7e82012aff
In addition to the device driver functionality, it exposes a number of functions which various other bits of code use to fondle the RTC chip.
300 lines
7.2 KiB
C
300 lines
7.2 KiB
C
/*-
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* Copyright (c) 2008 Poul-Henning Kamp
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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 <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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#define RTC_LOCK mtx_lock_spin(&clock_lock)
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#define RTC_UNLOCK mtx_unlock_spin(&clock_lock)
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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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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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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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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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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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#include "clock_if.h"
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#include <sys/rman.h>
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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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};
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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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/*
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* Not that we need them or anything, but grab our resources
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* so they show up, correctly attributed, in the big picture.
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*/
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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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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,"Warning: Couldn't map Interrupt.\n");
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clock_register(dev, 1000000);
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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, bus_generic_resume),
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/* XXX restart statclock? */
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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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