1 #ifndef __irq_h 2 #define __irq_h 3 4 /* 5 * Please do not include this file in generic code. There is currently 6 * no requirement for any architecture to implement anything held 7 * within this file. 8 * 9 * Thanks. --rmk 10 */ 11 12 #include <linux/config.h> 13 14 #if !defined(CONFIG_ARCH_S390) 15 16 #include <linux/linkage.h> 17 #include <linux/cache.h> 18 #include <linux/spinlock.h> 19 #include <linux/cpumask.h> 20 21 #include <asm/irq.h> 22 #include <asm/ptrace.h> 23 24 /* 25 * IRQ line status. 26 */ 27 #define IRQ_INPROGRESS 1 /* IRQ handler active - do not enter! */ 28 #define IRQ_DISABLED 2 /* IRQ disabled - do not enter! */ 29 #define IRQ_PENDING 4 /* IRQ pending - replay on enable */ 30 #define IRQ_REPLAY 8 /* IRQ has been replayed but not acked yet */ 31 #define IRQ_AUTODETECT 16 /* IRQ is being autodetected */ 32 #define IRQ_WAITING 32 /* IRQ not yet seen - for autodetection */ 33 #define IRQ_LEVEL 64 /* IRQ level triggered */ 34 #define IRQ_MASKED 128 /* IRQ masked - shouldn't be seen again */ 35 #define IRQ_PER_CPU 256 /* IRQ is per CPU */ 36 37 /* 38 * Interrupt controller descriptor. This is all we need 39 * to describe about the low-level hardware. 40 */ 41 struct hw_interrupt_type { 42 const char * typename; 43 unsigned int (*startup)(unsigned int irq); 44 void (*shutdown)(unsigned int irq); 45 void (*enable)(unsigned int irq); 46 void (*disable)(unsigned int irq); 47 void (*ack)(unsigned int irq); 48 void (*end)(unsigned int irq); 49 void (*set_affinity)(unsigned int irq, cpumask_t dest); 50 /* Currently used only by UML, might disappear one day.*/ 51 #ifdef CONFIG_IRQ_RELEASE_METHOD 52 void (*release)(unsigned int irq, void *dev_id); 53 #endif 54 }; 55 56 typedef struct hw_interrupt_type hw_irq_controller; 57 58 /* 59 * This is the "IRQ descriptor", which contains various information 60 * about the irq, including what kind of hardware handling it has, 61 * whether it is disabled etc etc. 62 * 63 * Pad this out to 32 bytes for cache and indexing reasons. 64 */ 65 typedef struct irq_desc { 66 hw_irq_controller *handler; 67 void *handler_data; 68 struct irqaction *action; /* IRQ action list */ 69 unsigned int status; /* IRQ status */ 70 unsigned int depth; /* nested irq disables */ 71 unsigned int irq_count; /* For detecting broken interrupts */ 72 unsigned int irqs_unhandled; 73 spinlock_t lock; 74 } ____cacheline_aligned irq_desc_t; 75 76 extern irq_desc_t irq_desc [NR_IRQS]; 77 78 #include <asm/hw_irq.h> /* the arch dependent stuff */ 79 80 extern int setup_irq(unsigned int irq, struct irqaction * new); 81 82 #ifdef CONFIG_GENERIC_HARDIRQS 83 extern cpumask_t irq_affinity[NR_IRQS]; 84 extern int no_irq_affinity; 85 extern int noirqdebug_setup(char *str); 86 87 extern fastcall int handle_IRQ_event(unsigned int irq, struct pt_regs *regs, 88 struct irqaction *action); 89 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs); 90 extern void note_interrupt(unsigned int irq, irq_desc_t *desc, int action_ret); 91 extern void report_bad_irq(unsigned int irq, irq_desc_t *desc, int action_ret); 92 extern int can_request_irq(unsigned int irq, unsigned long irqflags); 93 94 extern void init_irq_proc(void); 95 #endif 96 97 extern hw_irq_controller no_irq_type; /* needed in every arch ? */ 98 99 #endif 100 101 #endif /* __irq_h */ 102