summaryrefslogtreecommitdiff
path: root/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-fb.c
blob: 7bb2201f612099deda63ca2da26024e3d4b3fb9e (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
/* Smedia Glamo 336x/337x driver
 *
 * (C) 2007-2008 by Openmoko, Inc.
 * Author: Harald Welte <laforge@openmoko.org>
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/mfd/glamo.h>

#include <asm/div64.h>

#ifdef CONFIG_PM
#include <linux/pm.h>
#endif

#include <linux/glamofb.h>

#include "glamo-regs.h"
#include "glamo-core.h"

static void glamofb_program_mode(struct glamofb_handle* glamo);

struct glamofb_handle {
	struct glamo_core *core;
	struct fb_info *fb;
	struct device *dev;
	struct resource *reg;
	struct resource *fb_res;
	char __iomem *base;
	struct glamo_fb_platform_data *mach_info;
	char __iomem *cursor_addr;
	int cursor_on;
	u_int32_t pseudo_pal[16];
	spinlock_t lock_cmd;
	int blank_mode;
	int mode_set; /* 0 if the current display mode hasn't been set on the glamo */
	int output_enabled; /* 0 if the video output is disabled */
};

static void glamo_output_enable(struct glamofb_handle *gfb) {
	struct glamo_core *gcore = gfb->core;

	if (gfb->output_enabled)
		return;

	/* enable the pixel clock if off */
	glamo_engine_clkreg_set(gcore,
		GLAMO_ENGINE_LCD,
		GLAMO_CLOCK_LCD_EN_DCLK,
		GLAMO_CLOCK_LCD_EN_DCLK);

	gfb->output_enabled = 1;
	if (!gfb->mode_set)
		glamofb_program_mode(gfb);
}

static void glamo_output_disable(struct glamofb_handle *gfb) {
	struct glamo_core *gcore = gfb->core;

	if (!gfb->output_enabled)
		return;

	/* enable the pixel clock if off */
	glamo_engine_clkreg_set(gcore,
		GLAMO_ENGINE_LCD,
		GLAMO_CLOCK_LCD_EN_DCLK,
		0);

	gfb->output_enabled = 0;
}


static int reg_read(struct glamofb_handle *glamo,
			   u_int16_t reg)
{
	int i = 0;

	for (i = 0; i != 2; i++)
		nop();

	return readw(glamo->base + reg);
}

static void reg_write(struct glamofb_handle *glamo,
			     u_int16_t reg, u_int16_t val)
{
	int i = 0;

	for (i = 0; i != 2; i++)
		nop();

	writew(val, glamo->base + reg);
}

static struct glamo_script glamo_regs[] = {
	{ GLAMO_REG_LCD_MODE1, 0x0020 },
	/* no display rotation, no hardware cursor, no dither, no gamma,
	 * no retrace flip, vsync low-active, hsync low active,
	 * no TVCLK, no partial display, hw dest color from fb,
	 * no partial display mode, LCD1, software flip,  */
	{ GLAMO_REG_LCD_MODE2, 0x9020 },
	  /* video flip, no ptr, no ptr, dhclk off,
	   * normal mode,  no cpuif,
	   * res, serial msb first, single fb, no fr ctrl,
	   * cpu if bits all zero, no crc
	   * 0000 0000 0010  0000 */
	{ GLAMO_REG_LCD_MODE3, 0x0b40 },
	  /* src data rgb565, res, 18bit rgb666
	   * 000 01 011 0100 0000 */
	{ GLAMO_REG_LCD_POLARITY, 0x440c },
	  /* DE high active, no cpu/lcd if, cs0 force low, a0 low active,
	   * np cpu if, 9bit serial data, sclk rising edge latch data
	   * 01 00 0 100 0 000 01 0 0 */
	/* The following values assume 640*480@16bpp */
	{ GLAMO_REG_LCD_A_BASE1, 0x0000 }, /* display A base address 15:0 */
	{ GLAMO_REG_LCD_A_BASE2, 0x0000 }, /* display A base address 22:16 */
	{ GLAMO_REG_LCD_CURSOR_BASE1, 0xC000 }, /* cursor base address 15:0 */
	{ GLAMO_REG_LCD_CURSOR_BASE2, 0x0012 }, /* cursor base address 22:16 */
	{ GLAMO_REG_LCD_COMMAND2, 0x0000 }, /* display page A */
};

