sound/soc/ep93xx/ep93xx-pcm.c - kernel/msm - Gitiles

 /*
  * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
  *
  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
  * Copyright (C) 2006 Applied Data Systems
  *
  * Rewritten for the SoC audio subsystem (Based on PXA2xx code):
  *   Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com>
  *
  * 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 <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/dma-mapping.h>

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

 #include <mach/dma.h>
 #include <mach/hardware.h>
 #include <mach/ep93xx-regs.h>

 #include "ep93xx-pcm.h"

 static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
 	.info			= (SNDRV_PCM_INFO_MMAP		|
 				   SNDRV_PCM_INFO_MMAP_VALID	|
 				   SNDRV_PCM_INFO_INTERLEAVED	|
 				   SNDRV_PCM_INFO_BLOCK_TRANSFER),

 	.rates			= SNDRV_PCM_RATE_8000_48000,
 	.rate_min		= SNDRV_PCM_RATE_8000,
 	.rate_max		= SNDRV_PCM_RATE_48000,

 	.formats		= (SNDRV_PCM_FMTBIT_S16_LE |
 				   SNDRV_PCM_FMTBIT_S24_LE |
 				   SNDRV_PCM_FMTBIT_S32_LE),

 	.buffer_bytes_max	= 131072,
 	.period_bytes_min	= 32,
 	.period_bytes_max	= 32768,
 	.periods_min		= 1,
 	.periods_max		= 32,
 	.fifo_size		= 32,
 };

 struct ep93xx_runtime_data
 {
 	struct ep93xx_dma_m2p_client	cl;
 	struct ep93xx_pcm_dma_params	*params;
 	int				pointer_bytes;
 	struct tasklet_struct		period_tasklet;
 	int				periods;
 	struct ep93xx_dma_buffer	buf[32];
 };

 static void ep93xx_pcm_period_elapsed(unsigned long data)
 {
 	struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
 	snd_pcm_period_elapsed(substream);
 }

 static void ep93xx_pcm_buffer_started(void *cookie,
 				      struct ep93xx_dma_buffer *buf)
 {
 }

 static void ep93xx_pcm_buffer_finished(void *cookie,
 				       struct ep93xx_dma_buffer *buf,
 				       int bytes, int error)
 {
 	struct snd_pcm_substream *substream = cookie;
 	struct ep93xx_runtime_data *rtd = substream->runtime->private_data;

 	if (buf == rtd->buf + rtd->periods - 1)
 		rtd->pointer_bytes = 0;
 	else
 		rtd->pointer_bytes += buf->size;

 	if (!error) {
 		ep93xx_dma_m2p_submit_recursive(&rtd->cl, buf);
 		tasklet_schedule(&rtd->period_tasklet);
 	} else {
 		snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 	}
 }

 static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *soc_rtd = substream->private_data;
 	struct snd_soc_dai *cpu_dai = soc_rtd->cpu_dai;
 	struct ep93xx_pcm_dma_params *dma_params;
 	struct ep93xx_runtime_data *rtd;
 	int ret;

 	dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
 	snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);

 	rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
 	if (!rtd)
 		return -ENOMEM;

 	memset(&rtd->period_tasklet, 0, sizeof(rtd->period_tasklet));
 	rtd->period_tasklet.func = ep93xx_pcm_period_elapsed;
 	rtd->period_tasklet.data = (unsigned long)substream;

 	rtd->cl.name = dma_params->name;
 	rtd->cl.flags = dma_params->dma_port | EP93XX_DMA_M2P_IGNORE_ERROR |
 		((substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 		 EP93XX_DMA_M2P_TX : EP93XX_DMA_M2P_RX);
 	rtd->cl.cookie = substream;
 	rtd->cl.buffer_started = ep93xx_pcm_buffer_started;
 	rtd->cl.buffer_finished = ep93xx_pcm_buffer_finished;
 	ret = ep93xx_dma_m2p_client_register(&rtd->cl);
 	if (ret < 0) {
 		kfree(rtd);
 		return ret;
 	}

 	substream->runtime->private_data = rtd;
 	return 0;
 }

 static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
 {
 	struct ep93xx_runtime_data *rtd = substream->runtime->private_data;

 	ep93xx_dma_m2p_client_unregister(&rtd->cl);
 	kfree(rtd);
 	return 0;
 }

 static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct ep93xx_runtime_data *rtd = runtime->private_data;
 	size_t totsize = params_buffer_bytes(params);
 	size_t period = params_period_bytes(params);
 	int i;

