drivers/sh/maple/maple.c

   1 /*
   2  * Core maple bus functionality
   3  *
   4  *  Copyright (C) 2007 Adrian McMenamin
   5  *
   6  * Based on 2.4 code by:
   7  *
   8  *  Copyright (C) 2000-2001 YAEGASHI Takeshi
   9  *  Copyright (C) 2001 M. R. Brown
  10  *  Copyright (C) 2001 Paul Mundt
  11  *
  12  * and others.
  13  *
  14  * This file is subject to the terms and conditions of the GNU General Public
  15  * License.  See the file "COPYING" in the main directory of this archive
  16  * for more details.
  17  */
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/device.h>
  21 #include <linux/module.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/list.h>
  24 #include <linux/io.h>
  25 #include <linux/slab.h>
  26 #include <linux/maple.h>
  27 #include <linux/dma-mapping.h>
  28 #include <asm/cacheflush.h>
  29 #include <asm/dma.h>
  30 #include <asm/io.h>
  31 #include <asm/mach/dma.h>
  32 #include <asm/mach/sysasic.h>
  33 #include <asm/mach/maple.h>
  34
  35 MODULE_AUTHOR("Yaegshi Takeshi, Paul Mundt, M.R. Brown, Adrian McMenamin");
  36 MODULE_DESCRIPTION("Maple bus driver for Dreamcast");
  37 MODULE_LICENSE("GPL v2");
  38 MODULE_SUPPORTED_DEVICE("{{SEGA, Dreamcast/Maple}}");
  39
  40 static void maple_dma_handler(struct work_struct *work);
  41 static void maple_vblank_handler(struct work_struct *work);
  42
  43 static DECLARE_WORK(maple_dma_process, maple_dma_handler);
  44 static DECLARE_WORK(maple_vblank_process, maple_vblank_handler);
  45
  46 static LIST_HEAD(maple_waitq);
  47 static LIST_HEAD(maple_sentq);
  48
  49 static DEFINE_MUTEX(maple_list_lock);
  50
  51 static struct maple_driver maple_dummy_driver;
  52 static struct device maple_bus;
  53 static int subdevice_map[MAPLE_PORTS];
  54 static unsigned long *maple_sendbuf, *maple_sendptr, *maple_lastptr;
  55 static unsigned long maple_pnp_time;
  56 static int started, scanning, liststatus;
  57 static struct kmem_cache *maple_queue_cache;
  58
  59 struct maple_device_specify {
  60        int port;
  61        int unit;
  62 };
  63
  64 /**
  65  *  maple_driver_register - register a device driver
  66  *  automatically makes the driver bus a maple bus
  67  *  @drv: the driver to be registered
  68  */
  69 int maple_driver_register(struct device_driver *drv)
  70 {
  71        if (!drv)
  72                return -EINVAL;
  73        drv->bus = &maple_bus_type;
  74        return driver_register(drv);
  75 }
  76 EXPORT_SYMBOL_GPL(maple_driver_register);
  77
  78 /* set hardware registers to enable next round of dma */
  79 static void maplebus_dma_reset(void)
  80 {
  81        ctrl_outl(MAPLE_MAGIC, MAPLE_RESET);
  82        /* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */
  83        ctrl_outl(1, MAPLE_TRIGTYPE);
  84        ctrl_outl(MAPLE_2MBPS | MAPLE_TIMEOUT(50000), MAPLE_SPEED);
  85        ctrl_outl(PHYSADDR(maple_sendbuf), MAPLE_DMAADDR);
  86        ctrl_outl(1, MAPLE_ENABLE);
  87 }
  88
  89 /**
  90  * maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND
  91  * @dev: device responding
  92  * @callback: handler callback
  93  * @interval: interval in jiffies between callbacks
  94  * @function: the function code for the device
  95  */
  96 void maple_getcond_callback(struct maple_device *dev,
  97                            void (*callback) (struct mapleq * mq),
  98                            unsigned long interval, unsigned long function)
  99 {
 100        dev->callback = callback;
 101        dev->interval = interval;
 102        dev->function = cpu_to_be32(function);
 103        dev->when = jiffies;
 104 }
 105 EXPORT_SYMBOL_GPL(maple_getcond_callback);
 106
 107 static int maple_dma_done(void)
 108 {
 109        return (ctrl_inl(MAPLE_STATE) & 1) == 0;
 110 }
 111
 112 static void maple_release_device(struct device *dev)
 113 {
 114        if (dev->type) {
 115                kfree(dev->type->name);
 116                kfree(dev->type);
 117        }
 118 }
 119
 120 /**
 121  * maple_add_packet - add a single instruction to the queue
 122  * @mq: instruction to add to waiting queue
 123  */
 124 void maple_add_packet(struct mapleq *mq)
 125 {
 126        mutex_lock(&maple_list_lock);
 127        list_add(&mq->list, &maple_waitq);