static int glamofb_run_script(struct glamofb_handle *glamo,
				struct glamo_script *script, int len)
{
	int i;

	if (glamo->core->suspending) {
		dev_err(&glamo->core->pdev->dev,
				"IGNORING glamofb_run_script while "
								 "suspended\n");
		return -EBUSY;
	}

	for (i = 0; i < len; i++) {
		struct glamo_script *line = &script[i];

		if (line->reg == 0xffff)
			return 0;
		else if (line->reg == 0xfffe)
			msleep(line->val);
		else
			reg_write(glamo, script[i].reg, script[i].val);
	}

	return 0;
}

static int glamofb_check_var(struct fb_var_screeninfo *var,
			     struct fb_info *info)
{
	struct glamofb_handle *glamo = info->par;

	if (glamo->core->suspending) {
		dev_err(&glamo->core->pdev->dev,
				"IGNORING glamofb_check_var while "
								 "suspended\n");
		return -EBUSY;
	}

	if (var->bits_per_pixel != 16)
		var->bits_per_pixel = 16;

	var->height = glamo->mach_info->height;
	var->width = glamo->mach_info->width;

	/* FIXME: set rgb positions */
	switch (var->bits_per_pixel) {
	case 16:
		switch (reg_read(glamo, GLAMO_REG_LCD_MODE3) & 0xc000) {
		case GLAMO_LCD_SRC_RGB565:
			var->red.offset		= 11;
			var->green.offset	= 5;
			var->blue.offset	= 0;
			var->red.length		= 5;
			var->green.length	= 6;
			var->blue.length	= 5;
			var->transp.length	= 0;
			break;
		case GLAMO_LCD_SRC_ARGB1555:
			var->transp.offset	= 15;
			var->red.offset		= 10;
			var->green.offset	= 5;
			var->blue.offset	= 0;
			var->transp.length	= 1;
			var->red.length		= 5;
			var->green.length	= 5;
			var->blue.length	= 5;
			break;
		case GLAMO_LCD_SRC_ARGB4444:
			var->transp.offset	= 12;
			var->red.offset		= 8;
			var->green.offset	= 4;
			var->blue.offset	= 0;
			var->transp.length	= 4;
			var->red.length		= 4;
			var->green.length	= 4;
			var->blue.length	= 4;
			break;
		}
		break;
	case 24:
	case 32:
	default:
		/* The Smedia Glamo doesn't support anything but 16bit color */
		printk(KERN_ERR
		       "Smedia driver does not [yet?] support 24/32bpp\n");
		return -EINVAL;
	}

	return 0;
}

static void reg_set_bit_mask(struct glamofb_handle *glamo,
			     u_int16_t reg, u_int16_t mask,
			     u_int16_t val)
{
	u_int16_t tmp;

	val &= mask;

	tmp = reg_read(glamo, reg);
	tmp &= ~mask;
	tmp |= val;
	reg_write(glamo, reg, tmp);
}

#define GLAMO_LCD_WIDTH_MASK 0x03FF
#define GLAMO_LCD_HEIGHT_MASK 0x03FF
#define GLAMO_LCD_PITCH_MASK 0x07FE
#define GLAMO_LCD_HV_TOTAL_MASK 0x03FF
#define GLAMO_LCD_HV_RETR_START_MASK 0x03FF
#define GLAMO_LCD_HV_RETR_END_MASK 0x03FF
#define GLAMO_LCD_HV_RETR_DISP_START_MASK 0x03FF
#define GLAMO_LCD_HV_RETR_DISP_END_MASK 0x03FF

/* the caller has to enxure lock_cmd is held and we are in cmd mode */
static void __rotate_lcd(struct glamofb_handle *glamo, __u32 rotation)
{
	int glamo_rot;

	if (glamo->core->suspending) {
		dev_err(&glamo->core->pdev->dev,
				"IGNORING rotate_lcd while "
								 "suspended\n");
		return;
	}

	switch (rotation) {
	case FB_ROTATE_CW:
		glamo_rot = GLAMO_LCD_ROT_MODE_90;
		break;
	case FB_ROTATE_UD:
		glamo_rot = GLAMO_LCD_ROT_MODE_180;
		break;
	case FB_ROTATE_CCW:
		glamo_rot = GLAMO_LCD_ROT_MODE_270;
		break;
	default:
		glamo_rot = GLAMO_LCD_ROT_MODE_0;
		break;
	}

