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 1.11 2004/06/02 14:42:54 eirikn Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/sockio.h>
  33 #include <sys/mbuf.h>
  34 #include <sys/malloc.h>
  35 #include <sys/kernel.h>
  36 #include <sys/proc.h>
  37 #include <sys/socket.h>
  38 #include <sys/random.h>
  39 #include <machine/clock.h>
  40 #include <machine/stdarg.h>
  41
  42 #include <net/if.h>
  43 #include <net/if_arp.h>
  44 #include <net/ethernet.h>
  45 #include <net/if_media.h>
  46
  47 #include <net/bpf.h>
  48
  49 #include <vm/vm.h>
  50 #include <vm/pmap.h>
  51 #include <machine/bus.h>
  52 #include <machine/resource.h>
  53 #include <sys/bus.h>
  54 #include <sys/rman.h>
  55
  56 #include <bus/pci/pcireg.h>
  57 #include <bus/pci/pcivar.h>
  58
  59 #include "if_sbshreg.h"
  60
  61 /* -------------------------------------------------------------------------- */
  62
  63 struct sbni16_hw_regs {
  64         u_int8_t  CR, CRB, SR, IMR, CTDR, LTDR, CRDR, LRDR;
  65 };
  66
  67 struct hw_descr {
  68         u_int32_t  address;
  69         u_int32_t  length;
  70 };
  71
  72 struct cx28975_cmdarea {
  73         u_int8_t  intr_host;
  74         u_int8_t  intr_8051;
  75         u_int8_t  map_version;
  76
  77         u_int8_t  in_dest;
  78         u_int8_t  in_opcode;
  79         u_int8_t  in_zero;
  80         u_int8_t  in_length;
  81         u_int8_t  in_csum;
  82         u_int8_t  in_data[75];
  83         u_int8_t  in_datasum;
  84
  85         u_int8_t  out_dest;
  86         u_int8_t  out_opcode;
  87         u_int8_t  out_ack;
  88         u_int8_t  out_length;
  89         u_int8_t  out_csum;
  90         u_int8_t  out_data[75];
  91         u_int8_t  out_datasum;
  92 };
  93
  94 #define XQLEN   8
  95 #define RQLEN   8
  96
  97 struct sbsh_softc {
  98         struct arpcom   arpcom;         /* ethernet common */
  99
 100         struct resource *mem_res;
 101         struct resource *irq_res;
 102         void            *intr_hand;
 103
 104         void            *mem_base;              /* mapped memory address */
 105
 106         volatile struct sbni16_hw_regs  *regs;
 107         volatile struct hw_descr        *tbd;
 108         volatile struct hw_descr        *rbd;
 109         volatile struct cx28975_cmdarea *cmdp;
 110
 111         /* SBNI16 controller statistics */
 112         struct sbni16_stats {
 113                 u_int32_t  sent_pkts, rcvd_pkts;
 114                 u_int32_t  crc_errs, ufl_errs, ofl_errs, attempts, last_time;
 115         } in_stats;
 116
 117         /* transmit and reception queues */
 118         struct mbuf     *xq[XQLEN], *rq[RQLEN];
 119         unsigned        head_xq, tail_xq, head_rq, tail_rq;
 120
 121         /* the descriptors mapped onto the first buffers in xq and rq */
 122         unsigned        head_tdesc, head_rdesc;
 123         u_int8_t        state;
 124 };
 125
 126 struct cx28975_cfg {
 127         u_int8_t   *firmw_image;
 128         u_int32_t  firmw_len;
 129         u_int32_t  lrate: 10;
 130         u_int32_t  master: 1;
 131         u_int32_t  mod: 2;
 132         u_int32_t  crc16: 1;
 133         u_int32_t  fill_7e: 1;
 134         u_int32_t  inv: 1;
 135         u_int32_t  rburst: 1;
 136         u_int32_t  wburst: 1;
 137         u_int32_t  : 14;
 138 };
 139
 140 /* SHDSL transceiver statistics */
 141 struct dsl_stats {
 142         u_int8_t        status_1, status_3;
 143         u_int8_t        attenuat, nmr, tpbo, rpbo;
 144         u_int16_t       losw, segd, crc, sega, losd;
