aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/bfin_adv7393fb.c
blob: a54f7f7d763b0ae52f21530ce50ee829bd9fc2cb (plain) (blame)
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
/*
 * Frame buffer driver for ADV7393/2 video encoder
 *
 * Copyright 2006-2009 Analog Devices Inc.
 * Licensed under the GPL-2 or late.
 */

/*
 * TODO: Remove Globals
 * TODO: Code Cleanup
 */

#define pr_fmt(fmt) DRIVER_NAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <asm/blackfin.h>
#include <asm/irq.h>
#include <asm/dma.h>
#include <linux/uaccess.h>
#include <linux/gpio.h>
#include <asm/portmux.h>

#include <linux/dma-mapping.h>
#include <linux/proc_fs.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>

#include "bfin_adv7393fb.h"

static int mode = VMODE;
static int mem = VMEM;
static int nocursor = 1;

static const unsigned short ppi_pins[] = {
	P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2,
	P_PPI0_D0, P_PPI0_D1, P_PPI0_D2, P_PPI0_D3,
	P_PPI0_D4, P_PPI0_D5, P_PPI0_D6, P_PPI0_D7,
	P_PPI0_D8, P_PPI0_D9, P_PPI0_D10, P_PPI0_D11,
	P_PPI0_D12, P_PPI0_D13, P_PPI0_D14, P_PPI0_D15,
	0
};

/*
 * card parameters
 */

static struct bfin_adv7393_fb_par {
	/* structure holding blackfin / adv7393 parameters when
	   screen is blanked */
	struct {
		u8 Mode;	/* ntsc/pal/? */
	} vga_state;
	atomic_t ref_count;
} bfin_par;

/* --------------------------------------------------------------------- */

static struct fb_var_screeninfo bfin_adv7393_fb_defined = {
	.xres = 720,
	.yres = 480,
	.xres_virtual = 720,
	.yres_virtual = 480,
	.bits_per_pixel = 16,
	.activate = FB_ACTIVATE_TEST,
	.height = -1,
	.width = -1,
	.left_margin = 0,
	.right_margin = 0,
	.upper_margin = 0,
	.lower_margin = 0,
	.vmode = FB_VMODE_INTERLACED,
	.red = {11, 5, 0},
	.green = {5, 6, 0},
	.blue = {0, 5, 0},
	.transp = {0, 0, 0},
};

static struct fb_fix_screeninfo bfin_adv7393_fb_fix = {
	.id = "BFIN ADV7393",
	.smem_len = 720 * 480 * 2,
	.type = FB_TYPE_PACKED_PIXELS,
	.visual = FB_VISUAL_TRUECOLOR,
	.xpanstep = 0,
	.ypanstep = 0,
	.line_length = 720 * 2,
	.accel = FB_ACCEL_NONE
};

static struct fb_ops bfin_adv7393_fb_ops = {
	.owner = THIS_MODULE,
	.fb_open = bfin_adv7393_fb_open,
	.fb_release = bfin_adv7393_fb_release,
	.fb_check_var = bfin_adv7393_fb_check_var,
	.fb_pan_display = bfin_adv7393_fb_pan_display,
	.fb_blank = bfin_adv7393_fb_blank,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
	.fb_cursor = bfin_adv7393_fb_cursor,
	.fb_setcolreg = bfin_adv7393_fb_setcolreg,
};

static int dma_desc_list(struct adv7393fb_device *fbdev, u16 arg)
{
	if (arg == BUILD) {	/* Build */
		fbdev->vb1 = l1_data_sram_zalloc(sizeof(struct dmasg));
		if (fbdev->vb1 == NULL)
			goto error;

		fbdev->av1 = l1_data_sram_zalloc(sizeof(struct dmasg));
		if (fbdev->av1 == NULL)
			goto error;

		fbdev->vb2 = l1_data_sram_zalloc(sizeof(struct dmasg));
		if (fbdev->vb2 == NULL)
			goto error;

		fbdev->av2 = l1_data_sram_zalloc(sizeof(struct dmasg));
		if (fbdev->av2 == NULL)
			goto error;

		/* Build linked DMA descriptor list */
		fbdev->vb1->next_desc_addr = fbdev->av1;
		fbdev->av1->next_desc_addr = fbdev->vb2;
		fbdev->vb2->next_desc_addr = fbdev->av2;
		fbdev->av2->next_desc_addr = fbdev->vb1;

		/* Save list head */
		fbdev->descriptor_list_head = fbdev->av2;

