sys/dev/raid/twe/twe_freebsd.c

   1 /*-
   2  * Copyright (c) 2000 Michael Smith
   3  * Copyright (c) 2003 Paul Saab
   4  * Copyright (c) 2003 Vinod Kashyap
   5  * Copyright (c) 2000 BSDi
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/sys/dev/twe/twe_freebsd.c,v 1.2.2.9 2004/06/11 18:57:31 vkashyap Exp $
  30  */
  31
  32 /*
  33  * FreeBSD-specific code.
  34  */
  35
  36 #include <dev/raid/twe/twe_compat.h>
  37 #include <dev/raid/twe/twereg.h>
  38 #include <dev/raid/twe/twe_tables.h>
  39 #include <dev/raid/twe/tweio.h>
  40 #include <dev/raid/twe/twevar.h>
  41 #include <sys/dtype.h>
  42
  43 static devclass_t       twe_devclass;
  44
  45 #ifdef TWE_DEBUG
  46 static u_int32_t        twed_bio_in;
  47 #define TWED_BIO_IN     twed_bio_in++
  48 static u_int32_t        twed_bio_out;
  49 #define TWED_BIO_OUT    twed_bio_out++
  50 #else
  51 #define TWED_BIO_IN
  52 #define TWED_BIO_OUT
  53 #endif
  54
  55 /********************************************************************************
  56  ********************************************************************************
  57                                                          Control device interface
  58  ********************************************************************************
  59  ********************************************************************************/
  60
  61 static  d_open_t                twe_open;
  62 static  d_close_t               twe_close;
  63 static  d_ioctl_t               twe_ioctl_wrapper;
  64
  65 static struct dev_ops twe_ops = {
  66         { "twe", 0, 0 },
  67         .d_open =       twe_open,
  68         .d_close =      twe_close,
  69         .d_ioctl =      twe_ioctl_wrapper,
  70 };
  71
  72 /********************************************************************************
  73  * Accept an open operation on the control device.
  74  */
  75 static int
  76 twe_open(struct dev_open_args *ap)
  77 {
  78     cdev_t dev = ap->a_head.a_dev;
  79     int                 unit = minor(dev);
  80     struct twe_softc    *sc = devclass_get_softc(twe_devclass, unit);
  81
  82     sc->twe_state |= TWE_STATE_OPEN;
  83     return(0);
  84 }
  85
  86 /********************************************************************************
  87  * Accept the last close on the control device.
  88  */
  89 static int
  90 twe_close(struct dev_close_args *ap)
  91 {
  92     cdev_t dev = ap->a_head.a_dev;
  93     int                 unit = minor(dev);
  94     struct twe_softc    *sc = devclass_get_softc(twe_devclass, unit);
  95
  96     sc->twe_state &= ~TWE_STATE_OPEN;
  97     return (0);
  98 }
  99
 100 /********************************************************************************
 101  * Handle controller-specific control operations.
 102  */
 103 static int
 104 twe_ioctl_wrapper(struct dev_ioctl_args *ap)
 105 {
 106     cdev_t dev = ap->a_head.a_dev;
 107     struct twe_softc *sc = (struct twe_softc *)dev->si_drv1;
 108
 109     return(twe_ioctl(sc, ap->a_cmd, ap->a_data));
 110 }
 111
 112 /********************************************************************************
 113  ********************************************************************************
 114                                                              PCI device interface
 115  ********************************************************************************
 116  ********************************************************************************/
 117
 118 static int      twe_probe(device_t dev);
 119 static int      twe_attach(device_t dev);
 120 static void     twe_free(struct twe_softc *sc);
 121 static int      twe_detach(device_t dev);
 122 static int      twe_shutdown(device_t dev);
 123 static int      twe_suspend(device_t dev);
 124 static int      twe_resume(device_t dev);
 125 static void     twe_pci_intr(void *arg);
 126 static void     twe_intrhook(void *arg);
 127 static void     twe_free_request(struct twe_request *tr);
 128 static void     twe_setup_data_dmamap(void *arg, bus_dma_segment_t *segs,
 129                                                                   int nsegments, int error);
 130 static void     twe_setup_request_dmamap(void *arg, bus_dma_segment_t *segs,
 131                                                                          int nsegments, int error);
 132
 133 static device_method_t twe_methods[] = {
 134     /* Device interface */
 135     DEVMETHOD(device_probe,     twe_probe),
 136     DEVMETHOD(device_attach,    twe_attach),
 137     DEVMETHOD(device_detach,    twe_detach),
 138     DEVMETHOD(device_shutdown,  twe_shutdown),
 139     DEVMETHOD(device_suspend,   twe_suspend),
 140     DEVMETHOD(device_resume,    twe_resume),
 141
 142     DEVMETHOD(bus_print_child,  bus_generic_print_child),
 143     DEVMETHOD(bus_driver_added, bus_generic_driver_added),
 144     { 0, 0 }
 145 };
 146
 147 static driver_t twe_pci_driver = {
 148         "twe",
 149         twe_methods,
 150         sizeof(struct twe_softc)
 151 };
 152
 153 #ifdef TWE_OVERRIDE
 154 DRIVER_MODULE(Xtwe, pci, twe_pci_driver, twe_devclass, 0, 0);
 155 #else
 156 DRIVER_MODULE(twe, pci, twe_pci_driver, twe_devclass, 0, 0);
 157 #endif
 158
 159 /********************************************************************************
 160  * Match a 3ware Escalade ATA RAID controller.
