sound/pci/mixart/mixart_core.c

   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 }