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 unsigned long	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 
write_mda_b(unsigned int val,unsigned char reg)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 
write_mda_w(unsigned int val,unsigned char reg)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
test_mda_b(unsigned char val,unsigned char reg)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 
mda_set_cursor(unsigned int location)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 
mda_set_cursor_size(int from,int to)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
mdacon_setup(char * str)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 
mda_detect(void)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 = (u16 *) mda_vram_base;
209 	q = (u16 *) (mda_vram_base + 0x01000);
210 
211 	p_save = scr_readw(p); q_save = scr_readw(q);
212 
213 	scr_writew(0xAA55, p); if (scr_readw(p) == 0xAA55) count++;
214 	scr_writew(0x55AA, p); if (scr_readw(p) == 0x55AA) count++;
215 	scr_writew(p_save, p);
216 
217 	if (count != 2) {
218 		return 0;
219 	}
220 
221 	/* check if we have 4K or 8K */
222 
223 	scr_writew(0xA55A, q); scr_writew(0x0000, p);
224 	if (scr_readw(q) == 0xA55A) count++;
225 
226 	scr_writew(0x5AA5, q); scr_writew(0x0000, p);
227 	if (scr_readw(q) == 0x5AA5) count++;
228 
229 	scr_writew(p_save, p); scr_writew(q_save, q);
230 
231 	if (count == 4) {
232 		mda_vram_len = 0x02000;
233 	}
234 
235 	/* Ok, there is definitely a card registering at the correct
236 	 * memory location, so now we do an I/O port test.
237 	 */
238 
239 #ifdef TEST_MDA_B
240 	/* Edward: These two mess `tests' mess up my cursor on bootup */
241 
242 	/* cursor low register */
243 	if (! test_mda_b(0x66, 0x0f)) {
244 		return 0;
245 	}
246 
247 	/* cursor low register */
248 	if (! test_mda_b(0x99, 0x0f)) {
249 		return 0;
250 	}
251 #endif
252 
253 	/* See if the card is a Hercules, by checking whether the vsync
254 	 * bit of the status register is changing.  This test lasts for
255 	 * approximately 1/10th of a second.
256 	 */
257 
258 	p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;
259 
260 	for (count=0; count < 50000 && p_save == q_save; count++) {
261 		q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;
262 		udelay(2);
263 	}
264 
265 	if (p_save != q_save) {
266 		switch (inb_p(mda_status_port) & 0x70) {
267 			case 0x10:
268 				mda_type = TYPE_HERCPLUS;
269 				mda_type_name = "HerculesPlus";
270 				break;
271 			case 0x50:
272 				mda_type = TYPE_HERCCOLOR;
273 				mda_type_name = "HerculesColor";
274 				break;
275 			default:
276 				mda_type = TYPE_HERC;
277 				mda_type_name = "Hercules";
278 				break;
279 		}
280 	}
281 
282 	return 1;
283 }
284 
mda_initialize(void)285 static void mda_initialize(void)
286 {
287 	write_mda_b(97, 0x00);		/* horizontal total */
288 	write_mda_b(80, 0x01);		/* horizontal displayed */
289 	write_mda_b(82, 0x02);		/* horizontal sync pos */
290 	write_mda_b(15, 0x03);		/* horizontal sync width */
291 
292 	write_mda_b(25, 0x04);		/* vertical total */
293 	write_mda_b(6,  0x05);		/* vertical total adjust */
294 	write_mda_b(25, 0x06);		/* vertical displayed */
295 	write_mda_b(25, 0x07);		/* vertical sync pos */
296 
297 	write_mda_b(2,  0x08);		/* interlace mode */
298 	write_mda_b(13, 0x09);		/* maximum scanline */
299 	write_mda_b(12, 0x0a);		/* cursor start */
300 	write_mda_b(13, 0x0b);		/* cursor end */
301 
302 	write_mda_w(0x0000, 0x0c);	/* start address */
303 	write_mda_w(0x0000, 0x0e);	/* cursor location */
304 
305 	outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port);
306 	outb_p(0x00, mda_status_port);
307 	outb_p(0x00, mda_gfx_port);
308 }
309 
mdacon_startup(void)310 static const char *mdacon_startup(void)
311 {
312 	mda_num_columns = 80;
313 	mda_num_lines   = 25;
314 
315 	mda_vram_len  = 0x01000;
316 	mda_vram_base = VGA_MAP_MEM(0xb0000, mda_vram_len);
317 
318 	mda_index_port  = 0x3b4;
319 	mda_value_port  = 0x3b5;
320 	mda_mode_port   = 0x3b8;
321 	mda_status_port = 0x3ba;
322 	mda_gfx_port    = 0x3bf;
323 
324 	mda_type = TYPE_MDA;
325 	mda_type_name = "MDA";
326 
327 	if (! mda_detect()) {
328 		printk("mdacon: MDA card not detected.\n");
329 		return NULL;
330 	}
331 
332 	if (mda_type != TYPE_MDA) {
333 		mda_initialize();
334 	}
335 
336 	/* cursor looks ugly during boot-up, so turn it off */
337 	mda_set_cursor(mda_vram_len - 1);
338 
339 	printk("mdacon: %s with %ldK of memory detected.\n",
340 		mda_type_name, mda_vram_len/1024);
341 
342 	return "MDA-2";
343 }
344 
mdacon_init(struct vc_data * c,int init)345 static void mdacon_init(struct vc_data *c, int init)
346 {
347 	c->vc_complement_mask = 0x0800;	 /* reverse video */
348 	c->vc_display_fg = &mda_display_fg;
349 
350 	if (init) {
351 		c->vc_cols = mda_num_columns;
352 		c->vc_rows = mda_num_lines;
353 	} else
354 		vc_resize(c, mda_num_columns, mda_num_lines);
355 
356 	/* make the first MDA console visible */
357 
358 	if (mda_display_fg == NULL)
359 		mda_display_fg = c;
360 }
361 
mdacon_deinit(struct vc_data * c)362 static void mdacon_deinit(struct vc_data *c)
363 {
364 	/* con_set_default_unimap(c->vc_num); */
365 
366 	if (mda_display_fg == c)
367 		mda_display_fg = NULL;
368 }
369 
mda_convert_attr(u16 ch)370 static inline u16 mda_convert_attr(u16 ch)
371 {
372 	u16 attr = 0x0700;
373 
374 	/* Underline and reverse-video are mutually exclusive on MDA.
