This protocol library provides interface for all the client drivers
making use of the features offered by the SCP.
-config ARM_SCPI_POWER_DOMAIN
- tristate "SCPI power domain driver"
- depends on ARM_SCPI_PROTOCOL || (COMPILE_TEST && OF)
- default y
- select PM_GENERIC_DOMAINS if PM
- help
- This enables support for the SCPI power domains which can be
- enabled or disabled via the SCP firmware
-
config ARM_SDE_INTERFACE
bool "ARM Software Delegated Exception Interface (SDEI)"
depends on ARM64
# Makefile for the linux kernel.
#
obj-$(CONFIG_ARM_SCPI_PROTOCOL) += arm_scpi.o
-obj-$(CONFIG_ARM_SCPI_POWER_DOMAIN) += scpi_pm_domain.o
obj-$(CONFIG_ARM_SDE_INTERFACE) += arm_sdei.o
obj-$(CONFIG_DMI) += dmi_scan.o
obj-$(CONFIG_DMI_SYSFS) += dmi-sysfs.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * SCPI Generic power domain support.
- *
- * Copyright (C) 2016 ARM Ltd.
- */
-
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/pm_domain.h>
-#include <linux/scpi_protocol.h>
-
-struct scpi_pm_domain {
- struct generic_pm_domain genpd;
- struct scpi_ops *ops;
- u32 domain;
-};
-
-/*
- * These device power state values are not well-defined in the specification.
- * In case, different implementations use different values, we can make these
- * specific to compatibles rather than getting these values from device tree.
- */
-enum scpi_power_domain_state {
- SCPI_PD_STATE_ON = 0,
- SCPI_PD_STATE_OFF = 3,
-};
-
-#define to_scpi_pd(gpd) container_of(gpd, struct scpi_pm_domain, genpd)
-
-static int scpi_pd_power(struct scpi_pm_domain *pd, bool power_on)
-{
- int ret;
- enum scpi_power_domain_state state;
-
- if (power_on)
- state = SCPI_PD_STATE_ON;
- else
- state = SCPI_PD_STATE_OFF;
-
- ret = pd->ops->device_set_power_state(pd->domain, state);
- if (ret)
- return ret;
-
- return !(state == pd->ops->device_get_power_state(pd->domain));
-}
-
-static int scpi_pd_power_on(struct generic_pm_domain *domain)
-{
- struct scpi_pm_domain *pd = to_scpi_pd(domain);
-
- return scpi_pd_power(pd, true);
-}
-
-static int scpi_pd_power_off(struct generic_pm_domain *domain)
-{
- struct scpi_pm_domain *pd = to_scpi_pd(domain);
-
- return scpi_pd_power(pd, false);
-}
-
-static int scpi_pm_domain_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct device_node *np = dev->of_node;
- struct scpi_pm_domain *scpi_pd;
- struct genpd_onecell_data *scpi_pd_data;
- struct generic_pm_domain **domains;
- struct scpi_ops *scpi_ops;
- int ret, num_domains, i;
-
- scpi_ops = get_scpi_ops();
- if (!scpi_ops)
- return -EPROBE_DEFER;
-
- if (!np) {
- dev_err(dev, "device tree node not found\n");
- return -ENODEV;
- }
-
- if (!scpi_ops->device_set_power_state ||
- !scpi_ops->device_get_power_state) {
- dev_err(dev, "power domains not supported in the firmware\n");
- return -ENODEV;
- }
-
- ret = of_property_read_u32(np, "num-domains", &num_domains);
- if (ret) {
- dev_err(dev, "number of domains not found\n");
- return -EINVAL;
- }
-
- scpi_pd = devm_kcalloc(dev, num_domains, sizeof(*scpi_pd), GFP_KERNEL);
- if (!scpi_pd)
- return -ENOMEM;
-
- scpi_pd_data = devm_kzalloc(dev, sizeof(*scpi_pd_data), GFP_KERNEL);
- if (!scpi_pd_data)
- return -ENOMEM;
-
- domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL);
- if (!domains)
- return -ENOMEM;
-
- for (i = 0; i < num_domains; i++, scpi_pd++) {
- domains[i] = &scpi_pd->genpd;
-
- scpi_pd->domain = i;
- scpi_pd->ops = scpi_ops;
- scpi_pd->genpd.name = devm_kasprintf(dev, GFP_KERNEL,
- "%pOFn.%d", np, i);
- if (!scpi_pd->genpd.name) {
- dev_err(dev, "Failed to allocate genpd name:%pOFn.%d\n",
- np, i);
- continue;
- }
- scpi_pd->genpd.power_off = scpi_pd_power_off;
- scpi_pd->genpd.power_on = scpi_pd_power_on;
-
- /*
- * Treat all power domains as off at boot.
- *
- * The SCP firmware itself may have switched on some domains,
- * but for reference counting purpose, keep it this way.
- */
- pm_genpd_init(&scpi_pd->genpd, NULL, true);
- }
-
- scpi_pd_data->domains = domains;
- scpi_pd_data->num_domains = num_domains;
-
- of_genpd_add_provider_onecell(np, scpi_pd_data);
-
- return 0;
-}
-
-static const struct of_device_id scpi_power_domain_ids[] = {
- { .compatible = "arm,scpi-power-domains", },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, scpi_power_domain_ids);
-
-static struct platform_driver scpi_power_domain_driver = {
- .driver = {
- .name = "scpi_power_domain",
- .of_match_table = scpi_power_domain_ids,
- },
- .probe = scpi_pm_domain_probe,
-};
-module_platform_driver(scpi_power_domain_driver);
-
-MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
-MODULE_DESCRIPTION("ARM SCPI power domain driver");
-MODULE_LICENSE("GPL v2");
This driver can also be built as a module. If so, the module
will be called scmi_pm_domain. Note this may needed early in boot
before rootfs may be available.
