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-s3c2412.c (2828B)

      1// SPDX-License-Identifier: GPL-2.0
      2//
      3// Copyright (c) 2006 Simtec Electronics
      4//	Ben Dooks <ben@simtec.co.uk>
      5//
      6// http://armlinux.simtec.co.uk/.
      7
      8#include <linux/kernel.h>
      9#include <linux/types.h>
     10#include <linux/interrupt.h>
     11#include <linux/list.h>
     12#include <linux/timer.h>
     13#include <linux/init.h>
     14#include <linux/device.h>
     15#include <linux/syscore_ops.h>
     16#include <linux/platform_device.h>
     17#include <linux/io.h>
     18
     19#include <asm/cacheflush.h>
     20#include <asm/irq.h>
     21
     22#include "irqs.h"
     23#include "regs-gpio.h"
     24
     25#include "cpu.h"
     26#include "pm.h"
     27#include "wakeup-mask.h"
     28
     29#include "regs-dsc-s3c24xx.h"
     30#include "s3c2412-power.h"
     31
     32extern void s3c2412_sleep_enter(void);
     33
     34static int s3c2412_cpu_suspend(unsigned long arg)
     35{
     36	unsigned long tmp;
     37
     38	/* set our standby method to sleep */
     39
     40	tmp = __raw_readl(S3C2412_PWRCFG);
     41	tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
     42	__raw_writel(tmp, S3C2412_PWRCFG);
     43
     44	s3c2412_sleep_enter();
     45
     46	pr_info("Failed to suspend the system\n");
     47	return 1; /* Aborting suspend */
     48}
     49
     50/* mapping of interrupts to parts of the wakeup mask */
     51static const struct samsung_wakeup_mask wake_irqs[] = {
     52	{ .irq = IRQ_RTC,	.bit = S3C2412_PWRCFG_RTC_MASKIRQ, },
     53};
     54
     55static void s3c2412_pm_prepare(void)
     56{
     57	samsung_sync_wakemask(S3C2412_PWRCFG,
     58			      wake_irqs, ARRAY_SIZE(wake_irqs));
     59}
     60
     61static int s3c2412_pm_add(struct device *dev, struct subsys_interface *sif)
     62{
     63	pm_cpu_prep = s3c2412_pm_prepare;
     64	pm_cpu_sleep = s3c2412_cpu_suspend;
     65
     66	return 0;
     67}
     68
     69static struct sleep_save s3c2412_sleep[] = {
     70	SAVE_ITEM(S3C2412_DSC0),
     71	SAVE_ITEM(S3C2412_DSC1),
     72	SAVE_ITEM(S3C2413_GPJDAT),
     73	SAVE_ITEM(S3C2413_GPJCON),
     74	SAVE_ITEM(S3C2413_GPJUP),
     75
     76	/* save the PWRCFG to get back to original sleep method */
     77
     78	SAVE_ITEM(S3C2412_PWRCFG),
     79
     80	/* save the sleep configuration anyway, just in case these
     81	 * get damaged during wakeup */
     82
     83	SAVE_ITEM(S3C2412_GPBSLPCON),
     84	SAVE_ITEM(S3C2412_GPCSLPCON),
     85	SAVE_ITEM(S3C2412_GPDSLPCON),
     86	SAVE_ITEM(S3C2412_GPFSLPCON),
     87	SAVE_ITEM(S3C2412_GPGSLPCON),
     88	SAVE_ITEM(S3C2412_GPHSLPCON),
     89	SAVE_ITEM(S3C2413_GPJSLPCON),
     90};
     91
     92static struct subsys_interface s3c2412_pm_interface = {
     93	.name		= "s3c2412_pm",
     94	.subsys		= &s3c2412_subsys,
     95	.add_dev	= s3c2412_pm_add,
     96};
     97
     98static __init int s3c2412_pm_init(void)
     99{
    100	return subsys_interface_register(&s3c2412_pm_interface);
    101}
    102
    103arch_initcall(s3c2412_pm_init);
    104
    105static int s3c2412_pm_suspend(void)
    106{
    107	s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
    108	return 0;
    109}
    110
    111static void s3c2412_pm_resume(void)
    112{
    113	unsigned long tmp;
    114
    115	tmp = __raw_readl(S3C2412_PWRCFG);
    116	tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
    117	tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
    118	__raw_writel(tmp, S3C2412_PWRCFG);
    119
    120	s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
    121}
    122
    123struct syscore_ops s3c2412_pm_syscore_ops = {
    124	.suspend	= s3c2412_pm_suspend,
    125	.resume		= s3c2412_pm_resume,
    126};