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firmware: arm_scmi: Add power notifications support 

Make SCMI power protocol register with the notification core.

Link: https://lore.kernel.org/r/20200701155348.52864-6-cristian.marussi@arm.com
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2020-07-01 16:53:44 +01:00 committed by Sudeep Holla
parent 6b8a69131d
commit e27077bc04
2 changed files with 98 additions and 6 deletions
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92
drivers/firmware/arm_scmi/power.c
View File

@ -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;

12
include/linux/scmi_protocol.h
View File

@ -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 */