Merge branch 'fixes-jgarzik' of git://git.kernel.org/pub/scm/linux/kernel/git/linvill...
[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 == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 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 struct irqaction;
30
31 extern unsigned long irq_hwmask[];
32 extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
33                           unsigned long hwmask);
34
35 static inline void smtc_im_ack_irq(unsigned int irq)
36 {
37         if (irq_hwmask[irq] & ST0_IM)
38                 set_c0_status(irq_hwmask[irq] & ST0_IM);
39 }
40
41 #else
42
43 static inline void smtc_im_ack_irq(unsigned int irq)
44 {
45 }
46
47 #endif /* CONFIG_MIPS_MT_SMTC */
48
49 #ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
50
51 /*
52  * Clear interrupt mask handling "backstop" if irq_hwmask
53  * entry so indicates. This implies that the ack() or end()
54  * functions will take over re-enabling the low-level mask.
55  * Otherwise it will be done on return from exception.
56  */
57 #define __DO_IRQ_SMTC_HOOK(irq)                                         \
58 do {                                                                    \
59         if (irq_hwmask[irq] & 0x0000ff00)                               \
60                 write_c0_tccontext(read_c0_tccontext() &                \
61                                    ~(irq_hwmask[irq] & 0x0000ff00));    \
62 } while (0)
63 #else
64
65 #define __DO_IRQ_SMTC_HOOK(irq) do { } while (0)
66 #endif
67
68 /*
69  * do_IRQ handles all normal device IRQ's (the special
70  * SMP cross-CPU interrupts have their own specific
71  * handlers).
72  *
73  * Ideally there should be away to get this into kernel/irq/handle.c to
74  * avoid the overhead of a call for just a tiny function ...
75  */
76 #define do_IRQ(irq)                                                     \
77 do {                                                                    \
78         irq_enter();                                                    \
79         __DO_IRQ_SMTC_HOOK(irq);                                        \
80         generic_handle_irq(irq);                                        \
81         irq_exit();                                                     \
82 } while (0)
83
84 extern void arch_init_irq(void);
85 extern void spurious_interrupt(void);
86
87 extern int allocate_irqno(void);
88 extern void alloc_legacy_irqno(void);
89 extern void free_irqno(unsigned int irq);
90
91 /*
92  * Before R2 the timer and performance counter interrupts were both fixed to
93  * IE7.  Since R2 their number has to be read from the c0_intctl register.
94  */
95 #define CP0_LEGACY_COMPARE_IRQ 7
96
97 extern int cp0_compare_irq;
98 extern int cp0_perfcount_irq;
99
100 #endif /* _ASM_IRQ_H */