1 /* 2 * Core maple bus functionality 3 * 4 * Copyright (C) 2007 - 2009 Adrian McMenamin 5 * Copyright (C) 2001 - 2008 Paul Mundt 6 * Copyright (C) 2000 - 2001 YAEGASHI Takeshi 7 * Copyright (C) 2001 M. R. Brown 8 * 9 * This file is subject to the terms and conditions of the GNU General Public 10 * License. See the file "COPYING" in the main directory of this archive 11 * for more details. 12 */ 13 #include <linux/init.h> 14 #include <linux/kernel.h> 15 #include <linux/device.h> 16 #include <linux/interrupt.h> 17 #include <linux/list.h> 18 #include <linux/io.h> 19 #include <linux/slab.h> 20 #include <linux/maple.h> 21 #include <linux/dma-mapping.h> 22 #include <linux/delay.h> 23 #include <linux/module.h> 24 #include <asm/cacheflush.h> 25 #include <asm/dma.h> 26 #include <asm/io.h> 27 #include <mach/dma.h> 28 #include <mach/sysasic.h> 29 30 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>"); 31 MODULE_DESCRIPTION("Maple bus driver for Dreamcast"); 32 MODULE_LICENSE("GPL v2"); 33 34 static void maple_dma_handler(struct work_struct *work); 35 static void maple_vblank_handler(struct work_struct *work); 36 37 static DECLARE_WORK(maple_dma_process, maple_dma_handler); 38 static DECLARE_WORK(maple_vblank_process, maple_vblank_handler); 39 40 static LIST_HEAD(maple_waitq); 41 static LIST_HEAD(maple_sentq); 42 43 /* mutex to protect queue of waiting packets */ 44 static DEFINE_MUTEX(maple_wlist_lock); 45 46 static struct maple_driver maple_unsupported_device; 47 static struct device maple_bus; 48 static int subdevice_map[MAPLE_PORTS]; 49 static unsigned long *maple_sendbuf, *maple_sendptr, *maple_lastptr; 50 static unsigned long maple_pnp_time; 51 static int started, scanning, fullscan; 52 static struct kmem_cache *maple_queue_cache; 53 54 struct maple_device_specify { 55 int port; 56 int unit; 57 }; 58 59 static bool checked[MAPLE_PORTS]; 60 static bool empty[MAPLE_PORTS]; 61 static struct maple_device *baseunits[MAPLE_PORTS]; 62 63 /** 64 * maple_driver_register - register a maple driver 65 * @drv: maple driver to be registered. 66 * 67 * Registers the passed in @drv, while updating the bus type. 68 * Devices with matching function IDs will be automatically probed. 69 */ 70 int maple_driver_register(struct maple_driver *drv) 71 { 72 if (!drv) 73 return -EINVAL; 74 75 drv->drv.bus = &maple_bus_type; 76 77 return driver_register(&drv->drv); 78 } 79 EXPORT_SYMBOL_GPL(maple_driver_register); 80 81 /** 82 * maple_driver_unregister - unregister a maple driver. 83 * @drv: maple driver to unregister. 84 * 85 * Cleans up after maple_driver_register(). To be invoked in the exit 86 * path of any module drivers. 87 */ 88 void maple_driver_unregister(struct maple_driver *drv) 89 { 90 driver_unregister(&drv->drv); 91 } 92 EXPORT_SYMBOL_GPL(maple_driver_unregister); 93 94 /* set hardware registers to enable next round of dma */ 95 static void maple_dma_reset(void) 96 { 97 __raw_writel(MAPLE_MAGIC, MAPLE_RESET); 98 /* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */ 99 __raw_writel(1, MAPLE_TRIGTYPE); 100 /* 101 * Maple system register 102 * bits 31 - 16 timeout in units of 20nsec 103 * bit 12 hard trigger - set 0 to keep responding to VBLANK 104 * bits 9 - 8 set 00 for 2 Mbps, 01 for 1 Mbps 105 * bits 3 - 0 delay (in 1.3ms) between VBLANK and start of DMA 106 * max delay is 11 107 */ 108 __raw_writel(MAPLE_2MBPS | MAPLE_TIMEOUT(0xFFFF), MAPLE_SPEED); 109 __raw_writel(virt_to_phys(maple_sendbuf), MAPLE_DMAADDR); 