Linux-libre 4.2-gnu

4 files changed, 911 insertions, 0 deletions

diff --git a/sound/hda/ext/Makefile b/sound/hda/ext/Makefile
new file mode 100644
index 000000000..9b6f641c7
--- /dev/null
+++ b/sound/hda/ext/Makefile
@@ -0,0 +1,3 @@
+snd-hda-ext-core-objs := hdac_ext_bus.o hdac_ext_controller.o hdac_ext_stream.o
+
+obj-$(CONFIG_SND_HDA_EXT_CORE) += snd-hda-ext-core.o
diff --git a/sound/hda/ext/hdac_ext_bus.c b/sound/hda/ext/hdac_ext_bus.c
new file mode 100644
index 000000000..0aa5d9eb6
--- /dev/null
+++ b/sound/hda/ext/hdac_ext_bus.c
@@ -0,0 +1,174 @@
+/*
+ *  hdac-ext-bus.c - HD-audio extended core bus functions.
+ *
+ *  Copyright (C) 2014-2015 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/module.h>
+#include <linux/slab.h>
+#include <sound/hdaudio_ext.h>
+
+MODULE_DESCRIPTION("HDA extended core");
+MODULE_LICENSE("GPL v2");
+
+static void hdac_ext_writel(u32 value, u32 __iomem *addr)
+{
+	writel(value, addr);
+}
+
+static u32 hdac_ext_readl(u32 __iomem *addr)
+{
+	return readl(addr);
+}
+
+static void hdac_ext_writew(u16 value, u16 __iomem *addr)
+{
+	writew(value, addr);
+}
+
+static u16 hdac_ext_readw(u16 __iomem *addr)
+{
+	return readw(addr);
+}
+
+static void hdac_ext_writeb(u8 value, u8 __iomem *addr)
+{
+	writeb(value, addr);
+}
+
+static u8 hdac_ext_readb(u8 __iomem *addr)
+{
+	return readb(addr);
+}
+
+static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type,
+			   size_t size, struct snd_dma_buffer *buf)
+{
+	return snd_dma_alloc_pages(type, bus->dev, size, buf);
+}
+
+static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
+{
+	snd_dma_free_pages(buf);
+}
+
+static const struct hdac_io_ops hdac_ext_default_io = {
+	.reg_writel = hdac_ext_writel,
+	.reg_readl = hdac_ext_readl,
+	.reg_writew = hdac_ext_writew,
+	.reg_readw = hdac_ext_readw,
+	.reg_writeb = hdac_ext_writeb,
+	.reg_readb = hdac_ext_readb,
+	.dma_alloc_pages = hdac_ext_dma_alloc_pages,
+	.dma_free_pages = hdac_ext_dma_free_pages,
+};
+
+/**
+ * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
+ * @ebus: the pointer to extended bus object
+ * @dev: device pointer
+ * @ops: bus verb operators
+ * @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use
+ * default ops
+ *
+ * Returns 0 if successful, or a negative error code.
+ */
+int snd_hdac_ext_bus_init(struct hdac_ext_bus *ebus, struct device *dev,
+			const struct hdac_bus_ops *ops,
+			const struct hdac_io_ops *io_ops)
+{
+	int ret;
+	static int idx;
+
+	/* check if io ops are provided, if not load the defaults */
+	if (io_ops == NULL)
+		io_ops = &hdac_ext_default_io;
+
+	ret = snd_hdac_bus_init(&ebus->bus, dev, ops, io_ops);
+	if (ret < 0)
+		return ret;
+
+	INIT_LIST_HEAD(&ebus->hlink_list);
+	ebus->idx = idx++;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
+
+/**
+ * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
+ * @ebus: the pointer to extended bus object
+ */
+void snd_hdac_ext_bus_exit(struct hdac_ext_bus *ebus)
+{
+	snd_hdac_bus_exit(&ebus->bus);
+	WARN_ON(!list_empty(&ebus->hlink_list));
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
+
+static void default_release(struct device *dev)
+{
+	snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev));
+}
+
+/**
+ * snd_hdac_ext_device_init - initialize the HDA extended codec base device
+ * @ebus: hdac extended bus to attach to
+ * @addr: codec address
+ *
+ * Returns zero for success or a negative error code.
