sys/dev/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
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  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/module.h>
  37 #include <sys/proc.h>
  38 #include <sys/socket.h>
  39 #include <sys/random.h>
  40 #include <machine/clock.h>
  41 #include <machine/stdarg.h>
  42
  43 #include <net/if.h>
  44 #include <net/if_arp.h>
  45 #include <net/ethernet.h>
  46 #include <net/if_media.h>
  47 #include <net/if_types.h>
  48
  49 #include <net/bpf.h>
  50
  51 #include <vm/vm.h>
  52 #include <vm/pmap.h>
  53 #include <machine/bus.h>
  54 #include <machine/resource.h>
  55 #include <sys/bus.h>
  56 #include <sys/rman.h>
  57
  58 #include <dev/pci/pcireg.h>
  59 #include <dev/pci/pcivar.h>
  60
  61 #include <dev/sbsh/if_sbshreg.h>
  62
  63 /* -------------------------------------------------------------------------- */
  64
  65 struct sbni16_hw_regs {
  66         u_int8_t  CR, CRB, SR, IMR, CTDR, LTDR, CRDR, LRDR;
  67 };
  68
  69 struct hw_descr {
  70         u_int32_t  address;
  71         u_int32_t  length;
  72 };
  73
  74 struct cx28975_cmdarea {
  75         u_int8_t  intr_host;
  76         u_int8_t  intr_8051;
  77         u_int8_t  map_version;
  78
  79         u_int8_t  in_dest;
  80         u_int8_t  in_opcode;
  81         u_int8_t  in_zero;
  82         u_int8_t  in_length;
  83         u_int8_t  in_csum;
  84         u_int8_t  in_data[75];
  85         u_int8_t  in_datasum;
  86
  87         u_int8_t  out_dest;
  88         u_int8_t  out_opcode;
  89         u_int8_t  out_ack;
  90         u_int8_t  out_length;
  91         u_int8_t  out_csum;
  92         u_int8_t  out_data[75];
  93         u_int8_t  out_datasum;
  94 };
  95
  96 #define XQLEN   8
  97 #define RQLEN   8
  98
  99 struct sbsh_softc {
 100         struct ifnet    *ifp;
 101
 102         struct resource *mem_res;
 103         struct resource *irq_res;
 104         void            *intr_hand;
 105
 106         void            *mem_base;              /* mapped memory address */
 107
 108         volatile struct sbni16_hw_regs  *regs;
 109         volatile struct hw_descr        *tbd;
 110         volatile struct hw_descr        *rbd;
 111         volatile struct cx28975_cmdarea *cmdp;
 112
 113         /* SBNI16 controller statistics */
 114         struct sbni16_stats {
 115                 u_int32_t  sent_pkts, rcvd_pkts;
 116                 u_int32_t  crc_errs, ufl_errs, ofl_errs, attempts, last_time;
 117         } in_stats;
 118
 119         /* transmit and reception queues */
 120         struct mbuf     *xq[XQLEN], *rq[RQLEN];
 121         unsigned        head_xq, tail_xq, head_rq, tail_rq;
 122
 123         /* the descriptors mapped onto the first buffers in xq and rq */
 124         unsigned        head_tdesc, head_rdesc;
 125         u_int8_t        state;
 126 };
 127
 128 struct cx28975_cfg {
 129         u_int8_t   *firmw_image;
 130         u_int32_t  firmw_len;
 131         u_int32_t  lrate: 10;
 132         u_int32_t  master: 1;
 133         u_int32_t  mod: 2;
 134         u_int32_t  crc16: 1;
 135         u_int32_t  fill_7e: 1;
 136         u_int32_t  inv: 1;
 137         u_int32_t  rburst: 1;
 138         u_int32_t  wburst: 1;
 139         u_int32_t  : 14;
 140 };
 141
 142 /* SHDSL transceiver statistics */
 143 struct dsl_stats {
 144         u_int8_t        status_1, status_3;
 145         u_int8_t        attenuat, nmr, tpbo, rpbo;
 146         u_int16_t       losw, segd, crc, sega, losd;
 147 };
 148
 149 enum State { NOT_LOADED, DOWN, ACTIVATION, ACTIVE };
 150
 151 #define SIOCLOADFIRMW   _IOWR('i', 67, struct ifreq)
 152 #define SIOCGETSTATS    _IOWR('i', 68, struct ifreq)
 153 #define SIOCCLRSTATS    _IOWR('i', 69, struct ifreq)
 154
 155 static int      sbsh_probe(device_t);
 156 static int      sbsh_attach(device_t);
 157 static int      sbsh_detach(device_t);
 158 static int      sbsh_ioctl(struct ifnet *, u_long, caddr_t);
 159 static void     sbsh_shutdown(device_t);
 160 static int      sbsh_suspend(device_t);
 161 static int      sbsh_resume(device_t);
 162 static void     sbsh_watchdog(struct ifnet *);
 163
 164 static void     sbsh_start(struct ifnet *);
 165 static void     sbsh_init(void *);
 166 static void     sbsh_stop(struct sbsh_softc *);
 167 static void     init_card(struct sbsh_softc *);
 168 static void     sbsh_intr(void *);
 169 static void     resume_tx(struct sbsh_softc *);
