linux/drivers/video/console/mdacon.c
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   1/*
   2 *  linux/drivers/video/mdacon.c -- Low level MDA based console driver
   3 *
   4 *      (c) 1998 Andrew Apted <ajapted@netspace.net.au>
   5 *
   6 *      including portions (c) 1995-1998 Patrick Caulfield.
   7 *
   8 *      slight improvements (c) 2000 Edward Betts <edward@debian.org>
   9 *
  10 *  This file is based on the VGA console driver (vgacon.c):
  11 *      
  12 *      Created 28 Sep 1997 by Geert Uytterhoeven
  13 *
  14 *      Rewritten by Martin Mares <mj@ucw.cz>, July 1998
  15 *
  16 *  and on the old console.c, vga.c and vesa_blank.c drivers:
  17 *
  18 *      Copyright (C) 1991, 1992  Linus Torvalds
  19 *                          1995  Jay Estabrook
  20 *
  21 *  This file is subject to the terms and conditions of the GNU General Public
  22 *  License.  See the file COPYING in the main directory of this archive for
  23 *  more details.
  24 *
  25 *  Changelog:
  26 *  Paul G. (03/2001) Fix mdacon= boot prompt to use __setup().
  27 */
  28
  29#include <linux/types.h>
  30#include <linux/fs.h>
  31#include <linux/kernel.h>
  32#include <linux/module.h>
  33#include <linux/console.h>
  34#include <linux/string.h>
  35#include <linux/kd.h>
  36#include <linux/vt_kern.h>
  37#include <linux/vt_buffer.h>
  38#include <linux/selection.h>
  39#include <linux/spinlock.h>
  40#include <linux/ioport.h>
  41#include <linux/delay.h>
  42#include <linux/init.h>
  43
  44#include <asm/io.h>
  45#include <asm/vga.h>
  46
  47static DEFINE_SPINLOCK(mda_lock);
  48
  49/* description of the hardware layout */
  50
  51static unsigned long    mda_vram_base;          /* Base of video memory */
  52static unsigned long    mda_vram_len;           /* Size of video memory */
  53static unsigned int     mda_num_columns;        /* Number of text columns */
  54static unsigned int     mda_num_lines;          /* Number of text lines */
  55
  56static unsigned int     mda_index_port;         /* Register select port */
  57static unsigned int     mda_value_port;         /* Register value port */
  58static unsigned int     mda_mode_port;          /* Mode control port */
  59static unsigned int     mda_status_port;        /* Status and Config port */
  60static unsigned int     mda_gfx_port;           /* Graphics control port */
  61
  62/* current hardware state */
  63
  64static int      mda_cursor_loc=-1;
  65static int      mda_cursor_size_from=-1;
  66static int      mda_cursor_size_to=-1;
  67
  68static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;
  69static char *mda_type_name;
  70
  71/* console information */
  72
  73static int      mda_first_vc = 13;
  74static int      mda_last_vc  = 16;
  75
  76static struct vc_data   *mda_display_fg = NULL;
  77
  78module_param(mda_first_vc, int, 0);
  79MODULE_PARM_DESC(mda_first_vc, "First virtual console. Default: 13");
  80module_param(mda_last_vc, int, 0);
  81MODULE_PARM_DESC(mda_last_vc, "Last virtual console. Default: 16");
  82
  83/* MDA register values
  84 */
  85
  86#define MDA_CURSOR_BLINKING     0x00
  87#define MDA_CURSOR_OFF          0x20
  88#define MDA_CURSOR_SLOWBLINK    0x60
  89
  90#define MDA_MODE_GRAPHICS       0x02
  91#define MDA_MODE_VIDEO_EN       0x08
  92#define MDA_MODE_BLINK_EN       0x20
  93#define MDA_MODE_GFX_PAGE1      0x80
  94
  95#define MDA_STATUS_HSYNC        0x01
  96#define MDA_STATUS_VSYNC        0x80
  97#define MDA_STATUS_VIDEO        0x08
  98
  99#define MDA_CONFIG_COL132       0x08
 100#define MDA_GFX_MODE_EN         0x01
 101#define MDA_GFX_PAGE_EN         0x02
 102
 103
 104/*
 105 * MDA could easily be classified as "pre-dinosaur hardware".
