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/*-
* Copyright (c) 2004 Marius Strobl <marius@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* The `rtc' device is found on the ISA bus and the EBus. The ISA version
* always is a MC146818 compatible clock while the EBus variant either is the
* MC146818 compatible Real-Time Clock function of a National Semiconductor
* PC87317/PC97317 which also provides Advanced Power Control functionality
* or a Texas Instruments bq4802.
*/
#include "opt_isa.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/resource.h>
#include <dev/ofw/ofw_bus.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <isa/isavar.h>
#include <dev/mc146818/mc146818reg.h>
#include <dev/mc146818/mc146818var.h>
#include "clock_if.h"
#define RTC_DESC "Real-Time Clock"
#define RTC_READ mc146818_def_read
#define RTC_WRITE mc146818_def_write
#define PC87317_COMMON MC_REGA_DV0 /* bank 0 */
#define PC87317_RTC (MC_REGA_DV1 | MC_REGA_DV0) /* bank 1 */
#define PC87317_RTC_CR 0x48 /* Century Register */
#define PC87317_APC MC_REGA_DV2 /* bank 2 */
#define PC87317_APC_CADDR 0x51 /* Century Address Register */
#define PC87317_APC_CADDR_BANK0 0x00 /* locate CR in bank 0 */
#define PC87317_APC_CADDR_BANK1 0x80 /* locate CR in bank 1 */
static devclass_t rtc_devclass;
static device_attach_t rtc_attach;
static device_probe_t rtc_ebus_probe;
#ifdef DEV_ISA
static device_probe_t rtc_isa_probe;
#endif
static device_method_t rtc_ebus_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, rtc_ebus_probe),
DEVMETHOD(device_attach, rtc_attach),
/* clock interface */
DEVMETHOD(clock_gettime, mc146818_gettime),
DEVMETHOD(clock_settime, mc146818_settime),
DEVMETHOD_END
};
static driver_t rtc_ebus_driver = {
"rtc",
rtc_ebus_methods,
sizeof(struct mc146818_softc),
};
DRIVER_MODULE(rtc, ebus, rtc_ebus_driver, rtc_devclass, 0, 0);
#ifdef DEV_ISA
static device_method_t rtc_isa_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, rtc_isa_probe),
DEVMETHOD(device_attach, rtc_attach),
/* clock interface */
DEVMETHOD(clock_gettime, mc146818_gettime),
DEVMETHOD(clock_settime, mc146818_settime),
DEVMETHOD_END
};
static driver_t rtc_isa_driver = {
"rtc",
rtc_isa_methods,
sizeof(struct mc146818_softc),
};
DRIVER_MODULE(rtc, isa, rtc_isa_driver, rtc_devclass, 0, 0);
#endif
static u_int pc87317_getcent(device_t dev);
static void pc87317_setcent(device_t dev, u_int cent);
static int
rtc_ebus_probe(device_t dev)
{
if (strcmp(ofw_bus_get_name(dev), "rtc") == 0) {
/* The bq4802 is not supported, yet. */
if (ofw_bus_get_compat(dev) != NULL &&
strcmp(ofw_bus_get_compat(dev), "bq4802") == 0)
return (ENXIO);
device_set_desc(dev, RTC_DESC);
return (0);
}
return (ENXIO);
}
#ifdef DEV_ISA
static struct isa_pnp_id rtc_isa_ids[] = {
{ 0x000bd041, RTC_DESC }, /* PNP0B00 */
{ 0 }
};
static int
rtc_isa_probe(device_t dev)
{
if (ISA_PNP_PROBE(device_get_parent(dev), dev, rtc_isa_ids) == 0)
return (0);
return (ENXIO);
}
#endif
static int
rtc_attach(device_t dev)
{
struct timespec ts;
struct mc146818_softc *sc;
struct resource *res;
int ebus, error, rid;
sc = device_get_softc(dev);
mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN);
ebus = 0;
if (strcmp(device_get_name(device_get_parent(dev)), "ebus") == 0)
ebus = 1;
rid = 0;
res = bus_alloc_resource_any(dev, ebus ? SYS_RES_MEMORY :
SYS_RES_IOPORT, &rid, RF_ACTIVE);
if (res == NULL) {
device_printf(dev, "cannot allocate resources\n");
error = ENXIO;
goto fail_mtx;
}
sc->sc_bst = rman_get_bustag(res);
sc->sc_bsh = rman_get_bushandle(res);
sc->sc_mcread = RTC_READ;
sc->sc_mcwrite = RTC_WRITE;
/* The TOD clock year 0 is 0. */
sc->sc_year0 = 0;
/*
* For ISA use the default century get/set functions, for EBus we
* provide our own versions.
*/
sc->sc_flag = MC146818_NO_CENT_ADJUST;
if (ebus) {
/*
* Make sure the CR is at the default location (also used
* by Solaris).
*/
RTC_WRITE(dev, MC_REGA, PC87317_APC);
RTC_WRITE(dev, PC87317_APC_CADDR, PC87317_APC_CADDR_BANK1 |
PC87317_RTC_CR);
RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
sc->sc_getcent = pc87317_getcent;
sc->sc_setcent = pc87317_setcent;
}
if ((error = mc146818_attach(dev)) != 0) {
device_printf(dev, "cannot attach time of day clock\n");
goto fail_res;
}
if (bootverbose) {
if (mc146818_gettime(dev, &ts) != 0)
device_printf(dev, "invalid time");
else
device_printf(dev, "current time: %ld.%09ld\n",
(long)ts.tv_sec, ts.tv_nsec);
}
return (0);
fail_res:
bus_release_resource(dev, ebus ? SYS_RES_MEMORY : SYS_RES_IOPORT, rid,
res);
fail_mtx:
mtx_destroy(&sc->sc_mtx);
return (error);
}
static u_int
pc87317_getcent(device_t dev)
{
u_int cent;
RTC_WRITE(dev, MC_REGA, PC87317_RTC);
cent = RTC_READ(dev, PC87317_RTC_CR);
RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
return (cent);
}
static void
pc87317_setcent(device_t dev, u_int cent)
{
RTC_WRITE(dev, MC_REGA, PC87317_RTC);
RTC_WRITE(dev, PC87317_RTC_CR, cent);
RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
}
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