 170 static void     start_xmit_frames(struct sbsh_softc *);
 171 static void     encap_frame(struct sbsh_softc *, struct mbuf *);
 172 static struct mbuf *    repack(struct sbsh_softc *, struct mbuf *);
 173 static void     free_sent_buffers(struct sbsh_softc *);
 174 static void     alloc_rx_buffers(struct sbsh_softc *);
 175 static void     indicate_frames(struct sbsh_softc *);
 176 static void     drop_queues(struct sbsh_softc *);
 177 static void     activate(struct sbsh_softc *);
 178 static void     deactivate(struct sbsh_softc *);
 179 static void     cx28975_interrupt(struct sbsh_softc *);
 180 static int      start_cx28975(struct sbsh_softc *, struct cx28975_cfg);
 181 static int      download_firmware(struct sbsh_softc *, u_int8_t *, u_int32_t);
 182 static int      issue_cx28975_cmd(struct sbsh_softc *, u_int8_t,
 183                                         u_int8_t *, u_int8_t);
 184
 185 static device_method_t sbsh_methods[] = {
 186         /* Device interface */
 187         DEVMETHOD(device_probe,         sbsh_probe),
 188         DEVMETHOD(device_attach,        sbsh_attach),
 189         DEVMETHOD(device_detach,        sbsh_detach),
 190         DEVMETHOD(device_shutdown,      sbsh_shutdown),
 191         DEVMETHOD(device_suspend,       sbsh_suspend),
 192         DEVMETHOD(device_resume,        sbsh_resume),
 193
 194         { 0, 0 }
 195 };
 196
 197 static driver_t sbsh_driver = {
 198         "sbsh",
 199         sbsh_methods,
 200         sizeof(struct sbsh_softc)
 201 };
 202
 203 static devclass_t sbsh_devclass;
 204
 205 DRIVER_MODULE(sbsh, pci, sbsh_driver, sbsh_devclass, 0, 0);
 206 MODULE_DEPEND(sbsh, pci, 1, 1, 1);
 207
 208 static int
 209 sbsh_probe(device_t dev)
 210 {
 211         if (pci_get_vendor(dev) != SBNI16_VENDOR
 212             || pci_get_device(dev) != SBNI16_DEVICE
 213             || pci_get_subdevice(dev) != SBNI16_SUBDEV)
 214                 return (ENXIO);
 215
 216         device_set_desc(dev, "Granch SBNI16 G.SHDSL Modem");
 217         return (BUS_PROBE_DEFAULT);
 218 }
 219
 220 static int
 221 sbsh_attach(device_t dev)
 222 {
 223         struct sbsh_softc       *sc;
 224         struct ifnet            *ifp;
 225         int                     unit, error = 0, rid, s;
 226         u_char                  eaddr[6];
 227
 228         s = splimp();
 229
 230         sc = device_get_softc(dev);
 231         unit = device_get_unit(dev);
 232
 233         rid = PCIR_BAR(1);
 234         sc->mem_res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
 235                                         0, ~0, 4096, RF_ACTIVE);
 236
 237         if (sc->mem_res == NULL) {
 238                 printf ("sbsh%d: couldn't map memory\n", unit);
 239                 error = ENXIO;
 240                 goto fail;
 241         }
 242
 243         rid = 0;
 244         sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
 245                                                 RF_SHAREABLE | RF_ACTIVE);
 246
 247         if (sc->irq_res == NULL) {
 248                 printf("sbsh%d: couldn't map interrupt\n", unit);
 249                 bus_release_resource(dev, SYS_RES_MEMORY,
 250                                         PCIR_BAR(1), sc->mem_res);
 251                 error = ENXIO;
 252                 goto fail;
 253         }
 254
 255         sc->mem_base = rman_get_virtual(sc->mem_res);
 256         init_card(sc);
 257
 258         error = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_NET,
 259                                 sbsh_intr, sc, &sc->intr_hand);
 260         if (error) {
 261                 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
 262                 bus_release_resource(dev, SYS_RES_MEMORY,
 263                                         PCIR_BAR(1), sc->mem_res);
 264                 printf("sbsh%d: couldn't set up irq\n", unit);
 265                 goto fail;
 266         }
 267
 268         /* generate ethernet MAC address */
 269         *(u_int32_t *)eaddr = htonl(0x00ff0192);
 270         read_random(eaddr + 4, 2);
 271
 272         ifp = sc->ifp = if_alloc(IFT_ETHER);
 273         if (ifp == NULL) {
 274                 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
 275                 bus_release_resource(dev, SYS_RES_MEMORY,
 276                                         PCIR_BAR(1), sc->mem_res);
 277                 bus_teardown_intr(dev, sc->irq_res, sc->intr_hand);
 278                 printf("sbsh%d: can not if_alloc()\n", unit);
