sound/hda/ext/hdac_ext_stream.c - kernel/msm-4.19 - Gitiles

 /*
  *  hdac-ext-stream.c - HD-audio extended stream operations.
  *
  *  Copyright (C) 2015 Intel Corp
  *  Author: Jeeja KP <jeeja.kp@intel.com>
  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  *  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; version 2 of the License.
  *
  *  This program is distributed in the hope that it will be useful, but
  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  General Public License for more details.
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */

 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <sound/pcm.h>
 #include <sound/hda_register.h>
 #include <sound/hdaudio_ext.h>

 /**
  * snd_hdac_ext_stream_init - initialize each stream (aka device)
  * @ebus: HD-audio ext core bus
  * @stream: HD-audio ext core stream object to initialize
  * @idx: stream index number
  * @direction: stream direction (SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE)
  * @tag: the tag id to assign
  *
  * initialize the stream, if ppcap is enabled then init those and then
  * invoke hdac stream initialization routine
  */
 void snd_hdac_ext_stream_init(struct hdac_ext_bus *ebus,
 				struct hdac_ext_stream *stream,
 				int idx, int direction, int tag)
 {
 	struct hdac_bus *bus = &ebus->bus;

 	if (ebus->ppcap) {
 		stream->pphc_addr = ebus->ppcap + AZX_PPHC_BASE +
 				AZX_PPHC_INTERVAL * idx;

 		stream->pplc_addr = ebus->ppcap + AZX_PPLC_BASE +
 				AZX_PPLC_MULTI * ebus->num_streams +
 				AZX_PPLC_INTERVAL * idx;
 	}

 	stream->decoupled = false;
 	snd_hdac_stream_init(bus, &stream->hstream, idx, direction, tag);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init);

 /**
  * snd_hdac_ext_stream_init_all - create and initialize the stream objects
  *   for an extended hda bus
  * @ebus: HD-audio ext core bus
  * @start_idx: start index for streams
  * @num_stream: number of streams to initialize
  * @dir: direction of streams
  */
 int snd_hdac_ext_stream_init_all(struct hdac_ext_bus *ebus, int start_idx,
 		int num_stream, int dir)
 {
 	int stream_tag = 0;
 	int i, tag, idx = start_idx;

 	for (i = 0; i < num_stream; i++) {
 		struct hdac_ext_stream *stream =
 				kzalloc(sizeof(*stream), GFP_KERNEL);
 		if (!stream)
 			return -ENOMEM;
 		tag = ++stream_tag;
 		snd_hdac_ext_stream_init(ebus, stream, idx, dir, tag);
 		idx++;
 	}

 	return 0;

 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init_all);

 /**
  * snd_hdac_stream_free_all - free hdac extended stream objects
  *
  * @ebus: HD-audio ext core bus
  */
 void snd_hdac_stream_free_all(struct hdac_ext_bus *ebus)
 {
 	struct hdac_stream *s;
 	struct hdac_ext_stream *stream;
 	struct hdac_bus *bus = ebus_to_hbus(ebus);

 	while (!list_empty(&bus->stream_list)) {
 		s = list_first_entry(&bus->stream_list, struct hdac_stream, list);
 		stream = stream_to_hdac_ext_stream(s);
 		list_del(&s->list);
 		kfree(stream);
 	}
 }
 EXPORT_SYMBOL_GPL(snd_hdac_stream_free_all);

 /**
  * snd_hdac_ext_stream_decouple - decouple the hdac stream
  * @ebus: HD-audio ext core bus
  * @stream: HD-audio ext core stream object to initialize
  * @decouple: flag to decouple
  */
 void snd_hdac_ext_stream_decouple(struct hdac_ext_bus *ebus,
 				struct hdac_ext_stream *stream, bool decouple)
 {
 	struct hdac_stream *hstream = &stream->hstream;
 	struct hdac_bus *bus = &ebus->bus;

 	spin_lock_irq(&bus->reg_lock);
 	if (decouple)
 		snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0,
 				AZX_PPCTL_PROCEN(hstream->index));
 	else
 		snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL,
 					AZX_PPCTL_PROCEN(hstream->index), 0);
 	stream->decoupled = decouple;
 	spin_unlock_irq(&bus->reg_lock);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple);

