LXR linux/sound/pci/mixart/mixart

   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
  48static 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
  75static 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! */
 144static 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
 238int 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 reponse 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 "REPONSE ERROR!\n");
 282
 283        mutex_unlock(&mgr->msg_mutex);
 284        return err;
 285}
 286
 287
 288int 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
 333int 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 */
 352static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
 353
 354
 355void 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
 416irqreturn_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
 574void 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
 586void 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
 593void 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}
 599