 279                 goto fail;
 280         }
 281         ifp->if_softc = sc;
 282         if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 283         ifp->if_mtu = ETHERMTU;
 284         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST |
 285             IFF_NEEDSGIANT;
 286         ifp->if_ioctl = sbsh_ioctl;
 287         ifp->if_start = sbsh_start;
 288         ifp->if_watchdog = sbsh_watchdog;
 289         ifp->if_init = sbsh_init;
 290         ifp->if_baudrate = 4600000;
 291         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 292
 293         ether_ifattach(ifp, eaddr);
 294
 295 fail:
 296         splx(s);
 297         return (error);
 298 }
 299
 300 static int
 301 sbsh_detach(device_t dev)
 302 {
 303         struct sbsh_softc       *sc;
 304         struct ifnet            *ifp;
 305         int                     s;
 306
 307         s = splimp();
 308
 309         sc = device_get_softc(dev);
 310         ifp = sc->ifp;
 311
 312         sbsh_stop(sc);
 313         ether_ifdetach(ifp);
 314         if_free(ifp);
 315
 316         bus_teardown_intr(dev, sc->irq_res, sc->intr_hand);
 317         bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
 318         bus_release_resource(dev, SYS_RES_MEMORY, PCIR_BAR(1), sc->mem_res);
 319
 320         splx(s);
 321         return (0);
 322 }
 323
 324
 325 static void
 326 sbsh_start(struct ifnet *ifp)
 327 {
 328         struct sbsh_softc  *sc = ifp->if_softc;
 329         int  s;
 330
 331         if (sc->state != ACTIVE)
 332                 return;
 333
 334         s = splimp();
 335         start_xmit_frames(ifp->if_softc);
 336         splx(s);
 337 }
 338
 339
 340 static void
 341 sbsh_init(void *xsc)
 342 {
 343         struct sbsh_softc       *sc = xsc;
 344         struct ifnet            *ifp = sc->ifp;
 345         int                     s;
 346         u_int8_t                t;
 347
 348         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) || sc->state == NOT_LOADED)
 349                 return;
 350
 351         s = splimp();
 352
 353         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 354         sc->head_xq = sc->tail_xq = sc->head_rq = sc->tail_rq = 0;
 355         sc->head_tdesc = sc->head_rdesc = 0;
 356
 357         sc->regs->IMR = EXT;
 358         t = 2;
 359         issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1);
 360         if (issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1) == 0) {
 361                 sc->state = ACTIVATION;
 362
 363                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 364                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
 365         }
 366
 367         splx(s);
 368 }
 369
 370
 371 static void
 372 sbsh_stop(struct sbsh_softc *sc)
 373 {
 374         int  s;
 375         u_int8_t  t;
 376
 377         s = splimp();
 378         sc->regs->IMR = EXT;
 379
 380         t = 0;
 381         issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1);
 382         if (sc->state == ACTIVE) {
 383                 t = 1;
 384                 issue_cx28975_cmd(sc, _DSL_FORCE_DEACTIVATE, &t, 1);
 385                 /* FIX! activation manager state */
 386
 387                 /* Is it really must be done here? It calls from intr handler */
 388                 deactivate(sc);
 389         }
 390
 391         sc->regs->IMR = 0;
 392         sc->state = DOWN;
 393         splx(s);
 394 }
 395
 396
 397 static void
 398 init_card(struct sbsh_softc *sc)
 399 {
 400         sc->state = NOT_LOADED;
 401         sc->tbd  = (struct hw_descr *) sc->mem_base;
 402         sc->rbd  = (struct hw_descr *) ((u_int8_t *)sc->mem_base + 0x400);
 403         sc->regs = (struct sbni16_hw_regs *) ((u_int8_t *)sc->mem_base + 0x800);
 404         sc->cmdp = (struct cx28975_cmdarea *) ((u_int8_t *)sc->mem_base + 0xc00);
 405
 406         sc->regs->CR = 0;
 407         sc->regs->SR = 0xff;
 408         sc->regs->IMR = 0;
 409 }
 410
 411
 412 static int
 413 sbsh_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 414 {
 415         struct sbsh_softc       *sc = ifp->if_softc;
 416         struct ifreq            *ifr = (struct ifreq *) data;
 417         struct cx28975_cfg      cfg;
 418         struct dsl_stats        ds;
 419
 420         int                     s, error = 0;
 421         u_int8_t                t;
 422
 423         s = splimp();
 424
 425         switch(cmd) {
