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x86: cpa self-test, WARN_ON()
[wrt350n-kernel.git] / drivers / sh / maple / maple.c
blobe52a6296ca46eedd20b2cd99469b65704135f842
1 /*
2 * Core maple bus functionality
3 *
4 * Copyright (C) 2007 Adrian McMenamin
5 *
6 * Based on 2.4 code by:
7 *
8 * Copyright (C) 2000-2001 YAEGASHI Takeshi
9 * Copyright (C) 2001 M. R. Brown
10 * Copyright (C) 2001 Paul Mundt
11 *
12 * and others.
13 *
14 * This file is subject to the terms and conditions of the GNU General Public
15 * License. See the file "COPYING" in the main directory of this archive
16 * for more details.
17 */
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <linux/device.h>
21 #include <linux/module.h>
22 #include <linux/interrupt.h>
23 #include <linux/list.h>
24 #include <linux/io.h>
25 #include <linux/slab.h>
26 #include <linux/maple.h>
27 #include <linux/dma-mapping.h>
28 #include <asm/cacheflush.h>
29 #include <asm/dma.h>
30 #include <asm/io.h>
31 #include <asm/mach/dma.h>
32 #include <asm/mach/sysasic.h>
33 #include <asm/mach/maple.h>
34
35 MODULE_AUTHOR("Yaegshi Takeshi, Paul Mundt, M.R. Brown, Adrian McMenamin");
36 MODULE_DESCRIPTION("Maple bus driver for Dreamcast");
37 MODULE_LICENSE("GPL v2");
38 MODULE_SUPPORTED_DEVICE("{{SEGA, Dreamcast/Maple}}");
39
40 static void maple_dma_handler(struct work_struct *work);
41 static void maple_vblank_handler(struct work_struct *work);
42
43 static DECLARE_WORK(maple_dma_process, maple_dma_handler);
44 static DECLARE_WORK(maple_vblank_process, maple_vblank_handler);
45
46 static LIST_HEAD(maple_waitq);
47 static LIST_HEAD(maple_sentq);
48
49 static DEFINE_MUTEX(maple_list_lock);
50
51 static struct maple_driver maple_dummy_driver;
52 static struct device maple_bus;
53 static int subdevice_map[MAPLE_PORTS];
54 static unsigned long *maple_sendbuf, *maple_sendptr, *maple_lastptr;
55 static unsigned long maple_pnp_time;
56 static int started, scanning, liststatus;
57 static struct kmem_cache *maple_queue_cache;
58
59 struct maple_device_specify {
60 int port;
61 int unit;
62 };
63
64 /**
65 * maple_driver_register - register a device driver
66 * automatically makes the driver bus a maple bus
67 * @drv: the driver to be registered
68 */
69 int maple_driver_register(struct device_driver *drv)
70 {
71 if (!drv)
72 return -EINVAL;
73 drv->bus = &maple_bus_type;
74 return driver_register(drv);
75 }
76 EXPORT_SYMBOL_GPL(maple_driver_register);
77
78 /* set hardware registers to enable next round of dma */
79 static void maplebus_dma_reset(void)
80 {
81 ctrl_outl(MAPLE_MAGIC, MAPLE_RESET);
82 /* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */
83 ctrl_outl(1, MAPLE_TRIGTYPE);
84 ctrl_outl(MAPLE_2MBPS | MAPLE_TIMEOUT(50000), MAPLE_SPEED);
85 ctrl_outl(PHYSADDR(maple_sendbuf), MAPLE_DMAADDR);
86 ctrl_outl(1, MAPLE_ENABLE);
87 }
88
89 /**
90 * maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND
91 * @dev: device responding
92 * @callback: handler callback
93 * @interval: interval in jiffies between callbacks
94 * @function: the function code for the device
95 */
96 void maple_getcond_callback(struct maple_device *dev,
97 void (*callback) (struct mapleq * mq),
98 unsigned long interval, unsigned long function)
