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 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 479static int mdacon_switch(struct vc_data *c) 480{ 481 return 1; /* redrawing needed */ 482} 483 484static int mdacon_set_palette(struct vc_data *c, unsigned char *table) 485{ 486 return -EINVAL; 487} 488 489static 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 508static int mdacon_scrolldelta(struct vc_data *c, int lines) 509{ 510 return 0; 511} 512 513static 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 533static 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 567static 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 586int __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 594static void __exit mda_console_exit(void) 595{ 596 give_up_console(&mda_con); 597} 598 599module_init(mda_console_init); 600module_exit(mda_console_exit); 601 602MODULE_LICENSE("GPL"); 603 604