summaryrefslogtreecommitdiffstats
path: root/drivers/video/amba-clcd.c
blob: 075d3961a119e8f27294cd77193f8fee7908a521 (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
/*
 *  linux/drivers/video/amba-clcd.c
 *
 * Copyright (C) 2001 ARM Limited, by David A Rusling
 * Updated to 2.5, Deep Blue Solutions Ltd.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 *
 *  ARM PrimeCell PL110 Color LCD Controller
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/list.h>

#include <asm/hardware/amba.h>
#include <asm/hardware/clock.h>

#include <asm/hardware/amba_clcd.h>

#define to_clcd(info)	container_of(info, struct clcd_fb, fb)

/* This is limited to 16 characters when displayed by X startup */
static const char *clcd_name = "CLCD FB";

/*
 * Unfortunately, the enable/disable functions may be called either from
 * process or IRQ context, and we _need_ to delay.  This is _not_ good.
 */
static inline void clcdfb_sleep(unsigned int ms)
{
	if (in_atomic()) {
		mdelay(ms);
	} else {
		msleep(ms);
	}
}

static inline void clcdfb_set_start(struct clcd_fb *fb)
{
	unsigned long ustart = fb->fb.fix.smem_start;
	unsigned long lstart;

	ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
	lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;

	writel(ustart, fb->regs + CLCD_UBAS);
	writel(lstart, fb->regs + CLCD_LBAS);
}

static void clcdfb_disable(struct clcd_fb *fb)
{
	u32 val;

	if (fb->board->disable)
		fb->board->disable(fb);

	val = readl(fb->regs + CLCD_CNTL);
	if (val & CNTL_LCDPWR) {
		val &= ~CNTL_LCDPWR;
		writel(val, fb->regs + CLCD_CNTL);

		clcdfb_sleep(20);
	}
	if (val & CNTL_LCDEN) {
		val &= ~CNTL_LCDEN;
		writel(val, fb->regs + CLCD_CNTL);
	}

	/*
	 * Disable CLCD clock source.
	 */
	clk_disable(fb->clk);
}

static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
{
	/*
	 * Enable the CLCD clock source.
	 */
	clk_enable(fb->clk);

	/*
	 * Bring up by first enabling..
	 */
	cntl |= CNTL_LCDEN;
	writel(cntl, fb->regs + CLCD_CNTL);

	clcdfb_sleep(20);

	/*
	 * and now apply power.
	 */
	cntl |= CNTL_LCDPWR;
	writel(cntl, fb->regs + CLCD_CNTL);

	/*
	 * finally, enable the interface.
	 */
	if (fb->board->enable)
		fb->board->enable(fb);
}

static int
clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
{
	int ret = 0;

	memset(&var->transp, 0, sizeof(var->transp));
	memset(&var->red, 0, sizeof(var->red));
	memset(&var->green, 0, sizeof(var->green));
	memset(&var->blue, 0, sizeof(var->blue));

	switch (var->bits_per_pixel) {
	case 1:
	case 2:
	case 4:
	case 8:
		var->red.length		= var->bits_per_pixel;
		var->red.offset		= 0;
		var->green.length	= var->bits_per_pixel;
		var->green.offset	= 0;
		var->blue.length	= var->bits_per_pixel;
		var->blue.offset	= 0;
		break;
	case 16:
		var->red.length		= 5;
		var->green.length	= 5;
		var->blue.length	= 5;
		if (fb->panel->cntl & CNTL_BGR) {
			var->red.offset		= 10;
			var->green.offset	= 5;
			var->blue.offset	= 0;
		} else {
			var->red.offset		= 0;
			var->green.offset	= 5;
			var->blue.offset	= 10;
		}
		break;
	case 24:
		if (fb->panel->cntl & CNTL_LCDTFT) {
			var->red.length		= 8;
			var->green.length	= 8;
			var->blue.length	= 8;

			if (fb->panel->cntl & CNTL_BGR) {
				var->red.offset		= 16;
				var->green.offset	= 8;
				var->blue.offset	= 0;
			} else {
				var->red.offset		= 0;
				var->green.offset	= 8;
				var->blue.offset	= 16;
			}
			break;
		}
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	struct clcd_fb *fb = to_clcd(info);
	int ret = -EINVAL;

	if (fb->board->check)
		ret = fb->board->check(fb, var);
	if (ret == 0)
		ret = clcdfb_set_bitfields(fb, var);

	return ret;
}

static int clcdfb_set_par(struct fb_info *info)
{
	struct clcd_fb *fb = to_clcd(info);
	struct clcd_regs regs;

