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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/fs.h>
31#include <linux/kernel.h>
32#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/console.h>
34#include <linux/string.h>
35#include <linux/kd.h>
36#include <linux/slab.h>
37#include <linux/vt_kern.h>
38#include <linux/vt_buffer.h>
39#include <linux/selection.h>
40#include <linux/spinlock.h>
41#include <linux/ioport.h>
42#include <linux/delay.h>
43#include <linux/init.h>
44
45#include <asm/io.h>
46#include <asm/vga.h>
47
48static DEFINE_SPINLOCK(mda_lock);
49
50/* description of the hardware layout */
51
52static unsigned long mda_vram_base; /* Base of video memory */
53static unsigned long mda_vram_len; /* Size of video memory */
54static unsigned int mda_num_columns; /* Number of text columns */
55static unsigned int mda_num_lines; /* Number of text lines */
56
57static unsigned int mda_index_port; /* Register select port */
58static unsigned int mda_value_port; /* Register value port */
59static unsigned int mda_mode_port; /* Mode control port */
60static unsigned int mda_status_port; /* Status and Config port */
61static unsigned int mda_gfx_port; /* Graphics control port */
62
63/* current hardware state */
64
65static int mda_cursor_loc=-1;
66static int mda_cursor_size_from=-1;
67static int mda_cursor_size_to=-1;
68
69static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;
70static char *mda_type_name;
71
72/* console information */
73
74static int mda_first_vc = 1;
75static int mda_last_vc = 16;
76
77static struct vc_data *mda_display_fg = NULL;
78
79module_param(mda_first_vc, int, 0);
80module_param(mda_last_vc, int, 0);
81
82/* MDA register values
83 */
84
85#define MDA_CURSOR_BLINKING 0x00
86#define MDA_CURSOR_OFF 0x20
87#define MDA_CURSOR_SLOWBLINK 0x60
88
89#define MDA_MODE_GRAPHICS 0x02
90#define MDA_MODE_VIDEO_EN 0x08
91#define MDA_MODE_BLINK_EN 0x20
92#define MDA_MODE_GFX_PAGE1 0x80
93
94#define MDA_STATUS_HSYNC 0x01
95#define MDA_STATUS_VSYNC 0x80
96#define MDA_STATUS_VIDEO 0x08
97
98#define MDA_CONFIG_COL132 0x08
99#define MDA_GFX_MODE_EN 0x01
100#define MDA_GFX_PAGE_EN 0x02
101
102
103/*
104 * MDA could easily be classified as "pre-dinosaur hardware".
105 */
106
107static void write_mda_b(unsigned int val, unsigned char reg)
108{
109 unsigned long flags;
110
111 spin_lock_irqsave(&mda_lock, flags);
112
113 outb_p(reg, mda_index_port);
114 outb_p(val, mda_value_port);
115
116 spin_unlock_irqrestore(&mda_lock, flags);
117}
118
119static void write_mda_w(unsigned int val, unsigned char reg)
120{
121 unsigned long flags;
122
123 spin_lock_irqsave(&mda_lock, flags);
124
125 outb_p(reg, mda_index_port); outb_p(val >> 8, mda_value_port);
126 outb_p(reg+1, mda_index_port); outb_p(val & 0xff, mda_value_port);
127
128 spin_unlock_irqrestore(&mda_lock, flags);
129}
130
131#ifdef TEST_MDA_B
132static int test_mda_b(unsigned char val, unsigned char reg)
133{
134 unsigned long flags;
135
136 spin_lock_irqsave(&mda_lock, flags);
137
138 outb_p(reg, mda_index_port);
139 outb (val, mda_value_port);
140
141 udelay(20); val = (inb_p(mda_value_port) == val);
142
143 spin_unlock_irqrestore(&mda_lock, flags);
144 return val;
145}
146#endif
147
148static inline void mda_set_cursor(unsigned int location)
149{
150 if (mda_cursor_loc == location)
151 return;
152
153 write_mda_w(location >> 1, 0x0e);
154
155 mda_cursor_loc = location;
156}
157
158static inline void mda_set_cursor_size(int from, int to)
159{
160 if (mda_cursor_size_from==from && mda_cursor_size_to==to)
161 return;
162
163 if (from > to) {
164 write_mda_b(MDA_CURSOR_OFF, 0x0a); /* disable cursor */
165 } else {
166 write_mda_b(from, 0x0a); /* cursor start */
167 write_mda_b(to, 0x0b); /* cursor end */
