drivers/soc/xilinx/zynqmp_pm_domains.c - linux/kernel/git/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * ZynqMP Generic PM domain support
  *
  *  Copyright (C) 2015-2019 Xilinx, Inc.
  *
  *  Davorin Mista <davorin.mista@aggios.com>
  *  Jolly Shah <jollys@xilinx.com>
  *  Rajan Vaja <rajan.vaja@xilinx.com>
  */

 #include <linux/err.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/slab.h>

 #include <linux/firmware/xlnx-zynqmp.h>

 #define ZYNQMP_NUM_DOMAINS		(100)

 static int min_capability;

 /**
  * struct zynqmp_pm_domain - Wrapper around struct generic_pm_domain
  * @gpd:		Generic power domain
  * @node_id:		PM node ID corresponding to device inside PM domain
  * @requested:		The PM node mapped to the PM domain has been requested
  */
 struct zynqmp_pm_domain {
 	struct generic_pm_domain gpd;
 	u32 node_id;
 	bool requested;
 };

 #define to_zynqmp_pm_domain(pm_domain) \
 	container_of(pm_domain, struct zynqmp_pm_domain, gpd)

 /**
  * zynqmp_gpd_is_active_wakeup_path() - Check if device is in wakeup source
  *					path
  * @dev:	Device to check for wakeup source path
  * @not_used:	Data member (not required)
  *
  * This function is checks device's child hierarchy and checks if any device is
  * set as wakeup source.
  *
  * Return: 1 if device is in wakeup source path else 0
  */
 static int zynqmp_gpd_is_active_wakeup_path(struct device *dev, void *not_used)
 {
 	int may_wakeup;

 	may_wakeup = device_may_wakeup(dev);
 	if (may_wakeup)
 		return may_wakeup;

 	return device_for_each_child(dev, NULL,
 			zynqmp_gpd_is_active_wakeup_path);
 }

 /**
  * zynqmp_gpd_power_on() - Power on PM domain
  * @domain:	Generic PM domain
  *
  * This function is called before devices inside a PM domain are resumed, to
  * power on PM domain.
  *
  * Return: 0 on success, error code otherwise
  */
 static int zynqmp_gpd_power_on(struct generic_pm_domain *domain)
 {
 	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
 	int ret;

 	ret = zynqmp_pm_set_requirement(pd->node_id,
 					ZYNQMP_PM_CAPABILITY_ACCESS,
 					ZYNQMP_PM_MAX_QOS,
 					ZYNQMP_PM_REQUEST_ACK_BLOCKING);
 	if (ret) {
 		dev_err(&domain->dev,
 			"failed to set requirement to 0x%x for PM node id %d: %d\n",
 			ZYNQMP_PM_CAPABILITY_ACCESS, pd->node_id, ret);
 		return ret;
 	}

 	dev_dbg(&domain->dev, "set requirement to 0x%x for PM node id %d\n",
 		ZYNQMP_PM_CAPABILITY_ACCESS, pd->node_id);

 	return 0;
 }

 /**
  * zynqmp_gpd_power_off() - Power off PM domain
  * @domain:	Generic PM domain
  *
  * This function is called after devices inside a PM domain are suspended, to
  * power off PM domain.
  *
  * Return: 0 on success, error code otherwise
  */
 static int zynqmp_gpd_power_off(struct generic_pm_domain *domain)
 {
 	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
 	int ret;
 	struct pm_domain_data *pdd, *tmp;
 	u32 capabilities = min_capability;
 	bool may_wakeup;

 	/* If domain is already released there is nothing to be done */
 	if (!pd->requested) {
 		dev_dbg(&domain->dev, "PM node id %d is already released\n",
 			pd->node_id);
 		return 0;
 	}

 	list_for_each_entry_safe(pdd, tmp, &domain->dev_list, list_node) {
 		/* If device is in wakeup path, set capability to WAKEUP */
 		may_wakeup = zynqmp_gpd_is_active_wakeup_path(pdd->dev, NULL);
 		if (may_wakeup) {
 			dev_dbg(pdd->dev, "device is in wakeup path in %s\n",
 				domain->name);
 			capabilities = ZYNQMP_PM_CAPABILITY_WAKEUP;
 			break;
 		}
 	}

