summaryrefslogtreecommitdiff
path: root/drivers/video/fbdev/macfb.c
blob: 44ff860a3f3783210d0b54f1444e0aa4e0f8dd05 (plain)
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
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * macfb.c: Generic framebuffer for Macs whose colourmaps/modes we
 * don't know how to set.
 *
 * (c) 1999 David Huggins-Daines <dhd@debian.org>
 *
 * Primarily based on vesafb.c, by Gerd Knorr
 * (c) 1998 Gerd Knorr <kraxel@cs.tu-berlin.de>
 *
 * Also uses information and code from:
 *
 * The original macfb.c from Linux/mac68k 2.0, by Alan Cox, Juergen
 * Mellinger, Mikael Forselius, Michael Schmitz, and others.
 *
 * valkyriefb.c, by Martin Costabel, Kevin Schoedel, Barry Nathan, Dan
 * Jacobowitz, Paul Mackerras, Fabio Riccardi, and Geert Uytterhoeven.
 *
 * The VideoToolbox "Bugs" web page at
 * http://rajsky.psych.nyu.edu/Tips/VideoBugs.html
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/nubus.h>
#include <linux/init.h>
#include <linux/fb.h>

#include <asm/setup.h>
#include <asm/macintosh.h>
#include <asm/io.h>

/* Common DAC base address for the LC, RBV, Valkyrie, and IIvx */
#define DAC_BASE 0x50f24000

/* Some addresses for the DAFB */
#define DAFB_BASE 0xf9800200

/* Address for the built-in Civic framebuffer in Quadra AVs */
#define CIVIC_BASE 0x50f30800

/* GSC (Gray Scale Controller) base address */
#define GSC_BASE 0x50F20000

/* CSC (Color Screen Controller) base address */
#define CSC_BASE 0x50F20000

static int (*macfb_setpalette)(unsigned int regno, unsigned int red,
			       unsigned int green, unsigned int blue,
			       struct fb_info *info);

static struct {
	unsigned char addr;
	unsigned char lut;
} __iomem *v8_brazil_cmap_regs;

static struct {
	unsigned char addr;
	char pad1[3]; /* word aligned */
	unsigned char lut;
	char pad2[3]; /* word aligned */
	unsigned char cntl; /* a guess as to purpose */
} __iomem *rbv_cmap_regs;

static struct {
	unsigned long reset;
	unsigned long pad1[3];
	unsigned char pad2[3];
	unsigned char lut;
} __iomem *dafb_cmap_regs;

static struct {
	unsigned char addr;	/* OFFSET: 0x00 */
	unsigned char pad1[15];
	unsigned char lut;	/* OFFSET: 0x10 */
	unsigned char pad2[15];
	unsigned char status;	/* OFFSET: 0x20 */
	unsigned char pad3[7];
	unsigned long vbl_addr;	/* OFFSET: 0x28 */
	unsigned int  status2;	/* OFFSET: 0x2C */
} __iomem *civic_cmap_regs;

static struct {
	char pad1[0x40];
	unsigned char clut_waddr;	/* 0x40 */
	char pad2;
	unsigned char clut_data;	/* 0x42 */
	char pad3[0x3];
	unsigned char clut_raddr;	/* 0x46 */
} __iomem *csc_cmap_regs;

/* The registers in these structs are in NuBus slot space */
struct mdc_cmap_regs {
	char pad1[0x200200];
	unsigned char addr;
	char pad2[6];
	unsigned char lut;
};

struct toby_cmap_regs {
	char pad1[0x90018];
	unsigned char lut; /* TFBClutWDataReg, offset 0x90018 */
	char pad2[3];
	unsigned char addr; /* TFBClutAddrReg, offset 0x9001C */
};

struct jet_cmap_regs {
	char pad1[0xe0e000];
	unsigned char addr;
	unsigned char lut;
};

#define PIXEL_TO_MM(a)	(((a)*10)/28)	/* width in mm at 72 dpi */

static struct fb_var_screeninfo macfb_defined = {
	.activate	= FB_ACTIVATE_NOW,
	.right_margin	= 32,
	.upper_margin	= 16,
	.lower_margin	= 4,
	.vsync_len	= 4,
	.vmode		= FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo macfb_fix = {
	.type	= FB_TYPE_PACKED_PIXELS,
	.accel	= FB_ACCEL_NONE,
};

static void *slot_addr;
static struct fb_info fb_info;
static u32 pseudo_palette[16];
static int vidtest;

