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Message-Id: <20201014150545.44807-10-cristian.marussi@arm.com>
Date: Wed, 14 Oct 2020 16:05:43 +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,
f.fainelli@...il.com, etienne.carriere@...aro.org,
thara.gopinath@...aro.org, vincent.guittot@...aro.org,
souvik.chakravarty@....com, cristian.marussi@....com
Subject: [PATCH 09/11] [DEBUG] firmware: arm_scmi: add example SCMI driver for custom protocol
Add an example SCMI driver using custom vendor protocol 0x99 and also
registering for Performance protocol notifications.
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
drivers/firmware/Kconfig | 7 +
drivers/firmware/arm_scmi/Makefile | 2 +
drivers/firmware/arm_scmi/scmi_custom_dummy.c | 126 ++++++++++++++++++
3 files changed, 135 insertions(+)
create mode 100644 drivers/firmware/arm_scmi/scmi_custom_dummy.c
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 75e2668a6490..d209df6fd3ee 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -48,6 +48,13 @@ config ARM_SCMI_POWER_DOMAIN
will be called scmi_pm_domain. Note this may needed early in boot
before rootfs may be available.
+config ARM_SCMI_CUSTOM_DUMMY
+ tristate "SCMI Custom Dummy driver"
+ depends on ARM_SCMI_PROTOCOL_CUSTOM || (COMPILE_TEST && OF)
+ default n
+ help
+ Custom Dummy driver
+
config ARM_SCPI_PROTOCOL
tristate "ARM System Control and Power Interface (SCPI) Message Protocol"
depends on ARM || ARM64 || COMPILE_TEST
diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
index 0a03b7432497..361ede03cdb5 100644
--- a/drivers/firmware/arm_scmi/Makefile
+++ b/drivers/firmware/arm_scmi/Makefile
@@ -12,3 +12,5 @@ obj-$(CONFIG_ARM_SCMI_PROTOCOL_CUSTOM) += scmi_custom.o
obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-module.o
obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o
+
+obj-$(CONFIG_ARM_SCMI_CUSTOM_DUMMY) += scmi_custom_dummy.o
diff --git a/drivers/firmware/arm_scmi/scmi_custom_dummy.c b/drivers/firmware/arm_scmi/scmi_custom_dummy.c
new file mode 100644
index 000000000000..28fd3595a690
--- /dev/null
+++ b/drivers/firmware/arm_scmi/scmi_custom_dummy.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *
+ * Copyright (C) 2018-2020 ARM Ltd.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/pm_domain.h>
+#include <linux/scmi_protocol.h>
+
+static const struct scmi_dummy_ops *dummy_ops;
+
+static int dummy_custom_perf_cb(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct scmi_perf_level_report *er = data;
+
+ pr_info("%s()::%d - EVENT:[%ld] - TS:%lld DOMAIN_ID:%d AGENT_ID:%d LEVEL:%d\n",
+ __func__, __LINE__, event, er->timestamp, er->domain_id,
+ er->agent_id, er->performance_level);
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block dummy_custom_perf_nb = {
+ .notifier_call = dummy_custom_perf_cb,
+ .priority = 10,
+};
+
+static int custom_dummy_scream_cb(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct scmi_dummy_scream_report *er = data;
+
+ pr_info("%s()::%d - EVENT:[%ld] - TS:%lld DOMAIN_ID:%d AGENT_ID:%d LEVEL:%d\n",
+ __func__, __LINE__, event, er->timestamp, er->domain_id,
+ er->agent_id, er->scream);
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block custom_dummy_nb = {
+ .notifier_call = custom_dummy_scream_cb,
+ .priority = 10,
+};
+
+static int scmi_dummy_probe(struct scmi_device *sdev)
+{
+ int num_domains;
+ struct device *dev = &sdev->dev;
+ const struct scmi_handle *handle = sdev->handle;
+ u32 src_id;
+
+ if (!handle)
+ return -ENODEV;
+
+ dummy_ops = handle->get_ops(handle, SCMI_PROTOCOL_CUSTOM_DUMMY);
+ if (IS_ERR(dummy_ops))
+ return PTR_ERR(dummy_ops);
+
+ num_domains = dummy_ops->num_domains_get(handle);
+ if (num_domains < 0) {
+ dev_err(dev, "number of domains not found\n");
+ return num_domains;
+ }
+
+ pr_info("Registering notify_callback as CUSTOM_DUMMY !!\n");
+
+ src_id = 0x02;
+ handle->notify_ops->register_event_notifier(handle,
+ SCMI_PROTOCOL_CUSTOM_DUMMY,
+ SCMI_EVENT_DUMMY_SCREAM,
+ &src_id, &custom_dummy_nb);
+
+ src_id = 0x01;
+ handle->notify_ops->register_event_notifier(handle,
+ SCMI_PROTOCOL_PERF,
+ SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED,
+ &src_id,
+ &dummy_custom_perf_nb);
+
+ return 0;
+}
+
+static void scmi_dummy_remove(struct scmi_device *sdev)
+{
+ const struct scmi_handle *handle = sdev->handle;
+ u32 src_id;
+
+ src_id = 0x02;
+ handle->notify_ops->unregister_event_notifier(handle,
+ SCMI_PROTOCOL_CUSTOM_DUMMY,
+ SCMI_EVENT_DUMMY_SCREAM,
+ &src_id, &custom_dummy_nb);
+
+ src_id = 0x01;
+ handle->notify_ops->unregister_event_notifier(handle,
+ SCMI_PROTOCOL_PERF,
+ SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED,
+ &src_id,
+ &dummy_custom_perf_nb);
+
+ handle->put_ops(handle, SCMI_PROTOCOL_CUSTOM_DUMMY);
+
+ return;
+}
+
+static const struct scmi_device_id scmi_id_table[] = {
+ { SCMI_PROTOCOL_CUSTOM_DUMMY, "custom_dummy" },
+ { },
+};
+MODULE_DEVICE_TABLE(scmi, scmi_id_table);
+
+static struct scmi_driver scmi_custom_dummy_driver = {
+ .name = "scmi-custom-dummy",
+ .probe = scmi_dummy_probe,
+ .remove = scmi_dummy_remove,
+ .id_table = scmi_id_table,
+};
+module_scmi_driver(scmi_custom_dummy_driver);
+
+MODULE_AUTHOR("DummyMaster");
+MODULE_DESCRIPTION("ARM SCMI Custom Dummy driver");
+MODULE_LICENSE("GPL v2");
--
2.17.1
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