aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/matrox/matroxfb_crtc2.c
blob: 2c9801090faeaa89e95b0c9d2a1ad3822052cc61 (plain) (blame)
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
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
/*
 *
 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
 *
 * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
 *
 * Portions Copyright (c) 2001 Matrox Graphics Inc.
 *
 * Version: 1.65 2002/08/14
 *
 */

#include "matroxfb_maven.h"
#include "matroxfb_crtc2.h"
#include "matroxfb_misc.h"
#include "matroxfb_DAC1064.h"
#include <linux/matroxfb.h>
#include <asm/uaccess.h>

/* **************************************************** */

static int mem = 8192;

module_param(mem, int, 0);
MODULE_PARM_DESC(mem, "Memory size reserved for dualhead (default=8MB)");

/* **************************************************** */

static int matroxfb_dh_setcolreg(unsigned regno, unsigned red, unsigned green,
		unsigned blue, unsigned transp, struct fb_info* info) {
	u_int32_t col;
#define m2info (container_of(info, struct matroxfb_dh_fb_info, fbcon))

	if (regno >= 16)
		return 1;
	if (m2info->fbcon.var.grayscale) {
		/* gray = 0.30*R + 0.59*G + 0.11*B */
		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
	}
	red = CNVT_TOHW(red, m2info->fbcon.var.red.length);
	green = CNVT_TOHW(green, m2info->fbcon.var.green.length);
	blue = CNVT_TOHW(blue, m2info->fbcon.var.blue.length);
	transp = CNVT_TOHW(transp, m2info->fbcon.var.transp.length);

	col = (red << m2info->fbcon.var.red.offset)     |
	      (green << m2info->fbcon.var.green.offset) |
	      (blue << m2info->fbcon.var.blue.offset)   |
	      (transp << m2info->fbcon.var.transp.offset);

	switch (m2info->fbcon.var.bits_per_pixel) {
		case 16:
			m2info->cmap[regno] = col | (col << 16);
			break;
		case 32:
			m2info->cmap[regno] = col;
			break;
	}
	return 0;
#undef m2info
}

static void matroxfb_dh_restore(struct matroxfb_dh_fb_info* m2info,
		struct my_timming* mt,
		int mode,
		unsigned int pos) {
	u_int32_t tmp;
	u_int32_t datactl;
	MINFO_FROM(m2info->primary_dev);

	switch (mode) {
		case 15:
			tmp = 0x00200000;
			break;
		case 16:
			tmp = 0x00400000;
			break;
/*		case 32: */
		default:
			tmp = 0x00800000;
			break;
	}
	tmp |= 0x00000001;	/* enable CRTC2 */
	datactl = 0;
	if (ACCESS_FBINFO(outputs[1]).src == MATROXFB_SRC_CRTC2) {
		if (ACCESS_FBINFO(devflags.g450dac)) {
			tmp |= 0x00000006; /* source from secondary pixel PLL */
			/* no vidrst when in monitor mode */
			if (ACCESS_FBINFO(outputs[1]).mode != MATROXFB_OUTPUT_MODE_MONITOR) {
				tmp |=  0xC0001000; /* Enable H/V vidrst */
			}
		} else {
			tmp |= 0x00000002; /* source from VDOCLK */
			tmp |= 0xC0000000; /* enable vvidrst & hvidrst */
			/* MGA TVO is our clock source */
		}
	} else if (ACCESS_FBINFO(outputs[0]).src == MATROXFB_SRC_CRTC2) {
		tmp |= 0x00000004; /* source from pixclock */
		/* PIXPLL is our clock source */
	}
	if (ACCESS_FBINFO(outputs[0]).src == MATROXFB_SRC_CRTC2) {
		tmp |= 0x00100000;	/* connect CRTC2 to DAC */
	}
	if (mt->interlaced) {
		tmp |= 0x02000000;	/* interlaced, second field is bigger, as G450 apparently ignores it */
		mt->VDisplay >>= 1;
		mt->VSyncStart >>= 1;
		mt->VSyncEnd >>= 1;
		mt->VTotal >>= 1;
	}
	if ((mt->HTotal & 7) == 2) {
		datactl |= 0x00000010;
		mt->HTotal &= ~7;
	}
	tmp |= 0x10000000;	/* 0x10000000 is VIDRST polarity */
	mga_outl(0x3C14, ((mt->HDisplay - 8) << 16) | (mt->HTotal - 8));
	mga_outl(0x3C18, ((mt->HSyncEnd - 8) << 16) | (mt->HSyncStart - 8));
	mga_outl(0x3C1C, ((mt->VDisplay - 1) << 16) | (mt->VTotal - 1));
	mga_outl(0x3C20, ((mt->VSyncEnd - 1) << 16) | (mt->VSyncStart - 1));
	mga_outl(0x3C24, ((mt->VSyncStart) << 16) | (mt->HSyncStart));	/* preload */
	{
		u_int32_t linelen = m2info->fbcon.var.xres_virtual * (m2info->fbcon.var.bits_per_pixel >> 3);
		if (tmp & 0x02000000) {
			/* field #0 is smaller, so... */
			mga_outl(0x3C2C, pos);			/* field #1 vmemory start */
			mga_outl(0x3C28, pos + linelen);	/* field #0 vmemory start */
			linelen <<= 1;
			m2info->interlaced = 1;
		} else {
			mga_outl(0x3C28, pos);		/* vmemory start */
			m2info->interlaced = 0;
		}
		mga_outl(0x3C40, linelen);
	}
	mga_outl(0x3C4C, datactl);	/* data control */
	if (tmp & 0x02000000) {
		int i;

