From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/arm/mach-imx/pm-imx27.c | 49 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 arch/arm/mach-imx/pm-imx27.c

(limited to 'arch/arm/mach-imx/pm-imx27.c')

diff --git a/arch/arm/mach-imx/pm-imx27.c b/arch/arm/mach-imx/pm-imx27.c
new file mode 100644
index 00000000..acf17691
--- /dev/null
+++ b/arch/arm/mach-imx/pm-imx27.c
@@ -0,0 +1,49 @@
+/*
+ * i.MX27 Power Management Routines
+ *
+ * Based on Freescale's BSP
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License.
+ */
+
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+#include <linux/io.h>
+#include <mach/system.h>
+#include <mach/mx27.h>
+
+static int mx27_suspend_enter(suspend_state_t state)
+{
+	u32 cscr;
+	switch (state) {
+	case PM_SUSPEND_MEM:
+		/* Clear MPEN and SPEN to disable MPLL/SPLL */
+		cscr = __raw_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
+		cscr &= 0xFFFFFFFC;
+		__raw_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
+		/* Executes WFI */
+		arch_idle();
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static const struct platform_suspend_ops mx27_suspend_ops = {
+	.enter = mx27_suspend_enter,
+	.valid = suspend_valid_only_mem,
+};
+
+static int __init mx27_pm_init(void)
+{
+	if (!cpu_is_mx27())
+		return 0;
+
+	suspend_set_ops(&mx27_suspend_ops);
+	return 0;
+}
+
+device_initcall(mx27_pm_init);
-- 
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