aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/video/pxafb.c
blob: 16e37a535d850f83e065d82b9b66069f87cdbb5d (plain) (tree)
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
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
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
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391












































                                                                             
                      
































































































































































































































































































































































































































                                                                                                                            
                                   
































































































































































































































































































































































































































































































                                                                                                          
                                                                           




























































































































































































































































































































































































































































                                                                                               
/*
 *  linux/drivers/video/pxafb.c
 *
 *  Copyright (C) 1999 Eric A. Thomas.
 *  Copyright (C) 2004 Jean-Frederic Clere.
 *  Copyright (C) 2004 Ian Campbell.
 *  Copyright (C) 2004 Jeff Lackey.
 *   Based on sa1100fb.c Copyright (C) 1999 Eric A. Thomas
 *  which in turn is
 *   Based on acornfb.c Copyright (C) Russell King.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 *
 *	        Intel PXA250/210 LCD Controller Frame Buffer Driver
 *
 * Please direct your questions and comments on this driver to the following
 * email address:
 *
 *	linux-arm-kernel@lists.arm.linux.org.uk
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/cpufreq.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>

#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/div64.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/bitfield.h>
#include <asm/arch/pxafb.h>

/*
 * Complain if VAR is out of range.
 */
#define DEBUG_VAR 1

#include "pxafb.h"

/* Bits which should not be set in machine configuration structures */
#define LCCR0_INVALID_CONFIG_MASK (LCCR0_OUM|LCCR0_BM|LCCR0_QDM|LCCR0_DIS|LCCR0_EFM|LCCR0_IUM|LCCR0_SFM|LCCR0_LDM|LCCR0_ENB)
#define LCCR3_INVALID_CONFIG_MASK (LCCR3_HSP|LCCR3_VSP|LCCR3_PCD|LCCR3_BPP)

static void (*pxafb_backlight_power)(int);
static void (*pxafb_lcd_power)(int);

static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *);
static void set_ctrlr_state(struct pxafb_info *fbi, u_int state);

#ifdef CONFIG_FB_PXA_PARAMETERS
#define PXAFB_OPTIONS_SIZE 256
static char g_options[PXAFB_OPTIONS_SIZE] __initdata = "";
#endif

static inline void pxafb_schedule_work(struct pxafb_info *fbi, u_int state)
{
	unsigned long flags;

	local_irq_save(flags);
	/*
	 * We need to handle two requests being made at the same time.
	 * There are two important cases:
	 *  1. When we are changing VT (C_REENABLE) while unblanking (C_ENABLE)
	 *     We must perform the unblanking, which will do our REENABLE for us.
	 *  2. When we are blanking, but immediately unblank before we have
	 *     blanked.  We do the "REENABLE" thing here as well, just to be sure.
	 */
	if (fbi->task_state == C_ENABLE && state == C_REENABLE)
		state = (u_int) -1;
	if (fbi->task_state == C_DISABLE && state == C_ENABLE)
		state = C_REENABLE;

	if (state != (u_int)-1) {
		fbi->task_state = state;
		schedule_work(&fbi->task);
	}
	local_irq_restore(flags);
}

static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
{
	chan &= 0xffff;
	chan >>= 16 - bf->length;
	return chan << bf->offset;
}

static int
pxafb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
		       u_int trans, struct fb_info *info)
{
	struct pxafb_info *fbi = (struct pxafb_info *)info;
	u_int val, ret = 1;

	if (regno < fbi->palette_size) {
		if (fbi->fb.var.grayscale) {
			val = ((blue >> 8) & 0x00ff);
		} else {
			val  = ((red   >>  0) & 0xf800);
			val |= ((green >>  5) & 0x07e0);
			val |= ((blue  >> 11) & 0x001f);
		}
		fbi->palette_cpu[regno] = val;
		ret = 0;
	}
	return ret;
}

static int
pxafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
		   u_int trans, struct fb_info *info)
{
	struct pxafb_info *fbi = (struct pxafb_info *)info;
	unsigned int val;
	int ret = 1;

	/*
	 * If inverse mode was selected, invert all the colours
	 * rather than the register number.  The register number
	 * is what you poke into the framebuffer to produce the
	 * colour you requested.
	 */
	if (fbi->cmap_inverse) {
		red   = 0xffff - red;
		green = 0xffff - green;
		blue  = 0xffff - blue;
	}

	/*
	 * If greyscale is true, then we convert the RGB value
	 * to greyscale no matter what visual we are using.
	 */
	if (fbi->fb.var.grayscale)
		red = green = blue = (19595 * red + 38470 * green +
					7471 * blue) >> 16;

	switch (fbi->fb.fix.visual) {
	case FB_VISUAL_TRUECOLOR:
		/*
		 * 16-bit True Colour.  We encode the RGB value
		 * according to the RGB bitfield information.
		 */
		if (regno < 16) {
			u32 *pal = fbi->fb.pseudo_palette;

			val  = chan_to_field(red, &fbi->fb.var.red);
			val |= chan_to_field(green, &fbi->fb.var.green);
			val |= chan_to_field(blue, &fbi->fb.var.blue);

			pal[regno] = val;
			ret = 0;
		}
		break;

	case FB_VISUAL_STATIC_PSEUDOCOLOR:
	case FB_VISUAL_PSEUDOCOLOR:
		ret = pxafb_setpalettereg(regno, red, green, blue, trans, info);
		break;
	}

	return ret;
}

/*
 *  pxafb_bpp_to_lccr3():
 *    Convert a bits per pixel value to the correct bit pattern for LCCR3
 */
static int pxafb_bpp_to_lccr3(struct fb_var_screeninfo *var)
{
        int ret = 0;
        switch (var->bits_per_pixel) {
        case 1:  ret = LCCR3_1BPP; break;
        case 2:  ret = LCCR3_2BPP; break;
        case 4:  ret = LCCR3_4BPP; break;
        case 8:  ret = LCCR3_8BPP; break;
        case 16: ret = LCCR3_16BPP; break;
        }
        return ret;
}

