drivers/soc/tegra/powergate-bpmp.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved
  */

 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/slab.h>

 #include <soc/tegra/bpmp.h>
 #include <soc/tegra/bpmp-abi.h>

 struct tegra_powergate_info {
 	unsigned int id;
 	char *name;
 };

 struct tegra_powergate {
 	struct generic_pm_domain genpd;
 	struct tegra_bpmp *bpmp;
 	unsigned int id;
 };

 static inline struct tegra_powergate *
 to_tegra_powergate(struct generic_pm_domain *genpd)
 {
 	return container_of(genpd, struct tegra_powergate, genpd);
 }

 static int tegra_bpmp_powergate_set_state(struct tegra_bpmp *bpmp,
 					  unsigned int id, u32 state)
 {
 	struct mrq_pg_request request;
 	struct tegra_bpmp_message msg;
 	int err;

 	memset(&request, 0, sizeof(request));
 	request.cmd = CMD_PG_SET_STATE;
 	request.id = id;
 	request.set_state.state = state;

 	memset(&msg, 0, sizeof(msg));
 	msg.mrq = MRQ_PG;
 	msg.tx.data = &request;
 	msg.tx.size = sizeof(request);

 	err = tegra_bpmp_transfer(bpmp, &msg);
 	if (err < 0)
 		return err;
 	else if (msg.rx.ret < 0)
 		return -EINVAL;

 	return 0;
 }

 static int tegra_bpmp_powergate_get_state(struct tegra_bpmp *bpmp,
 					  unsigned int id)
 {
 	struct mrq_pg_response response;
 	struct mrq_pg_request request;
 	struct tegra_bpmp_message msg;
 	int err;

 	memset(&request, 0, sizeof(request));
 	request.cmd = CMD_PG_GET_STATE;
 	request.id = id;

 	memset(&response, 0, sizeof(response));

 	memset(&msg, 0, sizeof(msg));
 	msg.mrq = MRQ_PG;
 	msg.tx.data = &request;
 	msg.tx.size = sizeof(request);
 	msg.rx.data = &response;
 	msg.rx.size = sizeof(response);

 	err = tegra_bpmp_transfer(bpmp, &msg);
 	if (err < 0)
 		return PG_STATE_OFF;
 	else if (msg.rx.ret < 0)
 		return -EINVAL;

 	return response.get_state.state;
 }

 static int tegra_bpmp_powergate_get_max_id(struct tegra_bpmp *bpmp)
 {
 	struct mrq_pg_response response;
 	struct mrq_pg_request request;
 	struct tegra_bpmp_message msg;
 	int err;

 	memset(&request, 0, sizeof(request));
 	request.cmd = CMD_PG_GET_MAX_ID;

 	memset(&response, 0, sizeof(response));

 	memset(&msg, 0, sizeof(msg));
 	msg.mrq = MRQ_PG;
 	msg.tx.data = &request;
 	msg.tx.size = sizeof(request);
 	msg.rx.data = &response;
 	msg.rx.size = sizeof(response);

 	err = tegra_bpmp_transfer(bpmp, &msg);
 	if (err < 0)
 		return err;
 	else if (msg.rx.ret < 0)
 		return -EINVAL;

 	return response.get_max_id.max_id;
 }

 static char *tegra_bpmp_powergate_get_name(struct tegra_bpmp *bpmp,
 					   unsigned int id)
 {
 	struct mrq_pg_response response;
 	struct mrq_pg_request request;
 	struct tegra_bpmp_message msg;
 	int err;

 	memset(&request, 0, sizeof(request));
 	request.cmd = CMD_PG_GET_NAME;
 	request.id = id;

 	memset(&response, 0, sizeof(response));

 	memset(&msg, 0, sizeof(msg));
 	msg.mrq = MRQ_PG;
 	msg.tx.data = &request;
 	msg.tx.size = sizeof(request);
 	msg.rx.data = &response;
 	msg.rx.size = sizeof(response);

 	err = tegra_bpmp_transfer(bpmp, &msg);
 	if (err < 0 || msg.rx.ret < 0)
 		return NULL;

 	return kstrdup(response.get_name.name, GFP_KERNEL);
 }

 static inline bool tegra_bpmp_powergate_is_powered(struct tegra_bpmp *bpmp,
 						   unsigned int id)
 {
 	return tegra_bpmp_powergate_get_state(bpmp, id) != PG_STATE_OFF;
 }