 145 };
 146
 147 enum State { NOT_LOADED, DOWN, ACTIVATION, ACTIVE };
 148
 149 #define SIOCLOADFIRMW   _IOWR('i', 67, struct ifreq)
 150 #define SIOCGETSTATS    _IOWR('i', 68, struct ifreq)
 151 #define SIOCCLRSTATS    _IOWR('i', 69, struct ifreq)
 152
 153 static int      sbsh_probe(device_t);
 154 static int      sbsh_attach(device_t);
 155 static int      sbsh_detach(device_t);
 156 static int      sbsh_ioctl(struct ifnet *, u_long, caddr_t, 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, s;
 224
 225         s = splimp();
 226
 227         sc = device_get_softc(dev);
 228         unit = device_get_unit(dev);
 229
 230         rid = PCIR_MAPS + 4;
 231         sc->mem_res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
 232                                         0, ~0, 4096, RF_ACTIVE);
 233
 234         if (sc->mem_res == NULL) {
 235                 printf ("sbsh%d: couldn't map memory\n", unit);
 236                 error = ENXIO;
 237                 goto fail;
 238         }
 239
 240         rid = 0;
 241         sc->irq_res = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
 242                                                 RF_SHAREABLE | RF_ACTIVE);
 243
 244         if (sc->irq_res == NULL) {
 245                 printf("sbsh%d: couldn't map interrupt\n", unit);
 246                 bus_release_resource(dev, SYS_RES_MEMORY,
 247                                         PCIR_MAPS + 4, sc->mem_res);
 248                 error = ENXIO;
 249                 goto fail;
 250         }
 251
 252         sc->mem_base = rman_get_virtual(sc->mem_res);
 253         init_card(sc);
 254
 255         error = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_NET,
 256                                 sbsh_intr, sc, &sc->intr_hand);
 257         if (error) {
 258                 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
 259                 bus_release_resource(dev, SYS_RES_MEMORY,
 260                                         PCIR_MAPS + 4, sc->mem_res);
 261                 printf("sbsh%d: couldn't set up irq\n", unit);
 262                 goto fail;
 263         }
 264
 265         /* generate ethernet MAC address */
 266         *(u_int32_t *)sc->arpcom.ac_enaddr = htonl(0x00ff0192);
 267         read_random_unlimited(sc->arpcom.ac_enaddr + 4, 2);
 268
 269         ifp = &sc->arpcom.ac_if;
 270         ifp->if_softc = sc;
 271         if_initname(ifp, "sbsh", unit);
 272         ifp->if_mtu = ETHERMTU;
 273         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 274         ifp->if_ioctl = sbsh_ioctl;
 275         ifp->if_output = ether_output;
 276         ifp->if_start = sbsh_start;
 277         ifp->if_watchdog = sbsh_watchdog;
 278         ifp->if_init = sbsh_init;
 279         ifp->if_baudrate = 4600000;
 280         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 281
 282         ether_ifattach(ifp, sc->arpcom.ac_enaddr);
 283
 284 fail:
 285         splx(s);
 286         return (error);
 287 }
 288
 289 static int
 290 sbsh_detach(device_t dev)
 291 {
 292         struct sbsh_softc       *sc;
 293         struct ifnet            *ifp;
 294         int                     s;
 295
 296         s = splimp();
 297
 298         sc = device_get_softc(dev);
 299         ifp = &sc->arpcom.ac_if;
 300
 301         sbsh_stop(sc);
 302         ether_ifdetach(ifp);
 303
 304         bus_teardown_intr(dev, sc->irq_res, sc->intr_hand);
 305         bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
 306         bus_release_resource(dev, SYS_RES_MEMORY, PCIR_MAPS + 4, sc->mem_res);