#ifdef CONFIG_CPU_FREQ
/*
 *  pxafb_display_dma_period()
 *    Calculate the minimum period (in picoseconds) between two DMA
 *    requests for the LCD controller.  If we hit this, it means we're
 *    doing nothing but LCD DMA.
 */
static unsigned int pxafb_display_dma_period(struct fb_var_screeninfo *var)
{
       /*
        * Period = pixclock * bits_per_byte * bytes_per_transfer
        *              / memory_bits_per_pixel;
        */
       return var->pixclock * 8 * 16 / var->bits_per_pixel;
}

extern unsigned int get_clk_frequency_khz(int info);
#endif

/*
 *  pxafb_check_var():
 *    Get the video params out of 'var'. If a value doesn't fit, round it up,
 *    if it's too big, return -EINVAL.
 *
 *    Round up in the following order: bits_per_pixel, xres,
 *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 *    bitfields, horizontal timing, vertical timing.
 */
static int pxafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	struct pxafb_info *fbi = (struct pxafb_info *)info;

	if (var->xres < MIN_XRES)
		var->xres = MIN_XRES;
	if (var->yres < MIN_YRES)
		var->yres = MIN_YRES;
	if (var->xres > fbi->max_xres)
		var->xres = fbi->max_xres;
	if (var->yres > fbi->max_yres)
		var->yres = fbi->max_yres;
	var->xres_virtual =
		max(var->xres_virtual, var->xres);
	var->yres_virtual =
		max(var->yres_virtual, var->yres);

        /*
	 * Setup the RGB parameters for this display.
	 *
	 * The pixel packing format is described on page 7-11 of the
	 * PXA2XX Developer's Manual.
         */
	if (var->bits_per_pixel == 16) {
		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 = var->transp.length = 0;
	} else {
		var->red.offset = var->green.offset = var->blue.offset = var->transp.offset = 0;
		var->red.length   = 8;
		var->green.length = 8;
		var->blue.length  = 8;
		var->transp.length = 0;
	}

#ifdef CONFIG_CPU_FREQ
	DPRINTK("dma period = %d ps, clock = %d kHz\n",
		pxafb_display_dma_period(var),
		get_clk_frequency_khz(0));
#endif

	return 0;
}

static inline void pxafb_set_truecolor(u_int is_true_color)
{
	DPRINTK("true_color = %d\n", is_true_color);
	// do your machine-specific setup if needed
}

/*
 * pxafb_set_par():
 *	Set the user defined part of the display for the specified console
 */
static int pxafb_set_par(struct fb_info *info)
{
	struct pxafb_info *fbi = (struct pxafb_info *)info;
	struct fb_var_screeninfo *var = &info->var;
	unsigned long palette_mem_size;

	DPRINTK("set_par\n");

	if (var->bits_per_pixel == 16)
		fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR;
	else if (!fbi->cmap_static)
		fbi->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
	else {
		/*
		 * Some people have weird ideas about wanting static
		 * pseudocolor maps.  I suspect their user space
		 * applications are broken.
		 */
		fbi->fb.fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
	}

	fbi->fb.fix.line_length = var->xres_virtual *
				  var->bits_per_pixel / 8;
	if (var->bits_per_pixel == 16)
		fbi->palette_size = 0;
	else
		fbi->palette_size = var->bits_per_pixel == 1 ? 4 : 1 << var->bits_per_pixel;

	palette_mem_size = fbi->palette_size * sizeof(u16);

	DPRINTK("palette_mem_size = 0x%08lx\n", (u_long) palette_mem_size);

	fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
	fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;

	/*
	 * Set (any) board control register to handle new color depth
	 */
	pxafb_set_truecolor(fbi->fb.fix.visual == FB_VISUAL_TRUECOLOR);

	if (fbi->fb.var.bits_per_pixel == 16)
		fb_dealloc_cmap(&fbi->fb.cmap);
	else
		fb_alloc_cmap(&fbi->fb.cmap, 1<<fbi->fb.var.bits_per_pixel, 0);

	pxafb_activate_var(var, fbi);

	return 0;
}

/*
 * Formal definition of the VESA spec:
 *  On
 *  	This refers to the state of the display when it is in full operation
 *  Stand-By
 *  	This defines an optional operating state of minimal power reduction with
 *  	the shortest recovery time
 *  Suspend
 *  	This refers to a level of power management in which substantial power
 *  	reduction is achieved by the display.  The display can have a longer
 *  	recovery time from this state than from the Stand-by state
 *  Off
 *  	This indicates that the display is consuming the lowest level of power
 *  	and is non-operational. Recovery from this state may optionally require
 *  	the user to manually power on the monitor
 *
 *  Now, the fbdev driver adds an additional state, (blank), where they
 *  turn off the video (maybe by colormap tricks), but don't mess with the
 *  video itself: think of it semantically between on and Stand-By.
 *
 *  So here's what we should do in our fbdev blank routine:
 *
 *  	VESA_NO_BLANKING (mode 0)	Video on,  front/back light on
 *  	VESA_VSYNC_SUSPEND (mode 1)  	Video on,  front/back light off
 *  	VESA_HSYNC_SUSPEND (mode 2)  	Video on,  front/back light off
 *  	VESA_POWERDOWN (mode 3)		Video off, front/back light off
 *
 *  This will match the matrox implementation.
 */

/*
 * pxafb_blank():
 *	Blank the display by setting all palette values to zero.  Note, the
 * 	16 bpp mode does not really use the palette, so this will not
 *      blank the display in all modes.
 */
static int pxafb_blank(int blank, struct fb_info *info)
{
	struct pxafb_info *fbi = (struct pxafb_info *)info;
	int i;

	DPRINTK("pxafb_blank: blank=%d\n", blank);

	switch (blank) {
	case FB_BLANK_POWERDOWN:
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
	case FB_BLANK_NORMAL:
		if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
		    fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
			for (i = 0; i < fbi->palette_size; i++)
				pxafb_setpalettereg(i, 0, 0, 0, 0, info);

		pxafb_schedule_work(fbi, C_DISABLE);
		//TODO if (pxafb_blank_helper) pxafb_blank_helper(blank);
		break;

	case FB_BLANK_UNBLANK:
		//TODO if (pxafb_blank_helper) pxafb_blank_helper(blank);
		if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
		    fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
			fb_set_cmap(&fbi->fb.cmap, info);
		pxafb_schedule_work(fbi, C_ENABLE);
	}
	return 0;
}

static int pxafb_mmap(struct fb_info *info, struct file *file,
		      struct vm_area_struct *vma)
{
	struct pxafb_info *fbi = (struct pxafb_info *)info;
	unsigned long off = vma->vm_pgoff << PAGE_SHIFT;

	if (off < info->fix.smem_len) {
		vma->vm_pgoff += 1;
		return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
					     fbi->map_dma, fbi->map_size);
	}
	return -EINVAL;
}

static struct fb_ops pxafb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= pxafb_check_var,
	.fb_set_par	= pxafb_set_par,
	.fb_setcolreg	= pxafb_setcolreg,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_blank	= pxafb_blank,
	.fb_cursor	= soft_cursor,
	.fb_mmap	= pxafb_mmap,
};

