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         if (tailptr < MSG_OUTBOUND_POST_STACK)
  60                 return 0; /* error */
  61         if (tailptr >= MSG_OUTBOUND_POST_STACK + MSG_BOUND_STACK_SIZE)
  62                 return 0; /* error */
  63
  64         *msg_frame = readl_be(MIXART_MEM(mgr, tailptr));
  65
  66         /* increment the tail index */
  67         tailptr += 4;
  68         if( tailptr >= (MSG_OUTBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
  69                 tailptr = MSG_OUTBOUND_POST_STACK;
  70         writel_be(tailptr, MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
  71
  72         return 1;
  73 }
  74
  75 static int get_msg(struct mixart_mgr *mgr, struct mixart_msg *resp,
  76                    u32 msg_frame_address )
  77 {
  78         unsigned long flags;
  79         u32  headptr;
  80         u32  size;
  81         int  err;
  82 #ifndef __BIG_ENDIAN
  83         unsigned int i;
  84 #endif
  85
  86         spin_lock_irqsave(&mgr->msg_lock, flags);
  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                 snd_printk(KERN_ERR "problem with response size = %d\n", size);
  98                 goto _clean_exit;
  99         }
 100         size -= MSG_DESCRIPTOR_SIZE;
 101
 102         memcpy_fromio(resp->data, MIXART_MEM(mgr, msg_frame_address + MSG_HEADER_SIZE ), size);
 103         resp->size = size;
 104
 105         /* swap if necessary */
 106 #ifndef __BIG_ENDIAN
 107         size /= 4; /* u32 size */
 108         for(i=0; i < size; i++) {
 109                 ((u32*)resp->data)[i] = be32_to_cpu(((u32*)resp->data)[i]);
 110         }
 111 #endif
 112
 113         /*
 114          * free message frame address
 115          */
 116         headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 117
 118         if( (headptr < MSG_OUTBOUND_FREE_STACK) || ( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
 119                 err = -EINVAL;
 120                 goto _clean_exit;
 121         }
 122
 123         /* give address back to outbound fifo */
 124         writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
 125
 126         /* increment the outbound free head */
 127         headptr += 4;
 128         if( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
 129                 headptr = MSG_OUTBOUND_FREE_STACK;
 130
 131         writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 132
 133  _clean_exit:
 134         spin_unlock_irqrestore(&mgr->msg_lock, flags);
 135
 136         return err;
 137 }
 138
 139
 140 /*
 141  * send a message to miXart. return: the msg_frame used for this message
 142  */
 143 /* call with mgr->msg_lock held! */
 144 static int send_msg( struct mixart_mgr *mgr,
 145                      struct mixart_msg *msg,
 146                      int max_answersize,
 147                      int mark_pending,
 148                      u32 *msg_event)
 149 {
 150         u32 headptr, tailptr;
 151         u32 msg_frame_address;
 152         int err, i;
 153
 154         if (snd_BUG_ON(msg->size % 4))
 155                 return -EINVAL;
 156
 157         err = 0;
 158
 159         /* get message frame address */
 160         tailptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
 161         headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_HEAD));
 162
 163         if (tailptr == headptr) {
 164                 snd_printk(KERN_ERR "error: no message frame available\n");
 165                 return -EBUSY;
 166         }
 167
 168         if( (tailptr < MSG_INBOUND_FREE_STACK) || (tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
 169                 return -EINVAL;
 170         }
 171
 172         msg_frame_address = readl_be(MIXART_MEM(mgr, tailptr));
 173         writel(0, MIXART_MEM(mgr, tailptr)); /* set address to zero on this fifo position */
 174
 175         /* increment the inbound free tail */
 176         tailptr += 4;
 177         if( tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
 178                 tailptr = MSG_INBOUND_FREE_STACK;
 179
 180         writel_be(tailptr, MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
 181
 182         /* TODO : use memcpy_toio() with intermediate buffer to copy the message */
 183
 184         /* copy message descriptor to card memory */
 185         writel_be( msg->size + MSG_DESCRIPTOR_SIZE,      MIXART_MEM(mgr, msg_frame_address) );      /* size of descriptor + request */
 186         writel_be( msg->message_id ,                     MIXART_MEM(mgr, msg_frame_address + 4) );  /* dwMessageID */
 187         writel_be( msg->uid.object_id,                   MIXART_MEM(mgr, msg_frame_address + 8) );  /* uidDest */
 188         writel_be( msg->uid.desc,                        MIXART_MEM(mgr, msg_frame_address + 12) ); /* */
 189         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 16) ); /* SizeHeader */