/*
 * Unlike the Valkyrie, the DAFB cannot set individual colormap
 * registers.  Therefore, we do what the MacOS driver does (no
 * kidding!) and simply set them one by one until we hit the one we
 * want.
 */
static int dafb_setpalette(unsigned int regno, unsigned int red,
			   unsigned int green, unsigned int blue,
			   struct fb_info *info)
{
	static int lastreg = -2;
	unsigned long flags;

	local_irq_save(flags);

	/*
	 * fbdev will set an entire colourmap, but X won't.  Hopefully
	 * this should accommodate both of them
	 */
	if (regno != lastreg + 1) {
		int i;

		/* Stab in the dark trying to reset the CLUT pointer */
		nubus_writel(0, &dafb_cmap_regs->reset);
		nop();

		/* Loop until we get to the register we want */
		for (i = 0; i < regno; i++) {
			nubus_writeb(info->cmap.red[i] >> 8,
				     &dafb_cmap_regs->lut);
			nop();
			nubus_writeb(info->cmap.green[i] >> 8,
				     &dafb_cmap_regs->lut);
			nop();
			nubus_writeb(info->cmap.blue[i] >> 8,
				     &dafb_cmap_regs->lut);
			nop();
		}
	}

	nubus_writeb(red, &dafb_cmap_regs->lut);
	nop();
	nubus_writeb(green, &dafb_cmap_regs->lut);
	nop();
	nubus_writeb(blue, &dafb_cmap_regs->lut);

	local_irq_restore(flags);
	lastreg = regno;
	return 0;
}

/* V8 and Brazil seem to use the same DAC.  Sonora does as well. */
static int v8_brazil_setpalette(unsigned int regno, unsigned int red,
				unsigned int green, unsigned int blue,
				struct fb_info *info)
{
	unsigned int bpp = info->var.bits_per_pixel;
	unsigned long flags;

	local_irq_save(flags);

	/* On these chips, the CLUT register numbers are spread out
	 * across the register space.  Thus:
	 * In 8bpp, all regnos are valid.
	 * In 4bpp, the regnos are 0x0f, 0x1f, 0x2f, etc, etc
	 * In 2bpp, the regnos are 0x3f, 0x7f, 0xbf, 0xff
	 */
	regno = (regno << (8 - bpp)) | (0xFF >> bpp);
	nubus_writeb(regno, &v8_brazil_cmap_regs->addr);
	nop();

	/* send one color channel at a time */
	nubus_writeb(red, &v8_brazil_cmap_regs->lut);
	nop();
	nubus_writeb(green, &v8_brazil_cmap_regs->lut);
	nop();
	nubus_writeb(blue, &v8_brazil_cmap_regs->lut);

	local_irq_restore(flags);
	return 0;
}

/* RAM-Based Video */
static int rbv_setpalette(unsigned int regno, unsigned int red,
			  unsigned int green, unsigned int blue,
			  struct fb_info *info)
{
	unsigned long flags;

	local_irq_save(flags);

	/* From the VideoToolbox driver.  Seems to be saying that
	 * regno #254 and #255 are the important ones for 1-bit color,
	 * regno #252-255 are the important ones for 2-bit color, etc.
	 */
	regno += 256 - (1 << info->var.bits_per_pixel);

	/* reset clut? (VideoToolbox sez "not necessary") */
	nubus_writeb(0xFF, &rbv_cmap_regs->cntl);
	nop();

	/* tell clut which address to use. */
	nubus_writeb(regno, &rbv_cmap_regs->addr);
	nop();

	/* send one color channel at a time. */
	nubus_writeb(red, &rbv_cmap_regs->lut);
	nop();
	nubus_writeb(green, &rbv_cmap_regs->lut);
	nop();
	nubus_writeb(blue, &rbv_cmap_regs->lut);

	local_irq_restore(flags);
	return 0;
}

/* Macintosh Display Card (8*24) */
static int mdc_setpalette(unsigned int regno, unsigned int red,
			  unsigned int green, unsigned int blue,
			  struct fb_info *info)
{
	struct mdc_cmap_regs *cmap_regs = slot_addr;
	unsigned long flags;

	local_irq_save(flags);