 426         case SIOCLOADFIRMW:
 427                 if ((error = suser(curthread)) != 0)
 428                         break;
 429                 if (ifp->if_flags & IFF_UP)
 430                         error = EBUSY;
 431
 432                 bcopy((caddr_t)ifr->ifr_data, (caddr_t)&cfg, sizeof cfg);
 433                 if (start_cx28975(sc, cfg) == 0) {
 434                         static char  *modstr[] = {
 435                                 "TCPAM32", "TCPAM16", "TCPAM8", "TCPAM4" };
 436                         if_printf(sc->ifp, "%s, rate %d, %s\n",
 437                                 cfg.master ? "master" : "slave",
 438                                 cfg.lrate << 3, modstr[cfg.mod]);
 439                 } else {
 440                         if_printf(sc->ifp,
 441                                 "unable to load firmware\n");
 442                         error = EIO;
 443                 }
 444                 break;
 445
 446         case  SIOCGETSTATS :
 447                 if ((error = suser(curthread)) != 0)
 448                         break;
 449
 450                 t = 0;
 451                 if (issue_cx28975_cmd(sc, _DSL_FAR_END_ATTEN, &t, 1))
 452                         error = EIO;
 453                 ds.attenuat = sc->cmdp->out_data[0];
 454
 455                 if (issue_cx28975_cmd(sc, _DSL_NOISE_MARGIN, &t, 1))
 456                         error = EIO;
 457                 ds.nmr = sc->cmdp->out_data[0];
 458
 459                 if (issue_cx28975_cmd(sc, _DSL_POWER_BACK_OFF_RESULT, &t, 1))
 460                         error = EIO;
 461                 ds.tpbo = sc->cmdp->out_data[0];
 462                 ds.rpbo = sc->cmdp->out_data[1];
 463
 464                 if (!issue_cx28975_cmd(sc, _DSL_HDSL_PERF_ERR_CTRS, &t, 1)) {
 465                         int i;
 466                         for (i = 0; i < 10; ++i)
 467                                 ((u_int8_t *) &ds.losw)[i] =
 468                                         sc->cmdp->out_data[i];
 469                 } else
 470                         error = EIO;
 471
 472                 ds.status_1 = ((volatile u_int8_t *)sc->cmdp)[0x3c0];
 473                 ds.status_3 = ((volatile u_int8_t *)sc->cmdp)[0x3c2];
 474
 475                 bcopy(&sc->in_stats, ifr->ifr_data, sizeof(struct sbni16_stats));
 476                 bcopy(&ds, ifr->ifr_data + sizeof(struct sbni16_stats),
 477                     sizeof(struct dsl_stats));
 478                 break;
 479
 480         case  SIOCCLRSTATS :
 481                 if (!(error = suser(curthread))) {
 482                         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 483                         t = 2;
 484                         if (issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1))
 485                                 error = EIO;
 486                 }
 487                 break;
 488
 489         case SIOCSIFFLAGS:
 490                 if (ifp->if_flags & IFF_UP) {
 491                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 492                                 if (sc->state == NOT_LOADED) {
 493                                         if_printf(ifp, "firmware wasn't loaded\n");
 494                                         error = EBUSY;
 495                                 } else
 496                                         sbsh_init(sc);
 497                         }
 498                 } else {
 499                         if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
 500                                 sbsh_stop(sc);
 501                                 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 502                         }
 503                 }
 504                 break;
 505
 506         case SIOCADDMULTI:
 507         case SIOCDELMULTI:
 508                 error = 0;
 509                 break;
 510
 511         default:
 512                 error = ether_ioctl(ifp, cmd, data);
 513                 break;
 514         }
 515
 516         splx(s);
 517         return (error);
 518 }
 519
 520
 521 static void
 522 sbsh_shutdown(device_t dev)
 523 {
 524         struct sbsh_softc       *sc = device_get_softc(dev);
 525
 526         sbsh_stop(sc);
 527 }
 528
 529 static int
 530 sbsh_suspend(device_t dev)
 531 {
 532         struct sbsh_softc       *sc = device_get_softc(dev);
 533         int                     s;
 534
 535         s = splimp();
 536         sbsh_stop(sc);
