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1097c6ac YY |
1 | /* |
2 | * Cobalt time initialization. | |
3 | * | |
4 | * Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | #include <linux/init.h> | |
21 | ||
22 | #include <asm/gt64120.h> | |
23 | #include <asm/i8253.h> | |
24 | #include <asm/time.h> | |
25 | ||
26 | #define GT641XX_BASE_CLOCK 50000000 /* 50MHz */ | |
27 | ||
28 | void __init plat_time_init(void) | |
29 | { | |
18ca38d2 YY |
30 | u32 start, end; |
31 | int i = HZ / 10; | |
32 | ||
1097c6ac YY |
33 | setup_pit_timer(); |
34 | ||
35 | gt641xx_set_base_clock(GT641XX_BASE_CLOCK); | |
36 | ||
18ca38d2 YY |
37 | /* |
38 | * MIPS counter frequency is measured during a 100msec interval | |
39 | * using GT64111 timer0. | |
40 | */ | |
41 | while (!gt641xx_timer0_state()) | |
42 | ; | |
43 | ||
44 | start = read_c0_count(); | |
45 | ||
46 | while (i--) | |
47 | while (!gt641xx_timer0_state()) | |
48 | ; | |
49 | ||
50 | end = read_c0_count(); | |
51 | ||
52 | mips_hpt_frequency = (end - start) * 10; | |
53 | printk(KERN_INFO "MIPS counter frequency %dHz\n", mips_hpt_frequency); | |
1097c6ac | 54 | } |