sticon.c

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/*
 *  linux/drivers/video/console/sticon.c - console driver using HP's STI firmware
 *
 *  Copyright (C) 2000 Philipp Rumpf <[email protected]>
 *  Copyright (C) 2002 Helge Deller <[email protected]>
 *
 *  Based on linux/drivers/video/vgacon.c and linux/drivers/video/fbcon.c,
 *  which were
 *
 *  Created 28 Sep 1997 by Geert Uytterhoeven
 *  Rewritten by Martin Mares <[email protected]>, July 1998
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *              1995  Jay Estabrook
 *  Copyright (C) 1995 Geert Uytterhoeven
 *  Copyright (C) 1993 Bjoern Brauel
 *             Roman Hodek
 *  Copyright (C) 1993 Hamish Macdonald
 *             Greg Harp
 *  Copyright (C) 1994 David Carter [[email protected]]
 *
 *        with work by William Rucklidge ([email protected])
 *             Geert Uytterhoeven
 *             Jes Sorensen ([email protected])
 *             Martin Apel
 *        with work by Guenther Kelleter
 *             Martin Schaller
 *             Andreas Schwab
 *             Emmanuel Marty ([email protected])
 *             Jakub Jelinek ([email protected])
 *             Martin Mares <[email protected]>
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 *
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/errno.h>
#include <linux/vt_kern.h>
#include <linux/kd.h>
#include <linux/selection.h>
#include <linux/module.h>

#include <asm/io.h>

#include "../sticore.h"

/* switching to graphics mode */
#define BLANK 0
static int vga_is_gfx;

/* this is the sti_struct used for this console */
static struct sti_struct *sticon_sti;

/* Software scrollback */
static unsigned long softback_buf, softback_curr;
static unsigned long softback_in;
static unsigned long /* softback_top, */ softback_end;
static int softback_lines;

/* software cursor */
static int cursor_drawn;
#define CURSOR_DRAW_DELAY       (1)
#define DEFAULT_CURSOR_BLINK_RATE   (20)

static int vbl_cursor_cnt;

static inline void cursor_undrawn(void)
{
    vbl_cursor_cnt = 0;
    cursor_drawn = 0;
}

static const char *sticon_startup(void)
{
    return "STI console";
}

static int sticon_set_palette(struct vc_data *c, unsigned char *table)
{
    return -EINVAL;
}

static void sticon_putc(struct vc_data *conp, int c, int ypos, int xpos)
{
    int redraw_cursor = 0;

    if (vga_is_gfx || console_blanked)
        return;

    if (conp->vc_mode != KD_TEXT)
            return;
#if 0
    if ((p->cursor_x == xpos) && (p->cursor_y == ypos)) {
        cursor_undrawn();
        redraw_cursor = 1;
    }
#endif

    sti_putc(sticon_sti, c, ypos, xpos);

    if (redraw_cursor)
        vbl_cursor_cnt = CURSOR_DRAW_DELAY;
}

static void sticon_putcs(struct vc_data *conp, const unsigned short *s,
             int count, int ypos, int xpos)
{
    int redraw_cursor = 0;

    if (vga_is_gfx || console_blanked)
        return;

    if (conp->vc_mode != KD_TEXT)
            return;

#if 0
    if ((p->cursor_y == ypos) && (xpos <= p->cursor_x) &&
    (p->cursor_x < (xpos + count))) {
        cursor_undrawn();
        redraw_cursor = 1;
    }
#endif

    while (count--) {
    sti_putc(sticon_sti, scr_readw(s++), ypos, xpos++);
    }

    if (redraw_cursor)
        vbl_cursor_cnt = CURSOR_DRAW_DELAY;
}

static void sticon_cursor(struct vc_data *conp, int mode)
{
    unsigned short car1;