 161  */
 162 static int
 163 twe_probe(device_t dev)
 164 {
 165
 166     debug_called(4);
 167
 168     if ((pci_get_vendor(dev) == TWE_VENDOR_ID) &&
 169         ((pci_get_device(dev) == TWE_DEVICE_ID) ||
 170          (pci_get_device(dev) == TWE_DEVICE_ID_ASIC))) {
 171         device_set_desc(dev, TWE_DEVICE_NAME " driver ver. " TWE_DRIVER_VERSION_STRING);
 172 #ifdef TWE_OVERRIDE
 173         return(0);
 174 #else
 175         return(-10);
 176 #endif
 177     }
 178     return(ENXIO);
 179 }
 180
 181 /********************************************************************************
 182  * Allocate resources, initialise the controller.
 183  */
 184 static int
 185 twe_attach(device_t dev)
 186 {
 187     struct twe_softc    *sc;
 188     int                 rid, error;
 189     u_int32_t           command;
 190
 191     debug_called(4);
 192
 193     /*
 194      * Initialise the softc structure.
 195      */
 196     sc = device_get_softc(dev);
 197     sc->twe_dev = dev;
 198
 199     sysctl_ctx_init(&sc->sysctl_ctx);
 200     sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 201         SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO,
 202         device_get_nameunit(dev), CTLFLAG_RD, 0, "");
 203     if (sc->sysctl_tree == NULL) {
 204         twe_printf(sc, "cannot add sysctl tree node\n");
 205         return (ENXIO);
 206     }
 207     SYSCTL_ADD_STRING(&sc->sysctl_ctx, SYSCTL_CHILDREN(sc->sysctl_tree),
 208         OID_AUTO, "driver_version", CTLFLAG_RD, TWE_DRIVER_VERSION_STRING, 0,
 209         "TWE driver version");
 210
 211     /*
 212      * Make sure we are going to be able to talk to this board.
 213      */
 214     command = pci_read_config(dev, PCIR_COMMAND, 2);
 215     if ((command & PCIM_CMD_PORTEN) == 0) {
 216         twe_printf(sc, "register window not available\n");
 217         return(ENXIO);
 218     }
 219     /*
 220      * Force the busmaster enable bit on, in case the BIOS forgot.
 221      */
 222     command |= PCIM_CMD_BUSMASTEREN;
 223     pci_write_config(dev, PCIR_COMMAND, command, 2);
 224
 225     /*
 226      * Allocate the PCI register window.
 227      */
 228     rid = TWE_IO_CONFIG_REG;
 229     if ((sc->twe_io = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, 1, RF_ACTIVE)) == NULL) {
 230         twe_printf(sc, "can't allocate register window\n");
 231         twe_free(sc);
 232         return(ENXIO);
 233     }
 234     sc->twe_btag = rman_get_bustag(sc->twe_io);
 235     sc->twe_bhandle = rman_get_bushandle(sc->twe_io);
 236
 237     /*
 238      * Allocate the parent bus DMA tag appropriate for PCI.
 239      */
 240     if (bus_dma_tag_create(NULL,                                /* parent */
 241                            1, 0,                                /* alignment, boundary */
 242                            BUS_SPACE_MAXADDR_32BIT,             /* lowaddr */
 243                            BUS_SPACE_MAXADDR,                   /* highaddr */
 244                            NULL, NULL,                          /* filter, filterarg */
 245                            MAXBSIZE, TWE_MAX_SGL_LENGTH,        /* maxsize, nsegments */
 246                            BUS_SPACE_MAXSIZE_32BIT,             /* maxsegsize */
 247                            BUS_DMA_ALLOCNOW,                    /* flags */
 248                            &sc->twe_parent_dmat)) {
 249         twe_printf(sc, "can't allocate parent DMA tag\n");
 250         twe_free(sc);
 251         return(ENOMEM);
 252     }
 253
 254     /*
 255      * Allocate and connect our interrupt.
 256      */
 257     rid = 0;
 258     if ((sc->twe_irq = bus_alloc_resource(sc->twe_dev, SYS_RES_IRQ, &rid, 0, ~0, 1, RF_SHAREABLE | RF_ACTIVE)) == NULL) {
 259         twe_printf(sc, "can't allocate interrupt\n");
 260         twe_free(sc);
 261         return(ENXIO);
 262     }
 263     if (bus_setup_intr(sc->twe_dev, sc->twe_irq, 0,
 264                         twe_pci_intr, sc, &sc->twe_intr, NULL)) {
 265         twe_printf(sc, "can't set up interrupt\n");
 266         twe_free(sc);
 267         return(ENXIO);
 268     }
 269
 270     /*
 271      * Create DMA tag for mapping objects into controller-addressable space.
 272      */
 273     if (bus_dma_tag_create(sc->twe_parent_dmat,         /* parent */
 274                            1, 0,                        /* alignment, boundary */
 275                            BUS_SPACE_MAXADDR,           /* lowaddr */
 276                            BUS_SPACE_MAXADDR,           /* highaddr */
 277                            NULL, NULL,                  /* filter, filterarg */
 278                            MAXBSIZE, TWE_MAX_SGL_LENGTH,/* maxsize, nsegments */
 279                            BUS_SPACE_MAXSIZE_32BIT,     /* maxsegsize */
 280                            0,                           /* flags */
 281                            &sc->twe_buffer_dmat)) {
 282         twe_printf(sc, "can't allocate data buffer DMA tag\n");
 283         twe_free(sc);
 284         return(ENOMEM);
 285     }
 286
 287     /*
 288      * Initialise the controller and driver core.
