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TOMOYO Linux Cross Reference
Linux/sound/pci/mixart/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 <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 
 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 
 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         mutex_lock(&mgr->msg_lock);
 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                 dev_err(&mgr->pci->dev,
 98                         "problem with response size = %d\n", size);
 99                 goto _clean_exit;
100         }
101         size -= MSG_DESCRIPTOR_SIZE;
102 
103         memcpy_fromio(resp->data, MIXART_MEM(mgr, msg_frame_address + MSG_HEADER_SIZE ), size);
104         resp->size = size;
105 
106         /* swap if necessary */
107 #ifndef __BIG_ENDIAN
108         size /= 4; /* u32 size */
109         for(i=0; i < size; i++) {
110                 ((u32*)resp->data)[i] = be32_to_cpu(((u32*)resp->data)[i]);
111         }
112 #endif
113 
114         /*
115          * free message frame address
116          */
117         headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
118 
119         if( (headptr < MSG_OUTBOUND_FREE_STACK) || ( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
120                 err = -EINVAL;
121                 goto _clean_exit;
122         }
123 
124         /* give address back to outbound fifo */
125         writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
126 
127         /* increment the outbound free head */
128         headptr += 4;
129         if( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
130                 headptr = MSG_OUTBOUND_FREE_STACK;
131 
132         writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
133 
134  _clean_exit:
135         mutex_unlock(&mgr->msg_lock);
136 
137         return err;
138 }
139 
140 
141 /*
142  * send a message to miXart. return: the msg_frame used for this message
143  */
144 /* call with mgr->msg_lock held! */
145 static int send_msg( struct mixart_mgr *mgr,
146                      struct mixart_msg *msg,
147                      int max_answersize,
148                      int mark_pending,
149                      u32 *msg_event)
150 {
151         u32 headptr, tailptr;
152         u32 msg_frame_address;
153         int i;
154 
155         if (snd_BUG_ON(msg->size % 4))
156                 return -EINVAL;
157 
158         /* get message frame address */
159         tailptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
160         headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_HEAD));
161 
162         if (tailptr == headptr) {
163                 dev_err(&mgr->pci->dev, "error: no message frame available\n");
164                 return -EBUSY;
165         }
166 
167         if( (tailptr < MSG_INBOUND_FREE_STACK) || (tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
168                 return -EINVAL;
169         }
170 
171         msg_frame_address = readl_be(MIXART_MEM(mgr, tailptr));
172         writel(0, MIXART_MEM(mgr, tailptr)); /* set address to zero on this fifo position */
173 
174         /* increment the inbound free tail */
175         tailptr += 4;
176         if( tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
177                 tailptr = MSG_INBOUND_FREE_STACK;
178 
179         writel_be(tailptr, MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
180 
181         /* TODO : use memcpy_toio() with intermediate buffer to copy the message */
182 
183         /* copy message descriptor to card memory */
184         writel_be( msg->size + MSG_DESCRIPTOR_SIZE,      MIXART_MEM(mgr, msg_frame_address) );      /* size of descriptor + request */
185         writel_be( msg->message_id ,                     MIXART_MEM(mgr, msg_frame_address + 4) );  /* dwMessageID */
186         writel_be( msg->uid.object_id,                   MIXART_MEM(mgr, msg_frame_address + 8) );  /* uidDest */
187         writel_be( msg->uid.desc,                        MIXART_MEM(mgr, msg_frame_address + 12) ); /* */
188         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 16) ); /* SizeHeader */
189         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 20) ); /* OffsetDLL_T16 */
190         writel_be( msg->size,                            MIXART_MEM(mgr, msg_frame_address + 24) ); /* SizeDLL_T16 */
191         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 28) ); /* OffsetDLL_DRV */
192         writel_be( 0,                                    MIXART_MEM(mgr, msg_frame_address + 32) ); /* SizeDLL_DRV */
193         writel_be( MSG_DESCRIPTOR_SIZE + max_answersize, MIXART_MEM(mgr, msg_frame_address + 36) ); /* dwExpectedAnswerSize */
194 
