/*      $NetBSD: clock_pcc.c,v 1.20 2012/10/27 17:18:04 chs Exp $       */

/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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.
*/

/*
* Glue for the Peripheral Channel Controller timers and the
* Mostek clock chip found on the MVME-147.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: clock_pcc.c,v 1.20 2012/10/27 17:18:04 chs Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/timetc.h>

#include <machine/psl.h>
#include <machine/bus.h>

#include <dev/mvme/clockvar.h>

#include <mvme68k/dev/pccreg.h>
#include <mvme68k/dev/pccvar.h>

#include "ioconf.h"

int clock_pcc_match(device_t, cfdata_t, void *);
void clock_pcc_attach(device_t, device_t, void *);

struct clock_pcc_softc {
       struct clock_attach_args sc_clock_args;
       u_char sc_clock_lvl;
       struct timecounter sc_tc;
};

CFATTACH_DECL_NEW(clock_pcc, sizeof(struct clock_pcc_softc),
   clock_pcc_match, clock_pcc_attach, NULL, NULL);


static int clock_pcc_profintr(void *);
static int clock_pcc_statintr(void *);
static void clock_pcc_initclocks(void *, int, int);
static u_int clock_pcc_getcount(struct timecounter *);
static void clock_pcc_shutdown(void *);

static struct clock_pcc_softc *clock_pcc_sc;
static uint32_t clock_pcc_count;
static uint16_t clock_pcc_reload;

/* ARGSUSED */
int
clock_pcc_match(device_t parent, cfdata_t cf, void *aux)
{
       struct pcc_attach_args *pa;

       pa = aux;

       /* Only one clock, please. */
       if (clock_pcc_sc)
               return 0;

       if (strcmp(pa->pa_name, clock_cd.cd_name))
               return 0;

       pa->pa_ipl = cf->pcccf_ipl;

       return 1;
}

/* ARGSUSED */
void
clock_pcc_attach(device_t parent, device_t self, void *aux)
{
       struct pcc_attach_args *pa;
       struct clock_pcc_softc *sc;

       sc = device_private(self);
       pa = aux;

       if (pa->pa_ipl != CLOCK_LEVEL)
               panic("clock_pcc_attach: wrong interrupt level");

       clock_pcc_sc = sc;
       sc->sc_clock_args.ca_arg = sc;
       sc->sc_clock_args.ca_initfunc = clock_pcc_initclocks;

       /* Do common portions of clock config. */
       clock_config(self, &sc->sc_clock_args, pccintr_evcnt(pa->pa_ipl));

       /* Ensure our interrupts get disabled at shutdown time. */
       (void)shutdownhook_establish(clock_pcc_shutdown, NULL);

       /* Attach the interrupt handlers. */
       pccintr_establish(PCCV_TIMER1, clock_pcc_profintr, pa->pa_ipl,
           NULL, &clock_profcnt);
       pccintr_establish(PCCV_TIMER2, clock_pcc_statintr, pa->pa_ipl,
           NULL, &clock_statcnt);
       sc->sc_clock_lvl = pa->pa_ipl | PCC_IENABLE | PCC_TIMERACK;
}

void
clock_pcc_initclocks(void *arg, int prof_us, int stat_us)
{
       struct clock_pcc_softc *sc = arg;

       clock_pcc_reload = pcc_timer_us2lim(prof_us);
       pcc_reg_write16(sys_pcc, PCCREG_TMR1_PRELOAD, clock_pcc_reload);
       pcc_reg_write(sys_pcc, PCCREG_TMR1_CONTROL, PCC_TIMERCLEAR);
       pcc_reg_write(sys_pcc, PCCREG_TMR1_CONTROL, PCC_TIMERSTART);
       pcc_reg_write(sys_pcc, PCCREG_TMR1_INTR_CTRL, sc->sc_clock_lvl);

       pcc_reg_write16(sys_pcc, PCCREG_TMR2_PRELOAD,
           pcc_timer_us2lim(stat_us));
       pcc_reg_write(sys_pcc, PCCREG_TMR2_CONTROL, PCC_TIMERCLEAR);
       pcc_reg_write(sys_pcc, PCCREG_TMR2_CONTROL, PCC_TIMERSTART);
       pcc_reg_write(sys_pcc, PCCREG_TMR2_INTR_CTRL, sc->sc_clock_lvl);

       sc->sc_tc.tc_get_timecount = clock_pcc_getcount;
       sc->sc_tc.tc_name = "pcc_count";
       sc->sc_tc.tc_frequency = PCC_TIMERFREQ;
       sc->sc_tc.tc_quality = 100;
       sc->sc_tc.tc_counter_mask = ~0;
       tc_init(&sc->sc_tc);
}

