db15cd2926
Extend SCMI protocols accounting mechanism to address possible module usage and add the support to possibly define new protocols as loadable modules. Keep Standard protocols built into the SCMI core. Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Bug: 171409184 Link: https://lore.kernel.org/linux-arm-kernel/20210202221555.41167-1-cristian.marussi@arm.com/ Change-Id: I75f2e400c0fe6a0692a1acc2e20f54a3c7336ab7 Signed-off-by: Rishabh Bhatnagar <quic_rishabhb@quicinc.com>
141 lines
3.3 KiB
C
141 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 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 "common.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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u32 version;
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struct scmi_system_info *pinfo;
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ph->xops->version_get(ph, &version);
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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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.init_instance = &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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