/*      $NetBSD: bmd.c,v 1.10 2024/07/05 19:28:36 andvar Exp $  */

/*
 * Copyright (c) 1992 OMRON Corporation.
 *
 * This code is derived from software contributed to Berkeley by
 * OMRON Corporation.
 *
 * 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 the University of
 *      California, Berkeley and its contributors.
 * 4. 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.
 *
 *      @(#)bmd.c       8.2 (Berkeley) 8/15/93
 */
/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * OMRON Corporation.
 *
 * 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.
 *
 *      @(#)bmd.c       8.2 (Berkeley) 8/15/93
 */
/*

 * bmd.c --- Bitmap-Display raw-level driver routines
 *
 *      by A.Fujita, SEP-09-1992
 */


#include <sys/param.h>
#include <luna68k/stand/boot/samachdep.h>
#include <machine/board.h>

/*
 *  RFCNT register
 */

union bmd_rfcnt {
        struct {
                int16_t rfc_hcnt;
                int16_t rfc_vcnt;
        } p;
        uint32_t u;
};

#define isprint(c)      ((c) >= 0x20 && (c) < 0x7f)

/*
 *  Width & Height
 */

#define BMAP_OFFSET     8

#define PB_WIDTH        2048                    /* Plane Width   (Bit) */
#define PB_HEIGHT       1024                    /* Plane Height  (Bit) */
#define PL_WIDTH        64                      /* Plane Width  (long) */
#define PS_WIDTH        128                     /* Plane Width  (long) */
#define P_WIDTH         256                     /* Plane Width  (Byte) */

#define SB_WIDTH        1280                    /* Screen Width  (Bit) */
#define SB_HEIGHT       1024                    /* Screen Height (Bit) */
#define SL_WIDTH        40                      /* Screen Width (Long) */
#define S_WIDTH         160                     /* Screen Width (Byte) */

#define FB_WIDTH        12                      /* Font Width    (Bit) */
#define FB_HEIGHT       20                      /* Font Height   (Bit) */


#define NEXT_LINE(addr)                 (addr +  (PL_WIDTH * FB_HEIGHT))
#define SKIP_NEXT_LINE(addr)            (addr += (PL_WIDTH - SL_WIDTH))


static void     bmd_draw_char(uint8_t *, uint8_t *, int, int, int);
static void     bmd_reverse_char(uint8_t *, uint8_t *, int, int);
static void     bmd_erase_char(uint8_t *, uint8_t *, int, int);
static void     bmd_erase_screen(volatile uint32_t *);
static void     bmd_scroll_screen(volatile uint32_t *, volatile uint32_t *,
                    int, int, int, int);


struct bmd_linec {
        struct bmd_linec *bl_next;
        struct bmd_linec *bl_prev;
        int     bl_col;
        int     bl_end;
        uint8_t bl_line[128];
};

struct bmd_softc {
        int     bc_stat;
        uint8_t *bc_raddr;
        uint8_t *bc_waddr;
        int     bc_xmin;
        int     bc_xmax;
        int     bc_ymin;
        int     bc_ymax;
        int     bc_col;
        int     bc_row;
        struct bmd_linec *bc_bl;
        char    bc_escseq[8];
        char   *bc_esc;
        void  (*bc_escape)(int);
};

#define STAT_NORMAL     0x0000
#define STAT_ESCAPE     0x0001
#define STAT_INSERT     0x0100

static struct   bmd_softc bmd_softc;
static struct   bmd_linec bmd_linec[52];

static void     bmd_escape(int);
static void     bmd_escape_0(int);
#if 0
static void     bmd_escape_1(int);
#endif


/*
 * Escape-Sequence
 */

static void
bmd_escape(int c)
{
        struct bmd_softc *bp = &bmd_softc;

        switch (c) {

        case '[':
                bp->bc_escape = bmd_escape_0;
                break;

        default:
                bp->bc_stat &= ~STAT_ESCAPE;
                bp->bc_esc = &bp->bc_escseq[0];
                bp->bc_escape = bmd_escape;
                break;
        }
}

static void
bmd_escape_0(int c)
{
        struct bmd_softc *bp = &bmd_softc;
        struct bmd_linec *bq = bp->bc_bl;

        switch (c) {

        case 'A':
                if (bp->bc_row > bp->bc_ymin) {
                        bp->bc_row--;
                }
                break;

        case 'C':
                if (bq->bl_col < bp->bc_xmax - 1) {
                        bq->bl_col++;
                }
                break;

