aboutsummaryrefslogtreecommitdiff
path: root/drivers/video/ep93xx-fb.c
blob: 2e830ec52a5a91664527c32b3108a521e4c6c1c5 (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
/*
 * linux/drivers/video/ep93xx-fb.c
 *
 * Framebuffer support for the EP93xx series.
 *
 * Copyright (C) 2007 Bluewater Systems Ltd
 * Author: Ryan Mallon
 *
 * Copyright (c) 2009 H Hartley Sweeten <hsweeten@visionengravers.com>
 *
 * Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb
 * drivers.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/fb.h>

#include <mach/fb.h>

/* Vertical Frame Timing Registers */
#define EP93XXFB_VLINES_TOTAL			0x0000	/* SW locked */
#define EP93XXFB_VSYNC				0x0004	/* SW locked */
#define EP93XXFB_VACTIVE			0x0008	/* SW locked */
#define EP93XXFB_VBLANK				0x0228	/* SW locked */
#define EP93XXFB_VCLK				0x000c	/* SW locked */

/* Horizontal Frame Timing Registers */
#define EP93XXFB_HCLKS_TOTAL			0x0010	/* SW locked */
#define EP93XXFB_HSYNC				0x0014	/* SW locked */
#define EP93XXFB_HACTIVE			0x0018	/* SW locked */
#define EP93XXFB_HBLANK				0x022c	/* SW locked */
#define EP93XXFB_HCLK				0x001c	/* SW locked */

/* Frame Buffer Memory Configuration Registers */
#define EP93XXFB_SCREEN_PAGE			0x0028
#define EP93XXFB_SCREEN_HPAGE			0x002c
#define EP93XXFB_SCREEN_LINES			0x0030
#define EP93XXFB_LINE_LENGTH			0x0034
#define EP93XXFB_VLINE_STEP			0x0038
#define EP93XXFB_LINE_CARRY			0x003c	/* SW locked */
#define EP93XXFB_EOL_OFFSET			0x0230

/* Other Video Registers */
#define EP93XXFB_BRIGHTNESS			0x0020
#define EP93XXFB_ATTRIBS			0x0024	/* SW locked */
#define EP93XXFB_SWLOCK				0x007c	/* SW locked */
#define EP93XXFB_AC_RATE			0x0214
#define EP93XXFB_FIFO_LEVEL			0x0234
#define EP93XXFB_PIXELMODE			0x0054
#define EP93XXFB_PIXELMODE_32BPP		(0x7 << 0)
#define EP93XXFB_PIXELMODE_24BPP		(0x6 << 0)
#define EP93XXFB_PIXELMODE_16BPP		(0x4 << 0)
#define EP93XXFB_PIXELMODE_8BPP			(0x2 << 0)
#define EP93XXFB_PIXELMODE_SHIFT_1P_24B		(0x0 << 3)
#define EP93XXFB_PIXELMODE_SHIFT_1P_18B		(0x1 << 3)
#define EP93XXFB_PIXELMODE_COLOR_LUT		(0x0 << 10)
#define EP93XXFB_PIXELMODE_COLOR_888		(0x4 << 10)
#define EP93XXFB_PIXELMODE_COLOR_555		(0x5 << 10)
#define EP93XXFB_PARL_IF_OUT			0x0058
#define EP93XXFB_PARL_IF_IN			0x005c

/* Blink Control Registers */
#define EP93XXFB_BLINK_RATE			0x0040
#define EP93XXFB_BLINK_MASK			0x0044
#define EP93XXFB_BLINK_PATTRN			0x0048
#define EP93XXFB_PATTRN_MASK			0x004c
#define EP93XXFB_BKGRND_OFFSET			0x0050

