sound/soc/imx/imx-pcm-dma-mx2.c - kernel/skids - 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 <sound/core.h>
 #include <sound/initval.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>

 #include <mach/dma-mx1-mx2.h>

 #include "imx-ssi.h"

 struct imx_pcm_runtime_data {
 	int sg_count;
 	struct scatterlist *sg_list;
 	int period;
 	int periods;
 	unsigned long dma_addr;
 	int dma;
 	struct snd_pcm_substream *substream;
 	unsigned long offset;
 	unsigned long size;
 	unsigned long period_cnt;
 	void *buf;
 	int period_time;
 };

 /* Called by the DMA framework when a period has elapsed */
 static void imx_ssi_dma_progression(int channel, void *data,
 					struct scatterlist *sg)
 {
 	struct snd_pcm_substream *substream = data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

 	if (!sg)
 		return;

 	runtime = iprtd->substream->runtime;

 	iprtd->offset = sg->dma_address - runtime->dma_addr;

 	snd_pcm_period_elapsed(iprtd->substream);
 }

 static void imx_ssi_dma_callback(int channel, void *data)
 {
 	pr_err("%s shouldn't be called\n", __func__);
 }

 static void snd_imx_dma_err_callback(int channel, void *data, int err)
 {
 	struct snd_pcm_substream *substream = data;
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct imx_pcm_dma_params *dma_params =
 		snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 	int ret;

 	pr_err("DMA timeout on channel %d -%s%s%s%s\n",
 		 channel,
 		 err & IMX_DMA_ERR_BURST ?    " burst" : "",
 		 err & IMX_DMA_ERR_REQUEST ?  " request" : "",
 		 err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
 		 err & IMX_DMA_ERR_BUFFER ?   " buffer" : "");

 	imx_dma_disable(iprtd->dma);
 	ret = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
 			IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
 			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 			DMA_MODE_WRITE : DMA_MODE_READ);
 	if (!ret)
 		imx_dma_enable(iprtd->dma);
 }

 static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
 {
 	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;
 	int ret;

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

 	iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
 	if (iprtd->dma < 0) {
 		pr_err("Failed to claim the audio DMA\n");
 		return -ENODEV;
 	}

 	ret = imx_dma_setup_handlers(iprtd->dma,
 				imx_ssi_dma_callback,
 				snd_imx_dma_err_callback, substream);
 	if (ret)
 		goto out;

 	ret = imx_dma_setup_progression_handler(iprtd->dma,
 			imx_ssi_dma_progression);
 	if (ret) {
 		pr_err("Failed to setup the DMA handler\n");
 		goto out;
 	}

 	ret = imx_dma_config_channel(iprtd->dma,
 			IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
 			IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
 			dma_params->dma, 1);
 	if (ret < 0) {
 		pr_err("Cannot configure DMA channel: %d\n", ret);
 		goto out;
 	}

 	imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);

 	return 0;
 out:
 	imx_dma_free(iprtd->dma);
 	return ret;
 }

 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 	int i;
 	unsigned long dma_addr;

 	imx_ssi_dma_alloc(substream);

 	iprtd->size = params_buffer_bytes(params);
 	iprtd->periods = params_periods(params);
 	iprtd->period = 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);

 	if (iprtd->sg_count != iprtd->periods) {
 		kfree(iprtd->sg_list);

 		iprtd->sg_list = kcalloc(iprtd->periods + 1,
 				sizeof(struct scatterlist), GFP_KERNEL);
 		if (!iprtd->sg_list)
 			return -ENOMEM;
 		iprtd->sg_count = iprtd->periods + 1;
 	}

 	sg_init_table(iprtd->sg_list, iprtd->sg_count);
 	dma_addr = runtime->dma_addr;

 	for (i = 0; i < iprtd->periods; i++) {
 		iprtd->sg_list[i].page_link = 0;
 		iprtd->sg_list[i].offset = 0;
 		iprtd->sg_list[i].dma_address = dma_addr;
 		iprtd->sg_list[i].length = iprtd->period;
 		dma_addr += iprtd->period;
 	}

 	/* close the loop */
 	iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
 	iprtd->sg_list[iprtd->sg_count - 1].length = 0;
 	iprtd->sg_list[iprtd->sg_count - 1].page_link =
 			((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
 	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 >= 0) {
 		imx_dma_free(iprtd->dma);
 		iprtd->dma = -EINVAL;
 	}

 	kfree(iprtd->sg_list);
 	iprtd->sg_list = NULL;

 	return 0;
 }

 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct imx_pcm_dma_params *dma_params;
 	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 	int err;

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

 	iprtd->substream = substream;
 	iprtd->buf = (unsigned int *)substream->dma_buffer.area;
 	iprtd->period_cnt = 0;

 	pr_debug("%s: buf: %p period: %d periods: %d\n",
 			__func__, iprtd->buf, iprtd->period, iprtd->periods);

 	err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
 			IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
 			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 			DMA_MODE_WRITE : DMA_MODE_READ);
 	if (err)
 		return err;

 	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:
 		imx_dma_enable(iprtd->dma);

 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		imx_dma_disable(iprtd->dma);

 		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;

 	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 = 16 * 1024,
 	.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);
 	runtime->private_data = iprtd;

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

 	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 	return 0;
 }

 static struct snd_pcm_ops imx_pcm_ops = {
 	.open		= snd_imx_open,
 	.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 imx_soc_platform_dma = {
 	.name		= "imx-audio",
 	.pcm_ops 	= &imx_pcm_ops,
 	.pcm_new	= imx_pcm_new,
 	.pcm_free	= imx_pcm_free,
 };

 struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
 		struct imx_ssi *ssi)
 {
 	ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
 	ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;

 	return &imx_soc_platform_dma;
 }
	/*
	* 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 <sound/core.h>
	#include <sound/initval.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>

