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
  77 EXPORT_SYMBOL_GPL(maple_driver_register);
  78
  79 /* set hardware registers to enable next round of dma */
  80 static void maplebus_dma_reset(void)
  81 {
  82         ctrl_outl(MAPLE_MAGIC, MAPLE_RESET);
  83         /* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */
  84         ctrl_outl(1, MAPLE_TRIGTYPE);
  85         ctrl_outl(MAPLE_2MBPS | MAPLE_TIMEOUT(50000), MAPLE_SPEED);
  86         ctrl_outl(PHYSADDR(maple_sendbuf), MAPLE_DMAADDR);
  87         ctrl_outl(1, MAPLE_ENABLE);
  88 }
  89
  90 /**
  91  * maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND
  92  * @dev: device responding
  93  * @callback: handler callback
  94  * @interval: interval in jiffies between callbacks
  95  * @function: the function code for the device
  96  */
  97 void maple_getcond_callback(struct maple_device *dev,
  98                             void (*callback) (struct mapleq * mq),
  99                             unsigned long interval, unsigned long function)
 100 {
 101         dev->callback = callback;
 102         dev->interval = interval;
 103         dev->function = cpu_to_be32(function);
 104         dev->when = jiffies;
 105 }
 106
 107 EXPORT_SYMBOL_GPL(maple_getcond_callback);
 108
 109 static int maple_dma_done(void)
 110 {
 111         return (ctrl_inl(MAPLE_STATE) & 1) == 0;
 112 }
 113
 114 static void maple_release_device(struct device *dev)
 115 {
 116         if (dev->type) {
 117                 kfree(dev->type->name);
 118                 kfree(dev->type);
 119         }
 120 }
 121
 122 /**
 123  * maple_add_packet - add a single instruction to the queue
 124  * @mq: instruction to add to waiting queue
 125  */
 126 void maple_add_packet(struct mapleq *mq)
 127 {
 128         mutex_lock(&maple_list_lock);
 129         list_add(&mq->list, &maple_waitq);
 130         mutex_unlock(&maple_list_lock);
 131 }
 132
 133 EXPORT_SYMBOL_GPL(maple_add_packet);
 134
 135 static struct mapleq *maple_allocq(struct maple_device *dev)
 136 {
 137         struct mapleq *mq;
 138
 139         mq = kmalloc(sizeof(*mq), GFP_KERNEL);
 140         if (!mq)
 141                 return NULL;
 142
 143         mq->dev = dev;
 144         mq->recvbufdcsp = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
 145         mq->recvbuf = (void *) P2SEGADDR(mq->recvbufdcsp);
 146         if (!mq->recvbuf) {
 147                 kfree(mq);
 148                 return NULL;
 149         }
 150
 151         return mq;
 152 }
 153
 154 static struct maple_device *maple_alloc_dev(int port, int unit)
 155 {
 156         struct maple_device *dev;
 157
 158         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 159         if (!dev)
 160                 return NULL;
 161
 162         dev->port = port;
 163         dev->unit = unit;
 164         dev->mq = maple_allocq(dev);
 165
 166         if (!dev->mq) {
 167                 kfree(dev);
 168                 return NULL;
 169         }
 170
 171         return dev;
 172 }
 173
 174 static void maple_free_dev(struct maple_device *mdev)
 175 {
 176         if (!mdev)
 177                 return;
 178         if (mdev->mq) {
 179                 kmem_cache_free(maple_queue_cache, mdev->mq->recvbufdcsp);
 180                 kfree(mdev->mq);
 181         }
 182         kfree(mdev);
 183 }
 184
 185 /* process the command queue into a maple command block
 186  * terminating command has bit 32 of first long set to 0
 187  */
 188 static void maple_build_block(struct mapleq *mq)
 189 {
 190         int port, unit, from, to, len;
 191         unsigned long *lsendbuf = mq->sendbuf;
 192
 193         port = mq->dev->port & 3;
 194         unit = mq->dev->unit;
 195         len = mq->length;
 196         from = port << 6;
 197         to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20);
 198
 199         *maple_lastptr &= 0x7fffffff;
 200         maple_lastptr = maple_sendptr;