/* Hardware Cursor Registers */
#define EP93XXFB_CURSOR_ADR_START		0x0060
#define EP93XXFB_CURSOR_ADR_RESET		0x0064
#define EP93XXFB_CURSOR_SIZE			0x0068
#define EP93XXFB_CURSOR_COLOR1			0x006c
#define EP93XXFB_CURSOR_COLOR2			0x0070
#define EP93XXFB_CURSOR_BLINK_COLOR1		0x021c
#define EP93XXFB_CURSOR_BLINK_COLOR2		0x0220
#define EP93XXFB_CURSOR_XY_LOC			0x0074
#define EP93XXFB_CURSOR_DSCAN_HY_LOC		0x0078
#define EP93XXFB_CURSOR_BLINK_RATE_CTRL		0x0224

/* LUT Registers */
#define EP93XXFB_GRY_SCL_LUTR			0x0080
#define EP93XXFB_GRY_SCL_LUTG			0x0280
#define EP93XXFB_GRY_SCL_LUTB			0x0300
#define EP93XXFB_LUT_SW_CONTROL			0x0218
#define EP93XXFB_LUT_SW_CONTROL_SWTCH		(1 << 0)
#define EP93XXFB_LUT_SW_CONTROL_SSTAT		(1 << 1)
#define EP93XXFB_COLOR_LUT			0x0400

/* Video Signature Registers */
#define EP93XXFB_VID_SIG_RSLT_VAL		0x0200
#define EP93XXFB_VID_SIG_CTRL			0x0204
#define EP93XXFB_VSIG				0x0208
#define EP93XXFB_HSIG				0x020c
#define EP93XXFB_SIG_CLR_STR			0x0210

/* Minimum / Maximum resolutions supported */
#define EP93XXFB_MIN_XRES			64
#define EP93XXFB_MIN_YRES			64
#define EP93XXFB_MAX_XRES			1024
#define EP93XXFB_MAX_YRES			768

struct ep93xx_fbi {
	struct ep93xxfb_mach_info	*mach_info;
	struct clk			*clk;
	struct resource			*res;
	void __iomem			*mmio_base;
	unsigned int			pseudo_palette[256];
};

static int check_screenpage_bug = 1;
module_param(check_screenpage_bug, int, 0644);
MODULE_PARM_DESC(check_screenpage_bug,
		 "Check for bit 27 screen page bug. Default = 1");

static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi,
					  unsigned int off)
{
	return __raw_readl(fbi->mmio_base + off);
}

static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi,
				   unsigned int val, unsigned int off)
{
	__raw_writel(val, fbi->mmio_base + off);
}

/*
 * Write to one of the locked raster registers.
 */
static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi,
				       unsigned int val, unsigned int reg)
{
	/*
	 * We don't need a lock or delay here since the raster register
	 * block will remain unlocked until the next access.
	 */
	ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK);
	ep93xxfb_writel(fbi, val, reg);
}

static void ep93xxfb_set_video_attribs(struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	unsigned int attribs;

	attribs = EP93XXFB_ENABLE;
	attribs |= fbi->mach_info->flags;
	ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS);
}

static int ep93xxfb_set_pixelmode(struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	unsigned int val;

	info->var.transp.offset = 0;
	info->var.transp.length = 0;

	switch (info->var.bits_per_pixel) {
	case 8:
		val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT |
			EP93XXFB_PIXELMODE_SHIFT_1P_18B;

		info->var.red.offset	= 0;
		info->var.red.length	= 8;
		info->var.green.offset	= 0;
		info->var.green.length	= 8;
		info->var.blue.offset	= 0;
		info->var.blue.length	= 8;
		info->fix.visual 	= FB_VISUAL_PSEUDOCOLOR;
		break;

	case 16:
		val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 |
			EP93XXFB_PIXELMODE_SHIFT_1P_18B;

		info->var.red.offset	= 11;
		info->var.red.length	= 5;
		info->var.green.offset	= 5;
		info->var.green.length	= 6;
		info->var.blue.offset	= 0;
		info->var.blue.length	= 5;
		info->fix.visual 	= FB_VISUAL_TRUECOLOR;
		break;

	case 24:
		val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 |
			EP93XXFB_PIXELMODE_SHIFT_1P_24B;

