1 files changed, 53 insertions, 1 deletions

diff --git a/arch/avr32/mach-at32ap/intc.c b/arch/avr32/mach-at32ap/intc.c
index 644a3fb8c164..994c4545e2b7 100644
--- a/arch/avr32/mach-at32ap/intc.c
+++ b/arch/avr32/mach-at32ap/intc.c
@@ -22,6 +22,10 @@ struct intc {
         void __iomem            *regs;
         struct irq_chip         chip;
         struct sys_device       sysdev;
+#ifdef CONFIG_PM
+        unsigned long           suspend_ipr;
+        unsigned long           saved_ipr[64];
+#endif
 };
 
 extern struct platform_device at32_intc0_device;
@@ -138,8 +142,56 @@ fail:
         panic("Interrupt controller initialization failed!\n");
 }
 
+#ifdef CONFIG_PM
+void intc_set_suspend_handler(unsigned long offset)
+{
+        intc0.suspend_ipr = offset;
+}
+
+static int intc_suspend(struct sys_device *sdev, pm_message_t state)
+{
+        struct intc *intc = container_of(sdev, struct intc, sysdev);
+        int i;
+
+        if (unlikely(!irqs_disabled())) {
+                pr_err("intc_suspend: called with interrupts enabled\n");
+                return -EINVAL;
+        }
+
+        if (unlikely(!intc->suspend_ipr)) {
+                pr_err("intc_suspend: suspend_ipr not initialized\n");
+                return -EINVAL;
+        }
+
+        for (i = 0; i < 64; i++) {
+                intc->saved_ipr[i] = intc_readl(intc, INTPR0 + 4 * i);
+                intc_writel(intc, INTPR0 + 4 * i, intc->suspend_ipr);
+        }
+
+        return 0;
+}
+
+static int intc_resume(struct sys_device *sdev)
+{
+        struct intc *intc = container_of(sdev, struct intc, sysdev);
+        int i;
+
+        WARN_ON(!irqs_disabled());
+
+        for (i = 0; i < 64; i++)
+                intc_writel(intc, INTPR0 + 4 * i, intc->saved_ipr[i]);
+
+        return 0;
+}
+#else
+#define intc_suspend    NULL
+#define intc_resume     NULL
+#endif
+
 static struct sysdev_class intc_class = {
-        .name   = "intc",
+        .name           = "intc",
+        .suspend        = intc_suspend,
+        .resume         = intc_resume,
 };
 
 static int __init intc_init_sysdev(void)