summaryrefslogtreecommitdiff
path: root/drivers/video/fbdev/sh7760fb.c
blob: 3d2a27fefc874a766b27c0ab9984bb2676d5abb5 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * SH7760/SH7763 LCDC Framebuffer driver.
 *
 * (c) 2006-2008 MSC Vertriebsges.m.b.H.,
 *             Manuel Lauss <mano@roarinelk.homelinux.net>
 * (c) 2008 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
 *
 * PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.rst!
 *
 * Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de>
 *     for his original source and testing!
 *
 * sh7760_setcolreg get from drivers/video/sh_mobile_lcdcfb.c
 */

#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/fb.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <asm/sh7760fb.h>

struct sh7760fb_par {
	void __iomem *base;
	int irq;

	struct sh7760fb_platdata *pd;	/* display information */

	dma_addr_t fbdma;	/* physical address */

	int rot;		/* rotation enabled? */

	u32 pseudo_palette[16];

	struct platform_device *dev;
	struct resource *ioarea;
	struct completion vsync;	/* vsync irq event */
};

static irqreturn_t sh7760fb_irq(int irq, void *data)
{
	struct completion *c = data;

	complete(c);

	return IRQ_HANDLED;
}

/* wait_for_lps - wait until power supply has reached a certain state. */
static int wait_for_lps(struct sh7760fb_par *par, int val)
{
	int i = 100;
	while (--i && ((ioread16(par->base + LDPMMR) & 3) != val))
		msleep(1);

	if (i <= 0)
		return -ETIMEDOUT;

	return 0;
}

/* en/disable the LCDC */
static int sh7760fb_blank(int blank, struct fb_info *info)
{
	struct sh7760fb_par *par = info->par;
	struct sh7760fb_platdata *pd = par->pd;
	unsigned short cntr = ioread16(par->base + LDCNTR);
	unsigned short intr = ioread16(par->base + LDINTR);
	int lps;

	if (blank == FB_BLANK_UNBLANK) {
		intr |= VINT_START;
		cntr = LDCNTR_DON2 | LDCNTR_DON;
		lps = 3;
	} else {
		intr &= ~VINT_START;
		cntr = LDCNTR_DON2;
		lps = 0;
	}

	if (pd->blank)
		pd->blank(blank);

	iowrite16(intr, par->base + LDINTR);
	iowrite16(cntr, par->base + LDCNTR);

	return wait_for_lps(par, lps);
}

static int sh7760_setcolreg (u_int regno,
	u_int red, u_int green, u_int blue,
	u_int transp, struct fb_info *info)
{
	u32 *palette = info->pseudo_palette;

	if (regno >= 16)
		return -EINVAL;

	/* only FB_VISUAL_TRUECOLOR supported */

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

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

	return 0;
}

static int sh7760fb_get_color_info(struct fb_info *info,
				   u16 lddfr, int *bpp, int *gray)
{
	int lbpp, lgray;

	lgray = lbpp = 0;

	switch (lddfr & LDDFR_COLOR_MASK) {
	case LDDFR_1BPP_MONO:
		lgray = 1;
		lbpp = 1;
		break;
	case LDDFR_2BPP_MONO:
		lgray = 1;
		lbpp = 2;
		break;
	case LDDFR_4BPP_MONO:
		lgray = 1;
		fallthrough;
	case LDDFR_4BPP:
		lbpp = 4;
		break;
	case LDDFR_6BPP_MONO:
		lgray = 1;
		fallthrough;
	case LDDFR_8BPP:
		lbpp = 8;
		break;
	case LDDFR_16BPP_RGB555:
	case LDDFR_16BPP_RGB565:
		lbpp = 16;
		lgray = 0;
		break;
	default:
		fb_dbg(info, "unsupported LDDFR bit depth.\n");
		return -EINVAL;
	}

	if (bpp)
		*bpp = lbpp;
	if (gray)
		*gray = lgray;

	return 0;
}

static int sh7760fb_check_var(struct fb_var_screeninfo *var,
			      struct fb_info *info)
{
	struct fb_fix_screeninfo *fix = &info->fix;
	struct sh7760fb_par *par = info->par;
	int ret, bpp;

	/* get color info from register value */
	ret = sh7760fb_get_color_info(info, par->pd->lddfr, &bpp, NULL);
	if (ret)
		return ret;

	var->bits_per_pixel = bpp;

	if ((var->grayscale) && (var->bits_per_pixel == 1))
		fix->visual = FB_VISUAL_MONO10;
	else if (var->bits_per_pixel >= 15)
		fix->visual = FB_VISUAL_TRUECOLOR;
	else
		fix->visual = FB_VISUAL_PSEUDOCOLOR;

	/* TODO: add some more validation here */
	return 0;
}

/*
 * sh7760fb_set_par - set videomode.
 *
 * NOTE: The rotation, grayscale and DSTN codepaths are
 *     totally untested!
 */
static int sh7760fb_set_par(struct fb_info *info)
{
	struct sh7760fb_par *par = info->par;
	struct fb_videomode *vm = par->pd->def_mode;
	unsigned long sbase, dstn_off, ldsarl, stride;
	unsigned short hsynp, hsynw, htcn, hdcn;
	unsigned short vsynp, vsynw, vtln, vdln;
	unsigned short lddfr, ldmtr;
	int ret, bpp, gray;

	par->rot = par->pd->rotate;

	/* rotate only works with xres <= 320 */
	if (par->rot && (vm->xres > 320)) {
		fb_dbg(info, "rotation disabled due to display size\n");
		par->rot = 0;
	}

	/* calculate LCDC reg vals from display parameters */
	hsynp = vm->right_margin + vm->xres;
	hsynw = vm->hsync_len;
	htcn = vm->left_margin + hsynp + hsynw;
	hdcn = vm->xres;
	vsynp = vm->lower_margin + vm->yres;
	vsynw = vm->vsync_len;
	vtln = vm->upper_margin + vsynp + vsynw;
	vdln = vm->yres;

	/* get color info from register value */
	ret = sh7760fb_get_color_info(info, par->pd->lddfr, &bpp, &gray);
	if (ret)
		return ret;

	fb_dbg(info, "%dx%d %dbpp %s (orientation %s)\n", hdcn,
		vdln, bpp, gray ? "grayscale" : "color",
		par->rot ? "rotated" : "normal");

#ifdef CONFIG_CPU_LITTLE_ENDIAN
	lddfr = par->pd->lddfr | (1 << 8);
#else
	lddfr = par->pd->lddfr & ~(1 << 8);
#endif

	ldmtr = par->pd->ldmtr;

	if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT))
		ldmtr |= LDMTR_CL1POL;
	if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT))
		ldmtr |= LDMTR_FLMPOL;

	/* shut down LCDC before changing display parameters */
	sh7760fb_blank(FB_BLANK_POWERDOWN, info);

	iowrite16(par->pd->ldickr, par->base + LDICKR);	/* pixclock */
	iowrite16(ldmtr, par->base + LDMTR);	/* polarities */
	iowrite16(lddfr, par->base + LDDFR);	/* color/depth */
	iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR);	/* rotate */
	iowrite16(par->pd->ldpmmr, par->base + LDPMMR);	/* Power Management */
	iowrite16(par->pd->ldpspr, par->base + LDPSPR);	/* Power Supply Ctrl */

	/* display resolution */
	iowrite16(((htcn >> 3) - 1) | (((hdcn >> 3) - 1) << 8),
		  par->base + LDHCNR);
	iowrite16(vdln - 1, par->base + LDVDLNR);
	iowrite16(vtln - 1, par->base + LDVTLNR);
	/* h/v sync signals */
	iowrite16((vsynp - 1) | ((vsynw - 1) << 12), par->base + LDVSYNR);
	iowrite16(((hsynp >> 3) - 1) | (((hsynw >> 3) - 1) << 12),
		  par->base + LDHSYNR);
	/* AC modulation sig */
	iowrite16(par->pd->ldaclnr, par->base + LDACLNR);

	stride = (par->rot) ? vtln : hdcn;
	if (!gray)
		stride *= (bpp + 7) >> 3;
	else {
		if (bpp == 1)
			stride >>= 3;
		else if (bpp == 2)
			stride >>= 2;
		else if (bpp == 4)
			stride >>= 1;
		/* 6 bpp == 8 bpp */
	}

	/* if rotated, stride must be power of 2 */
	if (par->rot) {
		unsigned long bit = 1 << 31;
		while (bit) {
			if (stride & bit)
				break;
			bit >>= 1;
		}
		if (stride & ~bit)
			stride = bit << 1;	/* not P-o-2, round up */
	}
	iowrite16(stride, par->base + LDLAOR);

	/* set display mem start address */
	sbase = (unsigned long)par->fbdma;
	if (par->rot)
		sbase += (hdcn - 1) * stride;

	iowrite32(sbase, par->base + LDSARU);

	/*
	 * for DSTN need to set address for lower half.
	 * I (mlau) don't know which address to set it to,
	 * so I guessed at (stride * yres/2).
	 */
	if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) &&
	    ((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) {

		fb_dbg(info, " ***** DSTN untested! *****\n");

		dstn_off = stride;
		if (par->rot)
			dstn_off *= hdcn >> 1;
		else
			dstn_off *= vdln >> 1;

		ldsarl = sbase + dstn_off;
	} else
		ldsarl = 0;

	iowrite32(ldsarl, par->base + LDSARL);	/* mem for lower half of DSTN */

	info->fix.line_length = stride;

	sh7760fb_check_var(&info->var, info);

	sh7760fb_blank(FB_BLANK_UNBLANK, info);	/* panel on! */

	fb_dbg(info, "hdcn  : %6d htcn  : %6d\n", hdcn, htcn);
	fb_dbg(info, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp);
	fb_dbg(info, "vdln  : %6d vtln  : %6d\n", vdln, vtln);
	fb_dbg(info, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp);
	fb_dbg(info, "clksrc: %6d clkdiv: %6d\n",
		(par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f);
	fb_dbg(info, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr,
		par->pd->ldpspr);
	fb_dbg(info, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr);
	fb_dbg(info, "ldlaor: %ld\n", stride);
	fb_dbg(info, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl);

	return 0;
}

static const struct fb_ops sh7760fb_ops = {
	.owner = THIS_MODULE,
	FB_DEFAULT_IOMEM_OPS,
	.fb_blank = sh7760fb_blank,
	.fb_check_var = sh7760fb_check_var,
	.fb_setcolreg = sh7760_setcolreg,
	.fb_set_par = sh7760fb_set_par,
};

static void sh7760fb_free_mem(struct fb_info *info)
{
	struct sh7760fb_par *par = info->par;

	if (!info->screen_base)
		return;

	dma_free_coherent(info->device, info->screen_size,
			  info->screen_base, par->fbdma);

	par->fbdma = 0;
	info->screen_base = NULL;
	info->screen_size = 0;
}

/* allocate the framebuffer memory. This memory must be in Area3,
 * (dictated by the DMA engine) and contiguous, at a 512 byte boundary.
 */
static int sh7760fb_alloc_mem(struct fb_info *info)
{
	struct sh7760fb_par *par = info->par;
	void *fbmem;
	unsigned long vram;
	int ret, bpp;

	if (info->screen_base)
		return 0;

	/* get color info from register value */
	ret = sh7760fb_get_color_info(info, par->pd->lddfr, &bpp, NULL);
	if (ret) {
		printk(KERN_ERR "colinfo\n");
		return ret;
	}

	/* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page
	   max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */

	vram = info->var.xres * info->var.yres;
	if (info->var.grayscale) {
		if (bpp == 1)
			vram >>= 3;
		else if (bpp == 2)
			vram >>= 2;
		else if (bpp == 4)
			vram >>= 1;
	} else if (bpp > 8)
		vram *= 2;
	if ((vram < 1) || (vram > 1024 * 2048)) {
		fb_dbg(info, "too much VRAM required. Check settings\n");
		return -ENODEV;
	}

	if (vram < PAGE_SIZE)
		vram = PAGE_SIZE;

	fbmem = dma_alloc_coherent(info->device, vram, &par->fbdma, GFP_KERNEL);

	if (!fbmem)
		return -ENOMEM;

	if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) {
		sh7760fb_free_mem(info);
		dev_err(info->device, "kernel gave me memory at 0x%08lx, which is"
			"unusable for the LCDC\n", (unsigned long)par->fbdma);
		return -ENOMEM;
	}

	info->screen_base = fbmem;
	info->screen_size = vram;
	info->fix.smem_start = (unsigned long)info->screen_base;
	info->fix.smem_len = info->screen_size;

	return 0;
}

static int sh7760fb_probe(struct platform_device *pdev)
{
	struct fb_info *info;
	struct resource *res;
	struct sh7760fb_par *par;
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (unlikely(res == NULL)) {
		dev_err(&pdev->dev, "invalid resource\n");
		return -EINVAL;
	}

	info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev);
	if (!info)
		return -ENOMEM;

	par = info->par;
	par->dev = pdev;

	par->pd = pdev->dev.platform_data;
	if (!par->pd) {
		dev_dbg(&pdev->dev, "no display setup data!\n");
		ret = -ENODEV;
		goto out_fb;
	}

	par->ioarea = request_mem_region(res->start,
					 resource_size(res), pdev->name);
	if (!par->ioarea) {
		dev_err(&pdev->dev, "mmio area busy\n");
		ret = -EBUSY;
		goto out_fb;
	}

	par->base = ioremap(res->start, resource_size(res));
	if (!par->base) {
		dev_err(&pdev->dev, "cannot remap\n");
		ret = -ENODEV;
		goto out_res;
	}

	iowrite16(0, par->base + LDINTR);	/* disable vsync irq */
	par->irq = platform_get_irq(pdev, 0);
	if (par->irq >= 0) {
		ret = request_irq(par->irq, sh7760fb_irq, 0,
				  "sh7760-lcdc", &par->vsync);
		if (ret) {
			dev_err(&pdev->dev, "cannot grab IRQ\n");
			par->irq = -ENXIO;
		} else
			disable_irq_nosync(par->irq);
	}

	fb_videomode_to_var(&info->var, par->pd->def_mode);

	ret = sh7760fb_alloc_mem(info);
	if (ret) {
		dev_dbg(info->device, "framebuffer memory allocation failed!\n");
		goto out_unmap;
	}

	info->pseudo_palette = par->pseudo_palette;

	/* fixup color register bitpositions. These are fixed by hardware */
	info->var.red.offset = 11;
	info->var.red.length = 5;
	info->var.red.msb_right = 0;

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

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

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

	strcpy(info->fix.id, "sh7760-lcdc");

	/* set the DON2 bit now, before cmap allocation, as it will randomize
	 * palette memory.
	 */
	iowrite16(LDCNTR_DON2, par->base + LDCNTR);
	info->fbops = &sh7760fb_ops;

	ret = fb_alloc_cmap(&info->cmap, 256, 0);
	if (ret) {
		dev_dbg(&pdev->dev, "Unable to allocate cmap memory\n");
		goto out_mem;
	}

	ret = register_framebuffer(info);
	if (ret < 0) {
		dev_dbg(&pdev->dev, "cannot register fb!\n");
		goto out_cmap;
	}
	platform_set_drvdata(pdev, info);

	printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n",
	       pdev->name,
	       (unsigned long)par->fbdma,
	       (unsigned long)(par->fbdma + info->screen_size - 1),
	       info->screen_size >> 10);

	return 0;

out_cmap:
	sh7760fb_blank(FB_BLANK_POWERDOWN, info);
	fb_dealloc_cmap(&info->cmap);
out_mem:
	sh7760fb_free_mem(info);
out_unmap:
	if (par->irq >= 0)
		free_irq(par->irq, &par->vsync);
	iounmap(par->base);
out_res:
	release_mem_region(res->start, resource_size(res));
out_fb:
	framebuffer_release(info);
	return ret;
}

static void sh7760fb_remove(struct platform_device *dev)
{
	struct fb_info *info = platform_get_drvdata(dev);
	struct sh7760fb_par *par = info->par;

	sh7760fb_blank(FB_BLANK_POWERDOWN, info);
	unregister_framebuffer(info);
	fb_dealloc_cmap(&info->cmap);
	sh7760fb_free_mem(info);
	if (par->irq >= 0)
		free_irq(par->irq, &par->vsync);
	iounmap(par->base);
	release_mem_region(par->ioarea->start, resource_size(par->ioarea));
	framebuffer_release(info);
}

static struct platform_driver sh7760_lcdc_driver = {
	.driver = {
		   .name = "sh7760-lcdc",
		   },
	.probe = sh7760fb_probe,
	.remove = sh7760fb_remove,
};

module_platform_driver(sh7760_lcdc_driver);

MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss");
MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller");
MODULE_LICENSE("GPL v2");