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#include <linux/pci.h>
  26#include <linux/io.h>
  27
  28#include <sound/core.h>
  29#include "mixart.h"
  30#include "mixart_hwdep.h"
  31#include "mixart_core.h"
  32
  33
  34#define MSG_TIMEOUT_JIFFIES         (400 * HZ) / 1000 /* 400 ms */
  35
  36#define MSG_DESCRIPTOR_SIZE         0x24
  37#define MSG_HEADER_SIZE             (MSG_DESCRIPTOR_SIZE + 4)
  38
  39#define MSG_DEFAULT_SIZE            512
  40
  41#define MSG_TYPE_MASK               0x00000003    /* mask for following types */
  42#define MSG_TYPE_NOTIFY             0             /* embedded -> driver (only notification, do not get_msg() !) */
  43#define MSG_TYPE_COMMAND            1             /* driver <-> embedded (a command has no answer) */
  44#define MSG_TYPE_REQUEST            2             /* driver -> embedded (request will get an answer back) */
  45#define MSG_TYPE_ANSWER             3             /* embedded -> driver */
  46#define MSG_CANCEL_NOTIFY_MASK      0x80000000    /* this bit is set for a notification that has been canceled */
  47
  48
  49static int retrieve_msg_frame(struct mixart_mgr *mgr, u32 *msg_frame)
  50{
  51        /* read the message frame fifo */
  52        u32 headptr, tailptr;
  53
  54        tailptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
  55        headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_HEAD));
  56
  57        if (tailptr == headptr)
  58                return 0; /* no message posted */
  59
  60        if (tailptr < MSG_OUTBOUND_POST_STACK)
  61                return 0; /* error */
  62        if (tailptr >= MSG_OUTBOUND_POST_STACK + MSG_BOUND_STACK_SIZE)
  63                return 0; /* error */
  64
  65        *msg_frame = readl_be(MIXART_MEM(mgr, tailptr));
  66
  67        /* increment the tail index */
  68        tailptr += 4;
  69        if( tailptr >= (MSG_OUTBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
  70                tailptr = MSG_OUTBOUND_POST_STACK;
  71        writel_be(tailptr, MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
  72
  73        return 1;
  74}
  75
  76static int get_msg(struct mixart_mgr *mgr, struct mixart_msg *resp,
  77                   u32 msg_frame_address )
  78{
  79        u32  headptr;
  80        u32  size;
  81        int  err;
  82#ifndef __BIG_ENDIAN
  83        unsigned int i;
  84#endif
  85
  86        mutex_lock(&mgr->msg_lock);
  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                dev_err(&mgr->pci->dev,
  98                        "problem with response size = %d\n", size);
  99                goto _clean_exit;
 100        }
 101        size -= MSG_DESCRIPTOR_SIZE;
 102
 103        memcpy_fromio(resp->data, MIXART_MEM(mgr, msg_frame_address + MSG_HEADER_SIZE ), size);
 104        resp->size = size;
 105
 106        /* swap if necessary */
 107#ifndef __BIG_ENDIAN
 108        size /= 4; /* u32 size */
 109        for(i=0; i < size; i++) {
 110                ((u32*)resp->data)[i] = be32_to_cpu(((u32*)resp->data)[i]);
 111        }
 112#endif
 113
 114        /*
 115         * free message frame address
 116         */
 117        headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 118
 119        if( (headptr < MSG_OUTBOUND_FREE_STACK) || ( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
 120                err = -EINVAL;
 121                goto _clean_exit;
 122        }
 123
 124        /* give address back to outbound fifo */
 125        writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
 126
 127        /* increment the outbound free head */
 128        headptr += 4;
 129        if( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
 130                headptr = MSG_OUTBOUND_FREE_STACK;
 131
 132        writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 133
 134 _clean_exit:
 135        mutex_unlock(&mgr->msg_lock);
 136
 137        return err;
 138}
 139
 140
 141/*
 142 * send a message to miXart. return: the msg_frame used for this message
 143 */
 144/* call with mgr->msg_lock held! */
 145static int send_msg( struct mixart_mgr *mgr,
 146                     struct mixart_msg *msg,
 147                     int max_answersize,
 148                     int mark_pending,
 149                     u32 *msg_event)
 150{
 151        u32 headptr, tailptr;
 152        u32 msg_frame_address;
 153        int i;
 154
 155        if (snd_BUG_ON(msg->size % 4))
 156                return -EINVAL;
 157
 158        /* get message frame address */
 159        tailptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
 160        headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_HEAD));
 161
 162        if (tailptr == headptr) {
 163                dev_err(&mgr->pci->dev, "error: no message frame available\n");
 164                return -EBUSY;
 165        }
 166
 167        if( (tailptr < MSG_INBOUND_FREE_STACK) || (tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
 168                return -EINVAL;
 169        }
 170
 171        msg_frame_address = readl_be(MIXART_MEM(mgr, tailptr));
