sound/soc/ux500/ux500_pcm.c - maze/linux - Git at Google

 /*
  * Copyright (C) ST-Ericsson SA 2012
  *
  * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
  *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
  *         for ST-Ericsson.
  *
  * License terms:
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as published
  * by the Free Software Foundation.
  */

 #include <asm/page.h>

 #include <linux/module.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
 #include <linux/slab.h>
 #include <linux/platform_data/dma-ste-dma40.h>

 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/dmaengine_pcm.h>

 #include "ux500_msp_i2s.h"
 #include "ux500_pcm.h"

 #define UX500_PLATFORM_MIN_RATE 8000
 #define UX500_PLATFORM_MAX_RATE 48000

 #define UX500_PLATFORM_MIN_CHANNELS 1
 #define UX500_PLATFORM_MAX_CHANNELS 8

 #define UX500_PLATFORM_PERIODS_BYTES_MIN	128
 #define UX500_PLATFORM_PERIODS_BYTES_MAX	(64 * PAGE_SIZE)
 #define UX500_PLATFORM_PERIODS_MIN		2
 #define UX500_PLATFORM_PERIODS_MAX		48
 #define UX500_PLATFORM_BUFFER_BYTES_MAX		(2048 * PAGE_SIZE)

 static struct snd_pcm_hardware ux500_pcm_hw = {
 	.info = SNDRV_PCM_INFO_INTERLEAVED |
 		SNDRV_PCM_INFO_MMAP |
 		SNDRV_PCM_INFO_RESUME |
 		SNDRV_PCM_INFO_PAUSE,
 	.formats = SNDRV_PCM_FMTBIT_S16_LE |
 		SNDRV_PCM_FMTBIT_U16_LE |
 		SNDRV_PCM_FMTBIT_S16_BE |
 		SNDRV_PCM_FMTBIT_U16_BE,
 	.rates = SNDRV_PCM_RATE_KNOT,
 	.rate_min = UX500_PLATFORM_MIN_RATE,
 	.rate_max = UX500_PLATFORM_MAX_RATE,
 	.channels_min = UX500_PLATFORM_MIN_CHANNELS,
 	.channels_max = UX500_PLATFORM_MAX_CHANNELS,
 	.buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
 	.period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
 	.period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
 	.periods_min = UX500_PLATFORM_PERIODS_MIN,
 	.periods_max = UX500_PLATFORM_PERIODS_MAX,
 };

 static void ux500_pcm_dma_hw_free(struct device *dev,
 				struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_dma_buffer *buf = runtime->dma_buffer_p;

 	if (runtime->dma_area == NULL)
 		return;

 	if (buf != &substream->dma_buffer) {
 		dma_free_coherent(buf->dev.dev, buf->bytes, buf->area,
 				buf->addr);
 		kfree(runtime->dma_buffer_p);
 	}

 	snd_pcm_set_runtime_buffer(substream, NULL);
 }

 static int ux500_pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_dai *dai = rtd->cpu_dai;
 	struct device *dev = dai->dev;
 	int ret;
 	struct ux500_msp_dma_params *dma_params;
 	u16 per_data_width, mem_data_width;
 	struct stedma40_chan_cfg *dma_cfg;

 	dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id,
 		snd_pcm_stream_str(substream));

 	dev_dbg(dev, "%s: Set runtime hwparams.\n", __func__);
 	snd_soc_set_runtime_hwparams(substream, &ux500_pcm_hw);

 	mem_data_width = STEDMA40_HALFWORD_WIDTH;

 	dma_params = snd_soc_dai_get_dma_data(dai, substream);
 	switch (dma_params->data_size) {
 	case 32:
 		per_data_width = STEDMA40_WORD_WIDTH;
 		break;
 	case 16:
 		per_data_width = STEDMA40_HALFWORD_WIDTH;
 		break;
 	case 8:
 		per_data_width = STEDMA40_BYTE_WIDTH;
 		break;
 	default:
 		per_data_width = STEDMA40_WORD_WIDTH;
 		dev_warn(rtd->platform->dev,
 			"%s: Unknown data-size (%d)! Assuming 32 bits.\n",
 			__func__, dma_params->data_size);
 	}