 537         splx(s);
 538
 539         return (0);
 540 }
 541
 542 static int
 543 sbsh_resume(device_t dev)
 544 {
 545         struct sbsh_softc       *sc = device_get_softc(dev);
 546         struct ifnet            *ifp;
 547         int                     s;
 548
 549         s = splimp();
 550         ifp = sc->ifp;
 551
 552         if (ifp->if_flags & IFF_UP)
 553                 sbsh_init(sc);
 554
 555         splx(s);
 556         return (0);
 557 }
 558
 559
 560 static void
 561 sbsh_watchdog(struct ifnet *ifp)
 562 {
 563         struct sbsh_softc       *sc = ifp->if_softc;
 564
 565         if_printf(ifp, "transmit timeout\n");
 566
 567         if (sc->regs->SR & TXS) {
 568                 sc->regs->SR = TXS;
 569                 if_printf(ifp, "interrupt posted but not delivered\n");
 570         }
 571         free_sent_buffers(sc);
 572 }
 573
 574 /* -------------------------------------------------------------------------- */
 575
 576 static void
 577 sbsh_intr(void *arg)
 578 {
 579         struct sbsh_softc  *sc = (struct sbsh_softc *)arg;
 580         u_int8_t  status = sc->regs->SR;
 581
 582         if (status == 0)
 583                 return;
 584
 585         if (status & EXT) {
 586                 cx28975_interrupt(sc);
 587                 sc->regs->SR = EXT;
 588         }
 589
 590         if (status & UFL) {
 591                 resume_tx(sc);
 592                 sc->regs->SR = UFL;
 593                 ++sc->in_stats.ufl_errs;
 594                 ++sc->ifp->if_oerrors;
 595         }
 596
 597         if (status & RXS) {
 598                 sc->regs->SR = RXS;
 599                 indicate_frames(sc);
 600                 alloc_rx_buffers(sc);
 601         }
 602
 603         if (status & TXS) {
 604                 sc->regs->SR = TXS;
 605                 free_sent_buffers(sc);
 606         }
 607
 608         if (status & CRC) {
 609                 ++sc->in_stats.crc_errs;
 610                 ++sc->ifp->if_ierrors;
 611                 sc->regs->SR = CRC;
 612         }
 613
 614         if (status & OFL) {
 615                 ++sc->in_stats.ofl_errs;
 616                 ++sc->ifp->if_ierrors;
 617                 sc->regs->SR = OFL;
 618         }
 619 }
 620
 621 /*
 622  * Look for a first descriptor of a next packet, and write it's number
 623  * into CTDR. Then enable the transmitter.
 624  */
 625 static void
 626 resume_tx(struct sbsh_softc *sc)
 627 {
 628         u_int32_t       cur_tbd = sc->regs->CTDR;
 629
 630         while (cur_tbd != sc->regs->LTDR
 631                 && (sc->tbd[cur_tbd++].length & LAST_FRAG) == 0)
 632                 ;
 633         sc->regs->CTDR = cur_tbd;
 634         sc->regs->CR |= TXEN;
 635 }
 636
 637 static void
 638 start_xmit_frames(struct sbsh_softc *sc)
 639 {
 640         struct ifnet    *ifp = sc->ifp;
 641         struct mbuf     *m;
 642
 643         /*
 644          * Check if we have any free descriptor(s) and free space in
 645          * our transmit queue.
 646          */
 647         while (sc->tail_xq != ((sc->head_xq - 1) & (XQLEN - 1))
 648             && sc->regs->LTDR != ((sc->head_tdesc - 1) & 0x7f)) {
 649
 650                 IF_DEQUEUE(&ifp->if_snd, m);
 651                 if (!m)
 652                         break;
 653                 if (m->m_pkthdr.len) {
 654                         BPF_MTAP(ifp, m);
 655                         encap_frame(sc, m);
 656                 } else
 657                         m_freem(m);
 658         }
 659
 660         if (sc->regs->CTDR != sc->regs->LTDR)
 661                 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
 662         else
 663                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
 664 }
 665
 666
 667 /*
 668  * MUST be called at splimp
 669  */
 670 static void
 671 encap_frame(struct sbsh_softc *sc, struct mbuf *m_head)
 672 {
 673         struct mbuf     *m;
 674         u_int32_t       cur_tbd;
 675         int  done;
 676
 677 look_for_nonzero:
 678         for (m = m_head; !m->m_len; m = m->m_next)
 679                 ;
 680
 681         cur_tbd = sc->regs->LTDR & 0x7f;
 682         done = 0;
 683         do {
 684                 if (m->m_len < 5 || cur_tbd == ((sc->head_tdesc - 1) & 0x7f)) {
 685                         if ((m_head = repack(sc, m_head)) != NULL)
 686                                 goto look_for_nonzero;
 687                         else
 688                                 return;
