aboutsummaryrefslogtreecommitdiff
path: root/drivers/video/console/mdacon.c
blob: 0b67866cae10334200e1570d421cc5f74d56c7ea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
/*
 *  linux/drivers/video/mdacon.c -- Low level MDA based console driver
 *
 *	(c) 1998 Andrew Apted <ajapted@netspace.net.au>
 *
 *      including portions (c) 1995-1998 Patrick Caulfield.
 *
 *      slight improvements (c) 2000 Edward Betts <edward@debian.org>
 *
 *  This file is based on the VGA console driver (vgacon.c):
 *	
 *	Created 28 Sep 1997 by Geert Uytterhoeven
 *
 *	Rewritten by Martin Mares <mj@ucw.cz>, July 1998
 *
 *  and on the old console.c, vga.c and vesa_blank.c drivers:
 *
 *	Copyright (C) 1991, 1992  Linus Torvalds
 *			    1995  Jay Estabrook
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 *
 *  Changelog:
 *  Paul G. (03/2001) Fix mdacon= boot prompt to use __setup().
 */

#include <linux/types.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/console.h>
#include <linux/string.h>
#include <linux/kd.h>
#include <linux/vt_kern.h>
#include <linux/vt_buffer.h>
#include <linux/selection.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/init.h>

#include <asm/io.h>
#include <asm/vga.h>

static DEFINE_SPINLOCK(mda_lock);

/* description of the hardware layout */

static unsigned long	mda_vram_base;		/* Base of video memory */
static unsigned long	mda_vram_len;		/* Size of video memory */
static unsigned int	mda_num_columns;	/* Number of text columns */
static unsigned int	mda_num_lines;		/* Number of text lines */

static unsigned int	mda_index_port;		/* Register select port */
static unsigned int	mda_value_port;		/* Register value port */
static unsigned int	mda_mode_port;		/* Mode control port */
static unsigned int	mda_status_port;	/* Status and Config port */
static unsigned int	mda_gfx_port;		/* Graphics control port */

/* current hardware state */

static int	mda_cursor_loc=-1;
static int	mda_cursor_size_from=-1;
static int	mda_cursor_size_to=-1;

static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;
static char *mda_type_name;

/* console information */

static int	mda_first_vc = 13;
static int	mda_last_vc  = 16;

static struct vc_data	*mda_display_fg = NULL;

module_param(mda_first_vc, int, 0);
MODULE_PARM_DESC(mda_first_vc, "First virtual console. Default: 13");
module_param(mda_last_vc, int, 0);
MODULE_PARM_DESC(mda_last_vc, "Last virtual console. Default: 16");

/* MDA register values
 */

#define MDA_CURSOR_BLINKING	0x00
#define MDA_CURSOR_OFF		0x20
#define MDA_CURSOR_SLOWBLINK	0x60

#define MDA_MODE_GRAPHICS	0x02
#define MDA_MODE_VIDEO_EN	0x08
#define MDA_MODE_BLINK_EN	0x20
#define MDA_MODE_GFX_PAGE1	0x80

#define MDA_STATUS_HSYNC	0x01
#define MDA_STATUS_VSYNC	0x80
#define MDA_STATUS_VIDEO	0x08

#define MDA_CONFIG_COL132	0x08
#define MDA_GFX_MODE_EN		0x01
#define MDA_GFX_PAGE_EN		0x02


/*
 * MDA could easily be classified as "pre-dinosaur hardware".
 */

static void write_mda_b(unsigned int val, unsigned char reg)
{
	unsigned long flags;

	spin_lock_irqsave(&mda_lock, flags);	

	outb_p(reg, mda_index_port); 
	outb_p(val, mda_value_port);

	spin_unlock_irqrestore(&mda_lock, flags);
}

static void write_mda_w(unsigned int val, unsigned char reg)
{
	unsigned long flags;

	spin_lock_irqsave(&mda_lock, flags);

	outb_p(reg,   mda_index_port); outb_p(val >> 8,   mda_value_port);
	outb_p(reg+1, mda_index_port); outb_p(val & 0xff, mda_value_port);

	spin_unlock_irqrestore(&mda_lock, flags);
}

#ifdef TEST_MDA_B
static int test_mda_b(unsigned char val, unsigned char reg)
{
	unsigned long flags;

	spin_lock_irqsave(&mda_lock, flags);

