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/*

 *  linux/drivers/video/mdacon.c -- Low level MDA based console driver

 *

 *      (c) 1998 Andrew Apted <ajapted@netspace.net.au>

 *

 *      including portions (c) 1995-1998 Patrick Caulfield.

 *

 *      slight improvements (c) 2000 Edward Betts <edward@debian.org>

 *

 *  This file is based on the VGA console driver (vgacon.c):

 *

 *      Created 28 Sep 1997 by Geert Uytterhoeven

 *

 *      Rewritten by Martin Mares <mj@ucw.cz>, July 1998

 *

 *  and on the old console.c, vga.c and vesa_blank.c drivers:

 *

 *      Copyright (C) 1991, 1992  Linus Torvalds

 *                          1995  Jay Estabrook

 *

 *  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.

 *

 *  Changelog:

 *  Paul G. (03/2001) Fix mdacon= boot prompt to use __setup().

 */

#include <linux/types.h>

#include <linux/fs.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/console.h>

#include <linux/string.h>

#include <linux/kd.h>

#include <linux/slab.h>

#include <linux/vt_kern.h>

#include <linux/vt_buffer.h>

#include <linux/selection.h>

#include <linux/spinlock.h>

#include <linux/ioport.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <asm/io.h>

#include <asm/vga.h>

static DEFINE_SPINLOCK(mda_lock);

/* description of the hardware layout */

static unsigned long    mda_vram_base;          /* Base of video memory */

static unsigned long    mda_vram_len;           /* Size of video memory */

static unsigned int     mda_num_columns;        /* Number of text columns */

static unsigned int     mda_num_lines;          /* Number of text lines */

static unsigned int     mda_index_port;         /* Register select port */

static unsigned int     mda_value_port;         /* Register value port */

static unsigned int     mda_mode_port;          /* Mode control port */

static unsigned int     mda_status_port;        /* Status and Config port */

static unsigned int     mda_gfx_port;           /* Graphics control port */

/* current hardware state */

static int      mda_cursor_loc=-1;

static int      mda_cursor_size_from=-1;

static int      mda_cursor_size_to=-1;

static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;

static char *mda_type_name;

/* console information */

static int      mda_first_vc = 1;

static int      mda_last_vc  = 16;

static struct vc_data   *mda_display_fg = NULL;

module_param(mda_first_vc, int, 0);

module_param(mda_last_vc, int, 0);

/* MDA register values

 */

#define MDA_CURSOR_BLINKING     0x00

#define MDA_CURSOR_OFF          0x20

#define MDA_CURSOR_SLOWBLINK    0x60

#define MDA_MODE_GRAPHICS       0x02

#define MDA_MODE_VIDEO_EN       0x08

#define MDA_MODE_BLINK_EN       0x20

#define MDA_MODE_GFX_PAGE1      0x80

#define MDA_STATUS_HSYNC        0x01

#define MDA_STATUS_VSYNC        0x80

#define MDA_STATUS_VIDEO        0x08

#define MDA_CONFIG_COL132       0x08

#define MDA_GFX_MODE_EN         0x01

#define MDA_GFX_PAGE_EN         0x02

/*

 * MDA could easily be classified as "pre-dinosaur hardware".

 */

static void write_mda_b(unsigned int val, unsigned char reg)

{

        unsigned long flags;

        spin_lock_irqsave(&mda_lock, flags);

        outb_p(reg, mda_index_port);

        outb_p(val, mda_value_port);

        spin_unlock_irqrestore(&mda_lock, flags);

}

static void write_mda_w(unsigned int val, unsigned char reg)

{

        unsigned long flags;

        spin_lock_irqsave(&mda_lock, flags);

        outb_p(reg,   mda_index_port); outb_p(val >> 8,   mda_value_port);

        outb_p(reg+1, mda_index_port); outb_p(val & 0xff, mda_value_port);

        spin_unlock_irqrestore(&mda_lock, flags);

}

#ifdef TEST_MDA_B

static int test_mda_b(unsigned char val, unsigned char reg)

{

        unsigned long flags;

        spin_lock_irqsave(&mda_lock, flags);

        outb_p(reg, mda_index_port);

        outb  (val, mda_value_port);

        udelay(20); val = (inb_p(mda_value_port) == val);

        spin_unlock_irqrestore(&mda_lock, flags);

        return val;

}

#endif

static inline void mda_set_cursor(unsigned int location)