 106 */
 107
 108static void write_mda_b(unsigned int val, unsigned char reg)
 109{
 110        unsigned long flags;
 111
 112        spin_lock_irqsave(&mda_lock, flags);    
 113
 114        outb_p(reg, mda_index_port); 
 115        outb_p(val, mda_value_port);
 116
 117        spin_unlock_irqrestore(&mda_lock, flags);
 118}
 119
 120static void write_mda_w(unsigned int val, unsigned char reg)
 121{
 122        unsigned long flags;
 123
 124        spin_lock_irqsave(&mda_lock, flags);
 125
 126        outb_p(reg,   mda_index_port); outb_p(val >> 8,   mda_value_port);
 127        outb_p(reg+1, mda_index_port); outb_p(val & 0xff, mda_value_port);
 128
 129        spin_unlock_irqrestore(&mda_lock, flags);
 130}
 131
 132#ifdef TEST_MDA_B
 133static int test_mda_b(unsigned char val, unsigned char reg)
 134{
 135        unsigned long flags;
 136
 137        spin_lock_irqsave(&mda_lock, flags);
 138
 139        outb_p(reg, mda_index_port); 
 140        outb  (val, mda_value_port);
 141
 142        udelay(20); val = (inb_p(mda_value_port) == val);
 143
 144        spin_unlock_irqrestore(&mda_lock, flags);
 145        return val;
 146}
 147#endif
 148
 149static inline void mda_set_cursor(unsigned int location) 
 150{
 151        if (mda_cursor_loc == location)
 152                return;
 153
 154        write_mda_w(location >> 1, 0x0e);
 155
 156        mda_cursor_loc = location;
 157}
 158
 159static inline void mda_set_cursor_size(int from, int to)
 160{
 161        if (mda_cursor_size_from==from && mda_cursor_size_to==to)
 162                return;
 163        
 164        if (from > to) {
 165                write_mda_b(MDA_CURSOR_OFF, 0x0a);      /* disable cursor */
 166        } else {
 167                write_mda_b(from, 0x0a);        /* cursor start */
 168                write_mda_b(to,   0x0b);        /* cursor end */
 169        }
 170
 171        mda_cursor_size_from = from;
 172        mda_cursor_size_to   = to;
 173}
 174
 175
 176#ifndef MODULE
 177static int __init mdacon_setup(char *str)
 178{
 179        /* command line format: mdacon=<first>,<last> */
 180
 181        int ints[3];
 182
 183        str = get_options(str, ARRAY_SIZE(ints), ints);
 184
 185        if (ints[0] < 2)
 186                return 0;
 187
 188        if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES || 
 189            ints[2] < 1 || ints[2] > MAX_NR_CONSOLES)
 190                return 0;
 191
 192        mda_first_vc = ints[1];
 193        mda_last_vc  = ints[2];
 194        return 1;
 195}
 196
 197__setup("mdacon=", mdacon_setup);
 198#endif
 199
 200static int mda_detect(void)
 201{
 202        int count=0;
 203        u16 *p, p_save;
 204        u16 *q, q_save;
 205
 206        /* do a memory check */
 207
 208        p = (u16 *) mda_vram_base;
 209        q = (u16 *) (mda_vram_base + 0x01000);
 210
 211        p_save = scr_readw(p); q_save = scr_readw(q);
 212
 213        scr_writew(0xAA55, p); if (scr_readw(p) == 0xAA55) count++;
 214        scr_writew(0x55AA, p); if (scr_readw(p) == 0x55AA) count++;
 215        scr_writew(p_save, p);
 216
 217        if (count != 2) {
 218                return 0;
 219        }
 220
 221        /* check if we have 4K or 8K */
 222
 223        scr_writew(0xA55A, q); scr_writew(0x0000, p);
 224        if (scr_readw(q) == 0xA55A) count++;
 225        
 226        scr_writew(0x5AA5, q); scr_writew(0x0000, p);
 227        if (scr_readw(q) == 0x5AA5) count++;
 228
 229        scr_writew(p_save, p); scr_writew(q_save, q);
 230        
 231        if (count == 4) {
 232                mda_vram_len = 0x02000;
 233        }
 234        
 235        /* Ok, there is definitely a card registering at the correct
 236         * memory location, so now we do an I/O port test.