 689                 }
 690
 691                 sc->tbd[cur_tbd].address = vtophys(mtod(m, vm_offset_t));
 692                 sc->tbd[cur_tbd].length  = m->m_len;
 693
 694                 do {
 695                         m = m->m_next;
 696                 } while (m && !m->m_len);
 697
 698                 if (!m) {       /* last fragment has been reached */
 699                         sc->tbd[cur_tbd].length |= LAST_FRAG;
 700                         done = 1;
 701                 }
 702
 703                 ++cur_tbd;
 704                 cur_tbd &= 0x7f;
 705         } while (!done);
 706
 707         sc->xq[sc->tail_xq++] = m_head;
 708         sc->tail_xq &= (XQLEN - 1);
 709
 710         sc->regs->LTDR = cur_tbd;
 711         ++sc->in_stats.sent_pkts;
 712         ++sc->ifp->if_opackets;
 713 }
 714
 715 static struct mbuf *
 716 repack(struct sbsh_softc *sc, struct mbuf *m)
 717 {
 718         struct mbuf  *m_new;
 719
 720         MGETHDR(m_new, M_DONTWAIT, MT_DATA);
 721         if (!m_new) {
 722                 if_printf (sc->ifp,
 723                            "unable to get mbuf.\n");
 724                 return (NULL);
 725         }
 726
 727         if (m->m_pkthdr.len > MHLEN) {
 728                 MCLGET(m_new, M_DONTWAIT);
 729                 if (!(m_new->m_flags & M_EXT)) {
 730                         m_freem(m_new);
 731                         if_printf (sc->ifp,
 732                                    "unable to get mbuf cluster.\n");
 733                         return (NULL);
 734                 }
 735         }
 736
 737         m_copydata(m, 0, m->m_pkthdr.len, mtod(m_new, caddr_t));
 738         m_new->m_pkthdr.len = m_new->m_len = m->m_pkthdr.len;
 739         m_freem(m);
 740         return (m_new);
 741 }
 742
 743 static void
 744 free_sent_buffers(struct sbsh_softc *sc)
 745 {
 746         u_int32_t  cur_tbd;
 747
 748         cur_tbd = sc->regs->CTDR;
 749
 750         while (sc->head_tdesc != cur_tbd) {
 751                 /*
 752                  * Be careful! one element in xq may correspond to
 753                  * multiple descriptors.
 754                  */
 755                 if (sc->tbd[sc->head_tdesc].length & LAST_FRAG) {
 756                         m_freem(sc->xq[sc->head_xq++]);
 757                         sc->head_xq &= (XQLEN - 1);
 758                 }
 759
 760                 sc->tbd[sc->head_tdesc].length = 0;
 761                 sc->head_tdesc = (sc->head_tdesc + 1) & 0x7f;
 762         }
 763
 764         start_xmit_frames(sc);
 765 }
 766
 767 /*
 768  * DON'T use free_sent_buffers to drop the queue!
 769  */
 770 static void
 771 alloc_rx_buffers(struct sbsh_softc *sc)
 772 {
 773         unsigned        cur_rbd = sc->regs->LRDR & 0x7f;
 774         struct mbuf     *m;
 775
 776         while (sc->tail_rq != ((sc->head_rq - 1) & (RQLEN - 1))) {
 777                 MGETHDR(m, M_DONTWAIT, MT_DATA);
 778                 if (!m) {
 779                         if_printf (sc->ifp,
 780                                    "unable to get mbuf.\n");
 781                         return;
 782                 }
 783
 784                 if (SBNI16_MAX_FRAME > MHLEN) {
 785                         MCLGET(m, M_DONTWAIT);
 786                         if (!(m->m_flags & M_EXT)) {
 787                                 m_freem(m);
 788                                 if_printf (sc->ifp,
 789                                            "unable to get mbuf cluster.\n");
 790                                 return;
 791                         }
 792                         m->m_pkthdr.len = m->m_len = MCLBYTES;
 793                 }
 794
 795                 m_adj(m, 2);    /* align ip on longword boundaries */
 796
 797                 sc->rq[sc->tail_rq++] = m;
 798                 sc->tail_rq &= (RQLEN - 1);
 799
 800                 sc->rbd[cur_rbd].address = vtophys(mtod(m, vm_offset_t));
 801                 sc->rbd[cur_rbd].length  = 0;
 802                 sc->regs->LRDR = cur_rbd = (cur_rbd + 1) & 0x7f;
 803         }
 804 }
 805
 806 static void
 807 indicate_frames(struct sbsh_softc *sc)
 808 {
 809         unsigned  cur_rbd = sc->regs->CRDR & 0x7f;
 810
 811         while (sc->head_rdesc != cur_rbd) {
 812                 struct mbuf  *m = sc->rq[sc->head_rq++];
 813                 sc->head_rq &= (RQLEN - 1);
 814
 815                 m->m_pkthdr.len = m->m_len =