        case 'K':
                if (bq->bl_col < bp->bc_xmax) {
                        int col;
                        for (col = bq->bl_col; col < bp->bc_xmax; col++)
                                bmd_erase_char(bp->bc_raddr,
                                               bp->bc_waddr,
                                               col, bp->bc_row);
                }
                bq->bl_end = bq->bl_col;
                break;

        case 'H':
                bq->bl_col = bq->bl_end = bp->bc_xmin;
                bp->bc_row = bp->bc_ymin;
                break;

        default:
#if 0
                *bp->bc_esc++ = c;
                bp->bc_escape = bmd_escape_1;
                return;
#endif
                break;
        }

        bp->bc_stat &= ~STAT_ESCAPE;
        bp->bc_esc = &bp->bc_escseq[0];
        bp->bc_escape = bmd_escape;
}

#if 0
static void
bmd_escape_1(int c)
{
        struct bmd_softc *bp = &bmd_softc;
        struct bmd_linec *bq = bp->bc_bl;
        int col = 0, row = 0;
        char *p;

        switch (c) {

        case 'J':
                bp->bc_stat &= ~STAT_ESCAPE;
                bp->bc_esc = &bp->bc_escseq[0];
                bp->bc_escape = bmd_escape;
                break;

        case 'H':
                for (p = &bp->bc_escseq[0]; *p != ';'; p++)
                        row = (row * 10) + (*p - 0x30);
                p++;
                for (p = &bp->bc_escseq[0]; p != bp->bc_esc; p++)
                        col = (col * 10) + (*p - 0x30);

                bq->bl_col = col + bp->bc_xmin;
                bp->bc_row = row + bp->bc_ymin;

                bp->bc_stat &= ~STAT_ESCAPE;
                bp->bc_esc = &bp->bc_escseq[0];
                bp->bc_escape = bmd_escape;
                break;

        default:
                *bp->bc_esc++ = c;
                break;
        }
}
#endif

/*
 * Entry Routine
 */

void
bmdinit(void)
{
        volatile uint32_t *bmd_rfcnt = (uint32_t *)BMAP_RFCNT;
        volatile uint32_t *bmd_bmsel = (uint32_t *)BMAP_BMSEL;
        struct bmd_softc *bp = &bmd_softc;
        struct bmd_linec *bq;
        int i;
        union bmd_rfcnt rfcnt;

        /*
         *  adjust plane position
         */

        /* plane-0 hardware address */
        bp->bc_raddr = (uint8_t *)(BMAP_BMAP0 + BMAP_OFFSET);
        /* common bitmap hardware address */
        bp->bc_waddr = (uint8_t *)(BMAP_BMP   + BMAP_OFFSET);

        rfcnt.p.rfc_hcnt = 7;                   /* shift left   16 dot */
        rfcnt.p.rfc_vcnt = -27;                 /* shift down    1 dot */
        *bmd_rfcnt = rfcnt.u;

        bp->bc_stat  = STAT_NORMAL;

        bp->bc_xmin  = 8;
        bp->bc_xmax  = 96;
        bp->bc_ymin  = 2;
        bp->bc_ymax  = 48;

        bp->bc_row = bp->bc_ymin;

        for (i = bp->bc_ymin; i < bp->bc_ymax; i++) {
                bmd_linec[i].bl_next = &bmd_linec[i + 1];
                bmd_linec[i].bl_prev = &bmd_linec[i - 1];
        }
        bmd_linec[bp->bc_ymax - 1].bl_next = &bmd_linec[bp->bc_ymin];
        bmd_linec[bp->bc_ymin].bl_prev = &bmd_linec[bp->bc_ymax - 1];

        bq = bp->bc_bl = &bmd_linec[bp->bc_ymin];
        bq->bl_col = bq->bl_end = bp->bc_xmin;

        bp->bc_col = bp->bc_xmin;

        bp->bc_esc = &bp->bc_escseq[0];
        bp->bc_escape = bmd_escape;

        *bmd_bmsel = 0xff;                              /* all planes */
        bmd_erase_screen((uint32_t *)bp->bc_waddr);     /* clear screen */
        *bmd_bmsel = 0x01;                              /* 1 plane */

