Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6] / 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 */