 201
 202         *maple_sendptr++ = (port << 16) | len | 0x80000000;
 203         *maple_sendptr++ = PHYSADDR(mq->recvbuf);
 204         *maple_sendptr++ =
 205             mq->command | (to << 8) | (from << 16) | (len << 24);
 206
 207         while (len-- > 0)
 208                 *maple_sendptr++ = *lsendbuf++;
 209 }
 210
 211 /* build up command queue */
 212 static void maple_send(void)
 213 {
 214         int i;
 215         int maple_packets;
 216         struct mapleq *mq, *nmq;
 217
 218         if (!list_empty(&maple_sentq))
 219                 return;
 220         if (list_empty(&maple_waitq) || !maple_dma_done())
 221                 return;
 222         maple_packets = 0;
 223         maple_sendptr = maple_lastptr = maple_sendbuf;
 224         list_for_each_entry_safe(mq, nmq, &maple_waitq, list) {
 225                 maple_build_block(mq);
 226                 list_move(&mq->list, &maple_sentq);
 227                 if (maple_packets++ > MAPLE_MAXPACKETS)
 228                         break;
 229         }
 230         if (maple_packets > 0) {
 231                 for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++)
 232                         dma_cache_sync(0, maple_sendbuf + i * PAGE_SIZE,
 233                                        PAGE_SIZE, DMA_BIDIRECTIONAL);
 234         }
 235 }
 236
 237 static int attach_matching_maple_driver(struct device_driver *driver,
 238                                         void *devptr)
 239 {
 240         struct maple_driver *maple_drv;
 241         struct maple_device *mdev;
 242
 243         mdev = devptr;
 244         maple_drv = to_maple_driver(driver);
 245         if (mdev->devinfo.function & be32_to_cpu(maple_drv->function)) {
 246                 if (maple_drv->connect(mdev) == 0) {
 247                         mdev->driver = maple_drv;
 248                         return 1;
 249                 }
 250         }
 251         return 0;
 252 }
 253
 254 static void maple_detach_driver(struct maple_device *mdev)
 255 {
 256         if (!mdev)
 257                 return;
 258         if (mdev->driver) {
 259                 if (mdev->driver->disconnect)
 260                         mdev->driver->disconnect(mdev);
 261         }
 262         mdev->driver = NULL;
 263         if (mdev->registered) {
 264                 maple_release_device(&mdev->dev);
 265                 device_unregister(&mdev->dev);
 266         }
 267         mdev->registered = 0;
 268         maple_free_dev(mdev);
 269 }
 270
 271 /* process initial MAPLE_COMMAND_DEVINFO for each device or port */
 272 static void maple_attach_driver(struct maple_device *dev)
 273 {
 274         char *p;
 275
 276         char *recvbuf;
 277         unsigned long function;
 278         int matched, retval;
 279
 280         recvbuf = dev->mq->recvbuf;
 281         memcpy(&dev->devinfo, recvbuf + 4, sizeof(dev->devinfo));
 282         memcpy(dev->product_name, dev->devinfo.product_name, 30);
 283         memcpy(dev->product_licence, dev->devinfo.product_licence, 60);
 284         dev->product_name[30] = '\0';
 285         dev->product_licence[60] = '\0';
 286
 287         for (p = dev->product_name + 29; dev->product_name <= p; p--)
 288                 if (*p == ' ')
 289                         *p = '\0';
 290                 else
 291                         break;
 292
 293         for (p = dev->product_licence + 59; dev->product_licence <= p; p--)
 294                 if (*p == ' ')
 295                         *p = '\0';
 296                 else
 297                         break;
 298
 299         function = be32_to_cpu(dev->devinfo.function);
 300
 301         if (function > 0x200) {
 302                 /* Do this silently - as not a real device */
 303                 function = 0;
 304                 dev->driver = &maple_dummy_driver;
 305                 sprintf(dev->dev.bus_id, "%d:0.port", dev->port);
 306         } else {
