/*      $NetBSD: grf_obio.c,v 1.59 2019/07/26 10:48:44 rin Exp $        */

/*
* Copyright (C) 1998 Scott Reynolds
* 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.
*/
/*
* Copyright (c) 1995 Allen Briggs.  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. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by Allen Briggs.
* 4. 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.
*/
/*
* Graphics display driver for the Macintosh internal video for machines
* that don't map it into a fake nubus card.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: grf_obio.c,v 1.59 2019/07/26 10:48:44 rin Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/kmem.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <sys/proc.h>
#include <sys/systm.h>

#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/grfioctl.h>
#include <machine/viareg.h>
#include <machine/video.h>

#include <mac68k/nubus/nubus.h>
#include <mac68k/obio/grf_obioreg.h>
#include <mac68k/obio/obiovar.h>
#include <mac68k/dev/grfvar.h>

static int      grfiv_mode(struct grf_softc *, int, void *);
static int      grfiv_match(device_t, cfdata_t, void *);
static void     grfiv_attach(device_t, device_t, void *);

static void     dafb_set_mapreg(void *, int, int, int, int);
static void     civic_set_mapreg(void *, int, int, int, int);
static void     valkyrie_set_mapreg(void *, int, int, int, int);
static void     rbv_set_mapreg(void *, int, int, int, int);

CFATTACH_DECL_NEW(intvid, sizeof(struct grfbus_softc),
   grfiv_match, grfiv_attach, NULL, NULL);

static int
grfiv_match(device_t parent, cfdata_t cf, void *aux)
{
       struct obio_attach_args *oa = (struct obio_attach_args *)aux;
       bus_space_handle_t bsh;
       int found;
       u_int base;

       found = 1;

       switch (current_mac_model->class) {
       case MACH_CLASSQ2:
               if (current_mac_model->machineid != MACH_MACLC575) {
                       base = VALKYRIE_CONTROL_BASE;

                       if (bus_space_map(oa->oa_tag, base, 0x40, 0, &bsh))
                               return 0;

                       /* Disable interrupts */
                       bus_space_write_1(oa->oa_tag, bsh, 0x18, 0x1);

                       bus_space_unmap(oa->oa_tag, bsh, 0x40);
                       break;
               }
               /*
                * Note:  the only system in this class that does not have
                * the Valkyrie chip -- at least, that we know of -- is
                * the Performa/LC 57x series.  This system has a version
                * of the DAFB controller, instead.
                *
                * If this assumption proves false, we'll have to be more
                * intelligent here.
                */
               /*FALLTHROUGH*/
       case MACH_CLASSQ:
               /*
                * Assume DAFB for all of these, unless we can't
                * access the memory.
                */
               base = DAFB_CONTROL_BASE;

               if (bus_space_map(oa->oa_tag, base, 0x20, 0, &bsh))
                       return 0;

               if (mac68k_bus_space_probe(oa->oa_tag, bsh, 0x1c, 4) == 0) {
                       bus_space_unmap(oa->oa_tag, bsh, 0x20);
                       return 0;
               }

               bus_space_unmap(oa->oa_tag, bsh, 0x20);

               if (bus_space_map(oa->oa_tag, base + 0x100, 0x20, 0, &bsh))
                       return 0;

               if (mac68k_bus_space_probe(oa->oa_tag, bsh, 0x04, 4) == 0) {
                       bus_space_unmap(oa->oa_tag, bsh, 0x20);
                       return 0;
               }

               /* Disable interrupts */
               bus_space_write_4(oa->oa_tag, bsh, 0x04, 0);

               /* Clear any interrupts */
               bus_space_write_4(oa->oa_tag, bsh, 0x0C, 0);
               bus_space_write_4(oa->oa_tag, bsh, 0x10, 0);
               bus_space_write_4(oa->oa_tag, bsh, 0x14, 0);

               bus_space_unmap(oa->oa_tag, bsh, 0x20);
               break;
       case MACH_CLASSAV:
               base = CIVIC_CONTROL_BASE;

               if (bus_space_map(oa->oa_tag, base, 0x1000, 0, &bsh))
                       return 0;

