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/slab.h> 37 #include <linux/vt_kern.h> 38 #include <linux/vt_buffer.h> 39 #include <linux/selection.h> 40 #include <linux/spinlock.h> 41 #include <linux/ioport.h> 42 #include <linux/delay.h> 43 #include <linux/init.h> 44 45 #include <asm/io.h> 46 #include <asm/vga.h> 47 48 static DEFINE_SPINLOCK(mda_lock); 49 50 /* description of the hardware layout */ 51 52 static unsigned long mda_vram_base; /* Base of video memory */ 53 static unsigned long mda_vram_len; /* Size of video memory */ 54 static unsigned int mda_num_columns; /* Number of text columns */ 55 static unsigned int mda_num_lines; /* Number of text lines */ 56 57 static unsigned int mda_index_port; /* Register select port */ 58 static unsigned int mda_value_port; /* Register value port */ 59 static unsigned int mda_mode_port; /* Mode control port */ 60 static unsigned int mda_status_port; /* Status and Config port */ 61 static unsigned int mda_gfx_port; /* Graphics control port */ 62 63 /* current hardware state */ 64 65 static int mda_cursor_loc=-1; 66 static int mda_cursor_size_from=-1; 67 static int mda_cursor_size_to=-1; 68 69 static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type; 70 static char *mda_type_name; 71 72 /* console information */ 73 74 static int mda_first_vc = 1; 75 static int mda_last_vc = 16; 76 77 static struct vc_data *mda_display_fg = NULL; 78 79 module_param(mda_first_vc, int, 0); 80 module_param(mda_last_vc, int, 0); 81 82 /* MDA register values 83 */ 84 85 #define MDA_CURSOR_BLINKING 0x00 86 #define MDA_CURSOR_OFF 0x20 87 #define MDA_CURSOR_SLOWBLINK 0x60 88 89 #define MDA_MODE_GRAPHICS 0x02 90 #define MDA_MODE_VIDEO_EN 0x08 91 #define MDA_MODE_BLINK_EN 0x20 92 #define MDA_MODE_GFX_PAGE1 0x80 93 94 #define MDA_STATUS_HSYNC 0x01 95 #define MDA_STATUS_VSYNC 0x80 96 #define MDA_STATUS_VIDEO 0x08 97 98 #define MDA_CONFIG_COL132 0x08 99 #define MDA_GFX_MODE_EN 0x01 100 #define MDA_GFX_PAGE_EN 0x02 101 102 103 /* 104 * MDA could easily be classified as "pre-dinosaur hardware". 105 */ 106 107 static void write_mda_b(unsigned int val, unsigned char reg) 108 { 109 unsigned long flags; 110 111 spin_lock_irqsave(&mda_lock, flags); 112 113 outb_p(reg, mda_index_port); 114 outb_p(val, mda_value_port); 115 116 spin_unlock_irqrestore(&mda_lock, flags); 117 } 118 119 static void write_mda_w(unsigned int val, unsigned char reg) 120 { 121 unsigned long flags; 122 123 spin_lock_irqsave(&mda_lock, flags); 124 125 outb_p(reg, mda_index_port); outb_p(val >> 8, mda_value_port); 126 outb_p(reg+1, mda_index_port); outb_p(val & 0xff, mda_value_port); 127 128 spin_unlock_irqrestore(&mda_lock, flags); 129 } 130 131 #ifdef TEST_MDA_B 132 static int test_mda_b(unsigned char val, unsigned char reg) 133 { 134 unsigned long flags; 135 136 spin_lock_irqsave(&mda_lock, flags); 137 138 outb_p(reg, mda_index_port); 139 outb (val, mda_value_port); 140 141 udelay(20); val = (inb_p(mda_value_port) == val); 142 143 spin_unlock_irqrestore(&mda_lock, flags); 144 return val; 145 } 146 #endif 147 148 static inline void mda_set_cursor(unsigned int location) 149 { 150 if (mda_cursor_loc == location) 151 return; 152 153 write_mda_w(location >> 1, 0x0e); 154 155 mda_cursor_loc = location; 156 } 157 158 static inline void mda_set_cursor_size(int from, int to) 159 { 160 if (mda_cursor_size_from==from && mda_cursor_size_to==to) 161 return; 162 163 if (from > to) { 164 write_mda_b(MDA_CURSOR_OFF, 0x0a); /* disable cursor */ 165 } else { 166 write_mda_b(from, 0x0a); /* cursor start */ 167 write_mda_b(to, 0x0b); /* cursor end */ 168 } 169 170 mda_cursor_size_from = from; 171 mda_cursor_size_to = to; 172 } 173 174 175 #ifndef MODULE 176 static int __init mdacon_setup(char *str) 177 { 178 /* command line format: mdacon=<first>,<last> */ 179 180 int ints[3]; 181 182 str = get_options(str, ARRAY_SIZE(ints), ints); 183 184 if (ints[0] < 2) 185 return 0; 186 187 if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES || 188 ints[2] < 1 || ints[2] > MAX_NR_CONSOLES) 189 return 0; 190 191 mda_first_vc = ints[1]; 192 mda_last_vc = ints[2]; 193 return 1; 194 } 195 196 __setup("mdacon=", mdacon_setup); 197 #endif 198 199 static int mda_detect(void) 200 { 201 int count=0; 202 u16 *p, p_save; 203 u16 *q, q_save; 204 205 /* do a memory check */ 206 207 p = (u16 *) mda_vram_base; 208 q = (u16 *) (mda_vram_base + 0x01000); 209 210 p_save = scr_readw(p); q_save = scr_readw(q); 211 212 scr_writew(0xAA55, p); if (scr_readw(p) == 0xAA55) count++; 213 scr_writew(0x55AA, p); if (scr_readw(p) == 0x55AA) count++; 214 scr_writew(p_save, p); 215 216 if (count != 2) { 217 return 0; 218 } 219 220 /* check if we have 4K or 8K */ 221 222 scr_writew(0xA55A, q); scr_writew(0x0000, p); 223 if (scr_readw(q) == 0xA55A) count++; 224 225 scr_writew(0x5AA5, q); scr_writew(0x0000, p); 226 if (scr_readw(q) == 0x5AA5) count++; 227 228 scr_writew(p_save, p); scr_writew(q_save, q); 229 230 if (count == 4) { 231 mda_vram_len = 0x02000; 232 } 233 234 /* Ok, there is definitely a card registering at the correct 235 * memory location, so now we do an I/O port test. 236 */ 237 238 #ifdef TEST_MDA_B 239 /* Edward: These two mess `tests' mess up my cursor on bootup */ 240 241 /* cursor low register */ 242 if (! test_mda_b(0x66, 0x0f)) { 243 return 0; 244 } 245 246 /* cursor low register */ 247 if (! test_mda_b(0x99, 0x0f)) { 248 return 0; 249 } 250 #endif 251 252 /* See if the card is a Hercules, by checking whether the vsync 253 * bit of the status register is changing. This test lasts for 254 * approximately 1/10th of a second. 255 */ 256 257 p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC; 258 259 for (count=0; count < 50000 && p_save == q_save; count++) { 260 q_save = inb(mda_status_port) & MDA_STATUS_VSYNC; 261 udelay(2); 262 } 263 264 if (p_save != q_save) { 265 switch (inb_p(mda_status_port) & 0x70) { 266 case 0x10: 267 mda_type = TYPE_HERCPLUS; 268 mda_type_name = "HerculesPlus"; 269 break; 270 case 0x50: 271 mda_type = TYPE_HERCCOLOR; 272 mda_type_name = "HerculesColor"; 273 break; 274 default: 275 mda_type = TYPE_HERC; 276 mda_type_name = "Hercules"; 277 break; 278 } 279 } 280 281 return 1; 282 } 283 284 static void mda_initialize(void) 285 { 286 write_mda_b(97, 0x00); /* horizontal total */ 287 write_mda_b(80, 0x01); /* horizontal displayed */ 288 write_mda_b(82, 0x02); /* horizontal sync pos */ 289 write_mda_b(15, 0x03); /* horizontal sync width */ 290 291 write_mda_b(25, 0x04); /* vertical total */ 292 write_mda_b(6, 0x05); /* vertical total adjust */ 293 write_mda_b(25, 0x06); /* vertical displayed */ 294 write_mda_b(25, 0x07); /* vertical sync pos */ 295 296 write_mda_b(2, 0x08); /* interlace mode */ 297 write_mda_b(13, 0x09); /* maximum scanline */ 298 write_mda_b(12, 0x0a); /* cursor start */ 299 write_mda_b(13, 0x0b); /* cursor end */ 300 301 write_mda_w(0x0000, 0x0c); /* start address */ 302 write_mda_w(0x0000, 0x0e); /* cursor location */ 303 304 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port); 305 outb_p(0x00, mda_status_port); 306 outb_p(0x00, mda_gfx_port); 307 } 308 309 static const char *mdacon_startup(void) 310 { 311 mda_num_columns = 80; 312 mda_num_lines = 25; 313 314 mda_vram_len = 0x01000; 315 mda_vram_base = VGA_MAP_MEM(0xb0000, mda_vram_len); 316 317 mda_index_port = 0x3b4; 318 mda_value_port = 0x3b5; 319 mda_mode_port = 0x3b8; 320 mda_status_port = 0x3ba; 321 mda_gfx_port = 0x3bf; 322 323 mda_type = TYPE_MDA; 324 mda_type_name = "MDA"; 325 326 if (! mda_detect()) { 327 printk("mdacon: MDA card not detected.