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        err = 0;
  74
  75        /* copy message descriptor from miXart to driver */
  76        size                =  readl_be(MIXART_MEM(mgr, msg_frame_address));       /* size of descriptor + response */
  77        resp->message_id    =  readl_be(MIXART_MEM(mgr, msg_frame_address + 4));   /* dwMessageID */
  78        resp->uid.object_id =  readl_be(MIXART_MEM(mgr, msg_frame_address + 8));   /* uidDest */
  79        resp->uid.desc      =  readl_be(MIXART_MEM(mgr, msg_frame_address + 12));  /* */
  80
  81        if( (size < MSG_DESCRIPTOR_SIZE) || (resp->size < (size - MSG_DESCRIPTOR_SIZE))) {
  82                err = -EINVAL;
  83                dev_err(&mgr->pci->dev,
  84                        "problem with response size = %d\n", size);
  85                goto _clean_exit;
  86        }
  87        size -= MSG_DESCRIPTOR_SIZE;
  88
  89        memcpy_fromio(resp->data, MIXART_MEM(mgr, msg_frame_address + MSG_HEADER_SIZE ), size);
  90        resp->size = size;
  91
  92        /* swap if necessary */
  93#ifndef __BIG_ENDIAN
  94        size /= 4; /* u32 size */
  95        for(i=0; i < size; i++) {
  96                ((u32*)resp->data)[i] = be32_to_cpu(((__be32*)resp->data)[i]);
  97        }
  98#endif
  99
 100        /*
 101         * free message frame address
 102         */
 103        headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 104
 105        if( (headptr < MSG_OUTBOUND_FREE_STACK) || ( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
 106                err = -EINVAL;
 107                goto _clean_exit;
 108        }
 109
 110        /* give address back to outbound fifo */
 111        writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
 112
 113        /* increment the outbound free head */
 114        headptr += 4;
 115        if( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
 116                headptr = MSG_OUTBOUND_FREE_STACK;
 117
 118        writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 119
 120 _clean_exit:
 121        return err;
 122}
 123
 124
 125/*
 126 * send a message to miXart. return: the msg_frame used for this message
 127 */
 128/* call with mgr->msg_lock held! */
 129static int send_msg( struct mixart_mgr *mgr,
 130                     struct mixart_msg *msg,
 131                     int max_answersize,
 132                     int mark_pending,
 133                     u32 *msg_event)
 134{
 135        u32 headptr, tailptr;
 136        u32 msg_frame_address;
 137        int i;
 138
 139        if (snd_BUG_ON(msg->size % 4))
 140                return -EINVAL;
 141
 142        /* get message frame address */
 143        tailptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
 144        headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_HEAD));
 145
 146        if (tailptr == headptr) {
 147                dev_err(&mgr->pci->dev, "error: no message frame available\n");
 148                return -EBUSY;
 149        }
 150
 151        if( (tailptr < MSG_INBOUND_FREE_STACK) || (tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
 152                return -EINVAL;
 153        }
 154
 155        msg_frame_address = readl_be(MIXART_MEM(mgr, tailptr));
 156        writel(0, MIXART_MEM(mgr, tailptr)); /* set address to zero on this fifo position */
 157
 158        /* increment the inbound free tail */
 159        tailptr += 4;
 160        if( tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
 161                tailptr = MSG_INBOUND_FREE_STACK;
 162
 163        writel_be(tailptr, MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
 164
 165        /* TODO : use memcpy_toio() with intermediate buffer to copy the message */
 166
 167        /* copy message descriptor to card memory */
 168        writel_be( msg->size + MSG_DESCRIPTOR_SIZE,      MIXART_MEM(mgr, msg_frame_address) );      /* size of descriptor + request */
 169        writel_be( msg->message_id ,                     MIXART_MEM(mgr, msg_frame_address + 4) );  /* dwMessageID */
 170        writel_be( msg->uid.object_id,                   MIXART_MEM(mgr, msg_frame_address + 8) );  /* uidDest */
 171        writel_be( msg->uid.desc,                        MIXART_MEM(mgr, msg_frame_address + 12) ); /* */
 172        writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 16) ); /* SizeHeader */
 173        writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 20) ); /* OffsetDLL_T16 */
 174        writel_be( msg->size,                            MIXART_MEM(mgr, msg_frame_address + 24) ); /* SizeDLL_T16 */
