sound/hda/ext/hdac_ext_controller.c - arm/linux - Git at Google

 /*
  *  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

 /*
  * 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 (!bus->ppcap) {
 		dev_err(bus->dev, "Address of PP capability is NULL");
 		return;
 	}

 	if (enable)
 		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, 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
  * @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 (!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, 0, 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
  * @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(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(sizeof(*hlink), GFP_KERNEL);
 		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);

 		/* since link in On, update the ref */
 		hlink->ref_count = 1;

 		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_SHIFT);

 	udelay(3);
 	timeout = 150;

 	do {
 		val = readl(link->ml_addr + AZX_REG_ML_LCTL);
 		if (enable) {
 			if (((val & mask) >> AZX_MLCTL_CPA_SHIFT))
 				return 0;
 		} else {
 			if (!((val & mask) >> AZX_MLCTL_CPA_SHIFT))
 				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_updatel(link->ml_addr, AZX_REG_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_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);

 	return check_hdac_link_power_active(link, false);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);

 /**
  * snd_hdac_ext_bus_link_power_up_all -power up all hda link
  * @ebus: HD-audio extended bus
  */
 int snd_hdac_ext_bus_link_power_up_all(struct hdac_ext_bus *ebus)
 {
 	struct hdac_ext_link *hlink = NULL;
 	int ret;

 	list_for_each_entry(hlink, &ebus->hlink_list, list) {
 		snd_hdac_updatel(hlink->ml_addr,
 				AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA);
 		ret = check_hdac_link_power_active(hlink, true);
 		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
  * @ebus: HD-audio extended bus
  */
 int snd_hdac_ext_bus_link_power_down_all(struct hdac_ext_bus *ebus)
 {
 	struct hdac_ext_link *hlink = NULL;
 	int ret;

 	list_for_each_entry(hlink, &ebus->hlink_list, list) {
 		snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);
 		ret = check_hdac_link_power_active(hlink, false);
 		if (ret < 0)
 			return ret;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all);

 int snd_hdac_ext_bus_link_get(struct hdac_ext_bus *ebus,
 				struct hdac_ext_link *link)
 {
 	int ret = 0;

 	mutex_lock(&ebus->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 (++link->ref_count == 1) {
 		if (!ebus->cmd_dma_state) {
 			snd_hdac_bus_init_cmd_io(&ebus->bus);
 			ebus->cmd_dma_state = true;
 		}

 		ret = snd_hdac_ext_bus_link_power_up(link);
 	}

 	mutex_unlock(&ebus->lock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);

 int snd_hdac_ext_bus_link_put(struct hdac_ext_bus *ebus,
 				struct hdac_ext_link *link)
 {
 	int ret = 0;
 	struct hdac_ext_link *hlink;
 	bool link_up = false;

 	mutex_lock(&ebus->lock);

 	/*
 	 * if we move from 1 to 0, count will be 0
 	 * so power down this link as well
 	 */
 	if (--link->ref_count == 0) {
 		ret = snd_hdac_ext_bus_link_power_down(link);

 		/*
 		 * now check if all links are off, if so turn off
 		 * cmd dma as well
 		 */
 		list_for_each_entry(hlink, &ebus->hlink_list, list) {
 			if (hlink->ref_count) {
 				link_up = true;
 				break;
 			}
 		}

 		if (!link_up) {
 			snd_hdac_bus_stop_cmd_io(&ebus->bus);
 			ebus->cmd_dma_state = false;
 		}
 	}

 	mutex_unlock(&ebus->lock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);
	/*
	* 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

	/*
	* 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 (!bus->ppcap) {
	dev_err(bus->dev, "Address of PP capability is NULL");
	return;
	}

	if (enable)
	snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, 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
	* @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 (!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, 0, 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
	* @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(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(sizeof(*hlink), GFP_KERNEL);
	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);

	/* since link in On, update the ref */
	hlink->ref_count = 1;

	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_SHIFT);

	udelay(3);
	timeout = 150;

	do {
	val = readl(link->ml_addr + AZX_REG_ML_LCTL);
	if (enable) {
	if (((val & mask) >> AZX_MLCTL_CPA_SHIFT))
	return 0;
	} else {
	if (!((val & mask) >> AZX_MLCTL_CPA_SHIFT))
	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_updatel(link->ml_addr, AZX_REG_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_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);

	return check_hdac_link_power_active(link, false);
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);

	/**
	* snd_hdac_ext_bus_link_power_up_all -power up all hda link
	* @ebus: HD-audio extended bus
	*/
	int snd_hdac_ext_bus_link_power_up_all(struct hdac_ext_bus *ebus)
	{
	struct hdac_ext_link *hlink = NULL;
	int ret;

	list_for_each_entry(hlink, &ebus->hlink_list, list) {
	snd_hdac_updatel(hlink->ml_addr,
	AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA);
	ret = check_hdac_link_power_active(hlink, true);
	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
	* @ebus: HD-audio extended bus
	*/
	int snd_hdac_ext_bus_link_power_down_all(struct hdac_ext_bus *ebus)
	{
	struct hdac_ext_link *hlink = NULL;
	int ret;

	list_for_each_entry(hlink, &ebus->hlink_list, list) {
	snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);
	ret = check_hdac_link_power_active(hlink, false);
	if (ret < 0)
	return ret;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all);

	int snd_hdac_ext_bus_link_get(struct hdac_ext_bus *ebus,
	struct hdac_ext_link *link)
	{
	int ret = 0;

	mutex_lock(&ebus->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 (++link->ref_count == 1) {
	if (!ebus->cmd_dma_state) {
	snd_hdac_bus_init_cmd_io(&ebus->bus);
	ebus->cmd_dma_state = true;
	}

	ret = snd_hdac_ext_bus_link_power_up(link);
	}

	mutex_unlock(&ebus->lock);
	return ret;
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);

	int snd_hdac_ext_bus_link_put(struct hdac_ext_bus *ebus,
	struct hdac_ext_link *link)
	{
	int ret = 0;
	struct hdac_ext_link *hlink;
	bool link_up = false;

	mutex_lock(&ebus->lock);

	/*
	* if we move from 1 to 0, count will be 0
	* so power down this link as well
	*/
	if (--link->ref_count == 0) {
	ret = snd_hdac_ext_bus_link_power_down(link);

	/*
	* now check if all links are off, if so turn off
	* cmd dma as well
	*/
	list_for_each_entry(hlink, &ebus->hlink_list, list) {
	if (hlink->ref_count) {
	link_up = true;
	break;
	}
	}

	if (!link_up) {
	snd_hdac_bus_stop_cmd_io(&ebus->bus);
	ebus->cmd_dma_state = false;
	}
	}

	mutex_unlock(&ebus->lock);
	return ret;
	}
	EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);