    car1 = conp->vc_screenbuf[conp->vc_x + conp->vc_y * conp->vc_cols];
    switch (mode) {
    case CM_ERASE:
    sti_putc(sticon_sti, car1, conp->vc_y, conp->vc_x);
    break;
    case CM_MOVE:
    case CM_DRAW:
    switch (conp->vc_cursor_type & 0x0f) {
    case CUR_UNDERLINE:
    case CUR_LOWER_THIRD:
    case CUR_LOWER_HALF:
    case CUR_TWO_THIRDS:
    case CUR_BLOCK:
        sti_putc(sticon_sti, (car1 & 255) + (0 << 8) + (7 << 11),
             conp->vc_y, conp->vc_x);
        break;
    }
    break;
    }
}

static int sticon_scroll(struct vc_data *conp, int t, int b, int dir, int count)
{
    struct sti_struct *sti = sticon_sti;

    if (vga_is_gfx)
        return 0;

    sticon_cursor(conp, CM_ERASE);

    switch (dir) {
    case SM_UP:
    sti_bmove(sti, t + count, 0, t, 0, b - t - count, conp->vc_cols);
    sti_clear(sti, b - count, 0, count, conp->vc_cols, conp->vc_video_erase_char);
    break;

    case SM_DOWN:
    sti_bmove(sti, t, 0, t + count, 0, b - t - count, conp->vc_cols);
    sti_clear(sti, t, 0, count, conp->vc_cols, conp->vc_video_erase_char);
    break;
    }

    return 0;
}

static void sticon_bmove(struct vc_data *conp, int sy, int sx, 
    int dy, int dx, int height, int width)
{
    if (!width || !height)
        return;
#if 0
    if (((sy <= p->cursor_y) && (p->cursor_y < sy+height) &&
    (sx <= p->cursor_x) && (p->cursor_x < sx+width)) ||
    ((dy <= p->cursor_y) && (p->cursor_y < dy+height) &&
    (dx <= p->cursor_x) && (p->cursor_x < dx+width)))
        sticon_cursor(p, CM_ERASE /*|CM_SOFTBACK*/);
#endif

    sti_bmove(sticon_sti, sy, sx, dy, dx, height, width);
}

static void sticon_init(struct vc_data *c, int init)
{
    struct sti_struct *sti = sticon_sti;
    int vc_cols, vc_rows;

    sti_set(sti, 0, 0, sti_onscreen_y(sti), sti_onscreen_x(sti), 0);
    vc_cols = sti_onscreen_x(sti) / sti->font_width;
    vc_rows = sti_onscreen_y(sti) / sti->font_height;
    c->vc_can_do_color = 1;
    
    if (init) {
    c->vc_cols = vc_cols;
    c->vc_rows = vc_rows;
    } else {
    /* vc_rows = (c->vc_rows > vc_rows) ? vc_rows : c->vc_rows; */
    /* vc_cols = (c->vc_cols > vc_cols) ? vc_cols : c->vc_cols; */
    vc_resize(c, vc_cols, vc_rows);
/*  vc_resize_con(vc_rows, vc_cols, c->vc_num); */
    }
}

static void sticon_deinit(struct vc_data *c)
{
}

static void sticon_clear(struct vc_data *conp, int sy, int sx, int height,
             int width)
{
    if (!height || !width)
    return;

    sti_clear(sticon_sti, sy, sx, height, width, conp->vc_video_erase_char);
}

static int sticon_switch(struct vc_data *conp)
{
    return 1;   /* needs refreshing */
}

static int sticon_set_origin(struct vc_data *conp)
{
    return 0;
}

static int sticon_blank(struct vc_data *c, int blank, int mode_switch)
{
    if (blank == 0) {
    if (mode_switch)
        vga_is_gfx = 0;
    return 1;
    }
    sticon_set_origin(c);
    sti_clear(sticon_sti, 0,0, c->vc_rows, c->vc_cols, BLANK);
    if (mode_switch)
    vga_is_gfx = 1;
    return 1;
}

static int sticon_scrolldelta(struct vc_data *conp, int lines)
{
    return 0;
}

static u16 *sticon_screen_pos(struct vc_data *conp, int offset)
{
    int line;
    unsigned long p;