168 }
169
170 mda_cursor_size_from = from;
171 mda_cursor_size_to = to;
172}
173
174
175#ifndef MODULE
176static int __init mdacon_setup(char *str)
177{
178 /* command line format: mdacon=<first>,<last> */
179
180 int ints[3];
181
182 str = get_options(str, ARRAY_SIZE(ints), ints);
183
184 if (ints[0] < 2)
185 return 0;
186
187 if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES ||
188 ints[2] < 1 || ints[2] > MAX_NR_CONSOLES)
189 return 0;
190
191 mda_first_vc = ints[1];
192 mda_last_vc = ints[2];
193 return 1;
194}
195
196__setup("mdacon=", mdacon_setup);
197#endif
198
Frederik Deweerdt7ca7b5c2006-07-30 03:03:46 -0700199static int mda_detect(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
201 int count=0;
202 u16 *p, p_save;
203 u16 *q, q_save;
204
205 /* do a memory check */
206
207 p = (u16 *) mda_vram_base;
208 q = (u16 *) (mda_vram_base + 0x01000);
209
210 p_save = scr_readw(p); q_save = scr_readw(q);
211
212 scr_writew(0xAA55, p); if (scr_readw(p) == 0xAA55) count++;
213 scr_writew(0x55AA, p); if (scr_readw(p) == 0x55AA) count++;
214 scr_writew(p_save, p);
215
216 if (count != 2) {
217 return 0;
218 }
219
220 /* check if we have 4K or 8K */
221
222 scr_writew(0xA55A, q); scr_writew(0x0000, p);
223 if (scr_readw(q) == 0xA55A) count++;
224
225 scr_writew(0x5AA5, q); scr_writew(0x0000, p);
226 if (scr_readw(q) == 0x5AA5) count++;
227
228 scr_writew(p_save, p); scr_writew(q_save, q);
229
230 if (count == 4) {
231 mda_vram_len = 0x02000;
232 }
233
234 /* Ok, there is definitely a card registering at the correct
235 * memory location, so now we do an I/O port test.
236 */
237
238#ifdef TEST_MDA_B
239 /* Edward: These two mess `tests' mess up my cursor on bootup */
240
241 /* cursor low register */
242 if (! test_mda_b(0x66, 0x0f)) {
243 return 0;
244 }
245
246 /* cursor low register */
247 if (! test_mda_b(0x99, 0x0f)) {
248 return 0;
249 }
250#endif
251
252 /* See if the card is a Hercules, by checking whether the vsync
253 * bit of the status register is changing. This test lasts for
254 * approximately 1/10th of a second.
255 */
256
257 p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;
258
259 for (count=0; count < 50000 && p_save == q_save; count++) {
260 q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;
261 udelay(2);
262 }
263
264 if (p_save != q_save) {
265 switch (inb_p(mda_status_port) & 0x70) {
266 case 0x10:
267 mda_type = TYPE_HERCPLUS;
268 mda_type_name = "HerculesPlus";
269 break;
270 case 0x50:
271 mda_type = TYPE_HERCCOLOR;
272 mda_type_name = "HerculesColor";
273 break;
274 default:
275 mda_type = TYPE_HERC;
276 mda_type_name = "Hercules";
277 break;
278 }
279 }
280
281 return 1;
282}
283
Frederik Deweerdt7ca7b5c2006-07-30 03:03:46 -0700284static void mda_initialize(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285{
286 write_mda_b(97, 0x00); /* horizontal total */
287 write_mda_b(80, 0x01); /* horizontal displayed */
288 write_mda_b(82, 0x02); /* horizontal sync pos */
289 write_mda_b(15, 0x03); /* horizontal sync width */
290
291 write_mda_b(25, 0x04); /* vertical total */
292 write_mda_b(6, 0x05); /* vertical total adjust */
293 write_mda_b(25, 0x06); /* vertical displayed */
294 write_mda_b(25, 0x07); /* vertical sync pos */
295
296 write_mda_b(2, 0x08); /* interlace mode */
297 write_mda_b(13, 0x09); /* maximum scanline */
298 write_mda_b(12, 0x0a); /* cursor start */
299 write_mda_b(13, 0x0b); /* cursor end */
300
301 write_mda_w(0x0000, 0x0c); /* start address */
302 write_mda_w(0x0000, 0x0e); /* cursor location */
303
304 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port);
305 outb_p(0x00, mda_status_port);
306 outb_p(0x00, mda_gfx_port);
307}
308