 128        mutex_unlock(&maple_list_lock);
 129 }
 130 EXPORT_SYMBOL_GPL(maple_add_packet);
 131
 132 static struct mapleq *maple_allocq(struct maple_device *dev)
 133 {
 134        struct mapleq *mq;
 135
 136        mq = kmalloc(sizeof(*mq), GFP_KERNEL);
 137        if (!mq)
 138                return NULL;
 139
 140        mq->dev = dev;
 141        mq->recvbufdcsp = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
 142        mq->recvbuf = (void *) P2SEGADDR(mq->recvbufdcsp);
 143        if (!mq->recvbuf) {
 144                kfree(mq);
 145                return NULL;
 146        }
 147
 148        return mq;
 149 }
 150
 151 static struct maple_device *maple_alloc_dev(int port, int unit)
 152 {
 153        struct maple_device *dev;
 154
 155        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 156        if (!dev)
 157                return NULL;
 158
 159        dev->port = port;
 160        dev->unit = unit;
 161        dev->mq = maple_allocq(dev);
 162
 163        if (!dev->mq) {
 164                kfree(dev);
 165                return NULL;
 166        }
 167
 168        return dev;
 169 }
 170
 171 static void maple_free_dev(struct maple_device *mdev)
 172 {
 173        if (!mdev)
 174                return;
 175        if (mdev->mq) {
 176                kmem_cache_free(maple_queue_cache, mdev->mq->recvbufdcsp);
 177                kfree(mdev->mq);
 178        }
 179        kfree(mdev);
 180 }
 181
 182 /* process the command queue into a maple command block
 183  * terminating command has bit 32 of first long set to 0
 184  */
 185 static void maple_build_block(struct mapleq *mq)
 186 {
 187        int port, unit, from, to, len;
 188        unsigned long *lsendbuf = mq->sendbuf;
 189
 190        port = mq->dev->port & 3;
 191        unit = mq->dev->unit;
 192        len = mq->length;
 193        from = port << 6;
 194        to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20);
 195
 196        *maple_lastptr &= 0x7fffffff;
 197        maple_lastptr = maple_sendptr;
 198
 199        *maple_sendptr++ = (port << 16) | len | 0x80000000;
 200        *maple_sendptr++ = PHYSADDR(mq->recvbuf);
 201        *maple_sendptr++ =
 202            mq->command | (to << 8) | (from << 16) | (len << 24);
 203
 204        while (len-- > 0)
 205                *maple_sendptr++ = *lsendbuf++;
 206 }
 207
 208 /* build up command queue */
 209 static void maple_send(void)
 210 {
 211        int i;
 212        int maple_packets;
 213        struct mapleq *mq, *nmq;
 214
 215        if (!list_empty(&maple_sentq))
 216                return;
 217        if (list_empty(&maple_waitq) || !maple_dma_done())
 218                return;
 219        maple_packets = 0;
 220        maple_sendptr = maple_lastptr = maple_sendbuf;
 221        list_for_each_entry_safe(mq, nmq, &maple_waitq, list) {
 222                maple_build_block(mq);
 223                list_move(&mq->list, &maple_sentq);
 224                if (maple_packets++ > MAPLE_MAXPACKETS)
 225                        break;
 226        }
 227        if (maple_packets > 0) {
 228                for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++)
 229                        dma_cache_sync(0, maple_sendbuf + i * PAGE_SIZE,
 230                                       PAGE_SIZE, DMA_BIDIRECTIONAL);
 231        }
 232 }
 233
 234 static int attach_matching_maple_driver(struct device_driver *driver,
 235                                        void *devptr)
 236 {
 237        struct maple_driver *maple_drv;
 238        struct maple_device *mdev;
 239
 240        mdev = devptr;
 241        maple_drv = to_maple_driver(driver);
 242        if (mdev->devinfo.function & be32_to_cpu(maple_drv->function)) {
 243                if (maple_drv->connect(mdev) == 0) {
 244                        mdev->driver = maple_drv;
 245                        return 1;
 246                }
 247        }
 248        return 0;
 249 }
 250
 251 static void maple_detach_driver(struct maple_device *mdev)
 252 {
 253        if (!mdev)
 254                return;
 255        if (mdev->driver) {
 256                if (mdev->driver->disconnect)
 257                        mdev->driver->disconnect(mdev);
 258        }
 259        mdev->driver = NULL;
 260        if (mdev->registered) {