 /**
  * snd_hdac_ext_linkstream_start - start a stream
  * @stream: HD-audio ext core stream to start
  */
 void snd_hdac_ext_link_stream_start(struct hdac_ext_stream *stream)
 {
 	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, 0, AZX_PPLCCTL_RUN);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_start);

 /**
  * snd_hdac_ext_link_stream_clear - stop a stream DMA
  * @stream: HD-audio ext core stream to stop
  */
 void snd_hdac_ext_link_stream_clear(struct hdac_ext_stream *stream)
 {
 	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, AZX_PPLCCTL_RUN, 0);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_clear);

 /**
  * snd_hdac_ext_link_stream_reset - reset a stream
  * @stream: HD-audio ext core stream to reset
  */
 void snd_hdac_ext_link_stream_reset(struct hdac_ext_stream *stream)
 {
 	unsigned char val;
 	int timeout;

 	snd_hdac_ext_link_stream_clear(stream);

 	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, 0, AZX_PPLCCTL_STRST);
 	udelay(3);
 	timeout = 50;
 	do {
 		val = readl(stream->pplc_addr + AZX_REG_PPLCCTL) &
 				AZX_PPLCCTL_STRST;
 		if (val)
 			break;
 		udelay(3);
 	} while (--timeout);
 	val &= ~AZX_PPLCCTL_STRST;
 	writel(val, stream->pplc_addr + AZX_REG_PPLCCTL);
 	udelay(3);

 	timeout = 50;
 	/* waiting for hardware to report that the stream is out of reset */
 	do {
 		val = readl(stream->pplc_addr + AZX_REG_PPLCCTL) & AZX_PPLCCTL_STRST;
 		if (!val)
 			break;
 		udelay(3);
 	} while (--timeout);

 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_reset);

 /**
  * snd_hdac_ext_link_stream_setup -  set up the SD for streaming
  * @stream: HD-audio ext core stream to set up
  * @fmt: stream format
  */
 int snd_hdac_ext_link_stream_setup(struct hdac_ext_stream *stream, int fmt)
 {
 	struct hdac_stream *hstream = &stream->hstream;
 	unsigned int val;

 	/* make sure the run bit is zero for SD */
 	snd_hdac_ext_link_stream_clear(stream);
 	/* program the stream_tag */
 	val = readl(stream->pplc_addr + AZX_REG_PPLCCTL);
 	val = (val & ~AZX_PPLCCTL_STRM_MASK) |
 		(hstream->stream_tag << AZX_PPLCCTL_STRM_SHIFT);
 	writel(val, stream->pplc_addr + AZX_REG_PPLCCTL);

 	/* program the stream format */
 	writew(fmt, stream->pplc_addr + AZX_REG_PPLCFMT);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_setup);

 /**
  * snd_hdac_ext_link_set_stream_id - maps stream id to link output
  * @link: HD-audio ext link to set up
  * @stream: stream id
  */
 void snd_hdac_ext_link_set_stream_id(struct hdac_ext_link *link,
 				 int stream)
 {
 	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, (1 << stream), 0);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_link_set_stream_id);

 /**
  * snd_hdac_ext_link_clear_stream_id - maps stream id to link output
  * @link: HD-audio ext link to set up
  * @stream: stream id
  */
 void snd_hdac_ext_link_clear_stream_id(struct hdac_ext_link *link,
 				 int stream)
 {
 	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, 0, (1 << stream));
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_link_clear_stream_id);

 static struct hdac_ext_stream *
 hdac_ext_link_stream_assign(struct hdac_ext_bus *ebus,
 				struct snd_pcm_substream *substream)
 {
 	struct hdac_ext_stream *res = NULL;
 	struct hdac_stream *stream = NULL;
 	struct hdac_bus *hbus = &ebus->bus;

 	if (!ebus->ppcap) {
 		dev_err(hbus->dev, "stream type not supported\n");
 		return NULL;
 	}

 	list_for_each_entry(stream, &hbus->stream_list, list) {
 		struct hdac_ext_stream *hstream = container_of(stream,
 						struct hdac_ext_stream,
 						hstream);
 		if (stream->direction != substream->stream)
 			continue;

