/*      $NetBSD: cgeight.c,v 1.51 2023/12/20 05:33:18 thorpej Exp $     */

/*-
* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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) 1992, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Lawrence Berkeley Laboratory.
*
* 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. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
*      from @(#)cgthree.c      8.2 (Berkeley) 10/30/93
*/

/*
* Copyright (c) 1995 Theo de Raadt.  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.
*/

/*
* color display (cgeight) driver.
*
* Does not handle interrupts, even though they can occur.
*
* XXX should defer colormap updates to vertical retrace interrupts
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cgeight.c,v 1.51 2023/12/20 05:33:18 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/tty.h>
#include <sys/conf.h>

#include <uvm/uvm_extern.h>

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

#include <dev/sun/fbio.h>
#include <dev/sun/fbvar.h>
#include <dev/sun/btreg.h>
#include <dev/sun/btvar.h>
#include <dev/sun/pfourreg.h>

/* per-display variables */
struct cgeight_softc {
       struct fbdevice sc_fb;          /* frame buffer device */
       bus_space_tag_t sc_bustag;
       bus_addr_t      sc_paddr;       /* phys address for device mmap() */

       volatile struct fbcontrol *sc_fbc;      /* Brooktree registers */
       union bt_cmap   sc_cmap;        /* Brooktree color map */
};

/* autoconfiguration driver */
static void     cgeightattach(device_t, device_t, void *);
static int      cgeightmatch(device_t, cfdata_t, void *);
#if defined(SUN4)
static void     cgeightunblank(device_t);
#endif

static int      cg8_pfour_probe(void *, void *);

CFATTACH_DECL_NEW(cgeight, sizeof(struct cgeight_softc),
   cgeightmatch, cgeightattach, NULL, NULL);

extern struct cfdriver cgeight_cd;

dev_type_open(cgeightopen);
dev_type_ioctl(cgeightioctl);
dev_type_mmap(cgeightmmap);

const struct cdevsw cgeight_cdevsw = {
       .d_open = cgeightopen,
       .d_close = nullclose,
       .d_read = noread,
       .d_write = nowrite,
       .d_ioctl = cgeightioctl,
       .d_stop = nostop,
       .d_tty = notty,
       .d_poll = nopoll,
       .d_mmap = cgeightmmap,
       .d_kqfilter = nokqfilter,
       .d_discard = nodiscard,
       .d_flag = 0
};

#if defined(SUN4)
/* frame buffer generic driver */
static struct fbdriver cgeightfbdriver = {
       cgeightunblank, cgeightopen, nullclose, cgeightioctl,
       nopoll, cgeightmmap, nokqfilter
};

static void cgeightloadcmap(struct cgeight_softc *, int, int);
static int cgeight_get_video(struct cgeight_softc *);
static void cgeight_set_video(struct cgeight_softc *, int);
#endif

/*
* Match a cgeight.
*/
static int
cgeightmatch(device_t parent, cfdata_t cf, void *aux)
{
       union obio_attach_args *uoba = aux;
       struct obio4_attach_args *oba;

       if (uoba->uoba_isobio4 == 0)
               return (0);

       oba = &uoba->uoba_oba4;
       return (bus_space_probe(oba->oba_bustag, oba->oba_paddr,
                               4,      /* probe size */
                               0,      /* offset */
                               0,      /* flags */
                               cg8_pfour_probe, NULL));
}

static int
cg8_pfour_probe(void *vaddr, void *arg)
{

       return (fb_pfour_id(vaddr) == PFOUR_ID_COLOR24);
}

/*
* Attach a display.  We need to notice if it is the console, too.
*/
static void
cgeightattach(device_t parent, device_t self, void *aux)
{
#if defined(SUN4)
       union obio_attach_args *uoba = aux;
       struct obio4_attach_args *oba = &uoba->uoba_oba4;
       struct cgeight_softc *sc = device_private(self);
       struct fbdevice *fb = &sc->sc_fb;
       bus_space_handle_t bh;
       volatile struct bt_regs *bt;
       int ramsize, i, isconsole;

       sc->sc_bustag = oba->oba_bustag;
       sc->sc_paddr = (bus_addr_t)oba->oba_paddr;

