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23136bff80
Move some SCMI protocol specific definitions from common.h into a the new dedicated protocols.h header so that SCMI protocols core code can include only what it needs; this is going to be useful to avoid the risk of growing indefinitely the dimension of common.h, especially when introducing some common protocols helper functions. Header common.h will continue to be included by SCMI core and transport layers. Link: https://lore.kernel.org/r/20220330150551.2573938-10-cristian.marussi@arm.com Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* System Control and Management Interface (SCMI) System Power Protocol
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*
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* Copyright (C) 2020-2022 ARM Ltd.
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*/
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#define pr_fmt(fmt) "SCMI Notifications SYSTEM - " fmt
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#include <linux/module.h>
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#include <linux/scmi_protocol.h>
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#include "protocols.h"
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#include "notify.h"
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#define SCMI_SYSTEM_NUM_SOURCES 1
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enum scmi_system_protocol_cmd {
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SYSTEM_POWER_STATE_NOTIFY = 0x5,
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};
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struct scmi_system_power_state_notify {
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__le32 notify_enable;
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};
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struct scmi_system_power_state_notifier_payld {
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__le32 agent_id;
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__le32 flags;
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__le32 system_state;
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};
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struct scmi_system_info {
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u32 version;
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};
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static int scmi_system_request_notify(const struct scmi_protocol_handle *ph,
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bool enable)
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{
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int ret;
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struct scmi_xfer *t;
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struct scmi_system_power_state_notify *notify;
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ret = ph->xops->xfer_get_init(ph, SYSTEM_POWER_STATE_NOTIFY,
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sizeof(*notify), 0, &t);
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if (ret)
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return ret;
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notify = t->tx.buf;
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notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
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ret = ph->xops->do_xfer(ph, t);
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ph->xops->xfer_put(ph, t);
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return ret;
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}
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static int scmi_system_set_notify_enabled(const struct scmi_protocol_handle *ph,
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u8 evt_id, u32 src_id, bool enable)
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{
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int ret;
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ret = scmi_system_request_notify(ph, enable);
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if (ret)
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pr_debug("FAIL_ENABLE - evt[%X] - ret:%d\n", evt_id, ret);
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return ret;
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}
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static void *
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scmi_system_fill_custom_report(const struct scmi_protocol_handle *ph,
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u8 evt_id, ktime_t timestamp,
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const void *payld, size_t payld_sz,
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void *report, u32 *src_id)
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{
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const struct scmi_system_power_state_notifier_payld *p = payld;
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struct scmi_system_power_state_notifier_report *r = report;
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if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER ||
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sizeof(*p) != payld_sz)
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return NULL;
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r->timestamp = timestamp;
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r->agent_id = le32_to_cpu(p->agent_id);
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r->flags = le32_to_cpu(p->flags);
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r->system_state = le32_to_cpu(p->system_state);
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*src_id = 0;
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return r;
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}
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static const struct scmi_event system_events[] = {
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{
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.id = SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER,
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.max_payld_sz =
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sizeof(struct scmi_system_power_state_notifier_payld),
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.max_report_sz =
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sizeof(struct scmi_system_power_state_notifier_report),
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},
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};
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static const struct scmi_event_ops system_event_ops = {
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.set_notify_enabled = scmi_system_set_notify_enabled,
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.fill_custom_report = scmi_system_fill_custom_report,
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};
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static const struct scmi_protocol_events system_protocol_events = {
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.queue_sz = SCMI_PROTO_QUEUE_SZ,
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.ops = &system_event_ops,
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.evts = system_events,
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.num_events = ARRAY_SIZE(system_events),
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.num_sources = SCMI_SYSTEM_NUM_SOURCES,
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};
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static int scmi_system_protocol_init(const struct scmi_protocol_handle *ph)
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{
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int ret;
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u32 version;
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struct scmi_system_info *pinfo;
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ret = ph->xops->version_get(ph, &version);
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if (ret)
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return ret;
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dev_dbg(ph->dev, "System Power Version %d.%d\n",
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PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
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pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
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if (!pinfo)
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return -ENOMEM;
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pinfo->version = version;
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return ph->set_priv(ph, pinfo);
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}
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static const struct scmi_protocol scmi_system = {
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.id = SCMI_PROTOCOL_SYSTEM,
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.owner = THIS_MODULE,
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.instance_init = &scmi_system_protocol_init,
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.ops = NULL,
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.events = &system_protocol_events,
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};
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DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(system, scmi_system)
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