From c016550490687c6bdbcdf06c7b4d874b6c7c6e4e Mon Sep 17 00:00:00 2001
From: eric miao <eric.miao@marvell.com>
Date: Mon, 28 Jan 2008 23:00:02 +0000
Subject: [ARM] pxa: introduce sysdev for IRQ register saving/restoring

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/mach-pxa/irq.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

(limited to 'arch/arm/mach-pxa/irq.c')

diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
index 07acb45..5a1d5ee 100644
--- a/arch/arm/mach-pxa/irq.c
+++ b/arch/arm/mach-pxa/irq.c
@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
+#include <linux/sysdev.h>
 
 #include <asm/hardware.h>
 #include <asm/irq.h>
@@ -321,3 +322,64 @@ void __init pxa_init_irq_set_wake(int (*set_wake)(unsigned int, unsigned int))
 	pxa_low_gpio_chip.set_wake = set_wake;
 	pxa_muxed_gpio_chip.set_wake = set_wake;
 }
+
+#ifdef CONFIG_PM
+static unsigned long saved_icmr[2];
+
+static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state)
+{
+	switch (dev->id) {
+	case 0:
+		saved_icmr[0] = ICMR;
+		ICMR = 0;
+		break;
+#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
+	case 1:
+		saved_icmr[1] = ICMR2;
+		ICMR2 = 0;
+		break;
+#endif
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int pxa_irq_resume(struct sys_device *dev)
+{
+	switch (dev->id) {
+	case 0:
+		ICMR = saved_icmr[0];
+		ICLR = 0;
+		ICCR = 1;
+		break;
+#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
+	case 1:
+		ICMR2 = saved_icmr[1];
+		ICLR2 = 0;
+		break;
+#endif
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+#else
+#define pxa_irq_suspend		NULL
+#define pxa_irq_resume		NULL
+#endif
+
+struct sysdev_class pxa_irq_sysclass = {
+	.name		= "irq",
+	.suspend	= pxa_irq_suspend,
+	.resume		= pxa_irq_resume,
+};
+
+static int __init pxa_irq_init(void)
+{
+	return sysdev_class_register(&pxa_irq_sysclass);
+}
+
+core_initcall(pxa_irq_init);
-- 
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