LXR linux/sound/pci/mixart/mixart

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Driver for Digigram miXart soundcards
   4 *
   5 * low level interface with interrupt handling and mail box implementation
   6 *
   7 * Copyright (c) 2003 by Digigram <alsa@digigram.com>
   8 */
   9
  10#include <linux/interrupt.h>
  11#include <linux/mutex.h>
  12#include <linux/pci.h>
  13#include <linux/io.h>
  14
  15#include <sound/core.h>
  16#include "mixart.h"
  17#include "mixart_hwdep.h"
  18#include "mixart_core.h"
  19
  20
  21#define MSG_TIMEOUT_JIFFIES         (400 * HZ) / 1000 /* 400 ms */
  22
  23#define MSG_DESCRIPTOR_SIZE         0x24
  24#define MSG_HEADER_SIZE             (MSG_DESCRIPTOR_SIZE + 4)
  25
  26#define MSG_DEFAULT_SIZE            512
  27
  28#define MSG_TYPE_MASK               0x00000003    /* mask for following types */
  29#define MSG_TYPE_NOTIFY             0             /* embedded -> driver (only notification, do not get_msg() !) */
  30#define MSG_TYPE_COMMAND            1             /* driver <-> embedded (a command has no answer) */
  31#define MSG_TYPE_REQUEST            2             /* driver -> embedded (request will get an answer back) */
  32#define MSG_TYPE_ANSWER             3             /* embedded -> driver */
  33#define MSG_CANCEL_NOTIFY_MASK      0x80000000    /* this bit is set for a notification that has been canceled */
  34
  35
  36static int retrieve_msg_frame(struct mixart_mgr *mgr, u32 *msg_frame)
  37{
  38        /* read the message frame fifo */
  39        u32 headptr, tailptr;
  40
  41        tailptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
  42        headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_HEAD));
  43
  44        if (tailptr == headptr)
  45                return 0; /* no message posted */
  46
  47        if (tailptr < MSG_OUTBOUND_POST_STACK)
  48                return 0; /* error */
  49        if (tailptr >= MSG_OUTBOUND_POST_STACK + MSG_BOUND_STACK_SIZE)
  50                return 0; /* error */
  51
  52        *msg_frame = readl_be(MIXART_MEM(mgr, tailptr));
  53
  54        /* increment the tail index */
  55        tailptr += 4;
  56        if( tailptr >= (MSG_OUTBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
  57                tailptr = MSG_OUTBOUND_POST_STACK;
  58        writel_be(tailptr, MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
  59
  60        return 1;
  61}
  62
  63static int get_msg(struct mixart_mgr *mgr, struct mixart_msg *resp,
  64                   u32 msg_frame_address )
  65{
  66        u32  headptr;
  67        u32  size;
  68        int  err;
  69#ifndef __BIG_ENDIAN
  70        unsigned int i;
  71#endif
  72
  73        mutex_lock(&mgr->msg_lock);
  74        err = 0;
  75
  76        /* copy message descriptor from miXart to driver */
  77        size                =  readl_be(MIXART_MEM(mgr, msg_frame_address));       /* size of descriptor + response */
  78        resp->message_id    =  readl_be(MIXART_MEM(mgr, msg_frame_address + 4));   /* dwMessageID */
  79        resp->uid.object_id =  readl_be(MIXART_MEM(mgr, msg_frame_address + 8));   /* uidDest */
  80        resp->uid.desc      =  readl_be(MIXART_MEM(mgr, msg_frame_address + 12));  /* */
  81
  82        if( (size < MSG_DESCRIPTOR_SIZE) || (resp->size < (size - MSG_DESCRIPTOR_SIZE))) {
  83                err = -EINVAL;
  84                dev_err(&mgr->pci->dev,
  85                        "problem with response size = %d\n", size);
  86                goto _clean_exit;
  87        }
  88        size -= MSG_DESCRIPTOR_SIZE;
  89
  90        memcpy_fromio(resp->data, MIXART_MEM(mgr, msg_frame_address + MSG_HEADER_SIZE ), size);
  91        resp->size = size;
  92
  93        /* swap if necessary */
  94#ifndef __BIG_ENDIAN
  95        size /= 4; /* u32 size */
  96        for(i=0; i < size; i++) {
  97                ((u32*)resp->data)[i] = be32_to_cpu(((__be32*)resp->data)[i]);
  98        }
  99#endif
 100
 101        /*
 102         * free message frame address
 103         */
 104        headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 105
 106        if( (headptr < MSG_OUTBOUND_FREE_STACK) || ( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
 107                err = -EINVAL;
 108                goto _clean_exit;
 109        }
 110
