374 lines
10 KiB
C
374 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright 2011 Broadcom Corporation. All rights reserved. */
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <sound/asoundef.h>
|
|
|
|
#include "bcm2835.h"
|
|
|
|
/* hardware definition */
|
|
static const struct snd_pcm_hardware snd_bcm2835_playback_hw = {
|
|
.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
|
|
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
|
|
SNDRV_PCM_INFO_SYNC_APPLPTR),
|
|
.formats = SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
|
|
.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
|
|
.rate_min = 8000,
|
|
.rate_max = 48000,
|
|
.channels_min = 1,
|
|
.channels_max = 2,
|
|
.buffer_bytes_max = 128 * 1024,
|
|
.period_bytes_min = 1 * 1024,
|
|
.period_bytes_max = 128 * 1024,
|
|
.periods_min = 1,
|
|
.periods_max = 128,
|
|
};
|
|
|
|
static const struct snd_pcm_hardware snd_bcm2835_playback_spdif_hw = {
|
|
.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
|
|
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
|
|
SNDRV_PCM_INFO_SYNC_APPLPTR),
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE,
|
|
.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_44100 |
|
|
SNDRV_PCM_RATE_48000,
|
|
.rate_min = 44100,
|
|
.rate_max = 48000,
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.buffer_bytes_max = 128 * 1024,
|
|
.period_bytes_min = 1 * 1024,
|
|
.period_bytes_max = 128 * 1024,
|
|
.periods_min = 1,
|
|
.periods_max = 128,
|
|
};
|
|
|
|
static void snd_bcm2835_playback_free(struct snd_pcm_runtime *runtime)
|
|
{
|
|
kfree(runtime->private_data);
|
|
}
|
|
|
|
void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream,
|
|
unsigned int bytes)
|
|
{
|
|
struct snd_pcm_substream *substream = alsa_stream->substream;
|
|
unsigned int pos;
|
|
|
|
if (!alsa_stream->period_size)
|
|
return;
|
|
|
|
if (bytes >= alsa_stream->buffer_size) {
|
|
snd_pcm_stream_lock(substream);
|
|
snd_pcm_stop(substream,
|
|
alsa_stream->draining ?
|
|
SNDRV_PCM_STATE_SETUP :
|
|
SNDRV_PCM_STATE_XRUN);
|
|
snd_pcm_stream_unlock(substream);
|
|
return;
|
|
}
|
|
|
|
pos = atomic_read(&alsa_stream->pos);
|
|
pos += bytes;
|
|
pos %= alsa_stream->buffer_size;
|
|
atomic_set(&alsa_stream->pos, pos);
|
|
|
|
alsa_stream->period_offset += bytes;
|
|
alsa_stream->interpolate_start = ktime_get();
|
|
if (alsa_stream->period_offset >= alsa_stream->period_size) {
|
|
alsa_stream->period_offset %= alsa_stream->period_size;
|
|
snd_pcm_period_elapsed(substream);
|
|
}
|
|
}
|
|
|
|
/* open callback */
|
|
static int snd_bcm2835_playback_open_generic(
|
|
struct snd_pcm_substream *substream, int spdif)
|
|
{
|
|
struct bcm2835_chip *chip = snd_pcm_substream_chip(substream);
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct bcm2835_alsa_stream *alsa_stream;
|
|
int idx;
|
|
int err;
|
|
|
|
mutex_lock(&chip->audio_mutex);
|
|
idx = substream->number;
|
|
|
|
if (spdif && chip->opened) {
|
|
err = -EBUSY;
|
|
goto out;
|
|
} else if (!spdif && (chip->opened & (1 << idx))) {
|
|
err = -EBUSY;
|
|
goto out;
|
|
}
|
|
if (idx >= MAX_SUBSTREAMS) {
|
|
dev_err(chip->dev,
|
|
"substream(%d) device doesn't exist max(%d) substreams allowed\n",
|
|
idx, MAX_SUBSTREAMS);
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
alsa_stream = kzalloc(sizeof(*alsa_stream), GFP_KERNEL);
|
|
if (!alsa_stream) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Initialise alsa_stream */
|
|
alsa_stream->chip = chip;
|
|
alsa_stream->substream = substream;
|
|
alsa_stream->idx = idx;
|
|
|
|
err = bcm2835_audio_open(alsa_stream);
|
|