99 {
100 dev->callback = callback;
101 dev->interval = interval;
102 dev->function = cpu_to_be32(function);
103 dev->when = jiffies;
104 }
105 EXPORT_SYMBOL_GPL(maple_getcond_callback);
106
107 static int maple_dma_done(void)
108 {
109 return (ctrl_inl(MAPLE_STATE) & 1) == 0;
110 }
111
112 static void maple_release_device(struct device *dev)
113 {
114 if (dev->type) {
115 kfree(dev->type->name);
116 kfree(dev->type);
117 }
118 }
119
120 /**
121 * maple_add_packet - add a single instruction to the queue
122 * @mq: instruction to add to waiting queue
123 */
124 void maple_add_packet(struct mapleq *mq)
125 {
126 mutex_lock(&maple_list_lock);
127 list_add(&mq->list, &maple_waitq);
128 mutex_unlock(&maple_list_lock);
129 }
130 EXPORT_SYMBOL_GPL(maple_add_packet);
131
132 static struct mapleq *maple_allocq(struct maple_device *dev)
133 {
134 struct mapleq *mq;
135
136 mq = kmalloc(sizeof(*mq), GFP_KERNEL);
137 if (!mq)
138 return NULL;
139
140 mq->dev = dev;
141 mq->recvbufdcsp = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
142 mq->recvbuf = (void *) P2SEGADDR(mq->recvbufdcsp);
143 if (!mq->recvbuf) {
144 kfree(mq);
145 return NULL;
146 }
147
148 return mq;
149 }
150
151 static struct maple_device *maple_alloc_dev(int port, int unit)
152 {
153 struct maple_device *dev;
154
155 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
156 if (!dev)
157 return NULL;
158
159 dev->port = port;
160 dev->unit = unit;
161 dev->mq = maple_allocq(dev);
162
163 if (!dev->mq) {
164 kfree(dev);
165 return NULL;
166 }
167
168 return dev;
169 }
170
171 static void maple_free_dev(struct maple_device *mdev)
172 {
173 if (!mdev)
174 return;
175 if (mdev->mq) {
176 kmem_cache_free(maple_queue_cache, mdev->mq->recvbufdcsp);
177 kfree(mdev->mq);
178 }
179 kfree(mdev);
180 }
181
182 /* process the command queue into a maple command block
183 * terminating command has bit 32 of first long set to 0
184 */
185 static void maple_build_block(struct mapleq *mq)
186 {
187 int port, unit, from, to, len;
188 unsigned long *lsendbuf = mq->sendbuf;
189
190 port = mq->dev->port & 3;
191 unit = mq->dev->unit;
192 len = mq->length;
193 from = port << 6;
194 to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20);
195
196 *maple_lastptr &= 0x7fffffff;
197 maple_lastptr = maple_sendptr;
198
199 *maple_sendptr++ = (port << 16) | len | 0x80000000;
200 *maple_sendptr++ = PHYSADDR(mq->recvbuf);
201 *maple_sendptr++ =
202 mq->command | (to << 8) | (from << 16) | (len << 24);
203
204 while (len-- > 0)
205 *maple_sendptr++ = *lsendbuf++;
206 }
207
208 /* build up command queue */
209 static void maple_send(void)
210 {
211 int i;
212 int maple_packets;
213 struct mapleq *mq, *nmq;
214
215 if (!list_empty(&maple_sentq))
216 return;
217 if (list_empty(&maple_waitq) || !maple_dma_done())
218 return;
219 maple_packets = 0;
220 maple_sendptr = maple_lastptr = maple_sendbuf;
221 list_for_each_entry_safe(mq, nmq, &maple_waitq, list) {
222 maple_build_block(mq);
223 list_move(&mq->list, &maple_sentq);
224 if (maple_packets++ > MAPLE_MAXPACKETS)
225 break;
226 }
227 if (maple_packets > 0) {
228 for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++)