		mga_outl(0x3C10, tmp & ~0x02000000);
		for (i = 0; i < 2; i++) {
			unsigned int nl;
			unsigned int lastl = 0;

			while ((nl = mga_inl(0x3C48) & 0xFFF) >= lastl) {
				lastl = nl;
			}
		}
	}
	mga_outl(0x3C10, tmp);
	ACCESS_FBINFO(hw).crtc2.ctl = tmp;

	tmp = mt->VDisplay << 16;	/* line compare */
	if (mt->sync & FB_SYNC_HOR_HIGH_ACT)
		tmp |= 0x00000100;
	if (mt->sync & FB_SYNC_VERT_HIGH_ACT)
		tmp |= 0x00000200;
	mga_outl(0x3C44, tmp);
}

static void matroxfb_dh_disable(struct matroxfb_dh_fb_info* m2info) {
	MINFO_FROM(m2info->primary_dev);

	mga_outl(0x3C10, 0x00000004);	/* disable CRTC2, CRTC1->DAC1, PLL as clock source */
	ACCESS_FBINFO(hw).crtc2.ctl = 0x00000004;
}

static void matroxfb_dh_cfbX_init(struct matroxfb_dh_fb_info* m2info) {
	/* no acceleration for secondary head... */
	m2info->cmap[16] = 0xFFFFFFFF;
}

static void matroxfb_dh_pan_var(struct matroxfb_dh_fb_info* m2info,
		struct fb_var_screeninfo* var) {
	unsigned int pos;
	unsigned int linelen;
	unsigned int pixelsize;
	MINFO_FROM(m2info->primary_dev);

	m2info->fbcon.var.xoffset = var->xoffset;
	m2info->fbcon.var.yoffset = var->yoffset;
	pixelsize = m2info->fbcon.var.bits_per_pixel >> 3;
	linelen = m2info->fbcon.var.xres_virtual * pixelsize;
	pos = m2info->fbcon.var.yoffset * linelen + m2info->fbcon.var.xoffset * pixelsize;
	pos += m2info->video.offbase;
	if (m2info->interlaced) {
		mga_outl(0x3C2C, pos);
		mga_outl(0x3C28, pos + linelen);
	} else {
		mga_outl(0x3C28, pos);
	}
}

static int matroxfb_dh_decode_var(struct matroxfb_dh_fb_info* m2info,
		struct fb_var_screeninfo* var,
		int *visual,
		int *video_cmap_len,
		int *mode) {
	unsigned int mask;
	unsigned int memlen;
	unsigned int vramlen;

