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
= 13;
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_PARM_DESC(mda_first_vc
, "First virtual console. Default: 13");
81 module_param(mda_last_vc
, int, 0);
82 MODULE_PARM_DESC(mda_last_vc
, "Last virtual console. Default: 16");
84 /* MDA register values
87 #define MDA_CURSOR_BLINKING 0x00
88 #define MDA_CURSOR_OFF 0x20
89 #define MDA_CURSOR_SLOWBLINK 0x60
91 #define MDA_MODE_GRAPHICS 0x02
92 #define MDA_MODE_VIDEO_EN 0x08
93 #define MDA_MODE_BLINK_EN 0x20
94 #define MDA_MODE_GFX_PAGE1 0x80
96 #define MDA_STATUS_HSYNC 0x01
97 #define MDA_STATUS_VSYNC 0x80
98 #define MDA_STATUS_VIDEO 0x08
100 #define MDA_CONFIG_COL132 0x08
101 #define MDA_GFX_MODE_EN 0x01
102 #define MDA_GFX_PAGE_EN 0x02
106 * MDA could easily be classified as "pre-dinosaur hardware".
109 static void write_mda_b(unsigned int val
, unsigned char reg
)
113 spin_lock_irqsave(&mda_lock
, flags
);
115 outb_p(reg
, mda_index_port
);
116 outb_p(val
, mda_value_port
);
118 spin_unlock_irqrestore(&mda_lock
, flags
);
121 static void write_mda_w(unsigned int val
, unsigned char reg
)
125 spin_lock_irqsave(&mda_lock
, flags
);
127 outb_p(reg
, mda_index_port
); outb_p(val
>> 8, mda_value_port
);
128 outb_p(reg
+1, mda_index_port
); outb_p(val
& 0xff, mda_value_port
);
130 spin_unlock_irqrestore(&mda_lock
, flags
);
134 static int test_mda_b(unsigned char val
, unsigned char reg
)
138 spin_lock_irqsave(&mda_lock
, flags
);
140 outb_p(reg
, mda_index_port
);
141 outb (val
, mda_value_port
);
143 udelay(20); val
= (inb_p(mda_value_port
) == val
);
145 spin_unlock_irqrestore(&mda_lock
, flags
);
150 static inline void mda_set_cursor(unsigned int location
)
152 if (mda_cursor_loc
== location
)
155 write_mda_w(location
>> 1, 0x0e);
157 mda_cursor_loc
= location
;
160 static inline void mda_set_cursor_size(int from
, int to
)
162 if (mda_cursor_size_from
==from
&& mda_cursor_size_to
==to
)
166 write_mda_b(MDA_CURSOR_OFF
, 0x0a); /* disable cursor */
168 write_mda_b(from
, 0x0a); /* cursor start */
169 write_mda_b(to
, 0x0b); /* cursor end */
172 mda_cursor_size_from
= from
;
173 mda_cursor_size_to
= to
;
178 static int __init
mdacon_setup(char *str
)
180 /* command line format: mdacon=<first>,<last> */
184 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
189 if (ints
[1] < 1 || ints
[1] > MAX_NR_CONSOLES
||
190 ints
[2] < 1 || ints
[2] > MAX_NR_CONSOLES
)
193 mda_first_vc
= ints
[1];
194 mda_last_vc
= ints
[2];
198 __setup("mdacon=", mdacon_setup
);
201 static int mda_detect(void)
207 /* do a memory check */
209 p
= (u16
*) mda_vram_base
;
210 q
= (u16
*) (mda_vram_base
+ 0x01000);
212 p_save
= scr_readw(p
); q_save
= scr_readw(q
);
214 scr_writew(0xAA55, p
); if (scr_readw(p
) == 0xAA55) count
++;
215 scr_writew(0x55AA, p
); if (scr_readw(p
) == 0x55AA) count
++;
216 scr_writew(p_save
, p
);
222 /* check if we have 4K or 8K */
224 scr_writew(0xA55A, q
); scr_writew(0x0000, p
);
225 if (scr_readw(q
) == 0xA55A) count
++;
227 scr_writew(0x5AA5, q
); scr_writew(0x0000, p
);
228 if (scr_readw(q
) == 0x5AA5) count
++;
230 scr_writew(p_save
, p
); scr_writew(q_save
, q
);
233 mda_vram_len
= 0x02000;
236 /* Ok, there is definitely a card registering at the correct
237 * memory location, so now we do an I/O port test.