 816                                 sc->rbd[sc->head_rdesc].length & 0x7ff;
 817                 m->m_pkthdr.rcvif = sc->ifp;
 818
 819                 (*sc->ifp->if_input)(sc->ifp, m);
 820                 ++sc->in_stats.rcvd_pkts;
 821                 ++sc->ifp->if_ipackets;
 822
 823                 sc->head_rdesc = (sc->head_rdesc + 1) & 0x7f;
 824         }
 825 }
 826
 827 static void
 828 drop_queues(struct sbsh_softc *sc)
 829 {
 830         while (sc->head_rq != sc->tail_rq) {
 831                 m_freem(sc->rq[sc->head_rq++]);
 832                 sc->head_rq &= (RQLEN - 1);
 833         }
 834
 835         while (sc->head_xq != sc->tail_xq) {
 836                 m_freem(sc->xq[sc->head_xq++]);
 837                 sc->head_xq &= (XQLEN - 1);
 838         }
 839 }
 840
 841 /* -------------------------------------------------------------------------- */
 842
 843 static void
 844 activate(struct sbsh_softc *sc)
 845 {
 846         struct timeval  tv;
 847
 848         sc->regs->SR   = 0xff;          /* clear it! */
 849         sc->regs->CTDR = sc->regs->LTDR = sc->regs->CRDR = sc->regs->LRDR = 0;
 850
 851         sc->head_tdesc = sc->head_rdesc = 0;
 852         alloc_rx_buffers(sc);
 853
 854         sc->regs->CRB &= ~RXDE;
 855         sc->regs->IMR = EXT | RXS | TXS | CRC | OFL | UFL;
 856         sc->regs->CR |= TXEN | RXEN;
 857
 858         sc->state = ACTIVE;
 859         ++sc->in_stats.attempts;
 860         microtime(&tv);
 861         sc->in_stats.last_time = tv.tv_sec;
 862         start_xmit_frames(sc);
 863 }
 864
 865 static void
 866 deactivate(struct sbsh_softc *sc)
 867 {
 868         sc->regs->CR &= ~(RXEN | TXEN);
 869         sc->regs->CRB |= RXDE;
 870         sc->regs->IMR  = EXT;
 871         sc->regs->CTDR = sc->regs->LTDR;
 872         sc->regs->CRDR = sc->regs->LRDR;
 873         sc->state = ACTIVATION;
 874
 875         drop_queues(sc);
 876 }
 877
 878 /* -------------------------------------------------------------------------- */
 879
 880 static void
 881 cx28975_interrupt(struct sbsh_softc *sc)
 882 {
 883         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 884         u_int8_t  t;
 885
 886         if (p->intr_host != 0xfe)
 887                 return;
 888
 889         if (p->out_ack & 0x80) {
 890                 if (*((volatile u_int8_t *)p + 0x3c7) & 2) {
 891                         if (sc->state != ACTIVE
 892                             && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) == 0x40) {
 893                                 activate(sc);
 894                                 if_printf(sc->ifp, "connected to peer\n");
 895                         } else if (sc->state == ACTIVE
 896                                  && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) != 0x40) {
 897                                 deactivate(sc);
 898                                 if_printf(sc->ifp, "carrier lost\n");
 899                         }
 900                 }
 901
 902                 p->intr_host = 0;
 903                 t = p->intr_host;
 904                 p->out_ack = 0;
 905         } else {
 906                 wakeup(sc);
 907
 908                 p->intr_host = 0;
 909                 t = p->intr_host;
 910         }
 911 }
 912
 913 /* -------------------------------------------------------------------------- */
 914
 915 static int
 916 start_cx28975(struct sbsh_softc *sc, struct cx28975_cfg cfg)
 917 {
 918         static char  thresh[] = { +8, -4, -16, -40 };
 919
 920         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 921         u_int8_t  t, parm[12];
 922
 923         p->intr_host = 0;
 924         t = p->intr_host;
 925
 926         /* reset chip set */
 927         sc->regs->IMR = EXT;
 928         sc->regs->CR  = 0;
 929         sc->regs->SR  = 0xff;
 930         DELAY(2);
 931         sc->regs->CR = XRST;
 932         if (cfg.crc16)
 933                 sc->regs->CR |= CMOD;
 934         if (cfg.fill_7e)
 935                 sc->regs->CR |= FMOD;
 936         if (cfg.inv)
 937                 sc->regs->CR |= PMOD;
 938
 939         sc->regs->CRB |= RODD | RXDE;
 940         if (cfg.rburst)
 941                 sc->regs->CRB |= RDBE;
 942         if (cfg.wburst)
 943                 sc->regs->CRB |= WTBE;
 944
 945         tsleep(sc, PWAIT, "sbsh", 0);
 946         if ((p->out_ack & 0x1f) != _ACK_BOOT_WAKE_UP)
 947                 return (-1);
 948
 949         if (download_firmware(sc, cfg.firmw_image, cfg.firmw_len))