/*
 * Calculate the PCD value from the clock rate (in picoseconds).
 * We take account of the PPCR clock setting.
 * From PXA Developer's Manual:
 *
 *   PixelClock =      LCLK
 *                -------------
 *                2 ( PCD + 1 )
 *
 *   PCD =      LCLK
 *         ------------- - 1
 *         2(PixelClock)
 *
 * Where:
 *   LCLK = LCD/Memory Clock
 *   PCD = LCCR3[7:0]
 *
 * PixelClock here is in Hz while the pixclock argument given is the
 * period in picoseconds. Hence PixelClock = 1 / ( pixclock * 10^-12 )
 *
 * The function get_lclk_frequency_10khz returns LCLK in units of
 * 10khz. Calling the result of this function lclk gives us the
 * following
 *
 *    PCD = (lclk * 10^4 ) * ( pixclock * 10^-12 )
 *          -------------------------------------- - 1
 *                          2
 *
 * Factoring the 10^4 and 10^-12 out gives 10^-8 == 1 / 100000000 as used below.
 */
static inline unsigned int get_pcd(unsigned int pixclock)
{
	unsigned long long pcd;

	/* FIXME: Need to take into account Double Pixel Clock mode
         * (DPC) bit? or perhaps set it based on the various clock
         * speeds */

	pcd = (unsigned long long)get_lcdclk_frequency_10khz() * pixclock;
	do_div(pcd, 100000000 * 2);
	/* no need for this, since we should subtract 1 anyway. they cancel */
	/* pcd += 1; */ /* make up for integer math truncations */
	return (unsigned int)pcd;
}

/*
 * pxafb_activate_var():
 *	Configures LCD Controller based on entries in var parameter.  Settings are
 *	only written to the controller if changes were made.
 */
static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *fbi)
{
	struct pxafb_lcd_reg new_regs;
	u_long flags;
	u_int lines_per_panel, pcd = get_pcd(var->pixclock);

	DPRINTK("Configuring PXA LCD\n");

	DPRINTK("var: xres=%d hslen=%d lm=%d rm=%d\n",
		var->xres, var->hsync_len,
		var->left_margin, var->right_margin);
	DPRINTK("var: yres=%d vslen=%d um=%d bm=%d\n",
		var->yres, var->vsync_len,
		var->upper_margin, var->lower_margin);
	DPRINTK("var: pixclock=%d pcd=%d\n", var->pixclock, pcd);

#if DEBUG_VAR
	if (var->xres < 16        || var->xres > 1024)
		printk(KERN_ERR "%s: invalid xres %d\n",
			fbi->fb.fix.id, var->xres);
	switch(var->bits_per_pixel) {
	case 1:
	case 2:
	case 4:
	case 8:
	case 16:
		break;
	default:
		printk(KERN_ERR "%s: invalid bit depth %d\n",
		       fbi->fb.fix.id, var->bits_per_pixel);
		break;
	}
	if (var->hsync_len < 1    || var->hsync_len > 64)
		printk(KERN_ERR "%s: invalid hsync_len %d\n",
			fbi->fb.fix.id, var->hsync_len);
	if (var->left_margin < 1  || var->left_margin > 255)
		printk(KERN_ERR "%s: invalid left_margin %d\n",
			fbi->fb.fix.id, var->left_margin);
	if (var->right_margin < 1 || var->right_margin > 255)
		printk(KERN_ERR "%s: invalid right_margin %d\n",
			fbi->fb.fix.id, var->right_margin);
	if (var->yres < 1         || var->yres > 1024)
		printk(KERN_ERR "%s: invalid yres %d\n",
			fbi->fb.fix.id, var->yres);
	if (var->vsync_len < 1    || var->vsync_len > 64)
		printk(KERN_ERR "%s: invalid vsync_len %d\n",
			fbi->fb.fix.id, var->vsync_len);
	if (var->upper_margin < 0 || var->upper_margin > 255)
		printk(KERN_ERR "%s: invalid upper_margin %d\n",
			fbi->fb.fix.id, var->upper_margin);
	if (var->lower_margin < 0 || var->lower_margin > 255)
		printk(KERN_ERR "%s: invalid lower_margin %d\n",
			fbi->fb.fix.id, var->lower_margin);
#endif

	new_regs.lccr0 = fbi->lccr0 |
		(LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM |
                 LCCR0_QDM | LCCR0_BM  | LCCR0_OUM);

	new_regs.lccr1 =
		LCCR1_DisWdth(var->xres) +
		LCCR1_HorSnchWdth(var->hsync_len) +
		LCCR1_BegLnDel(var->left_margin) +
		LCCR1_EndLnDel(var->right_margin);

	/*
	 * If we have a dual scan LCD, we need to halve
	 * the YRES parameter.
	 */
	lines_per_panel = var->yres;
	if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual)
		lines_per_panel /= 2;

	new_regs.lccr2 =
		LCCR2_DisHght(lines_per_panel) +
		LCCR2_VrtSnchWdth(var->vsync_len) +
		LCCR2_BegFrmDel(var->upper_margin) +
		LCCR2_EndFrmDel(var->lower_margin);

	new_regs.lccr3 = fbi->lccr3 |
		pxafb_bpp_to_lccr3(var) |
		(var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) |
		(var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL);

	if (pcd)
		new_regs.lccr3 |= LCCR3_PixClkDiv(pcd);

	DPRINTK("nlccr0 = 0x%08x\n", new_regs.lccr0);
	DPRINTK("nlccr1 = 0x%08x\n", new_regs.lccr1);
	DPRINTK("nlccr2 = 0x%08x\n", new_regs.lccr2);
	DPRINTK("nlccr3 = 0x%08x\n", new_regs.lccr3);

	/* Update shadow copy atomically */
	local_irq_save(flags);

	/* setup dma descriptors */
	fbi->dmadesc_fblow_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 3*16);
	fbi->dmadesc_fbhigh_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 2*16);
	fbi->dmadesc_palette_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 1*16);

	fbi->dmadesc_fblow_dma = fbi->palette_dma - 3*16;
	fbi->dmadesc_fbhigh_dma = fbi->palette_dma - 2*16;
	fbi->dmadesc_palette_dma = fbi->palette_dma - 1*16;