241 /* Edward: These two mess `tests' mess up my cursor on bootup */
243 /* cursor low register */
244 if (! test_mda_b(0x66, 0x0f)) {
248 /* cursor low register */
249 if (! test_mda_b(0x99, 0x0f)) {
254 /* See if the card is a Hercules, by checking whether the vsync
255 * bit of the status register is changing. This test lasts for
256 * approximately 1/10th of a second.
259 p_save
= q_save
= inb_p(mda_status_port
) & MDA_STATUS_VSYNC
;
261 for (count
=0; count
< 50000 && p_save
== q_save
; count
++) {
262 q_save
= inb(mda_status_port
) & MDA_STATUS_VSYNC
;
266 if (p_save
!= q_save
) {
267 switch (inb_p(mda_status_port
) & 0x70) {
269 mda_type
= TYPE_HERCPLUS
;
270 mda_type_name
= "HerculesPlus";
273 mda_type
= TYPE_HERCCOLOR
;
274 mda_type_name
= "HerculesColor";
277 mda_type
= TYPE_HERC
;
278 mda_type_name
= "Hercules";
286 static void mda_initialize(void)
288 write_mda_b(97, 0x00); /* horizontal total */
289 write_mda_b(80, 0x01); /* horizontal displayed */
290 write_mda_b(82, 0x02); /* horizontal sync pos */
291 write_mda_b(15, 0x03); /* horizontal sync width */
293 write_mda_b(25, 0x04); /* vertical total */
294 write_mda_b(6, 0x05); /* vertical total adjust */
295 write_mda_b(25, 0x06); /* vertical displayed */
296 write_mda_b(25, 0x07); /* vertical sync pos */
298 write_mda_b(2, 0x08); /* interlace mode */
299 write_mda_b(13, 0x09); /* maximum scanline */
300 write_mda_b(12, 0x0a); /* cursor start */
301 write_mda_b(13, 0x0b); /* cursor end */
303 write_mda_w(0x0000, 0x0c); /* start address */
304 write_mda_w(0x0000, 0x0e); /* cursor location */
306 outb_p(MDA_MODE_VIDEO_EN
| MDA_MODE_BLINK_EN
, mda_mode_port
);
307 outb_p(0x00, mda_status_port
);
308 outb_p(0x00, mda_gfx_port
);
311 static const char *mdacon_startup(void)
313 mda_num_columns
= 80;
316 mda_vram_len
= 0x01000;
317 mda_vram_base
= VGA_MAP_MEM(0xb0000, mda_vram_len
);
319 mda_index_port
= 0x3b4;
320 mda_value_port
= 0x3b5;
321 mda_mode_port
= 0x3b8;
322 mda_status_port
= 0x3ba;
323 mda_gfx_port
= 0x3bf;
326 mda_type_name
= "MDA";
328 if (! mda_detect()) {
329 printk("mdacon: MDA card not detected.\n");
333 if (mda_type
!= TYPE_MDA
) {
337 /* cursor looks ugly during boot-up, so turn it off */
338 mda_set_cursor(mda_vram_len
- 1);
340 printk("mdacon: %s with %ldK of memory detected.\n",
341 mda_type_name
, mda_vram_len
/1024);
346 static void mdacon_init(struct vc_data
*c
, int init
)
348 c
->vc_complement_mask
= 0x0800; /* reverse video */
349 c
->vc_display_fg
= &mda_display_fg
;
352 c
->vc_cols
= mda_num_columns
;
353 c
->vc_rows
= mda_num_lines
;
355 vc_resize(c
, mda_num_columns
, mda_num_lines
);
357 /* make the first MDA console visible */
359 if (mda_display_fg
== NULL
)
363 static void mdacon_deinit(struct vc_data
*c
)
365 /* con_set_default_unimap(c->vc_num); */
367 if (mda_display_fg
== c
)
368 mda_display_fg
= NULL
;
371 static inline u16
mda_convert_attr(u16 ch
)
375 /* Underline and reverse-video are mutually exclusive on MDA.