195         /* copy message data to card memory */
196         for( i=0; i < msg->size; i+=4 ) {
197                 writel_be( *(u32*)(msg->data + i), MIXART_MEM(mgr, MSG_HEADER_SIZE + msg_frame_address + i)  );
198         }
199 
200         if( mark_pending ) {
201                 if( *msg_event ) {
202                         /* the pending event is the notification we wait for ! */
203                         mgr->pending_event = *msg_event;
204                 }
205                 else {
206                         /* the pending event is the answer we wait for (same address than the request)! */
207                         mgr->pending_event = msg_frame_address;
208 
209                         /* copy address back to caller */
210                         *msg_event = msg_frame_address;
211                 }
212         }
213 
214         /* mark the frame as a request (will have an answer) */
215         msg_frame_address |= MSG_TYPE_REQUEST;
216 
217         /* post the frame */
218         headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
219 
220         if( (headptr < MSG_INBOUND_POST_STACK) || (headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE))) {
221                 return -EINVAL;
222         }
223 
224         writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
225 
226         /* increment the inbound post head */
227         headptr += 4;
228         if( headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
229                 headptr = MSG_INBOUND_POST_STACK;
230 
231         writel_be(headptr, MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
232 
233         return 0;
234 }
235 
236 
237 int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int max_resp_size, void *resp_data)
238 {
239         struct mixart_msg resp;
240         u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */
241         int err;
242         wait_queue_entry_t wait;
243         long timeout;
244 
245         init_waitqueue_entry(&wait, current);
246 
247         mutex_lock(&mgr->msg_lock);
248         /* send the message */
249         err = send_msg(mgr, request, max_resp_size, 1, &msg_frame);  /* send and mark the answer pending */
250         if (err) {
251                 mutex_unlock(&mgr->msg_lock);
252                 return err;
253         }
254 
255         set_current_state(TASK_UNINTERRUPTIBLE);
256         add_wait_queue(&mgr->msg_sleep, &wait);
257         mutex_unlock(&mgr->msg_lock);
258         timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
259         remove_wait_queue(&mgr->msg_sleep, &wait);
260 
261         if (! timeout) {
262                 /* error - no ack */
263                 dev_err(&mgr->pci->dev,
264                         "error: no response on msg %x\n", msg_frame);
265                 return -EIO;
266         }
267 
268         /* retrieve the answer into the same struct mixart_msg */
269         resp.message_id = 0;
270         resp.uid = (struct mixart_uid){0,0};
271         resp.data = resp_data;
272         resp.size = max_resp_size;
273 
274         err = get_msg(mgr, &resp, msg_frame);
275 
276         if( request->message_id != resp.message_id )
277                 dev_err(&mgr->pci->dev, "RESPONSE ERROR!\n");
278 
279         return err;
280 }
281 
282 
283 int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
284                                    struct mixart_msg *request, u32 notif_event)
285 {
286         int err;
287         wait_queue_entry_t wait;
288         long timeout;
289 
290         if (snd_BUG_ON(!notif_event))
291                 return -EINVAL;
292         if (snd_BUG_ON((notif_event & MSG_TYPE_MASK) != MSG_TYPE_NOTIFY))
293                 return -EINVAL;
294         if (snd_BUG_ON(notif_event & MSG_CANCEL_NOTIFY_MASK))
295                 return -EINVAL;
296 
297         init_waitqueue_entry(&wait, current);
298 
299         mutex_lock(&mgr->msg_lock);
300         /* send the message */
301         err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event);  /* send and mark the notification event pending */
302         if(err) {
303                 mutex_unlock(&mgr->msg_lock);
304                 return err;
305         }
306 
307         set_current_state(TASK_UNINTERRUPTIBLE);
308         add_wait_queue(&mgr->msg_sleep, &wait);
309         mutex_unlock(&mgr->msg_lock);
310         timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
311         remove_wait_queue(&mgr->msg_sleep, &wait);
312 
313         if (! timeout) {
314                 /* error - no ack */
315                 dev_err(&mgr->pci->dev,
316                         "error: notification %x not received\n", notif_event);
317                 return -EIO;
318         }
319 
320         return 0;