#define BYTES_PER_PANEL (lines_per_panel * fbi->fb.fix.line_length)

	/* populate descriptors */
	fbi->dmadesc_fblow_cpu->fdadr = fbi->dmadesc_fblow_dma;
	fbi->dmadesc_fblow_cpu->fsadr = fbi->screen_dma + BYTES_PER_PANEL;
	fbi->dmadesc_fblow_cpu->fidr  = 0;
	fbi->dmadesc_fblow_cpu->ldcmd = BYTES_PER_PANEL;

	fbi->fdadr1 = fbi->dmadesc_fblow_dma; /* only used in dual-panel mode */

	fbi->dmadesc_fbhigh_cpu->fsadr = fbi->screen_dma;
	fbi->dmadesc_fbhigh_cpu->fidr = 0;
	fbi->dmadesc_fbhigh_cpu->ldcmd = BYTES_PER_PANEL;

	fbi->dmadesc_palette_cpu->fsadr = fbi->palette_dma;
	fbi->dmadesc_palette_cpu->fidr  = 0;
	fbi->dmadesc_palette_cpu->ldcmd = (fbi->palette_size * 2) | LDCMD_PAL;

	if (var->bits_per_pixel == 16) {
		/* palette shouldn't be loaded in true-color mode */
		fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
		fbi->fdadr0 = fbi->dmadesc_fbhigh_dma; /* no pal just fbhigh */
		/* init it to something, even though we won't be using it */
		fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_palette_dma;
	} else {
		fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
		fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_palette_dma;
		fbi->fdadr0 = fbi->dmadesc_palette_dma; /* flips back and forth between pal and fbhigh */
	}

#if 0
	DPRINTK("fbi->dmadesc_fblow_cpu = 0x%p\n", fbi->dmadesc_fblow_cpu);
	DPRINTK("fbi->dmadesc_fbhigh_cpu = 0x%p\n", fbi->dmadesc_fbhigh_cpu);
	DPRINTK("fbi->dmadesc_palette_cpu = 0x%p\n", fbi->dmadesc_palette_cpu);
	DPRINTK("fbi->dmadesc_fblow_dma = 0x%x\n", fbi->dmadesc_fblow_dma);
	DPRINTK("fbi->dmadesc_fbhigh_dma = 0x%x\n", fbi->dmadesc_fbhigh_dma);
	DPRINTK("fbi->dmadesc_palette_dma = 0x%x\n", fbi->dmadesc_palette_dma);

	DPRINTK("fbi->dmadesc_fblow_cpu->fdadr = 0x%x\n", fbi->dmadesc_fblow_cpu->fdadr);
	DPRINTK("fbi->dmadesc_fbhigh_cpu->fdadr = 0x%x\n", fbi->dmadesc_fbhigh_cpu->fdadr);
	DPRINTK("fbi->dmadesc_palette_cpu->fdadr = 0x%x\n", fbi->dmadesc_palette_cpu->fdadr);

	DPRINTK("fbi->dmadesc_fblow_cpu->fsadr = 0x%x\n", fbi->dmadesc_fblow_cpu->fsadr);
	DPRINTK("fbi->dmadesc_fbhigh_cpu->fsadr = 0x%x\n", fbi->dmadesc_fbhigh_cpu->fsadr);
	DPRINTK("fbi->dmadesc_palette_cpu->fsadr = 0x%x\n", fbi->dmadesc_palette_cpu->fsadr);

	DPRINTK("fbi->dmadesc_fblow_cpu->ldcmd = 0x%x\n", fbi->dmadesc_fblow_cpu->ldcmd);
	DPRINTK("fbi->dmadesc_fbhigh_cpu->ldcmd = 0x%x\n", fbi->dmadesc_fbhigh_cpu->ldcmd);
	DPRINTK("fbi->dmadesc_palette_cpu->ldcmd = 0x%x\n", fbi->dmadesc_palette_cpu->ldcmd);
#endif

	fbi->reg_lccr0 = new_regs.lccr0;
	fbi->reg_lccr1 = new_regs.lccr1;
	fbi->reg_lccr2 = new_regs.lccr2;
	fbi->reg_lccr3 = new_regs.lccr3;
	local_irq_restore(flags);

	/*
	 * Only update the registers if the controller is enabled
	 * and something has changed.
	 */
	if ((LCCR0  != fbi->reg_lccr0) || (LCCR1  != fbi->reg_lccr1) ||
	    (LCCR2  != fbi->reg_lccr2) || (LCCR3  != fbi->reg_lccr3) ||
	    (FDADR0 != fbi->fdadr0)    || (FDADR1 != fbi->fdadr1))
		pxafb_schedule_work(fbi, C_REENABLE);

	return 0;
}

/*
 * NOTE!  The following functions are purely helpers for set_ctrlr_state.
 * Do not call them directly; set_ctrlr_state does the correct serialisation
 * to ensure that things happen in the right way 100% of time time.
 *	-- rmk
 */
static inline void __pxafb_backlight_power(struct pxafb_info *fbi, int on)
{
	DPRINTK("backlight o%s\n", on ? "n" : "ff");

 	if (pxafb_backlight_power)
 		pxafb_backlight_power(on);
}

static inline void __pxafb_lcd_power(struct pxafb_info *fbi, int on)
{
	DPRINTK("LCD power o%s\n", on ? "n" : "ff");

	if (pxafb_lcd_power)
		pxafb_lcd_power(on);
}

static void pxafb_setup_gpio(struct pxafb_info *fbi)
{
	int gpio, ldd_bits;
        unsigned int lccr0 = fbi->lccr0;

	/*
	 * setup is based on type of panel supported
        */

	/* 4 bit interface */
	if ((lccr0 & LCCR0_CMS) == LCCR0_Mono &&
	    (lccr0 & LCCR0_SDS) == LCCR0_Sngl &&
	    (lccr0 & LCCR0_DPD) == LCCR0_4PixMono)
		ldd_bits = 4;

	/* 8 bit interface */
        else if (((lccr0 & LCCR0_CMS) == LCCR0_Mono &&
		  ((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_DPD) == LCCR0_8PixMono)) ||
                 ((lccr0 & LCCR0_CMS) == LCCR0_Color &&
		  (lccr0 & LCCR0_PAS) == LCCR0_Pas && (lccr0 & LCCR0_SDS) == LCCR0_Sngl))
		ldd_bits = 8;

