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, bool 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, 398 enum vc_intensity intensity, 399 bool blink, bool underline, bool reverse, 400 bool italic) 401 { 402 /* The attribute is just a bit vector: 403 * 404 * Bit 0..1 : intensity (0..2) 405 * Bit 2 : underline 406 * Bit 3 : reverse 407 * Bit 7 : blink 408 */ 409 410 return (intensity & VCI_MASK) | 411 (underline << 2) | 412 (reverse << 3) | 413 (italic << 4) | 414 (blink << 7); 415 } 416 417 static void mdacon_invert_region(struct vc_data *c, u16 *p, int count) 418 { 419 for (; count > 0; count--) { 420 scr_writew(scr_readw(p) ^ 0x0800, p); 421 p++; 422 } 423 } 424 425 static inline u16 *mda_addr(unsigned int x, unsigned int y) 426 { 427 return mda_vram_base + y * mda_num_columns + x; 428 } 429 430 static void mdacon_putcs(struct vc_data *c, const u16 *s, unsigned int count, 431 unsigned int y, unsigned int x) 432 { 433 u16 *dest = mda_addr(x, y); 434 435 for (; count > 0; count--) { 436 scr_writew(mda_convert_attr(scr_readw(s++)), dest++); 437 } 438 } 439 440 static void mdacon_clear(struct vc_data *c, unsigned int y, unsigned int x, 441 unsigned int width) 442 { 443 u16 *dest = mda_addr(x, y); 444 u16 eattr = mda_convert_attr(c->vc_video_erase_char); 445 446 scr_memsetw(dest, eattr, width * 2); 447 } 448 449 static bool mdacon_switch(struct vc_data *c) 450 { 451 return true; /* redrawing needed */ 452 } 453 454 static bool mdacon_blank(struct vc_data *c, enum vesa_blank_mode blank, 455 bool mode_switch) 456 { 457 if (mda_type == TYPE_MDA) { 458 if (blank) 459 scr_memsetw(mda_vram_base, 460 mda_convert_attr(c->vc_video_erase_char), 461 c->vc_screenbuf_size); 462 /* Tell console.c that it has to restore the screen itself */ 463 return true; 464 } else { 465 if (blank) 466 outb_p(0x00, mda_mode_port); /* disable video */ 467 else 468 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, 469 mda_mode_port); 470 return false; 471 } 472 } 473 474 static void mdacon_cursor(struct vc_data *c, bool enable) 475 { 476 if (!enable) { 477 mda_set_cursor(mda_vram_len - 1); 478 return; 479 } 480 481 mda_set_cursor(c->state.y * mda_num_columns * 2 + c->state.x * 2); 482 483 switch (CUR_SIZE(c->vc_cursor_type)) { 484 485 case CUR_LOWER_THIRD: mda_set_cursor_size(10, 13); break; 486 case CUR_LOWER_HALF: mda_set_cursor_size(7, 13); break; 487 case CUR_TWO_THIRDS: mda_set_cursor_size(4, 13); break; 488 case CUR_BLOCK: mda_set_cursor_size(1, 13); break; 489 case CUR_NONE: mda_set_cursor_size(14, 13); break; 490 default: mda_set_cursor_size(12, 13); break; 491 } 492 } 493 494 static bool mdacon_scroll(struct vc_data *c, unsigned int t, unsigned int b, 495 enum con_scroll dir, unsigned int lines) 496 { 497 u16 eattr = mda_convert_attr(c->vc_video_erase_char); 498 499 if (!lines) 500 return false; 501 502 if (lines > c->vc_rows) /* maximum realistic size */ 503 lines = c->vc_rows; 504 505 switch (dir) { 506 507 case SM_UP: 508 scr_memmovew(mda_addr(0, t), mda_addr(0, t + lines), 509 (b-t-lines)*mda_num_columns*2); 510 scr_memsetw(mda_addr(0, b - lines), eattr, 511 lines*mda_num_columns*2); 512 break; 513 514 case SM_DOWN: 515 scr_memmovew(mda_addr(0, t + lines), mda_addr(0, t), 516 (b-t-lines)*mda_num_columns*2); 517 scr_memsetw(mda_addr(0, t), eattr, lines*mda_num_columns*2); 518 break; 519 } 520 521 return false; 522 } 523 524 525 /* 526 * The console `switch' structure for the MDA based console 527 */ 528 529 static const struct consw mda_con = { 530 .owner = THIS_MODULE, 531 .con_startup = mdacon_startup, 532 .con_init = mdacon_init, 533 .con_deinit = mdacon_deinit, 534 .con_clear = mdacon_clear, 535 .con_putcs = mdacon_putcs, 536 .con_cursor = mdacon_cursor, 537 .con_scroll = mdacon_scroll, 538 .con_switch = mdacon_switch, 539 .con_blank = mdacon_blank, 540 .con_build_attr = mdacon_build_attr, 541 .con_invert_region = mdacon_invert_region, 542 }; 543 544 int __init mda_console_init(void) 545 { 546 int err; 547 548 if (mda_first_vc > mda_last_vc) 549 return 1; 550 console_lock(); 551 err = do_take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0); 552 console_unlock(); 553 return err; 554 } 555 556 static void __exit mda_console_exit(void) 557 { 558 give_up_console(&mda_con); 559 } 560 561 module_init(mda_console_init); 562 module_exit(mda_console_exit); 563 564 MODULE_LICENSE("GPL"); 565 566