 307
 308         splx(s);
 309         return (0);
 310 }
 311
 312
 313 static void
 314 sbsh_start(struct ifnet *ifp)
 315 {
 316         struct sbsh_softc  *sc = ifp->if_softc;
 317         int  s;
 318
 319         if (sc->state != ACTIVE)
 320                 return;
 321
 322         s = splimp();
 323         start_xmit_frames(ifp->if_softc);
 324         splx(s);
 325 }
 326
 327
 328 static void
 329 sbsh_init(void *xsc)
 330 {
 331         struct sbsh_softc       *sc = xsc;
 332         struct ifnet            *ifp = &sc->arpcom.ac_if;
 333         int                     s;
 334         u_int8_t                t;
 335
 336         if ((ifp->if_flags & IFF_RUNNING) || sc->state == NOT_LOADED)
 337                 return;
 338
 339         s = splimp();
 340
 341         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 342         sc->head_xq = sc->tail_xq = sc->head_rq = sc->tail_rq = 0;
 343         sc->head_tdesc = sc->head_rdesc = 0;
 344
 345         sc->regs->IMR = EXT;
 346         t = 2;
 347         issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1);
 348         if (issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1) == 0) {
 349                 sc->state = ACTIVATION;
 350
 351                 ifp->if_flags |= IFF_RUNNING;
 352                 ifp->if_flags &= ~IFF_OACTIVE;
 353         }
 354
 355         splx(s);
 356 }
 357
 358
 359 static void
 360 sbsh_stop(struct sbsh_softc *sc)
 361 {
 362         int  s;
 363         u_int8_t  t;
 364
 365         s = splimp();
 366         sc->regs->IMR = EXT;
 367
 368         t = 0;
 369         issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1);
 370         if (sc->state == ACTIVE) {
 371                 t = 1;
 372                 issue_cx28975_cmd(sc, _DSL_FORCE_DEACTIVATE, &t, 1);
 373                 /* FIX! activation manager state */
 374
 375                 /* Is it really must be done here? It calls from intr handler */
 376                 deactivate(sc);
 377         }
 378
 379         sc->regs->IMR = 0;
 380         sc->state = DOWN;
 381         splx(s);
 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                     s, error = 0;
 408         u_int8_t                t;
 409
 410         s = splimp();
 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, 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
 476         case SIOCSIFADDR:
 477         case SIOCGIFADDR:
 478         case SIOCSIFMTU:
 479                 error = ether_ioctl(ifp, cmd, data);
 480                 break;
 481
 482         case SIOCSIFFLAGS:
 483                 if (ifp->if_flags & IFF_UP) {
 484                         if (!(ifp->if_flags & IFF_RUNNING)) {
 485                                 if (sc->state == NOT_LOADED) {
 486                                         if_printf(ifp, "firmware wasn't loaded\n");
 487                                         error = EBUSY;
 488                                 } else
 489                                         sbsh_init(sc);
 490                         }
 491                 } else {
 492                         if (ifp->if_flags & IFF_RUNNING) {
 493                                 sbsh_stop(sc);
 494                                 ifp->if_flags &= ~IFF_RUNNING;
 495                         }
 496                 }
 497                 break;
 498
 499         case SIOCADDMULTI:
 500         case SIOCDELMULTI:
 501                 error = 0;
 502                 break;
 503
 504         default:
 505                 error = EINVAL;
