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Subject[PATCH v3 17/22][UPDATE] firmware: arm_scmi: add device power domain support genpd
Date
This patch hooks up the support for device power domain provided by
SCMI using the Linux generic power domain infrastructure.

Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
drivers/firmware/Kconfig | 13 +++
drivers/firmware/arm_scmi/Makefile | 1 +
drivers/firmware/arm_scmi/scmi_pm_domain.c | 136 +++++++++++++++++++++++++++++
3 files changed, 150 insertions(+)
create mode 100644 drivers/firmware/arm_scmi/scmi_pm_domain.c

- updated to read the initial state instead of assuming off as
suggested by Ulf

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index c3d1a12763ce..a4462bc661c8 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -40,6 +40,19 @@ config ARM_SCMI_PROTOCOL
This protocol library provides interface for all the client drivers
making use of the features offered by the SCMI.

+config ARM_SCMI_POWER_DOMAIN
+ tristate "SCMI power domain driver"
+ depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF)
+ default y
+ select PM_GENERIC_DOMAINS if PM
+ help
+ This enables support for the SCMI 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 scmi_pm_domain. Note this may needed early in boot
+ before rootfs may be available.
+
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 7fb026c71833..289e9e5a4764 100644
--- a/drivers/firmware/arm_scmi/Makefile
+++ b/drivers/firmware/arm_scmi/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_ARM_SCMI_PROTOCOL) = arm_scmi.o
arm_scmi-y = base.o clock.o driver.o mbox_if.o perf.o power.o sensors.o
arm_scmi-$(CONFIG_ARM_MHU) += arm_mhu_if.o
+obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o
diff --git a/drivers/firmware/arm_scmi/scmi_pm_domain.c b/drivers/firmware/arm_scmi/scmi_pm_domain.c
new file mode 100644
index 000000000000..f105f7d5c660
--- /dev/null
+++ b/drivers/firmware/arm_scmi/scmi_pm_domain.c
@@ -0,0 +1,136 @@
+/*
+ * SCMI Generic power domain support.
+ *
+ * Copyright (C) 2017 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/pm_domain.h>
+#include <linux/scmi_protocol.h>
+
+struct scmi_pm_domain {
+ struct generic_pm_domain genpd;
+ const struct scmi_handle *handle;
+ const char *name;
+ u32 domain;
+};
+
+#define to_scmi_pd(gpd) container_of(gpd, struct scmi_pm_domain, genpd)
+
+static int scmi_pd_power(struct generic_pm_domain *domain, bool power_on)
+{
+ int ret;
+ u32 state, ret_state;
+ struct scmi_pm_domain *pd = to_scmi_pd(domain);
+ const struct scmi_power_ops *ops = pd->handle->power_ops;
+
+ if (power_on)
+ state = SCMI_POWER_STATE_GENERIC_ON;
+ else
+ state = SCMI_POWER_STATE_GENERIC_OFF;
+
+ ret = ops->state_set(pd->handle, pd->domain, state);
+ if (!ret)
+ ret = ops->state_get(pd->handle, pd->domain, &ret_state);
+ if (!ret && state != ret_state)
+ return -EIO;
+
+ return ret;
+}
+
+static int scmi_pd_power_on(struct generic_pm_domain *domain)
+{
+ return scmi_pd_power(domain, true);
+}
+
+static int scmi_pd_power_off(struct generic_pm_domain *domain)
+{
+ return scmi_pd_power(domain, false);
+}
+
+static int scmi_pm_domain_probe(struct platform_device *pdev)
+{
+ int num_domains, i;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct scmi_pm_domain *scmi_pd;
+ struct genpd_onecell_data *scmi_pd_data;
+ struct generic_pm_domain **domains;
+ const struct scmi_handle *handle = devm_scmi_handle_get(dev);
+
+ if (IS_ERR_OR_NULL(handle) || !handle->power_ops)
+ return -EPROBE_DEFER;
+
+ num_domains = handle->power_ops->num_domains_get(handle);
+ if (num_domains < 0) {
+ dev_err(dev, "number of domains not found\n");
+ return num_domains;
+ }
+
+ scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL);
+ if (!scmi_pd)
+ return -ENOMEM;
+
+ scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL);
+ if (!scmi_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++, scmi_pd++) {
+ u32 state;
+
+ domains[i] = &scmi_pd->genpd;
+
+ scmi_pd->domain = i;
+ scmi_pd->handle = handle;
+ scmi_pd->name = handle->power_ops->name_get(handle, i);
+ scmi_pd->genpd.name = scmi_pd->name;
+ scmi_pd->genpd.power_off = scmi_pd_power_off;
+ scmi_pd->genpd.power_on = scmi_pd_power_on;
+
+ if (handle->power_ops->state_get(handle, i, &state)) {
+ dev_dbg(dev, "failed to get state for domain %d\n", i);
+ continue;
+ }
+
+ pm_genpd_init(&scmi_pd->genpd, NULL,
+ state == SCMI_POWER_STATE_GENERIC_OFF);
+ }
+
+ scmi_pd_data->domains = domains;
+ scmi_pd_data->num_domains = num_domains;
+
+ of_genpd_add_provider_onecell(np, scmi_pd_data);
+
+ return 0;
+}
+
+static struct platform_driver scmi_power_domain_driver = {
+ .driver = {
+ .name = "scmi-power-domain",
+ },
+ .probe = scmi_pm_domain_probe,
+};
+module_platform_driver(scmi_power_domain_driver);
+
+MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
+MODULE_DESCRIPTION("ARM SCMI power domain driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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