firmware: arm_scmi: Add power notifications support (e27077bc) · Commits · 戴 / test

drivers/firmware/arm_scmi/power.c

+86 −6

Original line number	Diff line number	Diff line
		@@ -5,19 +5,18 @@
		* Copyright (C) 2018 ARM Ltd.
		*/

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

		#include <linux/scmi_protocol.h>

		#include "common.h"
		#include "notify.h"

		enum scmi_power_protocol_cmd {
		POWER_DOMAIN_ATTRIBUTES = 0x3,
		POWER_STATE_SET = 0x4,
		POWER_STATE_GET = 0x5,
		POWER_STATE_NOTIFY = 0x6,
		POWER_STATE_CHANGE_REQUESTED_NOTIFY = 0x7,
		};

		enum scmi_power_protocol_notify {
		POWER_STATE_CHANGED = 0x0,
		POWER_STATE_CHANGE_REQUESTED = 0x1,
		};

		struct scmi_msg_resp_power_attributes {
		@@ -48,6 +47,12 @@ struct scmi_power_state_notify {
		__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;
		@@ -186,6 +191,75 @@ static struct scmi_power_ops power_ops = {
		.state_get = scmi_power_state_get,
		};

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

		ret = scmi_xfer_get_init(handle, POWER_STATE_NOTIFY,
		SCMI_PROTOCOL_POWER, 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 = scmi_do_xfer(handle, t);

		scmi_xfer_put(handle, t);
		return ret;
		}

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

		ret = scmi_power_request_notify(handle, 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_handle handle,
		u8 evt_id, u64 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 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 = {
		.set_notify_enabled = scmi_power_set_notify_enabled,
		.fill_custom_report = scmi_power_fill_custom_report,
		};

		static int scmi_power_protocol_init(struct scmi_handle *handle)
		{
		int domain;
		@@ -214,6 +288,12 @@ static int scmi_power_protocol_init(struct scmi_handle *handle)
		scmi_power_domain_attributes_get(handle, domain, dom);
		}

		scmi_register_protocol_events(handle,
		SCMI_PROTOCOL_POWER, SCMI_PROTO_QUEUE_SZ,
		&power_event_ops, power_events,
		ARRAY_SIZE(power_events),
		pinfo->num_domains);

		pinfo->version = version;
		handle->power_ops = &power_ops;
		handle->power_priv = pinfo;

include/linux/scmi_protocol.h

+12 −0

Original line number	Diff line number	Diff line
		@@ -375,4 +375,16 @@ typedef int (scmi_prot_init_fn_t)(struct scmi_handle );
		int scmi_protocol_register(int protocol_id, scmi_prot_init_fn_t fn);
		void scmi_protocol_unregister(int protocol_id);

		/* SCMI Notification API - Custom Event Reports */
		enum scmi_notification_events {
		SCMI_EVENT_POWER_STATE_CHANGED = 0x0,
		};

		struct scmi_power_state_changed_report {
		u64 timestamp;
		u32 agent_id;
		u32 domain_id;
		u32 power_state;
		};

		#endif /* _LINUX_SCMI_PROTOCOL_H */

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