 506                 break;
 507         }
 508
 509         splx(s);
 510         return (error);
 511 }
 512
 513
 514 static void
 515 sbsh_shutdown(device_t dev)
 516 {
 517         struct sbsh_softc       *sc = device_get_softc(dev);
 518
 519         sbsh_stop(sc);
 520 }
 521
 522 static int
 523 sbsh_suspend(device_t dev)
 524 {
 525         struct sbsh_softc       *sc = device_get_softc(dev);
 526         int                     s;
 527
 528         s = splimp();
 529         sbsh_stop(sc);
 530         splx(s);
 531
 532         return (0);
 533 }
 534
 535 static int
 536 sbsh_resume(device_t dev)
 537 {
 538         struct sbsh_softc       *sc = device_get_softc(dev);
 539         struct ifnet            *ifp;
 540         int                     s;
 541
 542         s = splimp();
 543         ifp = &sc->arpcom.ac_if;
 544
 545         if (ifp->if_flags & IFF_UP)
 546                 sbsh_init(sc);
 547
 548         splx(s);
 549         return (0);
 550 }
 551
 552
 553 static void
 554 sbsh_watchdog(struct ifnet *ifp)
 555 {
 556         struct sbsh_softc       *sc = ifp->if_softc;
 557
 558         if_printf(ifp, "transmit timeout\n");
 559
 560         if (sc->regs->SR & TXS) {
 561                 sc->regs->SR = TXS;
 562                 if_printf(ifp, "interrupt posted but not delivered\n");
 563         }
 564         free_sent_buffers(sc);
 565 }
 566
 567 /* -------------------------------------------------------------------------- */
 568
 569 static void
 570 sbsh_intr(void *arg)
 571 {
 572         struct sbsh_softc  *sc = (struct sbsh_softc *)arg;
 573         u_int8_t  status = sc->regs->SR;
 574
 575         if (status == 0)
 576                 return;
 577
 578         if (status & EXT) {
 579                 cx28975_interrupt(sc);
 580                 sc->regs->SR = EXT;
 581         }
 582
 583         if (status & UFL) {
 584                 resume_tx(sc);
 585                 sc->regs->SR = UFL;
 586                 ++sc->in_stats.ufl_errs;
 587                 ++sc->arpcom.ac_if.if_oerrors;
 588         }
 589
 590         if (status & RXS) {
 591                 sc->regs->SR = RXS;
 592                 indicate_frames(sc);
 593                 alloc_rx_buffers(sc);
 594         }
 595
 596         if (status & TXS) {
 597                 sc->regs->SR = TXS;
 598                 free_sent_buffers(sc);
 599         }
 600
 601         if (status & CRC) {
 602                 ++sc->in_stats.crc_errs;
 603                 ++sc->arpcom.ac_if.if_ierrors;
 604                 sc->regs->SR = CRC;
 605         }
 606
 607         if (status & OFL) {
 608                 ++sc->in_stats.ofl_errs;
 609                 ++sc->arpcom.ac_if.if_ierrors;
 610                 sc->regs->SR = OFL;
 611         }
 612 }
 613
 614 /*
 615  * Look for a first descriptor of a next packet, and write it's number
 616  * into CTDR. Then enable the transmitter.
 617  */
 618 static void
 619 resume_tx(struct sbsh_softc *sc)
 620 {
 621         u_int32_t       cur_tbd = sc->regs->CTDR;
 622
 623         while (cur_tbd != sc->regs->LTDR
 624                 && (sc->tbd[cur_tbd++].length & LAST_FRAG) == 0)
 625                 ;
 626         sc->regs->CTDR = cur_tbd;
 627         sc->regs->CR |= TXEN;
 628 }
 629
 630 static void
 631 start_xmit_frames(struct sbsh_softc *sc)
 632 {
 633         struct ifnet    *ifp = &sc->arpcom.ac_if;
 634         struct mbuf     *m;
 635
 636         /*
 637          * Check if we have any free descriptor(s) and free space in
 638          * our transmit queue.
