aboutsummaryrefslogtreecommitdiff
path: root/drivers/video/mxc/mxcfb.c
blob: 52694e49e69d59e2fb9807b1e0d9fdb71e0a4fa5 (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
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
/*
 * Copyright 2004-2011 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

/*!
 * @defgroup Framebuffer Framebuffer Driver for SDC and ADC.
 */

/*!
 * @file mxcfb.c
 *
 * @brief MXC Frame buffer driver for SDC
 *
 * @ingroup Framebuffer
 */

/*!
 * Include files
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.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/dma-mapping.h>
#include <linux/clk.h>
#include <linux/console.h>
#include <linux/io.h>
#include <linux/ipu.h>
#include <linux/mxcfb.h>
#include <linux/uaccess.h>
#include <asm/mach-types.h>

/*
 * Driver name
 */
#define MXCFB_NAME      "mxc_sdc_fb"
/*!
 * Structure containing the MXC specific framebuffer information.
 */
struct mxcfb_info {
	int blank;
	ipu_channel_t ipu_ch;
	uint32_t ipu_ch_irq;
	uint32_t cur_ipu_buf;

	u32 pseudo_palette[16];

	struct semaphore flip_sem;
	spinlock_t fb_lock;
};

struct mxcfb_data {
	struct fb_info *fbi;
	struct fb_info *fbi_ovl;
	volatile int32_t vsync_flag;
	wait_queue_head_t vsync_wq;
	wait_queue_head_t suspend_wq;
	bool suspended;
	int backlight_level;
};

struct mxcfb_alloc_list {
	struct list_head list;
	dma_addr_t phy_addr;
	void *cpu_addr;
	u32 size;
};

static struct mxcfb_data mxcfb_drv_data;

static char *fb_mode;
static unsigned long default_bpp = 16;
#ifdef CONFIG_FB_MXC_INTERNAL_MEM
static struct clk *iram_clk;
#endif
LIST_HEAD(fb_alloc_list);

static uint32_t bpp_to_pixfmt(int bpp)
{
	uint32_t pixfmt = 0;
	switch (bpp) {
	case 24:
		pixfmt = IPU_PIX_FMT_BGR24;
		break;
	case 32:
		pixfmt = IPU_PIX_FMT_BGR32;
		break;
	case 16:
		pixfmt = IPU_PIX_FMT_RGB565;
		break;
	}
	return pixfmt;
}

extern void gpio_lcd_active(void);
extern void gpio_lcd_inactive(void);
static irqreturn_t mxcfb_irq_handler(int irq, void *dev_id);
static int mxcfb_blank(int blank, struct fb_info *info);
static int mxcfb_map_video_memory(struct fb_info *fbi, bool use_internal_ram);
static int mxcfb_unmap_video_memory(struct fb_info *fbi);

/*
 * Set fixed framebuffer parameters based on variable settings.
 *
 * @param       info     framebuffer information pointer
 */
static int mxcfb_set_fix(struct fb_info *info)
{
	struct fb_fix_screeninfo *fix = &info->fix;
	struct fb_var_screeninfo *var = &info->var;
	struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)info->par;

	if (mxc_fbi->ipu_ch == MEM_SDC_FG)
		strncpy(fix->id, "DISP3 FG", 8);
	else
		strncpy(fix->id, "DISP3 BG", 8);

	fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;

	fix->type = FB_TYPE_PACKED_PIXELS;
	fix->accel = FB_ACCEL_NONE;
	fix->visual = FB_VISUAL_TRUECOLOR;
	fix->xpanstep = 1;
	fix->ypanstep = 1;

	return 0;
}

/*
 * Set framebuffer parameters and change the operating mode.
 *
 * @param       info     framebuffer information pointer
 */
static int mxcfb_set_par(struct fb_info *fbi)
{
	int retval;
	bool use_iram = false;
	u32 mem_len;
	ipu_di_signal_cfg_t sig_cfg;
	ipu_panel_t mode = IPU_PANEL_TFT;
	struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)fbi->par;

	retval = wait_event_interruptible(mxcfb_drv_data.suspend_wq, (mxcfb_drv_data.suspended == false));
	if (retval < 0)
		return retval;

	ipu_disable_irq(mxc_fbi->ipu_ch_irq);
	ipu_disable_channel(mxc_fbi->ipu_ch, true);
	ipu_uninit_channel(mxc_fbi->ipu_ch);
	ipu_clear_irq(mxc_fbi->ipu_ch_irq);
	mxcfb_set_fix(fbi);

	mem_len = fbi->var.yres_virtual * fbi->fix.line_length;
	if (mem_len > fbi->fix.smem_len) {
		if (fbi->fix.smem_start)
			mxcfb_unmap_video_memory(fbi);

#ifdef CONFIG_FB_MXC_INTERNAL_MEM
		if (mxc_fbi->ipu_ch == MEM_SDC_BG) {
			use_iram = true;
		}
#endif
		if (mxcfb_map_video_memory(fbi, use_iram) < 0)
			return -ENOMEM;
	}

	ipu_init_channel(mxc_fbi->ipu_ch, NULL);

