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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2003 Ralf Baechle | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the | |
6 | * Free Software Foundation; either version 2 of the License, or (at your | |
7 | * option) any later version. | |
8 | * | |
9 | * Handler for RM7000 extended interrupts. These are a non-standard | |
10 | * feature so we handle them separately from standard interrupts. | |
11 | */ | |
12 | #include <linux/init.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/kernel.h> | |
15 | ||
16 | #include <asm/irq_cpu.h> | |
17 | #include <asm/mipsregs.h> | |
18 | #include <asm/system.h> | |
19 | ||
20 | static int irq_base; | |
21 | ||
22 | static inline void unmask_rm7k_irq(unsigned int irq) | |
23 | { | |
24 | set_c0_intcontrol(0x100 << (irq - irq_base)); | |
25 | } | |
26 | ||
27 | static inline void mask_rm7k_irq(unsigned int irq) | |
28 | { | |
29 | clear_c0_intcontrol(0x100 << (irq - irq_base)); | |
30 | } | |
31 | ||
32 | static inline void rm7k_cpu_irq_enable(unsigned int irq) | |
33 | { | |
34 | unsigned long flags; | |
35 | ||
36 | local_irq_save(flags); | |
37 | unmask_rm7k_irq(irq); | |
38 | local_irq_restore(flags); | |
39 | } | |
40 | ||
41 | static void rm7k_cpu_irq_disable(unsigned int irq) | |
42 | { | |
43 | unsigned long flags; | |
44 | ||
45 | local_irq_save(flags); | |
46 | mask_rm7k_irq(irq); | |
47 | local_irq_restore(flags); | |
48 | } | |
49 | ||
50 | static unsigned int rm7k_cpu_irq_startup(unsigned int irq) | |
51 | { | |
52 | rm7k_cpu_irq_enable(irq); | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
57 | #define rm7k_cpu_irq_shutdown rm7k_cpu_irq_disable | |
58 | ||
59 | /* | |
60 | * While we ack the interrupt interrupts are disabled and thus we don't need | |
61 | * to deal with concurrency issues. Same for rm7k_cpu_irq_end. | |
62 | */ | |
63 | static void rm7k_cpu_irq_ack(unsigned int irq) | |
64 | { | |
65 | mask_rm7k_irq(irq); | |
66 | } | |
67 | ||
68 | static void rm7k_cpu_irq_end(unsigned int irq) | |
69 | { | |
70 | if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) | |
71 | unmask_rm7k_irq(irq); | |
72 | } | |
73 | ||
74 | static hw_irq_controller rm7k_irq_controller = { | |
75 | "RM7000", | |
76 | rm7k_cpu_irq_startup, | |
77 | rm7k_cpu_irq_shutdown, | |
78 | rm7k_cpu_irq_enable, | |
79 | rm7k_cpu_irq_disable, | |
80 | rm7k_cpu_irq_ack, | |
81 | rm7k_cpu_irq_end, | |
82 | }; | |
83 | ||
84 | void __init rm7k_cpu_irq_init(int base) | |
85 | { | |
86 | int i; | |
87 | ||
88 | clear_c0_intcontrol(0x00000f00); /* Mask all */ | |
89 | ||
90 | for (i = base; i < base + 4; i++) { | |
91 | irq_desc[i].status = IRQ_DISABLED; | |
92 | irq_desc[i].action = NULL; | |
93 | irq_desc[i].depth = 1; | |
94 | irq_desc[i].handler = &rm7k_irq_controller; | |
95 | } | |
96 | ||
97 | irq_base = base; | |
98 | } |