\n"); 328 return NULL; 329 } 330 331 if (mda_type != TYPE_MDA) { 332 mda_initialize(); 333 } 334 335 /* cursor looks ugly during boot-up, so turn it off */ 336 mda_set_cursor(mda_vram_len - 1); 337 338 printk("mdacon: %s with %ldK of memory detected.\n", 339 mda_type_name, mda_vram_len/1024); 340 341 return "MDA-2"; 342 } 343 344 static void mdacon_init(struct vc_data *c, int init) 345 { 346 c->vc_complement_mask = 0x0800; /* reverse video */ 347 c->vc_display_fg = &mda_display_fg; 348 349 if (init) { 350 c->vc_cols = mda_num_columns; 351 c->vc_rows = mda_num_lines; 352 } else 353 vc_resize(c, mda_num_columns, mda_num_lines); 354 355 /* make the first MDA console visible */ 356 357 if (mda_display_fg == NULL) 358 mda_display_fg = c; 359 } 360 361 static void mdacon_deinit(struct vc_data *c) 362 { 363 /* con_set_default_unimap(c->vc_num); */ 364 365 if (mda_display_fg == c) 366 mda_display_fg = NULL; 367 } 368 369 static inline u16 mda_convert_attr(u16 ch) 370 { 371 u16 attr = 0x0700; 372 373 /* Underline and reverse-video are mutually exclusive on MDA. 374 * Since reverse-video is used for cursors and selected areas, 375 * it takes precedence. 376 */ 377 378 if (ch & 0x0800) attr = 0x7000; /* reverse */ 379 else if (ch & 0x0400) attr = 0x0100; /* underline */ 380 381 return ((ch & 0x0200) << 2) | /* intensity */ 382 (ch & 0x8000) | /* blink */ 383 (ch & 0x00ff) | attr; 384 } 385 386 static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity, 387 u8 blink, u8 underline, u8 reverse, u8 italic) 388 { 389 /* The attribute is just a bit vector: 390 * 391 * Bit 0..1 : intensity (0..2) 392 * Bit 2 : underline 393 * Bit 3 : reverse 394 * Bit 7 : blink 395 */ 396 397 return (intensity & 3) | 398 ((underline & 1) << 2) | 399 ((reverse & 1) << 3) | 400 (!!italic << 4) | 401 ((blink & 1) << 7); 402 } 403 404 static void mdacon_invert_region(struct vc_data *c, u16 *p, int count) 405 { 406 for (; count > 0; count--) { 407 scr_writew(scr_readw(p) ^ 0x0800, p); 408 p++; 409 } 410 } 411 412 #define MDA_ADDR(x,y) ((u16 *) mda_vram_base + (y)*mda_num_columns + (x)) 413 414 static void mdacon_putc(struct vc_data *c, int ch, int y, int x) 415 { 416 scr_writew(mda_convert_attr(ch), MDA_ADDR(x, y)); 417 } 418 419 static void mdacon_putcs(struct vc_data *c, const unsigned short *s, 420 int count, int y, int x) 421 { 422 u16 *dest = MDA_ADDR(x, y); 423 424 for (; count > 0; count--) { 425 scr_writew(mda_convert_attr(scr_readw(s++)), dest++); 426 } 427 } 428 429 static void mdacon_clear(struct vc_data *c, int y, int x, 430 int height, int width) 431 { 432 u16 *dest = MDA_ADDR(x, y); 433 u16 eattr = mda_convert_attr(c->vc_video_erase_char); 434 435 if (width <= 0 || height <= 0) 436 return; 437 438 if (x==0 && width==mda_num_columns) { 439 scr_memsetw(dest, eattr, height*width*2); 440 } else { 441 for (; height > 0; height--, dest+=mda_num_columns) 442 scr_memsetw(dest, eattr, width*2); 443 } 444 } 445 446 static void mdacon_bmove(struct vc_data *c, int sy, int sx, 447 int dy, int dx, int height, int width) 448 { 449 u16 *src, *dest; 450 451 if (width <= 0 || height <= 0) 452 return; 453 454 if (sx==0 && dx==0 && width==mda_num_columns) { 455 scr_memmovew(MDA_ADDR(0,dy), MDA_ADDR(0,sy), height*width*2); 456 457 } else if (dy < sy || (dy == sy && dx < sx)) { 458 src = MDA_ADDR(sx, sy); 