	/* Clear the screen */
	memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);

	if (mxc_fbi->ipu_ch == MEM_SDC_BG) {
		memset(&sig_cfg, 0, sizeof(sig_cfg));
		if (fbi->var.sync & FB_SYNC_HOR_HIGH_ACT)
			sig_cfg.Hsync_pol = true;
		if (fbi->var.sync & FB_SYNC_VERT_HIGH_ACT)
			sig_cfg.Vsync_pol = true;
		if (!(fbi->var.sync & FB_SYNC_CLK_LAT_FALL))
			sig_cfg.clk_pol = true;
		if (fbi->var.sync & FB_SYNC_DATA_INVERT)
			sig_cfg.data_pol = true;
		if (!(fbi->var.sync & FB_SYNC_OE_LOW_ACT))
			sig_cfg.enable_pol = true;
		if (fbi->var.sync & FB_SYNC_CLK_IDLE_EN)
			sig_cfg.clkidle_en = true;
		if (fbi->var.sync & FB_SYNC_SHARP_MODE)
			mode = IPU_PANEL_SHARP_TFT;

		dev_dbg(fbi->device, "pixclock = %ul Hz\n",
			(u32) (PICOS2KHZ(fbi->var.pixclock) * 1000UL));

		if (ipu_sdc_init_panel(mode,
				       (PICOS2KHZ(fbi->var.pixclock)) * 1000UL,
				       fbi->var.xres, fbi->var.yres,
				       (fbi->var.sync & FB_SYNC_SWAP_RGB) ?
				       IPU_PIX_FMT_BGR666 : IPU_PIX_FMT_RGB666,
				       fbi->var.left_margin,
				       fbi->var.hsync_len,
				       fbi->var.right_margin,
				       fbi->var.upper_margin,
				       fbi->var.vsync_len,
				       fbi->var.lower_margin, sig_cfg) != 0) {
			dev_err(fbi->device,
				"mxcfb: Error initializing panel.\n");
			return -EINVAL;
		}

		fbi->mode =
		    (struct fb_videomode *)fb_match_mode(&fbi->var,
							 &fbi->modelist);
	}

	ipu_disp_set_window_pos(mxc_fbi->ipu_ch, 0, 0);

	mxc_fbi->cur_ipu_buf = 1;
	sema_init(&mxc_fbi->flip_sem, 1);
	fbi->var.xoffset = fbi->var.yoffset = 0;

	retval = ipu_init_channel_buffer(mxc_fbi->ipu_ch, IPU_INPUT_BUFFER,
					 bpp_to_pixfmt(fbi->var.bits_per_pixel),
					 fbi->var.xres, fbi->var.yres,
					 fbi->var.xres_virtual,
					 IPU_ROTATE_NONE,
					 fbi->fix.smem_start +
					 (fbi->fix.line_length * fbi->var.yres),
					 fbi->fix.smem_start,
					 0, 0);
	if (retval) {
		dev_err(fbi->device,
			"ipu_init_channel_buffer error %d\n", retval);
		return retval;
	}

	if (mxc_fbi->blank == FB_BLANK_UNBLANK) {
		ipu_enable_channel(mxc_fbi->ipu_ch);
	}

	return 0;
}

/*
 * Check framebuffer variable parameters and adjust to valid values.
 *
 * @param       var      framebuffer variable parameters
 *
 * @param       info     framebuffer information pointer
 */
static int mxcfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	u32 vtotal;
	u32 htotal;

	if (var->xres_virtual < var->xres)
		var->xres_virtual = var->xres;
	if (var->yres_virtual < var->yres)
		var->yres_virtual = var->yres;

#ifdef CONFIG_FB_MXC_INTERNAL_MEM
	if ((info->fix.smem_start == FB_RAM_BASE_ADDR) &&
	    ((var->yres_virtual * var->xres_virtual * var->bits_per_pixel / 8) >
	     FB_RAM_SIZE)) {
		return -EINVAL;
	}
#endif

	if ((var->bits_per_pixel != 32) && (var->bits_per_pixel != 24) &&
	    (var->bits_per_pixel != 16)) {
		var->bits_per_pixel = default_bpp;
	}

	switch (var->bits_per_pixel) {
	case 16:
		var->red.length = 5;
		var->red.offset = 11;
		var->red.msb_right = 0;

		var->green.length = 6;
		var->green.offset = 5;
		var->green.msb_right = 0;

		var->blue.length = 5;
		var->blue.offset = 0;
		var->blue.msb_right = 0;

		var->transp.length = 0;
		var->transp.offset = 0;
		var->transp.msb_right = 0;
		break;
	case 24:
		var->red.length = 8;
		var->red.offset = 16;
		var->red.msb_right = 0;

		var->green.length = 8;
		var->green.offset = 8;
		var->green.msb_right = 0;

		var->blue.length = 8;
		var->blue.offset = 0;
		var->blue.msb_right = 0;

		var->transp.length = 0;
		var->transp.offset = 0;
		var->transp.msb_right = 0;
		break;
	case 32:
		var->red.length = 8;
		var->red.offset = 16;
		var->red.msb_right = 0;

		var->green.length = 8;
		var->green.offset = 8;
		var->green.msb_right = 0;

