9f026a420b
booting on a PC with CMOS clock set to a year before 2000. This uses 1980 (instead of 1970 as in the initial patch) as pivot year as suggested by imp in the PR followup. PR: 195703 Submitted by: cs@soi.spb.ru Reviewed by: imp MFC after: 1 weeks
405 lines
10 KiB
C
405 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/kdb.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 do { if (!kdb_active) mtx_lock_spin(&clock_lock); } while (0)
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#define RTC_UNLOCK do { if (!kdb_active) mtx_unlock_spin(&clock_lock); } while (0)
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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, sbintime_t first, sbintime_t period)
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{
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atrtc_rate(max(fls(period + (period >> 1)) - 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, sc->et.et_arg);
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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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result = ISA_PNP_PROBE(device_get_parent(dev), dev, atrtc_ids);
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/* ENOENT means no PnP-ID, device is hinted. */
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if (result == ENOENT) {
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device_set_desc(dev, "AT realtime clock");
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return (BUS_PROBE_LOW_PRIORITY);
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}
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return (result);
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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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u_long s;
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int i;
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sc = device_get_softc(dev);
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sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->port_rid,
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IO_RTC, IO_RTC + 1, 2, RF_ACTIVE);
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if (sc->port_res == NULL)
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device_printf(dev, "Warning: Couldn't map I/O.\n");
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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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sc->intr_rid = 0;
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while (bus_get_resource(dev, SYS_RES_IRQ, sc->intr_rid,
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&s, NULL) == 0 && s != 8)
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sc->intr_rid++;
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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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if (sc->intr_res == NULL) {
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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, INTR_TYPE_CLK,
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rtc_intr, NULL, 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 | ET_FLAGS_POW2DIV;
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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_min_period = 0x00080000;
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sc->et.et_max_period = 0x80000000;
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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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/* 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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/*
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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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* This is fast enough on most hardware, but a refinement would be
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* to make sure that no more than 240us pass after we start reading,
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* and try again if so.
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*/
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while (rtcin(RTC_STATUSA) & RTCSA_TUP)
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continue;
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critical_enter();
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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 += (ct.year < 80 ? 2000 : 1900);
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#endif
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critical_exit();
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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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