 111        /* give address back to outbound fifo */
 112        writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
 113
 114        /* increment the outbound free head */
 115        headptr += 4;
 116        if( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
 117                headptr = MSG_OUTBOUND_FREE_STACK;
 118
 119        writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 120
 121 _clean_exit:
 122        mutex_unlock(&mgr->msg_lock);
 123
 124        return err;
 125}
 126
 127
 128/*
 129 * send a message to miXart. return: the msg_frame used for this message
 130 */
 131/* call with mgr->msg_lock held! */
 132static int send_msg( struct mixart_mgr *mgr,
 133                     struct mixart_msg *msg,
 134                     int max_answersize,
 135                     int mark_pending,
 136                     u32 *msg_event)
 137{
 138        u32 headptr, tailptr;
 139        u32 msg_frame_address;
 140        int i;
 141
 142        if (snd_BUG_ON(msg->size % 4))
 143                return -EINVAL;
 144
 145        /* get message frame address */
 146        tailptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
 147        headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_HEAD));
 148
 149        if (tailptr == headptr) {
 150                dev_err(&mgr->pci->dev, "error: no message frame available\n");
 151                return -EBUSY;
 152        }
 153
 154        if( (tailptr < MSG_INBOUND_FREE_STACK) || (tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
 155                return -EINVAL;
 156        }
 157
 158        msg_frame_address = readl_be(MIXART_MEM(mgr, tailptr));
 159        writel(0, MIXART_MEM(mgr, tailptr)); /* set address to zero on this fifo position */
 160
 161        /* increment the inbound free tail */
 162        tailptr += 4;
 163        if( tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
 164                tailptr = MSG_INBOUND_FREE_STACK;
 165
 166        writel_be(tailptr, MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
 167
 168        /* TODO : use memcpy_toio() with intermediate buffer to copy the message */
 169
 170        /* copy message descriptor to card memory */
 171        writel_be( msg->size + MSG_DESCRIPTOR_SIZE,      MIXART_MEM(mgr, msg_frame_address) );      /* size of descriptor + request */
 172        writel_be( msg->message_id ,                     MIXART_MEM(mgr, msg_frame_address + 4) );  /* dwMessageID */
 173        writel_be( msg->uid.object_id,                   MIXART_MEM(mgr, msg_frame_address + 8) );  /* uidDest */
 174        writel_be( msg->uid.desc,                        MIXART_MEM(mgr, msg_frame_address + 12) ); /* */
 175        writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 16) ); /* SizeHeader */
 176        writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 20) ); /* OffsetDLL_T16 */
 177        writel_be( msg->size,                            MIXART_MEM(mgr, msg_frame_address + 24) ); /* SizeDLL_T16 */
 178        writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 28) ); /* OffsetDLL_DRV */
 179        writel_be( 0,                                    MIXART_MEM(mgr, msg_frame_address + 32) ); /* SizeDLL_DRV */
 180        writel_be( MSG_DESCRIPTOR_SIZE + max_answersize, MIXART_MEM(mgr, msg_frame_address + 36) ); /* dwExpectedAnswerSize */
 181
 182        /* copy message data to card memory */
 183        for( i=0; i < msg->size; i+=4 ) {
 184                writel_be( *(u32*)(msg->data + i), MIXART_MEM(mgr, MSG_HEADER_SIZE + msg_frame_address + i)  );
 185        }
 186
 187        if( mark_pending ) {
 188                if( *msg_event ) {
 189                        /* the pending event is the notification we wait for ! */
 190                        mgr->pending_event = *msg_event;
 191                }
 192                else {
 193                        /* the pending event is the answer we wait for (same address than the request)! */
 194                        mgr->pending_event = msg_frame_address;
 195
 196                        /* copy address back to caller */
 197                        *msg_event = msg_frame_address;
 198                }
 199        }
 200
 201        /* mark the frame as a request (will have an answer) */
 202        msg_frame_address |= MSG_TYPE_REQUEST;
 203
 204        /* post the frame */
