diff options
| -rw-r--r-- | doc/device-tree-bindings/power/ti,sci-pm-domain.txt | 52 | ||||
| -rw-r--r-- | drivers/power/domain/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/power/domain/Makefile | 1 | ||||
| -rw-r--r-- | drivers/power/domain/ti-sci-power-domain.c | 107 |
4 files changed, 167 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/power/ti,sci-pm-domain.txt b/doc/device-tree-bindings/power/ti,sci-pm-domain.txt new file mode 100644 index 0000000..0e190e2 --- /dev/null +++ b/doc/device-tree-bindings/power/ti,sci-pm-domain.txt @@ -0,0 +1,52 @@ +Texas Instruments TI SCI Generic Power Domain +============================================= + +Some TI SoCs contain a system controller (like the SYSFW, etc...) that is +responsible for controlling the state of the IPs that are present. +Communication between the host processor running an OS and the system +controller happens through a protocol known as TI SCI [1]. + +[1] http://processors.wiki.ti.com/index.php/TISCI + +PM Domain Node +============== +The PM domain node represents the global PM domain managed by the SYSFW. Because +this relies on the TI SCI protocol to communicate with the SYSFW it must be a +child of the sysfw node. + +Required Properties: +-------------------- +- compatible: Must be "ti,sci-pm-domain" +- #power-domain-cells: Must be 1 so that an id can be provided in each + device node. + +Example (AM65x): +---------------- + sysfw: sysfw { + compatible = "ti,am654-system-controller"; + ... + k3_pds: power-controller { + compatible = "ti,sci-pm-domain"; + #power-domain-cells = <1>; + }; + }; + +PM Domain Consumers +=================== +Hardware blocks belonging to a PM domain should contain a "power-domains" +property that is a phandle pointing to the corresponding PM domain node +along with an index representing the device id to be passed to the PMMC +for device control. + +Required Properties: +-------------------- +- power-domains: phandle pointing to the corresponding PM domain node + and an ID representing the device. + +Example (AM65x): +---------------- + uart2: serial@02800000 { + compatible = "ti,omap4-uart"; + ... + power-domains = <&k3_pds 0x3f>; + }; diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig index 4618847..2c34488 100644 --- a/drivers/power/domain/Kconfig +++ b/drivers/power/domain/Kconfig @@ -38,4 +38,11 @@ config TEGRA186_POWER_DOMAIN Enable support for manipulating Tegra's on-SoC power domains via IPC requests to the BPMP (Boot and Power Management Processor). +config TI_SCI_POWER_DOMAIN + bool "Enable the TI SCI-based power domain driver" + depends on POWER_DOMAIN && TI_SCI_PROTOCOL + help + Generic power domain implementation for TI devices implementing the + TI SCI protocol. + endmenu diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile index c541330..6bdaa17 100644 --- a/drivers/power/domain/Makefile +++ b/drivers/power/domain/Makefile @@ -8,3 +8,4 @@ obj-$(CONFIG_MESON_GX_VPU_POWER_DOMAIN) += meson-gx-pwrc-vpu.o obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain.o obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o +obj-$(CONFIG_TI_SCI_POWER_DOMAIN) += ti-sci-power-domain.o diff --git a/drivers/power/domain/ti-sci-power-domain.c b/drivers/power/domain/ti-sci-power-domain.c new file mode 100644 index 0000000..aafde62 --- /dev/null +++ b/drivers/power/domain/ti-sci-power-domain.c @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Texas Instruments System Control Interface (TI SCI) power domain driver + * + * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ + * Andreas Dannenberg <dannenberg@ti.com> + * + * Loosely based on Linux kernel ti_sci_pm_domains.c... + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <power-domain-uclass.h> +#include <linux/soc/ti/ti_sci_protocol.h> + +/** + * struct ti_sci_power_domain_data - pm domain controller information structure + * @sci: TI SCI handle used for communication with system controller + */ +struct ti_sci_power_domain_data { + const struct ti_sci_handle *sci; +}; + +static int ti_sci_power_domain_probe(struct udevice *dev) +{ + struct ti_sci_power_domain_data *data = dev_get_priv(dev); + + debug("%s(dev=%p)\n", __func__, dev); + + if (!data) + return -ENOMEM; + + /* Store handle for communication with the system controller */ + data->sci = ti_sci_get_handle(dev); + if (IS_ERR(data->sci)) + return PTR_ERR(data->sci); + + return 0; +} + +static int ti_sci_power_domain_request(struct power_domain *pd) +{ + debug("%s(pd=%p)\n", __func__, pd); + return 0; +} + +static int ti_sci_power_domain_free(struct power_domain *pd) +{ + debug("%s(pd=%p)\n", __func__, pd); + return 0; +} + +static int ti_sci_power_domain_on(struct power_domain *pd) +{ + struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev); + const struct ti_sci_handle *sci = data->sci; + const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops; + int ret; + + debug("%s(pd=%p)\n", __func__, pd); + + ret = dops->get_device(sci, pd->id); + if (ret) + dev_err(power_domain->dev, "%s: get_device failed (%d)\n", + __func__, ret); + + return ret; +} + +static int ti_sci_power_domain_off(struct power_domain *pd) +{ + struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev); + const struct ti_sci_handle *sci = data->sci; + const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops; + int ret; + + debug("%s(pd=%p)\n", __func__, pd); + + ret = dops->put_device(sci, pd->id); + if (ret) + dev_err(power_domain->dev, "%s: put_device failed (%d)\n", + __func__, ret); + + return ret; +} + +static const struct udevice_id ti_sci_power_domain_of_match[] = { + { .compatible = "ti,sci-pm-domain" }, + { /* sentinel */ } +}; + +static struct power_domain_ops ti_sci_power_domain_ops = { + .request = ti_sci_power_domain_request, + .free = ti_sci_power_domain_free, + .on = ti_sci_power_domain_on, + .off = ti_sci_power_domain_off, +}; + +U_BOOT_DRIVER(ti_sci_pm_domains) = { + .name = "ti-sci-pm-domains", + .id = UCLASS_POWER_DOMAIN, + .of_match = ti_sci_power_domain_of_match, + .probe = ti_sci_power_domain_probe, + .priv_auto_alloc_size = sizeof(struct ti_sci_power_domain_data), + .ops = &ti_sci_power_domain_ops, +}; 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