       /* Map the pfour register. */
       if (bus_space_map(oba->oba_bustag, oba->oba_paddr,
                         sizeof(uint32_t),
                         BUS_SPACE_MAP_LINEAR,
                         &bh) != 0) {
               printf("%s: cannot map pfour register\n",
                       device_xname(self));
               return;
       }
       fb->fb_pfour = (volatile uint32_t *)bh;

       fb->fb_driver = &cgeightfbdriver;
       fb->fb_device = self;
       fb->fb_type.fb_type = FBTYPE_MEMCOLOR;
       fb->fb_flags = device_cfdata(self)->cf_flags & FB_USERMASK;
       fb->fb_flags |= FB_PFOUR;

       ramsize = PFOUR_COLOR_OFF_END - PFOUR_COLOR_OFF_OVERLAY;

       fb->fb_type.fb_depth = 24;
       fb_setsize_eeprom(fb, fb->fb_type.fb_depth, 1152, 900);

       sc->sc_fb.fb_type.fb_cmsize = 256;
       sc->sc_fb.fb_type.fb_size = ramsize;
       printf(": cgeight/p4, %d x %d",
               fb->fb_type.fb_width,
               fb->fb_type.fb_height);

       isconsole = 0;

       if (CPU_ISSUN4) {
               struct eeprom *eep = (struct eeprom *)eeprom_va;

               /*
                * Assume this is the console if there's no eeprom info
                * to be found.
                */
               if (eep == NULL || eep->eeConsole == EE_CONS_P4OPT)
                       isconsole = fb_is_console(0);
       }

#if 0
       /*
        * We don't do any of the console handling here.  Instead,
        * we let the bwtwo driver pick up the overlay plane and
        * use it instead.  Rconsole should have better performance
        * with the 1-bit depth.
        *      -- Jason R. Thorpe <[email protected]>
        */

       /*
        * When the ROM has mapped in a cgfour display, the address
        * maps only the video RAM, so in any case we have to map the
        * registers ourselves.  We only need the video RAM if we are
        * going to print characters via rconsole.
        */

       if (isconsole) {
               /* XXX this is kind of a waste */
               fb->fb_pixels = mapiodev(ca->ca_ra.ra_reg,
                                        PFOUR_COLOR_OFF_OVERLAY, ramsize);
       }
#endif

       /* Map the Brooktree. */
       if (bus_space_map(oba->oba_bustag,
                         oba->oba_paddr + PFOUR_COLOR_OFF_CMAP,
                         sizeof(struct fbcontrol),
                         BUS_SPACE_MAP_LINEAR,
                         &bh) != 0) {
               printf("%s: cannot map control registers\n",
                       device_xname(self));
               return;
       }
       sc->sc_fbc = (volatile struct fbcontrol *)bh;

#if 0   /* XXX thorpej ??? */
       /* tell the enable plane to look at the mono image */
       memset(ca->ca_ra.ra_vaddr, 0xff,
           sc->sc_fb.fb_type.fb_width * sc->sc_fb.fb_type.fb_height / 8);
#endif

       /* grab initial (current) color map */
       bt = &sc->sc_fbc->fbc_dac;
       bt->bt_addr = 0;
       for (i = 0; i < 256 * 3 / 4; i++)
               sc->sc_cmap.cm_chip[i] = bt->bt_cmap;

       BT_INIT(bt, 0);

#if 0   /* see above */
       if (isconsole) {
               printf(" (console)\n");
#if defined(RASTERCONSOLE) && 0 /* XXX been told it doesn't work well. */
               fbrcons_init(fb);
#endif
       } else
#endif /* 0 */
               printf("\n");

       /*
        * Even though we're not using rconsole, we'd still like
        * to notice if we're the console framebuffer.
        */
       fb_attach(&sc->sc_fb, isconsole);
#endif
}

int
cgeightopen(dev_t dev, int flags, int mode, struct lwp *l)
{
       int unit = minor(dev);

       if (device_lookup(&cgeight_cd, unit) == NULL)
               return (ENXIO);
       return (0);
}

int
cgeightioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
{
#if defined(SUN4)
       struct cgeight_softc *sc = device_lookup_private(&cgeight_cd,
                                                        minor(dev));
       struct fbgattr *fba;
       int error;

       switch (cmd) {

       case FBIOGTYPE:
               *(struct fbtype *)data = sc->sc_fb.fb_type;
               break;

       case FBIOGATTR:
               fba = (struct fbgattr *)data;
               fba->real_type = sc->sc_fb.fb_type.fb_type;
               fba->owner = 0;         /* XXX ??? */
               fba->fbtype = sc->sc_fb.fb_type;
               fba->sattr.flags = 0;
               fba->sattr.emu_type = sc->sc_fb.fb_type.fb_type;
               fba->sattr.dev_specific[0] = -1;
               fba->emu_types[0] = sc->sc_fb.fb_type.fb_type;
               fba->emu_types[1] = -1;
               break;

       case FBIOGETCMAP:
#define p ((struct fbcmap *)data)
               return (bt_getcmap(p, &sc->sc_cmap, 256, 1));

       case FBIOPUTCMAP:
               /* copy to software map */
               error = bt_putcmap(p, &sc->sc_cmap, 256, 1);
               if (error)
                       return (error);
               /* now blast them into the chip */
               /* XXX should use retrace interrupt */
               cgeightloadcmap(sc, p->index, p->count);
#undef p
               break;

