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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [video/] [console/] [mdacon.c] - Blame information for rev 62

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1 62 marcus.erl
/*
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/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
 
48
static DEFINE_SPINLOCK(mda_lock);
49
 
50
/* description of the hardware layout */
51
 
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 */
56
 
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 */
62
 
63
/* current hardware state */
64
 
65
static int      mda_cursor_loc=-1;
66
static int      mda_cursor_size_from=-1;
67
static int      mda_cursor_size_to=-1;
68
 
69
static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;
70
static char *mda_type_name;
71
 
72
/* console information */
73
 
74
static int      mda_first_vc = 1;
75
static int      mda_last_vc  = 16;
76
 
77
static struct vc_data   *mda_display_fg = NULL;
78
 
79
module_param(mda_first_vc, int, 0);
80
module_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
 
107
static 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
 
119
static 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
132
static 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
 
148
static 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
 
158
static 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
176
static 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
 
199
static int mda_detect(void)
200
{
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
 
284
static void mda_initialize(void)
285
{
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
 
309
static const char *mdacon_startup(void)
310
{
311
        mda_num_columns = 80;
312
        mda_num_lines   = 25;
313
 
314
        mda_vram_len  = 0x01000;
315
        mda_vram_base = VGA_MAP_MEM(0xb0000, mda_vram_len);
316
 
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
 
344
static 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
 
361
static 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
 
369
static 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
 
386
static u8 mdacon_build_attr(struct vc_data *c, u8 color, u8 intensity,
387
                            u8 blink, u8 underline, u8 reverse, u8 italic)
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
                (!!italic << 4) |
401
                ((blink     & 1) << 7);
402
}
403
 
404
static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
405
{
406
        for (; count > 0; count--) {
407
                scr_writew(scr_readw(p) ^ 0x0800, p);
408
                p++;
409
        }
410
}
411
 
412
#define MDA_ADDR(x,y)  ((u16 *) mda_vram_base + (y)*mda_num_columns + (x))
413
 
414
static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
415
{
416
        scr_writew(mda_convert_attr(ch), MDA_ADDR(x, y));
417
}
418
 
419
static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
420
                         int count, int y, int x)
421
{
422
        u16 *dest = MDA_ADDR(x, y);
423
 
424
        for (; count > 0; count--) {
425
                scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
426
        }
427
}
428
 
429
static void mdacon_clear(struct vc_data *c, int y, int x,
430
                          int height, int width)
431
{
432
        u16 *dest = MDA_ADDR(x, y);
433
        u16 eattr = mda_convert_attr(c->vc_video_erase_char);
434
 
435
        if (width <= 0 || height <= 0)
436
                return;
437
 
438
        if (x==0 && width==mda_num_columns) {
439
                scr_memsetw(dest, eattr, height*width*2);
440
        } else {
441
                for (; height > 0; height--, dest+=mda_num_columns)
442
                        scr_memsetw(dest, eattr, width*2);
443
        }
444
}
445
 
446
static void mdacon_bmove(struct vc_data *c, int sy, int sx,
447
                         int dy, int dx, int height, int width)
448
{
449
        u16 *src, *dest;
450
 
451
        if (width <= 0 || height <= 0)
452
                return;
453
 
454
        if (sx==0 && dx==0 && width==mda_num_columns) {
455
                scr_memmovew(MDA_ADDR(0,dy), MDA_ADDR(0,sy), height*width*2);
456
 
457
        } else if (dy < sy || (dy == sy && dx < sx)) {
458
                src  = MDA_ADDR(sx, sy);
459
                dest = MDA_ADDR(dx, dy);
460
 
461
                for (; height > 0; height--) {
462
                        scr_memmovew(dest, src, width*2);
463
                        src  += mda_num_columns;
464
                        dest += mda_num_columns;
465
                }
466
        } else {
467
                src  = MDA_ADDR(sx, sy+height-1);
468
                dest = MDA_ADDR(dx, dy+height-1);
469
 
470
                for (; height > 0; height--) {
471
                        scr_memmovew(dest, src, width*2);
472
                        src  -= mda_num_columns;
473
                        dest -= mda_num_columns;
474
                }
475
        }
476
}
477
 
478
static int mdacon_switch(struct vc_data *c)
479
{
480
        return 1;       /* redrawing needed */
481
}
482
 
