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linux-7.2.3/sound/hda/core/ext/Makefile

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+snd-hda-ext-core-y := bus.o controller.o stream.o
+
+obj-$(CONFIG_SND_HDA_EXT_CORE) += snd-hda-ext-core.o

linux-7.2.3/sound/hda/core/ext/bus.c

@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  hdac-ext-bus.c - HD-audio extended core bus functions.
+ *
+ *  Copyright (C) 2014-2015 Intel Corp
+ *  Author: Jeeja KP <jeeja.kp@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <sound/hdaudio_ext.h>
+
+MODULE_DESCRIPTION("HDA extended core");
+MODULE_LICENSE("GPL v2");
+
+/**
+ * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
+ * @bus: the pointer to HDAC bus object
+ * @dev: device pointer
+ * @ops: bus verb operators
+ * @ext_ops: operators used for ASoC HDA codec drivers
+ *
+ * Returns 0 if successful, or a negative error code.
+ */
+int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
+			const struct hdac_bus_ops *ops,
+			const struct hdac_ext_bus_ops *ext_ops)
+{
+	int ret;
+
+	ret = snd_hdac_bus_init(bus, dev, ops);
+	if (ret < 0)
+		return ret;
+
+	bus->ext_ops = ext_ops;
+	/* FIXME:
+	 * Currently only one bus is supported, if there is device with more
+	 * buses, bus->idx should be greater than 0, but there needs to be a
+	 * reliable way to always assign same number.
+	 */
+	bus->idx = 0;
+	bus->cmd_dma_state = true;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
+
+/**
+ * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
+ * @bus: the pointer to HDAC bus object
+ */
+void snd_hdac_ext_bus_exit(struct hdac_bus *bus)
+{
+	snd_hdac_bus_exit(bus);
+	WARN_ON(!list_empty(&bus->hlink_list));
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
+
+/**
+ * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
+ *
+ * @bus: the pointer to HDAC bus object
+ */
+void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus)
+{
+	struct hdac_device *codec, *__codec;
+	/*
+	 * we need to remove all the codec devices objects created in the
+	 * snd_hdac_ext_bus_device_init
+	 */
+	list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) {
+		snd_hdac_device_unregister(codec);
+		put_device(&codec->dev);
+	}
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
+#define dev_to_hdac(dev) (container_of((dev), \
+			struct hdac_device, dev))
+
+static inline struct hdac_driver *get_hdrv(struct device *dev)
+{
+	struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
+	return hdrv;
+}
+
+static inline struct hdac_device *get_hdev(struct device *dev)
+{
+	struct hdac_device *hdev = dev_to_hdac_dev(dev);
+	return hdev;
+}
+
+static int hda_ext_drv_probe(struct device *dev)
+{
+	return (get_hdrv(dev))->probe(get_hdev(dev));
+}
+
+static int hdac_ext_drv_remove(struct device *dev)
+{
+	return (get_hdrv(dev))->remove(get_hdev(dev));
+}
+
+static void hdac_ext_drv_shutdown(struct device *dev)
+{
+	return (get_hdrv(dev))->shutdown(get_hdev(dev));
+}
+
+/**
+ * snd_hda_ext_driver_register - register a driver for ext hda devices
+ *
+ * @drv: ext hda driver structure
+ */
+int snd_hda_ext_driver_register(struct hdac_driver *drv)
+{
+	drv->type = HDA_DEV_ASOC;
+	drv->driver.bus = &snd_hda_bus_type;
+	/* we use default match */
+
+	if (drv->probe)
+		drv->driver.probe = hda_ext_drv_probe;
+	if (drv->remove)
+		drv->driver.remove = hdac_ext_drv_remove;
+	if (drv->shutdown)
+		drv->driver.shutdown = hdac_ext_drv_shutdown;
+
+	return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
+
+/**
+ * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
+ *
+ * @drv: ext hda driver structure
+ */
+void snd_hda_ext_driver_unregister(struct hdac_driver *drv)
+{
+	driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);

linux-7.2.3/sound/hda/core/ext/controller.c

@@ -0,0 +1,410 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  hdac-ext-controller.c - HD-audio extended controller functions.