 289      */
 290     if ((error = twe_setup(sc))) {
 291         twe_free(sc);
 292         return(error);
 293     }
 294
 295     /*
 296      * Print some information about the controller and configuration.
 297      */
 298     twe_describe_controller(sc);
 299
 300     /*
 301      * Create the control device.
 302      */
 303     sc->twe_dev_t = make_dev(&twe_ops, device_get_unit(sc->twe_dev),
 304                              UID_ROOT, GID_OPERATOR,
 305                              S_IRUSR | S_IWUSR, "twe%d",
 306                              device_get_unit(sc->twe_dev));
 307     sc->twe_dev_t->si_drv1 = sc;
 308
 309     /*
 310      * Schedule ourselves to bring the controller up once interrupts are
 311      * available.  This isn't strictly necessary, since we disable
 312      * interrupts while probing the controller, but it is more in keeping
 313      * with common practice for other disk devices.
 314      */
 315     sc->twe_ich.ich_func = twe_intrhook;
 316     sc->twe_ich.ich_arg = sc;
 317     if (config_intrhook_establish(&sc->twe_ich) != 0) {
 318         twe_printf(sc, "can't establish configuration hook\n");
 319         twe_free(sc);
 320         return(ENXIO);
 321     }
 322
 323     return(0);
 324 }
 325
 326 /********************************************************************************
 327  * Free all of the resources associated with (sc).
 328  *
 329  * Should not be called if the controller is active.
 330  */
 331 static void
 332 twe_free(struct twe_softc *sc)
 333 {
 334     struct twe_request  *tr;
 335
 336     debug_called(4);
 337
 338     /* throw away any command buffers */
 339     while ((tr = twe_dequeue_free(sc)) != NULL)
 340         twe_free_request(tr);
 341
 342     /* destroy the data-transfer DMA tag */
 343     if (sc->twe_buffer_dmat)
 344         bus_dma_tag_destroy(sc->twe_buffer_dmat);
 345
 346     /* disconnect the interrupt handler */
 347     if (sc->twe_intr)
 348         bus_teardown_intr(sc->twe_dev, sc->twe_irq, sc->twe_intr);
 349     if (sc->twe_irq != NULL)
 350         bus_release_resource(sc->twe_dev, SYS_RES_IRQ, 0, sc->twe_irq);
 351
 352     /* destroy the parent DMA tag */
 353     if (sc->twe_parent_dmat)
 354         bus_dma_tag_destroy(sc->twe_parent_dmat);
 355
 356     /* release the register window mapping */
 357     if (sc->twe_io != NULL)
 358         bus_release_resource(sc->twe_dev, SYS_RES_IOPORT, TWE_IO_CONFIG_REG, sc->twe_io);
 359
 360     dev_ops_remove_minor(&twe_ops, device_get_unit(sc->twe_dev));
 361
 362     /* destroy control device */
 363     if (sc->twe_dev_t != (cdev_t)NULL)
 364         destroy_dev(sc->twe_dev_t);
 365
 366     sysctl_ctx_free(&sc->sysctl_ctx);
 367 }
 368
 369 /********************************************************************************
 370  * Disconnect from the controller completely, in preparation for unload.
 371  */
 372 static int
 373 twe_detach(device_t dev)
 374 {
 375     struct twe_softc    *sc = device_get_softc(dev);
 376     int                 error;
 377
 378     debug_called(4);
 379
 380     error = EBUSY;
 381     crit_enter();
 382     if (sc->twe_state & TWE_STATE_OPEN)
 383         goto out;
 384
 385     /*
 386      * Shut the controller down.
 387      */
 388     if ((error = twe_shutdown(dev)))
 389         goto out;
 390
 391     twe_free(sc);
 392
 393     error = 0;
 394  out:
 395     crit_exit();
 396     return(error);
 397 }
 398
 399 /********************************************************************************
 400  * Bring the controller down to a dormant state and detach all child devices.
 401  *
 402  * Note that we can assume that the bioq on the controller is empty, as we won't
 403  * allow shutdown if any device is open.
 404  */
 405 static int
 406 twe_shutdown(device_t dev)
 407 {
 408     struct twe_softc    *sc = device_get_softc(dev);
 409     int                 i, error = 0;
 410
 411     debug_called(4);
 412
 413     crit_enter();
 414
 415     /*
 416      * Delete all our child devices.
 417      */
 418     for (i = 0; i < TWE_MAX_UNITS; i++) {
 419       if (sc->twe_drive[i].td_disk != 0)
 420         if ((error = twe_detach_drive(sc, i)) != 0)
 421             goto out;
 422     }
 423
 424     /*
 425      * Bring the controller down.
 426      */
 427     twe_deinit(sc);
 428
 429  out:
 430     crit_exit();
 431     return(error);
 432 }
 433
 434 /********************************************************************************
 435  * Bring the controller to a quiescent state, ready for system suspend.
 436  */
 437 static int
 438 twe_suspend(device_t dev)
 439 {
 440     struct twe_softc    *sc = device_get_softc(dev);
 441
 442     debug_called(4);
 443
 444     crit_enter();
 445     sc->twe_state |= TWE_STATE_SUSPEND;
 446
 447     twe_disable_interrupts(sc);
 448     crit_exit();
 449
 450     return(0);
 451 }
 452
 453 /********************************************************************************
 454  * Bring the controller back to a state ready for operation.
