NetBSD-5.0.2/sys/arch/hpcmips/tx/tx39clock.c
/* $NetBSD: tx39clock.c,v 1.23 2008/04/28 20:23:21 martin Exp $ */
/*-
* Copyright (c) 1999-2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by UCHIYAMA Yasushi.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: tx39clock.c,v 1.23 2008/04/28 20:23:21 martin Exp $");
#include "opt_tx39clock_debug.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/timetc.h>
#include <sys/device.h>
#include <sys/bus.h>
#include <dev/clock_subr.h>
#include <machine/sysconf.h>
#include <hpcmips/tx/tx39var.h>
#include <hpcmips/tx/tx39icureg.h>
#include <hpcmips/tx/tx39clockvar.h>
#include <hpcmips/tx/tx39clockreg.h>
#include <hpcmips/tx/tx39timerreg.h>
#ifdef TX39CLOCK_DEBUG
#define DPRINTF_ENABLE
#define DPRINTF_DEBUG tx39clock_debug
#endif
#include <machine/debug.h>
#define ISSETPRINT(r, m) \
dbg_bitmask_print(r, TX39_CLOCK_EN ## m ## CLK, #m)
void tx39clock_init(struct device *);
struct platform_clock tx39_clock = {
#define CLOCK_RATE 100
CLOCK_RATE, tx39clock_init,
};
struct txtime {
u_int32_t t_hi;
u_int32_t t_lo;
};
struct tx39clock_softc {
struct device sc_dev;
tx_chipset_tag_t sc_tc;
int sc_alarm;
int sc_enabled;
int sc_year;
struct clock_ymdhms sc_epoch;
struct timecounter sc_tcounter;
};
int tx39clock_match(struct device *, struct cfdata *, void *);
void tx39clock_attach(struct device *, struct device *, void *);
#ifdef TX39CLOCK_DEBUG
void tx39clock_dump(tx_chipset_tag_t);
#endif
void tx39clock_cpuspeed(int *, int *);
void __tx39timer_rtcfreeze(tx_chipset_tag_t);
void __tx39timer_rtcreset(tx_chipset_tag_t);
inline void __tx39timer_rtcget(struct txtime *);
inline time_t __tx39timer_rtc2sec(struct txtime *);
uint32_t tx39_timecount(struct timecounter *);
CFATTACH_DECL(tx39clock, sizeof(struct tx39clock_softc),
tx39clock_match, tx39clock_attach, NULL, NULL);
int
tx39clock_match(struct device *parent, struct cfdata *cf, void *aux)
{
return (ATTACH_FIRST);
}
void
tx39clock_attach(struct device *parent, struct device *self, void *aux)
{
struct txsim_attach_args *ta = aux;
struct tx39clock_softc *sc = (void*)self;
tx_chipset_tag_t tc;
txreg_t reg;
tc = sc->sc_tc = ta->ta_tc;
tx_conf_register_clock(tc, self);
/* Reset timer module */
tx_conf_write(tc, TX39_TIMERCONTROL_REG, 0);
/* Enable periodic timer */
reg = tx_conf_read(tc, TX39_TIMERCONTROL_REG);
reg |= TX39_TIMERCONTROL_ENPERTIMER;
tx_conf_write(tc, TX39_TIMERCONTROL_REG, reg);
sc->sc_enabled = 0;
/*
* RTC and ALARM
* RTCINT ... INTR5 bit 31 (roll over)
* ALARMINT ... INTR5 bit 30
* PERINT ... INTR5 bit 29
*/
platform_clock_attach(self, &tx39_clock);
#ifdef TX39CLOCK_DEBUG
tx39clock_dump(tc);
#endif /* TX39CLOCK_DEBUG */
}
/*
* cpuclock ... CPU clock (Hz)
* cpuspeed ... instructions-per-microsecond
*/
void
tx39clock_cpuspeed(int *cpuclock, int *cpu_speed)
{
struct txtime t0, t1;
int elapsed;
__tx39timer_rtcget(&t0);
__asm volatile(
".set noreorder; \n\t"
"li $8, 10000000; \n"
"1: nop; \n\t"
"nop; \n\t"
"nop; \n\t"
"nop; \n\t"
"nop; \n\t"
"nop; \n\t"
"nop; \n\t"
"add $8, $8, -1; \n\t"
"bnez $8, 1b; \n\t"
"nop; \n\t"
".set reorder;");
__tx39timer_rtcget(&t1);
elapsed = t1.t_lo - t0.t_lo;
*cpuclock = (100000000 / elapsed) * TX39_RTCLOCK;
*cpu_speed = *cpuclock / 1000000;
}
void
__tx39timer_rtcfreeze(tx_chipset_tag_t tc)
{
txreg_t reg;
reg = tx_conf_read(tc, TX39_TIMERCONTROL_REG);
/* Freeze RTC */
reg |= TX39_TIMERCONTROL_FREEZEPRE; /* Upper 8bit */
reg |= TX39_TIMERCONTROL_FREEZERTC; /* Lower 32bit */
