2 * linux/drivers/video/mdacon.c -- Low level MDA based console driver
4 * (c) 1998 Andrew Apted <ajapted@netspace.net.au>
6 * including portions (c) 1995-1998 Patrick Caulfield.
8 * slight improvements (c) 2000 Edward Betts <edward@debian.org>
10 * This file is based on the VGA console driver (vgacon.c):
12 * Created 28 Sep 1997 by Geert Uytterhoeven
14 * Rewritten by Martin Mares <mj@ucw.cz>, July 1998
16 * and on the old console.c, vga.c and vesa_blank.c drivers:
18 * Copyright (C) 1991, 1992 Linus Torvalds
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
26 * Paul G. (03/2001) Fix mdacon= boot prompt to use __setup().
29 #include <linux/types.h>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/console.h>
34 #include <linux/string.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>
48 static DEFINE_SPINLOCK(mda_lock);
50 /* description of the hardware layout */
52 static unsigned long mda_vram_base; /* Base of video memory */
53 static unsigned long mda_vram_len; /* Size of video memory */
54 static unsigned int mda_num_columns; /* Number of text columns */
55 static unsigned int mda_num_lines; /* Number of text lines */
57 static unsigned int mda_index_port; /* Register select port */
58 static unsigned int mda_value_port; /* Register value port */
59 static unsigned int mda_mode_port; /* Mode control port */
60 static unsigned int mda_status_port; /* Status and Config port */
61 static unsigned int mda_gfx_port; /* Graphics control port */
63 /* current hardware state */
65 static int mda_cursor_loc=-1;
66 static int mda_cursor_size_from=-1;
67 static int mda_cursor_size_to=-1;
69 static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;
70 static char *mda_type_name;
72 /* console information */
74 static int mda_first_vc = 1;
75 static int mda_last_vc = 16;
77 static struct vc_data *mda_display_fg = NULL;
79 module_param(mda_first_vc, int, 0);
80 module_param(mda_last_vc, int, 0);
82 /* MDA register values
85 #define MDA_CURSOR_BLINKING 0x00
86 #define MDA_CURSOR_OFF 0x20
87 #define MDA_CURSOR_SLOWBLINK 0x60
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
94 #define MDA_STATUS_HSYNC 0x01
95 #define MDA_STATUS_VSYNC 0x80
96 #define MDA_STATUS_VIDEO 0x08
98 #define MDA_CONFIG_COL132 0x08
99 #define MDA_GFX_MODE_EN 0x01
100 #define MDA_GFX_PAGE_EN 0x02
104 * MDA could easily be classified as "pre-dinosaur hardware".
107 static void write_mda_b(unsigned int val, unsigned char reg)
111 spin_lock_irqsave(&mda_lock, flags);
113 outb_p(reg, mda_index_port);
114 outb_p(val, mda_value_port);
116 spin_unlock_irqrestore(&mda_lock, flags);
119 static void write_mda_w(unsigned int val, unsigned char reg)
123 spin_lock_irqsave(&mda_lock, flags);
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);
128 spin_unlock_irqrestore(&mda_lock, flags);
132 static int test_mda_b(unsigned char val, unsigned char reg)
136 spin_lock_irqsave(&mda_lock, flags);
138 outb_p(reg, mda_index_port);
139 outb (val, mda_value_port);
141 udelay(20); val = (inb_p(mda_value_port) == val);
143 spin_unlock_irqrestore(&mda_lock, flags);
148 static inline void mda_set_cursor(unsigned int location)
150 if (mda_cursor_loc == location)
153 write_mda_w(location >> 1, 0x0e);
155 mda_cursor_loc = location;
158 static inline void mda_set_cursor_size(int from, int to)
160 if (mda_cursor_size_from==from && mda_cursor_size_to==to)
164 write_mda_b(MDA_CURSOR_OFF, 0x0a); /* disable cursor */
166 write_mda_b(from, 0x0a); /* cursor start */
167 write_mda_b(to, 0x0b); /* cursor end */
170 mda_cursor_size_from = from;
171 mda_cursor_size_to = to;
176 static int __init mdacon_setup(char *str)
178 /* command line format: mdacon=<first>,<last> */
182 str = get_options(str, ARRAY_SIZE(ints), ints);
187 if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES ||
188 ints[2] < 1 || ints[2] > MAX_NR_CONSOLES)
191 mda_first_vc = ints[1];
192 mda_last_vc = ints[2];
196 __setup("mdacon=", mdacon_setup);
199 static int mda_detect(void)
205 /* do a memory check */
207 p = (u16 *) mda_vram_base;
208 q = (u16 *) (mda_vram_base + 0x01000);
210 p_save = scr_readw(p); q_save = scr_readw(q);
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);
220 /* check if we have 4K or 8K */
222 scr_writew(0xA55A, q); scr_writew(0x0000, p);
223 if (scr_readw(q) == 0xA55A) count++;
225 scr_writew(0x5AA5, q); scr_writew(0x0000, p);
226 if (scr_readw(q) == 0x5AA5) count++;
228 scr_writew(p_save, p); scr_writew(q_save, q);
231 mda_vram_len = 0x02000;
234 /* Ok, there is definitely a card registering at the correct
235 * memory location, so now we do an I/O port test.
239 /* Edward: These two mess `tests' mess up my cursor on bootup */
241 /* cursor low register */
242 if (! test_mda_b(0x66, 0x0f)) {
246 /* cursor low register */
247 if (! test_mda_b(0x99, 0x0f)) {
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.
