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