	reg_set_bit_mask(glamo,
			 GLAMO_REG_LCD_WIDTH,
			 GLAMO_LCD_ROT_MODE_MASK,
			 glamo_rot);
	reg_set_bit_mask(glamo,
			 GLAMO_REG_LCD_MODE1,
			 GLAMO_LCD_MODE1_ROTATE_EN,
			 (glamo_rot != GLAMO_LCD_ROT_MODE_0) ?
				 GLAMO_LCD_MODE1_ROTATE_EN : 0);
}

static void glamofb_program_mode(struct glamofb_handle* gfb) {
	int sync, bp, disp, fp, total;
	unsigned long flags;
	struct glamo_core *gcore = gfb->core;
	struct fb_var_screeninfo *var = &gfb->fb->var;

	dev_dbg(&gcore->pdev->dev,
			  "glamofb_program_mode spin_lock_irqsave\n");
	spin_lock_irqsave(&gfb->lock_cmd, flags);

	if (glamofb_cmd_mode(gfb, 1))
		goto out_unlock;

	if (var->pixclock)
		glamo_engine_reclock(gcore,
				     GLAMO_ENGINE_LCD,
				     (1000000000UL / gfb->fb->var.pixclock) * 1000);

	reg_set_bit_mask(gfb,
			 GLAMO_REG_LCD_WIDTH,
			 GLAMO_LCD_WIDTH_MASK,
			 var->xres);
	reg_set_bit_mask(gfb,
			 GLAMO_REG_LCD_HEIGHT,
			 GLAMO_LCD_HEIGHT_MASK,
			 var->yres);
	reg_set_bit_mask(gfb,
			 GLAMO_REG_LCD_PITCH,
			 GLAMO_LCD_PITCH_MASK,
			 gfb->fb->fix.line_length);

	/* honour the rotation request */
	__rotate_lcd(gfb, var->rotate);

	/* update scannout timings */
	sync = 0;
	bp = sync + var->hsync_len;
	disp = bp + var->left_margin;
	fp = disp + var->xres;
	total = fp + var->right_margin;

	reg_set_bit_mask(gfb, GLAMO_REG_LCD_HORIZ_TOTAL,
			 GLAMO_LCD_HV_TOTAL_MASK, total);
	reg_set_bit_mask(gfb, GLAMO_REG_LCD_HORIZ_RETR_START,
			 GLAMO_LCD_HV_RETR_START_MASK, sync);
	reg_set_bit_mask(gfb, GLAMO_REG_LCD_HORIZ_RETR_END,
			 GLAMO_LCD_HV_RETR_END_MASK, bp);
	reg_set_bit_mask(gfb, GLAMO_REG_LCD_HORIZ_DISP_START,
			  GLAMO_LCD_HV_RETR_DISP_START_MASK, disp);
	reg_set_bit_mask(gfb, GLAMO_REG_LCD_HORIZ_DISP_END,
			 GLAMO_LCD_HV_RETR_DISP_END_MASK, fp);

	sync = 0;
	bp = sync + var->vsync_len;
	disp = bp + var->upper_margin;
	fp = disp + var->yres;
	total = fp + var->lower_margin;

	reg_set_bit_mask(gfb, GLAMO_REG_LCD_VERT_TOTAL,
			 GLAMO_LCD_HV_TOTAL_MASK, total);
	reg_set_bit_mask(gfb, GLAMO_REG_LCD_VERT_RETR_START,
			  GLAMO_LCD_HV_RETR_START_MASK, sync);
	reg_set_bit_mask(gfb, GLAMO_REG_LCD_VERT_RETR_END,
			 GLAMO_LCD_HV_RETR_END_MASK, bp);
	reg_set_bit_mask(gfb, GLAMO_REG_LCD_VERT_DISP_START,
			 GLAMO_LCD_HV_RETR_DISP_START_MASK, disp);
	reg_set_bit_mask(gfb, GLAMO_REG_LCD_VERT_DISP_END,
			 GLAMO_LCD_HV_RETR_DISP_END_MASK, fp);

	glamofb_cmd_mode(gfb, 0);

