/*      $NetBSD: sti_dio.c,v 1.4 2025/05/28 17:33:38 tsutsui Exp $      */
/*      $OpenBSD: sti_dio.c,v 1.1 2011/08/18 20:02:57 miod Exp $        */

/*
* Copyright (c) 2005, 2011, Miodrag Vallat
*
* 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.
*
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sti_dio.c,v 1.4 2025/05/28 17:33:38 tsutsui Exp $");

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

#include <machine/autoconf.h>

#include <hp300/dev/dioreg.h>
#include <hp300/dev/diovar.h>
#include <hp300/dev/diodevs.h>
#include <hp300/dev/sti_diovar.h>
#include <hp300/dev/sti_machdep.h>

static int  sti_dio_match(device_t, cfdata_t, void *);
static void sti_dio_attach(device_t, device_t, void *);

static int sti_dio_probe(bus_space_tag_t, int);

CFATTACH_DECL_NEW(sti_dio, sizeof(struct sti_machdep_softc),
   sti_dio_match, sti_dio_attach, NULL, NULL);

static int
sti_dio_match(device_t parent, cfdata_t cf, void *aux)
{
       struct dio_attach_args *da = aux;

       if (da->da_id != DIO_DEVICE_ID_FRAMEBUFFER ||
           (da->da_secid != DIO_DEVICE_SECID_A1474MID &&
            da->da_secid != DIO_DEVICE_SECID_A147xVGA))
               return 0;

       /*
        * If we already probed it successfully as a console device, go ahead,
        * since we will not be able to bus_space_map() again.
        */
       if (da->da_scode == conscode ||
           sti_dio_probe(da->da_bst, da->da_scode) != 0)
               return 10;      /* Beat old gendiofb(4) */

       return 0;
}

static void
sti_dio_attach(device_t parent, device_t self, void *aux)
{
       struct sti_machdep_softc *sc = device_private(self);
       struct sti_softc *ssc = &sc->sc_sti;
       struct dio_attach_args *da = aux;
       bus_addr_t base;
       bus_space_tag_t bst;
       bus_space_handle_t romh;
       u_int romend;
       int i;

       ssc->sc_dev = self;
       bst = da->da_bst;

       base = (paddr_t)dio_scodetopa(da->da_scode + STI_DIO_SCODE_OFFSET);
       sc->sc_base = base;

       /*
        * If we already probed it successfully as a console device, go ahead,
        * since we will not be able to bus_space_map() again.
        */
       if (da->da_scode == conscode) {
               sti_machdep_attach_console(sc);
       } else {
               if (bus_space_map(bst, base, PAGE_SIZE, 0, &romh)) {
                       aprint_error(": can't map frame buffer");
                       return;
               }

               /*
                * Compute real PROM size
                */
               romend = sti_rom_size(bst, romh);

               bus_space_unmap(bst, romh, PAGE_SIZE);

               if (bus_space_map(bst, base, romend, 0, &romh)) {
                       aprint_error(": can't map frame buffer");
                       return;
               }

               ssc->bases[0] = romh;
               for (i = 1; i < STI_REGION_MAX; i++)
                       ssc->bases[i] = base;

               if (sti_attach_common(ssc, bst, bst, romh,
                   STI_CODEBASE_M68K) != 0)
                       return;
       }

       sti_machdep_attach(sc);
}

static int
sti_dio_probe(bus_space_tag_t bst, int scode)
{
       bus_space_handle_t bsh;
       bus_addr_t addr, base;
       int devtype;
       u_int span;

       /*
        * Sanity checks:
        * these devices provide both a DIO and an STI ROM. We expect the
        * DIO ROM to be a DIO-II ROM (i.e. to be at a DIO-II select code)
        * and report the device as spanning at least four select codes.
        */

       if (!DIO_ISDIOII(scode))
               return 0;

       addr = (bus_addr_t)dio_scodetopa(scode);
       if (bus_space_map(bst, addr, PAGE_SIZE, 0, &bsh))
               return 0;
       span = bus_space_read_1(bst, bsh, DIOII_SIZEOFF);
       bus_space_unmap(bst, bsh, PAGE_SIZE);

       if (span < STI_DIO_SIZE - 1)
               return 0;

       base = (bus_addr_t)dio_scodetopa(scode + STI_DIO_SCODE_OFFSET);
       if (bus_space_map(bst, base, PAGE_SIZE, 0, &bsh))
               return 0;
       devtype = bus_space_read_1(bst, bsh, 3);
       bus_space_unmap(bst, bsh, PAGE_SIZE);

       if (devtype != STI_DEVTYPE1 && devtype != STI_DEVTYPE4)
               return 0;

       return 1;
}

int
sti_dio_cnprobe(bus_space_tag_t bst, bus_addr_t addr, int scode)
{

       if (sti_dio_probe(bst, scode) == 0) {
               /* not found */
               return 1;
       }
       conscode = scode;

       return 0;
}

void
sti_dio_cnattach(bus_space_tag_t bst, int scode)
{
       paddr_t base;

       base = (paddr_t)dio_scodetopa(scode + STI_DIO_SCODE_OFFSET);
       sti_machdep_cnattach(bst, base);
}