 		/* check if decoupled stream and not in use is available */
 		if (hstream->decoupled && !hstream->link_locked) {
 			res = hstream;
 			break;
 		}

 		if (!hstream->link_locked) {
 			snd_hdac_ext_stream_decouple(ebus, hstream, true);
 			res = hstream;
 			break;
 		}
 	}
 	if (res) {
 		spin_lock_irq(&hbus->reg_lock);
 		res->link_locked = 1;
 		res->link_substream = substream;
 		spin_unlock_irq(&hbus->reg_lock);
 	}
 	return res;
 }

 static struct hdac_ext_stream *
 hdac_ext_host_stream_assign(struct hdac_ext_bus *ebus,
 				struct snd_pcm_substream *substream)
 {
 	struct hdac_ext_stream *res = NULL;
 	struct hdac_stream *stream = NULL;
 	struct hdac_bus *hbus = &ebus->bus;
 	int key;

 	if (!ebus->ppcap) {
 		dev_err(hbus->dev, "stream type not supported\n");
 		return NULL;
 	}

 	/* make a non-zero unique key for the substream */
 	key = (substream->pcm->device << 16) | (substream->number << 2) |
 			(substream->stream + 1);

 	list_for_each_entry(stream, &hbus->stream_list, list) {
 		struct hdac_ext_stream *hstream = container_of(stream,
 						struct hdac_ext_stream,
 						hstream);
 		if (stream->direction != substream->stream)
 			continue;

 		if (stream->opened) {
 			if (!hstream->decoupled)
 				snd_hdac_ext_stream_decouple(ebus, hstream, true);
 			res = hstream;
 			break;
 		}
 	}
 	if (res) {
 		spin_lock_irq(&hbus->reg_lock);
 		res->hstream.opened = 1;
 		res->hstream.running = 0;
 		res->hstream.assigned_key = key;
 		res->hstream.substream = substream;
 		spin_unlock_irq(&hbus->reg_lock);
 	}

 	return res;
 }

 /**
  * snd_hdac_ext_stream_assign - assign a stream for the PCM
  * @ebus: HD-audio ext core bus
  * @substream: PCM substream to assign
  * @type: type of stream (coupled, host or link stream)
  *
  * This assigns the stream based on the type (coupled/host/link), for the
  * given PCM substream, assigns it and returns the stream object
  *
  * coupled: Looks for an unused stream
  * host: Looks for an unused decoupled host stream
  * link: Looks for an unused decoupled link stream
  *
  * If no stream is free, returns NULL. The function tries to keep using
  * the same stream object when it's used beforehand.  when a stream is
  * decoupled, it becomes a host stream and link stream.
  */
 struct hdac_ext_stream *snd_hdac_ext_stream_assign(struct hdac_ext_bus *ebus,
 					   struct snd_pcm_substream *substream,
 					   int type)
 {
 	struct hdac_ext_stream *hstream = NULL;
 	struct hdac_stream *stream = NULL;
 	struct hdac_bus *hbus = &ebus->bus;

 	switch (type) {
 	case HDAC_EXT_STREAM_TYPE_COUPLED:
 		stream = snd_hdac_stream_assign(hbus, substream);
 		if (stream)
 			hstream = container_of(stream,
 					struct hdac_ext_stream, hstream);
 		return hstream;

 	case HDAC_EXT_STREAM_TYPE_HOST:
 		return hdac_ext_host_stream_assign(ebus, substream);

 	case HDAC_EXT_STREAM_TYPE_LINK:
 		return hdac_ext_link_stream_assign(ebus, substream);

 	default:
 		return NULL;
 	}
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_assign);

 /**
  * snd_hdac_ext_stream_release - release the assigned stream
  * @stream: HD-audio ext core stream to release
  * @type: type of stream (coupled, host or link stream)
  *
  * Release the stream that has been assigned by snd_hdac_ext_stream_assign().
  */
 void snd_hdac_ext_stream_release(struct hdac_ext_stream *stream, int type)
 {
 	struct hdac_bus *bus = stream->hstream.bus;
 	struct hdac_ext_bus *ebus = hbus_to_ebus(bus);

 	switch (type) {
 	case HDAC_EXT_STREAM_TYPE_COUPLED:
 		snd_hdac_stream_release(&stream->hstream);
 		break;

