm[4] = 0x04;         /* no remote configuration */
 941         parm[7] = 0x01;         /* annex A (default) */
 942         parm[8] = 0xff;         /* i-bit mask (all bits) */
 943         if (issue_cx28975_cmd(sc, _DSL_PREACTIVATION_CFG, parm, 12))
 944                 return (-1);
 945
 946         parm[0] = 0x03;         /* dying gasp time - 3 frames */
 947         parm[1] = thresh[cfg.mod];
 948         parm[2] = 0xff;         /* attenuation */
 949         parm[3] = 0x04;         /* line probe NMR (+2 dB) */
 950         parm[4] = 0x00;         /* reserved */
 951         parm[5] = 0x00;
 952         if (issue_cx28975_cmd(sc, _DSL_THRESHOLDS, parm, 6))
 953                 return (-1);
 954
 955         t = cfg.master ? 0x23 : 0x21;
 956         if (issue_cx28975_cmd(sc, _DSL_FR_PCM_CONFIG, &t, 1))
 957                 return (-1);
 958
 959         t = 0x02;
 960         if (issue_cx28975_cmd(sc, _DSL_INTR_HOST_MASK, &t, 1))
 961                 return (-1);
 962
 963         sc->state = DOWN;
 964         return (0);
 965 }
 966
 967 static int
 968 download_firmware(struct sbsh_softc *sc, u_int8_t *img, u_int32_t img_len)
 969 {
 970         u_int32_t       t;
 971         int             i;
 972         u_int8_t        cksum = 0;
 973
 974         for (i = 0; i < img_len; ++i)
 975                 cksum += img[i];
 976
 977         t = img_len;
 978         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_START, (u_int8_t *) &t, 4))
 979                 return (-1);
 980
 981         for (i = 0; img_len >= 75; i += 75, img_len -= 75) {
 982                 if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, 75))
 983                         return (-1);
 984         }
 985
 986         if (img_len
 987             &&  issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, img_len))
 988                 return (-1);
 989
 990         t = (cksum ^ 0xff) + 1;
 991         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_END, (u_int8_t *) &t, 1))
 992                 return (-1);
 993
 994         return (0);
 995 }
 996
 997 static int
 998 issue_cx28975_cmd(struct sbsh_softc *sc, u_int8_t cmd,
 999                         u_int8_t *data, u_int8_t size)
1000 {
1001         volatile struct cx28975_cmdarea  *p = sc->cmdp;
1002         volatile u_int8_t  *databuf = p->in_data;
1003         int  i;
1004
1005         u_int8_t  cksum = 0;
1006
1007         p->in_dest      = 0xf0;
1008         p->in_opcode    = cmd;
1009         p->in_zero      = 0;
1010         p->in_length    = --size;
1011         p->in_csum      = 0xf0 ^ cmd ^ size ^ 0xaa;
1012
1013         for (i = 0; i <= size; ++i) {
1014                 cksum ^= *data;
1015                 *databuf++ = *data++;   /* only 1 byte per cycle! */
1016         }
1017
1018         p->in_datasum   = cksum ^ 0xaa;
1019         p->out_ack      = _ACK_NOT_COMPLETE;
1020         p->intr_8051    = 0xfe;
1021
1022         if (tsleep(sc, 0, "sbsh", hz << 3))
1023                 return (-1);
1024
1025         while (p->out_ack == _ACK_NOT_COMPLETE)
1026                 ;                                       /* FIXME ! */
1027
1028         if ((p->out_ack & 0x1f) == _ACK_PASS) {
1029                 p->out_ack = 0;
1030                 return (0);
1031         } else {
1032                 p->out_ack = 0;
1033                 return (-1);
1034         }
1035 }