	outb_p(reg, mda_index_port); 
	outb  (val, mda_value_port);

	udelay(20); val = (inb_p(mda_value_port) == val);

	spin_unlock_irqrestore(&mda_lock, flags);
	return val;
}
#endif

static inline void mda_set_cursor(unsigned int location) 
{
	if (mda_cursor_loc == location)
		return;

	write_mda_w(location >> 1, 0x0e);

	mda_cursor_loc = location;
}

static inline void mda_set_cursor_size(int from, int to)
{
	if (mda_cursor_size_from==from && mda_cursor_size_to==to)
		return;
	
	if (from > to) {
		write_mda_b(MDA_CURSOR_OFF, 0x0a);	/* disable cursor */
	} else {
		write_mda_b(from, 0x0a);	/* cursor start */
		write_mda_b(to,   0x0b);	/* cursor end */
	}

	mda_cursor_size_from = from;
	mda_cursor_size_to   = to;
}


#ifndef MODULE
static int __init mdacon_setup(char *str)
{
	/* command line format: mdacon=<first>,<last> */

	int ints[3];

	str = get_options(str, ARRAY_SIZE(ints), ints);

	if (ints[0] < 2)
		return 0;

	if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES || 
	    ints[2] < 1 || ints[2] > MAX_NR_CONSOLES)
		return 0;

	mda_first_vc = ints[1];
	mda_last_vc  = ints[2];
	return 1;
}

__setup("mdacon=", mdacon_setup);
#endif

static int mda_detect(void)
{
	int count=0;
	u16 *p, p_save;
	u16 *q, q_save;

	/* do a memory check */

	p = (u16 *) mda_vram_base;
	q = (u16 *) (mda_vram_base + 0x01000);

	p_save = scr_readw(p); q_save = scr_readw(q);

	scr_writew(0xAA55, p); if (scr_readw(p) == 0xAA55) count++;
	scr_writew(0x55AA, p); if (scr_readw(p) == 0x55AA) count++;
	scr_writew(p_save, p);

	if (count != 2) {
		return 0;
	}

	/* check if we have 4K or 8K */

	scr_writew(0xA55A, q); scr_writew(0x0000, p);
	if (scr_readw(q) == 0xA55A) count++;
	
	scr_writew(0x5AA5, q); scr_writew(0x0000, p);
	if (scr_readw(q) == 0x5AA5) count++;

	scr_writew(p_save, p); scr_writew(q_save, q);
	
	if (count == 4) {
		mda_vram_len = 0x02000;
	}
	
	/* Ok, there is definitely a card registering at the correct
	 * memory location, so now we do an I/O port test.
	 */

#ifdef TEST_MDA_B
	/* Edward: These two mess `tests' mess up my cursor on bootup */

	/* cursor low register */
	if (! test_mda_b(0x66, 0x0f)) {
		return 0;
	}

	/* cursor low register */
	if (! test_mda_b(0x99, 0x0f)) {
		return 0;
	}
#endif

	/* See if the card is a Hercules, by checking whether the vsync
	 * bit of the status register is changing.  This test lasts for
	 * approximately 1/10th of a second.
	 */
	
	p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;

	for (count=0; count < 50000 && p_save == q_save; count++) {
		q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;
		udelay(2);
	}

	if (p_save != q_save) {
		switch (inb_p(mda_status_port) & 0x70) {
			case 0x10:
				mda_type = TYPE_HERCPLUS;
				mda_type_name = "HerculesPlus";
				break;
			case 0x50:
				mda_type = TYPE_HERCCOLOR;
				mda_type_name = "HerculesColor";
				break;
			default:
				mda_type = TYPE_HERC;
				mda_type_name = "Hercules";
				break;
		}
	}

	return 1;
}

static void mda_initialize(void)
{
	write_mda_b(97, 0x00);		/* horizontal total */
	write_mda_b(80, 0x01);		/* horizontal displayed */
	write_mda_b(82, 0x02);		/* horizontal sync pos */
	write_mda_b(15, 0x03);		/* horizontal sync width */

	write_mda_b(25, 0x04);		/* vertical total */
	write_mda_b(6,  0x05);		/* vertical total adjust */
	write_mda_b(25, 0x06);		/* vertical displayed */
	write_mda_b(25, 0x07);		/* vertical sync pos */