 	case HDAC_EXT_STREAM_TYPE_HOST:
 		if (stream->decoupled) {
 			snd_hdac_ext_stream_decouple(ebus, stream, false);
 			snd_hdac_stream_release(&stream->hstream);
 		}
 		break;

 	case HDAC_EXT_STREAM_TYPE_LINK:
 		if (stream->decoupled)
 			snd_hdac_ext_stream_decouple(ebus, stream, false);
 		spin_lock_irq(&bus->reg_lock);
 		stream->link_locked = 0;
 		stream->link_substream = NULL;
 		spin_unlock_irq(&bus->reg_lock);
 		break;

 	default:
 		dev_dbg(bus->dev, "Invalid type %d\n", type);
 	}

 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_release);

 /**
  * snd_hdac_ext_stream_spbcap_enable - enable SPIB for a stream
  * @ebus: HD-audio ext core bus
  * @enable: flag to enable/disable SPIB
  * @index: stream index for which SPIB need to be enabled
  */
 void snd_hdac_ext_stream_spbcap_enable(struct hdac_ext_bus *ebus,
 				 bool enable, int index)
 {
 	u32 mask = 0;
 	u32 register_mask = 0;
 	struct hdac_bus *bus = &ebus->bus;

 	if (!ebus->spbcap) {
 		dev_err(bus->dev, "Address of SPB capability is NULL");
 		return;
 	}

 	mask |= (1 << index);

 	register_mask = snd_hdac_chip_readl(bus, SPB_SPBFCCTL);

 	mask |= register_mask;

 	if (enable)
 		snd_hdac_updatel(ebus->spbcap, AZX_REG_SPB_SPBFCCTL, 0, mask);
 	else
 		snd_hdac_updatel(ebus->spbcap, AZX_REG_SPB_SPBFCCTL, mask, 0);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_spbcap_enable);

 /**
  * snd_hdac_ext_stop_streams - stop all stream if running
  * @ebus: HD-audio ext core bus
  */
 void snd_hdac_ext_stop_streams(struct hdac_ext_bus *ebus)
 {
 	struct hdac_bus *bus = ebus_to_hbus(ebus);
 	struct hdac_stream *stream;

 	if (bus->chip_init) {
 		list_for_each_entry(stream, &bus->stream_list, list)
 			snd_hdac_stream_stop(stream);
 		snd_hdac_bus_stop_chip(bus);
 	}
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_stop_streams);
	/*
	* hdac-ext-stream.c - HD-audio extended stream operations.
	*
	* Copyright (C) 2015 Intel Corp
	* Author: Jeeja KP <jeeja.kp@intel.com>
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* 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; version 2 of the License.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*/

	#include <linux/delay.h>
	#include <linux/slab.h>
	#include <sound/pcm.h>
	#include <sound/hda_register.h>
	#include <sound/hdaudio_ext.h>

	/**
	* snd_hdac_ext_stream_init - initialize each stream (aka device)
	* @ebus: HD-audio ext core bus
	* @stream: HD-audio ext core stream object to initialize
	* @idx: stream index number
	* @direction: stream direction (SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE)
	* @tag: the tag id to assign
	*
	* initialize the stream, if ppcap is enabled then init those and then
	* invoke hdac stream initialization routine
	*/
	void snd_hdac_ext_stream_init(struct hdac_ext_bus *ebus,
	struct hdac_ext_stream *stream,
	int idx, int direction, int tag)
	{
	struct hdac_bus *bus = &ebus->bus;

	if (ebus->ppcap) {
	stream->pphc_addr = ebus->ppcap + AZX_PPHC_BASE +
	AZX_PPHC_INTERVAL * idx;

	stream->pplc_addr = ebus->ppcap + AZX_PPLC_BASE +
	AZX_PPLC_MULTI * ebus->num_streams +
	AZX_PPLC_INTERVAL * idx;
	}

	stream->decoupled = false;
	snd_hdac_stream_init(bus, &stream->hstream, idx, direction, tag);
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init);

