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netdev: convert loopback to net_device_ops
[linux-2.6/x86.git] / drivers / sh / maple / maple.c
blobd1812d32f47d40c4c5e3c028aae8727c755f451f
1 /*
2 * Core maple bus functionality
3 *
4 * Copyright (C) 2007, 2008 Adrian McMenamin
5 * Copyright (C) 2001 - 2008 Paul Mundt
6 *
7 * Based on 2.4 code by:
8 *
9 * Copyright (C) 2000-2001 YAEGASHI Takeshi
10 * Copyright (C) 2001 M. R. Brown
11 * Copyright (C) 2001 Paul Mundt
12 *
13 * and others.
14 *
15 * This file is subject to the terms and conditions of the GNU General Public
16 * License. See the file "COPYING" in the main directory of this archive
17 * for more details.
18 */
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/device.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 <linux/delay.h>
29 #include <asm/cacheflush.h>
30 #include <asm/dma.h>
31 #include <asm/io.h>
32 #include <mach/dma.h>
33 #include <mach/sysasic.h>
34
35 MODULE_AUTHOR("Yaegashi 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 /* mutex to protect queue of waiting packets */
50 static DEFINE_MUTEX(maple_wlist_lock);
51
52 static struct maple_driver maple_dummy_driver;
53 static struct device maple_bus;
54 static int subdevice_map[MAPLE_PORTS];
55 static unsigned long *maple_sendbuf, *maple_sendptr, *maple_lastptr;
56 static unsigned long maple_pnp_time;
57 static int started, scanning, fullscan;
58 static struct kmem_cache *maple_queue_cache;
59
60 struct maple_device_specify {
61 int port;
62 int unit;
63 };
64
65 static bool checked[4];
66 static struct maple_device *baseunits[4];
67
68 /**
69 * maple_driver_register - register a maple driver
70 * @drv: maple driver to be registered.
71 *
72 * Registers the passed in @drv, while updating the bus type.
73 * Devices with matching function IDs will be automatically probed.
74 */
75 int maple_driver_register(struct maple_driver *drv)
76 {
77 if (!drv)
78 return -EINVAL;
79
80 drv->drv.bus = &maple_bus_type;
81
82 return driver_register(&drv->drv);
83 }
84 EXPORT_SYMBOL_GPL(maple_driver_register);
85
86 /**
87 * maple_driver_unregister - unregister a maple driver.
88 * @drv: maple driver to unregister.
89 *
90 * Cleans up after maple_driver_register(). To be invoked in the exit
91 * path of any module drivers.
92 */
93 void maple_driver_unregister(struct maple_driver *drv)
94 {
95 driver_unregister(&drv->drv);
96 }
97 EXPORT_SYMBOL_GPL(maple_driver_unregister);
98
99 /* set hardware registers to enable next round of dma */
100 static void maplebus_dma_reset(void)
101 {
102 ctrl_outl(MAPLE_MAGIC, MAPLE_RESET);
103 /* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */
104 ctrl_outl(1, MAPLE_TRIGTYPE);
105 ctrl_outl(MAPLE_2MBPS | MAPLE_TIMEOUT(50000), MAPLE_SPEED);
106 ctrl_outl(PHYSADDR(maple_sendbuf), MAPLE_DMAADDR);
107 ctrl_outl(1, MAPLE_ENABLE);
108 }
109
110 /**
111 * maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND
112 * @dev: device responding
113 * @callback: handler callback
114 * @interval: interval in jiffies between callbacks
115 * @function: the function code for the device
116 */
117 void maple_getcond_callback(struct maple_device *dev,
118 void (*callback) (struct mapleq *mq),
119 unsigned long interval, unsigned long function)
120 {
121 dev->callback = callback;
122 dev->interval = interval;
