diff options
Diffstat (limited to 'include/linux/irq.h')
| -rw-r--r-- | include/linux/irq.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h new file mode 100644 index 000000000000..c3ff4d101667 --- /dev/null +++ b/include/linux/irq.h @@ -0,0 +1,97 @@ +#ifndef __irq_h +#define __irq_h + +/* + * Please do not include this file in generic code. There is currently + * no requirement for any architecture to implement anything held + * within this file. + * + * Thanks. --rmk + */ + +#include <linux/config.h> + +#if !defined(CONFIG_ARCH_S390) + +#include <linux/linkage.h> +#include <linux/cache.h> +#include <linux/spinlock.h> +#include <linux/cpumask.h> + +#include <asm/irq.h> +#include <asm/ptrace.h> + +/* + * IRQ line status. + */ +#define IRQ_INPROGRESS 1 /* IRQ handler active - do not enter! */ +#define IRQ_DISABLED 2 /* IRQ disabled - do not enter! */ +#define IRQ_PENDING 4 /* IRQ pending - replay on enable */ +#define IRQ_REPLAY 8 /* IRQ has been replayed but not acked yet */ +#define IRQ_AUTODETECT 16 /* IRQ is being autodetected */ +#define IRQ_WAITING 32 /* IRQ not yet seen - for autodetection */ +#define IRQ_LEVEL 64 /* IRQ level triggered */ +#define IRQ_MASKED 128 /* IRQ masked - shouldn't be seen again */ +#define IRQ_PER_CPU 256 /* IRQ is per CPU */ + +/* + * Interrupt controller descriptor. This is all we need + * to describe about the low-level hardware. + */ +struct hw_interrupt_type { + const char * typename; + unsigned int (*startup)(unsigned int irq); + void (*shutdown)(unsigned int irq); + void (*enable)(unsigned int irq); + void (*disable)(unsigned int irq); + void (*ack)(unsigned int irq); + void (*end)(unsigned int irq); + void (*set_affinity)(unsigned int irq, cpumask_t dest); +}; + +typedef struct hw_interrupt_type hw_irq_controller; + +/* + * This is the "IRQ descriptor", which contains various information + * about the irq, including what kind of hardware handling it has, + * whether it is disabled etc etc. + * + * Pad this out to 32 bytes for cache and indexing reasons. + */ +typedef struct irq_desc { + hw_irq_controller *handler; + void *handler_data; + struct irqaction *action; /* IRQ action list */ + unsigned int status; /* IRQ status */ + unsigned int depth; /* nested irq disables */ + unsigned int irq_count; /* For detecting broken interrupts */ + unsigned int irqs_unhandled; + spinlock_t lock; +} ____cacheline_aligned irq_desc_t; + +extern irq_desc_t irq_desc [NR_IRQS]; + +#include <asm/hw_irq.h> /* the arch dependent stuff */ + +extern int setup_irq(unsigned int irq, struct irqaction * new); + +#ifdef CONFIG_GENERIC_HARDIRQS +extern cpumask_t irq_affinity[NR_IRQS]; +extern int no_irq_affinity; +extern int noirqdebug_setup(char *str); + +extern fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs, + struct irqaction *action); +extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs); +extern void note_interrupt(unsigned int irq, irq_desc_t *desc, int action_ret); +extern void report_bad_irq(unsigned int irq, irq_desc_t *desc, int action_ret); +extern int can_request_irq(unsigned int irq, unsigned long irqflags); + +extern void init_irq_proc(void); +#endif + +extern hw_irq_controller no_irq_type; /* needed in every arch ? */ + +#endif + +#endif /* __irq_h */ |