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 1.19 2005/06/12 17:44:29 joerg 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 <sys/thread2.h>
  40
  41 #include <net/if.h>
  42 #include <net/ifq_var.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, 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, 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;
 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                 printf ("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                 printf("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);
 268
 269         error = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_NET,
 270                                 sbsh_intr, sc, &sc->intr_hand, NULL);
 271         if (error) {
 272                 ether_ifdetach(ifp);
 273                 printf("sbsh%d: couldn't set up irq\n", unit);
 274                 goto fail;
 275         }
 276
 277         return(0);
 278
 279 fail:
 280         sbsh_detach(dev);
 281         return (error);
 282 }
 283
 284 static int
 285 sbsh_detach(device_t dev)
 286 {
 287         struct sbsh_softc *sc = device_get_softc(dev);
 288         struct ifnet *ifp = &sc->arpcom.ac_if;
 289
 290         crit_enter();
 291
 292         if (device_is_attached(dev)) {
 293                 sbsh_stop(sc);
 294                 ether_ifdetach(ifp);
 295         }
 296
 297         if (sc->intr_hand)
 298                 bus_teardown_intr(dev, sc->irq_res, sc->intr_hand);
 299
 300         crit_exit();
 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         return (0);
 309 }
 310
 311
 312 static void
 313 sbsh_start(struct ifnet *ifp)
 314 {
 315         struct sbsh_softc  *sc = ifp->if_softc;
 316
 317         crit_enter();
 318
 319         if (sc->state == ACTIVE)
 320                 start_xmit_frames(ifp->if_softc);
 321
 322         crit_exit();
 323 }
 324
 325
 326 static void
 327 sbsh_init(void *xsc)
 328 {
 329         struct sbsh_softc       *sc = xsc;
 330         struct ifnet            *ifp = &sc->arpcom.ac_if;
 331         u_int8_t                t;
 332
 333         crit_enter();
 334
 335         if ((ifp->if_flags & IFF_RUNNING) || sc->state == NOT_LOADED) {
 336                 crit_exit();
 337                 return;
 338         }
 339
 340         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 341         sc->head_xq = sc->tail_xq = sc->head_rq = sc->tail_rq = 0;
 342         sc->head_tdesc = sc->head_rdesc = 0;
 343
 344         sc->regs->IMR = EXT;
 345         t = 2;
 346         issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1);
 347         if (issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1) == 0) {
 348                 sc->state = ACTIVATION;
 349
 350                 ifp->if_flags |= IFF_RUNNING;
 351                 ifp->if_flags &= ~IFF_OACTIVE;
 352         }
 353
 354         crit_exit();
 355 }
 356
 357
 358 static void
 359 sbsh_stop(struct sbsh_softc *sc)
 360 {
 361         u_int8_t  t;
 362
 363         crit_enter();
 364
 365         sc->regs->IMR = EXT;
 366
 367         t = 0;
 368         issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1);
 369         if (sc->state == ACTIVE) {
 370                 t = 1;
 371                 issue_cx28975_cmd(sc, _DSL_FORCE_DEACTIVATE, &t, 1);
 372                 /* FIX! activation manager state */
 373
 374                 /* Is it really must be done here? It calls from intr handler */
 375                 deactivate(sc);
 376         }
 377
 378         sc->regs->IMR = 0;
 379         sc->state = DOWN;
 380
 381         crit_enter();
 382 }
 383
 384
 385 static void
 386 init_card(struct sbsh_softc *sc)
 387 {
 388         sc->state = NOT_LOADED;
 389         sc->tbd  = (struct hw_descr *) sc->mem_base;
 390         sc->rbd  = (struct hw_descr *) ((u_int8_t *)sc->mem_base + 0x400);
 391         sc->regs = (struct sbni16_hw_regs *) ((u_int8_t *)sc->mem_base + 0x800);
 392         sc->cmdp = (struct cx28975_cmdarea *) ((u_int8_t *)sc->mem_base + 0xc00);