 static int tegra_powergate_power_on(struct generic_pm_domain *domain)
 {
 	struct tegra_powergate *powergate = to_tegra_powergate(domain);
 	struct tegra_bpmp *bpmp = powergate->bpmp;

 	return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
 					      PG_STATE_ON);
 }

 static int tegra_powergate_power_off(struct generic_pm_domain *domain)
 {
 	struct tegra_powergate *powergate = to_tegra_powergate(domain);
 	struct tegra_bpmp *bpmp = powergate->bpmp;

 	return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
 					      PG_STATE_OFF);
 }

 static struct tegra_powergate *
 tegra_powergate_add(struct tegra_bpmp *bpmp,
 		    const struct tegra_powergate_info *info)
 {
 	struct tegra_powergate *powergate;
 	bool off;
 	int err;

 	off = !tegra_bpmp_powergate_is_powered(bpmp, info->id);

 	powergate = devm_kzalloc(bpmp->dev, sizeof(*powergate), GFP_KERNEL);
 	if (!powergate)
 		return ERR_PTR(-ENOMEM);

 	powergate->id = info->id;
 	powergate->bpmp = bpmp;

 	powergate->genpd.name = kstrdup(info->name, GFP_KERNEL);
 	powergate->genpd.power_on = tegra_powergate_power_on;
 	powergate->genpd.power_off = tegra_powergate_power_off;

 	err = pm_genpd_init(&powergate->genpd, NULL, off);
 	if (err < 0) {
 		kfree(powergate->genpd.name);
 		return ERR_PTR(err);
 	}

 	return powergate;
 }

 static void tegra_powergate_remove(struct tegra_powergate *powergate)
 {
 	struct generic_pm_domain *genpd = &powergate->genpd;
 	struct tegra_bpmp *bpmp = powergate->bpmp;
 	int err;

 	err = pm_genpd_remove(genpd);
 	if (err < 0)
 		dev_err(bpmp->dev, "failed to remove power domain %s: %d\n",
 			genpd->name, err);

 	kfree(genpd->name);
 }

 static int
 tegra_bpmp_probe_powergates(struct tegra_bpmp *bpmp,
 			    struct tegra_powergate_info **powergatesp)
 {
 	struct tegra_powergate_info *powergates;
 	unsigned int max_id, id, count = 0;
 	unsigned int num_holes = 0;
 	int err;

 	err = tegra_bpmp_powergate_get_max_id(bpmp);
 	if (err < 0)
 		return err;

 	max_id = err;

 	dev_dbg(bpmp->dev, "maximum powergate ID: %u\n", max_id);

 	powergates = kcalloc(max_id + 1, sizeof(*powergates), GFP_KERNEL);
 	if (!powergates)
 		return -ENOMEM;

 	for (id = 0; id <= max_id; id++) {
 		struct tegra_powergate_info *info = &powergates[count];

 		info->name = tegra_bpmp_powergate_get_name(bpmp, id);
 		if (!info->name || info->name[0] == '\0') {
 			num_holes++;
 			continue;
 		}

 		info->id = id;
 		count++;
 	}

 	dev_dbg(bpmp->dev, "holes: %u\n", num_holes);

 	*powergatesp = powergates;

 	return count;
 }

 static int tegra_bpmp_add_powergates(struct tegra_bpmp *bpmp,
 				     struct tegra_powergate_info *powergates,
 				     unsigned int count)
 {
 	struct genpd_onecell_data *genpd = &bpmp->genpd;
 	struct generic_pm_domain **domains;
 	struct tegra_powergate *powergate;
 	unsigned int i;
 	int err;

 	domains = kcalloc(count, sizeof(*domains), GFP_KERNEL);
 	if (!domains)
 		return -ENOMEM;

 	for (i = 0; i < count; i++) {
 		powergate = tegra_powergate_add(bpmp, &powergates[i]);
 		if (IS_ERR(powergate)) {
 			err = PTR_ERR(powergate);
 			goto remove;
 		}

 		dev_dbg(bpmp->dev, "added power domain %s\n",
 			powergate->genpd.name);
 		domains[i] = &powergate->genpd;
 	}