		var->blue.length = 8;
		var->blue.offset = 0;
		var->blue.msb_right = 0;

		var->transp.length = 8;
		var->transp.offset = 24;
		var->transp.msb_right = 0;
		break;
	}

	if (var->pixclock < 1000) {
		htotal = var->xres + var->right_margin + var->hsync_len +
		    var->left_margin;
		vtotal = var->yres + var->lower_margin + var->vsync_len +
		    var->upper_margin;
		var->pixclock = (vtotal * htotal * 6UL) / 100UL;
		var->pixclock = KHZ2PICOS(var->pixclock);
		dev_dbg(info->device,
			"pixclock set for 60Hz refresh = %u ps\n",
			var->pixclock);
	}

	var->height = -1;
	var->width = -1;
	var->grayscale = 0;

	/* nonstd used for YUV formats, but only RGB supported */
	var->nonstd = 0;

	return 0;
}

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

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

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

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

	case FB_VISUAL_STATIC_PSEUDOCOLOR:
	case FB_VISUAL_PSEUDOCOLOR:
		break;
	}

	return ret;
}

/*
 * Function to handle custom ioctls for MXC framebuffer.
 *
 * @param       inode   inode struct
 *
 * @param       file    file struct
 *
 * @param       cmd     Ioctl command to handle
 *
 * @param       arg     User pointer to command arguments
 *
 * @param       fbi     framebuffer information pointer
 */
static int mxcfb_ioctl(struct fb_info *fbi, unsigned int cmd, unsigned long arg)
{
	int retval = 0;
	int __user *argp = (void __user *)arg;

	retval = wait_event_interruptible(mxcfb_drv_data.suspend_wq,
					 (mxcfb_drv_data.suspended ==
					false));
	if (retval < 0)
		return retval;

	switch (cmd) {
	case MXCFB_SET_GBL_ALPHA:
		{
			struct mxcfb_gbl_alpha ga;
			if (copy_from_user(&ga, (void *)arg, sizeof(ga))) {
				retval = -EFAULT;
				break;
			}
			retval =
			    ipu_sdc_set_global_alpha((bool) ga.enable,
						     ga.alpha);
			dev_dbg(fbi->device, "Set global alpha to %d\n",
				ga.alpha);
			break;
		}
	case MXCFB_SET_CLR_KEY:
		{
			struct mxcfb_color_key key;
			if (copy_from_user(&key, (void *)arg, sizeof(key))) {
				retval = -EFAULT;
				break;
			}
			retval = ipu_sdc_set_color_key(MEM_SDC_BG, key.enable,
						       key.color_key);
			dev_dbg(fbi->device, "Set color key to 0x%08X\n",
				key.color_key);
			break;
		}
	case MXCFB_WAIT_FOR_VSYNC:
		{
#ifndef CONFIG_ARCH_MX3
			mxcfb_drv_data.vsync_flag = 0;
			ipu_enable_irq(IPU_IRQ_SDC_DISP3_VSYNC);
			if (!wait_event_interruptible_timeout
			    (mxcfb_drv_data.vsync_wq,
			     mxcfb_drv_data.vsync_flag != 0, 1 * HZ)) {
				dev_err(fbi->device,
					"MXCFB_WAIT_FOR_VSYNC: timeout\n");
				retval = -ETIME;
				break;
			} else if (signal_pending(current)) {
				dev_err(fbi->device,
					"MXCFB_WAIT_FOR_VSYNC: interrupt received\n");
				retval = -ERESTARTSYS;
				break;
			}
#endif
			break;
		}
	case MXCFB_GET_FB_IPU_CHAN:
		{
			struct mxcfb_info *mxc_fbi =
				(struct mxcfb_info *)fbi->par;

			if (put_user(mxc_fbi->ipu_ch, argp))
				return -EFAULT;

			break;
		}
	default:
		retval = -EINVAL;
	}
	return retval;
}

/*
 * Function to handle custom ioctls for MXC framebuffer.
 *
 * @param       inode   inode struct
 *
 * @param       file    file struct
 *
 * @param       cmd     Ioctl command to handle
 *
 * @param       arg     User pointer to command arguments
 *
 * @param       fbi     framebuffer information pointer
 */
static int mxcfb_ioctl_ovl(struct fb_info *fbi, unsigned int cmd,
			   unsigned long arg)
{
	int retval = 0;
	int __user *argp = (void __user *)arg;
	struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)fbi->par;

	retval = wait_event_interruptible(mxcfb_drv_data.suspend_wq,
				 (mxcfb_drv_data.suspended == false));
	if (retval < 0)
		return retval;

	switch (cmd) {
	case FBIO_ALLOC:
		{
			int size;
			struct mxcfb_alloc_list *mem;

			mem = kzalloc(sizeof(*mem), GFP_KERNEL);
			if (mem == NULL)
				return -ENOMEM;

			if (get_user(size, argp))
				return -EFAULT;

			mem->size = PAGE_ALIGN(size);

			mem->cpu_addr = dma_alloc_coherent(fbi->device, size,
							   &mem->phy_addr,
							   GFP_DMA);
			if (mem->cpu_addr == NULL) {
				kfree(mem);
				return -ENOMEM;
			}