 455  */
 456 static int
 457 twe_resume(device_t dev)
 458 {
 459     struct twe_softc    *sc = device_get_softc(dev);
 460
 461     debug_called(4);
 462
 463     sc->twe_state &= ~TWE_STATE_SUSPEND;
 464     twe_enable_interrupts(sc);
 465
 466     return(0);
 467 }
 468
 469 /*******************************************************************************
 470  * Take an interrupt, or be poked by other code to look for interrupt-worthy
 471  * status.
 472  */
 473 static void
 474 twe_pci_intr(void *arg)
 475 {
 476     twe_intr((struct twe_softc *)arg);
 477 }
 478
 479 /********************************************************************************
 480  * Delayed-startup hook
 481  */
 482 static void
 483 twe_intrhook(void *arg)
 484 {
 485     struct twe_softc            *sc = (struct twe_softc *)arg;
 486
 487     /* pull ourselves off the intrhook chain */
 488     config_intrhook_disestablish(&sc->twe_ich);
 489
 490     /* call core startup routine */
 491     twe_init(sc);
 492 }
 493
 494 /********************************************************************************
 495  * Given a detected drive, attach it to the bio interface.
 496  *
 497  * This is called from twe_add_unit.
 498  */
 499 int
 500 twe_attach_drive(struct twe_softc *sc, struct twe_drive *dr)
 501 {
 502     char        buf[80];
 503     int         error = 0;
 504
 505     dr->td_disk =  device_add_child(sc->twe_dev, NULL, -1);
 506     if (dr->td_disk == NULL) {
 507         twe_printf(sc, "Cannot add unit\n");
 508         return (EIO);
 509     }
 510     device_set_ivars(dr->td_disk, dr);
 511
 512     /*
 513      * XXX It would make sense to test the online/initialising bits, but they seem to be
 514      * always set...
 515      */
 516     ksprintf(buf, "Unit %d, %s, %s",
 517             dr->td_twe_unit,
 518             twe_describe_code(twe_table_unittype, dr->td_type),
 519             twe_describe_code(twe_table_unitstate, dr->td_state & TWE_PARAM_UNITSTATUS_MASK));
 520     device_set_desc_copy(dr->td_disk, buf);
 521
 522     if ((error = bus_generic_attach(sc->twe_dev)) != 0) {
 523         twe_printf(sc, "Cannot attach unit to controller. error = %d\n", error);
 524         error = EIO;
 525     }
 526     return (error);
 527 }
 528
 529 /********************************************************************************
 530  * Detach the specified unit if it exsists
 531  *
 532  * This is called from twe_del_unit.
 533  */
 534 int
 535 twe_detach_drive(struct twe_softc *sc, int unit)
 536 {
 537     int error = 0;
 538
 539     if ((error = device_delete_child(sc->twe_dev, sc->twe_drive[unit].td_disk))) {
 540         twe_printf(sc, "Cannot delete unit. error = %d\n", error);
 541         return (error);
 542     }
 543     bzero(&sc->twe_drive[unit], sizeof(sc->twe_drive[unit]));
 544     return (error);
 545 }
 546
 547 /********************************************************************************
 548  * Clear a PCI parity error.
 549  */
 550 void
 551 twe_clear_pci_parity_error(struct twe_softc *sc)
 552 {
 553     TWE_CONTROL(sc, TWE_CONTROL_CLEAR_PARITY_ERROR);
 554     pci_write_config(sc->twe_dev, PCIR_STATUS, TWE_PCI_CLEAR_PARITY_ERROR, 2);
 555 }
 556
 557 /********************************************************************************
 558  * Clear a PCI abort.
 559  */
 560 void
 561 twe_clear_pci_abort(struct twe_softc *sc)
 562 {
 563     TWE_CONTROL(sc, TWE_CONTROL_CLEAR_PCI_ABORT);
 564     pci_write_config(sc->twe_dev, PCIR_STATUS, TWE_PCI_CLEAR_PCI_ABORT, 2);
 565 }
 566
 567 /********************************************************************************
 568  ********************************************************************************
 569                                                                       Disk device
 570  ********************************************************************************
 571  ********************************************************************************/
 572
 573 /*
 574  * Disk device bus interface
 575  */
 576 static int twed_probe(device_t dev);
 577 static int twed_attach(device_t dev);
 578 static int twed_detach(device_t dev);
 579
 580 static device_method_t twed_methods[] = {
 581     DEVMETHOD(device_probe,     twed_probe),
 582     DEVMETHOD(device_attach,    twed_attach),
 583     DEVMETHOD(device_detach,    twed_detach),
 584     { 0, 0 }
 585 };
 586
 587 static driver_t twed_driver = {
 588     "twed",
 589     twed_methods,
 590     sizeof(struct twed_softc)
 591 };
 592
 593 static devclass_t       twed_devclass;
 594 #ifdef TWE_OVERRIDE
 595 DRIVER_MODULE(Xtwed, Xtwe, twed_driver, twed_devclass, 0, 0);
 596 #else
 597 DRIVER_MODULE(twed, twe, twed_driver, twed_devclass, 0, 0);
 598 #endif
 599
 600 /*
 601  * Disk device control interface.