110 __raw_writel(1, MAPLE_ENABLE); 111 } 112 113 /** 114 * maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND 115 * @dev: device responding 116 * @callback: handler callback 117 * @interval: interval in jiffies between callbacks 118 * @function: the function code for the device 119 */ 120 void maple_getcond_callback(struct maple_device *dev, 121 void (*callback) (struct mapleq *mq), 122 unsigned long interval, unsigned long function) 123 { 124 dev->callback = callback; 125 dev->interval = interval; 126 dev->function = cpu_to_be32(function); 127 dev->when = jiffies; 128 } 129 EXPORT_SYMBOL_GPL(maple_getcond_callback); 130 131 static int maple_dma_done(void) 132 { 133 return (__raw_readl(MAPLE_STATE) & 1) == 0; 134 } 135 136 static void maple_release_device(struct device *dev) 137 { 138 struct maple_device *mdev; 139 struct mapleq *mq; 140 141 mdev = to_maple_dev(dev); 142 mq = mdev->mq; 143 kmem_cache_free(maple_queue_cache, mq->recvbuf); 144 kfree(mq); 145 kfree(mdev); 146 } 147 148 /** 149 * maple_add_packet - add a single instruction to the maple bus queue 150 * @mdev: maple device 151 * @function: function on device being queried 152 * @command: maple command to add 153 * @length: length of command string (in 32 bit words) 154 * @data: remainder of command string 155 */ 156 int maple_add_packet(struct maple_device *mdev, u32 function, u32 command, 157 size_t length, void *data) 158 { 159 int ret = 0; 160 void *sendbuf = NULL; 161 162 if (length) { 163 sendbuf = kcalloc(length, 4, GFP_KERNEL); 164 if (!sendbuf) { 165 ret = -ENOMEM; 166 goto out; 167 } 168 ((__be32 *)sendbuf)[0] = cpu_to_be32(function); 169 } 170 171 mdev->mq->command = command; 172 mdev->mq->length = length; 173 if (length > 1) 174 memcpy(sendbuf + 4, data, (length - 1) * 4); 175 mdev->mq->sendbuf = sendbuf; 176 177 mutex_lock(&maple_wlist_lock); 178 list_add_tail(&mdev->mq->list, &maple_waitq); 179 mutex_unlock(&maple_wlist_lock); 180 out: 181 return ret; 182 } 183 EXPORT_SYMBOL_GPL(maple_add_packet); 184 185 static struct mapleq *maple_allocq(struct maple_device *mdev) 186 { 187 struct mapleq *mq; 188 189 mq = kzalloc(sizeof(*mq), GFP_KERNEL); 190 if (!mq) 191 goto failed_nomem; 192 193 INIT_LIST_HEAD(&mq->list); 194 mq->dev = mdev; 195 mq->recvbuf = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL); 196 if (!mq->recvbuf) 197 goto failed_p2; 198 mq->recvbuf->buf = &((mq->recvbuf->bufx)[0]); 199 200 return mq; 201 202 failed_p2: 203 kfree(mq); 204 failed_nomem: 205 dev_err(&mdev->dev, "could not allocate memory for device (%d, %d)\n", 206 mdev->port, mdev->unit); 207 return NULL; 208 } 209 210 static struct maple_device *maple_alloc_dev(int port, int unit) 211 { 212 struct maple_device *mdev; 213 214 /* zero this out to avoid kobj subsystem 215 * thinking it has already been registered */ 216 217 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 218 if (!mdev) 219 return NULL; 220 221 mdev->port = port; 222 mdev->unit = unit; 223 224 mdev->mq = maple_allocq(mdev); 225 226 if (!mdev->mq) { 227 kfree(mdev); 228 return NULL; 229 } 230 mdev->dev.bus = &maple_bus_type; 231 mdev->dev.parent = &maple_bus; 232 init_waitqueue_head(&mdev->maple_wait); 233 return mdev; 234 } 235 236 static void maple_free_dev(struct maple_device *mdev) 237 { 238 kmem_cache_free(maple_queue_cache, mdev->mq->recvbuf); 239 kfree(mdev->mq); 240 kfree(mdev); 241 } 242 243 /* process the command queue into a maple command