+ *
+ *  Copyright (C) 2014-2015 Intel Corp
+ *  Author: Jeeja KP <jeeja.kp@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <sound/hda_register.h>
+#include <sound/hdaudio_ext.h>
+
+/*
+ * 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
+ * @bus: the pointer to HDAC bus object
+ * @enable: flag to turn on/off the capability
+ */
+void snd_hdac_ext_bus_ppcap_enable(struct hdac_bus *bus, bool enable)
+{
+
+	if (!bus->ppcap) {
+		dev_err(bus->dev, "Address of PP capability is NULL");
+		return;
+	}
+
+	if (enable)
+		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
+				 AZX_PPCTL_GPROCEN, AZX_PPCTL_GPROCEN);
+	else
+		snd_hdac_updatel(bus->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
+ * @bus: the pointer to HDAC bus object
+ * @enable: flag to enable/disable interrupt
+ */
+void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_bus *bus, bool enable)
+{
+
+	if (!bus->ppcap) {
+		dev_err(bus->dev, "Address of PP capability is NULL\n");
+		return;
+	}
+
+	if (enable)
+		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
+				 AZX_PPCTL_PIE, AZX_PPCTL_PIE);
+	else
+		snd_hdac_updatel(bus->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
+ * @bus: the pointer to HDAC bus object
+ *
+ * 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_bus *bus)
+{
+	int idx;
+	u32 link_count;
+	struct hdac_ext_link *hlink;
+	u32 leptr;
+
+	link_count = readl(bus->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_obj(*hlink);
+		if (!hlink)
+			return -ENOMEM;
+		hlink->index = idx;
+		hlink->bus = bus;
+		hlink->ml_addr = bus->mlcap + AZX_ML_BASE +
+					(AZX_ML_INTERVAL * idx);
+		hlink->lcaps  = readl(hlink->ml_addr + AZX_REG_ML_LCAP);
+		hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID);
+		hlink->slcount = FIELD_GET(AZX_ML_HDA_LCAP_SLCOUNT, hlink->lcaps) + 1;
+
+		if (hdac_ext_link_alt(hlink)) {
+			leptr = readl(hlink->ml_addr + AZX_REG_ML_LEPTR);
+			hlink->id = FIELD_GET(AZX_REG_ML_LEPTR_ID, leptr);
+		}
+
+		/* since link in On, update the ref */
+		hlink->ref_count = 1;
+
+		list_add_tail(&hlink->list, &bus->hlink_list);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
+
+/**
+ * snd_hdac_ext_link_free_all- free hdac extended link objects
+ *
+ * @bus: the pointer to HDAC bus object
+ */
+
+void snd_hdac_ext_link_free_all(struct hdac_bus *bus)
+{
+	struct hdac_ext_link *hlink;
+
+	while (!list_empty(&bus->hlink_list)) {
+		hlink = list_first_entry(&bus->hlink_list, struct hdac_ext_link, list);
+		list_del(&hlink->list);
+		kfree(hlink);
+	}
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_link_free_all);
+
+struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_id(struct hdac_bus *bus, u32 id)
+{
+	struct hdac_ext_link *hlink;
+
+	list_for_each_entry(hlink, &bus->hlink_list, list)
+		if (hdac_ext_link_alt(hlink) && hlink->id == id)
+			return hlink;
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_hlink_by_id);
+
+/**
+ * snd_hdac_ext_bus_get_hlink_by_addr - get hlink at specified address
+ * @bus: hlink's parent bus device
+ * @addr: codec device address
+ *
+ * Returns hlink object or NULL if matching hlink is not found.