375 	 * Since reverse-video is used for cursors and selected areas,
376 	 * it takes precedence.
377 	 */
378 
379 	if (ch & 0x0800)	attr = 0x7000;	/* reverse */
380 	else if (ch & 0x0400)	attr = 0x0100;	/* underline */
381 
382 	return ((ch & 0x0200) << 2) | 		/* intensity */
383 		(ch & 0x8000) |			/* blink */
384 		(ch & 0x00ff) | attr;
385 }
386 
mdacon_build_attr(struct vc_data * c,u8 color,u8 intensity,u8 blink,u8 underline,u8 reverse,u8 italic)387 static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity,
388 			    u8 blink, u8 underline, u8 reverse, u8 italic)
389 {
390 	/* The attribute is just a bit vector:
391 	 *
392 	 *	Bit 0..1 : intensity (0..2)
393 	 *	Bit 2    : underline
394 	 *	Bit 3    : reverse
395 	 *	Bit 7    : blink
396 	 */
397 
398 	return (intensity & 3) |
399 		((underline & 1) << 2) |
400 		((reverse   & 1) << 3) |
401 		(!!italic << 4) |
402 		((blink     & 1) << 7);
403 }
404 
mdacon_invert_region(struct vc_data * c,u16 * p,int count)405 static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
406 {
407 	for (; count > 0; count--) {
408 		scr_writew(scr_readw(p) ^ 0x0800, p);
409 		p++;
410 	}
411 }
412 
413 #define MDA_ADDR(x,y)  ((u16 *) mda_vram_base + (y)*mda_num_columns + (x))
414 
mdacon_putc(struct vc_data * c,int ch,int y,int x)415 static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
416 {
417 	scr_writew(mda_convert_attr(ch), MDA_ADDR(x, y));
418 }
419 
mdacon_putcs(struct vc_data * c,const unsigned short * s,int count,int y,int x)420 static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
421 		         int count, int y, int x)
422 {
423 	u16 *dest = MDA_ADDR(x, y);
424 
425 	for (; count > 0; count--) {
426 		scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
427 	}
428 }
429 
mdacon_clear(struct vc_data * c,int y,int x,int height,int width)430 static void mdacon_clear(struct vc_data *c, int y, int x,
431 			  int height, int width)
432 {
433 	u16 *dest = MDA_ADDR(x, y);
434 	u16 eattr = mda_convert_attr(c->vc_video_erase_char);
435 
436 	if (width <= 0 || height <= 0)
437 		return;
438 
439 	if (x==0 && width==mda_num_columns) {
440 		scr_memsetw(dest, eattr, height*width*2);
441 	} else {
442 		for (; height > 0; height--, dest+=mda_num_columns)
443 			scr_memsetw(dest, eattr, width*2);
444 	}
445 }
446 
mdacon_bmove(struct vc_data * c,int sy,int sx,int dy,int dx,int height,int width)447 static void mdacon_bmove(struct vc_data *c, int sy, int sx,
448 			 int dy, int dx, int height, int width)
449 {
450 	u16 *src, *dest;
451 
452 	if (width <= 0 || height <= 0)
453 		return;
454 
455 	if (sx==0 && dx==0 && width==mda_num_columns) {
456 		scr_memmovew(MDA_ADDR(0,dy), MDA_ADDR(0,sy), height*width*2);
457 
458 	} else if (dy < sy || (dy == sy && dx < sx)) {
459 		src  = MDA_ADDR(sx, sy);
460 		dest = MDA_ADDR(dx, dy);
461 
462 		for (; height > 0; height--) {
463 			scr_memmovew(dest, src, width*2);
464 			src  += mda_num_columns;
465 			dest += mda_num_columns;
466 		}
467 	} else {
468 		src  = MDA_ADDR(sx, sy+height-1);
469 		dest = MDA_ADDR(dx, dy+height-1);
470 
471 		for (; height > 0; height--) {
472 			scr_memmovew(dest, src, width*2);
473 			src  -= mda_num_columns;
474 			dest -= mda_num_columns;
475 		}
476 	}
477 }
478 
mdacon_switch(struct vc_data * c)479 static int mdacon_switch(struct vc_data *c)
480 {
481 	return 1;	/* redrawing needed */
482 }
483 
mdacon_set_palette(struct vc_data * c,unsigned char * table)484 static int mdacon_set_palette(struct vc_data *c, unsigned char *table)