 175        writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 28) ); /* OffsetDLL_DRV */
 176        writel_be( 0,                                    MIXART_MEM(mgr, msg_frame_address + 32) ); /* SizeDLL_DRV */
 177        writel_be( MSG_DESCRIPTOR_SIZE + max_answersize, MIXART_MEM(mgr, msg_frame_address + 36) ); /* dwExpectedAnswerSize */
 178
 179        /* copy message data to card memory */
 180        for( i=0; i < msg->size; i+=4 ) {
 181                writel_be( *(u32*)(msg->data + i), MIXART_MEM(mgr, MSG_HEADER_SIZE + msg_frame_address + i)  );
 182        }
 183
 184        if( mark_pending ) {
 185                if( *msg_event ) {
 186                        /* the pending event is the notification we wait for ! */
 187                        mgr->pending_event = *msg_event;
 188                }
 189                else {
 190                        /* the pending event is the answer we wait for (same address than the request)! */
 191                        mgr->pending_event = msg_frame_address;
 192
 193                        /* copy address back to caller */
 194                        *msg_event = msg_frame_address;
 195                }
 196        }
 197
 198        /* mark the frame as a request (will have an answer) */
 199        msg_frame_address |= MSG_TYPE_REQUEST;
 200
 201        /* post the frame */
 202        headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
 203
 204        if( (headptr < MSG_INBOUND_POST_STACK) || (headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE))) {
 205                return -EINVAL;
 206        }
 207
 208        writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
 209
 210        /* increment the inbound post head */
 211        headptr += 4;
 212        if( headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
 213                headptr = MSG_INBOUND_POST_STACK;
 214
 215        writel_be(headptr, MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
 216
 217        return 0;
 218}
 219
 220
 221int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int max_resp_size, void *resp_data)
 222{
 223        struct mixart_msg resp;
 224        u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */
 225        int err;
 226        wait_queue_entry_t wait;
 227        long timeout;
 228
 229        init_waitqueue_entry(&wait, current);
 230
 231        mutex_lock(&mgr->msg_lock);
 232        /* send the message */
 233        err = send_msg(mgr, request, max_resp_size, 1, &msg_frame);  /* send and mark the answer pending */
 234        if (err) {
 235                mutex_unlock(&mgr->msg_lock);
 236                return err;
 237        }
 238
 239        set_current_state(TASK_UNINTERRUPTIBLE);
 240        add_wait_queue(&mgr->msg_sleep, &wait);
 241        mutex_unlock(&mgr->msg_lock);
 242        timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
 243        remove_wait_queue(&mgr->msg_sleep, &wait);
 244
 245        if (! timeout) {
 246                /* error - no ack */
 247                dev_err(&mgr->pci->dev,
 248                        "error: no response on msg %x\n", msg_frame);
 249                return -EIO;
 250        }
 251
 252        /* retrieve the answer into the same struct mixart_msg */
 253        resp.message_id = 0;
 254        resp.uid = (struct mixart_uid){0,0};
 255        resp.data = resp_data;
 256        resp.size = max_resp_size;
 257
 258        mutex_lock(&mgr->msg_lock);
 259        err = get_msg(mgr, &resp, msg_frame);
 260        mutex_unlock(&mgr->msg_lock);
 261
 262        if( request->message_id != resp.message_id )
 263                dev_err(&mgr->pci->dev, "RESPONSE ERROR!\n");
 264
 265        return err;
 266}
 267
 268
 269int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
 270                                   struct mixart_msg *request, u32 notif_event)
 271{
 272        int err;
 273        wait_queue_entry_t wait;
 274        long timeout;
 275
 276        if (snd_BUG_ON(!notif_event))
 277                return -EINVAL;
 278        if (snd_BUG_ON((notif_event & MSG_TYPE_MASK) != MSG_TYPE_NOTIFY))
 279                return -EINVAL;
 280        if (snd_BUG_ON(notif_event & MSG_CANCEL_NOTIFY_MASK))
 281                return -EINVAL;
 282
 283        init_waitqueue_entry(&wait, current);
 284
 285        mutex_lock(&mgr->msg_lock);
 286        /* send the message */
 287        err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event);  /* send and mark the notification event pending */
 288        if(err) {
 289                mutex_unlock(&mgr->msg_lock);
 290                return err;
 291        }
 292
