sys/dev/smc/if_smc.c

   1 /*-
   2  * Copyright (c) 2008 Benno Rice.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24
  25 #include <sys/cdefs.h>
  26 __FBSDID("$FreeBSD$");
  27
  28 /*
  29  * Driver for SMSC LAN91C111, may work for older variants.
  30  */
  31
  32 #ifdef HAVE_KERNEL_OPTION_HEADERS
  33 #include "opt_device_polling.h"
  34 #endif
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/errno.h>
  39 #include <sys/kernel.h>
  40 #include <sys/sockio.h>
  41 #include <sys/malloc.h>
  42 #include <sys/mbuf.h>
  43 #include <sys/queue.h>
  44 #include <sys/socket.h>
  45 #include <sys/syslog.h>
  46 #include <sys/taskqueue.h>
  47
  48 #include <sys/module.h>
  49 #include <sys/bus.h>
  50
  51 #include <machine/bus.h>
  52 #include <machine/resource.h>
  53 #include <sys/rman.h>
  54
  55 #include <net/ethernet.h>
  56 #include <net/if.h>
  57 #include <net/if_arp.h>
  58 #include <net/if_dl.h>
  59 #include <net/if_types.h>
  60 #include <net/if_mib.h>
  61 #include <net/if_media.h>
  62
  63 #ifdef INET
  64 #include <netinet/in.h>
  65 #include <netinet/in_systm.h>
  66 #include <netinet/in_var.h>
  67 #include <netinet/ip.h>
  68 #endif
  69
  70 #include <net/bpf.h>
  71 #include <net/bpfdesc.h>
  72
  73 #include <dev/smc/if_smcreg.h>
  74 #include <dev/smc/if_smcvar.h>
  75
  76 #include <dev/mii/mii.h>
  77 #include <dev/mii/mii_bitbang.h>
  78 #include <dev/mii/miivar.h>
  79
  80 #define SMC_LOCK(sc)            mtx_lock(&(sc)->smc_mtx)
  81 #define SMC_UNLOCK(sc)          mtx_unlock(&(sc)->smc_mtx)
  82 #define SMC_ASSERT_LOCKED(sc)   mtx_assert(&(sc)->smc_mtx, MA_OWNED)
  83
  84 #define SMC_INTR_PRIORITY       0
  85 #define SMC_RX_PRIORITY         5
  86 #define SMC_TX_PRIORITY         10
  87
  88 devclass_t      smc_devclass;
  89
  90 static const char *smc_chip_ids[16] = {
  91         NULL, NULL, NULL,
  92         /* 3 */ "SMSC LAN91C90 or LAN91C92",
  93         /* 4 */ "SMSC LAN91C94",
  94         /* 5 */ "SMSC LAN91C95",
  95         /* 6 */ "SMSC LAN91C96",
  96         /* 7 */ "SMSC LAN91C100",
  97         /* 8 */ "SMSC LAN91C100FD",
  98         /* 9 */ "SMSC LAN91C110FD or LAN91C111FD",
  99         NULL, NULL, NULL,
 100         NULL, NULL, NULL
 101 };
 102
 103 static void     smc_init(void *);
 104 static void     smc_start(struct ifnet *);
 105 static void     smc_stop(struct smc_softc *);
 106 static int      smc_ioctl(struct ifnet *, u_long, caddr_t);
 107
 108 static void     smc_init_locked(struct smc_softc *);
 109 static void     smc_start_locked(struct ifnet *);
 110 static void     smc_reset(struct smc_softc *);
 111 static int      smc_mii_ifmedia_upd(struct ifnet *);
 112 static void     smc_mii_ifmedia_sts(struct ifnet *, struct ifmediareq *);
 113 static void     smc_mii_tick(void *);
 114 static void     smc_mii_mediachg(struct smc_softc *);
 115 static int      smc_mii_mediaioctl(struct smc_softc *, struct ifreq *, u_long);
 116
 117 static void     smc_task_intr(void *, int);
 118 static void     smc_task_rx(void *, int);
 119 static void     smc_task_tx(void *, int);
 120
 121 static driver_filter_t  smc_intr;
 122 static timeout_t        smc_watchdog;
 123 #ifdef DEVICE_POLLING
 124 static poll_handler_t   smc_poll;
 125 #endif
 126
 127 /*
 128  * MII bit-bang glue
 129  */
 130 static uint32_t smc_mii_bitbang_read(device_t);
 131 static void smc_mii_bitbang_write(device_t, uint32_t);
 132
 133 static const struct mii_bitbang_ops smc_mii_bitbang_ops = {
 134         smc_mii_bitbang_read,
 135         smc_mii_bitbang_write,
 136         {
 137                 MGMT_MDO,       /* MII_BIT_MDO */
 138                 MGMT_MDI,       /* MII_BIT_MDI */
 139                 MGMT_MCLK,      /* MII_BIT_MDC */
 140                 MGMT_MDOE,      /* MII_BIT_DIR_HOST_PHY */
 141                 0,              /* MII_BIT_DIR_PHY_HOST */
 142         }
 143 };
 144
 145 static __inline void
 146 smc_select_bank(struct smc_softc *sc, uint16_t bank)
 147 {
 148
 149         bus_barrier(sc->smc_reg, BSR, 2,
 150             BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
 151         bus_write_2(sc->smc_reg, BSR, bank & BSR_BANK_MASK);
 152         bus_barrier(sc->smc_reg, BSR, 2,
 153             BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
 154 }
 155
 156 /* Never call this when not in bank 2. */
 157 static __inline void
 158 smc_mmu_wait(struct smc_softc *sc)
 159 {
 160
 161         KASSERT((bus_read_2(sc->smc_reg, BSR) &
 162             BSR_BANK_MASK) == 2, ("%s: smc_mmu_wait called when not in bank 2",
 163             device_get_nameunit(sc->smc_dev)));
 164         while (bus_read_2(sc->smc_reg, MMUCR) & MMUCR_BUSY)
 165                 ;
 166 }
 167
 168 static __inline uint8_t
 169 smc_read_1(struct smc_softc *sc, bus_size_t offset)
 170 {
 171
 172         return (bus_read_1(sc->smc_reg, offset));
 173 }
 174
 175 static __inline void
 176 smc_write_1(struct smc_softc *sc, bus_size_t offset, uint8_t val)
 177 {
 178
 179         bus_write_1(sc->smc_reg, offset, val);
 180 }
 181
 182 static __inline uint16_t
 183 smc_read_2(struct smc_softc *sc, bus_size_t offset)
 184 {
 185
 186         return (bus_read_2(sc->smc_reg, offset));
 187 }
 188
 189 static __inline void
 190 smc_write_2(struct smc_softc *sc, bus_size_t offset, uint16_t val)
 191 {
 192
 193         bus_write_2(sc->smc_reg, offset, val);
