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dabd145692
This patch moves pad retention control from S5PV210 machine code to Exynos pin controller driver. This helps to avoid possible ordering and logical dependencies between machine and pin control code. Till now it worked fine only because sys_ops for machine code and pin controller were called in registration order. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Tomasz Figa <tomasz.figa@gmail.com> For mach-s5pv210: Acked-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
173 lines
3.7 KiB
C
173 lines
3.7 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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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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