/*      $NetBSD: fb.c,v 1.37 2019/11/10 21:16:37 chs Exp $ */

/*
 * 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.
 *
 *      @(#)fb.c        8.1 (Berkeley) 6/11/93
 */

/*
 * /dev/fb (indirect frame buffer driver).  This is gross; we should
 * just build cdevsw[] dynamically.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fb.c,v 1.37 2019/11/10 21:16:37 chs Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/malloc.h>
#include <sys/types.h>

#include <machine/promlib.h>
#include <machine/autoconf.h>
#include <machine/kbd.h>
#include <machine/eeprom.h>
#include <sparc/dev/cons.h>

#include <dev/sun/fbio.h>
#include <dev/sun/fbvar.h>

#include "kbd.h"
#include "pfour.h"


struct fbdevlist {
        struct fbdevice *fb_dev;
        struct fbdevlist *fb_next;
};

static struct fbdevlist fblist = {
    NULL,
    NULL,
};

dev_type_open(fbopen);
dev_type_close(fbclose);
dev_type_ioctl(fbioctl);
dev_type_poll(fbpoll);
dev_type_mmap(fbmmap);
dev_type_kqfilter(fbkqfilter);

const struct cdevsw fb_cdevsw = {
        .d_open = fbopen,
        .d_close = fbclose,
        .d_read = noread,
        .d_write = nowrite,
        .d_ioctl = fbioctl,
        .d_stop = nostop,
        .d_tty = notty,
        .d_poll = fbpoll,
        .d_mmap = fbmmap,
        .d_kqfilter = fbkqfilter,
        .d_discard = nodiscard,
        .d_flag = D_OTHER
};

void
fb_unblank(void)
{

        struct fbdevlist *fbl = &fblist;

        while (fbl != NULL && fbl->fb_dev != NULL) {
                (*fbl->fb_dev->fb_driver->fbd_unblank)(fbl->fb_dev->fb_device);
                fbl = fbl->fb_next;
        }
}

/*
 * Helper function for frame buffer devices. Decides whether
 * the device can be the console output device according to
 * PROM info. The result from this function may not be conclusive
 * on machines with old PROMs; in that case, drivers should consult
 * other sources of configuration information (e.g. EEPROM entries).
 */
int
fb_is_console(int node)
{
#if !defined(SUN4U)
        int fbnode;

        switch (prom_version()) {
        case PROM_OLDMON:
                /* `node' is not valid; just check for any fb device */
                return (prom_stdout() == PROMDEV_SCREEN);

        case PROM_OBP_V0:
                /*
                 * First, check if prom_stdout() represents a frame buffer,
                 * then match on the `fb' property on the root node, if any.
                 */
                if (prom_stdout() != PROMDEV_SCREEN)
                        return (0);

                fbnode = prom_getpropint(findroot(), "fb", 0);
                return (fbnode == 0 || node == fbnode);

        case PROM_OBP_V2:
        case PROM_OBP_V3:
        case PROM_OPENFIRM:
                /* Just match the nodes */
                return (node == prom_stdout_node);
        }

        return (0);
#else
                return (node == prom_stdout_node);
#endif
}

void
fb_attach(struct fbdevice *fb, int isconsole)
{
        static int seen_force = 0;
        int nfb = 0;
        struct fbdevlist *fbl = &fblist;

        /*
         * Check to see if we're being forced into /dev/fb0, or if we're
         * the console.  If we are, then move/replace the current fb0.
         */
        if ((fb->fb_flags & FB_FORCE || (isconsole && !seen_force)) &&
            fblist.fb_dev != NULL) {
                while (fbl->fb_next != NULL) {
                        fbl = fbl->fb_next;
                        nfb++;
                }
                fbl->fb_next = malloc(sizeof (struct fbdevlist),
                    M_DEVBUF, M_WAITOK);
                fbl = fbl->fb_next;
                nfb++;
                fbl->fb_dev = fblist.fb_dev;
                fbl->fb_next = NULL;
                aprint_normal_dev(fbl->fb_dev->fb_device,
                    "moved to /dev/fb%d\n", nfb);
                aprint_normal_dev(fbl->fb_dev->fb_device,
                    "attached to /dev/fb0\n");
                fblist.fb_dev = fb;
                if (fb->fb_flags & FB_FORCE)
                        seen_force = 1;
        /* Add to end of fb list. */
        } else {
                if (fblist.fb_dev != NULL) {
                        while (fbl->fb_next != NULL) {
                                fbl = fbl->fb_next;
                                nfb++;
                        }
                        fbl->fb_next = malloc(sizeof (struct fbdevlist),
                            M_DEVBUF, M_WAITOK);
                        fbl = fbl->fb_next;
                        nfb++;
                }
                fbl->fb_dev = fb;
                fbl->fb_next = NULL;
                aprint_normal_dev(fbl->fb_dev->fb_device,
                     "attached to /dev/fb%d\n", nfb);
        }
}

int
fbopen(dev_t dev, int flags, int mode, struct lwp *l)
{
        int unit, nunit;
        struct fbdevlist *fbl = &fblist;