 393
 394         sc->regs->CR = 0;
 395         sc->regs->SR = 0xff;
 396         sc->regs->IMR = 0;
 397 }
 398
 399
 400 static int
 401 sbsh_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 402 {
 403         struct sbsh_softc       *sc = ifp->if_softc;
 404         struct ifreq            *ifr = (struct ifreq *) data;
 405         struct cx28975_cfg      cfg;
 406         struct dsl_stats        ds;
 407         int                     error = 0;
 408         u_int8_t                t;
 409
 410         crit_enter();
 411
 412         switch(cmd) {
 413         case SIOCLOADFIRMW:
 414                 if ((error = suser_cred(cr, NULL_CRED_OKAY)) != 0)
 415                         break;
 416                 if (ifp->if_flags & IFF_UP)
 417                         error = EBUSY;
 418
 419                 bcopy((caddr_t)ifr->ifr_data, (caddr_t)&cfg, sizeof cfg);
 420                 if (start_cx28975(sc, cfg) == 0) {
 421                         static char  *modstr[] = {
 422                                 "TCPAM32", "TCPAM16", "TCPAM8", "TCPAM4" };
 423                         if_printf(&sc->arpcom.ac_if, "%s, rate %d, %s\n",
 424                                 cfg.master ? "master" : "slave",
 425                                 cfg.lrate << 3, modstr[cfg.mod]);
 426                 } else {
 427                         if_printf(&sc->arpcom.ac_if,
 428                                 "unable to load firmware\n");
 429                         error = EIO;
 430                 }
 431                 break;
 432
 433         case  SIOCGETSTATS :
 434                 if ((error = suser_cred(cr, NULL_CRED_OKAY)) != 0)
 435                         break;
 436
 437                 t = 0;
 438                 if (issue_cx28975_cmd(sc, _DSL_FAR_END_ATTEN, &t, 1))
 439                         error = EIO;
 440                 ds.attenuat = sc->cmdp->out_data[0];
 441
 442                 if (issue_cx28975_cmd(sc, _DSL_NOISE_MARGIN, &t, 1))
 443                         error = EIO;
 444                 ds.nmr = sc->cmdp->out_data[0];
 445
 446                 if (issue_cx28975_cmd(sc, _DSL_POWER_BACK_OFF_RESULT, &t, 1))
 447                         error = EIO;
 448                 ds.tpbo = sc->cmdp->out_data[0];
 449                 ds.rpbo = sc->cmdp->out_data[1];
 450
 451                 if (!issue_cx28975_cmd(sc, _DSL_HDSL_PERF_ERR_CTRS, &t, 1)) {
 452                         int i;
 453                         for (i = 0; i < 10; ++i)
 454                                 ((u_int8_t *) &ds.losw)[i] =
 455                                         sc->cmdp->out_data[i];
 456                 } else
 457                         error = EIO;
 458
 459                 ds.status_1 = ((volatile u_int8_t *)sc->cmdp)[0x3c0];
 460                 ds.status_3 = ((volatile u_int8_t *)sc->cmdp)[0x3c2];
 461
 462                 bcopy(&sc->in_stats, ifr->ifr_data, sizeof(struct sbni16_stats));
 463                 bcopy(&ds, (char *)ifr->ifr_data + sizeof(struct sbni16_stats),
 464                     sizeof(struct dsl_stats));
 465                 break;
 466
 467         case  SIOCCLRSTATS :
 468                 if (!(error = suser_cred(cr, NULL_CRED_OKAY))) {
 469                         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 470                         t = 2;
 471                         if (issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1))
 472                                 error = EIO;
 473                 }
 474                 break;
 475         case SIOCSIFFLAGS:
 476                 if (ifp->if_flags & IFF_UP) {
 477                         if (!(ifp->if_flags & IFF_RUNNING)) {
 478                                 if (sc->state == NOT_LOADED) {
 479                                         if_printf(ifp, "firmware wasn't loaded\n");
 480                                         error = EBUSY;
 481                                 } else
 482                                         sbsh_init(sc);
