/* *  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 cycle_t 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 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();}