 194 }
 195
 196 static __inline void
 197 smc_read_multi_2(struct smc_softc *sc, bus_size_t offset, uint16_t *datap,
 198     bus_size_t count)
 199 {
 200
 201         bus_read_multi_2(sc->smc_reg, offset, datap, count);
 202 }
 203
 204 static __inline void
 205 smc_write_multi_2(struct smc_softc *sc, bus_size_t offset, uint16_t *datap,
 206     bus_size_t count)
 207 {
 208
 209         bus_write_multi_2(sc->smc_reg, offset, datap, count);
 210 }
 211
 212 static __inline void
 213 smc_barrier(struct smc_softc *sc, bus_size_t offset, bus_size_t length,
 214     int flags)
 215 {
 216
 217         bus_barrier(sc->smc_reg, offset, length, flags);
 218 }
 219
 220 int
 221 smc_probe(device_t dev)
 222 {
 223         int                     rid, type, error;
 224         uint16_t                val;
 225         struct smc_softc        *sc;
 226         struct resource         *reg;
 227
 228         sc = device_get_softc(dev);
 229         rid = 0;
 230         type = SYS_RES_IOPORT;
 231         error = 0;
 232
 233         if (sc->smc_usemem)
 234                 type = SYS_RES_MEMORY;
 235
 236         reg = bus_alloc_resource(dev, type, &rid, 0, ~0, 16, RF_ACTIVE);
 237         if (reg == NULL) {
 238                 if (bootverbose)
 239                         device_printf(dev,
 240                             "could not allocate I/O resource for probe\n");
 241                 return (ENXIO);
 242         }
 243
 244         /* Check for the identification value in the BSR. */
 245         val = bus_read_2(reg, BSR);
 246         if ((val & BSR_IDENTIFY_MASK) != BSR_IDENTIFY) {
 247                 if (bootverbose)
 248                         device_printf(dev, "identification value not in BSR\n");
 249                 error = ENXIO;
 250                 goto done;
 251         }
 252
 253         /*
 254          * Try switching banks and make sure we still get the identification
 255          * value.
 256          */
 257         bus_write_2(reg, BSR, 0);
 258         val = bus_read_2(reg, BSR);
 259         if ((val & BSR_IDENTIFY_MASK) != BSR_IDENTIFY) {
 260                 if (bootverbose)
 261                         device_printf(dev,
 262                             "identification value not in BSR after write\n");
 263                 error = ENXIO;
 264                 goto done;
 265         }
 266
 267 #if 0
 268         /* Check the BAR. */
 269         bus_write_2(reg, BSR, 1);
 270         val = bus_read_2(reg, BAR);
 271         val = BAR_ADDRESS(val);
 272         if (rman_get_start(reg) != val) {
 273                 if (bootverbose)
 274                         device_printf(dev, "BAR address %x does not match "
 275                             "I/O resource address %lx\n", val,
 276                             rman_get_start(reg));
 277                 error = ENXIO;
 278                 goto done;
 279         }
 280 #endif
 281
 282         /* Compare REV against known chip revisions. */
 283         bus_write_2(reg, BSR, 3);
 284         val = bus_read_2(reg, REV);
 285         val = (val & REV_CHIP_MASK) >> REV_CHIP_SHIFT;
 286         if (smc_chip_ids[val] == NULL) {
 287                 if (bootverbose)
 288                         device_printf(dev, "Unknown chip revision: %d\n", val);
 289                 error = ENXIO;
 290                 goto done;
 291         }
 292
 293         device_set_desc(dev, smc_chip_ids[val]);
 294
 295 done:
 296         bus_release_resource(dev, type, rid, reg);
 297         return (error);
 298 }
 299
 300 int
 301 smc_attach(device_t dev)
 302 {
 303         int                     type, error;
 304         uint16_t                val;
 305         u_char                  eaddr[ETHER_ADDR_LEN];
 306         struct smc_softc        *sc;
 307         struct ifnet            *ifp;
 308
 309         sc = device_get_softc(dev);
 310         error = 0;
 311
 312         sc->smc_dev = dev;
 313
 314         ifp = sc->smc_ifp = if_alloc(IFT_ETHER);
 315         if (ifp == NULL) {
 316                 error = ENOSPC;
 317                 goto done;
 318         }
 319
 320         mtx_init(&sc->smc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
 321
 322         /* Set up watchdog callout. */
 323         callout_init_mtx(&sc->smc_watchdog, &sc->smc_mtx, 0);
 324
 325         type = SYS_RES_IOPORT;
 326         if (sc->smc_usemem)
 327                 type = SYS_RES_MEMORY;
 328
 329         sc->smc_reg_rid = 0;
 330         sc->smc_reg = bus_alloc_resource(dev, type, &sc->smc_reg_rid, 0, ~0,
 331             16, RF_ACTIVE);
 332         if (sc->smc_reg == NULL) {
 333                 error = ENXIO;
 334                 goto done;
 335         }
 336
 337         sc->smc_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->smc_irq_rid, 0,
 338             ~0, 1, RF_ACTIVE | RF_SHAREABLE);
 339         if (sc->smc_irq == NULL) {
 340                 error = ENXIO;
 341                 goto done;
 342         }
 343
 344         SMC_LOCK(sc);
 345         smc_reset(sc);
 346         SMC_UNLOCK(sc);
 347
 348         smc_select_bank(sc, 3);
 349         val = smc_read_2(sc, REV);
 350         sc->smc_chip = (val & REV_CHIP_MASK) >> REV_CHIP_SHIFT;
 351         sc->smc_rev = (val * REV_REV_MASK) >> REV_REV_SHIFT;
 352         if (bootverbose)
 353                 device_printf(dev, "revision %x\n", sc->smc_rev);
