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path: root/drivers/firmware/arm_scmi/system.c
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Diffstat (limited to 'drivers/firmware/arm_scmi/system.c')
-rw-r--r--drivers/firmware/arm_scmi/system.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/drivers/firmware/arm_scmi/system.c b/drivers/firmware/arm_scmi/system.c
new file mode 100644
index 0000000000..9383d75845
--- /dev/null
+++ b/drivers/firmware/arm_scmi/system.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Control and Management Interface (SCMI) System Power Protocol
+ *
+ * Copyright (C) 2020-2022 ARM Ltd.
+ */
+
+#define pr_fmt(fmt) "SCMI Notifications SYSTEM - " fmt
+
+#include <linux/module.h>
+#include <linux/scmi_protocol.h>
+
+#include "protocols.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;
+ __le32 timeout;
+};
+
+struct scmi_system_info {
+ u32 version;
+ bool graceful_timeout_supported;
+};
+
+static int scmi_system_request_notify(const struct scmi_protocol_handle *ph,
+ bool enable)
+{
+ int ret;
+ struct scmi_xfer *t;
+ struct scmi_system_power_state_notify *notify;
+
+ ret = ph->xops->xfer_get_init(ph, SYSTEM_POWER_STATE_NOTIFY,
+ sizeof(*notify), 0, &t);
+ if (ret)
+ return ret;
+
+ notify = t->tx.buf;
+ notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
+
+ ret = ph->xops->do_xfer(ph, t);
+
+ ph->xops->xfer_put(ph, t);
+ return ret;
+}
+
+static int scmi_system_set_notify_enabled(const struct scmi_protocol_handle *ph,
+ u8 evt_id, u32 src_id, bool enable)
+{
+ int ret;
+
+ ret = scmi_system_request_notify(ph, 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_protocol_handle *ph,
+ u8 evt_id, ktime_t timestamp,
+ const void *payld, size_t payld_sz,
+ void *report, u32 *src_id)
+{
+ size_t expected_sz;
+ const struct scmi_system_power_state_notifier_payld *p = payld;
+ struct scmi_system_power_state_notifier_report *r = report;
+ struct scmi_system_info *pinfo = ph->get_priv(ph);
+
+ expected_sz = pinfo->graceful_timeout_supported ?
+ sizeof(*p) : sizeof(*p) - sizeof(__le32);
+ if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER ||
+ payld_sz != expected_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);
+ if (pinfo->graceful_timeout_supported &&
+ r->system_state == SCMI_SYSTEM_SHUTDOWN &&
+ SCMI_SYSPOWER_IS_REQUEST_GRACEFUL(r->flags))
+ r->timeout = le32_to_cpu(p->timeout);
+ else
+ r->timeout = 0x00;
+ *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 const struct scmi_protocol_events system_protocol_events = {
+ .queue_sz = SCMI_PROTO_QUEUE_SZ,
+ .ops = &system_event_ops,
+ .evts = system_events,
+ .num_events = ARRAY_SIZE(system_events),
+ .num_sources = SCMI_SYSTEM_NUM_SOURCES,
+};
+
+static int scmi_system_protocol_init(const struct scmi_protocol_handle *ph)
+{
+ int ret;
+ u32 version;
+ struct scmi_system_info *pinfo;
+
+ ret = ph->xops->version_get(ph, &version);
+ if (ret)
+ return ret;
+
+ dev_dbg(ph->dev, "System Power Version %d.%d\n",
+ PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
+
+ pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
+ if (!pinfo)
+ return -ENOMEM;
+
+ pinfo->version = version;
+ if (PROTOCOL_REV_MAJOR(pinfo->version) >= 0x2)
+ pinfo->graceful_timeout_supported = true;
+
+ return ph->set_priv(ph, pinfo);
+}
+
+static const struct scmi_protocol scmi_system = {
+ .id = SCMI_PROTOCOL_SYSTEM,
+ .owner = THIS_MODULE,
+ .instance_init = &scmi_system_protocol_init,
+ .ops = NULL,
+ .events = &system_protocol_events,
+};
+
+DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(system, scmi_system)