Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[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 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 */