drivers/firmware/arm_scmi/power.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * System Control and Management Interface (SCMI) Power Protocol
  *
  * Copyright (C) 2018-2022 ARM Ltd.
  */

 #define pr_fmt(fmt) "SCMI Notifications POWER - " fmt

 #include <linux/module.h>
 #include <linux/scmi_protocol.h>

 #include "protocols.h"
 #include "notify.h"

 /* Updated only after ALL the mandatory features for that version are merged */
 #define SCMI_PROTOCOL_SUPPORTED_VERSION		0x30000

 enum scmi_power_protocol_cmd {
 	POWER_DOMAIN_ATTRIBUTES = 0x3,
 	POWER_STATE_SET = 0x4,
 	POWER_STATE_GET = 0x5,
 	POWER_STATE_NOTIFY = 0x6,
 	POWER_DOMAIN_NAME_GET = 0x8,
 };

 struct scmi_msg_resp_power_attributes {
 	__le16 num_domains;
 	__le16 reserved;
 	__le32 stats_addr_low;
 	__le32 stats_addr_high;
 	__le32 stats_size;
 };

 struct scmi_msg_resp_power_domain_attributes {
 	__le32 flags;
 #define SUPPORTS_STATE_SET_NOTIFY(x)	((x) & BIT(31))
 #define SUPPORTS_STATE_SET_ASYNC(x)	((x) & BIT(30))
 #define SUPPORTS_STATE_SET_SYNC(x)	((x) & BIT(29))
 #define SUPPORTS_EXTENDED_NAMES(x)	((x) & BIT(27))
 	    u8 name[SCMI_SHORT_NAME_MAX_SIZE];
 };

 struct scmi_power_set_state {
 	__le32 flags;
 #define STATE_SET_ASYNC		BIT(0)
 	__le32 domain;
 	__le32 state;
 };

 struct scmi_power_state_notify {
 	__le32 domain;
 	__le32 notify_enable;
 };

 struct scmi_power_state_notify_payld {
 	__le32 agent_id;
 	__le32 domain_id;
 	__le32 power_state;
 };

 struct power_dom_info {
 	bool state_set_sync;
 	bool state_set_async;
 	bool state_set_notify;
 	char name[SCMI_MAX_STR_SIZE];
 };

 struct scmi_power_info {
 	u32 version;
 	bool notify_state_change_cmd;
 	int num_domains;
 	u64 stats_addr;
 	u32 stats_size;
 	struct power_dom_info *dom_info;
 };

 static int scmi_power_attributes_get(const struct scmi_protocol_handle *ph,
 				     struct scmi_power_info *pi)
 {
 	int ret;
 	struct scmi_xfer *t;
 	struct scmi_msg_resp_power_attributes *attr;

 	ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
 				      0, sizeof(*attr), &t);
 	if (ret)
 		return ret;

 	attr = t->rx.buf;

 	ret = ph->xops->do_xfer(ph, t);
 	if (!ret) {
 		pi->num_domains = le16_to_cpu(attr->num_domains);
 		pi->stats_addr = le32_to_cpu(attr->stats_addr_low) |
 				(u64)le32_to_cpu(attr->stats_addr_high) << 32;
 		pi->stats_size = le32_to_cpu(attr->stats_size);
 	}

 	ph->xops->xfer_put(ph, t);

 	if (!ret)
 		if (!ph->hops->protocol_msg_check(ph, POWER_STATE_NOTIFY, NULL))
 			pi->notify_state_change_cmd = true;

 	return ret;
 }

 static int
 scmi_power_domain_attributes_get(const struct scmi_protocol_handle *ph,
 				 u32 domain, struct power_dom_info *dom_info,
 				 u32 version, bool notify_state_change_cmd)
 {
 	int ret;
 	u32 flags;
 	struct scmi_xfer *t;
 	struct scmi_msg_resp_power_domain_attributes *attr;