 205        headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
 206
 207        if( (headptr < MSG_INBOUND_POST_STACK) || (headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE))) {
 208                return -EINVAL;
 209        }
 210
 211        writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
 212
 213        /* increment the inbound post head */
 214        headptr += 4;
 215        if( headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
 216                headptr = MSG_INBOUND_POST_STACK;
 217
 218        writel_be(headptr, MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
 219
 220        return 0;
 221}
 222
 223
 224int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int max_resp_size, void *resp_data)
 225{
 226        struct mixart_msg resp;
 227        u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */
 228        int err;
 229        wait_queue_entry_t wait;
 230        long timeout;
 231
 232        init_waitqueue_entry(&wait, current);
 233
 234        mutex_lock(&mgr->msg_lock);
 235        /* send the message */
 236        err = send_msg(mgr, request, max_resp_size, 1, &msg_frame);  /* send and mark the answer pending */
 237        if (err) {
 238                mutex_unlock(&mgr->msg_lock);
 239                return err;
 240        }
 241
 242        set_current_state(TASK_UNINTERRUPTIBLE);
 243        add_wait_queue(&mgr->msg_sleep, &wait);
 244        mutex_unlock(&mgr->msg_lock);
 245        timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
 246        remove_wait_queue(&mgr->msg_sleep, &wait);
 247
 248        if (! timeout) {
 249                /* error - no ack */
 250                dev_err(&mgr->pci->dev,
 251                        "error: no response on msg %x\n", msg_frame);
 252                return -EIO;
 253        }
 254
 255        /* retrieve the answer into the same struct mixart_msg */
 256        resp.message_id = 0;
 257        resp.uid = (struct mixart_uid){0,0};
 258        resp.data = resp_data;
 259        resp.size = max_resp_size;
 260
 261        err = get_msg(mgr, &resp, msg_frame);
 262
 263        if( request->message_id != resp.message_id )
 264                dev_err(&mgr->pci->dev, "RESPONSE ERROR!\n");
 265
 266        return err;
 267}
 268
 269
 270int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
 271                                   struct mixart_msg *request, u32 notif_event)
 272{
 273        int err;
 274        wait_queue_entry_t wait;
 275        long timeout;
 276
 277        if (snd_BUG_ON(!notif_event))
 278                return -EINVAL;
 279        if (snd_BUG_ON((notif_event & MSG_TYPE_MASK) != MSG_TYPE_NOTIFY))
 280                return -EINVAL;
 281        if (snd_BUG_ON(notif_event & MSG_CANCEL_NOTIFY_MASK))
 282                return -EINVAL;
 283
 284        init_waitqueue_entry(&wait, current);
 285
 286        mutex_lock(&mgr->msg_lock);
 287        /* send the message */
 288        err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event);  /* send and mark the notification event pending */
 289        if(err) {
 290                mutex_unlock(&mgr->msg_lock);
 291                return err;
 292        }
 293
 294        set_current_state(TASK_UNINTERRUPTIBLE);
 295        add_wait_queue(&mgr->msg_sleep, &wait);
 296        mutex_unlock(&mgr->msg_lock);
 297        timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
 298        remove_wait_queue(&mgr->msg_sleep, &wait);
 299
 300        if (! timeout) {
 301                /* error - no ack */
 302                dev_err(&mgr->pci->dev,
 303                        "error: notification %x not received\n", notif_event);
 304                return -EIO;
 305        }
 306
 307        return 0;
 308}
 309
 310
 311int snd_mixart_send_msg_nonblock(struct mixart_mgr *mgr, struct mixart_msg *request)
 312{
 313        u32 message_frame;
 314        int err;
 315
 316        /* just send the message (do not mark it as a pending one) */
 317        mutex_lock(&mgr->msg_lock);
 318        err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);
 319        mutex_unlock(&mgr->msg_lock);
 320
 321        /* the answer will be handled by snd_struct mixart_msgasklet()  */
 322        atomic_inc(&mgr->msg_processed);
 323
 324        return err;
 325}
 326
 327