321 }
322 
323 
324 int snd_mixart_send_msg_nonblock(struct mixart_mgr *mgr, struct mixart_msg *request)
325 {
326         u32 message_frame;
327         int err;
328 
329         /* just send the message (do not mark it as a pending one) */
330         mutex_lock(&mgr->msg_lock);
331         err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);
332         mutex_unlock(&mgr->msg_lock);
333 
334         /* the answer will be handled by snd_struct mixart_msgasklet()  */
335         atomic_inc(&mgr->msg_processed);
336 
337         return err;
338 }
339 
340 
341 /* common buffer of interrupt to send/receive messages */
342 static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
343 
344 
345 static void snd_mixart_process_msg(struct mixart_mgr *mgr)
346 {
347         struct mixart_msg resp;
348         u32 msg, addr, type;
349         int err;
350 
351         while (mgr->msg_fifo_readptr != mgr->msg_fifo_writeptr) {
352                 msg = mgr->msg_fifo[mgr->msg_fifo_readptr];
353                 mgr->msg_fifo_readptr++;
354                 mgr->msg_fifo_readptr %= MSG_FIFO_SIZE;
355 
356                 /* process the message ... */
357                 addr = msg & ~MSG_TYPE_MASK;
358                 type = msg & MSG_TYPE_MASK;
359 
360                 switch (type) {
361                 case MSG_TYPE_ANSWER:
362                         /* answer to a message on that we did not wait for (send_msg_nonblock) */
363                         resp.message_id = 0;
364                         resp.data = mixart_msg_data;
365                         resp.size = sizeof(mixart_msg_data);
366                         err = get_msg(mgr, &resp, addr);
367                         if( err < 0 ) {
368                                 dev_err(&mgr->pci->dev,
369                                         "error(%d) reading mf %x\n",
370                                         err, msg);
371                                 break;
372                         }
373 
374                         switch(resp.message_id) {
375                         case MSG_STREAM_START_INPUT_STAGE_PACKET:
376                         case MSG_STREAM_START_OUTPUT_STAGE_PACKET:
377                         case MSG_STREAM_STOP_INPUT_STAGE_PACKET:
378                         case MSG_STREAM_STOP_OUTPUT_STAGE_PACKET:
379                                 if(mixart_msg_data[0])
380                                         dev_err(&mgr->pci->dev,
381                                                 "error MSG_STREAM_ST***_***PUT_STAGE_PACKET status=%x\n",
382                                                 mixart_msg_data[0]);
383                                 break;
384                         default:
385                                 dev_dbg(&mgr->pci->dev,
386                                         "received mf(%x) : msg_id(%x) uid(%x, %x) size(%zd)\n",
387                                            msg, resp.message_id, resp.uid.object_id, resp.uid.desc, resp.size);
388                                 break;
389                         }
390                         break;
391                 case MSG_TYPE_NOTIFY:
392                         /* msg contains no address ! do not get_msg() ! */
393                 case MSG_TYPE_COMMAND:
394                         /* get_msg() necessary */
395                 default:
396                         dev_err(&mgr->pci->dev,
397                                 "doesn't know what to do with message %x\n",
398                                 msg);
399                 } /* switch type */
400 
401                 /* decrement counter */
402                 atomic_dec(&mgr->msg_processed);
403 
404         } /* while there is a msg in fifo */
405 }
406 
407 
408 irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
409 {
410         struct mixart_mgr *mgr = dev_id;
411         u32 it_reg;
412 
413         it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));
414         if( !(it_reg & MIXART_OIDI) ) {
415                 /* this device did not cause the interrupt */
416                 return IRQ_NONE;
417         }
418 
419         /* mask all interrupts */
420         writel_le(MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG(mgr, MIXART_PCI_OMIMR_OFFSET));
421 
422         /* outdoorbell register clear */
423         it_reg = readl(MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
424         writel(it_reg, MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
425 
426         /* clear interrupt */
427         writel_le( MIXART_OIDI, MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET) );
428 
429         return IRQ_WAKE_THREAD;
430 }
431 
432 irqreturn_t snd_mixart_threaded_irq(int irq, void *dev_id)
433 {