Antonino A. Daplasac08dae2006-06-26 00:27:15 -0700309static const char *mdacon_startup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310{
311 mda_num_columns = 80;
312 mda_num_lines = 25;
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 mda_vram_len = 0x01000;
Bjorn Helgaas4f1bcaf2006-06-22 14:47:32 -0700315 mda_vram_base = VGA_MAP_MEM(0xb0000, mda_vram_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317 mda_index_port = 0x3b4;
318 mda_value_port = 0x3b5;
319 mda_mode_port = 0x3b8;
320 mda_status_port = 0x3ba;
321 mda_gfx_port = 0x3bf;
322
323 mda_type = TYPE_MDA;
324 mda_type_name = "MDA";
325
326 if (! mda_detect()) {
327 printk("mdacon: MDA card not detected.\n");
328 return NULL;
329 }
330
331 if (mda_type != TYPE_MDA) {
332 mda_initialize();
333 }
334
335 /* cursor looks ugly during boot-up, so turn it off */
336 mda_set_cursor(mda_vram_len - 1);
337
338 printk("mdacon: %s with %ldK of memory detected.\n",
339 mda_type_name, mda_vram_len/1024);
340
341 return "MDA-2";
342}
343
344static void mdacon_init(struct vc_data *c, int init)
345{
346 c->vc_complement_mask = 0x0800; /* reverse video */
347 c->vc_display_fg = &mda_display_fg;
348
349 if (init) {
350 c->vc_cols = mda_num_columns;
351 c->vc_rows = mda_num_lines;
352 } else
353 vc_resize(c, mda_num_columns, mda_num_lines);
354
355 /* make the first MDA console visible */
356
357 if (mda_display_fg == NULL)
358 mda_display_fg = c;
359}
360
361static void mdacon_deinit(struct vc_data *c)
362{
363 /* con_set_default_unimap(c->vc_num); */
364
365 if (mda_display_fg == c)
366 mda_display_fg = NULL;
367}
368
369static inline u16 mda_convert_attr(u16 ch)
370{
371 u16 attr = 0x0700;
372
373 /* Underline and reverse-video are mutually exclusive on MDA.
374 * Since reverse-video is used for cursors and selected areas,
375 * it takes precedence.
376 */
377
378 if (ch & 0x0800) attr = 0x7000; /* reverse */
379 else if (ch & 0x0400) attr = 0x0100; /* underline */
380
381 return ((ch & 0x0200) << 2) | /* intensity */
382 (ch & 0x8000) | /* blink */
383 (ch & 0x00ff) | attr;
384}
385
386static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity,
387 u8 blink, u8 underline, u8 reverse)
388{
389 /* The attribute is just a bit vector:
390 *
391 * Bit 0..1 : intensity (0..2)
392 * Bit 2 : underline
393 * Bit 3 : reverse
394 * Bit 7 : blink
395 */
396
397 return (intensity & 3) |
398 ((underline & 1) << 2) |
399 ((reverse & 1) << 3) |
400 ((blink & 1) << 7);
401}
402
403static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
404{
405 for (; count > 0; count--) {
406 scr_writew(scr_readw(p) ^ 0x0800, p);
407 p++;
408 }
409}
410
411#define MDA_ADDR(x,y) ((u16 *) mda_vram_base + (y)*mda_num_columns + (x))
412
413static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
414{
415 scr_writew(mda_convert_attr(ch), MDA_ADDR(x, y));
416}
417
418static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
419 int count, int y, int x)
420{
421 u16 *dest = MDA_ADDR(x, y);
422
423 for (; count > 0; count--) {
424 scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
425 }
426}
427
428static void mdacon_clear(struct vc_data *c, int y, int x,
429 int height, int width)
430{
431 u16 *dest = MDA_ADDR(x, y);
432 u16 eattr = mda_convert_attr(c->vc_video_erase_char);
433
434 if (width <= 0 || height <= 0)
435 return;
436
437 if (x==0 && width==mda_num_columns) {
438 scr_memsetw(dest, eattr, height*width*2);
439 } else {
440 for (; height > 0; height--, dest+=mda_num_columns)
441 scr_memsetw(dest, eattr, width*2);
442 }
443}
444
445static void mdacon_bmove(struct vc_data *c, int sy, int sx,
446 int dy, int dx, int height, int width)
447{
448 u16 *src, *dest;
449
450 if (width <= 0 || height <= 0)
451 return;
452
453 if (sx==0 && dx==0 && width==mda_num_columns) {