	switch (var->bits_per_pixel) {
		case 16:	mask = 0x1F;
				break;
		case 32:	mask = 0x0F;
				break;
		default:	return -EINVAL;
	}
	vramlen = m2info->video.len_usable;
	if (var->yres_virtual < var->yres)
		var->yres_virtual = var->yres;
	if (var->xres_virtual < var->xres)
		var->xres_virtual = var->xres;
	var->xres_virtual = (var->xres_virtual + mask) & ~mask;
	if (var->yres_virtual > 32767)
		return -EINVAL;
	memlen = var->xres_virtual * var->yres_virtual * (var->bits_per_pixel >> 3);
	if (memlen > vramlen)
		return -EINVAL;
	if (var->xoffset + var->xres > var->xres_virtual)
		var->xoffset = var->xres_virtual - var->xres;
	if (var->yoffset + var->yres > var->yres_virtual)
		var->yoffset = var->yres_virtual - var->yres;

	var->xres &= ~7;
	var->left_margin &= ~7;
	var->right_margin &= ~7;
	var->hsync_len &= ~7;

	*mode = var->bits_per_pixel;
	if (var->bits_per_pixel == 16) {
		if (var->green.length == 5) {
			var->red.offset = 10;
			var->red.length = 5;
			var->green.offset = 5;
			var->green.length = 5;
			var->blue.offset = 0;
			var->blue.length = 5;
			var->transp.offset = 15;
			var->transp.length = 1;
			*mode = 15;
		} else {
			var->red.offset = 11;
			var->red.length = 5;
			var->green.offset = 5;
			var->green.length = 6;
			var->blue.offset = 0;
			var->blue.length = 5;
			var->transp.offset = 0;
			var->transp.length = 0;
		}
	} else {
			var->red.offset = 16;
			var->red.length = 8;
			var->green.offset = 8;
			var->green.length = 8;
			var->blue.offset = 0;
			var->blue.length = 8;
			var->transp.offset = 24;
			var->transp.length = 8;
	}
	*visual = FB_VISUAL_TRUECOLOR;
	*video_cmap_len = 16;
	return 0;
}

static int matroxfb_dh_open(struct fb_info* info, int user) {
#define m2info (container_of(info, struct matroxfb_dh_fb_info, fbcon))
	MINFO_FROM(m2info->primary_dev);

	if (MINFO) {
		int err;

		if (ACCESS_FBINFO(dead)) {
			return -ENXIO;
		}
		err = ACCESS_FBINFO(fbops).fb_open(&ACCESS_FBINFO(fbcon), user);
		if (err) {
			return err;
		}
	}
	return 0;
#undef m2info
}

static int matroxfb_dh_release(struct fb_info* info, int user) {
#define m2info (container_of(info, struct matroxfb_dh_fb_info, fbcon))
	int err = 0;
	MINFO_FROM(m2info->primary_dev);

	if (MINFO) {
		err = ACCESS_FBINFO(fbops).fb_release(&ACCESS_FBINFO(fbcon), user);
	}
	return err;
#undef m2info
}

static void matroxfb_dh_init_fix(struct matroxfb_dh_fb_info *m2info) {
	struct fb_fix_screeninfo *fix = &m2info->fbcon.fix;

	strcpy(fix->id, "MATROX DH");

	fix->smem_start = m2info->video.base;
	fix->smem_len = m2info->video.len_usable;
	fix->ypanstep = 1;
	fix->ywrapstep = 0;
	fix->xpanstep = 8;	/* TBD */
	fix->mmio_start = m2info->mmio.base;
	fix->mmio_len = m2info->mmio.len;
	fix->accel = 0;		/* no accel... */
}

static int matroxfb_dh_check_var(struct fb_var_screeninfo* var, struct fb_info* info) {
#define m2info (container_of(info, struct matroxfb_dh_fb_info, fbcon))
	int visual;
	int cmap_len;
	int mode;

	return matroxfb_dh_decode_var(m2info, var, &visual, &cmap_len, &mode);
#undef m2info
}

static int matroxfb_dh_set_par(struct fb_info* info) {
#define m2info (container_of(info, struct matroxfb_dh_fb_info, fbcon))
	int visual;
	int cmap_len;
	int mode;
	int err;
	struct fb_var_screeninfo* var = &info->var;
	MINFO_FROM(m2info->primary_dev);