	/* the nop's are there to order writes. */
	nubus_writeb(regno, &cmap_regs->addr);
	nop();
	nubus_writeb(red, &cmap_regs->lut);
	nop();
	nubus_writeb(green, &cmap_regs->lut);
	nop();
	nubus_writeb(blue, &cmap_regs->lut);

	local_irq_restore(flags);
	return 0;
}

/* Toby frame buffer */
static int toby_setpalette(unsigned int regno, unsigned int red,
			   unsigned int green, unsigned int blue,
			   struct fb_info *info)
{
	struct toby_cmap_regs *cmap_regs = slot_addr;
	unsigned int bpp = info->var.bits_per_pixel;
	unsigned long flags;

	red = ~red;
	green = ~green;
	blue = ~blue;
	regno = (regno << (8 - bpp)) | (0xFF >> bpp);

	local_irq_save(flags);

	nubus_writeb(regno, &cmap_regs->addr);
	nop();
	nubus_writeb(red, &cmap_regs->lut);
	nop();
	nubus_writeb(green, &cmap_regs->lut);
	nop();
	nubus_writeb(blue, &cmap_regs->lut);

	local_irq_restore(flags);
	return 0;
}

/* Jet frame buffer */
static int jet_setpalette(unsigned int regno, unsigned int red,
			  unsigned int green, unsigned int blue,
			  struct fb_info *info)
{
	struct jet_cmap_regs *cmap_regs = slot_addr;
	unsigned long flags;

	local_irq_save(flags);

	nubus_writeb(regno, &cmap_regs->addr);
	nop();
	nubus_writeb(red, &cmap_regs->lut);
	nop();
	nubus_writeb(green, &cmap_regs->lut);
	nop();
	nubus_writeb(blue, &cmap_regs->lut);

	local_irq_restore(flags);
	return 0;
}

/*
 * Civic framebuffer -- Quadra AV built-in video.  A chip
 * called Sebastian holds the actual color palettes, and
 * apparently, there are two different banks of 512K RAM
 * which can act as separate framebuffers for doing video
 * input and viewing the screen at the same time!  The 840AV
 * Can add another 1MB RAM to give the two framebuffers
 * 1MB RAM apiece.
 */
static int civic_setpalette(unsigned int regno, unsigned int red,
			    unsigned int green, unsigned int blue,
			    struct fb_info *info)
{
	unsigned long flags;
	int clut_status;

	local_irq_save(flags);

	/* Set the register address */
	nubus_writeb(regno, &civic_cmap_regs->addr);
	nop();

	/*
	 * Grab a status word and do some checking;
	 * Then finally write the clut!
	 */
	clut_status =  nubus_readb(&civic_cmap_regs->status2);

	if ((clut_status & 0x0008) == 0)
	{
#if 0
		if ((clut_status & 0x000D) != 0)
		{
			nubus_writeb(0x00, &civic_cmap_regs->lut);
			nop();
			nubus_writeb(0x00, &civic_cmap_regs->lut);
			nop();
		}
#endif

		nubus_writeb(red, &civic_cmap_regs->lut);
		nop();
		nubus_writeb(green, &civic_cmap_regs->lut);
		nop();
		nubus_writeb(blue, &civic_cmap_regs->lut);
		nop();
		nubus_writeb(0x00, &civic_cmap_regs->lut);
	}
	else
	{
		unsigned char junk;

		junk = nubus_readb(&civic_cmap_regs->lut);
		nop();
		junk = nubus_readb(&civic_cmap_regs->lut);
		nop();
		junk = nubus_readb(&civic_cmap_regs->lut);
		nop();
		junk = nubus_readb(&civic_cmap_regs->lut);
		nop();

		if ((clut_status & 0x000D) != 0)
		{
			nubus_writeb(0x00, &civic_cmap_regs->lut);
			nop();
			nubus_writeb(0x00, &civic_cmap_regs->lut);
			nop();
		}