 261                maple_release_device(&mdev->dev);
 262                device_unregister(&mdev->dev);
 263        }
 264        mdev->registered = 0;
 265        maple_free_dev(mdev);
 266 }
 267
 268 /* process initial MAPLE_COMMAND_DEVINFO for each device or port */
 269 static void maple_attach_driver(struct maple_device *dev)
 270 {
 271        char *p;
 272
 273        char *recvbuf;
 274        unsigned long function;
 275        int matched, retval;
 276
 277        recvbuf = dev->mq->recvbuf;
 278        memcpy(&dev->devinfo, recvbuf + 4, sizeof(dev->devinfo));
 279        memcpy(dev->product_name, dev->devinfo.product_name, 30);
 280        memcpy(dev->product_licence, dev->devinfo.product_licence, 60);
 281        dev->product_name[30] = '\0';
 282        dev->product_licence[60] = '\0';
 283
 284        for (p = dev->product_name + 29; dev->product_name <= p; p--)
 285                if (*p == ' ')
 286                        *p = '\0';
 287                else
 288                        break;
 289
 290        for (p = dev->product_licence + 59; dev->product_licence <= p; p--)
 291                if (*p == ' ')
 292                        *p = '\0';
 293                else
 294                        break;
 295
 296        function = be32_to_cpu(dev->devinfo.function);
 297
 298        if (function > 0x200) {
 299                /* Do this silently - as not a real device */
 300                function = 0;
 301                dev->driver = &maple_dummy_driver;
 302                sprintf(dev->dev.bus_id, "%d:0.port", dev->port);
 303        } else {
 304                printk(KERN_INFO
 305                       "Maple bus at (%d, %d): Connected function 0x%lX\n",
 306                       dev->port, dev->unit, function);
 307
 308                matched =
 309                    bus_for_each_drv(&maple_bus_type, NULL, dev,
 310                                     attach_matching_maple_driver);
 311
 312                if (matched == 0) {
 313                        /* Driver does not exist yet */
 314                        printk(KERN_INFO
 315                               "No maple driver found for this device\n");
 316                        dev->driver = &maple_dummy_driver;
 317                }
 318
 319                sprintf(dev->dev.bus_id, "%d:0%d.%lX", dev->port,
 320                        dev->unit, function);
 321        }
 322        dev->function = function;
 323        dev->dev.bus = &maple_bus_type;
 324        dev->dev.parent = &maple_bus;
 325        dev->dev.release = &maple_release_device;
 326        retval = device_register(&dev->dev);
 327        if (retval) {
 328                printk(KERN_INFO
 329                       "Maple bus: Attempt to register device (%x, %x) failed.\n",
 330                       dev->port, dev->unit);
 331                maple_free_dev(dev);
 332        }
 333        dev->registered = 1;
 334 }
 335
 336 /*
 337  * if device has been registered for the given
 338  * port and unit then return 1 - allows identification
 339  * of which devices need to be attached or detached
 340  */
 341 static int detach_maple_device(struct device *device, void *portptr)
 342 {
 343        struct maple_device_specify *ds;
 344        struct maple_device *mdev;
 345
 346        ds = portptr;
 347        mdev = to_maple_dev(device);
 348        if (mdev->port == ds->port && mdev->unit == ds->unit)
 349                return 1;
 350        return 0;
 351 }
 352
 353 static int setup_maple_commands(struct device *device, void *ignored)
 354 {
 355        struct maple_device *maple_dev = to_maple_dev(device);
 356
 357        if ((maple_dev->interval > 0)
 358            && time_after(jiffies, maple_dev->when)) {
 359                maple_dev->when = jiffies + maple_dev->interval;
 360                maple_dev->mq->command = MAPLE_COMMAND_GETCOND;
 361                maple_dev->mq->sendbuf = &maple_dev->function;
 362                maple_dev->mq->length = 1;
 363                maple_add_packet(maple_dev->mq);
 364                liststatus++;
 365        } else {
 366                if (time_after(jiffies, maple_pnp_time)) {
 367                        maple_dev->mq->command = MAPLE_COMMAND_DEVINFO;