 237         */
 238
 239#ifdef TEST_MDA_B
 240        /* Edward: These two mess `tests' mess up my cursor on bootup */
 241
 242        /* cursor low register */
 243        if (! test_mda_b(0x66, 0x0f)) {
 244                return 0;
 245        }
 246
 247        /* cursor low register */
 248        if (! test_mda_b(0x99, 0x0f)) {
 249                return 0;
 250        }
 251#endif
 252
 253        /* See if the card is a Hercules, by checking whether the vsync
 254         * bit of the status register is changing.  This test lasts for
 255         * approximately 1/10th of a second.
 256         */
 257        
 258        p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;
 259
 260        for (count=0; count < 50000 && p_save == q_save; count++) {
 261                q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;
 262                udelay(2);
 263        }
 264
 265        if (p_save != q_save) {
 266                switch (inb_p(mda_status_port) & 0x70) {
 267                        case 0x10:
 268                                mda_type = TYPE_HERCPLUS;
 269                                mda_type_name = "HerculesPlus";
 270                                break;
 271                        case 0x50:
 272                                mda_type = TYPE_HERCCOLOR;
 273                                mda_type_name = "HerculesColor";
 274                                break;
 275                        default:
 276                                mda_type = TYPE_HERC;
 277                                mda_type_name = "Hercules";
 278                                break;
 279                }
 280        }
 281
 282        return 1;
 283}
 284
 285static void mda_initialize(void)
 286{
 287        write_mda_b(97, 0x00);          /* horizontal total */
 288        write_mda_b(80, 0x01);          /* horizontal displayed */
 289        write_mda_b(82, 0x02);          /* horizontal sync pos */
 290        write_mda_b(15, 0x03);          /* horizontal sync width */
 291
 292        write_mda_b(25, 0x04);          /* vertical total */
 293        write_mda_b(6,  0x05);          /* vertical total adjust */
 294        write_mda_b(25, 0x06);          /* vertical displayed */
 295        write_mda_b(25, 0x07);          /* vertical sync pos */
 296
 297        write_mda_b(2,  0x08);          /* interlace mode */
 298        write_mda_b(13, 0x09);          /* maximum scanline */
 299        write_mda_b(12, 0x0a);          /* cursor start */
 300        write_mda_b(13, 0x0b);          /* cursor end */
 301
 302        write_mda_w(0x0000, 0x0c);      /* start address */
 303        write_mda_w(0x0000, 0x0e);      /* cursor location */
 304
 305        outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port);
 306        outb_p(0x00, mda_status_port);
 307        outb_p(0x00, mda_gfx_port);
 308}
 309
 310static const char *mdacon_startup(void)
 311{
 312        mda_num_columns = 80;
 313        mda_num_lines   = 25;
 314
 315        mda_vram_len  = 0x01000;
 316        mda_vram_base = VGA_MAP_MEM(0xb0000, mda_vram_len);
 317
 318        mda_index_port  = 0x3b4;
 319        mda_value_port  = 0x3b5;
 320        mda_mode_port   = 0x3b8;
 321        mda_status_port = 0x3ba;
 322        mda_gfx_port    = 0x3bf;
 323
 324        mda_type = TYPE_MDA;
 325        mda_type_name = "MDA";
 326
 327        if (! mda_detect()) {
 328                printk("mdacon: MDA card not detected.\n");
 329                return NULL;
 330        }
 331
 332        if (mda_type != TYPE_MDA) {
 333                mda_initialize();
 334        }
 335
 336        /* cursor looks ugly during boot-up, so turn it off */
 337        mda_set_cursor(mda_vram_len - 1);
 338
 339        printk("mdacon: %s with %ldK of memory detected.\n",