 328/* common buffer of interrupt to send/receive messages */
 329static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
 330
 331
 332static void snd_mixart_process_msg(struct mixart_mgr *mgr)
 333{
 334        struct mixart_msg resp;
 335        u32 msg, addr, type;
 336        int err;
 337
 338        while (mgr->msg_fifo_readptr != mgr->msg_fifo_writeptr) {
 339                msg = mgr->msg_fifo[mgr->msg_fifo_readptr];
 340                mgr->msg_fifo_readptr++;
 341                mgr->msg_fifo_readptr %= MSG_FIFO_SIZE;
 342
 343                /* process the message ... */
 344                addr = msg & ~MSG_TYPE_MASK;
 345                type = msg & MSG_TYPE_MASK;
 346
 347                switch (type) {
 348                case MSG_TYPE_ANSWER:
 349                        /* answer to a message on that we did not wait for (send_msg_nonblock) */
 350                        resp.message_id = 0;
 351                        resp.data = mixart_msg_data;
 352                        resp.size = sizeof(mixart_msg_data);
 353                        err = get_msg(mgr, &resp, addr);
 354                        if( err < 0 ) {
 355                                dev_err(&mgr->pci->dev,
 356                                        "error(%d) reading mf %x\n",
 357                                        err, msg);
 358                                break;
 359                        }
 360
 361                        switch(resp.message_id) {
 362                        case MSG_STREAM_START_INPUT_STAGE_PACKET:
 363                        case MSG_STREAM_START_OUTPUT_STAGE_PACKET:
 364                        case MSG_STREAM_STOP_INPUT_STAGE_PACKET:
 365                        case MSG_STREAM_STOP_OUTPUT_STAGE_PACKET:
 366                                if(mixart_msg_data[0])
 367                                        dev_err(&mgr->pci->dev,
 368                                                "error MSG_STREAM_ST***_***PUT_STAGE_PACKET status=%x\n",
 369                                                mixart_msg_data[0]);
 370                                break;
 371                        default:
 372                                dev_dbg(&mgr->pci->dev,
 373                                        "received mf(%x) : msg_id(%x) uid(%x, %x) size(%zd)\n",
 374                                           msg, resp.message_id, resp.uid.object_id, resp.uid.desc, resp.size);
 375                                break;
 376                        }
 377                        break;
 378                case MSG_TYPE_NOTIFY:
 379                        /* msg contains no address ! do not get_msg() ! */
 380                case MSG_TYPE_COMMAND:
 381                        /* get_msg() necessary */
 382                default:
 383                        dev_err(&mgr->pci->dev,
 384                                "doesn't know what to do with message %x\n",
 385                                msg);
 386                } /* switch type */
 387
 388                /* decrement counter */
 389                atomic_dec(&mgr->msg_processed);
 390
 391        } /* while there is a msg in fifo */
 392}
 393
 394
 395irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
 396{
 397        struct mixart_mgr *mgr = dev_id;
 398        u32 it_reg;
 399
 400        it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));
 401        if( !(it_reg & MIXART_OIDI) ) {
 402                /* this device did not cause the interrupt */
 403                return IRQ_NONE;
 404        }
 405
 406        /* mask all interrupts */
 407        writel_le(MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG(mgr, MIXART_PCI_OMIMR_OFFSET));
 408
 409        /* outdoorbell register clear */
 410        it_reg = readl(MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
 411        writel(it_reg, MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
 412
 413        /* clear interrupt */
 414        writel_le( MIXART_OIDI, MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET) );
 415
 416        return IRQ_WAKE_THREAD;
 417}
 418
 419irqreturn_t snd_mixart_threaded_irq(int irq, void *dev_id)
 420{
 421        struct mixart_mgr *mgr = dev_id;
 422        int err;
 423        struct mixart_msg resp;
 424        u32 msg;
 425
 426        mutex_lock(&mgr->lock);
 427        /* process interrupt */
