sound/arm/omap/omap-alsa.c

   1 /*
   2  * sound/arm/omap-alsa.c
   3  *
   4  * Alsa Driver for OMAP
   5  *
   6  * Copyright (C) 2005 Instituto Nokia de Tecnologia - INdT - Manaus Brazil
   7  * Written by Daniel Petrini, David Cohen, Anderson Briglia
   8  *            {daniel.petrini, david.cohen, anderson.briglia}@indt.org.br
   9  *
  10  * Copyright (C) 2006 Mika Laitio <lamikr@cc.jyu.fi>
  11  *
  12  * Based on sa11xx-uda1341.c,
  13  * Copyright (C) 2002 Tomas Kasparek <tomas.kasparek@seznam.cz>
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by the
  17  * Free Software Foundation; either version 2 of the License, or (at your
  18  * option) any later version.
  19  *
  20  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  21  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  22  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  23  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  27  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  * You should have received a copy of the  GNU General Public License along
  32  * with this program; if not, write  to the Free Software Foundation, Inc.,
  33  * 675 Mass Ave, Cambridge, MA 02139, USA.
  34  *
  35  * History:
  36  *
  37  * 2005-07-29   INdT Kernel Team - Alsa driver for omap osk. Creation of new
  38  *                                 file omap-aic23.c
  39  *
  40  * 2005-12-18   Dirk Behme       - Added L/R Channel Interchange fix as proposed
  41  *                                 by Ajaya Babu
  42  *
  43  */
  44
  45 #include <linux/platform_device.h>
  46 #ifdef CONFIG_PM
  47 #include <linux/pm.h>
  48 #endif
  49 #include <sound/driver.h>
  50 #include <sound/core.h>
  51
  52 #include <asm/arch/omap-alsa.h>
  53 #include "omap-alsa-dma.h"
  54
  55 MODULE_AUTHOR("Mika Laitio, Daniel Petrini, David Cohen, Anderson Briglia - INdT");
  56 MODULE_LICENSE("GPL");
  57 MODULE_DESCRIPTION("OMAP driver for ALSA");
  58 MODULE_ALIAS("omap_alsa_mcbsp.1");
  59
  60 static char *id = NULL;
  61 static struct snd_card_omap_codec       *alsa_codec             = NULL;
  62 static struct omap_alsa_codec_config    *alsa_codec_config      = NULL;
  63
  64 /*
  65  * HW interface start and stop helper functions
  66  */
  67 static int audio_ifc_start(void)
  68 {
  69         omap_mcbsp_start(AUDIO_MCBSP);
  70         return 0;
  71 }
  72
  73 static int audio_ifc_stop(void)
  74 {
  75         omap_mcbsp_stop(AUDIO_MCBSP);
  76         return 0;
  77 }
  78
  79 static void omap_alsa_audio_init(struct snd_card_omap_codec *omap_alsa)
  80 {
  81         /* Setup DMA stuff */
  82         omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK].id = "Alsa omap out";
  83         omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK].stream_id =
  84             SNDRV_PCM_STREAM_PLAYBACK;
  85         omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK].dma_dev =
  86             OMAP_DMA_MCBSP1_TX;
  87         omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK].hw_start =
  88             audio_ifc_start;
  89         omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK].hw_stop =
  90             audio_ifc_stop;
  91
  92         omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE].id = "Alsa omap in";
  93         omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE].stream_id =
  94             SNDRV_PCM_STREAM_CAPTURE;
  95         omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE].dma_dev =
  96             OMAP_DMA_MCBSP1_RX;
  97         omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE].hw_start =
  98             audio_ifc_start;
  99         omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE].hw_stop =
 100             audio_ifc_stop;
 101 }
 102
 103 /*
 104  * DMA functions
 105  * Depends on omap-alsa-dma.c functions and (omap) dma.c
 106  *
 107  */
 108 static int audio_dma_request(struct audio_stream *s,
 109                              void (*callback) (void *))
 110 {
 111         int err;
 112         ADEBUG();
 113
 114         err = omap_request_alsa_sound_dma(s->dma_dev, s->id, s, &s->lch);
 115         if (err < 0)
 116                 printk(KERN_ERR "Unable to grab audio dma 0x%x\n", s->dma_dev);
 117         return err;
 118 }
 119
 120 static int audio_dma_free(struct audio_stream *s)
 121 {
 122         int err = 0;
 123         ADEBUG();
 124
 125         err = omap_free_alsa_sound_dma(s, &s->lch);
 126         if (err < 0)
 127                 printk(KERN_ERR "Unable to free audio dma channels!\n");
 128         return err;
 129 }
 130
 131 /*
 132  *  This function should calculate the current position of the dma in the
 133  *  buffer. It will help alsa middle layer to continue update the buffer.