376 * Since reverse-video is used for cursors and selected areas,
377 * it takes precedence.
380 if (ch
& 0x0800) attr
= 0x7000; /* reverse */
381 else if (ch
& 0x0400) attr
= 0x0100; /* underline */
383 return ((ch
& 0x0200) << 2) | /* intensity */
384 (ch
& 0x8000) | /* blink */
385 (ch
& 0x00ff) | attr
;
388 static u8
mdacon_build_attr(struct vc_data
*c
, u8 color
, u8 intensity
,
389 u8 blink
, u8 underline
, u8 reverse
, u8 italic
)
391 /* The attribute is just a bit vector:
393 * Bit 0..1 : intensity (0..2)
399 return (intensity
& 3) |
400 ((underline
& 1) << 2) |
401 ((reverse
& 1) << 3) |
406 static void mdacon_invert_region(struct vc_data
*c
, u16
*p
, int count
)
408 for (; count
> 0; count
--) {
409 scr_writew(scr_readw(p
) ^ 0x0800, p
);
414 #define MDA_ADDR(x,y) ((u16 *) mda_vram_base + (y)*mda_num_columns + (x))
416 static void mdacon_putc(struct vc_data
*c
, int ch
, int y
, int x
)
418 scr_writew(mda_convert_attr(ch
), MDA_ADDR(x
, y
));
421 static void mdacon_putcs(struct vc_data
*c
, const unsigned short *s
,
422 int count
, int y
, int x
)
424 u16
*dest
= MDA_ADDR(x
, y
);
426 for (; count
> 0; count
--) {
427 scr_writew(mda_convert_attr(scr_readw(s
++)), dest
++);
431 static void mdacon_clear(struct vc_data
*c
, int y
, int x
,
432 int height
, int width
)
434 u16
*dest
= MDA_ADDR(x
, y
);
435 u16 eattr
= mda_convert_attr(c
->vc_video_erase_char
);
437 if (width
<= 0 || height
<= 0)
440 if (x
==0 && width
==mda_num_columns
) {
441 scr_memsetw(dest
, eattr
, height
*width
*2);
443 for (; height
> 0; height
--, dest
+=mda_num_columns
)
444 scr_memsetw(dest
, eattr
, width
*2);
448 static void mdacon_bmove(struct vc_data
*c
, int sy
, int sx
,
449 int dy
, int dx
, int height
, int width
)
453 if (width
<= 0 || height
<= 0)
456 if (sx
==0 && dx
==0 && width
==mda_num_columns
) {
457 scr_memmovew(MDA_ADDR(0,dy
), MDA_ADDR(0,sy
), height
*width
*2);
459 } else if (dy
< sy
|| (dy
== sy
&& dx
< sx
)) {
460 src
= MDA_ADDR(sx
, sy
);
461 dest
= MDA_ADDR(dx
, dy
);
463 for (; height
> 0; height
--) {
464 scr_memmovew(dest
, src
, width
*2);
465 src
+= mda_num_columns
;
466 dest
+= mda_num_columns
;
469 src
= MDA_ADDR(sx
, sy
+height
-1);
470 dest
= MDA_ADDR(dx
, dy
+height
-1);
472 for (; height
> 0; height
--) {
473 scr_memmovew(dest
, src
, width
*2);
474 src
-= mda_num_columns
;
475 dest
-= mda_num_columns
;
480 static int mdacon_switch(struct vc_data
*c
)
482 return 1; /* redrawing needed */
485 static int mdacon_set_palette(struct vc_data
*c
, unsigned char *table
)
490 static int mdacon_blank(struct vc_data
*c
, int blank
