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/*-
* Copyright (c) 2006-2009 RMI Corporation
* Copyright (c) 2006 Bruce M. Simpson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Simple driver for the 32-bit interval counter built in to all
* MIPS32 CPUs.
* XXX: For calibration this either needs an external clock, or
* to be explicitly told what the frequency is.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/timetc.h>
#include <sys/kernel.h>
#include <sys/power.h>
#include <sys/smp.h>
#include <machine/clock.h>
#include <machine/locore.h>
#include <machine/md_var.h>
#include <machine/hwfunc.h>
struct timecounter counter_timecounter = {
platform_get_timecount, /* get_timecount */
0, /* no poll_pps */
~0u, /* counter_mask */
0, /* frequency */
"MIPS32", /* name */
800, /* quality (adjusted in code) */
};
void tick_init(void);
void
tick_init(void)
{
counter_freq = platform_get_frequency();
if (bootverbose)
printf("MIPS32 clock: %u MHz", cpu_clock);
counter_timecounter.tc_frequency = counter_freq;
tc_init(&counter_timecounter);
}
void
cpu_startprofclock(void)
{
/* nothing to do */
}
void
cpu_stopprofclock(void)
{
/* nothing to do */
}
static int
sysctl_machdep_counter_freq(SYSCTL_HANDLER_ARGS)
{
int error;
uint64_t freq;
/*
* RRS wonders if this will really work. You don't change the req of
* the system here, it would require changes to the RMI PIC in order
* to get the TC to run at a differrent frequency.
*/
if (counter_timecounter.tc_frequency == 0)
return (EOPNOTSUPP);
freq = counter_freq;
error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
if (error == 0 && req->newptr != NULL) {
counter_freq = freq;
counter_timecounter.tc_frequency = counter_freq;
}
return (error);
}
SYSCTL_PROC(_machdep, OID_AUTO, counter_freq, CTLTYPE_QUAD | CTLFLAG_RW,
0, sizeof(u_int), sysctl_machdep_counter_freq, "IU", "");
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