	write_mda_b(2,  0x08);		/* interlace mode */
	write_mda_b(13, 0x09);		/* maximum scanline */
	write_mda_b(12, 0x0a);		/* cursor start */
	write_mda_b(13, 0x0b);		/* cursor end */

	write_mda_w(0x0000, 0x0c);	/* start address */
	write_mda_w(0x0000, 0x0e);	/* cursor location */

	outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port);
	outb_p(0x00, mda_status_port);
	outb_p(0x00, mda_gfx_port);
}

static const char *mdacon_startup(void)
{
	mda_num_columns = 80;
	mda_num_lines   = 25;

	mda_vram_len  = 0x01000;
	mda_vram_base = VGA_MAP_MEM(0xb0000, mda_vram_len);

	mda_index_port  = 0x3b4;
	mda_value_port  = 0x3b5;
	mda_mode_port   = 0x3b8;
	mda_status_port = 0x3ba;
	mda_gfx_port    = 0x3bf;

	mda_type = TYPE_MDA;
	mda_type_name = "MDA";

	if (! mda_detect()) {
		printk("mdacon: MDA card not detected.\n");
		return NULL;
	}

	if (mda_type != TYPE_MDA) {
		mda_initialize();
	}

	/* cursor looks ugly during boot-up, so turn it off */
	mda_set_cursor(mda_vram_len - 1);

	printk("mdacon: %s with %ldK of memory detected.\n",
		mda_type_name, mda_vram_len/1024);

	return "MDA-2";
}

static void mdacon_init(struct vc_data *c, int init)
{
	c->vc_complement_mask = 0x0800;	 /* reverse video */
	c->vc_display_fg = &mda_display_fg;

	if (init) {
		c->vc_cols = mda_num_columns;
		c->vc_rows = mda_num_lines;
	} else
		vc_resize(c, mda_num_columns, mda_num_lines);

	/* make the first MDA console visible */

	if (mda_display_fg == NULL)
		mda_display_fg = c;
}

static void mdacon_deinit(struct vc_data *c)
{
	/* con_set_default_unimap(c->vc_num); */

	if (mda_display_fg == c)
		mda_display_fg = NULL;
}

static inline u16 mda_convert_attr(u16 ch)
{
	u16 attr = 0x0700;

	/* Underline and reverse-video are mutually exclusive on MDA.
	 * Since reverse-video is used for cursors and selected areas,
	 * it takes precedence. 
	 */

	if (ch & 0x0800)	attr = 0x7000;	/* reverse */
	else if (ch & 0x0400)	attr = 0x0100;	/* underline */

	return ((ch & 0x0200) << 2) | 		/* intensity */ 
		(ch & 0x8000) |			/* blink */ 
		(ch & 0x00ff) | attr;
}

static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity, 
			    u8 blink, u8 underline, u8 reverse, u8 italic)
{
	/* The attribute is just a bit vector:
	 *
	 *	Bit 0..1 : intensity (0..2)
	 *	Bit 2    : underline
	 *	Bit 3    : reverse
	 *	Bit 7    : blink
	 */

	return (intensity & 3) |
		((underline & 1) << 2) |
		((reverse   & 1) << 3) |
		(!!italic << 4) |
		((blink     & 1) << 7);
}

static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
{
	for (; count > 0; count--) {
		scr_writew(scr_readw(p) ^ 0x0800, p);
		p++;
	}
}

#define MDA_ADDR(x,y)  ((u16 *) mda_vram_base + (y)*mda_num_columns + (x))

static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
{
	scr_writew(mda_convert_attr(ch), MDA_ADDR(x, y));
}

static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
		         int count, int y, int x)
{
	u16 *dest = MDA_ADDR(x, y);

	for (; count > 0; count--) {
		scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
	}
}

static void mdacon_clear(struct vc_data *c, int y, int x, 
			  int height, int width)
{
	u16 *dest = MDA_ADDR(x, y);
	u16 eattr = mda_convert_attr(c->vc_video_erase_char);

	if (width <= 0 || height <= 0)
		return;

	if (x==0 && width==mda_num_columns) {
		scr_memsetw(dest, eattr, height*width*2);
	} else {
		for (; height > 0; height--, dest+=mda_num_columns)
			scr_memsetw(dest, eattr, width*2);
	}
}
                        
static void mdacon_bmove(struct vc_data *c, int sy, int sx, 
			 int dy, int dx, int height, int width)
{
	u16 *src, *dest;

	if (width <= 0 || height <= 0)
		return;
		
	if (sx==0 && dx==0 && width==mda_num_columns) {
		scr_memmovew(MDA_ADDR(0,dy), MDA_ADDR(0,sy), height*width*2);