 602  */
 603 static  d_open_t        twed_open;
 604 static  d_close_t       twed_close;
 605 static  d_strategy_t    twed_strategy;
 606 static  d_dump_t        twed_dump;
 607
 608 static struct dev_ops twed_ops = {
 609         { "twed", 0, D_DISK },
 610         .d_open =       twed_open,
 611         .d_close =      twed_close,
 612         .d_read =       physread,
 613         .d_write =      physwrite,
 614         .d_strategy =   twed_strategy,
 615         .d_dump =       twed_dump,
 616 };
 617
 618 #ifdef FREEBSD_4
 619 static int              disks_registered = 0;
 620 #endif
 621
 622 /********************************************************************************
 623  * Handle open from generic layer.
 624  *
 625  * Note that this is typically only called by the diskslice code, and not
 626  * for opens on subdevices (eg. slices, partitions).
 627  */
 628 static int
 629 twed_open(struct dev_open_args *ap)
 630 {
 631     cdev_t dev = ap->a_head.a_dev;
 632     struct twed_softc   *sc = (struct twed_softc *)dev->si_drv1;
 633
 634     debug_called(4);
 635
 636     if (sc == NULL)
 637         return (ENXIO);
 638
 639     /* check that the controller is up and running */
 640     if (sc->twed_controller->twe_state & TWE_STATE_SHUTDOWN)
 641         return(ENXIO);
 642 #if 0
 643     /* build disk info */
 644     bzero(&info, sizeof(info));
 645     info.d_media_blksize    = TWE_BLOCK_SIZE;   /* mandatory */
 646     info.d_media_blocks     = sc->twed_drive->td_size;
 647
 648     info.d_type         = DTYPE_ESDI;           /* optional */
 649     info.d_secpertrack  = sc->twed_drive->td_sectors;
 650     info.d_nheads       = sc->twed_drive->td_heads;
 651     info.d_ncylinders   = sc->twed_drive->td_cylinders;
 652     info.d_secpercyl    = sc->twed_drive->td_sectors * sc->twed_drive->td_heads;
 653
 654     disk_setdiskinfo(&sc->twed_disk, &info);
 655 #endif
 656     sc->twed_flags |= TWED_OPEN;
 657     return (0);
 658 }
 659
 660 /********************************************************************************
 661  * Handle last close of the disk device.
 662  */
 663 static int
 664 twed_close(struct dev_close_args *ap)
 665 {
 666     cdev_t dev = ap->a_head.a_dev;
 667     struct twed_softc   *sc = (struct twed_softc *)dev->si_drv1;
 668
 669     debug_called(4);
 670
 671     if (sc == NULL)
 672         return (ENXIO);
 673
 674     sc->twed_flags &= ~TWED_OPEN;
 675     return (0);
 676 }
 677
 678 /********************************************************************************
 679  * Handle an I/O request.
 680  */
 681 static int
 682 twed_strategy(struct dev_strategy_args *ap)
 683 {
 684     cdev_t dev = ap->a_head.a_dev;
 685     struct bio *bio = ap->a_bio;
 686     struct twed_softc *sc = dev->si_drv1;
 687     struct buf *bp = bio->bio_buf;
 688
 689     bio->bio_driver_info = sc;
 690
 691     debug_called(4);
 692
 693     TWED_BIO_IN;
 694
 695     /* bogus disk? */
 696     if ((sc == NULL) || (!sc->twed_drive->td_disk)) {
 697         bp->b_error = EINVAL;
 698         bp->b_flags |= B_ERROR;
 699         kprintf("twe: bio for invalid disk!\n");
 700         biodone(bio);
 701         TWED_BIO_OUT;
 702         return(0);
 703     }
 704
 705     /* perform accounting */
 706     devstat_start_transaction(&sc->twed_stats);
 707
 708     /* queue the bio on the controller */
 709     twe_enqueue_bio(sc->twed_controller, bio);
 710
 711     /* poke the controller to start I/O */
 712     twe_startio(sc->twed_controller);
 713     return(0);
 714 }
 715
 716 /********************************************************************************
 717  * System crashdump support
 718  */
 719 static int
 720 twed_dump(struct dev_dump_args *ap)
 721 {
 722     cdev_t dev = ap->a_head.a_dev;
 723     struct twed_softc   *twed_sc = (struct twed_softc *)dev->si_drv1;
 724     struct twe_softc    *twe_sc  = (struct twe_softc *)twed_sc->twed_controller;
 725     int                 error;
 726
 727     if (!twed_sc || !twe_sc)
 728         return(ENXIO);
 729
 730     if (ap->a_length > 0) {
 731         if ((error = twe_dump_blocks(twe_sc, twed_sc->twed_drive->td_twe_unit,
 732                                      ap->a_offset / TWE_BLOCK_SIZE,
 733                                      ap->a_virtual, ap->a_length / TWE_BLOCK_SIZE)) != 0)
 734             return(error);
 735     }
 736     return(0);
 737 }
 738
 739 /********************************************************************************
 740  * Handle completion of an I/O request.
 741  */
 742 void
 743 twed_intr(struct bio *bio)
 744 {
 745     struct buf *bp = bio->bio_buf;
 746     struct twed_softc *sc = bio->bio_driver_info;
 747     debug_called(4);
 748
 749     /* if no error, transfer completed */
 750     if ((bp->b_flags & B_ERROR) == 0)
 751         bp->b_resid = 0;
 752     devstat_end_transaction_buf(&sc->twed_stats, bp);
 753     biodone(bio);
 754     TWED_BIO_OUT;
 755 }
 756
 757 /********************************************************************************
 758  * Default probe stub.
 759  */
 760 static int
 761 twed_probe(device_t dev)
 762 {
 763     return (0);
 764 }
 765
 766 /********************************************************************************
 767  * Attach a unit to the controller.