block 244 * terminating command has bit 32 of first long set to 0 245 */ 246 static void maple_build_block(struct mapleq *mq) 247 { 248 int port, unit, from, to, len; 249 unsigned long *lsendbuf = mq->sendbuf; 250 251 port = mq->dev->port & 3; 252 unit = mq->dev->unit; 253 len = mq->length; 254 from = port << 6; 255 to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20); 256 257 *maple_lastptr &= 0x7fffffff; 258 maple_lastptr = maple_sendptr; 259 260 *maple_sendptr++ = (port << 16) | len | 0x80000000; 261 *maple_sendptr++ = virt_to_phys(mq->recvbuf->buf); 262 *maple_sendptr++ = 263 mq->command | (to << 8) | (from << 16) | (len << 24); 264 while (len-- > 0) 265 *maple_sendptr++ = *lsendbuf++; 266 } 267 268 /* build up command queue */ 269 static void maple_send(void) 270 { 271 int i, maple_packets = 0; 272 struct mapleq *mq, *nmq; 273 274 if (!maple_dma_done()) 275 return; 276 277 /* disable DMA */ 278 __raw_writel(0, MAPLE_ENABLE); 279 280 if (!list_empty(&maple_sentq)) 281 goto finish; 282 283 mutex_lock(&maple_wlist_lock); 284 if (list_empty(&maple_waitq)) { 285 mutex_unlock(&maple_wlist_lock); 286 goto finish; 287 } 288 289 maple_lastptr = maple_sendbuf; 290 maple_sendptr = maple_sendbuf; 291 292 list_for_each_entry_safe(mq, nmq, &maple_waitq, list) { 293 maple_build_block(mq); 294 list_del_init(&mq->list); 295 list_add_tail(&mq->list, &maple_sentq); 296 if (maple_packets++ > MAPLE_MAXPACKETS) 297 break; 298 } 299 mutex_unlock(&maple_wlist_lock); 300 if (maple_packets > 0) { 301 for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++) 302 __flush_purge_region(maple_sendbuf + i * PAGE_SIZE, 303 PAGE_SIZE); 304 } 305 306 finish: 307 maple_dma_reset(); 308 } 309 310 /* check if there is a driver registered likely to match this device */ 311 static int maple_check_matching_driver(struct device_driver *driver, 312 void *devptr) 313 { 314 struct maple_driver *maple_drv; 315 struct maple_device *mdev; 316 317 mdev = devptr; 318 maple_drv = to_maple_driver(driver); 319 if (mdev->devinfo.function & cpu_to_be32(maple_drv->function)) 320 return 1; 321 return 0; 322 } 323 324 static void maple_detach_driver(struct maple_device *mdev) 325 { 326 device_unregister(&mdev->dev); 327 } 328 329 /* process initial MAPLE_COMMAND_DEVINFO for each device or port */ 330 static void maple_attach_driver(struct maple_device *mdev) 331 { 332 char *p, *recvbuf; 333 unsigned long function; 334 int matched, error; 335 336 recvbuf = mdev->mq->recvbuf->buf; 337 /* copy the data as individual elements in 338 * case of memory optimisation */ 339 memcpy(&mdev->devinfo.function, recvbuf + 4, 4); 340 memcpy(&mdev->devinfo.function_data[0], recvbuf + 8, 12); 341 memcpy(&mdev->devinfo.area_code, recvbuf + 20, 1); 342 memcpy(&mdev->devinfo.connector_direction, recvbuf + 21, 1); 343 memcpy(&mdev->devinfo.product_name[0], recvbuf + 22, 30); 344 memcpy(&mdev->devinfo.standby_power, recvbuf + 112, 2); 345 memcpy(&mdev->devinfo.max_power, recvbuf + 114, 2); 346 memcpy(mdev->product_name, mdev->devinfo.product_name, 30); 347 mdev->product_name[30] = '\0'; 348 memcpy(mdev->product_licence, mdev->devinfo.product_licence, 60); 349 mdev->product_licence[60] = '\0'; 350 351 for (p = mdev->product_name + 29; mdev->product_name <= p; p--) 352 if (*p == ' ') 353 *p = '\0'; 354 else 355 break; 356 for (p = mdev->product_licence + 59; mdev->product_licence <= p; p--) 357 if (*p == ' ') 358 *p = '\0'; 359 else 360 break; 361 362 function = be32_to_cpu(mdev->devinfo.function); 363 364 dev_info(&mdev->dev, "detected %s: function 0x%lX: at (%d, %d)\n", 365 mdev->product_name, function, mdev->port, mdev->unit); 366 367 if (function > 0x200) { 368 /* Do this silently - as not a real device */ 369 function = 0; 370 mdev->driver = &maple_unsupported_device; 371 dev_set_name(&mdev->dev, "%d:0.port", mdev->port); 372 } else { 373 matched = 374 bus_for_each_drv(&maple_bus_type, NULL, mdev, 375 maple_check_matching_driver); 376 377 if (matched == 0) { 378 /* Driver does not exist yet */ 379 dev_info(&mdev->dev, "no driver found\n"); 380 mdev->driver = &maple_unsupported_device; 381 } 382 dev_set_name(&mdev->dev, "%d:0%d.%lX", mdev->port, 383 mdev->unit, function); 384 } 385 386 mdev->function = function; 387 mdev->dev.release = &maple_release_device; 388 389 atomic_set(&mdev->busy, 0); 390 error = device_register(&mdev->dev); 391 if (error) { 392 dev_warn(&mdev->dev, "could not register device at" 393 " (%d, %d), with error 0x%X\n", mdev->unit, 394 mdev->port, error); 395 maple_free_dev(mdev); 396 mdev = NULL; 397 return; 398 } 399 } 400 401 /* 402 * if device has been registered for the given 403 * port and unit then return 1 - allows identification 404 * of which devices need to be attached or detached 405 */ 406 static int check_maple_device(struct device *device, void *portptr) 407 { 408 struct maple_device_specify *ds; 409 struct maple_device *mdev; 410 411 ds = portptr; 412 mdev = to_maple_dev(device); 413 if (mdev->port == ds->port && mdev->unit == ds->unit) 414 return 1; 415 return 0; 416 } 417 418 static int setup_maple_commands(struct device *device, void *ignored) 419 { 420 int add; 421 struct maple_device *mdev = to_maple_dev(device); 422 if (mdev->interval > 0 && atomic_read(&mdev->busy) == 0 && 423 time_after(jiffies, mdev->when)) { 424 /* bounce if we cannot add */ 425 add = maple_add_packet(mdev, 426 be32_to_cpu(mdev->devinfo.function), 427 MAPLE_COMMAND_GETCOND, 1, NULL); 428 if (!add) 429 mdev->when = jiffies + mdev->interval; 430 } else { 431 if (time_after(jiffies, maple_pnp_time)) 432 /* Ensure we don't have block reads and devinfo 433 * calls interfering with one another - so flag the 434 * device as busy */ 435 if (atomic_read(&mdev->busy) == 0) { 436 atomic_set(&mdev->busy, 1); 437 maple_add_packet(mdev, 0, 438 MAPLE_COMMAND_DEVINFO, 0, NULL); 439 } 440 } 441 return 0; 442 } 443 444 /* VBLANK bottom half - implemented via workqueue */ 445 static void maple_vblank_handler(struct work_struct *work) 446 { 447 int x, locking; 448 struct maple_device *mdev; 449 450 if (!maple_dma_done()) 451 return; 452 453 __raw_writel(0, MAPLE_ENABLE); 454 455 if (!list_empty(&maple_sentq)) 456 goto finish; 457 458 /* 459 * Set up essential commands - to fetch data and 460 * check devices are still present 461 */ 462 bus_for_each_dev(&maple_bus_type, NULL, NULL, 463 setup_maple_commands); 464 465 if (time_after(jiffies, maple_pnp_time)) { 466 /* 467 * Scan the empty ports - bus is flakey and may have 468 * mis-reported emptyness 469 */ 470 for (x = 0; x < MAPLE_PORTS; x++) { 471 if (checked[x] && empty[x]) { 472 mdev = baseunits[x]; 473 if (!mdev) 474 break; 475 atomic_set(&mdev->busy, 1); 476 locking = maple_add_packet(mdev, 0, 477 MAPLE_COMMAND_DEVINFO, 0, NULL); 478 if (!locking) 479 break; 480 } 481 } 482 483 maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL; 484 } 485 486 finish: 487 maple_send(); 488 } 489 490 /* handle devices added via hotplugs - placing them on queue for DEVINFO */ 491 static void maple_map_subunits(struct maple_device *mdev, int submask) 492 { 493 int retval, k, devcheck; 494 struct maple_device *mdev_add; 495 struct maple_device_specify ds; 496 497 ds.port = mdev->port; 498 for (k = 0; k < 5; k++) { 499 ds.unit = k + 1; 500 retval = 501 bus_for_each_dev(&maple_bus_type, NULL, &ds, 502 check_maple_device); 503 if (retval) { 504 submask = submask >> 1; 505 continue; 506 } 507 devcheck = submask & 0x01; 508 if (devcheck) { 509 mdev_add = maple_alloc_dev(mdev->port, k + 1); 510 if (!mdev_add) 511 return; 512 atomic_set(&mdev_add->busy, 1); 513 maple_add_packet(mdev_add, 0, MAPLE_COMMAND_DEVINFO, 514 0, NULL); 515 /* mark that we are checking sub devices */ 516 scanning = 1; 517 } 518 submask = submask >> 1; 519 } 520 } 521 522 /* mark a device as removed */ 523 static void maple_clean_submap(struct maple_device *mdev) 524 { 525 int killbit; 526 527 killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20); 528 killbit = ~killbit; 529 killbit &= 0xFF; 530 subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit; 531 } 532 533 /* handle empty port or hotplug removal */ 534 static void maple_response_none(struct maple_device *mdev) 535 { 536 maple_clean_submap(mdev); 537 538 if (likely(mdev->unit != 0)) { 539 /* 540 * Block devices play up 541 * and give the impression they have 542 * been removed even when still in place or 543 * trip the mtd layer when they have 544 * really gone - this code traps that eventuality 545 * and ensures we aren't overloaded with useless 546 * error messages 547 */ 548 if (mdev->can_unload) { 549 if (!mdev->can_unload(mdev)) { 550 atomic_set(&mdev->busy, 2); 551 wake_up(&mdev->maple_wait); 552 return; 553 } 554 } 555 556 dev_info(&mdev->dev, "detaching device at (%d, %d)\n", 557 mdev->port, mdev->unit); 558 maple_detach_driver(mdev); 559 return; 560 } else { 561 if (!started || !fullscan) { 562 if (checked[mdev->port] == false) { 563 checked[mdev->port] = true; 564 empty[mdev->port] = true; 565 dev_info(&mdev->dev, "no devices" 566 " to port %d\n", mdev->port); 567 } 568 return; 569 } 570 } 571 /* Some hardware devices generate false detach messages on unit 0 */ 572 atomic_set(&mdev->busy, 0); 573 } 574 575 /* preprocess hotplugs or scans */ 576 static void maple_response_devinfo(struct maple_device *mdev, 577 char *recvbuf) 578 { 579 char submask; 580 if (!started || (scanning == 2) || !fullscan) { 581 if ((mdev->unit == 0) && (checked[mdev->port] == false)) { 582 checked[mdev->port] = true; 583 maple_attach_driver(mdev); 584 } else { 585 if (mdev->unit != 0) 586 maple_attach_driver(mdev); 587 if (mdev->unit == 0) { 588 empty[mdev->port] = false; 589 maple_attach_driver(mdev); 590 } 591 } 592 } 593 if (mdev->unit == 0) { 594 submask = recvbuf[2] & 0x1F; 595 if (submask ^ subdevice_map[mdev->port]) { 596 maple_map_subunits(mdev, submask); 597 subdevice_map[mdev->port] = submask; 598 } 599 } 600 } 601 602 static void maple_response_fileerr(struct maple_device *mdev, void *recvbuf) 603 { 604 if (mdev->fileerr_handler) { 605 mdev->fileerr_handler(mdev, recvbuf); 606 return; 607 } else 608 dev_warn(&mdev->dev, "device at (%d, %d) reports" 609 "file error 0x%X\n", mdev->port, mdev->unit, 610 ((int *)recvbuf)[1]); 611 } 612 613 static void maple_port_rescan(void) 614 { 615 int i; 616 struct maple_device *mdev; 617 618 fullscan = 1; 619 for (i = 0; i < MAPLE_PORTS; i++) { 620 if (checked[i] == false) { 621 fullscan = 0; 622 mdev = baseunits[i]; 623 maple_add_packet(mdev, 0, MAPLE_COMMAND_DEVINFO, 624 0, NULL); 625 } 626 } 627 } 628 629 /* maple dma end bottom half - implemented via workqueue */ 630 static void maple_dma_handler(struct work_struct *work) 631 { 632 struct mapleq *mq, *nmq; 633 struct maple_device *mdev; 634 char *recvbuf; 635 enum maple_code code; 636 637 if (!maple_dma_done()) 638 return; 639 __raw_writel(0, MAPLE_ENABLE); 640 if (!list_empty(&maple_sentq)) { 641 list_for_each_entry_safe(mq, nmq, &maple_sentq, list) { 642 mdev = mq->dev; 643 recvbuf = mq->recvbuf->buf; 644 __flush_invalidate_region(sh_cacheop_vaddr(recvbuf), 645 0x400); 646 code = recvbuf[0]; 647 kfree(mq->sendbuf); 648 list_del_init(&mq->list); 649 switch (code) { 650 case MAPLE_RESPONSE_NONE: 651 maple_response_none(mdev); 652 break; 653 654 case MAPLE_RESPONSE_DEVINFO: 655 maple_response_devinfo(mdev, recvbuf); 656 atomic_set(&mdev->busy, 0); 657 break; 658 659 case MAPLE_RESPONSE_DATATRF: 660 if (mdev->callback) 661 mdev->callback(mq); 662 atomic_set(&mdev->busy, 0); 663 wake_up(&mdev->maple_wait); 664 break; 665 666 case MAPLE_RESPONSE_FILEERR: 667 maple_response_fileerr(mdev, recvbuf); 668 atomic_set(&mdev->busy, 0); 669 wake_up(&mdev->maple_wait); 670 break; 671 672 case MAPLE_RESPONSE_AGAIN: 673 case MAPLE_RESPONSE_BADCMD: 674 case MAPLE_RESPONSE_BADFUNC: 675 dev_warn(&mdev->dev, "non-fatal error" 676 " 0x%X at (%d, %d)\n", code, 677 mdev->port, mdev->unit); 678 atomic_set(&mdev->busy, 0); 679 break; 680 681 case MAPLE_RESPONSE_ALLINFO: 682 dev_notice(&mdev->dev, "extended" 683 " device information request for (%d, %d)" 684 " but call is not supported\n", mdev->port, 685 mdev->unit); 686 atomic_set(&mdev->busy, 0); 687 break; 688 689 case MAPLE_RESPONSE_OK: 690 atomic_set(&mdev->busy, 0); 691 wake_up(&mdev->maple_wait); 692 break; 693 694 default: 695 break; 696 } 697 } 698 /* if scanning is 1 then we have subdevices to check */ 699 if (scanning == 1) { 700 maple_send(); 701 scanning = 2; 702 } else 703 scanning = 0; 704 /*check if we have actually tested all ports yet */ 705 if (!fullscan) 706 maple_port_rescan(); 707 /* mark that we have been through the first scan */ 708 started = 1; 709 } 710 maple_send(); 711 } 712 713 static irqreturn_t maple_dma_interrupt(int irq, void *dev_id) 714 { 715 /* Load everything into the bottom half */ 716 schedule_work(&maple_dma_process); 717 return IRQ_HANDLED; 718 } 719 720 static irqreturn_t maple_vblank_interrupt(int irq, void *dev_id) 721 { 722 schedule_work(&maple_vblank_process); 723 return IRQ_HANDLED; 724 } 725 726 static int maple_set_dma_interrupt_handler(void) 727 { 728 return request_irq(HW_EVENT_MAPLE_DMA, maple_dma_interrupt, 729 IRQF_SHARED, "maple bus DMA", &maple_unsupported_device); 730 } 731 732 static int maple_set_vblank_interrupt_handler(void) 733 { 734 return request_irq(HW_EVENT_VSYNC, maple_vblank_interrupt, 735 IRQF_SHARED, "maple bus VBLANK", &maple_unsupported_device); 736 } 737 738 static int maple_get_dma_buffer(void) 739 { 740 maple_sendbuf = 741 (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, 742 MAPLE_DMA_PAGES); 743 if (!maple_sendbuf) 744 return -ENOMEM; 745 return 0; 746 } 747 748 static int maple_match_bus_driver(struct device *devptr, 749 struct device_driver *drvptr) 750 { 751 struct maple_driver *maple_drv = to_maple_driver(drvptr); 752 struct maple_device *maple_dev = to_maple_dev(devptr); 753 754 /* Trap empty port case */ 755 if (maple_dev->devinfo.function == 0xFFFFFFFF) 756 return 0; 757 else if (maple_dev->devinfo.function & 758 cpu_to_be32(maple_drv->function)) 759 return 1; 760 return 0; 761 } 762 763 static int maple_bus_uevent(struct device *dev, 764 struct kobj_uevent_env *env) 765 { 766 return 0; 767 } 768 769 static void maple_bus_release(struct device *dev) 770 { 771 } 772 773 static struct maple_driver maple_unsupported_device = { 774 .drv = { 775 .name = "maple_unsupported_device", 776 .bus = &maple_bus_type, 777 }, 778 }; 779 /* 780 * maple_bus_type - core maple bus structure 781 */ 782 struct bus_type maple_bus_type = { 783 .name = "maple", 784 .match = maple_match_bus_driver, 785 .uevent = maple_bus_uevent, 786 }; 787 EXPORT_SYMBOL_GPL(maple_bus_type); 788 789 static struct device maple_bus = { 790 .init_name = "maple", 791 .release = maple_bus_release, 792 }; 793 794 static int __init maple_bus_init(void) 795 { 796 int retval, i; 797 struct maple_device *mdev[MAPLE_PORTS]; 798 799 __raw_writel(0, MAPLE_ENABLE); 800 801 retval = device_register(&maple_bus); 802 if (retval) 803 goto cleanup; 804 805 retval = bus_register(&maple_bus_type); 806 if (retval) 807 goto cleanup_device; 808 809 retval = driver_register(&maple_unsupported_device.drv); 810 if (retval) 811 goto cleanup_bus; 812 813 /* allocate memory for maple bus dma */ 814 retval = maple_get_dma_buffer(); 815 if (retval) { 816 dev_err(&maple_bus, "failed to allocate DMA buffers\n"); 817 goto cleanup_basic; 818 } 819 820 /* set up DMA interrupt handler */ 821 retval = maple_set_dma_interrupt_handler(); 822 if (retval) { 823 dev_err(&maple_bus, "bus failed to grab maple " 824 "DMA IRQ\n"); 825 goto cleanup_dma; 826 } 827 828 /* set up VBLANK interrupt handler */ 829 retval = maple_set_vblank_interrupt_handler(); 830 if (retval) { 831 dev_err(&maple_bus, "bus failed to grab VBLANK IRQ\n"); 832 goto cleanup_irq; 833 } 834 835 maple_queue_cache = KMEM_CACHE(maple_buffer, SLAB_HWCACHE_ALIGN); 836 837 if (!maple_queue_cache) { 838 retval = -ENOMEM; 839 goto cleanup_bothirqs; 840 } 841 842 INIT_LIST_HEAD(&maple_waitq); 843 INIT_LIST_HEAD(&maple_sentq); 844 845 /* setup maple ports */ 846 for (i = 0; i < MAPLE_PORTS; i++) { 847 checked[i] = false; 848 empty[i] = false; 849 mdev[i] = maple_alloc_dev(i, 0); 850 if (!mdev[i]) { 851 while (i-- > 0) 852 maple_free_dev(mdev[i]); 853 retval = -ENOMEM; 854 goto cleanup_cache; 855 } 856 baseunits[i] = mdev[i]; 857 atomic_set(&mdev[i]->busy, 1); 858 maple_add_packet(mdev[i], 0, MAPLE_COMMAND_DEVINFO, 0, NULL); 859 subdevice_map[i] = 0; 860 } 861 862 maple_pnp_time = jiffies + HZ; 863 /* prepare initial queue */ 864 maple_send(); 865 dev_info(&maple_bus, "bus core now registered\n"); 866 867 return 0; 868 869 cleanup_cache: 870 kmem_cache_destroy(maple_queue_cache); 871 872 cleanup_bothirqs: 873 free_irq(HW_EVENT_VSYNC, 0); 874 875 cleanup_irq: 876 free_irq(HW_EVENT_MAPLE_DMA, 0); 877 878 cleanup_dma: 879 free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES); 880 881 cleanup_basic: 882 driver_unregister(&maple_unsupported_device.drv); 883 884 cleanup_bus: 885 bus_unregister(&maple_bus_type); 886 887 cleanup_device: 888 device_unregister(&maple_bus); 889 890 cleanup: 891 printk(KERN_ERR "Maple bus registration failed\n"); 892 return retval; 893 } 894 /* Push init to later to ensure hardware gets detected */ 895 fs_initcall(maple_bus_init); 896