+
+config ARM_SCPI_POWER_DOMAIN
+ tristate "SCPI power domain driver"
+ depends on ARM_SCPI_PROTOCOL || (COMPILE_TEST && OF)
+ default y
+ select PM_GENERIC_DOMAINS if PM
+ help
+ This enables support for the SCPI power domains which can be
+ enabled or disabled via the SCP firmware
+
+ This driver can also be built as a module. If so, the module will be
+ called scpi_pm_domain.
obj-$(CONFIG_ARM_SCMI_PERF_DOMAIN) += scmi_perf_domain.o
obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o
+obj-$(CONFIG_ARM_SCPI_POWER_DOMAIN) += scpi_pm_domain.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SCPI Generic power domain support.
+ *
+ * Copyright (C) 2016 ARM Ltd.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/scpi_protocol.h>
+
+struct scpi_pm_domain {
+ struct generic_pm_domain genpd;
+ struct scpi_ops *ops;
+ u32 domain;
+};
+
+/*
+ * These device power state values are not well-defined in the specification.
+ * In case, different implementations use different values, we can make these
+ * specific to compatibles rather than getting these values from device tree.
+ */
+enum scpi_power_domain_state {
+ SCPI_PD_STATE_ON = 0,
+ SCPI_PD_STATE_OFF = 3,
+};
+
+#define to_scpi_pd(gpd) container_of(gpd, struct scpi_pm_domain, genpd)
+
+static int scpi_pd_power(struct scpi_pm_domain *pd, bool power_on)
+{
+ int ret;
+ enum scpi_power_domain_state state;
+
+ if (power_on)
+ state = SCPI_PD_STATE_ON;
+ else
+ state = SCPI_PD_STATE_OFF;
+
+ ret = pd->ops->device_set_power_state(pd->domain, state);
+ if (ret)
+ return ret;
+
+ return !(state == pd->ops->device_get_power_state(pd->domain));
+}
+
+static int scpi_pd_power_on(struct generic_pm_domain *domain)
+{
+ struct scpi_pm_domain *pd = to_scpi_pd(domain);
+
+ return scpi_pd_power(pd, true);
+}
+
+static int scpi_pd_power_off(struct generic_pm_domain *domain)
+{
+ struct scpi_pm_domain *pd = to_scpi_pd(domain);
+
+ return scpi_pd_power(pd, false);
+}
+
+static int scpi_pm_domain_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct scpi_pm_domain *scpi_pd;
+ struct genpd_onecell_data *scpi_pd_data;
+ struct generic_pm_domain **domains;
+ struct scpi_ops *scpi_ops;
+ int ret, num_domains, i;
+
+ scpi_ops = get_scpi_ops();
+ if (!scpi_ops)
+ return -EPROBE_DEFER;
+
+ if (!np) {
+ dev_err(dev, "device tree node not found\n");
+ return -ENODEV;
+ }
+
+ if (!scpi_ops->device_set_power_state ||
+ !scpi_ops->device_get_power_state) {
+ dev_err(dev, "power domains not supported in the firmware\n");
+ return -ENODEV;
+ }
+
+ ret = of_property_read_u32(np, "num-domains", &num_domains);
+ if (ret) {
+ dev_err(dev, "number of domains not found\n");
+ return -EINVAL;
+ }
+
+ scpi_pd = devm_kcalloc(dev, num_domains, sizeof(*scpi_pd), GFP_KERNEL);
+ if (!scpi_pd)
+ return -ENOMEM;
+
+ scpi_pd_data = devm_kzalloc(dev, sizeof(*scpi_pd_data), GFP_KERNEL);
+ if (!scpi_pd_data)
+ return -ENOMEM;
+
+ domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL);
+ if (!domains)
+ return -ENOMEM;
+
+ for (i = 0; i < num_domains; i++, scpi_pd++) {
+ domains[i] = &scpi_pd->genpd;
+
+ scpi_pd->domain = i;
+ scpi_pd->ops = scpi_ops;
+ scpi_pd->genpd.name = devm_kasprintf(dev, GFP_KERNEL,
+ "%pOFn.%d", np, i);
+ if (!scpi_pd->genpd.name) {
+ dev_err(dev, "Failed to allocate genpd name:%pOFn.%d\n",
+ np, i);
+ continue;
+ }
+ scpi_pd->genpd.power_off = scpi_pd_power_off;
+ scpi_pd->genpd.power_on = scpi_pd_power_on;
+
+ /*
+ * Treat all power domains as off at boot.
+ *
+ * The SCP firmware itself may have switched on some domains,
+ * but for reference counting purpose, keep it this way.
+ */
+ pm_genpd_init(&scpi_pd->genpd, NULL, true);
+ }
+
+ scpi_pd_data->domains = domains;
+ scpi_pd_data->num_domains = num_domains;
+
+ of_genpd_add_provider_onecell(np, scpi_pd_data);
+
+ return 0;
+}
+
+static const struct of_device_id scpi_power_domain_ids[] = {
+ { .compatible = "arm,scpi-power-domains", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, scpi_power_domain_ids);
+
+static struct platform_driver scpi_power_domain_driver = {
+ .driver = {
+ .name = "scpi_power_domain",
+ .of_match_table = scpi_power_domain_ids,
+ },
+ .probe = scpi_pm_domain_probe,
+};
+module_platform_driver(scpi_power_domain_driver);
+
+MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
+MODULE_DESCRIPTION("ARM SCPI power domain driver");
+MODULE_LICENSE("GPL v2");
projects / linux-block.git / commitdiff