 639          */
 640         while (sc->tail_xq != ((sc->head_xq - 1) & (XQLEN - 1))
 641             && sc->regs->LTDR != ((sc->head_tdesc - 1) & 0x7f)) {
 642
 643                 IF_DEQUEUE(&ifp->if_snd, m);
 644                 if (!m)
 645                         break;
 646                 if (m->m_pkthdr.len) {
 647                         if (ifp->if_bpf)
 648                                 bpf_mtap(ifp, m);
 649                         encap_frame(sc, m);
 650                 } else
 651                         m_freem(m);
 652         }
 653
 654         if (sc->regs->CTDR != sc->regs->LTDR)
 655                 ifp->if_flags |= IFF_OACTIVE;
 656         else
 657                 ifp->if_flags &= ~IFF_OACTIVE;
 658 }
 659
 660
 661 /*
 662  * MUST be called at splimp
 663  */
 664 static void
 665 encap_frame(struct sbsh_softc *sc, struct mbuf *m_head)
 666 {
 667         struct mbuf     *m;
 668         u_int32_t       cur_tbd;
 669         int  done;
 670
 671 look_for_nonzero:
 672         for (m = m_head; !m->m_len; m = m->m_next)
 673                 ;
 674
 675         cur_tbd = sc->regs->LTDR & 0x7f;
 676         done = 0;
 677         do {
 678                 if (m->m_len < 5 || cur_tbd == ((sc->head_tdesc - 1) & 0x7f)) {
 679                         if ((m_head = repack(sc, m_head)) != NULL)
 680                                 goto look_for_nonzero;
 681                         else
 682                                 return;
 683                 }
 684
 685                 sc->tbd[cur_tbd].address = vtophys(mtod(m, vm_offset_t));
 686                 sc->tbd[cur_tbd].length  = m->m_len;
 687
 688                 do {
 689                         m = m->m_next;
 690                 } while (m && !m->m_len);
 691
 692                 if (!m) {       /* last fragment has been reached */
 693                         sc->tbd[cur_tbd].length |= LAST_FRAG;
 694                         done = 1;
 695                 }
 696
 697                 ++cur_tbd;
 698                 cur_tbd &= 0x7f;
 699         } while (!done);
 700
 701         sc->xq[sc->tail_xq++] = m_head;
 702         sc->tail_xq &= (XQLEN - 1);
 703
 704         sc->regs->LTDR = cur_tbd;
 705         ++sc->in_stats.sent_pkts;
 706         ++sc->arpcom.ac_if.if_opackets;
 707 }
 708
 709 static struct mbuf *
 710 repack(struct sbsh_softc *sc, struct mbuf *m)
 711 {
 712         struct mbuf  *m_new;
 713
 714         MGETHDR(m_new, MB_DONTWAIT, MT_DATA);
 715         if (!m_new) {
 716                 if_printf (&sc->arpcom.ac_if,
 717                            "unable to get mbuf.\n");
 718                 return (NULL);
 719         }
 720
 721         if (m->m_pkthdr.len > MHLEN) {
 722                 MCLGET(m_new, MB_DONTWAIT);
 723                 if (!(m_new->m_flags & M_EXT)) {
 724                         m_freem(m_new);
 725                         if_printf (&sc->arpcom.ac_if,
 726                                    "unable to get mbuf cluster.\n");
 727                         return (NULL);
 728                 }
 729         }
 730
 731         m_copydata(m, 0, m->m_pkthdr.len, mtod(m_new, caddr_t));
 732         m_new->m_pkthdr.len = m_new->m_len = m->m_pkthdr.len;
 733         m_freem(m);
 734         return (m_new);
 735 }
 736
 737 static void
 738 free_sent_buffers(struct sbsh_softc *sc)
 739 {
 740         u_int32_t  cur_tbd;
 741
 742         cur_tbd = sc->regs->CTDR;
 743
 744         while (sc->head_tdesc != cur_tbd) {
 745                 /*
 746                  * Be careful! one element in xq may correspond to
 747                  * multiple descriptors.
 748                  */
 749                 if (sc->tbd[sc->head_tdesc].length & LAST_FRAG) {
 750                         m_freem(sc->xq[sc->head_xq++]);
 751                         sc->head_xq &= (XQLEN - 1);
 752                 }
 753
 754                 sc->tbd[sc->head_tdesc].length = 0;
 755                 sc->head_tdesc = (sc->head_tdesc + 1) & 0x7f;
 756         }
 757
 758         start_xmit_frames(sc);
 759 }
 760
 761 /*
 762  * DON'T use free_sent_buffers to drop the queue!
