This driver supports power domains for the power management controller found on Apple SoCs.
Signed-off-by: Mark Kettenis kettenis@openbsd.org --- arch/arm/Kconfig | 3 + drivers/power/domain/Kconfig | 8 +++ drivers/power/domain/Makefile | 1 + drivers/power/domain/apple-pmgr.c | 113 ++++++++++++++++++++++++++++++ 4 files changed, 125 insertions(+) create mode 100644 drivers/power/domain/apple-pmgr.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 59e031de04..40d3f66acb 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -938,6 +938,9 @@ config ARCH_APPLE select OF_BOARD select PINCTRL select POSITION_INDEPENDENT + select POWER_DOMAIN + select REGMAP + select SYSCON select SYSRESET select SYSRESET_WATCHDOG select SYSRESET_WATCHDOG_AUTO diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig index 99b3f9ae71..6ef7a3b3a7 100644 --- a/drivers/power/domain/Kconfig +++ b/drivers/power/domain/Kconfig @@ -9,6 +9,14 @@ config POWER_DOMAIN domains). This may be used to save power. This API provides the means to control such power management hardware.
+config APPLE_PMGR_POWER_DOMAIN + bool "Enable the Apple PMGR power domain driver" + depends on POWER_DOMAIN + default y if ARCH_APPLE + help + Enable support for manipulating the Apple M1 power domains via + MMIO mapped registers. + config BCM6328_POWER_DOMAIN bool "Enable the BCM6328 power domain driver" depends on POWER_DOMAIN && ARCH_BMIPS diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile index 3d1e5f073c..530ae35671 100644 --- a/drivers/power/domain/Makefile +++ b/drivers/power/domain/Makefile @@ -4,6 +4,7 @@ #
obj-$(CONFIG_$(SPL_)POWER_DOMAIN) += power-domain-uclass.o +obj-$(CONFIG_APPLE_PMGR_POWER_DOMAIN) += apple-pmgr.o obj-$(CONFIG_BCM6328_POWER_DOMAIN) += bcm6328-power-domain.o obj-$(CONFIG_IMX8_POWER_DOMAIN) += imx8-power-domain-legacy.o imx8-power-domain.o obj-$(CONFIG_IMX8M_POWER_DOMAIN) += imx8m-power-domain.o diff --git a/drivers/power/domain/apple-pmgr.c b/drivers/power/domain/apple-pmgr.c new file mode 100644 index 0000000000..08a30c8ebf --- /dev/null +++ b/drivers/power/domain/apple-pmgr.c @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2021 Mark Kettenis kettenis@openbsd.org + */ + +#include <common.h> +#include <asm/io.h> +#include <dm.h> +#include <linux/err.h> +#include <linux/bitfield.h> +#include <power-domain-uclass.h> +#include <regmap.h> +#include <syscon.h> + +#define APPLE_PMGR_PS_TARGET GENMASK(3, 0) +#define APPLE_PMGR_PS_ACTUAL GENMASK(7, 4) + +#define APPLE_PMGR_PS_ACTIVE 0xf +#define APPLE_PMGR_PS_PWRGATE 0x0 + +#define APPLE_PMGR_PS_SET_TIMEOUT 100 + +struct apple_pmgr_priv { + struct regmap *regmap; + u32 offset; +}; + +static int apple_pmgr_request(struct power_domain *power_domain) +{ + return 0; +} + +static int apple_pmgr_rfree(struct power_domain *power_domain) +{ + return 0; +} + +static int apple_pmgr_ps_set(struct power_domain *power_domain, u32 pstate) +{ + struct apple_pmgr_priv *priv = dev_get_priv(power_domain->dev); + uint reg; + + regmap_update_bits(priv->regmap, priv->offset, APPLE_PMGR_PS_TARGET, + FIELD_PREP(APPLE_PMGR_PS_TARGET, pstate)); + + return regmap_read_poll_timeout( + priv->regmap, priv->offset, reg, + (FIELD_GET(APPLE_PMGR_PS_ACTUAL, reg) == pstate), 1, + APPLE_PMGR_PS_SET_TIMEOUT); +} + +static int apple_pmgr_on(struct power_domain *power_domain) +{ + return apple_pmgr_ps_set(power_domain, APPLE_PMGR_PS_ACTIVE); +} + +static int apple_pmgr_off(struct power_domain *power_domain) +{ + return 0; +} + +static int apple_pmgr_of_xlate(struct power_domain *power_domain, + struct ofnode_phandle_args *args) +{ + if (args->args_count != 0) { + debug("Invalid args_count: %d\n", args->args_count); + return -EINVAL; + } + + return 0; +} + +static const struct udevice_id apple_pmgr_ids[] = { + { .compatible = "apple,pmgr-pwrstate" }, + { /* sentinel */ } +}; + +static int apple_pmgr_probe(struct udevice *dev) +{ + struct apple_pmgr_priv *priv = dev_get_priv(dev); + int ret; + + ret = dev_power_domain_on(dev); + if (ret) + return ret; + + priv->regmap = syscon_get_regmap(dev->parent); + if (IS_ERR(priv->regmap)) + return PTR_ERR(priv->regmap); + + ret = dev_read_u32(dev, "reg", &priv->offset); + if (ret < 0) + return ret; + + return 0; +} + +struct power_domain_ops apple_pmgr_ops = { + .request = apple_pmgr_request, + .rfree = apple_pmgr_rfree, + .on = apple_pmgr_on, + .off = apple_pmgr_off, + .of_xlate = apple_pmgr_of_xlate, +}; + +U_BOOT_DRIVER(apple_pmgr) = { + .name = "apple_pmgr", + .id = UCLASS_POWER_DOMAIN, + .of_match = apple_pmgr_ids, + .ops = &apple_pmgr_ops, + .probe = apple_pmgr_probe, + .priv_auto = sizeof(struct apple_pmgr_priv), +};