49ed68bbf3
HPET to steal IRQ0 from i8254 and IRQ8 from RTC timers. It can be suitable for HPETs without FSB interrupts support, as it gives them two unshared IRQs. It allows them to provide one per-CPU event timer on dual-CPU system, that should be suitable for further tickless kernels. To enable it, such lines may be added to /boot/loader.conf: hint.atrtc.0.clock=0 hint.attimer.0.clock=0 hint.hpet.0.legacy_route=1
401 lines
10 KiB
C
401 lines
10 KiB
C
/*-
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* Copyright (c) 2008 Poul-Henning Kamp
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* Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org>
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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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_isa.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/clock.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/proc.h>
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#include <sys/rman.h>
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#include <sys/timeet.h>
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#include <isa/rtc.h>
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#ifdef DEV_ISA
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#include <isa/isareg.h>
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#include <isa/isavar.h>
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#endif
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#include <machine/intr_machdep.h>
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#include "clock_if.h"
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#define RTC_LOCK mtx_lock_spin(&clock_lock)
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#define RTC_UNLOCK mtx_unlock_spin(&clock_lock)
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int atrtcclock_disable = 0;
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static int rtc_reg = -1;
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static u_char rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF;
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static u_char rtc_statusb = RTCSB_24HR;
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/*
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* RTC support routines
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*/
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int
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rtcin(int reg)
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{
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u_char val;
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RTC_LOCK;
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if (rtc_reg != reg) {
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inb(0x84);
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outb(IO_RTC, reg);
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rtc_reg = reg;
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inb(0x84);
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}
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val = inb(IO_RTC + 1);
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RTC_UNLOCK;
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return (val);
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}
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void
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writertc(int reg, u_char val)
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{
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RTC_LOCK;
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if (rtc_reg != reg) {
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inb(0x84);
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outb(IO_RTC, reg);
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rtc_reg = reg;
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inb(0x84);
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}
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outb(IO_RTC + 1, val);
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inb(0x84);
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RTC_UNLOCK;
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}
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static __inline int
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readrtc(int port)
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{
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return(bcd2bin(rtcin(port)));
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}
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static void
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atrtc_start(void)
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{
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writertc(RTC_STATUSA, rtc_statusa);
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writertc(RTC_STATUSB, RTCSB_24HR);
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}
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static void
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atrtc_rate(unsigned rate)
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{
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rtc_statusa = RTCSA_DIVIDER | rate;
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writertc(RTC_STATUSA, rtc_statusa);
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}
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static void
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atrtc_enable_intr(void)
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{
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rtc_statusb |= RTCSB_PINTR;
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writertc(RTC_STATUSB, rtc_statusb);
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rtcin(RTC_INTR);
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}
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static void
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atrtc_disable_intr(void)
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{
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rtc_statusb &= ~RTCSB_PINTR;
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writertc(RTC_STATUSB, rtc_statusb);
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rtcin(RTC_INTR);
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}
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void
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atrtc_restore(void)
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{
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/* Restore all of the RTC's "status" (actually, control) registers. */
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rtcin(RTC_STATUSA); /* dummy to get rtc_reg set */
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writertc(RTC_STATUSB, RTCSB_24HR);
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writertc(RTC_STATUSA, rtc_statusa);
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writertc(RTC_STATUSB, rtc_statusb);
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rtcin(RTC_INTR);
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}
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/**********************************************************************
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* RTC driver for subr_rtc
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*/
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struct atrtc_softc {
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int port_rid, intr_rid;
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struct resource *port_res;
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struct resource *intr_res;
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void *intr_handler;
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struct eventtimer et;
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};
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static int
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rtc_start(struct eventtimer *et,
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struct bintime *first, struct bintime *period)
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{
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atrtc_rate(max(fls((period->frac + (period->frac >> 1)) >> 32) - 17, 1));
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atrtc_enable_intr();
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return (0);
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}
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static int
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rtc_stop(struct eventtimer *et)
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{
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atrtc_disable_intr();
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return (0);
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}
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/*
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* This routine receives statistical clock interrupts from the RTC.
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* As explained above, these occur at 128 interrupts per second.