	} else if (dy < sy || (dy == sy && dx < sx)) {
		src  = MDA_ADDR(sx, sy);
		dest = MDA_ADDR(dx, dy);

		for (; height > 0; height--) {
			scr_memmovew(dest, src, width*2);
			src  += mda_num_columns;
			dest += mda_num_columns;
		}
	} else {
		src  = MDA_ADDR(sx, sy+height-1);
		dest = MDA_ADDR(dx, dy+height-1);

		for (; height > 0; height--) {
			scr_memmovew(dest, src, width*2);
			src  -= mda_num_columns;
			dest -= mda_num_columns;
		}
	}
}

static int mdacon_switch(struct vc_data *c)
{
	return 1;	/* redrawing needed */
}

static int mdacon_set_palette(struct vc_data *c, unsigned char *table)
{
	return -EINVAL;
}

static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
{
	if (mda_type == TYPE_MDA) {
		if (blank) 
			scr_memsetw((void *)mda_vram_base, 
				mda_convert_attr(c->vc_video_erase_char),
				c->vc_screenbuf_size);
		/* Tell console.c that it has to restore the screen itself */
		return 1;
	} else {
		if (blank)
			outb_p(0x00, mda_mode_port);	/* disable video */
		else
			outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, 
				mda_mode_port);
		return 0;
	}
}

static int mdacon_scrolldelta(struct vc_data *c, int lines)
{
	return 0;
}

static void mdacon_cursor(struct vc_data *c, int mode)
{
	if (mode == CM_ERASE) {
		mda_set_cursor(mda_vram_len - 1);
		return;
	}

	mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2);

	switch (c->vc_cursor_type & 0x0f) {

		case CUR_LOWER_THIRD:	mda_set_cursor_size(10, 13); break;
		case CUR_LOWER_HALF:	mda_set_cursor_size(7,  13); break;
		case CUR_TWO_THIRDS:	mda_set_cursor_size(4,  13); break;
		case CUR_BLOCK:		mda_set_cursor_size(1,  13); break;
		case CUR_NONE:		mda_set_cursor_size(14, 13); break;
		default:		mda_set_cursor_size(12, 13); break;
	}
}

static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
{
	u16 eattr = mda_convert_attr(c->vc_video_erase_char);

	if (!lines)
		return 0;

	if (lines > c->vc_rows)   /* maximum realistic size */
		lines = c->vc_rows;

	switch (dir) {

	case SM_UP:
		scr_memmovew(MDA_ADDR(0,t), MDA_ADDR(0,t+lines),
				(b-t-lines)*mda_num_columns*2);
		scr_memsetw(MDA_ADDR(0,b-lines), eattr,
				lines*mda_num_columns*2);
		break;

	case SM_DOWN:
		scr_memmovew(MDA_ADDR(0,t+lines), MDA_ADDR(0,t),
				(b-t-lines)*mda_num_columns*2);
		scr_memsetw(MDA_ADDR(0,t), eattr, lines*mda_num_columns*2);
		break;
	}

	return 0;
}


/*
 *  The console `switch' structure for the MDA based console
 */

static const struct consw mda_con = {
	.owner =		THIS_MODULE,
	.con_startup =		mdacon_startup,
	.con_init =		mdacon_init,
	.con_deinit =		mdacon_deinit,
	.con_clear =		mdacon_clear,
	.con_putc =		mdacon_putc,
	.con_putcs =		mdacon_putcs,
	.con_cursor =		mdacon_cursor,
	.con_scroll =		mdacon_scroll,
	.con_bmove =		mdacon_bmove,
	.con_switch =		mdacon_switch,
	.con_blank =		mdacon_blank,
	.con_set_palette =	mdacon_set_palette,
	.con_scrolldelta =	mdacon_scrolldelta,
	.con_build_attr =	mdacon_build_attr,
	.con_invert_region =	mdacon_invert_region,
};

int __init mda_console_init(void)
{
	if (mda_first_vc > mda_last_vc)
		return 1;

	return take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
}

static void __exit mda_console_exit(void)
{
	give_up_console(&mda_con);
}

module_init(mda_console_init);
module_exit(mda_console_exit);

MODULE_LICENSE("GPL");