	if ((err = matroxfb_dh_decode_var(m2info, var, &visual, &cmap_len, &mode)) != 0)
		return err;
	/* cmap */
	{
		m2info->fbcon.screen_base = vaddr_va(m2info->video.vbase);
		m2info->fbcon.fix.visual = visual;
		m2info->fbcon.fix.type = FB_TYPE_PACKED_PIXELS;
		m2info->fbcon.fix.type_aux = 0;
		m2info->fbcon.fix.line_length = (var->xres_virtual * var->bits_per_pixel) >> 3;
	}
	{
		struct my_timming mt;
		unsigned int pos;
		int out;
		int cnt;

		matroxfb_var2my(&m2info->fbcon.var, &mt);
		mt.crtc = MATROXFB_SRC_CRTC2;
		/* CRTC2 delay */
		mt.delay = 34;

		pos = (m2info->fbcon.var.yoffset * m2info->fbcon.var.xres_virtual + m2info->fbcon.var.xoffset) * m2info->fbcon.var.bits_per_pixel >> 3;
		pos += m2info->video.offbase;
		cnt = 0;
		down_read(&ACCESS_FBINFO(altout).lock);
		for (out = 0; out < MATROXFB_MAX_OUTPUTS; out++) {
			if (ACCESS_FBINFO(outputs[out]).src == MATROXFB_SRC_CRTC2) {
				cnt++;
				if (ACCESS_FBINFO(outputs[out]).output->compute) {
					ACCESS_FBINFO(outputs[out]).output->compute(ACCESS_FBINFO(outputs[out]).data, &mt);
				}
			}
		}
		ACCESS_FBINFO(crtc2).pixclock = mt.pixclock;
		ACCESS_FBINFO(crtc2).mnp = mt.mnp;
		up_read(&ACCESS_FBINFO(altout).lock);
		if (cnt) {
			matroxfb_dh_restore(m2info, &mt, mode, pos);
		} else {
			matroxfb_dh_disable(m2info);
		}
		DAC1064_global_init(PMINFO2);
		DAC1064_global_restore(PMINFO2);
		down_read(&ACCESS_FBINFO(altout).lock);
		for (out = 0; out < MATROXFB_MAX_OUTPUTS; out++) {
			if (ACCESS_FBINFO(outputs[out]).src == MATROXFB_SRC_CRTC2 &&
			    ACCESS_FBINFO(outputs[out]).output->program) {
				ACCESS_FBINFO(outputs[out]).output->program(ACCESS_FBINFO(outputs[out]).data);
			}
		}
		for (out = 0; out < MATROXFB_MAX_OUTPUTS; out++) {
			if (ACCESS_FBINFO(outputs[out]).src == MATROXFB_SRC_CRTC2 &&
			    ACCESS_FBINFO(outputs[out]).output->start) {
				ACCESS_FBINFO(outputs[out]).output->start(ACCESS_FBINFO(outputs[out]).data);
			}
		}
		up_read(&ACCESS_FBINFO(altout).lock);
		matroxfb_dh_cfbX_init(m2info);
	}
	m2info->initialized = 1;
	return 0;
#undef m2info
}

static int matroxfb_dh_pan_display(struct fb_var_screeninfo* var, struct fb_info* info) {
#define m2info (container_of(info, struct matroxfb_dh_fb_info, fbcon))
	matroxfb_dh_pan_var(m2info, var);
	return 0;
#undef m2info
}

static int matroxfb_dh_get_vblank(const struct matroxfb_dh_fb_info* m2info, struct fb_vblank* vblank) {
	MINFO_FROM(m2info->primary_dev);

	matroxfb_enable_irq(PMINFO 0);
	memset(vblank, 0, sizeof(*vblank));
	vblank->flags = FB_VBLANK_HAVE_VCOUNT | FB_VBLANK_HAVE_VBLANK;
	/* mask out reserved bits + field number (odd/even) */
	vblank->vcount = mga_inl(0x3C48) & 0x000007FF;
	/* compatibility stuff */
	if (vblank->vcount >= m2info->fbcon.var.yres)
		vblank->flags |= FB_VBLANK_VBLANKING;
        if (test_bit(0, &ACCESS_FBINFO(irq_flags))) {
                vblank->flags |= FB_VBLANK_HAVE_COUNT;
                /* Only one writer, aligned int value...
                   it should work without lock and without atomic_t */
                vblank->count = ACCESS_FBINFO(crtc2).vsync.cnt;
        }
	return 0;
}

static int matroxfb_dh_ioctl(struct fb_info *info,
		unsigned int cmd,
		unsigned long arg)
{
#define m2info (container_of(info, struct matroxfb_dh_fb_info, fbcon))
	MINFO_FROM(m2info->primary_dev);

