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