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ASoC: blackfin: bf5xx-i2s: Add support for TDM mode
The bf5xx-i2s{,-pcm} and bf5xx-tdm{-pcm} drivers are nearly identical. Both are
for the same hardware each supporting a slight different subset of the hardware.
The bf5xx-i2s driver supports 2 channel I2S mode while the bf5xx-tdm driver
supports TDM mode and channel remapping. This patch adds support for TDM mode
and channel remapping to the bf5xx-i2s driver so that we'll eventually be able
to retire the bf5xx-tdm driver. Unfortunately the hardware is fixed to using 8
channels in TDM mode. The bf5xx-tdm driver jumps through a few hoops to make it
work well with other channel counts as well:
* Don't support mmap
* Translate between internal frame size (which is always 8 * sample_size)
and ALSA frame size (which depends on the channel count)
* Have special copy and silence callbacks which are aware of the mismatch
between internal and ALSA frame size
* Reduce the maximum buffer size to ensure that there is enough headroom for
dummy data.
The bf5xx-i2s driver is going to use the same mechanisms when being used int
TDM mode.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Lars-Peter Clausen
Mark Brown
parent
a3935a29f6
commit
8b5e2e396b
@ -40,6 +40,7 @@
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#include <asm/dma.h>
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#include "bf5xx-sport.h"
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#include "bf5xx-i2s-pcm.h"
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static void bf5xx_dma_irq(void *data)
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{
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@ -49,7 +50,6 @@ static void bf5xx_dma_irq(void *data)
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static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_BLOCK_TRANSFER,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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@ -66,7 +66,16 @@ static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
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static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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unsigned int buffer_size = params_buffer_bytes(params);
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struct bf5xx_i2s_pcm_data *dma_data;
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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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if (dma_data->tdm_mode)
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buffer_size = buffer_size / params_channels(params) * 8;
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return snd_pcm_lib_malloc_pages(substream, buffer_size);
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}
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static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
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@ -78,9 +87,16 @@ static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
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static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sport_device *sport = runtime->private_data;
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int period_bytes = frames_to_bytes(runtime, runtime->period_size);
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struct bf5xx_i2s_pcm_data *dma_data;
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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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if (dma_data->tdm_mode)
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period_bytes = period_bytes / runtime->channels * 8;
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pr_debug("%s enter\n", __func__);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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@ -127,10 +143,15 @@ static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sport_device *sport = runtime->private_data;
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unsigned int diff;
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snd_pcm_uframes_t frames;
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struct bf5xx_i2s_pcm_data *dma_data;
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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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pr_debug("%s enter\n", __func__);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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diff = sport_curr_offset_tx(sport);
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@ -147,6 +168,8 @@ static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
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diff = 0;
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frames = bytes_to_frames(substream->runtime, diff);
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if (dma_data->tdm_mode)
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frames = frames * runtime->channels / 8;
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return frames;
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}
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@ -158,11 +181,18 @@ static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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struct bf5xx_i2s_pcm_data *dma_data;
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int ret;
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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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pr_debug("%s enter\n", __func__);
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snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
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if (dma_data->tdm_mode)
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runtime->hw.buffer_bytes_max /= 4;
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else
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runtime->hw.info |= SNDRV_PCM_INFO_MMAP;
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ret = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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@ -198,6 +228,88 @@ static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
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return 0 ;
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}
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static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
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snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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unsigned int sample_size = runtime->sample_bits / 8;
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struct bf5xx_i2s_pcm_data *dma_data;
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unsigned int i;
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void *src, *dst;
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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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if (dma_data->tdm_mode) {
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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src = buf;
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dst = runtime->dma_area;
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dst += pos * sample_size * 8;
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while (count--) {
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for (i = 0; i < runtime->channels; i++) {
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memcpy(dst + dma_data->map[i] *
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sample_size, src, sample_size);
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src += sample_size;
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}
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dst += 8 * sample_size;
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}