+ */
+struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_addr(struct hdac_bus *bus, int addr)
+{
+	struct hdac_ext_link *hlink;
+
+	list_for_each_entry(hlink, &bus->hlink_list, list)
+		if (hlink->lsdiid & (0x1 << addr))
+			return hlink;
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_hlink_by_addr);
+
+/**
+ * snd_hdac_ext_bus_get_hlink_by_name - get hlink based on codec name
+ * @bus: the pointer to HDAC bus object
+ * @codec_name: codec name
+ */
+struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_name(struct hdac_bus *bus,
+							 const char *codec_name)
+{
+	int bus_idx, addr;
+
+	if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2)
+		return NULL;
+	if (bus->idx != bus_idx)
+		return NULL;
+	if (addr < 0 || addr > 31)
+		return NULL;
+
+	return snd_hdac_ext_bus_get_hlink_by_addr(bus, addr);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_hlink_by_name);
+
+static int check_hdac_link_power_active(struct hdac_ext_link *hlink, bool enable)
+{
+	int timeout;
+	u32 val;
+	int mask = (1 << AZX_ML_LCTL_CPA_SHIFT);
+
+	udelay(3);
+	timeout = 150;
+
+	do {
+		val = readl(hlink->ml_addr + AZX_REG_ML_LCTL);
+		if (enable) {
+			if (((val & mask) >> AZX_ML_LCTL_CPA_SHIFT))
+				return 0;
+		} else {
+			if (!((val & mask) >> AZX_ML_LCTL_CPA_SHIFT))
+				return 0;
+		}
+		udelay(3);
+	} while (--timeout);
+
+	return -EIO;
+}
+
+/**
+ * snd_hdac_ext_bus_link_power_up -power up hda link
+ * @hlink: HD-audio extended link
+ */
+int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *hlink)
+{
+	snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL,
+			 AZX_ML_LCTL_SPA, AZX_ML_LCTL_SPA);
+
+	return check_hdac_link_power_active(hlink, true);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up);
+
+/**
+ * snd_hdac_ext_bus_link_power_down -power down hda link
+ * @hlink: HD-audio extended link
+ */
+int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *hlink)
+{
+	snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, AZX_ML_LCTL_SPA, 0);
+
+	return check_hdac_link_power_active(hlink, false);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);
+
+/**
+ * snd_hdac_ext_bus_link_power_up_all -power up all hda link
+ * @bus: the pointer to HDAC bus object
+ */
+int snd_hdac_ext_bus_link_power_up_all(struct hdac_bus *bus)
+{
+	struct hdac_ext_link *hlink = NULL;
+	int ret;
+
+	list_for_each_entry(hlink, &bus->hlink_list, list) {
+		ret = snd_hdac_ext_bus_link_power_up(hlink);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all);
+
+/**
+ * snd_hdac_ext_bus_link_power_down_all -power down all hda link
+ * @bus: the pointer to HDAC bus object
+ */
+int snd_hdac_ext_bus_link_power_down_all(struct hdac_bus *bus)
+{
+	struct hdac_ext_link *hlink = NULL;
+	int ret;
+
+	list_for_each_entry(hlink, &bus->hlink_list, list) {
+		ret = snd_hdac_ext_bus_link_power_down(hlink);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all);
+
+/**
+ * snd_hdac_ext_bus_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_bus_link_set_stream_id(struct hdac_ext_link *link,
+					 int stream)
+{
+	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, (1 << stream), 1 << stream);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_set_stream_id);
+
+/**
+ * snd_hdac_ext_bus_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_bus_link_clear_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_bus_link_clear_stream_id);
+
+int snd_hdac_ext_bus_link_get(struct hdac_bus *bus,
+				struct hdac_ext_link *hlink)
+{
+	unsigned long codec_mask;
+	int ret = 0;
+
+	guard(mutex)(&bus->lock);
+
+	/*
+	 * if we move from 0 to 1, count will be 1 so power up this link
+	 * as well, also check the dma status and trigger that
+	 */
