irqchip: atmel-aic: Add irq fixup for RTT block

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Link: https://lkml.kernel.org/r/1415003464-29239-2-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-atmel-aic-common.c b/drivers/irqchip/irq-atmel-aic-common.c
index 6ae3cdee0681..656cfe336837 100644
--- a/drivers/irqchip/irq-atmel-aic-common.c
+++ b/drivers/irqchip/irq-atmel-aic-common.c
@@ -167,6 +167,32 @@ void __init aic_common_rtc_irq_fixup(struct device_node *root)
         iounmap(regs);
 }
 
+#define AT91_RTT_MR             0x00                    /* Real-time Mode Register */
+#define AT91_RTT_ALMIEN         (1 << 16)               /* Alarm Interrupt Enable */
+#define AT91_RTT_RTTINCIEN      (1 << 17)               /* Real Time Timer Increment Interrupt Enable */
+
+void __init aic_common_rtt_irq_fixup(struct device_node *root)
+{
+        struct device_node *np;
+        void __iomem *regs;
+
+        /*
+         * The at91sam9263 SoC has 2 instances of the RTT block, hence we
+         * iterate over the DT to find each occurrence.
+         */
+        for_each_compatible_node(np, NULL, "atmel,at91sam9260-rtt") {
+                regs = of_iomap(np, 0);
+                if (!regs)
+                        continue;
+
+                writel(readl(regs + AT91_RTT_MR) &
+                       ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN),
+                       regs + AT91_RTT_MR);
+
+                iounmap(regs);
+        }
+}
+
 void __init aic_common_irq_fixup(const struct of_device_id *matches)
 {
         struct device_node *root = of_find_node_by_path("/");