Commit 2d81a24a authored by Icenowy Zheng's avatar Icenowy Zheng Committed by Ulf Hansson
Browse files

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: default avatarIcenowy Zheng <uwu@icenowy.me>
Acked-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent c60934d5

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -21732,6 +21732,7 @@ F: drivers/mailbox/mailbox-th1520.c 
F:	drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c

F:	drivers/pinctrl/pinctrl-th1520.c

F:	drivers/pmdomain/thead/

F:	drivers/power/reset/th1520-aon-reboot.c

F:	drivers/power/sequencing/pwrseq-thead-gpu.c

F:	drivers/reset/reset-th1520.c

F:	include/dt-bindings/clock/thead,th1520-clk-ap.h

drivers/power/reset/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -225,6 +225,13 @@ config POWER_RESET_ST 
	help

	  Reset support for STMicroelectronics boards.



config POWER_RESET_TH1520_AON

	tristate "T-Head TH1520 AON firmware poweroff and reset driver"

	depends on TH1520_PM_DOMAINS

	help

	  This driver supports power-off and reset operations for T-Head

	  TH1520 SoCs running the AON firmware.



config POWER_RESET_TORADEX_EC

	tristate "Toradex Embedded Controller power-off and reset driver"

	depends on ARCH_MXC || COMPILE_TEST

drivers/power/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 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_TH1520_AON) += th1520-aon-reboot.o

obj-$(CONFIG_POWER_RESET_TORADEX_EC) += tdx-ec-poweroff.o

obj-$(CONFIG_POWER_RESET_TPS65086) += tps65086-restart.o

obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o

drivers/power/reset/th1520-aon-reboot.c

0 → 100644
+98 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * T-HEAD TH1520 AON Firmware Reboot Driver

 *

 * Copyright (c) 2025 Icenowy Zheng <uwu@icenowy.me>

 */



#include <linux/auxiliary_bus.h>

#include <linux/firmware/thead/thead,th1520-aon.h>

#include <linux/module.h>

#include <linux/notifier.h>

#include <linux/of.h>

#include <linux/reboot.h>

#include <linux/slab.h>



#define TH1520_AON_REBOOT_PRIORITY 200



struct th1520_aon_msg_empty_body {

	struct th1520_aon_rpc_msg_hdr hdr;

	u16 reserved[12];

} __packed __aligned(1);



static int th1520_aon_pwroff_handler(struct sys_off_data *data)

{

	struct th1520_aon_chan *aon_chan = data->cb_data;

	struct th1520_aon_msg_empty_body msg = {};



	msg.hdr.svc = TH1520_AON_RPC_SVC_WDG;

	msg.hdr.func = TH1520_AON_WDG_FUNC_POWER_OFF;

	msg.hdr.size = TH1520_AON_RPC_MSG_NUM;



	th1520_aon_call_rpc(aon_chan, &msg);



	return NOTIFY_DONE;

}



static int th1520_aon_restart_handler(struct sys_off_data *data)

{

	struct th1520_aon_chan *aon_chan = data->cb_data;

	struct th1520_aon_msg_empty_body msg = {};



	msg.hdr.svc = TH1520_AON_RPC_SVC_WDG;

	msg.hdr.func = TH1520_AON_WDG_FUNC_RESTART;

	msg.hdr.size = TH1520_AON_RPC_MSG_NUM;



	th1520_aon_call_rpc(aon_chan, &msg);



	return NOTIFY_DONE;

}



static int th1520_aon_reboot_probe(struct auxiliary_device *adev,

				  const struct auxiliary_device_id *id)

{

	struct device *dev = &adev->dev;

	int ret;



	/* Expect struct th1520_aon_chan to be passed via platform_data */

	ret = devm_register_sys_off_handler(dev, SYS_OFF_MODE_POWER_OFF,

					    TH1520_AON_REBOOT_PRIORITY,

					    th1520_aon_pwroff_handler,

					    adev->dev.platform_data);



	if (ret) {

		dev_err(dev, "Failed to register power off handler\n");

		return ret;

	}



	ret = devm_register_sys_off_handler(dev, SYS_OFF_MODE_RESTART,

					    TH1520_AON_REBOOT_PRIORITY,

					    th1520_aon_restart_handler,

					    adev->dev.platform_data);



	if (ret) {

		dev_err(dev, "Failed to register restart handler\n");

		return ret;

	}



	return 0;

}



static const struct auxiliary_device_id th1520_aon_reboot_id_table[] = {

	{ .name = "th1520_pm_domains.reboot" },

	{},

};

MODULE_DEVICE_TABLE(auxiliary, th1520_aon_reboot_id_table);



static struct auxiliary_driver th1520_aon_reboot_driver = {

	.driver = {

		.name = "th1520-aon-reboot",

	},

	.probe = th1520_aon_reboot_probe,

	.id_table = th1520_aon_reboot_id_table,

};

module_auxiliary_driver(th1520_aon_reboot_driver);



MODULE_AUTHOR("Icenowy Zheng <uwu@icenowy.me>");

MODULE_DESCRIPTION("T-HEAD TH1520 AON-firmware-based reboot driver");

MODULE_LICENSE("GPL");