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 "pxa2xx-pcm.h" 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 = rtd->dai->cpu_dai->dma_data; 29 int ret; 30 31 /* return if this is a bufferless transfer e.g. 32 * codec <--> BT codec or GSM modem -- lg FIXME */ 33 if (!dma) 34 return 0; 35 36 /* this may get called several times by oss emulation 37 * with different params */ 38 if (prtd->params == NULL) { 39 prtd->params = dma; 40 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, 41 pxa2xx_pcm_dma_irq, substream); 42 if (ret < 0) 43 return ret; 44 prtd->dma_ch = ret; 45 } else if (prtd->params != dma) { 46 pxa_free_dma(prtd->dma_ch); 47 prtd->params = dma; 48 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, 49 pxa2xx_pcm_dma_irq, substream); 50 if (ret < 0) 51 return ret; 52 prtd->dma_ch = ret; 53 } 54 55 return __pxa2xx_pcm_hw_params(substream, params); 56 } 57 58 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) 59 { 60 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; 61 62 __pxa2xx_pcm_hw_free(substream); 63 64 if (prtd->dma_ch) { 65 pxa_free_dma(prtd->dma_ch); 66 prtd->dma_ch = 0; 67 } 68 69 return 0; 70 } 71 72 struct snd_pcm_ops pxa2xx_pcm_ops = { 73 .open = __pxa2xx_pcm_open, 74 .close = __pxa2xx_pcm_close, 75 .ioctl = snd_pcm_lib_ioctl, 76 .hw_params = pxa2xx_pcm_hw_params, 77 .hw_free = pxa2xx_pcm_hw_free, 78 .prepare = __pxa2xx_pcm_prepare, 79 .trigger = pxa2xx_pcm_trigger, 80 .pointer = pxa2xx_pcm_pointer, 81 .mmap = pxa2xx_pcm_mmap, 82 }; 83 84 static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK; 85 86 static int pxa2xx_soc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, 87 struct snd_pcm *pcm) 88 { 89 int ret = 0; 90 91 if (!card->dev->dma_mask) 92 card->dev->dma_mask = &pxa2xx_pcm_dmamask; 93 if (!card->dev->coherent_dma_mask) 94 card->dev->coherent_dma_mask = DMA_32BIT_MASK; 95 96 if (dai->playback.channels_min) { 97 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 98 SNDRV_PCM_STREAM_PLAYBACK); 99 if (ret) 100 goto out; 101 } 102 103 if (dai->capture.channels_min) { 104 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 105 SNDRV_PCM_STREAM_CAPTURE); 106 if (ret) 107 goto out; 108 } 109 out: 110 return ret; 111 } 112 113 struct snd_soc_platform pxa2xx_soc_platform = { 114 .name = "pxa2xx-audio", 115 .pcm_ops = &pxa2xx_pcm_ops, 116 .pcm_new = pxa2xx_soc_pcm_new, 117 .pcm_free = pxa2xx_pcm_free_dma_buffers, 118 }; 119 EXPORT_SYMBOL_GPL(pxa2xx_soc_platform); 120 121 MODULE_AUTHOR("Nicolas Pitre"); 122 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); 123 MODULE_LICENSE("GPL"); 124