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| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/ata/atacore/@/dev/mc146818/mc146818.c |
/*-
* Copyright (c) 2003 Izumi Tsutsui. 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 ``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 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.
*
* $NetBSD: mc146818.c,v 1.16 2008/05/14 13:29:28 tsutsui Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/mc146818/mc146818.c 201009 2009-12-25 22:58:43Z marius $");
/*
* mc146818 and compatible time of day chip subroutines
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/clock.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <machine/bus.h>
#include <dev/mc146818/mc146818reg.h>
#include <dev/mc146818/mc146818var.h>
#include "clock_if.h"
static u_int mc146818_def_getcent(device_t);
static void mc146818_def_setcent(device_t, u_int);
int
mc146818_attach(device_t dev)
{
struct mc146818_softc *sc;
sc = device_get_softc(dev);
if (mtx_initialized(&sc->sc_mtx) == 0) {
device_printf(dev, "%s: mutex not initialized\n", __func__);
return (ENXIO);
}
if (sc->sc_mcread == NULL)
sc->sc_mcread = mc146818_def_read;
if (sc->sc_mcwrite == NULL)
sc->sc_mcwrite = mc146818_def_write;
if (sc->sc_flag & MC146818_NO_CENT_ADJUST) {
/*
* Note that setting MC146818_NO_CENT_ADJUST means that
* the century has to be stored in NVRAM somewhere.
*/
if (sc->sc_getcent == NULL)
sc->sc_getcent = mc146818_def_getcent;
if (sc->sc_setcent == NULL)
sc->sc_setcent = mc146818_def_setcent;
}
mtx_lock_spin(&sc->sc_mtx);
if (!(*sc->sc_mcread)(dev, MC_REGD) & MC_REGD_VRT) {
mtx_unlock_spin(&sc->sc_mtx);
device_printf(dev, "%s: battery low\n", __func__);
return (ENXIO);
}
sc->sc_rega = MC_BASE_32_KHz;
(*sc->sc_mcwrite)(dev, MC_REGA, sc->sc_rega);
sc->sc_regb = 0;
sc->sc_regb |= (sc->sc_flag & MC146818_BCD) ? 0 : MC_REGB_BINARY;
sc->sc_regb |= (sc->sc_flag & MC146818_12HR) ? 0 : MC_REGB_24HR;
(*sc->sc_mcwrite)(dev, MC_REGB, sc->sc_regb);
mtx_unlock_spin(&sc->sc_mtx);
clock_register(dev, 1000000); /* 1 second resolution */
return (0);
}
/*
* Get time of day and convert it to a struct timespec.
* Return 0 on success, an error number otherwise.
*/
int
mc146818_gettime(device_t dev, struct timespec *ts)
{
struct mc146818_softc *sc;
struct clocktime ct;
int timeout, cent, year;
sc = device_get_softc(dev);
timeout = 1000000; /* XXX how long should we wait? */
/*
* If MC_REGA_UIP is 0 we have at least 244us before the next
* update. If it's 1 an update is imminent.
*/
for (;;) {
mtx_lock_spin(&sc->sc_mtx);
if (!((*sc->sc_mcread)(dev, MC_REGA) & MC_REGA_UIP))
break;
mtx_unlock_spin(&sc->sc_mtx);
if (--timeout < 0) {
device_printf(dev, "%s: timeout\n", __func__);
return (EBUSY);
}
}
#define FROMREG(x) ((sc->sc_flag & MC146818_BCD) ? FROMBCD(x) : (x))
ct.nsec = 0;
ct.sec = FROMREG((*sc->sc_mcread)(dev, MC_SEC));
ct.min = FROMREG((*sc->sc_mcread)(dev, MC_MIN));
ct.hour = FROMREG((*sc->sc_mcread)(dev, MC_HOUR));
/* Map dow from 1 - 7 to 0 - 6. */
ct.dow = FROMREG((*sc->sc_mcread)(dev, MC_DOW)) - 1;
ct.day = FROMREG((*sc->sc_mcread)(dev, MC_DOM));
ct.mon = FROMREG((*sc->sc_mcread)(dev, MC_MONTH));
year = FROMREG((*sc->sc_mcread)(dev, MC_YEAR));
year += sc->sc_year0;
if (sc->sc_flag & MC146818_NO_CENT_ADJUST) {
cent = (*sc->sc_getcent)(dev);
year += cent * 100;
} else if (year < POSIX_BASE_YEAR)
year += 100;
mtx_unlock_spin(&sc->sc_mtx);
ct.year = year;
return (clock_ct_to_ts(&ct, ts));
}
#ifdef notyet
int
mc146818_getsecs(device_t dev, int *secp)
{
struct mc146818_softc *sc;
int sec, timeout;
sc = device_get_softc(dev);
timeout = 1000000; /* XXX how long should we wait? */
for (;;) {
mtx_lock_spin(&sc->sc_mtx);
if (!((*sc->sc_mcread)(dev, MC_REGA) & MC_REGA_UIP)) {
sec = FROMREG((*sc->sc_mcread)(dev, MC_SEC));
mtx_unlock_spin(&sc->sc_mtx);
break;
}
mtx_unlock_spin(&sc->sc_mtx);
if (--timeout == 0) {
device_printf(dev, "%s: timeout\n", __func__);
return (EBUSY);
}
}
#undef FROMREG
*secp = sec;
return (0);
}
#endif
/*
* Set the time of day clock based on the value of the struct timespec arg.
