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1/*2 * linux/drivers/video/mdacon.c -- Low level MDA based console driver3 *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 Uytterhoeven13 *14 * Rewritten by Martin Mares <mj@ucw.cz>, July 199815 *16 * and on the old console.c, vga.c and vesa_blank.c drivers:17 *18 * Copyright (C) 1991, 1992 Linus Torvalds19 * 1995 Jay Estabrook20 *21 * This file is subject to the terms and conditions of the GNU General Public22 * License. See the file COPYING in the main directory of this archive for23 * 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 u16 *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 values84 */85 86#define MDA_CURSOR_BLINKING 0x0087#define MDA_CURSOR_OFF 0x2088#define MDA_CURSOR_SLOWBLINK 0x6089 90#define MDA_MODE_GRAPHICS 0x0291#define MDA_MODE_VIDEO_EN 0x0892#define MDA_MODE_BLINK_EN 0x2093#define MDA_MODE_GFX_PAGE1 0x8094 95#define MDA_STATUS_HSYNC 0x0196#define MDA_STATUS_VSYNC 0x8097#define MDA_STATUS_VIDEO 0x0898 99#define MDA_CONFIG_COL132 0x08100#define MDA_GFX_MODE_EN 0x01101#define MDA_GFX_PAGE_EN 0x02102 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_B133static 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#endif148 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 MODULE177static 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#endif199 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 = 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 correct248 * memory location, so now we do an I/O port test.249 */250 251#ifdef TEST_MDA_B252 /* 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#endif262 263 /* See if the card is a Hercules, by checking whether the vsync264 * bit of the status register is changing. This test lasts for265 * 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 295static 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 320static 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 355static 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 } else364 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 372static 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 380static 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 397static 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 : underline406 * Bit 3 : reverse407 * Bit 7 : blink408 */409 410 return (intensity & VCI_MASK) |411 (underline << 2) |412 (reverse << 3) |413 (italic << 4) |414 (blink << 7);415}416 417static 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 425static inline u16 *mda_addr(unsigned int x, unsigned int y)426{427 return mda_vram_base + y * mda_num_columns + x;428}429 430static 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 440static 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 449static bool mdacon_switch(struct vc_data *c)450{451 return true; /* redrawing needed */452}453 454static 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 else468 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, 469 mda_mode_port);470 return false;471 }472}473 474static 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 494static 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 console527 */528 529static 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 544int __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 556static void __exit mda_console_exit(void)557{558 give_up_console(&mda_con);559}560 561module_init(mda_console_init);562module_exit(mda_console_exit);563 564MODULE_DESCRIPTION("MDA based console driver");565MODULE_LICENSE("GPL");566 567