| /* |
| * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> |
| * |
| * This code is based on code copyrighted by Freescale, |
| * Liam Girdwood, Javier Martin and probably others. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| */ |
| |
| #include <linux/dma-mapping.h> |
| #include <linux/module.h> |
| #include <sound/pcm.h> |
| #include <sound/soc.h> |
| #include "imx-pcm.h" |
| |
| int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, |
| struct vm_area_struct *vma) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| int ret; |
| |
| ret = dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); |
| |
| pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret, |
| runtime->dma_area, |
| runtime->dma_addr, |
| runtime->dma_bytes); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(snd_imx_pcm_mmap); |
| |
| static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| { |
| struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
| struct snd_dma_buffer *buf = &substream->dma_buffer; |
| size_t size = IMX_SSI_DMABUF_SIZE; |
| |
| buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| buf->dev.dev = pcm->card->dev; |
| buf->private_data = NULL; |
| buf->area = dma_alloc_writecombine(pcm->card->dev, size, |
| &buf->addr, GFP_KERNEL); |
| if (!buf->area) |
| return -ENOMEM; |
| buf->bytes = size; |
| |
| return 0; |
| } |
| |
| static u64 imx_pcm_dmamask = DMA_BIT_MASK(32); |
| |
| int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) |
| { |
| struct snd_card *card = rtd->card->snd_card; |
| struct snd_pcm *pcm = rtd->pcm; |
| int ret = 0; |
| |
| if (!card->dev->dma_mask) |
| card->dev->dma_mask = &imx_pcm_dmamask; |
| if (!card->dev->coherent_dma_mask) |
| card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
| if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
| ret = imx_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_PLAYBACK); |
| if (ret) |
| goto out; |
| } |
| |
| if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
| ret = imx_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_CAPTURE); |
| if (ret) |
| goto out; |
| } |
| |
| out: |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(imx_pcm_new); |
| |
| void imx_pcm_free(struct snd_pcm *pcm) |
| { |
| struct snd_pcm_substream *substream; |
| struct snd_dma_buffer *buf; |
| int stream; |
| |
| for (stream = 0; stream < 2; stream++) { |
| substream = pcm->streams[stream].substream; |
| if (!substream) |
| continue; |
| |
| buf = &substream->dma_buffer; |
| if (!buf->area) |
| continue; |
| |
| dma_free_writecombine(pcm->card->dev, buf->bytes, |
| buf->area, buf->addr); |
| buf->area = NULL; |
| } |
| } |
| EXPORT_SYMBOL_GPL(imx_pcm_free); |
| |
| static int imx_pcm_probe(struct platform_device *pdev) |
| { |
| if (strcmp(pdev->id_entry->name, "imx-fiq-pcm-audio") == 0) |
| return imx_pcm_fiq_init(pdev); |
| |
| return imx_pcm_dma_init(pdev); |
| } |
| |
| static int imx_pcm_remove(struct platform_device *pdev) |
| { |
| if (strcmp(pdev->id_entry->name, "imx-fiq-pcm-audio") == 0) |
| snd_soc_unregister_platform(&pdev->dev); |
| else |
| imx_pcm_dma_exit(pdev); |
| |
| return 0; |
| } |
| |
| static struct platform_device_id imx_pcm_devtype[] = { |
| { .name = "imx-pcm-audio", }, |
| { .name = "imx-fiq-pcm-audio", }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(platform, imx_pcm_devtype); |
| |
| static struct platform_driver imx_pcm_driver = { |
| .driver = { |
| .name = "imx-pcm", |
| .owner = THIS_MODULE, |
| }, |
| .id_table = imx_pcm_devtype, |
| .probe = imx_pcm_probe, |
| .remove = imx_pcm_remove, |
| }; |
| module_platform_driver(imx_pcm_driver); |
| |
| MODULE_DESCRIPTION("Freescale i.MX PCM driver"); |
| MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); |
| MODULE_LICENSE("GPL"); |