    if (conp->vc_num != fg_console || !softback_lines)
        return (u16 *)(conp->vc_origin + offset);
    line = offset / conp->vc_size_row;
    if (line >= softback_lines)
        return (u16 *)(conp->vc_origin + offset - softback_lines * conp->vc_size_row);
    p = softback_curr + offset;
    if (p >= softback_end)
        p += softback_buf - softback_end;
    return (u16 *)p;
}

static unsigned long sticon_getxy(struct vc_data *conp, unsigned long pos,
                  int *px, int *py)
{
    int x, y;
    unsigned long ret;
    if (pos >= conp->vc_origin && pos < conp->vc_scr_end) {
        unsigned long offset = (pos - conp->vc_origin) / 2;
        
        x = offset % conp->vc_cols;
        y = offset / conp->vc_cols;
        if (conp->vc_num == fg_console)
            y += softback_lines;
        ret = pos + (conp->vc_cols - x) * 2;
    } else if (conp->vc_num == fg_console && softback_lines) {
        unsigned long offset = pos - softback_curr;
        
        if (pos < softback_curr)
            offset += softback_end - softback_buf;
        offset /= 2;
        x = offset % conp->vc_cols;
        y = offset / conp->vc_cols;
    ret = pos + (conp->vc_cols - x) * 2;
    if (ret == softback_end)
        ret = softback_buf;
    if (ret == softback_in)
        ret = conp->vc_origin;
    } else {
        /* Should not happen */
        x = y = 0;
        ret = conp->vc_origin;
    }
    if (px) *px = x;
    if (py) *py = y;
    return ret;
}

static u8 sticon_build_attr(struct vc_data *conp, u8 color, u8 intens,
                u8 blink, u8 underline, u8 reverse, u8 italic)
{
    u8 attr = ((color & 0x70) >> 1) | ((color & 7));

    if (reverse) {
    color = ((color >> 3) & 0x7) | ((color & 0x7) << 3);
    }

    return attr;
}

static void sticon_invert_region(struct vc_data *conp, u16 *p, int count)
{
    int col = 1; /* vga_can_do_color; */

    while (count--) {
    u16 a = scr_readw(p);

    if (col)
        a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
    else
        a = ((a & 0x0700) == 0x0100) ? 0x7000 : 0x7700;

    scr_writew(a, p++);
    }
}

static void sticon_save_screen(struct vc_data *conp)
{
}

static const struct consw sti_con = {
    .owner          = THIS_MODULE,
    .con_startup        = sticon_startup,
    .con_init       = sticon_init,
    .con_deinit     = sticon_deinit,
    .con_clear      = sticon_clear,
    .con_putc       = sticon_putc,
    .con_putcs      = sticon_putcs,
    .con_cursor     = sticon_cursor,
    .con_scroll     = sticon_scroll,
    .con_bmove      = sticon_bmove,
    .con_switch     = sticon_switch,
    .con_blank      = sticon_blank,
    .con_set_palette    = sticon_set_palette,
    .con_scrolldelta    = sticon_scrolldelta,
    .con_set_origin     = sticon_set_origin,
    .con_save_screen    = sticon_save_screen, 
    .con_build_attr     = sticon_build_attr,
    .con_invert_region  = sticon_invert_region, 
    .con_screen_pos     = sticon_screen_pos,
    .con_getxy      = sticon_getxy,
};



static int __init sticonsole_init(void)
{
    /* already initialized ? */
    if (sticon_sti)
     return 0;

    sticon_sti = sti_get_rom(0);
    if (!sticon_sti)
    return -ENODEV;

    if (conswitchp == &dummy_con) {
    printk(KERN_INFO "sticon: Initializing STI text console.\n");
    return take_over_console(&sti_con, 0, MAX_NR_CONSOLES - 1, 1);
    }
    return 0;
}

module_init(sticonsole_init);
MODULE_LICENSE("GPL");