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