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 <sound/driver.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/mutex.h>
  26
  27 #include <asm/io.h>
  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         snd_assert( tailptr >= MSG_OUTBOUND_POST_STACK, return 0); /* error */
  61         snd_assert( tailptr < (MSG_OUTBOUND_POST_STACK+MSG_BOUND_STACK_SIZE), return 0); /* error */
  62
  63         *msg_frame = readl_be(MIXART_MEM(mgr, tailptr));
  64
  65         /* increment the tail index */
  66         tailptr += 4;
  67         if( tailptr >= (MSG_OUTBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
  68                 tailptr = MSG_OUTBOUND_POST_STACK;
  69         writel_be(tailptr, MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
  70
  71         return 1;
  72 }
  73
  74 static int get_msg(struct mixart_mgr *mgr, struct mixart_msg *resp,
  75                    u32 msg_frame_address )
  76 {
  77         unsigned long flags;
  78         u32  headptr;
  79         u32  size;
  80         int  err;
  81 #ifndef __BIG_ENDIAN
  82         unsigned int i;
  83 #endif
  84
  85         spin_lock_irqsave(&mgr->msg_lock, flags);
  86         err = 0;
  87
  88         /* copy message descriptor from miXart to driver */
  89         size                =  readl_be(MIXART_MEM(mgr, msg_frame_address));       /* size of descriptor + response */
  90         resp->message_id    =  readl_be(MIXART_MEM(mgr, msg_frame_address + 4));   /* dwMessageID */
  91         resp->uid.object_id =  readl_be(MIXART_MEM(mgr, msg_frame_address + 8));   /* uidDest */
  92         resp->uid.desc      =  readl_be(MIXART_MEM(mgr, msg_frame_address + 12));  /* */
  93
  94         if( (size < MSG_DESCRIPTOR_SIZE) || (resp->size < (size - MSG_DESCRIPTOR_SIZE))) {
  95                 err = -EINVAL;
  96                 snd_printk(KERN_ERR "problem with response size = %d\n", size);
  97                 goto _clean_exit;
  98         }
  99         size -= MSG_DESCRIPTOR_SIZE;
 100
 101         memcpy_fromio(resp->data, MIXART_MEM(mgr, msg_frame_address + MSG_HEADER_SIZE ), size);
 102         resp->size = size;
 103
 104         /* swap if necessary */
 105 #ifndef __BIG_ENDIAN
 106         size /= 4; /* u32 size */
 107         for(i=0; i < size; i++) {
 108                 ((u32*)resp->data)[i] = be32_to_cpu(((u32*)resp->data)[i]);
 109         }
 110 #endif
 111
 112         /*
 113          * free message frame address
 114          */
 115         headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 116
 117         if( (headptr < MSG_OUTBOUND_FREE_STACK) || ( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
 118                 err = -EINVAL;
 119                 goto _clean_exit;
 120         }
 121
 122         /* give address back to outbound fifo */
 123         writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
 124
 125         /* increment the outbound free head */
 126         headptr += 4;
 127         if( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
 128                 headptr = MSG_OUTBOUND_FREE_STACK;
 129
 130         writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 131
 132  _clean_exit:
 133         spin_unlock_irqrestore(&mgr->msg_lock, flags);
 134
 135         return err;
 136 }
 137
 138
 139 /*
 140  * send a message to miXart. return: the msg_frame used for this message
 141  */
 142 /* call with mgr->msg_lock held! */
 143 static int send_msg( struct mixart_mgr *mgr,
 144                      struct mixart_msg *msg,
 145                      int max_answersize,
 146                      int mark_pending,
 147                      u32 *msg_event)
 148 {
 149         u32 headptr, tailptr;
 150         u32 msg_frame_address;
 151         int err, i;
 152
 153         snd_assert(msg->size % 4 == 0, return -EINVAL);
 154
 155         err = 0;
 156
 157         /* get message frame address */
 158         tailptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
 159         headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_HEAD));
 160
 161         if (tailptr == headptr) {
 162                 snd_printk(KERN_ERR "error: no message frame available\n");
 163                 return -EBUSY;
 164         }
 165
 166         if( (tailptr < MSG_INBOUND_FREE_STACK) || (tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
 167                 return -EINVAL;
 168         }
 169
 170         msg_frame_address = readl_be(MIXART_MEM(mgr, tailptr));
 171         writel(0, MIXART_MEM(mgr, tailptr)); /* set address to zero on this fifo position */
 172
 173         /* increment the inbound free tail */
 174         tailptr += 4;
 175         if( tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
 176                 tailptr = MSG_INBOUND_FREE_STACK;
 177
 178         writel_be(tailptr, MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
 179
 180         /* TODO : use memcpy_toio() with intermediate buffer to copy the message */
 181