	#include <mach/dma-mx1-mx2.h>

	#include "imx-ssi.h"

	struct imx_pcm_runtime_data {
	int sg_count;
	struct scatterlist *sg_list;
	int period;
	int periods;
	unsigned long dma_addr;
	int dma;
	struct snd_pcm_substream *substream;
	unsigned long offset;
	unsigned long size;
	unsigned long period_cnt;
	void *buf;
	int period_time;
	};

	/* Called by the DMA framework when a period has elapsed */
	static void imx_ssi_dma_progression(int channel, void *data,
	struct scatterlist *sg)
	{
	struct snd_pcm_substream *substream = data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	if (!sg)
	return;

	runtime = iprtd->substream->runtime;

	iprtd->offset = sg->dma_address - runtime->dma_addr;

	snd_pcm_period_elapsed(iprtd->substream);
	}

	static void imx_ssi_dma_callback(int channel, void *data)
	{
	pr_err("%s shouldn't be called\n", __func__);
	}

	static void snd_imx_dma_err_callback(int channel, void *data, int err)
	{
	struct snd_pcm_substream *substream = data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params =
	snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int ret;

	pr_err("DMA timeout on channel %d -%s%s%s%s\n",
	channel,
	err & IMX_DMA_ERR_BURST ? " burst" : "",
	err & IMX_DMA_ERR_REQUEST ? " request" : "",
	err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
	err & IMX_DMA_ERR_BUFFER ? " buffer" : "");

	imx_dma_disable(iprtd->dma);
	ret = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
	IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
	substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
	DMA_MODE_WRITE : DMA_MODE_READ);
	if (!ret)
	imx_dma_enable(iprtd->dma);
	}

	static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
	{
	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;
	int ret;

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

	iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
	if (iprtd->dma < 0) {
	pr_err("Failed to claim the audio DMA\n");
	return -ENODEV;
	}

	ret = imx_dma_setup_handlers(iprtd->dma,
	imx_ssi_dma_callback,
	snd_imx_dma_err_callback, substream);
	if (ret)
	goto out;

	ret = imx_dma_setup_progression_handler(iprtd->dma,
	imx_ssi_dma_progression);
	if (ret) {
	pr_err("Failed to setup the DMA handler\n");
	goto out;
	}

	ret = imx_dma_config_channel(iprtd->dma,
	IMX_DMA_MEMSIZE_16 \| IMX_DMA_TYPE_FIFO,
	IMX_DMA_MEMSIZE_32 \| IMX_DMA_TYPE_LINEAR,
	dma_params->dma, 1);
	if (ret < 0) {
	pr_err("Cannot configure DMA channel: %d\n", ret);
	goto out;
	}

	imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);

	return 0;
	out:
	imx_dma_free(iprtd->dma);
	return ret;
	}

	static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int i;
	unsigned long dma_addr;

	imx_ssi_dma_alloc(substream);

	iprtd->size = params_buffer_bytes(params);
	iprtd->periods = params_periods(params);
	iprtd->period = 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);

	if (iprtd->sg_count != iprtd->periods) {
	kfree(iprtd->sg_list);

	iprtd->sg_list = kcalloc(iprtd->periods + 1,
	sizeof(struct scatterlist), GFP_KERNEL);
	if (!iprtd->sg_list)
	return -ENOMEM;
	iprtd->sg_count = iprtd->periods + 1;
	}

	sg_init_table(iprtd->sg_list, iprtd->sg_count);
	dma_addr = runtime->dma_addr;

	for (i = 0; i < iprtd->periods; i++) {
	iprtd->sg_list[i].page_link = 0;
	iprtd->sg_list[i].offset = 0;
	iprtd->sg_list[i].dma_address = dma_addr;
	iprtd->sg_list[i].length = iprtd->period;
	dma_addr += iprtd->period;
	}

	/* close the loop */
	iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
	iprtd->sg_list[iprtd->sg_count - 1].length = 0;
	iprtd->sg_list[iprtd->sg_count - 1].page_link =
	((unsigned long) iprtd->sg_list \| 0x01) & ~0x02;
	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 >= 0) {
	imx_dma_free(iprtd->dma);
	iprtd->dma = -EINVAL;
	}

	kfree(iprtd->sg_list);
	iprtd->sg_list = NULL;

	return 0;
	}

	static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int err;

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

	iprtd->substream = substream;
	iprtd->buf = (unsigned int *)substream->dma_buffer.area;
	iprtd->period_cnt = 0;

	pr_debug("%s: buf: %p period: %d periods: %d\n",
	__func__, iprtd->buf, iprtd->period, iprtd->periods);

	err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
	IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
	substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
	DMA_MODE_WRITE : DMA_MODE_READ);
	if (err)
	return err;

	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:
	imx_dma_enable(iprtd->dma);

	break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	imx_dma_disable(iprtd->dma);

	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;

	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 = 16 * 1024,
	.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);
	runtime->private_data = iprtd;

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

	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
	return 0;
	}

	static struct snd_pcm_ops imx_pcm_ops = {
	.open = snd_imx_open,
	.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 imx_soc_platform_dma = {
	.name = "imx-audio",
	.pcm_ops = &imx_pcm_ops,
	.pcm_new = imx_pcm_new,
	.pcm_free = imx_pcm_free,
	};

	struct snd_soc_platform imx_ssi_dma_mx2_init(struct platform_device pdev,
	struct imx_ssi *ssi)
	{
	ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
	ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;

	return &imx_soc_platform_dma;
	}