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Linux/sound/pci/mixart/mixart_core.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * Driver for Digigram miXart soundcards
  4  *
  5  * low level interface with interrupt handling and mail box implementation
  6  *
  7  * Copyright (c) 2003 by Digigram <alsa@digigram.com>
  8  */
  9 
 10 #include <linux/interrupt.h>
 11 #include <linux/mutex.h>
 12 #include <linux/pci.h>
 13 #include <linux/io.h>
 14 
 15 #include <sound/core.h>
 16 #include "mixart.h"
 17 #include "mixart_hwdep.h"
 18 #include "mixart_core.h"
 19 
 20 
 21 #define MSG_TIMEOUT_JIFFIES         (400 * HZ) / 1000 /* 400 ms */
 22 
 23 #define MSG_DESCRIPTOR_SIZE         0x24
 24 #define MSG_HEADER_SIZE             (MSG_DESCRIPTOR_SIZE + 4)
 25 
 26 #define MSG_DEFAULT_SIZE            512
 27 
 28 #define MSG_TYPE_MASK               0x00000003    /* mask for following types */
 29 #define MSG_TYPE_NOTIFY             0             /* embedded -> driver (only notification, do not get_msg() !) */
 30 #define MSG_TYPE_COMMAND            1             /* driver <-> embedded (a command has no answer) */
 31 #define MSG_TYPE_REQUEST            2             /* driver -> embedded (request will get an answer back) */
 32 #define MSG_TYPE_ANSWER             3             /* embedded -> driver */
 33 #define MSG_CANCEL_NOTIFY_MASK      0x80000000    /* this bit is set for a notification that has been canceled */
 34 
 35 
 36 static int retrieve_msg_frame(struct mixart_mgr *mgr, u32 *msg_frame)
 37 {
 38         /* read the message frame fifo */
 39         u32 headptr, tailptr;
 40 
 41         tailptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
 42         headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_HEAD));
 43 
 44         if (tailptr == headptr)
 45                 return 0; /* no message posted */
 46 
 47         if (tailptr < MSG_OUTBOUND_POST_STACK)
 48                 return 0; /* error */
 49         if (tailptr >= MSG_OUTBOUND_POST_STACK + MSG_BOUND_STACK_SIZE)
 50                 return 0; /* error */
 51 
 52         *msg_frame = readl_be(MIXART_MEM(mgr, tailptr));
 53 
 54         /* increment the tail index */
 55         tailptr += 4;
 56         if( tailptr >= (MSG_OUTBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
 57                 tailptr = MSG_OUTBOUND_POST_STACK;
 58         writel_be(tailptr, MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
 59 
 60         return 1;
 61 }
 62 
 63 static int get_msg(struct mixart_mgr *mgr, struct mixart_msg *resp,
 64                    u32 msg_frame_address )
 65 {
 66         u32  headptr;
 67         u32  size;
 68         int  err;
 69 #ifndef __BIG_ENDIAN
 70         unsigned int i;
 71 #endif
 72 
 73         mutex_lock(&mgr->msg_lock);
 74         err = 0;
 75 
 76         /* copy message descriptor from miXart to driver */
 77         size                =  readl_be(MIXART_MEM(mgr, msg_frame_address));       /* size of descriptor + response */
 78         resp->message_id    =  readl_be(MIXART_MEM(mgr, msg_frame_address + 4));   /* dwMessageID */
 79         resp->uid.object_id =  readl_be(MIXART_MEM(mgr, msg_frame_address + 8));   /* uidDest */
 80         resp->uid.desc      =  readl_be(MIXART_MEM(mgr, msg_frame_address + 12));  /* */
 81 
 82         if( (size < MSG_DESCRIPTOR_SIZE) || (resp->size < (size - MSG_DESCRIPTOR_SIZE))) {
 83                 err = -EINVAL;
 84                 dev_err(&mgr->pci->dev,
 85                         "problem with response size = %d\n", size);
 86                 goto _clean_exit;
 87         }
 88         size -= MSG_DESCRIPTOR_SIZE;
 89 
 90         memcpy_fromio(resp->data, MIXART_MEM(mgr, msg_frame_address + MSG_HEADER_SIZE ), size);
 91         resp->size = size;
 92 
 93         /* swap if necessary */
 94 #ifndef __BIG_ENDIAN
 95         size /= 4; /* u32 size */
 96         for(i=0; i < size; i++) {
 97                 ((u32*)resp->data)[i] = be32_to_cpu(((__be32*)resp->data)[i]);
 98         }
 99 #endif
100 
101         /*
102          * free message frame address
103          */
104         headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
105 
106         if( (headptr < MSG_OUTBOUND_FREE_STACK) || ( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
107                 err = -EINVAL;
108                 goto _clean_exit;
109         }
110 
111         /* give address back to outbound fifo */
