drivers/video/console/mdacon.c

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This source file includes following definitions.
write_mda_b
write_mda_w
test_mda_b
mda_set_cursor
mda_set_cursor_size
mdacon_setup
mda_detect
mda_initialize
mdacon_startup
mdacon_init
mdacon_deinit
mda_convert_attr
mdacon_build_attr
mdacon_invert_region
mda_addr
mdacon_putc
mdacon_putcs
mdacon_clear
mdacon_switch
mdacon_blank
mdacon_cursor
mdacon_scroll
mda_console_init
mda_console_exit
   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 
  47 static DEFINE_SPINLOCK(mda_lock);
  48 
  49 /* description of the hardware layout */
  50 
  51 static u16              *mda_vram_base;         /* Base of video memory */
  52 static unsigned long    mda_vram_len;           /* Size of video memory */
  53 static unsigned int     mda_num_columns;        /* Number of text columns */
  54 static unsigned int     mda_num_lines;          /* Number of text lines */
  55 
  56 static unsigned int     mda_index_port;         /* Register select port */
  57 static unsigned int     mda_value_port;         /* Register value port */
  58 static unsigned int     mda_mode_port;          /* Mode control port */
  59 static unsigned int     mda_status_port;        /* Status and Config port */
  60 static unsigned int     mda_gfx_port;           /* Graphics control port */
  61 
  62 /* current hardware state */
  63 
  64 static int      mda_cursor_loc=-1;
  65 static int      mda_cursor_size_from=-1;
  66 static int      mda_cursor_size_to=-1;
  67 
  68 static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;
  69 static char *mda_type_name;
  70 
  71 /* console information */
  72 
  73 static int      mda_first_vc = 13;
  74 static int      mda_last_vc  = 16;
  75 
  76 static struct vc_data   *mda_display_fg = NULL;
  77 
  78 module_param(mda_first_vc, int, 0);
  79 MODULE_PARM_DESC(mda_first_vc, "First virtual console. Default: 13");
  80 module_param(mda_last_vc, int, 0);
  81 MODULE_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 
 108 static 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 
 120 static 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
 133 static 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 
 149 static 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 
 159 static 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
 177 static 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 
 200 static 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 = mda_vram_base;
 209         q = mda_vram_base + 0x01000 / 2;
 210 
 211         p_save = scr_readw(p);
 212         q_save = scr_readw(q);
 213 
 214         scr_writew(0xAA55, p);
 215         if (scr_readw(p) == 0xAA55)
 216                 count++;
 217 
 218         scr_writew(0x55AA, p);
 219         if (scr_readw(p) == 0x55AA)
 220                 count++;
 221 
 222         scr_writew(p_save, p);
 223 
 224         if (count != 2) {
 225                 return 0;
 226         }
 227 
 228         /* check if we have 4K or 8K */
 229 
 230         scr_writew(0xA55A, q);
 231         scr_writew(0x0000, p);
 232         if (scr_readw(q) == 0xA55A)
 233                 count++;
 234         
 235         scr_writew(0x5AA5, q);
 236         scr_writew(0x0000, p);
 237         if (scr_readw(q) == 0x5AA5)
 238                 count++;
 239 
 240         scr_writew(p_save, p);
 241         scr_writew(q_save, q);
 242         
 243         if (count == 4) {
 244                 mda_vram_len = 0x02000;
 245         }
 246         
 247         /* Ok, there is definitely a card registering at the correct
 248          * memory location, so now we do an I/O port test.
 249          */
 250 
 251 #ifdef TEST_MDA_B
 252         /* Edward: These two mess `tests' mess up my cursor on bootup */
 253 
 254         /* cursor low register */
 255         if (!test_mda_b(0x66, 0x0f))
 256                 return 0;
 257 
 258         /* cursor low register */
 259         if (!test_mda_b(0x99, 0x0f))
 260                 return 0;
 261 #endif
 262 
 263         /* See if the card is a Hercules, by checking whether the vsync
 264          * bit of the status register is changing.  This test lasts for
 265          * approximately 1/10th of a second.
