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-rw-r--r--arch/arm/mach-mvebu/kirkwood-pm.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/arch/arm/mach-mvebu/kirkwood-pm.c b/arch/arm/mach-mvebu/kirkwood-pm.c
new file mode 100644
index 0000000000..7c65ea2a87
--- /dev/null
+++ b/arch/arm/mach-mvebu/kirkwood-pm.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Power Management driver for Marvell Kirkwood SoCs
+ *
+ * Copyright (C) 2013 Ezequiel Garcia <ezequiel@free-electrons.com>
+ * Copyright (C) 2010 Simon Guinot <sguinot@lacie.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+#include <linux/io.h>
+#include "kirkwood.h"
+#include "kirkwood-pm.h"
+
+static void __iomem *ddr_operation_base;
+static void __iomem *memory_pm_ctrl;
+
+static void kirkwood_low_power(void)
+{
+ u32 mem_pm_ctrl;
+
+ mem_pm_ctrl = readl(memory_pm_ctrl);
+
+ /* Set peripherals to low-power mode */
+ writel_relaxed(~0, memory_pm_ctrl);
+
+ /* Set DDR in self-refresh */
+ writel_relaxed(0x7, ddr_operation_base);
+
+ /*
+ * Set CPU in wait-for-interrupt state.
+ * This disables the CPU core clocks,
+ * the array clocks, and also the L2 controller.
+ */
+ cpu_do_idle();
+
+ writel_relaxed(mem_pm_ctrl, memory_pm_ctrl);
+}
+
+static int kirkwood_suspend_enter(suspend_state_t state)
+{
+ switch (state) {
+ case PM_SUSPEND_STANDBY:
+ kirkwood_low_power();
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int kirkwood_pm_valid_standby(suspend_state_t state)
+{
+ return state == PM_SUSPEND_STANDBY;
+}
+
+static const struct platform_suspend_ops kirkwood_suspend_ops = {
+ .enter = kirkwood_suspend_enter,
+ .valid = kirkwood_pm_valid_standby,
+};
+
+void __init kirkwood_pm_init(void)
+{
+ ddr_operation_base = ioremap(DDR_OPERATION_BASE, 4);
+ memory_pm_ctrl = ioremap(MEMORY_PM_CTRL_PHYS, 4);
+
+ suspend_set_ops(&kirkwood_suspend_ops);
+}