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authorCristian Marussi <cristian.marussi@arm.com>2020-09-07 19:46:55 +0200
committerSudeep Holla <sudeep.holla@arm.com>2020-09-08 17:00:55 +0200
commita8803055127afb87640974adedac60435592b86d (patch)
treeed407fca6c7e362f569107ce84849c7780a2bde9 /drivers/firmware
parentfirmware: arm_scmi: Constify static scmi-ops (diff)
downloadlinux-a8803055127afb87640974adedac60435592b86d.tar.xz
linux-a8803055127afb87640974adedac60435592b86d.zip
firmware: arm_scmi: Add system power protocol support
Add bare protocol support for SCMI system power protocol 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.. Link: https://lore.kernel.org/r/20200907174657.32466-2-cristian.marussi@arm.com Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/arm_scmi/Makefile2
-rw-r--r--drivers/firmware/arm_scmi/system.c136
2 files changed, 137 insertions, 1 deletions
diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
index 6f9cbc4aef22..643f2320f976 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_DISCOVERY) += 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..aa1e74f066a0
--- /dev/null
+++ b/drivers/firmware/arm_scmi/system.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Control and Management Interface (SCMI) System Power Protocol
+ *
+ * Copyright (C) 2020 ARM Ltd.
+ */
+
+#define pr_fmt(fmt) "SCMI Notifications SYSTEM - " fmt
+
+#include <linux/scmi_protocol.h>
+
+#include "common.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;
+};
+
+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 int 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_debug("FAIL_ENABLE - evt[%X] - ret:%d\n", evt_id, ret);
+
+ return ret;
+}
+
+static void *scmi_system_fill_custom_report(const struct scmi_handle *handle,
+ u8 evt_id, ktime_t timestamp,
+ const void *payld, size_t payld_sz,
+ void *report, u32 *src_id)
+{
+ const struct scmi_system_power_state_notifier_payld *p = payld;
+ struct scmi_system_power_state_notifier_report *r = report;
+
+ if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER ||
+ sizeof(*p) != payld_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);
+ *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 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, SCMI_PROTO_QUEUE_SZ,
+ &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);