 190         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 20) ); /* OffsetDLL_T16 */
 191         writel_be( msg->size,                            MIXART_MEM(mgr, msg_frame_address + 24) ); /* SizeDLL_T16 */
 192         writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 28) ); /* OffsetDLL_DRV */
 193         writel_be( 0,                                    MIXART_MEM(mgr, msg_frame_address + 32) ); /* SizeDLL_DRV */
 194         writel_be( MSG_DESCRIPTOR_SIZE + max_answersize, MIXART_MEM(mgr, msg_frame_address + 36) ); /* dwExpectedAnswerSize */
 195
 196         /* copy message data to card memory */
 197         for( i=0; i < msg->size; i+=4 ) {
 198                 writel_be( *(u32*)(msg->data + i), MIXART_MEM(mgr, MSG_HEADER_SIZE + msg_frame_address + i)  );
 199         }
 200
 201         if( mark_pending ) {
 202                 if( *msg_event ) {
 203                         /* the pending event is the notification we wait for ! */
 204                         mgr->pending_event = *msg_event;
 205                 }
 206                 else {
 207                         /* the pending event is the answer we wait for (same address than the request)! */
 208                         mgr->pending_event = msg_frame_address;
 209
 210                         /* copy address back to caller */
 211                         *msg_event = msg_frame_address;
 212                 }
 213         }
 214
 215         /* mark the frame as a request (will have an answer) */
 216         msg_frame_address |= MSG_TYPE_REQUEST;
 217
 218         /* post the frame */
 219         headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
 220
 221         if( (headptr < MSG_INBOUND_POST_STACK) || (headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE))) {
 222                 return -EINVAL;
 223         }
 224
 225         writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
 226
 227         /* increment the inbound post head */
 228         headptr += 4;
 229         if( headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
 230                 headptr = MSG_INBOUND_POST_STACK;
 231
 232         writel_be(headptr, MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
 233
 234         return 0;
 235 }
 236
 237
 238 int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int max_resp_size, void *resp_data)
 239 {
 240         struct mixart_msg resp;
 241         u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */
 242         int err;
 243         wait_queue_t wait;
 244         long timeout;
 245
 246         mutex_lock(&mgr->msg_mutex);
 247
 248         init_waitqueue_entry(&wait, current);
 249
 250         spin_lock_irq(&mgr->msg_lock);
 251         /* send the message */
 252         err = send_msg(mgr, request, max_resp_size, 1, &msg_frame);  /* send and mark the answer pending */
 253         if (err) {
 254                 spin_unlock_irq(&mgr->msg_lock);
 255                 mutex_unlock(&mgr->msg_mutex);
 256                 return err;
 257         }
 258
 259         set_current_state(TASK_UNINTERRUPTIBLE);
 260         add_wait_queue(&mgr->msg_sleep, &wait);
 261         spin_unlock_irq(&mgr->msg_lock);
 262         timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
 263         remove_wait_queue(&mgr->msg_sleep, &wait);
 264
 265         if (! timeout) {
 266                 /* error - no ack */
 267                 mutex_unlock(&mgr->msg_mutex);
 268                 snd_printk(KERN_ERR "error: no response on msg %x\n", msg_frame);
 269                 return -EIO;
 270         }
 271
 272         /* retrieve the answer into the same struct mixart_msg */
 273         resp.message_id = 0;
 274         resp.uid = (struct mixart_uid){0,0};
 275         resp.data = resp_data;
 276         resp.size = max_resp_size;
 277
 278         err = get_msg(mgr, &resp, msg_frame);
 279
 280         if( request->message_id != resp.message_id )
 281                 snd_printk(KERN_ERR "RESPONSE ERROR!\n");
 282
 283         mutex_unlock(&mgr->msg_mutex);
 284         return err;
 285 }
 286
 287
 288 int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
 289                                    struct mixart_msg *request, u32 notif_event)
 290 {
 291         int err;
 292         wait_queue_t wait;
 293         long timeout;
 294
 295         if (snd_BUG_ON(!notif_event))
 296                 return -EINVAL;
 297         if (snd_BUG_ON((notif_event & MSG_TYPE_MASK) != MSG_TYPE_NOTIFY))
 298                 return -EINVAL;
 299         if (snd_BUG_ON(notif_event & MSG_CANCEL_NOTIFY_MASK))
 300                 return -EINVAL;
 301
 302         mutex_lock(&mgr->msg_mutex);
 303
 304         init_waitqueue_entry(&wait, current);
 305
 306         spin_lock_irq(&mgr->msg_lock);
 307         /* send the message */
