2b4ee39838
FreeBSD base system does not provide an ACPI handler for the PC/AT RTC/CMOS device with PnP ID PNP0B00; on some HP laptops, the absence of this handler causes suspend/resume and poweroff(8) to hang or fail [1], [2]. On these laptops EC _REG method queries the RTC date/time registers via ACPI before suspending/powering off. The handler should be registered before acpi_ec driver is loaded. This change adds handler to access CMOS RTC operation region described in section 9.15 of ACPI-6.2 specification [3]. It is installed only for ACPI version of atrtc(4) so it should not affect old ACPI-less i386 systems. It is possible to disable the handler with loader tunable: debug.acpi.disabled=atrtc Informational debugging printf can be enabled by setting hw.acpi.verbose=1 in loader.conf [1] https://wiki.freebsd.org/Laptops/HP_Envy_6Z-1100 [2] https://wiki.freebsd.org/Laptops/HP_Notebook_15-af104ur [3] https://uefi.org/sites/default/files/resources/ACPI_6_2.pdf PR: 207419, 213039 Submitted by: Anthony Jenkins <Scoobi_doo@yahoo.com> Reviewed by: ian Discussed on: acpi@, 2013-2015, several threads MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D19314
655 lines
16 KiB
C
655 lines
16 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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_acpi.h"
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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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#ifdef DEV_ACPI
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/accommon.h>
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#include <dev/acpica/acpivar.h>
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#include <machine/md_var.h>
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#endif
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/*
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* atrtc_lock protects low-level access to individual hardware registers.
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* atrtc_time_lock protects the entire sequence of accessing multiple registers
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* to read or write the date and time.
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*/
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static struct mtx atrtc_lock;
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MTX_SYSINIT(atrtc_lock_init, &atrtc_lock, "atrtc", MTX_SPIN);
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/* Force RTC enabled/disabled. */
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static int atrtc_enabled = -1;
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TUNABLE_INT("hw.atrtc.enabled", &atrtc_enabled);
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struct mtx atrtc_time_lock;
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MTX_SYSINIT(atrtc_time_lock_init, &atrtc_time_lock, "atrtc_time", MTX_DEF);
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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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static inline u_char
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rtcin_locked(int reg)
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{
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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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return (inb(IO_RTC + 1));
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}
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static inline void
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rtcout_locked(int reg, u_char val)
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{
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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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}
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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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mtx_lock_spin(&atrtc_lock);
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val = rtcin_locked(reg);
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mtx_unlock_spin(&atrtc_lock);
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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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mtx_lock_spin(&atrtc_lock);
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rtcout_locked(reg, val);
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mtx_unlock_spin(&atrtc_lock);
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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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mtx_lock_spin(&atrtc_lock);
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rtcout_locked(RTC_STATUSA, rtc_statusa);
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rtcout_locked(RTC_STATUSB, RTCSB_24HR);
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mtx_unlock_spin(&atrtc_lock);
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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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mtx_lock_spin(&atrtc_lock);
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rtcout_locked(RTC_STATUSB, rtc_statusb);
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rtcin_locked(RTC_INTR);
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mtx_unlock_spin(&atrtc_lock);
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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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mtx_lock_spin(&atrtc_lock);
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rtcout_locked(RTC_STATUSB, rtc_statusb);
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rtcin_locked(RTC_INTR);
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mtx_unlock_spin(&atrtc_lock);
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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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mtx_lock_spin(&atrtc_lock);
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rtcin_locked(RTC_STATUSA); /* dummy to get rtc_reg set */
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rtcout_locked(RTC_STATUSB, RTCSB_24HR);
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rtcout_locked(RTC_STATUSA, rtc_statusa);
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rtcout_locked(RTC_STATUSB, rtc_statusb);
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rtcin_locked(RTC_INTR);
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mtx_unlock_spin(&atrtc_lock);
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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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#ifdef DEV_ACPI
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ACPI_HANDLE acpi_handle;
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#endif
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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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#ifdef DEV_ACPI
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/*
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* ACPI RTC CMOS address space handler
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*/
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#define ATRTC_LAST_REG 0x40
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static void
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rtcin_region(int reg, void *buf, int len)
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{
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u_char *ptr = buf;
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/* Drop lock after each IO as intr and settime have greater priority */
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while (len-- > 0)
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*ptr++ = rtcin(reg++) & 0xff;
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}
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static void
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rtcout_region(int reg, const void *buf, int len)
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{
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const u_char *ptr = buf;
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while (len-- > 0)
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writertc(reg++, *ptr++);
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}
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static bool
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atrtc_check_cmos_access(bool is_read, ACPI_PHYSICAL_ADDRESS addr, UINT32 len)
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{
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/* Block address space wrapping on out-of-bound access */
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if (addr >= ATRTC_LAST_REG || addr + len > ATRTC_LAST_REG)
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return (false);
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if (is_read) {
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/* Reading 0x0C will muck with interrupts */
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if (addr <= RTC_INTR && addr + len > RTC_INTR)
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return (false);
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} else {
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/*
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* Allow single-byte writes to alarm registers and
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* multi-byte writes to addr >= 0x30, else deny.