	gfb->mode_set = 1;

out_unlock:
	dev_dbg(&gcore->pdev->dev,
		      "glamofb_program_mode spin_unlock_irqrestore\n");
	spin_unlock_irqrestore(&gfb->lock_cmd, flags);
}


static int glamofb_pan_display(struct fb_var_screeninfo *var,
		struct fb_info *info)
{
	return 0;
}

static struct fb_videomode *glamofb_find_mode(struct fb_info *info,
        struct fb_var_screeninfo *var) {
	struct glamofb_handle *glamo = info->par;
	struct glamo_fb_platform_data *mach_info = glamo->mach_info;
	struct fb_videomode *mode;
	int i;

	for(i = mach_info->num_modes, mode = mach_info->modes; i > 0; --i, ++mode) {
		if (mode->xres == var->xres &&
		    mode->yres == var->yres)
			return mode;
	}

	return NULL;
}

static int glamofb_set_par(struct fb_info *info)
{
	struct glamofb_handle *glamo = info->par;
	struct fb_var_screeninfo *var = &info->var;
	struct fb_videomode *mode;

	if (glamo->core->suspending) {
		dev_err(&glamo->core->pdev->dev,
				"IGNORING glamofb_set_par while "
								 "suspended\n");
		return -EBUSY;
	}

	mode = glamofb_find_mode(info, var);
	if (!mode)
		return -EINVAL;

	fb_videomode_to_var(var, mode);

	info->mode = mode;

	glamo->mode_set = 0;

	switch(var->rotate) {
	case FB_ROTATE_CW:
	case FB_ROTATE_CCW:
		info->fix.line_length = (var->yres * var->bits_per_pixel) / 8;
		/* FIXME: Limit pixelclock */
		var->pixclock *= 2;
		break;
	default:
		info->fix.line_length = (var->xres * var->bits_per_pixel) / 8;
		break;
	}

	if(glamo->output_enabled)
		glamofb_program_mode(glamo);

	return 0;
}

static int glamofb_blank(int blank_mode, struct fb_info *info)
{
	struct glamofb_handle *gfb = info->par;

	dev_dbg(gfb->dev, "glamofb_blank(%u)\n", blank_mode);

	switch (blank_mode) {
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
		/* FIXME: add pdata hook/flag to indicate whether
		 * we should already switch off pixel clock here */
		break;
	case FB_BLANK_POWERDOWN:
		/* disable the pixel clock */
		glamo_output_disable(gfb);
		gfb->blank_mode = blank_mode;
		break;
	case FB_BLANK_UNBLANK:
	case FB_BLANK_NORMAL:
		glamo_output_enable(gfb);
		gfb->blank_mode = blank_mode;
		break;
	}

	/* FIXME: once we have proper clock management in glamo-core,
	 * we can determine if other units need MCLK1 or the PLL, and
	 * disable it if not used. */
	return 0;
}

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

static int glamofb_setcolreg(unsigned regno,
			     unsigned red, unsigned green, unsigned blue,
			     unsigned transp, struct fb_info *info)
{
	struct glamofb_handle *glamo = info->par;
	unsigned int val;

	if (glamo->core->suspending) {
		dev_err(&glamo->core->pdev->dev,
				"IGNORING glamofb_set_par while "
								 "suspended\n");
		return -EBUSY;
	}

	switch (glamo->fb->fix.visual) {
	case FB_VISUAL_TRUECOLOR:
	case FB_VISUAL_DIRECTCOLOR:
		/* true-colour, use pseuo-palette */

		if (regno < 16) {
			u32 *pal = glamo->fb->pseudo_palette;

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

			pal[regno] = val;
		};
		break;
	default:
		return 1; /* unknown type */
	}

	return 0;
}

static int glamofb_ioctl(struct fb_info *info, unsigned int cmd,
                         unsigned long arg) {
	struct glamofb_handle *gfb = (struct glamofb_handle*)info->par;
	struct glamo_core *gcore = gfb->core;
	int retval = -ENOTTY;

	switch (cmd) {
	case GLAMOFB_ENGINE_ENABLE:
		retval = glamo_engine_enable(gcore, arg);
		break;
	case GLAMOFB_ENGINE_DISABLE:
		retval = glamo_engine_disable(gcore, arg);
		break;
	case GLAMOFB_ENGINE_RESET:
		glamo_engine_reset(gcore, arg);
		retval = 0;
		break;
	default:
		break;
	}