 308         err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event);  /* send and mark the notification event pending */
 309         if(err) {
 310                 spin_unlock_irq(&mgr->msg_lock);
 311                 mutex_unlock(&mgr->msg_mutex);
 312                 return err;
 313         }
 314
 315         set_current_state(TASK_UNINTERRUPTIBLE);
 316         add_wait_queue(&mgr->msg_sleep, &wait);
 317         spin_unlock_irq(&mgr->msg_lock);
 318         timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
 319         remove_wait_queue(&mgr->msg_sleep, &wait);
 320
 321         if (! timeout) {
 322                 /* error - no ack */
 323                 mutex_unlock(&mgr->msg_mutex);
 324                 snd_printk(KERN_ERR "error: notification %x not received\n", notif_event);
 325                 return -EIO;
 326         }
 327
 328         mutex_unlock(&mgr->msg_mutex);
 329         return 0;
 330 }
 331
 332
 333 int snd_mixart_send_msg_nonblock(struct mixart_mgr *mgr, struct mixart_msg *request)
 334 {
 335         u32 message_frame;
 336         unsigned long flags;
 337         int err;
 338
 339         /* just send the message (do not mark it as a pending one) */
 340         spin_lock_irqsave(&mgr->msg_lock, flags);
 341         err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);
 342         spin_unlock_irqrestore(&mgr->msg_lock, flags);
 343
 344         /* the answer will be handled by snd_struct mixart_msgasklet()  */
 345         atomic_inc(&mgr->msg_processed);
 346
 347         return err;
 348 }
 349
 350
 351 /* common buffer of tasklet and interrupt to send/receive messages */
 352 static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
 353
 354
 355 void snd_mixart_msg_tasklet(unsigned long arg)
 356 {
 357         struct mixart_mgr *mgr = ( struct mixart_mgr*)(arg);
 358         struct mixart_msg resp;
 359         u32 msg, addr, type;
 360         int err;
 361
 362         spin_lock(&mgr->lock);
 363
 364         while (mgr->msg_fifo_readptr != mgr->msg_fifo_writeptr) {
 365                 msg = mgr->msg_fifo[mgr->msg_fifo_readptr];
 366                 mgr->msg_fifo_readptr++;
 367                 mgr->msg_fifo_readptr %= MSG_FIFO_SIZE;
 368
 369                 /* process the message ... */
 370                 addr = msg & ~MSG_TYPE_MASK;
 371                 type = msg & MSG_TYPE_MASK;
 372
 373                 switch (type) {
 374                 case MSG_TYPE_ANSWER:
 375                         /* answer to a message on that we did not wait for (send_msg_nonblock) */
 376                         resp.message_id = 0;
 377                         resp.data = mixart_msg_data;
 378                         resp.size = sizeof(mixart_msg_data);
 379                         err = get_msg(mgr, &resp, addr);
 380                         if( err < 0 ) {
 381                                 snd_printk(KERN_ERR "tasklet: error(%d) reading mf %x\n", err, msg);
 382                                 break;
 383                         }
 384
 385                         switch(resp.message_id) {
 386                         case MSG_STREAM_START_INPUT_STAGE_PACKET:
 387                         case MSG_STREAM_START_OUTPUT_STAGE_PACKET:
 388                         case MSG_STREAM_STOP_INPUT_STAGE_PACKET:
 389                         case MSG_STREAM_STOP_OUTPUT_STAGE_PACKET:
 390                                 if(mixart_msg_data[0])
 391                                         snd_printk(KERN_ERR "tasklet : error MSG_STREAM_ST***_***PUT_STAGE_PACKET status=%x\n", mixart_msg_data[0]);
 392                                 break;
 393                         default:
 394                                 snd_printdd("tasklet received mf(%x) : msg_id(%x) uid(%x, %x) size(%zd)\n",
 395                                            msg, resp.message_id, resp.uid.object_id, resp.uid.desc, resp.size);
 396                                 break;
 397                         }
 398                         break;
 399                 case MSG_TYPE_NOTIFY:
 400                         /* msg contains no address ! do not get_msg() ! */
 401                 case MSG_TYPE_COMMAND:
 402                         /* get_msg() necessary */
 403                 default:
 404                         snd_printk(KERN_ERR "tasklet doesn't know what to do with message %x\n", msg);
 405                 } /* switch type */
 406
 407                 /* decrement counter */
 408                 atomic_dec(&mgr->msg_processed);
 409
 410         } /* while there is a msg in fifo */
 411
 412         spin_unlock(&mgr->lock);
 413 }
 414
 415
 416 irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
 417 {
 418         struct mixart_mgr *mgr = dev_id;
 419         int err;
 420         struct mixart_msg resp;
 421
 422         u32 msg;
 423         u32 it_reg;
 424
 425         spin_lock(&mgr->lock);
 426
