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 <mach/dma.h> 19 20 #include <sound/core.h> 21 #include <sound/soc.h> 22 #include <sound/pxa2xx-lib.h> 23 #include <sound/dmaengine_pcm.h> 24 25 #include "../../arm/pxa2xx-pcm.h" 26 27 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, 28 struct snd_pcm_hw_params *params) 29 { 30 struct snd_pcm_runtime *runtime = substream->runtime; 31 struct pxa2xx_runtime_data *prtd = runtime->private_data; 32 struct snd_soc_pcm_runtime *rtd = substream->private_data; 33 struct snd_dmaengine_dai_dma_data *dma; 34 int ret; 35 36 dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 37 38 /* return if this is a bufferless transfer e.g. 39 * codec <--> BT codec or GSM modem -- lg FIXME */ 40 if (!dma) 41 return 0; 42 43 /* this may get called several times by oss emulation 44 * with different params */ 45 if (prtd->params == NULL) { 46 prtd->params = dma; 47 ret = pxa_request_dma("name", DMA_PRIO_LOW, 48 pxa2xx_pcm_dma_irq, substream); 49 if (ret < 0) 50 return ret; 51 prtd->dma_ch = ret; 52 } else if (prtd->params != dma) { 53 pxa_free_dma(prtd->dma_ch); 54 prtd->params = dma; 55 ret = pxa_request_dma("name", DMA_PRIO_LOW, 56 pxa2xx_pcm_dma_irq, substream); 57 if (ret < 0) 58 return ret; 59 prtd->dma_ch = ret; 60 } 61 62 return __pxa2xx_pcm_hw_params(substream, params); 63 } 64 65 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) 66 { 67 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; 68 69 __pxa2xx_pcm_hw_free(substream); 70 71 if (prtd->dma_ch >= 0) { 72 pxa_free_dma(prtd->dma_ch); 73 prtd->dma_ch = -1; 74 prtd->params = NULL; 75 } 76 77 return 0; 78 } 79 80 static struct snd_pcm_ops pxa2xx_pcm_ops = { 81 .open = __pxa2xx_pcm_open, 82 .close = __pxa2xx_pcm_close, 83 .ioctl = snd_pcm_lib_ioctl, 84 .hw_params = pxa2xx_pcm_hw_params, 85 .hw_free = pxa2xx_pcm_hw_free, 86 .prepare = __pxa2xx_pcm_prepare, 87 .trigger = pxa2xx_pcm_trigger, 88 .pointer = pxa2xx_pcm_pointer, 89 .mmap = pxa2xx_pcm_mmap, 90 }; 91 92 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd) 93 { 94 struct snd_card *card = rtd->card->snd_card; 95 struct snd_pcm *pcm = rtd->pcm; 96 int ret; 97 98 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 99 if (ret) 100 return ret; 101 102 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 103 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 104 SNDRV_PCM_STREAM_PLAYBACK); 105 if (ret) 106 goto out; 107 } 108 109 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 110 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 111 SNDRV_PCM_STREAM_CAPTURE); 112 if (ret) 113 goto out; 114 } 115 out: 116 return ret; 117 } 118 119 static struct snd_soc_platform_driver pxa2xx_soc_platform = { 120 .ops = &pxa2xx_pcm_ops, 121 .pcm_new = pxa2xx_soc_pcm_new, 122 .pcm_free = pxa2xx_pcm_free_dma_buffers, 123 }; 124 125 static int pxa2xx_soc_platform_probe(struct platform_device *pdev) 126 { 127 return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform); 128 } 129 130 static int pxa2xx_soc_platform_remove(struct platform_device *pdev) 131 { 132 snd_soc_unregister_platform(&pdev->dev); 133 return 0; 134 } 135 136 #ifdef CONFIG_OF 137 static const struct of_device_id snd_soc_pxa_audio_match[] = { 138 { .compatible = "mrvl,pxa-pcm-audio" }, 139 { } 140 }; 141 #endif 142 143 static struct platform_driver pxa_pcm_driver = { 144 .driver = { 145 .name = "pxa-pcm-audio", 146 .owner = THIS_MODULE, 147 .of_match_table = of_match_ptr(snd_soc_pxa_audio_match), 148 }, 149 150 .probe = pxa2xx_soc_platform_probe, 151 .remove = pxa2xx_soc_platform_remove, 152 }; 153 154 module_platform_driver(pxa_pcm_driver); 155 156 MODULE_AUTHOR("Nicolas Pitre"); 157 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); 158 MODULE_LICENSE("GPL"); 159