			list_add(&mem->list, &fb_alloc_list);

			dev_dbg(fbi->device, "allocated %d bytes @ 0x%08X\n",
				mem->size, mem->phy_addr);

			if (put_user(mem->phy_addr, argp))
				return -EFAULT;

			break;
		}
	case FBIO_FREE:
		{
			unsigned long offset;
			struct mxcfb_alloc_list *mem;

			if (get_user(offset, argp))
				return -EFAULT;

			retval = -EINVAL;
			list_for_each_entry(mem, &fb_alloc_list, list) {
				if (mem->phy_addr == offset) {
					list_del(&mem->list);
					dma_free_coherent(fbi->device,
							  mem->size,
							  mem->cpu_addr,
							  mem->phy_addr);
					kfree(mem);
					retval = 0;
					break;
				}
			}

			break;
		}
	case MXCFB_SET_OVERLAY_POS:
		{
			struct mxcfb_pos pos;
			if (copy_from_user(&pos, (void *)arg, sizeof(pos))) {
				retval = -EFAULT;
				break;
			}
			retval = ipu_disp_set_window_pos(mxc_fbi->ipu_ch,
							pos.x, pos.y);
			break;
		}
	case MXCFB_GET_FB_IPU_CHAN:
		{
			struct mxcfb_info *mxc_fbi =
				(struct mxcfb_info *)fbi->par;

			if (put_user(mxc_fbi->ipu_ch, argp))
				return -EFAULT;

			break;
		}
	default:
		retval = -EINVAL;
	}
	return retval;
}

/*
 * mxcfb_blank():
 *      Blank the display.
 */
static int mxcfb_blank(int blank, struct fb_info *info)
{
	int retval;
	struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)info->par;

	dev_dbg(info->device, "blank = %d\n", blank);

	if (mxc_fbi->blank == blank)
		return 0;

	retval = wait_event_interruptible(mxcfb_drv_data.suspend_wq,
				 (mxcfb_drv_data.suspended == false));
	if (retval < 0)
		return retval;

	mxc_fbi->blank = blank;

	switch (blank) {
	case FB_BLANK_POWERDOWN:
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
	case FB_BLANK_NORMAL:
		ipu_disable_channel(MEM_SDC_BG, true);
		gpio_lcd_inactive();
		break;
	case FB_BLANK_UNBLANK:
		gpio_lcd_active();
		ipu_enable_channel(MEM_SDC_BG);
		break;
	}
	return 0;
}

/*
 * mxcfb_blank_ovl():
 *      Blank the display.
 */
static int mxcfb_blank_ovl(int blank, struct fb_info *info)
{
	int retval;
	struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)info->par;

	dev_dbg(info->device, "ovl blank = %d\n", blank);

	if (mxc_fbi->blank == blank)
		return 0;

	retval = wait_event_interruptible(mxcfb_drv_data.suspend_wq,
				 (mxcfb_drv_data.suspended == false));
	if (retval < 0)
		return retval;

	mxc_fbi->blank = blank;

	switch (blank) {
	case FB_BLANK_POWERDOWN:
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
	case FB_BLANK_NORMAL:
		ipu_disable_channel(MEM_SDC_FG, true);
		break;
	case FB_BLANK_UNBLANK:
		ipu_enable_channel(MEM_SDC_FG);
		break;
	}
	return 0;
}

/*
 * Pan or Wrap the Display
 *
 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
 *
 * @param               var     Variable screen buffer information
 * @param               info    Framebuffer information pointer
 */
static int
mxcfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
{
	struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)info->par;
	unsigned long lock_flags = 0;
	int retval;
	u_int y_bottom;
	unsigned long base;

	retval = wait_event_interruptible(mxcfb_drv_data.suspend_wq,
				 (mxcfb_drv_data.suspended == false));
	if (retval < 0)
		return retval;

	if (var->xoffset > 0) {
		dev_dbg(info->device, "x panning not supported\n");
		return -EINVAL;
	}

	if ((info->var.xoffset == var->xoffset) &&
	    (info->var.yoffset == var->yoffset)) {
		/* No change, do nothing */
		return 0;
	}

	y_bottom = var->yoffset;

	if (!(var->vmode & FB_VMODE_YWRAP)) {
		y_bottom += var->yres;
	}

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

	base = (var->yoffset * var->xres_virtual + var->xoffset);
	base *= (var->bits_per_pixel) / 8;
	base += info->fix.smem_start;

	down(&mxc_fbi->flip_sem);

	spin_lock_irqsave(&mxc_fbi->fb_lock, lock_flags);

	dev_dbg(info->device, "Updating SDC BG buf %d address=0x%08lX\n",
		mxc_fbi->cur_ipu_buf, base);

	mxc_fbi->cur_ipu_buf = !mxc_fbi->cur_ipu_buf;
	if (ipu_update_channel_buffer(mxc_fbi->ipu_ch, IPU_INPUT_BUFFER,
				      mxc_fbi->cur_ipu_buf, base) == 0) {
		ipu_select_buffer(mxc_fbi->ipu_ch, IPU_INPUT_BUFFER,
				  mxc_fbi->cur_ipu_buf);
		ipu_clear_irq(mxc_fbi->ipu_ch_irq);
		ipu_enable_irq(mxc_fbi->ipu_ch_irq);
	} else {
		dev_err(info->device,
			"Error updating SDC buf %d to address=0x%08lX\n",
			mxc_fbi->cur_ipu_buf, base);
	}