 	ret = zynqmp_pm_set_requirement(pd->node_id, capabilities, 0,
 					ZYNQMP_PM_REQUEST_ACK_NO);
 	if (ret) {
 		dev_err(&domain->dev,
 			"failed to set requirement to 0x%x for PM node id %d: %d\n",
 			capabilities, pd->node_id, ret);
 		return ret;
 	}

 	dev_dbg(&domain->dev, "set requirement to 0x%x for PM node id %d\n",
 		capabilities, pd->node_id);

 	return 0;
 }

 /**
  * zynqmp_gpd_attach_dev() - Attach device to the PM domain
  * @domain:	Generic PM domain
  * @dev:	Device to attach
  *
  * Return: 0 on success, error code otherwise
  */
 static int zynqmp_gpd_attach_dev(struct generic_pm_domain *domain,
 				 struct device *dev)
 {
 	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
 	struct device_link *link;
 	int ret;

 	link = device_link_add(dev, &domain->dev, DL_FLAG_SYNC_STATE_ONLY);
 	if (!link)
 		dev_dbg(&domain->dev, "failed to create device link for %s\n",
 			dev_name(dev));

 	/* If this is not the first device to attach there is nothing to do */
 	if (domain->device_count)
 		return 0;

 	ret = zynqmp_pm_request_node(pd->node_id, 0, 0,
 				     ZYNQMP_PM_REQUEST_ACK_BLOCKING);
 	if (ret) {
 		dev_err(&domain->dev, "%s request failed for node %d: %d\n",
 			domain->name, pd->node_id, ret);
 		return ret;
 	}

 	pd->requested = true;

 	dev_dbg(&domain->dev, "%s requested PM node id %d\n",
 		dev_name(dev), pd->node_id);

 	return 0;
 }

 /**
  * zynqmp_gpd_detach_dev() - Detach device from the PM domain
  * @domain:	Generic PM domain
  * @dev:	Device to detach
  */
 static void zynqmp_gpd_detach_dev(struct generic_pm_domain *domain,
 				  struct device *dev)
 {
 	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
 	int ret;

 	/* If this is not the last device to detach there is nothing to do */
 	if (domain->device_count)
 		return;

 	ret = zynqmp_pm_release_node(pd->node_id);
 	if (ret) {
 		dev_err(&domain->dev, "failed to release PM node id %d: %d\n",
 			pd->node_id, ret);
 		return;
 	}

 	pd->requested = false;

 	dev_dbg(&domain->dev, "%s released PM node id %d\n",
 		dev_name(dev), pd->node_id);
 }

 static struct generic_pm_domain *zynqmp_gpd_xlate
 				(struct of_phandle_args *genpdspec, void *data)
 {
 	struct genpd_onecell_data *genpd_data = data;
 	unsigned int i, idx = genpdspec->args[0];
 	struct zynqmp_pm_domain *pd;

 	pd = to_zynqmp_pm_domain(genpd_data->domains[0]);

 	if (genpdspec->args_count != 1)
 		return ERR_PTR(-EINVAL);

 	/* Check for existing pm domains */
 	for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++) {
 		if (pd[i].node_id == idx)
 			goto done;
 	}

 	/**
 	 * Add index in empty node_id of power domain list as no existing
 	 * power domain found for current index.
 	 */
 	for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++) {
 		if (pd[i].node_id == 0) {
 			pd[i].node_id = idx;
 			break;
 		}
 	}

 done:
 	if (!genpd_data->domains[i] || i == ZYNQMP_NUM_DOMAINS)
 		return ERR_PTR(-ENOENT);

 	return genpd_data->domains[i];
 }

 static int zynqmp_gpd_probe(struct platform_device *pdev)
 {
 	int i;
 	struct genpd_onecell_data *zynqmp_pd_data;
 	struct generic_pm_domain **domains;
 	struct zynqmp_pm_domain *pd;
 	struct device *dev = &pdev->dev;

 	pd = devm_kcalloc(dev, ZYNQMP_NUM_DOMAINS, sizeof(*pd), GFP_KERNEL);
 	if (!pd)
 		return -ENOMEM;

 	zynqmp_pd_data = devm_kzalloc(dev, sizeof(*zynqmp_pd_data), GFP_KERNEL);
 	if (!zynqmp_pd_data)
 		return -ENOMEM;