 307                 printk(KERN_INFO
 308                        "Maple bus at (%d, %d): Connected function 0x%lX\n",
 309                        dev->port, dev->unit, function);
 310
 311                 matched =
 312                     bus_for_each_drv(&maple_bus_type, NULL, dev,
 313                                      attach_matching_maple_driver);
 314
 315                 if (matched == 0) {
 316                         /* Driver does not exist yet */
 317                         printk(KERN_INFO
 318                                "No maple driver found for this device\n");
 319                         dev->driver = &maple_dummy_driver;
 320                 }
 321
 322                 sprintf(dev->dev.bus_id, "%d:0%d.%lX", dev->port,
 323                         dev->unit, function);
 324         }
 325         dev->function = function;
 326         dev->dev.bus = &maple_bus_type;
 327         dev->dev.parent = &maple_bus;
 328         dev->dev.release = &maple_release_device;
 329         retval = device_register(&dev->dev);
 330         if (retval) {
 331                 printk(KERN_INFO
 332                        "Maple bus: Attempt to register device (%x, %x) failed.\n",
 333                        dev->port, dev->unit);
 334                 maple_free_dev(dev);
 335         }
 336         dev->registered = 1;
 337 }
 338
 339 /*
 340  * if device has been registered for the given
 341  * port and unit then return 1 - allows identification
 342  * of which devices need to be attached or detached
 343  */
 344 static int detach_maple_device(struct device *device, void *portptr)
 345 {
 346         struct maple_device_specify *ds;
 347         struct maple_device *mdev;
 348
 349         ds = portptr;
 350         mdev = to_maple_dev(device);
 351         if (mdev->port == ds->port && mdev->unit == ds->unit)
 352                 return 1;
 353         return 0;
 354 }
 355
 356 static int setup_maple_commands(struct device *device, void *ignored)
 357 {
 358         struct maple_device *maple_dev = to_maple_dev(device);
 359
 360         if ((maple_dev->interval > 0)
 361             && time_after(jiffies, maple_dev->when)) {
 362                 maple_dev->when = jiffies + maple_dev->interval;
 363                 maple_dev->mq->command = MAPLE_COMMAND_GETCOND;
 364                 maple_dev->mq->sendbuf = &maple_dev->function;
 365                 maple_dev->mq->length = 1;
 366                 maple_add_packet(maple_dev->mq);
 367                 liststatus++;
 368         } else {
 369                 if (time_after(jiffies, maple_pnp_time)) {
 370                         maple_dev->mq->command = MAPLE_COMMAND_DEVINFO;
 371                         maple_dev->mq->length = 0;
 372                         maple_add_packet(maple_dev->mq);
 373                         liststatus++;
 374                 }
 375         }
 376
 377         return 0;
 378 }
 379
 380 /* VBLANK bottom half - implemented via workqueue */
 381 static void maple_vblank_handler(struct work_struct *work)
 382 {
 383         if (!maple_dma_done())
 384                 return;
 385         if (!list_empty(&maple_sentq))
 386                 return;
 387         ctrl_outl(0, MAPLE_ENABLE);
 388         liststatus = 0;
 389         bus_for_each_dev(&maple_bus_type, NULL, NULL,
 390                          setup_maple_commands);
 391         if (time_after(jiffies, maple_pnp_time))
 392                 maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL;
 393         if (liststatus && list_empty(&maple_sentq)) {
 394                 INIT_LIST_HEAD(&maple_sentq);
 395                 maple_send();
 396         }
 397         maplebus_dma_reset();
 398 }
 399
 400 /* handle devices added via hotplugs - placing them on queue for DEVINFO*/
 401 static void maple_map_subunits(struct maple_device *mdev, int submask)
 402 {
 403         int retval, k, devcheck;