	spin_unlock_irqrestore(&mxc_fbi->fb_lock, lock_flags);

	dev_dbg(info->device, "Update complete\n");

	info->var.xoffset = var->xoffset;
	info->var.yoffset = var->yoffset;

	if (var->vmode & FB_VMODE_YWRAP) {
		info->var.vmode |= FB_VMODE_YWRAP;
	} else {
		info->var.vmode &= ~FB_VMODE_YWRAP;
	}

	return 0;
}

/*
 * Function to handle custom mmap for MXC framebuffer.
 *
 * @param       fbi     framebuffer information pointer
 *
 * @param       vma     Pointer to vm_area_struct
 */
static int mxcfb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
{
	bool found = false;
	u32 len;
	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
	struct mxcfb_alloc_list *mem;

	if (offset < fbi->fix.smem_len) {
		/* mapping framebuffer memory */
		len = fbi->fix.smem_len - offset;
		vma->vm_pgoff = (fbi->fix.smem_start + offset) >> PAGE_SHIFT;
	} else {
		list_for_each_entry(mem, &fb_alloc_list, list) {
			if (offset == mem->phy_addr) {
				found = true;
				len = mem->size;
				break;
			}
		}
		if (!found) {
			return -EINVAL;
		}
	}

	len = PAGE_ALIGN(len);
	if (vma->vm_end - vma->vm_start > len) {
		return -EINVAL;
	}

	/* make buffers write-thru cacheable */
	vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot) &
				     ~L_PTE_BUFFERABLE);

	vma->vm_flags |= VM_IO | VM_RESERVED;

	if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
			    vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
		dev_dbg(fbi->device, "mmap remap_pfn_range failed\n");
		return -ENOBUFS;

	}

	return 0;
}

/*!
 * This structure contains the pointers to the control functions that are
 * invoked by the core framebuffer driver to perform operations like
 * blitting, rectangle filling, copy regions and cursor definition.
 */
static struct fb_ops mxcfb_ops = {
	.owner = THIS_MODULE,
	.fb_set_par = mxcfb_set_par,
	.fb_check_var = mxcfb_check_var,
	.fb_setcolreg = mxcfb_setcolreg,
	.fb_pan_display = mxcfb_pan_display,
	.fb_ioctl = mxcfb_ioctl,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
	.fb_blank = mxcfb_blank,
};

static struct fb_ops mxcfb_ovl_ops = {
	.owner = THIS_MODULE,
	.fb_set_par = mxcfb_set_par,
	.fb_check_var = mxcfb_check_var,
	.fb_setcolreg = mxcfb_setcolreg,
	.fb_pan_display = mxcfb_pan_display,
	.fb_ioctl = mxcfb_ioctl_ovl,
	.fb_mmap = mxcfb_mmap,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
	.fb_blank = mxcfb_blank_ovl,
};

static irqreturn_t mxcfb_vsync_irq_handler(int irq, void *dev_id)
{
	struct mxcfb_data *fb_data = dev_id;

	ipu_disable_irq(irq);

	fb_data->vsync_flag = 1;
	wake_up_interruptible(&fb_data->vsync_wq);
	return IRQ_HANDLED;
}

static irqreturn_t mxcfb_irq_handler(int irq, void *dev_id)
{
	struct fb_info *fbi = dev_id;
	struct mxcfb_info *mxc_fbi = fbi->par;

	up(&mxc_fbi->flip_sem);
	ipu_disable_irq(irq);
	return IRQ_HANDLED;
}

#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.
 */

/*
 * Suspends the framebuffer and blanks the screen. Power management support
 */
static int mxcfb_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct mxcfb_data *drv_data = platform_get_drvdata(pdev);
	struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)drv_data->fbi->par;
	struct mxcfb_info *mxc_fbi_ovl =
	    (struct mxcfb_info *)drv_data->fbi_ovl->par;
#ifdef CONFIG_FB_MXC_LOW_PWR_DISPLAY
	void *fbmem;
#endif

	drv_data->suspended = true;

	console_lock();
	fb_set_suspend(drv_data->fbi, 1);
	fb_set_suspend(drv_data->fbi_ovl, 1);
	console_unlock();

	if (mxc_fbi_ovl->blank == FB_BLANK_UNBLANK) {
		ipu_disable_channel(MEM_SDC_FG, true);
	}

	if (mxc_fbi->blank == FB_BLANK_UNBLANK) {
#ifdef CONFIG_FB_MXC_LOW_PWR_DISPLAY
		if (drv_data->fbi->fix.smem_start != FB_RAM_BASE_ADDR) {
			fbmem = ioremap(FB_RAM_BASE_ADDR, FB_RAM_SIZE);
			memcpy(fbmem, drv_data->fbi->screen_base, FB_RAM_SIZE);
			iounmap(fbmem);
			mxc_fbi->cur_ipu_buf = !mxc_fbi->cur_ipu_buf;
			ipu_update_channel_buffer(MEM_SDC_BG, IPU_INPUT_BUFFER,
						  mxc_fbi->cur_ipu_buf,
						  FB_RAM_BASE_ADDR);
			ipu_select_buffer(MEM_SDC_BG, IPU_INPUT_BUFFER,
					  mxc_fbi->cur_ipu_buf);
		}
		ipu_lowpwr_display_enable();
#else
		ipu_disable_channel(MEM_SDC_BG, true);
		gpio_lcd_inactive();
#endif
	}
	return 0;
}