112         writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
113 
114         /* increment the outbound free head */
115         headptr += 4;
116         if( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
117                 headptr = MSG_OUTBOUND_FREE_STACK;
118 
119         writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
120 
121  _clean_exit:
122         mutex_unlock(&mgr->msg_lock);
123 
124         return err;
125 }
126 
127 
128 /*
129  * send a message to miXart. return: the msg_frame used for this message
130  */
131 /* call with mgr->msg_lock held! */
132 static int send_msg( struct mixart_mgr *mgr,
133                      struct mixart_msg *msg,
134                      int max_answersize,
135                      int mark_pending,
136                      u32 *msg_event)
137 {
138         u32 headptr, tailptr;
139         u32 msg_frame_address;
140         int i;
141 
142         if (snd_BUG_ON(msg->size % 4))
143                 return -EINVAL;
144 
145         /* get message frame address */
146         tailptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
147         headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_HEAD));
148 
149         if (tailptr == headptr) {
150                 dev_err(&mgr->pci->dev, "error: no message frame available\n");
151                 return -EBUSY;
152         }
153 
154         if( (tailptr < MSG_INBOUND_FREE_STACK) || (tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
155                 return -EINVAL;
156         }
157 
158         msg_frame_address = readl_be(MIXART_MEM(mgr, tailptr));
159         writel(0, MIXART_MEM(mgr, tailptr)); /* set address to zero on this fifo position */
160 
161         /* increment the inbound free tail */
162         tailptr += 4;
163         if( tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
164                 tailptr = MSG_INBOUND_FREE_STACK;
165 
166         writel_be(tailptr, MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
167 
168         /* TODO : use memcpy_toio() with intermediate buffer to copy the message */
169 
170         /* copy message descriptor to card memory */
171         writel_be( msg->size + MSG_DESCRIPTOR_SIZE,      MIXART_MEM(mgr, msg_frame_address) );      /* size of descriptor + request */
172         writel_be( msg->message_id ,                     MIXART_MEM(mgr, msg_frame_address + 4) );  /* dwMessageID */
173         writel_be( msg->uid.object_id,                   MIXART_MEM(mgr, msg_frame_address + 8) );  /* uidDest */
174         writel_be( msg->uid.desc,                        MIXART_MEM(mgr, msg_frame_address + 12) ); /* */
175         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 16) ); /* SizeHeader */
176         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 20) ); /* OffsetDLL_T16 */
177         writel_be( msg->size,                            MIXART_MEM(mgr, msg_frame_address + 24) ); /* SizeDLL_T16 */
178         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 28) ); /* OffsetDLL_DRV */
179         writel_be( 0,                                    MIXART_MEM(mgr, msg_frame_address + 32) ); /* SizeDLL_DRV */
180         writel_be( MSG_DESCRIPTOR_SIZE + max_answersize, MIXART_MEM(mgr, msg_frame_address + 36) ); /* dwExpectedAnswerSize */
181 
182         /* copy message data to card memory */
183         for( i=0; i < msg->size; i+=4 ) {
184                 writel_be( *(u32*)(msg->data + i), MIXART_MEM(mgr, MSG_HEADER_SIZE + msg_frame_address + i)  );
185         }
186 
187         if( mark_pending ) {
188                 if( *msg_event ) {
189                         /* the pending event is the notification we wait for ! */
190                         mgr->pending_event = *msg_event;
191                 }
192                 else {
193                         /* the pending event is the answer we wait for (same address than the request)! */
194                         mgr->pending_event = msg_frame_address;
195 
196                         /* copy address back to caller */
197                         *msg_event = msg_frame_address;
198                 }
199         }
200 
201         /* mark the frame as a request (will have an answer) */
202         msg_frame_address |= MSG_TYPE_REQUEST;
203 
204         /* post the frame */
205         headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
206 
207         if( (headptr < MSG_INBOUND_POST_STACK) || (headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE))) {