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} else {
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src = runtime->dma_area;
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src += pos * sample_size * 8;
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dst = buf;
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while (count--) {
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for (i = 0; i < runtime->channels; i++) {
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memcpy(dst, src + dma_data->map[i] *
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sample_size, sample_size);
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dst += sample_size;
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}
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src += 8 * sample_size;
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}
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}
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} else {
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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src = buf;
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dst = runtime->dma_area;
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dst += frames_to_bytes(runtime, pos);
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} else {
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src = runtime->dma_area;
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src += frames_to_bytes(runtime, pos);
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dst = buf;
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}
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memcpy(dst, src, frames_to_bytes(runtime, count));
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}
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return 0;
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}
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static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
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int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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unsigned int sample_size = runtime->sample_bits / 8;
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void *buf = runtime->dma_area;
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struct bf5xx_i2s_pcm_data *dma_data;
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unsigned int offset, size;
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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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if (dma_data->tdm_mode) {
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offset = pos * 8 * sample_size;
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size = count * 8 * sample_size;
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} else {
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offset = frames_to_bytes(runtime, pos);
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size = frames_to_bytes(runtime, count);
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}
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snd_pcm_format_set_silence(runtime->format, buf + offset, size);
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return 0;
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}
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static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
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.open = bf5xx_pcm_open,
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.ioctl = snd_pcm_lib_ioctl,
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@ -207,6 +319,8 @@ static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
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.trigger = bf5xx_pcm_trigger,
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.pointer = bf5xx_pcm_pointer,
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.mmap = bf5xx_pcm_mmap,
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.copy = bf5xx_pcm_copy,
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.silence = bf5xx_pcm_silence,
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};
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static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
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17
sound/soc/blackfin/bf5xx-i2s-pcm.h
Normal file
17
sound/soc/blackfin/bf5xx-i2s-pcm.h
Normal file
@ -0,0 +1,17 @@
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _BF5XX_TDM_PCM_H
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#define _BF5XX_TDM_PCM_H
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#define BFIN_TDM_DAI_MAX_SLOTS 8
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struct bf5xx_i2s_pcm_data {
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unsigned int map[BFIN_TDM_DAI_MAX_SLOTS];
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bool tdm_mode;
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};
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#endif
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@ -42,6 +42,7 @@
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#include <linux/gpio.h>
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#include "bf5xx-sport.h"
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#include "bf5xx-i2s-pcm.h"
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struct bf5xx_i2s_port {
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u16 tcr1;
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@ -49,6 +50,13 @@ struct bf5xx_i2s_port {
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u16 tcr2;
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u16 rcr2;
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int configured;
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unsigned int slots;
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unsigned int tx_mask;
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unsigned int rx_mask;
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struct bf5xx_i2s_pcm_data tx_dma_data;
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struct bf5xx_i2s_pcm_data rx_dma_data;
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};
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static int bf5xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
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@ -170,6 +178,64 @@ static void bf5xx_i2s_shutdown(struct snd_pcm_substream *substream,
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bf5xx_i2s->configured = 0;
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}
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static int bf5xx_i2s_set_channel_map(struct snd_soc_dai *dai,
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unsigned int tx_num, unsigned int *tx_slot,
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unsigned int rx_num, unsigned int *rx_slot)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
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struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
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unsigned int tx_mapped = 0, rx_mapped = 0;
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unsigned int slot;
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int i;
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if ((tx_num > BFIN_TDM_DAI_MAX_SLOTS) ||
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(rx_num > BFIN_TDM_DAI_MAX_SLOTS))
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return -EINVAL;
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for (i = 0; i < tx_num; i++) {
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slot = tx_slot[i];
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if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
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(!(tx_mapped & (1 << slot)))) {
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bf5xx_i2s->tx_dma_data.map[i] = slot;