483
static int mdacon_set_palette(struct vc_data *c, unsigned char *table)
484
{
485
        return -EINVAL;
486
}
487
 
488
static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
489
{
490
        if (mda_type == TYPE_MDA) {
491
                if (blank)
492
                        scr_memsetw((void *)mda_vram_base,
493
                                mda_convert_attr(c->vc_video_erase_char),
494
                                c->vc_screenbuf_size);
495
                /* Tell console.c that it has to restore the screen itself */
496
                return 1;
497
        } else {
498
                if (blank)
499
                        outb_p(0x00, mda_mode_port);    /* disable video */
500
                else
501
                        outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN,
502
                                mda_mode_port);
503
                return 0;
504
        }
505
}
506
 
507
static int mdacon_scrolldelta(struct vc_data *c, int lines)
508
{
509
        return 0;
510
}
511
 
512
static void mdacon_cursor(struct vc_data *c, int mode)
513
{
514
        if (mode == CM_ERASE) {
515
                mda_set_cursor(mda_vram_len - 1);
516
                return;
517
        }
518
 
519
        mda_set_cursor(c->vc_y*mda_num_columns*2 + c->vc_x*2);
520
 
521
        switch (c->vc_cursor_type & 0x0f) {
522
 
523
                case CUR_LOWER_THIRD:   mda_set_cursor_size(10, 13); break;
524
                case CUR_LOWER_HALF:    mda_set_cursor_size(7,  13); break;
525
                case CUR_TWO_THIRDS:    mda_set_cursor_size(4,  13); break;
526
                case CUR_BLOCK:         mda_set_cursor_size(1,  13); break;
527
                case CUR_NONE:          mda_set_cursor_size(14, 13); break;
528
                default:                mda_set_cursor_size(12, 13); break;
529
        }
530
}
531
 
532
static int mdacon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
533
{
534
        u16 eattr = mda_convert_attr(c->vc_video_erase_char);
535
 
536
        if (!lines)
537
                return 0;
538
 
539
        if (lines > c->vc_rows)   /* maximum realistic size */
540
                lines = c->vc_rows;
541
 
542
        switch (dir) {
543
 
544
        case SM_UP:
545
                scr_memmovew(MDA_ADDR(0,t), MDA_ADDR(0,t+lines),
546
                                (b-t-lines)*mda_num_columns*2);
547
                scr_memsetw(MDA_ADDR(0,b-lines), eattr,
548
                                lines*mda_num_columns*2);
549
                break;
550
 
551
        case SM_DOWN:
552
                scr_memmovew(MDA_ADDR(0,t+lines), MDA_ADDR(0,t),
553
                                (b-t-lines)*mda_num_columns*2);
554
                scr_memsetw(MDA_ADDR(0,t), eattr, lines*mda_num_columns*2);
555
                break;
556
        }
557
 
558
        return 0;
559
}
560
 
561
 
562
/*
563
 *  The console `switch' structure for the MDA based console
564
 */
565
 
566
static const struct consw mda_con = {
567
        .owner =                THIS_MODULE,
568
        .con_startup =          mdacon_startup,
569
        .con_init =             mdacon_init,
570
        .con_deinit =           mdacon_deinit,
571
        .con_clear =            mdacon_clear,
572
        .con_putc =             mdacon_putc,
573
        .con_putcs =            mdacon_putcs,
574
        .con_cursor =           mdacon_cursor,
575
        .con_scroll =           mdacon_scroll,
576
        .con_bmove =            mdacon_bmove,
577
        .con_switch =           mdacon_switch,
578
        .con_blank =            mdacon_blank,
579
        .con_set_palette =      mdacon_set_palette,
580
        .con_scrolldelta =      mdacon_scrolldelta,
581
        .con_build_attr =       mdacon_build_attr,
582
        .con_invert_region =    mdacon_invert_region,
583
};
584
 
585
int __init mda_console_init(void)
586
{
587
        if (mda_first_vc > mda_last_vc)
588
                return 1;
589
 
590
        return take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
591
}
592
 
593
static void __exit mda_console_exit(void)
594
{
595
        give_up_console(&mda_con);
596
}
597
 
598
module_init(mda_console_init);
599
module_exit(mda_console_exit);
600
 
601
MODULE_LICENSE("GPL");
602
 

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