summaryrefslogtreecommitdiffstats
path: root/drivers/video/fbdev/acornfb.c
blob: a305caea58eea717fdffaac4c5364552673ad5ae (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
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
/*
 *  linux/drivers/video/acornfb.c
 *
 *  Copyright (C) 1998-2001 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Frame buffer code for Acorn platforms
 *
 * NOTE: Most of the modes with X!=640 will disappear shortly.
 * NOTE: Startup setting of HS & VS polarity not supported.
 *       (do we need to support it if we're coming up in 640x480?)
 *
 * FIXME: (things broken by the "new improved" FBCON API)
 *  - Blanking 8bpp displays with VIDC
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/gfp.h>

#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <asm/pgtable.h>

#include "acornfb.h"

/*
 * Default resolution.
 * NOTE that it has to be supported in the table towards
 * the end of this file.
 */
#define DEFAULT_XRES	640
#define DEFAULT_YRES	480
#define DEFAULT_BPP	4

/*
 * define this to debug the video mode selection
 */
#undef DEBUG_MODE_SELECTION

/*
 * Translation from RISC OS monitor types to actual
 * HSYNC and VSYNC frequency ranges.  These are
 * probably not right, but they're the best info I
 * have.  Allow 1% either way on the nominal for TVs.
 */
#define NR_MONTYPES	6
static struct fb_monspecs monspecs[NR_MONTYPES] = {
	{	/* TV		*/
		.hfmin	= 15469,
		.hfmax	= 15781,
		.vfmin	= 49,
		.vfmax	= 51,
	}, {	/* Multi Freq	*/
		.hfmin	= 0,
		.hfmax	= 99999,
		.vfmin	= 0,
		.vfmax	= 199,
	}, {	/* Hi-res mono	*/
		.hfmin	= 58608,
		.hfmax	= 58608,
		.vfmin	= 64,
		.vfmax	= 64,
	}, {	/* VGA		*/
		.hfmin	= 30000,
		.hfmax	= 70000,
		.vfmin	= 60,
		.vfmax	= 60,
	}, {	/* SVGA		*/
		.hfmin	= 30000,
		.hfmax	= 70000,
		.vfmin	= 56,
		.vfmax	= 75,
	}, {
		.hfmin	= 30000,
		.hfmax	= 70000,
		.vfmin	= 60,
		.vfmax	= 60,
	}
};

static struct fb_info fb_info;
static struct acornfb_par current_par;
static struct vidc_timing current_vidc;

extern unsigned int vram_size;	/* set by setup.c */

#ifdef HAS_VIDC20
#include <mach/acornfb.h>

#define MAX_SIZE	2*1024*1024

/* VIDC20 has a different set of rules from the VIDC:
 *  hcr  : must be multiple of 4
 *  hswr : must be even
 *  hdsr : must be even
 *  hder : must be even
 *  vcr  : >= 2, (interlace, must be odd)
 *  vswr : >= 1
 *  vdsr : >= 1
 *  vder : >= vdsr
 */
static void acornfb_set_timing(struct fb_info *info)
{
	struct fb_var_screeninfo *var = &info->var;
	struct vidc_timing vidc;
	u_int vcr, fsize;
	u_int ext_ctl, dat_ctl;
	u_int words_per_line;

	memset(&vidc, 0, sizeof(vidc));

	vidc.h_sync_width	= var->hsync_len - 8;
	vidc.h_border_start	= vidc.h_sync_width + var->left_margin + 8 - 12;
	vidc.h_display_start	= vidc.h_border_start + 12 - 18;
	vidc.h_display_end	= vidc.h_display_start + var->xres;
	vidc.h_border_end	= vidc.h_display_end + 18 - 12;
	vidc.h_cycle		= vidc.h_border_end + var->right_margin + 12 - 8;
	vidc.h_interlace	= vidc.h_cycle / 2;
	vidc.v_sync_width	= var->vsync_len - 1;
	vidc.v_border_start	= vidc.v_sync_width + var->upper_margin;
	vidc.v_display_start	= vidc.v_border_start;
	vidc.v_display_end	= vidc.v_display_start + var->yres;
	vidc.v_border_end	= vidc.v_display_end;
	vidc.control		= acornfb_default_control();

	vcr = var->vsync_len + var->upper_margin + var->yres +
	      var->lower_margin;

	if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED) {
		vidc.v_cycle = (vcr - 3) / 2;
		vidc.control |= VIDC20_CTRL_INT;
	} else
		vidc.v_cycle = vcr - 2;

