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Commit bacd2262 authored by Ping Jiang's avatar Ping Jiang
Browse files

power: reset: Add snapshot of vm power off driver 



Add snapshot of vm power off driver as of msm-4.14
'commit 77a20e0a50e1
("power: reset: cache flush before VM restart")'.

Change-Id: I380b16f46429711284bb6717847a1eef5d8ee9b1
Signed-off-by: default avatarPing Jiang <scottjiang@codeaurora.org>
parent be60e6e7

drivers/power/reset/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -105,6 +105,14 @@ config POWER_RESET_MSM 
	help

	  Power off and restart support for Qualcomm boards.



config POWER_RESET_QCOM_VM

	tristate "Qualcomm Technologies, Inc. MSM VM power-off driver"

	help

	  Power off and restart support for Qualcomm Technologies, Inc. virtual

	  machine. This driver supports virtual machine power down and restart.

	  Say Y here if you have a MSM virtual machine and wish to enable

	  restart driver.



config POWER_RESET_QCOM_DOWNLOAD_MODE

	tristate "MSM download mode driver"

	depends on ARCH_QCOM

drivers/power/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o 
obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o

obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o

obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o

obj-$(CONFIG_POWER_RESET_QCOM_VM) += msm-vm-poweroff.o

obj-$(CONFIG_POWER_RESET_QCOM_DOWNLOAD_MODE) += qcom-dload-mode.o

obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o

obj-$(CONFIG_POWER_RESET_QCOM_REBOOT_REASON) += qcom-reboot-reason.o

drivers/power/reset/msm-vm-poweroff.c

0 → 100644
+94 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2019-2021, The Linux Foundation. All rights reserved.

 */



#include <linux/io.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/module.h>

#include <linux/reboot.h>

#include <linux/pm.h>

#include <linux/delay.h>

#include <linux/of_address.h>



#include <asm/cacheflush.h>

#include <asm/system_misc.h>

#include <soc/qcom/watchdog.h>



static int in_panic;

static struct notifier_block restart_nb;



static int panic_prep_restart(struct notifier_block *this,

			      unsigned long event, void *ptr)

{

	in_panic = 1;

	return NOTIFY_DONE;

}



static struct notifier_block panic_blk = {

	.notifier_call	= panic_prep_restart,

};



static int do_vm_restart(struct notifier_block *unused, unsigned long action,

						void *arg)

{

	pr_notice("Going down for vm restart now\n");



	flush_cache_all();



	/*outer_flush_all is not supported by 64bit kernel*/

#ifndef CONFIG_ARM64

	outer_flush_all();

#endif



	if (in_panic)

		qcom_wdt_trigger_bite();



	return NOTIFY_DONE;

}



static int vm_restart_probe(struct platform_device *pdev)

{

	atomic_notifier_chain_register(&panic_notifier_list, &panic_blk);



	restart_nb.notifier_call = do_vm_restart;

	restart_nb.priority = 200;

	register_restart_handler(&restart_nb);



	return 0;

}



static const struct of_device_id of_vm_restart_match[] = {

	{ .compatible = "qcom,vm-restart", },

	{},

};

MODULE_DEVICE_TABLE(of, of_vm_restart_match);



static struct platform_driver vm_restart_driver = {

	.probe = vm_restart_probe,

	.driver = {

		.name = "msm-vm-restart",

		.of_match_table = of_match_ptr(of_vm_restart_match),

	},

};



static int __init vm_restart_init(void)

{

	return platform_driver_register(&vm_restart_driver);

}



#if IS_MODULE(CONFIG_POWER_RESET_QCOM_VM)

module_init(vm_restart_init);

#else

pure_initcall(vm_restart_init);

#endif



static __exit void vm_restart_exit(void)

{

	platform_driver_unregister(&vm_restart_driver);

}

module_exit(vm_restart_exit);



MODULE_DESCRIPTION("MSM VM Poweroff Driver");

MODULE_LICENSE("GPL v2");