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