434         struct mixart_mgr *mgr = dev_id;
435         int err;
436         struct mixart_msg resp;
437         u32 msg;
438 
439         mutex_lock(&mgr->lock);
440         /* process interrupt */
441         while (retrieve_msg_frame(mgr, &msg)) {
442 
443                 switch (msg & MSG_TYPE_MASK) {
444                 case MSG_TYPE_COMMAND:
445                         resp.message_id = 0;
446                         resp.data = mixart_msg_data;
447                         resp.size = sizeof(mixart_msg_data);
448                         err = get_msg(mgr, &resp, msg & ~MSG_TYPE_MASK);
449                         if( err < 0 ) {
450                                 dev_err(&mgr->pci->dev,
451                                         "interrupt: error(%d) reading mf %x\n",
452                                         err, msg);
453                                 break;
454                         }
455 
456                         if(resp.message_id == MSG_SERVICES_TIMER_NOTIFY) {
457                                 int i;
458                                 struct mixart_timer_notify *notify;
459                                 notify = (struct mixart_timer_notify *)mixart_msg_data;
460 
461                                 for(i=0; i<notify->stream_count; i++) {
462 
463                                         u32 buffer_id = notify->streams[i].buffer_id;
464                                         unsigned int chip_number =  (buffer_id & MIXART_NOTIFY_CARD_MASK) >> MIXART_NOTIFY_CARD_OFFSET; /* card0 to 3 */
465                                         unsigned int pcm_number  =  (buffer_id & MIXART_NOTIFY_PCM_MASK ) >> MIXART_NOTIFY_PCM_OFFSET;  /* pcm0 to 3  */
466                                         unsigned int sub_number  =   buffer_id & MIXART_NOTIFY_SUBS_MASK;             /* 0 to MIXART_PLAYBACK_STREAMS */
467                                         unsigned int is_capture  = ((buffer_id & MIXART_NOTIFY_CAPT_MASK) != 0);      /* playback == 0 / capture == 1 */
468 
469                                         struct snd_mixart *chip  = mgr->chip[chip_number];
470                                         struct mixart_stream *stream;
471 
472                                         if ((chip_number >= mgr->num_cards) || (pcm_number >= MIXART_PCM_TOTAL) || (sub_number >= MIXART_PLAYBACK_STREAMS)) {
473                                                 dev_err(&mgr->pci->dev,
474                                                         "error MSG_SERVICES_TIMER_NOTIFY buffer_id (%x) pos(%d)\n",
475                                                            buffer_id, notify->streams[i].sample_pos_low_part);
476                                                 break;
477                                         }
478 
479                                         if (is_capture)
480                                                 stream = &chip->capture_stream[pcm_number];
481                                         else
482                                                 stream = &chip->playback_stream[pcm_number][sub_number];
483 
484                                         if (stream->substream && (stream->status == MIXART_STREAM_STATUS_RUNNING)) {
485                                                 struct snd_pcm_runtime *runtime = stream->substream->runtime;
486                                                 int elapsed = 0;
487                                                 u64 sample_count = ((u64)notify->streams[i].sample_pos_high_part) << 32;
488                                                 sample_count |= notify->streams[i].sample_pos_low_part;
489 
490                                                 while (1) {
491                                                         u64 new_elapse_pos = stream->abs_period_elapsed +  runtime->period_size;
492 
493                                                         if (new_elapse_pos > sample_count) {
494                                                                 break; /* while */
495                                                         }
496                                                         else {
497                                                                 elapsed = 1;
498                                                                 stream->buf_periods++;
499                                                                 if (stream->buf_periods >= runtime->periods)
500                                                                         stream->buf_periods = 0;
501 
502                                                                 stream->abs_period_elapsed = new_elapse_pos;
503                                                         }
504                                                 }