 763  */
 764 static void
 765 alloc_rx_buffers(struct sbsh_softc *sc)
 766 {
 767         unsigned        cur_rbd = sc->regs->LRDR & 0x7f;
 768         struct mbuf     *m;
 769
 770         while (sc->tail_rq != ((sc->head_rq - 1) & (RQLEN - 1))) {
 771                 MGETHDR(m, MB_DONTWAIT, MT_DATA);
 772                 if (!m) {
 773                         if_printf (&sc->arpcom.ac_if,
 774                                    "unable to get mbuf.\n");
 775                         return;
 776                 }
 777
 778                 if (SBNI16_MAX_FRAME > MHLEN) {
 779                         MCLGET(m, MB_DONTWAIT);
 780                         if (!(m->m_flags & M_EXT)) {
 781                                 m_freem(m);
 782                                 if_printf (&sc->arpcom.ac_if,
 783                                            "unable to get mbuf cluster.\n");
 784                                 return;
 785                         }
 786                         m->m_pkthdr.len = m->m_len = MCLBYTES;
 787                 }
 788
 789                 m_adj(m, 2);    /* align ip on longword boundaries */
 790
 791                 sc->rq[sc->tail_rq++] = m;
 792                 sc->tail_rq &= (RQLEN - 1);
 793
 794                 sc->rbd[cur_rbd].address = vtophys(mtod(m, vm_offset_t));
 795                 sc->rbd[cur_rbd].length  = 0;
 796                 sc->regs->LRDR = cur_rbd = (cur_rbd + 1) & 0x7f;
 797         }
 798 }
 799
 800 static void
 801 indicate_frames(struct sbsh_softc *sc)
 802 {
 803         struct ether_header *eh;
 804         unsigned  cur_rbd = sc->regs->CRDR & 0x7f;
 805
 806         while (sc->head_rdesc != cur_rbd) {
 807                 struct mbuf  *m = sc->rq[sc->head_rq++];
 808                 sc->head_rq &= (RQLEN - 1);
 809
 810                 m->m_pkthdr.len = m->m_len =
 811                                 sc->rbd[sc->head_rdesc].length & 0x7ff;
 812                 m->m_pkthdr.rcvif = &sc->arpcom.ac_if;
 813
 814                 eh = mtod(m, struct ether_header *);
 815                 m_adj(m, sizeof(struct ether_header));
 816                 ether_input(&sc->arpcom.ac_if, eh, m);
 817                 ++sc->in_stats.rcvd_pkts;
 818                 ++sc->arpcom.ac_if.if_ipackets;
 819
 820                 sc->head_rdesc = (sc->head_rdesc + 1) & 0x7f;
 821         }
 822 }
 823
 824 static void
 825 drop_queues(struct sbsh_softc *sc)
 826 {
 827         while (sc->head_rq != sc->tail_rq) {
 828                 m_freem(sc->rq[sc->head_rq++]);
 829                 sc->head_rq &= (RQLEN - 1);
 830         }
 831
 832         while (sc->head_xq != sc->tail_xq) {
 833                 m_freem(sc->xq[sc->head_xq++]);
 834                 sc->head_xq &= (XQLEN - 1);
 835         }
 836 }
 837
 838 /* -------------------------------------------------------------------------- */
 839
 840 static void
 841 activate(struct sbsh_softc *sc)
 842 {
 843         struct timeval  tv;
 844
 845         sc->regs->SR   = 0xff;          /* clear it! */
 846         sc->regs->CTDR = sc->regs->LTDR = sc->regs->CRDR = sc->regs->LRDR = 0;
 847
 848         sc->head_tdesc = sc->head_rdesc = 0;
 849         alloc_rx_buffers(sc);
 850
 851         sc->regs->CRB &= ~RXDE;
 852         sc->regs->IMR = EXT | RXS | TXS | CRC | OFL | UFL;
 853         sc->regs->CR |= TXEN | RXEN;
 854
 855         sc->state = ACTIVE;
 856         ++sc->in_stats.attempts;
 857         microtime(&tv);
 858         sc->in_stats.last_time = tv.tv_sec;
 859         start_xmit_frames(sc);
 860 }
 861
 862 static void
 863 deactivate(struct sbsh_softc *sc)
 864 {
 865         sc->regs->CR &= ~(RXEN | TXEN);