               /* Disable interrupts */
               bus_space_write_1(oa->oa_tag, bsh, 0x120, 0);

               bus_space_unmap(oa->oa_tag, bsh, 0x1000);
               break;
       case MACH_CLASSIIci:
       case MACH_CLASSIIsi:
               if (mac68k_video.mv_len == 0 ||
                   (via2_reg(rMonitor) & RBVMonitorMask) == RBVMonIDNone)
                       found = 0;
               break;
       default:
               if (mac68k_video.mv_len == 0)
                       found = 0;
               break;
       }

       return found;
}

static void
grfiv_attach(device_t parent, device_t self, void *aux)
{
       struct obio_attach_args *oa = (struct obio_attach_args *)aux;
       struct grfbus_softc *sc;
       struct grfmode *gm;
       u_long base, length;
       u_int32_t vbase1, vbase2;

       sc = device_private(self);
       sc->sc_dev = self;

       sc->card_id = 0;

       switch (current_mac_model->class) {
       case MACH_CLASSQ2:
               if (current_mac_model->machineid != MACH_MACLC575) {
                       sc->sc_basepa = VALKYRIE_FB_BASE;
                       length = 0x00100000;            /* 1MB */

                       if (sc->sc_basepa <= mac68k_video.mv_phys &&
                           mac68k_video.mv_phys < (sc->sc_basepa + length)) {
                               sc->sc_fbofs =
                                   mac68k_video.mv_phys - sc->sc_basepa;
                       } else {
                               sc->sc_basepa =
                                   m68k_trunc_page(mac68k_video.mv_phys);
                               sc->sc_fbofs =
                                   m68k_page_offset(mac68k_video.mv_phys);
                               length = mac68k_video.mv_len + sc->sc_fbofs;
                       }

                       if (bus_space_map(sc->sc_tag, VALKYRIE_CMAP_BASE,
                           VALKYRIE_CMAP_LEN, 0, &sc->sc_cmh) == 0)
                               sc->sc_set_mapreg = valkyrie_set_mapreg;

                       printf(" @ %lx: Valkyrie video subsystem\n",
                           sc->sc_basepa + sc->sc_fbofs);
                       break;
               }
               /* See note in grfiv_match() */
               /*FALLTHROUGH*/
       case MACH_CLASSQ:
               base = DAFB_CONTROL_BASE;
               sc->sc_tag = oa->oa_tag;
               if (bus_space_map(sc->sc_tag, base, 0x20, 0, &sc->sc_regh)) {
                       printf(": failed to map DAFB register space\n");
                       return;
               }

               sc->sc_basepa = DAFB_FB_BASE;
               length = 0x00100000;            /* 1MB */

               /* Compute the current frame buffer offset */
               vbase1 = bus_space_read_4(sc->sc_tag, sc->sc_regh, 0x0) & 0xfff;
#if 1
               /*
                * XXX The following exists because the DAFB v7 in these
                * systems doesn't return reasonable values to use for fbofs.
                * Ken'ichi Ishizaka gets credit for this hack.  (sar 19990426)
                * (Does this get us the correct result for _all_ DAFB-
                * equipped systems and monitor combinations?  It seems
                * possible, if not likely...)
                */
               switch (current_mac_model->machineid) {
               case MACH_MACLC475:
               case MACH_MACLC475_33:
               case MACH_MACLC575:
               case MACH_MACQ605:
               case MACH_MACQ605_33:
                       vbase1 &= 0x3f;
                       break;
               }
#endif
               vbase2 = bus_space_read_4(sc->sc_tag, sc->sc_regh, 0x4) & 0xf;
               sc->sc_fbofs = (vbase1 << 9) | (vbase2 << 5);

               if (bus_space_map(sc->sc_tag, DAFB_CMAP_BASE, DAFB_CMAP_LEN,
                   0, &sc->sc_cmh) == 0) {
                       uint8_t *buf = kmem_zalloc(256 * 3, KM_SLEEP);
                       sc->sc_cmap.red = buf;
                       sc->sc_cmap.green = buf + 256;
                       sc->sc_cmap.blue = buf + 256 * 2;
                       sc->sc_set_mapreg = dafb_set_mapreg;
               }

               printf(" @ %lx: DAFB video subsystem, monitor sense %x\n",
                   sc->sc_basepa + sc->sc_fbofs,
                   (bus_space_read_4(sc->sc_tag, sc->sc_regh, 0x1c) & 0x7));