        /* turn on cursor */
        bmd_reverse_char(bp->bc_raddr,
                         bp->bc_waddr,
                         bq->bl_col, bp->bc_row);
}

void
bmdadjust(int16_t hcnt, int16_t vcnt)
{
        volatile uint32_t *bmd_rfcnt = (uint32_t *)BMAP_RFCNT;
        union bmd_rfcnt rfcnt;

        printf("bmdadjust: hcnt = %d, vcnt = %d\n", hcnt, vcnt);

        rfcnt.p.rfc_hcnt = hcnt;                /* shift left   16 dot */
        rfcnt.p.rfc_vcnt = vcnt;                /* shift down    1 dot */

        *bmd_rfcnt = rfcnt.u;
}

int
bmdputc(int c)
{
        struct bmd_softc *bp = &bmd_softc;
        struct bmd_linec *bq = bp->bc_bl;
        int i;

        c &= 0x7F;

        /* turn off cursor */
        bmd_reverse_char(bp->bc_raddr,
                         bp->bc_waddr,
                         bq->bl_col, bp->bc_row);

        /* do escape-sequence */
        if (bp->bc_stat & STAT_ESCAPE) {
                *bp->bc_esc++ = c;
                (*bp->bc_escape)(c);
                goto done;
        }

        if (isprint(c)) {
                bmd_draw_char(bp->bc_raddr, bp->bc_waddr,
                              bq->bl_col, bp->bc_row, c);
                bq->bl_col++;
                bq->bl_end++;
                if (bq->bl_col >= bp->bc_xmax) {
                        bq->bl_col = bq->bl_end = bp->bc_xmin;
                        bp->bc_row++;
                        if (bp->bc_row >= bp->bc_ymax) {
                                bmd_scroll_screen((uint32_t *)bp->bc_raddr,
                                                  (uint32_t *)bp->bc_waddr,
                                                  bp->bc_xmin, bp->bc_xmax,
                                                  bp->bc_ymin, bp->bc_ymax);

                                bp->bc_row = bp->bc_ymax - 1;
                        }
                }
        } else {
                switch (c) {
                case 0x08:                              /* BS */
                        if (bq->bl_col > bp->bc_xmin) {
                                bq->bl_col--;
                        }
                        break;

                case 0x09:                              /* HT */
                case 0x0B:                              /* VT */
                        i = ((bq->bl_col / 8) + 1) * 8;
                        if (i < bp->bc_xmax) {
                                bq->bl_col = bq->bl_end = i;
                        }
                        break;

                case 0x0A:                              /* NL */
                        bp->bc_row++;
                        if (bp->bc_row >= bp->bc_ymax) {
                                bmd_scroll_screen((uint32_t *)bp->bc_raddr,
                                                  (uint32_t *)bp->bc_waddr,
                                                  bp->bc_xmin, bp->bc_xmax,
                                                  bp->bc_ymin, bp->bc_ymax);

                                bp->bc_row = bp->bc_ymax - 1;
                        }
                        break;

                case 0x0D:                              /* CR */
                        bq->bl_col = bp->bc_xmin;
                        break;

                case 0x1B:                              /* ESC */
                        bp->bc_stat |= STAT_ESCAPE;
                        *bp->bc_esc++ = 0x1b;
                        break;

                case 0x7F:                              /* DEL */
                        if (bq->bl_col > bp->bc_xmin) {
                                bq->bl_col--;
                                bmd_erase_char(bp->bc_raddr,
                                               bp->bc_waddr,
                                               bq->bl_col, bp->bc_row);
                        }
                        break;

                default:
                        break;
                }
        }

 done:
        /* turn on  cursor */
        bmd_reverse_char(bp->bc_raddr,
                         bp->bc_waddr,
                         bq->bl_col, bp->bc_row);

        return c;
}

void
bmdclear(void)
{
        struct bmd_softc *bp = &bmd_softc;
        struct bmd_linec *bq = bp->bc_bl;

        /* clear screen */
        bmd_erase_screen((uint32_t *)bp->bc_waddr);

        bq->bl_col = bq->bl_end = bp->bc_xmin;
        bp->bc_row = bp->bc_ymin;

        /* turn on cursor */
        bmd_reverse_char(bp->bc_raddr,
                         bp->bc_waddr,
                         bq->bl_col, bp->bc_row);
}


