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iwlwifi: introduce host commands callbacks
[linux/fpc-iii.git] / drivers / sh / maple / maple.c
blob617efb1640b10375c9dc2362cff085beef85f596
1 /*
2 * Core maple bus functionality
3 *
4 * Copyright (C) 2007, 2008 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/interrupt.h>
22 #include <linux/list.h>
23 #include <linux/io.h>
24 #include <linux/slab.h>
25 #include <linux/maple.h>
26 #include <linux/dma-mapping.h>
27 #include <asm/cacheflush.h>
28 #include <asm/dma.h>
29 #include <asm/io.h>
30 #include <asm/mach/dma.h>
31 #include <asm/mach/sysasic.h>
32 #include <asm/mach/maple.h>
33 #include <linux/delay.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, fullscan;
57 static struct kmem_cache *maple_queue_cache;
58
59 struct maple_device_specify {
60 int port;
61 int unit;
62 };
63
64 static bool checked[4];
65 static struct maple_device *baseunits[4];
66
67 /**
68 * maple_driver_register - register a device driver
69 * automatically makes the driver bus a maple bus
70 * @drv: the driver to be registered
71 */
72 int maple_driver_register(struct device_driver *drv)
73 {
74 if (!drv)
75 return -EINVAL;
76 drv->bus = &maple_bus_type;
77 return driver_register(drv);
78 }
79 EXPORT_SYMBOL_GPL(maple_driver_register);
80
81 /* set hardware registers to enable next round of dma */
82 static void maplebus_dma_reset(void)
83 {
84 ctrl_outl(MAPLE_MAGIC, MAPLE_RESET);
85 /* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */
86 ctrl_outl(1, MAPLE_TRIGTYPE);
87 ctrl_outl(MAPLE_2MBPS | MAPLE_TIMEOUT(50000), MAPLE_SPEED);
88 ctrl_outl(PHYSADDR(maple_sendbuf), MAPLE_DMAADDR);
89 ctrl_outl(1, MAPLE_ENABLE);
90 }
91
92 /**
93 * maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND
94 * @dev: device responding
95 * @callback: handler callback
96 * @interval: interval in jiffies between callbacks
97 * @function: the function code for the device
98 */
99 void maple_getcond_callback(struct maple_device *dev,
100 void (*callback) (struct mapleq *mq),
101 unsigned long interval, unsigned long function)
102 {
103 dev->callback = callback;
104 dev->interval = interval;
105 dev->function = cpu_to_be32(function);
106 dev->when = jiffies;
107 }
108 EXPORT_SYMBOL_GPL(maple_getcond_callback);
109
110 static int maple_dma_done(void)
111 {
112 return (ctrl_inl(MAPLE_STATE) & 1) == 0;
113 }
114
115 static void maple_release_device(struct device *dev)
116 {
117 struct maple_device *mdev;
118 struct mapleq *mq;
119 if (!dev)
120 return;
121 mdev = to_maple_dev(dev);
122 mq = mdev->mq;
123 if (mq) {
124 if (mq->recvbufdcsp)
125 kmem_cache_free(maple_queue_cache, mq->recvbufdcsp);
126 kfree(mq);
127 mq = NULL;
128 }
129 kfree(mdev);
130 }
131
132 /**
133 * maple_add_packet - add a single instruction to the queue
134 * @mq: instruction to add to waiting queue
135 */
136 void maple_add_packet(struct mapleq *mq)
137 {
138 mutex_lock(&maple_list_lock);
139 list_add(&mq->list, &maple_waitq);
140 mutex_unlock(&maple_list_lock);
141 }
142 EXPORT_SYMBOL_GPL(maple_add_packet);
143
144 static struct mapleq *maple_allocq(struct maple_device *mdev)
145 {
146 struct mapleq *mq;
147
148 mq = kmalloc(sizeof(*mq), GFP_KERNEL);
149 if (!mq)
150 return NULL;
151
152 mq->dev = mdev;
153 mq->recvbufdcsp = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
154 mq->recvbuf = (void *) P2SEGADDR(mq->recvbufdcsp);
155 if (!mq->recvbuf) {
156 kfree(mq);
157 return NULL;
158 }
159
160 return mq;
161 }
162
163 static struct maple_device *maple_alloc_dev(int port, int unit)
164 {
165 struct maple_device *mdev;
166
167 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
168 if (!mdev)
169 return NULL;
170
171 mdev->port = port;
172 mdev->unit = unit;
173 mdev->mq = maple_allocq(mdev);
174
175 if (!mdev->mq) {
176 kfree(mdev);
177 return NULL;
178 }
179 mdev->dev.bus = &maple_bus_type;
180 mdev->dev.parent = &maple_bus;
181 mdev->function = 0;
182 return mdev;
183 }
184
185 static void maple_free_dev(struct maple_device *mdev)
186 {
187 if (!mdev)
188 return;
189 if (mdev->mq) {
190 if (mdev->mq->recvbufdcsp)
191 kmem_cache_free(maple_queue_cache,
192 mdev->mq->recvbufdcsp);
193 kfree(mdev->mq);
194 }
195 kfree(mdev);
196 }
197
198 /* process the command queue into a maple command block
199 * terminating command has bit 32 of first long set to 0
200 */
201 static void maple_build_block(struct mapleq *mq)
202 {
203 int port, unit, from, to, len;
204 unsigned long *lsendbuf = mq->sendbuf;
205
206 port = mq->dev->port & 3;
207 unit = mq->dev->unit;
208 len = mq->length;
209 from = port << 6;
210 to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20);
211
212 *maple_lastptr &= 0x7fffffff;
213 maple_lastptr = maple_sendptr;
214
215 *maple_sendptr++ = (port << 16) | len | 0x80000000;
216 *maple_sendptr++ = PHYSADDR(mq->recvbuf);
217 *maple_sendptr++ =
218 mq->command | (to << 8) | (from << 16) | (len << 24);
219
220 while (len-- > 0)
221 *maple_sendptr++ = *lsendbuf++;
222 }
223
224 /* build up command queue */
225 static void maple_send(void)
226 {
227 int i;
228 int maple_packets;
229 struct mapleq *mq, *nmq;
230
231 if (!list_empty(&maple_sentq))
232 return;
233 if (list_empty(&maple_waitq) || !maple_dma_done())
234 return;
235 maple_packets = 0;
236 maple_sendptr = maple_lastptr = maple_sendbuf;
237 list_for_each_entry_safe(mq, nmq, &maple_waitq, list) {
238 maple_build_block(mq);
239 list_move(&mq->list, &maple_sentq);
240 if (maple_packets++ > MAPLE_MAXPACKETS)
241 break;
242 }
243 if (maple_packets > 0) {
244 for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++)
245 dma_cache_sync(0, maple_sendbuf + i * PAGE_SIZE,
246 PAGE_SIZE, DMA_BIDIRECTIONAL);
247 }
248 }
249
250 static int attach_matching_maple_driver(struct device_driver *driver,
251 void *devptr)
252 {
253 struct maple_driver *maple_drv;
254 struct maple_device *mdev;
255
256 mdev = devptr;
257 maple_drv = to_maple_driver(driver);
258 if (mdev->devinfo.function & be32_to_cpu(maple_drv->function)) {
259 if (maple_drv->connect(mdev) == 0) {
260 mdev->driver = maple_drv;
261 return 1;
262 }
263 }
264 return 0;
265 }
266
267 static void maple_detach_driver(struct maple_device *mdev)
268 {
269 if (!mdev)
270 return;
271 if (mdev->driver) {
272 if (mdev->driver->disconnect)
273 mdev->driver->disconnect(mdev);
274 }
275 mdev->driver = NULL;
276 device_unregister(&mdev->dev);
277 mdev = NULL;
278 }
279
280 /* process initial MAPLE_COMMAND_DEVINFO for each device or port */
281 static void maple_attach_driver(struct maple_device *mdev)
282 {
283 char *p, *recvbuf;
284 unsigned long function;
285 int matched, retval;
286
287 recvbuf = mdev->mq->recvbuf;
288 /* copy the data as individual elements in
289 * case of memory optimisation */
290 memcpy(&mdev->devinfo.function, recvbuf + 4, 4);
291 memcpy(&mdev->devinfo.function_data[0], recvbuf + 8, 12);
292 memcpy(&mdev->devinfo.area_code, recvbuf + 20, 1);
293 memcpy(&mdev->devinfo.connector_direction, recvbuf + 21, 1);
294 memcpy(&mdev->devinfo.product_name[0], recvbuf + 22, 30);
295 memcpy(&mdev->devinfo.product_licence[0], recvbuf + 52, 60);
296 memcpy(&mdev->devinfo.standby_power, recvbuf + 112, 2);
297 memcpy(&mdev->devinfo.max_power, recvbuf + 114, 2);
298 memcpy(mdev->product_name, mdev->devinfo.product_name, 30);
299 mdev->product_name[30] = '\0';
300 memcpy(mdev->product_licence, mdev->devinfo.product_licence, 60);
301 mdev->product_licence[60] = '\0';
302
303 for (p = mdev->product_name + 29; mdev->product_name <= p; p--)
304 if (*p == ' ')
305 *p = '\0';
306 else
307 break;
308 for (p = mdev->product_licence + 59; mdev->product_licence <= p; p--)
309 if (*p == ' ')
310 *p = '\0';
311 else
312 break;
313
314 printk(KERN_INFO "Maple device detected: %s\n",
315 mdev->product_name);
316 printk(KERN_INFO "Maple device: %s\n", mdev->product_licence);
317
318 function = be32_to_cpu(mdev->devinfo.function);
319
320 if (function > 0x200) {
321 /* Do this silently - as not a real device */
322 function = 0;
323 mdev->driver = &maple_dummy_driver;
324 sprintf(mdev->dev.bus_id, "%d:0.port", mdev->port);
325 } else {
326 printk(KERN_INFO
327 "Maple bus at (%d, %d): Function 0x%lX\n",
328 mdev->port, mdev->unit, function);
329
330 matched =
331 bus_for_each_drv(&maple_bus_type, NULL, mdev,
332 attach_matching_maple_driver);
333
334 if (matched == 0) {
335 /* Driver does not exist yet */
336 printk(KERN_INFO
337 "No maple driver found.\n");
338 mdev->driver = &maple_dummy_driver;
339 }
340 sprintf(mdev->dev.bus_id, "%d:0%d.%lX", mdev->port,
341 mdev->unit, function);
342 }
343 mdev->function = function;
344 mdev->dev.release = &maple_release_device;
345 retval = device_register(&mdev->dev);
346 if (retval) {
347 printk(KERN_INFO
348 "Maple bus: Attempt to register device"
349 " (%x, %x) failed.\n",
350 mdev->port, mdev->unit);
351 maple_free_dev(mdev);
352 mdev = NULL;
353 return;
354 }
355 }
356
357 /*
358 * if device has been registered for the given
359 * port and unit then return 1 - allows identification
360 * of which devices need to be attached or detached
361 */
362 static int detach_maple_device(struct device *device, void *portptr)
363 {
364 struct maple_device_specify *ds;
365 struct maple_device *mdev;
366
367 ds = portptr;
368 mdev = to_maple_dev(device);
369 if (mdev->port == ds->port && mdev->unit == ds->unit)
370 return 1;
371 return 0;
372 }
373
374 static int setup_maple_commands(struct device *device, void *ignored)
375 {
376 struct maple_device *maple_dev = to_maple_dev(device);
377
378 if ((maple_dev->interval > 0)
379 && time_after(jiffies, maple_dev->when)) {
380 maple_dev->when = jiffies + maple_dev->interval;
381 maple_dev->mq->command = MAPLE_COMMAND_GETCOND;
382 maple_dev->mq->sendbuf = &maple_dev->function;
383 maple_dev->mq->length = 1;
384 maple_add_packet(maple_dev->mq);
385 liststatus++;
386 } else {
387 if (time_after(jiffies, maple_pnp_time)) {
388 maple_dev->mq->command = MAPLE_COMMAND_DEVINFO;
389 maple_dev->mq->length = 0;
390 maple_add_packet(maple_dev->mq);
391 liststatus++;
392 }
393 }
394
395 return 0;
396 }
397
398 /* VBLANK bottom half - implemented via workqueue */
399 static void maple_vblank_handler(struct work_struct *work)
400 {
401 if (!maple_dma_done())
402 return;
403 if (!list_empty(&maple_sentq))
404 return;
405 ctrl_outl(0, MAPLE_ENABLE);
406 liststatus = 0;
407 bus_for_each_dev(&maple_bus_type, NULL, NULL,
408 setup_maple_commands);
409 if (time_after(jiffies, maple_pnp_time))
410 maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL;
411 if (liststatus && list_empty(&maple_sentq)) {
412 INIT_LIST_HEAD(&maple_sentq);
413 maple_send();
414 }
415 maplebus_dma_reset();
416 }
417
418 /* handle devices added via hotplugs - placing them on queue for DEVINFO*/
419 static void maple_map_subunits(struct maple_device *mdev, int submask)
420 {
421 int retval, k, devcheck;
422 struct maple_device *mdev_add;
423 struct maple_device_specify ds;
424
425 for (k = 0; k < 5; k++) {
426 ds.port = mdev->port;
427 ds.unit = k + 1;
428 retval =
429 bus_for_each_dev(&maple_bus_type, NULL, &ds,
430 detach_maple_device);
431 if (retval) {
432 submask = submask >> 1;
433 continue;
434 }
435 devcheck = submask & 0x01;
436 if (devcheck) {
437 mdev_add = maple_alloc_dev(mdev->port, k + 1);
438 if (!mdev_add)
439 return;
440 mdev_add->mq->command = MAPLE_COMMAND_DEVINFO;
441 mdev_add->mq->length = 0;
442 maple_add_packet(mdev_add->mq);
443 scanning = 1;
444 }
445 submask = submask >> 1;
446 }
447 }
448
449 /* mark a device as removed */
450 static void maple_clean_submap(struct maple_device *mdev)
451 {
452 int killbit;
453
454 killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20);
455 killbit = ~killbit;
456 killbit &= 0xFF;
457 subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit;
458 }
459
460 /* handle empty port or hotplug removal */
461 static void maple_response_none(struct maple_device *mdev,
462 struct mapleq *mq)
463 {
464 if (mdev->unit != 0) {
465 list_del(&mq->list);
466 maple_clean_submap(mdev);
467 printk(KERN_INFO
468 "Maple bus device detaching at (%d, %d)\n",
469 mdev->port, mdev->unit);
470 maple_detach_driver(mdev);
471 return;
472 }
473 if (!started || !fullscan) {
474 if (checked[mdev->port] == false) {
475 checked[mdev->port] = true;
476 printk(KERN_INFO "No maple devices attached"
477 " to port %d\n", mdev->port);
478 }
479 return;
480 }
481 maple_clean_submap(mdev);
482 }
483
484 /* preprocess hotplugs or scans */
485 static void maple_response_devinfo(struct maple_device *mdev,
486 char *recvbuf)
487 {
488 char submask;
489 if (!started || (scanning == 2) || !fullscan) {
490 if ((mdev->unit == 0) && (checked[mdev->port] == false)) {
491 checked[mdev->port] = true;
492 maple_attach_driver(mdev);
493 } else {
494 if (mdev->unit != 0)
495 maple_attach_driver(mdev);
496 }
497 return;
498 }
499 if (mdev->unit == 0) {
500 submask = recvbuf[2] & 0x1F;