208                 return -EINVAL;
209         }
210 
211         writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
212 
213         /* increment the inbound post head */
214         headptr += 4;
215         if( headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
216                 headptr = MSG_INBOUND_POST_STACK;
217 
218         writel_be(headptr, MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
219 
220         return 0;
221 }
222 
223 
224 int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int max_resp_size, void *resp_data)
225 {
226         struct mixart_msg resp;
227         u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */
228         int err;
229         wait_queue_entry_t wait;
230         long timeout;
231 
232         init_waitqueue_entry(&wait, current);
233 
234         mutex_lock(&mgr->msg_lock);
235         /* send the message */
236         err = send_msg(mgr, request, max_resp_size, 1, &msg_frame);  /* send and mark the answer pending */
237         if (err) {
238                 mutex_unlock(&mgr->msg_lock);
239                 return err;
240         }
241 
242         set_current_state(TASK_UNINTERRUPTIBLE);
243         add_wait_queue(&mgr->msg_sleep, &wait);
244         mutex_unlock(&mgr->msg_lock);
245         timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
246         remove_wait_queue(&mgr->msg_sleep, &wait);
247 
248         if (! timeout) {
249                 /* error - no ack */
250                 dev_err(&mgr->pci->dev,
251                         "error: no response on msg %x\n", msg_frame);
252                 return -EIO;
253         }
254 
255         /* retrieve the answer into the same struct mixart_msg */
256         resp.message_id = 0;
257         resp.uid = (struct mixart_uid){0,0};
258         resp.data = resp_data;
259         resp.size = max_resp_size;
260 
261         err = get_msg(mgr, &resp, msg_frame);
262 
263         if( request->message_id != resp.message_id )
264                 dev_err(&mgr->pci->dev, "RESPONSE ERROR!\n");
265 
266         return err;
267 }
268 
269 
270 int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
271                                    struct mixart_msg *request, u32 notif_event)
272 {
273         int err;
274         wait_queue_entry_t wait;
275         long timeout;
276 
277         if (snd_BUG_ON(!notif_event))
278                 return -EINVAL;
279         if (snd_BUG_ON((notif_event & MSG_TYPE_MASK) != MSG_TYPE_NOTIFY))
280                 return -EINVAL;
281         if (snd_BUG_ON(notif_event & MSG_CANCEL_NOTIFY_MASK))
282                 return -EINVAL;
283 
284         init_waitqueue_entry(&wait, current);
285 
286         mutex_lock(&mgr->msg_lock);
287         /* send the message */
288         err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event);  /* send and mark the notification event pending */
289         if(err) {
290                 mutex_unlock(&mgr->msg_lock);
291                 return err;
292         }
293 
294         set_current_state(TASK_UNINTERRUPTIBLE);
295         add_wait_queue(&mgr->msg_sleep, &wait);
296         mutex_unlock(&mgr->msg_lock);
297         timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
298         remove_wait_queue(&mgr->msg_sleep, &wait);
299 
300         if (! timeout) {
301                 /* error - no ack */
302                 dev_err(&mgr->pci->dev,
303                         "error: notification %x not received\n", notif_event);
304                 return -EIO;
305         }
306 
307         return 0;
308 }
309 
310 
311 int snd_mixart_send_msg_nonblock(struct mixart_mgr *mgr, struct mixart_msg *request)
312 {
313         u32 message_frame;
314         int err;
315 
316         /* just send the message (do not mark it as a pending one) */
317         mutex_lock(&mgr->msg_lock);
318         err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);
319         mutex_unlock(&mgr->msg_lock);
320 
321         /* the answer will be handled by snd_struct mixart_msgasklet()  */
322         atomic_inc(&mgr->msg_processed);
323 
324         return err;
325 }
326 
327 
328 /* common buffer of interrupt to send/receive messages */
329 static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
330 
331 
332 static void snd_mixart_process_msg(struct mixart_mgr *mgr)
333 {
334         struct mixart_msg resp;
335         u32 msg, addr, type;