	DBG(__FUNCTION__)

	switch (cmd) {
		case FBIOGET_VBLANK:
			{
				struct fb_vblank vblank;
				int err;

				err = matroxfb_dh_get_vblank(m2info, &vblank);
				if (err)
					return err;
				if (copy_to_user((void __user *)arg, &vblank, sizeof(vblank)))
					return -EFAULT;
				return 0;
			}
		case FBIO_WAITFORVSYNC:
			{
				u_int32_t crt;

				if (get_user(crt, (u_int32_t __user *)arg))
					return -EFAULT;

				if (crt != 0)
					return -ENODEV;
				return matroxfb_wait_for_sync(PMINFO 1);
			}
		case MATROXFB_SET_OUTPUT_MODE:
		case MATROXFB_GET_OUTPUT_MODE:
		case MATROXFB_GET_ALL_OUTPUTS:
			{
				return ACCESS_FBINFO(fbcon.fbops)->fb_ioctl(&ACCESS_FBINFO(fbcon), cmd, arg);
			}
		case MATROXFB_SET_OUTPUT_CONNECTION:
			{
				u_int32_t tmp;
				int out;
				int changes;

				if (get_user(tmp, (u_int32_t __user *)arg))
					return -EFAULT;
				for (out = 0; out < 32; out++) {
					if (tmp & (1 << out)) {
						if (out >= MATROXFB_MAX_OUTPUTS)
							return -ENXIO;
						if (!ACCESS_FBINFO(outputs[out]).output)
							return -ENXIO;
						switch (ACCESS_FBINFO(outputs[out]).src) {
							case MATROXFB_SRC_NONE:
							case MATROXFB_SRC_CRTC2:
								break;
							default:
								return -EBUSY;
						}
					}
				}
				if (ACCESS_FBINFO(devflags.panellink)) {
					if (tmp & MATROXFB_OUTPUT_CONN_DFP)
						return -EINVAL;
					if ((ACCESS_FBINFO(outputs[2]).src == MATROXFB_SRC_CRTC1) && tmp)
						return -EBUSY;
				}
				changes = 0;
				for (out = 0; out < MATROXFB_MAX_OUTPUTS; out++) {
					if (tmp & (1 << out)) {
						if (ACCESS_FBINFO(outputs[out]).src != MATROXFB_SRC_CRTC2) {
							changes = 1;
							ACCESS_FBINFO(outputs[out]).src = MATROXFB_SRC_CRTC2;
						}
					} else if (ACCESS_FBINFO(outputs[out]).src == MATROXFB_SRC_CRTC2) {
						changes = 1;
						ACCESS_FBINFO(outputs[out]).src = MATROXFB_SRC_NONE;
					}
				}
				if (!changes)
					return 0;
				matroxfb_dh_set_par(info);
				return 0;
			}
		case MATROXFB_GET_OUTPUT_CONNECTION:
			{
				u_int32_t conn = 0;
				int out;

				for (out = 0; out < MATROXFB_MAX_OUTPUTS; out++) {
					if (ACCESS_FBINFO(outputs[out]).src == MATROXFB_SRC_CRTC2) {
						conn |= 1 << out;
					}
				}
				if (put_user(conn, (u_int32_t __user *)arg))
					return -EFAULT;
				return 0;
			}
		case MATROXFB_GET_AVAILABLE_OUTPUTS:
			{
				u_int32_t tmp = 0;
				int out;

				for (out = 0; out < MATROXFB_MAX_OUTPUTS; out++) {
					if (ACCESS_FBINFO(outputs[out]).output) {
						switch (ACCESS_FBINFO(outputs[out]).src) {
							case MATROXFB_SRC_NONE:
							case MATROXFB_SRC_CRTC2:
								tmp |= 1 << out;
								break;
						}
					}
				}
				if (ACCESS_FBINFO(devflags.panellink)) {
					tmp &= ~MATROXFB_OUTPUT_CONN_DFP;
					if (ACCESS_FBINFO(outputs[2]).src == MATROXFB_SRC_CRTC1) {
						tmp = 0;
					}
				}
				if (put_user(tmp, (u_int32_t __user *)arg))
					return -EFAULT;
				return 0;
			}
	}
	return -ENOTTY;
#undef m2info
}

