usr/src/sys/sparc/sbus/cgthree.c

/*
 * Copyright (c) 1992 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 Laboratories.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)cgthree.c   7.2 (Berkeley) %G%
 *
 * from: $Header: cgthree.c,v 1.5 92/06/17 06:59:31 torek Exp $
 */

/*
 * color display (cgthree) driver.
 *
 * Does not handle interrupts, even though they can occur.
 */

#include "cgthree.h"

#include "sys/param.h"
#include "sys/buf.h"
#include "sys/device.h"
#include "sys/fbio.h"
#include "sys/ioctl.h"
#include "sys/malloc.h"
#include "sys/mman.h"
#include "sys/tty.h"

#include "machine/autoconf.h"
#include "machine/pmap.h"
#include "machine/fbvar.h"

#include "cgthreereg.h"
#include "sbusvar.h"

union colormap {
        u_char  cm_map[256][3];         /* 256 R/G/B entries */
        u_int   cm_chip[256 * 3 / 4];   /* the way the chip gets loaded */
};

/* per-display variables */
struct cgthree_softc {
        struct  device sc_dev;          /* base device */
        struct  sbusdev sc_sd;          /* sbus device */
        struct  fbdevice sc_fb;         /* frame buffer device */
        volatile struct cgthreereg *sc_reg;/* control registers */
        caddr_t sc_phys;                /* display RAM (phys addr) */
        int     sc_blanked;             /* true if blanked */
        union   colormap sc_cmap;       /* current color map */
};

/* autoconfiguration driver */
static void     cgthreeattach(struct device *, struct device *, void *);
struct cfdriver cgthreecd =
    { NULL, "cgthree", matchbyname, cgthreeattach,
      DV_DULL, sizeof(struct cgthree_softc) };

/*
 * XXX we do not handle frame buffer interrupts (do not know how) ... we
 * need these to do color map loading at vertical retrace time!
 */

/* frame buffer generic driver */
static void     cgthreeunblank(struct device *);
static struct fbdriver cgthreefbdriver = { cgthreeunblank };

extern int fbnode;
extern struct tty *fbconstty;
extern int (*v_putc)();
extern int nullop();
static int cgthree_cnputc();
#ifdef notdef
static struct cgthree_softc *bwcons;
#endif

#define CGTHREE_MAJOR   55              /* XXX */

/*
 * Attach a display.  We need to notice if it is the console, too.
 */
void
cgthreeattach(parent, self, args)
        struct device *parent, *self;
        void *args;
{
        register struct cgthree_softc *sc = (struct cgthree_softc *)self;
        register struct sbus_attach_args *sa = args;
        register int node = sa->sa_ra.ra_node, ramsize, i;
        register volatile struct cgthreereg *cg3;
        register struct cgthree_all *p;
        int isconsole;

        sc->sc_fb.fb_major = CGTHREE_MAJOR;     /* XXX to be removed */

        sc->sc_fb.fb_driver = &cgthreefbdriver;
        sc->sc_fb.fb_device = &sc->sc_dev;
        /*
         * The defaults below match my screen, but are not guaranteed
         * to be correct as defaults go...
         */
        sc->sc_fb.fb_type.fb_type = FBTYPE_SUN3COLOR;
        sc->sc_fb.fb_type.fb_width = getpropint(node, "width", 1152);
        sc->sc_fb.fb_type.fb_height = getpropint(node, "height", 900);
        sc->sc_fb.fb_linebytes = getpropint(node, "linebytes", 1152);
        ramsize = sc->sc_fb.fb_type.fb_height * sc->sc_fb.fb_linebytes;
        sc->sc_fb.fb_type.fb_depth = 8;
        sc->sc_fb.fb_type.fb_cmsize = 256;
        sc->sc_fb.fb_type.fb_size = ramsize;
        printf(": %s, %d x %d", getpropstring(node, "model"),
            sc->sc_fb.fb_type.fb_width, sc->sc_fb.fb_type.fb_height);

        /*
         * When the ROM has mapped in a cgthree 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.
         */
        isconsole = node == fbnode && fbconstty != NULL;
        p = (struct cgthree_all *)sa->sa_ra.ra_paddr;
        if ((sc->sc_fb.fb_pixels = sa->sa_ra.ra_vaddr) == NULL && isconsole) {
                /* this probably cannot happen, but what the heck */
                sc->sc_fb.fb_pixels = mapiodev(p->ba_ram, ramsize);
        }
        sc->sc_reg = cg3 = (volatile struct cgthreereg *)
            mapiodev((caddr_t)&p->ba_reg, sizeof(p->ba_reg));
        sc->sc_phys = p->ba_ram;

        /* grab initial (current) color map, then set video */
        cg3->cg3_addr = 0;
        for (i = 0; i < 256 * 3 / 4; i++)
                sc->sc_cmap.cm_chip[i] = cg3->cg3_cmap;
        cgthreeunblank(&sc->sc_dev);

        if (isconsole) {
                printf(" (console)\n");
#ifdef RCONSOLE
                rcons_init(&sc->sc_fb);
#endif
        } else
                printf("\n");
        sbus_establish(&sc->sc_sd, &sc->sc_dev);
        if (node == fbnode)
                fb_attach(&sc->sc_fb);
}

int
cgthreeopen(dev, flags, mode, p)
        dev_t dev;
        int flags, mode;
        struct proc *p;
{
        int unit = minor(dev);

        if (unit >= cgthreecd.cd_ndevs || cgthreecd.cd_devs[unit] == NULL)
                return (ENXIO);
        return (0);
}

int
cgthreeclose(dev, flags, mode, p)
        dev_t dev;
        int flags, mode;
        struct proc *p;
{

        return (0);
}

int
cgthreeioctl(dev, cmd, data, flags, p)
        dev_t dev;
        int cmd;
        caddr_t data;
        int flags;
        struct proc *p;
{
        register struct cgthree_softc *sc = cgthreecd.cd_devs[minor(dev)];
        register struct fbgattr *fba;