		nubus_writeb(red, &civic_cmap_regs->lut);
		nop();
		nubus_writeb(green, &civic_cmap_regs->lut);
		nop();
		nubus_writeb(blue, &civic_cmap_regs->lut);
		nop();
		nubus_writeb(junk, &civic_cmap_regs->lut);
	}

	local_irq_restore(flags);
	return 0;
}

/*
 * The CSC is the framebuffer on the PowerBook 190 series
 * (and the 5300 too, but that's a PowerMac). This function
 * brought to you in part by the ECSC driver for MkLinux.
 */
static int csc_setpalette(unsigned int regno, unsigned int red,
			  unsigned int green, unsigned int blue,
			  struct fb_info *info)
{
	unsigned long flags;

	local_irq_save(flags);

	udelay(1); /* mklinux on PB 5300 waits for 260 ns */
	nubus_writeb(regno, &csc_cmap_regs->clut_waddr);
	nubus_writeb(red, &csc_cmap_regs->clut_data);
	nubus_writeb(green, &csc_cmap_regs->clut_data);
	nubus_writeb(blue, &csc_cmap_regs->clut_data);

	local_irq_restore(flags);
	return 0;
}

static int macfb_setcolreg(unsigned regno, unsigned red, unsigned green,
			   unsigned blue, unsigned transp,
			   struct fb_info *fb_info)
{
	/*
	 * Set a single color register. The values supplied are
	 * already rounded down to the hardware's capabilities
	 * (according to the entries in the `var' structure).
	 * Return non-zero for invalid regno.
	 */

	if (regno >= fb_info->cmap.len)
		return 1;

	if (fb_info->var.bits_per_pixel <= 8) {
		switch (fb_info->var.bits_per_pixel) {
		case 1:
			/* We shouldn't get here */
			break;
		case 2:
		case 4:
		case 8:
			if (macfb_setpalette)
				macfb_setpalette(regno, red >> 8, green >> 8,
						 blue >> 8, fb_info);
			else
				return 1;
			break;
		}
	} else if (regno < 16) {
		switch (fb_info->var.bits_per_pixel) {
		case 16:
			if (fb_info->var.red.offset == 10) {
				/* 1:5:5:5 */
				((u32*) (fb_info->pseudo_palette))[regno] =
					((red   & 0xf800) >>  1) |
					((green & 0xf800) >>  6) |
					((blue  & 0xf800) >> 11) |
					((transp != 0) << 15);
			} else {
				/* 0:5:6:5 */
				((u32*) (fb_info->pseudo_palette))[regno] =
					((red   & 0xf800) >>  0) |
					((green & 0xfc00) >>  5) |
					((blue  & 0xf800) >> 11);
			}
			break;
		/*
		 * 24-bit colour almost doesn't exist on 68k Macs --
		 * https://support.apple.com/kb/TA28634 (Old Article: 10992)
		 */
		case 24:
		case 32:
			red   >>= 8;
			green >>= 8;
			blue  >>= 8;
			((u32 *)(fb_info->pseudo_palette))[regno] =
				(red   << fb_info->var.red.offset) |
				(green << fb_info->var.green.offset) |
				(blue  << fb_info->var.blue.offset);
			break;
		}
	}

	return 0;
}

static const struct fb_ops macfb_ops = {
	.owner		= THIS_MODULE,
	.fb_setcolreg	= macfb_setcolreg,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

static void __init macfb_setup(char *options)
{
	char *this_opt;

	if (!options || !*options)
		return;

	while ((this_opt = strsep(&options, ",")) != NULL) {
		if (!*this_opt)
			continue;

		if (!strcmp(this_opt, "inverse"))
			fb_invert_cmaps();
		else
			if (!strcmp(this_opt, "vidtest"))
				vidtest = 1; /* enable experimental CLUT code */
	}
}

static void __init iounmap_macfb(void)
{
	if (dafb_cmap_regs)
		iounmap(dafb_cmap_regs);
	if (v8_brazil_cmap_regs)
		iounmap(v8_brazil_cmap_regs);
	if (rbv_cmap_regs)
		iounmap(rbv_cmap_regs);
	if (civic_cmap_regs)
		iounmap(civic_cmap_regs);
	if (csc_cmap_regs)
		iounmap(csc_cmap_regs);
}

