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 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 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(value: reg, port: mda_index_port);
115 outb_p(value: val, port: mda_value_port);
116
117 spin_unlock_irqrestore(lock: &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(value: reg, port: mda_index_port); outb_p(value: val >> 8, port: mda_value_port);
127 outb_p(value: reg+1, port: mda_index_port); outb_p(value: val & 0xff, port: mda_value_port);
128
129 spin_unlock_irqrestore(lock: &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(val: location >> 1, reg: 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, reg: 0x0a); /* disable cursor */
166 } else {
167 write_mda_b(val: from, reg: 0x0a); /* cursor start */
168 write_mda_b(val: to, reg: 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 = 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(port: mda_status_port) & MDA_STATUS_VSYNC;
269
270 for (count = 0; count < 50000 && p_save == q_save; count++) {
271 q_save = inb(port: mda_status_port) & MDA_STATUS_VSYNC;
272 udelay(2);
273 }
274
275 if (p_save != q_save) {
276 switch (inb_p(port: 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(val: 97, reg: 0x00); /* horizontal total */
298 write_mda_b(val: 80, reg: 0x01); /* horizontal displayed */
299 write_mda_b(val: 82, reg: 0x02); /* horizontal sync pos */
300 write_mda_b(val: 15, reg: 0x03); /* horizontal sync width */
301
302 write_mda_b(val: 25, reg: 0x04); /* vertical total */
303 write_mda_b(val: 6, reg: 0x05); /* vertical total adjust */
304 write_mda_b(val: 25, reg: 0x06); /* vertical displayed */
305 write_mda_b(val: 25, reg: 0x07); /* vertical sync pos */
306
307 write_mda_b(val: 2, reg: 0x08); /* interlace mode */
308 write_mda_b(val: 13, reg: 0x09); /* maximum scanline */
309 write_mda_b(val: 12, reg: 0x0a); /* cursor start */
310 write_mda_b(val: 13, reg: 0x0b); /* cursor end */
311
312 write_mda_w(val: 0x0000, reg: 0x0c); /* start address */
313 write_mda_w(val: 0x0000, reg: 0x0e); /* cursor location */
314
315 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, port: mda_mode_port);
316 outb_p(value: 0x00, port: mda_status_port);
317 outb_p(value: 0x00, port: 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(location: 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 } else
364 vc_resize(vc: c, cols: mda_num_columns, lines: 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 : 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
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(ch: c->vc_video_erase_char);
445
446 scr_memsetw(s: dest, c: eattr, count: 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(s: mda_vram_base,
460 c: mda_convert_attr(ch: c->vc_video_erase_char),
461 count: 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(value: 0x00, port: mda_mode_port); /* disable video */
467 else
468 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN,
469 port: 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(location: mda_vram_len - 1);
478 return;
479 }
480
481 mda_set_cursor(location: 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(from: 10, to: 13); break;
486 case CUR_LOWER_HALF: mda_set_cursor_size(from: 7, to: 13); break;
487 case CUR_TWO_THIRDS: mda_set_cursor_size(from: 4, to: 13); break;
488 case CUR_BLOCK: mda_set_cursor_size(from: 1, to: 13); break;
489 case CUR_NONE: mda_set_cursor_size(from: 14, to: 13); break;
490 default: mda_set_cursor_size(from: 12, to: 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(ch: 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(d: mda_addr(x: 0, y: t), s: mda_addr(x: 0, y: t + lines),
509 count: (b-t-lines)*mda_num_columns*2);
510 scr_memsetw(s: mda_addr(x: 0, y: b - lines), c: eattr,
511 count: lines*mda_num_columns*2);
512 break;
513
514 case SM_DOWN:
515 scr_memmovew(d: mda_addr(x: 0, y: t + lines), s: mda_addr(x: 0, y: t),
516 count: (b-t-lines)*mda_num_columns*2);
517 scr_memsetw(s: mda_addr(x: 0, y: t), c: eattr, count: 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
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(sw: &mda_con, first: mda_first_vc-1, last: mda_last_vc-1, deflt: 0);
552 console_unlock();
553 return err;
554}
555
556static void __exit mda_console_exit(void)
557{
558 give_up_console(sw: &mda_con);
559}
560
561module_init(mda_console_init);
562module_exit(mda_console_exit);
563
564MODULE_LICENSE("GPL");
565
566

source code of linux/drivers/video/console/mdacon.c