 172        writel(0, MIXART_MEM(mgr, tailptr)); /* set address to zero on this fifo position */
 173
 174        /* increment the inbound free tail */
 175        tailptr += 4;
 176        if( tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
 177                tailptr = MSG_INBOUND_FREE_STACK;
 178
 179        writel_be(tailptr, MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
 180
 181        /* TODO : use memcpy_toio() with intermediate buffer to copy the message */
 182
 183        /* copy message descriptor to card memory */
 184        writel_be( msg->size + MSG_DESCRIPTOR_SIZE,      MIXART_MEM(mgr, msg_frame_address) );      /* size of descriptor + request */
 185        writel_be( msg->message_id ,                     MIXART_MEM(mgr, msg_frame_address + 4) );  /* dwMessageID */
 186        writel_be( msg->uid.object_id,                   MIXART_MEM(mgr, msg_frame_address + 8) );  /* uidDest */
 187        writel_be( msg->uid.desc,                        MIXART_MEM(mgr, msg_frame_address + 12) ); /* */
 188        writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 16) ); /* SizeHeader */
 189        writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 20) ); /* OffsetDLL_T16 */
 190        writel_be( msg->size,                            MIXART_MEM(mgr, msg_frame_address + 24) ); /* SizeDLL_T16 */
 191        writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 28) ); /* OffsetDLL_DRV */
 192        writel_be( 0,                                    MIXART_MEM(mgr, msg_frame_address + 32) ); /* SizeDLL_DRV */
 193        writel_be( MSG_DESCRIPTOR_SIZE + max_answersize, MIXART_MEM(mgr, msg_frame_address + 36) ); /* dwExpectedAnswerSize */
 194
 195        /* copy message data to card memory */
 196        for( i=0; i < msg->size; i+=4 ) {
 197                writel_be( *(u32*)(msg->data + i), MIXART_MEM(mgr, MSG_HEADER_SIZE + msg_frame_address + i)  );
 198        }
 199
 200        if( mark_pending ) {
 201                if( *msg_event ) {
 202                        /* the pending event is the notification we wait for ! */
 203                        mgr->pending_event = *msg_event;
 204                }
 205                else {
 206                        /* the pending event is the answer we wait for (same address than the request)! */
 207                        mgr->pending_event = msg_frame_address;
 208
 209                        /* copy address back to caller */
 210                        *msg_event = msg_frame_address;
 211                }
 212        }
 213
 214        /* mark the frame as a request (will have an answer) */
 215        msg_frame_address |= MSG_TYPE_REQUEST;
 216
 217        /* post the frame */
 218        headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
 219
 220        if( (headptr < MSG_INBOUND_POST_STACK) || (headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE))) {
 221                return -EINVAL;
 222        }
 223
 224        writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
 225
 226        /* increment the inbound post head */
 227        headptr += 4;
 228        if( headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
 229                headptr = MSG_INBOUND_POST_STACK;
 230
 231        writel_be(headptr, MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
 232
 233        return 0;
 234}
 235
 236
 237int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int max_resp_size, void *resp_data)
 238{
 239        struct mixart_msg resp;
 240        u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */
 241        int err;
 242        wait_queue_t wait;
 243        long timeout;
 244
 245        init_waitqueue_entry(&wait, current);
 246
 247        mutex_lock(&mgr->msg_lock);
 248        /* send the message */
 249        err = send_msg(mgr, request, max_resp_size, 1, &msg_frame);  /* send and mark the answer pending */
 250        if (err) {
 251                mutex_unlock(&mgr->msg_lock);
 252                return err;
 253        }
 254
 255        set_current_state(TASK_UNINTERRUPTIBLE);
 256        add_wait_queue(&mgr->msg_sleep, &wait);
 257        mutex_unlock(&mgr->msg_lock);
 258        timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
 259        remove_wait_queue(&mgr->msg_sleep, &wait);
 260
 261        if (! timeout) {
 262                /* error - no ack */
 263                dev_err(&mgr->pci->dev,
 264                        "error: no response on msg %x\n", msg_frame);
 265                return -EIO;
 266        }
 267
 268        /* retrieve the answer into the same struct mixart_msg */
 269        resp.message_id = 0;
 270        resp.uid = (struct mixart_uid){0,0};
 271        resp.data = resp_data;
 272        resp.size = max_resp_size;
 273
 274        err = get_msg(mgr, &resp, msg_frame);
 275
 276        if( request->message_id != resp.message_id )
 277                dev_err(&mgr->pci->dev, "RESPONSE ERROR!\n");
 278
 279        return err;
 280}
 281
 282
 283int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
 284                                   struct mixart_msg *request, u32 notif_event)
 285{
 286        int err;
 287        wait_queue_t wait;