 	ret = ph->xops->xfer_get_init(ph, POWER_DOMAIN_ATTRIBUTES,
 				      sizeof(domain), sizeof(*attr), &t);
 	if (ret)
 		return ret;

 	put_unaligned_le32(domain, t->tx.buf);
 	attr = t->rx.buf;

 	ret = ph->xops->do_xfer(ph, t);
 	if (!ret) {
 		flags = le32_to_cpu(attr->flags);

 		if (notify_state_change_cmd)
 			dom_info->state_set_notify =
 				SUPPORTS_STATE_SET_NOTIFY(flags);
 		dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags);
 		dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags);
 		strscpy(dom_info->name, attr->name, SCMI_SHORT_NAME_MAX_SIZE);
 	}
 	ph->xops->xfer_put(ph, t);

 	/*
 	 * If supported overwrite short name with the extended one;
 	 * on error just carry on and use already provided short name.
 	 */
 	if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x3 &&
 	    SUPPORTS_EXTENDED_NAMES(flags)) {
 		ph->hops->extended_name_get(ph, POWER_DOMAIN_NAME_GET,
 					    domain, NULL, dom_info->name,
 					    SCMI_MAX_STR_SIZE);
 	}

 	return ret;
 }

 static int scmi_power_state_set(const struct scmi_protocol_handle *ph,
 				u32 domain, u32 state)
 {
 	int ret;
 	struct scmi_xfer *t;
 	struct scmi_power_set_state *st;

 	ret = ph->xops->xfer_get_init(ph, POWER_STATE_SET, sizeof(*st), 0, &t);
 	if (ret)
 		return ret;

 	st = t->tx.buf;
 	st->flags = cpu_to_le32(0);
 	st->domain = cpu_to_le32(domain);
 	st->state = cpu_to_le32(state);

 	ret = ph->xops->do_xfer(ph, t);

 	ph->xops->xfer_put(ph, t);
 	return ret;
 }

 static int scmi_power_state_get(const struct scmi_protocol_handle *ph,
 				u32 domain, u32 *state)
 {
 	int ret;
 	struct scmi_xfer *t;

 	ret = ph->xops->xfer_get_init(ph, POWER_STATE_GET, sizeof(u32), sizeof(u32), &t);
 	if (ret)
 		return ret;

 	put_unaligned_le32(domain, t->tx.buf);

 	ret = ph->xops->do_xfer(ph, t);
 	if (!ret)
 		*state = get_unaligned_le32(t->rx.buf);

 	ph->xops->xfer_put(ph, t);
 	return ret;
 }

 static int scmi_power_num_domains_get(const struct scmi_protocol_handle *ph)
 {
 	struct scmi_power_info *pi = ph->get_priv(ph);

 	return pi->num_domains;
 }

 static const char *
 scmi_power_name_get(const struct scmi_protocol_handle *ph,
 		    u32 domain)
 {
 	struct scmi_power_info *pi = ph->get_priv(ph);
 	struct power_dom_info *dom = pi->dom_info + domain;

 	return dom->name;
 }

 static const struct scmi_power_proto_ops power_proto_ops = {
 	.num_domains_get = scmi_power_num_domains_get,
 	.name_get = scmi_power_name_get,
 	.state_set = scmi_power_state_set,
 	.state_get = scmi_power_state_get,
 };

 static int scmi_power_request_notify(const struct scmi_protocol_handle *ph,
 				     u32 domain, bool enable)
 {
 	int ret;
 	struct scmi_xfer *t;
 	struct scmi_power_state_notify *notify;

 	ret = ph->xops->xfer_get_init(ph, POWER_STATE_NOTIFY,
 				      sizeof(*notify), 0, &t);
 	if (ret)
 		return ret;

 	notify = t->tx.buf;
 	notify->domain = cpu_to_le32(domain);
 	notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;

 	ret = ph->xops->do_xfer(ph, t);

 	ph->xops->xfer_put(ph, t);
 	return ret;
 }

 static bool scmi_power_notify_supported(const struct scmi_protocol_handle *ph,
 					u8 evt_id, u32 src_id)
 {
 	struct power_dom_info *dom;
 	struct scmi_power_info *pinfo = ph->get_priv(ph);

 	if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED ||
 	    src_id >= pinfo->num_domains)
 		return false;

 	dom = pinfo->dom_info + src_id;
 	return dom->state_set_notify;
 }

 static int scmi_power_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					 u8 evt_id, u32 src_id, bool enable)
 {
 	int ret;

 	ret = scmi_power_request_notify(ph, src_id, enable);
 	if (ret)
 		pr_debug("FAIL_ENABLE - evt[%X] dom[%d] - ret:%d\n",
 			 evt_id, src_id, ret);

 	return ret;
 }

 static void *
 scmi_power_fill_custom_report(const struct scmi_protocol_handle *ph,
 			      u8 evt_id, ktime_t timestamp,
 			      const void *payld, size_t payld_sz,
 			      void *report, u32 *src_id)
 {
 	const struct scmi_power_state_notify_payld *p = payld;
 	struct scmi_power_state_changed_report *r = report;

 	if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED || sizeof(*p) != payld_sz)
 		return NULL;

 	r->timestamp = timestamp;
 	r->agent_id = le32_to_cpu(p->agent_id);
 	r->domain_id = le32_to_cpu(p->domain_id);
 	r->power_state = le32_to_cpu(p->power_state);
 	*src_id = r->domain_id;

 	return r;
 }

 static int scmi_power_get_num_sources(const struct scmi_protocol_handle *ph)
 {
 	struct scmi_power_info *pinfo = ph->get_priv(ph);

 	if (!pinfo)
 		return -EINVAL;

 	return pinfo->num_domains;
 }

 static const struct scmi_event power_events[] = {
 	{
 		.id = SCMI_EVENT_POWER_STATE_CHANGED,
 		.max_payld_sz = sizeof(struct scmi_power_state_notify_payld),
 		.max_report_sz =
 			sizeof(struct scmi_power_state_changed_report),
 	},
 };

 static const struct scmi_event_ops power_event_ops = {
 	.is_notify_supported = scmi_power_notify_supported,
 	.get_num_sources = scmi_power_get_num_sources,
 	.set_notify_enabled = scmi_power_set_notify_enabled,
 	.fill_custom_report = scmi_power_fill_custom_report,
 };

 static const struct scmi_protocol_events power_protocol_events = {
 	.queue_sz = SCMI_PROTO_QUEUE_SZ,
 	.ops = &power_event_ops,
 	.evts = power_events,
 	.num_events = ARRAY_SIZE(power_events),
 };

 static int scmi_power_protocol_init(const struct scmi_protocol_handle *ph)
 {
 	int domain, ret;
 	u32 version;
 	struct scmi_power_info *pinfo;

 	ret = ph->xops->version_get(ph, &version);
 	if (ret)
 		return ret;

 	dev_dbg(ph->dev, "Power Version %d.%d\n",
 		PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));

 	pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
 	if (!pinfo)
 		return -ENOMEM;

 	ret = scmi_power_attributes_get(ph, pinfo);
 	if (ret)
 		return ret;

 	pinfo->dom_info = devm_kcalloc(ph->dev, pinfo->num_domains,
 				       sizeof(*pinfo->dom_info), GFP_KERNEL);
 	if (!pinfo->dom_info)
 		return -ENOMEM;

 	for (domain = 0; domain < pinfo->num_domains; domain++) {
 		struct power_dom_info *dom = pinfo->dom_info + domain;

 		scmi_power_domain_attributes_get(ph, domain, dom, version,
 						 pinfo->notify_state_change_cmd);
 	}

 	pinfo->version = version;

 	return ph->set_priv(ph, pinfo, version);
 }

 static const struct scmi_protocol scmi_power = {
 	.id = SCMI_PROTOCOL_POWER,
 	.owner = THIS_MODULE,
 	.instance_init = &scmi_power_protocol_init,
 	.ops = &power_proto_ops,
 	.events = &power_protocol_events,
 	.supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
 };

 DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(power, scmi_power)
	// SPDX-License-Identifier: GPL-2.0
	/*
	* System Control and Management Interface (SCMI) Power Protocol
	*
	* Copyright (C) 2018-2022 ARM Ltd.
	*/

	#define pr_fmt(fmt) "SCMI Notifications POWER - " fmt

	#include <linux/module.h>
	#include <linux/scmi_protocol.h>

	#include "protocols.h"
	#include "notify.h"

	/* Updated only after ALL the mandatory features for that version are merged */
	#define SCMI_PROTOCOL_SUPPORTED_VERSION 0x30000

	enum scmi_power_protocol_cmd {
	POWER_DOMAIN_ATTRIBUTES = 0x3,
	POWER_STATE_SET = 0x4,
	POWER_STATE_GET = 0x5,
	POWER_STATE_NOTIFY = 0x6,
	POWER_DOMAIN_NAME_GET = 0x8,
	};

	struct scmi_msg_resp_power_attributes {
	__le16 num_domains;
	__le16 reserved;
	__le32 stats_addr_low;
	__le32 stats_addr_high;
	__le32 stats_size;
	};

	struct scmi_msg_resp_power_domain_attributes {
	__le32 flags;
	#define SUPPORTS_STATE_SET_NOTIFY(x) ((x) & BIT(31))
	#define SUPPORTS_STATE_SET_ASYNC(x) ((x) & BIT(30))
	#define SUPPORTS_STATE_SET_SYNC(x) ((x) & BIT(29))
	#define SUPPORTS_EXTENDED_NAMES(x) ((x) & BIT(27))
	u8 name[SCMI_SHORT_NAME_MAX_SIZE];
	};

	struct scmi_power_set_state {
	__le32 flags;
	#define STATE_SET_ASYNC BIT(0)
	__le32 domain;
	__le32 state;
	};

	struct scmi_power_state_notify {
	__le32 domain;
	__le32 notify_enable;
	};

	struct scmi_power_state_notify_payld {
	__le32 agent_id;
	__le32 domain_id;
	__le32 power_state;
	};

	struct power_dom_info {
	bool state_set_sync;
	bool state_set_async;
	bool state_set_notify;
	char name[SCMI_MAX_STR_SIZE];
	};

	struct scmi_power_info {
	u32 version;
	bool notify_state_change_cmd;
	int num_domains;
	u64 stats_addr;
	u32 stats_size;
	struct power_dom_info *dom_info;
	};

	static int scmi_power_attributes_get(const struct scmi_protocol_handle *ph,
	struct scmi_power_info *pi)
	{
	int ret;
	struct scmi_xfer *t;
	struct scmi_msg_resp_power_attributes *attr;

	ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
	0, sizeof(*attr), &t);
	if (ret)
	return ret;

	attr = t->rx.buf;

	ret = ph->xops->do_xfer(ph, t);
	if (!ret) {
	pi->num_domains = le16_to_cpu(attr->num_domains);
	pi->stats_addr = le32_to_cpu(attr->stats_addr_low) \|
	(u64)le32_to_cpu(attr->stats_addr_high) << 32;
	pi->stats_size = le32_to_cpu(attr->stats_size);
	}

	ph->xops->xfer_put(ph, t);

	if (!ret)
	if (!ph->hops->protocol_msg_check(ph, POWER_STATE_NOTIFY, NULL))
	pi->notify_state_change_cmd = true;

	return ret;
	}

	static int
	scmi_power_domain_attributes_get(const struct scmi_protocol_handle *ph,
	u32 domain, struct power_dom_info *dom_info,
	u32 version, bool notify_state_change_cmd)
	{
	int ret;
	u32 flags;
	struct scmi_xfer *t;
	struct scmi_msg_resp_power_domain_attributes *attr;

	ret = ph->xops->xfer_get_init(ph, POWER_DOMAIN_ATTRIBUTES,
	sizeof(domain), sizeof(*attr), &t);
	if (ret)
	return ret;

	put_unaligned_le32(domain, t->tx.buf);
	attr = t->rx.buf;

	ret = ph->xops->do_xfer(ph, t);
	if (!ret) {
	flags = le32_to_cpu(attr->flags);

	if (notify_state_change_cmd)
	dom_info->state_set_notify =
	SUPPORTS_STATE_SET_NOTIFY(flags);
	dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags);
	dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags);
	strscpy(dom_info->name, attr->name, SCMI_SHORT_NAME_MAX_SIZE);
	}
	ph->xops->xfer_put(ph, t);

	/*
	* If supported overwrite short name with the extended one;
	* on error just carry on and use already provided short name.
	*/
	if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x3 &&
	SUPPORTS_EXTENDED_NAMES(flags)) {
	ph->hops->extended_name_get(ph, POWER_DOMAIN_NAME_GET,
	domain, NULL, dom_info->name,
	SCMI_MAX_STR_SIZE);
	}

	return ret;
	}

	static int scmi_power_state_set(const struct scmi_protocol_handle *ph,
	u32 domain, u32 state)
	{
	int ret;
	struct scmi_xfer *t;
	struct scmi_power_set_state *st;

	ret = ph->xops->xfer_get_init(ph, POWER_STATE_SET, sizeof(*st), 0, &t);
	if (ret)
	return ret;

	st = t->tx.buf;
	st->flags = cpu_to_le32(0);
	st->domain = cpu_to_le32(domain);
	st->state = cpu_to_le32(state);

	ret = ph->xops->do_xfer(ph, t);

	ph->xops->xfer_put(ph, t);
	return ret;
	}

	static int scmi_power_state_get(const struct scmi_protocol_handle *ph,
	u32 domain, u32 *state)
	{
	int ret;
	struct scmi_xfer *t;

	ret = ph->xops->xfer_get_init(ph, POWER_STATE_GET, sizeof(u32), sizeof(u32), &t);
	if (ret)
	return ret;

	put_unaligned_le32(domain, t->tx.buf);

	ret = ph->xops->do_xfer(ph, t);
	if (!ret)
	*state = get_unaligned_le32(t->rx.buf);

	ph->xops->xfer_put(ph, t);
	return ret;
	}

	static int scmi_power_num_domains_get(const struct scmi_protocol_handle *ph)
	{
	struct scmi_power_info *pi = ph->get_priv(ph);

	return pi->num_domains;
	}

	static const char *
	scmi_power_name_get(const struct scmi_protocol_handle *ph,
	u32 domain)
	{
	struct scmi_power_info *pi = ph->get_priv(ph);
	struct power_dom_info *dom = pi->dom_info + domain;

	return dom->name;
	}

	static const struct scmi_power_proto_ops power_proto_ops = {
	.num_domains_get = scmi_power_num_domains_get,
	.name_get = scmi_power_name_get,
	.state_set = scmi_power_state_set,
	.state_get = scmi_power_state_get,
	};

	static int scmi_power_request_notify(const struct scmi_protocol_handle *ph,
	u32 domain, bool enable)
	{
	int ret;
	struct scmi_xfer *t;
	struct scmi_power_state_notify *notify;

	ret = ph->xops->xfer_get_init(ph, POWER_STATE_NOTIFY,
	sizeof(*notify), 0, &t);
	if (ret)
	return ret;

	notify = t->tx.buf;
	notify->domain = cpu_to_le32(domain);
	notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;

	ret = ph->xops->do_xfer(ph, t);

	ph->xops->xfer_put(ph, t);
	return ret;
	}

	static bool scmi_power_notify_supported(const struct scmi_protocol_handle *ph,
	u8 evt_id, u32 src_id)
	{
	struct power_dom_info *dom;
	struct scmi_power_info *pinfo = ph->get_priv(ph);