 182         /* copy message descriptor to card memory */
 183         writel_be( msg->size + MSG_DESCRIPTOR_SIZE,      MIXART_MEM(mgr, msg_frame_address) );      /* size of descriptor + request */
 184         writel_be( msg->message_id ,                     MIXART_MEM(mgr, msg_frame_address + 4) );  /* dwMessageID */
 185         writel_be( msg->uid.object_id,                   MIXART_MEM(mgr, msg_frame_address + 8) );  /* uidDest */
 186         writel_be( msg->uid.desc,                        MIXART_MEM(mgr, msg_frame_address + 12) ); /* */
 187         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 16) ); /* SizeHeader */
 188         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 20) ); /* OffsetDLL_T16 */
 189         writel_be( msg->size,                            MIXART_MEM(mgr, msg_frame_address + 24) ); /* SizeDLL_T16 */
 190         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 28) ); /* OffsetDLL_DRV */
 191         writel_be( 0,                                    MIXART_MEM(mgr, msg_frame_address + 32) ); /* SizeDLL_DRV */
 192         writel_be( MSG_DESCRIPTOR_SIZE + max_answersize, MIXART_MEM(mgr, msg_frame_address + 36) ); /* dwExpectedAnswerSize */
 193
 194         /* copy message data to card memory */
 195         for( i=0; i < msg->size; i+=4 ) {
 196                 writel_be( *(u32*)(msg->data + i), MIXART_MEM(mgr, MSG_HEADER_SIZE + msg_frame_address + i)  );
 197         }
 198
 199         if( mark_pending ) {
 200                 if( *msg_event ) {
 201                         /* the pending event is the notification we wait for ! */
 202                         mgr->pending_event = *msg_event;
 203                 }
 204                 else {
 205                         /* the pending event is the answer we wait for (same address than the request)! */
 206                         mgr->pending_event = msg_frame_address;
 207
 208                         /* copy address back to caller */
 209                         *msg_event = msg_frame_address;
 210                 }
 211         }
 212
 213         /* mark the frame as a request (will have an answer) */
 214         msg_frame_address |= MSG_TYPE_REQUEST;
 215
 216         /* post the frame */
 217         headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
 218
 219         if( (headptr < MSG_INBOUND_POST_STACK) || (headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE))) {
 220                 return -EINVAL;
 221         }
 222
 223         writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
 224
 225         /* increment the inbound post head */
 226         headptr += 4;
 227         if( headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
 228                 headptr = MSG_INBOUND_POST_STACK;
 229
 230         writel_be(headptr, MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
 231
 232         return 0;
 233 }
 234
 235
 236 int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int max_resp_size, void *resp_data)
 237 {
 238         struct mixart_msg resp;
 239         u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */
 240         int err;
 241         wait_queue_t wait;
 242         long timeout;
 243
 244         mutex_lock(&mgr->msg_mutex);
 245
 246         init_waitqueue_entry(&wait, current);
 247
 248         spin_lock_irq(&mgr->msg_lock);
 249         /* send the message */
 250         err = send_msg(mgr, request, max_resp_size, 1, &msg_frame);  /* send and mark the answer pending */
 251         if (err) {
 252                 spin_unlock_irq(&mgr->msg_lock);
 253                 mutex_unlock(&mgr->msg_mutex);
 254                 return err;
 255         }
 256
 257         set_current_state(TASK_UNINTERRUPTIBLE);
 258         add_wait_queue(&mgr->msg_sleep, &wait);
 259         spin_unlock_irq(&mgr->msg_lock);
 260         timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
 261         remove_wait_queue(&mgr->msg_sleep, &wait);
 262
 263         if (! timeout) {
 264                 /* error - no ack */
 265                 mutex_unlock(&mgr->msg_mutex);
 266                 snd_printk(KERN_ERR "error: no reponse on msg %x\n", msg_frame);
 267                 return -EIO;
 268         }
 269
 270         /* retrieve the answer into the same struct mixart_msg */
 271         resp.message_id = 0;
 272         resp.uid = (struct mixart_uid){0,0};
 273         resp.data = resp_data;
 274         resp.size = max_resp_size;
 275
 276         err = get_msg(mgr, &resp, msg_frame);
 277
 278         if( request->message_id != resp.message_id )
 279                 snd_printk(KERN_ERR "REPONSE ERROR!\n");
 280
 281         mutex_unlock(&mgr->msg_mutex);
 282         return err;
 283 }
 284
 285
 286 int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
 287                                    struct mixart_msg *request, u32 notif_event)
 288 {
 289         int err;
 290         wait_queue_t wait;
 291         long timeout;
 292
 293         snd_assert(notif_event != 0, return -EINVAL);
