Contributors: 4
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Aurelien Jacquiot |
161 |
95.83% |
1 |
20.00% |
| Thomas Gleixner |
3 |
1.79% |
2 |
40.00% |
| David Howells |
3 |
1.79% |
1 |
20.00% |
| Nishanth Menon |
1 |
0.60% |
1 |
20.00% |
| Total |
168 |
|
5 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Port on Texas Instruments TMS320C6x architecture
*
* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
*/
#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();
}