[mirror_ubuntu-artful-kernel.git] / sound / hda / ext / hdac_ext_stream.c

/*
 *  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;
	}

	if (ebus->spbcap) {
		stream->spib_addr = ebus->spbcap + AZX_SPB_BASE +
					AZX_SPB_INTERVAL * idx +
					AZX_SPB_SPIB;

		stream->fifo_addr = ebus->spbcap + AZX_SPB_BASE +
					AZX_SPB_INTERVAL * idx +
					AZX_SPB_MAXFIFO;
	}

	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 = readl(ebus->spbcap + AZX_REG_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_stream_set_spib - sets the spib value of a stream
 * @ebus: HD-audio ext core bus
 * @stream: hdac_ext_stream
 * @value: spib value to set
 */
int snd_hdac_ext_stream_set_spib(struct hdac_ext_bus *ebus,
				 struct hdac_ext_stream *stream, u32 value)
{
	struct hdac_bus *bus = &ebus->bus;

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

	writel(value, stream->spib_addr);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_set_spib);

/**
 * snd_hdac_ext_stream_set_spbmaxfifo - sets the spib value of a stream
 * @ebus: HD-audio ext core bus
 * @stream: hdac_ext_stream
 *
 * Return maxfifo for the stream
 */
int snd_hdac_ext_stream_set_spbmaxfifo(struct hdac_ext_bus *ebus,
				 struct hdac_ext_stream *stream)
{
	struct hdac_bus *bus = &ebus->bus;

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

	return readl(stream->fifo_addr);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_set_spbmaxfifo);