 	genpd->num_domains = count;
 	genpd->domains = domains;

 	return 0;

 remove:
 	while (i--) {
 		powergate = to_tegra_powergate(domains[i]);
 		tegra_powergate_remove(powergate);
 	}

 	kfree(genpd->domains);
 	return err;
 }

 static void tegra_bpmp_remove_powergates(struct tegra_bpmp *bpmp)
 {
 	struct genpd_onecell_data *genpd = &bpmp->genpd;
 	unsigned int i = genpd->num_domains;
 	struct tegra_powergate *powergate;

 	while (i--) {
 		dev_dbg(bpmp->dev, "removing power domain %s\n",
 			genpd->domains[i]->name);
 		powergate = to_tegra_powergate(genpd->domains[i]);
 		tegra_powergate_remove(powergate);
 	}
 }

 static struct generic_pm_domain *
 tegra_powergate_xlate(struct of_phandle_args *spec, void *data)
 {
 	struct generic_pm_domain *domain = ERR_PTR(-ENOENT);
 	struct genpd_onecell_data *genpd = data;
 	unsigned int i;

 	for (i = 0; i < genpd->num_domains; i++) {
 		struct tegra_powergate *powergate;

 		powergate = to_tegra_powergate(genpd->domains[i]);
 		if (powergate->id == spec->args[0]) {
 			domain = &powergate->genpd;
 			break;
 		}
 	}

 	return domain;
 }

 int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp)
 {
 	struct device_node *np = bpmp->dev->of_node;
 	struct tegra_powergate_info *powergates;
 	struct device *dev = bpmp->dev;
 	unsigned int count, i;
 	int err;

 	err = tegra_bpmp_probe_powergates(bpmp, &powergates);
 	if (err < 0)
 		return err;

 	count = err;

 	dev_dbg(dev, "%u power domains probed\n", count);

 	err = tegra_bpmp_add_powergates(bpmp, powergates, count);
 	if (err < 0)
 		goto free;

 	bpmp->genpd.xlate = tegra_powergate_xlate;

 	err = of_genpd_add_provider_onecell(np, &bpmp->genpd);
 	if (err < 0) {
 		dev_err(dev, "failed to add power domain provider: %d\n", err);
 		tegra_bpmp_remove_powergates(bpmp);
 	}

 free:
 	for (i = 0; i < count; i++)
 		kfree(powergates[i].name);

 	kfree(powergates);
 	return err;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved
	*/

	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/pm_domain.h>
	#include <linux/slab.h>

	#include <soc/tegra/bpmp.h>
	#include <soc/tegra/bpmp-abi.h>

	struct tegra_powergate_info {
	unsigned int id;
	char *name;
	};

	struct tegra_powergate {
	struct generic_pm_domain genpd;
	struct tegra_bpmp *bpmp;
	unsigned int id;
	};

	static inline struct tegra_powergate *
	to_tegra_powergate(struct generic_pm_domain *genpd)
	{
	return container_of(genpd, struct tegra_powergate, genpd);
	}

	static int tegra_bpmp_powergate_set_state(struct tegra_bpmp *bpmp,
	unsigned int id, u32 state)
	{
	struct mrq_pg_request request;
	struct tegra_bpmp_message msg;
	int err;

	memset(&request, 0, sizeof(request));
	request.cmd = CMD_PG_SET_STATE;
	request.id = id;
	request.set_state.state = state;

	memset(&msg, 0, sizeof(msg));
	msg.mrq = MRQ_PG;
	msg.tx.data = &request;
	msg.tx.size = sizeof(request);

	err = tegra_bpmp_transfer(bpmp, &msg);
	if (err < 0)
	return err;
	else if (msg.rx.ret < 0)
	return -EINVAL;

	return 0;
	}

	static int tegra_bpmp_powergate_get_state(struct tegra_bpmp *bpmp,
	unsigned int id)
	{
	struct mrq_pg_response response;
	struct mrq_pg_request request;
	struct tegra_bpmp_message msg;
	int err;

	memset(&request, 0, sizeof(request));
	request.cmd = CMD_PG_GET_STATE;
	request.id = id;

	memset(&response, 0, sizeof(response));