	switch (var->bits_per_pixel) {
	case  1: vidc.control |= VIDC20_CTRL_1BPP;	break;
	case  2: vidc.control |= VIDC20_CTRL_2BPP;	break;
	case  4: vidc.control |= VIDC20_CTRL_4BPP;	break;
	default:
	case  8: vidc.control |= VIDC20_CTRL_8BPP;	break;
	case 16: vidc.control |= VIDC20_CTRL_16BPP;	break;
	case 32: vidc.control |= VIDC20_CTRL_32BPP;	break;
	}

	acornfb_vidc20_find_rates(&vidc, var);
	fsize = var->vsync_len + var->upper_margin + var->lower_margin - 1;

	if (memcmp(&current_vidc, &vidc, sizeof(vidc))) {
		current_vidc = vidc;

		vidc_writel(VIDC20_CTRL| vidc.control);
		vidc_writel(0xd0000000 | vidc.pll_ctl);
		vidc_writel(0x80000000 | vidc.h_cycle);
		vidc_writel(0x81000000 | vidc.h_sync_width);
		vidc_writel(0x82000000 | vidc.h_border_start);
		vidc_writel(0x83000000 | vidc.h_display_start);
		vidc_writel(0x84000000 | vidc.h_display_end);
		vidc_writel(0x85000000 | vidc.h_border_end);
		vidc_writel(0x86000000);
		vidc_writel(0x87000000 | vidc.h_interlace);
		vidc_writel(0x90000000 | vidc.v_cycle);
		vidc_writel(0x91000000 | vidc.v_sync_width);
		vidc_writel(0x92000000 | vidc.v_border_start);
		vidc_writel(0x93000000 | vidc.v_display_start);
		vidc_writel(0x94000000 | vidc.v_display_end);
		vidc_writel(0x95000000 | vidc.v_border_end);
		vidc_writel(0x96000000);
		vidc_writel(0x97000000);
	}

	iomd_writel(fsize, IOMD_FSIZE);

	ext_ctl = acornfb_default_econtrol();

	if (var->sync & FB_SYNC_COMP_HIGH_ACT) /* should be FB_SYNC_COMP */
		ext_ctl |= VIDC20_ECTL_HS_NCSYNC | VIDC20_ECTL_VS_NCSYNC;
	else {
		if (var->sync & FB_SYNC_HOR_HIGH_ACT)
			ext_ctl |= VIDC20_ECTL_HS_HSYNC;
		else
			ext_ctl |= VIDC20_ECTL_HS_NHSYNC;

		if (var->sync & FB_SYNC_VERT_HIGH_ACT)
			ext_ctl |= VIDC20_ECTL_VS_VSYNC;
		else
			ext_ctl |= VIDC20_ECTL_VS_NVSYNC;
	}

	vidc_writel(VIDC20_ECTL | ext_ctl);

	words_per_line = var->xres * var->bits_per_pixel / 32;

	if (current_par.using_vram && info->fix.smem_len == 2048*1024)
		words_per_line /= 2;

	/* RiscPC doesn't use the VIDC's VRAM control. */
	dat_ctl = VIDC20_DCTL_VRAM_DIS | VIDC20_DCTL_SNA | words_per_line;

	/* The data bus width is dependent on both the type
	 * and amount of video memory.
	 *     DRAM	32bit low
	 * 1MB VRAM	32bit
	 * 2MB VRAM	64bit
	 */
	if (current_par.using_vram && current_par.vram_half_sam == 2048)
		dat_ctl |= VIDC20_DCTL_BUS_D63_0;
	else
		dat_ctl |= VIDC20_DCTL_BUS_D31_0;

	vidc_writel(VIDC20_DCTL | dat_ctl);

#ifdef DEBUG_MODE_SELECTION
	printk(KERN_DEBUG "VIDC registers for %dx%dx%d:\n", var->xres,
	       var->yres, var->bits_per_pixel);
	printk(KERN_DEBUG " H-cycle          : %d\n", vidc.h_cycle);
	printk(KERN_DEBUG " H-sync-width     : %d\n", vidc.h_sync_width);
	printk(KERN_DEBUG " H-border-start   : %d\n", vidc.h_border_start);
	printk(KERN_DEBUG " H-display-start  : %d\n", vidc.h_display_start);
	printk(KERN_DEBUG " H-display-end    : %d\n", vidc.h_display_end);
	printk(KERN_DEBUG " H-border-end     : %d\n", vidc.h_border_end);
	printk(KERN_DEBUG " H-interlace      : %d\n", vidc.h_interlace);
	printk(KERN_DEBUG " V-cycle          : %d\n", vidc.v_cycle);
	printk(KERN_DEBUG " V-sync-width     : %d\n", vidc.v_sync_width);
	printk(KERN_DEBUG " V-border-start   : %d\n", vidc.v_border_start);
	printk(KERN_DEBUG " V-display-start  : %d\n", vidc.v_display_start);
	printk(KERN_DEBUG " V-display-end    : %d\n", vidc.v_display_end);
	printk(KERN_DEBUG " V-border-end     : %d\n", vidc.v_border_end);
	printk(KERN_DEBUG " Ext Ctrl  (C)    : 0x%08X\n", ext_ctl);
	printk(KERN_DEBUG " PLL Ctrl  (D)    : 0x%08X\n", vidc.pll_ctl);
	printk(KERN_DEBUG " Ctrl      (E)    : 0x%08X\n", vidc.control);
	printk(KERN_DEBUG " Data Ctrl (F)    : 0x%08X\n", dat_ctl);
	printk(KERN_DEBUG " Fsize            : 0x%08X\n", fsize);
#endif
}