 404         struct maple_device *mdev_add;
 405         struct maple_device_specify ds;
 406
 407         for (k = 0; k < 5; k++) {
 408                 ds.port = mdev->port;
 409                 ds.unit = k + 1;
 410                 retval =
 411                     bus_for_each_dev(&maple_bus_type, NULL, &ds,
 412                                      detach_maple_device);
 413                 if (retval) {
 414                         submask = submask >> 1;
 415                         continue;
 416                 }
 417                 devcheck = submask & 0x01;
 418                 if (devcheck) {
 419                         mdev_add = maple_alloc_dev(mdev->port, k + 1);
 420                         if (!mdev_add)
 421                                 return;
 422                         mdev_add->mq->command = MAPLE_COMMAND_DEVINFO;
 423                         mdev_add->mq->length = 0;
 424                         maple_add_packet(mdev_add->mq);
 425                         scanning = 1;
 426                 }
 427                 submask = submask >> 1;
 428         }
 429 }
 430
 431 /* mark a device as removed */
 432 static void maple_clean_submap(struct maple_device *mdev)
 433 {
 434         int killbit;
 435
 436         killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20);
 437         killbit = ~killbit;
 438         killbit &= 0xFF;
 439         subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit;
 440 }
 441
 442 /* handle empty port or hotplug removal */
 443 static void maple_response_none(struct maple_device *mdev,
 444                                 struct mapleq *mq)
 445 {
 446         if (mdev->unit != 0) {
 447                 list_del(&mq->list);
 448                 maple_clean_submap(mdev);
 449                 printk(KERN_INFO
 450                        "Maple bus device detaching at (%d, %d)\n",
 451                        mdev->port, mdev->unit);
 452                 maple_detach_driver(mdev);
 453                 return;
 454         }
 455         if (!started) {
 456                 printk(KERN_INFO "No maple devices attached to port %d\n",
 457                        mdev->port);
 458                 return;
 459         }
 460         maple_clean_submap(mdev);
 461 }
 462
 463 /* preprocess hotplugs or scans */
 464 static void maple_response_devinfo(struct maple_device *mdev,
 465                                    char *recvbuf)
 466 {
 467         char submask;
 468         if ((!started) || (scanning == 2)) {
 469                 maple_attach_driver(mdev);
 470                 return;
 471         }
 472         if (mdev->unit == 0) {
 473                 submask = recvbuf[2] & 0x1F;
 474                 if (submask ^ subdevice_map[mdev->port]) {
 475                         maple_map_subunits(mdev, submask);
 476                         subdevice_map[mdev->port] = submask;
 477                 }
 478         }
 479 }
 480
 481 /* maple dma end bottom half - implemented via workqueue */
 482 static void maple_dma_handler(struct work_struct *work)
 483 {
 484         struct mapleq *mq, *nmq;
 485         struct maple_device *dev;
 486         char *recvbuf;
 487         enum maple_code code;
 488
 489         if (!maple_dma_done())
 490                 return;
 491         ctrl_outl(0, MAPLE_ENABLE);
 492         if (!list_empty(&maple_sentq)) {
 493                 list_for_each_entry_safe(mq, nmq, &maple_sentq, list) {
 494                         recvbuf = mq->recvbuf;
 495                         code = recvbuf[0];
 496                         dev = mq->dev;
 497                         switch (code) {
 498                         case MAPLE_RESPONSE_NONE:
 499                                 maple_response_none(dev, mq);
 500                                 break;
 501
 502                         case MAPLE_RESPONSE_DEVINFO:
 503                                 maple_response_devinfo(dev, recvbuf);
 504                                 break;