/*
 * Resumes the framebuffer and unblanks the screen. Power management support
 */
static int mxcfb_resume(struct platform_device *pdev)
{
	struct mxcfb_data *drv_data = platform_get_drvdata(pdev);
	struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)drv_data->fbi->par;
	struct mxcfb_info *mxc_fbi_ovl =
	    (struct mxcfb_info *)drv_data->fbi_ovl->par;

	drv_data->suspended = false;

	if (mxc_fbi->blank == FB_BLANK_UNBLANK) {
#ifdef CONFIG_FB_MXC_LOW_PWR_DISPLAY
		ipu_lowpwr_display_disable();
		if (drv_data->fbi->fix.smem_start != FB_RAM_BASE_ADDR) {
			mxc_fbi->cur_ipu_buf = !mxc_fbi->cur_ipu_buf;
			ipu_update_channel_buffer(MEM_SDC_BG, IPU_INPUT_BUFFER,
						  mxc_fbi->cur_ipu_buf,
						  drv_data->fbi->fix.
						  smem_start);
			ipu_select_buffer(MEM_SDC_BG, IPU_INPUT_BUFFER,
					  mxc_fbi->cur_ipu_buf);
		}
#else
		gpio_lcd_active();
		ipu_enable_channel(MEM_SDC_BG);
#endif
	}

	if (mxc_fbi_ovl->blank == FB_BLANK_UNBLANK) {
		ipu_enable_channel(MEM_SDC_FG);
	}

	console_lock();
	fb_set_suspend(drv_data->fbi, 0);
	fb_set_suspend(drv_data->fbi_ovl, 0);
	console_unlock();

	wake_up_interruptible(&drv_data->suspend_wq);
	return 0;
}
#else
#define mxcfb_suspend   NULL
#define mxcfb_resume    NULL
#endif

/*
 * Main framebuffer functions
 */

/*!
 * 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.
 *
 * @param       fbi     framebuffer information pointer
 *
 * @param       use_internal_ram flag on whether to use internal RAM for memory
 *
 * @return      Error code indicating success or failure
 */
static int mxcfb_map_video_memory(struct fb_info *fbi, bool use_internal_ram)
{
	int retval = 0;

#ifdef CONFIG_FB_MXC_INTERNAL_MEM
	if (use_internal_ram) {
		fbi->fix.smem_len = FB_RAM_SIZE;
		fbi->fix.smem_start = FB_RAM_BASE_ADDR;
		if (fbi->fix.smem_len <
		    (fbi->var.yres_virtual * fbi->fix.line_length)) {
			dev_err(fbi->device,
				"Not enough internal RAM for framebuffer configuration\n");
			retval = -EINVAL;
			goto err0;
		}

		if (request_mem_region(fbi->fix.smem_start, fbi->fix.smem_len,
				       fbi->device->driver->name) == NULL) {
			dev_err(fbi->device,
				"Unable to request internal RAM\n");
			retval = -ENOMEM;
			goto err0;
		}

		fbi->screen_base = ioremap(fbi->fix.smem_start,
					 fbi->fix.smem_len);
		if (!fbi->screen_base) {
			dev_err(fbi->device,
				"Unable to map fb memory to virtual address\n");
			release_mem_region(fbi->fix.smem_start,
					   fbi->fix.smem_len);
			retval = -EIO;
			goto err0;
		}

		iram_clk = clk_get(NULL, "iram_clk");
		clk_enable(iram_clk);
	} else
#endif
	{
		fbi->fix.smem_len = fbi->var.yres_virtual *
		    fbi->fix.line_length;
		fbi->screen_base =
		    dma_alloc_writecombine(fbi->device,
					   fbi->fix.smem_len,
					   (dma_addr_t *) &fbi->fix.smem_start,
					   GFP_DMA);

		if (fbi->screen_base == 0) {
			dev_err(fbi->device,
				"Unable to allocate framebuffer memory\n");
			retval = -EBUSY;
			goto err0;
		}
	}

	dev_dbg(fbi->device, "allocated fb @ paddr=0x%08X, size=%d.\n",
		(uint32_t) fbi->fix.smem_start, fbi->fix.smem_len);

	fbi->screen_size = fbi->fix.smem_len;

	/* Clear the screen */
	memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);

	return 0;

      err0:
	fbi->fix.smem_len = 0;
	fbi->fix.smem_start = 0;
	fbi->screen_base = NULL;
	return retval;
}