 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 	runtime->dma_bytes = totsize;

 	rtd->periods = (totsize + period - 1) / period;
 	for (i = 0; i < rtd->periods; i++) {
 		rtd->buf[i].bus_addr = runtime->dma_addr + (i * period);
 		rtd->buf[i].size = period;
 		if ((i + 1) * period > totsize)
 			rtd->buf[i].size = totsize - (i * period);
 	}

 	return 0;
 }

 static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	snd_pcm_set_runtime_buffer(substream, NULL);
 	return 0;
 }

 static int ep93xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
 	int ret;
 	int i;

 	ret = 0;
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		rtd->pointer_bytes = 0;
 		for (i = 0; i < rtd->periods; i++)
 			ep93xx_dma_m2p_submit(&rtd->cl, rtd->buf + i);
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		ep93xx_dma_m2p_flush(&rtd->cl);
 		break;

 	default:
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 static snd_pcm_uframes_t ep93xx_pcm_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct ep93xx_runtime_data *rtd = substream->runtime->private_data;

 	/* FIXME: implement this with sub-period granularity */
 	return bytes_to_frames(runtime, rtd->pointer_bytes);
 }

 static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream,
 			   struct vm_area_struct *vma)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;

 	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 				     runtime->dma_area,
 				     runtime->dma_addr,
 				     runtime->dma_bytes);
 }

 static struct snd_pcm_ops ep93xx_pcm_ops = {
 	.open		= ep93xx_pcm_open,
 	.close		= ep93xx_pcm_close,
 	.ioctl		= snd_pcm_lib_ioctl,
 	.hw_params	= ep93xx_pcm_hw_params,
 	.hw_free	= ep93xx_pcm_hw_free,
 	.trigger	= ep93xx_pcm_trigger,
 	.pointer	= ep93xx_pcm_pointer,
 	.mmap		= ep93xx_pcm_mmap,
 };

 static int ep93xx_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 = ep93xx_pcm_hardware.buffer_bytes_max;

 	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);
 	buf->bytes = size;

 	return (buf->area == NULL) ? -ENOMEM : 0;
 }

 static void ep93xx_pcm_free_dma_buffers(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;
 	}
 }

 static u64 ep93xx_pcm_dmamask = 0xffffffff;

 static int ep93xx_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
 			  struct snd_pcm *pcm)
 {
 	int ret = 0;

 	if (!card->dev->dma_mask)
 		card->dev->dma_mask = &ep93xx_pcm_dmamask;
 	if (!card->dev->coherent_dma_mask)
 		card->dev->coherent_dma_mask = 0xffffffff;

 	if (dai->driver->playback.channels_min) {
 		ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
 					SNDRV_PCM_STREAM_PLAYBACK);
 		if (ret)
 			return ret;
 	}

 	if (dai->driver->capture.channels_min) {
 		ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
 					SNDRV_PCM_STREAM_CAPTURE);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static struct snd_soc_platform_driver ep93xx_soc_platform = {
 	.ops		= &ep93xx_pcm_ops,
 	.pcm_new	= &ep93xx_pcm_new,
 	.pcm_free	= &ep93xx_pcm_free_dma_buffers,
 };

 static int __devinit ep93xx_soc_platform_probe(struct platform_device *pdev)
 {
 	return snd_soc_register_platform(&pdev->dev, &ep93xx_soc_platform);
 }

 static int __devexit ep93xx_soc_platform_remove(struct platform_device *pdev)
 {
 	snd_soc_unregister_platform(&pdev->dev);
 	return 0;
 }

 static struct platform_driver ep93xx_pcm_driver = {
 	.driver = {
 			.name = "ep93xx-pcm-audio",
 			.owner = THIS_MODULE,
 	},

