282 lines
7.0 KiB
C
282 lines
7.0 KiB
C
/*
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* ALSA SoC Synopsys PIO PCM for I2S driver
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*
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* sound/soc/dwc/designware_pcm.c
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*
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* Copyright (C) 2016 Synopsys
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* Jose Abreu <joabreu@synopsys.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/io.h>
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#include <linux/rcupdate.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include "local.h"
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#define BUFFER_BYTES_MAX (3 * 2 * 8 * PERIOD_BYTES_MIN)
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#define PERIOD_BYTES_MIN 4096
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#define PERIODS_MIN 2
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#define dw_pcm_tx_fn(sample_bits) \
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static unsigned int dw_pcm_tx_##sample_bits(struct dw_i2s_dev *dev, \
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struct snd_pcm_runtime *runtime, unsigned int tx_ptr, \
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bool *period_elapsed) \
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{ \
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const u##sample_bits (*p)[2] = (void *)runtime->dma_area; \
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unsigned int period_pos = tx_ptr % runtime->period_size; \
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int i; \
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\
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for (i = 0; i < dev->fifo_th; i++) { \
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iowrite32(p[tx_ptr][0], dev->i2s_base + LRBR_LTHR(0)); \
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iowrite32(p[tx_ptr][1], dev->i2s_base + RRBR_RTHR(0)); \
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period_pos++; \
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if (++tx_ptr >= runtime->buffer_size) \
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tx_ptr = 0; \
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} \
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*period_elapsed = period_pos >= runtime->period_size; \
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return tx_ptr; \
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}
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#define dw_pcm_rx_fn(sample_bits) \
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static unsigned int dw_pcm_rx_##sample_bits(struct dw_i2s_dev *dev, \
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struct snd_pcm_runtime *runtime, unsigned int rx_ptr, \
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bool *period_elapsed) \
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{ \
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u##sample_bits (*p)[2] = (void *)runtime->dma_area; \
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unsigned int period_pos = rx_ptr % runtime->period_size; \
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int i; \
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\
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for (i = 0; i < dev->fifo_th; i++) { \
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p[rx_ptr][0] = ioread32(dev->i2s_base + LRBR_LTHR(0)); \
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p[rx_ptr][1] = ioread32(dev->i2s_base + RRBR_RTHR(0)); \
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period_pos++; \
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if (++rx_ptr >= runtime->buffer_size) \
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rx_ptr = 0; \
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} \
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*period_elapsed = period_pos >= runtime->period_size; \
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return rx_ptr; \
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}
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dw_pcm_tx_fn(16);
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dw_pcm_tx_fn(32);
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dw_pcm_rx_fn(16);
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dw_pcm_rx_fn(32);
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#undef dw_pcm_tx_fn
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#undef dw_pcm_rx_fn
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static const struct snd_pcm_hardware dw_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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.rates = SNDRV_PCM_RATE_32000 |
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SNDRV_PCM_RATE_44100 |
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SNDRV_PCM_RATE_48000,
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.rate_min = 32000,
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.rate_max = 48000,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_LE |
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SNDRV_PCM_FMTBIT_S32_LE,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = BUFFER_BYTES_MAX,
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.period_bytes_min = PERIOD_BYTES_MIN,
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.period_bytes_max = BUFFER_BYTES_MAX / PERIODS_MIN,
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.periods_min = PERIODS_MIN,
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.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
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.fifo_size = 16,
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};
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static void dw_pcm_transfer(struct dw_i2s_dev *dev, bool push)
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{
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struct snd_pcm_substream *substream;
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bool active, period_elapsed;
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rcu_read_lock();
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if (push)
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substream = rcu_dereference(dev->tx_substream);
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else
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substream = rcu_dereference(dev->rx_substream);
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active = substream && snd_pcm_running(substream);
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if (active) {
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unsigned int ptr;
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unsigned int new_ptr;
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if (push) {
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ptr = READ_ONCE(dev->tx_ptr);
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new_ptr = dev->tx_fn(dev, substream->runtime, ptr,
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&period_elapsed);
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cmpxchg(&dev->tx_ptr, ptr, new_ptr);
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} else {
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ptr = READ_ONCE(dev->rx_ptr);
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new_ptr = dev->rx_fn(dev, substream->runtime, ptr,
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&period_elapsed);
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cmpxchg(&dev->rx_ptr, ptr, new_ptr);
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}
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if (period_elapsed)
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snd_pcm_period_elapsed(substream);
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}