 	dma_cfg = dma_params->dma_cfg;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		dma_cfg->src_info.data_width = mem_data_width;
 		dma_cfg->dst_info.data_width = per_data_width;
 	} else {
 		dma_cfg->src_info.data_width = per_data_width;
 		dma_cfg->dst_info.data_width = mem_data_width;
 	}

 	ret = snd_dmaengine_pcm_open_request_chan(substream, stedma40_filter,
 			dma_cfg);
 	if (ret) {
 		dev_dbg(dai->dev,
 			"%s: ERROR: snd_dmaengine_pcm_open failed (%d)!\n",
 			__func__, ret);
 		return ret;
 	}

 	return 0;
 }

 static int ux500_pcm_hw_params(struct snd_pcm_substream *substream,
 			struct snd_pcm_hw_params *hw_params)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_dma_buffer *buf = runtime->dma_buffer_p;
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	int ret = 0;
 	int size;

 	dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

 	size = params_buffer_bytes(hw_params);

 	if (buf) {
 		if (buf->bytes >= size)
 			goto out;
 		ux500_pcm_dma_hw_free(NULL, substream);
 	}

 	if (substream->dma_buffer.area != NULL &&
 		substream->dma_buffer.bytes >= size) {
 		buf = &substream->dma_buffer;
 	} else {
 		buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL);
 		if (!buf)
 			goto nomem;

 		buf->dev.type = SNDRV_DMA_TYPE_DEV;
 		buf->dev.dev = NULL;
 		buf->area = dma_alloc_coherent(NULL, size, &buf->addr,
 					GFP_KERNEL);
 		buf->bytes = size;
 		buf->private_data = NULL;

 		if (!buf->area)
 			goto free;
 	}
 	snd_pcm_set_runtime_buffer(substream, buf);
 	ret = 1;
  out:
 	runtime->dma_bytes = size;
 	return ret;

  free:
 	kfree(buf);
  nomem:
 	return -ENOMEM;
 }

 static int ux500_pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;

 	dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

 	ux500_pcm_dma_hw_free(NULL, substream);

 	return 0;
 }

 static int ux500_pcm_mmap(struct snd_pcm_substream *substream,
 			struct vm_area_struct *vma)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;

 	dev_dbg(rtd->platform->dev, "%s: Enter.\n", __func__);

 	return dma_mmap_coherent(NULL, vma, runtime->dma_area,
 				runtime->dma_addr, runtime->dma_bytes);
 }

 static struct snd_pcm_ops ux500_pcm_ops = {
 	.open		= ux500_pcm_open,
 	.close		= snd_dmaengine_pcm_close_release_chan,
 	.ioctl		= snd_pcm_lib_ioctl,
 	.hw_params	= ux500_pcm_hw_params,
 	.hw_free	= ux500_pcm_hw_free,
 	.trigger	= snd_dmaengine_pcm_trigger,
 	.pointer	= snd_dmaengine_pcm_pointer_no_residue,
 	.mmap		= ux500_pcm_mmap
 };

 int ux500_pcm_new(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_pcm *pcm = rtd->pcm;

 	dev_dbg(rtd->platform->dev, "%s: Enter (id = '%s').\n", __func__,
 		pcm->id);

 	pcm->info_flags = 0;

 	return 0;
 }

 static struct snd_soc_platform_driver ux500_pcm_soc_drv = {
 	.ops		= &ux500_pcm_ops,
 	.pcm_new        = ux500_pcm_new,
 };

 int ux500_pcm_register_platform(struct platform_device *pdev)
 {
 	int ret;