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* When profiling, we receive interrupts at a rate of 1024 Hz.
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*
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* This does not actually add as much overhead as it sounds, because
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* when the statistical clock is active, the hardclock driver no longer
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* needs to keep (inaccurate) statistics on its own. This decouples
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* statistics gathering from scheduling interrupts.
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*
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* The RTC chip requires that we read status register C (RTC_INTR)
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* to acknowledge an interrupt, before it will generate the next one.
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* Under high interrupt load, rtcintr() can be indefinitely delayed and
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* the clock can tick immediately after the read from RTC_INTR. In this
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* case, the mc146818A interrupt signal will not drop for long enough
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* to register with the 8259 PIC. If an interrupt is missed, the stat
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* clock will halt, considerably degrading system performance. This is
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* why we use 'while' rather than a more straightforward 'if' below.
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* Stat clock ticks can still be lost, causing minor loss of accuracy
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* in the statistics, but the stat clock will no longer stop.
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*/
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static int
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rtc_intr(void *arg)
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{
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struct atrtc_softc *sc = (struct atrtc_softc *)arg;
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int flag = 0;
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while (rtcin(RTC_INTR) & RTCIR_PERIOD) {
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flag = 1;
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if (sc->et.et_active) {
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sc->et.et_event_cb(&sc->et,
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sc->et.et_arg ? sc->et.et_arg :
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curthread->td_intr_frame);
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}
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}
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return(flag ? FILTER_HANDLED : FILTER_STRAY);
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}
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/*
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* Attach to the ISA PnP descriptors for the timer and realtime clock.
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*/
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static struct isa_pnp_id atrtc_ids[] = {
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{ 0x000bd041 /* PNP0B00 */, "AT realtime clock" },
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{ 0 }
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};
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static int
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atrtc_probe(device_t dev)
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{
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int result;
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device_set_desc(dev, "AT Real Time Clock");
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result = ISA_PNP_PROBE(device_get_parent(dev), dev, atrtc_ids);
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/* ENXIO if wrong PnP-ID, ENOENT ifno PnP-ID, zero if good PnP-iD */
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if (result != ENOENT)
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return(result);
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/* All PC's have an RTC, and we're hosed without it, so... */
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return (BUS_PROBE_LOW_PRIORITY);
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}
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static int
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atrtc_attach(device_t dev)
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{
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struct atrtc_softc *sc;
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int i, diag;
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sc = device_get_softc(dev);
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if (!(sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT,
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&sc->port_rid, IO_RTC, IO_RTC + 1, 2, RF_ACTIVE)))
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device_printf(dev,"Warning: Couldn't map I/O.\n");
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diag = rtcin(RTC_DIAG);
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if (diag != 0)
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printf("RTC BIOS diagnostic error %b\n", diag, RTCDG_BITS);
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atrtc_start();
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clock_register(dev, 1000000);
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bzero(&sc->et, sizeof(struct eventtimer));
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if (!atrtcclock_disable &&
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(resource_int_value(device_get_name(dev), device_get_unit(dev),
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"clock", &i) != 0 || i != 0)) {
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if (!(sc->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ,
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&sc->intr_rid, 8, 8, 1, RF_ACTIVE))) {
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device_printf(dev,"Can't map interrupt.\n");
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return (0);
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} else if ((bus_setup_intr(dev, sc->intr_res,
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INTR_MPSAFE | INTR_TYPE_CLK,
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(driver_filter_t *)rtc_intr, NULL,
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sc, &sc->intr_handler))) {
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device_printf(dev, "Can't setup interrupt.\n");
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return (0);
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} else {
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/* Bind IRQ to BSP to avoid live migration. */
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bus_bind_intr(dev, sc->intr_res, 0);
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}
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sc->et.et_name = "RTC";
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sc->et.et_flags = ET_FLAGS_PERIODIC;
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sc->et.et_quality = 0;
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sc->et.et_frequency = 32768;
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sc->et.et_start = rtc_start;
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sc->et.et_stop = rtc_stop;
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sc->et.et_priv = dev;
