[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>

1 files changed, 62 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
index 07acb45b16ea..5a1d5eef10a4 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);