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

	if (fb->fb.var.bits_per_pixel <= 8)
		fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
	else
		fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;

	fb->board->decode(fb, &regs);

	clcdfb_disable(fb);

	writel(regs.tim0, fb->regs + CLCD_TIM0);
	writel(regs.tim1, fb->regs + CLCD_TIM1);
	writel(regs.tim2, fb->regs + CLCD_TIM2);
	writel(regs.tim3, fb->regs + CLCD_TIM3);

	clcdfb_set_start(fb);

	clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);

	fb->clcd_cntl = regs.cntl;

	clcdfb_enable(fb, regs.cntl);

#ifdef DEBUG
	printk(KERN_INFO "CLCD: Registers set to\n"
	       KERN_INFO "  %08x %08x %08x %08x\n"
	       KERN_INFO "  %08x %08x %08x %08x\n",
		readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
		readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
		readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
		readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL));
#endif

	return 0;
}

static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
{
	unsigned int mask = (1 << bf->length) - 1;

	return (val >> (16 - bf->length) & mask) << bf->offset;
}

/*
 *  Set a single color register. The values supplied have a 16 bit
 *  magnitude.  Return != 0 for invalid regno.
 */
static int
clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
		 unsigned int blue, unsigned int transp, struct fb_info *info)
{
	struct clcd_fb *fb = to_clcd(info);

	if (regno < 16)
		fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
				  convert_bitfield(blue, &fb->fb.var.blue) |
				  convert_bitfield(green, &fb->fb.var.green) |
				  convert_bitfield(red, &fb->fb.var.red);

	if (fb->fb.var.bits_per_pixel == 8 && regno < 256) {
		int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
		u32 val, mask, newval;

		newval  = (red >> 11)  & 0x001f;
		newval |= (green >> 6) & 0x03e0;
		newval |= (blue >> 1)  & 0x7c00;

		/*
		 * 3.2.11: if we're configured for big endian
		 * byte order, the palette entries are swapped.
		 */
		if (fb->clcd_cntl & CNTL_BEBO)
			regno ^= 1;

		if (regno & 1) {
			newval <<= 16;
			mask = 0x0000ffff;
		} else {
			mask = 0xffff0000;
		}

		val = readl(fb->regs + hw_reg) & mask;
		writel(val | newval, fb->regs + hw_reg);
	}

	return regno > 255;
}

/*
 *  Blank the screen if blank_mode != 0, else unblank. If blank == NULL
 *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
 *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
 *  to e.g. a video mode which doesn't support it. Implements VESA suspend
 *  and powerdown modes on hardware that supports disabling hsync/vsync:
 *    blank_mode == 2: suspend vsync
 *    blank_mode == 3: suspend hsync
 *    blank_mode == 4: powerdown
 */
static int clcdfb_blank(int blank_mode, struct fb_info *info)
{
	struct clcd_fb *fb = to_clcd(info);

	if (blank_mode != 0) {
		clcdfb_disable(fb);
	} else {
		clcdfb_enable(fb, fb->clcd_cntl);
	}
	return 0;
}

static int clcdfb_mmap(struct fb_info *info, struct file *file,
		       struct vm_area_struct *vma)
{
	struct clcd_fb *fb = to_clcd(info);
	unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
	int ret = -EINVAL;

	len = info->fix.smem_len;

	if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
	    fb->board->mmap)
		ret = fb->board->mmap(fb, vma);

	return ret;
}

static struct fb_ops clcdfb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= clcdfb_check_var,
	.fb_set_par	= clcdfb_set_par,
	.fb_setcolreg	= clcdfb_setcolreg,
	.fb_blank	= clcdfb_blank,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_cursor	= soft_cursor,
	.fb_mmap	= clcdfb_mmap,
};

static int clcdfb_register(struct clcd_fb *fb)
{
	int ret;

	fb->clk = clk_get(&fb->dev->dev, "CLCDCLK");
	if (IS_ERR(fb->clk)) {
		ret = PTR_ERR(fb->clk);
		goto out;
	}

	ret = clk_use(fb->clk);
	if (ret)
		goto free_clk;

	fb->fb.fix.mmio_start	= fb->dev->res.start;
	fb->fb.fix.mmio_len	= SZ_4K;

	fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
	if (!fb->regs) {
		printk(KERN_ERR "CLCD: unable to remap registers\n");
		ret = -ENOMEM;
		goto unuse_clk;
	}

	fb->fb.fbops		= &clcdfb_ops;
	fb->fb.flags		= FBINFO_FLAG_DEFAULT;
	fb->fb.pseudo_palette	= fb->cmap;

	strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
	fb->fb.fix.type		= FB_TYPE_PACKED_PIXELS;
	fb->fb.fix.type_aux	= 0;
	fb->fb.fix.xpanstep	= 0;
	fb->fb.fix.ypanstep	= 0;
	fb->fb.fix.ywrapstep	= 0;
	fb->fb.fix.accel	= FB_ACCEL_NONE;