 	ret = snd_soc_register_platform(&pdev->dev, &ux500_pcm_soc_drv);
 	if (ret < 0) {
 		dev_err(&pdev->dev,
 			"%s: ERROR: Failed to register platform '%s' (%d)!\n",
 			__func__, pdev->name, ret);
 		return ret;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);

 int ux500_pcm_unregister_platform(struct platform_device *pdev)
 {
 	snd_soc_unregister_platform(&pdev->dev);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
	/*
	* Copyright (C) ST-Ericsson SA 2012
	*
	* Author: Ola Lilja <ola.o.lilja@stericsson.com>,
	* Roger Nilsson <roger.xr.nilsson@stericsson.com>
	* for ST-Ericsson.
	*
	* License terms:
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as published
	* by the Free Software Foundation.
	*/

	#include <asm/page.h>

	#include <linux/module.h>
	#include <linux/dma-mapping.h>
	#include <linux/dmaengine.h>
	#include <linux/slab.h>
	#include <linux/platform_data/dma-ste-dma40.h>

	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/dmaengine_pcm.h>

	#include "ux500_msp_i2s.h"
	#include "ux500_pcm.h"

	#define UX500_PLATFORM_MIN_RATE 8000
	#define UX500_PLATFORM_MAX_RATE 48000

	#define UX500_PLATFORM_MIN_CHANNELS 1
	#define UX500_PLATFORM_MAX_CHANNELS 8

	#define UX500_PLATFORM_PERIODS_BYTES_MIN 128
	#define UX500_PLATFORM_PERIODS_BYTES_MAX (64 * PAGE_SIZE)
	#define UX500_PLATFORM_PERIODS_MIN 2
	#define UX500_PLATFORM_PERIODS_MAX 48
	#define UX500_PLATFORM_BUFFER_BYTES_MAX (2048 * PAGE_SIZE)

	static struct snd_pcm_hardware ux500_pcm_hw = {
	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_RESUME \|
	SNDRV_PCM_INFO_PAUSE,
	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_U16_LE \|
	SNDRV_PCM_FMTBIT_S16_BE \|
	SNDRV_PCM_FMTBIT_U16_BE,
	.rates = SNDRV_PCM_RATE_KNOT,
	.rate_min = UX500_PLATFORM_MIN_RATE,
	.rate_max = UX500_PLATFORM_MAX_RATE,
	.channels_min = UX500_PLATFORM_MIN_CHANNELS,
	.channels_max = UX500_PLATFORM_MAX_CHANNELS,
	.buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
	.period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
	.period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
	.periods_min = UX500_PLATFORM_PERIODS_MIN,
	.periods_max = UX500_PLATFORM_PERIODS_MAX,
	};

	static void ux500_pcm_dma_hw_free(struct device *dev,
	struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dma_buffer *buf = runtime->dma_buffer_p;

	if (runtime->dma_area == NULL)
	return;

	if (buf != &substream->dma_buffer) {
	dma_free_coherent(buf->dev.dev, buf->bytes, buf->area,
	buf->addr);
	kfree(runtime->dma_buffer_p);
	}

	snd_pcm_set_runtime_buffer(substream, NULL);
	}

	static int ux500_pcm_open(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *dai = rtd->cpu_dai;
	struct device *dev = dai->dev;
	int ret;
	struct ux500_msp_dma_params *dma_params;
	u16 per_data_width, mem_data_width;
	struct stedma40_chan_cfg *dma_cfg;

	dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id,
	snd_pcm_stream_str(substream));

	dev_dbg(dev, "%s: Set runtime hwparams.\n", __func__);
	snd_soc_set_runtime_hwparams(substream, &ux500_pcm_hw);

	mem_data_width = STEDMA40_HALFWORD_WIDTH;

