irqchip: atmel-aic: Implement RTC irq fixup

Provide an implementation to fix RTC irqs before enabling the irqchip.

This was previously done in arch/arm/mach-at91/sysirq_mask.c but as we're
trying to use standard implementation (IRQCHIP_DECLARE and automatic call
of irqchip_init within arch/arm/kernel/irq.c) we need to do those fixups
in the irqchip driver.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Link: https://lkml.kernel.org/r/1405016741-2407-3-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

2 files changed, 30 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-atmel-aic-common.c b/drivers/irqchip/irq-atmel-aic-common.c
index 4705bdbc6e7b..6ae3cdee0681 100644
--- a/drivers/irqchip/irq-atmel-aic-common.c
+++ b/drivers/irqchip/irq-atmel-aic-common.c
@@ -139,6 +139,34 @@ static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
         }
 }
 
+#define AT91_RTC_IDR           0x24
+#define AT91_RTC_IMR           0x28
+#define AT91_RTC_IRQ_MASK      0x1f
+
+void __init aic_common_rtc_irq_fixup(struct device_node *root)
+{
+        struct device_node *np;
+        void __iomem *regs;
+
+        np = of_find_compatible_node(root, NULL, "atmel,at91rm9200-rtc");
+        if (!np)
+                np = of_find_compatible_node(root, NULL,
+                                             "atmel,at91sam9x5-rtc");
+
+        if (!np)
+                return;
+
+        regs = of_iomap(np, 0);
+        of_node_put(np);
+
+        if (!regs)
+                return;
+
+        writel(AT91_RTC_IRQ_MASK, regs + AT91_RTC_IDR);
+
+        iounmap(regs);
+}
+
 void __init aic_common_irq_fixup(const struct of_device_id *matches)
 {
         struct device_node *root = of_find_node_by_path("/");
diff --git a/drivers/irqchip/irq-atmel-aic-common.h b/drivers/irqchip/irq-atmel-aic-common.h
index aa0a42c36a7f..90aa00e918d6 100644
--- a/drivers/irqchip/irq-atmel-aic-common.h
+++ b/drivers/irqchip/irq-atmel-aic-common.h
@@ -32,6 +32,8 @@ struct irq_domain *__init aic_common_of_init(struct device_node *node,
                                              const struct irq_domain_ops *ops,
                                              const char *name, int nirqs);
 
+void __init aic_common_rtc_irq_fixup(struct device_node *root);
+
 void __init aic_common_irq_fixup(const struct of_device_id *matches);
 
 #endif /* __IRQ_ATMEL_AIC_COMMON_H */