	fb->fb.var.xres		= fb->panel->mode.xres;
	fb->fb.var.yres		= fb->panel->mode.yres;
	fb->fb.var.xres_virtual	= fb->panel->mode.xres;
	fb->fb.var.yres_virtual	= fb->panel->mode.yres;
	fb->fb.var.bits_per_pixel = fb->panel->bpp;
	fb->fb.var.grayscale	= fb->panel->grayscale;
	fb->fb.var.pixclock	= fb->panel->mode.pixclock;
	fb->fb.var.left_margin	= fb->panel->mode.left_margin;
	fb->fb.var.right_margin	= fb->panel->mode.right_margin;
	fb->fb.var.upper_margin	= fb->panel->mode.upper_margin;
	fb->fb.var.lower_margin	= fb->panel->mode.lower_margin;
	fb->fb.var.hsync_len	= fb->panel->mode.hsync_len;
	fb->fb.var.vsync_len	= fb->panel->mode.vsync_len;
	fb->fb.var.sync		= fb->panel->mode.sync;
	fb->fb.var.vmode	= fb->panel->mode.vmode;
	fb->fb.var.activate	= FB_ACTIVATE_NOW;
	fb->fb.var.nonstd	= 0;
	fb->fb.var.height	= fb->panel->height;
	fb->fb.var.width	= fb->panel->width;
	fb->fb.var.accel_flags	= 0;

	fb->fb.monspecs.hfmin	= 0;
	fb->fb.monspecs.hfmax   = 100000;
	fb->fb.monspecs.vfmin	= 0;
	fb->fb.monspecs.vfmax	= 400;
	fb->fb.monspecs.dclkmin = 1000000;
	fb->fb.monspecs.dclkmax	= 100000000;

	/*
	 * Make sure that the bitfields are set appropriately.
	 */
	clcdfb_set_bitfields(fb, &fb->fb.var);

	/*
	 * Allocate colourmap.
	 */
	fb_alloc_cmap(&fb->fb.cmap, 256, 0);

	/*
	 * Ensure interrupts are disabled.
	 */
	writel(0, fb->regs + CLCD_IENB);

	fb_set_var(&fb->fb, &fb->fb.var);

        printk(KERN_INFO "CLCD: %s hardware, %s display\n",
               fb->board->name, fb->panel->mode.name);

	ret = register_framebuffer(&fb->fb);
	if (ret == 0)
		goto out;

	printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);

	iounmap(fb->regs);
 unuse_clk:
	clk_unuse(fb->clk);
 free_clk:
	clk_put(fb->clk);
 out:
	return ret;
}

static int clcdfb_probe(struct amba_device *dev, void *id)
{
	struct clcd_board *board = dev->dev.platform_data;
	struct clcd_fb *fb;
	int ret;

	if (!board)
		return -EINVAL;

	ret = amba_request_regions(dev, NULL);
	if (ret) {
		printk(KERN_ERR "CLCD: unable to reserve regs region\n");
		goto out;
	}

	fb = (struct clcd_fb *) kmalloc(sizeof(struct clcd_fb), GFP_KERNEL);
	if (!fb) {
		printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
		ret = -ENOMEM;
		goto free_region;
	}
	memset(fb, 0, sizeof(struct clcd_fb));

	fb->dev = dev;
	fb->board = board;

	ret = fb->board->setup(fb);
	if (ret)
		goto free_fb;

	ret = clcdfb_register(fb); 
	if (ret == 0) {
		amba_set_drvdata(dev, fb);
		goto out;
	}

	fb->board->remove(fb);
 free_fb:
	kfree(fb);
 free_region:
	amba_release_regions(dev);
 out:
	return ret;
}

static int clcdfb_remove(struct amba_device *dev)
{
	struct clcd_fb *fb = amba_get_drvdata(dev);

	amba_set_drvdata(dev, NULL);

	clcdfb_disable(fb);
	unregister_framebuffer(&fb->fb);
	iounmap(fb->regs);
	clk_unuse(fb->clk);
	clk_put(fb->clk);

	fb->board->remove(fb);

	kfree(fb);

	amba_release_regions(dev);

	return 0;
}

static struct amba_id clcdfb_id_table[] = {
	{
		.id	= 0x00041110,
		.mask	= 0x000fffff,
	},
	{ 0, 0 },
};

static struct amba_driver clcd_driver = {
	.drv 		= {
		.name	= "clcd-pl110",
	},
	.probe		= clcdfb_probe,
	.remove		= clcdfb_remove,
	.id_table	= clcdfb_id_table,
};

int __init amba_clcdfb_init(void)
{
	if (fb_get_options("ambafb", NULL))
		return -ENODEV;

	return amba_driver_register(&clcd_driver);
}

module_init(amba_clcdfb_init);

static void __exit amba_clcdfb_exit(void)
{
	amba_driver_unregister(&clcd_driver);
}

module_exit(amba_clcdfb_exit);

MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
MODULE_LICENSE("GPL");