static int __init macfb_init(void)
{
	int video_cmap_len, video_is_nubus = 0;
	struct nubus_rsrc *ndev = NULL;
	char *option = NULL;
	int err;

	if (fb_get_options("macfb", &option))
		return -ENODEV;
	macfb_setup(option);

	if (!MACH_IS_MAC)
		return -ENODEV;

	if (mac_bi_data.id == MAC_MODEL_Q630 ||
	    mac_bi_data.id == MAC_MODEL_P588)
		return -ENODEV; /* See valkyriefb.c */

	macfb_defined.xres = mac_bi_data.dimensions & 0xFFFF;
	macfb_defined.yres = mac_bi_data.dimensions >> 16;
	macfb_defined.bits_per_pixel = mac_bi_data.videodepth;

	macfb_fix.line_length = mac_bi_data.videorow;
	macfb_fix.smem_len    = macfb_fix.line_length * macfb_defined.yres;
	/* Note: physical address (since 2.1.127) */
	macfb_fix.smem_start  = mac_bi_data.videoaddr;

	/*
	 * This is actually redundant with the initial mappings.
	 * However, there are some non-obvious aspects to the way
	 * those mappings are set up, so this is in fact the safest
	 * way to ensure that this driver will work on every possible Mac
	 */
	fb_info.screen_base = ioremap(mac_bi_data.videoaddr,
				      macfb_fix.smem_len);
	if (!fb_info.screen_base)
		return -ENODEV;

	pr_info("macfb: framebuffer at 0x%08lx, mapped to 0x%p, size %dk\n",
	        macfb_fix.smem_start, fb_info.screen_base,
	        macfb_fix.smem_len / 1024);
	pr_info("macfb: mode is %dx%dx%d, linelength=%d\n",
	        macfb_defined.xres, macfb_defined.yres,
	        macfb_defined.bits_per_pixel, macfb_fix.line_length);

	/* Fill in the available video resolution */
	macfb_defined.xres_virtual = macfb_defined.xres;
	macfb_defined.yres_virtual = macfb_defined.yres;
	macfb_defined.height       = PIXEL_TO_MM(macfb_defined.yres);
	macfb_defined.width        = PIXEL_TO_MM(macfb_defined.xres);

	/* Some dummy values for timing to make fbset happy */
	macfb_defined.pixclock     = 10000000 / macfb_defined.xres *
				     1000 / macfb_defined.yres;
	macfb_defined.left_margin  = (macfb_defined.xres / 8) & 0xf8;
	macfb_defined.hsync_len    = (macfb_defined.xres / 8) & 0xf8;

	switch (macfb_defined.bits_per_pixel) {
	case 1:
		macfb_defined.red.length = macfb_defined.bits_per_pixel;
		macfb_defined.green.length = macfb_defined.bits_per_pixel;
		macfb_defined.blue.length = macfb_defined.bits_per_pixel;
		video_cmap_len = 2;
		macfb_fix.visual = FB_VISUAL_MONO01;
		break;
	case 2:
	case 4:
	case 8:
		macfb_defined.red.length = macfb_defined.bits_per_pixel;
		macfb_defined.green.length = macfb_defined.bits_per_pixel;
		macfb_defined.blue.length = macfb_defined.bits_per_pixel;
		video_cmap_len = 1 << macfb_defined.bits_per_pixel;
		macfb_fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	case 16:
		macfb_defined.transp.offset = 15;
		macfb_defined.transp.length = 1;
		macfb_defined.red.offset = 10;
		macfb_defined.red.length = 5;
		macfb_defined.green.offset = 5;
		macfb_defined.green.length = 5;
		macfb_defined.blue.offset = 0;
		macfb_defined.blue.length = 5;
		video_cmap_len = 16;
		/*
		 * Should actually be FB_VISUAL_DIRECTCOLOR, but this
		 * works too
		 */
		macfb_fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 24:
	case 32:
		macfb_defined.red.offset = 16;
		macfb_defined.red.length = 8;
		macfb_defined.green.offset = 8;
		macfb_defined.green.length = 8;
		macfb_defined.blue.offset = 0;
		macfb_defined.blue.length = 8;
		video_cmap_len = 16;
		macfb_fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	default:
		pr_err("macfb: unknown or unsupported bit depth: %d\n",
		       macfb_defined.bits_per_pixel);
		err = -EINVAL;
		goto fail_unmap;
	}