+	if (++hlink->ref_count == 1) {
+		if (!bus->cmd_dma_state) {
+			snd_hdac_bus_init_cmd_io(bus);
+			bus->cmd_dma_state = true;
+		}
+
+		ret = snd_hdac_ext_bus_link_power_up(hlink);
+
+		/*
+		 * clear the register to invalidate all the output streams
+		 */
+		snd_hdac_updatew(hlink->ml_addr, AZX_REG_ML_LOSIDV,
+				 AZX_ML_LOSIDV_STREAM_MASK, 0);
+		/*
+		 *  wait for 521usec for codec to report status
+		 *  HDA spec section 4.3 - Codec Discovery
+		 */
+		udelay(521);
+		codec_mask = snd_hdac_chip_readw(bus, STATESTS);
+		dev_dbg(bus->dev, "codec_mask = 0x%lx\n", codec_mask);
+		snd_hdac_chip_writew(bus, STATESTS, codec_mask);
+		if (!bus->codec_mask)
+			bus->codec_mask = codec_mask;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);
+
+int snd_hdac_ext_bus_link_put(struct hdac_bus *bus,
+			      struct hdac_ext_link *hlink)
+{
+	int ret = 0;
+	struct hdac_ext_link *hlink_tmp;
+	bool link_up = false;
+
+	guard(mutex)(&bus->lock);
+
+	/*
+	 * if we move from 1 to 0, count will be 0
+	 * so power down this link as well
+	 */
+	if (--hlink->ref_count == 0) {
+		ret = snd_hdac_ext_bus_link_power_down(hlink);
+
+		/*
+		 * now check if all links are off, if so turn off
+		 * cmd dma as well
+		 */
+		list_for_each_entry(hlink_tmp, &bus->hlink_list, list) {
+			if (hlink_tmp->ref_count) {
+				link_up = true;
+				break;
+			}
+		}
+
+		if (!link_up) {
+			snd_hdac_bus_stop_cmd_io(bus);
+			bus->cmd_dma_state = false;
+		}
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);
+
+static void hdac_ext_codec_link_up(struct hdac_device *codec)
+{
+	const char *devname = dev_name(&codec->dev);
+	struct hdac_ext_link *hlink =
+		snd_hdac_ext_bus_get_hlink_by_name(codec->bus, devname);
+
+	if (hlink)
+		snd_hdac_ext_bus_link_get(codec->bus, hlink);
+}
+
+static void hdac_ext_codec_link_down(struct hdac_device *codec)
+{
+	const char *devname = dev_name(&codec->dev);
+	struct hdac_ext_link *hlink =
+		snd_hdac_ext_bus_get_hlink_by_name(codec->bus, devname);
+
+	if (hlink)
+		snd_hdac_ext_bus_link_put(codec->bus, hlink);
+}
+
+void snd_hdac_ext_bus_link_power(struct hdac_device *codec, bool enable)
+{
+	struct hdac_bus *bus = codec->bus;
+	bool oldstate = test_bit(codec->addr, &bus->codec_powered);
+
+	if (enable == oldstate)
+		return;
+
+	snd_hdac_bus_link_power(codec, enable);
+
+	if (enable)
+		hdac_ext_codec_link_up(codec);
+	else
+		hdac_ext_codec_link_down(codec);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power);

linux-7.2.3/sound/hda/core/ext/stream.c

@@ -0,0 +1,448 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  hdac-ext-stream.c - HD-audio extended stream operations.
+ *
+ *  Copyright (C) 2015 Intel Corp
+ *  Author: Jeeja KP <jeeja.kp@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/slab.h>
+#include <sound/pcm.h>
+#include <sound/hda_register.h>
+#include <sound/hdaudio_ext.h>
+#include <sound/compress_driver.h>
+
+/**
+ * snd_hdac_ext_host_stream_setup - Setup a HOST stream.
+ * @hext_stream: HDAudio stream to set up.
+ * @code_loading: Whether the stream is for PCM or code-loading.
+ *
+ * Return: Zero on success or negative error code.
+ */
+int snd_hdac_ext_host_stream_setup(struct hdac_ext_stream *hext_stream, bool code_loading)
+{
+	return hext_stream->host_setup(hdac_stream(hext_stream), code_loading);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_host_stream_setup);
+
+/**
+ * snd_hdac_apl_host_stream_setup - Setup a HOST stream following procedure
+ *                                  recommended for ApolloLake devices.
+ * @hstream: HDAudio stream to set up.
+ * @code_loading: Whether the stream is for PCM or code-loading.
+ *
+ * Return: Zero on success or negative error code.
