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/sched.h> 31 #include <linux/fs.h> 32 #include <linux/kernel.h> 33 #include <linux/module.h> 34 #include <linux/tty.h> 35 #include <linux/console.h> 36 #include <linux/string.h> 37 #include <linux/kd.h> 38 #include <linux/slab.h> 39 #include <linux/vt_kern.h> 40 #include <linux/vt_buffer.h> 41 #include <linux/selection.h> 42 #include <linux/spinlock.h> 43 #include <linux/ioport.h> 44 #include <linux/delay.h> 45 #include <linux/init.h> 46 47 #include <asm/io.h> 48 #include <asm/vga.h> 49 50 static DEFINE_SPINLOCK(mda_lock); 51 52 /* description of the hardware layout */ 53 54 static unsigned long mda_vram_base; /* Base of video memory */ 55 static unsigned long mda_vram_len; /* Size of video memory */ 56 static unsigned int mda_num_columns; /* Number of text columns */ 57 static unsigned int mda_num_lines; /* Number of text lines */ 58 59 static unsigned int mda_index_port; /* Register select port */ 60 static unsigned int mda_value_port; /* Register value port */ 61 static unsigned int mda_mode_port; /* Mode control port */ 62 static unsigned int mda_status_port; /* Status and Config port */ 63 static unsigned int mda_gfx_port; /* Graphics control port */ 64 65 /* current hardware state */ 66 67 static int mda_cursor_loc=-1; 68 static int mda_cursor_size_from=-1; 69 static int mda_cursor_size_to=-1; 70 71 static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type; 72 static char *mda_type_name; 73 74 /* console information */ 75 76 static int mda_first_vc = 1; 77 static int mda_last_vc = 16; 78 79 static struct vc_data *mda_display_fg = NULL; 80 81 module_param(mda_first_vc, int, 0); 82 module_param(mda_last_vc, int, 0); 83 84 /* MDA register values 85 */ 86 87 #define MDA_CURSOR_BLINKING 0x00 88 #define MDA_CURSOR_OFF 0x20 89 #define MDA_CURSOR_SLOWBLINK 0x60 90 91 #define MDA_MODE_GRAPHICS 0x02 92 #define MDA_MODE_VIDEO_EN 0x08 93 #define MDA_MODE_BLINK_EN 0x20 94 #define MDA_MODE_GFX_PAGE1 0x80 95 96 #define MDA_STATUS_HSYNC 0x01 97 #define MDA_STATUS_VSYNC 0x80 98 #define MDA_STATUS_VIDEO 0x08 99 100 #define MDA_CONFIG_COL132 0x08 101 #define MDA_GFX_MODE_EN 0x01 102 #define MDA_GFX_PAGE_EN 0x02 103 104 105 /* 106 * MDA could easily be classified as "pre-dinosaur hardware". 107 */ 108 109 static void write_mda_b(unsigned int val, unsigned char reg) 110 { 111 unsigned long flags; 112 113 spin_lock_irqsave(&mda_lock, flags); 114 115 outb_p(reg, mda_index_port); 116 outb_p(val, mda_value_port); 117 118 spin_unlock_irqrestore(&mda_lock, flags); 119 } 120 121 static void write_mda_w(unsigned int val, unsigned char reg) 122 { 123 unsigned long flags; 124 125 spin_lock_irqsave(&mda_lock, flags); 126 127 outb_p(reg, mda_index_port); outb_p(val >> 8, mda_value_port); 128 outb_p(reg+1, mda_index_port); outb_p(val & 0xff, mda_value_port); 129 130 spin_unlock_irqrestore(&mda_lock, flags); 131 } 132 133 #ifdef TEST_MDA_B 134 static int test_mda_b(unsigned char val, unsigned char reg) 135 { 136 unsigned long flags; 137 138 spin_lock_irqsave(&mda_lock, flags); 139 140 outb_p(reg, mda_index_port); 141 outb (val, mda_value_port); 142 143 udelay(20); val = (inb_p(mda_value_port) == val); 144 145 spin_unlock_irqrestore(&mda_lock, flags); 146 return val; 147 } 148 #endif 149 150 static inline void mda_set_cursor(unsigned int location) 151 { 152 if (mda_cursor_loc == location) 153 return; 154 155 write_mda_w(location >> 1, 0x0e); 156 157 mda_cursor_loc = location; 