 368                        maple_dev->mq->length = 0;
 369                        maple_add_packet(maple_dev->mq);
 370                        liststatus++;
 371                }
 372        }
 373
 374        return 0;
 375 }
 376
 377 /* VBLANK bottom half - implemented via workqueue */
 378 static void maple_vblank_handler(struct work_struct *work)
 379 {
 380        if (!maple_dma_done())
 381                return;
 382        if (!list_empty(&maple_sentq))
 383                return;
 384        ctrl_outl(0, MAPLE_ENABLE);
 385        liststatus = 0;
 386        bus_for_each_dev(&maple_bus_type, NULL, NULL,
 387                         setup_maple_commands);
 388        if (time_after(jiffies, maple_pnp_time))
 389                maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL;
 390        if (liststatus && list_empty(&maple_sentq)) {
 391                INIT_LIST_HEAD(&maple_sentq);
 392                maple_send();
 393        }
 394        maplebus_dma_reset();
 395 }
 396
 397 /* handle devices added via hotplugs - placing them on queue for DEVINFO*/
 398 static void maple_map_subunits(struct maple_device *mdev, int submask)
 399 {
 400        int retval, k, devcheck;
 401        struct maple_device *mdev_add;
 402        struct maple_device_specify ds;
 403
 404        for (k = 0; k < 5; k++) {
 405                ds.port = mdev->port;
 406                ds.unit = k + 1;
 407                retval =
 408                    bus_for_each_dev(&maple_bus_type, NULL, &ds,
 409                                     detach_maple_device);
 410                if (retval) {
 411                        submask = submask >> 1;
 412                        continue;
 413                }
 414                devcheck = submask & 0x01;
 415                if (devcheck) {
 416                        mdev_add = maple_alloc_dev(mdev->port, k + 1);
 417                        if (!mdev_add)
 418                                return;
 419                        mdev_add->mq->command = MAPLE_COMMAND_DEVINFO;
 420                        mdev_add->mq->length = 0;
 421                        maple_add_packet(mdev_add->mq);
 422                        scanning = 1;
 423                }
 424                submask = submask >> 1;
 425        }
 426 }
 427
 428 /* mark a device as removed */
 429 static void maple_clean_submap(struct maple_device *mdev)
 430 {
 431        int killbit;
 432
 433        killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20);
 434        killbit = ~killbit;
 435        killbit &= 0xFF;
 436        subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit;
 437 }
 438
 439 /* handle empty port or hotplug removal */
 440 static void maple_response_none(struct maple_device *mdev,
 441                                struct mapleq *mq)
 442 {
 443        if (mdev->unit != 0) {
 444                list_del(&mq->list);
 445                maple_clean_submap(mdev);
 446                printk(KERN_INFO
 447                       "Maple bus device detaching at (%d, %d)\n",
 448                       mdev->port, mdev->unit);
 449                maple_detach_driver(mdev);
 450                return;
 451        }
 452        if (!started) {
 453                printk(KERN_INFO "No maple devices attached to port %d\n",
 454                       mdev->port);
 455                return;
 456        }
 457        maple_clean_submap(mdev);
 458 }
 459
 460 /* preprocess hotplugs or scans */
 461 static void maple_response_devinfo(struct maple_device *mdev,
 462                                   char *recvbuf)
 463 {
 464        char submask;
 465        if ((!started) || (scanning == 2)) {
 466                maple_attach_driver(mdev);
 467                return;
 468        }
 469        if (mdev->unit == 0) {
 470                submask = recvbuf[2] & 0x1F;
 471                if (submask ^ subdevice_map[mdev->port]) {
 472                        maple_map_subunits(mdev, submask);
 473                        subdevice_map[mdev->port] = submask;
 474                }
 475        }
 476 }
 477
 478 /* maple dma end bottom half - implemented via workqueue */
 479 static void maple_dma_handler(struct work_struct *work)
 480 {
 481        struct mapleq *mq, *nmq;
 482        struct maple_device *dev;