454 scr_memmovew(MDA_ADDR(0,dy), MDA_ADDR(0,sy), height*width*2);
455
456 } else if (dy < sy || (dy == sy && dx < sx)) {
457 src = MDA_ADDR(sx, sy);
458 dest = MDA_ADDR(dx, dy);
459
460 for (; height > 0; height--) {
461 scr_memmovew(dest, src, width*2);
462 src += mda_num_columns;
463 dest += mda_num_columns;
464 }
465 } else {
466 src = MDA_ADDR(sx, sy+height-1);
467 dest = MDA_ADDR(dx, dy+height-1);
468
469 for (; height > 0; height--) {
470 scr_memmovew(dest, src, width*2);
471 src -= mda_num_columns;
472 dest -= mda_num_columns;
473 }
474 }
475}
476
477static int mdacon_switch(struct vc_data *c)
478{
479 return 1; /* redrawing needed */
480}
481
482static int mdacon_set_palette(struct vc_data *c, unsigned char *table)
483{
484 return -EINVAL;
485}
486
487static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
488{
489 if (mda_type == TYPE_MDA) {
490 if (blank)
491 scr_memsetw((void *)mda_vram_base,
492 mda_convert_attr(c->vc_video_erase_char),
493 c->vc_screenbuf_size);
494 /* Tell console.c that it has to restore the screen itself */
495 return 1;
496 } else {
497 if (blank)
498 outb_p(0x00, mda_mode_port); /* disable video */
499 else
500 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN,
501 mda_mode_port);
502 return 0;
503 }
504}
505
506static int mdacon_scrolldelta(struct vc_data *c, int lines)
507{
508 return 0;
509}
510
511static void mdacon_cursor(struct vc_data *c, int mode)
512{
513 if (mode == CM_ERASE) {
514 mda_set_cursor(mda_vram_len - 1);
515 return;
516 }
517
518 mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2);
519
520 switch (c->vc_cursor_type & 0x0f) {
521
522 case CUR_LOWER_THIRD: mda_set_cursor_size(10, 13); break;
523 case CUR_LOWER_HALF: mda_set_cursor_size(7, 13); break;
524 case CUR_TWO_THIRDS: mda_set_cursor_size(4, 13); break;
525 case CUR_BLOCK: mda_set_cursor_size(1, 13); break;
526 case CUR_NONE: mda_set_cursor_size(14, 13); break;
527 default: mda_set_cursor_size(12, 13); break;
528 }
529}
530
531static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
532{
533 u16 eattr = mda_convert_attr(c->vc_video_erase_char);
534
535 if (!lines)
536 return 0;
537
538 if (lines > c->vc_rows) /* maximum realistic size */
539 lines = c->vc_rows;
540
541 switch (dir) {
542
543 case SM_UP:
544 scr_memmovew(MDA_ADDR(0,t), MDA_ADDR(0,t+lines),
545 (b-t-lines)*mda_num_columns*2);
546 scr_memsetw(MDA_ADDR(0,b-lines), eattr,
547 lines*mda_num_columns*2);
548 break;
549
550 case SM_DOWN:
551 scr_memmovew(MDA_ADDR(0,t+lines), MDA_ADDR(0,t),
552 (b-t-lines)*mda_num_columns*2);
553 scr_memsetw(MDA_ADDR(0,t), eattr, lines*mda_num_columns*2);
554 break;
555 }
556
557 return 0;
558}
559
560
561/*
562 * The console `switch' structure for the MDA based console
563 */
564
565static const struct consw mda_con = {
566 .owner = THIS_MODULE,
567 .con_startup = mdacon_startup,
568 .con_init = mdacon_init,
569 .con_deinit = mdacon_deinit,
570 .con_clear = mdacon_clear,
571 .con_putc = mdacon_putc,
572 .con_putcs = mdacon_putcs,
573 .con_cursor = mdacon_cursor,
574 .con_scroll = mdacon_scroll,
575 .con_bmove = mdacon_bmove,
576 .con_switch = mdacon_switch,
577 .con_blank = mdacon_blank,
578 .con_set_palette = mdacon_set_palette,
579 .con_scrolldelta = mdacon_scrolldelta,
580 .con_build_attr = mdacon_build_attr,
581 .con_invert_region = mdacon_invert_region,
582};
583
584int __init mda_console_init(void)
585{
586 if (mda_first_vc > mda_last_vc)
587 return 1;
588
589 return take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
590}
591
592static void __exit mda_console_exit(void)
593{
594 give_up_console(&mda_con);
595}
596
597module_init(mda_console_init);
598module_exit(mda_console_exit);
599
600MODULE_LICENSE("GPL");
601