/*      $NetBSD: auxio.c,v 1.27 2023/12/20 05:33:58 thorpej Exp $       */

/*
* Copyright (c) 2000, 2001, 2015 Matthew R. Green
* 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.
*/

/*
* AUXIO registers support on the sbus & ebus2, used for the floppy driver
* and to control the system LED, for the BLINK option.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: auxio.c,v 1.27 2023/12/20 05:33:58 thorpej Exp $");

#include "opt_auxio.h"

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

#include <machine/autoconf.h>
#include <machine/cpu.h>

#include <dev/ebus/ebusreg.h>
#include <dev/ebus/ebusvar.h>
#include <dev/sbus/sbusvar.h>
#include <sparc64/dev/auxioreg.h>
#include <sparc64/dev/auxiovar.h>

static uint32_t auxio_read_led(struct auxio_softc *);
static void     auxio_write_led(struct auxio_softc *, uint32_t);
void    auxio_attach_common(struct auxio_softc *);

extern struct cfdriver auxio_cd;

static __inline__ uint32_t
auxio_read_led(struct auxio_softc *sc)
{
       uint32_t led;

       if (sc->sc_flags & AUXIO_EBUS)
               led = le32toh(bus_space_read_4(sc->sc_tag, sc->sc_led, 0));
       else
               led = bus_space_read_1(sc->sc_tag, sc->sc_led, 0);

       return led;
}

static __inline__ void
auxio_write_led(struct auxio_softc *sc, uint32_t led)
{

       if (sc->sc_flags & AUXIO_EBUS)
               bus_space_write_4(sc->sc_tag, sc->sc_led, 0, htole32(led));
       else
               bus_space_write_1(sc->sc_tag, sc->sc_led, 0, led);
}

#ifdef BLINK
static callout_t blink_ch;
static void auxio_blink(void *);

/* let someone disable it if it's already turned on; XXX sysctl? */
int do_blink = 1;

static void
auxio_blink(void *x)
{
       struct auxio_softc *sc = x;
       int s;
       uint32_t led;

       if (do_blink == 0)
               return;

       mutex_enter(&sc->sc_lock);
       led = auxio_read_led(sc);
       led = led ^ AUXIO_LED_LED;
       auxio_write_led(sc, led);
       mutex_exit(&sc->sc_lock);

       /*
        * 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.
        */
       s = (((averunnable.ldavg[0] + FSCALE) * hz) >> (FSHIFT + 1));
       callout_reset(&blink_ch, s, auxio_blink, sc);
}
#endif

void
auxio_attach_common(struct auxio_softc *sc)
{
       static int do_once = 1;

       /* only start one blinker */
       if (do_once) {
               mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_HIGH);
#ifdef BLINK
               callout_init(&blink_ch, CALLOUT_MPSAFE);
               auxio_blink(sc);
#endif
               do_once = 0;
       }
       printf("\n");
}

int
auxio_fd_control(u_int32_t bits)
{
       struct auxio_softc *sc;
       u_int32_t led;

       if (auxio_cd.cd_ndevs == 0) {
               return ENXIO;
       }

       /*
        * XXX This does not handle > 1 auxio correctly.
        * We'll assume the floppy drive is tied to first auxio found.
        */
       sc = device_lookup_private(&auxio_cd, 0);
       if (!sc) {
               return ENXIO;
       }

       mutex_enter(&sc->sc_lock);
       led = auxio_read_led(sc);
       led = (led & ~AUXIO_LED_FLOPPY_MASK) | bits;
       auxio_write_led(sc, led);
       mutex_exit(&sc->sc_lock);

       return 0;
}