	/* 16 bit interface */
	else if ((lccr0 & LCCR0_CMS) == LCCR0_Color &&
		 ((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_PAS) == LCCR0_Act))
		ldd_bits = 16;

	else {
	        printk(KERN_ERR "pxafb_setup_gpio: unable to determine bits per pixel\n");
		return;
        }

	for (gpio = 58; ldd_bits; gpio++, ldd_bits--)
		pxa_gpio_mode(gpio | GPIO_ALT_FN_2_OUT);
	pxa_gpio_mode(GPIO74_LCD_FCLK_MD);
	pxa_gpio_mode(GPIO75_LCD_LCLK_MD);
	pxa_gpio_mode(GPIO76_LCD_PCLK_MD);
	pxa_gpio_mode(GPIO77_LCD_ACBIAS_MD);
}

static void pxafb_enable_controller(struct pxafb_info *fbi)
{
	DPRINTK("Enabling LCD controller\n");
	DPRINTK("fdadr0 0x%08x\n", (unsigned int) fbi->fdadr0);
	DPRINTK("fdadr1 0x%08x\n", (unsigned int) fbi->fdadr1);
	DPRINTK("reg_lccr0 0x%08x\n", (unsigned int) fbi->reg_lccr0);
	DPRINTK("reg_lccr1 0x%08x\n", (unsigned int) fbi->reg_lccr1);
	DPRINTK("reg_lccr2 0x%08x\n", (unsigned int) fbi->reg_lccr2);
	DPRINTK("reg_lccr3 0x%08x\n", (unsigned int) fbi->reg_lccr3);

	/* Sequence from 11.7.10 */
	LCCR3 = fbi->reg_lccr3;
	LCCR2 = fbi->reg_lccr2;
	LCCR1 = fbi->reg_lccr1;
	LCCR0 = fbi->reg_lccr0 & ~LCCR0_ENB;

	FDADR0 = fbi->fdadr0;
	FDADR1 = fbi->fdadr1;
	LCCR0 |= LCCR0_ENB;

	DPRINTK("FDADR0 0x%08x\n", (unsigned int) FDADR0);
	DPRINTK("FDADR1 0x%08x\n", (unsigned int) FDADR1);
	DPRINTK("LCCR0 0x%08x\n", (unsigned int) LCCR0);
	DPRINTK("LCCR1 0x%08x\n", (unsigned int) LCCR1);
	DPRINTK("LCCR2 0x%08x\n", (unsigned int) LCCR2);
	DPRINTK("LCCR3 0x%08x\n", (unsigned int) LCCR3);
}

static void pxafb_disable_controller(struct pxafb_info *fbi)
{
	DECLARE_WAITQUEUE(wait, current);

	DPRINTK("Disabling LCD controller\n");

	set_current_state(TASK_UNINTERRUPTIBLE);
	add_wait_queue(&fbi->ctrlr_wait, &wait);

	LCSR = 0xffffffff;	/* Clear LCD Status Register */
	LCCR0 &= ~LCCR0_LDM;	/* Enable LCD Disable Done Interrupt */
	LCCR0 |= LCCR0_DIS;	/* Disable LCD Controller */

	schedule_timeout(20 * HZ / 1000);
	remove_wait_queue(&fbi->ctrlr_wait, &wait);
}

/*
 *  pxafb_handle_irq: Handle 'LCD DONE' interrupts.
 */
static irqreturn_t pxafb_handle_irq(int irq, void *dev_id, struct pt_regs *regs)
{
	struct pxafb_info *fbi = dev_id;
	unsigned int lcsr = LCSR;

	if (lcsr & LCSR_LDD) {
		LCCR0 |= LCCR0_LDM;
		wake_up(&fbi->ctrlr_wait);
	}

	LCSR = lcsr;
	return IRQ_HANDLED;
}

/*
 * This function must be called from task context only, since it will
 * sleep when disabling the LCD controller, or if we get two contending
 * processes trying to alter state.
 */
static void set_ctrlr_state(struct pxafb_info *fbi, u_int state)
{
	u_int old_state;

	down(&fbi->ctrlr_sem);

	old_state = fbi->state;

	/*
	 * Hack around fbcon initialisation.
	 */
	if (old_state == C_STARTUP && state == C_REENABLE)
		state = C_ENABLE;

	switch (state) {
	case C_DISABLE_CLKCHANGE:
		/*
		 * Disable controller for clock change.  If the
		 * controller is already disabled, then do nothing.
		 */
		if (old_state != C_DISABLE && old_state != C_DISABLE_PM) {
			fbi->state = state;
			//TODO __pxafb_lcd_power(fbi, 0);
			pxafb_disable_controller(fbi);
		}
		break;

	case C_DISABLE_PM:
	case C_DISABLE:
		/*
		 * Disable controller
		 */
		if (old_state != C_DISABLE) {
			fbi->state = state;
			__pxafb_backlight_power(fbi, 0);
			__pxafb_lcd_power(fbi, 0);
			if (old_state != C_DISABLE_CLKCHANGE)
				pxafb_disable_controller(fbi);
		}
		break;

	case C_ENABLE_CLKCHANGE:
		/*
		 * Enable the controller after clock change.  Only
		 * do this if we were disabled for the clock change.
		 */
		if (old_state == C_DISABLE_CLKCHANGE) {
			fbi->state = C_ENABLE;
			pxafb_enable_controller(fbi);
			//TODO __pxafb_lcd_power(fbi, 1);
		}
		break;

	case C_REENABLE:
		/*
		 * Re-enable the controller only if it was already
		 * enabled.  This is so we reprogram the control
		 * registers.
		 */
		if (old_state == C_ENABLE) {
			pxafb_disable_controller(fbi);
			pxafb_setup_gpio(fbi);
			pxafb_enable_controller(fbi);
		}
		break;

	case C_ENABLE_PM:
		/*
		 * Re-enable the controller after PM.  This is not
		 * perfect - think about the case where we were doing
		 * a clock change, and we suspended half-way through.
		 */
		if (old_state != C_DISABLE_PM)
			break;
		/* fall through */

	case C_ENABLE:
		/*
		 * Power up the LCD screen, enable controller, and
		 * turn on the backlight.
		 */
		if (old_state != C_ENABLE) {
			fbi->state = C_ENABLE;
			pxafb_setup_gpio(fbi);
			pxafb_enable_controller(fbi);
			__pxafb_lcd_power(fbi, 1);
			__pxafb_backlight_power(fbi, 1);
		}
		break;
	}
	up(&fbi->ctrlr_sem);
}

