@@ -86,6 +86,9 @@ struct udevice *scmi_get_protocol(struct udevice *dev,
case SCMI_PROTOCOL_ID_BASE:
proto = priv->base_dev;
break;
+ case SCMI_PROTOCOL_ID_POWER_DOMAIN:
+ proto = priv->pwdom_dev;
+ break;
case SCMI_PROTOCOL_ID_CLOCK:
proto = priv->clock_dev;
break;
@@ -133,6 +136,9 @@ static int scmi_add_protocol(struct udevice *dev,
case SCMI_PROTOCOL_ID_BASE:
priv->base_dev = proto;
break;
+ case SCMI_PROTOCOL_ID_POWER_DOMAIN:
+ priv->pwdom_dev = proto;
+ break;
case SCMI_PROTOCOL_ID_CLOCK:
priv->clock_dev = proto;
break;
@@ -405,6 +411,11 @@ static int scmi_bind_protocols(struct udevice *dev)
drv = NULL;
name = ofnode_get_name(node);
switch (protocol_id) {
+ case SCMI_PROTOCOL_ID_POWER_DOMAIN:
+ if (CONFIG_IS_ENABLED(SCMI_POWER_DOMAIN) &&
+ scmi_protocol_is_supported(dev, protocol_id))
+ drv = DM_DRIVER_GET(scmi_power_domain);
+ break;
case SCMI_PROTOCOL_ID_CLOCK:
if (CONFIG_IS_ENABLED(CLK_SCMI) &&
scmi_protocol_is_supported(dev, protocol_id))
@@ -83,6 +83,13 @@ config SANDBOX_POWER_DOMAIN
simply accepts requests to power on/off various HW modules without
actually doing anything beyond a little error checking.
+config SCMI_POWER_DOMAIN
+ bool "Enable SCMI power domain driver"
+ depends on POWER_DOMAIN && SCMI_FIRMWARE
+ help
+ Enable power domain implementation based on SCMI power domain
+ management protocol.
+
config TEGRA186_POWER_DOMAIN
bool "Enable Tegra186 BPMP-based power domain driver"
depends on TEGRA186_BPMP
@@ -15,6 +15,7 @@ obj-$(CONFIG_MESON_EE_POWER_DOMAIN) += meson-ee-pwrc.o
obj-$(CONFIG_MESON_SECURE_POWER_DOMAIN) += meson-secure-pwrc.o
obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain.o
obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o
+obj-$(CONFIG_SCMI_POWER_DOMAIN) += scmi-power-domain.o
obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o
obj-$(CONFIG_TI_SCI_POWER_DOMAIN) += ti-sci-power-domain.o
obj-$(CONFIG_TI_POWER_DOMAIN) += ti-power-domain.o
new file mode 100644
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * SCMI Power domain driver
+ *
+ * Copyright (C) 2023 Linaro Limited
+ * author: AKASHI Takahiro <takahiro.akashi@linaro.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <malloc.h>
+#include <power-domain.h>
+#include <power-domain-uclass.h>
+#include <scmi_agent.h>
+#include <scmi_protocols.h>
+#include <dm/device_compat.h>
+
+/**
+ * struct scmi_pwd_properties
+ * @attributes: Power domain attributes
+ * @name: Name of the domain
+ */
+struct scmi_pwd_properties {
+ u32 attributes;
+ u8 *name; /* not used now */
+};
+
+/**
+ * struct scmi_power_domain_priv
+ * @num_pwdoms: Number of power domains
+ * @prop: Pointer to domain's properties
+ * @stats_addr: Address of statistics memory region
+ * @stats_len: Length of statistics memory region
+ */
+struct scmi_power_domain_priv {
+ int num_pwdoms;
+ struct scmi_pwd_properties *prop;
+ u64 stats_addr;
+ size_t stats_len;
+};
+
+/**
+ * async_is_supported - check asynchronous transition
+ * @attributes: Power domain attributes
+ *
+ * Determine if the power transition can be done asynchronously.
+ *
+ * Return: true if supported, false if not
+ */
+static bool async_is_supported(u32 attributes)
+{
+ if (attributes & SCMI_PWD_ATTR_PSTATE_ASYNC)
+ return true;
+
+ /* TODO: check attributes && SCMI_PWD_ATTR_PSTATE_SYNC */
+ return false;
+}
+
+/**
+ * scmi_power_domain_on - Enable the power domain
+ * @power_domain: Power domain
+ *
+ * Turn on the power domain.
