1f11a96d5SLiam Girdwood /* 2f11a96d5SLiam Girdwood * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip 3f11a96d5SLiam Girdwood * 4f11a96d5SLiam Girdwood * Author: Nicolas Pitre 5f11a96d5SLiam Girdwood * Created: Nov 30, 2004 6f11a96d5SLiam Girdwood * Copyright: (C) 2004 MontaVista Software, Inc. 7f11a96d5SLiam Girdwood * 8f11a96d5SLiam Girdwood * This program is free software; you can redistribute it and/or modify 9f11a96d5SLiam Girdwood * it under the terms of the GNU General Public License version 2 as 10f11a96d5SLiam Girdwood * published by the Free Software Foundation. 11f11a96d5SLiam Girdwood */ 12f11a96d5SLiam Girdwood 13f11a96d5SLiam Girdwood #include <linux/dma-mapping.h> 14da155d5bSPaul Gortmaker #include <linux/module.h> 15d65a1458SDaniel Mack #include <linux/dmaengine.h> 16f11a96d5SLiam Girdwood 17f11a96d5SLiam Girdwood #include <sound/core.h> 18f11a96d5SLiam Girdwood #include <sound/soc.h> 19a6d77317SDmitry Baryshkov #include <sound/pxa2xx-lib.h> 20d65a1458SDaniel Mack #include <sound/dmaengine_pcm.h> 21f11a96d5SLiam Girdwood 22a6d77317SDmitry Baryshkov #include "../../arm/pxa2xx-pcm.h" 23f11a96d5SLiam Girdwood 24f11a96d5SLiam Girdwood static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, 25f11a96d5SLiam Girdwood struct snd_pcm_hw_params *params) 26f11a96d5SLiam Girdwood { 27f11a96d5SLiam Girdwood struct snd_pcm_runtime *runtime = substream->runtime; 28f11a96d5SLiam Girdwood struct pxa2xx_runtime_data *prtd = runtime->private_data; 29f11a96d5SLiam Girdwood struct snd_soc_pcm_runtime *rtd = substream->private_data; 30d65a1458SDaniel Mack struct snd_dmaengine_dai_dma_data *dma; 31f11a96d5SLiam Girdwood int ret; 32f11a96d5SLiam Girdwood 33f0fba2adSLiam Girdwood dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 345f712b2bSDaniel Mack 35a8f5d0a5SAndrew Johnson /* return if this is a bufferless transfer e.g. 36a8f5d0a5SAndrew Johnson * codec <--> BT codec or GSM modem -- lg FIXME */ 37a8f5d0a5SAndrew Johnson if (!dma) 38a8f5d0a5SAndrew Johnson return 0; 39a8f5d0a5SAndrew Johnson 40f11a96d5SLiam Girdwood /* this may get called several times by oss emulation 41f11a96d5SLiam Girdwood * with different params */ 42f11a96d5SLiam Girdwood if (prtd->params == NULL) { 43f11a96d5SLiam Girdwood prtd->params = dma; 44d65a1458SDaniel Mack ret = pxa_request_dma("name", DMA_PRIO_LOW, 45f11a96d5SLiam Girdwood pxa2xx_pcm_dma_irq, substream); 46f11a96d5SLiam Girdwood if (ret < 0) 47f11a96d5SLiam Girdwood return ret; 48f11a96d5SLiam Girdwood prtd->dma_ch = ret; 49f11a96d5SLiam Girdwood } else if (prtd->params != dma) { 50f11a96d5SLiam Girdwood pxa_free_dma(prtd->dma_ch); 51f11a96d5SLiam Girdwood prtd->params = dma; 52d65a1458SDaniel Mack ret = pxa_request_dma("name", DMA_PRIO_LOW, 53f11a96d5SLiam Girdwood pxa2xx_pcm_dma_irq, substream); 54f11a96d5SLiam Girdwood if (ret < 0) 55f11a96d5SLiam Girdwood return ret; 56f11a96d5SLiam Girdwood prtd->dma_ch = ret; 57f11a96d5SLiam Girdwood } 58f11a96d5SLiam Girdwood 59a6d77317SDmitry Baryshkov return __pxa2xx_pcm_hw_params(substream, params); 60f11a96d5SLiam Girdwood } 61f11a96d5SLiam Girdwood 62f11a96d5SLiam Girdwood static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) 63f11a96d5SLiam Girdwood { 64f11a96d5SLiam Girdwood struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; 65f11a96d5SLiam Girdwood 66a6d77317SDmitry Baryshkov __pxa2xx_pcm_hw_free(substream); 67f11a96d5SLiam Girdwood 689bef6489SStephen Ware if (prtd->dma_ch >= 0) { 69f11a96d5SLiam Girdwood pxa_free_dma(prtd->dma_ch); 709bef6489SStephen Ware prtd->dma_ch = -1; 7197c96c07SVasily Khoruzhick prtd->params = NULL; 72f11a96d5SLiam Girdwood } 73f11a96d5SLiam Girdwood 74f11a96d5SLiam Girdwood return 0; 75f11a96d5SLiam Girdwood } 76f11a96d5SLiam Girdwood 770e734ad5SMark Brown static struct snd_pcm_ops pxa2xx_pcm_ops = { 78a6d77317SDmitry Baryshkov .open = __pxa2xx_pcm_open, 79a6d77317SDmitry Baryshkov .close = __pxa2xx_pcm_close, 80f11a96d5SLiam Girdwood .ioctl = snd_pcm_lib_ioctl, 81f11a96d5SLiam Girdwood .hw_params = pxa2xx_pcm_hw_params, 82f11a96d5SLiam Girdwood .hw_free = pxa2xx_pcm_hw_free, 83a6d77317SDmitry Baryshkov .prepare = __pxa2xx_pcm_prepare, 84f11a96d5SLiam Girdwood .trigger = pxa2xx_pcm_trigger, 85f11a96d5SLiam Girdwood .pointer = pxa2xx_pcm_pointer, 86f11a96d5SLiam Girdwood .mmap = pxa2xx_pcm_mmap, 87f11a96d5SLiam Girdwood }; 88f11a96d5SLiam Girdwood 89284901a9SYang Hongyang static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32); 90f11a96d5SLiam Girdwood 91552d1ef6SLiam Girdwood static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd) 92f11a96d5SLiam Girdwood { 93552d1ef6SLiam Girdwood struct snd_card *card = rtd->card->snd_card; 94552d1ef6SLiam Girdwood struct snd_pcm *pcm = rtd->pcm; 95f11a96d5SLiam Girdwood int ret = 0; 96f11a96d5SLiam Girdwood 97f11a96d5SLiam Girdwood if (!card->dev->dma_mask) 98f11a96d5SLiam Girdwood card->dev->dma_mask = &pxa2xx_pcm_dmamask; 99f11a96d5SLiam Girdwood if (!card->dev->coherent_dma_mask) 100284901a9SYang Hongyang card->dev->coherent_dma_mask = DMA_BIT_MASK(32); 101f11a96d5SLiam Girdwood 10253dea36cSDaniel Mack if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 103f11a96d5SLiam Girdwood ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 104f11a96d5SLiam Girdwood SNDRV_PCM_STREAM_PLAYBACK); 105f11a96d5SLiam Girdwood if (ret) 106f11a96d5SLiam Girdwood goto out; 107f11a96d5SLiam Girdwood } 108f11a96d5SLiam Girdwood 10953dea36cSDaniel Mack if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 110f11a96d5SLiam Girdwood ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, 111f11a96d5SLiam Girdwood SNDRV_PCM_STREAM_CAPTURE); 112f11a96d5SLiam Girdwood if (ret) 113f11a96d5SLiam Girdwood goto out; 114f11a96d5SLiam Girdwood } 115f11a96d5SLiam Girdwood out: 116f11a96d5SLiam Girdwood return ret; 117f11a96d5SLiam Girdwood } 118f11a96d5SLiam Girdwood 119f0fba2adSLiam Girdwood static struct snd_soc_platform_driver pxa2xx_soc_platform = { 120f0fba2adSLiam Girdwood .ops = &pxa2xx_pcm_ops, 1218a33de9eSDmitry Baryshkov .pcm_new = pxa2xx_soc_pcm_new, 122f11a96d5SLiam Girdwood .pcm_free = pxa2xx_pcm_free_dma_buffers, 123f11a96d5SLiam Girdwood }; 124f11a96d5SLiam Girdwood 125570f6fe1SBill Pemberton static int pxa2xx_soc_platform_probe(struct platform_device *pdev) 126958e792cSMark Brown { 127f0fba2adSLiam Girdwood return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform); 128958e792cSMark Brown } 129958e792cSMark Brown 130570f6fe1SBill Pemberton static int pxa2xx_soc_platform_remove(struct platform_device *pdev) 131958e792cSMark Brown { 132f0fba2adSLiam Girdwood snd_soc_unregister_platform(&pdev->dev); 133f0fba2adSLiam Girdwood return 0; 134958e792cSMark Brown } 135f0fba2adSLiam Girdwood 136f0fba2adSLiam Girdwood static struct platform_driver pxa_pcm_driver = { 137f0fba2adSLiam Girdwood .driver = { 138f0fba2adSLiam Girdwood .name = "pxa-pcm-audio", 139f0fba2adSLiam Girdwood .owner = THIS_MODULE, 140f0fba2adSLiam Girdwood }, 141f0fba2adSLiam Girdwood 142f0fba2adSLiam Girdwood .probe = pxa2xx_soc_platform_probe, 143570f6fe1SBill Pemberton .remove = pxa2xx_soc_platform_remove, 144f0fba2adSLiam Girdwood }; 145f0fba2adSLiam Girdwood 1462f702a19SAxel Lin module_platform_driver(pxa_pcm_driver); 147958e792cSMark Brown 148f11a96d5SLiam Girdwood MODULE_AUTHOR("Nicolas Pitre"); 149f11a96d5SLiam Girdwood MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); 150f11a96d5SLiam Girdwood MODULE_LICENSE("GPL"); 151