projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |