[ARM] 3862/2: S3C2410 - add basic power management support for AML M5900 series

this patch registers the wakeup irq, sets a gpio pin to indicate the
status of system for suspend/resume operations, and adds the machine to
the supported machines for use with the simtec-pm

Signed-off-by: David Anders <danders@amltd.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 23 insertions, 2 deletions

diff --git a/arch/arm/mach-s3c2410/mach-amlm5900.c b/arch/arm/mach-s3c2410/mach-amlm5900.c
index 0c9b7dafbe90..ba5109af40b4 100644
--- a/arch/arm/mach-s3c2410/mach-amlm5900.c
+++ b/arch/arm/mach-s3c2410/mach-amlm5900.c
@@ -225,13 +225,34 @@ static struct s3c2410fb_mach_info __initdata amlm5900_lcd_info = {
 };
 #endif
 
-static void __init amlm5900_init(void)
+static irqreturn_t
+amlm5900_wake_interrupt(int irq, void *ignored, struct pt_regs *regs)
 {
+        return IRQ_HANDLED;
+}
 
+static void amlm5900_init_pm(void)
+{
+        int ret = 0;
+
+        ret = request_irq(IRQ_EINT9, &amlm5900_wake_interrupt,
+                                IRQF_TRIGGER_RISING | IRQF_SHARED,
+                                "amlm5900_wakeup", &amlm5900_wake_interrupt);
+        if (ret != 0) {
+                printk(KERN_ERR "AML-M5900: no wakeup irq, %d?\n", ret);
+        } else {
+                enable_irq_wake(IRQ_EINT9);
+                /* configure the suspend/resume status pin */
+                s3c2410_gpio_cfgpin(S3C2410_GPF2, S3C2410_GPF2_OUTP);
+                s3c2410_gpio_pullup(S3C2410_GPF2, 0);
+        }
+}
+static void __init amlm5900_init(void)
+{
+        amlm5900_init_pm();
 #ifdef CONFIG_FB_S3C2410
         s3c24xx_fb_set_platdata(&amlm5900_lcd_info);
 #endif
-
 }
 
 MACHINE_START(AML_M5900, "AML_M5900")