/*      $NetBSD: ctl.c,v 1.4 2015/02/18 16:47:58 macallan Exp $  */

/*
* Copyright (c) 2009 Stephen M. Rumble
* 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.
* 3. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ctl.c,v 1.4 2015/02/18 16:47:58 macallan Exp $");

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

#include <machine/cpu.h>
#include <machine/locore.h>
#include <machine/autoconf.h>
#include <sys/bus.h>
#include <machine/machtype.h>
#include <machine/sysconf.h>

#include <sgimips/dev/ctlreg.h>

struct ctl_softc {
       device_t                sc_dev;

       bus_space_tag_t         iot;
       bus_space_handle_t      ioh;
};

static int      ctl_match(device_t, cfdata_t, void *);
static void     ctl_attach(device_t, device_t, void *);
static void     ctl_bus_reset(void);
static void     ctl_bus_error(vaddr_t, uint32_t, uint32_t);
static void     ctl_watchdog_enable(void);
static void     ctl_watchdog_disable(void);
static void     ctl_watchdog_tickle(void);

#if defined(BLINK)
static callout_t ctl_blink_ch;
static void     ctl_blink(void *);
#endif

CFATTACH_DECL_NEW(ctl, sizeof(struct ctl_softc),
   ctl_match, ctl_attach, NULL, NULL);

static struct ctl_softc *csc;

static int
ctl_match(device_t parent, cfdata_t match, void *aux)
{
       if (csc != NULL)
               return 0;

       /*
        * CTL exists on IP6/IP10 systems.
        */
       if (mach_type == MACH_SGI_IP6 || mach_type == MACH_SGI_IP10)
               return 1;
       else
               return 0;
}

static void
ctl_attach(device_t parent, device_t self, void *aux)
{
       struct mainbus_attach_args *ma = aux;
       struct ctl_softc * const sc = device_private(self);

#ifdef BLINK
       callout_init(&ctl_blink_ch, 0);
#endif

       sc->sc_dev = self;
       csc = sc;

       sc->iot = normal_memt;
       if (bus_space_map(sc->iot, ma->ma_addr, 0x10000 /* XXX */,
           BUS_SPACE_MAP_LINEAR, &sc->ioh))
               panic("ctl_attach: could not allocate memory\n");

       platform.bus_reset = ctl_bus_reset;
       platform.intr5 = ctl_bus_error;
       platform.watchdog_enable = ctl_watchdog_enable;
       platform.watchdog_disable = ctl_watchdog_disable;
       platform.watchdog_reset = ctl_watchdog_tickle;

       bus_space_write_2(sc->iot, sc->ioh, CTL_CPUCTRL,
           (CTL_CPUCTRL_PARITY | CTL_CPUCTRL_SLAVE));

       printf("\n");

       ctl_bus_reset();

#if defined(BLINK)
       ctl_blink(sc);
#endif
}

static void
ctl_bus_reset(void)
{
       struct ctl_softc * const sc = csc;

       bus_space_read_1(sc->iot, sc->ioh, CTL_LAN_PAR_CLR);
       bus_space_read_1(sc->iot, sc->ioh, CTL_DMA_PAR_CLR);
       bus_space_read_1(sc->iot, sc->ioh, CTL_CPU_PAR_CLR);
       bus_space_read_1(sc->iot, sc->ioh, CTL_VME_PAR_CLR);
}

static void
ctl_bus_error(vaddr_t pc, uint32_t status, uint32_t ipending)
{

       printf("ctl0: bus error\n");
       ctl_bus_reset();
}

static void
ctl_watchdog_enable(void)
{
       struct ctl_softc * const sc = csc;
       uint32_t reg;

       /* XXX- doesn't seem to work properly */
       return;

       reg = bus_space_read_2(sc->iot, sc->ioh, CTL_CPUCTRL);
       reg |= CTL_CPUCTRL_WDOG;
       bus_space_write_2(sc->iot, sc->ioh, CTL_CPUCTRL, reg);
}

static void
ctl_watchdog_disable(void)
{
       struct ctl_softc * const sc = csc;
       uint16_t reg;

       /* XXX- doesn't seem to work properly */
       return;

       reg = bus_space_read_2(sc->iot, sc->ioh, CTL_CPUCTRL_WDOG);
       reg &= ~(CTL_CPUCTRL_WDOG);
       bus_space_write_2(sc->iot, sc->ioh, CTL_CPUCTRL, reg);
}

static void
ctl_watchdog_tickle(void)
{

       ctl_watchdog_disable();
       ctl_watchdog_enable();
}

#if defined(BLINK)
static void
ctl_blink(void *arg)
{
       struct ctl_softc *sc = arg;
       int s, value;

       s = splhigh();

       value = bus_space_read_1(sc->iot, sc->ioh, CTL_AUX_CPUCTRL);
       value ^= CTL_AUX_CPUCTRL_CONSLED;
       bus_space_write_1(sc->iot, sc->ioh, CTL_AUX_CPUCTRL, value);
       splx(s);

       /*
        * Blink rate is:
        *      full cycle every second if completely idle (loadav = 0)
        *      full cycle every 2 seconds if loadav = 1
        *      full cycle every 3 seconds if loadav = 2
        * etc.
        */
       int ticks = ((averunnable.ldavg[0] + FSCALE) * hz) >> (FSHIFT + 1);
       callout_reset(&ctl_blink_ch, ticks, ctl_blink, sc);
}
#endif