cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pm.c (2101B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * loongson-specific suspend support
      4 *
      5 *  Copyright (C) 2009 Lemote Inc.
      6 *  Author: Wu Zhangjin <wuzhangjin@gmail.com>
      7 */
      8#include <linux/suspend.h>
      9#include <linux/interrupt.h>
     10#include <linux/pm.h>
     11
     12#include <asm/i8259.h>
     13#include <asm/mipsregs.h>
     14
     15#include <loongson.h>
     16
     17static unsigned int __maybe_unused cached_master_mask;	/* i8259A */
     18static unsigned int __maybe_unused cached_slave_mask;
     19static unsigned int __maybe_unused cached_bonito_irq_mask; /* bonito */
     20
     21void arch_suspend_disable_irqs(void)
     22{
     23	/* disable all mips events */
     24	local_irq_disable();
     25
     26#ifdef CONFIG_I8259
     27	/* disable all events of i8259A */
     28	cached_slave_mask = inb(PIC_SLAVE_IMR);
     29	cached_master_mask = inb(PIC_MASTER_IMR);
     30
     31	outb(0xff, PIC_SLAVE_IMR);
     32	inb(PIC_SLAVE_IMR);
     33	outb(0xff, PIC_MASTER_IMR);
     34	inb(PIC_MASTER_IMR);
     35#endif
     36	/* disable all events of bonito */
     37	cached_bonito_irq_mask = LOONGSON_INTEN;
     38	LOONGSON_INTENCLR = 0xffff;
     39	(void)LOONGSON_INTENCLR;
     40}
     41
     42void arch_suspend_enable_irqs(void)
     43{
     44	/* enable all mips events */
     45	local_irq_enable();
     46#ifdef CONFIG_I8259
     47	/* only enable the cached events of i8259A */
     48	outb(cached_slave_mask, PIC_SLAVE_IMR);
     49	outb(cached_master_mask, PIC_MASTER_IMR);
     50#endif
     51	/* enable all cached events of bonito */
     52	LOONGSON_INTENSET = cached_bonito_irq_mask;
     53	(void)LOONGSON_INTENSET;
     54}
     55
     56/*
     57 * Setup the board-specific events for waking up loongson from wait mode
     58 */
     59void __weak setup_wakeup_events(void)
     60{
     61}
     62
     63void __weak mach_suspend(void)
     64{
     65}
     66
     67void __weak mach_resume(void)
     68{
     69}
     70
     71static int loongson_pm_enter(suspend_state_t state)
     72{
     73	mach_suspend();
     74
     75	mach_resume();
     76
     77	return 0;
     78}
     79
     80static int loongson_pm_valid_state(suspend_state_t state)
     81{
     82	switch (state) {
     83	case PM_SUSPEND_ON:
     84	case PM_SUSPEND_STANDBY:
     85	case PM_SUSPEND_MEM:
     86		return 1;
     87
     88	default:
     89		return 0;
     90	}
     91}
     92
     93static const struct platform_suspend_ops loongson_pm_ops = {
     94	.valid	= loongson_pm_valid_state,
     95	.enter	= loongson_pm_enter,
     96};
     97
     98static int __init loongson_pm_init(void)
     99{
    100	suspend_set_ops(&loongson_pm_ops);
    101
    102	return 0;
    103}
    104arch_initcall(loongson_pm_init);