/**
 * 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);
Commit	Line	Data
df203a4e JK	1	/*
	2	* hdac-ext-stream.c - HD-audio extended stream operations.
	3	*
	4	* Copyright (C) 2015 Intel Corp
	5	* Author: Jeeja KP <jeeja.kp@intel.com>
	6	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; version 2 of the License.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	18	*/
	19
	20	#include <linux/delay.h>
e7a3484d	21	#include <linux/slab.h>
df203a4e JK	22	#include <sound/pcm.h>
	23	#include <sound/hda_register.h>
	24	#include <sound/hdaudio_ext.h>
	25
	26	/**
	27	* snd_hdac_ext_stream_init - initialize each stream (aka device)
	28	* @ebus: HD-audio ext core bus
	29	* @stream: HD-audio ext core stream object to initialize
	30	* @idx: stream index number
	31	* @direction: stream direction (SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE)
	32	* @tag: the tag id to assign
	33	*
	34	* initialize the stream, if ppcap is enabled then init those and then
	35	* invoke hdac stream initialization routine
	36	*/
	37	void snd_hdac_ext_stream_init(struct hdac_ext_bus *ebus,
	38	struct hdac_ext_stream *stream,
	39	int idx, int direction, int tag)
	40	{
	41	struct hdac_bus *bus = &ebus->bus;
	42
	43	if (ebus->ppcap) {
	44	stream->pphc_addr = ebus->ppcap + AZX_PPHC_BASE +
	45	AZX_PPHC_INTERVAL * idx;
	46
	47	stream->pplc_addr = ebus->ppcap + AZX_PPLC_BASE +
	48	AZX_PPLC_MULTI * ebus->num_streams +
	49	AZX_PPLC_INTERVAL * idx;
	50	}
	51
ee8bc4df JK	52	if (ebus->spbcap) {
	53	stream->spib_addr = ebus->spbcap + AZX_SPB_BASE +
	54	AZX_SPB_INTERVAL * idx +
	55	AZX_SPB_SPIB;
	56
	57	stream->fifo_addr = ebus->spbcap + AZX_SPB_BASE +
	58	AZX_SPB_INTERVAL * idx +
	59	AZX_SPB_MAXFIFO;
	60	}
	61
df203a4e JK	62	stream->decoupled = false;
	63	snd_hdac_stream_init(bus, &stream->hstream, idx, direction, tag);
	64	}
	65	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init);
	66
e7a3484d VK	67	/**
	68	* snd_hdac_ext_stream_init_all - create and initialize the stream objects
	69	* for an extended hda bus
	70	* @ebus: HD-audio ext core bus
	71	* @start_idx: start index for streams
	72	* @num_stream: number of streams to initialize
	73	* @dir: direction of streams
	74	*/
	75	int snd_hdac_ext_stream_init_all(struct hdac_ext_bus *ebus, int start_idx,
	76	int num_stream, int dir)
	77	{
	78	int stream_tag = 0;
	79	int i, tag, idx = start_idx;
	80
	81	for (i = 0; i < num_stream; i++) {
	82	struct hdac_ext_stream *stream =
	83	kzalloc(sizeof(*stream), GFP_KERNEL);
	84	if (!stream)
	85	return -ENOMEM;
	86	tag = ++stream_tag;
	87	snd_hdac_ext_stream_init(ebus, stream, idx, dir, tag);
	88	idx++;
	89	}
	90
	91	return 0;
	92
	93	}
	94	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init_all);
	95
	96	/**
	97	* snd_hdac_stream_free_all - free hdac extended stream objects
	98	*
	99	* @ebus: HD-audio ext core bus
	100	*/
	101	void snd_hdac_stream_free_all(struct hdac_ext_bus *ebus)
	102	{
	103	struct hdac_stream *s;
	104	struct hdac_ext_stream *stream;
	105	struct hdac_bus *bus = ebus_to_hbus(ebus);
	106
	107	while (!list_empty(&bus->stream_list)) {
	108	s = list_first_entry(&bus->stream_list, struct hdac_stream, list);
	109	stream = stream_to_hdac_ext_stream(s);
	110	list_del(&s->list);
	111	kfree(stream);
	112	}
	113	}
	114	EXPORT_SYMBOL_GPL(snd_hdac_stream_free_all);
	115
df203a4e JK	116	/**
	117	* snd_hdac_ext_stream_decouple - decouple the hdac stream
	118	* @ebus: HD-audio ext core bus
	119	* @stream: HD-audio ext core stream object to initialize
	120	* @decouple: flag to decouple
	121	*/
	122	void snd_hdac_ext_stream_decouple(struct hdac_ext_bus *ebus,
	123	struct hdac_ext_stream *stream, bool decouple)
	124	{
	125	struct hdac_stream *hstream = &stream->hstream;
	126	struct hdac_bus *bus = &ebus->bus;
	127
	128	spin_lock_irq(&bus->reg_lock);
	129	if (decouple)
