159 lines
3.8 KiB
C
159 lines
3.8 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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__le32 timeout;
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};
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struct scmi_system_info {
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u32 version;
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bool graceful_timeout_supported;
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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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size_t expected_sz;
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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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struct scmi_system_info *pinfo = ph->get_priv(ph);
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expected_sz = pinfo->graceful_timeout_supported ?
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sizeof(*p) : sizeof(*p) - sizeof(__le32);
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if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER ||
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payld_sz != expected_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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if (pinfo->graceful_timeout_supported &&
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r->system_state == SCMI_SYSTEM_SHUTDOWN &&
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SCMI_SYSPOWER_IS_REQUEST_GRACEFUL(r->flags))
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r->timeout = le32_to_cpu(p->timeout);
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else
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r->timeout = 0x00;
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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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if (PROTOCOL_REV_MAJOR(pinfo->version) >= 0x2)
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pinfo->graceful_timeout_supported = true;
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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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