sound/soc/imx/imx-pcm-dma-mx2.c - kernel/panda - Git at Google

 /*
  * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
  *
  * 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/clk.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/dmaengine.h>

 #include <sound/core.h>
 #include <sound/initval.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>

 #include <mach/dma.h>

 #include "imx-ssi.h"

 struct imx_pcm_runtime_data {
 	int period_bytes;
 	int periods;
 	int dma;
 	unsigned long offset;
 	unsigned long size;
 	void *buf;
 	int period_time;
 	struct dma_async_tx_descriptor *desc;
 	struct dma_chan *dma_chan;
 	struct imx_dma_data dma_data;
 };

 static void audio_dma_irq(void *data)
 {
 	struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

 	iprtd->offset += iprtd->period_bytes;
 	iprtd->offset %= iprtd->period_bytes * iprtd->periods;

 	snd_pcm_period_elapsed(substream);
 }

 static bool filter(struct dma_chan *chan, void *param)
 {
 	struct imx_pcm_runtime_data *iprtd = param;

 	if (!imx_dma_is_general_purpose(chan))
 		return false;

         chan->private = &iprtd->dma_data;

         return true;
 }

 static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct imx_pcm_dma_params *dma_params;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 	struct dma_slave_config slave_config;
 	dma_cap_mask_t mask;
 	enum dma_slave_buswidth buswidth;
 	int ret;

 	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

 	iprtd->dma_data.peripheral_type = IMX_DMATYPE_SSI;
 	iprtd->dma_data.priority = DMA_PRIO_HIGH;
 	iprtd->dma_data.dma_request = dma_params->dma;

 	/* Try to grab a DMA channel */
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 	iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
 	if (!iprtd->dma_chan)
 		return -EINVAL;

 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
 		break;
 	case SNDRV_PCM_FORMAT_S20_3LE:
 	case SNDRV_PCM_FORMAT_S24_LE:
 		buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
 		break;
 	default:
 		return 0;
 	}

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		slave_config.direction = DMA_TO_DEVICE;
 		slave_config.dst_addr = dma_params->dma_addr;
 		slave_config.dst_addr_width = buswidth;
 		slave_config.dst_maxburst = dma_params->burstsize;
 	} else {
 		slave_config.direction = DMA_FROM_DEVICE;
 		slave_config.src_addr = dma_params->dma_addr;
 		slave_config.src_addr_width = buswidth;
 		slave_config.src_maxburst = dma_params->burstsize;
 	}

 	ret = dmaengine_slave_config(iprtd->dma_chan, &slave_config);
 	if (ret)
 		return ret;

 	return 0;
 }

 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 	unsigned long dma_addr;
 	struct dma_chan *chan;
 	struct imx_pcm_dma_params *dma_params;
 	int ret;

 	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 	ret = imx_ssi_dma_alloc(substream, params);
 	if (ret)
 		return ret;
 	chan = iprtd->dma_chan;

 	iprtd->size = params_buffer_bytes(params);
 	iprtd->periods = params_periods(params);
 	iprtd->period_bytes = params_period_bytes(params);
 	iprtd->offset = 0;
 	iprtd->period_time = HZ / (params_rate(params) /
 			params_period_size(params));

 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

 	dma_addr = runtime->dma_addr;

 	iprtd->buf = (unsigned int *)substream->dma_buffer.area;

 	iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
 			iprtd->period_bytes * iprtd->periods,
 			iprtd->period_bytes,
 			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 			DMA_TO_DEVICE : DMA_FROM_DEVICE);
 	if (!iprtd->desc) {
 		dev_err(&chan->dev->device, "cannot prepare slave dma\n");
 		return -EINVAL;
 	}

 	iprtd->desc->callback = audio_dma_irq;
 	iprtd->desc->callback_param = substream;

 	return 0;
 }

 static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

 	if (iprtd->dma_chan) {
 		dma_release_channel(iprtd->dma_chan);
 		iprtd->dma_chan = NULL;
 	}

 	return 0;
 }

 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct imx_pcm_dma_params *dma_params;

 	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

 	return 0;
 }

 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		dmaengine_submit(iprtd->desc);

 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		dmaengine_terminate_all(iprtd->dma_chan);