	/**
	* snd_hdac_ext_stream_init_all - create and initialize the stream objects
	* for an extended hda bus
	* @ebus: HD-audio ext core bus
	* @start_idx: start index for streams
	* @num_stream: number of streams to initialize
	* @dir: direction of streams
	*/
	int snd_hdac_ext_stream_init_all(struct hdac_ext_bus *ebus, int start_idx,
	int num_stream, int dir)
	{
	int stream_tag = 0;
	int i, tag, idx = start_idx;

	for (i = 0; i < num_stream; i++) {
	struct hdac_ext_stream *stream =
	kzalloc(sizeof(*stream), GFP_KERNEL);
	if (!stream)
	return -ENOMEM;
	tag = ++stream_tag;
	snd_hdac_ext_stream_init(ebus, stream, idx, dir, tag);
	idx++;
	}

	return 0;

	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init_all);

	/**
	* snd_hdac_stream_free_all - free hdac extended stream objects
	*
	* @ebus: HD-audio ext core bus
	*/
	void snd_hdac_stream_free_all(struct hdac_ext_bus *ebus)
	{
	struct hdac_stream *s;
	struct hdac_ext_stream *stream;
	struct hdac_bus *bus = ebus_to_hbus(ebus);

	while (!list_empty(&bus->stream_list)) {
	s = list_first_entry(&bus->stream_list, struct hdac_stream, list);
	stream = stream_to_hdac_ext_stream(s);
	list_del(&s->list);
	kfree(stream);
	}
	}
	EXPORT_SYMBOL_GPL(snd_hdac_stream_free_all);

	/**
	* snd_hdac_ext_stream_decouple - decouple the hdac stream
	* @ebus: HD-audio ext core bus
	* @stream: HD-audio ext core stream object to initialize
	* @decouple: flag to decouple
	*/
	void snd_hdac_ext_stream_decouple(struct hdac_ext_bus *ebus,
	struct hdac_ext_stream *stream, bool decouple)
	{
	struct hdac_stream *hstream = &stream->hstream;
	struct hdac_bus *bus = &ebus->bus;

	spin_lock_irq(&bus->reg_lock);
	if (decouple)
	snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0,
	AZX_PPCTL_PROCEN(hstream->index));
	else
	snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL,
	AZX_PPCTL_PROCEN(hstream->index), 0);
	stream->decoupled = decouple;
	spin_unlock_irq(&bus->reg_lock);
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple);

	/**
	* snd_hdac_ext_linkstream_start - start a stream
	* @stream: HD-audio ext core stream to start
	*/
	void snd_hdac_ext_link_stream_start(struct hdac_ext_stream *stream)
	{
	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, 0, AZX_PPLCCTL_RUN);
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_start);

	/**
	* snd_hdac_ext_link_stream_clear - stop a stream DMA
	* @stream: HD-audio ext core stream to stop
	*/
	void snd_hdac_ext_link_stream_clear(struct hdac_ext_stream *stream)
	{
	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, AZX_PPLCCTL_RUN, 0);
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_clear);

	/**
	* snd_hdac_ext_link_stream_reset - reset a stream
	* @stream: HD-audio ext core stream to reset
	*/
	void snd_hdac_ext_link_stream_reset(struct hdac_ext_stream *stream)
	{
	unsigned char val;
	int timeout;

	snd_hdac_ext_link_stream_clear(stream);

	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, 0, AZX_PPLCCTL_STRST);
	udelay(3);
	timeout = 50;
	do {
	val = readl(stream->pplc_addr + AZX_REG_PPLCCTL) &
	AZX_PPLCCTL_STRST;
	if (val)
	break;
	udelay(3);
	} while (--timeout);
	val &= ~AZX_PPLCCTL_STRST;
	writel(val, stream->pplc_addr + AZX_REG_PPLCCTL);
	udelay(3);

	timeout = 50;
	/* waiting for hardware to report that the stream is out of reset */
	do {
	val = readl(stream->pplc_addr + AZX_REG_PPLCCTL) & AZX_PPLCCTL_STRST;
	if (!val)
	break;
	udelay(3);
	} while (--timeout);

	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_reset);

	/**
	* snd_hdac_ext_link_stream_setup - set up the SD for streaming
	* @stream: HD-audio ext core stream to set up
	* @fmt: stream format
	*/
	int snd_hdac_ext_link_stream_setup(struct hdac_ext_stream *stream, int fmt)
	{
	struct hdac_stream *hstream = &stream->hstream;
	unsigned int val;