 483                         }
 484                 } else {
 485                         if (ifp->if_flags & IFF_RUNNING) {
 486                                 sbsh_stop(sc);
 487                                 ifp->if_flags &= ~IFF_RUNNING;
 488                         }
 489                 }
 490                 break;
 491
 492         case SIOCADDMULTI:
 493         case SIOCDELMULTI:
 494                 error = 0;
 495                 break;
 496         default:
 497                 error = ether_ioctl(ifp, cmd, data);
 498                 break;
 499         }
 500
 501         crit_exit();
 502
 503         return (error);
 504 }
 505
 506
 507 static void
 508 sbsh_shutdown(device_t dev)
 509 {
 510         struct sbsh_softc       *sc = device_get_softc(dev);
 511
 512         sbsh_stop(sc);
 513 }
 514
 515 static int
 516 sbsh_suspend(device_t dev)
 517 {
 518         struct sbsh_softc *sc = device_get_softc(dev);
 519
 520         crit_enter();
 521
 522         sbsh_stop(sc);
 523
 524         crit_exit();
 525
 526         return (0);
 527 }
 528
 529 static int
 530 sbsh_resume(device_t dev)
 531 {
 532         struct sbsh_softc *sc = device_get_softc(dev);
 533         struct ifnet *ifp = &sc->arpcom.ac_if;
 534
 535         crit_enter();
 536
 537         if (ifp->if_flags & IFF_UP)
 538                 sbsh_init(sc);
 539
 540         crit_exit();
 541
 542         return (0);
 543 }
 544
 545
 546 static void
 547 sbsh_watchdog(struct ifnet *ifp)
 548 {
 549         struct sbsh_softc       *sc = ifp->if_softc;
 550
 551         if_printf(ifp, "transmit timeout\n");
 552
 553         if (sc->regs->SR & TXS) {
 554                 sc->regs->SR = TXS;
 555                 if_printf(ifp, "interrupt posted but not delivered\n");
 556         }
 557         free_sent_buffers(sc);
 558 }
 559
 560 /* -------------------------------------------------------------------------- */
 561
 562 static void
 563 sbsh_intr(void *arg)
 564 {
 565         struct sbsh_softc  *sc = (struct sbsh_softc *)arg;
 566         u_int8_t  status = sc->regs->SR;
 567
 568         if (status == 0)
 569                 return;
 570
 571         if (status & EXT) {
 572                 cx28975_interrupt(sc);
 573                 sc->regs->SR = EXT;
 574         }
 575
 576         if (status & UFL) {
 577                 resume_tx(sc);
 578                 sc->regs->SR = UFL;
 579                 ++sc->in_stats.ufl_errs;
 580                 ++sc->arpcom.ac_if.if_oerrors;
 581         }
 582
 583         if (status & RXS) {
 584                 sc->regs->SR = RXS;
 585                 indicate_frames(sc);
 586                 alloc_rx_buffers(sc);
 587         }
 588
 589         if (status & TXS) {
 590                 sc->regs->SR = TXS;
 591                 free_sent_buffers(sc);
 592         }
 593
 594         if (status & CRC) {
 595                 ++sc->in_stats.crc_errs;
 596                 ++sc->arpcom.ac_if.if_ierrors;
 597                 sc->regs->SR = CRC;
 598         }
 599
 600         if (status & OFL) {
 601                 ++sc->in_stats.ofl_errs;
 602                 ++sc->arpcom.ac_if.if_ierrors;
 603                 sc->regs->SR = OFL;
 604         }
 605 }
 606
 607 /*
 608  * Look for a first descriptor of a next packet, and write it's number
 609  * into CTDR. Then enable the transmitter.
 610  */
 611 static void
 612 resume_tx(struct sbsh_softc *sc)
 613 {
 614         u_int32_t       cur_tbd = sc->regs->CTDR;
 615
 616         while (cur_tbd != sc->regs->LTDR
 617                 && (sc->tbd[cur_tbd++].length & LAST_FRAG) == 0)
 618                 ;
 619         sc->regs->CTDR = cur_tbd;
 620         sc->regs->CR |= TXEN;
 621 }
 622
 623 static void
 624 start_xmit_frames(struct sbsh_softc *sc)
 625 {
 626         struct ifnet    *ifp = &sc->arpcom.ac_if;
 627         struct mbuf     *m;
 628
 629         /*
 630          * Check if we have any free descriptor(s) and free space in
 631          * our transmit queue.
