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Tip revision: 2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e authored by Linus Torvalds on 16 September 2017, 22:47:51 UTC
Linux 4.14-rc1
Linux 4.14-rc1
Tip revision: 2bd6bf0
csrc-ioasic.c
/*
* DEC I/O ASIC's counter clocksource
*
* Copyright (C) 2008 Yoichi Yuasa <yuasa@linux-mips.org>
*
* 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.
*
* 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.
*/
#include <linux/clocksource.h>
#include <linux/sched_clock.h>
#include <linux/init.h>
#include <asm/ds1287.h>
#include <asm/time.h>
#include <asm/dec/ioasic.h>
#include <asm/dec/ioasic_addrs.h>
static u64 dec_ioasic_hpt_read(struct clocksource *cs)
{
return ioasic_read(IO_REG_FCTR);
}
static struct clocksource clocksource_dec = {
.name = "dec-ioasic",
.read = dec_ioasic_hpt_read,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static u64 notrace dec_ioasic_read_sched_clock(void)
{
return ioasic_read(IO_REG_FCTR);
}
int __init dec_ioasic_clocksource_init(void)
{
unsigned int freq;
u32 start, end;
int i = HZ / 8;
ds1287_timer_state();
while (!ds1287_timer_state())
;
start = dec_ioasic_hpt_read(&clocksource_dec);
while (i--)
while (!ds1287_timer_state())
;
end = dec_ioasic_hpt_read(&clocksource_dec);
freq = (end - start) * 8;
/* An early revision of the I/O ASIC didn't have the counter. */
if (!freq)
return -ENXIO;
printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq);
clocksource_dec.rating = 200 + freq / 10000000;
clocksource_register_hz(&clocksource_dec, freq);
sched_clock_register(dec_ioasic_read_sched_clock, 32, freq);
return 0;
}