229 dma_cache_sync(0, maple_sendbuf + i * PAGE_SIZE,
230 PAGE_SIZE, DMA_BIDIRECTIONAL);
231 }
232 }
233
234 static int attach_matching_maple_driver(struct device_driver *driver,
235 void *devptr)
236 {
237 struct maple_driver *maple_drv;
238 struct maple_device *mdev;
239
240 mdev = devptr;
241 maple_drv = to_maple_driver(driver);
242 if (mdev->devinfo.function & be32_to_cpu(maple_drv->function)) {
243 if (maple_drv->connect(mdev) == 0) {
244 mdev->driver = maple_drv;
245 return 1;
246 }
247 }
248 return 0;
249 }
250
251 static void maple_detach_driver(struct maple_device *mdev)
252 {
253 if (!mdev)
254 return;
255 if (mdev->driver) {
256 if (mdev->driver->disconnect)
257 mdev->driver->disconnect(mdev);
258 }
259 mdev->driver = NULL;
260 if (mdev->registered) {
261 maple_release_device(&mdev->dev);
262 device_unregister(&mdev->dev);
263 }
264 mdev->registered = 0;
265 maple_free_dev(mdev);
266 }
267
268 /* process initial MAPLE_COMMAND_DEVINFO for each device or port */
269 static void maple_attach_driver(struct maple_device *dev)
270 {
271 char *p;
272
273 char *recvbuf;
274 unsigned long function;
275 int matched, retval;
276
277 recvbuf = dev->mq->recvbuf;
278 memcpy(&dev->devinfo, recvbuf + 4, sizeof(dev->devinfo));
279 memcpy(dev->product_name, dev->devinfo.product_name, 30);
280 memcpy(dev->product_licence, dev->devinfo.product_licence, 60);
281 dev->product_name[30] = '\0';
282 dev->product_licence[60] = '\0';
283
284 for (p = dev->product_name + 29; dev->product_name <= p; p--)
285 if (*p == ' ')
286 *p = '\0';
287 else
288 break;
289
290 for (p = dev->product_licence + 59; dev->product_licence <= p; p--)
291 if (*p == ' ')
292 *p = '\0';
293 else
294 break;
295
296 function = be32_to_cpu(dev->devinfo.function);
297
298 if (function > 0x200) {
299 /* Do this silently - as not a real device */
300 function = 0;
301 dev->driver = &maple_dummy_driver;
302 sprintf(dev->dev.bus_id, "%d:0.port", dev->port);
303 } else {
304 printk(KERN_INFO
305 "Maple bus at (%d, %d): Connected function 0x%lX\n",
306 dev->port, dev->unit, function);
307
308 matched =
309 bus_for_each_drv(&maple_bus_type, NULL, dev,
310 attach_matching_maple_driver);
311
312 if (matched == 0) {
313 /* Driver does not exist yet */
314 printk(KERN_INFO
315 "No maple driver found for this device\n");
316 dev->driver = &maple_dummy_driver;
317 }
318
319 sprintf(dev->dev.bus_id, "%d:0%d.%lX", dev->port,
320 dev->unit, function);
321 }
322 dev->function = function;
323 dev->dev.bus = &maple_bus_type;
324 dev->dev.parent = &maple_bus;
325 dev->dev.release = &maple_release_device;
326 retval = device_register(&dev->dev);
327 if (retval) {
328 printk(KERN_INFO
329 "Maple bus: Attempt to register device (%x, %x) failed.\n",
330 dev->port, dev->unit);
331 maple_free_dev(dev);
332 }
333 dev->registered = 1;
334 }
335
336 /*
337 * if device has been registered for the given
338 * port and unit then return 1 - allows identification
339 * of which devices need to be attached or detached
340 */
341 static int detach_maple_device(struct device *device, void *portptr)
342 {
343 struct maple_device_specify *ds;
344 struct maple_device *mdev;
345
346 ds = portptr;
347 mdev = to_maple_dev(device);
