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1 /*
2  * Driver for Digigram miXart soundcards
3  *
4  * low level interface with interrupt handling and mail box implementation
5  *
6  * Copyright (c) 2003 by Digigram <alsa@digigram.com>
7  *
8  *   This program is free software; you can redistribute it and/or modify
9  *   it under the terms of the GNU General Public License as published by
10  *   the Free Software Foundation; either version 2 of the License, or
11  *   (at your option) any later version.
12  *
13  *   This program is distributed in the hope that it will be useful,
14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *   GNU General Public License for more details.
17  *
18  *   You should have received a copy of the GNU General Public License
19  *   along with this program; if not, write to the Free Software
20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
21  */
22 
23 #include <linux/interrupt.h>
24 #include <linux/mutex.h>
25 #include <linux/pci.h>
26 #include <linux/io.h>
27 
28 #include <sound/core.h>
29 #include "mixart.h"
30 #include "mixart_hwdep.h"
31 #include "mixart_core.h"
32 
33 
34 #define MSG_TIMEOUT_JIFFIES         (400 * HZ) / 1000 /* 400 ms */
35 
36 #define MSG_DESCRIPTOR_SIZE         0x24
37 #define MSG_HEADER_SIZE             (MSG_DESCRIPTOR_SIZE + 4)
38 
39 #define MSG_DEFAULT_SIZE            512
40 
41 #define MSG_TYPE_MASK               0x00000003    /* mask for following types */
42 #define MSG_TYPE_NOTIFY             0             /* embedded -> driver (only notification, do not get_msg() !) */
43 #define MSG_TYPE_COMMAND            1             /* driver <-> embedded (a command has no answer) */
44 #define MSG_TYPE_REQUEST            2             /* driver -> embedded (request will get an answer back) */
45 #define MSG_TYPE_ANSWER             3             /* embedded -> driver */
46 #define MSG_CANCEL_NOTIFY_MASK      0x80000000    /* this bit is set for a notification that has been canceled */
47 
48 
retrieve_msg_frame(struct mixart_mgr * mgr,u32 * msg_frame)49 static int retrieve_msg_frame(struct mixart_mgr *mgr, u32 *msg_frame)
50 {
51 	/* read the message frame fifo */
52 	u32 headptr, tailptr;
53 
54 	tailptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
55 	headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_HEAD));
56 
57 	if (tailptr == headptr)
58 		return 0; /* no message posted */
59 
60 	if (tailptr < MSG_OUTBOUND_POST_STACK)
61 		return 0; /* error */
62 	if (tailptr >= MSG_OUTBOUND_POST_STACK + MSG_BOUND_STACK_SIZE)
63 		return 0; /* error */
64 
65 	*msg_frame = readl_be(MIXART_MEM(mgr, tailptr));
66 
67 	/* increment the tail index */
68 	tailptr += 4;
69 	if( tailptr >= (MSG_OUTBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
70 		tailptr = MSG_OUTBOUND_POST_STACK;
71 	writel_be(tailptr, MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
72 
73 	return 1;
74 }
75 
get_msg(struct mixart_mgr * mgr,struct mixart_msg * resp,u32 msg_frame_address)76 static int get_msg(struct mixart_mgr *mgr, struct mixart_msg *resp,
77 		   u32 msg_frame_address )
78 {
79 	u32  headptr;
80 	u32  size;
81 	int  err;
82 #ifndef __BIG_ENDIAN
83 	unsigned int i;
84 #endif
85 
86 	err = 0;
87 
88 	/* copy message descriptor from miXart to driver */
89 	size                =  readl_be(MIXART_MEM(mgr, msg_frame_address));       /* size of descriptor + response */
90 	resp->message_id    =  readl_be(MIXART_MEM(mgr, msg_frame_address + 4));   /* dwMessageID */