 	zynqmp_pd_data->xlate = zynqmp_gpd_xlate;

 	domains = devm_kcalloc(dev, ZYNQMP_NUM_DOMAINS, sizeof(*domains),
 			       GFP_KERNEL);
 	if (!domains)
 		return -ENOMEM;

 	if (!of_device_is_compatible(dev->parent->of_node,
 				     "xlnx,zynqmp-firmware"))
 		min_capability = ZYNQMP_PM_CAPABILITY_UNUSABLE;

 	for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++, pd++) {
 		pd->node_id = 0;
 		pd->gpd.name = kasprintf(GFP_KERNEL, "domain%d", i);
 		pd->gpd.power_off = zynqmp_gpd_power_off;
 		pd->gpd.power_on = zynqmp_gpd_power_on;
 		pd->gpd.attach_dev = zynqmp_gpd_attach_dev;
 		pd->gpd.detach_dev = zynqmp_gpd_detach_dev;

 		domains[i] = &pd->gpd;

 		/* Mark all PM domains as initially powered off */
 		pm_genpd_init(&pd->gpd, NULL, true);
 	}

 	zynqmp_pd_data->domains = domains;
 	zynqmp_pd_data->num_domains = ZYNQMP_NUM_DOMAINS;
 	of_genpd_add_provider_onecell(dev->parent->of_node, zynqmp_pd_data);

 	return 0;
 }

 static int zynqmp_gpd_remove(struct platform_device *pdev)
 {
 	of_genpd_del_provider(pdev->dev.parent->of_node);

 	return 0;
 }

 static void zynqmp_gpd_sync_state(struct device *dev)
 {
 	int ret;

 	ret = zynqmp_pm_init_finalize();
 	if (ret)
 		dev_warn(dev, "failed to release power management to firmware\n");
 }

 static struct platform_driver zynqmp_power_domain_driver = {
 	.driver	= {
 		.name = "zynqmp_power_controller",
 		.sync_state = zynqmp_gpd_sync_state,
 	},
 	.probe = zynqmp_gpd_probe,
 	.remove = zynqmp_gpd_remove,
 };
 module_platform_driver(zynqmp_power_domain_driver);

 MODULE_ALIAS("platform:zynqmp_power_controller");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* ZynqMP Generic PM domain support
	*
	* Copyright (C) 2015-2019 Xilinx, Inc.
	*
	* Davorin Mista <davorin.mista@aggios.com>
	* Jolly Shah <jollys@xilinx.com>
	* Rajan Vaja <rajan.vaja@xilinx.com>
	*/

	#include <linux/err.h>
	#include <linux/list.h>
	#include <linux/module.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>
	#include <linux/pm_domain.h>
	#include <linux/slab.h>

	#include <linux/firmware/xlnx-zynqmp.h>

	#define ZYNQMP_NUM_DOMAINS (100)

	static int min_capability;

	/**
	* struct zynqmp_pm_domain - Wrapper around struct generic_pm_domain
	* @gpd: Generic power domain
	* @node_id: PM node ID corresponding to device inside PM domain
	* @requested: The PM node mapped to the PM domain has been requested
	*/
	struct zynqmp_pm_domain {
	struct generic_pm_domain gpd;
	u32 node_id;
	bool requested;
	};

	#define to_zynqmp_pm_domain(pm_domain) \
	container_of(pm_domain, struct zynqmp_pm_domain, gpd)

	/**
	* zynqmp_gpd_is_active_wakeup_path() - Check if device is in wakeup source
	* path
	* @dev: Device to check for wakeup source path
	* @not_used: Data member (not required)
	*
	* This function is checks device's child hierarchy and checks if any device is
	* set as wakeup source.
	*
	* Return: 1 if device is in wakeup source path else 0
	*/
	static int zynqmp_gpd_is_active_wakeup_path(struct device dev, void not_used)
	{
	int may_wakeup;

	may_wakeup = device_may_wakeup(dev);
	if (may_wakeup)
	return may_wakeup;