459 dest = MDA_ADDR(dx, dy); 460 461 for (; height > 0; height--) { 462 scr_memmovew(dest, src, width*2); 463 src += mda_num_columns; 464 dest += mda_num_columns; 465 } 466 } else { 467 src = MDA_ADDR(sx, sy+height-1); 468 dest = MDA_ADDR(dx, dy+height-1); 469 470 for (; height > 0; height--) { 471 scr_memmovew(dest, src, width*2); 472 src -= mda_num_columns; 473 dest -= mda_num_columns; 474 } 475 } 476 } 477 478 static int mdacon_switch(struct vc_data *c) 479 { 480 return 1; /* redrawing needed */ 481 } 482 483 static int mdacon_set_palette(struct vc_data *c, unsigned char *table) 484 { 485 return -EINVAL; 486 } 487 488 static int mdacon_blank(struct vc_data *c, int blank, int mode_switch) 489 { 490 if (mda_type == TYPE_MDA) { 491 if (blank) 492 scr_memsetw((void *)mda_vram_base, 493 mda_convert_attr(c->vc_video_erase_char), 494 c->vc_screenbuf_size); 495 /* Tell console.c that it has to restore the screen itself */ 496 return 1; 497 } else { 498 if (blank) 499 outb_p(0x00, mda_mode_port); /* disable video */ 500 else 501 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, 502 mda_mode_port); 503 return 0; 504 } 505 } 506 507 static int mdacon_scrolldelta(struct vc_data *c, int lines) 508 { 509 return 0; 510 } 511 512 static void mdacon_cursor(struct vc_data *c, int mode) 513 { 514 if (mode == CM_ERASE) { 515 mda_set_cursor(mda_vram_len - 1); 516 return; 517 } 518 519 mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2); 520 521 switch (c->vc_cursor_type & 0x0f) { 522 523 case CUR_LOWER_THIRD: mda_set_cursor_size(10, 13); break; 524 case CUR_LOWER_HALF: mda_set_cursor_size(7, 13); break; 525 case CUR_TWO_THIRDS: mda_set_cursor_size(4, 13); break; 526 case CUR_BLOCK: mda_set_cursor_size(1, 13); break; 527 case CUR_NONE: mda_set_cursor_size(14, 13); break; 528 default: mda_set_cursor_size(12, 13); break; 529 } 530 } 531 532 static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines) 533 { 534 u16 eattr = mda_convert_attr(c->vc_video_erase_char); 535 536 if (!lines) 537 return 0; 538 539 if (lines > c->vc_rows) /* maximum realistic size */ 540 lines = c->vc_rows; 541 542 switch (dir) { 543 544 case SM_UP: 545 scr_memmovew(MDA_ADDR(0,t), MDA_ADDR(0,t+lines), 546 (b-t-lines)*mda_num_columns*2); 547 scr_memsetw(MDA_ADDR(0,b-lines), eattr, 548 lines*mda_num_columns*2); 549 break; 550 551 case SM_DOWN: 552 scr_memmovew(MDA_ADDR(0,t+lines), MDA_ADDR(0,t), 553 (b-t-lines)*mda_num_columns*2); 554 scr_memsetw(MDA_ADDR(0,t), eattr, lines*mda_num_columns*2); 555 break; 556 } 557 558 return 0; 559 } 560 561 562 /* 563 * The console `switch' structure for the MDA based console 564 */ 565 566 static const struct consw mda_con = { 567 .owner = THIS_MODULE, 568 .con_startup = mdacon_startup, 569 .con_init = mdacon_init, 570 .con_deinit = mdacon_deinit, 571 .con_clear = mdacon_clear, 572 .con_putc = mdacon_putc, 573 .con_putcs = mdacon_putcs, 574 .con_cursor = mdacon_cursor, 575 .con_scroll = mdacon_scroll, 576 .con_bmove = mdacon_bmove, 577 .con_switch = mdacon_switch, 578 .con_blank = mdacon_blank, 579 .con_set_palette = mdacon_set_palette, 580 .con_scrolldelta = mdacon_scrolldelta, 581 .con_build_attr = mdacon_build_attr, 582 .con_invert_region = mdacon_invert_region, 583 }; 584 585 int __init mda_console_init(void) 586 { 587 if (mda_first_vc > mda_last_vc) 588 return 1; 589 590 return take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0); 591 } 592 593 static void __exit mda_console_exit(void) 594 { 595 give_up_console(&mda_con); 596 } 597 598 module_init(mda_console_init); 599 module_exit(mda_console_exit); 600 601 MODULE_LICENSE("GPL"); 602 603