		/* Vertical Blanking Field 1 */
		fbdev->vb1->start_addr = VB_DUMMY_MEMORY_SOURCE;
		fbdev->vb1->cfg = DMA_CFG_VAL;

		fbdev->vb1->x_count =
		    fbdev->modes[mode].xres + fbdev->modes[mode].boeft_blank;

		fbdev->vb1->x_modify = 0;
		fbdev->vb1->y_count = fbdev->modes[mode].vb1_lines;
		fbdev->vb1->y_modify = 0;

		/* Active Video Field 1 */

		fbdev->av1->start_addr = (unsigned long)fbdev->fb_mem;
		fbdev->av1->cfg = DMA_CFG_VAL;
		fbdev->av1->x_count =
		    fbdev->modes[mode].xres + fbdev->modes[mode].boeft_blank;
		fbdev->av1->x_modify = fbdev->modes[mode].bpp / 8;
		fbdev->av1->y_count = fbdev->modes[mode].a_lines;
		fbdev->av1->y_modify =
		    (fbdev->modes[mode].xres - fbdev->modes[mode].boeft_blank +
		     1) * (fbdev->modes[mode].bpp / 8);

		/* Vertical Blanking Field 2 */

		fbdev->vb2->start_addr = VB_DUMMY_MEMORY_SOURCE;
		fbdev->vb2->cfg = DMA_CFG_VAL;
		fbdev->vb2->x_count =
		    fbdev->modes[mode].xres + fbdev->modes[mode].boeft_blank;

		fbdev->vb2->x_modify = 0;
		fbdev->vb2->y_count = fbdev->modes[mode].vb2_lines;
		fbdev->vb2->y_modify = 0;

		/* Active Video Field 2 */

		fbdev->av2->start_addr =
		    (unsigned long)fbdev->fb_mem + fbdev->line_len;

		fbdev->av2->cfg = DMA_CFG_VAL;

		fbdev->av2->x_count =
		    fbdev->modes[mode].xres + fbdev->modes[mode].boeft_blank;

		fbdev->av2->x_modify = (fbdev->modes[mode].bpp / 8);
		fbdev->av2->y_count = fbdev->modes[mode].a_lines;

		fbdev->av2->y_modify =
		    (fbdev->modes[mode].xres - fbdev->modes[mode].boeft_blank +
		     1) * (fbdev->modes[mode].bpp / 8);

		return 1;
	}

error:
	l1_data_sram_free(fbdev->vb1);
	l1_data_sram_free(fbdev->av1);
	l1_data_sram_free(fbdev->vb2);
	l1_data_sram_free(fbdev->av2);

	return 0;
}

static int bfin_config_dma(struct adv7393fb_device *fbdev)
{
	BUG_ON(!(fbdev->fb_mem));

	set_dma_x_count(CH_PPI, fbdev->descriptor_list_head->x_count);
	set_dma_x_modify(CH_PPI, fbdev->descriptor_list_head->x_modify);
	set_dma_y_count(CH_PPI, fbdev->descriptor_list_head->y_count);
	set_dma_y_modify(CH_PPI, fbdev->descriptor_list_head->y_modify);
	set_dma_start_addr(CH_PPI, fbdev->descriptor_list_head->start_addr);
	set_dma_next_desc_addr(CH_PPI,
			       fbdev->descriptor_list_head->next_desc_addr);
	set_dma_config(CH_PPI, fbdev->descriptor_list_head->cfg);

	return 1;
}

static void bfin_disable_dma(void)
{
	bfin_write_DMA0_CONFIG(bfin_read_DMA0_CONFIG() & ~DMAEN);
}

static void bfin_config_ppi(struct adv7393fb_device *fbdev)
{
	if (ANOMALY_05000183) {
		bfin_write_TIMER2_CONFIG(WDTH_CAP);
		bfin_write_TIMER_ENABLE(TIMEN2);
	}

	bfin_write_PPI_CONTROL(0x381E);
	bfin_write_PPI_FRAME(fbdev->modes[mode].tot_lines);
	bfin_write_PPI_COUNT(fbdev->modes[mode].xres +
			     fbdev->modes[mode].boeft_blank - 1);
	bfin_write_PPI_DELAY(fbdev->modes[mode].aoeft_blank - 1);
}

static void bfin_enable_ppi(void)
{
	bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() | PORT_EN);
}

static void bfin_disable_ppi(void)
{
	bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() & ~PORT_EN);
}

static inline int adv7393_write(struct i2c_client *client, u8 reg, u8 value)
{
	return i2c_smbus_write_byte_data(client, reg, value);
}

static inline int adv7393_read(struct i2c_client *client, u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

static int
adv7393_write_block(struct i2c_client *client,
		    const u8 *data, unsigned int len)
{
	int ret = -1;
	u8 reg;

	while (len >= 2) {
		reg = *data++;
		ret = adv7393_write(client, reg, *data++);
		if (ret < 0)
			break;
		len -= 2;
	}

	return ret;
}

static int adv7393_mode(struct i2c_client *client, u16 mode)
{
	switch (mode) {
	case POWER_ON:		/* ADV7393 Sleep mode OFF */
		adv7393_write(client, 0x00, 0x1E);
		break;
	case POWER_DOWN:	/* ADV7393 Sleep mode ON */
		adv7393_write(client, 0x00, 0x1F);
		break;
	case BLANK_OFF:		/* Pixel Data Valid */
		adv7393_write(client, 0x82, 0xCB);
		break;
	case BLANK_ON:		/* Pixel Data Invalid */
		adv7393_write(client, 0x82, 0x8B);
		break;
	default:
		return -EINVAL;
		break;
	}
	return 0;
}

static irqreturn_t ppi_irq_error(int irq, void *dev_id)
{

	struct adv7393fb_device *fbdev = (struct adv7393fb_device *)dev_id;

	u16 status = bfin_read_PPI_STATUS();

	pr_debug("%s: PPI Status = 0x%X\n", __func__, status);

	if (status) {
		bfin_disable_dma();	/* TODO: Check Sequence */
		bfin_disable_ppi();
		bfin_clear_PPI_STATUS();
		bfin_config_dma(fbdev);
		bfin_enable_ppi();
	}

	return IRQ_HANDLED;

}

static int proc_output(char *buf)
{
	char *p = buf;

	p += sprintf(p,
		"Usage:\n"
		"echo 0x[REG][Value] > adv7393\n"
		"example: echo 0x1234 >adv7393\n"
		"writes 0x34 into Register 0x12\n");

	return p - buf;
}

static ssize_t
adv7393_read_proc(struct file *file, char __user *buf,
		  size_t size, loff_t *ppos)
{
	static const char message[] = "Usage:\n"
		"echo 0x[REG][Value] > adv7393\n"
		"example: echo 0x1234 >adv7393\n"
		"writes 0x34 into Register 0x12\n";
	return simple_read_from_buffer(buf, size, ppos, message,
					sizeof(message));
}

static ssize_t
adv7393_write_proc(struct file *file, const char __user * buffer,
		   size_t count, loff_t *ppos)
{
	struct adv7393fb_device *fbdev = PDE_DATA(file_inode(file));
	unsigned int val;
	int ret;

	ret = kstrtouint_from_user(buffer, count, 0, &val);
	if (ret)
		return -EFAULT;

	adv7393_write(fbdev->client, val >> 8, val & 0xff);

	return count;
}

static const struct file_operations fops = {
	.read = adv7393_read_proc,
	.write = adv7393_write_proc,
	.llseek = default_llseek,
};

static int bfin_adv7393_fb_probe(struct i2c_client *client,
				 const struct i2c_device_id *id)
{
	int ret = 0;
	struct proc_dir_entry *entry;
	int num_modes = ARRAY_SIZE(known_modes);

	struct adv7393fb_device *fbdev = NULL;

	if (mem > 2) {
		dev_err(&client->dev, "mem out of allowed range [1;2]\n");
		return -EINVAL;
	}

	if (mode > num_modes) {
		dev_err(&client->dev, "mode %d: not supported", mode);
		return -EFAULT;
	}

	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
	if (!fbdev) {
		dev_err(&client->dev, "failed to allocate device private record");
		return -ENOMEM;
	}

	i2c_set_clientdata(client, fbdev);

	fbdev->modes = known_modes;
	fbdev->client = client;

	fbdev->fb_len =
	    mem * fbdev->modes[mode].xres * fbdev->modes[mode].xres *
	    (fbdev->modes[mode].bpp / 8);

	fbdev->line_len =
	    fbdev->modes[mode].xres * (fbdev->modes[mode].bpp / 8);

	/* Workaround "PPI Does Not Start Properly In Specific Mode" */
	if (ANOMALY_05000400) {
		ret = gpio_request_one(P_IDENT(P_PPI0_FS3), GPIOF_OUT_INIT_LOW,
					"PPI0_FS3")
		if (ret) {
			dev_err(&client->dev, "PPI0_FS3 GPIO request failed\n");
			ret = -EBUSY;
			goto free_fbdev;
		}
	}

	if (peripheral_request_list(ppi_pins, DRIVER_NAME)) {
		dev_err(&client->dev, "requesting PPI peripheral failed\n");
		ret = -EFAULT;
		goto free_gpio;
	}

	fbdev->fb_mem =
	    dma_alloc_coherent(NULL, fbdev->fb_len, &fbdev->dma_handle,
			       GFP_KERNEL);

	if (NULL == fbdev->fb_mem) {
		dev_err(&client->dev, "couldn't allocate dma buffer (%d bytes)\n",
		       (u32) fbdev->fb_len);
		ret = -ENOMEM;
		goto free_ppi_pins;
	}

	fbdev->info.screen_base = (void *)fbdev->fb_mem;
	bfin_adv7393_fb_fix.smem_start = (int)fbdev->fb_mem;

	bfin_adv7393_fb_fix.smem_len = fbdev->fb_len;
	bfin_adv7393_fb_fix.line_length = fbdev->line_len;

	if (mem > 1)
		bfin_adv7393_fb_fix.ypanstep = 1;

	bfin_adv7393_fb_defined.red.length = 5;
	bfin_adv7393_fb_defined.green.length = 6;
	bfin_adv7393_fb_defined.blue.length = 5;

	bfin_adv7393_fb_defined.xres = fbdev->modes[mode].xres;
	bfin_adv7393_fb_defined.yres = fbdev->modes[mode].yres;
	bfin_adv7393_fb_defined.xres_virtual = fbdev->modes[mode].xres;
	bfin_adv7393_fb_defined.yres_virtual = mem * fbdev->modes[mode].yres;
	bfin_adv7393_fb_defined.bits_per_pixel = fbdev->modes[mode].bpp;

	fbdev->info.fbops = &bfin_adv7393_fb_ops;
	fbdev->info.var = bfin_adv7393_fb_defined;
	fbdev->info.fix = bfin_adv7393_fb_fix;
	fbdev->info.par = &bfin_par;
	fbdev->info.flags = FBINFO_DEFAULT;

	fbdev->info.pseudo_palette = kzalloc(sizeof(u32) * 16, GFP_KERNEL);
	if (!fbdev->info.pseudo_palette) {
		dev_err(&client->dev, "failed to allocate pseudo_palette\n");
		ret = -ENOMEM;
		goto free_fb_mem;
	}

	if (fb_alloc_cmap(&fbdev->info.cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
		dev_err(&client->dev, "failed to allocate colormap (%d entries)\n",
			   BFIN_LCD_NBR_PALETTE_ENTRIES);
		ret = -EFAULT;
		goto free_palette;
	}

	if (request_dma(CH_PPI, "BF5xx_PPI_DMA") < 0) {
		dev_err(&client->dev, "unable to request PPI DMA\n");
		ret = -EFAULT;
		goto free_cmap;
	}

	if (request_irq(IRQ_PPI_ERROR, ppi_irq_error, 0,
			"PPI ERROR", fbdev) < 0) {
		dev_err(&client->dev, "unable to request PPI ERROR IRQ\n");
		ret = -EFAULT;
		goto free_ch_ppi;
	}

	fbdev->open = 0;

	ret = adv7393_write_block(client, fbdev->modes[mode].adv7393_i2c_initd,
				fbdev->modes[mode].adv7393_i2c_initd_len);

	if (ret) {
		dev_err(&client->dev, "i2c attach: init error\n");
		goto free_irq_ppi;
	}


	if (register_framebuffer(&fbdev->info) < 0) {
		dev_err(&client->dev, "unable to register framebuffer\n");
		ret = -EFAULT;
		goto free_irq_ppi;
	}

	dev_info(&client->dev, "fb%d: %s frame buffer device\n",
	       fbdev->info.node, fbdev->info.fix.id);
	dev_info(&client->dev, "fb memory address : 0x%p\n", fbdev->fb_mem);

	entry = proc_create_data("driver/adv7393", 0, NULL, &fops, fbdev);
	if (!entry) {
		dev_err(&client->dev, "unable to create /proc entry\n");
		ret = -EFAULT;
		goto free_fb;
	}
	return 0;

free_fb:
	unregister_framebuffer(&fbdev->info);
free_irq_ppi:
	free_irq(IRQ_PPI_ERROR, fbdev);
free_ch_ppi:
	free_dma(CH_PPI);
free_cmap:
	fb_dealloc_cmap(&fbdev->info.cmap);
free_palette:
	kfree(fbdev->info.pseudo_palette);
free_fb_mem:
	dma_free_coherent(NULL, fbdev->fb_len, fbdev->fb_mem,
			  fbdev->dma_handle);
free_ppi_pins:
	peripheral_free_list(ppi_pins);
free_gpio:
	if (ANOMALY_05000400)
		gpio_free(P_IDENT(P_PPI0_FS3));
free_fbdev:
	kfree(fbdev);

	return ret;
}

static int bfin_adv7393_fb_open(struct fb_info *info, int user)
{
	struct adv7393fb_device *fbdev = to_adv7393fb_device(info);

	fbdev->info.screen_base = (void *)fbdev->fb_mem;
	if (!fbdev->info.screen_base) {
		dev_err(&fbdev->client->dev, "unable to map device\n");
		return -ENOMEM;
	}

	fbdev->open = 1;
	dma_desc_list(fbdev, BUILD);
	adv7393_mode(fbdev->client, BLANK_OFF);
	bfin_config_ppi(fbdev);
	bfin_config_dma(fbdev);
	bfin_enable_ppi();

	return 0;
}

static int bfin_adv7393_fb_release(struct fb_info *info, int user)
{
	struct adv7393fb_device *fbdev = to_adv7393fb_device(info);

	adv7393_mode(fbdev->client, BLANK_ON);
	bfin_disable_dma();
	bfin_disable_ppi();
	dma_desc_list(fbdev, DESTRUCT);
	fbdev->open = 0;
	return 0;
}

static int
bfin_adv7393_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{

	switch (var->bits_per_pixel) {
	case 16:/* DIRECTCOLOUR, 64k */
		var->red.offset = info->var.red.offset;
		var->green.offset = info->var.green.offset;
		var->blue.offset = info->var.blue.offset;
		var->red.length = info->var.red.length;
		var->green.length = info->var.green.length;
		var->blue.length = info->var.blue.length;
		var->transp.offset = 0;
		var->transp.length = 0;
		var->transp.msb_right = 0;
		var->red.msb_right = 0;
		var->green.msb_right = 0;
		var->blue.msb_right = 0;
		break;
	default:
		pr_debug("%s: depth not supported: %u BPP\n", __func__,
			 var->bits_per_pixel);
		return -EINVAL;
	}

	if (info->var.xres != var->xres ||
	    info->var.yres != var->yres ||
	    info->var.xres_virtual != var->xres_virtual ||
	    info->var.yres_virtual != var->yres_virtual) {
		pr_debug("%s: Resolution not supported: X%u x Y%u\n",
			 __func__, var->xres, var->yres);
		return -EINVAL;
	}

	/*
	 *  Memory limit
	 */

	if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
		pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
			 __func__, var->yres_virtual);
		return -ENOMEM;
	}

	return 0;
}

static int
bfin_adv7393_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
{
	int dy;
	u32 dmaaddr;
	struct adv7393fb_device *fbdev = to_adv7393fb_device(info);

	if (!var || !info)
		return -EINVAL;

	if (var->xoffset - info->var.xoffset) {
		/* No support for X panning for now! */
		return -EINVAL;
	}
	dy = var->yoffset - info->var.yoffset;

	if (dy) {
		pr_debug("%s: Panning screen of %d lines\n", __func__, dy);

		dmaaddr = fbdev->av1->start_addr;
		dmaaddr += (info->fix.line_length * dy);
		/* TODO: Wait for current frame to finished */

		fbdev->av1->start_addr = (unsigned long)dmaaddr;
		fbdev->av2->start_addr = (unsigned long)dmaaddr + fbdev->line_len;
	}

	return 0;

}

/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
static int bfin_adv7393_fb_blank(int blank, struct fb_info *info)
{
	struct adv7393fb_device *fbdev = to_adv7393fb_device(info);

	switch (blank) {

	case VESA_NO_BLANKING:
		/* Turn on panel */
		adv7393_mode(fbdev->client, BLANK_OFF);
		break;

	case VESA_VSYNC_SUSPEND:
	case VESA_HSYNC_SUSPEND:
	case VESA_POWERDOWN:
		/* Turn off panel */
		adv7393_mode(fbdev->client, BLANK_ON);
		break;

	default:
		return -EINVAL;
		break;
	}
	return 0;
}

int bfin_adv7393_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
	if (nocursor)
		return 0;
	else
		return -EINVAL;	/* just to force soft_cursor() call */
}

static int bfin_adv7393_fb_setcolreg(u_int regno, u_int red, u_int green,
				     u_int blue, u_int transp,
				     struct fb_info *info)
{
	if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
		return -EINVAL;

	if (info->var.grayscale)
		/* grayscale = 0.30*R + 0.59*G + 0.11*B */
		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;

	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
		u32 value;
		/* Place color in the pseudopalette */
		if (regno > 16)
			return -EINVAL;

		red   >>= (16 - info->var.red.length);
		green >>= (16 - info->var.green.length);
		blue  >>= (16 - info->var.blue.length);

		value = (red   << info->var.red.offset) |
			(green << info->var.green.offset)|
			(blue  << info->var.blue.offset);
		value &= 0xFFFF;

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

	return 0;
}

static int bfin_adv7393_fb_remove(struct i2c_client *client)
{
	struct adv7393fb_device *fbdev = i2c_get_clientdata(client);

	adv7393_mode(client, POWER_DOWN);

	if (fbdev->fb_mem)
		dma_free_coherent(NULL, fbdev->fb_len, fbdev->fb_mem, fbdev->dma_handle);
	free_dma(CH_PPI);
	free_irq(IRQ_PPI_ERROR, fbdev);
	unregister_framebuffer(&fbdev->info);
	remove_proc_entry("driver/adv7393", NULL);
	fb_dealloc_cmap(&fbdev->info.cmap);
	kfree(fbdev->info.pseudo_palette);

	if (ANOMALY_05000400)
		gpio_free(P_IDENT(P_PPI0_FS3));	/* FS3 */
	peripheral_free_list(ppi_pins);
	kfree(fbdev);

	return 0;
}

#ifdef CONFIG_PM
static int bfin_adv7393_fb_suspend(struct device *dev)
{
	struct adv7393fb_device *fbdev = dev_get_drvdata(dev);

	if (fbdev->open) {
		bfin_disable_dma();
		bfin_disable_ppi();
		dma_desc_list(fbdev, DESTRUCT);
	}
	adv7393_mode(fbdev->client, POWER_DOWN);

	return 0;
}

static int bfin_adv7393_fb_resume(struct device *dev)
{
	struct adv7393fb_device *fbdev = dev_get_drvdata(dev);

	adv7393_mode(fbdev->client, POWER_ON);

	if (fbdev->open) {
		dma_desc_list(fbdev, BUILD);
		bfin_config_ppi(fbdev);
		bfin_config_dma(fbdev);
		bfin_enable_ppi();
	}

	return 0;
}

static const struct dev_pm_ops bfin_adv7393_dev_pm_ops = {
	.suspend = bfin_adv7393_fb_suspend,
	.resume  = bfin_adv7393_fb_resume,
};
#endif

static const struct i2c_device_id bfin_adv7393_id[] = {
	{DRIVER_NAME, 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, bfin_adv7393_id);

static struct i2c_driver bfin_adv7393_fb_driver = {
	.driver = {
		.name = DRIVER_NAME,
#ifdef CONFIG_PM
		.pm   = &bfin_adv7393_dev_pm_ops,
#endif
	},
	.probe = bfin_adv7393_fb_probe,
	.remove = bfin_adv7393_fb_remove,
	.id_table = bfin_adv7393_id,
};

static int __init bfin_adv7393_fb_driver_init(void)
{
#if  defined(CONFIG_I2C_BLACKFIN_TWI) || defined(CONFIG_I2C_BLACKFIN_TWI_MODULE)
	request_module("i2c-bfin-twi");
#else
	request_module("i2c-gpio");
#endif

	return i2c_add_driver(&bfin_adv7393_fb_driver);
}
module_init(bfin_adv7393_fb_driver_init);

static void __exit bfin_adv7393_fb_driver_cleanup(void)
{
	i2c_del_driver(&bfin_adv7393_fb_driver);
}
module_exit(bfin_adv7393_fb_driver_cleanup);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Frame buffer driver for ADV7393/2 Video Encoder");

module_param(mode, int, 0);
MODULE_PARM_DESC(mode,
	"Video Mode (0=NTSC,1=PAL,2=NTSC 640x480,3=PAL 640x480,4=NTSC YCbCr input,5=PAL YCbCr input)");

module_param(mem, int, 0);
MODULE_PARM_DESC(mem,
	"Size of frame buffer memory 1=Single 2=Double Size (allows y-panning / frame stacking)");

module_param(nocursor, int, 0644);
MODULE_PARM_DESC(nocursor, "cursor enable/disable");