v4.19.13 snapshot.
diff --git a/arch/arm/mach-tango/pm.c b/arch/arm/mach-tango/pm.c
new file mode 100644
index 0000000..028e50c
--- /dev/null
+++ b/arch/arm/mach-tango/pm.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/suspend.h>
+#include <asm/suspend.h>
+#include "smc.h"
+
+static int tango_pm_powerdown(unsigned long arg)
+{
+ tango_suspend(__pa_symbol(cpu_resume));
+
+ return -EIO; /* tango_suspend has failed */
+}
+
+static int tango_pm_enter(suspend_state_t state)
+{
+ if (state == PM_SUSPEND_MEM)
+ return cpu_suspend(0, tango_pm_powerdown);
+
+ return -EINVAL;
+}
+
+static const struct platform_suspend_ops tango_pm_ops = {
+ .enter = tango_pm_enter,
+ .valid = suspend_valid_only_mem,
+};
+
+static int __init tango_pm_init(void)
+{
+ suspend_set_ops(&tango_pm_ops);
+ return 0;
+}
+
+late_initcall(tango_pm_init);