+ */
+static int snd_hdac_apl_host_stream_setup(struct hdac_stream *hstream, bool code_loading)
+{
+	struct hdac_ext_stream *hext_stream = stream_to_hdac_ext_stream(hstream);
+	int ret;
+
+	snd_hdac_ext_stream_decouple(hstream->bus, hext_stream, false);
+	ret = snd_hdac_stream_setup(hstream, code_loading);
+	snd_hdac_ext_stream_decouple(hstream->bus, hext_stream, true);
+
+	return ret;
+}
+
+/**
+ * snd_hdac_ext_stream_init - initialize each stream (aka device)
+ * @bus: HD-audio core bus
+ * @hext_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
+ */
+static void snd_hdac_ext_stream_init(struct hdac_bus *bus,
+				     struct hdac_ext_stream *hext_stream,
+				     int idx, int direction, int tag)
+{
+	if (bus->ppcap) {
+		hext_stream->pphc_addr = bus->ppcap + AZX_PPHC_BASE +
+				AZX_PPHC_INTERVAL * idx;
+
+		hext_stream->pplc_addr = bus->ppcap + AZX_PPLC_BASE +
+				AZX_PPLC_MULTI * bus->num_streams +
+				AZX_PPLC_INTERVAL * idx;
+	}
+
+	hext_stream->decoupled = false;
+	snd_hdac_stream_init(bus, &hext_stream->hstream, idx, direction, tag);
+}
+
+/**
+ * snd_hdac_ext_stream_init_all - create and initialize the stream objects
+ *   for an extended hda bus
+ * @bus: HD-audio 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_bus *bus, int start_idx,
+				 int num_stream, int dir)
+{
+	struct pci_dev *pci = to_pci_dev(bus->dev);
+	int (*setup_op)(struct hdac_stream *, bool);
+	int stream_tag = 0;
+	int i, tag, idx = start_idx;
+
+	if (pci->device == PCI_DEVICE_ID_INTEL_HDA_APL)
+		setup_op = snd_hdac_apl_host_stream_setup;
+	else
+		setup_op = snd_hdac_stream_setup;
+
+	for (i = 0; i < num_stream; i++) {
+		struct hdac_ext_stream *hext_stream = kzalloc_obj(*hext_stream);
+		if (!hext_stream)
+			return -ENOMEM;
+		tag = ++stream_tag;
+		snd_hdac_ext_stream_init(bus, hext_stream, idx, dir, tag);
+		idx++;
+		hext_stream->host_setup = setup_op;
+	}
+
+	return 0;
+
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init_all);
+
+/**
+ * snd_hdac_ext_stream_free_all - free hdac extended stream objects
+ *
+ * @bus: HD-audio core bus
+ */
+void snd_hdac_ext_stream_free_all(struct hdac_bus *bus)
+{
+	struct hdac_stream *s, *_s;
+	struct hdac_ext_stream *hext_stream;
+
+	list_for_each_entry_safe(s, _s, &bus->stream_list, list) {
+		hext_stream = stream_to_hdac_ext_stream(s);
+		snd_hdac_ext_stream_decouple(bus, hext_stream, false);
+		list_del(&s->list);
+		kfree(hext_stream);
+	}
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_free_all);
+
+void snd_hdac_ext_stream_decouple_locked(struct hdac_bus *bus,
+					 struct hdac_ext_stream *hext_stream,
+					 bool decouple)
+{
+	struct hdac_stream *hstream = &hext_stream->hstream;
+	u32 val;
+	int mask = AZX_PPCTL_PROCEN(hstream->index);
+
+	val = readw(bus->ppcap + AZX_REG_PP_PPCTL) & mask;
+
+	if (decouple && !val)
+		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, mask, mask);
+	else if (!decouple && val)
+		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, mask, 0);
+
+	hext_stream->decoupled = decouple;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple_locked);
+
+/**
+ * snd_hdac_ext_stream_decouple - decouple the hdac stream
+ * @bus: HD-audio core bus
+ * @hext_stream: HD-audio ext core stream object to initialize
+ * @decouple: flag to decouple
+ */
+void snd_hdac_ext_stream_decouple(struct hdac_bus *bus,
+				  struct hdac_ext_stream *hext_stream, bool decouple)
+{
+	guard(spinlock_irq)(&bus->reg_lock);
+	snd_hdac_ext_stream_decouple_locked(bus, hext_stream, decouple);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple);