/* Freeze periodic timer */
reg |= TX39_TIMERCONTROL_FREEZETIMER;
reg &= ~TX39_TIMERCONTROL_ENPERTIMER;
tx_conf_write(tc, TX39_TIMERCONTROL_REG, reg);
}
inline void
__tx39timer_rtcget(struct txtime *t)
{
tx_chipset_tag_t tc;
txreg_t reghi, reglo, oreghi, oreglo;
int retry;
tc = tx_conf_get_tag();
retry = 10;
do {
oreglo = tx_conf_read(tc, TX39_TIMERRTCLO_REG);
reglo = tx_conf_read(tc, TX39_TIMERRTCLO_REG);
oreghi = tx_conf_read(tc, TX39_TIMERRTCHI_REG);
reghi = tx_conf_read(tc, TX39_TIMERRTCHI_REG);
} while ((reghi != oreghi || reglo != oreglo) && (--retry > 0));
if (retry < 0) {
printf("RTC timer read error.\n");
}
t->t_hi = TX39_TIMERRTCHI(reghi);
t->t_lo = reglo;
}
void
__tx39timer_rtcreset(tx_chipset_tag_t tc)
{
txreg_t reg;
reg = tx_conf_read(tc, TX39_TIMERCONTROL_REG);
/* Reset counter and stop */
reg |= TX39_TIMERCONTROL_RTCCLR;
tx_conf_write(tc, TX39_TIMERCONTROL_REG, reg);
/* Count again */
reg &= ~TX39_TIMERCONTROL_RTCCLR;
tx_conf_write(tc, TX39_TIMERCONTROL_REG, reg);
}
uint32_t
tx39_timecount(struct timecounter *tch)
{
tx_chipset_tag_t tc = tch->tc_priv;
/*
* since we're only reading the low register, we don't care about
* if the chip increments it. we assume that the single read will
* always be consistent. This is much faster than the routine which
* has to get both values, improving the quality.
*/
return (tx_conf_read(tc, TX39_TIMERRTCLO_REG));
}
void
tx39clock_init(struct device *dev)
{
struct tx39clock_softc *sc = (void*)dev;
tx_chipset_tag_t tc = sc->sc_tc;
txreg_t reg;
int pcnt;
/*
* Setup periodic timer (interrupting hz times per second.)
*/
pcnt = TX39_TIMERCLK / CLOCK_RATE - 1;
reg = tx_conf_read(tc, TX39_TIMERPERIODIC_REG);
TX39_TIMERPERIODIC_PERVAL_CLR(reg);
reg = TX39_TIMERPERIODIC_PERVAL_SET(reg, pcnt);
tx_conf_write(tc, TX39_TIMERPERIODIC_REG, reg);
/*
* Enable periodic timer
*/
reg = tx_conf_read(tc, TX39_INTRENABLE6_REG);
reg |= TX39_INTRPRI13_TIMER_PERIODIC_BIT;
tx_conf_write(tc, TX39_INTRENABLE6_REG, reg);
sc->sc_tcounter.tc_name = "tx39rtc";
sc->sc_tcounter.tc_get_timecount = tx39_timecount;
sc->sc_tcounter.tc_priv = tc;
sc->sc_tcounter.tc_counter_mask = 0xffffffff;
sc->sc_tcounter.tc_frequency = TX39_RTCLOCK;
sc->sc_tcounter.tc_quality = 100;
tc_init(&sc->sc_tcounter);
}
int
tx39clock_alarm_set(tx_chipset_tag_t tc, int msec)
{
struct tx39clock_softc *sc = tc->tc_clockt;
sc->sc_alarm = TX39_MSEC2RTC(msec);
tx39clock_alarm_refill(tc);
return (0);
}
void
tx39clock_alarm_refill(tx_chipset_tag_t tc)
{
struct tx39clock_softc *sc = tc->tc_clockt;
struct txtime t;
u_int64_t mytime;
__tx39timer_rtcget(&t);
mytime = ((u_int64_t)t.t_hi << 32) | (u_int64_t)t.t_lo;
mytime += (u_int64_t)sc->sc_alarm;
t.t_hi = (u_int32_t)((mytime >> 32) & TX39_TIMERALARMHI_MASK);
t.t_lo = (u_int32_t)(mytime & 0xffffffff);
tx_conf_write(tc, TX39_TIMERALARMHI_REG, t.t_hi);
tx_conf_write(tc, TX39_TIMERALARMLO_REG, t.t_lo);
}
#ifdef TX39CLOCK_DEBUG
void
tx39clock_dump(tx_chipset_tag_t tc)
{
txreg_t reg;
reg = tx_conf_read(tc, TX39_CLOCKCTRL_REG);
printf(" ");
ISSETPRINT(reg, CHIM);
#ifdef TX391X
ISSETPRINT(reg, VID);
ISSETPRINT(reg, MBUS);
#endif /* TX391X */
#ifdef TX392X
ISSETPRINT(reg, IRDA);
#endif /* TX392X */
ISSETPRINT(reg, SPI);
ISSETPRINT(reg, TIMER);
ISSETPRINT(reg, FASTTIMER);
#ifdef TX392X
ISSETPRINT(reg, C48MOUT);
#endif /* TX392X */
ISSETPRINT(reg, SIBM);
ISSETPRINT(reg, CSER);
ISSETPRINT(reg, IR);
ISSETPRINT(reg, UARTA);
ISSETPRINT(reg, UARTB);
printf("\n");
}
#endif /* TX39CLOCK_DEBUG */