 293        set_current_state(TASK_UNINTERRUPTIBLE);
 294        add_wait_queue(&mgr->msg_sleep, &wait);
 295        mutex_unlock(&mgr->msg_lock);
 296        timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
 297        remove_wait_queue(&mgr->msg_sleep, &wait);
 298
 299        if (! timeout) {
 300                /* error - no ack */
 301                dev_err(&mgr->pci->dev,
 302                        "error: notification %x not received\n", notif_event);
 303                return -EIO;
 304        }
 305
 306        return 0;
 307}
 308
 309
 310int snd_mixart_send_msg_nonblock(struct mixart_mgr *mgr, struct mixart_msg *request)
 311{
 312        u32 message_frame;
 313        int err;
 314
 315        /* just send the message (do not mark it as a pending one) */
 316        mutex_lock(&mgr->msg_lock);
 317        err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);
 318        mutex_unlock(&mgr->msg_lock);
 319
 320        /* the answer will be handled by snd_struct mixart_msgasklet()  */
 321        atomic_inc(&mgr->msg_processed);
 322
 323        return err;
 324}
 325
 326
 327/* common buffer of interrupt to send/receive messages */
 328static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
 329
 330
 331static void snd_mixart_process_msg(struct mixart_mgr *mgr)
 332{
 333        struct mixart_msg resp;
 334        u32 msg, addr, type;
 335        int err;
 336
 337        while (mgr->msg_fifo_readptr != mgr->msg_fifo_writeptr) {
 338                msg = mgr->msg_fifo[mgr->msg_fifo_readptr];
 339                mgr->msg_fifo_readptr++;
 340                mgr->msg_fifo_readptr %= MSG_FIFO_SIZE;
 341
 342                /* process the message ... */
 343                addr = msg & ~MSG_TYPE_MASK;
 344                type = msg & MSG_TYPE_MASK;
 345
 346                switch (type) {
 347                case MSG_TYPE_ANSWER:
 348                        /* answer to a message on that we did not wait for (send_msg_nonblock) */
 349                        resp.message_id = 0;
 350                        resp.data = mixart_msg_data;
 351                        resp.size = sizeof(mixart_msg_data);
 352                        err = get_msg(mgr, &resp, addr);
 353                        if( err < 0 ) {
 354                                dev_err(&mgr->pci->dev,
 355                                        "error(%d) reading mf %x\n",
 356                                        err, msg);
 357                                break;
 358                        }
 359
 360                        switch(resp.message_id) {
 361                        case MSG_STREAM_START_INPUT_STAGE_PACKET:
 362                        case MSG_STREAM_START_OUTPUT_STAGE_PACKET:
 363                        case MSG_STREAM_STOP_INPUT_STAGE_PACKET:
 364                        case MSG_STREAM_STOP_OUTPUT_STAGE_PACKET:
 365                                if(mixart_msg_data[0])
 366                                        dev_err(&mgr->pci->dev,
 367                                                "error MSG_STREAM_ST***_***PUT_STAGE_PACKET status=%x\n",
 368                                                mixart_msg_data[0]);
 369                                break;
 370                        default:
 371                                dev_dbg(&mgr->pci->dev,
 372                                        "received mf(%x) : msg_id(%x) uid(%x, %x) size(%zd)\n",
 373                                           msg, resp.message_id, resp.uid.object_id, resp.uid.desc, resp.size);
 374                                break;
 375                        }
 376                        break;
 377                case MSG_TYPE_NOTIFY:
 378                        /* msg contains no address ! do not get_msg() ! */
 379                case MSG_TYPE_COMMAND:
 380                        /* get_msg() necessary */
 381                default:
 382                        dev_err(&mgr->pci->dev,
 383                                "doesn't know what to do with message %x\n",
 384                                msg);
 385                } /* switch type */
 386
 387                /* decrement counter */
 388                atomic_dec(&mgr->msg_processed);
 389
 390        } /* while there is a msg in fifo */
 391}
 392
 393
 394irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
 395{
 396        struct mixart_mgr *mgr = dev_id;
 397        u32 it_reg;
 398
 399        it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));
 400        if( !(it_reg & MIXART_OIDI) ) {
 401                /* this device did not cause the interrupt */
 402                return IRQ_NONE;
 403        }
 404
