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, 03 by Ralf Baechle
   8  */
   9 #ifndef _ASM_IRQ_H
  10 #define _ASM_IRQ_H
  11
  12 #include <linux/linkage.h>
  13
  14 #include <asm/mipsmtregs.h>
  15
  16 #include <irq.h>
  17
  18 #ifdef CONFIG_I8259
  19 static inline int irq_canonicalize(int irq)
  20 {
  21         return ((irq == 2) ? 9 : irq);
  22 }
  23 #else
  24 #define irq_canonicalize(irq) (irq)     /* Sane hardware, sane code ... */
  25 #endif
  26
  27 struct pt_regs;
  28
  29 extern asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs);
  30
  31 #ifdef CONFIG_MIPS_MT_SMTC
  32 /*
  33  * Clear interrupt mask handling "backstop" if irq_hwmask
  34  * entry so indicates. This implies that the ack() or end()
  35  * functions will take over re-enabling the low-level mask.
  36  * Otherwise it will be done on return from exception.
  37  */
  38 #define __DO_IRQ_SMTC_HOOK()                                            \
  39 do {                                                                    \
  40         if (irq_hwmask[irq] & 0x0000ff00)                               \
  41                 write_c0_tccontext(read_c0_tccontext() &                \
  42                                    ~(irq_hwmask[irq] & 0x0000ff00));    \
  43 } while (0)
  44 #else
  45 #define __DO_IRQ_SMTC_HOOK() do { } while (0)
  46 #endif
  47
  48 #ifdef CONFIG_PREEMPT
  49
  50 /*
  51  * do_IRQ handles all normal device IRQ's (the special
  52  * SMP cross-CPU interrupts have their own specific
  53  * handlers).
  54  *
  55  * Ideally there should be away to get this into kernel/irq/handle.c to
  56  * avoid the overhead of a call for just a tiny function ...
  57  */
  58 #define do_IRQ(irq, regs)                                               \
  59 do {                                                                    \
  60         irq_enter();                                                    \
  61         __DO_IRQ_SMTC_HOOK();                                           \
  62         __do_IRQ((irq), (regs));                                        \
  63         irq_exit();                                                     \
  64 } while (0)
  65
  66 #endif
  67
  68 extern void arch_init_irq(void);
  69 extern void spurious_interrupt(struct pt_regs *regs);
  70
  71 #ifdef CONFIG_MIPS_MT_SMTC
  72 struct irqaction;
  73
  74 extern unsigned long irq_hwmask[];
  75 extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
  76                           unsigned long hwmask);
  77 #endif /* CONFIG_MIPS_MT_SMTC */
  78
  79 #ifdef CONFIG_SMP
  80 #define ARCH_HAS_IRQ_PER_CPU
  81 #endif
  82
  83 #endif /* _ASM_IRQ_H */