		info->var.red.offset	= 16;
		info->var.red.length	= 8;
		info->var.green.offset	= 8;
		info->var.green.length	= 8;
		info->var.blue.offset	= 0;
		info->var.blue.length	= 8;
		info->fix.visual 	= FB_VISUAL_TRUECOLOR;
		break;

	case 32:
		val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 |
			EP93XXFB_PIXELMODE_SHIFT_1P_24B;

		info->var.red.offset	= 16;
		info->var.red.length	= 8;
		info->var.green.offset	= 8;
		info->var.green.length	= 8;
		info->var.blue.offset	= 0;
		info->var.blue.length	= 8;
		info->fix.visual 	= FB_VISUAL_TRUECOLOR;
		break;

	default:
		return -EINVAL;
	}

	ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE);
	return 0;
}

static void ep93xxfb_set_timing(struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	unsigned int vlines_total, hclks_total, start, stop;

	vlines_total = info->var.yres + info->var.upper_margin +
		info->var.lower_margin + info->var.vsync_len - 1;

	hclks_total = info->var.xres + info->var.left_margin +
		info->var.right_margin + info->var.hsync_len - 1;

	ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL);
	ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL);

	start = vlines_total;
	stop = vlines_total - info->var.vsync_len;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC);

	start = vlines_total - info->var.vsync_len - info->var.upper_margin;
	stop = info->var.lower_margin - 1;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK);
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE);

	start = vlines_total;
	stop = vlines_total + 1;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK);

	start = hclks_total;
	stop = hclks_total - info->var.hsync_len;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC);

	start = hclks_total - info->var.hsync_len - info->var.left_margin;
	stop = info->var.right_margin - 1;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK);
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE);

	start = hclks_total;
	stop = hclks_total;
	ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK);

	ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY);
}

static int ep93xxfb_set_par(struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;

	clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock));

	ep93xxfb_set_timing(info);

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

	ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE);
	ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES);
	ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel)
			      / 32) - 1, EP93XXFB_LINE_LENGTH);
	ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP);
	ep93xxfb_set_video_attribs(info);
	return 0;
}

static int ep93xxfb_check_var(struct fb_var_screeninfo *var,
			      struct fb_info *info)
{
	int err;

	err = ep93xxfb_set_pixelmode(info);
	if (err)
		return err;

	var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES);
	var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES);
	var->xres_virtual = max(var->xres_virtual, var->xres);

	var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES);
	var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES);
	var->yres_virtual = max(var->yres_virtual, var->yres);

	return 0;
}

static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
	unsigned int offset = vma->vm_pgoff << PAGE_SHIFT;

	if (offset < info->fix.smem_len) {
		return dma_mmap_writecombine(info->dev, vma, info->screen_base,
					     info->fix.smem_start,
					     info->fix.smem_len);
	}

	return -EINVAL;
}

static int ep93xxfb_blank(int blank_mode, struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS);

	if (blank_mode) {
		if (fbi->mach_info->blank)
			fbi->mach_info->blank(blank_mode, info);
		ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE,
				    EP93XXFB_ATTRIBS);
		clk_disable(fbi->clk);
	} else {
		clk_enable(fbi->clk);
		ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE,
				    EP93XXFB_ATTRIBS);
		if (fbi->mach_info->blank)
			fbi->mach_info->blank(blank_mode, info);
	}

	return 0;
}

static inline int ep93xxfb_convert_color(int val, int width)
{
	return ((val << width) + 0x7fff - val) >> 16;
}

static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red,
			      unsigned int green, unsigned int blue,
			      unsigned int transp, struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	unsigned int *pal = info->pseudo_palette;
	unsigned int ctrl, i, rgb, lut_current, lut_stat;

	switch (info->fix.visual) {
	case FB_VISUAL_PSEUDOCOLOR:
		if (regno > 255)
			return 1;
		rgb = ((red & 0xff00) << 8) | (green & 0xff00) |
			((blue & 0xff00) >> 8);

		pal[regno] = rgb;
		ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2)));
		ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL);
		lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT);
		lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH);

		if (lut_stat == lut_current) {
			for (i = 0; i < 256; i++) {
				ep93xxfb_writel(fbi, pal[i],
					EP93XXFB_COLOR_LUT + (i << 2));
			}

