1703f2b424
and hide it inside of atrtc driver. Add new tunable hint.atrtc.0.clock controlling it. Setting it to 0 disables using RTC clock as stat-/ profclock sources. Teach i386 and amd64 SMP platforms to emulate stat-/profclocks using i8254 hardclock, when LAPIC and RTC clocks are disabled. This allows to reduce global interrupt rate of idle system down to about 100 interrupts per core, permitting C3 and deeper C-states provide maximum CPU power efficiency.
332 lines
7.6 KiB
C
332 lines
7.6 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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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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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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int
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atrtc_setup_clock(void)
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{
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int diag;
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if (atrtcclock_disable)
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return (0);
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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",
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diag, RTCDG_BITS);
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return (0);
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}
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stathz = RTC_NOPROFRATE;
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profhz = RTC_PROFRATE;
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return (1);
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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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int i;
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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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if (resource_int_value("atrtc", 0, "clock", &i) == 0 && i == 0)
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atrtcclock_disable = 1;
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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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