static int matroxfb_dh_blank(int blank, struct fb_info* info) {
#define m2info (container_of(info, struct matroxfb_dh_fb_info, fbcon))
	switch (blank) {
		case 1:
		case 2:
		case 3:
		case 4:
		default:;
	}
	/* do something... */
	return 0;
#undef m2info
}

static struct fb_ops matroxfb_dh_ops = {
	.owner =	THIS_MODULE,
	.fb_open =	matroxfb_dh_open,
	.fb_release =	matroxfb_dh_release,
	.fb_check_var =	matroxfb_dh_check_var,
	.fb_set_par =	matroxfb_dh_set_par,
	.fb_setcolreg =	matroxfb_dh_setcolreg,
	.fb_pan_display =matroxfb_dh_pan_display,
	.fb_blank =	matroxfb_dh_blank,
	.fb_ioctl =	matroxfb_dh_ioctl,
	.fb_fillrect =	cfb_fillrect,
	.fb_copyarea =	cfb_copyarea,
	.fb_imageblit =	cfb_imageblit,
};

static struct fb_var_screeninfo matroxfb_dh_defined = {
		640,480,640,480,/* W,H, virtual W,H */
		0,0,		/* offset */
		32,		/* depth */
		0,		/* gray */
		{0,0,0},	/* R */
		{0,0,0},	/* G */
		{0,0,0},	/* B */
		{0,0,0},	/* alpha */
		0,		/* nonstd */
		FB_ACTIVATE_NOW,
		-1,-1,		/* display size */
		0,		/* accel flags */
		39721L,48L,16L,33L,10L,
		96L,2,0,	/* no sync info */
		FB_VMODE_NONINTERLACED,
		0, {0,0,0,0,0}
};

static int matroxfb_dh_regit(CPMINFO struct matroxfb_dh_fb_info* m2info) {
#define minfo (m2info->primary_dev)
	void* oldcrtc2;

	m2info->fbcon.fbops = &matroxfb_dh_ops;
	m2info->fbcon.flags = FBINFO_FLAG_DEFAULT;
	m2info->fbcon.flags |= FBINFO_HWACCEL_XPAN |
			       FBINFO_HWACCEL_YPAN;
	m2info->fbcon.pseudo_palette = m2info->cmap;
	fb_alloc_cmap(&m2info->fbcon.cmap, 256, 1);

	if (mem < 64)
		mem *= 1024;
	if (mem < 64*1024)
		mem *= 1024;
	mem &= ~0x00000FFF;	/* PAGE_MASK? */
	if (ACCESS_FBINFO(video.len_usable) + mem <= ACCESS_FBINFO(video.len))
		m2info->video.offbase = ACCESS_FBINFO(video.len) - mem;
	else if (ACCESS_FBINFO(video.len) < mem) {
		return -ENOMEM;
	} else { /* check yres on first head... */
		m2info->video.borrowed = mem;
		ACCESS_FBINFO(video.len_usable) -= mem;
		m2info->video.offbase = ACCESS_FBINFO(video.len_usable);
	}
	m2info->video.base = ACCESS_FBINFO(video.base) + m2info->video.offbase;
	m2info->video.len = m2info->video.len_usable = m2info->video.len_maximum = mem;
	m2info->video.vbase.vaddr = vaddr_va(ACCESS_FBINFO(video.vbase)) + m2info->video.offbase;
	m2info->mmio.base = ACCESS_FBINFO(mmio.base);
	m2info->mmio.vbase = ACCESS_FBINFO(mmio.vbase);
	m2info->mmio.len = ACCESS_FBINFO(mmio.len);

	matroxfb_dh_init_fix(m2info);
	if (register_framebuffer(&m2info->fbcon)) {
		return -ENXIO;
	}
	if (!m2info->initialized)
		fb_set_var(&m2info->fbcon, &matroxfb_dh_defined);
	down_write(&ACCESS_FBINFO(crtc2.lock));
	oldcrtc2 = ACCESS_FBINFO(crtc2.info);
	ACCESS_FBINFO(crtc2.info) = m2info;
	up_write(&ACCESS_FBINFO(crtc2.lock));
	if (oldcrtc2) {
		printk(KERN_ERR "matroxfb_crtc2: Internal consistency check failed: crtc2 already present: %p\n",
			oldcrtc2);
	}
	return 0;
#undef minfo
}