	/*
	 * We take a wild guess that if the video physical address is
	 * in nubus slot space, that the nubus card is driving video.
	 * Penguin really ought to tell us whether we are using internal
	 * video or not.
	 * Hopefully we only find one of them.  Otherwise our NuBus
	 * code is really broken :-)
	 */

	for_each_func_rsrc(ndev) {
		unsigned long base = ndev->board->slot_addr;

		if (mac_bi_data.videoaddr < base ||
		    mac_bi_data.videoaddr - base > 0xFFFFFF)
			continue;

		if (ndev->category != NUBUS_CAT_DISPLAY ||
		    ndev->type != NUBUS_TYPE_VIDEO)
			continue;

		video_is_nubus = 1;
		slot_addr = (unsigned char *)base;

		switch(ndev->dr_hw) {
		case NUBUS_DRHW_APPLE_MDC:
			strcpy(macfb_fix.id, "Mac Disp. Card");
			macfb_setpalette = mdc_setpalette;
			break;
		case NUBUS_DRHW_APPLE_TFB:
			strcpy(macfb_fix.id, "Toby");
			macfb_setpalette = toby_setpalette;
			break;
		case NUBUS_DRHW_APPLE_JET:
			strcpy(macfb_fix.id, "Jet");
			macfb_setpalette = jet_setpalette;
			break;
		default:
			strcpy(macfb_fix.id, "Generic NuBus");
			break;
		}
	}

	/* If it's not a NuBus card, it must be internal video */
	if (!video_is_nubus)
		switch (mac_bi_data.id) {
		/*
		 * DAFB Quadras
		 * Note: these first four have the v7 DAFB, which is
		 * known to be rather unlike the ones used in the
		 * other models
		 */
		case MAC_MODEL_P475:
		case MAC_MODEL_P475F:
		case MAC_MODEL_P575:
		case MAC_MODEL_Q605:

		case MAC_MODEL_Q800:
		case MAC_MODEL_Q650:
		case MAC_MODEL_Q610:
		case MAC_MODEL_C650:
		case MAC_MODEL_C610:
		case MAC_MODEL_Q700:
		case MAC_MODEL_Q900:
		case MAC_MODEL_Q950:
			strcpy(macfb_fix.id, "DAFB");
			macfb_setpalette = dafb_setpalette;
			dafb_cmap_regs = ioremap(DAFB_BASE, 0x1000);
			break;

		/*
		 * LC II uses the V8 framebuffer
		 */
		case MAC_MODEL_LCII:
			strcpy(macfb_fix.id, "V8");
			macfb_setpalette = v8_brazil_setpalette;
			v8_brazil_cmap_regs = ioremap(DAC_BASE, 0x1000);
			break;

		/*
		 * IIvi, IIvx use the "Brazil" framebuffer (which is
		 * very much like the V8, it seems, and probably uses
		 * the same DAC)
		 */
		case MAC_MODEL_IIVI:
		case MAC_MODEL_IIVX:
		case MAC_MODEL_P600:
			strcpy(macfb_fix.id, "Brazil");
			macfb_setpalette = v8_brazil_setpalette;
			v8_brazil_cmap_regs = ioremap(DAC_BASE, 0x1000);
			break;

		/*
		 * LC III (and friends) use the Sonora framebuffer
		 * Incidentally this is also used in the non-AV models
		 * of the x100 PowerMacs
		 * These do in fact seem to use the same DAC interface
		 * as the LC II.
		 */
		case MAC_MODEL_LCIII:
		case MAC_MODEL_P520:
		case MAC_MODEL_P550:
		case MAC_MODEL_P460:
			strcpy(macfb_fix.id, "Sonora");
			macfb_setpalette = v8_brazil_setpalette;
			v8_brazil_cmap_regs = ioremap(DAC_BASE, 0x1000);
			break;

		/*
		 * IIci and IIsi use the infamous RBV chip
		 * (the IIsi is just a rebadged and crippled
		 * IIci in a different case, BTW)
		 */
		case MAC_MODEL_IICI:
		case MAC_MODEL_IISI:
			strcpy(macfb_fix.id, "RBV");
			macfb_setpalette = rbv_setpalette;
			rbv_cmap_regs = ioremap(DAC_BASE, 0x1000);
			break;