 483        char *recvbuf;
 484        enum maple_code code;
 485
 486        if (!maple_dma_done())
 487                return;
 488        ctrl_outl(0, MAPLE_ENABLE);
 489        if (!list_empty(&maple_sentq)) {
 490                list_for_each_entry_safe(mq, nmq, &maple_sentq, list) {
 491                        recvbuf = mq->recvbuf;
 492                        code = recvbuf[0];
 493                        dev = mq->dev;
 494                        switch (code) {
 495                        case MAPLE_RESPONSE_NONE:
 496                                maple_response_none(dev, mq);
 497                                break;
 498
 499                        case MAPLE_RESPONSE_DEVINFO:
 500                                maple_response_devinfo(dev, recvbuf);
 501                                break;
 502
 503                        case MAPLE_RESPONSE_DATATRF:
 504                                if (dev->callback)
 505                                        dev->callback(mq);
 506                                break;
 507
 508                        case MAPLE_RESPONSE_FILEERR:
 509                        case MAPLE_RESPONSE_AGAIN:
 510                        case MAPLE_RESPONSE_BADCMD:
 511                        case MAPLE_RESPONSE_BADFUNC:
 512                                printk(KERN_DEBUG
 513                                       "Maple non-fatal error 0x%X\n",
 514                                       code);
 515                                break;
 516
 517                        case MAPLE_RESPONSE_ALLINFO:
 518                                printk(KERN_DEBUG
 519                                       "Maple - extended device information not supported\n");
 520                                break;
 521
 522                        case MAPLE_RESPONSE_OK:
 523                                break;
 524
 525                        default:
 526                                break;
 527                        }
 528                }
 529                INIT_LIST_HEAD(&maple_sentq);
 530                if (scanning == 1) {
 531                        maple_send();
 532                        scanning = 2;
 533                } else
 534                        scanning = 0;
 535
 536                if (started == 0)
 537                        started = 1;
 538        }
 539        maplebus_dma_reset();
 540 }
 541
 542 static irqreturn_t maplebus_dma_interrupt(int irq, void *dev_id)
 543 {
 544        /* Load everything into the bottom half */
 545        schedule_work(&maple_dma_process);
 546        return IRQ_HANDLED;
 547 }
 548
 549 static irqreturn_t maplebus_vblank_interrupt(int irq, void *dev_id)
 550 {
 551        schedule_work(&maple_vblank_process);
 552        return IRQ_HANDLED;
 553 }
 554
 555 static struct irqaction maple_dma_irq = {
 556        .name = "maple bus DMA handler",
 557        .handler = maplebus_dma_interrupt,
 558        .flags = IRQF_SHARED,
 559 };
 560
 561 static struct irqaction maple_vblank_irq = {
 562        .name = "maple bus VBLANK handler",
 563        .handler = maplebus_vblank_interrupt,
 564        .flags = IRQF_SHARED,
 565 };
 566
 567 static int maple_set_dma_interrupt_handler(void)
 568 {
 569        return setup_irq(HW_EVENT_MAPLE_DMA, &maple_dma_irq);
 570 }
 571
 572 static int maple_set_vblank_interrupt_handler(void)
 573 {
 574        return setup_irq(HW_EVENT_VSYNC, &maple_vblank_irq);
 575 }
 576
 577 static int maple_get_dma_buffer(void)
 578 {
 579        maple_sendbuf =
 580            (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
 581                                      MAPLE_DMA_PAGES);
 582        if (!maple_sendbuf)
 583                return -ENOMEM;
 584        return 0;
 585 }
 586
 587 static int match_maple_bus_driver(struct device *devptr,
 588                                  struct device_driver *drvptr)
 589 {
 590        struct maple_driver *maple_drv;
 591        struct maple_device *maple_dev;
 592
 593        maple_drv = container_of(drvptr, struct maple_driver, drv);
 594        maple_dev = container_of(devptr, struct maple_device, dev);
 595        /* Trap empty port case */
 596        if (maple_dev->devinfo.function == 0xFFFFFFFF)
 597                return 0;