501 if (submask ^ subdevice_map[mdev->port]) {
502 maple_map_subunits(mdev, submask);
503 subdevice_map[mdev->port] = submask;
504 }
505 }
506 }
507
508 /* maple dma end bottom half - implemented via workqueue */
509 static void maple_dma_handler(struct work_struct *work)
510 {
511 struct mapleq *mq, *nmq;
512 struct maple_device *dev;
513 char *recvbuf;
514 enum maple_code code;
515 int i;
516
517 if (!maple_dma_done())
518 return;
519 ctrl_outl(0, MAPLE_ENABLE);
520 if (!list_empty(&maple_sentq)) {
521 list_for_each_entry_safe(mq, nmq, &maple_sentq, list) {
522 recvbuf = mq->recvbuf;
523 code = recvbuf[0];
524 dev = mq->dev;
525 switch (code) {
526 case MAPLE_RESPONSE_NONE:
527 maple_response_none(dev, mq);
528 break;
529
530 case MAPLE_RESPONSE_DEVINFO:
531 maple_response_devinfo(dev, recvbuf);
532 break;
533
534 case MAPLE_RESPONSE_DATATRF:
535 if (dev->callback)
536 dev->callback(mq);
537 break;
538
539 case MAPLE_RESPONSE_FILEERR:
540 case MAPLE_RESPONSE_AGAIN:
541 case MAPLE_RESPONSE_BADCMD:
542 case MAPLE_RESPONSE_BADFUNC:
543 printk(KERN_DEBUG
544 "Maple non-fatal error 0x%X\n",
545 code);
546 break;
547
548 case MAPLE_RESPONSE_ALLINFO:
549 printk(KERN_DEBUG
550 "Maple - extended device information"
551 " not supported\n");
552 break;
553
554 case MAPLE_RESPONSE_OK:
555 break;
556
557 default:
558 break;
559 }
560 }
561 INIT_LIST_HEAD(&maple_sentq);
562 if (scanning == 1) {
563 maple_send();
564 scanning = 2;
565 } else
566 scanning = 0;
567
568 if (!fullscan) {
569 fullscan = 1;
570 for (i = 0; i < MAPLE_PORTS; i++) {
571 if (checked[i] == false) {
572 fullscan = 0;
573 dev = baseunits[i];
574 dev->mq->command =
575 MAPLE_COMMAND_DEVINFO;
576 dev->mq->length = 0;
577 maple_add_packet(dev->mq);
578 }
579 }
580 }
581 if (started == 0)
582 started = 1;
583 }
584 maplebus_dma_reset();
585 }
586
587 static irqreturn_t maplebus_dma_interrupt(int irq, void *dev_id)
588 {
589 /* Load everything into the bottom half */
590 schedule_work(&maple_dma_process);
591 return IRQ_HANDLED;
592 }
593
594 static irqreturn_t maplebus_vblank_interrupt(int irq, void *dev_id)
595 {
596 schedule_work(&maple_vblank_process);
597 return IRQ_HANDLED;
598 }
599
600 static int maple_set_dma_interrupt_handler(void)
601 {
602 return request_irq(HW_EVENT_MAPLE_DMA, maplebus_dma_interrupt,
603 IRQF_SHARED, "maple bus DMA", &maple_dummy_driver);
604 }
605
606 static int maple_set_vblank_interrupt_handler(void)
607 {
608 return request_irq(HW_EVENT_VSYNC, maplebus_vblank_interrupt,
609 IRQF_SHARED, "maple bus VBLANK", &maple_dummy_driver);
610 }
611
612 static int maple_get_dma_buffer(void)
613 {
614 maple_sendbuf =
615 (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
616 MAPLE_DMA_PAGES);
617 if (!maple_sendbuf)
618 return -ENOMEM;
619 return 0;
620 }
621
622 static int match_maple_bus_driver(struct device *devptr,
623 struct device_driver *drvptr)
624 {
625 struct maple_driver *maple_drv;
626 struct maple_device *maple_dev;
627
628 maple_drv = container_of(drvptr, struct maple_driver, drv);
629 maple_dev = container_of(devptr, struct maple_device, dev);
630 /* Trap empty port case */
631 if (maple_dev->devinfo.function == 0xFFFFFFFF)
632 return 0;
633 else if (maple_dev->devinfo.function &
