arm: Move chained_irq_(enter|exit) to a generic file

These functions have been introduced by commit 10a8c383 (irq: introduce
entry and exit functions for chained handlers) in asm/mach/irq.h. This
patch moves them to linux/irqchip/chained_irq.h so that generic irqchip
drivers do not rely on architecture specific header files.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Herring <rob.herring@calxeda.com>

arch/arm/include/asm/mach/irq.h

@@ -30,35 +30,4 @@ do {							\
 	raw_spin_unlock(&desc->lock);			\
 } while(0)
 
-#ifndef __ASSEMBLY__
-/*
- * Entry/exit functions for chained handlers where the primary IRQ chip
- * may implement either fasteoi or level-trigger flow control.
- */
-static inline void chained_irq_enter(struct irq_chip *chip,
-				     struct irq_desc *desc)
-{
-	/* FastEOI controllers require no action on entry. */
-	if (chip->irq_eoi)
-		return;
-
-	if (chip->irq_mask_ack) {
-		chip->irq_mask_ack(&desc->irq_data);
-	} else {
-		chip->irq_mask(&desc->irq_data);
-		if (chip->irq_ack)
-			chip->irq_ack(&desc->irq_data);
-	}
-}
-
-static inline void chained_irq_exit(struct irq_chip *chip,
-				    struct irq_desc *desc)
-{
-	if (chip->irq_eoi)
-		chip->irq_eoi(&desc->irq_data);
-	else
-		chip->irq_unmask(&desc->irq_data);
-}
-#endif
-
 #endif

arch/arm/mach-at91/gpio.c

@@ -22,10 +22,9 @@
 #include <linux/module.h>
 #include <linux/io.h>
 #include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
 #include <linux/of_address.h>
 
-#include <asm/mach/irq.h>
-
 #include <mach/hardware.h>
 #include <mach/at91_pio.h>
 

arch/arm/mach-exynos/common.c

@@ -26,6 +26,7 @@
 #include <linux/irqchip.h>
 #include <linux/of_address.h>
 #include <linux/irqchip/arm-gic.h>
+#include <linux/irqchip/chained_irq.h>
 
 #include <asm/proc-fns.h>
 #include <asm/exception.h>

arch/arm/mach-s3c24xx/irq.c

@@ -25,6 +25,7 @@
 #include <linux/ioport.h>
 #include <linux/device.h>
 #include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
 
 #include <asm/mach/irq.h>
 

arch/arm/plat-samsung/irq-vic-timer.c

@@ -16,6 +16,7 @@
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
 #include <linux/io.h>
 
 #include <mach/map.h>
@@ -23,8 +24,6 @@
 #include <plat/irq-vic-timer.h>
 #include <plat/regs-timer.h>
 
-#include <asm/mach/irq.h>
-
 static void s3c_irq_demux_vic_timer(unsigned int irq, struct irq_desc *desc)
 {
 	struct irq_chip *chip = irq_get_chip(irq);

arch/arm/plat-samsung/s5p-irq-gpioint.c

@@ -14,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
 #include <linux/io.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>
@@ -22,8 +23,6 @@
 #include <plat/gpio-core.h>
 #include <plat/gpio-cfg.h>
 
-#include <asm/mach/irq.h>
-
 #define GPIO_BASE(chip)		((void __iomem *)((unsigned long)((chip)->base) & 0xFFFFF000u))
 
 #define CON_OFFSET		0x700