timer.c

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/*
 * 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/delay.h>
#include <asm/mach/time.h>
#include <asm/smp_twd.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;
}

static void __init shmobile_timer_init(void)
{
}

struct sys_timer shmobile_timer = {
    .init       = shmobile_timer_init,
};