 354
 355         callout_init_mtx(&sc->smc_mii_tick_ch, &sc->smc_mtx,
 356             CALLOUT_RETURNUNLOCKED);
 357         if (sc->smc_chip >= REV_CHIP_91110FD) {
 358                 (void)mii_attach(dev, &sc->smc_miibus, ifp,
 359                     smc_mii_ifmedia_upd, smc_mii_ifmedia_sts, BMSR_DEFCAPMASK,
 360                     MII_PHY_ANY, MII_OFFSET_ANY, 0);
 361                 if (sc->smc_miibus != NULL) {
 362                         sc->smc_mii_tick = smc_mii_tick;
 363                         sc->smc_mii_mediachg = smc_mii_mediachg;
 364                         sc->smc_mii_mediaioctl = smc_mii_mediaioctl;
 365                 }
 366         }
 367
 368         smc_select_bank(sc, 1);
 369         eaddr[0] = smc_read_1(sc, IAR0);
 370         eaddr[1] = smc_read_1(sc, IAR1);
 371         eaddr[2] = smc_read_1(sc, IAR2);
 372         eaddr[3] = smc_read_1(sc, IAR3);
 373         eaddr[4] = smc_read_1(sc, IAR4);
 374         eaddr[5] = smc_read_1(sc, IAR5);
 375
 376         if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 377         ifp->if_softc = sc;
 378         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 379         ifp->if_init = smc_init;
 380         ifp->if_ioctl = smc_ioctl;
 381         ifp->if_start = smc_start;
 382         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 383         IFQ_SET_READY(&ifp->if_snd);
 384
 385         ifp->if_capabilities = ifp->if_capenable = 0;
 386
 387 #ifdef DEVICE_POLLING
 388         ifp->if_capabilities |= IFCAP_POLLING;
 389 #endif
 390
 391         ether_ifattach(ifp, eaddr);
 392
 393         /* Set up taskqueue */
 394         TASK_INIT(&sc->smc_intr, SMC_INTR_PRIORITY, smc_task_intr, ifp);
 395         TASK_INIT(&sc->smc_rx, SMC_RX_PRIORITY, smc_task_rx, ifp);
 396         TASK_INIT(&sc->smc_tx, SMC_TX_PRIORITY, smc_task_tx, ifp);
 397         sc->smc_tq = taskqueue_create_fast("smc_taskq", M_NOWAIT,
 398             taskqueue_thread_enqueue, &sc->smc_tq);
 399         taskqueue_start_threads(&sc->smc_tq, 1, PI_NET, "%s taskq",
 400             device_get_nameunit(sc->smc_dev));
 401
 402         /* Mask all interrupts. */
 403         sc->smc_mask = 0;
 404         smc_write_1(sc, MSK, 0);
 405
 406         /* Wire up interrupt */
 407         error = bus_setup_intr(dev, sc->smc_irq,
 408             INTR_TYPE_NET|INTR_MPSAFE, smc_intr, NULL, sc, &sc->smc_ih);
 409         if (error != 0)
 410                 goto done;
 411
 412 done:
 413         if (error != 0)
 414                 smc_detach(dev);
 415         return (error);
 416 }
 417
 418 int
 419 smc_detach(device_t dev)
 420 {
 421         int                     type;
 422         struct smc_softc        *sc;
 423
 424         sc = device_get_softc(dev);
 425         SMC_LOCK(sc);
 426         smc_stop(sc);
 427         SMC_UNLOCK(sc);
 428
 429         if (sc->smc_ifp != NULL) {
 430                 ether_ifdetach(sc->smc_ifp);
 431         }
 432
 433         callout_drain(&sc->smc_watchdog);
 434         callout_drain(&sc->smc_mii_tick_ch);
 435
 436 #ifdef DEVICE_POLLING
 437         if (sc->smc_ifp->if_capenable & IFCAP_POLLING)
 438                 ether_poll_deregister(sc->smc_ifp);
 439 #endif
 440
 441         if (sc->smc_ih != NULL)
 442                 bus_teardown_intr(sc->smc_dev, sc->smc_irq, sc->smc_ih);
 443
 444         if (sc->smc_tq != NULL) {
 445                 taskqueue_drain(sc->smc_tq, &sc->smc_intr);
 446                 taskqueue_drain(sc->smc_tq, &sc->smc_rx);
 447                 taskqueue_drain(sc->smc_tq, &sc->smc_tx);
 448                 taskqueue_free(sc->smc_tq);
 449                 sc->smc_tq = NULL;
 450         }
 451
 452         if (sc->smc_ifp != NULL) {
 453                 if_free(sc->smc_ifp);
 454         }
 455
 456         if (sc->smc_miibus != NULL) {
 457                 device_delete_child(sc->smc_dev, sc->smc_miibus);
 458                 bus_generic_detach(sc->smc_dev);
 459         }
 460
 461         if (sc->smc_reg != NULL) {
 462                 type = SYS_RES_IOPORT;
 463                 if (sc->smc_usemem)
 464                         type = SYS_RES_MEMORY;
 465
 466                 bus_release_resource(sc->smc_dev, type, sc->smc_reg_rid,
 467                     sc->smc_reg);
 468         }
 469
 470         if (sc->smc_irq != NULL)
 471                 bus_release_resource(sc->smc_dev, SYS_RES_IRQ, sc->smc_irq_rid,
 472                    sc->smc_irq);
 473
 474         if (mtx_initialized(&sc->smc_mtx))
 475                 mtx_destroy(&sc->smc_mtx);
 476
 477         return (0);
 478 }
 479
 480 static void
 481 smc_start(struct ifnet *ifp)
 482 {
 483         struct smc_softc        *sc;
 484
 485         sc = ifp->if_softc;
 486         SMC_LOCK(sc);
 487         smc_start_locked(ifp);
 488         SMC_UNLOCK(sc);
 489 }
 490
 491 static void
 492 smc_start_locked(struct ifnet *ifp)
 493 {
 494         struct smc_softc        *sc;
 495         struct mbuf             *m;
 496         u_int                   len, npages, spin_count;
 497
 498         sc = ifp->if_softc;
 499         SMC_ASSERT_LOCKED(sc);
 500
 501         if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
 502                 return;
 503         if (IFQ_IS_EMPTY(&ifp->if_snd))
 504                 return;
 505
 506         /*
 507          * Grab the next packet.  If it's too big, drop it.