       case FBIOGVIDEO:
               *(int *)data = cgeight_get_video(sc);
               break;

       case FBIOSVIDEO:
               cgeight_set_video(sc, *(int *)data);
               break;

       default:
               return (ENOTTY);
       }
#endif /* SUN4 */

       return (0);
}

/*
* Return the address that would map the given device at the given
* offset, allowing for the given protection, or return -1 for error.
*
* The cg8 maps its overlay plane at 0 for 128K, followed by the
* enable plane for 128K, followed by the colour for as long as it
* goes. Starting at 8MB, it maps the ramdac for PAGE_SIZE, then the p4
* register for PAGE_SIZE, then the bootrom for 0x40000.
*/
paddr_t
cgeightmmap(dev_t dev, off_t off, int prot)
{
       struct cgeight_softc *sc = device_lookup_private(&cgeight_cd,
                                                        minor(dev));
       off_t poff;

#define START_ENABLE    (128*1024)
#define START_COLOR     ((128*1024) + (128*1024))
#define COLOR_SIZE      (sc->sc_fb.fb_type.fb_width * \
                           sc->sc_fb.fb_type.fb_height * 3)
#define END_COLOR       (START_COLOR + COLOR_SIZE)
#define START_SPECIAL   0x800000
#define PROMSIZE        0x40000
#define NOOVERLAY       (0x04000000)

       if (off & PGOFSET)
               panic("cgeightmap");

       if (off < 0)
               return (-1);
       else if ((u_int)off >= NOOVERLAY) {
               off -= NOOVERLAY;

               /*
                * X11 maps a huge chunk of the frame buffer; far more than
                * there really is. We compensate by double-mapping the
                * first page for as many other pages as it wants
                */
               while ((u_int)off >= COLOR_SIZE)
                       off -= COLOR_SIZE;      /* XXX thorpej ??? */

               poff = off + PFOUR_COLOR_OFF_COLOR;
       } else if ((u_int)off < START_ENABLE) {
               /*
                * in overlay plane
                */
               poff = PFOUR_COLOR_OFF_OVERLAY + off;
       } else if ((u_int)off < START_COLOR) {
               /*
                * in enable plane
                */
               poff = (off - START_ENABLE) + PFOUR_COLOR_OFF_ENABLE;
       } else if ((u_int)off < sc->sc_fb.fb_type.fb_size) {
               /*
                * in colour plane
                */
               poff = (off - START_COLOR) + PFOUR_COLOR_OFF_COLOR;
       } else if ((u_int)off < START_SPECIAL) {
               /*
                * hole
                */
               poff = 0;       /* XXX */
       } else if ((u_int)off == START_SPECIAL) {
               /*
                * colour map (Brooktree)
                */
               poff = PFOUR_COLOR_OFF_CMAP;
       } else if ((u_int)off == START_SPECIAL + PAGE_SIZE) {
               /*
                * p4 register
                */
               poff = 0;
       } else if ((u_int)off > (START_SPECIAL + (PAGE_SIZE * 2)) &&
           (u_int) off < (START_SPECIAL + (PAGE_SIZE * 2) + PROMSIZE)) {
               /*
                * rom
                */
               poff = 0x8000 + (off - (START_SPECIAL + (PAGE_SIZE * 2)));
       } else
               return (-1);

       return (bus_space_mmap(sc->sc_bustag,
               sc->sc_paddr, poff,
               prot, BUS_SPACE_MAP_LINEAR));
}

#if defined(SUN4)
/*
* Undo the effect of an FBIOSVIDEO that turns the video off.
*/
static void
cgeightunblank(device_t dev)
{

       cgeight_set_video(device_private(dev), 1);
}

static int
cgeight_get_video(struct cgeight_softc *sc)
{

       return (fb_pfour_get_video(&sc->sc_fb));
}

static void
cgeight_set_video(struct cgeight_softc *sc, int enable)
{

       fb_pfour_set_video(&sc->sc_fb, enable);
}

/*
* Load a subset of the current (new) colormap into the Brooktree DAC.
*/
static void
cgeightloadcmap(struct cgeight_softc *sc, int start, int ncolors)
{
       volatile struct bt_regs *bt;
       u_int *ip;
       int count;

       ip = &sc->sc_cmap.cm_chip[BT_D4M3(start)];      /* start/4 * 3 */
       count = BT_D4M3(start + ncolors - 1) - BT_D4M3(start) + 3;
       bt = &sc->sc_fbc->fbc_dac;
       bt->bt_addr = BT_D4M4(start);
       while (--count >= 0)
               bt->bt_cmap = *ip++;
}
#endif /* SUN4 */

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