505                                                 stream->buf_period_frag = (u32)( sample_count - stream->abs_period_elapsed );
506 
507                                                 if(elapsed) {
508                                                         mutex_unlock(&mgr->lock);
509                                                         snd_pcm_period_elapsed(stream->substream);
510                                                         mutex_lock(&mgr->lock);
511                                                 }
512                                         }
513                                 }
514                                 break;
515                         }
516                         if(resp.message_id == MSG_SERVICES_REPORT_TRACES) {
517                                 if(resp.size > 1) {
518 #ifndef __BIG_ENDIAN
519                                         /* Traces are text: the swapped msg_data has to be swapped back ! */
520                                         int i;
521                                         for(i=0; i<(resp.size/4); i++) {
522                                                 (mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);
523                                         }
524 #endif
525                                         ((char*)mixart_msg_data)[resp.size - 1] = 0;
526                                         dev_dbg(&mgr->pci->dev,
527                                                 "MIXART TRACE : %s\n",
528                                                 (char *)mixart_msg_data);
529                                 }
530                                 break;
531                         }
532 
533                         dev_dbg(&mgr->pci->dev, "command %x not handled\n",
534                                 resp.message_id);
535                         break;
536 
537                 case MSG_TYPE_NOTIFY:
538                         if(msg & MSG_CANCEL_NOTIFY_MASK) {
539                                 msg &= ~MSG_CANCEL_NOTIFY_MASK;
540                                 dev_err(&mgr->pci->dev,
541                                         "canceled notification %x !\n", msg);
542                         }
543                         /* no break, continue ! */
544                 case MSG_TYPE_ANSWER:
545                         /* answer or notification to a message we are waiting for*/
546                         mutex_lock(&mgr->msg_lock);
547                         if( (msg & ~MSG_TYPE_MASK) == mgr->pending_event ) {
548                                 wake_up(&mgr->msg_sleep);
549                                 mgr->pending_event = 0;
550                         }
551                         /* answer to a message we did't want to wait for */
552                         else {
553                                 mgr->msg_fifo[mgr->msg_fifo_writeptr] = msg;
554                                 mgr->msg_fifo_writeptr++;
555                                 mgr->msg_fifo_writeptr %= MSG_FIFO_SIZE;
556                                 snd_mixart_process_msg(mgr);
557                         }
558                         mutex_unlock(&mgr->msg_lock);
559                         break;
560                 case MSG_TYPE_REQUEST:
561                 default:
562                         dev_dbg(&mgr->pci->dev,
563                                 "interrupt received request %x\n", msg);
564                         /* TODO : are there things to do here ? */
565                         break;
566                 } /* switch on msg type */
567         } /* while there are msgs */
568 
569         /* allow interrupt again */
570         writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
571 
572         mutex_unlock(&mgr->lock);
573 
574         return IRQ_HANDLED;
575 }
576 
577 
578 void snd_mixart_init_mailbox(struct mixart_mgr *mgr)
579 {
580         writel( 0, MIXART_MEM( mgr, MSG_HOST_RSC_PROTECTION ) );
581         writel( 0, MIXART_MEM( mgr, MSG_AGENT_RSC_PROTECTION ) );
582 
583         /* allow outbound messagebox to generate interrupts */
584         if(mgr->irq >= 0) {
585                 writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
586         }
587         return;
588 }
589 
590 void snd_mixart_exit_mailbox(struct mixart_mgr *mgr)
591 {
592         /* no more interrupts on outbound messagebox */
593         writel_le( MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
594         return;
595 }
596 
597 void snd_mixart_reset_board(struct mixart_mgr *mgr)
598 {
599         /* reset miXart */
600         writel_be( 1, MIXART_REG(mgr, MIXART_BA1_BRUTAL_RESET_OFFSET) );
601         return;
602 }
603 

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