91 	resp->uid.object_id =  readl_be(MIXART_MEM(mgr, msg_frame_address + 8));   /* uidDest */
92 	resp->uid.desc      =  readl_be(MIXART_MEM(mgr, msg_frame_address + 12));  /* */
93 
94 	if( (size < MSG_DESCRIPTOR_SIZE) || (resp->size < (size - MSG_DESCRIPTOR_SIZE))) {
95 		err = -EINVAL;
96 		dev_err(&mgr->pci->dev,
97 			"problem with response size = %d\n", size);
98 		goto _clean_exit;
99 	}
100 	size -= MSG_DESCRIPTOR_SIZE;
101 
102 	memcpy_fromio(resp->data, MIXART_MEM(mgr, msg_frame_address + MSG_HEADER_SIZE ), size);
103 	resp->size = size;
104 
105 	/* swap if necessary */
106 #ifndef __BIG_ENDIAN
107 	size /= 4; /* u32 size */
108 	for(i=0; i < size; i++) {
109 		((u32*)resp->data)[i] = be32_to_cpu(((u32*)resp->data)[i]);
110 	}
111 #endif
112 
113 	/*
114 	 * free message frame address
115 	 */
116 	headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
117 
118 	if( (headptr < MSG_OUTBOUND_FREE_STACK) || ( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
119 		err = -EINVAL;
120 		goto _clean_exit;
121 	}
122 
123 	/* give address back to outbound fifo */
124 	writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
125 
126 	/* increment the outbound free head */
127 	headptr += 4;
128 	if( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
129 		headptr = MSG_OUTBOUND_FREE_STACK;
130 
131 	writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
132 
133  _clean_exit:
134 	return err;
135 }
136 
137 
138 /*
139  * send a message to miXart. return: the msg_frame used for this message
140  */
141 /* call with mgr->msg_lock held! */
send_msg(struct mixart_mgr * mgr,struct mixart_msg * msg,int max_answersize,int mark_pending,u32 * msg_event)142 static int send_msg( struct mixart_mgr *mgr,
143 		     struct mixart_msg *msg,
144 		     int max_answersize,
145 		     int mark_pending,
146 		     u32 *msg_event)
147 {
148 	u32 headptr, tailptr;
149 	u32 msg_frame_address;
150 	int i;
151 
152 	if (snd_BUG_ON(msg->size % 4))
153 		return -EINVAL;
154 
155 	/* get message frame address */
156 	tailptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
157 	headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_HEAD));
158 
159 	if (tailptr == headptr) {
160 		dev_err(&mgr->pci->dev, "error: no message frame available\n");
161 		return -EBUSY;
162 	}
163 
164 	if( (tailptr < MSG_INBOUND_FREE_STACK) || (tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
165 		return -EINVAL;
166 	}
167 
168 	msg_frame_address = readl_be(MIXART_MEM(mgr, tailptr));
169 	writel(0, MIXART_MEM(mgr, tailptr)); /* set address to zero on this fifo position */
170 
171 	/* increment the inbound free tail */
172 	tailptr += 4;
173 	if( tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
174 		tailptr = MSG_INBOUND_FREE_STACK;
175 
176 	writel_be(tailptr, MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
177 
178 	/* TODO : use memcpy_toio() with intermediate buffer to copy the message */
179 
180 	/* copy message descriptor to card memory */
181 	writel_be( msg->size + MSG_DESCRIPTOR_SIZE,      MIXART_MEM(mgr, msg_frame_address) );      /* size of descriptor + request */
182 	writel_be( msg->message_id ,                     MIXART_MEM(mgr, msg_frame_address + 4) );  /* dwMessageID */
183 	writel_be( msg->uid.object_id,                   MIXART_MEM(mgr, msg_frame_address + 8) );  /* uidDest */
184 	writel_be( msg->uid.desc,                        MIXART_MEM(mgr, msg_frame_address + 12) ); /* */
185 	writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 16) ); /* SizeHeader */