 294         snd_assert((notif_event & MSG_TYPE_MASK) == MSG_TYPE_NOTIFY, return -EINVAL);
 295         snd_assert((notif_event & MSG_CANCEL_NOTIFY_MASK) == 0, return -EINVAL);
 296
 297         mutex_lock(&mgr->msg_mutex);
 298
 299         init_waitqueue_entry(&wait, current);
 300
 301         spin_lock_irq(&mgr->msg_lock);
 302         /* send the message */
 303         err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event);  /* send and mark the notification event pending */
 304         if(err) {
 305                 spin_unlock_irq(&mgr->msg_lock);
 306                 mutex_unlock(&mgr->msg_mutex);
 307                 return err;
 308         }
 309
 310         set_current_state(TASK_UNINTERRUPTIBLE);
 311         add_wait_queue(&mgr->msg_sleep, &wait);
 312         spin_unlock_irq(&mgr->msg_lock);
 313         timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
 314         remove_wait_queue(&mgr->msg_sleep, &wait);
 315
 316         if (! timeout) {
 317                 /* error - no ack */
 318                 mutex_unlock(&mgr->msg_mutex);
 319                 snd_printk(KERN_ERR "error: notification %x not received\n", notif_event);
 320                 return -EIO;
 321         }
 322
 323         mutex_unlock(&mgr->msg_mutex);
 324         return 0;
 325 }
 326
 327
 328 int snd_mixart_send_msg_nonblock(struct mixart_mgr *mgr, struct mixart_msg *request)
 329 {
 330         u32 message_frame;
 331         unsigned long flags;
 332         int err;
 333
 334         /* just send the message (do not mark it as a pending one) */
 335         spin_lock_irqsave(&mgr->msg_lock, flags);
 336         err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);
 337         spin_unlock_irqrestore(&mgr->msg_lock, flags);
 338
 339         /* the answer will be handled by snd_struct mixart_msgasklet()  */
 340         atomic_inc(&mgr->msg_processed);
 341
 342         return err;
 343 }
 344
 345
 346 /* common buffer of tasklet and interrupt to send/receive messages */
 347 static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
 348
 349
 350 void snd_mixart_msg_tasklet(unsigned long arg)
 351 {
 352         struct mixart_mgr *mgr = ( struct mixart_mgr*)(arg);
 353         struct mixart_msg resp;
 354         u32 msg, addr, type;
 355         int err;
 356
 357         spin_lock(&mgr->lock);
 358
 359         while (mgr->msg_fifo_readptr != mgr->msg_fifo_writeptr) {
 360                 msg = mgr->msg_fifo[mgr->msg_fifo_readptr];
 361                 mgr->msg_fifo_readptr++;
 362                 mgr->msg_fifo_readptr %= MSG_FIFO_SIZE;
 363
 364                 /* process the message ... */
 365                 addr = msg & ~MSG_TYPE_MASK;
 366                 type = msg & MSG_TYPE_MASK;
 367
 368                 switch (type) {
 369                 case MSG_TYPE_ANSWER:
 370                         /* answer to a message on that we did not wait for (send_msg_nonblock) */
 371                         resp.message_id = 0;
 372                         resp.data = mixart_msg_data;
 373                         resp.size = sizeof(mixart_msg_data);
 374                         err = get_msg(mgr, &resp, addr);
 375                         if( err < 0 ) {
 376                                 snd_printk(KERN_ERR "tasklet: error(%d) reading mf %x\n", err, msg);
 377                                 break;
 378                         }
 379
 380                         switch(resp.message_id) {
 381                         case MSG_STREAM_START_INPUT_STAGE_PACKET:
 382                         case MSG_STREAM_START_OUTPUT_STAGE_PACKET:
 383                         case MSG_STREAM_STOP_INPUT_STAGE_PACKET:
 384                         case MSG_STREAM_STOP_OUTPUT_STAGE_PACKET:
 385                                 if(mixart_msg_data[0])
 386                                         snd_printk(KERN_ERR "tasklet : error MSG_STREAM_ST***_***PUT_STAGE_PACKET status=%x\n", mixart_msg_data[0]);
 387                                 break;
 388                         default:
 389                                 snd_printdd("tasklet received mf(%x) : msg_id(%x) uid(%x, %x) size(%zd)\n",
 390                                            msg, resp.message_id, resp.uid.object_id, resp.uid.desc, resp.size);
 391                                 break;
 392                         }
 393                         break;
 394                 case MSG_TYPE_NOTIFY:
 395                         /* msg contains no address ! do not get_msg() ! */
 396                 case MSG_TYPE_COMMAND:
 397                         /* get_msg() necessary */
 398                 default:
 399                         snd_printk(KERN_ERR "tasklet doesn't know what to do with message %x\n", msg);
 400                 } /* switch type */
 401
 402                 /* decrement counter */
 403                 atomic_dec(&mgr->msg_processed);
 404
 405         } /* while there is a msg in fifo */
 406
 407         spin_unlock(&mgr->lock);
 408 }
 409
 410
