linux/arch/arm/include/asm/mach/irq.h
Will Deacon 10a8c38398 ARM: 6806/1: irq: introduce entry and exit functions for chained handlers
Some chained IRQ handlers are written to cope with primary chips of
potentially different flow types. Whether this a sensible thing to do
is a point of contention.

This patch introduces entry/exit functions for chained handlers which
infer the flow type of the primary chip as fasteoi or level-type by
checking whether or not the ->irq_eoi function pointer is present and
calling back to the primary chip as necessary. Other methods of flow
control are not considered.

Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-03-15 09:42:28 +00:00

68 lines
1.5 KiB
C

/*
* arch/arm/include/asm/mach/irq.h
*
* Copyright (C) 1995-2000 Russell King.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_ARM_MACH_IRQ_H
#define __ASM_ARM_MACH_IRQ_H
#include <linux/irq.h>
struct seq_file;
/*
* This is internal. Do not use it.
*/
extern void init_FIQ(void);
extern int show_fiq_list(struct seq_file *, int);
#ifdef CONFIG_MULTI_IRQ_HANDLER
extern void (*handle_arch_irq)(struct pt_regs *);
#endif
/*
* This is for easy migration, but should be changed in the source
*/
#define do_bad_IRQ(irq,desc) \
do { \
raw_spin_lock(&desc->lock); \
handle_bad_irq(irq, desc); \
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