	dma_params = snd_soc_dai_get_dma_data(dai, substream);
	switch (dma_params->data_size) {
	case 32:
	per_data_width = STEDMA40_WORD_WIDTH;
	break;
	case 16:
	per_data_width = STEDMA40_HALFWORD_WIDTH;
	break;
	case 8:
	per_data_width = STEDMA40_BYTE_WIDTH;
	break;
	default:
	per_data_width = STEDMA40_WORD_WIDTH;
	dev_warn(rtd->platform->dev,
	"%s: Unknown data-size (%d)! Assuming 32 bits.\n",
	__func__, dma_params->data_size);
	}

	dma_cfg = dma_params->dma_cfg;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	dma_cfg->src_info.data_width = mem_data_width;
	dma_cfg->dst_info.data_width = per_data_width;
	} else {
	dma_cfg->src_info.data_width = per_data_width;
	dma_cfg->dst_info.data_width = mem_data_width;
	}

	ret = snd_dmaengine_pcm_open_request_chan(substream, stedma40_filter,
	dma_cfg);
	if (ret) {
	dev_dbg(dai->dev,
	"%s: ERROR: snd_dmaengine_pcm_open failed (%d)!\n",
	__func__, ret);
	return ret;
	}

	return 0;
	}

	static int ux500_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dma_buffer *buf = runtime->dma_buffer_p;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int ret = 0;
	int size;

	dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

	size = params_buffer_bytes(hw_params);

	if (buf) {
	if (buf->bytes >= size)
	goto out;
	ux500_pcm_dma_hw_free(NULL, substream);
	}

	if (substream->dma_buffer.area != NULL &&
	substream->dma_buffer.bytes >= size) {
	buf = &substream->dma_buffer;
	} else {
	buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL);
	if (!buf)
	goto nomem;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = NULL;
	buf->area = dma_alloc_coherent(NULL, size, &buf->addr,
	GFP_KERNEL);
	buf->bytes = size;
	buf->private_data = NULL;

	if (!buf->area)
	goto free;
	}
	snd_pcm_set_runtime_buffer(substream, buf);
	ret = 1;
	out:
	runtime->dma_bytes = size;
	return ret;

	free:
	kfree(buf);
	nomem:
	return -ENOMEM;
	}

	static int ux500_pcm_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

	ux500_pcm_dma_hw_free(NULL, substream);

	return 0;
	}

	static int ux500_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	dev_dbg(rtd->platform->dev, "%s: Enter.\n", __func__);

	return dma_mmap_coherent(NULL, vma, runtime->dma_area,
	runtime->dma_addr, runtime->dma_bytes);
	}

	static struct snd_pcm_ops ux500_pcm_ops = {
	.open = ux500_pcm_open,
	.close = snd_dmaengine_pcm_close_release_chan,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = ux500_pcm_hw_params,
	.hw_free = ux500_pcm_hw_free,
	.trigger = snd_dmaengine_pcm_trigger,
	.pointer = snd_dmaengine_pcm_pointer_no_residue,
	.mmap = ux500_pcm_mmap
	};

	int ux500_pcm_new(struct snd_soc_pcm_runtime *rtd)
	{
	struct snd_pcm *pcm = rtd->pcm;

	dev_dbg(rtd->platform->dev, "%s: Enter (id = '%s').\n", __func__,
	pcm->id);

	pcm->info_flags = 0;

	return 0;
	}

	static struct snd_soc_platform_driver ux500_pcm_soc_drv = {
	.ops = &ux500_pcm_ops,
	.pcm_new = ux500_pcm_new,
	};

	int ux500_pcm_register_platform(struct platform_device *pdev)
	{
	int ret;

	ret = snd_soc_register_platform(&pdev->dev, &ux500_pcm_soc_drv);
	if (ret < 0) {
	dev_err(&pdev->dev,
	"%s: ERROR: Failed to register platform '%s' (%d)!\n",
	__func__, pdev->name, ret);
	return ret;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);

	int ux500_pcm_unregister_platform(struct platform_device *pdev)
	{
	snd_soc_unregister_platform(&pdev->dev);

	return 0;
	}
	EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);