        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: {
                register struct fbcmap *p = (struct fbcmap *)data;
                register int i, color, count, error;
                register u_char *cp;

                /* get color map from software copy */
                if ((unsigned)(color = p->index) >= 256 ||
                    (unsigned)(count = p->count) > 256 - color)
                        return (EINVAL);
                if (!useracc(p->red, count, B_WRITE) ||
                    !useracc(p->green, count, B_WRITE) ||
                    !useracc(p->blue, count, B_WRITE))
                        return (EFAULT);
                cp = &sc->sc_cmap.cm_map[color][0];
                for (i = 0; i < count; cp += 3, i++) {
                        p->red[i] = cp[0];
                        p->green[i] = cp[1];
                        p->blue[i] = cp[2];
                }
        }
                break;

        case FBIOPUTCMAP: {
                register struct fbcmap *p = (struct fbcmap *)data;
                register int i, color, count, error;
                register u_char *cp;
                register u_int *ip;

                /* update software copy */
                if ((unsigned)(color = p->index) >= 256 ||
                    (unsigned)(count = p->count) > 256 - color)
                        return (EINVAL);
                if (!useracc(p->red, count, B_READ) ||
                    !useracc(p->green, count, B_READ) ||
                    !useracc(p->blue, count, B_READ))
                        return (EFAULT);
                cp = &sc->sc_cmap.cm_map[color][0];
                for (i = 0; i < count; cp += 3, i++) {
                        cp[0] = p->red[i];
                        cp[1] = p->green[i];
                        cp[2] = p->blue[i];
                }
                /* then blast them into the chip */
                /* XXX should use retrace interrupt */
#define D4M3(x) ((((x) >> 2) << 1) + ((x) >> 2))        /* (x / 4) * 3 */
#define D4M4(x) ((x) & ~3)                              /* (x / 4) * 4 */
                ip = &sc->sc_cmap.cm_chip[D4M3(color)];
                count = D4M3(color + count - 1) - D4M3(color) + 3;
                sc->sc_reg->cg3_addr = D4M4(color);
                while (--count >= 0)
                        sc->sc_reg->cg3_cmap = *ip++;
        }
                break;

        case FBIOGVIDEO:
                *(int *)data = sc->sc_blanked;
                break;

        case FBIOSVIDEO:
                if (*(int *)data)
                        cgthreeunblank(&sc->sc_dev);
                else {
                        register volatile struct cgthreereg *cg3 = sc->sc_reg;

                        sc->sc_blanked = 1;
                        cg3->cg3_addr = 0x06;   /* command reg */
                        cg3->cg3_ctrl = 0x70;   /* overlay plane */
                        cg3->cg3_addr = 0x04;   /* read mask */
                        cg3->cg3_ctrl = 0x00;   /* color planes */
                        /* set color 0 to black; scribble on R of color 1 */
                        cg3->cg3_addr = 0;
                        cg3->cg3_cmap = 0;
                }
                break;

        default:
                return (ENOTTY);
        }
        return (0);
}

static void
cgthreeunblank(dev)
        struct device *dev;
{
        struct cgthree_softc *sc = (struct cgthree_softc *)dev;
        register volatile struct cgthreereg *cg3 = sc->sc_reg;

        sc->sc_blanked = 0;
        cg3->cg3_addr = 0x06;   /* command reg */
        cg3->cg3_ctrl = 0x73;   /* overlay plane */
        cg3->cg3_addr = 0x04;   /* read mask */
        cg3->cg3_ctrl = 0xff;   /* color planes */
        /* restore color 0 and R of color 1 */
        cg3->cg3_addr = 0;
        cg3->cg3_cmap = sc->sc_cmap.cm_chip[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 cg3 is mapped starting at 256KB, for pseudo-compatibility with
 * the cg4 (which had an overlay plane in the first 128K and an enable
 * plane in the next 128K).  X11 uses only 256k+ region but tries to
 * map the whole thing, so we repeatedly map the first 256K to the
 * first page of the color screen.  If someone tries to use the overlay
 * and enable regions, they will get a surprise....
 */
int
cgthreemap(dev, off, prot)
        dev_t dev;
        int off, prot;
{
        register struct cgthree_softc *sc = cgthreecd.cd_devs[minor(dev)];
#define START   (128*1024 + 128*1024)

        if (off & PGOFSET)
                panic("cgthreemap");
        if ((unsigned)off < START)
                off = 0;
        else
                off -= START;
        if ((unsigned)off >= sc->sc_fb.fb_type.fb_size)
                return (-1);
        /*
         * I turned on PMAP_NC here to disable the cache as I was
         * getting horribly broken behaviour with it on.
         */
        return ((int)sc->sc_phys + off + PMAP_OBIO + PMAP_NC);
}