	memset(&msg, 0, sizeof(msg));
	msg.mrq = MRQ_PG;
	msg.tx.data = &request;
	msg.tx.size = sizeof(request);
	msg.rx.data = &response;
	msg.rx.size = sizeof(response);

	err = tegra_bpmp_transfer(bpmp, &msg);
	if (err < 0)
	return PG_STATE_OFF;
	else if (msg.rx.ret < 0)
	return -EINVAL;

	return response.get_state.state;
	}

	static int tegra_bpmp_powergate_get_max_id(struct tegra_bpmp *bpmp)
	{
	struct mrq_pg_response response;
	struct mrq_pg_request request;
	struct tegra_bpmp_message msg;
	int err;

	memset(&request, 0, sizeof(request));
	request.cmd = CMD_PG_GET_MAX_ID;

	memset(&response, 0, sizeof(response));

	memset(&msg, 0, sizeof(msg));
	msg.mrq = MRQ_PG;
	msg.tx.data = &request;
	msg.tx.size = sizeof(request);
	msg.rx.data = &response;
	msg.rx.size = sizeof(response);

	err = tegra_bpmp_transfer(bpmp, &msg);
	if (err < 0)
	return err;
	else if (msg.rx.ret < 0)
	return -EINVAL;

	return response.get_max_id.max_id;
	}

	static char tegra_bpmp_powergate_get_name(struct tegra_bpmp bpmp,
	unsigned int id)
	{
	struct mrq_pg_response response;
	struct mrq_pg_request request;
	struct tegra_bpmp_message msg;
	int err;

	memset(&request, 0, sizeof(request));
	request.cmd = CMD_PG_GET_NAME;
	request.id = id;

	memset(&response, 0, sizeof(response));

	memset(&msg, 0, sizeof(msg));
	msg.mrq = MRQ_PG;
	msg.tx.data = &request;
	msg.tx.size = sizeof(request);
	msg.rx.data = &response;
	msg.rx.size = sizeof(response);

	err = tegra_bpmp_transfer(bpmp, &msg);
	if (err < 0 \|\| msg.rx.ret < 0)
	return NULL;

	return kstrdup(response.get_name.name, GFP_KERNEL);
	}

	static inline bool tegra_bpmp_powergate_is_powered(struct tegra_bpmp *bpmp,
	unsigned int id)
	{
	return tegra_bpmp_powergate_get_state(bpmp, id) != PG_STATE_OFF;
	}

	static int tegra_powergate_power_on(struct generic_pm_domain *domain)
	{
	struct tegra_powergate *powergate = to_tegra_powergate(domain);
	struct tegra_bpmp *bpmp = powergate->bpmp;

	return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
	PG_STATE_ON);
	}

	static int tegra_powergate_power_off(struct generic_pm_domain *domain)
	{
	struct tegra_powergate *powergate = to_tegra_powergate(domain);
	struct tegra_bpmp *bpmp = powergate->bpmp;

	return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
	PG_STATE_OFF);
	}

	static struct tegra_powergate *
	tegra_powergate_add(struct tegra_bpmp *bpmp,
	const struct tegra_powergate_info *info)
	{
	struct tegra_powergate *powergate;
	bool off;
	int err;

	off = !tegra_bpmp_powergate_is_powered(bpmp, info->id);

	powergate = devm_kzalloc(bpmp->dev, sizeof(*powergate), GFP_KERNEL);
	if (!powergate)
	return ERR_PTR(-ENOMEM);

	powergate->id = info->id;
	powergate->bpmp = bpmp;

	powergate->genpd.name = kstrdup(info->name, GFP_KERNEL);
	powergate->genpd.power_on = tegra_powergate_power_on;
	powergate->genpd.power_off = tegra_powergate_power_off;

	err = pm_genpd_init(&powergate->genpd, NULL, off);
	if (err < 0) {
	kfree(powergate->genpd.name);
	return ERR_PTR(err);
	}

	return powergate;
	}

	static void tegra_powergate_remove(struct tegra_powergate *powergate)
	{
	struct generic_pm_domain *genpd = &powergate->genpd;
	struct tegra_bpmp *bpmp = powergate->bpmp;
	int err;

	err = pm_genpd_remove(genpd);
	if (err < 0)
	dev_err(bpmp->dev, "failed to remove power domain %s: %d\n",
	genpd->name, err);