/*
 * We have to take note of the VIDC20's 16-bit palette here.
 * The VIDC20 looks up a 16 bit pixel as follows:
 *
 *   bits   111111
 *          5432109876543210
 *   red            ++++++++  (8 bits,  7 to 0)
 *  green       ++++++++      (8 bits, 11 to 4)
 *   blue   ++++++++          (8 bits, 15 to 8)
 *
 * We use a pixel which looks like:
 *
 *   bits   111111
 *          5432109876543210
 *   red               +++++  (5 bits,  4 to  0)
 *  green         +++++       (5 bits,  9 to  5)
 *   blue    +++++            (5 bits, 14 to 10)
 */
static int
acornfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
		  u_int trans, struct fb_info *info)
{
	union palette pal;

	if (regno >= current_par.palette_size)
		return 1;

	if (regno < 16 && info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
		u32 pseudo_val;

		pseudo_val  = regno << info->var.red.offset;
		pseudo_val |= regno << info->var.green.offset;
		pseudo_val |= regno << info->var.blue.offset;

		((u32 *)info->pseudo_palette)[regno] = pseudo_val;
	}

	pal.p = 0;
	pal.vidc20.red   = red >> 8;
	pal.vidc20.green = green >> 8;
	pal.vidc20.blue  = blue >> 8;

	current_par.palette[regno] = pal;

	if (info->var.bits_per_pixel == 16) {
		int i;

		pal.p = 0;
		vidc_writel(0x10000000);
		for (i = 0; i < 256; i += 1) {
			pal.vidc20.red   = current_par.palette[ i       & 31].vidc20.red;
			pal.vidc20.green = current_par.palette[(i >> 1) & 31].vidc20.green;
			pal.vidc20.blue  = current_par.palette[(i >> 2) & 31].vidc20.blue;
			vidc_writel(pal.p);
			/* Palette register pointer auto-increments */
		}
	} else {
		vidc_writel(0x10000000 | regno);
		vidc_writel(pal.p);
	}

	return 0;
}
#endif

/*
 * Before selecting the timing parameters, adjust
 * the resolution to fit the rules.
 */
static int
acornfb_adjust_timing(struct fb_info *info, struct fb_var_screeninfo *var, u_int fontht)
{
	u_int font_line_len, sam_size, min_size, size, nr_y;

	/* xres must be even */
	var->xres = (var->xres + 1) & ~1;

	/*
	 * We don't allow xres_virtual to differ from xres
	 */
	var->xres_virtual = var->xres;
	var->xoffset = 0;

	if (current_par.using_vram)
		sam_size = current_par.vram_half_sam * 2;
	else
		sam_size = 16;

	/*
	 * Now, find a value for yres_virtual which allows
	 * us to do ywrap scrolling.  The value of
	 * yres_virtual must be such that the end of the
	 * displayable frame buffer must be aligned with
	 * the start of a font line.
	 */
	font_line_len = var->xres * var->bits_per_pixel * fontht / 8;
	min_size = var->xres * var->yres * var->bits_per_pixel / 8;

	/*
	 * If minimum screen size is greater than that we have
	 * available, reject it.
	 */
	if (min_size > info->fix.smem_len)
		return -EINVAL;

	/* Find int 'y', such that y * fll == s * sam < maxsize
	 * y = s * sam / fll; s = maxsize / sam
	 */
	for (size = info->fix.smem_len;
	     nr_y = size / font_line_len, min_size <= size;
	     size -= sam_size) {
		if (nr_y * font_line_len == size)
			break;
	}
	nr_y *= fontht;

	if (var->accel_flags & FB_ACCELF_TEXT) {
		if (min_size > size) {
			/*
			 * failed, use ypan
			 */
			size = info->fix.smem_len;
			var->yres_virtual = size / (font_line_len / fontht);
		} else
			var->yres_virtual = nr_y;
	} else if (var->yres_virtual > nr_y)
		var->yres_virtual = nr_y;

	current_par.screen_end = info->fix.smem_start + size;