			ep93xxfb_writel(fbi,
					ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH,
					EP93XXFB_LUT_SW_CONTROL);
		}
		break;

	case FB_VISUAL_TRUECOLOR:
		if (regno > 16)
			return 1;

		red = ep93xxfb_convert_color(red, info->var.red.length);
		green = ep93xxfb_convert_color(green, info->var.green.length);
		blue = ep93xxfb_convert_color(blue, info->var.blue.length);
		transp = ep93xxfb_convert_color(transp,
						info->var.transp.length);

		pal[regno] = (red << info->var.red.offset) |
			(green << info->var.green.offset) |
			(blue << info->var.blue.offset) |
			(transp << info->var.transp.offset);
		break;

	default:
		return 1;
	}

	return 0;
}

static struct fb_ops ep93xxfb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= ep93xxfb_check_var,
	.fb_set_par	= ep93xxfb_set_par,
	.fb_blank	= ep93xxfb_blank,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_setcolreg	= ep93xxfb_setcolreg,
	.fb_mmap	= ep93xxfb_mmap,
};

static int __init ep93xxfb_calc_fbsize(struct ep93xxfb_mach_info *mach_info)
{
	int i, fb_size = 0;

	if (mach_info->num_modes == EP93XXFB_USE_MODEDB) {
		fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES *
			mach_info->bpp / 8;
	} else {
		for (i = 0; i < mach_info->num_modes; i++) {
			const struct fb_videomode *mode;
			int size;

			mode = &mach_info->modes[i];
			size = mode->xres * mode->yres * mach_info->bpp / 8;
			if (size > fb_size)
				fb_size = size;
		}
	}

	return fb_size;
}

static int __init ep93xxfb_alloc_videomem(struct fb_info *info)
{
	struct ep93xx_fbi *fbi = info->par;
	char __iomem *virt_addr;
	dma_addr_t phys_addr;
	unsigned int fb_size;

	fb_size = ep93xxfb_calc_fbsize(fbi->mach_info);
	virt_addr = dma_alloc_writecombine(info->dev, fb_size,
					   &phys_addr, GFP_KERNEL);
	if (!virt_addr)
		return -ENOMEM;

	/*
	 * There is a bug in the ep93xx framebuffer which causes problems
	 * if bit 27 of the physical address is set.
	 * See: http://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2
	 * There does not seem to be any official errata for this, but I
	 * have confirmed the problem exists on my hardware (ep9315) at
	 * least.
	 */
	if (check_screenpage_bug && phys_addr & (1 << 27)) {
		dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) "
			"has bit 27 set: cannot init framebuffer\n",
			phys_addr);

		dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr);
		return -ENOMEM;
	}

	info->fix.smem_start = phys_addr;
	info->fix.smem_len = fb_size;
	info->screen_base = virt_addr;

	return 0;
}

static void ep93xxfb_dealloc_videomem(struct fb_info *info)
{
	if (info->screen_base)
		dma_free_coherent(info->dev, info->fix.smem_len,
				  info->screen_base, info->fix.smem_start);
}

static int __devinit ep93xxfb_probe(struct platform_device *pdev)
{
	struct ep93xxfb_mach_info *mach_info = pdev->dev.platform_data;
	struct fb_info *info;
	struct ep93xx_fbi *fbi;
	struct resource *res;
	char *video_mode;
	int err;

	if (!mach_info)
		return -EINVAL;

	info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev);
	if (!info)
		return -ENOMEM;

	info->dev = &pdev->dev;
	platform_set_drvdata(pdev, info);
	fbi = info->par;
	fbi->mach_info = mach_info;

	err = fb_alloc_cmap(&info->cmap, 256, 0);
	if (err)
		goto failed;

	err = ep93xxfb_alloc_videomem(info);
	if (err)
		goto failed;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		err = -ENXIO;
		goto failed;
	}

	res = request_mem_region(res->start, resource_size(res), pdev->name);
	if (!res) {
		err = -EBUSY;
		goto failed;
	}