 288        long timeout;
 289
 290        if (snd_BUG_ON(!notif_event))
 291                return -EINVAL;
 292        if (snd_BUG_ON((notif_event & MSG_TYPE_MASK) != MSG_TYPE_NOTIFY))
 293                return -EINVAL;
 294        if (snd_BUG_ON(notif_event & MSG_CANCEL_NOTIFY_MASK))
 295                return -EINVAL;
 296
 297        init_waitqueue_entry(&wait, current);
 298
 299        mutex_lock(&mgr->msg_lock);
 300        /* send the message */
 301        err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event);  /* send and mark the notification event pending */
 302        if(err) {
 303                mutex_unlock(&mgr->msg_lock);
 304                return err;
 305        }
 306
 307        set_current_state(TASK_UNINTERRUPTIBLE);
 308        add_wait_queue(&mgr->msg_sleep, &wait);
 309        mutex_unlock(&mgr->msg_lock);
 310        timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
 311        remove_wait_queue(&mgr->msg_sleep, &wait);
 312
 313        if (! timeout) {
 314                /* error - no ack */
 315                dev_err(&mgr->pci->dev,
 316                        "error: notification %x not received\n", notif_event);
 317                return -EIO;
 318        }
 319
 320        return 0;
 321}
 322
 323
 324int snd_mixart_send_msg_nonblock(struct mixart_mgr *mgr, struct mixart_msg *request)
 325{
 326        u32 message_frame;
 327        int err;
 328
 329        /* just send the message (do not mark it as a pending one) */
 330        mutex_lock(&mgr->msg_lock);
 331        err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);
 332        mutex_unlock(&mgr->msg_lock);
 333
 334        /* the answer will be handled by snd_struct mixart_msgasklet()  */
 335        atomic_inc(&mgr->msg_processed);
 336
 337        return err;
 338}
 339
 340
 341/* common buffer of interrupt to send/receive messages */
 342static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
 343
 344
 345static void snd_mixart_process_msg(struct mixart_mgr *mgr)
 346{
 347        struct mixart_msg resp;
 348        u32 msg, addr, type;
 349        int err;
 350
 351        while (mgr->msg_fifo_readptr != mgr->msg_fifo_writeptr) {
 352                msg = mgr->msg_fifo[mgr->msg_fifo_readptr];
 353                mgr->msg_fifo_readptr++;
 354                mgr->msg_fifo_readptr %= MSG_FIFO_SIZE;
 355
 356                /* process the message ... */
 357                addr = msg & ~MSG_TYPE_MASK;
 358                type = msg & MSG_TYPE_MASK;
 359
 360                switch (type) {
 361                case MSG_TYPE_ANSWER:
 362                        /* answer to a message on that we did not wait for (send_msg_nonblock) */
 363                        resp.message_id = 0;
 364                        resp.data = mixart_msg_data;
 365                        resp.size = sizeof(mixart_msg_data);
 366                        err = get_msg(mgr, &resp, addr);
 367                        if( err < 0 ) {
 368                                dev_err(&mgr->pci->dev,
 369                                        "error(%d) reading mf %x\n",
 370                                        err, msg);
 371                                break;
 372                        }
 373
 374                        switch(resp.message_id) {
 375                        case MSG_STREAM_START_INPUT_STAGE_PACKET:
 376                        case MSG_STREAM_START_OUTPUT_STAGE_PACKET:
 377                        case MSG_STREAM_STOP_INPUT_STAGE_PACKET:
 378                        case MSG_STREAM_STOP_OUTPUT_STAGE_PACKET:
 379                                if(mixart_msg_data[0])
 380                                        dev_err(&mgr->pci->dev,
 381                                                "error MSG_STREAM_ST***_***PUT_STAGE_PACKET status=%x\n",
 382                                                mixart_msg_data[0]);
 383                                break;
 384                        default:
 385                                dev_dbg(&mgr->pci->dev,
 386                                        "received mf(%x) : msg_id(%x) uid(%x, %x) size(%zd)\n",
 387                                           msg, resp.message_id, resp.uid.object_id, resp.uid.desc, resp.size);
 388                                break;
 389                        }
 390                        break;
 391                case MSG_TYPE_NOTIFY:
 392                        /* msg contains no address ! do not get_msg() ! */
 393                case MSG_TYPE_COMMAND:
 394                        /* get_msg() necessary */
 395                default:
 396                        dev_err(&mgr->pci->dev,
 397                                "doesn't know what to do with message %x\n",
 398                                msg);
 399                } /* switch type */
 400
 401                /* decrement counter */
 402                atomic_dec(&mgr->msg_processed);
 403
 404        } /* while there is a msg in fifo */
 405}
 406
 407
 408irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
 409{
 410        struct mixart_mgr *mgr = dev_id;
 411        u32 it_reg;
 412