 134  *  Its correctness is crucial for good functioning.
 135  */
 136 static u_int audio_get_dma_pos(struct audio_stream *s)
 137 {
 138         snd_pcm_substream_t *substream = s->stream;
 139         snd_pcm_runtime_t *runtime = substream->runtime;
 140         unsigned int offset;
 141         unsigned long flags;
 142         dma_addr_t count;
 143         ADEBUG();
 144
 145         /* this must be called w/ interrupts locked as requested in dma.c */
 146         spin_lock_irqsave(&s->dma_lock, flags);
 147
 148         /* For the current period let's see where we are */
 149         count = omap_get_dma_src_addr_counter(s->lch[s->dma_q_head]);
 150
 151         spin_unlock_irqrestore(&s->dma_lock, flags);
 152
 153         /* Now, the position related to the end of that period */
 154         offset = bytes_to_frames(runtime, s->offset) - bytes_to_frames(runtime, count);
 155
 156         if (offset >= runtime->buffer_size)
 157                 offset = 0;
 158
 159         return offset;
 160 }
 161
 162 /*
 163  * this stops the dma and clears the dma ptrs
 164  */
 165 static void audio_stop_dma(struct audio_stream *s)
 166 {
 167         unsigned long flags;
 168         ADEBUG();
 169
 170         spin_lock_irqsave(&s->dma_lock, flags);
 171         s->active = 0;
 172         s->period = 0;
 173         s->periods = 0;
 174
 175         /* this stops the dma channel and clears the buffer ptrs */
 176         omap_stop_alsa_sound_dma(s);
 177
 178         omap_clear_alsa_sound_dma(s);
 179
 180         spin_unlock_irqrestore(&s->dma_lock, flags);
 181 }
 182
 183 /*
 184  *  Main dma routine, requests dma according where you are in main alsa buffer
 185  */
 186 static void audio_process_dma(struct audio_stream *s)
 187 {
 188         snd_pcm_substream_t *substream = s->stream;
 189         snd_pcm_runtime_t *runtime;
 190         unsigned int dma_size;
 191         unsigned int offset;
 192         int ret;
 193         unsigned long flags;
 194
 195         ADEBUG();
 196         runtime = substream->runtime;
 197         if (s->active) {
 198                 dma_size = frames_to_bytes(runtime, runtime->period_size);
 199                 offset = dma_size * s->period;
 200                 snd_assert(dma_size <= DMA_BUF_SIZE,);
 201                 /*
 202                  * On omap1510 based devices, we need to call the stop_dma
 203                  * before calling the start_dma or we will not receive the
 204                  * irq from DMA after the first transfered/played buffer.
 205                  * (invocation of callback_omap_alsa_sound_dma() method).