	/* make sure the run bit is zero for SD */
	snd_hdac_ext_link_stream_clear(stream);
	/* program the stream_tag */
	val = readl(stream->pplc_addr + AZX_REG_PPLCCTL);
	val = (val & ~AZX_PPLCCTL_STRM_MASK) \|
	(hstream->stream_tag << AZX_PPLCCTL_STRM_SHIFT);
	writel(val, stream->pplc_addr + AZX_REG_PPLCCTL);

	/* program the stream format */
	writew(fmt, stream->pplc_addr + AZX_REG_PPLCFMT);

	return 0;
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_setup);

	/**
	* snd_hdac_ext_link_set_stream_id - maps stream id to link output
	* @link: HD-audio ext link to set up
	* @stream: stream id
	*/
	void snd_hdac_ext_link_set_stream_id(struct hdac_ext_link *link,
	int stream)
	{
	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, (1 << stream), 0);
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_set_stream_id);

	/**
	* snd_hdac_ext_link_clear_stream_id - maps stream id to link output
	* @link: HD-audio ext link to set up
	* @stream: stream id
	*/
	void snd_hdac_ext_link_clear_stream_id(struct hdac_ext_link *link,
	int stream)
	{
	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, 0, (1 << stream));
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_clear_stream_id);

	static struct hdac_ext_stream *
	hdac_ext_link_stream_assign(struct hdac_ext_bus *ebus,
	struct snd_pcm_substream *substream)
	{
	struct hdac_ext_stream *res = NULL;
	struct hdac_stream *stream = NULL;
	struct hdac_bus *hbus = &ebus->bus;

	if (!ebus->ppcap) {
	dev_err(hbus->dev, "stream type not supported\n");
	return NULL;
	}

	list_for_each_entry(stream, &hbus->stream_list, list) {
	struct hdac_ext_stream *hstream = container_of(stream,
	struct hdac_ext_stream,
	hstream);
	if (stream->direction != substream->stream)
	continue;

	/* check if decoupled stream and not in use is available */
	if (hstream->decoupled && !hstream->link_locked) {
	res = hstream;
	break;
	}

	if (!hstream->link_locked) {
	snd_hdac_ext_stream_decouple(ebus, hstream, true);
	res = hstream;
	break;
	}
	}
	if (res) {
	spin_lock_irq(&hbus->reg_lock);
	res->link_locked = 1;
	res->link_substream = substream;
	spin_unlock_irq(&hbus->reg_lock);
	}
	return res;
	}

	static struct hdac_ext_stream *
	hdac_ext_host_stream_assign(struct hdac_ext_bus *ebus,
	struct snd_pcm_substream *substream)
	{
	struct hdac_ext_stream *res = NULL;
	struct hdac_stream *stream = NULL;
	struct hdac_bus *hbus = &ebus->bus;
	int key;

	if (!ebus->ppcap) {
	dev_err(hbus->dev, "stream type not supported\n");
	return NULL;
	}

	/* make a non-zero unique key for the substream */
	key = (substream->pcm->device << 16) \| (substream->number << 2) \|
	(substream->stream + 1);

	list_for_each_entry(stream, &hbus->stream_list, list) {
	struct hdac_ext_stream *hstream = container_of(stream,
	struct hdac_ext_stream,
	hstream);
	if (stream->direction != substream->stream)
	continue;

	if (stream->opened) {
	if (!hstream->decoupled)
	snd_hdac_ext_stream_decouple(ebus, hstream, true);
	res = hstream;
	break;
	}
	}
	if (res) {
	spin_lock_irq(&hbus->reg_lock);
	res->hstream.opened = 1;
	res->hstream.running = 0;
	res->hstream.assigned_key = key;
	res->hstream.substream = substream;
	spin_unlock_irq(&hbus->reg_lock);
	}