/*
 * Our LCD controller task (which is called when we blank or unblank)
 * via keventd.
 */
static void pxafb_task(void *dummy)
{
	struct pxafb_info *fbi = dummy;
	u_int state = xchg(&fbi->task_state, -1);

	set_ctrlr_state(fbi, state);
}

#ifdef CONFIG_CPU_FREQ
/*
 * CPU clock speed change handler.  We need to adjust the LCD timing
 * parameters when the CPU clock is adjusted by the power management
 * subsystem.
 *
 * TODO: Determine why f->new != 10*get_lclk_frequency_10khz()
 */
static int
pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data)
{
	struct pxafb_info *fbi = TO_INF(nb, freq_transition);
	//TODO struct cpufreq_freqs *f = data;
	u_int pcd;

	switch (val) {
	case CPUFREQ_PRECHANGE:
		set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
		break;

	case CPUFREQ_POSTCHANGE:
		pcd = get_pcd(fbi->fb.var.pixclock);
		fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
		set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
		break;
	}
	return 0;
}

static int
pxafb_freq_policy(struct notifier_block *nb, unsigned long val, void *data)
{
	struct pxafb_info *fbi = TO_INF(nb, freq_policy);
	struct fb_var_screeninfo *var = &fbi->fb.var;
	struct cpufreq_policy *policy = data;

	switch (val) {
	case CPUFREQ_ADJUST:
	case CPUFREQ_INCOMPATIBLE:
		printk(KERN_DEBUG "min dma period: %d ps, "
			"new clock %d kHz\n", pxafb_display_dma_period(var),
			policy->max);
		// TODO: fill in min/max values
		break;
#if 0
	case CPUFREQ_NOTIFY:
		printk(KERN_ERR "%s: got CPUFREQ_NOTIFY\n", __FUNCTION__);
		do {} while(0);
		/* todo: panic if min/max values aren't fulfilled
		 * [can't really happen unless there's a bug in the
		 * CPU policy verification process *
		 */
		break;
#endif
	}
	return 0;
}
#endif

#ifdef CONFIG_PM
/*
 * Power management hooks.  Note that we won't be called from IRQ context,
 * unlike the blank functions above, so we may sleep.
 */
static int pxafb_suspend(struct device *dev, pm_message_t state, u32 level)
{
	struct pxafb_info *fbi = dev_get_drvdata(dev);

	if (level == SUSPEND_DISABLE || level == SUSPEND_POWER_DOWN)
		set_ctrlr_state(fbi, C_DISABLE_PM);
	return 0;
}

static int pxafb_resume(struct device *dev, u32 level)
{
	struct pxafb_info *fbi = dev_get_drvdata(dev);

	if (level == RESUME_ENABLE)
		set_ctrlr_state(fbi, C_ENABLE_PM);
	return 0;
}
#else
#define pxafb_suspend	NULL
#define pxafb_resume	NULL
#endif

/*
 * pxafb_map_video_memory():
 *      Allocates the DRAM memory for the frame buffer.  This buffer is
 *	remapped into a non-cached, non-buffered, memory region to
 *      allow palette and pixel writes to occur without flushing the
 *      cache.  Once this area is remapped, all virtual memory
 *      access to the video memory should occur at the new region.
 */
static int __init pxafb_map_video_memory(struct pxafb_info *fbi)
{
	u_long palette_mem_size;

	/*
	 * We reserve one page for the palette, plus the size
	 * of the framebuffer.
	 */
	fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE);
	fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
					      &fbi->map_dma, GFP_KERNEL);

	if (fbi->map_cpu) {
		/* prevent initial garbage on screen */
		memset(fbi->map_cpu, 0, fbi->map_size);
		fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE;
		fbi->screen_dma = fbi->map_dma + PAGE_SIZE;
		/*
		 * FIXME: this is actually the wrong thing to place in
		 * smem_start.  But fbdev suffers from the problem that
		 * it needs an API which doesn't exist (in this case,
		 * dma_writecombine_mmap)
		 */
		fbi->fb.fix.smem_start = fbi->screen_dma;

		fbi->palette_size = fbi->fb.var.bits_per_pixel == 8 ? 256 : 16;

		palette_mem_size = fbi->palette_size * sizeof(u16);
		DPRINTK("palette_mem_size = 0x%08lx\n", (u_long) palette_mem_size);

		fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
		fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
	}

	return fbi->map_cpu ? 0 : -ENOMEM;
}

static struct pxafb_info * __init pxafb_init_fbinfo(struct device *dev)
{
	struct pxafb_info *fbi;
	void *addr;
	struct pxafb_mach_info *inf = dev->platform_data;

	/* Alloc the pxafb_info and pseudo_palette in one step */
	fbi = kmalloc(sizeof(struct pxafb_info) + sizeof(u32) * 16, GFP_KERNEL);
	if (!fbi)
		return NULL;

	memset(fbi, 0, sizeof(struct pxafb_info));
	fbi->dev = dev;

	strcpy(fbi->fb.fix.id, PXA_NAME);

	fbi->fb.fix.type	= FB_TYPE_PACKED_PIXELS;
	fbi->fb.fix.type_aux	= 0;
	fbi->fb.fix.xpanstep	= 0;
	fbi->fb.fix.ypanstep	= 0;
	fbi->fb.fix.ywrapstep	= 0;
	fbi->fb.fix.accel	= FB_ACCEL_NONE;

	fbi->fb.var.nonstd	= 0;
	fbi->fb.var.activate	= FB_ACTIVATE_NOW;
	fbi->fb.var.height	= -1;
	fbi->fb.var.width	= -1;
	fbi->fb.var.accel_flags	= 0;
	fbi->fb.var.vmode	= FB_VMODE_NONINTERLACED;

	fbi->fb.fbops		= &pxafb_ops;
	fbi->fb.flags		= FBINFO_DEFAULT;
	fbi->fb.node		= -1;

	addr = fbi;
	addr = addr + sizeof(struct pxafb_info);
	fbi->fb.pseudo_palette	= addr;

