Merge ../linux-2.6-watchdog-mm
[pandora-kernel.git] / 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 #ifdef CONFIG_MIPS_MT_SMTC
28 /*
29  * Clear interrupt mask handling "backstop" if irq_hwmask
30  * entry so indicates. This implies that the ack() or end()
31  * functions will take over re-enabling the low-level mask.
32  * Otherwise it will be done on return from exception.
33  */
34 #define __DO_IRQ_SMTC_HOOK(irq)                                         \
35 do {                                                                    \
36         if (irq_hwmask[irq] & 0x0000ff00)                               \
37                 write_c0_tccontext(read_c0_tccontext() &                \
38                                    ~(irq_hwmask[irq] & 0x0000ff00));    \
39 } while (0)
40 #else
41 #define __DO_IRQ_SMTC_HOOK(irq) do { } while (0)
42 #endif
43
44 /*
45  * do_IRQ handles all normal device IRQ's (the special
46  * SMP cross-CPU interrupts have their own specific
47  * handlers).
48  *
49  * Ideally there should be away to get this into kernel/irq/handle.c to
50  * avoid the overhead of a call for just a tiny function ...
51  */
52 #define do_IRQ(irq)                                                     \
53 do {                                                                    \
54         irq_enter();                                                    \
55         __DO_IRQ_SMTC_HOOK(irq);                                        \
56         generic_handle_irq(irq);                                        \
57         irq_exit();                                                     \
58 } while (0)
59
60 extern void arch_init_irq(void);
61 extern void spurious_interrupt(void);
62
63 #ifdef CONFIG_MIPS_MT_SMTC
64 struct irqaction;
65
66 extern unsigned long irq_hwmask[];
67 extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
68                           unsigned long hwmask);
69 #endif /* CONFIG_MIPS_MT_SMTC */
70
71 extern int allocate_irqno(void);
72 extern void alloc_legacy_irqno(void);
73 extern void free_irqno(unsigned int irq);
74
75 #endif /* _ASM_IRQ_H */