Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
driver: reset: th1520-aon: add driver for poweroff/reboot via AON FW
This driver implements poweroff/reboot support for T-Head TH1520 SoCs
running the AON firmware by sending a message to the AON firmware's WDG
part.
This is a auxiliary device driver, and expects the AON channel to be
passed via the platform_data of the auxiliary device.
Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
authored by
Icenowy Zheng
and committed by
Ulf Hansson
2d81a24a
c60934d5
+107
+1
MAINTAINERS
+1
MAINTAINERS
···
21732
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F: drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c
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F: drivers/pinctrl/pinctrl-th1520.c
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F: drivers/pmdomain/thead/
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F: drivers/power/reset/th1520-aon-reboot.c
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F: drivers/power/sequencing/pwrseq-thead-gpu.c
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F: drivers/reset/reset-th1520.c
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F: include/dt-bindings/clock/thead,th1520-clk-ap.h
+7
drivers/power/reset/Kconfig
+7
drivers/power/reset/Kconfig
···
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help
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Reset support for STMicroelectronics boards.
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config POWER_RESET_TH1520_AON
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tristate "T-Head TH1520 AON firmware poweroff and reset driver"
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depends on TH1520_PM_DOMAINS
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help
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This driver supports power-off and reset operations for T-Head
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TH1520 SoCs running the AON firmware.
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config POWER_RESET_TORADEX_EC
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tristate "Toradex Embedded Controller power-off and reset driver"
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depends on ARCH_MXC || COMPILE_TEST
+1
drivers/power/reset/Makefile
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drivers/power/reset/Makefile
···
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obj-$(CONFIG_POWER_RESET_REGULATOR) += regulator-poweroff.o
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obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
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obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o
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obj-$(CONFIG_POWER_RESET_TH1520_AON) += th1520-aon-reboot.o
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obj-$(CONFIG_POWER_RESET_TORADEX_EC) += tdx-ec-poweroff.o
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obj-$(CONFIG_POWER_RESET_TPS65086) += tps65086-restart.o
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obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o
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drivers/power/reset/th1520-aon-reboot.c
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drivers/power/reset/th1520-aon-reboot.c
···
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// SPDX-License-Identifier: GPL-2.0
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/*
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* T-HEAD TH1520 AON Firmware Reboot Driver
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*
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* Copyright (c) 2025 Icenowy Zheng <uwu@icenowy.me>
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*/
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+
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#include <linux/auxiliary_bus.h>
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#include <linux/firmware/thead/thead,th1520-aon.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/of.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#define TH1520_AON_REBOOT_PRIORITY 200
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struct th1520_aon_msg_empty_body {
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struct th1520_aon_rpc_msg_hdr hdr;
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u16 reserved[12];
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} __packed __aligned(1);
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+
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static int th1520_aon_pwroff_handler(struct sys_off_data *data)
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{
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struct th1520_aon_chan *aon_chan = data->cb_data;
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struct th1520_aon_msg_empty_body msg = {};
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+
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msg.hdr.svc = TH1520_AON_RPC_SVC_WDG;
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msg.hdr.func = TH1520_AON_WDG_FUNC_POWER_OFF;
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msg.hdr.size = TH1520_AON_RPC_MSG_NUM;
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th1520_aon_call_rpc(aon_chan, &msg);
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return NOTIFY_DONE;
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}
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static int th1520_aon_restart_handler(struct sys_off_data *data)
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{
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struct th1520_aon_chan *aon_chan = data->cb_data;
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struct th1520_aon_msg_empty_body msg = {};
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msg.hdr.svc = TH1520_AON_RPC_SVC_WDG;
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msg.hdr.func = TH1520_AON_WDG_FUNC_RESTART;
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msg.hdr.size = TH1520_AON_RPC_MSG_NUM;
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th1520_aon_call_rpc(aon_chan, &msg);
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return NOTIFY_DONE;
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}
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static int th1520_aon_reboot_probe(struct auxiliary_device *adev,
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const struct auxiliary_device_id *id)
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{
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struct device *dev = &adev->dev;
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int ret;
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/* Expect struct th1520_aon_chan to be passed via platform_data */
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ret = devm_register_sys_off_handler(dev, SYS_OFF_MODE_POWER_OFF,
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TH1520_AON_REBOOT_PRIORITY,
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th1520_aon_pwroff_handler,
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adev->dev.platform_data);
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if (ret) {
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dev_err(dev, "Failed to register power off handler\n");
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return ret;
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}
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ret = devm_register_sys_off_handler(dev, SYS_OFF_MODE_RESTART,
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TH1520_AON_REBOOT_PRIORITY,
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th1520_aon_restart_handler,
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adev->dev.platform_data);
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if (ret) {
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dev_err(dev, "Failed to register restart handler\n");
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return ret;
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}
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return 0;
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}
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static const struct auxiliary_device_id th1520_aon_reboot_id_table[] = {
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{ .name = "th1520_pm_domains.reboot" },
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{},
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};
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MODULE_DEVICE_TABLE(auxiliary, th1520_aon_reboot_id_table);
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static struct auxiliary_driver th1520_aon_reboot_driver = {
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.driver = {
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.name = "th1520-aon-reboot",
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},
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.probe = th1520_aon_reboot_probe,
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.id_table = th1520_aon_reboot_id_table,
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};
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module_auxiliary_driver(th1520_aon_reboot_driver);
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MODULE_AUTHOR("Icenowy Zheng <uwu@icenowy.me>");
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MODULE_DESCRIPTION("T-HEAD TH1520 AON-firmware-based reboot driver");
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MODULE_LICENSE("GPL");