	kfree(genpd->name);
	}

	static int
	tegra_bpmp_probe_powergates(struct tegra_bpmp *bpmp,
	struct tegra_powergate_info **powergatesp)
	{
	struct tegra_powergate_info *powergates;
	unsigned int max_id, id, count = 0;
	unsigned int num_holes = 0;
	int err;

	err = tegra_bpmp_powergate_get_max_id(bpmp);
	if (err < 0)
	return err;

	max_id = err;

	dev_dbg(bpmp->dev, "maximum powergate ID: %u\n", max_id);

	powergates = kcalloc(max_id + 1, sizeof(*powergates), GFP_KERNEL);
	if (!powergates)
	return -ENOMEM;

	for (id = 0; id <= max_id; id++) {
	struct tegra_powergate_info *info = &powergates[count];

	info->name = tegra_bpmp_powergate_get_name(bpmp, id);
	if (!info->name \|\| info->name[0] == '\0') {
	num_holes++;
	continue;
	}

	info->id = id;
	count++;
	}

	dev_dbg(bpmp->dev, "holes: %u\n", num_holes);

	*powergatesp = powergates;

	return count;
	}

	static int tegra_bpmp_add_powergates(struct tegra_bpmp *bpmp,
	struct tegra_powergate_info *powergates,
	unsigned int count)
	{
	struct genpd_onecell_data *genpd = &bpmp->genpd;
	struct generic_pm_domain **domains;
	struct tegra_powergate *powergate;
	unsigned int i;
	int err;

	domains = kcalloc(count, sizeof(*domains), GFP_KERNEL);
	if (!domains)
	return -ENOMEM;

	for (i = 0; i < count; i++) {
	powergate = tegra_powergate_add(bpmp, &powergates[i]);
	if (IS_ERR(powergate)) {
	err = PTR_ERR(powergate);
	goto remove;
	}

	dev_dbg(bpmp->dev, "added power domain %s\n",
	powergate->genpd.name);
	domains[i] = &powergate->genpd;
	}

	genpd->num_domains = count;
	genpd->domains = domains;

	return 0;

	remove:
	while (i--) {
	powergate = to_tegra_powergate(domains[i]);
	tegra_powergate_remove(powergate);
	}

	kfree(genpd->domains);
	return err;
	}

	static void tegra_bpmp_remove_powergates(struct tegra_bpmp *bpmp)
	{
	struct genpd_onecell_data *genpd = &bpmp->genpd;
	unsigned int i = genpd->num_domains;
	struct tegra_powergate *powergate;

	while (i--) {
	dev_dbg(bpmp->dev, "removing power domain %s\n",
	genpd->domains[i]->name);
	powergate = to_tegra_powergate(genpd->domains[i]);
	tegra_powergate_remove(powergate);
	}
	}

	static struct generic_pm_domain *
	tegra_powergate_xlate(struct of_phandle_args spec, void data)
	{
	struct generic_pm_domain *domain = ERR_PTR(-ENOENT);
	struct genpd_onecell_data *genpd = data;
	unsigned int i;

	for (i = 0; i < genpd->num_domains; i++) {
	struct tegra_powergate *powergate;

	powergate = to_tegra_powergate(genpd->domains[i]);
	if (powergate->id == spec->args[0]) {
	domain = &powergate->genpd;
	break;
	}
	}

	return domain;
	}

	int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp)
	{
	struct device_node *np = bpmp->dev->of_node;
	struct tegra_powergate_info *powergates;
	struct device *dev = bpmp->dev;
	unsigned int count, i;
	int err;

	err = tegra_bpmp_probe_powergates(bpmp, &powergates);
	if (err < 0)
	return err;

	count = err;

	dev_dbg(dev, "%u power domains probed\n", count);

	err = tegra_bpmp_add_powergates(bpmp, powergates, count);
	if (err < 0)
	goto free;

	bpmp->genpd.xlate = tegra_powergate_xlate;

	err = of_genpd_add_provider_onecell(np, &bpmp->genpd);
	if (err < 0) {
	dev_err(dev, "failed to add power domain provider: %d\n", err);
	tegra_bpmp_remove_powergates(bpmp);
	}

	free:
	for (i = 0; i < count; i++)
	kfree(powergates[i].name);

	kfree(powergates);
	return err;
	}