186 	writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 20) ); /* OffsetDLL_T16 */
187 	writel_be( msg->size,                            MIXART_MEM(mgr, msg_frame_address + 24) ); /* SizeDLL_T16 */
188 	writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 28) ); /* OffsetDLL_DRV */
189 	writel_be( 0,                                    MIXART_MEM(mgr, msg_frame_address + 32) ); /* SizeDLL_DRV */
190 	writel_be( MSG_DESCRIPTOR_SIZE + max_answersize, MIXART_MEM(mgr, msg_frame_address + 36) ); /* dwExpectedAnswerSize */
191 
192 	/* copy message data to card memory */
193 	for( i=0; i < msg->size; i+=4 ) {
194 		writel_be( *(u32*)(msg->data + i), MIXART_MEM(mgr, MSG_HEADER_SIZE + msg_frame_address + i)  );
195 	}
196 
197 	if( mark_pending ) {
198 		if( *msg_event ) {
199 			/* the pending event is the notification we wait for ! */
200 			mgr->pending_event = *msg_event;
201 		}
202 		else {
203 			/* the pending event is the answer we wait for (same address than the request)! */
204 			mgr->pending_event = msg_frame_address;
205 
206 			/* copy address back to caller */
207 			*msg_event = msg_frame_address;
208 		}
209 	}
210 
211 	/* mark the frame as a request (will have an answer) */
212 	msg_frame_address |= MSG_TYPE_REQUEST;
213 
214 	/* post the frame */
215 	headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
216 
217 	if( (headptr < MSG_INBOUND_POST_STACK) || (headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE))) {
218 		return -EINVAL;
219 	}
220 
221 	writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
222 
223 	/* increment the inbound post head */
224 	headptr += 4;
225 	if( headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
226 		headptr = MSG_INBOUND_POST_STACK;
227 
228 	writel_be(headptr, MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
229 
230 	return 0;
231 }
232 
233 
snd_mixart_send_msg(struct mixart_mgr * mgr,struct mixart_msg * request,int max_resp_size,void * resp_data)234 int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int max_resp_size, void *resp_data)
235 {
236 	struct mixart_msg resp;
237 	u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */
238 	int err;
239 	wait_queue_t wait;
240 	long timeout;
241 
242 	init_waitqueue_entry(&wait, current);
243 
244 	mutex_lock(&mgr->msg_lock);
245 	/* send the message */
246 	err = send_msg(mgr, request, max_resp_size, 1, &msg_frame);  /* send and mark the answer pending */
247 	if (err) {
248 		mutex_unlock(&mgr->msg_lock);
249 		return err;
250 	}
251 
252 	set_current_state(TASK_UNINTERRUPTIBLE);
253 	add_wait_queue(&mgr->msg_sleep, &wait);
254 	mutex_unlock(&mgr->msg_lock);
255 	timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
256 	remove_wait_queue(&mgr->msg_sleep, &wait);
257 
258 	if (! timeout) {
259 		/* error - no ack */
260 		dev_err(&mgr->pci->dev,
261 			"error: no response on msg %x\n", msg_frame);
262 		return -EIO;
263 	}
264 
265 	/* retrieve the answer into the same struct mixart_msg */
266 	resp.message_id = 0;
267 	resp.uid = (struct mixart_uid){0,0};
268 	resp.data = resp_data;
269 	resp.size = max_resp_size;
270 
271 	mutex_lock(&mgr->msg_lock);
272 	err = get_msg(mgr, &resp, msg_frame);
273 	mutex_unlock(&mgr->msg_lock);
274 
275 	if( request->message_id != resp.message_id )
276 		dev_err(&mgr->pci->dev, "RESPONSE ERROR!\n");
277 
278 	return err;
279 }
280 
281 
snd_mixart_send_msg_wait_notif(struct mixart_mgr * mgr,struct mixart_msg * request,u32 notif_event)282 int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