{

        if (mda_cursor_loc == location)

                return;

        write_mda_w(location >> 1, 0x0e);

        mda_cursor_loc = location;

}

static inline void mda_set_cursor_size(int from, int to)

{

        if (mda_cursor_size_from==from && mda_cursor_size_to==to)

                return;

        if (from > to) {

                write_mda_b(MDA_CURSOR_OFF, 0x0a);      /* disable cursor */

        } else {

                write_mda_b(from, 0x0a);        /* cursor start */

                write_mda_b(to,   0x0b);        /* cursor end */

        }

        mda_cursor_size_from = from;

        mda_cursor_size_to   = to;

}

#ifndef MODULE

static int __init mdacon_setup(char *str)

{

        /* command line format: mdacon=<first>,<last> */

        int ints[3];

        str = get_options(str, ARRAY_SIZE(ints), ints);

        if (ints[0] < 2)

                return 0;

        if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES ||

            ints[2] < 1 || ints[2] > MAX_NR_CONSOLES)

                return 0;

        mda_first_vc = ints[1];

        mda_last_vc  = ints[2];

        return 1;

}

__setup("mdacon=", mdacon_setup);

#endif

static int mda_detect(void)

{

        int count=0;

        u16 *p, p_save;

        u16 *q, q_save;

        /* do a memory check */

        p = (u16 *) mda_vram_base;

        q = (u16 *) (mda_vram_base + 0x01000);

        p_save = scr_readw(p); q_save = scr_readw(q);

        scr_writew(0xAA55, p); if (scr_readw(p) == 0xAA55) count++;

        scr_writew(0x55AA, p); if (scr_readw(p) == 0x55AA) count++;

        scr_writew(p_save, p);

        if (count != 2) {

                return 0;

        }

        /* check if we have 4K or 8K */

        scr_writew(0xA55A, q); scr_writew(0x0000, p);

        if (scr_readw(q) == 0xA55A) count++;

        scr_writew(0x5AA5, q); scr_writew(0x0000, p);

        if (scr_readw(q) == 0x5AA5) count++;

        scr_writew(p_save, p); scr_writew(q_save, q);

        if (count == 4) {

                mda_vram_len = 0x02000;

        }

        /* Ok, there is definitely a card registering at the correct

         * memory location, so now we do an I/O port test.

         */

#ifdef TEST_MDA_B

        /* Edward: These two mess `tests' mess up my cursor on bootup */

        /* cursor low register */

        if (! test_mda_b(0x66, 0x0f)) {

                return 0;

        }

        /* cursor low register */

        if (! test_mda_b(0x99, 0x0f)) {

                return 0;

        }

#endif

        /* See if the card is a Hercules, by checking whether the vsync

         * bit of the status register is changing.  This test lasts for

         * approximately 1/10th of a second.

         */

        p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;

        for (count=0; count < 50000 && p_save == q_save; count++) {

                q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;

                udelay(2);

        }

        if (p_save != q_save) {

                switch (inb_p(mda_status_port) & 0x70) {

                        case 0x10:

                                mda_type = TYPE_HERCPLUS;

                                mda_type_name = "HerculesPlus";

                                break;

                        case 0x50:

                                mda_type = TYPE_HERCCOLOR;

                                mda_type_name = "HerculesColor";

                                break;

                        default:

                                mda_type = TYPE_HERC;

                                mda_type_name = "Hercules";

                                break;

                }

        }

        return 1;

}

static void mda_initialize(void)

{

        write_mda_b(97, 0x00);          /* horizontal total */

        write_mda_b(80, 0x01);          /* horizontal displayed */

        write_mda_b(82, 0x02);          /* horizontal sync pos */

        write_mda_b(15, 0x03);          /* horizontal sync width */

        write_mda_b(25, 0x04);          /* vertical total */

        write_mda_b(6,  0x05);          /* vertical total adjust */

        write_mda_b(25, 0x06);          /* vertical displayed */

        write_mda_b(25, 0x07);          /* vertical sync pos */

        write_mda_b(2,  0x08);          /* interlace mode */

        write_mda_b(13, 0x09);          /* maximum scanline */

        write_mda_b(12, 0x0a);          /* cursor start */

        write_mda_b(13, 0x0b);          /* cursor end */

        write_mda_w(0x0000, 0x0c);      /* start address */

        write_mda_w(0x0000, 0x0e);      /* cursor location */

        outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port);

        outb_p(0x00, mda_status_port);

        outb_p(0x00, mda_gfx_port);