 206                  */
 207                 if (cpu_is_omap15xx()) {
 208                         spin_lock_irqsave(&s->dma_lock, flags);
 209                         omap_stop_alsa_sound_dma(s);
 210                         spin_unlock_irqrestore(&s->dma_lock, flags);
 211                 }
 212                 ret = omap_start_alsa_sound_dma(s,
 213                                 (dma_addr_t)runtime->dma_area + offset,
 214                                 dma_size);
 215                 if (ret) {
 216                         printk(KERN_ERR
 217                                "audio_process_dma: cannot queue DMA buffer (%i)\n",
 218                                ret);
 219                         return;
 220                 }
 221
 222                 s->period++;
 223                 s->period %= runtime->periods;
 224                 s->periods++;
 225                 s->offset = offset;
 226         }
 227 }
 228
 229 /*
 230  *  This is called when dma IRQ occurs at the end of each transmited block
 231  */
 232 void callback_omap_alsa_sound_dma(void *data)
 233 {
 234         struct audio_stream *s = data;
 235
 236         ADEBUG();
 237         /*
 238          * If we are getting a callback for an active stream then we inform
 239          * the PCM middle layer we've finished a period
 240          */
 241         if (s->active)
 242                 snd_pcm_period_elapsed(s->stream);
 243
 244         spin_lock(&s->dma_lock);
 245         if (s->periods > 0)
 246                 s->periods--;
 247
 248         audio_process_dma(s);
 249         spin_unlock(&s->dma_lock);
 250 }
 251
 252 /*
 253  * Alsa section
 254  * PCM settings and callbacks
 255  */
 256 static int snd_omap_alsa_trigger(snd_pcm_substream_t * substream, int cmd)
 257 {
 258         struct snd_card_omap_codec *chip =
 259             snd_pcm_substream_chip(substream);
 260         int stream_id = substream->pstr->stream;
 261         struct audio_stream *s = &chip->s[stream_id];
 262         int err = 0;
 263
 264         ADEBUG();
 265         /* note local interrupts are already disabled in the midlevel code */
 266         spin_lock(&s->dma_lock);
 267         switch (cmd) {
 268         case SNDRV_PCM_TRIGGER_START:
 269                 /* requested stream startup */
 270                 s->active = 1;
 271                 audio_process_dma(s);
 272                 break;
 273         case SNDRV_PCM_TRIGGER_STOP:
 274                 /* requested stream shutdown */
 275                 audio_stop_dma(s);
 276                 break;
 277         default:
 278                 err = -EINVAL;
 279                 break;
 280         }
 281         spin_unlock(&s->dma_lock);
 282
 283         return err;
 284 }
 285
 286 static int snd_omap_alsa_prepare(snd_pcm_substream_t * substream)
 287 {
 288         struct snd_card_omap_codec *chip = snd_pcm_substream_chip(substream);
 289         snd_pcm_runtime_t *runtime = substream->runtime;
 290         struct audio_stream *s = &chip->s[substream->pstr->stream];
 291
 292         ADEBUG();
 293         /* set requested samplerate */
 294         alsa_codec_config->codec_set_samplerate(runtime->rate);
 295         chip->samplerate = runtime->rate;
 296
 297         s->period = 0;
 298         s->periods = 0;
 299
 300         return 0;
 301 }
 302
 303 static snd_pcm_uframes_t snd_omap_alsa_pointer(snd_pcm_substream_t *substream)
 304 {
 305         struct snd_card_omap_codec *chip = snd_pcm_substream_chip(substream);
 306
 307         ADEBUG();
 308         return audio_get_dma_pos(&chip->s[substream->pstr->stream]);
 309 }
 310
 311 static int snd_card_omap_alsa_open(snd_pcm_substream_t * substream)
 312 {
 313         struct snd_card_omap_codec *chip =
 314             snd_pcm_substream_chip(substream);
 315         snd_pcm_runtime_t *runtime = substream->runtime;
 316         int stream_id = substream->pstr->stream;
 317         int err;
 318
 319         ADEBUG();
 320         chip->s[stream_id].stream = substream;
 321         alsa_codec_config->codec_clock_on();
 322         if (stream_id == SNDRV_PCM_STREAM_PLAYBACK)
 323                 runtime->hw = *(alsa_codec_config->snd_omap_alsa_playback);
 324         else
 325                 runtime->hw = *(alsa_codec_config->snd_omap_alsa_capture);
 326
 327         if ((err = snd_pcm_hw_constraint_integer(runtime,
 328                                            SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
 329                 return err;
 330
 331         if ((err = snd_pcm_hw_constraint_list(runtime,
 332                                         0,
 333                                         SNDRV_PCM_HW_PARAM_RATE,
 334                                         alsa_codec_config->hw_constraints_rates)) < 0)
 335                 return err;
 336
 337         return 0;
 338 }
 339
 340 static int snd_card_omap_alsa_close(snd_pcm_substream_t * substream)
 341 {
 342         struct snd_card_omap_codec *chip = snd_pcm_substream_chip(substream);
 343
 344         ADEBUG();
 345         alsa_codec_config->codec_clock_off();
 346         chip->s[substream->pstr->stream].stream = NULL;
