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c793c1b0 MD |
1 | /* |
2 | * SH-Mobile Timer | |
3 | * | |
4 | * Copyright (C) 2010 Magnus Damm | |
5 | * Copyright (C) 2002 - 2009 Paul Mundt | |
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 as published by | |
9 | * the Free Software Foundation; version 2 of the License. | |
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 St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | */ | |
21 | #include <linux/platform_device.h> | |
0583fe47 | 22 | #include <linux/clocksource.h> |
0f2c9f20 | 23 | #include <linux/delay.h> |
c793c1b0 | 24 | |
0f2c9f20 MD |
25 | void __init shmobile_setup_delay(unsigned int max_cpu_core_mhz, |
26 | unsigned int mult, unsigned int div) | |
27 | { | |
28 | /* calculate a worst-case loops-per-jiffy value | |
29 | * based on maximum cpu core mhz setting and the | |
30 | * __delay() implementation in arch/arm/lib/delay.S | |
31 | * | |
32 | * this will result in a longer delay than expected | |
33 | * when the cpu core runs on lower frequencies. | |
34 | */ | |
35 | ||
36 | unsigned int value = (1000000 * mult) / (HZ * div); | |
37 | ||
173bf69a MD |
38 | if (!preset_lpj) |
39 | preset_lpj = max_cpu_core_mhz * value; | |
0f2c9f20 MD |
40 | } |
41 | ||
c793c1b0 MD |
42 | static void __init shmobile_late_time_init(void) |
43 | { | |
44 | /* | |
45 | * Make sure all compiled-in early timers register themselves. | |
46 | * | |
47 | * Run probe() for two "earlytimer" devices, these will be the | |
48 | * clockevents and clocksource devices respectively. In the event | |
49 | * that only a clockevents device is available, we -ENODEV on the | |
50 | * clocksource and the jiffies clocksource is used transparently | |
51 | * instead. No error handling is necessary here. | |
52 | */ | |
53 | early_platform_driver_register_all("earlytimer"); | |
54 | early_platform_driver_probe("earlytimer", 2, 0); | |
55 | } | |
56 | ||
08ad42fb | 57 | void __init shmobile_earlytimer_init(void) |
c793c1b0 MD |
58 | { |
59 | late_time_init = shmobile_late_time_init; | |
60 | } | |
61 | ||
6bb27d73 | 62 | void __init shmobile_timer_init(void) |
08ad42fb | 63 | { |
0583fe47 | 64 | clocksource_of_init(); |
08ad42fb | 65 | } |