158 } 159 160 static inline void mda_set_cursor_size(int from, int to) 161 { 162 if (mda_cursor_size_from==from && mda_cursor_size_to==to) 163 return; 164 165 if (from > to) { 166 write_mda_b(MDA_CURSOR_OFF, 0x0a); /* disable cursor */ 167 } else { 168 write_mda_b(from, 0x0a); /* cursor start */ 169 write_mda_b(to, 0x0b); /* cursor end */ 170 } 171 172 mda_cursor_size_from = from; 173 mda_cursor_size_to = to; 174 } 175 176 177 #ifndef MODULE 178 static int __init mdacon_setup(char *str) 179 { 180 /* command line format: mdacon=<first>,<last> */ 181 182 int ints[3]; 183 184 str = get_options(str, ARRAY_SIZE(ints), ints); 185 186 if (ints[0] < 2) 187 return 0; 188 189 if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES || 190 ints[2] < 1 || ints[2] > MAX_NR_CONSOLES) 191 return 0; 192 193 mda_first_vc = ints[1]; 194 mda_last_vc = ints[2]; 195 return 1; 196 } 197 198 __setup("mdacon=", mdacon_setup); 199 #endif 200 201 static int __init mda_detect(void) 202 { 203 int count=0; 204 u16 *p, p_save; 205 u16 *q, q_save; 206 207 /* do a memory check */ 208 209 p = (u16 *) mda_vram_base; 210 q = (u16 *) (mda_vram_base + 0x01000); 211 212 p_save = scr_readw(p); q_save = scr_readw(q); 213 214 scr_writew(0xAA55, p); if (scr_readw(p) == 0xAA55) count++; 215 scr_writew(0x55AA, p); if (scr_readw(p) == 0x55AA) count++; 216 scr_writew(p_save, p); 217 218 if (count != 2) { 219 return 0; 220 } 221 222 /* check if we have 4K or 8K */ 223 224 scr_writew(0xA55A, q); scr_writew(0x0000, p); 225 if (scr_readw(q) == 0xA55A) count++; 226 227 scr_writew(0x5AA5, q); scr_writew(0x0000, p); 228 if (scr_readw(q) == 0x5AA5) count++; 229 230 scr_writew(p_save, p); scr_writew(q_save, q); 231 232 if (count == 4) { 233 mda_vram_len = 0x02000; 234 } 235 236 /* Ok, there is definitely a card registering at the correct 237 * memory location, so now we do an I/O port test. 238 */ 239 240 #ifdef TEST_MDA_B 241 /* Edward: These two mess `tests' mess up my cursor on bootup */ 242 243 /* cursor low register */ 244 if (! test_mda_b(0x66, 0x0f)) { 245 return 0; 246 } 247 248 /* cursor low register */ 249 if (! test_mda_b(0x99, 0x0f)) { 250 return 0; 251 } 252 #endif 253 254 /* See if the card is a Hercules, by checking whether the vsync 255 * bit of the status register is changing. This test lasts for 256 * approximately 1/10th of a second. 257 */ 258 259 p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC; 260 261 for (count=0; count < 50000 && p_save == q_save; count++) { 262 q_save = inb(mda_status_port) & MDA_STATUS_VSYNC; 263 udelay(2); 264 } 265 266 if (p_save != q_save) { 267 switch (inb_p(mda_status_port) & 0x70) { 268 case 0x10: 269 mda_type = TYPE_HERCPLUS; 270 mda_type_name = "HerculesPlus"; 271 break; 272 case 0x50: 273 mda_type = TYPE_HERCCOLOR; 274 mda_type_name = "HerculesColor"; 275 break; 276 default: 277 mda_type = TYPE_HERC; 278 mda_type_name = "Hercules"; 279 break; 280 } 281 } 282 283 return 1; 284 } 285 286 static void __init mda_initialize(void) 287 { 288 write_mda_b(97, 0x00); /* horizontal total */ 289 write_mda_b(80, 0x01); /* horizontal displayed */ 290 write_mda_b(82, 0x02); /* horizontal sync pos */ 291 write_mda_b(15, 0x03); /* horizontal sync width */ 292 293 write_mda_b(25, 0x04); /* vertical total */ 294 write_mda_b(6, 0x05); /* vertical total adjust */ 295 write_mda_b(25, 0x06); /* vertical displayed */ 296 write_mda_b(25, 0x07); /* vertical sync pos */ 297 298 write_mda_b(2, 0x08); /* interlace mode */ 299 write_mda_b(13, 0x09); /* maximum scanline */ 300 write_mda_b(12, 0x0a); /* cursor start */ 301 write_mda_b(13, 0x0b); /* cursor end */ 302 303 write_mda_w(0x0000, 0x0c); /* start address */ 304 write_mda_w(0x0000, 0x0e); /* cursor location */ 305 306 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port); 307 outb_p(0x00, mda_status_port); 308 outb_p(0x00, mda_gfx_port); 309 } 310 311 static const char __init *mdacon_startup(void) 312 { 313 mda_num_columns = 80; 314 mda_num_lines = 25; 315 316 mda_vram_base = VGA_MAP_MEM(0xb0000); 317 mda_vram_len = 0x01000; 318 319 mda_index_port = 0x3b4; 320 mda_value_port = 0x3b5; 321 mda_mode_port = 0x3b8; 322 mda_status_port = 0x3ba; 323 mda_gfx_port = 0x3bf; 324 325 mda_type = TYPE_MDA; 326 mda_type_name = "MDA"; 327 328 if (! mda_detect()) { 329 printk("mdacon: MDA card not detected.\n"); 330 return NULL; 331 } 332 333 if (mda_type != TYPE_MDA) { 334 mda_initialize(); 335 } 336 337 /* cursor looks ugly during boot-up, so turn it off */ 338 mda_set_cursor(mda_vram_len - 1); 339 340 printk("mdacon: %s with %ldK of memory detected.\n", 341 mda_type_name, mda_vram_len/1024); 342 343 return "MDA-2"; 344 } 345 346 static void mdacon_init(struct vc_data *c, int init) 347 { 348 c->vc_complement_mask = 0x0800; /* reverse video */ 349 c->vc_display_fg = &mda_display_fg; 350 351 if (init) { 352 c->vc_cols = mda_num_columns; 353 c->vc_rows = mda_num_lines; 354 } else 355 vc_resize(c, mda_num_columns, mda_num_lines); 356 357 /* make the first MDA console visible */ 358 359 if (mda_display_fg == NULL) 360 mda_display_fg = c; 361 } 362 363 static void mdacon_deinit(struct vc_data *c) 364 { 365 /* con_set_default_unimap(c->vc_num); */ 366 367 if (mda_display_fg == c) 368 mda_display_fg = NULL; 369 } 370 371 static inline u16 mda_convert_attr(u16 ch) 372 { 373 u16 attr = 0x0700; 374 375 /* Underline and reverse-video are mutually exclusive on MDA. 376 * Since reverse-video is used for cursors and selected areas, 377 * it takes precedence. 378 */ 379 380 if (ch & 0x0800) attr = 0x7000; /* reverse */ 381 else if (ch & 0x0400) attr = 0x0100; /* underline */ 382 383 return ((ch & 0x0200) << 2) | /* intensity */ 384 (ch & 0x8000) | /* blink */ 385 (ch & 0x00ff) | attr; 386 } 387 388 static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity, 389 u8 blink, u8 underline, u8 reverse) 390 { 391 /* The attribute is just a bit vector: 392 * 393 * Bit 0..1 : intensity (0..2) 394 * Bit 2 : underline 395 * Bit 3 : reverse 396 * Bit 7 : blink 397 */ 398 399 return (intensity & 3) | 400 ((underline & 1) << 2) | 401 ((reverse & 1) << 3) | 402 ((blink & 1) << 7); 403 } 404 405 static 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)) 414 415 static 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 } 419 420 static 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 } 429 430 static 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 } 446 447 static void mdacon_bmove(struct vc_data *c, int sy, int sx, 448 int dy, int dx, int height, int width) 449 { 450 u16 *src, *dest; 451 452 if (width <= 0 || height <= 0) 453 return; 454 455 if (sx==0 && dx==0 && width==mda_num_columns) { 456 scr_memmovew(MDA_ADDR(0,dy), MDA_ADDR(0,sy), height*width*2); 457 458 } else if (dy < sy || (dy == sy && dx < sx)) { 459 src = MDA_ADDR(sx, sy); 460 dest = MDA_ADDR(dx, dy); 461 462 for (; height > 0; height--) { 463 scr_memmovew(dest, src, width*2); 464 src += mda_num_columns; 465 dest += mda_num_columns; 466 } 467 } else { 468 src = MDA_ADDR(sx, sy+height-1); 469 dest = MDA_ADDR(dx, dy+height-1); 470 471 for (; height > 0; height--) { 472 scr_memmovew(dest, src, width*2); 473 src -= mda_num_columns; 474 dest -= mda_num_columns; 475 } 476 } 477 } 478 479 static int mdacon_switch(struct vc_data *c) 480 { 481 return 1; /* redrawing needed */ 482 } 483 484 static int mdacon_set_palette(struct vc_data *c, unsigned char *table) 485 { 486 return -EINVAL; 487 } 488 489 static int mdacon_blank(struct vc_data *c, int blank, int mode_switch) 490 { 491 if (mda_type == TYPE_MDA) { 492 if (blank) 493 scr_memsetw((void *)mda_vram_base, 494 mda_convert_attr(c->vc_video_erase_char), 495 c->vc_screenbuf_size); 496 /* Tell console.c that it has to restore the screen itself */ 497 return 1; 498 } else { 499 if (blank) 500 outb_p(0x00, mda_mode_port); /* disable video */ 501 else 502 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, 503 mda_mode_port); 504 return 0; 505 } 506 } 507 508 static int mdacon_scrolldelta(struct vc_data *c, int lines) 509 { 510 return 0; 511 } 512 513 static void mdacon_cursor(struct vc_data *c, int mode) 514 { 515 if (mode == CM_ERASE) { 516 mda_set_cursor(mda_vram_len - 1); 517 return; 518 } 519 520 mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2); 521 522 switch (c->vc_cursor_type & 0x0f) { 523 524 case CUR_LOWER_THIRD: mda_set_cursor_size(10, 13); break; 525 case CUR_LOWER_HALF: mda_set_cursor_size(7, 13); break; 526 case CUR_TWO_THIRDS: mda_set_cursor_size(4, 13); break; 527 case CUR_BLOCK: mda_set_cursor_size(1, 13); break; 528 case CUR_NONE: mda_set_cursor_size(14, 13); break; 529 default: mda_set_cursor_size(12, 13); break; 530 } 531 } 532 533 static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines) 534 { 535 u16 eattr = mda_convert_attr(c->vc_video_erase_char); 536 537 if (!lines) 538 return 0; 539 540 if (lines > c->vc_rows) /* maximum realistic size */ 541 lines = c->vc_rows; 542 543 switch (dir) { 544 545 case SM_UP: 546 scr_memmovew(MDA_ADDR(0,t), MDA_ADDR(0,t+lines), 547 (b-t-lines)*mda_num_columns*2); 548 scr_memsetw(MDA_ADDR(0,b-lines), eattr, 549 lines*mda_num_columns*2); 550 break; 551 552 case SM_DOWN: 553 scr_memmovew(MDA_ADDR(0,t+lines), MDA_ADDR(0,t), 554 (b-t-lines)*mda_num_columns*2); 555 scr_memsetw(MDA_ADDR(0,t), eattr, lines*mda_num_columns*2); 556 break; 557 } 558 559 return 0; 560 } 561 562 563 /* 564 * The console `switch' structure for the MDA based console 565 */ 566 567 static const struct consw mda_con = { 568 .owner = THIS_MODULE, 569 .con_startup = mdacon_startup, 570 .con_init = mdacon_init, 571 .con_deinit = mdacon_deinit, 572 .con_clear = mdacon_clear, 573 .con_putc = mdacon_putc, 574 .con_putcs = mdacon_putcs, 575 .con_cursor = mdacon_cursor, 576 .con_scroll = mdacon_scroll, 577 .con_bmove = mdacon_bmove, 578 .con_switch = mdacon_switch, 579 .con_blank = mdacon_blank, 580 .con_set_palette = mdacon_set_palette, 581 .con_scrolldelta = mdacon_scrolldelta, 582 .con_build_attr = mdacon_build_attr, 583 .con_invert_region = mdacon_invert_region, 584 }; 585 586 int __init mda_console_init(void) 587 { 588 if (mda_first_vc > mda_last_vc) 589 return 1; 590 591 return take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0); 592 } 593 594 static void __exit mda_console_exit(void) 595 { 596 give_up_console(&mda_con); 597 } 598 599 module_init(mda_console_init); 600 module_exit(mda_console_exit); 601 602 MODULE_LICENSE("GPL"); 603 604