 508          */
 509         IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 510         len = m_length(m, NULL);
 511         len += (len & 1);
 512         if (len > ETHER_MAX_LEN - ETHER_CRC_LEN) {
 513                 if_printf(ifp, "large packet discarded\n");
 514                 ++ifp->if_oerrors;
 515                 m_freem(m);
 516                 return; /* XXX readcheck? */
 517         }
 518
 519         /*
 520          * Flag that we're busy.
 521          */
 522         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
 523         sc->smc_pending = m;
 524
 525         /*
 526          * Work out how many 256 byte "pages" we need.  We have to include the
 527          * control data for the packet in this calculation.
 528          */
 529         npages = (len * PKT_CTRL_DATA_LEN) >> 8;
 530         if (npages == 0)
 531                 npages = 1;
 532
 533         /*
 534          * Request memory.
 535          */
 536         smc_select_bank(sc, 2);
 537         smc_mmu_wait(sc);
 538         smc_write_2(sc, MMUCR, MMUCR_CMD_TX_ALLOC | npages);
 539
 540         /*
 541          * Spin briefly to see if the allocation succeeds.
 542          */
 543         spin_count = TX_ALLOC_WAIT_TIME;
 544         do {
 545                 if (smc_read_1(sc, IST) & ALLOC_INT) {
 546                         smc_write_1(sc, ACK, ALLOC_INT);
 547                         break;
 548                 }
 549         } while (--spin_count);
 550
 551         /*
 552          * If the allocation is taking too long, unmask the alloc interrupt
 553          * and wait.
 554          */
 555         if (spin_count == 0) {
 556                 sc->smc_mask |= ALLOC_INT;
 557                 if ((ifp->if_capenable & IFCAP_POLLING) == 0)
 558                         smc_write_1(sc, MSK, sc->smc_mask);
 559                 return;
 560         }
 561
 562         taskqueue_enqueue_fast(sc->smc_tq, &sc->smc_tx);
 563 }
 564
 565 static void
 566 smc_task_tx(void *context, int pending)
 567 {
 568         struct ifnet            *ifp;
 569         struct smc_softc        *sc;
 570         struct mbuf             *m, *m0;
 571         u_int                   packet, len;
 572         int                     last_len;
 573         uint8_t                 *data;
 574
 575         (void)pending;
 576         ifp = (struct ifnet *)context;
 577         sc = ifp->if_softc;
 578
 579         SMC_LOCK(sc);
 580
 581         if (sc->smc_pending == NULL) {
 582                 SMC_UNLOCK(sc);
 583                 goto next_packet;
 584         }
 585
 586         m = m0 = sc->smc_pending;
 587         sc->smc_pending = NULL;
 588         smc_select_bank(sc, 2);
 589
 590         /*
 591          * Check the allocation result.
 592          */
 593         packet = smc_read_1(sc, ARR);
 594
 595         /*
 596          * If the allocation failed, requeue the packet and retry.
 597          */
 598         if (packet & ARR_FAILED) {
 599                 IFQ_DRV_PREPEND(&ifp->if_snd, m);
 600                 ++ifp->if_oerrors;
 601                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
 602                 smc_start_locked(ifp);
 603                 SMC_UNLOCK(sc);
 604                 return;
 605         }
 606
 607         /*
 608          * Tell the device to write to our packet number.
 609          */
 610         smc_write_1(sc, PNR, packet);
 611         smc_write_2(sc, PTR, 0 | PTR_AUTO_INCR);
 612
 613         /*
 614          * Tell the device how long the packet is (including control data).
 615          */
 616         len = m_length(m, 0);
 617         len += PKT_CTRL_DATA_LEN;
 618         smc_write_2(sc, DATA0, 0);
 619         smc_write_2(sc, DATA0, len);
 620
 621         /*
 622          * Push the data out to the device.
 623          */
 624         data = NULL;
 625         last_len = 0;
 626         for (; m != NULL; m = m->m_next) {
 627                 data = mtod(m, uint8_t *);
 628                 smc_write_multi_2(sc, DATA0, (uint16_t *)data, m->m_len / 2);
 629                 last_len = m->m_len;
 630         }
 631
 632         /*
 633          * Push out the control byte and and the odd byte if needed.
 634          */
 635         if ((len & 1) != 0 && data != NULL)
 636                 smc_write_2(sc, DATA0, (CTRL_ODD << 8) | data[last_len - 1]);
 637         else
 638                 smc_write_2(sc, DATA0, 0);
 639
 640         /*
 641          * Unmask the TX empty interrupt.