634 be32_to_cpu(maple_drv->function))
635 return 1;
636 return 0;
637 }
638
639 static int maple_bus_uevent(struct device *dev,
640 struct kobj_uevent_env *env)
641 {
642 return 0;
643 }
644
645 static void maple_bus_release(struct device *dev)
646 {
647 }
648
649 static struct maple_driver maple_dummy_driver = {
650 .drv = {
651 .name = "maple_dummy_driver",
652 .bus = &maple_bus_type,
653 },
654 };
655
656 struct bus_type maple_bus_type = {
657 .name = "maple",
658 .match = match_maple_bus_driver,
659 .uevent = maple_bus_uevent,
660 };
661 EXPORT_SYMBOL_GPL(maple_bus_type);
662
663 static struct device maple_bus = {
664 .bus_id = "maple",
665 .release = maple_bus_release,
666 };
667
668 static int __init maple_bus_init(void)
669 {
670 int retval, i;
671 struct maple_device *mdev[MAPLE_PORTS];
672 ctrl_outl(0, MAPLE_STATE);
673
674 retval = device_register(&maple_bus);
675 if (retval)
676 goto cleanup;
677
678 retval = bus_register(&maple_bus_type);
679 if (retval)
680 goto cleanup_device;
681
682 retval = driver_register(&maple_dummy_driver.drv);
683 if (retval)
684 goto cleanup_bus;
685
686 /* allocate memory for maple bus dma */
687 retval = maple_get_dma_buffer();
688 if (retval) {
689 printk(KERN_INFO
690 "Maple bus: Failed to allocate Maple DMA buffers\n");
691 goto cleanup_basic;
692 }
693
694 /* set up DMA interrupt handler */
695 retval = maple_set_dma_interrupt_handler();
696 if (retval) {
697 printk(KERN_INFO
698 "Maple bus: Failed to grab maple DMA IRQ\n");
699 goto cleanup_dma;
700 }
701
702 /* set up VBLANK interrupt handler */
703 retval = maple_set_vblank_interrupt_handler();
704 if (retval) {
705 printk(KERN_INFO "Maple bus: Failed to grab VBLANK IRQ\n");
706 goto cleanup_irq;
707 }
708
709 maple_queue_cache =
710 kmem_cache_create("maple_queue_cache", 0x400, 0,
711 SLAB_POISON|SLAB_HWCACHE_ALIGN, NULL);
712
713 if (!maple_queue_cache)
714 goto cleanup_bothirqs;
715
716 /* setup maple ports */
717 for (i = 0; i < MAPLE_PORTS; i++) {
718 checked[i] = false;
719 mdev[i] = maple_alloc_dev(i, 0);
720 baseunits[i] = mdev[i];
721 if (!mdev[i]) {
722 while (i-- > 0)
723 maple_free_dev(mdev[i]);
724 goto cleanup_cache;
725 }
726 mdev[i]->mq->command = MAPLE_COMMAND_DEVINFO;
727 mdev[i]->mq->length = 0;
728 maple_add_packet(mdev[i]->mq);
729 subdevice_map[i] = 0;
730 }
731
732 /* setup maplebus hardware */
733 maplebus_dma_reset();
734 /* initial detection */
735 maple_send();
736 maple_pnp_time = jiffies;
737 printk(KERN_INFO "Maple bus core now registered.\n");
738
739 return 0;
740
741 cleanup_cache:
742 kmem_cache_destroy(maple_queue_cache);
743
744 cleanup_bothirqs:
745 free_irq(HW_EVENT_VSYNC, 0);
746
747 cleanup_irq:
748 free_irq(HW_EVENT_MAPLE_DMA, 0);
749
750 cleanup_dma:
751 free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES);
752
753 cleanup_basic:
754 driver_unregister(&maple_dummy_driver.drv);
755
756 cleanup_bus:
757 bus_unregister(&maple_bus_type);
758
759 cleanup_device:
760 device_unregister(&maple_bus);
761
762 cleanup:
763 printk(KERN_INFO "Maple bus registration failed\n");
764 return retval;
765 }
766 /* Push init to later to ensure hardware gets detected */
767 fs_initcall(maple_bus_init);
Linux with added FPC-III support