6d8617d42a
print a one line error message. Add some comments on not being able to trust the day of week field (I'll act on these comments in a follow up commit). Approved by: re MFC after: 3 weeks
248 lines
6.1 KiB
C
248 lines
6.1 KiB
C
/*-
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* Copyright (c) 2004 Marius Strobl <marius@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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* The `rtc' device is a MC146818 compatible clock found on the ISA
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* bus and EBus. The EBus variant actually is the Real-Time Clock
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* function of a National Semiconductor PC87317/PC97317 which also
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* provides Advanced Power Control functionality.
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*/
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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/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/resource.h>
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#include <dev/ofw/ofw_bus.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/rman.h>
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#include <isa/isavar.h>
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#include <dev/mc146818/mc146818reg.h>
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#include <dev/mc146818/mc146818var.h>
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#include "clock_if.h"
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#define RTC_DESC "Real-Time Clock"
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#define RTC_READ mc146818_def_read
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#define RTC_WRITE mc146818_def_write
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#define PC87317_COMMON MC_REGA_DV0 /* bank 0 */
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#define PC87317_RTC (MC_REGA_DV1 | MC_REGA_DV0) /* bank 1 */
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#define PC87317_RTC_CR 0x48 /* Century Register */
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#define PC87317_APC MC_REGA_DV2 /* bank 2 */
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#define PC87317_APC_CADDR 0x51 /* Century Address Register */
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#define PC87317_APC_CADDR_BANK0 0x00 /* locate CR in bank 0 */
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#define PC87317_APC_CADDR_BANK1 0x80 /* locate CR in bank 1 */
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static devclass_t rtc_devclass;
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static device_attach_t rtc_attach;
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static device_probe_t rtc_ebus_probe;
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#ifdef DEV_ISA
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static device_probe_t rtc_isa_probe;
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#endif
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static device_method_t rtc_ebus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, rtc_ebus_probe),
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DEVMETHOD(device_attach, rtc_attach),
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/* clock interface */
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DEVMETHOD(clock_gettime, mc146818_gettime),
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DEVMETHOD(clock_settime, mc146818_settime),
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{ 0, 0 }
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};
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static driver_t rtc_ebus_driver = {
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"rtc",
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rtc_ebus_methods,
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sizeof(struct mc146818_softc),
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};
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DRIVER_MODULE(rtc, ebus, rtc_ebus_driver, rtc_devclass, 0, 0);
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#ifdef DEV_ISA
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static device_method_t rtc_isa_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, rtc_isa_probe),
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DEVMETHOD(device_attach, rtc_attach),
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/* clock interface */
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DEVMETHOD(clock_gettime, mc146818_gettime),
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DEVMETHOD(clock_settime, mc146818_settime),
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{ 0, 0 }
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};
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static driver_t rtc_isa_driver = {
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"rtc",
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rtc_isa_methods,
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sizeof(struct mc146818_softc),
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};
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DRIVER_MODULE(rtc, isa, rtc_isa_driver, rtc_devclass, 0, 0);
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#endif
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static u_int pc87317_getcent(device_t);
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static void pc87317_setcent(device_t, u_int);
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static int
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rtc_ebus_probe(device_t dev)
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{
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if (strcmp(ofw_bus_get_name(dev), "rtc") == 0) {
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device_set_desc(dev, RTC_DESC);
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return (0);
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}
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return (ENXIO);
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}
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#ifdef DEV_ISA
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static struct isa_pnp_id rtc_isa_ids[] = {
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{ 0x000bd041, RTC_DESC }, /* PNP0B00 */
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{ 0 }
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};
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static int
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rtc_isa_probe(device_t dev)
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{
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if (ISA_PNP_PROBE(device_get_parent(dev), dev, rtc_isa_ids) == 0)
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return (0);
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return (ENXIO);
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}
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#endif
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static int
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rtc_attach(device_t dev)
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{
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struct timespec ts;
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struct mc146818_softc *sc;
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struct resource *res;
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int ebus, error, rid;
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sc = device_get_softc(dev);
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mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN);
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ebus = 0;
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if (strcmp(device_get_name(device_get_parent(dev)), "ebus") == 0)
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ebus = 1;
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rid = 0;
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res = bus_alloc_resource_any(dev, ebus ? SYS_RES_MEMORY :
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SYS_RES_IOPORT, &rid, RF_ACTIVE);
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if (res == NULL) {
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device_printf(dev, "cannot allocate resources\n");
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error = ENXIO;
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goto fail_mtx;
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}
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sc->sc_bst = rman_get_bustag(res);
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sc->sc_bsh = rman_get_bushandle(res);
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sc->sc_mcread = RTC_READ;
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sc->sc_mcwrite = RTC_WRITE;
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/* The TOD clock year 0 is 0. */
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sc->sc_year0 = 0;
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/*
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* For ISA use the default century get/set functions, for EBus we
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* provide our own versions.
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*/
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sc->sc_flag = MC146818_NO_CENT_ADJUST;
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if (ebus) {
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/*
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* Make sure the CR is at the default location (also used
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* by Solaris).
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*/
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RTC_WRITE(dev, MC_REGA, PC87317_APC);
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RTC_WRITE(dev, PC87317_APC_CADDR, PC87317_APC_CADDR_BANK1 |
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PC87317_RTC_CR);
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RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
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sc->sc_getcent = pc87317_getcent;
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sc->sc_setcent = pc87317_setcent;
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}
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if ((error = mc146818_attach(dev)) != 0) {
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device_printf(dev, "cannot attach time of day clock\n");
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goto fail_res;
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}
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if (bootverbose) {
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if (mc146818_gettime(dev, &ts) != 0)
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device_printf(dev, "invalid time");
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else
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device_printf(dev, "current time: %ld.%09ld\n",
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(long)ts.tv_sec, ts.tv_nsec);
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}
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return (0);
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fail_res:
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bus_release_resource(dev, ebus ? SYS_RES_MEMORY : SYS_RES_IOPORT, rid,
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res);
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fail_mtx:
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mtx_destroy(&sc->sc_mtx);
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return (error);
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}
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static u_int
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pc87317_getcent(device_t dev)
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{
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u_int cent;
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RTC_WRITE(dev, MC_REGA, PC87317_RTC);
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cent = RTC_READ(dev, PC87317_RTC_CR);
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RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
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return (cent);
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}
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static void
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pc87317_setcent(device_t dev, u_int cent)
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{
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RTC_WRITE(dev, MC_REGA, PC87317_RTC);
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RTC_WRITE(dev, PC87317_RTC_CR, cent);
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RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
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}
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