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Message-Id: <20200427210806.37422-2-cristian.marussi@arm.com>
Date: Mon, 27 Apr 2020 22:08:04 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc: sudeep.holla@....com, lukasz.luba@....com,
james.quinlan@...adcom.com, Jonathan.Cameron@...wei.com,
cristian.marussi@....com
Subject: [RFC PATCH 1/3] firmware: arm_scmi: Add System Power Protocol support
Add bare protocol support for SCMI SystemPower 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 by this
commit.
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
drivers/firmware/arm_scmi/Makefile | 2 +-
drivers/firmware/arm_scmi/system.c | 146 +++++++++++++++++++++++++++++
include/linux/scmi_protocol.h | 17 ++++
3 files changed, 164 insertions(+), 1 deletion(-)
create mode 100644 drivers/firmware/arm_scmi/system.c
diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
index d55612362d65..e01b67bc74b4 100644
--- a/drivers/firmware/arm_scmi/Makefile
+++ b/drivers/firmware/arm_scmi/Makefile
@@ -5,5 +5,5 @@ scmi-driver-y = driver.o notify.o
scmi-transport-y = shmem.o
scmi-transport-$(CONFIG_MAILBOX) += mailbox.o
scmi-transport-$(CONFIG_HAVE_ARM_SMCCC) += smc.o
-scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o
+scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o system.o
obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o
diff --git a/drivers/firmware/arm_scmi/system.c b/drivers/firmware/arm_scmi/system.c
new file mode 100644
index 000000000000..9b43d9a873f3
--- /dev/null
+++ b/drivers/firmware/arm_scmi/system.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Control and Management Interface (SCMI) System Power Protocol
+ *
+ * Copyright (C) 2020 ARM Ltd.
+ */
+
+#include "common.h"
+#include "notify.h"
+
+#define SCMI_SYSTEM_NUM_SOURCES 1
+
+enum scmi_system_protocol_cmd {
+ SYSTEM_POWER_STATE_NOTIFY = 0x5,
+};
+
+enum scmi_system_protocol_notify {
+ SYSTEM_POWER_STATE_NOTIFIER = 0x0,
+};
+
+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 bool 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_warn("SCMI Notifications - Proto:%X - FAIL_ENABLE - evt[%X] - ret:%d\n",
+ SCMI_PROTOCOL_SYSTEM, evt_id, ret);
+
+ return !ret;
+}
+
+static void *scmi_system_fill_custom_report(const struct scmi_handle *handle,
+ u8 evt_id, u64 timestamp,
+ const void *payld, size_t payld_sz,
+ void *report, u32 *src_id)
+{
+ void *rep = NULL;
+
+ switch (evt_id) {
+ case SYSTEM_POWER_STATE_NOTIFIER:
+ {
+ const struct scmi_system_power_state_notifier_payld *p = payld;
+ struct scmi_system_power_state_notifier_report *r = report;
+
+ if (sizeof(*p) != payld_sz)
+ break;
+
+ 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;
+ rep = r;
+ break;
+ }
+ default:
+ break;
+ }
+
+ return rep;
+}
+
+static const struct scmi_event system_events[] = {
+ {
+ .id = SYSTEM_POWER_STATE_NOTIFIER,
+ .max_payld_sz = 12,
+ .max_report_sz =
+ sizeof(struct scmi_system_power_state_notifier_report),
+ },
+};
+
+static const struct scmi_protocol_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, PAGE_SIZE,
+ &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);
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 1ee6f0502565..fc9f0105e6cc 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -295,6 +295,7 @@ struct scmi_handle {
void *sensor_priv;
void *reset_priv;
void *notify_priv;
+ void *system_priv;
};
enum scmi_std_protocol {
@@ -307,6 +308,15 @@ enum scmi_std_protocol {
SCMI_PROTOCOL_RESET = 0x16,
};
+enum scmi_system_events {
+ SCMI_SYSTEM_SHUTDOWN,
+ SCMI_SYSTEM_COLDRESET,
+ SCMI_SYSTEM_WARMRESET,
+ SCMI_SYSTEM_POWERUP,
+ SCMI_SYSTEM_SUSPEND,
+ SCMI_SYSTEM_MAX
+};
+
struct scmi_device {
u32 id;
u8 protocol_id;
@@ -388,6 +398,13 @@ struct scmi_power_state_change_requested_report {
u32 power_state;
};
+struct scmi_system_power_state_notifier_report {
+ u64 timestamp;
+ u32 agent_id;
+ u32 flags;
+ u32 system_state;
+};
+
struct scmi_perf_limits_report {
u64 timestamp;
u32 agent_id;
--
2.17.1
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