 428        while (retrieve_msg_frame(mgr, &msg)) {
 429
 430                switch (msg & MSG_TYPE_MASK) {
 431                case MSG_TYPE_COMMAND:
 432                        resp.message_id = 0;
 433                        resp.data = mixart_msg_data;
 434                        resp.size = sizeof(mixart_msg_data);
 435                        err = get_msg(mgr, &resp, msg & ~MSG_TYPE_MASK);
 436                        if( err < 0 ) {
 437                                dev_err(&mgr->pci->dev,
 438                                        "interrupt: error(%d) reading mf %x\n",
 439                                        err, msg);
 440                                break;
 441                        }
 442
 443                        if(resp.message_id == MSG_SERVICES_TIMER_NOTIFY) {
 444                                int i;
 445                                struct mixart_timer_notify *notify;
 446                                notify = (struct mixart_timer_notify *)mixart_msg_data;
 447
 448                                for(i=0; i<notify->stream_count; i++) {
 449
 450                                        u32 buffer_id = notify->streams[i].buffer_id;
 451                                        unsigned int chip_number =  (buffer_id & MIXART_NOTIFY_CARD_MASK) >> MIXART_NOTIFY_CARD_OFFSET; /* card0 to 3 */
 452                                        unsigned int pcm_number  =  (buffer_id & MIXART_NOTIFY_PCM_MASK ) >> MIXART_NOTIFY_PCM_OFFSET;  /* pcm0 to 3  */
 453                                        unsigned int sub_number  =   buffer_id & MIXART_NOTIFY_SUBS_MASK;             /* 0 to MIXART_PLAYBACK_STREAMS */
 454                                        unsigned int is_capture  = ((buffer_id & MIXART_NOTIFY_CAPT_MASK) != 0);      /* playback == 0 / capture == 1 */
 455
 456                                        struct snd_mixart *chip  = mgr->chip[chip_number];
 457                                        struct mixart_stream *stream;
 458
 459                                        if ((chip_number >= mgr->num_cards) || (pcm_number >= MIXART_PCM_TOTAL) || (sub_number >= MIXART_PLAYBACK_STREAMS)) {
 460                                                dev_err(&mgr->pci->dev,
 461                                                        "error MSG_SERVICES_TIMER_NOTIFY buffer_id (%x) pos(%d)\n",
 462                                                           buffer_id, notify->streams[i].sample_pos_low_part);
 463                                                break;
 464                                        }
 465
 466                                        if (is_capture)
 467                                                stream = &chip->capture_stream[pcm_number];
 468                                        else
 469                                                stream = &chip->playback_stream[pcm_number][sub_number];
 470
 471                                        if (stream->substream && (stream->status == MIXART_STREAM_STATUS_RUNNING)) {
 472                                                struct snd_pcm_runtime *runtime = stream->substream->runtime;
 473                                                int elapsed = 0;
 474                                                u64 sample_count = ((u64)notify->streams[i].sample_pos_high_part) << 32;
 475                                                sample_count |= notify->streams[i].sample_pos_low_part;
 476
 477                                                while (1) {
 478                                                        u64 new_elapse_pos = stream->abs_period_elapsed +  runtime->period_size;
 479
 480                                                        if (new_elapse_pos > sample_count) {
 481                                                                break; /* while */
 482                                                        }
 483                                                        else {
 484                                                                elapsed = 1;
 485                                                                stream->buf_periods++;
 486                                                                if (stream->buf_periods >= runtime->periods)
 487                                                                        stream->buf_periods = 0;
 488