	fbi->max_xres			= inf->xres;
	fbi->fb.var.xres		= inf->xres;
	fbi->fb.var.xres_virtual	= inf->xres;
	fbi->max_yres			= inf->yres;
	fbi->fb.var.yres		= inf->yres;
	fbi->fb.var.yres_virtual	= inf->yres;
	fbi->max_bpp			= inf->bpp;
	fbi->fb.var.bits_per_pixel	= inf->bpp;
	fbi->fb.var.pixclock		= inf->pixclock;
	fbi->fb.var.hsync_len		= inf->hsync_len;
	fbi->fb.var.left_margin		= inf->left_margin;
	fbi->fb.var.right_margin	= inf->right_margin;
	fbi->fb.var.vsync_len		= inf->vsync_len;
	fbi->fb.var.upper_margin	= inf->upper_margin;
	fbi->fb.var.lower_margin	= inf->lower_margin;
	fbi->fb.var.sync		= inf->sync;
	fbi->fb.var.grayscale		= inf->cmap_greyscale;
	fbi->cmap_inverse		= inf->cmap_inverse;
	fbi->cmap_static		= inf->cmap_static;
	fbi->lccr0			= inf->lccr0;
	fbi->lccr3			= inf->lccr3;
	fbi->state			= C_STARTUP;
	fbi->task_state			= (u_char)-1;
	fbi->fb.fix.smem_len		= fbi->max_xres * fbi->max_yres *
					  fbi->max_bpp / 8;

	init_waitqueue_head(&fbi->ctrlr_wait);
	INIT_WORK(&fbi->task, pxafb_task, fbi);
	init_MUTEX(&fbi->ctrlr_sem);

	return fbi;
}

#ifdef CONFIG_FB_PXA_PARAMETERS
static int __init pxafb_parse_options(struct device *dev, char *options)
{
	struct pxafb_mach_info *inf = dev->platform_data;
	char *this_opt;

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

	dev_dbg(dev, "options are \"%s\"\n", options ? options : "null");

	/* could be made table driven or similar?... */
        while ((this_opt = strsep(&options, ",")) != NULL) {
                if (!strncmp(this_opt, "mode:", 5)) {
			const char *name = this_opt+5;
			unsigned int namelen = strlen(name);
			int res_specified = 0, bpp_specified = 0;
			unsigned int xres = 0, yres = 0, bpp = 0;
			int yres_specified = 0;
			int i;
			for (i = namelen-1; i >= 0; i--) {
				switch (name[i]) {
				case '-':
					namelen = i;
					if (!bpp_specified && !yres_specified) {
						bpp = simple_strtoul(&name[i+1], NULL, 0);
						bpp_specified = 1;
					} else
						goto done;
					break;
				case 'x':
					if (!yres_specified) {
						yres = simple_strtoul(&name[i+1], NULL, 0);
						yres_specified = 1;
					} else
						goto done;
					break;
				case '0'...'9':
					break;
				default:
					goto done;
				}
			}
			if (i < 0 && yres_specified) {
				xres = simple_strtoul(name, NULL, 0);
				res_specified = 1;
			}
		done:
			if (res_specified) {
				dev_info(dev, "overriding resolution: %dx%d\n", xres, yres);
				inf->xres = xres; inf->yres = yres;
			}
			if (bpp_specified)
				switch (bpp) {
				case 1:
				case 2:
				case 4:
				case 8:
				case 16:
					inf->bpp = bpp;
					dev_info(dev, "overriding bit depth: %d\n", bpp);
					break;
				default:
					dev_err(dev, "Depth %d is not valid\n", bpp);
				}
                } else if (!strncmp(this_opt, "pixclock:", 9)) {
                        inf->pixclock = simple_strtoul(this_opt+9, NULL, 0);
			dev_info(dev, "override pixclock: %ld\n", inf->pixclock);
                } else if (!strncmp(this_opt, "left:", 5)) {
                        inf->left_margin = simple_strtoul(this_opt+5, NULL, 0);
			dev_info(dev, "override left: %u\n", inf->left_margin);
                } else if (!strncmp(this_opt, "right:", 6)) {
                        inf->right_margin = simple_strtoul(this_opt+6, NULL, 0);
			dev_info(dev, "override right: %u\n", inf->right_margin);
                } else if (!strncmp(this_opt, "upper:", 6)) {
                        inf->upper_margin = simple_strtoul(this_opt+6, NULL, 0);
			dev_info(dev, "override upper: %u\n", inf->upper_margin);
                } else if (!strncmp(this_opt, "lower:", 6)) {
                        inf->lower_margin = simple_strtoul(this_opt+6, NULL, 0);
			dev_info(dev, "override lower: %u\n", inf->lower_margin);
                } else if (!strncmp(this_opt, "hsynclen:", 9)) {
                        inf->hsync_len = simple_strtoul(this_opt+9, NULL, 0);
			dev_info(dev, "override hsynclen: %u\n", inf->hsync_len);
                } else if (!strncmp(this_opt, "vsynclen:", 9)) {
                        inf->vsync_len = simple_strtoul(this_opt+9, NULL, 0);
			dev_info(dev, "override vsynclen: %u\n", inf->vsync_len);
                } else if (!strncmp(this_opt, "hsync:", 6)) {
                        if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
				dev_info(dev, "override hsync: Active Low\n");
				inf->sync &= ~FB_SYNC_HOR_HIGH_ACT;
			} else {
				dev_info(dev, "override hsync: Active High\n");
				inf->sync |= FB_SYNC_HOR_HIGH_ACT;
			}
                } else if (!strncmp(this_opt, "vsync:", 6)) {
                        if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
				dev_info(dev, "override vsync: Active Low\n");
				inf->sync &= ~FB_SYNC_VERT_HIGH_ACT;
			} else {
				dev_info(dev, "override vsync: Active High\n");
				inf->sync |= FB_SYNC_VERT_HIGH_ACT;
			}
                } else if (!strncmp(this_opt, "dpc:", 4)) {
                        if (simple_strtoul(this_opt+4, NULL, 0) == 0) {
				dev_info(dev, "override double pixel clock: false\n");
				inf->lccr3 &= ~LCCR3_DPC;
			} else {
				dev_info(dev, "override double pixel clock: true\n");
				inf->lccr3 |= LCCR3_DPC;
			}
                } else if (!strncmp(this_opt, "outputen:", 9)) {
                        if (simple_strtoul(this_opt+9, NULL, 0) == 0) {
				dev_info(dev, "override output enable: active low\n");
				inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnL;
			} else {
				dev_info(dev, "override output enable: active high\n");
				inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnH;
			}
                } else if (!strncmp(this_opt, "pixclockpol:", 12)) {
                        if (simple_strtoul(this_opt+12, NULL, 0) == 0) {
				dev_info(dev, "override pixel clock polarity: falling edge\n");
				inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixFlEdg;
			} else {
				dev_info(dev, "override pixel clock polarity: rising edge\n");
				inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixRsEdg;
			}
                } else if (!strncmp(this_opt, "color", 5)) {
			inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Color;
                } else if (!strncmp(this_opt, "mono", 4)) {
			inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Mono;
                } else if (!strncmp(this_opt, "active", 6)) {
			inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Act;
                } else if (!strncmp(this_opt, "passive", 7)) {
			inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Pas;
                } else if (!strncmp(this_opt, "single", 6)) {
			inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Sngl;
                } else if (!strncmp(this_opt, "dual", 4)) {
			inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Dual;
                } else if (!strncmp(this_opt, "4pix", 4)) {
			inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_4PixMono;
                } else if (!strncmp(this_opt, "8pix", 4)) {
			inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_8PixMono;
		} else {
			dev_err(dev, "unknown option: %s\n", this_opt);
			return -EINVAL;
		}
        }
        return 0;