257 p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;
259 for (count=0; count < 50000 && p_save == q_save; count++) {
260 q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;
264 if (p_save != q_save) {
265 switch (inb_p(mda_status_port) & 0x70) {
267 mda_type = TYPE_HERCPLUS;
268 mda_type_name = "HerculesPlus";
271 mda_type = TYPE_HERCCOLOR;
272 mda_type_name = "HerculesColor";
275 mda_type = TYPE_HERC;
276 mda_type_name = "Hercules";
284 static void mda_initialize(void)
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 */
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 */
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 */
301 write_mda_w(0x0000, 0x0c); /* start address */
302 write_mda_w(0x0000, 0x0e); /* cursor location */
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);
309 static const char *mdacon_startup(void)
311 mda_num_columns = 80;
314 mda_vram_len = 0x01000;
315 mda_vram_base = VGA_MAP_MEM(0xb0000, mda_vram_len);
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;
324 mda_type_name = "MDA";
326 if (! mda_detect()) {
327 printk("mdacon: MDA card not detected.\n");
331 if (mda_type != TYPE_MDA) {
335 /* cursor looks ugly during boot-up, so turn it off */
336 mda_set_cursor(mda_vram_len - 1);
338 printk("mdacon: %s with %ldK of memory detected.\n",
339 mda_type_name, mda_vram_len/1024);
344 static void mdacon_init(struct vc_data *c, int init)
346 c->vc_complement_mask = 0x0800; /* reverse video */
347 c->vc_display_fg = &mda_display_fg;
350 c->vc_cols = mda_num_columns;
351 c->vc_rows = mda_num_lines;
353 vc_resize(c, mda_num_columns, mda_num_lines);
355 /* make the first MDA console visible */
357 if (mda_display_fg == NULL)
361 static void mdacon_deinit(struct vc_data *c)
363 /* con_set_default_unimap(c->vc_num); */
365 if (mda_display_fg == c)
366 mda_display_fg = NULL;
369 static inline u16 mda_convert_attr(u16 ch)
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.
378 if (ch & 0x0800) attr = 0x7000; /* reverse */
379 else if (ch & 0x0400) attr = 0x0100; /* underline */
381 return ((ch & 0x0200) << 2) | /* intensity */
382 (ch & 0x8000) | /* blink */
383 (ch & 0x00ff) | attr;
386 static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity,
387 u8 blink, u8 underline, u8 reverse)
389 /* The attribute is just a bit vector:
391 * Bit 0..1 : intensity (0..2)
397 return (intensity & 3) |
398 ((underline & 1) << 2) |
399 ((reverse & 1) << 3) |
403 static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
405 for (; count > 0; count--) {
406 scr_writew(scr_readw(p) ^ 0x0800, p);
411 #define MDA_ADDR(x,y) ((u16 *) mda_vram_base + (y)*mda_num_columns + (x))
413 static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
415 scr_writew(mda_convert_attr(ch), MDA_ADDR(x, y));
418 static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
419 int count, int y, int x)
421 u16 *dest = MDA_ADDR(x, y);
423 for (; count > 0; count--) {
424 scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
428 static void mdacon_clear(struct vc_data *c, int y, int x,
429 int height, int width)
431 u16 *dest = MDA_ADDR(x, y);
432 u16 eattr = mda_convert_attr(c->vc_video_erase_char);
434 if (width <= 0 || height <= 0)
437 if (x==0 && width==mda_num_columns) {
438 scr_memsetw(dest, eattr, height*width*2);
440 for (; height > 0; height--, dest+=mda_num_columns)
441 scr_memsetw(dest, eattr, width*2);
445 static void mdacon_bmove(struct vc_data *c, int sy, int sx,
446 int dy, int dx, int height, int width)
450 if (width <= 0 || height <= 0)
453 if (sx==0 && dx==0 && width==mda_num_columns) {
454 scr_memmovew(MDA_ADDR(0,dy), MDA_ADDR(0,sy), height*width*2);
456 } else if (dy < sy || (dy == sy && dx < sx)) {
457 src = MDA_ADDR(sx, sy);
458 dest = MDA_ADDR(dx, dy);
460 for (; height > 0; height--) {
461 scr_memmovew(dest, src, width*2);
462 src += mda_num_columns;
463 dest += mda_num_columns;
466 src = MDA_ADDR(sx, sy+height-1);
467 dest = MDA_ADDR(dx, dy+height-1);
469 for (; height > 0; height--) {
470 scr_memmovew(dest, src, width*2);
471 src -= mda_num_columns;
472 dest -= mda_num_columns;
477 static int mdacon_switch(struct vc_data *c)
479 return 1; /* redrawing needed */
482 static int mdacon_set_palette(struct vc_data *c, unsigned char *table)
487 static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
489 if (mda_type == TYPE_MDA) {
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 */
498 outb_p(0x00, mda_mode_port); /* disable video */
500 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN,
506 static int mdacon_scrolldelta(struct vc_data *c, int lines)
511 static void mdacon_cursor(struct vc_data *c, int mode)
513 if (mode == CM_ERASE) {
514 mda_set_cursor(mda_vram_len - 1);
518 mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2);
520 switch (c->vc_cursor_type & 0x0f) {
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;
531 static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
533 u16 eattr = mda_convert_attr(c->vc_video_erase_char);
538 if (lines > c->vc_rows) /* maximum realistic size */
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);
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);
562 * The console `switch' structure for the MDA based console
565 static 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,
584 int __init mda_console_init(void)
586 if (mda_first_vc > mda_last_vc)
589 return take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
592 static void __exit mda_console_exit(void)
594 give_up_console(&mda_con);
597 module_init(mda_console_init);
598 module_exit(mda_console_exit);
600 MODULE_LICENSE("GPL");