	return retval;
}


#ifdef CONFIG_MFD_GLAMO_HWACCEL
static inline void glamofb_vsync_wait(struct glamofb_handle *glamo,
		int line, int size, int range)
{
	int count[2];

	do {
		count[0] = reg_read(glamo, GLAMO_REG_LCD_STATUS2) & 0x3ff;
		count[1] = reg_read(glamo, GLAMO_REG_LCD_STATUS2) & 0x3ff;
	} while (count[0] != count[1] ||
			(line < count[0] + range &&
			 size > count[0] - range) ||
			count[0] < range * 2);
}

/*
 * Enable/disable the hardware cursor mode altogether
 * (for blinking and such, use glamofb_cursor()).
 */
static void glamofb_cursor_onoff(struct glamofb_handle *glamo, int on)
{
	int y, size;

	if (glamo->cursor_on) {
		y = reg_read(glamo, GLAMO_REG_LCD_CURSOR_Y_POS);
		size = reg_read(glamo, GLAMO_REG_LCD_CURSOR_Y_SIZE);

		glamofb_vsync_wait(glamo, y, size, 30);
	}

	reg_set_bit_mask(glamo, GLAMO_REG_LCD_MODE1,
			GLAMO_LCD_MODE1_CURSOR_EN,
			on ? GLAMO_LCD_MODE1_CURSOR_EN : 0);
	glamo->cursor_on = on;

	/* Hide the cursor by default */
	reg_write(glamo, GLAMO_REG_LCD_CURSOR_X_SIZE, 0);
}

static int glamofb_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
	struct glamofb_handle *glamo = info->par;
	unsigned long flags;

	spin_lock_irqsave(&glamo->lock_cmd, flags);

	reg_write(glamo, GLAMO_REG_LCD_CURSOR_X_SIZE,
			cursor->enable ? cursor->image.width : 0);

	if (cursor->set & FB_CUR_SETPOS) {
		reg_write(glamo, GLAMO_REG_LCD_CURSOR_X_POS,
			  cursor->image.dx);
		reg_write(glamo, GLAMO_REG_LCD_CURSOR_Y_POS,
			  cursor->image.dy);
	}

	if (cursor->set & FB_CUR_SETCMAP) {
		uint16_t fg = glamo->pseudo_pal[cursor->image.fg_color];
		uint16_t bg = glamo->pseudo_pal[cursor->image.bg_color];

		reg_write(glamo, GLAMO_REG_LCD_CURSOR_FG_COLOR, fg);
		reg_write(glamo, GLAMO_REG_LCD_CURSOR_BG_COLOR, bg);
		reg_write(glamo, GLAMO_REG_LCD_CURSOR_DST_COLOR, fg);
	}

	if (cursor->set & FB_CUR_SETHOT)
		reg_write(glamo, GLAMO_REG_LCD_CURSOR_PRESET,
				(cursor->hot.x << 8) | cursor->hot.y);

	if ((cursor->set & FB_CUR_SETSIZE) ||
	    (cursor->set & (FB_CUR_SETIMAGE | FB_CUR_SETSHAPE))) {
		int x, y, pitch, op;
		const uint8_t *pcol = cursor->image.data;
		const uint8_t *pmsk = cursor->mask;
		uint8_t __iomem *dst = glamo->cursor_addr;
		uint8_t dcol = 0;
		uint8_t dmsk = 0;
		uint8_t byte = 0;

		if (cursor->image.depth > 1) {
			spin_unlock_irqrestore(&glamo->lock_cmd, flags);
			return -EINVAL;
		}

		pitch = ((cursor->image.width + 7) >> 2) & ~1;
		reg_write(glamo, GLAMO_REG_LCD_CURSOR_PITCH,
			pitch);
		reg_write(glamo, GLAMO_REG_LCD_CURSOR_Y_SIZE,
			cursor->image.height);

		for (y = 0; y < cursor->image.height; y++) {
			byte = 0;
			for (x = 0; x < cursor->image.width; x++) {
				if ((x % 8) == 0) {
					dcol = *pcol++;
					dmsk = *pmsk++;
				} else {
					dcol >>= 1;
					dmsk >>= 1;
				}