               bus_space_unmap(sc->sc_tag, sc->sc_regh, 0x20);
               break;
       case MACH_CLASSAV:
               sc->sc_basepa = CIVIC_FB_BASE;
               length = 0x00200000;            /* 2MB */
               if (mac68k_video.mv_phys >= sc->sc_basepa &&
                   mac68k_video.mv_phys < (sc->sc_basepa + length)) {
                       sc->sc_fbofs = mac68k_video.mv_phys - sc->sc_basepa;
               } else {
                       sc->sc_basepa = m68k_trunc_page(mac68k_video.mv_phys);
                       sc->sc_fbofs = m68k_page_offset(mac68k_video.mv_phys);
                       length = mac68k_video.mv_len + sc->sc_fbofs;
               }

               if (bus_space_map(sc->sc_tag, CIVIC_CMAP_BASE, CIVIC_CMAP_LEN,
                   0, &sc->sc_cmh) == 0)
                       sc->sc_set_mapreg = civic_set_mapreg;

               printf(" @ %lx: CIVIC video subsystem\n",
                   sc->sc_basepa + sc->sc_fbofs);
               break;
       case MACH_CLASSIIci:
       case MACH_CLASSIIsi:
               sc->sc_basepa = m68k_trunc_page(mac68k_video.mv_phys);
               sc->sc_fbofs = m68k_page_offset(mac68k_video.mv_phys);
               length = mac68k_video.mv_len + sc->sc_fbofs;

               if (bus_space_map(sc->sc_tag, RBV_CMAP_BASE, RBV_CMAP_LEN,
                   0, &sc->sc_cmh) == 0)
                       sc->sc_set_mapreg = rbv_set_mapreg;

               printf(" @ %lx: RBV video subsystem, ",
                   sc->sc_basepa + sc->sc_fbofs);
               switch (via2_reg(rMonitor) & RBVMonitorMask) {
               case RBVMonIDBWP:
                       printf("15\" monochrome portrait");
                       break;
               case RBVMonIDRGB12:
                       printf("12\" color");
                       break;
               case RBVMonIDRGB15:
                       printf("15\" color");
                       break;
               case RBVMonIDStd:
                       printf("Macintosh II");
                       break;
               default:
                       printf("unrecognized");
                       break;
               }
               printf(" display\n");

               break;
       default:
               sc->sc_basepa = m68k_trunc_page(mac68k_video.mv_phys);
               sc->sc_fbofs = m68k_page_offset(mac68k_video.mv_phys);
               length = mac68k_video.mv_len + sc->sc_fbofs;

               /* XXX setpalette? */

               printf(" @ %lx: On-board video\n",
                   sc->sc_basepa + sc->sc_fbofs);
               break;
       }

       if (bus_space_map(sc->sc_tag, sc->sc_basepa, length, 0,
           &sc->sc_handle)) {
               printf("%s: failed to map video RAM\n", device_xname(sc->sc_dev));
               return;
       }

       if (sc->sc_basepa <= mac68k_video.mv_phys &&
           mac68k_video.mv_phys < (sc->sc_basepa + length)) {
               /* XXX Hack */
               mac68k_video.mv_kvaddr = sc->sc_handle.base + sc->sc_fbofs;
       }

       gm = &(sc->curr_mode);
       gm->mode_id = 0;
       gm->psize = mac68k_video.mv_depth;
       gm->ptype = 0;
       gm->width = mac68k_video.mv_width;
       gm->height = mac68k_video.mv_height;
       gm->rowbytes = mac68k_video.mv_stride;
       gm->hres = 80;                          /* XXX hack */
       gm->vres = 80;                          /* XXX hack */
       gm->fbsize = gm->height * gm->rowbytes;
       gm->fbbase = (void *)sc->sc_handle.base; /* XXX yet another hack */
       gm->fboff = sc->sc_fbofs;

       /* Perform common video attachment. */
       grf_establish(sc, NULL, grfiv_mode);
}

static int
grfiv_mode(struct grf_softc *sc, int cmd, void *arg)
{
       switch (cmd) {
       case GM_GRFON:
       case GM_GRFOFF:
               return 0;
       case GM_CURRMODE:
               break;
       case GM_NEWMODE:
               break;
       case GM_LISTMODES:
               break;
       }
       return EINVAL;
}

