Add power management support for i.MX1/L
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
Index: linux-2.6.26-rc1/arch/arm/mach-imx/Makefile
===================================================================
--- linux-2.6.26-rc1.orig/arch/arm/mach-imx/Makefile
+++ linux-2.6.26-rc1/arch/arm/mach-imx/Makefile
@@ -6,8 +6,14 @@
obj-y += irq.o time.o dma.o generic.o
+# Power management
+obj-$(CONFIG_PM) += pm.o
obj-$(CONFIG_CPU_FREQ_IMX) += cpufreq.o
+ifeq ($(CONFIG_PM_DEBUG),y)
+CFLAGS_pm.o += -DDEBUG
+endif
+
# Specific board support
obj-$(CONFIG_ARCH_MX1ADS) += mx1ads.o
Index: linux-2.6.26-rc1/arch/arm/mach-imx/pm.c
===================================================================
--- /dev/null
+++ linux-2.6.26-rc1/arch/arm/mach-imx/pm.c
@@ -0,0 +1,53 @@
+/*
+ * i.MX Power Management
+ *
+ * Copyright (c) 2008 Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
+ *
+ * This file may be distributed under the terms of the GNU General
+ * Public License, version 2.
+ */
+
+#include <linux/suspend.h>
+#include <asm/arch/hardware.h>
+
+static int imx_pm_valid_state(suspend_state_t state)
+{
+ if (state == PM_SUSPEND_STANDBY)
+ return 1;
+
+ return 0;
+}
+
+static int imx_pm_enter(suspend_state_t state)
+{
+ switch (state) {
+ case PM_SUSPEND_STANDBY:
+ /* disable System PLL and MCU PLL */
+ CSCR &= ~(CSCR_SPEN | CSCR_MPEN);
+ break;
+ default:
+ pr_debug("i.MX: PM - bogus suspend state %d\n", state);
+ goto exit;
+ }
+
+ pr_debug("i.MX: PM - wakeup\n");
+
+exit:
+ return 0;
+}
+
+static struct platform_suspend_ops imx_pm_ops ={
+ .valid = imx_pm_valid_state,
+ .enter = imx_pm_enter,
+};
+
+static int __init imx_pm_init(void)
+{
+ pr_info("i.MX: Power Management\n");
+
+ suspend_set_ops(&imx_pm_ops);
+
+ return 0;
+}
+
+arch_initcall(imx_pm_init);
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