 411 irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
 412 {
 413         struct mixart_mgr *mgr = dev_id;
 414         int err;
 415         struct mixart_msg resp;
 416
 417         u32 msg;
 418         u32 it_reg;
 419
 420         spin_lock(&mgr->lock);
 421
 422         it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));
 423         if( !(it_reg & MIXART_OIDI) ) {
 424                 /* this device did not cause the interrupt */
 425                 spin_unlock(&mgr->lock);
 426                 return IRQ_NONE;
 427         }
 428
 429         /* mask all interrupts */
 430         writel_le(MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG(mgr, MIXART_PCI_OMIMR_OFFSET));
 431
 432         /* outdoorbell register clear */
 433         it_reg = readl(MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
 434         writel(it_reg, MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
 435
 436         /* clear interrupt */
 437         writel_le( MIXART_OIDI, MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET) );
 438
 439         /* process interrupt */
 440         while (retrieve_msg_frame(mgr, &msg)) {
 441
 442                 switch (msg & MSG_TYPE_MASK) {
 443                 case MSG_TYPE_COMMAND:
 444                         resp.message_id = 0;
 445                         resp.data = mixart_msg_data;
 446                         resp.size = sizeof(mixart_msg_data);
 447                         err = get_msg(mgr, &resp, msg & ~MSG_TYPE_MASK);
 448                         if( err < 0 ) {
 449                                 snd_printk(KERN_ERR "interrupt: error(%d) reading mf %x\n", err, msg);
 450                                 break;
 451                         }
 452
 453                         if(resp.message_id == MSG_SERVICES_TIMER_NOTIFY) {
 454                                 int i;
 455                                 struct mixart_timer_notify *notify;
 456                                 notify = (struct mixart_timer_notify *)mixart_msg_data;
 457
 458                                 for(i=0; i<notify->stream_count; i++) {
 459
 460                                         u32 buffer_id = notify->streams[i].buffer_id;
 461                                         unsigned int chip_number =  (buffer_id & MIXART_NOTIFY_CARD_MASK) >> MIXART_NOTIFY_CARD_OFFSET; /* card0 to 3 */
 462                                         unsigned int pcm_number  =  (buffer_id & MIXART_NOTIFY_PCM_MASK ) >> MIXART_NOTIFY_PCM_OFFSET;  /* pcm0 to 3  */
 463                                         unsigned int sub_number  =   buffer_id & MIXART_NOTIFY_SUBS_MASK;             /* 0 to MIXART_PLAYBACK_STREAMS */
 464                                         unsigned int is_capture  = ((buffer_id & MIXART_NOTIFY_CAPT_MASK) != 0);      /* playback == 0 / capture == 1 */
 465
 466                                         struct snd_mixart *chip  = mgr->chip[chip_number];
 467                                         struct mixart_stream *stream;
 468
 469                                         if ((chip_number >= mgr->num_cards) || (pcm_number >= MIXART_PCM_TOTAL) || (sub_number >= MIXART_PLAYBACK_STREAMS)) {
 470                                                 snd_printk(KERN_ERR "error MSG_SERVICES_TIMER_NOTIFY buffer_id (%x) pos(%d)\n",
 471                                                            buffer_id, notify->streams[i].sample_pos_low_part);
 472                                                 break;
 473                                         }
 474
 475                                         if (is_capture)
 476                                                 stream = &chip->capture_stream[pcm_number];
 477                                         else
 478                                                 stream = &chip->playback_stream[pcm_number][sub_number];
 479
 480                                         if (stream->substream && (stream->status == MIXART_STREAM_STATUS_RUNNING)) {
 481                                                 struct snd_pcm_runtime *runtime = stream->substream->runtime;
 482                                                 int elapsed = 0;
 483                                                 u64 sample_count = ((u64)notify->streams[i].sample_pos_high_part) << 32;
 484                                                 sample_count |= notify->streams[i].sample_pos_low_part;
 485
 486                                                 while (1) {
 487                                                         u64 new_elapse_pos = stream->abs_period_elapsed +  runtime->period_size;
 488
 489                                                         if (new_elapse_pos > sample_count) {
 490                                                                 break; /* while */
 491                                                         }
 492                                                         else {
 493                                                                 elapsed = 1;