 505
 506                         case MAPLE_RESPONSE_DATATRF:
 507                                 if (dev->callback)
 508                                         dev->callback(mq);
 509                                 break;
 510
 511                         case MAPLE_RESPONSE_FILEERR:
 512                         case MAPLE_RESPONSE_AGAIN:
 513                         case MAPLE_RESPONSE_BADCMD:
 514                         case MAPLE_RESPONSE_BADFUNC:
 515                                 printk(KERN_DEBUG
 516                                        "Maple non-fatal error 0x%X\n",
 517                                        code);
 518                                 break;
 519
 520                         case MAPLE_RESPONSE_ALLINFO:
 521                                 printk(KERN_DEBUG
 522                                        "Maple - extended device information not supported\n");
 523                                 break;
 524
 525                         case MAPLE_RESPONSE_OK:
 526                                 break;
 527
 528                         default:
 529                                 break;
 530                         }
 531                 }
 532                 INIT_LIST_HEAD(&maple_sentq);
 533                 if (scanning == 1) {
 534                         maple_send();
 535                         scanning = 2;
 536                 } else
 537                         scanning = 0;
 538
 539                 if (started == 0)
 540                         started = 1;
 541         }
 542         maplebus_dma_reset();
 543 }
 544
 545 static irqreturn_t maplebus_dma_interrupt(int irq, void *dev_id)
 546 {
 547         /* Load everything into the bottom half */
 548         schedule_work(&maple_dma_process);
 549         return IRQ_HANDLED;
 550 }
 551
 552 static irqreturn_t maplebus_vblank_interrupt(int irq, void *dev_id)
 553 {
 554         schedule_work(&maple_vblank_process);
 555         return IRQ_HANDLED;
 556 }
 557
 558 static struct irqaction maple_dma_irq = {
 559         .name = "maple bus DMA handler",
 560         .handler = maplebus_dma_interrupt,
 561         .flags = IRQF_SHARED,
 562 };
 563
 564 static struct irqaction maple_vblank_irq = {
 565         .name = "maple bus VBLANK handler",
 566         .handler = maplebus_vblank_interrupt,
 567         .flags = IRQF_SHARED,
 568 };
 569
 570 static int maple_set_dma_interrupt_handler(void)
 571 {
 572         return setup_irq(HW_EVENT_MAPLE_DMA, &maple_dma_irq);
 573 }
 574
 575 static int maple_set_vblank_interrupt_handler(void)
 576 {
 577         return setup_irq(HW_EVENT_VSYNC, &maple_vblank_irq);
 578 }
 579
 580 static int maple_get_dma_buffer(void)
 581 {
 582         maple_sendbuf =
 583             (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
 584                                       MAPLE_DMA_PAGES);
 585         if (!maple_sendbuf)
 586                 return -ENOMEM;
 587         return 0;
 588 }
 589
 590 static int match_maple_bus_driver(struct device *devptr,
 591                                   struct device_driver *drvptr)
 592 {
 593         struct maple_driver *maple_drv;
 594         struct maple_device *maple_dev;
 595
 596         maple_drv = container_of(drvptr, struct maple_driver, drv);
 597         maple_dev = container_of(devptr, struct maple_device, dev);
 598         /* Trap empty port case */
 599         if (maple_dev->devinfo.function == 0xFFFFFFFF)
 600                 return 0;
 601         else if (maple_dev->devinfo.function &
 602                  be32_to_cpu(maple_drv->function))
 603                 return 1;
 604         return 0;
 605 }
 606
 607 static int maple_bus_uevent(struct device *dev,
 608                             struct kobj_uevent_env *env)
 609 {
 610         return 0;
 611 }
 612
 613 static void maple_bus_release(struct device *dev)
 614 {
 615 }
 616
