[PATCH v6 09/13] firmware: arm_scmi: Add Power notifications support

[Cristian Marussi <cristian.marussi@arm.com>]

Make SCMI Power protocol register with the notification core.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
V5 --> V6
- added handle argument to fill_custom_report()
V4 --> V5
- fixed unsual return construct
V3 --> V4
- scmi_event field renamed
V2 --> V3
- added handle awareness
V1 --> V2
- simplified .set_notify_enabled() implementation moving the ALL_SRCIDs
  logic out of protocol. ALL_SRCIDs logic is now in charge of the
  notification core, together with proper reference counting of enables
- switched to devres protocol-registration
---
 drivers/firmware/arm_scmi/power.c | 124 ++++++++++++++++++++++++++++++
 include/linux/scmi_protocol.h     |  15 ++++
 2 files changed, 139 insertions(+)

diff --git a/drivers/firmware/arm_scmi/power.c b/drivers/firmware/arm_scmi/power.c
index cf7f0312381b..9ddfa0d822c3 100644
--- a/drivers/firmware/arm_scmi/power.c
+++ b/drivers/firmware/arm_scmi/power.c
@@ -6,6 +6,7 @@
  */
 
 #include "common.h"
+#include "notify.h"
 
 enum scmi_power_protocol_cmd {
 	POWER_DOMAIN_ATTRIBUTES = 0x3,
@@ -48,6 +49,12 @@ 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;
@@ -63,6 +70,11 @@ struct scmi_power_info {
 	struct power_dom_info *dom_info;
 };
 
+static enum scmi_power_protocol_cmd evt_2_cmd[] = {
+	POWER_STATE_NOTIFY,
+	POWER_STATE_CHANGE_REQUESTED_NOTIFY,
+};
+
 static int scmi_power_attributes_get(const struct scmi_handle *handle,
 				     struct scmi_power_info *pi)
 {
@@ -186,6 +198,112 @@ 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, int message_id, bool enable)
+{
+	int ret;
+	struct scmi_xfer *t;
+	struct scmi_power_state_notify *notify;
+
+	ret = scmi_xfer_get_init(handle, message_id, 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 bool scmi_power_set_notify_enabled(const struct scmi_handle *handle,
+					  u8 evt_id, u32 src_id, bool enable)
+{
+	int ret, cmd_id;
+
+	cmd_id = MAP_EVT_TO_ENABLE_CMD(evt_id, evt_2_cmd);
+	if (cmd_id < 0)
+		return false;
+
+	ret = scmi_power_request_notify(handle, src_id, cmd_id, enable);
+	if (ret)
+		pr_warn("SCMI Notifications - Proto:%X - FAIL_ENABLE - evt[%X] dom[%d] - ret:%d\n",
+				SCMI_PROTOCOL_POWER, 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)
+{
+	void *rep = NULL;
+
+	switch (evt_id) {
+	case POWER_STATE_CHANGED:
+	{
+		const struct scmi_power_state_notify_payld *p = payld;
+		struct scmi_power_state_changed_report *r = report;
+
+		if (sizeof(*p) != payld_sz)
+			break;
+
+		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;
+		rep = r;
+		break;
+	}
+	case POWER_STATE_CHANGE_REQUESTED:
+	{
+		const struct scmi_power_state_notify_payld *p = payld;
+		struct scmi_power_state_change_requested_report *r = report;
+
+		if (sizeof(*p) != payld_sz)
+			break;
+
+		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;
+		rep = r;
+		break;
+	}
+	default:
+		break;
+	}
+
+	return rep;
+}
+
+static const struct scmi_event power_events[] = {
+	{
+		.id = POWER_STATE_CHANGED,
+		.max_payld_sz = 12,
+		.max_report_sz =
+			sizeof(struct scmi_power_state_changed_report),
+	},
+	{
+		.id = POWER_STATE_CHANGE_REQUESTED,
+		.max_payld_sz = 12,
+		.max_report_sz =
+			sizeof(struct scmi_power_state_change_requested_report),
+	},
+};
+
+static const struct scmi_protocol_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 +332,12 @@ 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, PAGE_SIZE,
+				      &power_event_ops, power_events,
+				      ARRAY_SIZE(power_events),
+				      pinfo->num_domains);
+
 	pinfo->version = version;
 	handle->power_ops = &power_ops;
 	handle->power_priv = pinfo;
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 934b91d29311..0b602c32efd1 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -374,4 +374,19 @@ 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 */
+struct scmi_power_state_changed_report {
+	ktime_t	timestamp;
+	u32	agent_id;
+	u32	domain_id;
+	u32	power_state;
+};
+
+struct scmi_power_state_change_requested_report {
+	ktime_t	timestamp;
+	u32	agent_id;
+	u32	domain_id;
+	u32	power_state;
+};
+
 #endif /* _LINUX_SCMI_PROTOCOL_H */
-- 
2.17.1