}
#endif

int __init pxafb_probe(struct device *dev)
{
	struct pxafb_info *fbi;
	struct pxafb_mach_info *inf;
	int ret;

	dev_dbg(dev, "pxafb_probe\n");

	inf = dev->platform_data;
	ret = -ENOMEM;
	fbi = NULL;
	if (!inf)
		goto failed;

#ifdef CONFIG_FB_PXA_PARAMETERS
	ret = pxafb_parse_options(dev, g_options);
	if (ret < 0)
		goto failed;
#endif

#ifdef DEBUG_VAR
        /* Check for various illegal bit-combinations. Currently only
	 * a warning is given. */

        if (inf->lccr0 & LCCR0_INVALID_CONFIG_MASK)
                dev_warn(dev, "machine LCCR0 setting contains illegal bits: %08x\n",
                        inf->lccr0 & LCCR0_INVALID_CONFIG_MASK);
        if (inf->lccr3 & LCCR3_INVALID_CONFIG_MASK)
                dev_warn(dev, "machine LCCR3 setting contains illegal bits: %08x\n",
                        inf->lccr3 & LCCR3_INVALID_CONFIG_MASK);
        if (inf->lccr0 & LCCR0_DPD &&
	    ((inf->lccr0 & LCCR0_PAS) != LCCR0_Pas ||
	     (inf->lccr0 & LCCR0_SDS) != LCCR0_Sngl ||
	     (inf->lccr0 & LCCR0_CMS) != LCCR0_Mono))
                dev_warn(dev, "Double Pixel Data (DPD) mode is only valid in passive mono"
			 " single panel mode\n");
        if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Act &&
	    (inf->lccr0 & LCCR0_SDS) == LCCR0_Dual)
                dev_warn(dev, "Dual panel only valid in passive mode\n");
        if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Pas &&
             (inf->upper_margin || inf->lower_margin))
                dev_warn(dev, "Upper and lower margins must be 0 in passive mode\n");
#endif

	dev_dbg(dev, "got a %dx%dx%d LCD\n",inf->xres, inf->yres, inf->bpp);
	if (inf->xres == 0 || inf->yres == 0 || inf->bpp == 0) {
		dev_err(dev, "Invalid resolution or bit depth\n");
		ret = -EINVAL;
		goto failed;
	}
	pxafb_backlight_power = inf->pxafb_backlight_power;
	pxafb_lcd_power = inf->pxafb_lcd_power;
	fbi = pxafb_init_fbinfo(dev);
	if (!fbi) {
		dev_err(dev, "Failed to initialize framebuffer device\n");
		ret = -ENOMEM; // only reason for pxafb_init_fbinfo to fail is kmalloc
		goto failed;
	}

	/* Initialize video memory */
	ret = pxafb_map_video_memory(fbi);
	if (ret) {
		dev_err(dev, "Failed to allocate video RAM: %d\n", ret);
		ret = -ENOMEM;
		goto failed;
	}
	/* enable LCD controller clock */
	pxa_set_cken(CKEN16_LCD, 1);

	ret = request_irq(IRQ_LCD, pxafb_handle_irq, SA_INTERRUPT, "LCD", fbi);
	if (ret) {
		dev_err(dev, "request_irq failed: %d\n", ret);
		ret = -EBUSY;
		goto failed;
	}

	/*
	 * This makes sure that our colour bitfield
	 * descriptors are correctly initialised.
	 */
	pxafb_check_var(&fbi->fb.var, &fbi->fb);
	pxafb_set_par(&fbi->fb);

	dev_set_drvdata(dev, fbi);

	ret = register_framebuffer(&fbi->fb);
	if (ret < 0) {
		dev_err(dev, "Failed to register framebuffer device: %d\n", ret);
		goto failed;
	}

#ifdef CONFIG_PM
	// TODO
#endif

#ifdef CONFIG_CPU_FREQ
	fbi->freq_transition.notifier_call = pxafb_freq_transition;
	fbi->freq_policy.notifier_call = pxafb_freq_policy;
	cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
	cpufreq_register_notifier(&fbi->freq_policy, CPUFREQ_POLICY_NOTIFIER);
#endif

	/*
	 * Ok, now enable the LCD controller
	 */
	set_ctrlr_state(fbi, C_ENABLE);

	return 0;

failed:
	dev_set_drvdata(dev, NULL);
	kfree(fbi);
	return ret;
}

static struct device_driver pxafb_driver = {
	.name		= "pxa2xx-fb",
	.bus		= &platform_bus_type,
	.probe		= pxafb_probe,
#ifdef CONFIG_PM
	.suspend	= pxafb_suspend,
	.resume		= pxafb_resume,
#endif
};

#ifndef MODULE
int __devinit pxafb_setup(char *options)
{
# ifdef CONFIG_FB_PXA_PARAMETERS
	strlcpy(g_options, options, sizeof(g_options));
# endif
	return 0;
}
#else
# ifdef CONFIG_FB_PXA_PARAMETERS
module_param_string(options, g_options, sizeof(g_options), 0);
MODULE_PARM_DESC(options, "LCD parameters (see Documentation/fb/pxafb.txt)");
# endif
#endif

int __devinit pxafb_init(void)
{
#ifndef MODULE
	char *option = NULL;

	if (fb_get_options("pxafb", &option))
		return -ENODEV;
	pxafb_setup(option);
#endif
	return driver_register(&pxafb_driver);
}

module_init(pxafb_init);

MODULE_DESCRIPTION("loadable framebuffer driver for PXA");
MODULE_LICENSE("GPL");