	/*
	 * Fix yres & yoffset if needed.
	 */
	if (var->yres > var->yres_virtual)
		var->yres = var->yres_virtual;

	if (var->vmode & FB_VMODE_YWRAP) {
		if (var->yoffset > var->yres_virtual)
			var->yoffset = var->yres_virtual;
	} else {
		if (var->yoffset + var->yres > var->yres_virtual)
			var->yoffset = var->yres_virtual - var->yres;
	}

	/* hsync_len must be even */
	var->hsync_len = (var->hsync_len + 1) & ~1;

#if defined(HAS_VIDC20)
	/* left_margin must be even */
	if (var->left_margin & 1) {
		var->left_margin += 1;
		var->right_margin -= 1;
	}

	/* right_margin must be even */
	if (var->right_margin & 1)
		var->right_margin += 1;
#endif

	if (var->vsync_len < 1)
		var->vsync_len = 1;

	return 0;
}

static int
acornfb_validate_timing(struct fb_var_screeninfo *var,
			struct fb_monspecs *monspecs)
{
	unsigned long hs, vs;

	/*
	 * hs(Hz) = 10^12 / (pixclock * xtotal)
	 * vs(Hz) = hs(Hz) / ytotal
	 *
	 * No need to do long long divisions or anything
	 * like that if you factor it correctly
	 */
	hs = 1953125000 / var->pixclock;
	hs = hs * 512 /
	     (var->xres + var->left_margin + var->right_margin + var->hsync_len);
	vs = hs /
	     (var->yres + var->upper_margin + var->lower_margin + var->vsync_len);

	return (vs >= monspecs->vfmin && vs <= monspecs->vfmax &&
		hs >= monspecs->hfmin && hs <= monspecs->hfmax) ? 0 : -EINVAL;
}

static inline void
acornfb_update_dma(struct fb_info *info, struct fb_var_screeninfo *var)
{
	u_int off = var->yoffset * info->fix.line_length;

#if defined(HAS_MEMC)
	memc_write(VDMA_INIT, off >> 2);
#elif defined(HAS_IOMD)
	iomd_writel(info->fix.smem_start + off, IOMD_VIDINIT);
#endif
}

static int
acornfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	u_int fontht;
	int err;

	/*
	 * FIXME: Find the font height
	 */
	fontht = 8;

	var->red.msb_right = 0;
	var->green.msb_right = 0;
	var->blue.msb_right = 0;
	var->transp.msb_right = 0;

	switch (var->bits_per_pixel) {
	case 1:	case 2:	case 4:	case 8:
		var->red.offset    = 0;
		var->red.length    = var->bits_per_pixel;
		var->green         = var->red;
		var->blue          = var->red;
		var->transp.offset = 0;
		var->transp.length = 0;
		break;

#ifdef HAS_VIDC20
	case 16:
		var->red.offset    = 0;
		var->red.length    = 5;
		var->green.offset  = 5;
		var->green.length  = 5;
		var->blue.offset   = 10;
		var->blue.length   = 5;
		var->transp.offset = 15;
		var->transp.length = 1;
		break;

	case 32:
		var->red.offset    = 0;
		var->red.length    = 8;
		var->green.offset  = 8;
		var->green.length  = 8;
		var->blue.offset   = 16;
		var->blue.length   = 8;
		var->transp.offset = 24;
		var->transp.length = 4;
		break;
#endif
	default:
		return -EINVAL;
	}

	/*
	 * Check to see if the pixel rate is valid.
	 */
	if (!acornfb_valid_pixrate(var))
		return -EINVAL;

	/*
	 * Validate and adjust the resolution to
	 * match the video generator hardware.
	 */
	err = acornfb_adjust_timing(info, var, fontht);
	if (err)
		return err;

	/*
	 * Validate the timing against the
	 * monitor hardware.
	 */
	return acornfb_validate_timing(var, &info->monspecs);
}

static int acornfb_set_par(struct fb_info *info)
{
	switch (info->var.bits_per_pixel) {
	case 1:
		current_par.palette_size = 2;
		info->fix.visual = FB_VISUAL_MONO10;
		break;
	case 2:
		current_par.palette_size = 4;
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	case 4:
		current_par.palette_size = 16;
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	case 8:
		current_par.palette_size = VIDC_PALETTE_SIZE;
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
#ifdef HAS_VIDC20
	case 16:
		current_par.palette_size = 32;
		info->fix.visual = FB_VISUAL_DIRECTCOLOR;
		break;
	case 32:
		current_par.palette_size = VIDC_PALETTE_SIZE;
		info->fix.visual = FB_VISUAL_DIRECTCOLOR;
		break;
#endif
	default:
		BUG();
	}

	info->fix.line_length	= (info->var.xres * info->var.bits_per_pixel) / 8;

