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