#define CHECK_INDEX(index)                                              \
       do {                                                            \
               size_t depth = mac68k_video.mv_depth;                   \
               if (depth == 1 || depth > 8 || (index) >= (1 << depth)) \
                       return;                                         \
       } while (0 /* CONSTCOND */)

static void
dafb_set_mapreg(void *cookie, int index, int r, int g, int b)
{
       struct grfbus_softc *sc = (struct grfbus_softc *)cookie;
       static int last = -2;

       CHECK_INDEX(index);

#define dafb_write_lut(val)     \
   bus_space_write_1(sc->sc_tag, sc->sc_cmh, DAFB_CMAP_LUT, val)

       if (index != last + 1) {
               bus_space_write_4(sc->sc_tag, sc->sc_cmh, DAFB_CMAP_RESET, 0);
               for (int i = 0; i < index; i++) {
                       dafb_write_lut(sc->sc_cmap.red[i]);
                       dafb_write_lut(sc->sc_cmap.green[i]);
                       dafb_write_lut(sc->sc_cmap.blue[i]);
               }
       }

       dafb_write_lut(r);
       dafb_write_lut(g);
       dafb_write_lut(b);

       last = index;
       sc->sc_cmap.red[index] = r;
       sc->sc_cmap.green[index] = g;
       sc->sc_cmap.blue[index] = b;

#undef  dafb_write_lut

}

static void
civic_set_mapreg(void *cookie, int index, int r, int g, int b)
{
       struct grfbus_softc *sc = (struct grfbus_softc *)cookie;
       uint8_t status, junk = 0;

       CHECK_INDEX(index);

#define civic_read_lut          \
   bus_space_read_1(sc->sc_tag, sc->sc_cmh, CIVIC_CMAP_LUT)
#define civic_write_lut(val)    \
   bus_space_write_1(sc->sc_tag, sc->sc_cmh, CIVIC_CMAP_LUT, val)

       bus_space_write_1(sc->sc_tag, sc->sc_cmh, CIVIC_CMAP_ADDR, index);
       status = bus_space_read_1(sc->sc_tag, sc->sc_cmh, CIVIC_CMAP_STATUS2);
       if (status & 0x08) {
               junk = civic_read_lut;
               junk = civic_read_lut;
               junk = civic_read_lut;
               junk = civic_read_lut;
               if (status & 0x0d) {
                       civic_write_lut(0);
                       civic_write_lut(0);
               }
       }
       civic_write_lut(r);
       civic_write_lut(g);
       civic_write_lut(b);
       civic_write_lut(junk);

#undef  civic_read_lut
#undef  civic_write_lut

}

static void
valkyrie_set_mapreg(void *cookie, int index, int r, int g, int b)
{
       struct grfbus_softc *sc = (struct grfbus_softc *)cookie;

       CHECK_INDEX(index);

#define valkyrie_write_lut(val) \
   bus_space_write_1(sc->sc_tag, sc->sc_cmh, VALKYRIE_CMAP_LUT, val)

       bus_space_write_1(sc->sc_tag, sc->sc_cmh, VALKYRIE_CMAP_ADDR, index);
       delay(1);
       valkyrie_write_lut(r);
       valkyrie_write_lut(g);
       valkyrie_write_lut(b);

#undef  valkyrie_write_lut

}

static void
rbv_set_mapreg(void *cookie, int index, int r, int g, int b)
{
       struct grfbus_softc *sc = (struct grfbus_softc *)cookie;

       CHECK_INDEX(index);

#define rbv_write_lut(val)      \
   bus_space_write_1(sc->sc_tag, sc->sc_cmh, RBV_CMAP_LUT, val)

       index += 256 - (1 << mac68k_video.mv_depth);
       bus_space_write_1(sc->sc_tag, sc->sc_cmh, RBV_CMAP_CNTL, 0xff);
       bus_space_write_1(sc->sc_tag, sc->sc_cmh, RBV_CMAP_ADDR, index);
       rbv_write_lut(r);
       rbv_write_lut(g);
       rbv_write_lut(b);

#undef  rbv_write_lut

}

#undef  CHECK_INDEX

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