 768  */
 769 static int
 770 twed_attach(device_t dev)
 771 {
 772     struct twed_softc   *sc;
 773         struct disk_info info;
 774     device_t            parent;
 775     cdev_t              dsk;
 776
 777     debug_called(4);
 778
 779     /* initialise our softc */
 780     sc = device_get_softc(dev);
 781     parent = device_get_parent(dev);
 782     sc->twed_controller = (struct twe_softc *)device_get_softc(parent);
 783     sc->twed_drive = device_get_ivars(dev);
 784     sc->twed_drive->td_sys_unit = device_get_unit(dev);
 785     sc->twed_dev = dev;
 786
 787     /* report the drive */
 788     twed_printf(sc, "%uMB (%u sectors)\n",
 789                 sc->twed_drive->td_size / ((1024 * 1024) / TWE_BLOCK_SIZE),
 790                 sc->twed_drive->td_size);
 791
 792     devstat_add_entry(&sc->twed_stats, "twed", sc->twed_drive->td_sys_unit,
 793                         TWE_BLOCK_SIZE,
 794                         DEVSTAT_NO_ORDERED_TAGS,
 795                         DEVSTAT_TYPE_STORARRAY | DEVSTAT_TYPE_IF_OTHER,
 796                         DEVSTAT_PRIORITY_ARRAY);
 797
 798     /* attach a generic disk device to ourselves */
 799     dsk = disk_create(sc->twed_drive->td_sys_unit, &sc->twed_disk, &twed_ops);
 800     dsk->si_drv1 = sc;
 801 /*    dsk->si_drv2 = sc->twed_drive;*/
 802     sc->twed_dev_t = dsk;
 803 #ifdef FREEBSD_4
 804     disks_registered++;
 805 #endif
 806
 807     /* set the maximum I/O size to the theoretical maximum allowed by the S/G list size */
 808     dsk->si_iosize_max = (TWE_MAX_SGL_LENGTH - 1) * PAGE_SIZE;
 809
 810         /*
 811          * Set disk info, as it appears that all needed data is available already.
 812          * Setting the disk info will also cause the probing to start.
 813          */
 814     bzero(&info, sizeof(info));
 815     info.d_media_blksize    = TWE_BLOCK_SIZE;   /* mandatory */
 816     info.d_media_blocks     = sc->twed_drive->td_size;
 817
 818     info.d_type         = DTYPE_ESDI;           /* optional */
 819     info.d_secpertrack  = sc->twed_drive->td_sectors;
 820     info.d_nheads       = sc->twed_drive->td_heads;
 821     info.d_ncylinders   = sc->twed_drive->td_cylinders;
 822     info.d_secpercyl    = sc->twed_drive->td_sectors * sc->twed_drive->td_heads;
 823
 824     disk_setdiskinfo(&sc->twed_disk, &info);
 825
 826     return (0);
 827 }
 828
 829 /********************************************************************************
 830  * Disconnect ourselves from the system.
 831  */
 832 static int
 833 twed_detach(device_t dev)
 834 {
 835     struct twed_softc *sc = (struct twed_softc *)device_get_softc(dev);
 836
 837     debug_called(4);
 838
 839     if (sc->twed_flags & TWED_OPEN)
 840         return(EBUSY);
 841
 842     devstat_remove_entry(&sc->twed_stats);
 843     disk_destroy(&sc->twed_disk);
 844 #ifdef FREEBSD_4
 845         kprintf("Disks registered: %d\n", disks_registered);
 846 #if 0
 847     if (--disks_registered == 0)
 848         dev_ops_remove_all(&tweddisk_ops);
 849 #endif
 850 #endif
 851
 852     return(0);
 853 }
 854
 855 /********************************************************************************
 856  ********************************************************************************
 857                                                                              Misc
 858  ********************************************************************************
 859  ********************************************************************************/
 860
 861 MALLOC_DEFINE(TWE_MALLOC_CLASS, "twe commands", "twe commands");
 862 /********************************************************************************
 863  * Allocate a command buffer
 864  */
 865 struct twe_request *
 866 twe_allocate_request(struct twe_softc *sc)
 867 {
 868     struct twe_request  *tr;
 869         int aligned_size;
 870
 871     /*
 872      * TWE requires requests to be 512-byte aligned.  Depend on malloc()
 873      * guarenteeing alignment for power-of-2 requests.  Note that the old
 874      * (FreeBSD-4.x) malloc code aligned all requests, but the new slab
 875      * allocator only guarentees same-size alignment for power-of-2 requests.
 876      */
 877     aligned_size = (sizeof(struct twe_request) + TWE_ALIGNMASK) &
 878            ~TWE_ALIGNMASK;
 879     tr = kmalloc(aligned_size, TWE_MALLOC_CLASS, M_INTWAIT|M_ZERO);
 880     tr->tr_sc = sc;
 881     if (bus_dmamap_create(sc->twe_buffer_dmat, 0, &tr->tr_cmdmap)) {
 882         twe_free_request(tr);
 883         return(NULL);
 884     }
 885     bus_dmamap_load(sc->twe_buffer_dmat, tr->tr_cmdmap, &tr->tr_command,
 886         sizeof(tr->tr_command), twe_setup_request_dmamap, tr, 0);
 887     if (bus_dmamap_create(sc->twe_buffer_dmat, 0, &tr->tr_dmamap)) {
 888         bus_dmamap_destroy(sc->twe_buffer_dmat, tr->tr_cmdmap);
 889         twe_free_request(tr);
 890         return(NULL);
 891     }
 892     return(tr);
 893 }
 894
 895 /********************************************************************************
 896  * Permanently discard a command buffer.