 405        /* mask all interrupts */
 406        writel_le(MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG(mgr, MIXART_PCI_OMIMR_OFFSET));
 407
 408        /* outdoorbell register clear */
 409        it_reg = readl(MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
 410        writel(it_reg, MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
 411
 412        /* clear interrupt */
 413        writel_le( MIXART_OIDI, MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET) );
 414
 415        return IRQ_WAKE_THREAD;
 416}
 417
 418irqreturn_t snd_mixart_threaded_irq(int irq, void *dev_id)
 419{
 420        struct mixart_mgr *mgr = dev_id;
 421        int err;
 422        struct mixart_msg resp;
 423        u32 msg;
 424
 425        mutex_lock(&mgr->lock);
 426        /* process interrupt */
 427        while (retrieve_msg_frame(mgr, &msg)) {
 428
 429                switch (msg & MSG_TYPE_MASK) {
 430                case MSG_TYPE_COMMAND:
 431                        resp.message_id = 0;
 432                        resp.data = mixart_msg_data;
 433                        resp.size = sizeof(mixart_msg_data);
 434                        err = get_msg(mgr, &resp, msg & ~MSG_TYPE_MASK);
 435                        if( err < 0 ) {
 436                                dev_err(&mgr->pci->dev,
 437                                        "interrupt: error(%d) reading mf %x\n",
 438                                        err, msg);
 439                                break;
 440                        }
 441
 442                        if(resp.message_id == MSG_SERVICES_TIMER_NOTIFY) {
 443                                int i;
 444                                struct mixart_timer_notify *notify;
 445                                notify = (struct mixart_timer_notify *)mixart_msg_data;
 446
 447                                for(i=0; i<notify->stream_count; i++) {
 448
 449                                        u32 buffer_id = notify->streams[i].buffer_id;
 450                                        unsigned int chip_number =  (buffer_id & MIXART_NOTIFY_CARD_MASK) >> MIXART_NOTIFY_CARD_OFFSET; /* card0 to 3 */
 451                                        unsigned int pcm_number  =  (buffer_id & MIXART_NOTIFY_PCM_MASK ) >> MIXART_NOTIFY_PCM_OFFSET;  /* pcm0 to 3  */
 452                                        unsigned int sub_number  =   buffer_id & MIXART_NOTIFY_SUBS_MASK;             /* 0 to MIXART_PLAYBACK_STREAMS */
 453                                        unsigned int is_capture  = ((buffer_id & MIXART_NOTIFY_CAPT_MASK) != 0);      /* playback == 0 / capture == 1 */
 454
 455                                        struct snd_mixart *chip  = mgr->chip[chip_number];
 456                                        struct mixart_stream *stream;
 457
 458                                        if ((chip_number >= mgr->num_cards) || (pcm_number >= MIXART_PCM_TOTAL) || (sub_number >= MIXART_PLAYBACK_STREAMS)) {
 459                                                dev_err(&mgr->pci->dev,
 460                                                        "error MSG_SERVICES_TIMER_NOTIFY buffer_id (%x) pos(%d)\n",
 461                                                           buffer_id, notify->streams[i].sample_pos_low_part);
 462                                                break;
 463                                        }
 464
 465                                        if (is_capture)
 466                                                stream = &chip->capture_stream[pcm_number];
 467                                        else
 468                                                stream = &chip->playback_stream[pcm_number][sub_number];
 469
 470                                        if (stream->substream && (stream->status == MIXART_STREAM_STATUS_RUNNING)) {
 471                                                struct snd_pcm_runtime *runtime = stream->substream->runtime;
 472                                                int elapsed = 0;
 473                                                u64 sample_count = ((u64)notify->streams[i].sample_pos_high_part) << 32;
 474                                                sample_count |= notify->streams[i].sample_pos_low_part;
 475
 476                                                while (1) {
 477                                                        u64 new_elapse_pos = stream->abs_period_elapsed +  runtime->period_size;
 478
 479                                                        if (new_elapse_pos > sample_count) {
 480                                                                break; /* while */
