1 files changed, 52 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 0000000000..237e8aa9fe
--- /dev/null
+++ b/arch/arm/mach-imx/pm-imx27.c
@@ -0,0 +1,52 @@
+/*
+ * 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/of_address.h>
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+#include <linux/io.h>
+
+#include "common.h"
+#include "hardware.h"
+
+static int mx27_suspend_enter(suspend_state_t state)
+{
+	void __iomem *ccm_base;
+	struct device_node *np;
+	u32 cscr;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
+	ccm_base = of_iomap(np, 0);
+	BUG_ON(!ccm_base);
+
+	switch (state) {
+	case PM_SUSPEND_MEM:
+		/* Clear MPEN and SPEN to disable MPLL/SPLL */
+		cscr = imx_readl(ccm_base);
+		cscr &= 0xFFFFFFFC;
+		imx_writel(cscr, ccm_base);
+		/* 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,
+};
+
+void __init imx27_pm_init(void)
+{
+	suspend_set_ops(&mx27_suspend_ops);
+}