+
+/**
+ * snd_hdac_ext_stream_start - start a stream
+ * @hext_stream: HD-audio ext core stream to start
+ */
+void snd_hdac_ext_stream_start(struct hdac_ext_stream *hext_stream)
+{
+	snd_hdac_updatel(hext_stream->pplc_addr, AZX_REG_PPLCCTL,
+			 AZX_PPLCCTL_RUN, AZX_PPLCCTL_RUN);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_start);
+
+/**
+ * snd_hdac_ext_stream_clear - stop a stream DMA
+ * @hext_stream: HD-audio ext core stream to stop
+ */
+void snd_hdac_ext_stream_clear(struct hdac_ext_stream *hext_stream)
+{
+	snd_hdac_updatel(hext_stream->pplc_addr, AZX_REG_PPLCCTL, AZX_PPLCCTL_RUN, 0);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_clear);
+
+/**
+ * snd_hdac_ext_stream_reset - reset a stream
+ * @hext_stream: HD-audio ext core stream to reset
+ */
+void snd_hdac_ext_stream_reset(struct hdac_ext_stream *hext_stream)
+{
+	unsigned char val;
+	int timeout;
+
+	snd_hdac_ext_stream_clear(hext_stream);
+
+	snd_hdac_updatel(hext_stream->pplc_addr, AZX_REG_PPLCCTL,
+			 AZX_PPLCCTL_STRST, AZX_PPLCCTL_STRST);
+	udelay(3);
+	timeout = 50;
+	do {
+		val = readl(hext_stream->pplc_addr + AZX_REG_PPLCCTL) &
+				AZX_PPLCCTL_STRST;
+		if (val)
+			break;
+		udelay(3);
+	} while (--timeout);
+	val &= ~AZX_PPLCCTL_STRST;
+	writel(val, hext_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(hext_stream->pplc_addr + AZX_REG_PPLCCTL) & AZX_PPLCCTL_STRST;
+		if (!val)
+			break;
+		udelay(3);
+	} while (--timeout);
+
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_reset);
+
+/**
+ * snd_hdac_ext_stream_setup -  set up the SD for streaming
+ * @hext_stream: HD-audio ext core stream to set up
+ * @fmt: stream format
+ */
+int snd_hdac_ext_stream_setup(struct hdac_ext_stream *hext_stream, int fmt)
+{
+	struct hdac_stream *hstream = &hext_stream->hstream;
+	unsigned int val;
+
+	/* make sure the run bit is zero for SD */
+	snd_hdac_ext_stream_clear(hext_stream);
+	/* program the stream_tag */
+	val = readl(hext_stream->pplc_addr + AZX_REG_PPLCCTL);
+	val = (val & ~AZX_PPLCCTL_STRM_MASK) |
+		(hstream->stream_tag << AZX_PPLCCTL_STRM_SHIFT);
+	writel(val, hext_stream->pplc_addr + AZX_REG_PPLCCTL);
+
+	/* program the stream format */
+	writew(fmt, hext_stream->pplc_addr + AZX_REG_PPLCFMT);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_setup);
+
+static struct hdac_ext_stream *
+hdac_ext_link_dma_stream_assign(struct hdac_bus *bus,
+				struct snd_pcm_substream *substream)
+{
+	struct hdac_ext_stream *res = NULL;
+	struct hdac_stream *hstream = NULL;
+
+	if (!bus->ppcap) {
+		dev_err(bus->dev, "stream type not supported\n");
+		return NULL;
+	}
+
+	guard(spinlock_irq)(&bus->reg_lock);
+	list_for_each_entry(hstream, &bus->stream_list, list) {
+		struct hdac_ext_stream *hext_stream = container_of(hstream,
+								 struct hdac_ext_stream,
+								 hstream);
+		if (hstream->direction != substream->stream)
+			continue;
+
+		/* check if link stream is available */
+		if (!hext_stream->link_locked) {
+			res = hext_stream;
+			break;
+		}
+
+	}
+	if (res) {
+		snd_hdac_ext_stream_decouple_locked(bus, res, true);
+		res->link_locked = 1;
+		res->link_substream = substream;
+	}
+	return res;
+}
+
+static struct hdac_ext_stream *
+hdac_ext_host_dma_stream_assign(struct hdac_bus *bus,
+				struct snd_pcm_substream *substream)
+{
+	struct hdac_ext_stream *res = NULL;
+	struct hdac_stream *hstream = NULL;
+
+	if (!bus->ppcap) {
+		dev_err(bus->dev, "stream type not supported\n");
+		return NULL;