 642          */
 643         sc->smc_mask |= TX_EMPTY_INT;
 644         if ((ifp->if_capenable & IFCAP_POLLING) == 0)
 645                 smc_write_1(sc, MSK, sc->smc_mask);
 646
 647         /*
 648          * Enqueue the packet.
 649          */
 650         smc_mmu_wait(sc);
 651         smc_write_2(sc, MMUCR, MMUCR_CMD_ENQUEUE);
 652         callout_reset(&sc->smc_watchdog, hz * 2, smc_watchdog, sc);
 653
 654         /*
 655          * Finish up.
 656          */
 657         ifp->if_opackets++;
 658         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
 659         SMC_UNLOCK(sc);
 660         BPF_MTAP(ifp, m0);
 661         m_freem(m0);
 662
 663 next_packet:
 664         /*
 665          * See if there's anything else to do.
 666          */
 667         smc_start(ifp);
 668 }
 669
 670 static void
 671 smc_task_rx(void *context, int pending)
 672 {
 673         u_int                   packet, status, len;
 674         uint8_t                 *data;
 675         struct ifnet            *ifp;
 676         struct smc_softc        *sc;
 677         struct mbuf             *m, *mhead, *mtail;
 678
 679         (void)pending;
 680         ifp = (struct ifnet *)context;
 681         sc = ifp->if_softc;
 682         mhead = mtail = NULL;
 683
 684         SMC_LOCK(sc);
 685
 686         packet = smc_read_1(sc, FIFO_RX);
 687         while ((packet & FIFO_EMPTY) == 0) {
 688                 /*
 689                  * Grab an mbuf and attach a cluster.
 690                  */
 691                 MGETHDR(m, M_NOWAIT, MT_DATA);
 692                 if (m == NULL) {
 693                         break;
 694                 }
 695                 MCLGET(m, M_NOWAIT);
 696                 if ((m->m_flags & M_EXT) == 0) {
 697                         m_freem(m);
 698                         break;
 699                 }
 700
 701                 /*
 702                  * Point to the start of the packet.
 703                  */
 704                 smc_select_bank(sc, 2);
 705                 smc_write_1(sc, PNR, packet);
 706                 smc_write_2(sc, PTR, 0 | PTR_READ | PTR_RCV | PTR_AUTO_INCR);
 707
 708                 /*
 709                  * Grab status and packet length.
 710                  */
 711                 status = smc_read_2(sc, DATA0);
 712                 len = smc_read_2(sc, DATA0) & RX_LEN_MASK;
 713                 len -= 6;
 714                 if (status & RX_ODDFRM)
 715                         len += 1;
 716
 717                 /*
 718                  * Check for errors.
 719                  */
 720                 if (status & (RX_TOOSHORT | RX_TOOLNG | RX_BADCRC | RX_ALGNERR)) {
 721                         smc_mmu_wait(sc);
 722                         smc_write_2(sc, MMUCR, MMUCR_CMD_RELEASE);
 723                         ifp->if_ierrors++;
 724                         m_freem(m);
 725                         break;
 726                 }
 727
 728                 /*
 729                  * Set the mbuf up the way we want it.
 730                  */
 731                 m->m_pkthdr.rcvif = ifp;
 732                 m->m_pkthdr.len = m->m_len = len + 2; /* XXX: Is this right? */
 733                 m_adj(m, ETHER_ALIGN);
 734
 735                 /*
 736                  * Pull the packet out of the device.  Make sure we're in the
 737                  * right bank first as things may have changed while we were
 738                  * allocating our mbuf.
 739                  */
 740                 smc_select_bank(sc, 2);
 741                 smc_write_1(sc, PNR, packet);
 742                 smc_write_2(sc, PTR, 4 | PTR_READ | PTR_RCV | PTR_AUTO_INCR);
 743                 data = mtod(m, uint8_t *);
 744                 smc_read_multi_2(sc, DATA0, (uint16_t *)data, len >> 1);
 745                 if (len & 1) {
 746                         data += len & ~1;
 747                         *data = smc_read_1(sc, DATA0);
 748                 }
 749
 750                 /*
 751                  * Tell the device we're done.
 752                  */
 753                 smc_mmu_wait(sc);
 754                 smc_write_2(sc, MMUCR, MMUCR_CMD_RELEASE);
 755                 if (m == NULL) {
 756                         break;
 757                 }
 758
 759                 if (mhead == NULL) {
 760                         mhead = mtail = m;
 761                         m->m_next = NULL;
 762                 } else {
 763                         mtail->m_next = m;
 764                         mtail = m;
 765                 }
 766                 packet = smc_read_1(sc, FIFO_RX);
 767         }
 768
 769         sc->smc_mask |= RCV_INT;
 770         if ((ifp->if_capenable & IFCAP_POLLING) == 0)
 771                 smc_write_1(sc, MSK, sc->smc_mask);
 772
 773         SMC_UNLOCK(sc);
 774
 775         while (mhead != NULL) {
 776                 m = mhead;
 777                 mhead = mhead->m_next;
 778                 m->m_next = NULL;
 779                 ifp->if_ipackets++;
 780                 (*ifp->if_input)(ifp, m);
 781         }
 782 }
 783
 784 #ifdef DEVICE_POLLING
 785 static void
 786 smc_poll(struct ifnet *ifp, enum poll_cmd cmd, int count)
 787 {
 788         struct smc_softc        *sc;
 789
 790         sc = ifp->if_softc;
 791
 792         SMC_LOCK(sc);
 793         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
 794                 SMC_UNLOCK(sc);
 795                 return;
 796         }
 797         SMC_UNLOCK(sc);
 798
 799         if (cmd == POLL_AND_CHECK_STATUS)
 800                 taskqueue_enqueue_fast(sc->smc_tq, &sc->smc_intr);
 801 }
 802 #endif
 803
 804 static int
 805 smc_intr(void *context)
 806 {
 807         struct smc_softc        *sc;
 808
 809         sc = (struct smc_softc *)context;
 810         /*
 811          * Block interrupts in order to let smc_task_intr to kick in
 812          */
 813         smc_write_1(sc, MSK, 0);
 814         taskqueue_enqueue_fast(sc->smc_tq, &sc->smc_intr);
 815         return (FILTER_HANDLED);
 816 }
 817
 818 static void
 819 smc_task_intr(void *context, int pending)
 820 {
 821         struct smc_softc        *sc;
 822         struct ifnet            *ifp;
 823         u_int                   status, packet, counter, tcr;
 824
 825         (void)pending;
 826         ifp = (struct ifnet *)context;
 827         sc = ifp->if_softc;
 828
 829         SMC_LOCK(sc);
 830
 831         smc_select_bank(sc, 2);
 832
 833         /*
 834          * Find out what interrupts are flagged.