if (err) {
|
|
kfree(alsa_stream);
|
|
goto out;
|
|
}
|
|
runtime->private_data = alsa_stream;
|
|
runtime->private_free = snd_bcm2835_playback_free;
|
|
if (spdif) {
|
|
runtime->hw = snd_bcm2835_playback_spdif_hw;
|
|
} else {
|
|
/* clear spdif status, as we are not in spdif mode */
|
|
chip->spdif_status = 0;
|
|
runtime->hw = snd_bcm2835_playback_hw;
|
|
}
|
|
/* minimum 16 bytes alignment (for vchiq bulk transfers) */
|
|
snd_pcm_hw_constraint_step(runtime,
|
|
0,
|
|
SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
|
|
16);
|
|
|
|
/* position update is in 10ms order */
|
|
snd_pcm_hw_constraint_minmax(runtime,
|
|
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
|
|
10 * 1000, UINT_MAX);
|
|
|
|
chip->alsa_stream[idx] = alsa_stream;
|
|
|
|
chip->opened |= (1 << idx);
|
|
|
|
out:
|
|
mutex_unlock(&chip->audio_mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int snd_bcm2835_playback_open(struct snd_pcm_substream *substream)
|
|
{
|
|
return snd_bcm2835_playback_open_generic(substream, 0);
|
|
}
|
|
|
|
static int snd_bcm2835_playback_spdif_open(struct snd_pcm_substream *substream)
|
|
{
|
|
return snd_bcm2835_playback_open_generic(substream, 1);
|
|
}
|
|
|
|
static int snd_bcm2835_playback_close(struct snd_pcm_substream *substream)
|
|
{
|
|
struct bcm2835_alsa_stream *alsa_stream;
|
|
struct snd_pcm_runtime *runtime;
|
|
struct bcm2835_chip *chip;
|
|
|
|
chip = snd_pcm_substream_chip(substream);
|
|
mutex_lock(&chip->audio_mutex);
|
|
runtime = substream->runtime;
|
|
alsa_stream = runtime->private_data;
|
|
|
|
alsa_stream->period_size = 0;
|
|
alsa_stream->buffer_size = 0;
|
|
|
|
bcm2835_audio_close(alsa_stream);
|
|
alsa_stream->chip->alsa_stream[alsa_stream->idx] = NULL;
|
|
/*
|
|
* Do not free up alsa_stream here, it will be freed up by
|
|
* runtime->private_free callback we registered in *_open above
|
|
*/
|
|
|
|
chip->opened &= ~(1 << substream->number);
|
|
|
|
mutex_unlock(&chip->audio_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_bcm2835_pcm_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
|
|
}
|
|
|
|
static int snd_bcm2835_pcm_hw_free(struct snd_pcm_substream *substream)
|
|
{
|
|
return snd_pcm_lib_free_pages(substream);
|
|
}
|
|
|
|
static int snd_bcm2835_pcm_prepare(struct snd_pcm_substream *substream)
|
|
{
|
|
struct bcm2835_chip *chip = snd_pcm_substream_chip(substream);
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
|
|
int channels;
|
|
int err;
|
|
|
|
/* notify the vchiq that it should enter spdif passthrough mode by
|
|
* setting channels=0 (see
|
|
* https://github.com/raspberrypi/linux/issues/528)
|
|
*/
|
|
if (chip->spdif_status & IEC958_AES0_NONAUDIO)
|
|
channels = 0;
|
|
else
|
|
channels = runtime->channels;
|
|
|
|
err = bcm2835_audio_set_params(alsa_stream, channels,
|
|
runtime->rate,
|
|
snd_pcm_format_width(runtime->format));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
memset(&alsa_stream->pcm_indirect, 0, sizeof(alsa_stream->pcm_indirect));
|
|
|
|
alsa_stream->pcm_indirect.hw_buffer_size =
|
|
alsa_stream->pcm_indirect.sw_buffer_size =
|
|
snd_pcm_lib_buffer_bytes(substream);
|
|
|
|
alsa_stream->buffer_size = snd_pcm_lib_buffer_bytes(substream);
|
|
alsa_stream->period_size = snd_pcm_lib_period_bytes(substream);
|
|
atomic_set(&alsa_stream->pos, 0);
|
|
alsa_stream->period_offset = 0;
|
|
alsa_stream->draining = false;
|
|
alsa_stream->interpolate_start = ktime_get();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void snd_bcm2835_pcm_transfer(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_indirect *rec, size_t bytes)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