 632          */
 633         while (sc->tail_xq != ((sc->head_xq - 1) & (XQLEN - 1))
 634             && sc->regs->LTDR != ((sc->head_tdesc - 1) & 0x7f)) {
 635
 636                 m = ifq_dequeue(&ifp->if_snd);
 637                 if (m == NULL)
 638                         break;
 639                 if (m->m_pkthdr.len) {
 640                         BPF_MTAP(ifp, m);
 641                         encap_frame(sc, m);
 642                 } else
 643                         m_freem(m);
 644         }
 645
 646         if (sc->regs->CTDR != sc->regs->LTDR)
 647                 ifp->if_flags |= IFF_OACTIVE;
 648         else
 649                 ifp->if_flags &= ~IFF_OACTIVE;
 650 }
 651
 652
 653 static void
 654 encap_frame(struct sbsh_softc *sc, struct mbuf *m_head)
 655 {
 656         struct mbuf     *m;
 657         u_int32_t       cur_tbd;
 658         int  done;
 659
 660 look_for_nonzero:
 661         for (m = m_head; !m->m_len; m = m->m_next)
 662                 ;
 663
 664         cur_tbd = sc->regs->LTDR & 0x7f;
 665         done = 0;
 666         do {
 667                 if (m->m_len < 5 || cur_tbd == ((sc->head_tdesc - 1) & 0x7f)) {
 668                         if ((m_head = repack(sc, m_head)) != NULL)
 669                                 goto look_for_nonzero;
 670                         else
 671                                 return;
 672                 }
 673
 674                 sc->tbd[cur_tbd].address = vtophys(mtod(m, vm_offset_t));
 675                 sc->tbd[cur_tbd].length  = m->m_len;
 676
 677                 do {
 678                         m = m->m_next;
 679                 } while (m && !m->m_len);
 680
 681                 if (!m) {       /* last fragment has been reached */
 682                         sc->tbd[cur_tbd].length |= LAST_FRAG;
 683                         done = 1;
 684                 }
 685
 686                 ++cur_tbd;
 687                 cur_tbd &= 0x7f;
 688         } while (!done);
 689
 690         sc->xq[sc->tail_xq++] = m_head;
 691         sc->tail_xq &= (XQLEN - 1);
 692
 693         sc->regs->LTDR = cur_tbd;
 694         ++sc->in_stats.sent_pkts;
 695         ++sc->arpcom.ac_if.if_opackets;
 696 }
 697
 698 static struct mbuf *
 699 repack(struct sbsh_softc *sc, struct mbuf *m)
 700 {
 701         struct mbuf  *m_new;
 702
 703         MGETHDR(m_new, MB_DONTWAIT, MT_DATA);
 704         if (!m_new) {
 705                 if_printf (&sc->arpcom.ac_if,
 706                            "unable to get mbuf.\n");
 707                 return (NULL);
 708         }
 709
 710         if (m->m_pkthdr.len > MHLEN) {
 711                 MCLGET(m_new, MB_DONTWAIT);
 712                 if (!(m_new->m_flags & M_EXT)) {
 713                         m_freem(m_new);
 714                         if_printf (&sc->arpcom.ac_if,
 715                                    "unable to get mbuf cluster.\n");
 716                         return (NULL);
 717                 }
 718         }
 719
 720         m_copydata(m, 0, m->m_pkthdr.len, mtod(m_new, caddr_t));
 721         m_new->m_pkthdr.len = m_new->m_len = m->m_pkthdr.len;
 722         m_freem(m);
 723         return (m_new);
 724 }
 725
 726 static void
 727 free_sent_buffers(struct sbsh_softc *sc)
 728 {
 729         u_int32_t  cur_tbd;
 730
 731         cur_tbd = sc->regs->CTDR;
 732
 733         while (sc->head_tdesc != cur_tbd) {
 734                 /*
 735                  * Be careful! one element in xq may correspond to
 736                  * multiple descriptors.