 897  */
 898 static void
 899 twe_free_request(struct twe_request *tr)
 900 {
 901     struct twe_softc    *sc = tr->tr_sc;
 902
 903     debug_called(4);
 904
 905     bus_dmamap_unload(sc->twe_buffer_dmat, tr->tr_cmdmap);
 906     bus_dmamap_destroy(sc->twe_buffer_dmat, tr->tr_cmdmap);
 907     bus_dmamap_destroy(sc->twe_buffer_dmat, tr->tr_dmamap);
 908     kfree(tr, TWE_MALLOC_CLASS);
 909 }
 910
 911 /********************************************************************************
 912  * Map/unmap (tr)'s command and data in the controller's addressable space.
 913  *
 914  * These routines ensure that the data which the controller is going to try to
 915  * access is actually visible to the controller, in a machine-independant
 916  * fashion.  Due to a hardware limitation, I/O buffers must be 512-byte aligned
 917  * and we take care of that here as well.
 918  */
 919 static void
 920 twe_fillin_sgl(TWE_SG_Entry *sgl, bus_dma_segment_t *segs, int nsegments, int max_sgl)
 921 {
 922     int i;
 923
 924     for (i = 0; i < nsegments; i++) {
 925         sgl[i].address = segs[i].ds_addr;
 926         sgl[i].length = segs[i].ds_len;
 927     }
 928     for (; i < max_sgl; i++) {                          /* XXX necessary? */
 929         sgl[i].address = 0;
 930         sgl[i].length = 0;
 931     }
 932 }
 933
 934 static void
 935 twe_setup_data_dmamap(void *arg, bus_dma_segment_t *segs, int nsegments, int error)
 936 {
 937     struct twe_request  *tr = (struct twe_request *)arg;
 938     TWE_Command         *cmd = &tr->tr_command;
 939
 940     debug_called(4);
 941
 942     if (tr->tr_flags & TWE_CMD_MAPPED)
 943         panic("already mapped command");
 944
 945     tr->tr_flags |= TWE_CMD_MAPPED;
 946
 947     if (tr->tr_flags & TWE_CMD_IN_PROGRESS)
 948         tr->tr_sc->twe_state &= ~TWE_STATE_FRZN;
 949     /* save base of first segment in command (applicable if there only one segment) */
 950     tr->tr_dataphys = segs[0].ds_addr;
 951
 952     /* correct command size for s/g list size */
 953     tr->tr_command.generic.size += 2 * nsegments;
 954
 955     /*
 956      * Due to the fact that parameter and I/O commands have the scatter/gather list in
 957      * different places, we need to determine which sort of command this actually is
 958      * before we can populate it correctly.
 959      */
 960     switch(cmd->generic.opcode) {
 961     case TWE_OP_GET_PARAM:
 962     case TWE_OP_SET_PARAM:
 963         cmd->generic.sgl_offset = 2;
 964         twe_fillin_sgl(&cmd->param.sgl[0], segs, nsegments, TWE_MAX_SGL_LENGTH);
 965         break;
 966     case TWE_OP_READ:
 967     case TWE_OP_WRITE:
 968         cmd->generic.sgl_offset = 3;
 969         twe_fillin_sgl(&cmd->io.sgl[0], segs, nsegments, TWE_MAX_SGL_LENGTH);
 970         break;
 971     case TWE_OP_ATA_PASSTHROUGH:
 972         cmd->generic.sgl_offset = 5;
 973         twe_fillin_sgl(&cmd->ata.sgl[0], segs, nsegments, TWE_MAX_ATA_SGL_LENGTH);
 974         break;
 975     default:
 976         /*
 977          * Fall back to what the linux driver does.
 978          * Do this because the API may send an opcode
 979          * the driver knows nothing about and this will
 980          * at least stop PCIABRT's from hosing us.
 981          */
 982         switch (cmd->generic.sgl_offset) {
 983         case 2:
 984             twe_fillin_sgl(&cmd->param.sgl[0], segs, nsegments, TWE_MAX_SGL_LENGTH);
 985             break;
 986         case 3:
 987             twe_fillin_sgl(&cmd->io.sgl[0], segs, nsegments, TWE_MAX_SGL_LENGTH);
 988             break;
 989         case 5:
 990             twe_fillin_sgl(&cmd->ata.sgl[0], segs, nsegments, TWE_MAX_ATA_SGL_LENGTH);
 991             break;
 992         }
 993     }
 994     if (tr->tr_flags & TWE_CMD_DATAIN)
 995         bus_dmamap_sync(tr->tr_sc->twe_buffer_dmat, tr->tr_dmamap, BUS_DMASYNC_PREREAD);
 996     if (tr->tr_flags & TWE_CMD_DATAOUT) {
 997         /* if we're using an alignment buffer, and we're writing data, copy the real data out */
 998         if (tr->tr_flags & TWE_CMD_ALIGNBUF)
 999             bcopy(tr->tr_realdata, tr->tr_data, tr->tr_length);
1000         bus_dmamap_sync(tr->tr_sc->twe_buffer_dmat, tr->tr_dmamap, BUS_DMASYNC_PREWRITE);
1001     }
1002     if (twe_start(tr) == EBUSY) {
1003         tr->tr_sc->twe_state |= TWE_STATE_CTLR_BUSY;
1004         twe_requeue_ready(tr);
1005     }
1006 }
1007
1008 static void
1009 twe_setup_request_dmamap(void *arg, bus_dma_segment_t *segs, int nsegments, int error)
1010 {
1011     struct twe_request  *tr = (struct twe_request *)arg;
1012
1013     debug_called(4);
1014
1015     /* command can't cross a page boundary */
1016     tr->tr_cmdphys = segs[0].ds_addr;
1017 }
1018
1019 int
1020 twe_map_request(struct twe_request *tr)
1021 {
1022     struct twe_softc    *sc = tr->tr_sc;
1023     int                 error = 0;
1024
1025     debug_called(4);
1026
1027     if (sc->twe_state & (TWE_STATE_CTLR_BUSY | TWE_STATE_FRZN)) {
1028         twe_requeue_ready(tr);
1029         return (EBUSY);
1030     }
1031
1032     /*
1033      * Map the command into bus space.
