179 lines
3.9 KiB
C
179 lines
3.9 KiB
C
/* linux/arch/arm/mach-s5pv210/pm.c
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*
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* Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* S5PV210 - Power Management support
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*
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* Based on arch/arm/mach-s3c2410/pm.c
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* Copyright (c) 2006 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/suspend.h>
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#include <linux/syscore_ops.h>
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#include <linux/io.h>
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#include <asm/cacheflush.h>
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#include <asm/suspend.h>
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#include <plat/pm-common.h>
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#include "common.h"
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#include "regs-clock.h"
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static struct sleep_save s5pv210_core_save[] = {
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/* Clock ETC */
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SAVE_ITEM(S5P_MDNIE_SEL),
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};
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/*
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* VIC wake-up support (TODO)
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*/
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static u32 s5pv210_irqwake_intmask = 0xffffffff;
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/*
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* Suspend helpers.
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*/
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static int s5pv210_cpu_suspend(unsigned long arg)
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{
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unsigned long tmp;
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/* issue the standby signal into the pm unit. Note, we
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* issue a write-buffer drain just in case */
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tmp = 0;
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asm("b 1f\n\t"
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".align 5\n\t"
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"1:\n\t"
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"mcr p15, 0, %0, c7, c10, 5\n\t"
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"mcr p15, 0, %0, c7, c10, 4\n\t"
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"wfi" : : "r" (tmp));
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pr_info("Failed to suspend the system\n");
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return 1; /* Aborting suspend */
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}
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static void s5pv210_pm_prepare(void)
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{
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unsigned int tmp;
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/* Set wake-up mask registers */
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__raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
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__raw_writel(s5pv210_irqwake_intmask, S5P_WAKEUP_MASK);
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/* ensure at least INFORM0 has the resume address */
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__raw_writel(virt_to_phys(s5pv210_cpu_resume), S5P_INFORM0);
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tmp = __raw_readl(S5P_SLEEP_CFG);
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tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
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__raw_writel(tmp, S5P_SLEEP_CFG);
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/* WFI for SLEEP mode configuration by SYSCON */
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tmp = __raw_readl(S5P_PWR_CFG);
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tmp &= S5P_CFG_WFI_CLEAN;
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tmp |= S5P_CFG_WFI_SLEEP;
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__raw_writel(tmp, S5P_PWR_CFG);
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/* SYSCON interrupt handling disable */
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tmp = __raw_readl(S5P_OTHERS);
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tmp |= S5P_OTHER_SYSC_INTOFF;
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__raw_writel(tmp, S5P_OTHERS);
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s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
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}
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/*
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* Suspend operations.
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*/
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static int s5pv210_suspend_enter(suspend_state_t state)
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{
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int ret;
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s3c_pm_debug_init();
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S3C_PMDBG("%s: suspending the system...\n", __func__);
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S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
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s5pv210_irqwake_intmask, exynos_get_eint_wake_mask());
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if (s5pv210_irqwake_intmask == -1U
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&& exynos_get_eint_wake_mask() == -1U) {
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pr_err("%s: No wake-up sources!\n", __func__);
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pr_err("%s: Aborting sleep\n", __func__);
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return -EINVAL;
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}
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s3c_pm_save_uarts();
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s5pv210_pm_prepare();
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flush_cache_all();
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s3c_pm_check_store();
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ret = cpu_suspend(0, s5pv210_cpu_suspend);
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if (ret)
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return ret;
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s3c_pm_restore_uarts();
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S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
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__raw_readl(S5P_WAKEUP_STAT));
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s3c_pm_check_restore();
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S3C_PMDBG("%s: resuming the system...\n", __func__);
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return 0;
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}
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static int s5pv210_suspend_prepare(void)
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{
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s3c_pm_check_prepare();
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return 0;
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}
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static void s5pv210_suspend_finish(void)
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{
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s3c_pm_check_cleanup();
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}
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static const struct platform_suspend_ops s5pv210_suspend_ops = {
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.enter = s5pv210_suspend_enter,
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.prepare = s5pv210_suspend_prepare,
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.finish = s5pv210_suspend_finish,
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.valid = suspend_valid_only_mem,
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};
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/*
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* Syscore operations used to delay restore of certain registers.
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*/
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static void s5pv210_pm_resume(void)
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{
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u32 tmp;
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tmp = __raw_readl(S5P_OTHERS);
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tmp |= (S5P_OTHERS_RET_IO | S5P_OTHERS_RET_CF |\
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S5P_OTHERS_RET_MMC | S5P_OTHERS_RET_UART);
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__raw_writel(tmp , S5P_OTHERS);
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s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
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}
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static struct syscore_ops s5pv210_pm_syscore_ops = {
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.resume = s5pv210_pm_resume,
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};
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/*
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* Initialization entry point.
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*/
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void __init s5pv210_pm_init(void)
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{
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register_syscore_ops(&s5pv210_pm_syscore_ops);
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suspend_set_ops(&s5pv210_suspend_ops);
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}
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