/*      $NetBSD: siop_gsc.c,v 1.1 2014/02/24 07:23:43 skrll Exp $       */

/*      $OpenBSD: siop_gsc.c,v 1.4 2007/08/23 21:01:22 kettenis Exp $   */

/*
* Copyright (c) 2007 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: siop_gsc.c,v 1.1 2014/02/24 07:23:43 skrll Exp $");

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

#include <uvm/uvm_extern.h>

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

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

#include <dev/ic/siopreg.h>
#include <dev/ic/siopvar_common.h>
#include <dev/ic/siopvar.h>

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

#define SIOP_GSC_RESET  0x0000
#define SIOP_GSC_OFFSET 0x0100

int siop_gsc_match(device_t, cfdata_t, void *);
void siop_gsc_attach(device_t, device_t, void *);
int siop_gsc_intr(void *);
void siop_gsc_reset(struct siop_common_softc *);

uint8_t siop_gsc_r1(void *, bus_space_handle_t, bus_size_t);
uint16_t siop_gsc_r2(void *, bus_space_handle_t, bus_size_t);
void siop_gsc_w1(void *, bus_space_handle_t, bus_size_t, uint8_t);
void siop_gsc_w2(void *, bus_space_handle_t, bus_size_t, uint16_t);

struct siop_gsc_softc {
       struct siop_softc sc_siop;
       bus_space_tag_t sc_iot;
       bus_space_handle_t sc_ioh;
       struct hppa_bus_space_tag sc_bustag;
};

CFATTACH_DECL_NEW(siop_gsc, sizeof(struct siop_gsc_softc),
   siop_gsc_match, siop_gsc_attach, NULL, NULL);

int
siop_gsc_match(device_t parent, cfdata_t match, void *aux)
{
       struct gsc_attach_args *ga = aux;

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

       return 1;
}

void
siop_gsc_attach(device_t parent, device_t self, void *aux)
{
       struct siop_gsc_softc *gsc = device_private(self);
       struct siop_softc *sc = &gsc->sc_siop;
       struct gsc_attach_args *ga = aux;

       sc->sc_c.sc_dev = self;
       gsc->sc_iot = ga->ga_iot;
       if (bus_space_map(gsc->sc_iot, ga->ga_hpa,
           IOMOD_HPASIZE, 0, &gsc->sc_ioh)) {
               aprint_error(": can't map io space\n");
               return;
       }

       gsc->sc_bustag = *gsc->sc_iot;
       gsc->sc_bustag.hbt_r1 = siop_gsc_r1;
       gsc->sc_bustag.hbt_r2 = siop_gsc_r2;
       gsc->sc_bustag.hbt_w1 = siop_gsc_w1;
       gsc->sc_bustag.hbt_w2 = siop_gsc_w2;

       sc->sc_c.features = SF_CHIP_PF | SF_CHIP_BE | SF_BUS_WIDE;
       sc->sc_c.maxburst = 4;
       sc->sc_c.maxoff = 8;
       sc->sc_c.clock_div = 3;
       sc->sc_c.clock_period = 250;
       sc->sc_c.ram_size = 0;

       sc->sc_c.sc_reset = siop_gsc_reset;
       sc->sc_c.sc_dmat = ga->ga_dmatag;

       sc->sc_c.sc_rt = &gsc->sc_bustag;
       bus_space_subregion(gsc->sc_iot, gsc->sc_ioh, SIOP_GSC_OFFSET,
           IOMOD_HPASIZE - SIOP_GSC_OFFSET, &sc->sc_c.sc_rh);

       /*
        * Reset the SCSI subsystem.
        */
       bus_space_write_1(gsc->sc_iot, gsc->sc_ioh, SIOP_GSC_RESET, 0);
       DELAY(1000);
       siop_gsc_reset(&sc->sc_c);

       aprint_normal(": NCR53C720 rev %d\n", bus_space_read_1(sc->sc_c.sc_rt,
           sc->sc_c.sc_rh, SIOP_CTEST3) >> 4);

       siop_attach(sc);

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

}

void
siop_gsc_reset(struct siop_common_softc *sc)
{
       bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_DCNTL, DCNTL_EA);
       bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_CTEST0, CTEST0_EHP);
       bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_CTEST4, CTEST4_MUX);

       bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_STIME0,
           (0xc << STIME0_SEL_SHIFT));
}

uint8_t
siop_gsc_r1(void *v, bus_space_handle_t h, bus_size_t o)
{
       return *(volatile uint8_t *)(h + (o ^ 3));
}

uint16_t
siop_gsc_r2(void *v, bus_space_handle_t h, bus_size_t o)
{
       if (o == SIOP_SIST0) {
               uint16_t reg;

               reg = siop_gsc_r1(v, h, SIOP_SIST0);
               reg |= siop_gsc_r1(v, h, SIOP_SIST1) << 8;
               return reg;
       }
       return *(volatile uint16_t *)(h + (o ^ 2));
}

void
siop_gsc_w1(void *v, bus_space_handle_t h, bus_size_t o, uint8_t vv)
{
       *(volatile uint8_t *)(h + (o ^ 3)) = vv;
}

void
siop_gsc_w2(void *v, bus_space_handle_t h, bus_size_t o, uint16_t vv)
{
       *(volatile uint16_t *)(h + (o ^ 2)) = vv;
}

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