 866         sc->regs->CRB |= RXDE;
 867         sc->regs->IMR  = EXT;
 868         sc->regs->CTDR = sc->regs->LTDR;
 869         sc->regs->CRDR = sc->regs->LRDR;
 870         sc->state = ACTIVATION;
 871
 872         drop_queues(sc);
 873 }
 874
 875 /* -------------------------------------------------------------------------- */
 876
 877 static void
 878 cx28975_interrupt(struct sbsh_softc *sc)
 879 {
 880         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 881         u_int8_t  t;
 882
 883         if (p->intr_host != 0xfe)
 884                 return;
 885
 886         if (p->out_ack & 0x80) {
 887                 if (*((volatile u_int8_t *)p + 0x3c7) & 2) {
 888                         if (sc->state != ACTIVE
 889                             && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) == 0x40) {
 890                                 activate(sc);
 891                                 if_printf(&sc->arpcom.ac_if, "connected to peer\n");
 892                         } else if (sc->state == ACTIVE
 893                                  && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) != 0x40) {
 894                                 deactivate(sc);
 895                                 if_printf(&sc->arpcom.ac_if, "carrier lost\n");
 896                         }
 897                 }
 898
 899                 p->intr_host = 0;
 900                 t = p->intr_host;
 901                 p->out_ack = 0;
 902         } else {
 903                 wakeup(sc);
 904
 905                 p->intr_host = 0;
 906                 t = p->intr_host;
 907         }
 908 }
 909
 910 /* -------------------------------------------------------------------------- */
 911
 912 static int
 913 start_cx28975(struct sbsh_softc *sc, struct cx28975_cfg cfg)
 914 {
 915         static char  thresh[] = { +8, -4, -16, -40 };
 916
 917         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 918         u_int8_t  t, parm[12];
 919
 920         p->intr_host = 0;
 921         t = p->intr_host;
 922
 923         /* reset chip set */
 924         sc->regs->IMR = EXT;
 925         sc->regs->CR  = 0;
 926         sc->regs->SR  = 0xff;
 927         DELAY(2);
 928         sc->regs->CR = XRST;
 929         if (cfg.crc16)
 930                 sc->regs->CR |= CMOD;
 931         if (cfg.fill_7e)
 932                 sc->regs->CR |= FMOD;
 933         if (cfg.inv)
 934                 sc->regs->CR |= PMOD;
 935
 936         sc->regs->CRB |= RODD | RXDE;
 937         if (cfg.rburst)
 938                 sc->regs->CRB |= RDBE;
 939         if (cfg.wburst)
 940                 sc->regs->CRB |= WTBE;
 941
 942         tsleep(sc, 0, "sbsh", 0);
 943         if ((p->out_ack & 0x1f) != _ACK_BOOT_WAKE_UP)
 944                 return (-1);
 945
 946         if (download_firmware(sc, cfg.firmw_image, cfg.firmw_len))
 947                 return (-1);
 948
 949         tsleep(sc, 0, "sbsh", 0);
 950         if ((p->out_ack & 0x1f) != _ACK_OPER_WAKE_UP)
 951                 return (-1);
 952
 953         t = cfg.master ? 1 : 9;
 954         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_ENABLE, &t, 1))
 955                 return (-1);
 956
 957         t = 0x63;
 958         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_CONFIG, &t, 1))
 959                 return (-1);
 960
 961         *(u_int16_t *)parm = cfg.lrate >> 3;
 962         parm[2] = parm[3] = parm[0];
 963         parm[5] = cfg.lrate & 7;
 964         parm[4] = parm[7] = 1;
 965         parm[6] = 0;
 966         if (issue_cx28975_cmd(sc, _DSL_MULTI_RATE_CONFIG, parm, 8))
 967                 return (-1);
 968