 489                                                                stream->abs_period_elapsed = new_elapse_pos;
 490                                                        }
 491                                                }
 492                                                stream->buf_period_frag = (u32)( sample_count - stream->abs_period_elapsed );
 493
 494                                                if(elapsed) {
 495                                                        mutex_unlock(&mgr->lock);
 496                                                        snd_pcm_period_elapsed(stream->substream);
 497                                                        mutex_lock(&mgr->lock);
 498                                                }
 499                                        }
 500                                }
 501                                break;
 502                        }
 503                        if(resp.message_id == MSG_SERVICES_REPORT_TRACES) {
 504                                if(resp.size > 1) {
 505#ifndef __BIG_ENDIAN
 506                                        /* Traces are text: the swapped msg_data has to be swapped back ! */
 507                                        int i;
 508                                        for(i=0; i<(resp.size/4); i++) {
 509                                                ((__be32*)mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);
 510                                        }
 511#endif
 512                                        ((char*)mixart_msg_data)[resp.size - 1] = 0;
 513                                        dev_dbg(&mgr->pci->dev,
 514                                                "MIXART TRACE : %s\n",
 515                                                (char *)mixart_msg_data);
 516                                }
 517                                break;
 518                        }
 519
 520                        dev_dbg(&mgr->pci->dev, "command %x not handled\n",
 521                                resp.message_id);
 522                        break;
 523
 524                case MSG_TYPE_NOTIFY:
 525                        if(msg & MSG_CANCEL_NOTIFY_MASK) {
 526                                msg &= ~MSG_CANCEL_NOTIFY_MASK;
 527                                dev_err(&mgr->pci->dev,
 528                                        "canceled notification %x !\n", msg);
 529                        }
 530                        /* fall through */
 531                case MSG_TYPE_ANSWER:
 532                        /* answer or notification to a message we are waiting for*/
 533                        mutex_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                                snd_mixart_process_msg(mgr);
 544                        }
 545                        mutex_unlock(&mgr->msg_lock);
 546                        break;
 547                case MSG_TYPE_REQUEST:
 548                default:
 549                        dev_dbg(&mgr->pci->dev,
 550                                "interrupt received request %x\n", msg);
 551                        /* TODO : are there things to do here ? */
 552                        break;
 553                } /* switch on msg type */
 554        } /* while there are msgs */
 555
 556        /* allow interrupt again */
 557        writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 558
 559        mutex_unlock(&mgr->lock);
 560
 561        return IRQ_HANDLED;
 562}
 563
 564
 565void snd_mixart_init_mailbox(struct mixart_mgr *mgr)
 566{
 567        writel( 0, MIXART_MEM( mgr, MSG_HOST_RSC_PROTECTION ) );
 568        writel( 0, MIXART_MEM( mgr, MSG_AGENT_RSC_PROTECTION ) );
 569
 570        /* allow outbound messagebox to generate interrupts */
 571        if(mgr->irq >= 0) {
 572                writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 573        }
 574        return;
 575}
 576
 577void snd_mixart_exit_mailbox(struct mixart_mgr *mgr)
 578{
 579        /* no more interrupts on outbound messagebox */
 580        writel_le( MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 581        return;
 582}
 583
 584void snd_mixart_reset_board(struct mixart_mgr *mgr)
 585{
 586        /* reset miXart */
 587        writel_be( 1, MIXART_REG(mgr, MIXART_BA1_BRUTAL_RESET_OFFSET) );
 588        return;
 589}
 590