/* ************************** */

static int matroxfb_dh_registerfb(struct matroxfb_dh_fb_info* m2info) {
#define minfo (m2info->primary_dev)
	if (matroxfb_dh_regit(PMINFO m2info)) {
		printk(KERN_ERR "matroxfb_crtc2: secondary head failed to register\n");
		return -1;
	}
	printk(KERN_INFO "matroxfb_crtc2: secondary head of fb%u was registered as fb%u\n",
		ACCESS_FBINFO(fbcon.node), m2info->fbcon.node);
	m2info->fbcon_registered = 1;
	return 0;
#undef minfo
}

static void matroxfb_dh_deregisterfb(struct matroxfb_dh_fb_info* m2info) {
#define minfo (m2info->primary_dev)
	if (m2info->fbcon_registered) {
		int id;
		struct matroxfb_dh_fb_info* crtc2;

		down_write(&ACCESS_FBINFO(crtc2.lock));
		crtc2 = ACCESS_FBINFO(crtc2.info);
		if (crtc2 == m2info)
			ACCESS_FBINFO(crtc2.info) = NULL;
		up_write(&ACCESS_FBINFO(crtc2.lock));
		if (crtc2 != m2info) {
			printk(KERN_ERR "matroxfb_crtc2: Internal consistency check failed: crtc2 mismatch at unload: %p != %p\n",
				crtc2, m2info);
			printk(KERN_ERR "matroxfb_crtc2: Expect kernel crash after module unload.\n");
			return;
		}
		id = m2info->fbcon.node;
		unregister_framebuffer(&m2info->fbcon);
		/* return memory back to primary head */
		ACCESS_FBINFO(video.len_usable) += m2info->video.borrowed;
		printk(KERN_INFO "matroxfb_crtc2: fb%u unregistered\n", id);
		m2info->fbcon_registered = 0;
	}
#undef minfo
}

static void* matroxfb_crtc2_probe(struct matrox_fb_info* minfo) {
	struct matroxfb_dh_fb_info* m2info;

	/* hardware is CRTC2 incapable... */
	if (!ACCESS_FBINFO(devflags.crtc2))
		return NULL;
	m2info = kmalloc(sizeof(*m2info), GFP_KERNEL);
	if (!m2info) {
		printk(KERN_ERR "matroxfb_crtc2: Not enough memory for CRTC2 control structs\n");
		return NULL;
	}
	memset(m2info, 0, sizeof(*m2info));
	m2info->primary_dev = MINFO;
	if (matroxfb_dh_registerfb(m2info)) {
		kfree(m2info);
		printk(KERN_ERR "matroxfb_crtc2: CRTC2 framebuffer failed to register\n");
		return NULL;
	}
	return m2info;
}

static void matroxfb_crtc2_remove(struct matrox_fb_info* minfo, void* crtc2) {
	matroxfb_dh_deregisterfb(crtc2);
	kfree(crtc2);
}

static struct matroxfb_driver crtc2 = {
		.name =		"Matrox G400 CRTC2",
		.probe =	matroxfb_crtc2_probe,
		.remove =	matroxfb_crtc2_remove };

static int matroxfb_crtc2_init(void) {
	if (fb_get_options("matrox_crtc2fb", NULL))
		return -ENODEV;

	matroxfb_register_driver(&crtc2);
	return 0;
}

static void matroxfb_crtc2_exit(void) {
	matroxfb_unregister_driver(&crtc2);
}

MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
MODULE_DESCRIPTION("Matrox G400 CRTC2 driver");
MODULE_LICENSE("GPL");
module_init(matroxfb_crtc2_init);
module_exit(matroxfb_crtc2_exit);
/* we do not have __setup() yet */