 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

 	pr_debug("%s: %ld %ld\n", __func__, iprtd->offset,
 			bytes_to_frames(substream->runtime, iprtd->offset));

 	return bytes_to_frames(substream->runtime, iprtd->offset);
 }

 static struct snd_pcm_hardware snd_imx_hardware = {
 	.info = SNDRV_PCM_INFO_INTERLEAVED |
 		SNDRV_PCM_INFO_BLOCK_TRANSFER |
 		SNDRV_PCM_INFO_MMAP |
 		SNDRV_PCM_INFO_MMAP_VALID |
 		SNDRV_PCM_INFO_PAUSE |
 		SNDRV_PCM_INFO_RESUME,
 	.formats = SNDRV_PCM_FMTBIT_S16_LE,
 	.rate_min = 8000,
 	.channels_min = 2,
 	.channels_max = 2,
 	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 	.period_bytes_min = 128,
 	.period_bytes_max = 65535, /* Limited by SDMA engine */
 	.periods_min = 2,
 	.periods_max = 255,
 	.fifo_size = 0,
 };

 static int snd_imx_open(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd;
 	int ret;

 	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 	if (iprtd == NULL)
 		return -ENOMEM;
 	runtime->private_data = iprtd;

 	ret = snd_pcm_hw_constraint_integer(substream->runtime,
 			SNDRV_PCM_HW_PARAM_PERIODS);
 	if (ret < 0) {
 		kfree(iprtd);
 		return ret;
 	}

 	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);

 	return 0;
 }

 static int snd_imx_close(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

 	kfree(iprtd);

 	return 0;
 }

 static struct snd_pcm_ops imx_pcm_ops = {
 	.open		= snd_imx_open,
 	.close		= snd_imx_close,
 	.ioctl		= snd_pcm_lib_ioctl,
 	.hw_params	= snd_imx_pcm_hw_params,
 	.hw_free	= snd_imx_pcm_hw_free,
 	.prepare	= snd_imx_pcm_prepare,
 	.trigger	= snd_imx_pcm_trigger,
 	.pointer	= snd_imx_pcm_pointer,
 	.mmap		= snd_imx_pcm_mmap,
 };

 static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
 	.ops		= &imx_pcm_ops,
 	.pcm_new	= imx_pcm_new,
 	.pcm_free	= imx_pcm_free,
 };

 static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
 {
 	struct imx_ssi *ssi = platform_get_drvdata(pdev);

 	ssi->dma_params_tx.burstsize = 6;
 	ssi->dma_params_rx.burstsize = 4;

 	return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
 }

 static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
 {
 	snd_soc_unregister_platform(&pdev->dev);
 	return 0;
 }

 static struct platform_driver imx_pcm_driver = {
 	.driver = {
 			.name = "imx-pcm-audio",
 			.owner = THIS_MODULE,
 	},
 	.probe = imx_soc_platform_probe,
 	.remove = __devexit_p(imx_soc_platform_remove),
 };

 static int __init snd_imx_pcm_init(void)
 {
 	return platform_driver_register(&imx_pcm_driver);
 }
 module_init(snd_imx_pcm_init);

 static void __exit snd_imx_pcm_exit(void)
 {
 	platform_driver_unregister(&imx_pcm_driver);
 }
 module_exit(snd_imx_pcm_exit);
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:imx-pcm-audio");
	/*
	* imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
	*
	* 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/clk.h>
	#include <linux/delay.h>
	#include <linux/device.h>
	#include <linux/dma-mapping.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/dmaengine.h>

	#include <sound/core.h>
	#include <sound/initval.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>

	#include <mach/dma.h>

	#include "imx-ssi.h"

	struct imx_pcm_runtime_data {
	int period_bytes;
	int periods;
	int dma;
	unsigned long offset;
	unsigned long size;
	void *buf;
	int period_time;
	struct dma_async_tx_descriptor *desc;
	struct dma_chan *dma_chan;
	struct imx_dma_data dma_data;
	};

	static void audio_dma_irq(void *data)
	{
	struct snd_pcm_substream substream = (struct snd_pcm_substream )data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	iprtd->offset += iprtd->period_bytes;
	iprtd->offset %= iprtd->period_bytes * iprtd->periods;

	snd_pcm_period_elapsed(substream);
	}

	static bool filter(struct dma_chan chan, void param)
	{
	struct imx_pcm_runtime_data *iprtd = param;

	if (!imx_dma_is_general_purpose(chan))
	return false;

	chan->private = &iprtd->dma_data;

	return true;
	}

	static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	struct dma_slave_config slave_config;
	dma_cap_mask_t mask;
	enum dma_slave_buswidth buswidth;
	int ret;

	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	iprtd->dma_data.peripheral_type = IMX_DMATYPE_SSI;
	iprtd->dma_data.priority = DMA_PRIO_HIGH;
	iprtd->dma_data.dma_request = dma_params->dma;