336         int err;
337 
338         while (mgr->msg_fifo_readptr != mgr->msg_fifo_writeptr) {
339                 msg = mgr->msg_fifo[mgr->msg_fifo_readptr];
340                 mgr->msg_fifo_readptr++;
341                 mgr->msg_fifo_readptr %= MSG_FIFO_SIZE;
342 
343                 /* process the message ... */
344                 addr = msg & ~MSG_TYPE_MASK;
345                 type = msg & MSG_TYPE_MASK;
346 
347                 switch (type) {
348                 case MSG_TYPE_ANSWER:
349                         /* answer to a message on that we did not wait for (send_msg_nonblock) */
350                         resp.message_id = 0;
351                         resp.data = mixart_msg_data;
352                         resp.size = sizeof(mixart_msg_data);
353                         err = get_msg(mgr, &resp, addr);
354                         if( err < 0 ) {
355                                 dev_err(&mgr->pci->dev,
356                                         "error(%d) reading mf %x\n",
357                                         err, msg);
358                                 break;
359                         }
360 
361                         switch(resp.message_id) {
362                         case MSG_STREAM_START_INPUT_STAGE_PACKET:
363                         case MSG_STREAM_START_OUTPUT_STAGE_PACKET:
364                         case MSG_STREAM_STOP_INPUT_STAGE_PACKET:
365                         case MSG_STREAM_STOP_OUTPUT_STAGE_PACKET:
366                                 if(mixart_msg_data[0])
367                                         dev_err(&mgr->pci->dev,
368                                                 "error MSG_STREAM_ST***_***PUT_STAGE_PACKET status=%x\n",
369                                                 mixart_msg_data[0]);
370                                 break;
371                         default:
372                                 dev_dbg(&mgr->pci->dev,
373                                         "received mf(%x) : msg_id(%x) uid(%x, %x) size(%zd)\n",
374                                            msg, resp.message_id, resp.uid.object_id, resp.uid.desc, resp.size);
375                                 break;
376                         }
377                         break;
378                 case MSG_TYPE_NOTIFY:
379                         /* msg contains no address ! do not get_msg() ! */
380                 case MSG_TYPE_COMMAND:
381                         /* get_msg() necessary */
382                 default:
383                         dev_err(&mgr->pci->dev,
384                                 "doesn't know what to do with message %x\n",
385                                 msg);
386                 } /* switch type */
387 
388                 /* decrement counter */
389                 atomic_dec(&mgr->msg_processed);
390 
391         } /* while there is a msg in fifo */
392 }
393 
394 
395 irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
396 {
397         struct mixart_mgr *mgr = dev_id;
398         u32 it_reg;
399 
400         it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));
401         if( !(it_reg & MIXART_OIDI) ) {
402                 /* this device did not cause the interrupt */
403                 return IRQ_NONE;
404         }
405 
406         /* mask all interrupts */
407         writel_le(MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG(mgr, MIXART_PCI_OMIMR_OFFSET));
408 
409         /* outdoorbell register clear */
410         it_reg = readl(MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
411         writel(it_reg, MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
412 
413         /* clear interrupt */
414         writel_le( MIXART_OIDI, MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET) );
415 
416         return IRQ_WAKE_THREAD;
417 }
418 
419 irqreturn_t snd_mixart_threaded_irq(int irq, void *dev_id)
420 {
421         struct mixart_mgr *mgr = dev_id;
422         int err;
423         struct mixart_msg resp;
424         u32 msg;
425 
426         mutex_lock(&mgr->lock);
427         /* process interrupt */
428         while (retrieve_msg_frame(mgr, &msg)) {
429 
430                 switch (msg & MSG_TYPE_MASK) {
431                 case MSG_TYPE_COMMAND:
432                         resp.message_id = 0;
433                         resp.data = mixart_msg_data;
434                         resp.size = sizeof(mixart_msg_data);
435                         err = get_msg(mgr, &resp, msg & ~MSG_TYPE_MASK);