348 if (mdev->port == ds->port && mdev->unit == ds->unit)
349 return 1;
350 return 0;
351 }
352
353 static int setup_maple_commands(struct device *device, void *ignored)
354 {
355 struct maple_device *maple_dev = to_maple_dev(device);
356
357 if ((maple_dev->interval > 0)
358 && time_after(jiffies, maple_dev->when)) {
359 maple_dev->when = jiffies + maple_dev->interval;
360 maple_dev->mq->command = MAPLE_COMMAND_GETCOND;
361 maple_dev->mq->sendbuf = &maple_dev->function;
362 maple_dev->mq->length = 1;
363 maple_add_packet(maple_dev->mq);
364 liststatus++;
365 } else {
366 if (time_after(jiffies, maple_pnp_time)) {
367 maple_dev->mq->command = MAPLE_COMMAND_DEVINFO;
368 maple_dev->mq->length = 0;
369 maple_add_packet(maple_dev->mq);
370 liststatus++;
371 }
372 }
373
374 return 0;
375 }
376
377 /* VBLANK bottom half - implemented via workqueue */
378 static void maple_vblank_handler(struct work_struct *work)
379 {
380 if (!maple_dma_done())
381 return;
382 if (!list_empty(&maple_sentq))
383 return;
384 ctrl_outl(0, MAPLE_ENABLE);
385 liststatus = 0;
386 bus_for_each_dev(&maple_bus_type, NULL, NULL,
387 setup_maple_commands);
388 if (time_after(jiffies, maple_pnp_time))
389 maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL;
390 if (liststatus && list_empty(&maple_sentq)) {
391 INIT_LIST_HEAD(&maple_sentq);
392 maple_send();
393 }
394 maplebus_dma_reset();
395 }
396
397 /* handle devices added via hotplugs - placing them on queue for DEVINFO*/
398 static void maple_map_subunits(struct maple_device *mdev, int submask)
399 {
400 int retval, k, devcheck;
401 struct maple_device *mdev_add;
402 struct maple_device_specify ds;
403
404 for (k = 0; k < 5; k++) {
405 ds.port = mdev->port;
406 ds.unit = k + 1;
407 retval =
408 bus_for_each_dev(&maple_bus_type, NULL, &ds,
409 detach_maple_device);
410 if (retval) {
411 submask = submask >> 1;
412 continue;
413 }
414 devcheck = submask & 0x01;
415 if (devcheck) {
416 mdev_add = maple_alloc_dev(mdev->port, k + 1);
417 if (!mdev_add)
418 return;
419 mdev_add->mq->command = MAPLE_COMMAND_DEVINFO;
420 mdev_add->mq->length = 0;
421 maple_add_packet(mdev_add->mq);
422 scanning = 1;
423 }
424 submask = submask >> 1;
425 }
426 }
427
428 /* mark a device as removed */
429 static void maple_clean_submap(struct maple_device *mdev)
430 {
431 int killbit;
432
433 killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20);
434 killbit = ~killbit;
435 killbit &= 0xFF;
436 subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit;
437 }
438
439 /* handle empty port or hotplug removal */
440 static void maple_response_none(struct maple_device *mdev,
441 struct mapleq *mq)
442 {
443 if (mdev->unit != 0) {
444 list_del(&mq->list);
445 maple_clean_submap(mdev);
446 printk(KERN_INFO
447 "Maple bus device detaching at (%d, %d)\n",
448 mdev->port, mdev->unit);
449 maple_detach_driver(mdev);
450 return;
451 }
452 if (!started) {
453 printk(KERN_INFO "No maple devices attached to port %d\n",
454 mdev->port);
455 return;
456 }
457 maple_clean_submap(mdev);
458 }
459
460 /* preprocess hotplugs or scans */
461 static void maple_response_devinfo(struct maple_device *mdev,
462 char *recvbuf)
463 {
464 char submask;
465 if ((!started) || (scanning == 2)) {