/*
 *  character operation routines
 */

static void
bmd_draw_char(uint8_t *raddr, uint8_t *waddr, int col, int row, int c)
{
        volatile uint16_t *p, *q;
        volatile uint32_t *lp, *lq;
        const uint16_t *fp;
        int i;

        fp = &bmdfont[c][0];

        switch (col % 4) {

        case 0:
                p = (uint16_t *)(raddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6));
                q = (uint16_t *)(waddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6));
                for (i = 0; i < FB_HEIGHT; i++) {
                        *q = (*p & 0x000F) | (*fp & 0xFFF0);
                        p += 128;
                        q += 128;
                        fp++;
                }
                break;

        case 1:
                lp = (uint32_t *)(raddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6));
                lq = (uint32_t *)(waddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6));
                for (i = 0; i < FB_HEIGHT; i++) {
                        *lq = (*lp & 0xFFF000FF) |
                            ((uint32_t)(*fp & 0xFFF0) << 4);
                        lp += 64;
                        lq += 64;
                        fp++;
                }
                break;

        case 2:
                lp = (uint32_t *)(raddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6) + 2);
                lq = (uint32_t *)(waddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6) + 2);
                for (i = 0; i < FB_HEIGHT; i++) {
                        *lq = (*lp & 0xFF000FFF) |
                            ((uint32_t)(*fp & 0xFFF0) << 8);
                        lp += 64;
                        lq += 64;
                        fp++;
                }
                break;

        case 3:
                p = (uint16_t *)(raddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6) + 4);
                q = (uint16_t *)(waddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6) + 4);
                for (i = 0; i < FB_HEIGHT; i++) {
                        *q = (*p & 0xF000) | ((*fp & 0xFFF0) >> 4);
                        p += 128;
                        q += 128;
                        fp++;
                }
                break;

        default:
                break;
        }
}

static void
bmd_reverse_char(uint8_t *raddr, uint8_t *waddr, int col, int row)
{
        volatile uint16_t *p, *q;
        volatile uint32_t *lp, *lq;
        int i;

        switch (col % 4) {

        case 0:
                p = (uint16_t *)(raddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6));
                q = (uint16_t *)(waddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6));
                for (i = 0; i < FB_HEIGHT; i++) {
                        *q = (*p & 0x000F) | (~(*p) & 0xFFF0);
                        p += 128;
                        q += 128;
                }
                break;

        case 1:
                lp = (uint32_t *)(raddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6));
                lq = (uint32_t *)(waddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6));
                for (i = 0; i < FB_HEIGHT; i++) {
                        *lq = (*lp & 0xFFF000FF) | (~(*lp) & 0x000FFF00);
                        lp += 64;
                        lq += 64;
                }
                break;

        case 2:
                lp = (uint32_t *)(raddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6) + 2);
                lq = (uint32_t *)(waddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6) + 2);
                for (i = 0; i < FB_HEIGHT; i++) {
                        *lq = (*lp & 0xFF000FFF) | (~(*lp) & 0x00FFF000);
                        lp += 64;
                        lq += 64;
                }
                break;

        case 3:
                p = (uint16_t *)(raddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6) + 4);
                q = (uint16_t *)(waddr + ((row * FB_HEIGHT) << 8)
                    + ((col / 4) * 6) + 4);
                for (i = 0; i < FB_HEIGHT; i++) {
                        *q = (*p & 0xF000) | (~(*p) & 0x0FFF);
                        p += 128;
                        q += 128;
                }
                break;

        default:
                break;
        }
}

static void
bmd_erase_char(uint8_t *raddr, uint8_t *waddr, int col, int row)
{

        bmd_draw_char(raddr, waddr, col, row, 0);
}


/*
 * screen operation routines
 */

static void
bmd_erase_screen(volatile uint32_t *lp)
{
        int i, j;

        for (i = 0; i < SB_HEIGHT; i++) {
                for (j = 0; j < SL_WIDTH; j++)
                        *lp++ = 0;
                SKIP_NEXT_LINE(lp);
        }
}

static void
bmd_scroll_screen(volatile uint32_t *lp, volatile uint32_t *lq,
    int xmin, int xmax, int ymin, int ymax)
{
        int i, j;

        lp += ((PL_WIDTH * FB_HEIGHT) * (ymin + 1));
        lq += ((PL_WIDTH * FB_HEIGHT) *  ymin);

        for (i = 0; i < ((ymax - ymin -1) * FB_HEIGHT); i++) {
                for (j = 0; j < SL_WIDTH; j++) {
                        *lq++ = *lp++;
                }
                lp += (PL_WIDTH - SL_WIDTH);
                lq += (PL_WIDTH - SL_WIDTH);
        }

        for (i = 0; i < FB_HEIGHT; i++) {
                for (j = 0; j < SL_WIDTH; j++) {
                        *lq++ = 0;
                }
                lq += (PL_WIDTH - SL_WIDTH);
        }
}