Commit | Line | Data |
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022c03a2 MZ |
1 | /* |
2 | * linux/arch/arm/kernel/arch_timer.c | |
3 | * | |
4 | * Copyright (C) 2011 ARM Ltd. | |
5 | * All Rights Reserved | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/init.h> | |
8a4da6e3 | 12 | #include <linux/types.h> |
fe7dc720 | 13 | #include <linux/errno.h> |
022c03a2 | 14 | |
56942fec | 15 | #include <asm/delay.h> |
3f61c80e | 16 | #include <asm/sched_clock.h> |
022c03a2 | 17 | |
8a4da6e3 | 18 | #include <clocksource/arm_arch_timer.h> |
f48b5f12 | 19 | |
8a4da6e3 | 20 | static unsigned long arch_timer_read_counter_long(void) |
022c03a2 | 21 | { |
b8e24343 | 22 | return arch_timer_read_counter(); |
022c03a2 MZ |
23 | } |
24 | ||
8a4da6e3 | 25 | static u32 arch_timer_read_counter_u32(void) |
923df96b | 26 | { |
b8e24343 | 27 | return arch_timer_read_counter(); |
923df96b WD |
28 | } |
29 | ||
8a4da6e3 | 30 | static struct delay_timer arch_delay_timer; |
273d16ad | 31 | |
8a4da6e3 | 32 | static void __init arch_timer_delay_timer_register(void) |
022c03a2 | 33 | { |
56942fec | 34 | /* Use the architected timer for the delay loop. */ |
8a4da6e3 MR |
35 | arch_delay_timer.read_current_timer = arch_timer_read_counter_long; |
36 | arch_delay_timer.freq = arch_timer_get_rate(); | |
56942fec | 37 | register_current_timer_delay(&arch_delay_timer); |
022c03a2 | 38 | } |
3f61c80e | 39 | |
0075242b MZ |
40 | int __init arch_timer_of_register(void) |
41 | { | |
8a4da6e3 | 42 | int ret; |
0075242b | 43 | |
8a4da6e3 MR |
44 | ret = arch_timer_init(); |
45 | if (ret) | |
46 | return ret; | |
0075242b | 47 | |
8a4da6e3 | 48 | arch_timer_delay_timer_register(); |
f48b5f12 | 49 | |
8a4da6e3 | 50 | return 0; |
0075242b | 51 | } |
0075242b | 52 | |
3f61c80e MZ |
53 | int __init arch_timer_sched_clock_init(void) |
54 | { | |
8a4da6e3 MR |
55 | if (arch_timer_get_rate() == 0) |
56 | return -ENXIO; | |
3f61c80e | 57 | |
8a4da6e3 MR |
58 | setup_sched_clock(arch_timer_read_counter_u32, |
59 | 32, arch_timer_get_rate()); | |
3f61c80e MZ |
60 | return 0; |
61 | } |