 427         it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));
 428         if( !(it_reg & MIXART_OIDI) ) {
 429                 /* this device did not cause the interrupt */
 430                 spin_unlock(&mgr->lock);
 431                 return IRQ_NONE;
 432         }
 433
 434         /* mask all interrupts */
 435         writel_le(MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG(mgr, MIXART_PCI_OMIMR_OFFSET));
 436
 437         /* outdoorbell register clear */
 438         it_reg = readl(MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
 439         writel(it_reg, MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
 440
 441         /* clear interrupt */
 442         writel_le( MIXART_OIDI, MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET) );
 443
 444         /* process interrupt */
 445         while (retrieve_msg_frame(mgr, &msg)) {
 446
 447                 switch (msg & MSG_TYPE_MASK) {
 448                 case MSG_TYPE_COMMAND:
 449                         resp.message_id = 0;
 450                         resp.data = mixart_msg_data;
 451                         resp.size = sizeof(mixart_msg_data);
 452                         err = get_msg(mgr, &resp, msg & ~MSG_TYPE_MASK);
 453                         if( err < 0 ) {
 454                                 snd_printk(KERN_ERR "interrupt: error(%d) reading mf %x\n", err, msg);
 455                                 break;
 456                         }
 457
 458                         if(resp.message_id == MSG_SERVICES_TIMER_NOTIFY) {
 459                                 int i;
 460                                 struct mixart_timer_notify *notify;
 461                                 notify = (struct mixart_timer_notify *)mixart_msg_data;
 462
 463                                 for(i=0; i<notify->stream_count; i++) {
 464
 465                                         u32 buffer_id = notify->streams[i].buffer_id;
 466                                         unsigned int chip_number =  (buffer_id & MIXART_NOTIFY_CARD_MASK) >> MIXART_NOTIFY_CARD_OFFSET; /* card0 to 3 */
 467                                         unsigned int pcm_number  =  (buffer_id & MIXART_NOTIFY_PCM_MASK ) >> MIXART_NOTIFY_PCM_OFFSET;  /* pcm0 to 3  */
 468                                         unsigned int sub_number  =   buffer_id & MIXART_NOTIFY_SUBS_MASK;             /* 0 to MIXART_PLAYBACK_STREAMS */
 469                                         unsigned int is_capture  = ((buffer_id & MIXART_NOTIFY_CAPT_MASK) != 0);      /* playback == 0 / capture == 1 */
 470
 471                                         struct snd_mixart *chip  = mgr->chip[chip_number];
 472                                         struct mixart_stream *stream;
 473
 474                                         if ((chip_number >= mgr->num_cards) || (pcm_number >= MIXART_PCM_TOTAL) || (sub_number >= MIXART_PLAYBACK_STREAMS)) {
 475                                                 snd_printk(KERN_ERR "error MSG_SERVICES_TIMER_NOTIFY buffer_id (%x) pos(%d)\n",
 476                                                            buffer_id, notify->streams[i].sample_pos_low_part);
 477                                                 break;
 478                                         }
 479
 480                                         if (is_capture)
 481                                                 stream = &chip->capture_stream[pcm_number];
 482                                         else
 483                                                 stream = &chip->playback_stream[pcm_number][sub_number];
 484
 485                                         if (stream->substream && (stream->status == MIXART_STREAM_STATUS_RUNNING)) {
 486                                                 struct snd_pcm_runtime *runtime = stream->substream->runtime;
 487                                                 int elapsed = 0;
 488                                                 u64 sample_count = ((u64)notify->streams[i].sample_pos_high_part) << 32;
 489                                                 sample_count |= notify->streams[i].sample_pos_low_part;
 490
 491                                                 while (1) {
 492                                                         u64 new_elapse_pos = stream->abs_period_elapsed +  runtime->period_size;
 493
 494                                                         if (new_elapse_pos > sample_count) {
 495                                                                 break; /* while */
 496                                                         }
 497                                                         else {
 498                                                                 elapsed = 1;
 499                                                                 stream->buf_periods++;
