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/*-
* Copyright (c) 2005, 2009-2011 Marcel Moolenaar
* 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 ``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 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <sys/priority.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/timeet.h>
#include <sys/timetc.h>
#include <sys/pcpu.h>
#include <machine/cpu.h>
#include <machine/efi.h>
#include <machine/intr.h>
#include <machine/intrcnt.h>
#include <machine/md_var.h>
#include <machine/smp.h>
#define CLOCK_ET_OFF 0
#define CLOCK_ET_PERIODIC 1
#define CLOCK_ET_ONESHOT 2
static struct eventtimer ia64_clock_et;
static u_int ia64_clock_xiv;
#ifndef SMP
static timecounter_get_t ia64_get_timecount;
static struct timecounter ia64_timecounter = {
ia64_get_timecount, /* get_timecount */
0, /* no poll_pps */
~0u, /* counter_mask */
0, /* frequency */
"ITC" /* name */
};
static u_int
ia64_get_timecount(struct timecounter* tc)
{
return ia64_get_itc();
}
#endif
static u_int
ia64_ih_clock(struct thread *td, u_int xiv, struct trapframe *tf)
{
struct eventtimer *et;
uint64_t itc, load;
uint32_t mode;
PCPU_INC(md.stats.pcs_nclks);
intrcnt[INTRCNT_CLOCK]++;
itc = ia64_get_itc();
PCPU_SET(md.clock, itc);
mode = PCPU_GET(md.clock_mode);
if (mode == CLOCK_ET_PERIODIC) {
load = PCPU_GET(md.clock_load);
ia64_set_itm(itc + load);
} else
ia64_set_itv((1 << 16) | xiv);
ia64_set_eoi(0);
ia64_srlz_d();
et = &ia64_clock_et;
if (et->et_active)
et->et_event_cb(et, et->et_arg);
return (1);
}
/*
* Event timer start method.
*/
static int
ia64_clock_start(struct eventtimer *et, struct bintime *first,
struct bintime *period)
{
u_long itc, load;
register_t is;
if (period != NULL) {
PCPU_SET(md.clock_mode, CLOCK_ET_PERIODIC);
load = (et->et_frequency * (period->frac >> 32)) >> 32;
if (period->sec > 0)
load += et->et_frequency * period->sec;
} else {
PCPU_SET(md.clock_mode, CLOCK_ET_ONESHOT);
load = 0;
}
PCPU_SET(md.clock_load, load);
if (first != NULL) {
load = (et->et_frequency * (first->frac >> 32)) >> 32;
if (first->sec > 0)
load += et->et_frequency * first->sec;
}
is = intr_disable();
itc = ia64_get_itc();
ia64_set_itm(itc + load);
ia64_set_itv(ia64_clock_xiv);
ia64_srlz_d();
intr_restore(is);
return (0);
}
/*
* Event timer stop method.
*/
static int
ia64_clock_stop(struct eventtimer *et)
{
ia64_set_itv((1 << 16) | ia64_clock_xiv);
ia64_srlz_d();
PCPU_SET(md.clock_mode, CLOCK_ET_OFF);
PCPU_SET(md.clock_load, 0);
return (0);
}
/*
* We call cpu_initclocks() on the APs as well. It allows us to
* group common initialization in the same function.
*/
void
cpu_initclocks()
{
ia64_clock_stop(NULL);
if (PCPU_GET(cpuid) == 0)
cpu_initclocks_bsp();
else
cpu_initclocks_ap();
}
static void
clock_configure(void *dummy)
{
struct eventtimer *et;
u_long itc_freq;
ia64_clock_xiv = ia64_xiv_alloc(PI_REALTIME, IA64_XIV_IPI,
ia64_ih_clock);
if (ia64_clock_xiv == 0)
panic("No XIV for clock interrupts");
itc_freq = (u_long)ia64_itc_freq() * 1000000ul;
et = &ia64_clock_et;
et->et_name = "ITC";
et->et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT | ET_FLAGS_PERCPU;
et->et_quality = 1000;
et->et_frequency = itc_freq;
et->et_min_period.sec = 0;
et->et_min_period.frac = (0x8000000000000000ul / (u_long)(10*hz)) << 1;
et->et_max_period.sec = 0xffffffff;
et->et_max_period.frac = ((0xfffffffeul << 32) / itc_freq) << 32;
et->et_start = ia64_clock_start;
et->et_stop = ia64_clock_stop;
et->et_priv = NULL;
et_register(et);
#ifndef SMP
ia64_timecounter.tc_frequency = itc_freq;
tc_init(&ia64_timecounter);
#endif
}
SYSINIT(clkcfg, SI_SUB_CONFIGURE, SI_ORDER_SECOND, clock_configure, NULL);
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