 737                  */
 738                 if (sc->tbd[sc->head_tdesc].length & LAST_FRAG) {
 739                         m_freem(sc->xq[sc->head_xq++]);
 740                         sc->head_xq &= (XQLEN - 1);
 741                 }
 742
 743                 sc->tbd[sc->head_tdesc].length = 0;
 744                 sc->head_tdesc = (sc->head_tdesc + 1) & 0x7f;
 745         }
 746
 747         start_xmit_frames(sc);
 748 }
 749
 750 /*
 751  * DON'T use free_sent_buffers to drop the queue!
 752  */
 753 static void
 754 alloc_rx_buffers(struct sbsh_softc *sc)
 755 {
 756         unsigned        cur_rbd = sc->regs->LRDR & 0x7f;
 757         struct mbuf     *m;
 758
 759         while (sc->tail_rq != ((sc->head_rq - 1) & (RQLEN - 1))) {
 760                 MGETHDR(m, MB_DONTWAIT, MT_DATA);
 761                 if (!m) {
 762                         if_printf (&sc->arpcom.ac_if,
 763                                    "unable to get mbuf.\n");
 764                         return;
 765                 }
 766
 767                 if (SBNI16_MAX_FRAME > MHLEN) {
 768                         MCLGET(m, MB_DONTWAIT);
 769                         if (!(m->m_flags & M_EXT)) {
 770                                 m_freem(m);
 771                                 if_printf (&sc->arpcom.ac_if,
 772                                            "unable to get mbuf cluster.\n");
 773                                 return;
 774                         }
 775                         m->m_pkthdr.len = m->m_len = MCLBYTES;
 776                 }
 777
 778                 m_adj(m, 2);    /* align ip on longword boundaries */
 779
 780                 sc->rq[sc->tail_rq++] = m;
 781                 sc->tail_rq &= (RQLEN - 1);
 782
 783                 sc->rbd[cur_rbd].address = vtophys(mtod(m, vm_offset_t));
 784                 sc->rbd[cur_rbd].length  = 0;
 785                 sc->regs->LRDR = cur_rbd = (cur_rbd + 1) & 0x7f;
 786         }
 787 }
 788
 789 static void
 790 indicate_frames(struct sbsh_softc *sc)
 791 {
 792         struct ifnet *ifp = &sc->arpcom.ac_if;
 793         unsigned  cur_rbd = sc->regs->CRDR & 0x7f;
 794
 795         while (sc->head_rdesc != cur_rbd) {
 796                 struct mbuf  *m = sc->rq[sc->head_rq++];
 797                 sc->head_rq &= (RQLEN - 1);
 798
 799                 m->m_pkthdr.len = m->m_len =
 800                                 sc->rbd[sc->head_rdesc].length & 0x7ff;
 801                 m->m_pkthdr.rcvif = ifp;
 802
 803                 (*ifp->if_input)(ifp, m);
 804                 ++sc->in_stats.rcvd_pkts;
 805                 ++ifp->if_ipackets;
 806
 807                 sc->head_rdesc = (sc->head_rdesc + 1) & 0x7f;
 808         }
 809 }
 810
 811 static void
 812 drop_queues(struct sbsh_softc *sc)
 813 {
 814         while (sc->head_rq != sc->tail_rq) {
 815                 m_freem(sc->rq[sc->head_rq++]);
 816                 sc->head_rq &= (RQLEN - 1);
 817         }
 818
 819         while (sc->head_xq != sc->tail_xq) {
 820                 m_freem(sc->xq[sc->head_xq++]);
 821                 sc->head_xq &= (XQLEN - 1);
 822         }
 823 }
 824
 825 /* -------------------------------------------------------------------------- */
 826
 827 static void
 828 activate(struct sbsh_softc *sc)
 829 {
 830         struct timeval  tv;
 831
 832         sc->regs->SR   = 0xff;          /* clear it! */
 833         sc->regs->CTDR = sc->regs->LTDR = sc->regs->CRDR = sc->regs->LRDR = 0;
 834
 835         sc->head_tdesc = sc->head_rdesc = 0;
 836         alloc_rx_buffers(sc);
 837
 838         sc->regs->CRB &= ~RXDE;
 839         sc->regs->IMR = EXT | RXS | TXS | CRC | OFL | UFL;
 840         sc->regs->CR |= TXEN | RXEN;
 841
 842         sc->state = ACTIVE;
 843         ++sc->in_stats.attempts;