	return device_for_each_child(dev, NULL,
	zynqmp_gpd_is_active_wakeup_path);
	}

	/**
	* zynqmp_gpd_power_on() - Power on PM domain
	* @domain: Generic PM domain
	*
	* This function is called before devices inside a PM domain are resumed, to
	* power on PM domain.
	*
	* Return: 0 on success, error code otherwise
	*/
	static int zynqmp_gpd_power_on(struct generic_pm_domain *domain)
	{
	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
	int ret;

	ret = zynqmp_pm_set_requirement(pd->node_id,
	ZYNQMP_PM_CAPABILITY_ACCESS,
	ZYNQMP_PM_MAX_QOS,
	ZYNQMP_PM_REQUEST_ACK_BLOCKING);
	if (ret) {
	dev_err(&domain->dev,
	"failed to set requirement to 0x%x for PM node id %d: %d\n",
	ZYNQMP_PM_CAPABILITY_ACCESS, pd->node_id, ret);
	return ret;
	}

	dev_dbg(&domain->dev, "set requirement to 0x%x for PM node id %d\n",
	ZYNQMP_PM_CAPABILITY_ACCESS, pd->node_id);

	return 0;
	}

	/**
	* zynqmp_gpd_power_off() - Power off PM domain
	* @domain: Generic PM domain
	*
	* This function is called after devices inside a PM domain are suspended, to
	* power off PM domain.
	*
	* Return: 0 on success, error code otherwise
	*/
	static int zynqmp_gpd_power_off(struct generic_pm_domain *domain)
	{
	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
	int ret;
	struct pm_domain_data pdd, tmp;
	u32 capabilities = min_capability;
	bool may_wakeup;

	/* If domain is already released there is nothing to be done */
	if (!pd->requested) {
	dev_dbg(&domain->dev, "PM node id %d is already released\n",
	pd->node_id);
	return 0;
	}

	list_for_each_entry_safe(pdd, tmp, &domain->dev_list, list_node) {
	/* If device is in wakeup path, set capability to WAKEUP */
	may_wakeup = zynqmp_gpd_is_active_wakeup_path(pdd->dev, NULL);
	if (may_wakeup) {
	dev_dbg(pdd->dev, "device is in wakeup path in %s\n",
	domain->name);
	capabilities = ZYNQMP_PM_CAPABILITY_WAKEUP;
	break;
	}
	}

	ret = zynqmp_pm_set_requirement(pd->node_id, capabilities, 0,
	ZYNQMP_PM_REQUEST_ACK_NO);
	if (ret) {
	dev_err(&domain->dev,
	"failed to set requirement to 0x%x for PM node id %d: %d\n",
	capabilities, pd->node_id, ret);
	return ret;
	}

	dev_dbg(&domain->dev, "set requirement to 0x%x for PM node id %d\n",
	capabilities, pd->node_id);

	return 0;
	}

	/**
	* zynqmp_gpd_attach_dev() - Attach device to the PM domain
	* @domain: Generic PM domain
	* @dev: Device to attach
	*
	* Return: 0 on success, error code otherwise
	*/
	static int zynqmp_gpd_attach_dev(struct generic_pm_domain *domain,
	struct device *dev)
	{
	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
	struct device_link *link;
	int ret;

	link = device_link_add(dev, &domain->dev, DL_FLAG_SYNC_STATE_ONLY);
	if (!link)
	dev_dbg(&domain->dev, "failed to create device link for %s\n",
	dev_name(dev));

	/* If this is not the first device to attach there is nothing to do */
	if (domain->device_count)
	return 0;

	ret = zynqmp_pm_request_node(pd->node_id, 0, 0,
	ZYNQMP_PM_REQUEST_ACK_BLOCKING);
	if (ret) {
	dev_err(&domain->dev, "%s request failed for node %d: %d\n",
	domain->name, pd->node_id, ret);
	return ret;
	}

	pd->requested = true;

	dev_dbg(&domain->dev, "%s requested PM node id %d\n",
	dev_name(dev), pd->node_id);

	return 0;
	}

	/**
	* zynqmp_gpd_detach_dev() - Detach device from the PM domain
	* @domain: Generic PM domain
	* @dev: Device to detach
	*/
	static void zynqmp_gpd_detach_dev(struct generic_pm_domain *domain,
	struct device *dev)
	{
	struct zynqmp_pm_domain *pd = to_zynqmp_pm_domain(domain);
	int ret;

