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 15 #include <sound/core.h> 16 #include <sound/soc.h> 17 #include <sound/pxa2xx-lib.h> 18 19 #include "../../arm/pxa2xx-pcm.h" 20 21 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, 22 struct snd_pcm_hw_params *params) 23 { 24 struct snd_pcm_runtime *runtime = substream->runtime; 25 struct pxa2xx_runtime_data *prtd = runtime->private_data; 26 struct snd_soc_pcm_runtime *rtd = substream->private_data; 27 struct pxa2xx_pcm_dma_params *dma; 28 int ret; 29 30 dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 31 32 /* return if this is a bufferless transfer e.g. 33 * codec <--> BT codec or GSM modem -- lg FIXME */ 34 if (!dma) 35 return 0; 36 37 /* this may get called several times by oss emulation 38 * with different params */ 39 if (prtd->params == NULL) { 40 prtd->params = dma; 41 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, 42 pxa2xx_pcm_dma_irq, substream); 43 if (ret < 0) 44 return ret; 45 prtd->dma_ch = ret; 46 } else if (prtd->params != dma) { 47 pxa_free_dma(prtd->dma_ch); 48 prtd->params = dma; 49 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, 50 pxa2xx_pcm_dma_irq, substream); 51 if (ret < 0) 52 return ret; 53 prtd->dma_ch = ret; 54 } 55 56 return __pxa2xx_pcm_hw_params(substream, params); 57 } 58 59 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) 60 { 61 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; 62 63 __pxa2xx_pcm_hw_free(substream); 64 65 if (prtd->dma_ch >= 0) { 66 pxa_free_dma(prtd->dma_ch); 67 prtd->dma_ch = -1; 68 prtd->params = NULL; 69 } 70 71 return 0; 72 } 73 74 static struct snd_pcm_ops pxa2xx_pcm_ops = { 75 .open = __pxa2xx_pcm_open, 76 .close = __pxa2xx_pcm_close, 77 .ioctl = snd_pcm_lib_ioctl, 78 .hw_params = pxa2xx_pcm_hw_params, 79 .hw_free = pxa2xx_pcm_hw_free, 80 .prepare = __pxa2xx_pcm_prepare, 81 .trigger = pxa2xx_pcm_trigger, 82 .pointer = pxa2xx_pcm_pointer, 83 .mmap = pxa2xx_pcm_mmap, 84 }; 85 86 static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32); 87 88 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd) 89 { 90 struct snd_card *card = rtd->card->snd_card; 91 struct snd_pcm *pcm = rtd->pcm; 92 int ret = 0; 93 94 if (!card->dev->dma_mask) 95 card->dev->dma_mask = &pxa2xx_pcm_dmamask; 96 if (!card->dev->coherent_dma_mask) 97 card->dev->coherent_dma_mask = DMA_BIT_MASK(32); 98 99 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 100 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 101 SNDRV_PCM_STREAM_PLAYBACK); 102 if (ret) 103 goto out; 104 } 105 106 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 107 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 108 SNDRV_PCM_STREAM_CAPTURE); 109 if (ret) 110 goto out; 111 } 112 out: 113 return ret; 114 } 115 116 static struct snd_soc_platform_driver pxa2xx_soc_platform = { 117 .ops = &pxa2xx_pcm_ops, 118 .pcm_new = pxa2xx_soc_pcm_new, 119 .pcm_free = pxa2xx_pcm_free_dma_buffers, 120 }; 121 122 static int __devinit pxa2xx_soc_platform_probe(struct platform_device *pdev) 123 { 124 return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform); 125 } 126 127 static int __devexit pxa2xx_soc_platform_remove(struct platform_device *pdev) 128 { 129 snd_soc_unregister_platform(&pdev->dev); 130 return 0; 131 } 132 133 static struct platform_driver pxa_pcm_driver = { 134 .driver = { 135 .name = "pxa-pcm-audio", 136 .owner = THIS_MODULE, 137 }, 138 139 .probe = pxa2xx_soc_platform_probe, 140 .remove = __devexit_p(pxa2xx_soc_platform_remove), 141 }; 142 143 static int __init snd_pxa_pcm_init(void) 144 { 145 return platform_driver_register(&pxa_pcm_driver); 146 } 147 module_init(snd_pxa_pcm_init); 148 149 static void __exit snd_pxa_pcm_exit(void) 150 { 151 platform_driver_unregister(&pxa_pcm_driver); 152 } 153 module_exit(snd_pxa_pcm_exit); 154 155 MODULE_AUTHOR("Nicolas Pitre"); 156 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); 157 MODULE_LICENSE("GPL"); 158