	if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED \|\|
	src_id >= pinfo->num_domains)
	return false;

	dom = pinfo->dom_info + src_id;
	return dom->state_set_notify;
	}

	static int scmi_power_set_notify_enabled(const struct scmi_protocol_handle *ph,
	u8 evt_id, u32 src_id, bool enable)
	{
	int ret;

	ret = scmi_power_request_notify(ph, src_id, enable);
	if (ret)
	pr_debug("FAIL_ENABLE - evt[%X] dom[%d] - ret:%d\n",
	evt_id, src_id, ret);

	return ret;
	}

	static void *
	scmi_power_fill_custom_report(const struct scmi_protocol_handle *ph,
	u8 evt_id, ktime_t timestamp,
	const void *payld, size_t payld_sz,
	void report, u32 src_id)
	{
	const struct scmi_power_state_notify_payld *p = payld;
	struct scmi_power_state_changed_report *r = report;

	if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED \|\| sizeof(*p) != payld_sz)
	return NULL;

	r->timestamp = timestamp;
	r->agent_id = le32_to_cpu(p->agent_id);
	r->domain_id = le32_to_cpu(p->domain_id);
	r->power_state = le32_to_cpu(p->power_state);
	*src_id = r->domain_id;

	return r;
	}

	static int scmi_power_get_num_sources(const struct scmi_protocol_handle *ph)
	{
	struct scmi_power_info *pinfo = ph->get_priv(ph);

	if (!pinfo)
	return -EINVAL;

	return pinfo->num_domains;
	}

	static const struct scmi_event power_events[] = {
	{
	.id = SCMI_EVENT_POWER_STATE_CHANGED,
	.max_payld_sz = sizeof(struct scmi_power_state_notify_payld),
	.max_report_sz =
	sizeof(struct scmi_power_state_changed_report),
	},
	};

	static const struct scmi_event_ops power_event_ops = {
	.is_notify_supported = scmi_power_notify_supported,
	.get_num_sources = scmi_power_get_num_sources,
	.set_notify_enabled = scmi_power_set_notify_enabled,
	.fill_custom_report = scmi_power_fill_custom_report,
	};

	static const struct scmi_protocol_events power_protocol_events = {
	.queue_sz = SCMI_PROTO_QUEUE_SZ,
	.ops = &power_event_ops,
	.evts = power_events,
	.num_events = ARRAY_SIZE(power_events),
	};

	static int scmi_power_protocol_init(const struct scmi_protocol_handle *ph)
	{
	int domain, ret;
	u32 version;
	struct scmi_power_info *pinfo;

	ret = ph->xops->version_get(ph, &version);
	if (ret)
	return ret;

	dev_dbg(ph->dev, "Power Version %d.%d\n",
	PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));

	pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
	if (!pinfo)
	return -ENOMEM;

	ret = scmi_power_attributes_get(ph, pinfo);
	if (ret)
	return ret;

	pinfo->dom_info = devm_kcalloc(ph->dev, pinfo->num_domains,
	sizeof(*pinfo->dom_info), GFP_KERNEL);
	if (!pinfo->dom_info)
	return -ENOMEM;

	for (domain = 0; domain < pinfo->num_domains; domain++) {
	struct power_dom_info *dom = pinfo->dom_info + domain;

	scmi_power_domain_attributes_get(ph, domain, dom, version,
	pinfo->notify_state_change_cmd);
	}

	pinfo->version = version;

	return ph->set_priv(ph, pinfo, version);
	}

	static const struct scmi_protocol scmi_power = {
	.id = SCMI_PROTOCOL_POWER,
	.owner = THIS_MODULE,
	.instance_init = &scmi_power_protocol_init,
	.ops = &power_proto_ops,
	.events = &power_protocol_events,
	.supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
	};

	DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(power, scmi_power)