	fbi->res = res;
	fbi->mmio_base = ioremap(res->start, resource_size(res));
	if (!fbi->mmio_base) {
		err = -ENXIO;
		goto failed;
	}

	strcpy(info->fix.id, pdev->name);
	info->fbops		= &ep93xxfb_ops;
	info->fix.type		= FB_TYPE_PACKED_PIXELS;
	info->fix.accel		= FB_ACCEL_NONE;
	info->var.activate	= FB_ACTIVATE_NOW;
	info->var.vmode		= FB_VMODE_NONINTERLACED;
	info->flags		= FBINFO_DEFAULT;
	info->node		= -1;
	info->state		= FBINFO_STATE_RUNNING;
	info->pseudo_palette	= &fbi->pseudo_palette;

	fb_get_options("ep93xx-fb", &video_mode);
	err = fb_find_mode(&info->var, info, video_mode,
			   fbi->mach_info->modes, fbi->mach_info->num_modes,
			   fbi->mach_info->default_mode, fbi->mach_info->bpp);
	if (err == 0) {
		dev_err(info->dev, "No suitable video mode found\n");
		err = -EINVAL;
		goto failed;
	}

	if (mach_info->setup) {
		err = mach_info->setup(pdev);
		if (err)
			return err;
	}

	err = ep93xxfb_check_var(&info->var, info);
	if (err)
		goto failed;

	fbi->clk = clk_get(info->dev, NULL);
	if (IS_ERR(fbi->clk)) {
		err = PTR_ERR(fbi->clk);
		fbi->clk = NULL;
		goto failed;
	}

	ep93xxfb_set_par(info);
	clk_enable(fbi->clk);

	err = register_framebuffer(info);
	if (err)
		goto failed;

	dev_info(info->dev, "registered. Mode = %dx%d-%d\n",
		 info->var.xres, info->var.yres, info->var.bits_per_pixel);
	return 0;

failed:
	if (fbi->clk)
		clk_put(fbi->clk);
	if (fbi->mmio_base)
		iounmap(fbi->mmio_base);
	if (fbi->res)
		release_mem_region(fbi->res->start, resource_size(fbi->res));
	ep93xxfb_dealloc_videomem(info);
	if (&info->cmap)
		fb_dealloc_cmap(&info->cmap);
	if (fbi->mach_info->teardown)
		fbi->mach_info->teardown(pdev);
	kfree(info);
	platform_set_drvdata(pdev, NULL);

	return err;
}

static int __devexit ep93xxfb_remove(struct platform_device *pdev)
{
	struct fb_info *info = platform_get_drvdata(pdev);
	struct ep93xx_fbi *fbi = info->par;

	unregister_framebuffer(info);
	clk_disable(fbi->clk);
	clk_put(fbi->clk);
	iounmap(fbi->mmio_base);
	release_mem_region(fbi->res->start, resource_size(fbi->res));
	ep93xxfb_dealloc_videomem(info);
	fb_dealloc_cmap(&info->cmap);

	if (fbi->mach_info->teardown)
		fbi->mach_info->teardown(pdev);

	kfree(info);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver ep93xxfb_driver = {
	.probe		= ep93xxfb_probe,
	.remove		= __devexit_p(ep93xxfb_remove),
	.driver = {
		.name	= "ep93xx-fb",
		.owner	= THIS_MODULE,
	},
};

static int __devinit ep93xxfb_init(void)
{
	return platform_driver_register(&ep93xxfb_driver);
}

static void __exit ep93xxfb_exit(void)
{
	platform_driver_unregister(&ep93xxfb_driver);
}

module_init(ep93xxfb_init);
module_exit(ep93xxfb_exit);

MODULE_DESCRIPTION("EP93XX Framebuffer Driver");
MODULE_ALIAS("platform:ep93xx-fb");
MODULE_AUTHOR("Ryan Mallon, "
	      "H Hartley Sweeten <hsweeten@visionengravers.com");
MODULE_LICENSE("GPL");