[RFC 1/8] arm: fiq: Allow EOI to be communicated to the intc

[Daniel Thompson]

Modern ARM systems require an EOI to be sent to the interrupt controller
on completion of both IRQ and FIQ. The FIQ code currently does not permit
this requiring nasty register poke hacks from the FIQ handler. This patch
provides a simple interface for C based handlers to complete a FIQ.

Signed-off-by: Daniel Thompson <daniel.thompson at linaro.org>
---
 arch/arm/include/asm/fiq.h |  1 +
 arch/arm/kernel/fiq.c      | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/arch/arm/include/asm/fiq.h b/arch/arm/include/asm/fiq.h
index d493d0b..5a2a9b9 100644
--- a/arch/arm/include/asm/fiq.h
+++ b/arch/arm/include/asm/fiq.h
@@ -38,6 +38,7 @@ extern void release_fiq(struct fiq_handler *f);
 extern void set_fiq_handler(void *start, unsigned int length);
 extern void enable_fiq(int fiq);
 extern void disable_fiq(int fiq);
+extern void eoi_fiq(int fiq);
 
 /* helpers defined in fiqasm.S: */
 extern void __set_fiq_regs(unsigned long const *regs);
diff --git a/arch/arm/kernel/fiq.c b/arch/arm/kernel/fiq.c
index 918875d..defbe85 100644
--- a/arch/arm/kernel/fiq.c
+++ b/arch/arm/kernel/fiq.c
@@ -40,6 +40,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/seq_file.h>
+#include <linux/irq.h>
 
 #include <asm/cacheflush.h>
 #include <asm/cp15.h>
@@ -139,6 +140,15 @@ void disable_fiq(int fiq)
 	disable_irq(fiq + fiq_start);
 }
 
+void eoi_fiq(int fiq)
+{
+	struct irq_data *irq_data = irq_get_irq_data(fiq + fiq_start);
+	struct irq_chip *chip = irq_data_get_irq_chip(irq_data);
+
+	if (chip->irq_eoi)
+			chip->irq_eoi(irq_data);
+}
+
 EXPORT_SYMBOL(set_fiq_handler);
 EXPORT_SYMBOL(__set_fiq_regs);	/* defined in fiqasm.S */
 EXPORT_SYMBOL(__get_fiq_regs);	/* defined in fiqasm.S */
@@ -146,6 +156,7 @@ EXPORT_SYMBOL(claim_fiq);
 EXPORT_SYMBOL(release_fiq);
 EXPORT_SYMBOL(enable_fiq);
 EXPORT_SYMBOL(disable_fiq);
+EXPORT_SYMBOL(eoi_fiq);
 
 void __init init_FIQ(int start)
 {
-- 
1.9.0