436                         if( err < 0 ) {
437                                 dev_err(&mgr->pci->dev,
438                                         "interrupt: error(%d) reading mf %x\n",
439                                         err, msg);
440                                 break;
441                         }
442 
443                         if(resp.message_id == MSG_SERVICES_TIMER_NOTIFY) {
444                                 int i;
445                                 struct mixart_timer_notify *notify;
446                                 notify = (struct mixart_timer_notify *)mixart_msg_data;
447 
448                                 for(i=0; i<notify->stream_count; i++) {
449 
450                                         u32 buffer_id = notify->streams[i].buffer_id;
451                                         unsigned int chip_number =  (buffer_id & MIXART_NOTIFY_CARD_MASK) >> MIXART_NOTIFY_CARD_OFFSET; /* card0 to 3 */
452                                         unsigned int pcm_number  =  (buffer_id & MIXART_NOTIFY_PCM_MASK ) >> MIXART_NOTIFY_PCM_OFFSET;  /* pcm0 to 3  */
453                                         unsigned int sub_number  =   buffer_id & MIXART_NOTIFY_SUBS_MASK;             /* 0 to MIXART_PLAYBACK_STREAMS */
454                                         unsigned int is_capture  = ((buffer_id & MIXART_NOTIFY_CAPT_MASK) != 0);      /* playback == 0 / capture == 1 */
455 
456                                         struct snd_mixart *chip  = mgr->chip[chip_number];
457                                         struct mixart_stream *stream;
458 
459                                         if ((chip_number >= mgr->num_cards) || (pcm_number >= MIXART_PCM_TOTAL) || (sub_number >= MIXART_PLAYBACK_STREAMS)) {
460                                                 dev_err(&mgr->pci->dev,
461                                                         "error MSG_SERVICES_TIMER_NOTIFY buffer_id (%x) pos(%d)\n",
462                                                            buffer_id, notify->streams[i].sample_pos_low_part);
463                                                 break;
464                                         }
465 
466                                         if (is_capture)
467                                                 stream = &chip->capture_stream[pcm_number];
468                                         else
469                                                 stream = &chip->playback_stream[pcm_number][sub_number];
470 
471                                         if (stream->substream && (stream->status == MIXART_STREAM_STATUS_RUNNING)) {
472                                                 struct snd_pcm_runtime *runtime = stream->substream->runtime;
473                                                 int elapsed = 0;
474                                                 u64 sample_count = ((u64)notify->streams[i].sample_pos_high_part) << 32;
475                                                 sample_count |= notify->streams[i].sample_pos_low_part;
476 
477                                                 while (1) {
478                                                         u64 new_elapse_pos = stream->abs_period_elapsed +  runtime->period_size;
479 
480                                                         if (new_elapse_pos > sample_count) {
481                                                                 break; /* while */
482                                                         }
483                                                         else {
484                                                                 elapsed = 1;
485                                                                 stream->buf_periods++;
486                                                                 if (stream->buf_periods >= runtime->periods)
487                                                                         stream->buf_periods = 0;
488 
489                                                                 stream->abs_period_elapsed = new_elapse_pos;
490                                                         }
491                                                 }
492                                                 stream->buf_period_frag = (u32)( sample_count - stream->abs_period_elapsed );
493 
494                                                 if(elapsed) {
495                                                         mutex_unlock(&mgr->lock);