#if defined(HAS_MEMC)
	{
		unsigned long size = info->fix.smem_len - VDMA_XFERSIZE;

		memc_write(VDMA_START, 0);
		memc_write(VDMA_END, size >> 2);
	}
#elif defined(HAS_IOMD)
	{
		unsigned long start, size;
		u_int control;

		start = info->fix.smem_start;
		size  = current_par.screen_end;

		if (current_par.using_vram) {
			size -= current_par.vram_half_sam;
			control = DMA_CR_E | (current_par.vram_half_sam / 256);
		} else {
			size -= 16;
			control = DMA_CR_E | DMA_CR_D | 16;
		}

		iomd_writel(start,   IOMD_VIDSTART);
		iomd_writel(size,    IOMD_VIDEND);
		iomd_writel(control, IOMD_VIDCR);
	}
#endif

	acornfb_update_dma(info, &info->var);
	acornfb_set_timing(info);

	return 0;
}

static int
acornfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
{
	u_int y_bottom = var->yoffset;

	if (!(var->vmode & FB_VMODE_YWRAP))
		y_bottom += info->var.yres;

	if (y_bottom > info->var.yres_virtual)
		return -EINVAL;

	acornfb_update_dma(info, var);

	return 0;
}

static struct fb_ops acornfb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= acornfb_check_var,
	.fb_set_par	= acornfb_set_par,
	.fb_setcolreg	= acornfb_setcolreg,
	.fb_pan_display	= acornfb_pan_display,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

/*
 * Everything after here is initialisation!!!
 */
static struct fb_videomode modedb[] = {
	{	/* 320x256 @ 50Hz */
		NULL, 50,  320,  256, 125000,  92,  62,  35, 19,  38, 2,
		FB_SYNC_COMP_HIGH_ACT,
		FB_VMODE_NONINTERLACED
	}, {	/* 640x250 @ 50Hz, 15.6 kHz hsync */
		NULL, 50,  640,  250,  62500, 185, 123,  38, 21,  76, 3,
		0,
		FB_VMODE_NONINTERLACED
	}, {	/* 640x256 @ 50Hz, 15.6 kHz hsync */
		NULL, 50,  640,  256,  62500, 185, 123,  35, 18,  76, 3,
		0,
		FB_VMODE_NONINTERLACED
	}, {	/* 640x512 @ 50Hz, 26.8 kHz hsync */
		NULL, 50,  640,  512,  41667, 113,  87,  18,  1,  56, 3,
		0,
		FB_VMODE_NONINTERLACED
	}, {	/* 640x250 @ 70Hz, 31.5 kHz hsync */
		NULL, 70,  640,  250,  39722,  48,  16, 109, 88,  96, 2,
		0,
		FB_VMODE_NONINTERLACED
	}, {	/* 640x256 @ 70Hz, 31.5 kHz hsync */
		NULL, 70,  640,  256,  39722,  48,  16, 106, 85,  96, 2,
		0,
		FB_VMODE_NONINTERLACED
	}, {	/* 640x352 @ 70Hz, 31.5 kHz hsync */
		NULL, 70,  640,  352,  39722,  48,  16,  58, 37,  96, 2,
		0,
		FB_VMODE_NONINTERLACED
	}, {	/* 640x480 @ 60Hz, 31.5 kHz hsync */
		NULL, 60,  640,  480,  39722,  48,  16,  32, 11,  96, 2,
		0,
		FB_VMODE_NONINTERLACED
	}, {	/* 800x600 @ 56Hz, 35.2 kHz hsync */
		NULL, 56,  800,  600,  27778, 101,  23,  22,  1, 100, 2,
		0,
		FB_VMODE_NONINTERLACED
	}, {	/* 896x352 @ 60Hz, 21.8 kHz hsync */
		NULL, 60,  896,  352,  41667,  59,  27,   9,  0, 118, 3,
		0,
		FB_VMODE_NONINTERLACED
	}, {	/* 1024x 768 @ 60Hz, 48.4 kHz hsync */
		NULL, 60, 1024,  768,  15385, 160,  24,  29,  3, 136, 6,
		0,
		FB_VMODE_NONINTERLACED
	}, {	/* 1280x1024 @ 60Hz, 63.8 kHz hsync */
		NULL, 60, 1280, 1024,   9090, 186,  96,  38,  1, 160, 3,
		0,
		FB_VMODE_NONINTERLACED
	}
};