 494                                                                 stream->buf_periods++;
 495                                                                 if (stream->buf_periods >= runtime->periods)
 496                                                                         stream->buf_periods = 0;
 497
 498                                                                 stream->abs_period_elapsed = new_elapse_pos;
 499                                                         }
 500                                                 }
 501                                                 stream->buf_period_frag = (u32)( sample_count - stream->abs_period_elapsed );
 502
 503                                                 if(elapsed) {
 504                                                         spin_unlock(&mgr->lock);
 505                                                         snd_pcm_period_elapsed(stream->substream);
 506                                                         spin_lock(&mgr->lock);
 507                                                 }
 508                                         }
 509                                 }
 510                                 break;
 511                         }
 512                         if(resp.message_id == MSG_SERVICES_REPORT_TRACES) {
 513                                 if(resp.size > 1) {
 514 #ifndef __BIG_ENDIAN
 515                                         /* Traces are text: the swapped msg_data has to be swapped back ! */
 516                                         int i;
 517                                         for(i=0; i<(resp.size/4); i++) {
 518                                                 (mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);
 519                                         }
 520 #endif
 521                                         ((char*)mixart_msg_data)[resp.size - 1] = 0;
 522                                         snd_printdd("MIXART TRACE : %s\n", (char*)mixart_msg_data);
 523                                 }
 524                                 break;
 525                         }
 526
 527                         snd_printdd("command %x not handled\n", resp.message_id);
 528                         break;
 529
 530                 case MSG_TYPE_NOTIFY:
 531                         if(msg & MSG_CANCEL_NOTIFY_MASK) {
 532                                 msg &= ~MSG_CANCEL_NOTIFY_MASK;
 533                                 snd_printk(KERN_ERR "canceled notification %x !\n", msg);
 534                         }
 535                         /* no break, continue ! */
 536                 case MSG_TYPE_ANSWER:
 537                         /* answer or notification to a message we are waiting for*/
 538                         spin_lock(&mgr->msg_lock);
 539                         if( (msg & ~MSG_TYPE_MASK) == mgr->pending_event ) {
 540                                 wake_up(&mgr->msg_sleep);
 541                                 mgr->pending_event = 0;
 542                         }
 543                         /* answer to a message we did't want to wait for */
 544                         else {
 545                                 mgr->msg_fifo[mgr->msg_fifo_writeptr] = msg;
 546                                 mgr->msg_fifo_writeptr++;
 547                                 mgr->msg_fifo_writeptr %= MSG_FIFO_SIZE;
 548                                 tasklet_hi_schedule(&mgr->msg_taskq);
 549                         }
 550                         spin_unlock(&mgr->msg_lock);
 551                         break;
 552                 case MSG_TYPE_REQUEST:
 553                 default:
 554                         snd_printdd("interrupt received request %x\n", msg);
 555                         /* TODO : are there things to do here ? */
 556                         break;
 557                 } /* switch on msg type */
 558         } /* while there are msgs */
 559
 560         /* allow interrupt again */
 561         writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 562
 563         spin_unlock(&mgr->lock);
 564
 565         return IRQ_HANDLED;
 566 }
 567
 568
 569 void snd_mixart_init_mailbox(struct mixart_mgr *mgr)
 570 {
 571         writel( 0, MIXART_MEM( mgr, MSG_HOST_RSC_PROTECTION ) );
 572         writel( 0, MIXART_MEM( mgr, MSG_AGENT_RSC_PROTECTION ) );
 573
 574         /* allow outbound messagebox to generate interrupts */
 575         if(mgr->irq >= 0) {
 576                 writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 577         }
 578         return;
 579 }
 580
 581 void snd_mixart_exit_mailbox(struct mixart_mgr *mgr)
 582 {
 583         /* no more interrupts on outbound messagebox */
 584         writel_le( MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 585         return;
 586 }
 587
 588 void snd_mixart_reset_board(struct mixart_mgr *mgr)
 589 {
 590         /* reset miXart */
 591         writel_be( 1, MIXART_REG(mgr, MIXART_BA1_BRUTAL_RESET_OFFSET) );
 592         return;
 593 }