 950                 return (-1);
 951
 952         tsleep(sc, PWAIT, "sbsh", 0);
 953         if ((p->out_ack & 0x1f) != _ACK_OPER_WAKE_UP)
 954                 return (-1);
 955
 956         t = cfg.master ? 1 : 9;
 957         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_ENABLE, &t, 1))
 958                 return (-1);
 959
 960         t = 0x63;
 961         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_CONFIG, &t, 1))
 962                 return (-1);
 963
 964         *(u_int16_t *)parm = cfg.lrate >> 3;
 965         parm[2] = parm[3] = parm[0];
 966         parm[5] = cfg.lrate & 7;
 967         parm[4] = parm[7] = 1;
 968         parm[6] = 0;
 969         if (issue_cx28975_cmd(sc, _DSL_MULTI_RATE_CONFIG, parm, 8))
 970                 return (-1);
 971
 972         parm[0] = 0x02 | (cfg.mod << 4);
 973         parm[1] = 0;
 974         if (issue_cx28975_cmd(sc, _DSL_TRAINING_MODE, parm, 2))
 975                 return (-1);
 976
 977         bzero(parm, 12);
 978         parm[0] = 0x04;         /* pre-activation: G.hs */
 979         parm[4] = 0x04;         /* no remote configuration */
 980         parm[7] = 0x01;         /* annex A (default) */
 981         parm[8] = 0xff;         /* i-bit mask (all bits) */
 982         if (issue_cx28975_cmd(sc, _DSL_PREACTIVATION_CFG, parm, 12))
 983                 return (-1);
 984
 985         parm[0] = 0x03;         /* dying gasp time - 3 frames */
 986         parm[1] = thresh[cfg.mod];
 987         parm[2] = 0xff;         /* attenuation */
 988         parm[3] = 0x04;         /* line probe NMR (+2 dB) */
 989         parm[4] = 0x00;         /* reserved */
 990         parm[5] = 0x00;
 991         if (issue_cx28975_cmd(sc, _DSL_THRESHOLDS, parm, 6))
 992                 return (-1);
 993
 994         t = cfg.master ? 0x23 : 0x21;
 995         if (issue_cx28975_cmd(sc, _DSL_FR_PCM_CONFIG, &t, 1))
 996                 return (-1);
 997
 998         t = 0x02;
 999         if (issue_cx28975_cmd(sc, _DSL_INTR_HOST_MASK, &t, 1))
1000                 return (-1);
1001
1002         sc->state = DOWN;
1003         return (0);
1004 }
1005
1006 static int
1007 download_firmware(struct sbsh_softc *sc, u_int8_t *img, u_int32_t img_len)
1008 {
1009         u_int32_t       t;
1010         int             i;
1011         u_int8_t        cksum = 0;
1012
1013         for (i = 0; i < img_len; ++i)
1014                 cksum += img[i];
1015
1016         t = img_len;
1017         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_START, (u_int8_t *) &t, 4))
1018                 return (-1);
1019
1020         for (i = 0; img_len >= 75; i += 75, img_len -= 75) {
1021                 if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, 75))
1022                         return (-1);
1023         }
1024
1025         if (img_len
1026             &&  issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, img_len))
1027                 return (-1);
1028
1029         t = (cksum ^ 0xff) + 1;
1030         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_END, (u_int8_t *) &t, 1))
1031                 return (-1);
1032
1033         return (0);
1034 }
1035
1036 static int
1037 issue_cx28975_cmd(struct sbsh_softc *sc, u_int8_t cmd,
1038                         u_int8_t *data, u_int8_t size)
1039 {
1040         volatile struct cx28975_cmdarea  *p = sc->cmdp;
1041         u_int8_t  *databuf = p->in_data;
1042         int  i;
1043
1044         u_int8_t  cksum = 0;
1045
1046         p->in_dest      = 0xf0;
1047         p->in_opcode    = cmd;
1048         p->in_zero      = 0;
1049         p->in_length    = --size;
1050         p->in_csum      = 0xf0 ^ cmd ^ size ^ 0xaa;
1051
1052         for (i = 0; i <= size; ++i) {
1053                 cksum ^= *data;
1054                 *databuf++ = *data++;   /* only 1 byte per cycle! */
1055         }
1056
1057         p->in_datasum   = cksum ^ 0xaa;
1058         p->out_ack      = _ACK_NOT_COMPLETE;
1059         p->intr_8051    = 0xfe;
1060
1061         if (tsleep(sc, PWAIT, "sbsh", hz << 3))
1062                 return (-1);
1063
1064         while (p->out_ack == _ACK_NOT_COMPLETE)
1065                 ;                                       /* FIXME ! */
1066
1067         if ((p->out_ack & 0x1f) == _ACK_PASS) {
1068                 p->out_ack = 0;
1069                 return (0);
1070         } else {
1071                 p->out_ack = 0;
1072                 return (-1);
1073         }
1074 }