485 {
486 	return -EINVAL;
487 }
488 
mdacon_blank(struct vc_data * c,int blank,int mode_switch)489 static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
490 {
491 	if (mda_type == TYPE_MDA) {
492 		if (blank)
493 			scr_memsetw((void *)mda_vram_base,
494 				mda_convert_attr(c->vc_video_erase_char),
495 				c->vc_screenbuf_size);
496 		/* Tell console.c that it has to restore the screen itself */
497 		return 1;
498 	} else {
499 		if (blank)
500 			outb_p(0x00, mda_mode_port);	/* disable video */
501 		else
502 			outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN,
503 				mda_mode_port);
504 		return 0;
505 	}
506 }
507 
mdacon_scrolldelta(struct vc_data * c,int lines)508 static int mdacon_scrolldelta(struct vc_data *c, int lines)
509 {
510 	return 0;
511 }
512 
mdacon_cursor(struct vc_data * c,int mode)513 static void mdacon_cursor(struct vc_data *c, int mode)
514 {
515 	if (mode == CM_ERASE) {
516 		mda_set_cursor(mda_vram_len - 1);
517 		return;
518 	}
519 
520 	mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2);
521 
522 	switch (c->vc_cursor_type & 0x0f) {
523 
524 		case CUR_LOWER_THIRD:	mda_set_cursor_size(10, 13); break;
525 		case CUR_LOWER_HALF:	mda_set_cursor_size(7,  13); break;
526 		case CUR_TWO_THIRDS:	mda_set_cursor_size(4,  13); break;
527 		case CUR_BLOCK:		mda_set_cursor_size(1,  13); break;
528 		case CUR_NONE:		mda_set_cursor_size(14, 13); break;
529 		default:		mda_set_cursor_size(12, 13); break;
530 	}
531 }
532 
mdacon_scroll(struct vc_data * c,int t,int b,int dir,int lines)533 static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
534 {
535 	u16 eattr = mda_convert_attr(c->vc_video_erase_char);
536 
537 	if (!lines)
538 		return 0;
539 
540 	if (lines > c->vc_rows)   /* maximum realistic size */
541 		lines = c->vc_rows;
542 
543 	switch (dir) {
544 
545 	case SM_UP:
546 		scr_memmovew(MDA_ADDR(0,t), MDA_ADDR(0,t+lines),
547 				(b-t-lines)*mda_num_columns*2);
548 		scr_memsetw(MDA_ADDR(0,b-lines), eattr,
549 				lines*mda_num_columns*2);
550 		break;
551 
552 	case SM_DOWN:
553 		scr_memmovew(MDA_ADDR(0,t+lines), MDA_ADDR(0,t),
554 				(b-t-lines)*mda_num_columns*2);
555 		scr_memsetw(MDA_ADDR(0,t), eattr, lines*mda_num_columns*2);
556 		break;
557 	}
558 
559 	return 0;
560 }
561 
562 
563 /*
564  *  The console `switch' structure for the MDA based console
565  */
566 
567 static const struct consw mda_con = {
568 	.owner =		THIS_MODULE,
569 	.con_startup =		mdacon_startup,
570 	.con_init =		mdacon_init,
571 	.con_deinit =		mdacon_deinit,
572 	.con_clear =		mdacon_clear,
573 	.con_putc =		mdacon_putc,
574 	.con_putcs =		mdacon_putcs,
575 	.con_cursor =		mdacon_cursor,
576 	.con_scroll =		mdacon_scroll,
577 	.con_bmove =		mdacon_bmove,
578 	.con_switch =		mdacon_switch,
579 	.con_blank =		mdacon_blank,
580 	.con_set_palette =	mdacon_set_palette,
581 	.con_scrolldelta =	mdacon_scrolldelta,
582 	.con_build_attr =	mdacon_build_attr,
583 	.con_invert_region =	mdacon_invert_region,
584 };
585 
mda_console_init(void)586 int __init mda_console_init(void)
587 {
588 	if (mda_first_vc > mda_last_vc)
589 		return 1;
590 
591 	return take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
592 }
593 
mda_console_exit(void)594 static void __exit mda_console_exit(void)
595 {
596 	give_up_console(&mda_con);
597 }
598 
599 module_init(mda_console_init);
600 module_exit(mda_console_exit);
601 
602 MODULE_LICENSE("GPL");
603 
604