496                                                         snd_pcm_period_elapsed(stream->substream);
497                                                         mutex_lock(&mgr->lock);
498                                                 }
499                                         }
500                                 }
501                                 break;
502                         }
503                         if(resp.message_id == MSG_SERVICES_REPORT_TRACES) {
504                                 if(resp.size > 1) {
505 #ifndef __BIG_ENDIAN
506                                         /* Traces are text: the swapped msg_data has to be swapped back ! */
507                                         int i;
508                                         for(i=0; i<(resp.size/4); i++) {
509                                                 ((__be32*)mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);
510                                         }
511 #endif
512                                         ((char*)mixart_msg_data)[resp.size - 1] = 0;
513                                         dev_dbg(&mgr->pci->dev,
514                                                 "MIXART TRACE : %s\n",
515                                                 (char *)mixart_msg_data);
516                                 }
517                                 break;
518                         }
519 
520                         dev_dbg(&mgr->pci->dev, "command %x not handled\n",
521                                 resp.message_id);
522                         break;
523 
524                 case MSG_TYPE_NOTIFY:
525                         if(msg & MSG_CANCEL_NOTIFY_MASK) {
526                                 msg &= ~MSG_CANCEL_NOTIFY_MASK;
527                                 dev_err(&mgr->pci->dev,
528                                         "canceled notification %x !\n", msg);
529                         }
530                         /* fall through */
531                 case MSG_TYPE_ANSWER:
532                         /* answer or notification to a message we are waiting for*/
533                         mutex_lock(&mgr->msg_lock);
534                         if( (msg & ~MSG_TYPE_MASK) == mgr->pending_event ) {
535                                 wake_up(&mgr->msg_sleep);
536                                 mgr->pending_event = 0;
537                         }
538                         /* answer to a message we did't want to wait for */
539                         else {
540                                 mgr->msg_fifo[mgr->msg_fifo_writeptr] = msg;
541                                 mgr->msg_fifo_writeptr++;
542                                 mgr->msg_fifo_writeptr %= MSG_FIFO_SIZE;
543                                 snd_mixart_process_msg(mgr);
544                         }
545                         mutex_unlock(&mgr->msg_lock);
546                         break;
547                 case MSG_TYPE_REQUEST:
548                 default:
549                         dev_dbg(&mgr->pci->dev,
550                                 "interrupt received request %x\n", msg);
551                         /* TODO : are there things to do here ? */
552                         break;
553                 } /* switch on msg type */
554         } /* while there are msgs */
555 
556         /* allow interrupt again */
557         writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
558 
559         mutex_unlock(&mgr->lock);
560 
561         return IRQ_HANDLED;
562 }
563 
564 
565 void snd_mixart_init_mailbox(struct mixart_mgr *mgr)
566 {
567         writel( 0, MIXART_MEM( mgr, MSG_HOST_RSC_PROTECTION ) );
568         writel( 0, MIXART_MEM( mgr, MSG_AGENT_RSC_PROTECTION ) );
569 
570         /* allow outbound messagebox to generate interrupts */
571         if(mgr->irq >= 0) {
572                 writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
573         }
574         return;
575 }
576 
577 void snd_mixart_exit_mailbox(struct mixart_mgr *mgr)
578 {
579         /* no more interrupts on outbound messagebox */
580         writel_le( MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
581         return;
582 }
583 
584 void snd_mixart_reset_board(struct mixart_mgr *mgr)
585 {
586         /* reset miXart */
587         writel_be( 1, MIXART_REG(mgr, MIXART_BA1_BRUTAL_RESET_OFFSET) );
588         return;
589 }
590 

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