/* ARGSUSED */
u_int
clock_pcc_getcount(struct timecounter *tc)
{
       u_int cnt;
       uint16_t tc1, tc2;
       uint8_t cr;
       int s;

       s = splhigh();

       /*
        * There's no way to latch the counter and overflow registers
        * without pausing the clock, so compensate for the possible
        * race by checking for counter wrap-around and re-reading the
        * overflow counter if necessary.
        *
        * Note: This only works because we're at splhigh().
        */
       tc1 = pcc_reg_read16(sys_pcc, PCCREG_TMR1_COUNT);
       cr = pcc_reg_read(sys_pcc, PCCREG_TMR1_CONTROL);
       tc2 = pcc_reg_read16(sys_pcc, PCCREG_TMR1_COUNT);
       if (tc1 > tc2) {
               cr = pcc_reg_read(sys_pcc, PCCREG_TMR1_CONTROL);
               tc1 = tc2;
       }
       cnt = clock_pcc_count;
       splx(s);
       /* XXX assume HZ == 100 */
       cnt += (tc1 - clock_pcc_reload) +
           (PCC_TIMERFREQ / 100) * (cr >> PCC_TIMEROVFLSHIFT);

       return cnt;
}

int
clock_pcc_profintr(void *frame)
{
       uint8_t cr;
       uint16_t tc;
       int s;

       s = splhigh();
       tc = pcc_reg_read16(sys_pcc, PCCREG_TMR1_COUNT);
       cr = pcc_reg_read(sys_pcc, PCCREG_TMR1_CONTROL);
       if (tc > pcc_reg_read16(sys_pcc, PCCREG_TMR1_COUNT))
               cr = pcc_reg_read(sys_pcc, PCCREG_TMR1_CONTROL);
       pcc_reg_write(sys_pcc, PCCREG_TMR1_CONTROL, PCC_TIMERSTART);
       pcc_reg_write(sys_pcc, PCCREG_TMR1_INTR_CTRL,
           clock_pcc_sc->sc_clock_lvl);
       splx(s);

       for (cr >>= PCC_TIMEROVFLSHIFT; cr; cr--) {
               /* XXX assume HZ == 100 */
               clock_pcc_count += PCC_TIMERFREQ / 100;
               hardclock(frame);
       }

       return 1;
}

int
clock_pcc_statintr(void *frame)
{

       /* Disable the timer interrupt while we handle it. */
       pcc_reg_write(sys_pcc, PCCREG_TMR2_INTR_CTRL, 0);

       statclock((struct clockframe *) frame);

       pcc_reg_write16(sys_pcc, PCCREG_TMR2_PRELOAD,
           pcc_timer_us2lim(CLOCK_NEWINT(clock_statvar, clock_statmin)));
       pcc_reg_write(sys_pcc, PCCREG_TMR2_CONTROL, PCC_TIMERCLEAR);
       pcc_reg_write(sys_pcc, PCCREG_TMR2_CONTROL, PCC_TIMERSTART);

       pcc_reg_write(sys_pcc, PCCREG_TMR2_INTR_CTRL,
           clock_pcc_sc->sc_clock_lvl);

       return 1;
}

/* ARGSUSED */
void
clock_pcc_shutdown(void *arg)
{

       /* Make sure the timer interrupts are turned off. */
       pcc_reg_write(sys_pcc, PCCREG_TMR1_CONTROL, PCC_TIMERCLEAR);
       pcc_reg_write(sys_pcc, PCCREG_TMR1_INTR_CTRL, 0);
       pcc_reg_write(sys_pcc, PCCREG_TMR2_CONTROL, PCC_TIMERCLEAR);
       pcc_reg_write(sys_pcc, PCCREG_TMR2_INTR_CTRL, 0);
}

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