	130	snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0,
	131	AZX_PPCTL_PROCEN(hstream->index));
	132	else
	133	snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL,
	134	AZX_PPCTL_PROCEN(hstream->index), 0);
	135	stream->decoupled = decouple;
	136	spin_unlock_irq(&bus->reg_lock);
	137	}
	138	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple);
	139
	140	/**
	141	* snd_hdac_ext_linkstream_start - start a stream
	142	* @stream: HD-audio ext core stream to start
	143	*/
	144	void snd_hdac_ext_link_stream_start(struct hdac_ext_stream *stream)
	145	{
	146	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, 0, AZX_PPLCCTL_RUN);
	147	}
	148	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_start);
	149
	150	/**
	151	* snd_hdac_ext_link_stream_clear - stop a stream DMA
	152	* @stream: HD-audio ext core stream to stop
	153	*/
	154	void snd_hdac_ext_link_stream_clear(struct hdac_ext_stream *stream)
	155	{
	156	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, AZX_PPLCCTL_RUN, 0);
	157	}
	158	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_clear);
	159
	160	/**
	161	* snd_hdac_ext_link_stream_reset - reset a stream
	162	* @stream: HD-audio ext core stream to reset
	163	*/
	164	void snd_hdac_ext_link_stream_reset(struct hdac_ext_stream *stream)
	165	{
	166	unsigned char val;
	167	int timeout;
	168
	169	snd_hdac_ext_link_stream_clear(stream);
	170
	171	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, 0, AZX_PPLCCTL_STRST);
	172	udelay(3);
	173	timeout = 50;
	174	do {
	175	val = readl(stream->pplc_addr + AZX_REG_PPLCCTL) &
	176	AZX_PPLCCTL_STRST;
	177	if (val)
	178	break;
	179	udelay(3);
180	} while (--timeout);
181	val &= ~AZX_PPLCCTL_STRST;
182	writel(val, stream->pplc_addr + AZX_REG_PPLCCTL);
183	udelay(3);
184
185	timeout = 50;
186	/* waiting for hardware to report that the stream is out of reset */
187	do {
188	val = readl(stream->pplc_addr + AZX_REG_PPLCCTL) & AZX_PPLCCTL_STRST;
189	if (!val)
190	break;
191	udelay(3);
192	} while (--timeout);
193
194	}
195	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_reset);
196
197	/**
198	* snd_hdac_ext_link_stream_setup - set up the SD for streaming
199	* @stream: HD-audio ext core stream to set up
200	* @fmt: stream format
201	*/
202	int snd_hdac_ext_link_stream_setup(struct hdac_ext_stream *stream, int fmt)
203	{
204	struct hdac_stream *hstream = &stream->hstream;
205	unsigned int val;
206
207	/* make sure the run bit is zero for SD */
208	snd_hdac_ext_link_stream_clear(stream);
209	/* program the stream_tag */
210	val = readl(stream->pplc_addr + AZX_REG_PPLCCTL);
211	val = (val & ~AZX_PPLCCTL_STRM_MASK) \|
212	(hstream->stream_tag << AZX_PPLCCTL_STRM_SHIFT);
213	writel(val, stream->pplc_addr + AZX_REG_PPLCCTL);
214
215	/* program the stream format */
216	writew(fmt, stream->pplc_addr + AZX_REG_PPLCFMT);
217
218	return 0;
219	}
220	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_setup);
221
222	/**
223	* snd_hdac_ext_link_set_stream_id - maps stream id to link output
224	* @link: HD-audio ext link to set up
225	* @stream: stream id
226	*/
227	void snd_hdac_ext_link_set_stream_id(struct hdac_ext_link *link,
228	int stream)
229	{
230	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, (1 << stream), 0);
231	}
232	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_set_stream_id);
233
234	/**
235	* snd_hdac_ext_link_clear_stream_id - maps stream id to link output
236	* @link: HD-audio ext link to set up
237	* @stream: stream id
238	*/
239	void snd_hdac_ext_link_clear_stream_id(struct hdac_ext_link *link,
240	int stream)
241	{
242	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, 0, (1 << stream));
243	}
244	EXPORT_SYMBOL_GPL(snd_hdac_ext_link_clear_stream_id);
245
246	static struct hdac_ext_stream *
247	hdac_ext_link_stream_assign(struct hdac_ext_bus *ebus,