 835          */
 836         status = smc_read_1(sc, IST) & sc->smc_mask;
 837
 838         /*
 839          * Transmit error
 840          */
 841         if (status & TX_INT) {
 842                 /*
 843                  * Kill off the packet if there is one and re-enable transmit.
 844                  */
 845                 packet = smc_read_1(sc, FIFO_TX);
 846                 if ((packet & FIFO_EMPTY) == 0) {
 847                         smc_write_1(sc, PNR, packet);
 848                         smc_write_2(sc, PTR, 0 | PTR_READ |
 849                             PTR_AUTO_INCR);
 850                         tcr = smc_read_2(sc, DATA0);
 851                         if ((tcr & EPHSR_TX_SUC) == 0)
 852                                 device_printf(sc->smc_dev,
 853                                     "bad packet\n");
 854                         smc_mmu_wait(sc);
 855                         smc_write_2(sc, MMUCR, MMUCR_CMD_RELEASE_PKT);
 856
 857                         smc_select_bank(sc, 0);
 858                         tcr = smc_read_2(sc, TCR);
 859                         tcr |= TCR_TXENA | TCR_PAD_EN;
 860                         smc_write_2(sc, TCR, tcr);
 861                         smc_select_bank(sc, 2);
 862                         taskqueue_enqueue_fast(sc->smc_tq, &sc->smc_tx);
 863                 }
 864
 865                 /*
 866                  * Ack the interrupt.
 867                  */
 868                 smc_write_1(sc, ACK, TX_INT);
 869         }
 870
 871         /*
 872          * Receive
 873          */
 874         if (status & RCV_INT) {
 875                 smc_write_1(sc, ACK, RCV_INT);
 876                 sc->smc_mask &= ~RCV_INT;
 877                 taskqueue_enqueue_fast(sc->smc_tq, &sc->smc_rx);
 878         }
 879
 880         /*
 881          * Allocation
 882          */
 883         if (status & ALLOC_INT) {
 884                 smc_write_1(sc, ACK, ALLOC_INT);
 885                 sc->smc_mask &= ~ALLOC_INT;
 886                 taskqueue_enqueue_fast(sc->smc_tq, &sc->smc_tx);
 887         }
 888
 889         /*
 890          * Receive overrun
 891          */
 892         if (status & RX_OVRN_INT) {
 893                 smc_write_1(sc, ACK, RX_OVRN_INT);
 894                 ifp->if_ierrors++;
 895         }
 896
 897         /*
 898          * Transmit empty
 899          */
 900         if (status & TX_EMPTY_INT) {
 901                 smc_write_1(sc, ACK, TX_EMPTY_INT);
 902                 sc->smc_mask &= ~TX_EMPTY_INT;
 903                 callout_stop(&sc->smc_watchdog);
 904
 905                 /*
 906                  * Update collision stats.
 907                  */
 908                 smc_select_bank(sc, 0);
 909                 counter = smc_read_2(sc, ECR);
 910                 smc_select_bank(sc, 2);
 911                 ifp->if_collisions +=
 912                     (counter & ECR_SNGLCOL_MASK) >> ECR_SNGLCOL_SHIFT;
 913                 ifp->if_collisions +=
 914                     (counter & ECR_MULCOL_MASK) >> ECR_MULCOL_SHIFT;
 915
 916                 /*
 917                  * See if there are any packets to transmit.
 918                  */
 919                 taskqueue_enqueue_fast(sc->smc_tq, &sc->smc_tx);
 920         }
 921
 922         /*
 923          * Update the interrupt mask.
