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