 413        it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));
 414        if( !(it_reg & MIXART_OIDI) ) {
 415                /* this device did not cause the interrupt */
 416                return IRQ_NONE;
 417        }
 418
 419        /* mask all interrupts */
 420        writel_le(MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG(mgr, MIXART_PCI_OMIMR_OFFSET));
 421
 422        /* outdoorbell register clear */
 423        it_reg = readl(MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
 424        writel(it_reg, MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
 425
 426        /* clear interrupt */
 427        writel_le( MIXART_OIDI, MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET) );
 428
 429        return IRQ_WAKE_THREAD;
 430}
 431
 432irqreturn_t snd_mixart_threaded_irq(int irq, void *dev_id)
 433{
 434        struct mixart_mgr *mgr = dev_id;
 435        int err;
 436        struct mixart_msg resp;
 437        u32 msg;
 438
 439        mutex_lock(&mgr->lock);
 440        /* process interrupt */
 441        while (retrieve_msg_frame(mgr, &msg)) {
 442
 443                switch (msg & MSG_TYPE_MASK) {
 444                case MSG_TYPE_COMMAND:
 445                        resp.message_id = 0;
 446                        resp.data = mixart_msg_data;
 447                        resp.size = sizeof(mixart_msg_data);
 448                        err = get_msg(mgr, &resp, msg & ~MSG_TYPE_MASK);
 449                        if( err < 0 ) {
 450                                dev_err(&mgr->pci->dev,
 451                                        "interrupt: error(%d) reading mf %x\n",
 452                                        err, msg);
 453                                break;
 454                        }
 455
 456                        if(resp.message_id == MSG_SERVICES_TIMER_NOTIFY) {
 457                                int i;
 458                                struct mixart_timer_notify *notify;
 459                                notify = (struct mixart_timer_notify *)mixart_msg_data;
 460
 461                                for(i=0; i<notify->stream_count; i++) {
 462
 463                                        u32 buffer_id = notify->streams[i].buffer_id;
 464                                        unsigned int chip_number =  (buffer_id & MIXART_NOTIFY_CARD_MASK) >> MIXART_NOTIFY_CARD_OFFSET; /* card0 to 3 */
 465                                        unsigned int pcm_number  =  (buffer_id & MIXART_NOTIFY_PCM_MASK ) >> MIXART_NOTIFY_PCM_OFFSET;  /* pcm0 to 3  */
 466                                        unsigned int sub_number  =   buffer_id & MIXART_NOTIFY_SUBS_MASK;             /* 0 to MIXART_PLAYBACK_STREAMS */
 467                                        unsigned int is_capture  = ((buffer_id & MIXART_NOTIFY_CAPT_MASK) != 0);      /* playback == 0 / capture == 1 */
 468
 469                                        struct snd_mixart *chip  = mgr->chip[chip_number];
 470                                        struct mixart_stream *stream;
 471
 472                                        if ((chip_number >= mgr->num_cards) || (pcm_number >= MIXART_PCM_TOTAL) || (sub_number >= MIXART_PLAYBACK_STREAMS)) {
 473                                                dev_err(&mgr->pci->dev,
 474                                                        "error MSG_SERVICES_TIMER_NOTIFY buffer_id (%x) pos(%d)\n",
 475                                                           buffer_id, notify->streams[i].sample_pos_low_part);
 476                                                break;
 477                                        }
 478
 479                                        if (is_capture)
 480                                                stream = &chip->capture_stream[pcm_number];
 481                                        else
 482                                                stream = &chip->playback_stream[pcm_number][sub_number];
 483
 484                                        if (stream->substream && (stream->status == MIXART_STREAM_STATUS_RUNNING)) {
 485                                                struct snd_pcm_runtime *runtime = stream->substream->runtime;
 486                                                int elapsed = 0;
 487                                                u64 sample_count = ((u64)notify->streams[i].sample_pos_high_part) << 32;
 488                                                sample_count |= notify->streams[i].sample_pos_low_part;
 489
 490                                                while (1) {
 491                                                        u64 new_elapse_pos = stream->abs_period_elapsed +  runtime->period_size;
 492
 493                                                        if (new_elapse_pos > sample_count) {
 494                                                                break; /* while */
 495                                                        }
 496                                                        else {
 497                                                                elapsed = 1;
 498                                                                stream->buf_periods++;
