This reboot driver calls into firmware using TI-SCI to reboot the system. We register the handler with low priority as we want PSCI to remain the main way these devices are rebooted. This driver acts as a fallback if PSCI is not able to reboot the system. Signed-off-by: Andrew Davis <afd@xxxxxx> --- MAINTAINERS | 1 + drivers/power/reset/Kconfig | 7 ++++ drivers/power/reset/Makefile | 1 + drivers/power/reset/ti-sci-reboot.c | 63 +++++++++++++++++++++++++++++ 4 files changed, 72 insertions(+) create mode 100644 drivers/power/reset/ti-sci-reboot.c diff --git a/MAINTAINERS b/MAINTAINERS index 45983bb174fe4..ee67ea497fc56 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -21758,6 +21758,7 @@ F: drivers/clk/keystone/sci-clk.c F: drivers/firmware/ti_sci* F: drivers/irqchip/irq-ti-sci-inta.c F: drivers/irqchip/irq-ti-sci-intr.c +F: drivers/power/reset/ti-sci-reboot.c F: drivers/reset/reset-ti-sci.c F: drivers/soc/ti/ti_sci_inta_msi.c F: drivers/pmdomain/ti/ti_sci_pm_domains.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index fece990af4a75..d3e91e54cae24 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -205,6 +205,13 @@ config POWER_RESET_ST help Reset support for STMicroelectronics boards. +config POWER_RESET_TI_SCI + tristate "TI System Control Interface (TI-SCI) reboot driver" + depends on TI_SCI_PROTOCOL + help + This enables the reboot driver support over TI System Control + Interface available on some TI's SoCs. + config POWER_RESET_TPS65086 bool "TPS65086 restart driver" depends on MFD_TPS65086 diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index a95d1bd275d18..881ca58a43b9c 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -23,6 +23,7 @@ obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o obj-$(CONFIG_POWER_RESET_REGULATOR) += regulator-poweroff.o obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o +obj-$(CONFIG_POWER_RESET_TI_SCI) += ti-sci-reboot.o obj-$(CONFIG_POWER_RESET_TPS65086) += tps65086-restart.o obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o diff --git a/drivers/power/reset/ti-sci-reboot.c b/drivers/power/reset/ti-sci-reboot.c new file mode 100644 index 0000000000000..400bd5d740f8b --- /dev/null +++ b/drivers/power/reset/ti-sci-reboot.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Texas Instrument's System Control Interface (TI-SCI) reboot driver + * + * Copyright (C) 2024 Texas Instruments Incorporated - https://www.ti.com/ + * Andrew Davis <afd@xxxxxx> + */ + +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> + +#include <linux/soc/ti/ti_sci_protocol.h> + +static int ti_sci_reboot_handler(struct sys_off_data *data) +{ + const struct ti_sci_handle *sci = data->cb_data; + const struct ti_sci_core_ops *core_ops = &sci->ops.core_ops; + + core_ops->reboot_device(sci); + + return NOTIFY_DONE; +} + +static int ti_sci_reboot_probe(struct platform_device *pdev) +{ + const struct ti_sci_handle *sci; + int err; + + sci = devm_ti_sci_get_handle(&pdev->dev); + if (IS_ERR(sci)) + return PTR_ERR(sci); + + err = devm_register_sys_off_handler(&pdev->dev, + SYS_OFF_MODE_RESTART, + SYS_OFF_PRIO_LOW, + ti_sci_reboot_handler, + (void *)sci); + if (err) + return dev_err_probe(&pdev->dev, err, "Cannot register restart handler\n"); + + return 0; +} + +static const struct of_device_id ti_sci_reboot_of_match[] = { + { .compatible = "ti,sci-reboot", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, ti_sci_reboot_of_match); + +static struct platform_driver ti_sci_reboot_driver = { + .probe = ti_sci_reboot_probe, + .driver = { + .name = "ti-sci-reboot", + .of_match_table = ti_sci_reboot_of_match, + }, +}; +module_platform_driver(ti_sci_reboot_driver); + +MODULE_AUTHOR("Andrew Davis <afd@xxxxxx>"); +MODULE_DESCRIPTION("TI System Control Interface (TI SCI) Reboot driver"); +MODULE_LICENSE("GPL"); -- 2.39.2