* Return 0 on success, an error number otherwise.
*/
int
mc146818_settime(device_t dev, struct timespec *ts)
{
struct mc146818_softc *sc;
struct clocktime ct;
int cent, year;
sc = device_get_softc(dev);
/* Accuracy is only one second. */
if (ts->tv_nsec >= 500000000)
ts->tv_sec++;
ts->tv_nsec = 0;
clock_ts_to_ct(ts, &ct);
mtx_lock_spin(&sc->sc_mtx);
/* Disable RTC updates and interrupts (if enabled). */
(*sc->sc_mcwrite)(dev, MC_REGB,
((sc->sc_regb & (MC_REGB_BINARY | MC_REGB_24HR)) | MC_REGB_SET));
#define TOREG(x) ((sc->sc_flag & MC146818_BCD) ? TOBCD(x) : (x))
(*sc->sc_mcwrite)(dev, MC_SEC, TOREG(ct.sec));
(*sc->sc_mcwrite)(dev, MC_MIN, TOREG(ct.min));
(*sc->sc_mcwrite)(dev, MC_HOUR, TOREG(ct.hour));
/* Map dow from 0 - 6 to 1 - 7. */
(*sc->sc_mcwrite)(dev, MC_DOW, TOREG(ct.dow + 1));
(*sc->sc_mcwrite)(dev, MC_DOM, TOREG(ct.day));
(*sc->sc_mcwrite)(dev, MC_MONTH, TOREG(ct.mon));
year = ct.year - sc->sc_year0;
if (sc->sc_flag & MC146818_NO_CENT_ADJUST) {
cent = year / 100;
(*sc->sc_setcent)(dev, cent);
year -= cent * 100;
} else if (year > 99)
year -= 100;
(*sc->sc_mcwrite)(dev, MC_YEAR, TOREG(year));
/* Reenable RTC updates and interrupts. */
(*sc->sc_mcwrite)(dev, MC_REGB, sc->sc_regb);
mtx_unlock_spin(&sc->sc_mtx);
#undef TOREG
return (0);
}
#define MC_ADDR 0
#define MC_DATA 1
u_int
mc146818_def_read(device_t dev, u_int reg)
{
struct mc146818_softc *sc;
sc = device_get_softc(dev);
bus_space_write_1(sc->sc_bst, sc->sc_bsh, MC_ADDR, reg);
return (bus_space_read_1(sc->sc_bst, sc->sc_bsh, MC_DATA));
}
void
mc146818_def_write(device_t dev, u_int reg, u_int val)
{
struct mc146818_softc *sc;
sc = device_get_softc(dev);
bus_space_write_1(sc->sc_bst, sc->sc_bsh, MC_ADDR, reg);
bus_space_write_1(sc->sc_bst, sc->sc_bsh, MC_DATA, val);
}
#undef MC_ADDR
#undef MC_DATA
/*
* Looks like it's common even across platforms to store the century at
* 0x32 in the NVRAM of the mc146818.
*/
#define MC_CENT 0x32
static u_int
mc146818_def_getcent(device_t dev)
{
struct mc146818_softc *sc;
sc = device_get_softc(dev);
return ((*sc->sc_mcread)(dev, MC_CENT));
}
static void
mc146818_def_setcent(device_t dev, u_int cent)
{
struct mc146818_softc *sc;
sc = device_get_softc(dev);
(*sc->sc_mcwrite)(dev, MC_CENT, cent);
}
#undef MC_CENT