static struct fb_videomode acornfb_default_mode = {
	.name =		NULL,
	.refresh =	60,
	.xres =		640,
	.yres =		480,
	.pixclock =	39722,
	.left_margin =	56,
	.right_margin =	16,
	.upper_margin =	34,
	.lower_margin =	9,
	.hsync_len =	88,
	.vsync_len =	2,
	.sync =		0,
	.vmode =	FB_VMODE_NONINTERLACED
};

static void acornfb_init_fbinfo(void)
{
	static int first = 1;

	if (!first)
		return;
	first = 0;

	fb_info.fbops		= &acornfb_ops;
	fb_info.flags		= FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
	fb_info.pseudo_palette	= current_par.pseudo_palette;

	strcpy(fb_info.fix.id, "Acorn");
	fb_info.fix.type	= FB_TYPE_PACKED_PIXELS;
	fb_info.fix.type_aux	= 0;
	fb_info.fix.xpanstep	= 0;
	fb_info.fix.ypanstep	= 1;
	fb_info.fix.ywrapstep	= 1;
	fb_info.fix.line_length	= 0;
	fb_info.fix.accel	= FB_ACCEL_NONE;

	/*
	 * setup initial parameters
	 */
	memset(&fb_info.var, 0, sizeof(fb_info.var));

#if defined(HAS_VIDC20)
	fb_info.var.red.length	   = 8;
	fb_info.var.transp.length  = 4;
#endif
	fb_info.var.green	   = fb_info.var.red;
	fb_info.var.blue	   = fb_info.var.red;
	fb_info.var.nonstd	   = 0;
	fb_info.var.activate	   = FB_ACTIVATE_NOW;
	fb_info.var.height	   = -1;
	fb_info.var.width	   = -1;
	fb_info.var.vmode	   = FB_VMODE_NONINTERLACED;
	fb_info.var.accel_flags	   = FB_ACCELF_TEXT;

	current_par.dram_size	   = 0;
	current_par.montype	   = -1;
	current_par.dpms	   = 0;
}

/*
 * setup acornfb options:
 *
 *  mon:hmin-hmax:vmin-vmax:dpms:width:height
 *	Set monitor parameters:
 *		hmin   = horizontal minimum frequency (Hz)
 *		hmax   = horizontal maximum frequency (Hz)	(optional)
 *		vmin   = vertical minimum frequency (Hz)
 *		vmax   = vertical maximum frequency (Hz)	(optional)
 *		dpms   = DPMS supported?			(optional)
 *		width  = width of picture in mm.		(optional)
 *		height = height of picture in mm.		(optional)
 *
 * montype:type
 *	Set RISC-OS style monitor type:
 *		0 (or tv)	- TV frequency
 *		1 (or multi)	- Multi frequency
 *		2 (or hires)	- Hi-res monochrome
 *		3 (or vga)	- VGA
 *		4 (or svga)	- SVGA
 *		auto, or option missing
 *				- try hardware detect
 *
 * dram:size
 *	Set the amount of DRAM to use for the frame buffer
 *	(even if you have VRAM).
 *	size can optionally be followed by 'M' or 'K' for
 *	MB or KB respectively.
 */
static void acornfb_parse_mon(char *opt)
{
	char *p = opt;

	current_par.montype = -2;

	fb_info.monspecs.hfmin = simple_strtoul(p, &p, 0);
	if (*p == '-')
		fb_info.monspecs.hfmax = simple_strtoul(p + 1, &p, 0);
	else
		fb_info.monspecs.hfmax = fb_info.monspecs.hfmin;

	if (*p != ':')
		goto bad;

	fb_info.monspecs.vfmin = simple_strtoul(p + 1, &p, 0);
	if (*p == '-')
		fb_info.monspecs.vfmax = simple_strtoul(p + 1, &p, 0);
	else
		fb_info.monspecs.vfmax = fb_info.monspecs.vfmin;

	if (*p != ':')
		goto check_values;

	fb_info.monspecs.dpms = simple_strtoul(p + 1, &p, 0);

	if (*p != ':')
		goto check_values;

	fb_info.var.width = simple_strtoul(p + 1, &p, 0);

	if (*p != ':')
		goto check_values;

	fb_info.var.height = simple_strtoul(p + 1, NULL, 0);

check_values:
	if (fb_info.monspecs.hfmax < fb_info.monspecs.hfmin ||
	    fb_info.monspecs.vfmax < fb_info.monspecs.vfmin)
		goto bad;
	return;

bad:
	printk(KERN_ERR "Acornfb: bad monitor settings: %s\n", opt);
	current_par.montype = -1;
}

static void acornfb_parse_montype(char *opt)
{
	current_par.montype = -2;