123 dev->function = cpu_to_be32(function);
124 dev->when = jiffies;
125 }
126 EXPORT_SYMBOL_GPL(maple_getcond_callback);
127
128 static int maple_dma_done(void)
129 {
130 return (ctrl_inl(MAPLE_STATE) & 1) == 0;
131 }
132
133 static void maple_release_device(struct device *dev)
134 {
135 struct maple_device *mdev;
136 struct mapleq *mq;
137 if (!dev)
138 return;
139 mdev = to_maple_dev(dev);
140 mq = mdev->mq;
141 if (mq) {
142 if (mq->recvbufdcsp)
143 kmem_cache_free(maple_queue_cache, mq->recvbufdcsp);
144 kfree(mq);
145 mq = NULL;
146 }
147 kfree(mdev);
148 }
149
150 /**
151 * maple_add_packet - add a single instruction to the queue
152 * @mdev: maple device
153 * @function: function on device being queried
154 * @command: maple command to add
155 * @length: length of command string (in 32 bit words)
156 * @data: remainder of command string
157 */
158 int maple_add_packet(struct maple_device *mdev, u32 function, u32 command,
159 size_t length, void *data)
160 {
161 int locking, ret = 0;
162 void *sendbuf = NULL;
163
164 mutex_lock(&maple_wlist_lock);
165 /* bounce if device already locked */
166 locking = mutex_is_locked(&mdev->mq->mutex);
167 if (locking) {
168 ret = -EBUSY;
169 goto out;
170 }
171
172 mutex_lock(&mdev->mq->mutex);
173
174 if (length) {
175 sendbuf = kmalloc(length * 4, GFP_KERNEL);
176 if (!sendbuf) {
177 mutex_unlock(&mdev->mq->mutex);
178 ret = -ENOMEM;
179 goto out;
180 }
181 ((__be32 *)sendbuf)[0] = cpu_to_be32(function);
182 }
183
184 mdev->mq->command = command;
185 mdev->mq->length = length;
186 if (length > 1)
187 memcpy(sendbuf + 4, data, (length - 1) * 4);
188 mdev->mq->sendbuf = sendbuf;
189
190 list_add(&mdev->mq->list, &maple_waitq);
191 out:
192 mutex_unlock(&maple_wlist_lock);
193 return ret;
194 }
195 EXPORT_SYMBOL_GPL(maple_add_packet);
196
197 /**
198 * maple_add_packet_sleeps - add a single instruction to the queue
199 * @mdev: maple device
200 * @function: function on device being queried
201 * @command: maple command to add
202 * @length: length of command string (in 32 bit words)
203 * @data: remainder of command string
204 *
205 * Same as maple_add_packet(), but waits for the lock to become free.
206 */
207 int maple_add_packet_sleeps(struct maple_device *mdev, u32 function,
208 u32 command, size_t length, void *data)
209 {
210 int locking, ret = 0;
211 void *sendbuf = NULL;
212
213 locking = mutex_lock_interruptible(&mdev->mq->mutex);
214 if (locking) {
215 ret = -EIO;
216 goto out;
217 }
218
219 if (length) {
220 sendbuf = kmalloc(length * 4, GFP_KERNEL);
221 if (!sendbuf) {
222 mutex_unlock(&mdev->mq->mutex);
223 ret = -ENOMEM;
224 goto out;
225 }
226 ((__be32 *)sendbuf)[0] = cpu_to_be32(function);
227 }
228
229 mdev->mq->command = command;
230 mdev->mq->length = length;
231 if (length > 1)
232 memcpy(sendbuf + 4, data, (length - 1) * 4);
233 mdev->mq->sendbuf = sendbuf;
234
235 mutex_lock(&maple_wlist_lock);
236 list_add(&mdev->mq->list, &maple_waitq);
237 mutex_unlock(&maple_wlist_lock);
238 out:
239 return ret;
240 }
241 EXPORT_SYMBOL_GPL(maple_add_packet_sleeps);
242
243 static struct mapleq *maple_allocq(struct maple_device *mdev)
244 {
245 struct mapleq *mq;
246
247 mq = kmalloc(sizeof(*mq), GFP_KERNEL);
248 if (!mq)
249 goto failed_nomem;
250
251 mq->dev = mdev;
252 mq->recvbufdcsp = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
253 mq->recvbuf = (void *) P2SEGADDR(mq->recvbufdcsp);
254 if (!mq->recvbuf)
255 goto failed_p2;
256 /*
257 * most devices do not need the mutex - but
258 * anything that injects block reads or writes
259 * will rely on it
260 */
261 mutex_init(&mq->mutex);
262
263 return mq;
264
265 failed_p2:
266 kfree(mq);
267 failed_nomem:
268 return NULL;
269 }
270
271 static struct maple_device *maple_alloc_dev(int port, int unit)
272 {
273 struct maple_device *mdev;
274
275 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
276 if (!mdev)
277 return NULL;
278
279 mdev->port = port;
280 mdev->unit = unit;
281 mdev->mq = maple_allocq(mdev);
282
283 if (!mdev->mq) {
284 kfree(mdev);
285 return NULL;
286 }
287 mdev->dev.bus = &maple_bus_type;
288 mdev->dev.parent = &maple_bus;
289 return mdev;
290 }
291
292 static void maple_free_dev(struct maple_device *mdev)
293 {
294 if (!mdev)
295 return;
296 if (mdev->mq) {
297 if (mdev->mq->recvbufdcsp)
298 kmem_cache_free(maple_queue_cache,
299 mdev->mq->recvbufdcsp);
300 kfree(mdev->mq);
301 }
302 kfree(mdev);
303 }
304
305 /* process the command queue into a maple command block
306 * terminating command has bit 32 of first long set to 0
307 */
308 static void maple_build_block(struct mapleq *mq)
309 {
310 int port, unit, from, to, len;
311 unsigned long *lsendbuf = mq->sendbuf;
312
313 port = mq->dev->port & 3;
314 unit = mq->dev->unit;
315 len = mq->length;
316 from = port << 6;
317 to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20);
318
319 *maple_lastptr &= 0x7fffffff;
320 maple_lastptr = maple_sendptr;
321
322 *maple_sendptr++ = (port << 16) | len | 0x80000000;
323 *maple_sendptr++ = PHYSADDR(mq->recvbuf);
324 *maple_sendptr++ =
325 mq->command | (to << 8) | (from << 16) | (len << 24);
326 while (len-- > 0)
327 *maple_sendptr++ = *lsendbuf++;
328 }
329
330 /* build up command queue */
331 static void maple_send(void)
332 {
333 int i, maple_packets = 0;
334 struct mapleq *mq, *nmq;
335
336 if (!list_empty(&maple_sentq))
337 return;
338 mutex_lock(&maple_wlist_lock);
339 if (list_empty(&maple_waitq) || !maple_dma_done()) {
340 mutex_unlock(&maple_wlist_lock);
341 return;
342 }
343 mutex_unlock(&maple_wlist_lock);
344 maple_lastptr = maple_sendbuf;
345 maple_sendptr = maple_sendbuf;
346 mutex_lock(&maple_wlist_lock);
347 list_for_each_entry_safe(mq, nmq, &maple_waitq, list) {
348 maple_build_block(mq);
349 list_move(&mq->list, &maple_sentq);
350 if (maple_packets++ > MAPLE_MAXPACKETS)
351 break;
352 }
353 mutex_unlock(&maple_wlist_lock);
354 if (maple_packets > 0) {
355 for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++)
356 dma_cache_sync(0, maple_sendbuf + i * PAGE_SIZE,
357 PAGE_SIZE, DMA_BIDIRECTIONAL);
358 }
359 }
360
361 /* check if there is a driver registered likely to match this device */
362 static int check_matching_maple_driver(struct device_driver *driver,
363 void *devptr)
364 {
365 struct maple_driver *maple_drv;
366 struct maple_device *mdev;
367
368 mdev = devptr;
369 maple_drv = to_maple_driver(driver);
370 if (mdev->devinfo.function & cpu_to_be32(maple_drv->function))
371 return 1;
372 return 0;
373 }
374
375 static void maple_detach_driver(struct maple_device *mdev)
376 {
377 if (!mdev)
378 return;
379 device_unregister(&mdev->dev);
380 mdev = NULL;
381 }
382
383 /* process initial MAPLE_COMMAND_DEVINFO for each device or port */