	/* Try to grab a DMA channel */
	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);
	iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
	if (!iprtd->dma_chan)
	return -EINVAL;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	case SNDRV_PCM_FORMAT_S24_LE:
	buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
	break;
	default:
	return 0;
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	slave_config.direction = DMA_TO_DEVICE;
	slave_config.dst_addr = dma_params->dma_addr;
	slave_config.dst_addr_width = buswidth;
	slave_config.dst_maxburst = dma_params->burstsize;
	} else {
	slave_config.direction = DMA_FROM_DEVICE;
	slave_config.src_addr = dma_params->dma_addr;
	slave_config.src_addr_width = buswidth;
	slave_config.src_maxburst = dma_params->burstsize;
	}

	ret = dmaengine_slave_config(iprtd->dma_chan, &slave_config);
	if (ret)
	return ret;

	return 0;
	}

	static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	unsigned long dma_addr;
	struct dma_chan *chan;
	struct imx_pcm_dma_params *dma_params;
	int ret;

	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	ret = imx_ssi_dma_alloc(substream, params);
	if (ret)
	return ret;
	chan = iprtd->dma_chan;

	iprtd->size = params_buffer_bytes(params);
	iprtd->periods = params_periods(params);
	iprtd->period_bytes = params_period_bytes(params);
	iprtd->offset = 0;
	iprtd->period_time = HZ / (params_rate(params) /
	params_period_size(params));

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	dma_addr = runtime->dma_addr;

	iprtd->buf = (unsigned int *)substream->dma_buffer.area;

	iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
	iprtd->period_bytes * iprtd->periods,
	iprtd->period_bytes,
	substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
	DMA_TO_DEVICE : DMA_FROM_DEVICE);
	if (!iprtd->desc) {
	dev_err(&chan->dev->device, "cannot prepare slave dma\n");
	return -EINVAL;
	}

	iprtd->desc->callback = audio_dma_irq;
	iprtd->desc->callback_param = substream;

	return 0;
	}

	static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	if (iprtd->dma_chan) {
	dma_release_channel(iprtd->dma_chan);
	iprtd->dma_chan = NULL;
	}

	return 0;
	}

	static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params;

	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	return 0;
	}

	static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	dmaengine_submit(iprtd->desc);

	break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	dmaengine_terminate_all(iprtd->dma_chan);

	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	pr_debug("%s: %ld %ld\n", __func__, iprtd->offset,
	bytes_to_frames(substream->runtime, iprtd->offset));

	return bytes_to_frames(substream->runtime, iprtd->offset);
	}

	static struct snd_pcm_hardware snd_imx_hardware = {
	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_PAUSE \|
	SNDRV_PCM_INFO_RESUME,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rate_min = 8000,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	.period_bytes_min = 128,
	.period_bytes_max = 65535, /* Limited by SDMA engine */
	.periods_min = 2,
	.periods_max = 255,
	.fifo_size = 0,
	};

	static int snd_imx_open(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd;
	int ret;

	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
	if (iprtd == NULL)
	return -ENOMEM;
	runtime->private_data = iprtd;

	ret = snd_pcm_hw_constraint_integer(substream->runtime,
	SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0) {
	kfree(iprtd);
	return ret;
	}

	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);

	return 0;
	}

	static int snd_imx_close(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	kfree(iprtd);

	return 0;
	}

	static struct snd_pcm_ops imx_pcm_ops = {
	.open = snd_imx_open,
	.close = snd_imx_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_imx_pcm_hw_params,
	.hw_free = snd_imx_pcm_hw_free,
	.prepare = snd_imx_pcm_prepare,
	.trigger = snd_imx_pcm_trigger,
	.pointer = snd_imx_pcm_pointer,
	.mmap = snd_imx_pcm_mmap,
	};

	static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
	.ops = &imx_pcm_ops,
	.pcm_new = imx_pcm_new,
	.pcm_free = imx_pcm_free,
	};

	static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
	{
	struct imx_ssi *ssi = platform_get_drvdata(pdev);

	ssi->dma_params_tx.burstsize = 6;
	ssi->dma_params_rx.burstsize = 4;

	return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
	}

	static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
	{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
	}

	static struct platform_driver imx_pcm_driver = {
	.driver = {
	.name = "imx-pcm-audio",
	.owner = THIS_MODULE,
	},
	.probe = imx_soc_platform_probe,
	.remove = __devexit_p(imx_soc_platform_remove),
	};

	static int __init snd_imx_pcm_init(void)
	{
	return platform_driver_register(&imx_pcm_driver);
	}
	module_init(snd_imx_pcm_init);

	static void __exit snd_imx_pcm_exit(void)
	{
	platform_driver_unregister(&imx_pcm_driver);
	}
	module_exit(snd_imx_pcm_exit);
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:imx-pcm-audio");