|
|
void *src = (void *) (substream->runtime->dma_area + rec->sw_data);
|
|
|
|
bcm2835_audio_write(alsa_stream, bytes, src);
|
|
}
|
|
|
|
static int snd_bcm2835_pcm_ack(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
|
|
struct snd_pcm_indirect *pcm_indirect = &alsa_stream->pcm_indirect;
|
|
|
|
return snd_pcm_indirect_playback_transfer(substream, pcm_indirect,
|
|
snd_bcm2835_pcm_transfer);
|
|
}
|
|
|
|
/* trigger callback */
|
|
static int snd_bcm2835_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
return bcm2835_audio_start(alsa_stream);
|
|
case SNDRV_PCM_TRIGGER_DRAIN:
|
|
alsa_stream->draining = true;
|
|
return bcm2835_audio_drain(alsa_stream);
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
return bcm2835_audio_stop(alsa_stream);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/* pointer callback */
|
|
static snd_pcm_uframes_t
|
|
snd_bcm2835_pcm_pointer(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
|
|
ktime_t now = ktime_get();
|
|
|
|
/* Give userspace better delay reporting by interpolating between GPU
|
|
* notifications, assuming audio speed is close enough to the clock
|
|
* used for ktime
|
|
*/
|
|
|
|
if ((ktime_to_ns(alsa_stream->interpolate_start)) &&
|
|
(ktime_compare(alsa_stream->interpolate_start, now) < 0)) {
|
|
u64 interval =
|
|
(ktime_to_ns(ktime_sub(now,
|
|
alsa_stream->interpolate_start)));
|
|
u64 frames_output_in_interval =
|
|
div_u64((interval * runtime->rate), 1000000000);
|
|
snd_pcm_sframes_t frames_output_in_interval_sized =
|
|
-frames_output_in_interval;
|
|
runtime->delay = frames_output_in_interval_sized;
|
|
}
|
|
|
|
return snd_pcm_indirect_playback_pointer(substream,
|
|
&alsa_stream->pcm_indirect,
|
|
atomic_read(&alsa_stream->pos));
|
|
}
|
|
|
|
/* operators */
|
|
static const struct snd_pcm_ops snd_bcm2835_playback_ops = {
|
|
.open = snd_bcm2835_playback_open,
|
|
.close = snd_bcm2835_playback_close,
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
.hw_params = snd_bcm2835_pcm_hw_params,
|
|
.hw_free = snd_bcm2835_pcm_hw_free,
|
|
.prepare = snd_bcm2835_pcm_prepare,
|
|
.trigger = snd_bcm2835_pcm_trigger,
|
|
.pointer = snd_bcm2835_pcm_pointer,
|
|
.ack = snd_bcm2835_pcm_ack,
|
|
};
|
|
|
|
static const struct snd_pcm_ops snd_bcm2835_playback_spdif_ops = {
|
|
.open = snd_bcm2835_playback_spdif_open,
|
|
.close = snd_bcm2835_playback_close,
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
.hw_params = snd_bcm2835_pcm_hw_params,
|
|
.hw_free = snd_bcm2835_pcm_hw_free,
|
|
.prepare = snd_bcm2835_pcm_prepare,
|
|
.trigger = snd_bcm2835_pcm_trigger,
|
|
.pointer = snd_bcm2835_pcm_pointer,
|
|
.ack = snd_bcm2835_pcm_ack,
|
|
};
|
|
|
|
/* create a pcm device */
|
|
int snd_bcm2835_new_pcm(struct bcm2835_chip *chip, const char *name,
|
|
int idx, enum snd_bcm2835_route route,
|
|
u32 numchannels, bool spdif)
|
|
{
|
|
struct snd_pcm *pcm;
|
|
int err;
|
|
|
|
err = snd_pcm_new(chip->card, name, idx, numchannels, 0, &pcm);
|
|
if (err)
|
|
return err;
|
|
|
|
pcm->private_data = chip;
|
|
pcm->nonatomic = true;
|
|
strscpy(pcm->name, name, sizeof(pcm->name));
|
|
if (!spdif) {
|
|
chip->dest = route;
|
|
chip->volume = 0;
|
|
chip->mute = CTRL_VOL_UNMUTE;
|
|
}
|
|
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
|
|
spdif ? &snd_bcm2835_playback_spdif_ops :
|
|
&snd_bcm2835_playback_ops);
|
|
|
|
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
|
|
chip->card->dev, 128 * 1024, 128 * 1024);
|
|
|
|
if (spdif)
|
|
chip->pcm_spdif = pcm;
|
|
else
|
|
chip->pcm = pcm;
|
|
return 0;
|
|
}
|