	if (strncmp(opt, "tv", 2) == 0) {
		opt += 2;
		current_par.montype = 0;
	} else if (strncmp(opt, "multi", 5) == 0) {
		opt += 5;
		current_par.montype = 1;
	} else if (strncmp(opt, "hires", 5) == 0) {
		opt += 5;
		current_par.montype = 2;
	} else if (strncmp(opt, "vga", 3) == 0) {
		opt += 3;
		current_par.montype = 3;
	} else if (strncmp(opt, "svga", 4) == 0) {
		opt += 4;
		current_par.montype = 4;
	} else if (strncmp(opt, "auto", 4) == 0) {
		opt += 4;
		current_par.montype = -1;
	} else if (isdigit(*opt))
		current_par.montype = simple_strtoul(opt, &opt, 0);

	if (current_par.montype == -2 ||
	    current_par.montype > NR_MONTYPES) {
		printk(KERN_ERR "acornfb: unknown monitor type: %s\n",
			opt);
		current_par.montype = -1;
	} else
	if (opt && *opt) {
		if (strcmp(opt, ",dpms") == 0)
			current_par.dpms = 1;
		else
			printk(KERN_ERR
			       "acornfb: unknown monitor option: %s\n",
			       opt);
	}
}

static void acornfb_parse_dram(char *opt)
{
	unsigned int size;

	size = simple_strtoul(opt, &opt, 0);

	if (opt) {
		switch (*opt) {
		case 'M':
		case 'm':
			size *= 1024;
		case 'K':
		case 'k':
			size *= 1024;
		default:
			break;
		}
	}

	current_par.dram_size = size;
}

static struct options {
	char *name;
	void (*parse)(char *opt);
} opt_table[] = {
	{ "mon",     acornfb_parse_mon     },
	{ "montype", acornfb_parse_montype },
	{ "dram",    acornfb_parse_dram    },
	{ NULL, NULL }
};

static int acornfb_setup(char *options)
{
	struct options *optp;
	char *opt;

	if (!options || !*options)
		return 0;

	acornfb_init_fbinfo();

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

		for (optp = opt_table; optp->name; optp++) {
			int optlen;

			optlen = strlen(optp->name);

			if (strncmp(opt, optp->name, optlen) == 0 &&
			    opt[optlen] == ':') {
				optp->parse(opt + optlen + 1);
				break;
			}
		}

		if (!optp->name)
			printk(KERN_ERR "acornfb: unknown parameter: %s\n",
			       opt);
	}
	return 0;
}

/*
 * Detect type of monitor connected
 *  For now, we just assume SVGA
 */
static int acornfb_detect_monitortype(void)
{
	return 4;
}

/*
 * This enables the unused memory to be freed on older Acorn machines.
 * We are freeing memory on behalf of the architecture initialisation
 * code here.
 */
static inline void
free_unused_pages(unsigned int virtual_start, unsigned int virtual_end)
{
	int mb_freed = 0;

	/*
	 * Align addresses
	 */
	virtual_start = PAGE_ALIGN(virtual_start);
	virtual_end = PAGE_ALIGN(virtual_end);

	while (virtual_start < virtual_end) {
		struct page *page;

		/*
		 * Clear page reserved bit,
		 * set count to 1, and free
		 * the page.
		 */
		page = virt_to_page(virtual_start);
		__free_reserved_page(page);

		virtual_start += PAGE_SIZE;
		mb_freed += PAGE_SIZE / 1024;
	}

	printk("acornfb: freed %dK memory\n", mb_freed);
}

static int acornfb_probe(struct platform_device *dev)
{
	unsigned long size;
	u_int h_sync, v_sync;
	int rc, i;
	char *option = NULL;

	if (fb_get_options("acornfb", &option))
		return -ENODEV;
	acornfb_setup(option);

	acornfb_init_fbinfo();

	current_par.dev = &dev->dev;

	if (current_par.montype == -1)
		current_par.montype = acornfb_detect_monitortype();

	if (current_par.montype == -1 || current_par.montype > NR_MONTYPES)
		current_par.montype = 4;

	if (current_par.montype >= 0) {
		fb_info.monspecs = monspecs[current_par.montype];
		fb_info.monspecs.dpms = current_par.dpms;
	}