283 				   struct mixart_msg *request, u32 notif_event)
284 {
285 	int err;
286 	wait_queue_t wait;
287 	long timeout;
288 
289 	if (snd_BUG_ON(!notif_event))
290 		return -EINVAL;
291 	if (snd_BUG_ON((notif_event & MSG_TYPE_MASK) != MSG_TYPE_NOTIFY))
292 		return -EINVAL;
293 	if (snd_BUG_ON(notif_event & MSG_CANCEL_NOTIFY_MASK))
294 		return -EINVAL;
295 
296 	init_waitqueue_entry(&wait, current);
297 
298 	mutex_lock(&mgr->msg_lock);
299 	/* send the message */
300 	err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event);  /* send and mark the notification event pending */
301 	if(err) {
302 		mutex_unlock(&mgr->msg_lock);
303 		return err;
304 	}
305 
306 	set_current_state(TASK_UNINTERRUPTIBLE);
307 	add_wait_queue(&mgr->msg_sleep, &wait);
308 	mutex_unlock(&mgr->msg_lock);
309 	timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
310 	remove_wait_queue(&mgr->msg_sleep, &wait);
311 
312 	if (! timeout) {
313 		/* error - no ack */
314 		dev_err(&mgr->pci->dev,
315 			"error: notification %x not received\n", notif_event);
316 		return -EIO;
317 	}
318 
319 	return 0;
320 }
321 
322 
snd_mixart_send_msg_nonblock(struct mixart_mgr * mgr,struct mixart_msg * request)323 int snd_mixart_send_msg_nonblock(struct mixart_mgr *mgr, struct mixart_msg *request)
324 {
325 	u32 message_frame;
326 	int err;
327 
328 	/* just send the message (do not mark it as a pending one) */
329 	mutex_lock(&mgr->msg_lock);
330 	err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);
331 	mutex_unlock(&mgr->msg_lock);
332 
333 	/* the answer will be handled by snd_struct mixart_msgasklet()  */
334 	atomic_inc(&mgr->msg_processed);
335 
336 	return err;
337 }
338 
339 
340 /* common buffer of interrupt to send/receive messages */
341 static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
342 
343 
snd_mixart_process_msg(struct mixart_mgr * mgr)344 static void snd_mixart_process_msg(struct mixart_mgr *mgr)
345 {
346 	struct mixart_msg resp;
347 	u32 msg, addr, type;
348 	int err;
349 
350 	while (mgr->msg_fifo_readptr != mgr->msg_fifo_writeptr) {
351 		msg = mgr->msg_fifo[mgr->msg_fifo_readptr];
352 		mgr->msg_fifo_readptr++;
353 		mgr->msg_fifo_readptr %= MSG_FIFO_SIZE;
354 
355 		/* process the message ... */
356 		addr = msg & ~MSG_TYPE_MASK;
357 		type = msg & MSG_TYPE_MASK;
358 
359 		switch (type) {
360 		case MSG_TYPE_ANSWER:
361 			/* answer to a message on that we did not wait for (send_msg_nonblock) */
362 			resp.message_id = 0;
363 			resp.data = mixart_msg_data;
364 			resp.size = sizeof(mixart_msg_data);
365 			err = get_msg(mgr, &resp, addr);
366 			if( err < 0 ) {
367 				dev_err(&mgr->pci->dev,
368 					"error(%d) reading mf %x\n",
369 					err, msg);
370 				break;
371 			}
372 
373 			switch(resp.message_id) {
374 			case MSG_STREAM_START_INPUT_STAGE_PACKET:
375 			case MSG_STREAM_START_OUTPUT_STAGE_PACKET:
376 			case MSG_STREAM_STOP_INPUT_STAGE_PACKET:
377 			case MSG_STREAM_STOP_OUTPUT_STAGE_PACKET:
378 				if(mixart_msg_data[0])
379 					dev_err(&mgr->pci->dev,
380 						"error MSG_STREAM_ST***_***PUT_STAGE_PACKET status=%x\n",
381 						mixart_msg_data[0]);
382 				break;
383 			default:
384 				dev_dbg(&mgr->pci->dev,
385 					"received mf(%x) : msg_id(%x) uid(%x, %x) size(%zd)\n",
386 					   msg, resp.message_id, resp.uid.object_id, resp.uid.desc, resp.size);
387 				break;
388 			}
389 			break;
390  		case MSG_TYPE_NOTIFY:
391 			/* msg contains no address ! do not get_msg() ! */
392 		case MSG_TYPE_COMMAND:
393 			/* get_msg() necessary */
394 		default:
395 			dev_err(&mgr->pci->dev,