248	struct snd_pcm_substream *substream)
249	{
250	struct hdac_ext_stream *res = NULL;
251	struct hdac_stream *stream = NULL;
252	struct hdac_bus *hbus = &ebus->bus;
253
254	if (!ebus->ppcap) {
255	dev_err(hbus->dev, "stream type not supported\n");
256	return NULL;
257	}
258
259	list_for_each_entry(stream, &hbus->stream_list, list) {
260	struct hdac_ext_stream *hstream = container_of(stream,
261	struct hdac_ext_stream,
262	hstream);
263	if (stream->direction != substream->stream)
264	continue;
265
266	/* check if decoupled stream and not in use is available */
267	if (hstream->decoupled && !hstream->link_locked) {
268	res = hstream;
269	break;
270	}
271
272	if (!hstream->link_locked) {
273	snd_hdac_ext_stream_decouple(ebus, hstream, true);
274	res = hstream;
275	break;
276	}
277	}
278	if (res) {
279	spin_lock_irq(&hbus->reg_lock);
280	res->link_locked = 1;
281	res->link_substream = substream;
282	spin_unlock_irq(&hbus->reg_lock);
283	}
284	return res;
285	}
286
287	static struct hdac_ext_stream *
288	hdac_ext_host_stream_assign(struct hdac_ext_bus *ebus,
289	struct snd_pcm_substream *substream)
290	{
291	struct hdac_ext_stream *res = NULL;
292	struct hdac_stream *stream = NULL;
293	struct hdac_bus *hbus = &ebus->bus;
294	int key;
295
296	if (!ebus->ppcap) {
297	dev_err(hbus->dev, "stream type not supported\n");
298	return NULL;
299	}
300
301	/* make a non-zero unique key for the substream */
302	key = (substream->pcm->device << 16) \| (substream->number << 2) \|
303	(substream->stream + 1);
304
305	list_for_each_entry(stream, &hbus->stream_list, list) {
306	struct hdac_ext_stream *hstream = container_of(stream,
307	struct hdac_ext_stream,
308	hstream);
309	if (stream->direction != substream->stream)
310	continue;
311
9b06dc93	312	if (!stream->opened) {
df203a4e JK	313	if (!hstream->decoupled)
	314	snd_hdac_ext_stream_decouple(ebus, hstream, true);
	315	res = hstream;
	316	break;
	317	}
	318	}
	319	if (res) {
	320	spin_lock_irq(&hbus->reg_lock);
	321	res->hstream.opened = 1;
	322	res->hstream.running = 0;
	323	res->hstream.assigned_key = key;
	324	res->hstream.substream = substream;
	325	spin_unlock_irq(&hbus->reg_lock);
	326	}
	327
	328	return res;
	329	}
	330
	331	/**
	332	* snd_hdac_ext_stream_assign - assign a stream for the PCM
	333	* @ebus: HD-audio ext core bus
	334	* @substream: PCM substream to assign
	335	* @type: type of stream (coupled, host or link stream)
	336	*
	337	* This assigns the stream based on the type (coupled/host/link), for the
	338	* given PCM substream, assigns it and returns the stream object
	339	*
	340	* coupled: Looks for an unused stream
	341	* host: Looks for an unused decoupled host stream
	342	* link: Looks for an unused decoupled link stream
	343	*
	344	* If no stream is free, returns NULL. The function tries to keep using
	345	* the same stream object when it's used beforehand. when a stream is
	346	* decoupled, it becomes a host stream and link stream.
	347	*/
	348	struct hdac_ext_stream snd_hdac_ext_stream_assign(struct hdac_ext_bus ebus,
	349	struct snd_pcm_substream *substream,
	350	int type)
	351	{
	352	struct hdac_ext_stream *hstream = NULL;
	353	struct hdac_stream *stream = NULL;
	354	struct hdac_bus *hbus = &ebus->bus;
	355
	356	switch (type) {
	357	case HDAC_EXT_STREAM_TYPE_COUPLED:
	358	stream = snd_hdac_stream_assign(hbus, substream);
	359	if (stream)
	360	hstream = container_of(stream,
	361	struct hdac_ext_stream, hstream);
	362	return hstream;
	363
	364	case HDAC_EXT_STREAM_TYPE_HOST:
	365	return hdac_ext_host_stream_assign(ebus, substream);
	366
	367	case HDAC_EXT_STREAM_TYPE_LINK:
	368	return hdac_ext_link_stream_assign(ebus, substream);
	369
	370	default:
	371	return NULL;
	372	}
	373	}
	374	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_assign);
	375
	376	/**
377	* snd_hdac_ext_stream_release - release the assigned stream