 	.probe = ep93xx_soc_platform_probe,
 	.remove = __devexit_p(ep93xx_soc_platform_remove),
 };

 static int __init ep93xx_soc_platform_init(void)
 {
 	return platform_driver_register(&ep93xx_pcm_driver);
 }

 static void __exit ep93xx_soc_platform_exit(void)
 {
 	platform_driver_unregister(&ep93xx_pcm_driver);
 }

 module_init(ep93xx_soc_platform_init);
 module_exit(ep93xx_soc_platform_exit);

 MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com>");
 MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
 MODULE_LICENSE("GPL");
	/*
	* linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
	*
	* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
	* Copyright (C) 2006 Applied Data Systems
	*
	* Rewritten for the SoC audio subsystem (Based on PXA2xx code):
	* Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com>
	*
	* 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 <linux/module.h>
	#include <linux/init.h>
	#include <linux/device.h>
	#include <linux/slab.h>
	#include <linux/dma-mapping.h>

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

	#include <mach/dma.h>
	#include <mach/hardware.h>
	#include <mach/ep93xx-regs.h>

	#include "ep93xx-pcm.h"

	static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
	.info = (SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER),

	.rates = SNDRV_PCM_RATE_8000_48000,
	.rate_min = SNDRV_PCM_RATE_8000,
	.rate_max = SNDRV_PCM_RATE_48000,

	.formats = (SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S24_LE \|
	SNDRV_PCM_FMTBIT_S32_LE),

	.buffer_bytes_max = 131072,
	.period_bytes_min = 32,
	.period_bytes_max = 32768,
	.periods_min = 1,
	.periods_max = 32,
	.fifo_size = 32,
	};

	struct ep93xx_runtime_data
	{
	struct ep93xx_dma_m2p_client cl;
	struct ep93xx_pcm_dma_params *params;
	int pointer_bytes;
	struct tasklet_struct period_tasklet;
	int periods;
	struct ep93xx_dma_buffer buf[32];
	};

	static void ep93xx_pcm_period_elapsed(unsigned long data)
	{
	struct snd_pcm_substream substream = (struct snd_pcm_substream )data;
	snd_pcm_period_elapsed(substream);
	}

	static void ep93xx_pcm_buffer_started(void *cookie,
	struct ep93xx_dma_buffer *buf)
	{
	}

	static void ep93xx_pcm_buffer_finished(void *cookie,
	struct ep93xx_dma_buffer *buf,
	int bytes, int error)
	{
	struct snd_pcm_substream *substream = cookie;
	struct ep93xx_runtime_data *rtd = substream->runtime->private_data;

	if (buf == rtd->buf + rtd->periods - 1)
	rtd->pointer_bytes = 0;
	else
	rtd->pointer_bytes += buf->size;

	if (!error) {
	ep93xx_dma_m2p_submit_recursive(&rtd->cl, buf);
	tasklet_schedule(&rtd->period_tasklet);
	} else {
	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
	}
	}

	static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *soc_rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = soc_rtd->cpu_dai;
	struct ep93xx_pcm_dma_params *dma_params;
	struct ep93xx_runtime_data *rtd;
	int ret;

	dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
	snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);

	rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
	if (!rtd)
	return -ENOMEM;

	memset(&rtd->period_tasklet, 0, sizeof(rtd->period_tasklet));
	rtd->period_tasklet.func = ep93xx_pcm_period_elapsed;
	rtd->period_tasklet.data = (unsigned long)substream;

	rtd->cl.name = dma_params->name;
	rtd->cl.flags = dma_params->dma_port \| EP93XX_DMA_M2P_IGNORE_ERROR \|
	((substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
	EP93XX_DMA_M2P_TX : EP93XX_DMA_M2P_RX);
	rtd->cl.cookie = substream;
	rtd->cl.buffer_started = ep93xx_pcm_buffer_started;
	rtd->cl.buffer_finished = ep93xx_pcm_buffer_finished;
	ret = ep93xx_dma_m2p_client_register(&rtd->cl);
	if (ret < 0) {
	kfree(rtd);
	return ret;
	}

	substream->runtime->private_data = rtd;
	return 0;
	}

	static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
	{
	struct ep93xx_runtime_data *rtd = substream->runtime->private_data;