	return res;
	}

	/**
	* snd_hdac_ext_stream_assign - assign a stream for the PCM
	* @ebus: HD-audio ext core bus
	* @substream: PCM substream to assign
	* @type: type of stream (coupled, host or link stream)
	*
	* This assigns the stream based on the type (coupled/host/link), for the
	* given PCM substream, assigns it and returns the stream object
	*
	* coupled: Looks for an unused stream
	* host: Looks for an unused decoupled host stream
	* link: Looks for an unused decoupled link stream
	*
	* If no stream is free, returns NULL. The function tries to keep using
	* the same stream object when it's used beforehand. when a stream is
	* decoupled, it becomes a host stream and link stream.
	*/
	struct hdac_ext_stream snd_hdac_ext_stream_assign(struct hdac_ext_bus ebus,
	struct snd_pcm_substream *substream,
	int type)
	{
	struct hdac_ext_stream *hstream = NULL;
	struct hdac_stream *stream = NULL;
	struct hdac_bus *hbus = &ebus->bus;

	switch (type) {
	case HDAC_EXT_STREAM_TYPE_COUPLED:
	stream = snd_hdac_stream_assign(hbus, substream);
	if (stream)
	hstream = container_of(stream,
	struct hdac_ext_stream, hstream);
	return hstream;

	case HDAC_EXT_STREAM_TYPE_HOST:
	return hdac_ext_host_stream_assign(ebus, substream);

	case HDAC_EXT_STREAM_TYPE_LINK:
	return hdac_ext_link_stream_assign(ebus, substream);

	default:
	return NULL;
	}
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_assign);

	/**
	* snd_hdac_ext_stream_release - release the assigned stream
	* @stream: HD-audio ext core stream to release
	* @type: type of stream (coupled, host or link stream)
	*
	* Release the stream that has been assigned by snd_hdac_ext_stream_assign().
	*/
	void snd_hdac_ext_stream_release(struct hdac_ext_stream *stream, int type)
	{
	struct hdac_bus *bus = stream->hstream.bus;
	struct hdac_ext_bus *ebus = hbus_to_ebus(bus);

	switch (type) {
	case HDAC_EXT_STREAM_TYPE_COUPLED:
	snd_hdac_stream_release(&stream->hstream);
	break;

	case HDAC_EXT_STREAM_TYPE_HOST:
	if (stream->decoupled) {
	snd_hdac_ext_stream_decouple(ebus, stream, false);
	snd_hdac_stream_release(&stream->hstream);
	}
	break;

	case HDAC_EXT_STREAM_TYPE_LINK:
	if (stream->decoupled)
	snd_hdac_ext_stream_decouple(ebus, stream, false);
	spin_lock_irq(&bus->reg_lock);
	stream->link_locked = 0;
	stream->link_substream = NULL;
	spin_unlock_irq(&bus->reg_lock);
	break;

	default:
	dev_dbg(bus->dev, "Invalid type %d\n", type);
	}

	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_release);

	/**
	* snd_hdac_ext_stream_spbcap_enable - enable SPIB for a stream
	* @ebus: HD-audio ext core bus
	* @enable: flag to enable/disable SPIB
	* @index: stream index for which SPIB need to be enabled
	*/
	void snd_hdac_ext_stream_spbcap_enable(struct hdac_ext_bus *ebus,
	bool enable, int index)
	{
	u32 mask = 0;
	u32 register_mask = 0;
	struct hdac_bus *bus = &ebus->bus;

	if (!ebus->spbcap) {
	dev_err(bus->dev, "Address of SPB capability is NULL");
	return;
	}

	mask \|= (1 << index);

	register_mask = snd_hdac_chip_readl(bus, SPB_SPBFCCTL);

	mask \|= register_mask;

	if (enable)
	snd_hdac_updatel(ebus->spbcap, AZX_REG_SPB_SPBFCCTL, 0, mask);
	else
	snd_hdac_updatel(ebus->spbcap, AZX_REG_SPB_SPBFCCTL, mask, 0);
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_spbcap_enable);

	/**
	* snd_hdac_ext_stop_streams - stop all stream if running
	* @ebus: HD-audio ext core bus
	*/
	void snd_hdac_ext_stop_streams(struct hdac_ext_bus *ebus)
	{
	struct hdac_bus *bus = ebus_to_hbus(ebus);
	struct hdac_stream *stream;

	if (bus->chip_init) {
	list_for_each_entry(stream, &bus->stream_list, list)
	snd_hdac_stream_stop(stream);
	snd_hdac_bus_stop_chip(bus);
	}
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_stop_streams);