include/asm-ppc64/irq.h

   1 #ifdef __KERNEL__
   2 #ifndef _ASM_IRQ_H
   3 #define _ASM_IRQ_H
   4
   5 /*
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/threads.h>
  14
  15 /*
  16  * Maximum number of interrupt sources that we can handle.
  17  */
  18 #define NR_IRQS         512
  19
  20 /* this number is used when no interrupt has been assigned */
  21 #define NO_IRQ                  (-1)
  22
  23 /*
  24  * These constants are used for passing information about interrupt
  25  * signal polarity and level/edge sensing to the low-level PIC chip
  26  * drivers.
  27  */
  28 #define IRQ_SENSE_MASK          0x1
  29 #define IRQ_SENSE_LEVEL         0x1     /* interrupt on active level */
  30 #define IRQ_SENSE_EDGE          0x0     /* interrupt triggered by edge */
  31
  32 #define IRQ_POLARITY_MASK       0x2
  33 #define IRQ_POLARITY_POSITIVE   0x2     /* high level or low->high edge */
  34 #define IRQ_POLARITY_NEGATIVE   0x0     /* low level or high->low edge */
  35
  36 #define get_irq_desc(irq) (&irq_desc[(irq)])
  37
  38 /* Define a way to iterate across irqs. */
  39 #define for_each_irq(i) \
  40         for ((i) = 0; (i) < NR_IRQS; ++(i))
  41
  42 /* Interrupt numbers are virtual in case they are sparsely
  43  * distributed by the hardware.
  44  */
  45 extern unsigned int virt_irq_to_real_map[NR_IRQS];
  46
  47 /* Create a mapping for a real_irq if it doesn't already exist.
  48  * Return the virtual irq as a convenience.
  49  */
  50 int virt_irq_create_mapping(unsigned int real_irq);
  51 void virt_irq_init(void);
  52
  53 static inline unsigned int virt_irq_to_real(unsigned int virt_irq)
  54 {
  55         return virt_irq_to_real_map[virt_irq];
  56 }
  57
  58 extern unsigned int real_irq_to_virt_slowpath(unsigned int real_irq);
  59
  60 /*
  61  * Because many systems have two overlapping names spaces for
  62  * interrupts (ISA and XICS for example), and the ISA interrupts
  63  * have historically not been easy to renumber, we allow ISA
  64  * interrupts to take values 0 - 15, and shift up the remaining
  65  * interrupts by 0x10.
  66  */
  67 #define NUM_ISA_INTERRUPTS      0x10
  68 extern int __irq_offset_value;
  69
  70 static inline int irq_offset_up(int irq)
  71 {
  72         return(irq + __irq_offset_value);
  73 }
  74
  75 static inline int irq_offset_down(int irq)
  76 {
  77         return(irq - __irq_offset_value);
  78 }
  79
  80 static inline int irq_offset_value(void)
  81 {
  82         return __irq_offset_value;
  83 }
  84
  85 static __inline__ int irq_canonicalize(int irq)
  86 {
  87         return irq;
  88 }
  89
  90 extern int distribute_irqs;
  91
  92 struct irqaction;
  93 struct pt_regs;
  94
  95 #ifdef CONFIG_IRQSTACKS
  96 /*
  97  * Per-cpu stacks for handling hard and soft interrupts.
  98  */
  99 extern struct thread_info *hardirq_ctx[NR_CPUS];
 100 extern struct thread_info *softirq_ctx[NR_CPUS];
 101
 102 extern void irq_ctx_init(void);
 103 extern void call_do_softirq(struct thread_info *tp);
 104 extern int call_handle_IRQ_event(int irq, struct pt_regs *regs,
 105                         struct irqaction *action, struct thread_info *tp);
 106
 107 #define __ARCH_HAS_DO_SOFTIRQ
 108
 109 #else
 110 #define irq_ctx_init()
 111
 112 #endif /* CONFIG_IRQSTACKS */
 113
 114 #endif /* _ASM_IRQ_H */
 115 #endif /* __KERNEL__ */