| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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 <sound/core.h> |
| 19 | #include <sound/soc.h> |
| 20 | #include <sound/pxa2xx-lib.h> |
| 21 | #include <sound/dmaengine_pcm.h> |
| 22 | |
| 23 | #include "../../arm/pxa2xx-pcm.h" |
| 24 | |
| 25 | static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, |
| 26 | struct snd_pcm_hw_params *params) |
| 27 | { |
| 28 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 29 | struct snd_dmaengine_dai_dma_data *dma; |
| 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 | return __pxa2xx_pcm_hw_params(substream, params); |
| 39 | } |
| 40 | |
| 41 | static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) |
| 42 | { |
| 43 | __pxa2xx_pcm_hw_free(substream); |
| 44 | |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | static const struct snd_pcm_ops pxa2xx_pcm_ops = { |
| 49 | .open = __pxa2xx_pcm_open, |
| 50 | .close = __pxa2xx_pcm_close, |
| 51 | .ioctl = snd_pcm_lib_ioctl, |
| 52 | .hw_params = pxa2xx_pcm_hw_params, |
| 53 | .hw_free = pxa2xx_pcm_hw_free, |
| 54 | .prepare = __pxa2xx_pcm_prepare, |
| 55 | .trigger = pxa2xx_pcm_trigger, |
| 56 | .pointer = pxa2xx_pcm_pointer, |
| 57 | .mmap = pxa2xx_pcm_mmap, |
| 58 | }; |
| 59 | |
| 60 | static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd) |
| 61 | { |
| 62 | struct snd_card *card = rtd->card->snd_card; |
| 63 | struct snd_pcm *pcm = rtd->pcm; |
| 64 | int ret; |
| 65 | |
| 66 | ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); |
| 67 | if (ret) |
| 68 | return ret; |
| 69 | |
| 70 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
| 71 | ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, |
| 72 | SNDRV_PCM_STREAM_PLAYBACK); |
| 73 | if (ret) |
| 74 | goto out; |
| 75 | } |
| 76 | |
| 77 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
| 78 | ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, |
| 79 | SNDRV_PCM_STREAM_CAPTURE); |
| 80 | if (ret) |
| 81 | goto out; |
| 82 | } |
| 83 | out: |
| 84 | return ret; |
| 85 | } |
| 86 | |
| 87 | static const struct snd_soc_platform_driver pxa2xx_soc_platform = { |
| 88 | .ops = &pxa2xx_pcm_ops, |
| 89 | .pcm_new = pxa2xx_soc_pcm_new, |
| 90 | .pcm_free = pxa2xx_pcm_free_dma_buffers, |
| 91 | }; |
| 92 | |
| 93 | static int pxa2xx_soc_platform_probe(struct platform_device *pdev) |
| 94 | { |
| 95 | return devm_snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform); |
| 96 | } |
| 97 | |
| 98 | #ifdef CONFIG_OF |
| 99 | static const struct of_device_id snd_soc_pxa_audio_match[] = { |
| 100 | { .compatible = "mrvl,pxa-pcm-audio" }, |
| 101 | { } |
| 102 | }; |
| 103 | MODULE_DEVICE_TABLE(of, snd_soc_pxa_audio_match); |
| 104 | #endif |
| 105 | |
| 106 | static struct platform_driver pxa_pcm_driver = { |
| 107 | .driver = { |
| 108 | .name = "pxa-pcm-audio", |
| 109 | .of_match_table = of_match_ptr(snd_soc_pxa_audio_match), |
| 110 | }, |
| 111 | |
| 112 | .probe = pxa2xx_soc_platform_probe, |
| 113 | }; |
| 114 | |
| 115 | module_platform_driver(pxa_pcm_driver); |
| 116 | |
| 117 | MODULE_AUTHOR("Nicolas Pitre"); |
| 118 | MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); |
| 119 | MODULE_LICENSE("GPL"); |
| 120 | MODULE_ALIAS("platform:pxa-pcm-audio"); |