378	* @stream: HD-audio ext core stream to release
379	* @type: type of stream (coupled, host or link stream)
380	*
381	* Release the stream that has been assigned by snd_hdac_ext_stream_assign().
382	*/
383	void snd_hdac_ext_stream_release(struct hdac_ext_stream *stream, int type)
384	{
385	struct hdac_bus *bus = stream->hstream.bus;
386	struct hdac_ext_bus *ebus = hbus_to_ebus(bus);
387
388	switch (type) {
389	case HDAC_EXT_STREAM_TYPE_COUPLED:
390	snd_hdac_stream_release(&stream->hstream);
391	break;
392
393	case HDAC_EXT_STREAM_TYPE_HOST:
394	if (stream->decoupled) {
395	snd_hdac_ext_stream_decouple(ebus, stream, false);
396	snd_hdac_stream_release(&stream->hstream);
397	}
398	break;
399
400	case HDAC_EXT_STREAM_TYPE_LINK:
401	if (stream->decoupled)
402	snd_hdac_ext_stream_decouple(ebus, stream, false);
403	spin_lock_irq(&bus->reg_lock);
404	stream->link_locked = 0;
405	stream->link_substream = NULL;
406	spin_unlock_irq(&bus->reg_lock);
407	break;
408
409	default:
410	dev_dbg(bus->dev, "Invalid type %d\n", type);
411	}
412
413	}
414	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_release);
415
416	/**
417	* snd_hdac_ext_stream_spbcap_enable - enable SPIB for a stream
418	* @ebus: HD-audio ext core bus
419	* @enable: flag to enable/disable SPIB
420	* @index: stream index for which SPIB need to be enabled
421	*/
422	void snd_hdac_ext_stream_spbcap_enable(struct hdac_ext_bus *ebus,
423	bool enable, int index)
424	{
425	u32 mask = 0;
426	u32 register_mask = 0;
427	struct hdac_bus *bus = &ebus->bus;
428
429	if (!ebus->spbcap) {
430	dev_err(bus->dev, "Address of SPB capability is NULL");
431	return;
432	}
433
434	mask \|= (1 << index);
435
a7e3dd85	436	register_mask = readl(ebus->spbcap + AZX_REG_SPB_SPBFCCTL);
df203a4e JK	437
	438	mask \|= register_mask;
	439
	440	if (enable)
	441	snd_hdac_updatel(ebus->spbcap, AZX_REG_SPB_SPBFCCTL, 0, mask);
	442	else
	443	snd_hdac_updatel(ebus->spbcap, AZX_REG_SPB_SPBFCCTL, mask, 0);
	444	}
	445	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_spbcap_enable);
	446
ee8bc4df JK	447	/**
	448	* snd_hdac_ext_stream_set_spib - sets the spib value of a stream
	449	* @ebus: HD-audio ext core bus
	450	* @stream: hdac_ext_stream
	451	* @value: spib value to set
	452	*/
	453	int snd_hdac_ext_stream_set_spib(struct hdac_ext_bus *ebus,
	454	struct hdac_ext_stream *stream, u32 value)
	455	{
	456	struct hdac_bus *bus = &ebus->bus;
	457
	458	if (!ebus->spbcap) {
	459	dev_err(bus->dev, "Address of SPB capability is NULL");
	460	return -EINVAL;
	461	}
	462
	463	writel(value, stream->spib_addr);
	464
	465	return 0;
	466	}
	467	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_set_spib);
	468
	469	/**
	470	* snd_hdac_ext_stream_set_spbmaxfifo - sets the spib value of a stream
	471	* @ebus: HD-audio ext core bus
	472	* @stream: hdac_ext_stream
	473	*
	474	* Return maxfifo for the stream
	475	*/
	476	int snd_hdac_ext_stream_set_spbmaxfifo(struct hdac_ext_bus *ebus,
	477	struct hdac_ext_stream *stream)
	478	{
	479	struct hdac_bus *bus = &ebus->bus;
	480
	481	if (!ebus->spbcap) {
	482	dev_err(bus->dev, "Address of SPB capability is NULL");
	483	return -EINVAL;
	484	}
	485
	486	return readl(stream->fifo_addr);
	487	}
	488	EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_set_spbmaxfifo);
	489
	490
df203a4e JK	491	/**
	492	* snd_hdac_ext_stop_streams - stop all stream if running
	493	* @ebus: HD-audio ext core bus
	494	*/
	495	void snd_hdac_ext_stop_streams(struct hdac_ext_bus *ebus)
	496	{
	497	struct hdac_bus *bus = ebus_to_hbus(ebus);
	498	struct hdac_stream *stream;
	499
	500	if (bus->chip_init) {
	501	list_for_each_entry(stream, &bus->stream_list, list)
	502	snd_hdac_stream_stop(stream);
	503	snd_hdac_bus_stop_chip(bus);
	504	}
	505	}
	506	EXPORT_SYMBOL_GPL(snd_hdac_ext_stop_streams);