161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
/*
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* imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
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*
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* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
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*
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* This code is based on code copyrighted by Freescale,
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* Liam Girdwood, Javier Martin and probably others.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dmaengine.h>
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#include <linux/types.h>
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#include <sound/core.h>
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#include <sound/initval.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 <linux/platform_data/dma-imx.h>
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#include "imx-pcm.h"
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static bool filter(struct dma_chan *chan, void *param)
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{
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if (!imx_dma_is_general_purpose(chan))
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return false;
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chan->private = param;
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return true;
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}
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static int snd_imx_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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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
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struct imx_pcm_dma_params *dma_params;
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struct dma_slave_config slave_config;
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int ret;
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dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
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if (ret)
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return ret;
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slave_config.device_fc = false;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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slave_config.dst_addr = dma_params->dma_addr;
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slave_config.dst_maxburst = dma_params->burstsize;
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} else {
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slave_config.src_addr = dma_params->dma_addr;
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slave_config.src_maxburst = dma_params->burstsize;
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}
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ret = dmaengine_slave_config(chan, &slave_config);
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if (ret)
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return ret;
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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 struct snd_pcm_hardware snd_imx_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.rate_min = 8000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
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.period_bytes_min = 128,
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.period_bytes_max = 65535, /* Limited by SDMA engine */
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.periods_min = 2,
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.periods_max = 255,
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.fifo_size = 0,
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};
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static int snd_imx_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 imx_pcm_dma_params *dma_params;
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struct imx_dma_data *dma_data;
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int ret;
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snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
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dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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dma_data = kzalloc(sizeof(*dma_data), GFP_KERNEL);
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if (!dma_data)
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return -ENOMEM;
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dma_data->peripheral_type = dma_params->shared_peripheral ?
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IMX_DMATYPE_SSI_SP : IMX_DMATYPE_SSI;
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dma_data->priority = DMA_PRIO_HIGH;
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dma_data->dma_request = dma_params->dma;
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ret = snd_dmaengine_pcm_open(substream, 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 snd_imx_close(struct snd_pcm_substream *substream)
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{
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struct imx_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 struct snd_pcm_ops imx_pcm_ops = {
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.open = snd_imx_open,
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.close = snd_imx_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = snd_imx_pcm_hw_params,
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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 = snd_imx_pcm_mmap,
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};
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static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
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.ops = &imx_pcm_ops,
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.pcm_new = imx_pcm_new,
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.pcm_free = imx_pcm_free,
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};
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int imx_pcm_dma_init(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
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}
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