+ */
+int snd_hdac_ext_bus_device_init(struct hdac_ext_bus *ebus, int addr)
+{
+	struct hdac_device *hdev = NULL;
+	struct hdac_bus *bus = ebus_to_hbus(ebus);
+	char name[15];
+	int ret;
+
+	hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
+	if (!hdev)
+		return -ENOMEM;
+
+	snprintf(name, sizeof(name), "ehdaudio%dD%d", ebus->idx, addr);
+
+	ret  = snd_hdac_device_init(hdev, bus, name, addr);
+	if (ret < 0) {
+		dev_err(bus->dev, "device init failed for hdac device\n");
+		return ret;
+	}
+	hdev->type = HDA_DEV_ASOC;
+	hdev->dev.release = default_release;
+
+	ret = snd_hdac_device_register(hdev);
+	if (ret) {
+		dev_err(bus->dev, "failed to register hdac device\n");
+		snd_hdac_ext_bus_device_exit(hdev);
+		return ret;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);
+
+/**
+ * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
+ * @hdev: hdac device to clean up
+ */
+void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
+{
+	snd_hdac_device_exit(hdev);
+	kfree(hdev);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);
diff --git a/sound/hda/ext/hdac_ext_controller.c b/sound/hda/ext/hdac_ext_controller.c
new file mode 100644
index 000000000..358f16195
--- /dev/null
+++ b/sound/hda/ext/hdac_ext_controller.c
@@ -0,0 +1,282 @@
+/*
+ *  hdac-ext-controller.c - HD-audio extended controller functions.
+ *
+ *  Copyright (C) 2014-2015 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/hda_register.h>
+#include <sound/hdaudio_ext.h>
+
+/*
+ * maximum HDAC capablities we should parse to avoid endless looping:
+ * currently we have 4 extended caps, so this is future proof for now.
+ * extend when this limit is seen meeting in real HW
+ */
+#define HDAC_MAX_CAPS 10
+
+/**
+ * snd_hdac_ext_bus_parse_capabilities - parse capablity structure
+ * @ebus: the pointer to extended bus object
+ *
+ * Returns 0 if successful, or a negative error code.
+ */
+int snd_hdac_ext_bus_parse_capabilities(struct hdac_ext_bus *ebus)
+{
+	unsigned int cur_cap;
+	unsigned int offset;
+	struct hdac_bus *bus = &ebus->bus;
+	unsigned int counter = 0;
+
+	offset = snd_hdac_chip_readl(bus, LLCH);
+
+	/* Lets walk the linked capabilities list */
+	do {
+		cur_cap = _snd_hdac_chip_read(l, bus, offset);
+
+		dev_dbg(bus->dev, "Capability version: 0x%x\n",
+				((cur_cap & AZX_CAP_HDR_VER_MASK) >> AZX_CAP_HDR_VER_OFF));
+
+		dev_dbg(bus->dev, "HDA capability ID: 0x%x\n",
+				(cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF);
+
+		switch ((cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF) {
+		case AZX_ML_CAP_ID:
+			dev_dbg(bus->dev, "Found ML capability\n");
+			ebus->mlcap = bus->remap_addr + offset;
+			break;
+
+		case AZX_GTS_CAP_ID:
+			dev_dbg(bus->dev, "Found GTS capability offset=%x\n", offset);
+			ebus->gtscap = bus->remap_addr + offset;
+			break;
+
+		case AZX_PP_CAP_ID:
+			/* PP capability found, the Audio DSP is present */
+			dev_dbg(bus->dev, "Found PP capability offset=%x\n", offset);
+			ebus->ppcap = bus->remap_addr + offset;
+			break;
+
+		case AZX_SPB_CAP_ID:
+			/* SPIB capability found, handler function */
+			dev_dbg(bus->dev, "Found SPB capability\n");
+			ebus->spbcap = bus->remap_addr + offset;
+			break;
+
+		default:
+			dev_dbg(bus->dev, "Unknown capability %d\n", cur_cap);
+			break;
+		}
+
+		counter++;
+
+		if (counter > HDAC_MAX_CAPS) {
+			dev_err(bus->dev, "We exceeded HDAC Ext capablities!!!\n");
+			break;
+		}
+
+		/* read the offset of next capabiity */
+		offset = cur_cap & AZX_CAP_HDR_NXT_PTR_MASK;
+
+	} while (offset);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_parse_capabilities);
+
+/*
+ * processing pipe helpers - these helpers are useful for dealing with HDA
+ * new capability of processing pipelines
+ */
+
+/**
+ * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability
+ * @ebus: HD-audio extended core bus
+ * @enable: flag to turn on/off the capability
+ */
+void snd_hdac_ext_bus_ppcap_enable(struct hdac_ext_bus *ebus, bool enable)
+{
+	struct hdac_bus *bus = &ebus->bus;
+
+	if (!ebus->ppcap) {
+		dev_err(bus->dev, "Address of PP capability is NULL");
+		return;
+	}
+
+	if (enable)
+		snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_GPROCEN);
+	else
