243 lines
6.0 KiB
C
243 lines
6.0 KiB
C
/*
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* linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
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*
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* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
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* Copyright (C) 2006 Applied Data Systems
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*
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* Rewritten for the SoC audio subsystem (Based on PXA2xx code):
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* Copyright (c) 2008 Ryan Mallon
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include <mach/dma.h>
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#include <mach/hardware.h>
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#include <mach/ep93xx-regs.h>
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#include "ep93xx-pcm.h"
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static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
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.info = (SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER),
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.rates = SNDRV_PCM_RATE_8000_192000,
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.rate_min = SNDRV_PCM_RATE_8000,
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.rate_max = SNDRV_PCM_RATE_192000,
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.formats = (SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_LE |
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SNDRV_PCM_FMTBIT_S32_LE),
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.buffer_bytes_max = 131072,
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.period_bytes_min = 32,
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.period_bytes_max = 32768,
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.periods_min = 1,
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.periods_max = 32,
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.fifo_size = 32,
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};
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static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
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{
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struct ep93xx_dma_data *data = filter_param;
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if (data->direction == ep93xx_dma_chan_direction(chan)) {
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chan->private = data;
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return true;
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}
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return false;
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}
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static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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struct ep93xx_pcm_dma_params *dma_params;
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struct ep93xx_dma_data *dma_data;
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int ret;
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snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);
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dma_data = kmalloc(sizeof(*dma_data), GFP_KERNEL);
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if (!dma_data)
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return -ENOMEM;
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dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
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dma_data->port = dma_params->dma_port;
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dma_data->name = dma_params->name;
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dma_data->direction = snd_pcm_substream_to_dma_direction(substream);
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ret = snd_dmaengine_pcm_open(substream, ep93xx_pcm_dma_filter, dma_data);
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if (ret) {
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kfree(dma_data);
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return ret;
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}
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snd_dmaengine_pcm_set_data(substream, dma_data);
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return 0;
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}
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static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
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{
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struct dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
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snd_dmaengine_pcm_close(substream);
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kfree(dma_data);
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return 0;
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}
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static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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return 0;
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}
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static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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snd_pcm_set_runtime_buffer(substream, NULL);
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return 0;
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}
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static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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return dma_mmap_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area,
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runtime->dma_addr,
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runtime->dma_bytes);
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}
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static struct snd_pcm_ops ep93xx_pcm_ops = {
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.open = ep93xx_pcm_open,
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.close = ep93xx_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = ep93xx_pcm_hw_params,
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.hw_free = ep93xx_pcm_hw_free,
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.trigger = snd_dmaengine_pcm_trigger,
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.pointer = snd_dmaengine_pcm_pointer_no_residue,
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.mmap = ep93xx_pcm_mmap,
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};
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static int ep93xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = ep93xx_pcm_hardware.buffer_bytes_max;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->area = dma_alloc_writecombine(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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buf->bytes = size;
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return (buf->area == NULL) ? -ENOMEM : 0;
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}
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static void ep93xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf;
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int stream;
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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dma_free_writecombine(pcm->card->dev, buf->bytes, buf->area,
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buf->addr);
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buf->area = NULL;
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}
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}
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static u64 ep93xx_pcm_dmamask = DMA_BIT_MASK(32);
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static int ep93xx_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm *pcm = rtd->pcm;
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int ret = 0;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &ep93xx_pcm_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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return ret;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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return ret;
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}
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return 0;
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}
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static struct snd_soc_platform_driver ep93xx_soc_platform = {
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.ops = &ep93xx_pcm_ops,
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.pcm_new = &ep93xx_pcm_new,
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.pcm_free = &ep93xx_pcm_free_dma_buffers,
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};
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static int __devinit ep93xx_soc_platform_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &ep93xx_soc_platform);
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}
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static int __devexit ep93xx_soc_platform_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
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return 0;
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}
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static struct platform_driver ep93xx_pcm_driver = {
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.driver = {
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.name = "ep93xx-pcm-audio",
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.owner = THIS_MODULE,
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},
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.probe = ep93xx_soc_platform_probe,
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.remove = __devexit_p(ep93xx_soc_platform_remove),
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};
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module_platform_driver(ep93xx_pcm_driver);
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MODULE_AUTHOR("Ryan Mallon");
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MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ep93xx-pcm-audio");
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