1 /* 2 * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip 3 * 4 * Author: Nicolas Pitre 5 * Created: Nov 30, 2004 6 * Copyright: (C) 2004 MontaVista Software, Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/dma-mapping.h> 14 #include <linux/module.h> 15 #include <linux/dmaengine.h> 16 #include <linux/of.h> 17 18 #include <sound/core.h> 19 #include <sound/soc.h> 20 #include <sound/pxa2xx-lib.h> 21 #include <sound/dmaengine_pcm.h> 22 23 #include "../../arm/pxa2xx-pcm.h" 24 25 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, 26 struct snd_pcm_hw_params *params) 27 { 28 struct snd_soc_pcm_runtime *rtd = substream->private_data; 29 struct snd_dmaengine_dai_dma_data *dma; 30 31 dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 32 33 /* return if this is a bufferless transfer e.g. 34 * codec <--> BT codec or GSM modem -- lg FIXME */ 35 if (!dma) 36 return 0; 37 38 return __pxa2xx_pcm_hw_params(substream, params); 39 } 40 41 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) 42 { 43 __pxa2xx_pcm_hw_free(substream); 44 45 return 0; 46 } 47 48 static struct snd_pcm_ops pxa2xx_pcm_ops = { 49 .open = __pxa2xx_pcm_open, 50 .close = __pxa2xx_pcm_close, 51 .ioctl = snd_pcm_lib_ioctl, 52 .hw_params = pxa2xx_pcm_hw_params, 53 .hw_free = pxa2xx_pcm_hw_free, 54 .prepare = __pxa2xx_pcm_prepare, 55 .trigger = pxa2xx_pcm_trigger, 56 .pointer = pxa2xx_pcm_pointer, 57 .mmap = pxa2xx_pcm_mmap, 58 }; 59 60 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd) 61 { 62 struct snd_card *card = rtd->card->snd_card; 63 struct snd_pcm *pcm = rtd->pcm; 64 int ret; 65 66 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 67 if (ret) 68 return ret; 69 70 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 71 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 72 SNDRV_PCM_STREAM_PLAYBACK); 73 if (ret) 74 goto out; 75 } 76 77 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 78 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 79 SNDRV_PCM_STREAM_CAPTURE); 80 if (ret) 81 goto out; 82 } 83 out: 84 return ret; 85 } 86 87 static struct snd_soc_platform_driver pxa2xx_soc_platform = { 88 .ops = &pxa2xx_pcm_ops, 89 .pcm_new = pxa2xx_soc_pcm_new, 90 .pcm_free = pxa2xx_pcm_free_dma_buffers, 91 }; 92 93 static int pxa2xx_soc_platform_probe(struct platform_device *pdev) 94 { 95 return devm_snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform); 96 } 97 98 #ifdef CONFIG_OF 99 static const struct of_device_id snd_soc_pxa_audio_match[] = { 100 { .compatible = "mrvl,pxa-pcm-audio" }, 101 { } 102 }; 103 MODULE_DEVICE_TABLE(of, snd_soc_pxa_audio_match); 104 #endif 105 106 static struct platform_driver pxa_pcm_driver = { 107 .driver = { 108 .name = "pxa-pcm-audio", 109 .of_match_table = of_match_ptr(snd_soc_pxa_audio_match), 110 }, 111 112 .probe = pxa2xx_soc_platform_probe, 113 }; 114 115 module_platform_driver(pxa_pcm_driver); 116 117 MODULE_AUTHOR("Nicolas Pitre"); 118 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); 119 MODULE_LICENSE("GPL"); 120 MODULE_ALIAS("platform:pxa-pcm-audio"); 121