		/*
		 * AVs use the Civic framebuffer
		 */
		case MAC_MODEL_Q840:
		case MAC_MODEL_C660:
			strcpy(macfb_fix.id, "Civic");
			macfb_setpalette = civic_setpalette;
			civic_cmap_regs = ioremap(CIVIC_BASE, 0x1000);
			break;


		/*
		 * Assorted weirdos
		 * We think this may be like the LC II
		 */
		case MAC_MODEL_LC:
			strcpy(macfb_fix.id, "LC");
			if (vidtest) {
				macfb_setpalette = v8_brazil_setpalette;
				v8_brazil_cmap_regs =
					ioremap(DAC_BASE, 0x1000);
			}
			break;

		/*
		 * We think this may be like the LC II
		 */
		case MAC_MODEL_CCL:
			strcpy(macfb_fix.id, "Color Classic");
			if (vidtest) {
				macfb_setpalette = v8_brazil_setpalette;
				v8_brazil_cmap_regs =
					ioremap(DAC_BASE, 0x1000);
			}
			break;

		/*
		 * And we *do* mean "weirdos"
		 */
		case MAC_MODEL_TV:
			strcpy(macfb_fix.id, "Mac TV");
			break;

		/*
		 * These don't have colour, so no need to worry
		 */
		case MAC_MODEL_SE30:
		case MAC_MODEL_CLII:
			strcpy(macfb_fix.id, "Monochrome");
			break;

		/*
		 * Powerbooks are particularly difficult.  Many of
		 * them have separate framebuffers for external and
		 * internal video, which is admittedly pretty cool,
		 * but will be a bit of a headache to support here.
		 * Also, many of them are grayscale, and we don't
		 * really support that.
		 */

		/*
		 * Slot 0 ROM says TIM. No external video. B&W.
		 */
		case MAC_MODEL_PB140:
		case MAC_MODEL_PB145:
		case MAC_MODEL_PB170:
			strcpy(macfb_fix.id, "DDC");
			break;

		/*
		 * Internal is GSC, External (if present) is ViSC
		 */
		case MAC_MODEL_PB150:	/* no external video */
		case MAC_MODEL_PB160:
		case MAC_MODEL_PB165:
		case MAC_MODEL_PB180:
		case MAC_MODEL_PB210:
		case MAC_MODEL_PB230:
			strcpy(macfb_fix.id, "GSC");
			break;

		/*
		 * Internal is TIM, External is ViSC
		 */
		case MAC_MODEL_PB165C:
		case MAC_MODEL_PB180C:
			strcpy(macfb_fix.id, "TIM");
			break;

		/*
		 * Internal is CSC, External is Keystone+Ariel.
		 */
		case MAC_MODEL_PB190:	/* external video is optional */
		case MAC_MODEL_PB520:
		case MAC_MODEL_PB250:
		case MAC_MODEL_PB270C:
		case MAC_MODEL_PB280:
		case MAC_MODEL_PB280C:
			strcpy(macfb_fix.id, "CSC");
			macfb_setpalette = csc_setpalette;
			csc_cmap_regs = ioremap(CSC_BASE, 0x1000);
			break;

		default:
			strcpy(macfb_fix.id, "Unknown");
			break;
		}

	fb_info.fbops		= &macfb_ops;
	fb_info.var		= macfb_defined;
	fb_info.fix		= macfb_fix;
	fb_info.pseudo_palette	= pseudo_palette;
	fb_info.flags		= FBINFO_DEFAULT;

	err = fb_alloc_cmap(&fb_info.cmap, video_cmap_len, 0);
	if (err)
		goto fail_unmap;

	err = register_framebuffer(&fb_info);
	if (err)
		goto fail_dealloc;

	fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id);

	return 0;

fail_dealloc:
	fb_dealloc_cmap(&fb_info.cmap);
fail_unmap:
	iounmap(fb_info.screen_base);
	iounmap_macfb();
	return err;
}

module_init(macfb_init);
MODULE_LICENSE("GPL");