 617 static struct maple_driver maple_dummy_driver = {
 618         .drv = {
 619                 .name = "maple_dummy_driver",
 620                 .bus = &maple_bus_type,
 621                 },
 622 };
 623
 624 struct bus_type maple_bus_type = {
 625         .name = "maple",
 626         .match = match_maple_bus_driver,
 627         .uevent = maple_bus_uevent,
 628 };
 629
 630 EXPORT_SYMBOL_GPL(maple_bus_type);
 631
 632 static struct device maple_bus = {
 633         .bus_id = "maple",
 634         .release = maple_bus_release,
 635 };
 636
 637 static int __init maple_bus_init(void)
 638 {
 639         int retval, i;
 640         struct maple_device *mdev[MAPLE_PORTS];
 641         ctrl_outl(0, MAPLE_STATE);
 642
 643         retval = device_register(&maple_bus);
 644         if (retval)
 645                 goto cleanup;
 646
 647         retval = bus_register(&maple_bus_type);
 648         if (retval)
 649                 goto cleanup_device;
 650
 651         retval = driver_register(&maple_dummy_driver.drv);
 652
 653         if (retval)
 654                 goto cleanup_bus;
 655
 656         /* allocate memory for maple bus dma */
 657         retval = maple_get_dma_buffer();
 658         if (retval) {
 659                 printk(KERN_INFO
 660                        "Maple bus: Failed to allocate Maple DMA buffers\n");
 661                 goto cleanup_basic;
 662         }
 663
 664         /* set up DMA interrupt handler */
 665         retval = maple_set_dma_interrupt_handler();
 666         if (retval) {
 667                 printk(KERN_INFO
 668                        "Maple bus: Failed to grab maple DMA IRQ\n");
 669                 goto cleanup_dma;
 670         }
 671
 672         /* set up VBLANK interrupt handler */
 673         retval = maple_set_vblank_interrupt_handler();
 674         if (retval) {
 675                 printk(KERN_INFO "Maple bus: Failed to grab VBLANK IRQ\n");
 676                 goto cleanup_irq;
 677         }
 678
 679         maple_queue_cache =
 680             kmem_cache_create("maple_queue_cache", 0x400, 0,
 681                               SLAB_HWCACHE_ALIGN, NULL);
 682
 683         if (!maple_queue_cache)
 684                 goto cleanup_bothirqs;
 685
 686         /* setup maple ports */
 687         for (i = 0; i < MAPLE_PORTS; i++) {
 688                 mdev[i] = maple_alloc_dev(i, 0);
 689                 if (!mdev[i]) {
 690                         while (i-- > 0)
 691                                 maple_free_dev(mdev[i]);
 692                         goto cleanup_cache;
 693                 }
 694                 mdev[i]->registered = 0;
 695                 mdev[i]->mq->command = MAPLE_COMMAND_DEVINFO;
 696                 mdev[i]->mq->length = 0;
 697                 maple_attach_driver(mdev[i]);
 698                 maple_add_packet(mdev[i]->mq);
 699                 subdevice_map[i] = 0;
 700         }
 701
 702         /* setup maplebus hardware */
 703         maplebus_dma_reset();
 704
 705         /* initial detection */
 706         maple_send();
 707
 708         maple_pnp_time = jiffies;
 709
 710         printk(KERN_INFO "Maple bus core now registered.\n");
 711
 712         return 0;
 713
 714       cleanup_cache:
 715         kmem_cache_destroy(maple_queue_cache);
 716
 717       cleanup_bothirqs:
 718         free_irq(HW_EVENT_VSYNC, 0);
 719
 720       cleanup_irq:
 721         free_irq(HW_EVENT_MAPLE_DMA, 0);
 722
 723       cleanup_dma:
 724         free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES);
 725
 726       cleanup_basic:
 727         driver_unregister(&maple_dummy_driver.drv);
 728
 729       cleanup_bus:
 730         bus_unregister(&maple_bus_type);
 731
 732       cleanup_device:
 733         device_unregister(&maple_bus);
 734
 735       cleanup:
 736         printk(KERN_INFO "Maple bus registration failed\n");
 737         return retval;
 738 }
 739
 740 subsys_initcall(maple_bus_init);