 969         parm[0] = 0x02 | (cfg.mod << 4);
 970         parm[1] = 0;
 971         if (issue_cx28975_cmd(sc, _DSL_TRAINING_MODE, parm, 2))
 972                 return (-1);
 973
 974         bzero(parm, 12);
 975         parm[0] = 0x04;         /* pre-activation: G.hs */
 976         parm[4] = 0x04;         /* no remote configuration */
 977         parm[7] = 0x01;         /* annex A (default) */
 978         parm[8] = 0xff;         /* i-bit mask (all bits) */
 979         if (issue_cx28975_cmd(sc, _DSL_PREACTIVATION_CFG, parm, 12))
 980                 return (-1);
 981
 982         parm[0] = 0x03;         /* dying gasp time - 3 frames */
 983         parm[1] = thresh[cfg.mod];
 984         parm[2] = 0xff;         /* attenuation */
 985         parm[3] = 0x04;         /* line probe NMR (+2 dB) */
 986         parm[4] = 0x00;         /* reserved */
 987         parm[5] = 0x00;
 988         if (issue_cx28975_cmd(sc, _DSL_THRESHOLDS, parm, 6))
 989                 return (-1);
 990
 991         t = cfg.master ? 0x23 : 0x21;
 992         if (issue_cx28975_cmd(sc, _DSL_FR_PCM_CONFIG, &t, 1))
 993                 return (-1);
 994
 995         t = 0x02;
 996         if (issue_cx28975_cmd(sc, _DSL_INTR_HOST_MASK, &t, 1))
 997                 return (-1);
 998
 999         sc->state = DOWN;
1000         return (0);
1001 }
1002
1003 static int
1004 download_firmware(struct sbsh_softc *sc, u_int8_t *img, u_int32_t img_len)
1005 {
1006         u_int32_t       t;
1007         int             i;
1008         u_int8_t        cksum = 0;
1009
1010         for (i = 0; i < img_len; ++i)
1011                 cksum += img[i];
1012
1013         t = img_len;
1014         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_START, (u_int8_t *) &t, 4))
1015                 return (-1);
1016
1017         for (i = 0; img_len >= 75; i += 75, img_len -= 75) {
1018                 if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, 75))
1019                         return (-1);
1020         }
1021
1022         if (img_len
1023             &&  issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, img_len))
1024                 return (-1);
1025
1026         t = (cksum ^ 0xff) + 1;
1027         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_END, (u_int8_t *) &t, 1))
1028                 return (-1);
1029
1030         return (0);
1031 }
1032
1033 static int
1034 issue_cx28975_cmd(struct sbsh_softc *sc, u_int8_t cmd,
1035                         u_int8_t *data, u_int8_t size)
1036 {
1037         volatile struct cx28975_cmdarea  *p = sc->cmdp;
1038         u_int8_t  *databuf = p->in_data;
1039         int  i;
1040
1041         u_int8_t  cksum = 0;
1042
1043         p->in_dest      = 0xf0;
1044         p->in_opcode    = cmd;
1045         p->in_zero      = 0;
1046         p->in_length    = --size;
1047         p->in_csum      = 0xf0 ^ cmd ^ size ^ 0xaa;
1048
1049         for (i = 0; i <= size; ++i) {
1050                 cksum ^= *data;
1051                 *databuf++ = *data++;   /* only 1 byte per cycle! */
1052         }
1053
1054         p->in_datasum   = cksum ^ 0xaa;
1055         p->out_ack      = _ACK_NOT_COMPLETE;
1056         p->intr_8051    = 0xfe;
1057
1058         if (tsleep(sc, 0, "sbsh", hz << 3))
1059                 return (-1);
1060
1061         while (p->out_ack == _ACK_NOT_COMPLETE)
1062                 ;                                       /* FIXME ! */
1063
1064         if ((p->out_ack & 0x1f) == _ACK_PASS) {
1065                 p->out_ack = 0;
1066                 return (0);
1067         } else {
1068                 p->out_ack = 0;
1069                 return (-1);
1070         }
1071 }