 340                mda_type_name, mda_vram_len/1024);
 341
 342        return "MDA-2";
 343}
 344
 345static void mdacon_init(struct vc_data *c, int init)
 346{
 347        c->vc_complement_mask = 0x0800;  /* reverse video */
 348        c->vc_display_fg = &mda_display_fg;
 349
 350        if (init) {
 351                c->vc_cols = mda_num_columns;
 352                c->vc_rows = mda_num_lines;
 353        } else
 354                vc_resize(c, mda_num_columns, mda_num_lines);
 355
 356        /* make the first MDA console visible */
 357
 358        if (mda_display_fg == NULL)
 359                mda_display_fg = c;
 360}
 361
 362static void mdacon_deinit(struct vc_data *c)
 363{
 364        /* con_set_default_unimap(c->vc_num); */
 365
 366        if (mda_display_fg == c)
 367                mda_display_fg = NULL;
 368}
 369
 370static inline u16 mda_convert_attr(u16 ch)
 371{
 372        u16 attr = 0x0700;
 373
 374        /* Underline and reverse-video are mutually exclusive on MDA.
 375         * Since reverse-video is used for cursors and selected areas,
 376         * it takes precedence. 
 377         */
 378
 379        if (ch & 0x0800)        attr = 0x7000;  /* reverse */
 380        else if (ch & 0x0400)   attr = 0x0100;  /* underline */
 381
 382        return ((ch & 0x0200) << 2) |           /* intensity */ 
 383                (ch & 0x8000) |                 /* blink */ 
 384                (ch & 0x00ff) | attr;
 385}
 386
 387static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity, 
 388                            u8 blink, u8 underline, u8 reverse, u8 italic)
 389{
 390        /* The attribute is just a bit vector:
 391         *
 392         *      Bit 0..1 : intensity (0..2)
 393         *      Bit 2    : underline
 394         *      Bit 3    : reverse
 395         *      Bit 7    : blink
 396         */
 397
 398        return (intensity & 3) |
 399                ((underline & 1) << 2) |
 400                ((reverse   & 1) << 3) |
 401                (!!italic << 4) |
 402                ((blink     & 1) << 7);
 403}
 404
 405static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
 406{
 407        for (; count > 0; count--) {
 408                scr_writew(scr_readw(p) ^ 0x0800, p);
 409                p++;
 410        }
 411}
 412
 413#define MDA_ADDR(x,y)  ((u16 *) mda_vram_base + (y)*mda_num_columns + (x))
 414
 415static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
 416{
 417        scr_writew(mda_convert_attr(ch), MDA_ADDR(x, y));
 418}
 419
 420static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
 421                         int count, int y, int x)
 422{
 423        u16 *dest = MDA_ADDR(x, y);
 424
 425        for (; count > 0; count--) {
 426                scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
 427        }
 428}
 429
 430static void mdacon_clear(struct vc_data *c, int y, int x, 
 431                          int height, int width)
 432{
 433        u16 *dest = MDA_ADDR(x, y);
 434        u16 eattr = mda_convert_attr(c->vc_video_erase_char);
 435
 436        if (width <= 0 || height <= 0)
 437                return;
 438
 439        if (x==0 && width==mda_num_columns) {
 440                scr_memsetw(dest, eattr, height*width*2);
 441        } else {
 442                for (; height > 0; height--, dest+=mda_num_columns)
 443                        scr_memsetw(dest, eattr, width*2);
 444        }
 445}
 446                        
 447static int mdacon_switch(struct vc_data *c)
 448{
 449        return 1;       /* redrawing needed */
 450}
 451
 452static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
 453{
 454        if (mda_type == TYPE_MDA) {
 455                if (blank) 
 456                        scr_memsetw((void *)mda_vram_base, 
