pxa2xx-pcm-lib.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2
  3#include <linux/slab.h>
  4#include <linux/module.h>
  5#include <linux/dma-mapping.h>
  6#include <linux/dmaengine.h>
  7#include <linux/dma/pxa-dma.h>
  8
  9#include <sound/core.h>
 10#include <sound/pcm.h>
 11#include <sound/pcm_params.h>
 12#include <sound/pxa2xx-lib.h>
 13#include <sound/dmaengine_pcm.h>
 14
 15static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
 16	.info			= SNDRV_PCM_INFO_MMAP |
 17				  SNDRV_PCM_INFO_MMAP_VALID |
 18				  SNDRV_PCM_INFO_INTERLEAVED |
 19				  SNDRV_PCM_INFO_PAUSE |
 20				  SNDRV_PCM_INFO_RESUME,
 21	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
 22				  SNDRV_PCM_FMTBIT_S24_LE |
 23				  SNDRV_PCM_FMTBIT_S32_LE,
 24	.period_bytes_min	= 32,
 25	.period_bytes_max	= 8192 - 32,
 26	.periods_min		= 1,
 27	.periods_max		= 256,
 28	.buffer_bytes_max	= 128 * 1024,
 29	.fifo_size		= 32,
 30};
 31
 32int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
 33			 struct snd_pcm_hw_params *params)
 34{
 35	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
 36	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 37	struct snd_dmaengine_dai_dma_data *dma_params;
 38	struct dma_slave_config config;
 39	int ret;
 40
 41	dma_params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
 42	if (!dma_params)
 43		return 0;
 44
 45	ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
 46	if (ret)
 47		return ret;
 48
 49	snd_dmaengine_pcm_set_config_from_dai_data(substream,
 50			snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream),
 51			&config);
 52
 53	ret = dmaengine_slave_config(chan, &config);
 54	if (ret)
 55		return ret;
 56
 57	return 0;
 58}
 59EXPORT_SYMBOL(pxa2xx_pcm_hw_params);
 60
 61int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 62{
 63	return snd_dmaengine_pcm_trigger(substream, cmd);
 64}
 65EXPORT_SYMBOL(pxa2xx_pcm_trigger);
 66
 67snd_pcm_uframes_t
 68pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
 69{
 70	return snd_dmaengine_pcm_pointer(substream);
 71}
 72EXPORT_SYMBOL(pxa2xx_pcm_pointer);
 73
 74int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
 75{
 76	return 0;
 77}
 78EXPORT_SYMBOL(pxa2xx_pcm_prepare);
 79
 80int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
 81{
 82	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 83	struct snd_pcm_runtime *runtime = substream->runtime;
 84	struct snd_dmaengine_dai_dma_data *dma_params;
 85	int ret;
 86
 87	runtime->hw = pxa2xx_pcm_hardware;
 88
 89	dma_params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
 90	if (!dma_params)
 91		return 0;
 92
 93	/*
 94	 * For mysterious reasons (and despite what the manual says)
 95	 * playback samples are lost if the DMA count is not a multiple
 96	 * of the DMA burst size.  Let's add a rule to enforce that.
 97	 */
 98	ret = snd_pcm_hw_constraint_step(runtime, 0,
 99		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
100	if (ret)
101		return ret;
102
103	ret = snd_pcm_hw_constraint_step(runtime, 0,
104		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
105	if (ret)
106		return ret;
107
108	ret = snd_pcm_hw_constraint_integer(runtime,
109					    SNDRV_PCM_HW_PARAM_PERIODS);
110	if (ret < 0)
111		return ret;
112
113	return snd_dmaengine_pcm_open(
114		substream, dma_request_slave_channel(snd_soc_rtd_to_cpu(rtd, 0)->dev,
115						     dma_params->chan_name));
116}
117EXPORT_SYMBOL(pxa2xx_pcm_open);
118
119int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
120{
121	return snd_dmaengine_pcm_close_release_chan(substream);
122}
123EXPORT_SYMBOL(pxa2xx_pcm_close);
124
125int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm)
126{
127	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
128
129	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
130					    pcm->card->dev, size);
131}
132EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
133
134int pxa2xx_soc_pcm_new(struct snd_soc_component *component,
135		       struct snd_soc_pcm_runtime *rtd)
136{
137	struct snd_card *card = rtd->card->snd_card;
138	struct snd_pcm *pcm = rtd->pcm;
139	int ret;
140
141	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
142	if (ret)
143		return ret;
144
145	return pxa2xx_pcm_preallocate_dma_buffer(pcm);
146}
147EXPORT_SYMBOL(pxa2xx_soc_pcm_new);
148
149int pxa2xx_soc_pcm_open(struct snd_soc_component *component,
150			struct snd_pcm_substream *substream)
151{
152	return pxa2xx_pcm_open(substream);
153}
154EXPORT_SYMBOL(pxa2xx_soc_pcm_open);
155
156int pxa2xx_soc_pcm_close(struct snd_soc_component *component,
157			 struct snd_pcm_substream *substream)
158{
159	return pxa2xx_pcm_close(substream);
160}
161EXPORT_SYMBOL(pxa2xx_soc_pcm_close);
162
163int pxa2xx_soc_pcm_hw_params(struct snd_soc_component *component,
164			     struct snd_pcm_substream *substream,
165			     struct snd_pcm_hw_params *params)
166{
167	return pxa2xx_pcm_hw_params(substream, params);
168}
169EXPORT_SYMBOL(pxa2xx_soc_pcm_hw_params);
170
171int pxa2xx_soc_pcm_prepare(struct snd_soc_component *component,
172			   struct snd_pcm_substream *substream)
173{
174	return pxa2xx_pcm_prepare(substream);
175}
176EXPORT_SYMBOL(pxa2xx_soc_pcm_prepare);
177
178int pxa2xx_soc_pcm_trigger(struct snd_soc_component *component,
179			   struct snd_pcm_substream *substream, int cmd)
180{
181	return pxa2xx_pcm_trigger(substream, cmd);
182}
183EXPORT_SYMBOL(pxa2xx_soc_pcm_trigger);
184
185snd_pcm_uframes_t
186pxa2xx_soc_pcm_pointer(struct snd_soc_component *component,
187		       struct snd_pcm_substream *substream)
188{
189	return pxa2xx_pcm_pointer(substream);
190}
191EXPORT_SYMBOL(pxa2xx_soc_pcm_pointer);
192
193MODULE_AUTHOR("Nicolas Pitre");
194MODULE_DESCRIPTION("Intel PXA2xx sound library");
195MODULE_LICENSE("GPL");