, int mode_switch
)
492 if (mda_type
== TYPE_MDA
) {
494 scr_memsetw((void *)mda_vram_base
,
495 mda_convert_attr(c
->vc_video_erase_char
),
496 c
->vc_screenbuf_size
);
497 /* Tell console.c that it has to restore the screen itself */
501 outb_p(0x00, mda_mode_port
); /* disable video */
503 outb_p(MDA_MODE_VIDEO_EN
| MDA_MODE_BLINK_EN
,
509 static int mdacon_scrolldelta(struct vc_data
*c
, int lines
)
514 static void mdacon_cursor(struct vc_data
*c
, int mode
)
516 if (mode
== CM_ERASE
) {
517 mda_set_cursor(mda_vram_len
- 1);
521 mda_set_cursor(c
->vc_y
*mda_num_columns
*2 + c
->vc_x
*2);
523 switch (c
->vc_cursor_type
& 0x0f) {
525 case CUR_LOWER_THIRD
: mda_set_cursor_size(10, 13); break;
526 case CUR_LOWER_HALF
: mda_set_cursor_size(7, 13); break;
527 case CUR_TWO_THIRDS
: mda_set_cursor_size(4, 13); break;
528 case CUR_BLOCK
: mda_set_cursor_size(1, 13); break;
529 case CUR_NONE
: mda_set_cursor_size(14, 13); break;
530 default: mda_set_cursor_size(12, 13); break;
534 static int mdacon_scroll(struct vc_data
*c
, int t
, int b
, int dir
, int lines
)
536 u16 eattr
= mda_convert_attr(c
->vc_scrl_erase_char
);
541 if (lines
> c
->vc_rows
) /* maximum realistic size */
547 scr_memmovew(MDA_ADDR(0,t
), MDA_ADDR(0,t
+lines
),
548 (b
-t
-lines
)*mda_num_columns
*2);
549 scr_memsetw(MDA_ADDR(0,b
-lines
), eattr
,
550 lines
*mda_num_columns
*2);
554 scr_memmovew(MDA_ADDR(0,t
+lines
), MDA_ADDR(0,t
),
555 (b
-t
-lines
)*mda_num_columns
*2);
556 scr_memsetw(MDA_ADDR(0,t
), eattr
, lines
*mda_num_columns
*2);
565 * The console `switch' structure for the MDA based console
568 static const struct consw mda_con
= {
569 .owner
= THIS_MODULE
,
570 .con_startup
= mdacon_startup
,
571 .con_init
= mdacon_init
,
572 .con_deinit
= mdacon_deinit
,
573 .con_clear
= mdacon_clear
,
574 .con_putc
= mdacon_putc
,
575 .con_putcs
= mdacon_putcs
,
576 .con_cursor
= mdacon_cursor
,
577 .con_scroll
= mdacon_scroll
,
578 .con_bmove
= mdacon_bmove
,
579 .con_switch
= mdacon_switch
,
580 .con_blank
= mdacon_blank
,
581 .con_set_palette
= mdacon_set_palette
,
582 .con_scrolldelta
= mdacon_scrolldelta
,
583 .con_build_attr
= mdacon_build_attr
,
584 .con_invert_region
= mdacon_invert_region
,
587 int __init
mda_console_init(void)
589 if (mda_first_vc
> mda_last_vc
)
592 return take_over_console(&mda_con
, mda_first_vc
-1, mda_last_vc
-1, 0);
595 static void __exit
mda_console_exit(void)
597 give_up_console(&mda_con
);
600 module_init(mda_console_init
);
601 module_exit(mda_console_exit
);
603 MODULE_LICENSE("GPL");
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