[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: NDavid Anders <danders@amltd.com>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-s3c2410/Kconfig

@@ -292,7 +292,7 @@ config S3C2410_PM_CHECK_CHUNKSIZE
 
 config PM_SIMTEC
 	bool
-	depends on PM && (ARCH_BAST || MACH_VR1000)
+	depends on PM && (ARCH_BAST || MACH_VR1000 || MACH_AML_M5900)
 	default y
 
 config S3C2410_LOWLEVEL_UART_PORT

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")

arch/arm/mach-s3c2410/pm-simtec.c

@@ -49,7 +49,8 @@ static __init int pm_simtec_init(void)
 	/* check which machine we are running on */
 
 	if (!machine_is_bast() && !machine_is_vr1000() &&
-	    !machine_is_anubis() && !machine_is_osiris())
+	    !machine_is_anubis() && !machine_is_osiris() &&
+	    !machine_is_aml_m5900())
 		return 0;
 
 	printk(KERN_INFO "Simtec Board Power Manangement" COPYRIGHT "\n");

arch/arm/mach-s3c2410/s3c2410-pm.c

@@ -29,6 +29,8 @@
 #include <asm/hardware.h>
 #include <asm/io.h>
 
+#include <asm/mach-types.h>
+
 #include <asm/arch/regs-gpio.h>
 
 #include "cpu.h"
@@ -49,6 +51,10 @@ static void s3c2410_pm_prepare(void)
 
 	DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
 	DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
+
+	if ( machine_is_aml_m5900() )
+		s3c2410_gpio_setpin(S3C2410_GPF2, 1);
+
 }
 
 int s3c2410_pm_resume(struct sys_device *dev)
@@ -61,6 +67,9 @@ int s3c2410_pm_resume(struct sys_device *dev)
 	tmp &= S3C2410_GSTATUS2_OFFRESET;
 	__raw_writel(tmp, S3C2410_GSTATUS2);
 
+	if ( machine_is_aml_m5900() )
+		s3c2410_gpio_setpin(S3C2410_GPF2, 0);
+
 	return 0;
 }