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1// SPDX-License-Identifier: GPL-2.0-only2 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_t68pxa2xx_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 multiple96 * 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_t186pxa2xx_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");196