Initial import

1 files changed, 49 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/pm-imx27.c b/arch/arm/mach-imx/pm-imx27.c
new file mode 100644
index 000000000..56d02d064
--- /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 "hardware.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 */
+		cpu_do_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);