power: domain: add SCMI driver

Add power domain driver based on SCMI power domain management protocol.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>

diff --git a/drivers/firmware/scmi/scmi_agent-uclass.c b/drivers/firmware/scmi/scmi_agent-uclass.c
index 6f585b96f740bd32a0c0f1ac4d29d17f9a8cd313..0f1003e167e6ba207c0eb93540b0508e6f3083d6 100644 (file)
--- a/drivers/firmware/scmi/scmi_agent-uclass.c
+++ b/drivers/firmware/scmi/scmi_agent-uclass.c
@@ -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))

diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
index 411c210756a3929a806b048f99a3b370a711dd56..bd82d2f7044b3c3f8c88dea27c39193efedb4c84 100644 (file)
--- a/drivers/power/domain/Kconfig
+++ b/drivers/power/domain/Kconfig
@@ -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

diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile
index aa5a4ba57cd8ada7c49bf3f92b0c55d40c60fb29..2daab73eb758962fe9c11108834c1778497894de 100644 (file)
--- a/drivers/power/domain/Makefile
+++ b/drivers/power/domain/Makefile
@@ -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

diff --git a/drivers/power/domain/scmi-power-domain.c b/drivers/power/domain/scmi-power-domain.c
new file mode 100644 (file)
index 0000000..3cd0f07
--- /dev/null
+++ b/drivers/power/domain/scmi-power-domain.c
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * SCMI Power domain driver
+ *
+ * Copyright (C) 2023 Linaro Limited
+ *              author: AKASHI Takahiro <takahiro.akashi@linaro.org>
+ */
+
+#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),
+};

diff --git a/include/scmi_agent-uclass.h b/include/scmi_agent-uclass.h
index 35d96069645ebd4db2193e85c4b951a3b2aa0a56..33e0e18c30d4ae4ddaaa2cb3830c03cd7a559cc0 100644 (file)
--- a/include/scmi_agent-uclass.h
+++ b/include/scmi_agent-uclass.h
@@ -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;