e292ccde21
CPUFreq driver need external timer, so add hpet at first. In Loongson 3, only Core-0 can receive external interrupt. As a result, timekeeping cannot absolutely use HPET timer. We use a hybrid solution: Core-0 use HPET as its clock event device, but other cores still use MIPS; clock source is global and doesn't need interrupt, so use HPET. Signed-off-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Hongliang Tao <taohl@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/8329/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
37 lines
900 B
C
37 lines
900 B
C
/*
|
|
* Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
|
|
* Author: Fuxin Zhang, zhangfx@lemote.com
|
|
*
|
|
* Copyright (C) 2009 Lemote Inc.
|
|
* Author: Wu Zhangjin, wuzhangjin@gmail.com
|
|
*
|
|
* 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; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
#include <asm/mc146818-time.h>
|
|
#include <asm/time.h>
|
|
#include <asm/hpet.h>
|
|
|
|
#include <loongson.h>
|
|
#include <cs5536/cs5536_mfgpt.h>
|
|
|
|
void __init plat_time_init(void)
|
|
{
|
|
/* setup mips r4k timer */
|
|
mips_hpt_frequency = cpu_clock_freq / 2;
|
|
|
|
#ifdef CONFIG_RS780_HPET
|
|
setup_hpet_timer();
|
|
#else
|
|
setup_mfgpt0_timer();
|
|
#endif
|
|
}
|
|
|
|
void read_persistent_clock(struct timespec *ts)
|
|
{
|
|
ts->tv_sec = mc146818_get_cmos_time();
|
|
ts->tv_nsec = 0;
|
|
}
|