On 12/24/21 6:34 AM, Mark Kettenis wrote:
This driver supports power domains for the power management controller found on Apple SoCs.
Signed-off-by: Mark Kettenis kettenis@openbsd.org
Reviewed-by: Jaehoon Chung jh80.chung@samsung.com
Best Regards, Jaehoon Chung
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 viaMMIO 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),
+};