1 files changed, 167 insertions, 0 deletions
diff --git a/arch/arm/mach-s5pv210/pm.c b/arch/arm/mach-s5pv210/pm.c
new file mode 100644
index 000000000..f491249ab
--- /dev/null
+++ b/arch/arm/mach-s5pv210/pm.c
@@ -0,0 +1,167 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
+//		http://www.samsung.com
+//
+// S5PV210 - Power Management support
+//
+// Based on arch/arm/mach-s3c2410/pm.c
+// Copyright (c) 2006 Simtec Electronics
+//	Ben Dooks <ben@simtec.co.uk>
+
+#include <linux/init.h>
+#include <linux/suspend.h>
+#include <linux/syscore_ops.h>
+#include <linux/io.h>
+
+#include <asm/cacheflush.h>
+#include <asm/suspend.h>
+
+#include <plat/pm-common.h>
+
+#include "common.h"
+#include "regs-clock.h"
+
+static struct sleep_save s5pv210_core_save[] = {
+	/* Clock ETC */
+	SAVE_ITEM(S5P_MDNIE_SEL),
+};
+
+/*
+ * VIC wake-up support (TODO)
+ */
+static u32 s5pv210_irqwake_intmask = 0xffffffff;
+
+/*
+ * Suspend helpers.
+ */
+static int s5pv210_cpu_suspend(unsigned long arg)
+{
+	unsigned long tmp;
+
+	/* issue the standby signal into the pm unit. Note, we
+	 * issue a write-buffer drain just in case */
+
+	tmp = 0;
+
+	asm("b 1f\n\t"
+	    ".align 5\n\t"
+	    "1:\n\t"
+	    "mcr p15, 0, %0, c7, c10, 5\n\t"
+	    "mcr p15, 0, %0, c7, c10, 4\n\t"
+	    "wfi" : : "r" (tmp));
+
+	pr_info("Failed to suspend the system\n");
+	return 1; /* Aborting suspend */
+}
+
+static void s5pv210_pm_prepare(void)
+{
+	unsigned int tmp;
+
+	/* Set wake-up mask registers */
+	__raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
+	__raw_writel(s5pv210_irqwake_intmask, S5P_WAKEUP_MASK);
+
+	/* ensure at least INFORM0 has the resume address */
+	__raw_writel(__pa_symbol(s5pv210_cpu_resume), S5P_INFORM0);
+
+	tmp = __raw_readl(S5P_SLEEP_CFG);
+	tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
+	__raw_writel(tmp, S5P_SLEEP_CFG);
+
+	/* WFI for SLEEP mode configuration by SYSCON */
+	tmp = __raw_readl(S5P_PWR_CFG);
+	tmp &= S5P_CFG_WFI_CLEAN;
+	tmp |= S5P_CFG_WFI_SLEEP;
+	__raw_writel(tmp, S5P_PWR_CFG);
+
+	/* SYSCON interrupt handling disable */
+	tmp = __raw_readl(S5P_OTHERS);
+	tmp |= S5P_OTHER_SYSC_INTOFF;
+	__raw_writel(tmp, S5P_OTHERS);
+
+	s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
+}
+
+/*
+ * Suspend operations.
+ */
+static int s5pv210_suspend_enter(suspend_state_t state)
+{
+	int ret;
+
+	s3c_pm_debug_init();
+
+	S3C_PMDBG("%s: suspending the system...\n", __func__);
+
+	S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
+			s5pv210_irqwake_intmask, exynos_get_eint_wake_mask());
+
+	if (s5pv210_irqwake_intmask == -1U
+	    && exynos_get_eint_wake_mask() == -1U) {
+		pr_err("%s: No wake-up sources!\n", __func__);
+		pr_err("%s: Aborting sleep\n", __func__);
+		return -EINVAL;
+	}
+
+	s3c_pm_save_uarts();
+	s5pv210_pm_prepare();
+	flush_cache_all();
+	s3c_pm_check_store();
+
+	ret = cpu_suspend(0, s5pv210_cpu_suspend);
+	if (ret)
+		return ret;
+
+	s3c_pm_restore_uarts();
+
+	S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
+			__raw_readl(S5P_WAKEUP_STAT));
+
+	s3c_pm_check_restore();
+
+	S3C_PMDBG("%s: resuming the system...\n", __func__);
+
+	return 0;
+}
+
+static int s5pv210_suspend_prepare(void)
+{
+	s3c_pm_check_prepare();
+
+	return 0;
+}
+
+static void s5pv210_suspend_finish(void)
+{
+	s3c_pm_check_cleanup();
+}
+
+static const struct platform_suspend_ops s5pv210_suspend_ops = {
+	.enter		= s5pv210_suspend_enter,
+	.prepare	= s5pv210_suspend_prepare,
+	.finish		= s5pv210_suspend_finish,
+	.valid		= suspend_valid_only_mem,
+};
+
+/*
+ * Syscore operations used to delay restore of certain registers.
+ */
+static void s5pv210_pm_resume(void)
+{
+	s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
+}
+
+static struct syscore_ops s5pv210_pm_syscore_ops = {
+	.resume		= s5pv210_pm_resume,
+};
+
+/*
+ * Initialization entry point.
+ */
+void __init s5pv210_pm_init(void)
+{
+	register_syscore_ops(&s5pv210_pm_syscore_ops);
+	suspend_set_ops(&s5pv210_suspend_ops);
+}