include/asm-mips/irq.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994 by Waldorf GMBH, written by Ralf Baechle
   7  * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle
   8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9  * Copyright (C) 2001 Kanoj Sarcar
  10  */
  11 #ifndef _ASM_IRQ_H
  12 #define _ASM_IRQ_H
  13
  14 #include <linux/config.h>
  15 #include <linux/linkage.h>
  16 #include <asm/sn/arch.h>
  17
  18 #ifdef CONFIG_SGI_IP27
  19
  20 #define NR_IRQS 256
  21
  22 /*
  23  * Number of levels in INT_PEND0. Can be set to 128 if we also
  24  * consider INT_PEND1.
  25  */
  26 #define PERNODE_LEVELS  64
  27
  28 extern int node_level_to_irq[MAX_COMPACT_NODES][PERNODE_LEVELS];
  29
  30 /*
  31  * we need to map irq's up to at least bit 7 of the INT_MASK0_A register
  32  * since bits 0-6 are pre-allocated for other purposes.
  33  */
  34 #define LEAST_LEVEL     7
  35 #define FAST_IRQ_TO_LEVEL(i)    ((i) + LEAST_LEVEL)
  36 #define LEVEL_TO_IRQ(c, l) \
  37                         (node_level_to_irq[CPUID_TO_COMPACT_NODEID(c)][(l)])
  38
  39 #else
  40
  41 /*
  42  * Largest number of ints of all machines except IP27
  43  */
  44 #define NR_IRQS 128
  45
  46 #endif
  47
  48 #ifdef CONFIG_I8259
  49 static inline int irq_canonicalize(int irq)
  50 {
  51         return ((irq == 2) ? 9 : irq);
  52 }
  53 #else
  54 #define irq_canonicalize(irq) (irq)     /* Sane hardware, sane code ... */
  55 #endif
  56
  57 extern void disable_irq(unsigned int);
  58 extern void disable_irq_nosync(unsigned int);
  59 extern void enable_irq(unsigned int);
  60
  61 struct pt_regs;
  62 extern asmlinkage unsigned int do_IRQ(int irq, struct pt_regs *regs);
  63
  64 /* Machine specific interrupt initialization  */
  65 extern void (*irq_setup)(void);
  66
  67 extern void init_generic_irq(void);
  68
  69 #endif /* _ASM_IRQ_H */