1034      */
1035     bus_dmamap_sync(sc->twe_buffer_dmat, tr->tr_cmdmap, BUS_DMASYNC_PREWRITE);
1036
1037     /*
1038      * If the command involves data, map that too.
1039      */
1040     if ((tr->tr_data != NULL) && ((tr->tr_flags & TWE_CMD_MAPPED) == 0)) {
1041
1042         /*
1043          * Data must be 512-byte aligned; allocate a fixup buffer if it's not.
1044          *
1045          * DragonFly's malloc only guarentees alignment for requests which
1046          * are power-of-2 sized.
1047          */
1048         if (((vm_offset_t)tr->tr_data % TWE_ALIGNMENT) != 0) {
1049             int aligned_size;
1050
1051             tr->tr_realdata = tr->tr_data;      /* save pointer to 'real' data */
1052             aligned_size = TWE_ALIGNMENT;
1053             while (aligned_size < tr->tr_length)
1054                 aligned_size <<= 1;
1055             tr->tr_flags |= TWE_CMD_ALIGNBUF;
1056             tr->tr_data = kmalloc(aligned_size, TWE_MALLOC_CLASS, M_INTWAIT);
1057             if (tr->tr_data == NULL) {
1058                 twe_printf(sc, "%s: malloc failed\n", __func__);
1059                 tr->tr_data = tr->tr_realdata; /* restore original data pointer */
1060                 return(ENOMEM);
1061             }
1062         }
1063
1064         /*
1065          * Map the data buffer into bus space and build the s/g list.
1066          */
1067         if ((error = bus_dmamap_load(sc->twe_buffer_dmat, tr->tr_dmamap, tr->tr_data,
1068                         tr->tr_length, twe_setup_data_dmamap, tr, BUS_DMA_NOWAIT)
1069                         == EINPROGRESS)) {
1070             tr->tr_flags |= TWE_CMD_IN_PROGRESS;
1071             sc->twe_state |= TWE_STATE_FRZN;
1072             error = 0;
1073         }
1074     } else {
1075         if ((error = twe_start(tr)) == EBUSY) {
1076             sc->twe_state |= TWE_STATE_CTLR_BUSY;
1077             twe_requeue_ready(tr);
1078         }
1079     }
1080
1081     return(error);
1082 }
1083
1084 void
1085 twe_unmap_request(struct twe_request *tr)
1086 {
1087     struct twe_softc    *sc = tr->tr_sc;
1088     debug_called(4);
1089
1090     /*
1091      * Unmap the command from bus space.
1092      */
1093     bus_dmamap_sync(sc->twe_buffer_dmat, tr->tr_cmdmap, BUS_DMASYNC_POSTWRITE);
1094
1095     /*
1096      * If the command involved data, unmap that too.
1097      */
1098     if (tr->tr_data != NULL) {
1099
1100         if (tr->tr_flags & TWE_CMD_DATAIN) {
1101             bus_dmamap_sync(sc->twe_buffer_dmat, tr->tr_dmamap, BUS_DMASYNC_POSTREAD);
1102             /* if we're using an alignment buffer, and we're reading data, copy the real data in */
1103             if (tr->tr_flags & TWE_CMD_ALIGNBUF)
1104                 bcopy(tr->tr_data, tr->tr_realdata, tr->tr_length);
1105         }
1106         if (tr->tr_flags & TWE_CMD_DATAOUT)
1107             bus_dmamap_sync(sc->twe_buffer_dmat, tr->tr_dmamap, BUS_DMASYNC_POSTWRITE);
1108
1109         bus_dmamap_unload(sc->twe_buffer_dmat, tr->tr_dmamap);
1110     }
1111
1112     /* free alignment buffer if it was used */
1113     if (tr->tr_flags & TWE_CMD_ALIGNBUF) {
1114         kfree(tr->tr_data, TWE_MALLOC_CLASS);
1115         tr->tr_data = tr->tr_realdata;          /* restore 'real' data pointer */
1116     }
1117 }
1118
1119 #ifdef TWE_DEBUG
1120 void twe_report(void);
1121 /********************************************************************************
1122  * Print current controller status, call from DDB.
1123  */
1124 void
1125 twe_report(void)
1126 {
1127     struct twe_softc    *sc;
1128     int                 i;
1129
1130     crit_enter();
1131     for (i = 0; (sc = devclass_get_softc(twe_devclass, i)) != NULL; i++)
1132         twe_print_controller(sc);
1133     kprintf("twed: total bio count in %u  out %u\n", twed_bio_in, twed_bio_out);
1134     crit_exit();
1135 }
1136 #endif