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 16 #include <sound/core.h> 17 #include <sound/soc.h> 18 #include <sound/pxa2xx-lib.h> 19 20 #include "../../arm/pxa2xx-pcm.h" 21 22 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, 23 struct snd_pcm_hw_params *params) 24 { 25 struct snd_pcm_runtime *runtime = substream->runtime; 26 struct pxa2xx_runtime_data *prtd = runtime->private_data; 27 struct snd_soc_pcm_runtime *rtd = substream->private_data; 28 struct pxa2xx_pcm_dma_params *dma; 29 int ret; 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 /* this may get called several times by oss emulation 39 * with different params */ 40 if (prtd->params == NULL) { 41 prtd->params = dma; 42 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, 43 pxa2xx_pcm_dma_irq, substream); 44 if (ret < 0) 45 return ret; 46 prtd->dma_ch = ret; 47 } else if (prtd->params != dma) { 48 pxa_free_dma(prtd->dma_ch); 49 prtd->params = dma; 50 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, 51 pxa2xx_pcm_dma_irq, substream); 52 if (ret < 0) 53 return ret; 54 prtd->dma_ch = ret; 55 } 56 57 return __pxa2xx_pcm_hw_params(substream, params); 58 } 59 60 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) 61 { 62 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; 63 64 __pxa2xx_pcm_hw_free(substream); 65 66 if (prtd->dma_ch >= 0) { 67 pxa_free_dma(prtd->dma_ch); 68 prtd->dma_ch = -1; 69 prtd->params = NULL; 70 } 71 72 return 0; 73 } 74 75 static struct snd_pcm_ops pxa2xx_pcm_ops = { 76 .open = __pxa2xx_pcm_open, 77 .close = __pxa2xx_pcm_close, 78 .ioctl = snd_pcm_lib_ioctl, 79 .hw_params = pxa2xx_pcm_hw_params, 80 .hw_free = pxa2xx_pcm_hw_free, 81 .prepare = __pxa2xx_pcm_prepare, 82 .trigger = pxa2xx_pcm_trigger, 83 .pointer = pxa2xx_pcm_pointer, 84 .mmap = pxa2xx_pcm_mmap, 85 }; 86 87 static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32); 88 89 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd) 90 { 91 struct snd_card *card = rtd->card->snd_card; 92 struct snd_pcm *pcm = rtd->pcm; 93 int ret = 0; 94 95 if (!card->dev->dma_mask) 96 card->dev->dma_mask = &pxa2xx_pcm_dmamask; 97 if (!card->dev->coherent_dma_mask) 98 card->dev->coherent_dma_mask = DMA_BIT_MASK(32); 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 __devinit 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 __devexit pxa2xx_soc_platform_remove(struct platform_device *pdev) 129 { 130 snd_soc_unregister_platform(&pdev->dev); 131 return 0; 132 } 133 134 static struct platform_driver pxa_pcm_driver = { 135 .driver = { 136 .name = "pxa-pcm-audio", 137 .owner = THIS_MODULE, 138 }, 139 140 .probe = pxa2xx_soc_platform_probe, 141 .remove = __devexit_p(pxa2xx_soc_platform_remove), 142 }; 143 144 module_platform_driver(pxa_pcm_driver); 145 146 MODULE_AUTHOR("Nicolas Pitre"); 147 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); 148 MODULE_LICENSE("GPL"); 149