 481                                                        }
 482                                                        else {
 483                                                                elapsed = 1;
 484                                                                stream->buf_periods++;
 485                                                                if (stream->buf_periods >= runtime->periods)
 486                                                                        stream->buf_periods = 0;
 487
 488                                                                stream->abs_period_elapsed = new_elapse_pos;
 489                                                        }
 490                                                }
 491                                                stream->buf_period_frag = (u32)( sample_count - stream->abs_period_elapsed );
 492
 493                                                if(elapsed) {
 494                                                        mutex_unlock(&mgr->lock);
 495                                                        snd_pcm_period_elapsed(stream->substream);
 496                                                        mutex_lock(&mgr->lock);
 497                                                }
 498                                        }
 499                                }
 500                                break;
 501                        }
 502                        if(resp.message_id == MSG_SERVICES_REPORT_TRACES) {
 503                                if(resp.size > 1) {
 504#ifndef __BIG_ENDIAN
 505                                        /* Traces are text: the swapped msg_data has to be swapped back ! */
 506                                        int i;
 507                                        for(i=0; i<(resp.size/4); i++) {
 508                                                ((__be32*)mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);
 509                                        }
 510#endif
 511                                        ((char*)mixart_msg_data)[resp.size - 1] = 0;
 512                                        dev_dbg(&mgr->pci->dev,
 513                                                "MIXART TRACE : %s\n",
 514                                                (char *)mixart_msg_data);
 515                                }
 516                                break;
 517                        }
 518
 519                        dev_dbg(&mgr->pci->dev, "command %x not handled\n",
 520                                resp.message_id);
 521                        break;
 522
 523                case MSG_TYPE_NOTIFY:
 524                        if(msg & MSG_CANCEL_NOTIFY_MASK) {
 525                                msg &= ~MSG_CANCEL_NOTIFY_MASK;
 526                                dev_err(&mgr->pci->dev,
 527                                        "canceled notification %x !\n", msg);
 528                        }
 529                        fallthrough;
 530                case MSG_TYPE_ANSWER:
 531                        /* answer or notification to a message we are waiting for*/
 532                        mutex_lock(&mgr->msg_lock);
 533                        if( (msg & ~MSG_TYPE_MASK) == mgr->pending_event ) {
 534                                wake_up(&mgr->msg_sleep);
 535                                mgr->pending_event = 0;
 536                        }
 537                        /* answer to a message we did't want to wait for */
 538                        else {
 539                                mgr->msg_fifo[mgr->msg_fifo_writeptr] = msg;
 540                                mgr->msg_fifo_writeptr++;
 541                                mgr->msg_fifo_writeptr %= MSG_FIFO_SIZE;
 542                                snd_mixart_process_msg(mgr);
 543                        }
 544                        mutex_unlock(&mgr->msg_lock);
 545                        break;
 546                case MSG_TYPE_REQUEST:
 547                default:
 548                        dev_dbg(&mgr->pci->dev,
 549                                "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        mutex_unlock(&mgr->lock);
 559
 560        return IRQ_HANDLED;
 561}
 562
 563
 564void snd_mixart_init_mailbox(struct mixart_mgr *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
 576void snd_mixart_exit_mailbox(struct mixart_mgr *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
 583void snd_mixart_reset_board(struct mixart_mgr *mgr)
 584{
 585        /* reset miXart */
 586        writel_be( 1, MIXART_REG(mgr, MIXART_BA1_BRUTAL_RESET_OFFSET) );
 587        return;
 588}
 589