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rcu_read_unlock();
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}
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void dw_pcm_push_tx(struct dw_i2s_dev *dev)
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{
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dw_pcm_transfer(dev, true);
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}
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void dw_pcm_pop_rx(struct dw_i2s_dev *dev)
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{
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dw_pcm_transfer(dev, false);
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}
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static int dw_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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snd_soc_set_runtime_hwparams(substream, &dw_pcm_hardware);
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snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
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runtime->private_data = dev;
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return 0;
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}
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static int dw_pcm_close(struct snd_pcm_substream *substream)
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{
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synchronize_rcu();
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return 0;
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}
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static int dw_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct dw_i2s_dev *dev = runtime->private_data;
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int ret;
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switch (params_channels(hw_params)) {
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case 2:
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break;
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default:
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dev_err(dev->dev, "invalid channels number\n");
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return -EINVAL;
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}
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switch (params_format(hw_params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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dev->tx_fn = dw_pcm_tx_16;
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dev->rx_fn = dw_pcm_rx_16;
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break;
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case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_S32_LE:
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dev->tx_fn = dw_pcm_tx_32;
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dev->rx_fn = dw_pcm_rx_32;
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break;
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default:
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dev_err(dev->dev, "invalid format\n");
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return -EINVAL;
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}
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ret = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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if (ret < 0)
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return ret;
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else
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return 0;
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}
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static int dw_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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return snd_pcm_lib_free_pages(substream);
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}
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static int dw_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct dw_i2s_dev *dev = runtime->private_data;
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int ret = 0;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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WRITE_ONCE(dev->tx_ptr, 0);
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rcu_assign_pointer(dev->tx_substream, substream);
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} else {
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WRITE_ONCE(dev->rx_ptr, 0);
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rcu_assign_pointer(dev->rx_substream, substream);
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}
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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rcu_assign_pointer(dev->tx_substream, NULL);
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else
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rcu_assign_pointer(dev->rx_substream, NULL);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static snd_pcm_uframes_t dw_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct dw_i2s_dev *dev = runtime->private_data;
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snd_pcm_uframes_t pos;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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pos = READ_ONCE(dev->tx_ptr);
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else
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pos = READ_ONCE(dev->rx_ptr);
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return pos < runtime->buffer_size ? pos : 0;
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}
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static int dw_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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size_t size = dw_pcm_hardware.buffer_bytes_max;
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return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
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SNDRV_DMA_TYPE_CONTINUOUS,
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snd_dma_continuous_data(GFP_KERNEL), size, size);
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}
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static void dw_pcm_free(struct snd_pcm *pcm)
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{
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snd_pcm_lib_preallocate_free_for_all(pcm);
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}
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static const struct snd_pcm_ops dw_pcm_ops = {
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.open = dw_pcm_open,
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.close = dw_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = dw_pcm_hw_params,
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.hw_free = dw_pcm_hw_free,
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.trigger = dw_pcm_trigger,
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.pointer = dw_pcm_pointer,
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};
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static const struct snd_soc_platform_driver dw_pcm_platform = {
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.pcm_new = dw_pcm_new,
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.pcm_free = dw_pcm_free,
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.ops = &dw_pcm_ops,
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};
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int dw_pcm_register(struct platform_device *pdev)
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{
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return devm_snd_soc_register_platform(&pdev->dev, &dw_pcm_platform);
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}
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