}

static const char *mdacon_startup(void)

{

        mda_num_columns = 80;

        mda_num_lines   = 25;

        mda_vram_len  = 0x01000;

        mda_vram_base = VGA_MAP_MEM(0xb0000, mda_vram_len);

        mda_index_port  = 0x3b4;

        mda_value_port  = 0x3b5;

        mda_mode_port   = 0x3b8;

        mda_status_port = 0x3ba;

        mda_gfx_port    = 0x3bf;

        mda_type = TYPE_MDA;

        mda_type_name = "MDA";

        if (! mda_detect()) {

                printk("mdacon: MDA card not detected.\n");

                return NULL;

        }

        if (mda_type != TYPE_MDA) {

                mda_initialize();

        }

        /* cursor looks ugly during boot-up, so turn it off */

        mda_set_cursor(mda_vram_len - 1);

        printk("mdacon: %s with %ldK of memory detected.\n",

                mda_type_name, mda_vram_len/1024);

        return "MDA-2";

}

static void mdacon_init(struct vc_data *c, int init)

{

        c->vc_complement_mask = 0x0800;  /* reverse video */

        c->vc_display_fg = &mda_display_fg;

        if (init) {

                c->vc_cols = mda_num_columns;

                c->vc_rows = mda_num_lines;

        } else

                vc_resize(c, mda_num_columns, mda_num_lines);

        /* make the first MDA console visible */

        if (mda_display_fg == NULL)

                mda_display_fg = c;

}

static void mdacon_deinit(struct vc_data *c)

{

        /* con_set_default_unimap(c->vc_num); */

        if (mda_display_fg == c)

                mda_display_fg = NULL;

}

static inline u16 mda_convert_attr(u16 ch)

{

        u16 attr = 0x0700;

        /* Underline and reverse-video are mutually exclusive on MDA.

         * Since reverse-video is used for cursors and selected areas,

         * it takes precedence.

         */

        if (ch & 0x0800)        attr = 0x7000;  /* reverse */

        else if (ch & 0x0400)   attr = 0x0100;  /* underline */

        return ((ch & 0x0200) << 2) |           /* intensity */

                (ch & 0x8000) |                 /* blink */

                (ch & 0x00ff) | attr;

}

static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity,

                            u8 blink, u8 underline, u8 reverse, u8 italic)

{

        /* The attribute is just a bit vector:

         *

         *      Bit 0..1 : intensity (0..2)

         *      Bit 2    : underline

         *      Bit 3    : reverse

         *      Bit 7    : blink

         */

        return (intensity & 3) |

                ((underline & 1) << 2) |

                ((reverse   & 1) << 3) |

                (!!italic << 4) |

                ((blink     & 1) << 7);

}

static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)

{

        for (; count > 0; count--) {

                scr_writew(scr_readw(p) ^ 0x0800, p);

                p++;

        }

}

#define MDA_ADDR(x,y)  ((u16 *) mda_vram_base + (y)*mda_num_columns + (x))

static void mdacon_putc(struct vc_data *c, int ch, int y, int x)

{

        scr_writew(mda_convert_attr(ch), MDA_ADDR(x, y));

}

static void mdacon_putcs(struct vc_data *c, const unsigned short *s,

                         int count, int y, int x)

{

        u16 *dest = MDA_ADDR(x, y);

        for (; count > 0; count--) {

                scr_writew(mda_convert_attr(scr_readw(s++)), dest++);

        }

}

static void mdacon_clear(struct vc_data *c, int y, int x,

                          int height, int width)

{

        u16 *dest = MDA_ADDR(x, y);

        u16 eattr = mda_convert_attr(c->vc_video_erase_char);

        if (width <= 0 || height <= 0)

                return;

        if (x==0 && width==mda_num_columns) {

                scr_memsetw(dest, eattr, height*width*2);

        } else {

                for (; height > 0; height--, dest+=mda_num_columns)

                        scr_memsetw(dest, eattr, width*2);

        }

}

static void mdacon_bmove(struct vc_data *c, int sy, int sx,

                         int dy, int dx, int height, int width)