+	}
+
+	guard(spinlock_irq)(&bus->reg_lock);
+	list_for_each_entry(hstream, &bus->stream_list, list) {
+		struct hdac_ext_stream *hext_stream = container_of(hstream,
+								 struct hdac_ext_stream,
+								 hstream);
+		if (hstream->direction != substream->stream)
+			continue;
+
+		if (!hstream->opened) {
+			res = hext_stream;
+			break;
+		}
+	}
+	if (res) {
+		snd_hdac_ext_stream_decouple_locked(bus, res, true);
+		res->hstream.opened = 1;
+		res->hstream.running = 0;
+		res->hstream.substream = substream;
+	}
+
+	return res;
+}
+
+/**
+ * snd_hdac_ext_stream_assign - assign a stream for the PCM
+ * @bus: HD-audio 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_bus *bus,
+					   struct snd_pcm_substream *substream,
+					   int type)
+{
+	struct hdac_ext_stream *hext_stream = NULL;
+	struct hdac_stream *hstream = NULL;
+
+	switch (type) {
+	case HDAC_EXT_STREAM_TYPE_COUPLED:
+		hstream = snd_hdac_stream_assign(bus, substream);
+		if (hstream)
+			hext_stream = container_of(hstream,
+						   struct hdac_ext_stream,
+						   hstream);
+		return hext_stream;
+
+	case HDAC_EXT_STREAM_TYPE_HOST:
+		return hdac_ext_host_dma_stream_assign(bus, substream);
+
+	case HDAC_EXT_STREAM_TYPE_LINK:
+		return hdac_ext_link_dma_stream_assign(bus, substream);
+
+	default:
+		return NULL;
+	}
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_assign);
+
+/**
+ * snd_hdac_ext_stream_release - release the assigned stream
+ * @hext_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 *hext_stream, int type)
+{
+	struct hdac_bus *bus = hext_stream->hstream.bus;
+
+	switch (type) {
+	case HDAC_EXT_STREAM_TYPE_COUPLED:
+		snd_hdac_stream_release(&hext_stream->hstream);
+		break;
+
+	case HDAC_EXT_STREAM_TYPE_HOST:
+		scoped_guard(spinlock_irq, &bus->reg_lock) {
+			/* couple link only if not in use */
+			if (!hext_stream->link_locked)
+				snd_hdac_ext_stream_decouple_locked(bus, hext_stream, false);
+			snd_hdac_stream_release_locked(&hext_stream->hstream);
+		}
+		break;
+
+	case HDAC_EXT_STREAM_TYPE_LINK:
+		scoped_guard(spinlock_irq, &bus->reg_lock) {
+			/* couple host only if not in use */
+			if (!hext_stream->hstream.opened)
+				snd_hdac_ext_stream_decouple_locked(bus, hext_stream, false);
+			hext_stream->link_locked = 0;
+			hext_stream->link_substream = NULL;
+		}
+		break;
+
+	default:
+		dev_dbg(bus->dev, "Invalid type %d\n", type);
+	}
+
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_release);
+
+/**
+ * snd_hdac_ext_cstream_assign - assign a host stream for compress
+ * @bus: HD-audio core bus
+ * @cstream: Compress stream to assign
+ *
+ * Assign an unused host stream for the given compress stream.
+ * If no stream is free, NULL is returned. Stream is decoupled
+ * before assignment.
+ */
+struct hdac_ext_stream *snd_hdac_ext_cstream_assign(struct hdac_bus *bus,
+						    struct snd_compr_stream *cstream)
+{
+	struct hdac_ext_stream *res = NULL;
+	struct hdac_stream *hstream;
+
+	guard(spinlock_irq)(&bus->reg_lock);
+	list_for_each_entry(hstream, &bus->stream_list, list) {
+		struct hdac_ext_stream *hext_stream = stream_to_hdac_ext_stream(hstream);
+
+		if (hstream->direction != cstream->direction)
+			continue;
+
+		if (!hstream->opened) {
+			res = hext_stream;
+			break;
+		}
+	}
+
+	if (res) {
+		snd_hdac_ext_stream_decouple_locked(bus, res, true);
+		res->hstream.opened = 1;
+		res->hstream.running = 0;
+		res->hstream.cstream = cstream;
+	}
+
+	return res;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_cstream_assign);