62 строки
1.9 KiB
C
62 строки
1.9 KiB
C
/*
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* SH-Mobile Timer
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*
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* Copyright (C) 2010 Magnus Damm
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* Copyright (C) 2002 - 2009 Paul Mundt
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/platform_device.h>
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#include <linux/clocksource.h>
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#include <linux/delay.h>
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void __init shmobile_setup_delay(unsigned int max_cpu_core_mhz,
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unsigned int mult, unsigned int div)
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{
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/* calculate a worst-case loops-per-jiffy value
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* based on maximum cpu core mhz setting and the
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* __delay() implementation in arch/arm/lib/delay.S
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*
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* this will result in a longer delay than expected
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* when the cpu core runs on lower frequencies.
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*/
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unsigned int value = (1000000 * mult) / (HZ * div);
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if (!preset_lpj)
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preset_lpj = max_cpu_core_mhz * value;
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}
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static void __init shmobile_late_time_init(void)
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{
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/*
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* Make sure all compiled-in early timers register themselves.
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*
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* Run probe() for two "earlytimer" devices, these will be the
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* clockevents and clocksource devices respectively. In the event
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* that only a clockevents device is available, we -ENODEV on the
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* clocksource and the jiffies clocksource is used transparently
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* instead. No error handling is necessary here.
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*/
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early_platform_driver_register_all("earlytimer");
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early_platform_driver_probe("earlytimer", 2, 0);
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}
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void __init shmobile_earlytimer_init(void)
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{
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late_time_init = shmobile_late_time_init;
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}
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