				if (cursor->rop == ROP_COPY)
					op = (dmsk & 1) ?
						(dcol & 1) ? 1 : 3 : 0;
				else
					op = ((dmsk & 1) << 1) |
						((dcol & 1) << 0);
				byte |= op << ((x & 3) << 1);

				if (x % 4 == 3) {
					writeb(byte, dst + x / 4);
					byte = 0;
				}
			}
			if (x % 4) {
				writeb(byte, dst + x / 4);
				byte = 0;
			}

			dst += pitch;
		}
	}

	spin_unlock_irqrestore(&glamo->lock_cmd, flags);

	return 0;
}
#endif

static inline int glamofb_cmdq_empty(struct glamofb_handle *gfb)
{
	/* DGCMdQempty -- 1 == command queue is empty */
	return reg_read(gfb, GLAMO_REG_LCD_STATUS1) & (1 << 15);
}

/* call holding gfb->lock_cmd  when locking, until you unlock */
int glamofb_cmd_mode(struct glamofb_handle *gfb, int on)
{
	int timeout = 2000000;

	if (gfb->core->suspending) {
		dev_err(&gfb->core->pdev->dev,
				"IGNORING glamofb_cmd_mode while "
								 "suspended\n");
		return -EBUSY;
	}

	dev_dbg(gfb->dev, "glamofb_cmd_mode(gfb=%p, on=%d)\n", gfb, on);
	if (on) {
		dev_dbg(gfb->dev, "%s: waiting for cmdq empty: ",
			__func__);
		while ((!glamofb_cmdq_empty(gfb)) && (timeout--))
			cpu_relax();
		if (timeout < 0) {
			printk(KERN_ERR"*************"
				       "glamofb cmd_queue never got empty"
				       "*************\n");
			return -EIO;
		}
		dev_dbg(gfb->dev, "empty!\n");

		/* display the entire frame then switch to command */
		reg_write(gfb, GLAMO_REG_LCD_COMMAND1,
			  GLAMO_LCD_CMD_TYPE_DISP |
			  GLAMO_LCD_CMD_DATA_FIRE_VSYNC);

		/* wait until lcd idle */
		dev_dbg(gfb->dev, "waiting for lcd idle: ");
		timeout = 2000000;
		while ((!reg_read(gfb, GLAMO_REG_LCD_STATUS2) & (1 << 12)) &&
		      (timeout--))
			cpu_relax();
		if (timeout < 0) {
			printk(KERN_ERR"*************"
				       "glamofb lcd never idle"
				       "*************\n");
			return -EIO;
		}

		mdelay(100);

		dev_dbg(gfb->dev, "cmd mode entered\n");

	} else {
		/* RGB interface needs vsync/hsync */
		if (reg_read(gfb, GLAMO_REG_LCD_MODE3) & GLAMO_LCD_MODE3_RGB)
			reg_write(gfb, GLAMO_REG_LCD_COMMAND1,
				  GLAMO_LCD_CMD_TYPE_DISP |
				  GLAMO_LCD_CMD_DATA_DISP_SYNC);

		reg_write(gfb, GLAMO_REG_LCD_COMMAND1,
			  GLAMO_LCD_CMD_TYPE_DISP |
			  GLAMO_LCD_CMD_DATA_DISP_FIRE);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(glamofb_cmd_mode);


int glamofb_cmd_write(struct glamofb_handle *gfb, u_int16_t val)
{
	int timeout = 200000;

	if (gfb->core->suspending) {
		dev_err(&gfb->core->pdev->dev,
				"IGNORING glamofb_cmd_write while "
								 "suspended\n");
		return -EBUSY;
	}

	dev_dbg(gfb->dev, "%s: waiting for cmdq empty\n", __func__);
	while ((!glamofb_cmdq_empty(gfb)) && (timeout--))
		yield();
	if (timeout < 0) {
		printk(KERN_ERR"*************"
				"glamofb cmd_queue never got empty"
				"*************\n");
		return 1;
	}
	dev_dbg(gfb->dev, "idle, writing 0x%04x\n", val);

	reg_write(gfb, GLAMO_REG_LCD_COMMAND1, val);

	return 0;
}
EXPORT_SYMBOL_GPL(glamofb_cmd_write);

static struct fb_ops glamofb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= glamofb_check_var,
	.fb_pan_display	= glamofb_pan_display,
	.fb_set_par	= glamofb_set_par,
	.fb_blank	= glamofb_blank,
	.fb_setcolreg	= glamofb_setcolreg,
	.fb_ioctl = glamofb_ioctl,
#ifdef CONFIG_MFD_GLAMO_HWACCEL
	.fb_cursor	= glamofb_cursor,
#endif
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

static int glamofb_init_regs(struct glamofb_handle *glamo)
{
	struct fb_info *info = glamo->fb;

	glamofb_check_var(&info->var, info);
	glamofb_run_script(glamo, glamo_regs, ARRAY_SIZE(glamo_regs));
	glamofb_set_par(info);

	return 0;
}

static int __init glamofb_probe(struct platform_device *pdev)
{
	int rc = -EIO;
	struct fb_info *fbinfo;
	struct glamofb_handle *glamofb;
	struct glamo_core *core = dev_get_drvdata(pdev->dev.parent);
	struct glamo_fb_platform_data *mach_info;

	printk(KERN_INFO "SMEDIA Glamo frame buffer driver (C) 2007 "
		"Openmoko, Inc.\n");

	if (!core->pdata || !core->pdata->fb_data)
		return -ENOENT;


	fbinfo = framebuffer_alloc(sizeof(struct glamofb_handle), &pdev->dev);
	if (!fbinfo)
		return -ENOMEM;


	glamofb = fbinfo->par;
	glamofb->fb = fbinfo;
	glamofb->dev = &pdev->dev;

	glamofb->blank_mode = FB_BLANK_POWERDOWN;

	strcpy(fbinfo->fix.id, "SMedia Glamo");

	glamofb->reg = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						    "glamo-fb-regs");
	if (!glamofb->reg) {
		dev_err(&pdev->dev, "platform device with no registers?\n");
		rc = -ENOENT;
		goto out_free;
	}

	glamofb->fb_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
							"glamo-fb-mem");
	if (!glamofb->fb_res) {
		dev_err(&pdev->dev, "platform device with no memory ?\n");
		rc = -ENOENT;
		goto out_free;
	}

	glamofb->reg = request_mem_region(glamofb->reg->start,
					  resource_size(glamofb->reg), pdev->name);
	if (!glamofb->reg) {
		dev_err(&pdev->dev, "failed to request mmio region\n");
		goto out_free;
	}

	glamofb->fb_res = request_mem_region(glamofb->fb_res->start,
					     resource_size(glamofb->fb_res),
					     pdev->name);
	if (!glamofb->fb_res) {
		dev_err(&pdev->dev, "failed to request vram region\n");
		goto out_release_reg;
	}

	/* we want to remap only the registers required for this core
	 * driver. */
	glamofb->base = ioremap_nocache(glamofb->reg->start, resource_size(glamofb->reg));
	if (!glamofb->base) {
		dev_err(&pdev->dev, "failed to ioremap() mmio memory\n");
		goto out_release_fb;
	}

	fbinfo->fix.smem_start = (unsigned long) glamofb->fb_res->start;
	fbinfo->fix.smem_len = (__u32) resource_size(glamofb->fb_res);

	fbinfo->screen_base = ioremap(glamofb->fb_res->start,
				       resource_size(glamofb->fb_res));
	if (!fbinfo->screen_base) {
		dev_err(&pdev->dev, "failed to ioremap() vram memory\n");
		goto out_release_fb;
	}
	glamofb->cursor_addr = fbinfo->screen_base + 0x12C000;

	platform_set_drvdata(pdev, glamofb);

	mach_info = core->pdata->fb_data;
	glamofb->core = core;
	glamofb->mach_info = mach_info;

	fbinfo->fix.visual = FB_VISUAL_TRUECOLOR;
	fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
	fbinfo->fix.type_aux = 0;
	fbinfo->fix.xpanstep = 0;
	fbinfo->fix.ypanstep = 0;
	fbinfo->fix.ywrapstep = 0;
	fbinfo->fix.accel = FB_ACCEL_GLAMO;


	fbinfo->fbops = &glamofb_ops;
	fbinfo->flags = FBINFO_FLAG_DEFAULT;
	fbinfo->pseudo_palette = &glamofb->pseudo_pal;

