/*      $NetBSD: osiop_gsc.c,v 1.2 2022/09/29 06:39:58 skrll Exp $      */

/*
* Copyright (c) 2001 Matt Fredette.  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 AUTHORS ``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 AUTHORS 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.
*/

/*-
* Copyright (c) 2001, 2002 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 AUTHORS ``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 AUTHORS 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.
*/

/*      $OpenBSD: siop_gsc.c,v 1.1 1998/11/04 17:01:35 mickey Exp $     */

/*
* Copyright (c) 1998 Michael Shalayeff
* 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: osiop_gsc.c,v 1.2 2022/09/29 06:39:58 skrll Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/buf.h>

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>

#include <machine/cpu.h>
#include <machine/intr.h>
#include <machine/iomod.h>
#include <machine/autoconf.h>
#include <sys/bus.h>

#include <dev/ic/osiopreg.h>
#include <dev/ic/osiopvar.h>

#include <hppa/dev/cpudevs.h>
#include <hppa/gsc/gscbusvar.h>
#include <hppa/hppa/machdep.h>

#define OSIOP_GSC_RESET         0x0000
#define OSIOP_GSC_OFFSET        0x0100

int osiop_gsc_match(device_t, cfdata_t, void *);
void osiop_gsc_attach(device_t, device_t, void *);
int osiop_gsc_intr(void *);

CFATTACH_DECL_NEW(osiop_gsc, sizeof(struct osiop_softc),
   osiop_gsc_match, osiop_gsc_attach, NULL, NULL);

int
osiop_gsc_match(device_t parent, cfdata_t cf, void *aux)
{
       struct gsc_attach_args *ga = aux;
       bus_space_handle_t ioh;
       int rv = 1;

       if (ga->ga_type.iodc_type != HPPA_TYPE_FIO ||
           (ga->ga_type.iodc_sv_model != HPPA_FIO_GSCSI))
               return 0;

       if (bus_space_map(ga->ga_iot, ga->ga_hpa,
           OSIOP_GSC_OFFSET + OSIOP_NREGS, 0, &ioh))
               return 0;


       bus_space_unmap(ga->ga_iot, ioh, OSIOP_GSC_OFFSET + OSIOP_NREGS);
       return rv;
}

void
osiop_gsc_attach(device_t parent, device_t self, void *aux)
{
       struct osiop_softc *sc = device_private(self);
       struct gsc_attach_args *ga = aux;
       bus_space_handle_t ioh;

       sc->sc_dev = self;
       sc->sc_bst = ga->ga_iot;
       sc->sc_dmat = ga->ga_dmatag;
       if (bus_space_map(sc->sc_bst, ga->ga_hpa,
           OSIOP_GSC_OFFSET + OSIOP_NREGS, 0, &ioh)) {
               aprint_error(": couldn't map I/O ports\n");
               return;
       }
       if (bus_space_subregion(sc->sc_bst, ioh,
           OSIOP_GSC_OFFSET, OSIOP_NREGS, &sc->sc_reg)) {
               aprint_error(": couldn't get chip ports\n");
               return;
       }

       sc->sc_clock_freq = ga->ga_ca.ca_pir.filler2[14] / 1000000;
       if (!sc->sc_clock_freq)
               sc->sc_clock_freq = 50;

       sc->sc_ctest7 = 0; /* | OSIOP_CTEST7_TT1 */
       sc->sc_dcntl = OSIOP_DCNTL_EA;

       sc->sc_flags = 0;
       sc->sc_id = ga->ga_scsi_target;

       /*
        * Reset the SCSI subsystem.
        */
       bus_space_write_1(sc->sc_bst, ioh, OSIOP_GSC_RESET, 0);
       DELAY(1000);

       /*
        * Call common attachment
        */
#ifdef OSIOP_DEBUG
       {
               extern int osiop_debug;
               osiop_debug = -1;
       }
#endif /* OSIOP_DEBUG */
       osiop_attach(sc);

       (void)hppa_intr_establish(IPL_BIO, osiop_gsc_intr, sc, ga->ga_ir,
           ga->ga_irq);
}

/*
* interrupt handler
*/
int
osiop_gsc_intr(void *arg)
{
       struct osiop_softc *sc = arg;
       uint8_t istat;

       /* This is potentially nasty, since the IRQ is level triggered... */
       if (sc->sc_flags & OSIOP_INTSOFF)
               return (0);

       istat = osiop_read_1(sc, OSIOP_ISTAT);

       if ((istat & (OSIOP_ISTAT_SIP | OSIOP_ISTAT_DIP)) == 0)
               return (0);

       /* Save interrupt details for the back-end interrupt handler */
       sc->sc_sstat0 = osiop_read_1(sc, OSIOP_SSTAT0);
       sc->sc_istat = istat;
       /*
        * Per page 4-18 of the LSI 53C710 Technical Manual,
        * "insert a delay equivalent to 12 BCLK periods between
        * the reads [of DSTAT and SSTAT0] to ensure that the
        * interrupts clear properly."
        */
       DELAY(100);
       sc->sc_dstat = osiop_read_1(sc, OSIOP_DSTAT);

       /* Deal with the interrupt */
       osiop_intr(sc);

       /* Blink the LED. */
       hppa_led_blink(HPPA_LED_DISK);

       return (1);
}

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