	ep93xx_dma_m2p_client_unregister(&rtd->cl);
	kfree(rtd);
	return 0;
	}

	static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct ep93xx_runtime_data *rtd = runtime->private_data;
	size_t totsize = params_buffer_bytes(params);
	size_t period = params_period_bytes(params);
	int i;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = totsize;

	rtd->periods = (totsize + period - 1) / period;
	for (i = 0; i < rtd->periods; i++) {
	rtd->buf[i].bus_addr = runtime->dma_addr + (i * period);
	rtd->buf[i].size = period;
	if ((i + 1) * period > totsize)
	rtd->buf[i].size = totsize - (i * period);
	}

	return 0;
	}

	static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
	{
	snd_pcm_set_runtime_buffer(substream, NULL);
	return 0;
	}

	static int ep93xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
	int ret;
	int i;

	ret = 0;
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	rtd->pointer_bytes = 0;
	for (i = 0; i < rtd->periods; i++)
	ep93xx_dma_m2p_submit(&rtd->cl, rtd->buf + i);
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	ep93xx_dma_m2p_flush(&rtd->cl);
	break;

	default:
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	static snd_pcm_uframes_t ep93xx_pcm_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct ep93xx_runtime_data *rtd = substream->runtime->private_data;

	/* FIXME: implement this with sub-period granularity */
	return bytes_to_frames(runtime, rtd->pointer_bytes);
	}

	static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;

	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	runtime->dma_area,
	runtime->dma_addr,
	runtime->dma_bytes);
	}

	static struct snd_pcm_ops ep93xx_pcm_ops = {
	.open = ep93xx_pcm_open,
	.close = ep93xx_pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = ep93xx_pcm_hw_params,
	.hw_free = ep93xx_pcm_hw_free,
	.trigger = ep93xx_pcm_trigger,
	.pointer = ep93xx_pcm_pointer,
	.mmap = ep93xx_pcm_mmap,
	};

	static int ep93xx_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 = ep93xx_pcm_hardware.buffer_bytes_max;

	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);
	buf->bytes = size;

	return (buf->area == NULL) ? -ENOMEM : 0;
	}

	static void ep93xx_pcm_free_dma_buffers(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;
	}
	}

	static u64 ep93xx_pcm_dmamask = 0xffffffff;

	static int ep93xx_pcm_new(struct snd_card card, struct snd_soc_dai dai,
	struct snd_pcm *pcm)
	{
	int ret = 0;

	if (!card->dev->dma_mask)
	card->dev->dma_mask = &ep93xx_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
	card->dev->coherent_dma_mask = 0xffffffff;

	if (dai->driver->playback.channels_min) {
	ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
	SNDRV_PCM_STREAM_PLAYBACK);
	if (ret)
	return ret;
	}

	if (dai->driver->capture.channels_min) {
	ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
	SNDRV_PCM_STREAM_CAPTURE);
	if (ret)
	return ret;
	}

	return 0;
	}

	static struct snd_soc_platform_driver ep93xx_soc_platform = {
	.ops = &ep93xx_pcm_ops,
	.pcm_new = &ep93xx_pcm_new,
	.pcm_free = &ep93xx_pcm_free_dma_buffers,
	};

	static int __devinit ep93xx_soc_platform_probe(struct platform_device *pdev)
	{
	return snd_soc_register_platform(&pdev->dev, &ep93xx_soc_platform);
	}

	static int __devexit ep93xx_soc_platform_remove(struct platform_device *pdev)
	{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
	}

	static struct platform_driver ep93xx_pcm_driver = {
	.driver = {
	.name = "ep93xx-pcm-audio",
	.owner = THIS_MODULE,
	},

	.probe = ep93xx_soc_platform_probe,
	.remove = __devexit_p(ep93xx_soc_platform_remove),
	};

	static int __init ep93xx_soc_platform_init(void)
	{
	return platform_driver_register(&ep93xx_pcm_driver);
	}

	static void __exit ep93xx_soc_platform_exit(void)
	{
	platform_driver_unregister(&ep93xx_pcm_driver);
	}

	module_init(ep93xx_soc_platform_init);
	module_exit(ep93xx_soc_platform_exit);

	MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com>");
	MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
	MODULE_LICENSE("GPL");