Add power domain driver based on SCMI power domain management protocol.
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org --- 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 | 197 ++++++++++++++++++++++ include/scmi_agent-uclass.h | 2 + 5 files changed, 218 insertions(+) create mode 100644 drivers/power/domain/scmi-power-domain.c
diff --git a/drivers/firmware/scmi/scmi_agent-uclass.c b/drivers/firmware/scmi/scmi_agent-uclass.c index 6f585b96f740..0f1003e167e6 100644 --- 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 411c210756a3..bd82d2f7044b 100644 --- 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 aa5a4ba57cd8..2daab73eb758 100644 --- 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 index 000000000000..5ea9ff889231 --- /dev/null +++ b/drivers/power/domain/scmi-power-domain.c @@ -0,0 +1,197 @@ +// 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); +#if 0 /* TODO */ + if (ret || version < SCMI_POWER_DOMAIN_PROTOCOL_VERSION) { + dev_err(dev, "protocol version doesn't match (%d)\n", version); + return -EINVAL; + } +#endif + + 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); + /* TODO: clean up */ + + 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 35d96069645e..33e0e18c30d4 100644 --- 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;