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1da177e4 LT |
1 | /* tick14.c |
2 | * linux/arch/sparc/kernel/tick14.c | |
3 | * | |
4 | * Copyright (C) 1996 David Redman (djhr@tadpole.co.uk) | |
5 | * | |
6 | * This file handles the Sparc specific level14 ticker | |
7 | * This is really useful for profiling OBP uses it for keyboard | |
8 | * aborts and other stuff. | |
9 | * | |
10 | * | |
11 | */ | |
12 | #include <linux/errno.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/param.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/timex.h> | |
19 | #include <linux/interrupt.h> | |
20 | ||
21 | #include <asm/oplib.h> | |
1da177e4 LT |
22 | #include <asm/timer.h> |
23 | #include <asm/mostek.h> | |
24 | #include <asm/system.h> | |
25 | #include <asm/irq.h> | |
26 | #include <asm/io.h> | |
27 | ||
28 | extern unsigned long lvl14_save[5]; | |
29 | static unsigned long *linux_lvl14 = NULL; | |
30 | static unsigned long obp_lvl14[4]; | |
31 | ||
32 | /* | |
33 | * Call with timer IRQ closed. | |
34 | * First time we do it with disable_irq, later prom code uses spin_lock_irq(). | |
35 | */ | |
36 | void install_linux_ticker(void) | |
37 | { | |
38 | ||
39 | if (!linux_lvl14) | |
40 | return; | |
41 | linux_lvl14[0] = lvl14_save[0]; | |
42 | linux_lvl14[1] = lvl14_save[1]; | |
43 | linux_lvl14[2] = lvl14_save[2]; | |
44 | linux_lvl14[3] = lvl14_save[3]; | |
45 | } | |
46 | ||
47 | void install_obp_ticker(void) | |
48 | { | |
49 | ||
50 | if (!linux_lvl14) | |
51 | return; | |
52 | linux_lvl14[0] = obp_lvl14[0]; | |
53 | linux_lvl14[1] = obp_lvl14[1]; | |
54 | linux_lvl14[2] = obp_lvl14[2]; | |
55 | linux_lvl14[3] = obp_lvl14[3]; | |
56 | } | |
57 | ||
0d84438d | 58 | void claim_ticker14(irqreturn_t (*handler)(int, void *), |
1da177e4 LT |
59 | int irq_nr, unsigned int timeout ) |
60 | { | |
61 | int cpu = smp_processor_id(); | |
62 | ||
63 | /* first we copy the obp handler instructions | |
64 | */ | |
65 | disable_irq(irq_nr); | |
66 | if (!handler) | |
67 | return; | |
68 | ||
69 | linux_lvl14 = (unsigned long *)lvl14_save[4]; | |
70 | obp_lvl14[0] = linux_lvl14[0]; | |
71 | obp_lvl14[1] = linux_lvl14[1]; | |
72 | obp_lvl14[2] = linux_lvl14[2]; | |
73 | obp_lvl14[3] = linux_lvl14[3]; | |
74 | ||
75 | if (!request_irq(irq_nr, | |
76 | handler, | |
67413202 | 77 | (IRQF_DISABLED | SA_STATIC_ALLOC), |
1da177e4 LT |
78 | "counter14", |
79 | NULL)) { | |
80 | install_linux_ticker(); | |
81 | load_profile_irq(cpu, timeout); | |
82 | enable_irq(irq_nr); | |
83 | } | |
84 | } |