 499                                                                if (stream->buf_periods >= runtime->periods)
 500                                                                        stream->buf_periods = 0;
 501
 502                                                                stream->abs_period_elapsed = new_elapse_pos;
 503                                                        }
 504                                                }
 505                                                stream->buf_period_frag = (u32)( sample_count - stream->abs_period_elapsed );
 506
 507                                                if(elapsed) {
 508                                                        mutex_unlock(&mgr->lock);
 509                                                        snd_pcm_period_elapsed(stream->substream);
 510                                                        mutex_lock(&mgr->lock);
 511                                                }
 512                                        }
 513                                }
 514                                break;
 515                        }
 516                        if(resp.message_id == MSG_SERVICES_REPORT_TRACES) {
 517                                if(resp.size > 1) {
 518#ifndef __BIG_ENDIAN
 519                                        /* Traces are text: the swapped msg_data has to be swapped back ! */
 520                                        int i;
 521                                        for(i=0; i<(resp.size/4); i++) {
 522                                                (mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);
 523                                        }
 524#endif
 525                                        ((char*)mixart_msg_data)[resp.size - 1] = 0;
 526                                        dev_dbg(&mgr->pci->dev,
 527                                                "MIXART TRACE : %s\n",
 528                                                (char *)mixart_msg_data);
 529                                }
 530                                break;
 531                        }
 532
 533                        dev_dbg(&mgr->pci->dev, "command %x not handled\n",
 534                                resp.message_id);
 535                        break;
 536
 537                case MSG_TYPE_NOTIFY:
 538                        if(msg & MSG_CANCEL_NOTIFY_MASK) {
 539                                msg &= ~MSG_CANCEL_NOTIFY_MASK;
 540                                dev_err(&mgr->pci->dev,
 541                                        "canceled notification %x !\n", msg);
 542                        }
 543                        /* no break, continue ! */
 544                case MSG_TYPE_ANSWER:
 545                        /* answer or notification to a message we are waiting for*/
 546                        mutex_lock(&mgr->msg_lock);
 547                        if( (msg & ~MSG_TYPE_MASK) == mgr->pending_event ) {
 548                                wake_up(&mgr->msg_sleep);
 549                                mgr->pending_event = 0;
 550                        }
 551                        /* answer to a message we did't want to wait for */
 552                        else {
 553                                mgr->msg_fifo[mgr->msg_fifo_writeptr] = msg;
 554                                mgr->msg_fifo_writeptr++;
 555                                mgr->msg_fifo_writeptr %= MSG_FIFO_SIZE;
 556                                snd_mixart_process_msg(mgr);
 557                        }
 558                        mutex_unlock(&mgr->msg_lock);
 559                        break;
 560                case MSG_TYPE_REQUEST:
 561                default:
 562                        dev_dbg(&mgr->pci->dev,
 563                                "interrupt received request %x\n", msg);
 564                        /* TODO : are there things to do here ? */
 565                        break;
 566                } /* switch on msg type */
 567        } /* while there are msgs */
 568
 569        /* allow interrupt again */
 570        writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 571
 572        mutex_unlock(&mgr->lock);
 573
 574        return IRQ_HANDLED;
 575}
 576
 577
 578void snd_mixart_init_mailbox(struct mixart_mgr *mgr)
 579{
 580        writel( 0, MIXART_MEM( mgr, MSG_HOST_RSC_PROTECTION ) );
 581        writel( 0, MIXART_MEM( mgr, MSG_AGENT_RSC_PROTECTION ) );
 582
 583        /* allow outbound messagebox to generate interrupts */
 584        if(mgr->irq >= 0) {
 585                writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 586        }
 587        return;
 588}
 589
 590void snd_mixart_exit_mailbox(struct mixart_mgr *mgr)
 591{
 592        /* no more interrupts on outbound messagebox */
 593        writel_le( MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
 594        return;
 595}
 596
 597void snd_mixart_reset_board(struct mixart_mgr *mgr)
 598{
 599        /* reset miXart */
 600        writel_be( 1, MIXART_REG(mgr, MIXART_BA1_BRUTAL_RESET_OFFSET) );
 601        return;
 602}
 603