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et_register(&sc->et);
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}
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return(0);
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}
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static int
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atrtc_resume(device_t dev)
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{
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atrtc_restore();
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return(0);
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}
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static int
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atrtc_settime(device_t dev __unused, struct timespec *ts)
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{
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struct clocktime ct;
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clock_ts_to_ct(ts, &ct);
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/* Disable RTC updates and interrupts. */
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writertc(RTC_STATUSB, RTCSB_HALT | RTCSB_24HR);
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writertc(RTC_SEC, bin2bcd(ct.sec)); /* Write back Seconds */
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writertc(RTC_MIN, bin2bcd(ct.min)); /* Write back Minutes */
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writertc(RTC_HRS, bin2bcd(ct.hour)); /* Write back Hours */
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writertc(RTC_WDAY, ct.dow + 1); /* Write back Weekday */
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writertc(RTC_DAY, bin2bcd(ct.day)); /* Write back Day */
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writertc(RTC_MONTH, bin2bcd(ct.mon)); /* Write back Month */
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writertc(RTC_YEAR, bin2bcd(ct.year % 100)); /* Write back Year */
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#ifdef USE_RTC_CENTURY
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writertc(RTC_CENTURY, bin2bcd(ct.year / 100)); /* ... and Century */
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#endif
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/* Reenable RTC updates and interrupts. */
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writertc(RTC_STATUSB, rtc_statusb);
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rtcin(RTC_INTR);
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return (0);
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}
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static int
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atrtc_gettime(device_t dev, struct timespec *ts)
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{
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struct clocktime ct;
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int s;
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/* Look if we have a RTC present and the time is valid */
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if (!(rtcin(RTC_STATUSD) & RTCSD_PWR)) {
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device_printf(dev, "WARNING: Battery failure indication\n");
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return (EINVAL);
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}
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/* wait for time update to complete */
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/* If RTCSA_TUP is zero, we have at least 244us before next update */
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s = splhigh();
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while (rtcin(RTC_STATUSA) & RTCSA_TUP) {
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splx(s);
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s = splhigh();
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}
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ct.nsec = 0;
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ct.sec = readrtc(RTC_SEC);
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ct.min = readrtc(RTC_MIN);
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ct.hour = readrtc(RTC_HRS);
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ct.day = readrtc(RTC_DAY);
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ct.dow = readrtc(RTC_WDAY) - 1;
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ct.mon = readrtc(RTC_MONTH);
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ct.year = readrtc(RTC_YEAR);
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#ifdef USE_RTC_CENTURY
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ct.year += readrtc(RTC_CENTURY) * 100;
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#else
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ct.year += 2000;
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#endif
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/* Set dow = -1 because some clocks don't set it correctly. */
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ct.dow = -1;
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return (clock_ct_to_ts(&ct, ts));
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}
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static device_method_t atrtc_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, atrtc_probe),
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DEVMETHOD(device_attach, atrtc_attach),
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DEVMETHOD(device_detach, bus_generic_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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/* XXX stop statclock? */
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DEVMETHOD(device_resume, atrtc_resume),
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/* clock interface */
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DEVMETHOD(clock_gettime, atrtc_gettime),
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DEVMETHOD(clock_settime, atrtc_settime),
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{ 0, 0 }
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};
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static driver_t atrtc_driver = {
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"atrtc",
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atrtc_methods,
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sizeof(struct atrtc_softc),
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};
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static devclass_t atrtc_devclass;
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DRIVER_MODULE(atrtc, isa, atrtc_driver, atrtc_devclass, 0, 0);
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DRIVER_MODULE(atrtc, acpi, atrtc_driver, atrtc_devclass, 0, 0);
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#include "opt_ddb.h"
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#ifdef DDB
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#include <ddb/ddb.h>
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DB_SHOW_COMMAND(rtc, rtc)
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{
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printf("%02x/%02x/%02x %02x:%02x:%02x, A = %02x, B = %02x, C = %02x\n",
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rtcin(RTC_YEAR), rtcin(RTC_MONTH), rtcin(RTC_DAY),
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rtcin(RTC_HRS), rtcin(RTC_MIN), rtcin(RTC_SEC),
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rtcin(RTC_STATUSA), rtcin(RTC_STATUSB), rtcin(RTC_INTR));
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}
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#endif /* DDB */
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