 924          */
 925         if ((ifp->if_capenable & IFCAP_POLLING) == 0)
 926                 smc_write_1(sc, MSK, sc->smc_mask);
 927
 928         SMC_UNLOCK(sc);
 929 }
 930
 931 static uint32_t
 932 smc_mii_bitbang_read(device_t dev)
 933 {
 934         struct smc_softc        *sc;
 935         uint32_t                val;
 936
 937         sc = device_get_softc(dev);
 938
 939         SMC_ASSERT_LOCKED(sc);
 940         KASSERT((smc_read_2(sc, BSR) & BSR_BANK_MASK) == 3,
 941             ("%s: smc_mii_bitbang_read called with bank %d (!= 3)",
 942             device_get_nameunit(sc->smc_dev),
 943             smc_read_2(sc, BSR) & BSR_BANK_MASK));
 944
 945         val = smc_read_2(sc, MGMT);
 946         smc_barrier(sc, MGMT, 2,
 947             BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
 948
 949         return (val);
 950 }
 951
 952 static void
 953 smc_mii_bitbang_write(device_t dev, uint32_t val)
 954 {
 955         struct smc_softc        *sc;
 956
 957         sc = device_get_softc(dev);
 958
 959         SMC_ASSERT_LOCKED(sc);
 960         KASSERT((smc_read_2(sc, BSR) & BSR_BANK_MASK) == 3,
 961             ("%s: smc_mii_bitbang_write called with bank %d (!= 3)",
 962             device_get_nameunit(sc->smc_dev),
 963             smc_read_2(sc, BSR) & BSR_BANK_MASK));
 964
 965         smc_write_2(sc, MGMT, val);
 966         smc_barrier(sc, MGMT, 2,
 967             BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
 968 }
 969
 970 int
 971 smc_miibus_readreg(device_t dev, int phy, int reg)
 972 {
 973         struct smc_softc        *sc;
 974         int                     val;
 975
 976         sc = device_get_softc(dev);
 977
 978         SMC_LOCK(sc);
 979
 980         smc_select_bank(sc, 3);
 981
 982         val = mii_bitbang_readreg(dev, &smc_mii_bitbang_ops, phy, reg);
 983
 984         SMC_UNLOCK(sc);
 985         return (val);
 986 }
 987
 988 int
 989 smc_miibus_writereg(device_t dev, int phy, int reg, int data)
 990 {
 991         struct smc_softc        *sc;
 992
 993         sc = device_get_softc(dev);
 994
 995         SMC_LOCK(sc);
 996
 997         smc_select_bank(sc, 3);
 998
 999         mii_bitbang_writereg(dev, &smc_mii_bitbang_ops, phy, reg, data);
1000
1001         SMC_UNLOCK(sc);
1002         return (0);
1003 }
1004
1005 void
1006 smc_miibus_statchg(device_t dev)
1007 {
1008         struct smc_softc        *sc;
1009         struct mii_data         *mii;
1010         uint16_t                tcr;
1011
1012         sc = device_get_softc(dev);
1013         mii = device_get_softc(sc->smc_miibus);
1014
1015         SMC_LOCK(sc);
1016
1017         smc_select_bank(sc, 0);
1018         tcr = smc_read_2(sc, TCR);
1019
1020         if ((IFM_OPTIONS(mii->mii_media_active) & IFM_FDX) != 0)
1021                 tcr |= TCR_SWFDUP;
1022         else
1023                 tcr &= ~TCR_SWFDUP;
1024
1025         smc_write_2(sc, TCR, tcr);
1026
1027         SMC_UNLOCK(sc);
1028 }
1029
1030 static int
1031 smc_mii_ifmedia_upd(struct ifnet *ifp)
1032 {
1033         struct smc_softc        *sc;
1034         struct mii_data         *mii;
1035
1036         sc = ifp->if_softc;
1037         if (sc->smc_miibus == NULL)
1038                 return (ENXIO);
1039
1040         mii = device_get_softc(sc->smc_miibus);
1041         return (mii_mediachg(mii));
1042 }
1043
1044 static void
1045 smc_mii_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
1046 {
1047         struct smc_softc        *sc;
1048         struct mii_data         *mii;
1049
1050         sc = ifp->if_softc;
1051         if (sc->smc_miibus == NULL)
1052                 return;
1053
1054         mii = device_get_softc(sc->smc_miibus);
1055         mii_pollstat(mii);
1056         ifmr->ifm_active = mii->mii_media_active;
1057         ifmr->ifm_status = mii->mii_media_status;
1058 }
1059
1060 static void
1061 smc_mii_tick(void *context)
1062 {
1063         struct smc_softc        *sc;
1064
1065         sc = (struct smc_softc *)context;
1066
1067         if (sc->smc_miibus == NULL)
1068                 return;
1069
1070         SMC_UNLOCK(sc);
1071
1072         mii_tick(device_get_softc(sc->smc_miibus));
1073         callout_reset(&sc->smc_mii_tick_ch, hz, smc_mii_tick, sc);
1074 }
1075
1076 static void
1077 smc_mii_mediachg(struct smc_softc *sc)
1078 {
1079
1080         if (sc->smc_miibus == NULL)
1081                 return;
1082         mii_mediachg(device_get_softc(sc->smc_miibus));
1083 }
1084
1085 static int
1086 smc_mii_mediaioctl(struct smc_softc *sc, struct ifreq *ifr, u_long command)
1087 {
1088         struct mii_data *mii;
1089
1090         if (sc->smc_miibus == NULL)
1091                 return (EINVAL);
1092
1093         mii = device_get_softc(sc->smc_miibus);
1094         return (ifmedia_ioctl(sc->smc_ifp, ifr, &mii->mii_media, command));
1095 }
1096
1097 static void
1098 smc_reset(struct smc_softc *sc)
1099 {
1100         u_int   ctr;
1101
1102         SMC_ASSERT_LOCKED(sc);
1103
1104         smc_select_bank(sc, 2);
1105
1106         /*
1107          * Mask all interrupts.
1108          */
1109         smc_write_1(sc, MSK, 0);
1110
1111         /*
1112          * Tell the device to reset.
1113          */
1114         smc_select_bank(sc, 0);
1115         smc_write_2(sc, RCR, RCR_SOFT_RST);
1116
1117         /*
1118          * Set up the configuration register.
1119          */
1120         smc_select_bank(sc, 1);
1121         smc_write_2(sc, CR, CR_EPH_POWER_EN);
1122         DELAY(1);
1123
1124         /*
1125          * Turn off transmit and receive.
1126          */
1127         smc_select_bank(sc, 0);
1128         smc_write_2(sc, TCR, 0);
1129         smc_write_2(sc, RCR, 0);
1130
1131         /*
1132          * Set up the control register.
1133          */
1134         smc_select_bank(sc, 1);
1135         ctr = smc_read_2(sc, CTR);
1136         ctr |= CTR_LE_ENABLE | CTR_AUTO_RELEASE;
1137         smc_write_2(sc, CTR, ctr);
1138
1139         /*
1140          * Reset the MMU.
1141          */
1142         smc_select_bank(sc, 2);
1143         smc_mmu_wait(sc);
1144         smc_write_2(sc, MMUCR, MMUCR_CMD_MMU_RESET);
1145 }
1146
1147 static void
1148 smc_enable(struct smc_softc *sc)
1149 {
1150         struct ifnet            *ifp;
1151
1152         SMC_ASSERT_LOCKED(sc);
1153         ifp = sc->smc_ifp;
1154
1155         /*
1156          * Set up the receive/PHY control register.
1157          */
1158         smc_select_bank(sc, 0);
1159         smc_write_2(sc, RPCR, RPCR_ANEG | (RPCR_LED_LINK_ANY << RPCR_LSA_SHIFT)
1160             | (RPCR_LED_ACT_ANY << RPCR_LSB_SHIFT));
1161
1162         /*
1163          * Set up the transmit and receive control registers.
1164          */
1165         smc_write_2(sc, TCR, TCR_TXENA | TCR_PAD_EN);
1166         smc_write_2(sc, RCR, RCR_RXEN | RCR_STRIP_CRC);
1167
1168         /*
1169          * Set up the interrupt mask.
1170          */
1171         smc_select_bank(sc, 2);
1172         sc->smc_mask = EPH_INT | RX_OVRN_INT | RCV_INT | TX_INT;
1173         if ((ifp->if_capenable & IFCAP_POLLING) != 0)
1174                 smc_write_1(sc, MSK, sc->smc_mask);
1175 }
1176
1177 static void
1178 smc_stop(struct smc_softc *sc)
1179 {
1180
1181         SMC_ASSERT_LOCKED(sc);
1182
1183         /*
1184          * Turn off callouts.
1185          */
1186         callout_stop(&sc->smc_watchdog);
1187         callout_stop(&sc->smc_mii_tick_ch);
1188
1189         /*
1190          * Mask all interrupts.
1191          */
1192         smc_select_bank(sc, 2);
1193         sc->smc_mask = 0;
1194         smc_write_1(sc, MSK, 0);
1195 #ifdef DEVICE_POLLING
1196         ether_poll_deregister(sc->smc_ifp);
1197         sc->smc_ifp->if_capenable &= ~IFCAP_POLLING;
1198         sc->smc_ifp->if_capenable &= ~IFCAP_POLLING_NOCOUNT;
1199 #endif
1200
1201         /*
1202          * Disable transmit and receive.
1203          */
1204         smc_select_bank(sc, 0);
1205         smc_write_2(sc, TCR, 0);
1206         smc_write_2(sc, RCR, 0);
1207
1208         sc->smc_ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1209 }
1210
1211 static void
1212 smc_watchdog(void *arg)
1213 {
1214         struct smc_softc        *sc;
1215
1216         sc = (struct smc_softc *)arg;
1217         device_printf(sc->smc_dev, "watchdog timeout\n");
1218         taskqueue_enqueue_fast(sc->smc_tq, &sc->smc_intr);
1219 }
1220
1221 static void
1222 smc_init(void *context)
1223 {
1224         struct smc_softc        *sc;
1225
1226         sc = (struct smc_softc *)context;
1227         SMC_LOCK(sc);
1228         smc_init_locked(sc);
1229         SMC_UNLOCK(sc);
1230 }
1231
1232 static void
1233 smc_init_locked(struct smc_softc *sc)
1234 {
1235         struct ifnet    *ifp;
1236
1237         SMC_ASSERT_LOCKED(sc);
1238         ifp = sc->smc_ifp;
1239         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
1240                 return;
1241
1242         smc_reset(sc);
1243         smc_enable(sc);
1244
1245         ifp->if_drv_flags |= IFF_DRV_RUNNING;
1246         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
1247
1248         smc_start_locked(ifp);
1249
1250         if (sc->smc_mii_tick != NULL)
1251                 callout_reset(&sc->smc_mii_tick_ch, hz, sc->smc_mii_tick, sc);
1252
1253 #ifdef DEVICE_POLLING
1254         SMC_UNLOCK(sc);
1255         ether_poll_register(smc_poll, ifp);
1256         SMC_LOCK(sc);
1257         ifp->if_capenable |= IFCAP_POLLING;
1258         ifp->if_capenable |= IFCAP_POLLING_NOCOUNT;
1259 #endif
1260 }
1261
1262 static int
1263 smc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1264 {
1265         struct smc_softc        *sc;
1266         int                     error;
1267
1268         sc = ifp->if_softc;
1269         error = 0;
1270
1271         switch (cmd) {
1272         case SIOCSIFFLAGS:
1273                 if ((ifp->if_flags & IFF_UP) == 0 &&
1274                     (ifp->if_drv_flags & IFF_DRV_RUNNING) != 0) {
1275                         SMC_LOCK(sc);
1276                         smc_stop(sc);
1277                         SMC_UNLOCK(sc);
1278                 } else {
1279                         smc_init(sc);
1280                         if (sc->smc_mii_mediachg != NULL)
1281                                 sc->smc_mii_mediachg(sc);
1282                 }
1283                 break;
1284
1285         case SIOCADDMULTI:
1286         case SIOCDELMULTI:
1287                 /* XXX
1288                 SMC_LOCK(sc);
1289                 smc_setmcast(sc);
1290                 SMC_UNLOCK(sc);
1291                 */
1292                 error = EINVAL;
1293                 break;
1294
1295         case SIOCGIFMEDIA:
1296         case SIOCSIFMEDIA:
1297                 if (sc->smc_mii_mediaioctl == NULL) {
1298                         error = EINVAL;
1299                         break;
1300                 }
1301                 sc->smc_mii_mediaioctl(sc, (struct ifreq *)data, cmd);
1302                 break;
1303
1304         default:
1305                 error = ether_ioctl(ifp, cmd, data);
1306                 break;
1307         }
1308
1309         return (error);
1310 }