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