mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 10:14:23 +08:00
a5a1d1c291
There is no point in having an extra type for extra confusion. u64 is unambiguous. Conversion was done with the following coccinelle script: @rem@ @@ -typedef u64 cycle_t; @fix@ typedef cycle_t; @@ -cycle_t +u64 Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: John Stultz <john.stultz@linaro.org>
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*
|
|
* Port on Texas Instruments TMS320C6x architecture
|
|
*
|
|
* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
|
|
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/clocksource.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/param.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/profile.h>
|
|
|
|
#include <asm/special_insns.h>
|
|
#include <asm/timer64.h>
|
|
|
|
static u32 sched_clock_multiplier;
|
|
#define SCHED_CLOCK_SHIFT 16
|
|
|
|
static u64 tsc_read(struct clocksource *cs)
|
|
{
|
|
return get_cycles();
|
|
}
|
|
|
|
static struct clocksource clocksource_tsc = {
|
|
.name = "timestamp",
|
|
.rating = 300,
|
|
.read = tsc_read,
|
|
.mask = CLOCKSOURCE_MASK(64),
|
|
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
|
|
};
|
|
|
|
/*
|
|
* scheduler clock - returns current time in nanoseconds.
|
|
*/
|
|
u64 sched_clock(void)
|
|
{
|
|
u64 tsc = get_cycles();
|
|
|
|
return (tsc * sched_clock_multiplier) >> SCHED_CLOCK_SHIFT;
|
|
}
|
|
|
|
void __init time_init(void)
|
|
{
|
|
u64 tmp = (u64)NSEC_PER_SEC << SCHED_CLOCK_SHIFT;
|
|
|
|
do_div(tmp, c6x_core_freq);
|
|
sched_clock_multiplier = tmp;
|
|
|
|
clocksource_register_hz(&clocksource_tsc, c6x_core_freq);
|
|
|
|
/* write anything into TSCL to enable counting */
|
|
set_creg(TSCL, 0);
|
|
|
|
/* probe for timer64 event timer */
|
|
timer64_init();
|
|
}
|