+		snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_GPROCEN, 0);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable);
+
+/**
+ * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable
+ * @ebus: HD-audio extended core bus
+ * @enable: flag to enable/disable interrupt
+ */
+void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_ext_bus *ebus, bool enable)
+{
+	struct hdac_bus *bus = &ebus->bus;
+
+	if (!ebus->ppcap) {
+		dev_err(bus->dev, "Address of PP capability is NULL\n");
+		return;
+	}
+
+	if (enable)
+		snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_PIE);
+	else
+		snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_PIE, 0);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable);
+
+/*
+ * Multilink helpers - these helpers are useful for dealing with HDA
+ * new multilink capability
+ */
+
+/**
+ * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability
+ * @ebus: HD-audio extended core bus
+ *
+ * This will parse all links and read the mlink capabilities and add them
+ * in hlink_list of extended hdac bus
+ * Note: this will be freed on bus exit by driver
+ */
+int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_ext_bus *ebus)
+{
+	int idx;
+	u32 link_count;
+	struct hdac_ext_link *hlink;
+	struct hdac_bus *bus = &ebus->bus;
+
+	link_count = readl(ebus->mlcap + AZX_REG_ML_MLCD) + 1;
+
+	dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count);
+
+	for (idx = 0; idx < link_count; idx++) {
+		hlink  = kzalloc(sizeof(*hlink), GFP_KERNEL);
+		if (!hlink)
+			return -ENOMEM;
+		hlink->index = idx;
+		hlink->bus = bus;
+		hlink->ml_addr = ebus->mlcap + AZX_ML_BASE +
+					(AZX_ML_INTERVAL * idx);
+		hlink->lcaps  = snd_hdac_chip_readl(bus, ML_LCAP);
+		hlink->lsdiid = snd_hdac_chip_readw(bus, ML_LSDIID);
+
+		list_add_tail(&hlink->list, &ebus->hlink_list);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
+
+/**
+ * snd_hdac_link_free_all- free hdac extended link objects
+ *
+ * @ebus: HD-audio ext core bus
+ */
+
+void snd_hdac_link_free_all(struct hdac_ext_bus *ebus)
+{
+	struct hdac_ext_link *l;
+
+	while (!list_empty(&ebus->hlink_list)) {
+		l = list_first_entry(&ebus->hlink_list, struct hdac_ext_link, list);
+		list_del(&l->list);
+		kfree(l);
+	}
+}
+EXPORT_SYMBOL_GPL(snd_hdac_link_free_all);
+
+/**
+ * snd_hdac_ext_bus_get_link_index - get link based on codec name
+ * @ebus: HD-audio extended core bus
+ * @codec_name: codec name
+ */
+struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_ext_bus *ebus,
+						 const char *codec_name)
+{
+	int i;
+	struct hdac_ext_link *hlink = NULL;
+	int bus_idx, addr;
+
+	if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2)
+		return NULL;
+	if (ebus->idx != bus_idx)
+		return NULL;
+
+	list_for_each_entry(hlink, &ebus->hlink_list, list) {
+		for (i = 0; i < HDA_MAX_CODECS; i++) {
+			if (hlink->lsdiid & (0x1 << addr))
+				return hlink;
+		}
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link);
+
+static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable)
+{
+	int timeout;
+	u32 val;
+	int mask = (1 << AZX_MLCTL_CPA);
+
+	udelay(3);
+	timeout = 50;
+
+	do {
+		val = snd_hdac_chip_readl(link->bus, ML_LCTL);
+		if (enable) {
+			if (((val & mask) >> AZX_MLCTL_CPA))
+				return 0;
+		} else {
+			if (!((val & mask) >> AZX_MLCTL_CPA))
+				return 0;
+		}
+		udelay(3);
+	} while (--timeout);
+
+	return -EIO;
+}
+
+/**
+ * snd_hdac_ext_bus_link_power_up -power up hda link
+ * @link: HD-audio extended link
+ */
+int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link)
+{
+	snd_hdac_chip_updatel(link->bus, ML_LCTL, 0, AZX_MLCTL_SPA);
+
+	return check_hdac_link_power_active(link, true);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up);
+
+/**
+ * snd_hdac_ext_bus_link_power_down -power down hda link
+ * @link: HD-audio extended link
+ */
+int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link)
+{
+	snd_hdac_chip_updatel(link->bus, ML_LCTL, AZX_MLCTL_SPA, 0);
+
+	return check_hdac_link_power_active(link, false);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);
diff --git a/sound/hda/ext/hdac_ext_stream.c b/sound/hda/ext/hdac_ext_stream.c
new file mode 100644
index 000000000..3de47dd1a
--- /dev/null
+++ b/sound/hda/ext/hdac_ext_stream.c
@@ -0,0 +1,452 @@
+/*
+ *  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);