/*!
 * De-allocates the DRAM memory for the frame buffer.
 *
 * @param       fbi     framebuffer information pointer
 *
 * @return      Error code indicating success or failure
 */
static int mxcfb_unmap_video_memory(struct fb_info *fbi)
{
#ifdef CONFIG_FB_MXC_INTERNAL_MEM
	if (fbi->fix.smem_start == FB_RAM_BASE_ADDR) {
		iounmap(fbi->screen_base);
		release_mem_region(fbi->fix.smem_start, fbi->fix.smem_len);
		fbi->fix.smem_start = 0;
		fbi->fix.smem_len = 0;
		clk_disable(iram_clk);
	} else
#endif
	{
		dma_free_writecombine(fbi->device, fbi->fix.smem_len,
				      fbi->screen_base, fbi->fix.smem_start);
	}
	fbi->screen_base = 0;
	fbi->fix.smem_start = 0;
	fbi->fix.smem_len = 0;
	return 0;
}

/*!
 * Initializes the framebuffer information pointer. After allocating
 * sufficient memory for the framebuffer structure, the fields are
 * filled with custom information passed in from the configurable
 * structures.  This includes information such as bits per pixel,
 * color maps, screen width/height and RGBA offsets.
 *
 * @return      Framebuffer structure initialized with our information
 */
static struct fb_info *mxcfb_init_fbinfo(struct device *dev, struct fb_ops *ops)
{
	struct fb_info *fbi;
	struct mxcfb_info *mxcfbi;

	/*
	 * Allocate sufficient memory for the fb structure
	 */
	fbi = framebuffer_alloc(sizeof(struct mxcfb_info), dev);
	if (!fbi)
		return NULL;

	mxcfbi = (struct mxcfb_info *)fbi->par;

	fbi->var.activate = FB_ACTIVATE_NOW;

	fbi->fbops = ops;
	fbi->flags = FBINFO_FLAG_DEFAULT;
	fbi->pseudo_palette = mxcfbi->pseudo_palette;

	spin_lock_init(&mxcfbi->fb_lock);

	/*
	 * Allocate colormap
	 */
	fb_alloc_cmap(&fbi->cmap, 16, 0);

	return fbi;
}

/*!
 * Probe routine for the framebuffer driver. It is called during the
 * driver binding process.      The following functions are performed in
 * this routine: Framebuffer initialization, Memory allocation and
 * mapping, Framebuffer registration, IPU initialization.
 *
 * @return      Appropriate error code to the kernel common code
 */
static int mxcfb_probe(struct platform_device *pdev)
{
	char *mode = pdev->dev.platform_data;
	struct fb_info *fbi;
	struct mxcfb_info *mxcfbi;
	struct fb_info *fbi_ovl;
	int ret = 0;

	/*
	 * Initialize FB structures
	 */
	fbi = mxcfb_init_fbinfo(&pdev->dev, &mxcfb_ops);
	if (!fbi) {
		ret = -ENOMEM;
		goto err0;
	}
	mxcfbi = (struct mxcfb_info *)fbi->par;

	mxcfbi->ipu_ch_irq = IPU_IRQ_SDC_BG_EOF;
	mxcfbi->cur_ipu_buf = 0;
	mxcfbi->ipu_ch = MEM_SDC_BG;

	ipu_sdc_set_global_alpha(true, 0xFF);
	ipu_sdc_set_color_key(MEM_SDC_BG, false, 0);

	if (ipu_request_irq(IPU_IRQ_SDC_BG_EOF, mxcfb_irq_handler, 0,
			    MXCFB_NAME, fbi) != 0) {
		dev_err(&pdev->dev, "Error registering BG irq handler.\n");
		ret = -EBUSY;
		goto err1;
	}
	ipu_disable_irq(IPU_IRQ_SDC_BG_EOF);

	if (fb_mode == NULL) {
		fb_mode = mode;
	}

	if (!fb_find_mode(&fbi->var, fbi, fb_mode, mxcfb_modedb,
			  mxcfb_modedb_sz, NULL, default_bpp)) {
		ret = -EBUSY;
		goto err2;
	}
	fb_videomode_to_modelist(mxcfb_modedb, mxcfb_modedb_sz, &fbi->modelist);

	/* Default Y virtual size is 2x panel size */
#ifndef CONFIG_FB_MXC_INTERNAL_MEM
	fbi->var.yres_virtual = fbi->var.yres * 2;
#endif

	mxcfb_drv_data.fbi = fbi;
	mxcfb_drv_data.backlight_level = 255;
	mxcfb_drv_data.suspended = false;
	init_waitqueue_head(&mxcfb_drv_data.suspend_wq);

	mxcfbi->blank = FB_BLANK_NORMAL;
	ret = mxcfb_set_par(fbi);
	if (ret < 0) {
		goto err2;
	}
	mxcfb_blank(FB_BLANK_UNBLANK, fbi);

	/*
	 * Register framebuffer
	 */
	ret = register_framebuffer(fbi);
	if (ret < 0) {
		goto err2;
	}

