ARM: kirkwood: Add standby support
Implements standby support for Kirkwood SoC. When the SoC enters
standby state the memory PM units are disabled, the DDR is set
in self-refresh mode, and the CPU is set in WFI.
At this point there's no clock gating, as that is considered each
driver's task.
Signed-off-by: Simon Guinot <sguinot@lacie.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
diff --git a/arch/arm/mach-kirkwood/pm.c b/arch/arm/mach-kirkwood/pm.c
new file mode 100644
index 0000000..8783a71
--- /dev/null
+++ b/arch/arm/mach-kirkwood/pm.c
@@ -0,0 +1,73 @@
+/*
+ * Power Management driver for Marvell Kirkwood SoCs
+ *
+ * Copyright (C) 2013 Ezequiel Garcia <ezequiel@free-electrons.com>
+ * Copyright (C) 2010 Simon Guinot <sguinot@lacie.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License,
+ * version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+#include <linux/io.h>
+#include <mach/bridge-regs.h>
+
+static void __iomem *ddr_operation_base;
+
+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,
+};
+
+int __init kirkwood_pm_init(void)
+{
+ ddr_operation_base = ioremap(DDR_OPERATION_BASE, 4);
+ suspend_set_ops(&kirkwood_suspend_ops);
+ return 0;
+}