 266          */
 267         
 268         p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;
 269 
 270         for (count = 0; count < 50000 && p_save == q_save; count++) {
 271                 q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;
 272                 udelay(2);
 273         }
 274 
 275         if (p_save != q_save) {
 276                 switch (inb_p(mda_status_port) & 0x70) {
 277                 case 0x10:
 278                         mda_type = TYPE_HERCPLUS;
 279                         mda_type_name = "HerculesPlus";
 280                         break;
 281                 case 0x50:
 282                         mda_type = TYPE_HERCCOLOR;
 283                         mda_type_name = "HerculesColor";
 284                         break;
 285                 default:
 286                         mda_type = TYPE_HERC;
 287                         mda_type_name = "Hercules";
 288                         break;
 289                 }
 290         }
 291 
 292         return 1;
 293 }
 294 
 295 static void mda_initialize(void)
 296 {
 297         write_mda_b(97, 0x00);          /* horizontal total */
 298         write_mda_b(80, 0x01);          /* horizontal displayed */
 299         write_mda_b(82, 0x02);          /* horizontal sync pos */
 300         write_mda_b(15, 0x03);          /* horizontal sync width */
 301 
 302         write_mda_b(25, 0x04);          /* vertical total */
 303         write_mda_b(6,  0x05);          /* vertical total adjust */
 304         write_mda_b(25, 0x06);          /* vertical displayed */
 305         write_mda_b(25, 0x07);          /* vertical sync pos */
 306 
 307         write_mda_b(2,  0x08);          /* interlace mode */
 308         write_mda_b(13, 0x09);          /* maximum scanline */
 309         write_mda_b(12, 0x0a);          /* cursor start */
 310         write_mda_b(13, 0x0b);          /* cursor end */
 311 
 312         write_mda_w(0x0000, 0x0c);      /* start address */
 313         write_mda_w(0x0000, 0x0e);      /* cursor location */
 314 
 315         outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port);
 316         outb_p(0x00, mda_status_port);
 317         outb_p(0x00, mda_gfx_port);
 318 }
 319 
 320 static const char *mdacon_startup(void)
 321 {
 322         mda_num_columns = 80;
 323         mda_num_lines   = 25;
 324 
 325         mda_vram_len  = 0x01000;
 326         mda_vram_base = (u16 *)VGA_MAP_MEM(0xb0000, mda_vram_len);
 327 
 328         mda_index_port  = 0x3b4;
 329         mda_value_port  = 0x3b5;
 330         mda_mode_port   = 0x3b8;
 331         mda_status_port = 0x3ba;
 332         mda_gfx_port    = 0x3bf;
 333 
 334         mda_type = TYPE_MDA;
 335         mda_type_name = "MDA";
 336 
 337         if (! mda_detect()) {
 338                 printk("mdacon: MDA card not detected.\n");
 339                 return NULL;
 340         }
 341 
 342         if (mda_type != TYPE_MDA) {
 343                 mda_initialize();
 344         }
 345 
 346         /* cursor looks ugly during boot-up, so turn it off */
 347         mda_set_cursor(mda_vram_len - 1);
 348 
 349         printk("mdacon: %s with %ldK of memory detected.\n",
 350                 mda_type_name, mda_vram_len/1024);
 351 
 352         return "MDA-2";
 353 }
 354 
 355 static void mdacon_init(struct vc_data *c, int init)
 356 {
 357         c->vc_complement_mask = 0x0800;  /* reverse video */
 358         c->vc_display_fg = &mda_display_fg;
 359 
 360         if (init) {
 361                 c->vc_cols = mda_num_columns;
 362                 c->vc_rows = mda_num_lines;
 363         } else
 364                 vc_resize(c, mda_num_columns, mda_num_lines);
 365 
 366         /* make the first MDA console visible */
 367 
 368         if (mda_display_fg == NULL)
 369                 mda_display_fg = c;
 370 }
 371 
 372 static void mdacon_deinit(struct vc_data *c)
 373 {
 374         /* con_set_default_unimap(c->vc_num); */
 375 
 376         if (mda_display_fg == c)
 377                 mda_display_fg = NULL;
 378 }
 379 
 380 static inline u16 mda_convert_attr(u16 ch)
 381 {
 382         u16 attr = 0x0700;
 383 
 384         /* Underline and reverse-video are mutually exclusive on MDA.
 385          * Since reverse-video is used for cursors and selected areas,
 386          * it takes precedence. 
 387          */
 388 
 389         if (ch & 0x0800)        attr = 0x7000;  /* reverse */
 390         else if (ch & 0x0400)   attr = 0x0100;  /* underline */
 391 
 392         return ((ch & 0x0200) << 2) |           /* intensity */ 
 393                 (ch & 0x8000) |                 /* blink */ 
 394                 (ch & 0x00ff) | attr;
 395 }
 396 
 397 static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity, 
 398                             u8 blink, u8 underline, u8 reverse, u8 italic)
 399 {
 400         /* The attribute is just a bit vector:
 401          *
 402          *      Bit 0..1 : intensity (0..2)
 403          *      Bit 2    : underline
 404          *      Bit 3    : reverse
 405          *      Bit 7    : blink
 406          */
 407 
 408         return (intensity & 3) |
 409                 ((underline & 1) << 2) |
 410                 ((reverse   & 1) << 3) |
 411                 (!!italic << 4) |
 412                 ((blink     & 1) << 7);
 413 }
 414 
 415 static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
 416 {
 417         for (; count > 0; count--) {
 418                 scr_writew(scr_readw(p) ^ 0x0800, p);
 419                 p++;
 420         }
 421 }
 422 
