mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 15:04:27 +08:00
a880305512
Add bare protocol support for SCMI system power protocol as needed by an OSPM agent: basic initialization and SYSTEM_POWER_STATE_NOTIFIER core notification support. No event-handling logic is attached to such notification.. Link: https://lore.kernel.org/r/20200907174657.32466-2-cristian.marussi@arm.com Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* System Control and Management Interface (SCMI) System Power Protocol
|
|
*
|
|
* Copyright (C) 2020 ARM Ltd.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "SCMI Notifications SYSTEM - " fmt
|
|
|
|
#include <linux/scmi_protocol.h>
|
|
|
|
#include "common.h"
|
|
#include "notify.h"
|
|
|
|
#define SCMI_SYSTEM_NUM_SOURCES 1
|
|
|
|
enum scmi_system_protocol_cmd {
|
|
SYSTEM_POWER_STATE_NOTIFY = 0x5,
|
|
};
|
|
|
|
struct scmi_system_power_state_notify {
|
|
__le32 notify_enable;
|
|
};
|
|
|
|
struct scmi_system_power_state_notifier_payld {
|
|
__le32 agent_id;
|
|
__le32 flags;
|
|
__le32 system_state;
|
|
};
|
|
|
|
struct scmi_system_info {
|
|
u32 version;
|
|
};
|
|
|
|
static int scmi_system_request_notify(const struct scmi_handle *handle,
|
|
bool enable)
|
|
{
|
|
int ret;
|
|
struct scmi_xfer *t;
|
|
struct scmi_system_power_state_notify *notify;
|
|
|
|
ret = scmi_xfer_get_init(handle, SYSTEM_POWER_STATE_NOTIFY,
|
|
SCMI_PROTOCOL_SYSTEM, sizeof(*notify), 0, &t);
|
|
if (ret)
|
|
return ret;
|
|
|
|
notify = t->tx.buf;
|
|
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_system_set_notify_enabled(const struct scmi_handle *handle,
|
|
u8 evt_id, u32 src_id, bool enable)
|
|
{
|
|
int ret;
|
|
|
|
ret = scmi_system_request_notify(handle, enable);
|
|
if (ret)
|
|
pr_debug("FAIL_ENABLE - evt[%X] - ret:%d\n", evt_id, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void *scmi_system_fill_custom_report(const struct scmi_handle *handle,
|
|
u8 evt_id, ktime_t timestamp,
|
|
const void *payld, size_t payld_sz,
|
|
void *report, u32 *src_id)
|
|
{
|
|
const struct scmi_system_power_state_notifier_payld *p = payld;
|
|
struct scmi_system_power_state_notifier_report *r = report;
|
|
|
|
if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER ||
|
|
sizeof(*p) != payld_sz)
|
|
return NULL;
|
|
|
|
r->timestamp = timestamp;
|
|
r->agent_id = le32_to_cpu(p->agent_id);
|
|
r->flags = le32_to_cpu(p->flags);
|
|
r->system_state = le32_to_cpu(p->system_state);
|
|
*src_id = 0;
|
|
|
|
return r;
|
|
}
|
|
|
|
static const struct scmi_event system_events[] = {
|
|
{
|
|
.id = SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER,
|
|
.max_payld_sz =
|
|
sizeof(struct scmi_system_power_state_notifier_payld),
|
|
.max_report_sz =
|
|
sizeof(struct scmi_system_power_state_notifier_report),
|
|
},
|
|
};
|
|
|
|
static const struct scmi_event_ops system_event_ops = {
|
|
.set_notify_enabled = scmi_system_set_notify_enabled,
|
|
.fill_custom_report = scmi_system_fill_custom_report,
|
|
};
|
|
|
|
static int scmi_system_protocol_init(struct scmi_handle *handle)
|
|
{
|
|
u32 version;
|
|
struct scmi_system_info *pinfo;
|
|
|
|
scmi_version_get(handle, SCMI_PROTOCOL_SYSTEM, &version);
|
|
|
|
dev_dbg(handle->dev, "System Power Version %d.%d\n",
|
|
PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
|
|
|
|
pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
|
|
if (!pinfo)
|
|
return -ENOMEM;
|
|
|
|
scmi_register_protocol_events(handle,
|
|
SCMI_PROTOCOL_SYSTEM, SCMI_PROTO_QUEUE_SZ,
|
|
&system_event_ops,
|
|
system_events,
|
|
ARRAY_SIZE(system_events),
|
|
SCMI_SYSTEM_NUM_SOURCES);
|
|
|
|
pinfo->version = version;
|
|
handle->system_priv = pinfo;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init scmi_system_init(void)
|
|
{
|
|
return scmi_protocol_register(SCMI_PROTOCOL_SYSTEM,
|
|
&scmi_system_protocol_init);
|
|
}
|
|
subsys_initcall(scmi_system_init);
|