 347
 348         return 0;
 349 }
 350
 351 /* HW params & free */
 352 static int snd_omap_alsa_hw_params(snd_pcm_substream_t * substream,
 353                                     snd_pcm_hw_params_t * hw_params)
 354 {
 355         return snd_pcm_lib_malloc_pages(substream,
 356                                         params_buffer_bytes(hw_params));
 357 }
 358
 359 static int snd_omap_alsa_hw_free(snd_pcm_substream_t * substream)
 360 {
 361         return snd_pcm_lib_free_pages(substream);
 362 }
 363
 364 /* pcm operations */
 365 static snd_pcm_ops_t snd_card_omap_alsa_playback_ops = {
 366         .open =         snd_card_omap_alsa_open,
 367         .close =        snd_card_omap_alsa_close,
 368         .ioctl =        snd_pcm_lib_ioctl,
 369         .hw_params =    snd_omap_alsa_hw_params,
 370         .hw_free =      snd_omap_alsa_hw_free,
 371         .prepare =      snd_omap_alsa_prepare,
 372         .trigger =      snd_omap_alsa_trigger,
 373         .pointer =      snd_omap_alsa_pointer,
 374 };
 375
 376 static snd_pcm_ops_t snd_card_omap_alsa_capture_ops = {
 377         .open =         snd_card_omap_alsa_open,
 378         .close =        snd_card_omap_alsa_close,
 379         .ioctl =        snd_pcm_lib_ioctl,
 380         .hw_params =    snd_omap_alsa_hw_params,
 381         .hw_free =      snd_omap_alsa_hw_free,
 382         .prepare =      snd_omap_alsa_prepare,
 383         .trigger =      snd_omap_alsa_trigger,
 384         .pointer =      snd_omap_alsa_pointer,
 385 };
 386
 387 /*
 388  *  Alsa init and exit section
 389  *
 390  *  Inits pcm alsa structures, allocate the alsa buffer, suspend, resume
 391  */
 392 static int __init snd_card_omap_alsa_pcm(struct snd_card_omap_codec *omap_alsa,
 393                                         int device)
 394 {
 395         snd_pcm_t *pcm;
 396         int err;
 397
 398         ADEBUG();
 399         if ((err = snd_pcm_new(omap_alsa->card, "OMAP PCM", device, 1, 1, &pcm)) < 0)
 400                 return err;
 401
 402         /* sets up initial buffer with continuous allocation */
 403         snd_pcm_lib_preallocate_pages_for_all(pcm,
 404                                               SNDRV_DMA_TYPE_CONTINUOUS,
 405                                               snd_dma_continuous_data
 406                                               (GFP_KERNEL),
 407                                               128 * 1024, 128 * 1024);
 408
 409         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 410                         &snd_card_omap_alsa_playback_ops);
 411         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 412                         &snd_card_omap_alsa_capture_ops);
 413         pcm->private_data = omap_alsa;
 414         pcm->info_flags = 0;
 415         strcpy(pcm->name, "omap alsa pcm");
 416
 417         omap_alsa_audio_init(omap_alsa);
 418
 419         /* setup DMA controller */
 420         audio_dma_request(&omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK],
 421                           callback_omap_alsa_sound_dma);
 422         audio_dma_request(&omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE],
 423                           callback_omap_alsa_sound_dma);
 424
 425         omap_alsa->pcm = pcm;
 426
 427         return 0;
 428 }
 429
 430
 431 #ifdef CONFIG_PM
 432 /*
 433  * Driver suspend/resume - calls alsa functions. Some hints from aaci.c
 434  */
 435 int snd_omap_alsa_suspend(struct platform_device *pdev, pm_message_t state)
 436 {
 437         struct snd_card_omap_codec *chip;
 438         snd_card_t *card = platform_get_drvdata(pdev);
 439
 440         if (card->power_state != SNDRV_CTL_POWER_D3hot) {
 441                 chip = card->private_data;
 442                 if (chip->card->power_state != SNDRV_CTL_POWER_D3hot) {
 443                         snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 444                         snd_pcm_suspend_all(chip->pcm);
 445                         /* Mutes and turn clock off */
 446                         alsa_codec_config->codec_clock_off();
 447                         snd_omap_suspend_mixer();
 448                 }
 449         }
 450         return 0;
 451 }
 452
 453 int snd_omap_alsa_resume(struct platform_device *pdev)
 454 {
 455         struct snd_card_omap_codec *chip;
 456         snd_card_t *card = platform_get_drvdata(pdev);
 457
 458         if (card->power_state != SNDRV_CTL_POWER_D0) {
 459                 chip = card->private_data;
 460                 if (chip->card->power_state != SNDRV_CTL_POWER_D0) {
 461                         snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 462                         alsa_codec_config->codec_clock_on();
 463                         snd_omap_resume_mixer();
 464                 }
 465         }
 466         return 0;
 467 }
 468
 469 #endif  /* CONFIG_PM */
 470
 471 void snd_omap_alsa_free(snd_card_t * card)
 472 {
 473         struct snd_card_omap_codec *chip = card->private_data;
 474         ADEBUG();
 475
 476         /*
 477          * Turn off codec after it is done.