 423 static inline u16 *mda_addr(unsigned int x, unsigned int y)
 424 {
 425         return mda_vram_base + y * mda_num_columns + x;
 426 }
 427 
 428 static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
 429 {
 430         scr_writew(mda_convert_attr(ch), mda_addr(x, y));
 431 }
 432 
 433 static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
 434                          int count, int y, int x)
 435 {
 436         u16 *dest = mda_addr(x, y);
 437 
 438         for (; count > 0; count--) {
 439                 scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
 440         }
 441 }
 442 
 443 static void mdacon_clear(struct vc_data *c, int y, int x, 
 444                           int height, int width)
 445 {
 446         u16 *dest = mda_addr(x, y);
 447         u16 eattr = mda_convert_attr(c->vc_video_erase_char);
 448 
 449         if (width <= 0 || height <= 0)
 450                 return;
 451 
 452         if (x==0 && width==mda_num_columns) {
 453                 scr_memsetw(dest, eattr, height*width*2);
 454         } else {
 455                 for (; height > 0; height--, dest+=mda_num_columns)
 456                         scr_memsetw(dest, eattr, width*2);
 457         }
 458 }
 459                         
 460 static int mdacon_switch(struct vc_data *c)
 461 {
 462         return 1;       /* redrawing needed */
 463 }
 464 
 465 static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
 466 {
 467         if (mda_type == TYPE_MDA) {
 468                 if (blank) 
 469                         scr_memsetw(mda_vram_base,
 470                                 mda_convert_attr(c->vc_video_erase_char),
 471                                 c->vc_screenbuf_size);
 472                 /* Tell console.c that it has to restore the screen itself */
 473                 return 1;
 474         } else {
 475                 if (blank)
 476                         outb_p(0x00, mda_mode_port);    /* disable video */
 477                 else
 478                         outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, 
 479                                 mda_mode_port);
 480                 return 0;
 481         }
 482 }
 483 
 484 static void mdacon_cursor(struct vc_data *c, int mode)
 485 {
 486         if (mode == CM_ERASE) {
 487                 mda_set_cursor(mda_vram_len - 1);
 488                 return;
 489         }
 490 
 491         mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2);
 492 
 493         switch (c->vc_cursor_type & 0x0f) {
 494 
 495                 case CUR_LOWER_THIRD:   mda_set_cursor_size(10, 13); break;
 496                 case CUR_LOWER_HALF:    mda_set_cursor_size(7,  13); break;
 497                 case CUR_TWO_THIRDS:    mda_set_cursor_size(4,  13); break;
 498                 case CUR_BLOCK:         mda_set_cursor_size(1,  13); break;
 499                 case CUR_NONE:          mda_set_cursor_size(14, 13); break;
 500                 default:                mda_set_cursor_size(12, 13); break;
 501         }
 502 }
 503 
 504 static bool mdacon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
 505                 enum con_scroll dir, unsigned int lines)
 506 {
 507         u16 eattr = mda_convert_attr(c->vc_video_erase_char);
 508 
 509         if (!lines)
 510                 return false;
 511 
 512         if (lines > c->vc_rows)   /* maximum realistic size */
 513                 lines = c->vc_rows;
 514 
 515         switch (dir) {
 516 
 517         case SM_UP:
 518                 scr_memmovew(mda_addr(0, t), mda_addr(0, t + lines),
 519                                 (b-t-lines)*mda_num_columns*2);
 520                 scr_memsetw(mda_addr(0, b - lines), eattr,
 521                                 lines*mda_num_columns*2);
 522                 break;
 523 
 524         case SM_DOWN:
 525                 scr_memmovew(mda_addr(0, t + lines), mda_addr(0, t),
 526                                 (b-t-lines)*mda_num_columns*2);
 527                 scr_memsetw(mda_addr(0, t), eattr, lines*mda_num_columns*2);
 528                 break;
 529         }
 530 
 531         return false;
 532 }
 533 
 534 
 535 /*
 536  *  The console `switch' structure for the MDA based console
 537  */
 538 
 539 static const struct consw mda_con = {
 540         .owner =                THIS_MODULE,
 541         .con_startup =          mdacon_startup,
 542         .con_init =             mdacon_init,
 543         .con_deinit =           mdacon_deinit,
 544         .con_clear =            mdacon_clear,
 545         .con_putc =             mdacon_putc,
 546         .con_putcs =            mdacon_putcs,
 547         .con_cursor =           mdacon_cursor,
 548         .con_scroll =           mdacon_scroll,
 549         .con_switch =           mdacon_switch,
 550         .con_blank =            mdacon_blank,
 551         .con_build_attr =       mdacon_build_attr,
 552         .con_invert_region =    mdacon_invert_region,
 553 };
 554 
 555 int __init mda_console_init(void)
 556 {
 557         int err;
 558 
 559         if (mda_first_vc > mda_last_vc)
 560                 return 1;
 561         console_lock();
 562         err = do_take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
 563         console_unlock();
 564         return err;
 565 }
 566 
 567 static void __exit mda_console_exit(void)
 568 {
 569         give_up_console(&mda_con);
 570 }
 571 
 572 module_init(mda_console_init);
 573 module_exit(mda_console_exit);
 574 
 575 MODULE_LICENSE("GPL");
 576
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/video/console/mdacon.c

DEFINITIONS