	/*
	 * Initialize Overlay FB structures
	 */
	fbi_ovl = mxcfb_init_fbinfo(&pdev->dev, &mxcfb_ovl_ops);
	if (!fbi_ovl) {
		ret = -ENOMEM;
		goto err3;
	}
	mxcfb_drv_data.fbi_ovl = fbi_ovl;
	mxcfbi = (struct mxcfb_info *)fbi_ovl->par;

	mxcfbi->ipu_ch_irq = IPU_IRQ_SDC_FG_EOF;
	mxcfbi->cur_ipu_buf = 0;
	mxcfbi->ipu_ch = MEM_SDC_FG;

	if (ipu_request_irq(IPU_IRQ_SDC_FG_EOF, mxcfb_irq_handler, 0,
			    MXCFB_NAME, fbi_ovl) != 0) {
		dev_err(fbi->device, "Error registering FG irq handler.\n");
		ret = -EBUSY;
		goto err4;
	}
	ipu_disable_irq(mxcfbi->ipu_ch_irq);

	/* Default Y virtual size is 2x panel size */
	fbi_ovl->var = fbi->var;
	fbi_ovl->var.yres_virtual = fbi->var.yres * 2;

	/* Overlay is blanked by default */
	mxcfbi->blank = FB_BLANK_NORMAL;

	ret = mxcfb_set_par(fbi_ovl);
	if (ret < 0) {
		goto err5;
	}

	/*
	 * Register overlay framebuffer
	 */
	ret = register_framebuffer(fbi_ovl);
	if (ret < 0) {
		goto err5;
	}

	platform_set_drvdata(pdev, &mxcfb_drv_data);

	init_waitqueue_head(&mxcfb_drv_data.vsync_wq);
	if (!cpu_is_mx31() && !cpu_is_mx32()) {
		ret = ipu_request_irq(IPU_IRQ_SDC_DISP3_VSYNC,
					   mxcfb_vsync_irq_handler,
					   0, MXCFB_NAME,
					   &mxcfb_drv_data);
		if (ret < 0)
			goto err6;
		ipu_disable_irq(IPU_IRQ_SDC_DISP3_VSYNC);
	}

	printk(KERN_INFO "mxcfb: fb registered, using mode %s\n", fb_mode);
	return 0;

      err6:
	unregister_framebuffer(fbi_ovl);
      err5:
	ipu_free_irq(IPU_IRQ_SDC_FG_EOF, fbi_ovl);
      err4:
	fb_dealloc_cmap(&fbi_ovl->cmap);
	framebuffer_release(fbi_ovl);
      err3:
	unregister_framebuffer(fbi);
      err2:
	ipu_free_irq(IPU_IRQ_SDC_BG_EOF, fbi);
      err1:
	fb_dealloc_cmap(&fbi->cmap);
	framebuffer_release(fbi);
      err0:
	printk(KERN_ERR "mxcfb: failed to register fb\n");
	return ret;
}

/*!
 * This structure contains pointers to the power management callback functions.
 */
static struct platform_driver mxcfb_driver = {
	.driver = {
		   .name = MXCFB_NAME,
		   },
	.probe = mxcfb_probe,
	.suspend = mxcfb_suspend,
	.resume = mxcfb_resume,
};

/*
 * Parse user specified options (`video=trident:')
 * example:
 * 	video=trident:800x600,bpp=16,noaccel
 */
int mxcfb_setup(char *options)
{
	char *opt;
	if (!options || !*options)
		return 0;
	while ((opt = strsep(&options, ",")) != NULL) {
		if (!*opt)
			continue;
		if (!strncmp(opt, "bpp=", 4))
			default_bpp = simple_strtoul(opt + 4, NULL, 0);
		else
			fb_mode = opt;
	}
	return 0;
}

/*!
 * Main entry function for the framebuffer. The function registers the power
 * management callback functions with the kernel and also registers the MXCFB
 * callback functions with the core Linux framebuffer driver \b fbmem.c
 *
 * @return      Error code indicating success or failure
 */
int __init mxcfb_init(void)
{
	int ret = 0;
#ifndef MODULE
	char *option = NULL;
#endif

#ifndef MODULE
	if (fb_get_options("mxcfb", &option))
		return -ENODEV;
	mxcfb_setup(option);
#endif

	ret = platform_driver_register(&mxcfb_driver);
	return ret;
}

void mxcfb_exit(void)
{
	struct fb_info *fbi = mxcfb_drv_data.fbi;

	if (fbi) {
		mxcfb_unmap_video_memory(fbi);

		if (&fbi->cmap)
			fb_dealloc_cmap(&fbi->cmap);

		unregister_framebuffer(fbi);
		framebuffer_release(fbi);
	}

	fbi = mxcfb_drv_data.fbi_ovl;
	if (fbi) {
		mxcfb_unmap_video_memory(fbi);

		if (&fbi->cmap)
			fb_dealloc_cmap(&fbi->cmap);

		unregister_framebuffer(fbi);
		framebuffer_release(fbi);
	}
#ifndef CONFIG_ARCH_MX3
	ipu_free_irq(IPU_IRQ_SDC_DISP3_VSYNC, &mxcfb_drv_data);
#endif

	platform_driver_unregister(&mxcfb_driver);
}

module_init(mxcfb_init);
module_exit(mxcfb_exit);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("MXC framebuffer driver");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("fb");