396 				"doesn't know what to do with message %x\n",
397 				msg);
398 		} /* switch type */
399 
400 		/* decrement counter */
401 		atomic_dec(&mgr->msg_processed);
402 
403 	} /* while there is a msg in fifo */
404 }
405 
406 
snd_mixart_interrupt(int irq,void * dev_id)407 irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
408 {
409 	struct mixart_mgr *mgr = dev_id;
410 	u32 it_reg;
411 
412 	it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));
413 	if( !(it_reg & MIXART_OIDI) ) {
414 		/* this device did not cause the interrupt */
415 		return IRQ_NONE;
416 	}
417 
418 	/* mask all interrupts */
419 	writel_le(MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG(mgr, MIXART_PCI_OMIMR_OFFSET));
420 
421 	/* outdoorbell register clear */
422 	it_reg = readl(MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
423 	writel(it_reg, MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
424 
425 	/* clear interrupt */
426 	writel_le( MIXART_OIDI, MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET) );
427 
428 	return IRQ_WAKE_THREAD;
429 }
430 
snd_mixart_threaded_irq(int irq,void * dev_id)431 irqreturn_t snd_mixart_threaded_irq(int irq, void *dev_id)
432 {
433 	struct mixart_mgr *mgr = dev_id;
434 	int err;
435 	struct mixart_msg resp;
436 	u32 msg;
437 
438 	mutex_lock(&mgr->lock);
439 	/* process interrupt */
440 	while (retrieve_msg_frame(mgr, &msg)) {
441 
442 		switch (msg & MSG_TYPE_MASK) {
443 		case MSG_TYPE_COMMAND:
444 			resp.message_id = 0;
445 			resp.data = mixart_msg_data;
446 			resp.size = sizeof(mixart_msg_data);
447 			err = get_msg(mgr, &resp, msg & ~MSG_TYPE_MASK);
448 			if( err < 0 ) {
449 				dev_err(&mgr->pci->dev,
450 					"interrupt: error(%d) reading mf %x\n",
451 					err, msg);
452 				break;
453 			}
454 
455 			if(resp.message_id == MSG_SERVICES_TIMER_NOTIFY) {
456 				int i;
457 				struct mixart_timer_notify *notify;
458 				notify = (struct mixart_timer_notify *)mixart_msg_data;
459 
460 				for(i=0; i<notify->stream_count; i++) {
461 
462 					u32 buffer_id = notify->streams[i].buffer_id;
463 					unsigned int chip_number =  (buffer_id & MIXART_NOTIFY_CARD_MASK) >> MIXART_NOTIFY_CARD_OFFSET; /* card0 to 3 */
464 					unsigned int pcm_number  =  (buffer_id & MIXART_NOTIFY_PCM_MASK ) >> MIXART_NOTIFY_PCM_OFFSET;  /* pcm0 to 3  */
465 					unsigned int sub_number  =   buffer_id & MIXART_NOTIFY_SUBS_MASK;             /* 0 to MIXART_PLAYBACK_STREAMS */
466 					unsigned int is_capture  = ((buffer_id & MIXART_NOTIFY_CAPT_MASK) != 0);      /* playback == 0 / capture == 1 */
467 
468 					struct snd_mixart *chip  = mgr->chip[chip_number];
469 					struct mixart_stream *stream;
470 
471 					if ((chip_number >= mgr->num_cards) || (pcm_number >= MIXART_PCM_TOTAL) || (sub_number >= MIXART_PLAYBACK_STREAMS)) {
472 						dev_err(&mgr->pci->dev,
473 							"error MSG_SERVICES_TIMER_NOTIFY buffer_id (%x) pos(%d)\n",
474 							   buffer_id, notify->streams[i].sample_pos_low_part);
475 						break;
476 					}
477 
478 					if (is_capture)
479 						stream = &chip->capture_stream[pcm_number];
480 					else
481 						stream = &chip->playback_stream[pcm_number][sub_number];
482 
483 					if (stream->substream && (stream->status == MIXART_STREAM_STATUS_RUNNING)) {
484 						struct snd_pcm_runtime *runtime = stream->substream->runtime;
485 						int elapsed = 0;
486 						u64 sample_count = ((u64)notify->streams[i].sample_pos_high_part) << 32;
487 						sample_count |= notify->streams[i].sample_pos_low_part;
488 
489 						while (1) {