	/* If this is not the last device to detach there is nothing to do */
	if (domain->device_count)
	return;

	ret = zynqmp_pm_release_node(pd->node_id);
	if (ret) {
	dev_err(&domain->dev, "failed to release PM node id %d: %d\n",
	pd->node_id, ret);
	return;
	}

	pd->requested = false;

	dev_dbg(&domain->dev, "%s released PM node id %d\n",
	dev_name(dev), pd->node_id);
	}

	static struct generic_pm_domain *zynqmp_gpd_xlate
	(struct of_phandle_args genpdspec, void data)
	{
	struct genpd_onecell_data *genpd_data = data;
	unsigned int i, idx = genpdspec->args[0];
	struct zynqmp_pm_domain *pd;

	pd = to_zynqmp_pm_domain(genpd_data->domains[0]);

	if (genpdspec->args_count != 1)
	return ERR_PTR(-EINVAL);

	/* Check for existing pm domains */
	for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++) {
	if (pd[i].node_id == idx)
	goto done;
	}

	/**
	* Add index in empty node_id of power domain list as no existing
	* power domain found for current index.
	*/
	for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++) {
	if (pd[i].node_id == 0) {
	pd[i].node_id = idx;
	break;
	}
	}

	done:
	if (!genpd_data->domains[i] \|\| i == ZYNQMP_NUM_DOMAINS)
	return ERR_PTR(-ENOENT);

	return genpd_data->domains[i];
	}

	static int zynqmp_gpd_probe(struct platform_device *pdev)
	{
	int i;
	struct genpd_onecell_data *zynqmp_pd_data;
	struct generic_pm_domain **domains;
	struct zynqmp_pm_domain *pd;
	struct device *dev = &pdev->dev;

	pd = devm_kcalloc(dev, ZYNQMP_NUM_DOMAINS, sizeof(*pd), GFP_KERNEL);
	if (!pd)
	return -ENOMEM;

	zynqmp_pd_data = devm_kzalloc(dev, sizeof(*zynqmp_pd_data), GFP_KERNEL);
	if (!zynqmp_pd_data)
	return -ENOMEM;

	zynqmp_pd_data->xlate = zynqmp_gpd_xlate;

	domains = devm_kcalloc(dev, ZYNQMP_NUM_DOMAINS, sizeof(*domains),
	GFP_KERNEL);
	if (!domains)
	return -ENOMEM;

	if (!of_device_is_compatible(dev->parent->of_node,
	"xlnx,zynqmp-firmware"))
	min_capability = ZYNQMP_PM_CAPABILITY_UNUSABLE;

	for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++, pd++) {
	pd->node_id = 0;
	pd->gpd.name = kasprintf(GFP_KERNEL, "domain%d", i);
	pd->gpd.power_off = zynqmp_gpd_power_off;
	pd->gpd.power_on = zynqmp_gpd_power_on;
	pd->gpd.attach_dev = zynqmp_gpd_attach_dev;
	pd->gpd.detach_dev = zynqmp_gpd_detach_dev;

	domains[i] = &pd->gpd;

	/* Mark all PM domains as initially powered off */
	pm_genpd_init(&pd->gpd, NULL, true);
	}

	zynqmp_pd_data->domains = domains;
	zynqmp_pd_data->num_domains = ZYNQMP_NUM_DOMAINS;
	of_genpd_add_provider_onecell(dev->parent->of_node, zynqmp_pd_data);

	return 0;
	}

	static int zynqmp_gpd_remove(struct platform_device *pdev)
	{
	of_genpd_del_provider(pdev->dev.parent->of_node);

	return 0;
	}

	static void zynqmp_gpd_sync_state(struct device *dev)
	{
	int ret;

	ret = zynqmp_pm_init_finalize();
	if (ret)
	dev_warn(dev, "failed to release power management to firmware\n");
	}

	static struct platform_driver zynqmp_power_domain_driver = {
	.driver = {
	.name = "zynqmp_power_controller",
	.sync_state = zynqmp_gpd_sync_state,
	},
	.probe = zynqmp_gpd_probe,
	.remove = zynqmp_gpd_remove,
	};
	module_platform_driver(zynqmp_power_domain_driver);

	MODULE_ALIAS("platform:zynqmp_power_controller");