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tx_mapped |= 1 << slot;
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} else
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return -EINVAL;
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}
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for (i = 0; i < rx_num; i++) {
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slot = rx_slot[i];
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if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
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(!(rx_mapped & (1 << slot)))) {
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bf5xx_i2s->rx_dma_data.map[i] = slot;
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rx_mapped |= 1 << slot;
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} else
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return -EINVAL;
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}
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return 0;
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}
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static int bf5xx_i2s_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
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unsigned int rx_mask, int slots, int width)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
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struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
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if (slots % 8 != 0 || slots > 8)
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return -EINVAL;
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if (width != 32)
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return -EINVAL;
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bf5xx_i2s->slots = slots;
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bf5xx_i2s->tx_mask = tx_mask;
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bf5xx_i2s->rx_mask = rx_mask;
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bf5xx_i2s->tx_dma_data.tdm_mode = slots != 0;
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bf5xx_i2s->rx_dma_data.tdm_mode = slots != 0;
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return sport_set_multichannel(sport_handle, slots, tx_mask, rx_mask, 0);
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}
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#ifdef CONFIG_PM
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static int bf5xx_i2s_suspend(struct snd_soc_dai *dai)
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{
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@ -206,7 +272,8 @@ static int bf5xx_i2s_resume(struct snd_soc_dai *dai)
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return -EBUSY;
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}
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return 0;
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return sport_set_multichannel(sport_handle, bf5xx_i2s->slots,
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bf5xx_i2s->tx_mask, bf5xx_i2s->rx_mask, 0);
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}
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#else
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@ -214,6 +281,23 @@ static int bf5xx_i2s_resume(struct snd_soc_dai *dai)
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#define bf5xx_i2s_resume NULL
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#endif
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static int bf5xx_i2s_dai_probe(struct snd_soc_dai *dai)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
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struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
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unsigned int i;
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for (i = 0; i < BFIN_TDM_DAI_MAX_SLOTS; i++) {
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bf5xx_i2s->tx_dma_data.map[i] = i;
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bf5xx_i2s->rx_dma_data.map[i] = i;
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}
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dai->playback_dma_data = &bf5xx_i2s->tx_dma_data;
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dai->capture_dma_data = &bf5xx_i2s->rx_dma_data;
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return 0;
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}
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#define BF5XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
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SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
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SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
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@ -226,22 +310,25 @@ static int bf5xx_i2s_resume(struct snd_soc_dai *dai)
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SNDRV_PCM_FMTBIT_S32_LE)
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static const struct snd_soc_dai_ops bf5xx_i2s_dai_ops = {
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.shutdown = bf5xx_i2s_shutdown,
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.hw_params = bf5xx_i2s_hw_params,
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.set_fmt = bf5xx_i2s_set_dai_fmt,
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.shutdown = bf5xx_i2s_shutdown,
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.hw_params = bf5xx_i2s_hw_params,
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.set_fmt = bf5xx_i2s_set_dai_fmt,
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.set_tdm_slot = bf5xx_i2s_set_tdm_slot,
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.set_channel_map = bf5xx_i2s_set_channel_map,
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};
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static struct snd_soc_dai_driver bf5xx_i2s_dai = {
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.probe = bf5xx_i2s_dai_probe,
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.suspend = bf5xx_i2s_suspend,
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.resume = bf5xx_i2s_resume,
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.playback = {
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.channels_min = 1,
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.channels_max = 2,
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.channels_min = 2,
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.channels_max = 8,
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.rates = BF5XX_I2S_RATES,
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.formats = BF5XX_I2S_FORMATS,},
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.capture = {
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.channels_min = 1,
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.channels_max = 2,
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.channels_min = 2,
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.channels_max = 8,
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.rates = BF5XX_I2S_RATES,
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.formats = BF5XX_I2S_FORMATS,},
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.ops = &bf5xx_i2s_dai_ops,
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@ -257,7 +344,7 @@ static int bf5xx_i2s_probe(struct platform_device *pdev)
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int ret;
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/* configure SPORT for I2S */
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sport_handle = sport_init(pdev, 4, 2 * sizeof(u32),
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sport_handle = sport_init(pdev, 4, 8 * sizeof(u32),
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sizeof(struct bf5xx_i2s_port));
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if (!sport_handle)
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return -ENODEV;
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