{

        u16 *src, *dest;

        if (width <= 0 || height <= 0)

                return;

        if (sx==0 && dx==0 && width==mda_num_columns) {

                scr_memmovew(MDA_ADDR(0,dy), MDA_ADDR(0,sy), height*width*2);

        } else if (dy < sy || (dy == sy && dx < sx)) {

                src  = MDA_ADDR(sx, sy);

                dest = MDA_ADDR(dx, dy);

                for (; height > 0; height--) {

                        scr_memmovew(dest, src, width*2);

                        src  += mda_num_columns;

                        dest += mda_num_columns;

                }

        } else {

                src  = MDA_ADDR(sx, sy+height-1);

                dest = MDA_ADDR(dx, dy+height-1);

                for (; height > 0; height--) {

                        scr_memmovew(dest, src, width*2);

                        src  -= mda_num_columns;

                        dest -= mda_num_columns;

                }

        }

}

static int mdacon_switch(struct vc_data *c)

{

        return 1;       /* redrawing needed */

}

static int mdacon_set_palette(struct vc_data *c, unsigned char *table)

{

        return -EINVAL;

}

static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)

{

        if (mda_type == TYPE_MDA) {

                if (blank)

                        scr_memsetw((void *)mda_vram_base,

                                mda_convert_attr(c->vc_video_erase_char),

                                c->vc_screenbuf_size);

                /* Tell console.c that it has to restore the screen itself */

                return 1;

        } else {

                if (blank)

                        outb_p(0x00, mda_mode_port);    /* disable video */

                else

                        outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN,

                                mda_mode_port);

                return 0;

        }

}

static int mdacon_scrolldelta(struct vc_data *c, int lines)

{

        return 0;

}

static void mdacon_cursor(struct vc_data *c, int mode)

{

        if (mode == CM_ERASE) {

                mda_set_cursor(mda_vram_len - 1);

                return;

        }

        mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2);

        switch (c->vc_cursor_type & 0x0f) {

                case CUR_LOWER_THIRD:   mda_set_cursor_size(10, 13); break;

                case CUR_LOWER_HALF:    mda_set_cursor_size(7,  13); break;

                case CUR_TWO_THIRDS:    mda_set_cursor_size(4,  13); break;

                case CUR_BLOCK:         mda_set_cursor_size(1,  13); break;

                case CUR_NONE:          mda_set_cursor_size(14, 13); break;

                default:                mda_set_cursor_size(12, 13); break;

        }

}

static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines)

{

        u16 eattr = mda_convert_attr(c->vc_video_erase_char);

        if (!lines)

                return 0;

        if (lines > c->vc_rows)   /* maximum realistic size */

                lines = c->vc_rows;

        switch (dir) {

        case SM_UP:

                scr_memmovew(MDA_ADDR(0,t), MDA_ADDR(0,t+lines),

                                (b-t-lines)*mda_num_columns*2);

                scr_memsetw(MDA_ADDR(0,b-lines), eattr,

                                lines*mda_num_columns*2);

                break;

        case SM_DOWN:

                scr_memmovew(MDA_ADDR(0,t+lines), MDA_ADDR(0,t),

                                (b-t-lines)*mda_num_columns*2);

                scr_memsetw(MDA_ADDR(0,t), eattr, lines*mda_num_columns*2);

                break;

        }

        return 0;

}

/*

 *  The console `switch' structure for the MDA based console

 */

static const struct consw mda_con = {

        .owner =                THIS_MODULE,

        .con_startup =          mdacon_startup,

        .con_init =             mdacon_init,

        .con_deinit =           mdacon_deinit,

        .con_clear =            mdacon_clear,

        .con_putc =             mdacon_putc,

        .con_putcs =            mdacon_putcs,

        .con_cursor =           mdacon_cursor,

        .con_scroll =           mdacon_scroll,

        .con_bmove =            mdacon_bmove,

        .con_switch =           mdacon_switch,

        .con_blank =            mdacon_blank,

        .con_set_palette =      mdacon_set_palette,

        .con_scrolldelta =      mdacon_scrolldelta,

        .con_build_attr =       mdacon_build_attr,

        .con_invert_region =    mdacon_invert_region,

};

int __init mda_console_init(void)

{

        if (mda_first_vc > mda_last_vc)

                return 1;

        return take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);

}

static void __exit mda_console_exit(void)

{

        give_up_console(&mda_con);

}

module_init(mda_console_init);

module_exit(mda_console_exit);

MODULE_LICENSE("GPL");