// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (C) 2014 Imagination Technologies Ltd. * * CPU PM notifiers for saving/restoring general CPU state. */ #include <linux/cpu_pm.h>#include <linux/init.h> #include <asm/dsp.h>#include <asm/fpu.h>#include <asm/mmu_context.h>#include <asm/pm.h>#include <asm/watch.h> /* Used by PM helper macros in asm/pm.h */struct mips_static_suspend_state mips_static_suspend_state; /** * mips_cpu_save() - Save general CPU state. * Ensures that general CPU context is saved, notably FPU and DSP. */static int mips_cpu_save(void){	/* Save FPU state */	lose_fpu(1); 	/* Save DSP state */	save_dsp(current); 	return 0;} /** * mips_cpu_restore() - Restore general CPU state. * Restores important CPU context. */static void mips_cpu_restore(void){	unsigned int cpu = smp_processor_id(); 	/* Restore ASID */	if (current->mm)		write_c0_entryhi(cpu_asid(cpu, current->mm)); 	/* Restore DSP state */	restore_dsp(current); 	/* Restore UserLocal */	if (cpu_has_userlocal)		write_c0_userlocal(current_thread_info()->tp_value); 	/* Restore watch registers */	__restore_watch(current);} /** * mips_pm_notifier() - Notifier for preserving general CPU context. * @self:	Notifier block. * @cmd:	CPU PM event. * @v:		Private data (unused). * * This is called when a CPU power management event occurs, and is used to * ensure that important CPU context is preserved across a CPU power down. */static int mips_pm_notifier(struct notifier_block *self, unsigned long cmd,			    void *v){	int ret; 	switch (cmd) {	case CPU_PM_ENTER:		ret = mips_cpu_save();		if (ret)			return NOTIFY_STOP;		break;	case CPU_PM_ENTER_FAILED:	case CPU_PM_EXIT:		mips_cpu_restore();		break;	} 	return NOTIFY_OK;} static struct notifier_block mips_pm_notifier_block = {	.notifier_call = mips_pm_notifier,}; static int __init mips_pm_init(void){	return cpu_pm_register_notifier(&mips_pm_notifier_block);}arch_initcall(mips_pm_init);