 457                                mda_convert_attr(c->vc_video_erase_char),
 458                                c->vc_screenbuf_size);
 459                /* Tell console.c that it has to restore the screen itself */
 460                return 1;
 461        } else {
 462                if (blank)
 463                        outb_p(0x00, mda_mode_port);    /* disable video */
 464                else
 465                        outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, 
 466                                mda_mode_port);
 467                return 0;
 468        }
 469}
 470
 471static void mdacon_cursor(struct vc_data *c, int mode)
 472{
 473        if (mode == CM_ERASE) {
 474                mda_set_cursor(mda_vram_len - 1);
 475                return;
 476        }
 477
 478        mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2);
 479
 480        switch (c->vc_cursor_type & 0x0f) {
 481
 482                case CUR_LOWER_THIRD:   mda_set_cursor_size(10, 13); break;
 483                case CUR_LOWER_HALF:    mda_set_cursor_size(7,  13); break;
 484                case CUR_TWO_THIRDS:    mda_set_cursor_size(4,  13); break;
 485                case CUR_BLOCK:         mda_set_cursor_size(1,  13); break;
 486                case CUR_NONE:          mda_set_cursor_size(14, 13); break;
 487                default:                mda_set_cursor_size(12, 13); break;
 488        }
 489}
 490
 491static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
 492{
 493        u16 eattr = mda_convert_attr(c->vc_video_erase_char);
 494
 495        if (!lines)
 496                return 0;
 497
 498        if (lines > c->vc_rows)   /* maximum realistic size */
 499                lines = c->vc_rows;
 500
 501        switch (dir) {
 502
 503        case SM_UP:
 504                scr_memmovew(MDA_ADDR(0,t), MDA_ADDR(0,t+lines),
 505                                (b-t-lines)*mda_num_columns*2);
 506                scr_memsetw(MDA_ADDR(0,b-lines), eattr,
 507                                lines*mda_num_columns*2);
 508                break;
 509
 510        case SM_DOWN:
 511                scr_memmovew(MDA_ADDR(0,t+lines), MDA_ADDR(0,t),
 512                                (b-t-lines)*mda_num_columns*2);
 513                scr_memsetw(MDA_ADDR(0,t), eattr, lines*mda_num_columns*2);
 514                break;
 515        }
 516
 517        return 0;
 518}
 519
 520
 521/*
 522 *  The console `switch' structure for the MDA based console
 523 */
 524
 525static const struct consw mda_con = {
 526        .owner =                THIS_MODULE,
 527        .con_startup =          mdacon_startup,
 528        .con_init =             mdacon_init,
 529        .con_deinit =           mdacon_deinit,
 530        .con_clear =            mdacon_clear,
 531        .con_putc =             mdacon_putc,
 532        .con_putcs =            mdacon_putcs,
 533        .con_cursor =           mdacon_cursor,
 534        .con_scroll =           mdacon_scroll,
 535        .con_switch =           mdacon_switch,
 536        .con_blank =            mdacon_blank,
 537        .con_build_attr =       mdacon_build_attr,
 538        .con_invert_region =    mdacon_invert_region,
 539};
 540
 541int __init mda_console_init(void)
 542{
 543        int err;
 544
 545        if (mda_first_vc > mda_last_vc)
 546                return 1;
 547        console_lock();
 548        err = do_take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
 549        console_unlock();
 550        return err;
 551}
 552
 553static void __exit mda_console_exit(void)
 554{
 555        give_up_console(&mda_con);
 556}
 557
 558module_init(mda_console_init);
 559module_exit(mda_console_exit);
 560
 561MODULE_LICENSE("GPL");
 562
 563