 500                                                                 if (stream->buf_periods >= runtime->periods)
 501                                                                         stream->buf_periods = 0;
 502
 503                                                                 stream->abs_period_elapsed = new_elapse_pos;
 504                                                         }
 505                                                 }
 506                                                 stream->buf_period_frag = (u32)( sample_count - stream->abs_period_elapsed );
 507
 508                                                 if(elapsed) {
 509                                                         spin_unlock(&mgr->lock);
 510                                                         snd_pcm_period_elapsed(stream->substream);
 511                                                         spin_lock(&mgr->lock);
 512                                                 }
 513                                         }
 514                                 }
 515                                 break;
 516                         }
 517                         if(resp.message_id == MSG_SERVICES_REPORT_TRACES) {
 518                                 if(resp.size > 1) {
 519 #ifndef __BIG_ENDIAN
 520                                         /* Traces are text: the swapped msg_data has to be swapped back ! */
 521                                         int i;
 522                                         for(i=0; i<(resp.size/4); i++) {
 523                                                 (mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);
 524                                         }
 525 #endif
 526                                         ((char*)mixart_msg_data)[resp.size - 1] = 0;
 527                                         snd_printdd("MIXART TRACE : %s\n", (char*)mixart_msg_data);
 528                                 }
 529                                 break;
 530                         }
 531
 532                         snd_printdd("command %x not handled\n", resp.message_id);
 533                         break;
 534
 535                 case MSG_TYPE_NOTIFY:
 536                         if(msg & MSG_CANCEL_NOTIFY_MASK) {
 537                                 msg &= ~MSG_CANCEL_NOTIFY_MASK;
 538                                 snd_printk(KERN_ERR "canceled notification %x !\n", msg);
 539                         }
 540                         /* no break, continue ! */
 541                 case MSG_TYPE_ANSWER:
 542                         /* answer or notification to a message we are waiting for*/
 543                         spin_lock(&mgr->msg_lock);
 544                         if( (msg & ~MSG_TYPE_MASK) == mgr->pending_event ) {
 545                                 wake_up(&mgr->msg_sleep);
 546                                 mgr->pending_event = 0;
 547                         }
 548                         /* answer to a message we did't want to wait for */
 549                         else {
 550                                 mgr->msg_fifo[mgr->msg_fifo_writeptr] = msg;
 551                                 mgr->msg_fifo_writeptr++;
 552                                 mgr->msg_fifo_writeptr %= MSG_FIFO_SIZE;
 553                                 tasklet_schedule(&mgr->msg_taskq);
 554                         }
 555                         spin_unlock(&mgr->msg_lock);
 556                         break;
 557                 case MSG_TYPE_REQUEST:
 558                 default:
 559                         snd_printdd("interrupt received request %x\n", msg);
 560                         /* TODO : are there things to do here ? */
 561                         break;
 562                 } /* switch on msg type */
 563         } /* while there are msgs */
 564
 565         /* allow interrupt again */
 566         writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 567
 568         spin_unlock(&mgr->lock);
 569
 570         return IRQ_HANDLED;
 571 }
 572
 573
 574 void snd_mixart_init_mailbox(struct mixart_mgr *mgr)
 575 {
 576         writel( 0, MIXART_MEM( mgr, MSG_HOST_RSC_PROTECTION ) );
 577         writel( 0, MIXART_MEM( mgr, MSG_AGENT_RSC_PROTECTION ) );
 578
 579         /* allow outbound messagebox to generate interrupts */
 580         if(mgr->irq >= 0) {
 581                 writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 582         }
 583         return;
 584 }
 585
 586 void snd_mixart_exit_mailbox(struct mixart_mgr *mgr)
 587 {
 588         /* no more interrupts on outbound messagebox */
 589         writel_le( MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 590         return;
 591 }
 592
 593 void snd_mixart_reset_board(struct mixart_mgr *mgr)
 594 {
 595         /* reset miXart */
 596         writel_be( 1, MIXART_REG(mgr, MIXART_BA1_BRUTAL_RESET_OFFSET) );
 597         return;
 598 }