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*/
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if (!((len == 1 && (addr == RTC_SECALRM ||
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addr == RTC_MINALRM ||
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addr == RTC_HRSALRM)) ||
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addr >= 0x30))
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return (false);
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}
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return (true);
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}
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static ACPI_STATUS
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atrtc_acpi_cmos_handler(UINT32 func, ACPI_PHYSICAL_ADDRESS addr,
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UINT32 bitwidth, UINT64 *value, void *context, void *region_context)
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{
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device_t dev = context;
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UINT32 bytewidth = howmany(bitwidth, 8);
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bool is_read = func == ACPI_READ;
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/* ACPICA is very verbose on CMOS handler failures, so we, too */
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#define CMOS_HANDLER_ERR(fmt, ...) \
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device_printf(dev, "ACPI [SystemCMOS] handler: " fmt, ##__VA_ARGS__)
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ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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if (value == NULL) {
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CMOS_HANDLER_ERR("NULL parameter\n");
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return (AE_BAD_PARAMETER);
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}
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if (bitwidth == 0 || (bitwidth & 0x07) != 0) {
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CMOS_HANDLER_ERR("Invalid bitwidth: %u\n", bitwidth);
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return (AE_BAD_PARAMETER);
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}
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if (!atrtc_check_cmos_access(is_read, addr, bytewidth)) {
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CMOS_HANDLER_ERR("%s access rejected: addr=%#04jx, len=%u\n",
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is_read ? "Read" : "Write", (uintmax_t)addr, bytewidth);
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return (AE_BAD_PARAMETER);
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}
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switch (func) {
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case ACPI_READ:
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rtcin_region(addr, value, bytewidth);
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break;
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case ACPI_WRITE:
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rtcout_region(addr, value, bytewidth);
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break;
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default:
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CMOS_HANDLER_ERR("Invalid function: %u\n", func);
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return (AE_BAD_PARAMETER);
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}
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ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
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"ACPI RTC CMOS %s access: addr=%#04x, len=%u, val=%*D\n",
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is_read ? "read" : "write", (unsigned)addr, bytewidth,
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bytewidth, value, " ");
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return (AE_OK);
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}
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static int
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atrtc_reg_acpi_cmos_handler(device_t dev)
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{
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struct atrtc_softc *sc = device_get_softc(dev);
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ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
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/* Don't handle address space events if driver is disabled. */
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if (acpi_disabled("atrtc"))
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return (ENXIO);
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sc->acpi_handle = acpi_get_handle(dev);
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if (sc->acpi_handle == NULL ||
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ACPI_FAILURE(AcpiInstallAddressSpaceHandler(sc->acpi_handle,
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ACPI_ADR_SPACE_CMOS, atrtc_acpi_cmos_handler, NULL, dev))) {
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sc->acpi_handle = NULL;
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device_printf(dev,
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"Can't register ACPI CMOS address space handler\n");
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return (ENXIO);
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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_unreg_acpi_cmos_handler(device_t dev)
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{
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struct atrtc_softc *sc = device_get_softc(dev);
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ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
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if (sc->acpi_handle != NULL)
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AcpiRemoveAddressSpaceHandler(sc->acpi_handle,
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ACPI_ADR_SPACE_CMOS, atrtc_acpi_cmos_handler);
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return (0);
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}
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#endif /* DEV_ACPI */
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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 bool
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atrtc_acpi_disabled(void)
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{
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#ifdef DEV_ACPI
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uint16_t flags;
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if (!acpi_get_fadt_bootflags(&flags))
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return (false);
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return ((flags & ACPI_FADT_NO_CMOS_RTC) != 0);
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#else
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return (false);
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#endif
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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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if ((atrtc_enabled == -1 && atrtc_acpi_disabled()) ||
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(atrtc_enabled == 0))
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return (ENXIO);
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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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rman_res_t 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_isa_attach(device_t dev)
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{
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return (atrtc_attach(dev));
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}
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#ifdef DEV_ACPI
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static int
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atrtc_acpi_attach(device_t dev)
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{
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int ret;
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ret = atrtc_attach(dev);
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|
if (ret)
|
|
return (ret);
|
|
|
|
(void)atrtc_reg_acpi_cmos_handler(dev);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
atrtc_acpi_detach(device_t dev)
|
|
{
|
|
|
|
(void)atrtc_unreg_acpi_cmos_handler(dev);
|
|
return (0);
|
|
}
|
|
#endif /* DEV_ACPI */
|
|
|
|
static int
|
|
atrtc_resume(device_t dev)
|
|
{
|
|
|
|
atrtc_restore();
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
atrtc_settime(device_t dev __unused, struct timespec *ts)
|
|
{
|
|
struct bcd_clocktime bct;
|
|
|
|
clock_ts_to_bcd(ts, &bct, false);
|
|
clock_dbgprint_bcd(dev, CLOCK_DBG_WRITE, &bct);
|
|
|
|
mtx_lock(&atrtc_time_lock);
|
|
mtx_lock_spin(&atrtc_lock);
|
|
|
|
/* Disable RTC updates and interrupts. */
|
|
rtcout_locked(RTC_STATUSB, RTCSB_HALT | RTCSB_24HR);
|
|
|
|
/* Write all the time registers. */
|
|
rtcout_locked(RTC_SEC, bct.sec);
|
|
rtcout_locked(RTC_MIN, bct.min);
|
|
rtcout_locked(RTC_HRS, bct.hour);
|
|
rtcout_locked(RTC_WDAY, bct.dow + 1);
|
|
rtcout_locked(RTC_DAY, bct.day);
|
|
rtcout_locked(RTC_MONTH, bct.mon);
|
|
rtcout_locked(RTC_YEAR, bct.year & 0xff);
|
|
#ifdef USE_RTC_CENTURY
|
|
rtcout_locked(RTC_CENTURY, bct.year >> 8);
|
|
#endif
|
|
|
|
/*
|
|
* Re-enable RTC updates and interrupts.