466 maple_attach_driver(mdev);
467 return;
468 }
469 if (mdev->unit == 0) {
470 submask = recvbuf[2] & 0x1F;
471 if (submask ^ subdevice_map[mdev->port]) {
472 maple_map_subunits(mdev, submask);
473 subdevice_map[mdev->port] = submask;
474 }
475 }
476 }
477
478 /* maple dma end bottom half - implemented via workqueue */
479 static void maple_dma_handler(struct work_struct *work)
480 {
481 struct mapleq *mq, *nmq;
482 struct maple_device *dev;
483 char *recvbuf;
484 enum maple_code code;
485
486 if (!maple_dma_done())
487 return;
488 ctrl_outl(0, MAPLE_ENABLE);
489 if (!list_empty(&maple_sentq)) {
490 list_for_each_entry_safe(mq, nmq, &maple_sentq, list) {
491 recvbuf = mq->recvbuf;
492 code = recvbuf[0];
493 dev = mq->dev;
494 switch (code) {
495 case MAPLE_RESPONSE_NONE:
496 maple_response_none(dev, mq);
497 break;
498
499 case MAPLE_RESPONSE_DEVINFO:
500 maple_response_devinfo(dev, recvbuf);
501 break;
502
503 case MAPLE_RESPONSE_DATATRF:
504 if (dev->callback)
505 dev->callback(mq);
506 break;
507
508 case MAPLE_RESPONSE_FILEERR:
509 case MAPLE_RESPONSE_AGAIN:
510 case MAPLE_RESPONSE_BADCMD:
511 case MAPLE_RESPONSE_BADFUNC:
512 printk(KERN_DEBUG
513 "Maple non-fatal error 0x%X\n",
514 code);
515 break;
516
517 case MAPLE_RESPONSE_ALLINFO:
518 printk(KERN_DEBUG
519 "Maple - extended device information not supported\n");
520 break;
521
522 case MAPLE_RESPONSE_OK:
523 break;
524
525 default:
526 break;
527 }
528 }
529 INIT_LIST_HEAD(&maple_sentq);
530 if (scanning == 1) {
531 maple_send();
532 scanning = 2;
533 } else
534 scanning = 0;
535
536 if (started == 0)
537 started = 1;
538 }
539 maplebus_dma_reset();
540 }
541
542 static irqreturn_t maplebus_dma_interrupt(int irq, void *dev_id)
543 {
544 /* Load everything into the bottom half */
545 schedule_work(&maple_dma_process);
546 return IRQ_HANDLED;
547 }
548
549 static irqreturn_t maplebus_vblank_interrupt(int irq, void *dev_id)
550 {
551 schedule_work(&maple_vblank_process);
552 return IRQ_HANDLED;
553 }
554
555 static struct irqaction maple_dma_irq = {
556 .name = "maple bus DMA handler",
557 .handler = maplebus_dma_interrupt,
558 .flags = IRQF_SHARED,
559 };
560
561 static struct irqaction maple_vblank_irq = {
562 .name = "maple bus VBLANK handler",
563 .handler = maplebus_vblank_interrupt,
564 .flags = IRQF_SHARED,
565 };
566
567 static int maple_set_dma_interrupt_handler(void)
568 {
569 return setup_irq(HW_EVENT_MAPLE_DMA, &maple_dma_irq);
570 }
571
572 static int maple_set_vblank_interrupt_handler(void)
573 {
574 return setup_irq(HW_EVENT_VSYNC, &maple_vblank_irq);
575 }
576
577 static int maple_get_dma_buffer(void)
578 {
579 maple_sendbuf =
580 (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
581 MAPLE_DMA_PAGES);
582 if (!maple_sendbuf)
583 return -ENOMEM;
584 return 0;
585 }
586
587 static int match_maple_bus_driver(struct device *devptr,
588 struct device_driver *drvptr)
589 {
590 struct maple_driver *maple_drv;
591 struct maple_device *maple_dev;
592
593 maple_drv = container_of(drvptr, struct maple_driver, drv);
594 maple_dev = container_of(devptr, struct maple_device, dev);
595 /* Trap empty port case */
596 if (maple_dev->devinfo.function == 0xFFFFFFFF)
597 return 0;
598 else if (maple_dev->devinfo.function &
599 be32_to_cpu(maple_drv->function))
600 return 1;
601 return 0;
602 }
603
604 static int maple_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
605 {
606 return 0;
607 }
608
609 static void maple_bus_release(struct device *dev)
610 {
611 }
612
613 static struct maple_driver maple_dummy_driver = {
614 .drv = {
615 .name = "maple_dummy_driver",
616 .bus = &maple_bus_type,
617 },
618 };
619
620 struct bus_type maple_bus_type = {
621 .name = "maple",
622 .match = match_maple_bus_driver,
623 .uevent = maple_bus_uevent,
624 };
625 EXPORT_SYMBOL_GPL(maple_bus_type);
626
627 static struct device maple_bus = {
628 .bus_id = "maple",
629 .release = maple_bus_release,
630 };
631
632 static int __init maple_bus_init(void)
633 {
634 int retval, i;
635 struct maple_device *mdev[MAPLE_PORTS];
636 ctrl_outl(0, MAPLE_STATE);
637
638 retval = device_register(&maple_bus);
639 if (retval)
640 goto cleanup;
641
642 retval = bus_register(&maple_bus_type);
643 if (retval)
644 goto cleanup_device;
645
646 retval = driver_register(&maple_dummy_driver.drv);
647
648 if (retval)
649 goto cleanup_bus;
650
651 /* allocate memory for maple bus dma */
652 retval = maple_get_dma_buffer();
653 if (retval) {
654 printk(KERN_INFO
655 "Maple bus: Failed to allocate Maple DMA buffers\n");
656 goto cleanup_basic;
657 }
658
659 /* set up DMA interrupt handler */
660 retval = maple_set_dma_interrupt_handler();
661 if (retval) {
662 printk(KERN_INFO
663 "Maple bus: Failed to grab maple DMA IRQ\n");
664 goto cleanup_dma;
665 }
666
667 /* set up VBLANK interrupt handler */
668 retval = maple_set_vblank_interrupt_handler();
669 if (retval) {
670 printk(KERN_INFO "Maple bus: Failed to grab VBLANK IRQ\n");
671 goto cleanup_irq;
672 }
673
674 maple_queue_cache =
675 kmem_cache_create("maple_queue_cache", 0x400, 0,
676 SLAB_HWCACHE_ALIGN, NULL);
677
678 if (!maple_queue_cache)
679 goto cleanup_bothirqs;
680
681 /* setup maple ports */
682 for (i = 0; i < MAPLE_PORTS; i++) {
683 mdev[i] = maple_alloc_dev(i, 0);
684 if (!mdev[i]) {
685 while (i-- > 0)
686 maple_free_dev(mdev[i]);
687 goto cleanup_cache;
688 }
689 mdev[i]->registered = 0;
690 mdev[i]->mq->command = MAPLE_COMMAND_DEVINFO;
691 mdev[i]->mq->length = 0;
692 maple_attach_driver(mdev[i]);
693 maple_add_packet(mdev[i]->mq);
694 subdevice_map[i] = 0;
695 }
696
697 /* setup maplebus hardware */
698 maplebus_dma_reset();
699
700 /* initial detection */
701 maple_send();
702
703 maple_pnp_time = jiffies;
704
705 printk(KERN_INFO "Maple bus core now registered.\n");
706
707 return 0;
708
709 cleanup_cache:
710 kmem_cache_destroy(maple_queue_cache);
711
712 cleanup_bothirqs:
713 free_irq(HW_EVENT_VSYNC, 0);
714
715 cleanup_irq:
716 free_irq(HW_EVENT_MAPLE_DMA, 0);
717
718 cleanup_dma:
719 free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES);
720
721 cleanup_basic:
722 driver_unregister(&maple_dummy_driver.drv);
723
724 cleanup_bus:
725 bus_unregister(&maple_bus_type);
726
727 cleanup_device:
728 device_unregister(&maple_bus);
729
730 cleanup:
731 printk(KERN_INFO "Maple bus registration failed\n");
732 return retval;
733 }
734 subsys_initcall(maple_bus_init);
WRT350N Kernel Patches