384 static void maple_attach_driver(struct maple_device *mdev)
385 {
386 char *p, *recvbuf;
387 unsigned long function;
388 int matched, retval;
389
390 recvbuf = mdev->mq->recvbuf;
391 /* copy the data as individual elements in
392 * case of memory optimisation */
393 memcpy(&mdev->devinfo.function, recvbuf + 4, 4);
394 memcpy(&mdev->devinfo.function_data[0], recvbuf + 8, 12);
395 memcpy(&mdev->devinfo.area_code, recvbuf + 20, 1);
396 memcpy(&mdev->devinfo.connector_direction, recvbuf + 21, 1);
397 memcpy(&mdev->devinfo.product_name[0], recvbuf + 22, 30);
398 memcpy(&mdev->devinfo.product_licence[0], recvbuf + 52, 60);
399 memcpy(&mdev->devinfo.standby_power, recvbuf + 112, 2);
400 memcpy(&mdev->devinfo.max_power, recvbuf + 114, 2);
401 memcpy(mdev->product_name, mdev->devinfo.product_name, 30);
402 mdev->product_name[30] = '\0';
403 memcpy(mdev->product_licence, mdev->devinfo.product_licence, 60);
404 mdev->product_licence[60] = '\0';
405
406 for (p = mdev->product_name + 29; mdev->product_name <= p; p--)
407 if (*p == ' ')
408 *p = '\0';
409 else
410 break;
411 for (p = mdev->product_licence + 59; mdev->product_licence <= p; p--)
412 if (*p == ' ')
413 *p = '\0';
414 else
415 break;
416
417 printk(KERN_INFO "Maple device detected: %s\n",
418 mdev->product_name);
419 printk(KERN_INFO "Maple device: %s\n", mdev->product_licence);
420
421 function = be32_to_cpu(mdev->devinfo.function);
422
423 if (function > 0x200) {
424 /* Do this silently - as not a real device */
425 function = 0;
426 mdev->driver = &maple_dummy_driver;
427 sprintf(mdev->dev.bus_id, "%d:0.port", mdev->port);
428 } else {
429 printk(KERN_INFO
430 "Maple bus at (%d, %d): Function 0x%lX\n",
431 mdev->port, mdev->unit, function);
432
433 matched =
434 bus_for_each_drv(&maple_bus_type, NULL, mdev,
435 check_matching_maple_driver);
436
437 if (matched == 0) {
438 /* Driver does not exist yet */
439 printk(KERN_INFO
440 "No maple driver found.\n");
441 mdev->driver = &maple_dummy_driver;
442 }
443 sprintf(mdev->dev.bus_id, "%d:0%d.%lX", mdev->port,
444 mdev->unit, function);
445 }
446 mdev->function = function;
447 mdev->dev.release = &maple_release_device;
448 retval = device_register(&mdev->dev);
449 if (retval) {
450 printk(KERN_INFO
451 "Maple bus: Attempt to register device"
452 " (%x, %x) failed.\n",
453 mdev->port, mdev->unit);
454 maple_free_dev(mdev);
455 mdev = NULL;
456 return;
457 }
458 }
459
460 /*
461 * if device has been registered for the given
462 * port and unit then return 1 - allows identification
463 * of which devices need to be attached or detached
464 */
465 static int detach_maple_device(struct device *device, void *portptr)
466 {
467 struct maple_device_specify *ds;
468 struct maple_device *mdev;
469
470 ds = portptr;
471 mdev = to_maple_dev(device);
472 if (mdev->port == ds->port && mdev->unit == ds->unit)
473 return 1;
474 return 0;
475 }
476
477 static int setup_maple_commands(struct device *device, void *ignored)
478 {
479 int add;
480 struct maple_device *maple_dev = to_maple_dev(device);
481
482 if ((maple_dev->interval > 0)
483 && time_after(jiffies, maple_dev->when)) {
484 /* bounce if we cannot lock */
485 add = maple_add_packet(maple_dev,
486 be32_to_cpu(maple_dev->devinfo.function),
487 MAPLE_COMMAND_GETCOND, 1, NULL);
488 if (!add)
489 maple_dev->when = jiffies + maple_dev->interval;
490 } else {
491 if (time_after(jiffies, maple_pnp_time))
492 /* This will also bounce */
493 maple_add_packet(maple_dev, 0,
494 MAPLE_COMMAND_DEVINFO, 0, NULL);
495 }
496 return 0;
497 }
498
499 /* VBLANK bottom half - implemented via workqueue */
500 static void maple_vblank_handler(struct work_struct *work)
501 {
502 if (!list_empty(&maple_sentq) || !maple_dma_done())
503 return;
504
505 ctrl_outl(0, MAPLE_ENABLE);
506
507 bus_for_each_dev(&maple_bus_type, NULL, NULL,
508 setup_maple_commands);
509
510 if (time_after(jiffies, maple_pnp_time))
511 maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL;
512
513 mutex_lock(&maple_wlist_lock);
514 if (!list_empty(&maple_waitq) && list_empty(&maple_sentq)) {
515 mutex_unlock(&maple_wlist_lock);
516 maple_send();
517 } else {
518 mutex_unlock(&maple_wlist_lock);
519 }
520
521 maplebus_dma_reset();
522 }
523
524 /* handle devices added via hotplugs - placing them on queue for DEVINFO*/
525 static void maple_map_subunits(struct maple_device *mdev, int submask)
526 {
527 int retval, k, devcheck;
528 struct maple_device *mdev_add;
529 struct maple_device_specify ds;
530
531 ds.port = mdev->port;
532 for (k = 0; k < 5; k++) {
533 ds.unit = k + 1;
534 retval =
535 bus_for_each_dev(&maple_bus_type, NULL, &ds,
536 detach_maple_device);
537 if (retval) {
538 submask = submask >> 1;
539 continue;
540 }
541 devcheck = submask & 0x01;
542 if (devcheck) {
543 mdev_add = maple_alloc_dev(mdev->port, k + 1);
544 if (!mdev_add)
545 return;
546 maple_add_packet(mdev_add, 0, MAPLE_COMMAND_DEVINFO,
547 0, NULL);
548 /* mark that we are checking sub devices */
549 scanning = 1;
550 }
551 submask = submask >> 1;
552 }
553 }
554
555 /* mark a device as removed */
556 static void maple_clean_submap(struct maple_device *mdev)
557 {
558 int killbit;
559
560 killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20);
561 killbit = ~killbit;
562 killbit &= 0xFF;
563 subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit;
564 }
565
566 /* handle empty port or hotplug removal */
567 static void maple_response_none(struct maple_device *mdev,
568 struct mapleq *mq)
569 {
570 if (mdev->unit != 0) {
571 list_del(&mq->list);
572 maple_clean_submap(mdev);
573 printk(KERN_INFO
574 "Maple bus device detaching at (%d, %d)\n",
575 mdev->port, mdev->unit);
576 maple_detach_driver(mdev);
577 return;
578 }
579 if (!started || !fullscan) {
580 if (checked[mdev->port] == false) {
581 checked[mdev->port] = true;
582 printk(KERN_INFO "No maple devices attached"
583 " to port %d\n", mdev->port);
584 }
585 return;
586 }
587 maple_clean_submap(mdev);
588 }
589
590 /* preprocess hotplugs or scans */
591 static void maple_response_devinfo(struct maple_device *mdev,
592 char *recvbuf)
593 {
594 char submask;
595 if (!started || (scanning == 2) || !fullscan) {
596 if ((mdev->unit == 0) && (checked[mdev->port] == false)) {
597 checked[mdev->port] = true;
598 maple_attach_driver(mdev);
599 } else {
600 if (mdev->unit != 0)
601 maple_attach_driver(mdev);
602 }
603 return;
604 }
605 if (mdev->unit == 0) {
606 submask = recvbuf[2] & 0x1F;
607 if (submask ^ subdevice_map[mdev->port]) {
608 maple_map_subunits(mdev, submask);
609 subdevice_map[mdev->port] = submask;
610 }
611 }
612 }
613
614 static void maple_port_rescan(void)
615 {
616 int i;
617 struct maple_device *mdev;
618
619 fullscan = 1;
620 for (i = 0; i < MAPLE_PORTS; i++) {
621 if (checked[i] == false) {
622 fullscan = 0;
623 mdev = baseunits[i];
624 /*
625 * test lock in case scan has failed
626 * but device is still locked
627 */
628 if (mutex_is_locked(&mdev->mq->mutex))
629 mutex_unlock(&mdev->mq->mutex);
630 maple_add_packet(mdev, 0, MAPLE_COMMAND_DEVINFO,
631 0, NULL);
632 }
633 }
634 }
635
636 /* maple dma end bottom half - implemented via workqueue */
637 static void maple_dma_handler(struct work_struct *work)
638 {
639 struct mapleq *mq, *nmq;
640 struct maple_device *dev;
641 char *recvbuf;
642 enum maple_code code;
643
644 if (!maple_dma_done())
645 return;
646 ctrl_outl(0, MAPLE_ENABLE);
647 if (!list_empty(&maple_sentq)) {
648 list_for_each_entry_safe(mq, nmq, &maple_sentq, list) {
649 recvbuf = mq->recvbuf;
650 code = recvbuf[0];
651 dev = mq->dev;
652 kfree(mq->sendbuf);
653 mutex_unlock(&mq->mutex);
654 list_del_init(&mq->list);
655
656 switch (code) {
657 case MAPLE_RESPONSE_NONE:
658 maple_response_none(dev, mq);
659 break;
660
661 case MAPLE_RESPONSE_DEVINFO:
662 maple_response_devinfo(dev, recvbuf);
663 break;
664
665 case MAPLE_RESPONSE_DATATRF:
666 if (dev->callback)
667 dev->callback(mq);
668 break;
669
670 case MAPLE_RESPONSE_FILEERR:
671 case MAPLE_RESPONSE_AGAIN:
672 case MAPLE_RESPONSE_BADCMD:
673 case MAPLE_RESPONSE_BADFUNC:
674 printk(KERN_DEBUG
675 "Maple non-fatal error 0x%X\n",
676 code);
677 break;
678
679 case MAPLE_RESPONSE_ALLINFO:
680 printk(KERN_DEBUG
681 "Maple - extended device information"
682 " not supported\n");
683 break;
684
685 case MAPLE_RESPONSE_OK:
686 break;
687
688 default:
689 break;
690 }
691 }
692 /* if scanning is 1 then we have subdevices to check */
693 if (scanning == 1) {
694 maple_send();
695 scanning = 2;
696 } else
697 scanning = 0;
698 /*check if we have actually tested all ports yet */
699 if (!fullscan)
700 maple_port_rescan();
701 /* mark that we have been through the first scan */
702 if (started == 0)
703 started = 1;
704 }
705 maplebus_dma_reset();
706 }
707
708 static irqreturn_t maplebus_dma_interrupt(int irq, void *dev_id)
709 {
710 /* Load everything into the bottom half */
711 schedule_work(&maple_dma_process);
712 return IRQ_HANDLED;
713 }
714
715 static irqreturn_t maplebus_vblank_interrupt(int irq, void *dev_id)
716 {
717 schedule_work(&maple_vblank_process);
718 return IRQ_HANDLED;
719 }
720
721 static int maple_set_dma_interrupt_handler(void)
722 {
723 return request_irq(HW_EVENT_MAPLE_DMA, maplebus_dma_interrupt,
724 IRQF_SHARED, "maple bus DMA", &maple_dummy_driver);
725 }
726
727 static int maple_set_vblank_interrupt_handler(void)
728 {
729 return request_irq(HW_EVENT_VSYNC, maplebus_vblank_interrupt,
730 IRQF_SHARED, "maple bus VBLANK", &maple_dummy_driver);
731 }
732
733 static int maple_get_dma_buffer(void)
734 {
735 maple_sendbuf =
736 (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
737 MAPLE_DMA_PAGES);
738 if (!maple_sendbuf)
739 return -ENOMEM;
740 return 0;
741 }
742
743 static int match_maple_bus_driver(struct device *devptr,
744 struct device_driver *drvptr)
745 {
746 struct maple_driver *maple_drv = to_maple_driver(drvptr);
747 struct maple_device *maple_dev = to_maple_dev(devptr);
748
749 /* Trap empty port case */
750 if (maple_dev->devinfo.function == 0xFFFFFFFF)
751 return 0;
752 else if (maple_dev->devinfo.function &
753 cpu_to_be32(maple_drv->function))
754 return 1;
755 return 0;
756 }
757
758 static int maple_bus_uevent(struct device *dev,
759 struct kobj_uevent_env *env)
760 {
761 return 0;
762 }
763
764 static void maple_bus_release(struct device *dev)
765 {
766 }
767
768 static struct maple_driver maple_dummy_driver = {
769 .drv = {
770 .name = "maple_dummy_driver",
771 .bus = &maple_bus_type,
772 },
773 };
774
775 struct bus_type maple_bus_type = {
776 .name = "maple",
777 .match = match_maple_bus_driver,
778 .uevent = maple_bus_uevent,
779 };
780 EXPORT_SYMBOL_GPL(maple_bus_type);
781
782 static struct device maple_bus = {
783 .bus_id = "maple",
784 .release = maple_bus_release,
785 };
786
787 static int __init maple_bus_init(void)
788 {
789 int retval, i;
790 struct maple_device *mdev[MAPLE_PORTS];
791 ctrl_outl(0, MAPLE_STATE);
792
793 retval = device_register(&maple_bus);
794 if (retval)
795 goto cleanup;
796
797 retval = bus_register(&maple_bus_type);
798 if (retval)
799 goto cleanup_device;
800
801 retval = driver_register(&maple_dummy_driver.drv);
802 if (retval)
803 goto cleanup_bus;
804
805 /* allocate memory for maple bus dma */
806 retval = maple_get_dma_buffer();
807 if (retval) {
808 printk(KERN_INFO
809 "Maple bus: Failed to allocate Maple DMA buffers\n");
810 goto cleanup_basic;
811 }
812
813 /* set up DMA interrupt handler */
814 retval = maple_set_dma_interrupt_handler();
815 if (retval) {
816 printk(KERN_INFO
817 "Maple bus: Failed to grab maple DMA IRQ\n");
818 goto cleanup_dma;
819 }
820
821 /* set up VBLANK interrupt handler */
822 retval = maple_set_vblank_interrupt_handler();
823 if (retval) {
824 printk(KERN_INFO "Maple bus: Failed to grab VBLANK IRQ\n");
825 goto cleanup_irq;
826 }
827
828 maple_queue_cache =
829 kmem_cache_create("maple_queue_cache", 0x400, 0,
830 SLAB_POISON|SLAB_HWCACHE_ALIGN, NULL);
831
832 if (!maple_queue_cache)
833 goto cleanup_bothirqs;
834
835 INIT_LIST_HEAD(&maple_waitq);
836 INIT_LIST_HEAD(&maple_sentq);
837
838 /* setup maple ports */
839 for (i = 0; i < MAPLE_PORTS; i++) {
840 checked[i] = false;
841 mdev[i] = maple_alloc_dev(i, 0);
842 baseunits[i] = mdev[i];
843 if (!mdev[i]) {
844 while (i-- > 0)
845 maple_free_dev(mdev[i]);
846 goto cleanup_cache;
847 }
848 maple_add_packet(mdev[i], 0, MAPLE_COMMAND_DEVINFO, 0, NULL);
849 subdevice_map[i] = 0;
850 }
851
852 /* setup maplebus hardware */
853 maplebus_dma_reset();
854 /* initial detection */
855 maple_send();
856 maple_pnp_time = jiffies;
857 printk(KERN_INFO "Maple bus core now registered.\n");
858
859 return 0;
860
861 cleanup_cache:
862 kmem_cache_destroy(maple_queue_cache);
863
864 cleanup_bothirqs:
865 free_irq(HW_EVENT_VSYNC, 0);
866
867 cleanup_irq:
868 free_irq(HW_EVENT_MAPLE_DMA, 0);
869
870 cleanup_dma:
871 free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES);
872
873 cleanup_basic:
874 driver_unregister(&maple_dummy_driver.drv);
875
876 cleanup_bus:
877 bus_unregister(&maple_bus_type);
878
879 cleanup_device:
880 device_unregister(&maple_bus);
881
882 cleanup:
883 printk(KERN_INFO "Maple bus registration failed\n");
884 return retval;
885 }
886 /* Push init to later to ensure hardware gets detected */
887 fs_initcall(maple_bus_init);
x86 "subsystem" repository