490 							u64 new_elapse_pos = stream->abs_period_elapsed +  runtime->period_size;
491 
492 							if (new_elapse_pos > sample_count) {
493 								break; /* while */
494 							}
495 							else {
496 								elapsed = 1;
497 								stream->buf_periods++;
498 								if (stream->buf_periods >= runtime->periods)
499 									stream->buf_periods = 0;
500 
501 								stream->abs_period_elapsed = new_elapse_pos;
502 							}
503 						}
504 						stream->buf_period_frag = (u32)( sample_count - stream->abs_period_elapsed );
505 
506 						if(elapsed) {
507 							mutex_unlock(&mgr->lock);
508 							snd_pcm_period_elapsed(stream->substream);
509 							mutex_lock(&mgr->lock);
510 						}
511 					}
512 				}
513 				break;
514 			}
515 			if(resp.message_id == MSG_SERVICES_REPORT_TRACES) {
516 				if(resp.size > 1) {
517 #ifndef __BIG_ENDIAN
518 					/* Traces are text: the swapped msg_data has to be swapped back ! */
519 					int i;
520 					for(i=0; i<(resp.size/4); i++) {
521 						(mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);
522 					}
523 #endif
524 					((char*)mixart_msg_data)[resp.size - 1] = 0;
525 					dev_dbg(&mgr->pci->dev,
526 						"MIXART TRACE : %s\n",
527 						(char *)mixart_msg_data);
528 				}
529 				break;
530 			}
531 
532 			dev_dbg(&mgr->pci->dev, "command %x not handled\n",
533 				resp.message_id);
534 			break;
535 
536 		case MSG_TYPE_NOTIFY:
537 			if(msg & MSG_CANCEL_NOTIFY_MASK) {
538 				msg &= ~MSG_CANCEL_NOTIFY_MASK;
539 				dev_err(&mgr->pci->dev,
540 					"canceled notification %x !\n", msg);
541 			}
542 			/* no break, continue ! */
543 		case MSG_TYPE_ANSWER:
544 			/* answer or notification to a message we are waiting for*/
545 			mutex_lock(&mgr->msg_lock);
546 			if( (msg & ~MSG_TYPE_MASK) == mgr->pending_event ) {
547 				wake_up(&mgr->msg_sleep);
548 				mgr->pending_event = 0;
549 			}
550 			/* answer to a message we did't want to wait for */
551 			else {
552 				mgr->msg_fifo[mgr->msg_fifo_writeptr] = msg;
553 				mgr->msg_fifo_writeptr++;
554 				mgr->msg_fifo_writeptr %= MSG_FIFO_SIZE;
555 				snd_mixart_process_msg(mgr);
556 			}
557 			mutex_unlock(&mgr->msg_lock);
558 			break;
559 		case MSG_TYPE_REQUEST:
560 		default:
561 			dev_dbg(&mgr->pci->dev,
562 				"interrupt received request %x\n", msg);
563 			/* TODO : are there things to do here ? */
564 			break;
565 		} /* switch on msg type */
566 	} /* while there are msgs */
567 
568 	/* allow interrupt again */
569 	writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
570 
571 	mutex_unlock(&mgr->lock);
572 
573 	return IRQ_HANDLED;
574 }
575 
576 
snd_mixart_init_mailbox(struct mixart_mgr * mgr)577 void snd_mixart_init_mailbox(struct mixart_mgr *mgr)
578 {
579 	writel( 0, MIXART_MEM( mgr, MSG_HOST_RSC_PROTECTION ) );
580 	writel( 0, MIXART_MEM( mgr, MSG_AGENT_RSC_PROTECTION ) );
581 
582 	/* allow outbound messagebox to generate interrupts */
583 	if(mgr->irq >= 0) {
584 		writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
585 	}
586 	return;
587 }
588 
snd_mixart_exit_mailbox(struct mixart_mgr * mgr)589 void snd_mixart_exit_mailbox(struct mixart_mgr *mgr)
590 {
591 	/* no more interrupts on outbound messagebox */
592 	writel_le( MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
593 	return;
594 }
595 
snd_mixart_reset_board(struct mixart_mgr * mgr)596 void snd_mixart_reset_board(struct mixart_mgr *mgr)
597 {
598 	/* reset miXart */
599 	writel_be( 1, MIXART_REG(mgr, MIXART_BA1_BRUTAL_RESET_OFFSET) );
600 	return;
601 }
602