 598        else if (maple_dev->devinfo.function &
 599                 be32_to_cpu(maple_drv->function))
 600                return 1;
 601        return 0;
 602 }
 603
 604 static int maple_bus_uevent(struct device *dev, char **envp,
 605                            int num_envp, char *buffer, int buffer_size)
 606 {
 607        return 0;
 608 }
 609
 610 static void maple_bus_release(struct device *dev)
 611 {
 612 }
 613
 614 static struct maple_driver maple_dummy_driver = {
 615        .drv = {
 616                .name = "maple_dummy_driver",
 617                .bus =  &maple_bus_type,
 618        },
 619 };
 620
 621 struct bus_type maple_bus_type = {
 622        .name =         "maple",
 623        .match =        match_maple_bus_driver,
 624        .uevent =       maple_bus_uevent,
 625 };
 626 EXPORT_SYMBOL_GPL(maple_bus_type);
 627
 628 static struct device maple_bus = {
 629        .bus_id = "maple",
 630        .release = maple_bus_release,
 631 };
 632
 633 static int __init maple_bus_init(void)
 634 {
 635        int retval, i;
 636        struct maple_device *mdev[MAPLE_PORTS];
 637        ctrl_outl(0, MAPLE_STATE);
 638
 639        retval = device_register(&maple_bus);
 640        if (retval)
 641                goto cleanup;
 642
 643        retval = bus_register(&maple_bus_type);
 644        if (retval)
 645                goto cleanup_device;
 646
 647        retval = driver_register(&maple_dummy_driver.drv);
 648
 649        if (retval)
 650                goto cleanup_bus;
 651
 652        /* allocate memory for maple bus dma */
 653        retval = maple_get_dma_buffer();
 654        if (retval) {
 655                printk(KERN_INFO
 656                       "Maple bus: Failed to allocate Maple DMA buffers\n");
 657                goto cleanup_basic;
 658        }
 659
 660        /* set up DMA interrupt handler */
 661        retval = maple_set_dma_interrupt_handler();
 662        if (retval) {
 663                printk(KERN_INFO
 664                       "Maple bus: Failed to grab maple DMA IRQ\n");
 665                goto cleanup_dma;
 666        }
 667
 668        /* set up VBLANK interrupt handler */
 669        retval = maple_set_vblank_interrupt_handler();
 670        if (retval) {
 671                printk(KERN_INFO "Maple bus: Failed to grab VBLANK IRQ\n");
 672                goto cleanup_irq;
 673        }
 674
 675        maple_queue_cache =
 676            kmem_cache_create("maple_queue_cache", 0x400, 0,
 677                              SLAB_HWCACHE_ALIGN, NULL);
 678
 679        if (!maple_queue_cache)
 680                goto cleanup_bothirqs;
 681
 682        /* setup maple ports */
 683        for (i = 0; i < MAPLE_PORTS; i++) {
 684                mdev[i] = maple_alloc_dev(i, 0);
 685                if (!mdev[i]) {
 686                        while (i-- > 0)
 687                                maple_free_dev(mdev[i]);
 688                        goto cleanup_cache;
 689                }
 690                mdev[i]->registered = 0;
 691                mdev[i]->mq->command = MAPLE_COMMAND_DEVINFO;
 692                mdev[i]->mq->length = 0;
 693                maple_attach_driver(mdev[i]);
 694                maple_add_packet(mdev[i]->mq);
 695                subdevice_map[i] = 0;
 696        }
 697
 698        /* setup maplebus hardware */
 699        maplebus_dma_reset();
 700
 701        /* initial detection */
 702        maple_send();
 703
 704        maple_pnp_time = jiffies;
 705
 706        printk(KERN_INFO "Maple bus core now registered.\n");
 707
 708        return 0;
 709
 710 cleanup_cache:
 711        kmem_cache_destroy(maple_queue_cache);
 712
 713 cleanup_bothirqs:
 714        free_irq(HW_EVENT_VSYNC, 0);
 715
 716 cleanup_irq:
 717        free_irq(HW_EVENT_MAPLE_DMA, 0);
 718
 719 cleanup_dma:
 720        free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES);
 721
 722 cleanup_basic:
 723        driver_unregister(&maple_dummy_driver.drv);
 724
 725 cleanup_bus:
 726        bus_unregister(&maple_bus_type);
 727
 728 cleanup_device:
 729        device_unregister(&maple_bus);
 730
 731 cleanup:
 732        printk(KERN_INFO "Maple bus registration failed\n");
 733        return retval;
 734 }
 735 subsys_initcall(maple_bus_init);