+ *
+ * Return: 0 on success, error code on failure
+ */
+static int scmi_power_domain_on(struct power_domain *power_domain)
+{
+ struct scmi_power_domain_priv *priv = dev_get_priv(power_domain->dev);
+ u32 flags, pstate;
+ int ret;
+
+ if (power_domain->id > priv->num_pwdoms)
+ return -EINVAL;
+
+ if (async_is_supported(priv->prop[power_domain->id].attributes))
+ flags = SCMI_PWD_SET_FLAGS_ASYNC;
+ else
+ flags = 0;
+
+ /* ON */
+ pstate = 0;
+
+ ret = scmi_pwd_state_set(power_domain->dev, flags, power_domain->id,
+ pstate);
+ if (ret) {
+ dev_err(power_domain->dev, "failed to set the state on (%d)\n",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * scmi_power_domain_off - Disable the power domain
+ * @power_domain: Power domain
+ *
+ * Turn off the power domain.
+ *
+ * Return: 0 on success, error code on failure
+ */
+static int scmi_power_domain_off(struct power_domain *power_domain)
+{
+ struct scmi_power_domain_priv *priv = dev_get_priv(power_domain->dev);
+ u32 flags, pstate;
+ int ret;
+
+ if (power_domain->id > priv->num_pwdoms)
+ return -EINVAL;
+
+ if (async_is_supported(priv->prop[power_domain->id].attributes))
+ flags = SCMI_PWD_SET_FLAGS_ASYNC;
+ else
+ flags = 0;
+
+ /* OFF */
+ pstate = SCMI_PWD_PSTATE_TYPE_LOST;
+
+ ret = scmi_pwd_state_set(power_domain->dev, flags, power_domain->id,
+ pstate);
+ if (ret) {
+ dev_err(power_domain->dev, "failed to set the state off (%d)\n",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * scmi_power_domain_probe - Probe the power domain
+ * @dev: Power domain device
+ *
+ * Probe the power domain and initialize the properties.
+ *
+ * Return: 0 on success, error code on failure
+ */
+static int scmi_power_domain_probe(struct udevice *dev)
+{
+ struct scmi_power_domain_priv *priv = dev_get_priv(dev);
+ u32 version;
+ int i, ret;
+
+ ret = devm_scmi_of_get_channel(dev);
+ if (ret) {
+ dev_err(dev, "failed to get channel (%d)\n", ret);
+ return ret;
+ }
+
+ ret = scmi_generic_protocol_version(dev, SCMI_PROTOCOL_ID_POWER_DOMAIN,
+ &version);
+
+ ret = scmi_pwd_protocol_attrs(dev, &priv->num_pwdoms, &priv->stats_addr,
+ &priv->stats_len);
+ if (ret) {
+ dev_err(dev, "failed to get protocol attributes (%d)\n", ret);
+ return ret;
+ }
+
+ priv->prop = calloc(sizeof(*priv->prop), priv->num_pwdoms);
+ if (!priv->prop)
+ return -ENOMEM;
+
+ for (i = 0; i < priv->num_pwdoms; i++) {
+ ret = scmi_pwd_attrs(dev, i, &priv->prop[i].attributes,
+ &priv->prop[i].name);
+ if (ret) {
+ dev_err(dev, "failed to get attributes pwd:%d (%d)\n",
+ i, ret);
+ for (i--; i >= 0; i--)
+ free(priv->prop[i].name);
+ free(priv->prop);
+
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+struct power_domain_ops scmi_power_domain_ops = {
+ .on = scmi_power_domain_on,
+ .off = scmi_power_domain_off,
+};
+
+U_BOOT_DRIVER(scmi_power_domain) = {
+ .name = "scmi_power_domain",
+ .id = UCLASS_POWER_DOMAIN,
+ .ops = &scmi_power_domain_ops,
+ .probe = scmi_power_domain_probe,
+ .priv_auto = sizeof(struct scmi_power_domain_priv),
+};
@@ -23,6 +23,7 @@ struct scmi_channel;
* @agent_name: Agent name
* @agent_id: Identifier of agent
* @base_dev: SCMI base protocol device
+ * @pwdom_dev: SCMI power domain management protocol device
* @clock_dev: SCMI clock protocol device
* @resetdom_dev: SCMI reset domain protocol device
* @voltagedom_dev: SCMI voltage domain protocol device
@@ -38,6 +39,7 @@ struct scmi_agent_priv {
u8 *agent_name;
u32 agent_id;
struct udevice *base_dev;
+ struct udevice *pwdom_dev;
struct udevice *clock_dev;
struct udevice *resetdom_dev;
struct udevice *voltagedom_dev;
Add power domain driver based on SCMI power domain management protocol. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> --- v2 * remove tentative code which was enclosed by "#if 0" * free allocated memory at the failure of probe function --- drivers/firmware/scmi/scmi_agent-uclass.c | 11 ++ drivers/power/domain/Kconfig | 7 + drivers/power/domain/Makefile | 1 + drivers/power/domain/scmi-power-domain.c | 193 ++++++++++++++++++++++ include/scmi_agent-uclass.h | 2 + 5 files changed, 214 insertions(+) create mode 100644 drivers/power/domain/scmi-power-domain.c