|
|
*/
|
|
rtcout_locked(RTC_STATUSB, rtc_statusb);
|
|
rtcin_locked(RTC_INTR);
|
|
|
|
mtx_unlock_spin(&atrtc_lock);
|
|
mtx_unlock(&atrtc_time_lock);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
atrtc_gettime(device_t dev, struct timespec *ts)
|
|
{
|
|
struct bcd_clocktime bct;
|
|
|
|
/* Look if we have a RTC present and the time is valid */
|
|
if (!(rtcin(RTC_STATUSD) & RTCSD_PWR)) {
|
|
device_printf(dev, "WARNING: Battery failure indication\n");
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* wait for time update to complete
|
|
* If RTCSA_TUP is zero, we have at least 244us before next update.
|
|
* This is fast enough on most hardware, but a refinement would be
|
|
* to make sure that no more than 240us pass after we start reading,
|
|
* and try again if so.
|
|
*/
|
|
mtx_lock(&atrtc_time_lock);
|
|
while (rtcin(RTC_STATUSA) & RTCSA_TUP)
|
|
continue;
|
|
mtx_lock_spin(&atrtc_lock);
|
|
bct.sec = rtcin_locked(RTC_SEC);
|
|
bct.min = rtcin_locked(RTC_MIN);
|
|
bct.hour = rtcin_locked(RTC_HRS);
|
|
bct.day = rtcin_locked(RTC_DAY);
|
|
bct.mon = rtcin_locked(RTC_MONTH);
|
|
bct.year = rtcin_locked(RTC_YEAR);
|
|
#ifdef USE_RTC_CENTURY
|
|
bct.year |= rtcin_locked(RTC_CENTURY) << 8;
|
|
#endif
|
|
mtx_unlock_spin(&atrtc_lock);
|
|
mtx_unlock(&atrtc_time_lock);
|
|
/* dow is unused in timespec conversion and we have no nsec info. */
|
|
bct.dow = 0;
|
|
bct.nsec = 0;
|
|
clock_dbgprint_bcd(dev, CLOCK_DBG_READ, &bct);
|
|
return (clock_bcd_to_ts(&bct, ts, false));
|
|
}
|
|
|
|
static device_method_t atrtc_isa_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, atrtc_probe),
|
|
DEVMETHOD(device_attach, atrtc_isa_attach),
|
|
DEVMETHOD(device_detach, bus_generic_detach),
|
|
DEVMETHOD(device_shutdown, bus_generic_shutdown),
|
|
DEVMETHOD(device_suspend, bus_generic_suspend),
|
|
/* XXX stop statclock? */
|
|
DEVMETHOD(device_resume, atrtc_resume),
|
|
|
|
/* clock interface */
|
|
DEVMETHOD(clock_gettime, atrtc_gettime),
|
|
DEVMETHOD(clock_settime, atrtc_settime),
|
|
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t atrtc_isa_driver = {
|
|
"atrtc",
|
|
atrtc_isa_methods,
|
|
sizeof(struct atrtc_softc),
|
|
};
|
|
|
|
#ifdef DEV_ACPI
|
|
static device_method_t atrtc_acpi_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, atrtc_probe),
|
|
DEVMETHOD(device_attach, atrtc_acpi_attach),
|
|
DEVMETHOD(device_detach, atrtc_acpi_detach),
|
|
/* XXX stop statclock? */
|
|
DEVMETHOD(device_resume, atrtc_resume),
|
|
|
|
/* clock interface */
|
|
DEVMETHOD(clock_gettime, atrtc_gettime),
|
|
DEVMETHOD(clock_settime, atrtc_settime),
|
|
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t atrtc_acpi_driver = {
|
|
"atrtc",
|
|
atrtc_acpi_methods,
|
|
sizeof(struct atrtc_softc),
|
|
};
|
|
#endif /* DEV_ACPI */
|
|
|
|
static devclass_t atrtc_devclass;
|
|
|
|
DRIVER_MODULE(atrtc, isa, atrtc_isa_driver, atrtc_devclass, 0, 0);
|
|
#ifdef DEV_ACPI
|
|
DRIVER_MODULE(atrtc, acpi, atrtc_acpi_driver, atrtc_devclass, 0, 0);
|
|
#endif
|
|
ISA_PNP_INFO(atrtc_ids);
|