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_pcm_runtime *runtime = substream->runtime; 29 struct pxa2xx_runtime_data *prtd = runtime->private_data; 30 struct snd_soc_pcm_runtime *rtd = substream->private_data; 31 struct snd_dmaengine_dai_dma_data *dma; 32 int ret; 33 34 dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 35 36 /* return if this is a bufferless transfer e.g. 37 * codec <--> BT codec or GSM modem -- lg FIXME */ 38 if (!dma) 39 return 0; 40 41 /* this may get called several times by oss emulation 42 * with different params */ 43 if (prtd->params == NULL) { 44 prtd->params = dma; 45 ret = pxa_request_dma("name", DMA_PRIO_LOW, 46 pxa2xx_pcm_dma_irq, substream); 47 if (ret < 0) 48 return ret; 49 prtd->dma_ch = ret; 50 } else if (prtd->params != dma) { 51 pxa_free_dma(prtd->dma_ch); 52 prtd->params = dma; 53 ret = pxa_request_dma("name", DMA_PRIO_LOW, 54 pxa2xx_pcm_dma_irq, substream); 55 if (ret < 0) 56 return ret; 57 prtd->dma_ch = ret; 58 } 59 60 return __pxa2xx_pcm_hw_params(substream, params); 61 } 62 63 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) 64 { 65 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; 66 67 __pxa2xx_pcm_hw_free(substream); 68 69 if (prtd->dma_ch >= 0) { 70 pxa_free_dma(prtd->dma_ch); 71 prtd->dma_ch = -1; 72 prtd->params = NULL; 73 } 74 75 return 0; 76 } 77 78 static struct snd_pcm_ops pxa2xx_pcm_ops = { 79 .open = __pxa2xx_pcm_open, 80 .close = __pxa2xx_pcm_close, 81 .ioctl = snd_pcm_lib_ioctl, 82 .hw_params = pxa2xx_pcm_hw_params, 83 .hw_free = pxa2xx_pcm_hw_free, 84 .prepare = __pxa2xx_pcm_prepare, 85 .trigger = pxa2xx_pcm_trigger, 86 .pointer = pxa2xx_pcm_pointer, 87 .mmap = pxa2xx_pcm_mmap, 88 }; 89 90 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd) 91 { 92 struct snd_card *card = rtd->card->snd_card; 93 struct snd_pcm *pcm = rtd->pcm; 94 int ret; 95 96 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 97 if (ret) 98 return ret; 99 100 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 101 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 102 SNDRV_PCM_STREAM_PLAYBACK); 103 if (ret) 104 goto out; 105 } 106 107 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 108 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 109 SNDRV_PCM_STREAM_CAPTURE); 110 if (ret) 111 goto out; 112 } 113 out: 114 return ret; 115 } 116 117 static struct snd_soc_platform_driver pxa2xx_soc_platform = { 118 .ops = &pxa2xx_pcm_ops, 119 .pcm_new = pxa2xx_soc_pcm_new, 120 .pcm_free = pxa2xx_pcm_free_dma_buffers, 121 }; 122 123 static int pxa2xx_soc_platform_probe(struct platform_device *pdev) 124 { 125 return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform); 126 } 127 128 static int pxa2xx_soc_platform_remove(struct platform_device *pdev) 129 { 130 snd_soc_unregister_platform(&pdev->dev); 131 return 0; 132 } 133 134 #ifdef CONFIG_OF 135 static const struct of_device_id snd_soc_pxa_audio_match[] = { 136 { .compatible = "mrvl,pxa-pcm-audio" }, 137 { } 138 }; 139 #endif 140 141 static struct platform_driver pxa_pcm_driver = { 142 .driver = { 143 .name = "pxa-pcm-audio", 144 .owner = THIS_MODULE, 145 .of_match_table = of_match_ptr(snd_soc_pxa_audio_match), 146 }, 147 148 .probe = pxa2xx_soc_platform_probe, 149 .remove = pxa2xx_soc_platform_remove, 150 }; 151 152 module_platform_driver(pxa_pcm_driver); 153 154 MODULE_AUTHOR("Nicolas Pitre"); 155 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); 156 MODULE_LICENSE("GPL"); 157