	fbinfo->mode = mach_info->modes;
	fb_videomode_to_var(&fbinfo->var, fbinfo->mode);
	fbinfo->var.bits_per_pixel = 16;
	fbinfo->var.nonstd = 0;
	fbinfo->var.activate = FB_ACTIVATE_NOW;
	fbinfo->var.height = mach_info->height;
	fbinfo->var.width = mach_info->width;
	fbinfo->var.accel_flags = 0;
	fbinfo->var.vmode = FB_VMODE_NONINTERLACED;

	glamo_engine_enable(core, GLAMO_ENGINE_LCD);
	glamo_engine_reset(core, GLAMO_ENGINE_LCD);
	glamofb->output_enabled = 1;
	glamofb->mode_set = 1;

	dev_info(&pdev->dev, "spin_lock_init\n");
	spin_lock_init(&glamofb->lock_cmd);
	glamofb_init_regs(glamofb);
#ifdef CONFIG_MFD_GLAMO_HWACCEL
	glamofb_cursor_onoff(glamofb, 1);
#endif

	fb_videomode_to_modelist(mach_info->modes, mach_info->num_modes,
	                         &fbinfo->modelist);

	rc = register_framebuffer(fbinfo);
	if (rc < 0) {
		dev_err(&pdev->dev, "failed to register framebuffer\n");
		goto out_unmap_fb;
	}

	printk(KERN_INFO "fb%d: %s frame buffer device\n",
		fbinfo->node, fbinfo->fix.id);

	return 0;

out_unmap_fb:
	iounmap(fbinfo->screen_base);
	iounmap(glamofb->base);
out_release_fb:
	release_mem_region(glamofb->fb_res->start, resource_size(glamofb->fb_res));
out_release_reg:
	release_mem_region(glamofb->reg->start, resource_size(glamofb->reg));
out_free:
	framebuffer_release(fbinfo);
	return rc;
}

static int glamofb_remove(struct platform_device *pdev)
{
	struct glamofb_handle *glamofb = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);
	iounmap(glamofb->base);
	release_mem_region(glamofb->reg->start, resource_size(glamofb->reg));
	kfree(glamofb);

	return 0;
}

#ifdef CONFIG_PM

static int glamofb_suspend(struct device *dev)
{
	struct glamofb_handle *gfb = dev_get_drvdata(dev);

	/* we need to stop anything touching our framebuffer */
	fb_set_suspend(gfb->fb, 1);

	/* seriously -- nobody is allowed to touch glamo memory when we
	 * are suspended or we lock on nWAIT
	 */
	/* iounmap(gfb->fb->screen_base); */

	return 0;
}

static int glamofb_resume(struct device *dev)
{
	struct glamofb_handle *gfb = dev_get_drvdata(dev);

	/* OK let's allow framebuffer ops again */
	/* gfb->fb->screen_base = ioremap(gfb->fb_res->start,
				       resource_size(gfb->fb_res)); */
	glamo_engine_enable(gfb->core, GLAMO_ENGINE_LCD);
	glamo_engine_reset(gfb->core, GLAMO_ENGINE_LCD);

	glamofb_init_regs(gfb);
#ifdef CONFIG_MFD_GLAMO_HWACCEL
	glamofb_cursor_onoff(gfb, 1);
#endif

	fb_set_suspend(gfb->fb, 0);

	return 0;
}

static struct dev_pm_ops glamofb_pm_ops = {
	.suspend = glamofb_suspend,
	.resume = glamofb_resume,
};

#define GLAMOFB_PM_OPS (&glamofb_pm_ops)

#else
#define GLAMOFB_PM_OPS NULL
#endif

static struct platform_driver glamofb_driver = {
	.probe		= glamofb_probe,
	.remove		= glamofb_remove,
	.driver		= {
		.name	= "glamo-fb",
		.owner	= THIS_MODULE,
		.pm     = GLAMOFB_PM_OPS
	},
};

static int __devinit glamofb_init(void)
{
	return platform_driver_register(&glamofb_driver);
}

static void __exit glamofb_cleanup(void)
{
	platform_driver_unregister(&glamofb_driver);
}

module_init(glamofb_init);
module_exit(glamofb_cleanup);

MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
MODULE_DESCRIPTION("Smedia Glamo 336x/337x framebuffer driver");
MODULE_LICENSE("GPL");