 844         microtime(&tv);
 845         sc->in_stats.last_time = tv.tv_sec;
 846         start_xmit_frames(sc);
 847 }
 848
 849 static void
 850 deactivate(struct sbsh_softc *sc)
 851 {
 852         sc->regs->CR &= ~(RXEN | TXEN);
 853         sc->regs->CRB |= RXDE;
 854         sc->regs->IMR  = EXT;
 855         sc->regs->CTDR = sc->regs->LTDR;
 856         sc->regs->CRDR = sc->regs->LRDR;
 857         sc->state = ACTIVATION;
 858
 859         drop_queues(sc);
 860 }
 861
 862 /* -------------------------------------------------------------------------- */
 863
 864 static void
 865 cx28975_interrupt(struct sbsh_softc *sc)
 866 {
 867         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 868         u_int8_t  t;
 869
 870         if (p->intr_host != 0xfe)
 871                 return;
 872
 873         if (p->out_ack & 0x80) {
 874                 if (*((volatile u_int8_t *)p + 0x3c7) & 2) {
 875                         if (sc->state != ACTIVE
 876                             && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) == 0x40) {
 877                                 activate(sc);
 878                                 if_printf(&sc->arpcom.ac_if, "connected to peer\n");
 879                         } else if (sc->state == ACTIVE
 880                                  && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) != 0x40) {
 881                                 deactivate(sc);
 882                                 if_printf(&sc->arpcom.ac_if, "carrier lost\n");
 883                         }
 884                 }
 885
 886                 p->intr_host = 0;
 887                 t = p->intr_host;
 888                 p->out_ack = 0;
 889         } else {
 890                 wakeup(sc);
 891
 892                 p->intr_host = 0;
 893                 t = p->intr_host;
 894         }
 895 }
 896
 897 /* -------------------------------------------------------------------------- */
 898
 899 static int
 900 start_cx28975(struct sbsh_softc *sc, struct cx28975_cfg cfg)
 901 {
 902         static char  thresh[] = { +8, -4, -16, -40 };
 903
 904         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 905         u_int8_t  t, parm[12];
 906
 907         p->intr_host = 0;
 908         t = p->intr_host;
 909
 910         /* reset chip set */
 911         sc->regs->IMR = EXT;
 912         sc->regs->CR  = 0;
 913         sc->regs->SR  = 0xff;
 914         DELAY(2);
 915         sc->regs->CR = XRST;
 916         if (cfg.crc16)
 917                 sc->regs->CR |= CMOD;
 918         if (cfg.fill_7e)
 919                 sc->regs->CR |= FMOD;
 920         if (cfg.inv)
 921                 sc->regs->CR |= PMOD;
 922
 923         sc->regs->CRB |= RODD | RXDE;
 924         if (cfg.rburst)
 925                 sc->regs->CRB |= RDBE;
 926         if (cfg.wburst)
 927                 sc->regs->CRB |= WTBE;
 928
 929         tsleep(sc, 0, "sbsh", 0);
 930         if ((p->out_ack & 0x1f) != _ACK_BOOT_WAKE_UP)
 931                 return (-1);
 932
 933         if (download_firmware(sc, cfg.firmw_image, cfg.firmw_len))
 934                 return (-1);
 935
 936         tsleep(sc, 0, "sbsh", 0);
 937         if ((p->out_ack & 0x1f) != _ACK_OPER_WAKE_UP)
 938                 return (-1);
 939
 940         t = cfg.master ? 1 : 9;
 941         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_ENABLE, &t, 1))
 942                 return (-1);
 943
 944         t = 0x63;
 945         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_CONFIG, &t, 1))
 946                 return (-1);
 947
 948         *(u_int16_t *)parm = cfg.lrate >> 3;
 949         parm[2] = parm[3] = parm[0];
 950         parm[5] = cfg.lrate & 7;
 951         parm[4] = parm[7] = 1;
 952         parm[6] = 0;
 953         if (issue_cx28975_cmd(sc, _DSL_MULTI_RATE_CONFIG, parm, 8))
 954                 return (-1);
 955
 956         parm[0] = 0x02 | (cfg.mod << 4);
 957         parm[1] = 0;
 958         if (issue_cx28975_cmd(sc, _DSL_TRAINING_MODE, parm, 2))
 959                 return (-1);
 960
 961         bzero(parm, 12);
 962         parm[0] = 0x04;         /* pre-activation: G.hs */
 963         parm[4] = 0x04;         /* no remote configuration */
 964         parm[7] = 0x01;         /* annex A (default) */
 965         parm[8] = 0xff;         /* i-bit mask (all bits) */
 966         if (issue_cx28975_cmd(sc, _DSL_PREACTIVATION_CFG, parm, 12))
 967                 return (-1);
 968
 969         parm[0] = 0x03;         /* dying gasp time - 3 frames */
 970         parm[1] = thresh[cfg.mod];
 971         parm[2] = 0xff;         /* attenuation */
 972         parm[3] = 0x04;         /* line probe NMR (+2 dB) */
 973         parm[4] = 0x00;         /* reserved */
 974         parm[5] = 0x00;
 975         if (issue_cx28975_cmd(sc, _DSL_THRESHOLDS, parm, 6))
 976                 return (-1);
 977
 978         t = cfg.master ? 0x23 : 0x21;
 979         if (issue_cx28975_cmd(sc, _DSL_FR_PCM_CONFIG, &t, 1))
 980                 return (-1);
 981
 982         t = 0x02;
 983         if (issue_cx28975_cmd(sc, _DSL_INTR_HOST_MASK, &t, 1))
 984                 return (-1);
 985
 986         sc->state = DOWN;
 987         return (0);
 988 }
 989
 990 static int
 991 download_firmware(struct sbsh_softc *sc, u_int8_t *img, u_int32_t img_len)
 992 {
 993         u_int32_t       t;
 994         int             i;
 995         u_int8_t        cksum = 0;
 996
 997         for (i = 0; i < img_len; ++i)
 998                 cksum += img[i];
 999
1000         t = img_len;
1001         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_START, (u_int8_t *) &t, 4))
1002                 return (-1);
1003
1004         for (i = 0; img_len >= 75; i += 75, img_len -= 75) {
1005                 if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, 75))
1006                         return (-1);
1007         }
1008
1009         if (img_len
1010             &&  issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, img_len))
1011                 return (-1);
1012
1013         t = (cksum ^ 0xff) + 1;
1014         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_END, (u_int8_t *) &t, 1))
1015                 return (-1);
1016
1017         return (0);
1018 }
1019
1020 static int
1021 issue_cx28975_cmd(struct sbsh_softc *sc, u_int8_t cmd,
1022                         u_int8_t *data, u_int8_t size)
1023 {
1024         volatile struct cx28975_cmdarea  *p = sc->cmdp;
1025         u_int8_t  *databuf = p->in_data;
1026         int  i;
1027
1028         u_int8_t  cksum = 0;
1029
1030         p->in_dest      = 0xf0;
1031         p->in_opcode    = cmd;
1032         p->in_zero      = 0;
1033         p->in_length    = --size;
1034         p->in_csum      = 0xf0 ^ cmd ^ size ^ 0xaa;
1035
1036         for (i = 0; i <= size; ++i) {
1037                 cksum ^= *data;
1038                 *databuf++ = *data++;   /* only 1 byte per cycle! */
1039         }
1040
1041         p->in_datasum   = cksum ^ 0xaa;
1042         p->out_ack      = _ACK_NOT_COMPLETE;
1043         p->intr_8051    = 0xfe;
1044
1045         if (tsleep(sc, 0, "sbsh", hz << 3))
1046                 return (-1);
1047
1048         while (p->out_ack == _ACK_NOT_COMPLETE)
1049                 ;                                       /* FIXME ! */
1050
1051         if ((p->out_ack & 0x1f) == _ACK_PASS) {
1052                 p->out_ack = 0;
1053                 return (0);
1054         } else {
1055                 p->out_ack = 0;
1056                 return (-1);
1057         }
1058 }