        unit = minor(dev);
        while (unit-- && fbl != NULL)
                fbl = fbl->fb_next;
        if (fbl == NULL || fbl->fb_dev == NULL)
                return (ENXIO);
                
        nunit = device_unit(fbl->fb_dev->fb_device);
        return (fbl->fb_dev->fb_driver->fbd_open)(makedev(0, nunit), flags,
            mode, l);
}

int
fbclose(dev_t dev, int flags, int mode, struct lwp *l)
{
        int unit, nunit;
        struct fbdevlist *fbl = &fblist;

        unit = minor(dev);
        while (unit-- && fbl != NULL)
                fbl = fbl->fb_next;
        if (fbl == NULL || fbl->fb_dev == NULL)
                return (ENXIO);

        nunit = device_unit(fbl->fb_dev->fb_device);
        return (fbl->fb_dev->fb_driver->fbd_close)(makedev(0, nunit), flags,
            mode, l);
}

int
fbioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
{
        int unit, nunit;
        struct fbdevlist *fbl = &fblist;

        unit = minor(dev);
        while (unit-- && fbl != NULL)
                fbl = fbl->fb_next;
        if (fbl == NULL || fbl->fb_dev == NULL)
                return (ENXIO);

        nunit = device_unit(fbl->fb_dev->fb_device);
        return (fbl->fb_dev->fb_driver->fbd_ioctl)(makedev(0, nunit), cmd, 
            data, flags, l);
}

int
fbpoll(dev_t dev, int events, struct lwp *l)
{
        int unit, nunit;
        struct fbdevlist *fbl = &fblist;

        unit = minor(dev);
        while (unit-- && fbl != NULL)
                fbl = fbl->fb_next;
        if (fbl == NULL || fbl->fb_dev == NULL)
                return (ENXIO);

        nunit = device_unit(fbl->fb_dev->fb_device);
        return (fbl->fb_dev->fb_driver->fbd_poll)(makedev(0, nunit), events,
            l);
}

int
fbkqfilter(dev_t dev, struct knote *kn)
{
        int unit, nunit;
        struct fbdevlist *fbl = &fblist;

        unit = minor(dev);
        while (unit-- && fbl != NULL)
                fbl = fbl->fb_next;
        if (fbl == NULL || fbl->fb_dev == NULL)
                return (ENXIO);

        nunit = device_unit(fbl->fb_dev->fb_device);
        return (fbl->fb_dev->fb_driver->fbd_kqfilter)(makedev(0, nunit), kn);
}

paddr_t
fbmmap(dev_t dev, off_t off, int prot)
{
        int unit, nunit;
        struct fbdevlist *fbl = &fblist;

        unit = minor(dev);
        while (unit-- && fbl != NULL)
                fbl = fbl->fb_next;
        if (fbl == NULL || fbl->fb_dev == NULL)
                return (ENXIO);

        nunit = device_unit(fbl->fb_dev->fb_device);
        paddr_t (*map)(dev_t, off_t, int) = fbl->fb_dev->fb_driver->fbd_mmap;

        if (map == NULL)
                return (-1);
        return (map(makedev(0, nunit), off, prot));
}

void
fb_setsize_obp(struct fbdevice *fb, int depth, int def_width, int def_height, int node)
{
        fb->fb_type.fb_width = prom_getpropint(node, "width", def_width);
        fb->fb_type.fb_height = prom_getpropint(node, "height", def_height);
        fb->fb_linebytes = prom_getpropint(node, "linebytes",
                                     (fb->fb_type.fb_width * depth) / 8);
}

void
fb_setsize_eeprom(struct fbdevice *fb, int depth, int def_width, int def_height)
{
#if !defined(SUN4U)
        struct eeprom *eep = (struct eeprom *)eeprom_va;

        if (!CPU_ISSUN4) {
                printf("fb_setsize_eeprom: not sun4\n");
                return;
        }

        /* Set up some defaults. */
        fb->fb_type.fb_width = def_width;
        fb->fb_type.fb_height = def_height;

        if (fb->fb_flags & FB_PFOUR) {
#if NPFOUR > 0
                fb_setsize_pfour(fb);
#endif
        } else if (eep != NULL) {
                switch (eep->eeScreenSize) {
                case EE_SCR_1152X900:
                        fb->fb_type.fb_width = 1152;
                        fb->fb_type.fb_height = 900;
                        break;

                case EE_SCR_1024X1024:
                        fb->fb_type.fb_width = 1024;
                        fb->fb_type.fb_height = 1024;
                        break;

                case EE_SCR_1600X1280:
                        fb->fb_type.fb_width = 1600;
                        fb->fb_type.fb_height = 1280;
                        break;

                case EE_SCR_1440X1440:
                        fb->fb_type.fb_width = 1440;
                        fb->fb_type.fb_height = 1440;
                        break;

                default:
                        /*
                         * XXX: Do nothing, I guess.
                         * Should we print a warning about
                         * an unknown value? --thorpej
                         */
                        break;
                }
        }

        fb->fb_linebytes = (fb->fb_type.fb_width * depth) / 8;
#endif /* !SUN4U */
}