 478          * Can't do it immediately, since it may still have
 479          * buffered data.
 480          */
 481         schedule_timeout_interruptible(2);
 482
 483         omap_mcbsp_stop(AUDIO_MCBSP);
 484         omap_mcbsp_free(AUDIO_MCBSP);
 485
 486         audio_dma_free(&chip->s[SNDRV_PCM_STREAM_PLAYBACK]);
 487         audio_dma_free(&chip->s[SNDRV_PCM_STREAM_CAPTURE]);
 488 }
 489
 490 /* module init & exit */
 491
 492 /*
 493  * Inits alsa soudcard structure.
 494  * Called by the probe method in codec after function pointers has been set.
 495  */
 496 int snd_omap_alsa_post_probe(struct platform_device *pdev, struct omap_alsa_codec_config *config)
 497 {
 498         int err = 0;
 499         int def_rate;
 500         snd_card_t *card;
 501
 502         ADEBUG();
 503         alsa_codec_config       = config;
 504
 505         alsa_codec_config->codec_clock_setup();
 506         alsa_codec_config->codec_clock_on();
 507
 508         omap_mcbsp_request(AUDIO_MCBSP);
 509         omap_mcbsp_stop(AUDIO_MCBSP);
 510         omap_mcbsp_config(AUDIO_MCBSP, alsa_codec_config->mcbsp_regs_alsa);
 511         omap_mcbsp_start(AUDIO_MCBSP);
 512
 513         if (alsa_codec_config && alsa_codec_config->codec_configure_dev)
 514                 alsa_codec_config->codec_configure_dev();
 515
 516         alsa_codec_config->codec_clock_off();
 517
 518         /* register the soundcard */
 519         card = snd_card_new(-1, id, THIS_MODULE, sizeof(alsa_codec));
 520         if (card == NULL)
 521                 goto nodev1;
 522
 523         alsa_codec = kcalloc(1, sizeof(*alsa_codec), GFP_KERNEL);
 524         if (alsa_codec == NULL)
 525                 goto nodev2;
 526
 527         card->private_data = (void *)alsa_codec;
 528         card->private_free = snd_omap_alsa_free;
 529
 530         alsa_codec->card        = card;
 531         def_rate                = alsa_codec_config->get_default_samplerate();
 532         alsa_codec->samplerate  = def_rate;
 533
 534         spin_lock_init(&alsa_codec->s[0].dma_lock);
 535         spin_lock_init(&alsa_codec->s[1].dma_lock);
 536
 537         /* mixer */
 538         if ((err = snd_omap_mixer(alsa_codec)) < 0)
 539                 goto nodev3;
 540
 541         /* PCM */
 542         if ((err = snd_card_omap_alsa_pcm(alsa_codec, 0)) < 0)
 543                 goto nodev3;
 544
 545         strcpy(card->driver, "OMAP_ALSA");
 546         strcpy(card->shortname, alsa_codec_config->name);
 547         sprintf(card->longname, alsa_codec_config->name);
 548
 549         snd_omap_init_mixer();
 550         snd_card_set_dev(card, &pdev->dev);
 551
 552         if ((err = snd_card_register(card)) == 0) {
 553                 printk(KERN_INFO "audio support initialized\n");
 554                 platform_set_drvdata(pdev, card);
 555                 return 0;
 556         }
 557
 558 nodev3:
 559         kfree(alsa_codec);
 560 nodev2:
 561         snd_card_free(card);
 562 nodev1:
 563         omap_mcbsp_stop(AUDIO_MCBSP);
 564         omap_mcbsp_free(AUDIO_MCBSP);
 565
 566         return err;
 567 }
 568
 569 int snd_omap_alsa_remove(struct platform_device *pdev)
 570 {
 571         snd_card_t *card = platform_get_drvdata(pdev);
 572         struct snd_card_omap_codec *chip = card->private_data;
 573
 574         snd_card_free(card);
 575
 576         alsa_codec = NULL;
 577         card->private_data = NULL;
 578         kfree(chip);
 579
 580         platform_set_drvdata(pdev, NULL);
 581
 582         return 0;
 583 }