	/*
	 * Try to select a suitable default mode
	 */
	for (i = 0; i < ARRAY_SIZE(modedb); i++) {
		unsigned long hs;

		hs = modedb[i].refresh *
		     (modedb[i].yres + modedb[i].upper_margin +
		      modedb[i].lower_margin + modedb[i].vsync_len);
		if (modedb[i].xres == DEFAULT_XRES &&
		    modedb[i].yres == DEFAULT_YRES &&
		    modedb[i].refresh >= fb_info.monspecs.vfmin &&
		    modedb[i].refresh <= fb_info.monspecs.vfmax &&
		    hs                >= fb_info.monspecs.hfmin &&
		    hs                <= fb_info.monspecs.hfmax) {
			acornfb_default_mode = modedb[i];
			break;
		}
	}

	fb_info.screen_base    = (char *)SCREEN_BASE;
	fb_info.fix.smem_start = SCREEN_START;
	current_par.using_vram = 0;

	/*
	 * If vram_size is set, we are using VRAM in
	 * a Risc PC.  However, if the user has specified
	 * an amount of DRAM then use that instead.
	 */
	if (vram_size && !current_par.dram_size) {
		size = vram_size;
		current_par.vram_half_sam = vram_size / 1024;
		current_par.using_vram = 1;
	} else if (current_par.dram_size)
		size = current_par.dram_size;
	else
		size = MAX_SIZE;

	/*
	 * Limit maximum screen size.
	 */
	if (size > MAX_SIZE)
		size = MAX_SIZE;

	size = PAGE_ALIGN(size);

#if defined(HAS_VIDC20)
	if (!current_par.using_vram) {
		dma_addr_t handle;
		void *base;

		/*
		 * RiscPC needs to allocate the DRAM memory
		 * for the framebuffer if we are not using
		 * VRAM.
		 */
		base = dma_alloc_writecombine(current_par.dev, size, &handle,
					      GFP_KERNEL);
		if (base == NULL) {
			printk(KERN_ERR "acornfb: unable to allocate screen "
			       "memory\n");
			return -ENOMEM;
		}

		fb_info.screen_base = base;
		fb_info.fix.smem_start = handle;
	}
#endif
	fb_info.fix.smem_len = size;
	current_par.palette_size   = VIDC_PALETTE_SIZE;

	/*
	 * Lookup the timing for this resolution.  If we can't
	 * find it, then we can't restore it if we change
	 * the resolution, so we disable this feature.
	 */
	do {
		rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb,
				 ARRAY_SIZE(modedb),
				 &acornfb_default_mode, DEFAULT_BPP);
		/*
		 * If we found an exact match, all ok.
		 */
		if (rc == 1)
			break;

		rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0,
				  &acornfb_default_mode, DEFAULT_BPP);
		/*
		 * If we found an exact match, all ok.
		 */
		if (rc == 1)
			break;

		rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb,
				 ARRAY_SIZE(modedb),
				 &acornfb_default_mode, DEFAULT_BPP);
		if (rc)
			break;

		rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0,
				  &acornfb_default_mode, DEFAULT_BPP);
	} while (0);

	/*
	 * If we didn't find an exact match, try the
	 * generic database.
	 */
	if (rc == 0) {
		printk("Acornfb: no valid mode found\n");
		return -EINVAL;
	}

	h_sync = 1953125000 / fb_info.var.pixclock;
	h_sync = h_sync * 512 / (fb_info.var.xres + fb_info.var.left_margin +
		 fb_info.var.right_margin + fb_info.var.hsync_len);
	v_sync = h_sync / (fb_info.var.yres + fb_info.var.upper_margin +
		 fb_info.var.lower_margin + fb_info.var.vsync_len);

	printk(KERN_INFO "Acornfb: %dkB %cRAM, %s, using %dx%d, "
		"%d.%03dkHz, %dHz\n",
		fb_info.fix.smem_len / 1024,
		current_par.using_vram ? 'V' : 'D',
		VIDC_NAME, fb_info.var.xres, fb_info.var.yres,
		h_sync / 1000, h_sync % 1000, v_sync);

	printk(KERN_INFO "Acornfb: Monitor: %d.%03d-%d.%03dkHz, %d-%dHz%s\n",
		fb_info.monspecs.hfmin / 1000, fb_info.monspecs.hfmin % 1000,
		fb_info.monspecs.hfmax / 1000, fb_info.monspecs.hfmax % 1000,
		fb_info.monspecs.vfmin, fb_info.monspecs.vfmax,
		fb_info.monspecs.dpms ? ", DPMS" : "");

	if (fb_set_var(&fb_info, &fb_info.var))
		printk(KERN_ERR "Acornfb: unable to set display parameters\n");

	if (register_framebuffer(&fb_info) < 0)
		return -EINVAL;
	return 0;
}

static struct platform_driver acornfb_driver = {
	.probe	= acornfb_probe,
	.driver	= {
		.name	= "acornfb",
	},
};

static int __init acornfb_init(void)
{
	return platform_driver_register(&acornfb_driver);
}

module_init(acornfb_init);

MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("VIDC 1/1a/20 framebuffer driver");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud