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 <asm/cacheflush.h> 24 #include <asm/dma.h> 25 #include <asm/io.h> 26 #include <mach/dma.h> 27 #include <mach/sysasic.h> 28 29 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>"); 30 MODULE_DESCRIPTION("Maple bus driver for Dreamcast"); 31 MODULE_LICENSE("GPL v2"); 32 MODULE_SUPPORTED_DEVICE("{{SEGA, Dreamcast/Maple}}"); 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 ctrl_outl(MAPLE_MAGIC, MAPLE_RESET); 98 /* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */ 99 ctrl_outl(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 ctrl_outl(MAPLE_2MBPS | MAPLE_TIMEOUT(0xFFFF), MAPLE_SPEED); 109 ctrl_outl(PHYSADDR(maple_sendbuf), MAPLE_DMAADDR); 110 ctrl_outl(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 (ctrl_inl(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 = kzalloc(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++ = PHYSADDR(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 ctrl_outl(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 dma_cache_sync(0, maple_sendbuf + i * PAGE_SIZE, 303 PAGE_SIZE, DMA_BIDIRECTIONAL); 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 sprintf(mdev->dev.bus_id, "%d:0.port", mdev->port); 372 373 } else { 374 375 matched = 376 bus_for_each_drv(&maple_bus_type, NULL, mdev, 377 maple_check_matching_driver); 378 379 if (matched == 0) { 380 /* Driver does not exist yet */ 381 dev_info(&mdev->dev, "no driver found\n"); 382 mdev->driver = &maple_unsupported_device; 383 } 384 sprintf(mdev->dev.bus_id, "%d:0%d.%lX", mdev->port, 385 mdev->unit, function); 386 } 387 388 mdev->function = function; 389 mdev->dev.release = &maple_release_device; 390 391 atomic_set(&mdev->busy, 0); 392 error = device_register(&mdev->dev); 393 if (error) { 394 dev_warn(&mdev->dev, "could not register device at" 395 " (%d, %d), with error 0x%X\n", mdev->unit, 396 mdev->port, error); 397 maple_free_dev(mdev); 398 mdev = NULL; 399 return; 400 } 401 } 402 403 /* 404 * if device has been registered for the given 405 * port and unit then return 1 - allows identification 406 * of which devices need to be attached or detached 407 */ 408 static int check_maple_device(struct device *device, void *portptr) 409 { 410 struct maple_device_specify *ds; 411 struct maple_device *mdev; 412 413 ds = portptr; 414 mdev = to_maple_dev(device); 415 if (mdev->port == ds->port && mdev->unit == ds->unit) 416 return 1; 417 return 0; 418 } 419 420 static int setup_maple_commands(struct device *device, void *ignored) 421 { 422 int add; 423 struct maple_device *mdev = to_maple_dev(device); 424 if (mdev->interval > 0 && atomic_read(&mdev->busy) == 0 && 425 time_after(jiffies, mdev->when)) { 426 /* bounce if we cannot add */ 427 add = maple_add_packet(mdev, 428 be32_to_cpu(mdev->devinfo.function), 429 MAPLE_COMMAND_GETCOND, 1, NULL); 430 if (!add) 431 mdev->when = jiffies + mdev->interval; 432 } else { 433 if (time_after(jiffies, maple_pnp_time)) 434 /* Ensure we don't have block reads and devinfo 435 * calls interfering with one another - so flag the 436 * device as busy */ 437 if (atomic_read(&mdev->busy) == 0) { 438 atomic_set(&mdev->busy, 1); 439 maple_add_packet(mdev, 0, 440 MAPLE_COMMAND_DEVINFO, 0, NULL); 441 } 442 } 443 return 0; 444 } 445 446 /* VBLANK bottom half - implemented via workqueue */ 447 static void maple_vblank_handler(struct work_struct *work) 448 { 449 int x, locking; 450 struct maple_device *mdev; 451 452 if (!maple_dma_done()) 453 return; 454 455 ctrl_outl(0, MAPLE_ENABLE); 456 457 if (!list_empty(&maple_sentq)) 458 goto finish; 459 460 /* 461 * Set up essential commands - to fetch data and 462 * check devices are still present 463 */ 464 bus_for_each_dev(&maple_bus_type, NULL, NULL, 465 setup_maple_commands); 466 467 if (time_after(jiffies, maple_pnp_time)) { 468 /* 469 * Scan the empty ports - bus is flakey and may have 470 * mis-reported emptyness 471 */ 472 for (x = 0; x < MAPLE_PORTS; x++) { 473 if (checked[x] && empty[x]) { 474 mdev = baseunits[x]; 475 if (!mdev) 476 break; 477 atomic_set(&mdev->busy, 1); 478 locking = maple_add_packet(mdev, 0, 479 MAPLE_COMMAND_DEVINFO, 0, NULL); 480 if (!locking) 481 break; 482 } 483 } 484 485 maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL; 486 } 487 488 finish: 489 maple_send(); 490 } 491 492 /* handle devices added via hotplugs - placing them on queue for DEVINFO */ 493 static void maple_map_subunits(struct maple_device *mdev, int submask) 494 { 495 int retval, k, devcheck; 496 struct maple_device *mdev_add; 497 struct maple_device_specify ds; 498 499 ds.port = mdev->port; 500 for (k = 0; k < 5; k++) { 501 ds.unit = k + 1; 502 retval = 503 bus_for_each_dev(&maple_bus_type, NULL, &ds, 504 check_maple_device); 505 if (retval) { 506 submask = submask >> 1; 507 continue; 508 } 509 devcheck = submask & 0x01; 510 if (devcheck) { 511 mdev_add = maple_alloc_dev(mdev->port, k + 1); 512 if (!mdev_add) 513 return; 514 atomic_set(&mdev_add->busy, 1); 515 maple_add_packet(mdev_add, 0, MAPLE_COMMAND_DEVINFO, 516 0, NULL); 517 /* mark that we are checking sub devices */ 518 scanning = 1; 519 } 520 submask = submask >> 1; 521 } 522 } 523 524 /* mark a device as removed */ 525 static void maple_clean_submap(struct maple_device *mdev) 526 { 527 int killbit; 528 529 killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20); 530 killbit = ~killbit; 531 killbit &= 0xFF; 532 subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit; 533 } 534 535 /* handle empty port or hotplug removal */ 536 static void maple_response_none(struct maple_device *mdev) 537 { 538 maple_clean_submap(mdev); 539 540 if (likely(mdev->unit != 0)) { 541 /* 542 * Block devices play up 543 * and give the impression they have 544 * been removed even when still in place or 545 * trip the mtd layer when they have 546 * really gone - this code traps that eventuality 547 * and ensures we aren't overloaded with useless 548 * error messages 549 */ 550 if (mdev->can_unload) { 551 if (!mdev->can_unload(mdev)) { 552 atomic_set(&mdev->busy, 2); 553 wake_up(&mdev->maple_wait); 554 return; 555 } 556 } 557 558 dev_info(&mdev->dev, "detaching device at (%d, %d)\n", 559 mdev->port, mdev->unit); 560 maple_detach_driver(mdev); 561 return; 562 } else { 563 if (!started || !fullscan) { 564 if (checked[mdev->port] == false) { 565 checked[mdev->port] = true; 566 empty[mdev->port] = true; 567 dev_info(&mdev->dev, "no devices" 568 " to port %d\n", mdev->port); 569 } 570 return; 571 } 572 } 573 /* Some hardware devices generate false detach messages on unit 0 */ 574 atomic_set(&mdev->busy, 0); 575 } 576 577 /* preprocess hotplugs or scans */ 578 static void maple_response_devinfo(struct maple_device *mdev, 579 char *recvbuf) 580 { 581 char submask; 582 if (!started || (scanning == 2) || !fullscan) { 583 if ((mdev->unit == 0) && (checked[mdev->port] == false)) { 584 checked[mdev->port] = true; 585 maple_attach_driver(mdev); 586 } else { 587 if (mdev->unit != 0) 588 maple_attach_driver(mdev); 589 if (mdev->unit == 0) { 590 empty[mdev->port] = false; 591 maple_attach_driver(mdev); 592 } 593 } 594 } 595 if (mdev->unit == 0) { 596 submask = recvbuf[2] & 0x1F; 597 if (submask ^ subdevice_map[mdev->port]) { 598 maple_map_subunits(mdev, submask); 599 subdevice_map[mdev->port] = submask; 600 } 601 } 602 } 603 604 static void maple_response_fileerr(struct maple_device *mdev, void *recvbuf) 605 { 606 if (mdev->fileerr_handler) { 607 mdev->fileerr_handler(mdev, recvbuf); 608 return; 609 } else 610 dev_warn(&mdev->dev, "device at (%d, %d) reports" 611 "file error 0x%X\n", mdev->port, mdev->unit, 612 ((int *)recvbuf)[1]); 613 } 614 615 static void maple_port_rescan(void) 616 { 617 int i; 618 struct maple_device *mdev; 619 620 fullscan = 1; 621 for (i = 0; i < MAPLE_PORTS; i++) { 622 if (checked[i] == false) { 623 fullscan = 0; 624 mdev = baseunits[i]; 625 maple_add_packet(mdev, 0, MAPLE_COMMAND_DEVINFO, 626 0, NULL); 627 } 628 } 629 } 630 631 /* maple dma end bottom half - implemented via workqueue */ 632 static void maple_dma_handler(struct work_struct *work) 633 { 634 struct mapleq *mq, *nmq; 635 struct maple_device *mdev; 636 char *recvbuf; 637 enum maple_code code; 638 639 if (!maple_dma_done()) 640 return; 641 ctrl_outl(0, MAPLE_ENABLE); 642 if (!list_empty(&maple_sentq)) { 643 list_for_each_entry_safe(mq, nmq, &maple_sentq, list) { 644 mdev = mq->dev; 645 recvbuf = mq->recvbuf->buf; 646 dma_cache_sync(&mdev->dev, recvbuf, 0x400, 647 DMA_FROM_DEVICE); 648 code = recvbuf[0]; 649 kfree(mq->sendbuf); 650 list_del_init(&mq->list); 651 switch (code) { 652 case MAPLE_RESPONSE_NONE: 653 maple_response_none(mdev); 654 break; 655 656 case MAPLE_RESPONSE_DEVINFO: 657 maple_response_devinfo(mdev, recvbuf); 658 atomic_set(&mdev->busy, 0); 659 break; 660 661 case MAPLE_RESPONSE_DATATRF: 662 if (mdev->callback) 663 mdev->callback(mq); 664 atomic_set(&mdev->busy, 0); 665 wake_up(&mdev->maple_wait); 666 break; 667 668 case MAPLE_RESPONSE_FILEERR: 669 maple_response_fileerr(mdev, recvbuf); 670 atomic_set(&mdev->busy, 0); 671 wake_up(&mdev->maple_wait); 672 break; 673 674 case MAPLE_RESPONSE_AGAIN: 675 case MAPLE_RESPONSE_BADCMD: 676 case MAPLE_RESPONSE_BADFUNC: 677 dev_warn(&mdev->dev, "non-fatal error" 678 " 0x%X at (%d, %d)\n", code, 679 mdev->port, mdev->unit); 680 atomic_set(&mdev->busy, 0); 681 break; 682 683 case MAPLE_RESPONSE_ALLINFO: 684 dev_notice(&mdev->dev, "extended" 685 " device information request for (%d, %d)" 686 " but call is not supported\n", mdev->port, 687 mdev->unit); 688 atomic_set(&mdev->busy, 0); 689 break; 690 691 case MAPLE_RESPONSE_OK: 692 atomic_set(&mdev->busy, 0); 693 wake_up(&mdev->maple_wait); 694 break; 695 696 default: 697 break; 698 } 699 } 700 /* if scanning is 1 then we have subdevices to check */ 701 if (scanning == 1) { 702 maple_send(); 703 scanning = 2; 704 } else 705 scanning = 0; 706 /*check if we have actually tested all ports yet */ 707 if (!fullscan) 708 maple_port_rescan(); 709 /* mark that we have been through the first scan */ 710 started = 1; 711 } 712 maple_send(); 713 } 714 715 static irqreturn_t maple_dma_interrupt(int irq, void *dev_id) 716 { 717 /* Load everything into the bottom half */ 718 schedule_work(&maple_dma_process); 719 return IRQ_HANDLED; 720 } 721 722 static irqreturn_t maple_vblank_interrupt(int irq, void *dev_id) 723 { 724 schedule_work(&maple_vblank_process); 725 return IRQ_HANDLED; 726 } 727 728 static int maple_set_dma_interrupt_handler(void) 729 { 730 return request_irq(HW_EVENT_MAPLE_DMA, maple_dma_interrupt, 731 IRQF_SHARED, "maple bus DMA", &maple_unsupported_device); 732 } 733 734 static int maple_set_vblank_interrupt_handler(void) 735 { 736 return request_irq(HW_EVENT_VSYNC, maple_vblank_interrupt, 737 IRQF_SHARED, "maple bus VBLANK", &maple_unsupported_device); 738 } 739 740 static int maple_get_dma_buffer(void) 741 { 742 maple_sendbuf = 743 (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, 744 MAPLE_DMA_PAGES); 745 if (!maple_sendbuf) 746 return -ENOMEM; 747 return 0; 748 } 749 750 static int maple_match_bus_driver(struct device *devptr, 751 struct device_driver *drvptr) 752 { 753 struct maple_driver *maple_drv = to_maple_driver(drvptr); 754 struct maple_device *maple_dev = to_maple_dev(devptr); 755 756 /* Trap empty port case */ 757 if (maple_dev->devinfo.function == 0xFFFFFFFF) 758 return 0; 759 else if (maple_dev->devinfo.function & 760 cpu_to_be32(maple_drv->function)) 761 return 1; 762 return 0; 763 } 764 765 static int maple_bus_uevent(struct device *dev, 766 struct kobj_uevent_env *env) 767 { 768 return 0; 769 } 770 771 static void maple_bus_release(struct device *dev) 772 { 773 } 774 775 static struct maple_driver maple_unsupported_device = { 776 .drv = { 777 .name = "maple_unsupported_device", 778 .bus = &maple_bus_type, 779 }, 780 }; 781 /** 782 * maple_bus_type - core maple bus structure 783 */ 784 struct bus_type maple_bus_type = { 785 .name = "maple", 786 .match = maple_match_bus_driver, 787 .uevent = maple_bus_uevent, 788 }; 789 EXPORT_SYMBOL_GPL(maple_bus_type); 790 791 static struct device maple_bus = { 792 .bus_id = "maple", 793 .release = maple_bus_release, 794 }; 795 796 static int __init maple_bus_init(void) 797 { 798 int retval, i; 799 struct maple_device *mdev[MAPLE_PORTS]; 800 801 ctrl_outl(0, MAPLE_ENABLE); 802 803 retval = device_register(&maple_bus); 804 if (retval) 805 goto cleanup; 806 807 retval = bus_register(&maple_bus_type); 808 if (retval) 809 goto cleanup_device; 810 811 retval = driver_register(&maple_unsupported_device.drv); 812 if (retval) 813 goto cleanup_bus; 814 815 /* allocate memory for maple bus dma */ 816 retval = maple_get_dma_buffer(); 817 if (retval) { 818 dev_err(&maple_bus, "failed to allocate DMA buffers\n"); 819 goto cleanup_basic; 820 } 821 822 /* set up DMA interrupt handler */ 823 retval = maple_set_dma_interrupt_handler(); 824 if (retval) { 825 dev_err(&maple_bus, "bus failed to grab maple " 826 "DMA IRQ\n"); 827 goto cleanup_dma; 828 } 829 830 /* set up VBLANK interrupt handler */ 831 retval = maple_set_vblank_interrupt_handler(); 832 if (retval) { 833 dev_err(&maple_bus, "bus failed to grab VBLANK IRQ\n"); 834 goto cleanup_irq; 835 } 836 837 maple_queue_cache = KMEM_CACHE(maple_buffer, SLAB_HWCACHE_ALIGN); 838 839 if (!maple_queue_cache) 840 goto cleanup_bothirqs; 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 goto cleanup_cache; 854 } 855 baseunits[i] = mdev[i]; 856 atomic_set(&mdev[i]->busy, 1); 857 maple_add_packet(mdev[i], 0, MAPLE_COMMAND_DEVINFO, 0, NULL); 858 subdevice_map[i] = 0; 859 } 860 861 maple_pnp_time = jiffies + HZ; 862 /* prepare initial queue */ 863 maple_send(); 864 dev_info(&maple_bus, "bus core now registered\n"); 865 866 return 0; 867 868 cleanup_cache: 869 kmem_cache_destroy(maple_queue_cache); 870 871 cleanup_bothirqs: 872 free_irq(HW_EVENT_VSYNC, 0); 873 874 cleanup_irq: 875 free_irq(HW_EVENT_MAPLE_DMA, 0); 876 877 cleanup_dma: 878 free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES); 879 880 cleanup_basic: 881 driver_unregister(&maple_unsupported_device.drv); 882 883 cleanup_bus: 884 bus_unregister(&maple_bus_type); 885 886 cleanup_device: 887 device_unregister(&maple_bus); 888 889 cleanup: 890 printk(KERN_ERR "Maple bus registration failed\n"); 891 return retval; 892 } 893 /* Push init to later to ensure hardware gets detected */ 894 fs_initcall(maple_bus_init); 895