i.MX27: add suspend to RAM support
Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx2/pm-imx27.c b/arch/arm/mach-mx2/pm-imx27.c
new file mode 100644
index 0000000..afc17ce
--- /dev/null
+++ b/arch/arm/mach-mx2/pm-imx27.c
@@ -0,0 +1,46 @@
+/*
+ * 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 struct platform_suspend_ops mx27_suspend_ops = {
+ .enter = mx27_suspend_enter,
+ .valid = suspend_valid_only_mem,
+};
+
+static int __init mx27_pm_init(void)
+{
+ suspend_set_ops(&mx27_suspend_ops);
+ return 0;
+}
+
+device_initcall(mx27_pm_init);