summaryrefslogtreecommitdiff
path: root/drivers/video/fbdev/vt8500lcdfb.c
blob: be8d9702cbb2d55acfedcef9180778a2f5332c9c (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/drivers/video/vt8500lcdfb.c
 *
 *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
 *
 * Based on skeletonfb.c and pxafb.c
 */

#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/wait.h>
#include <video/of_display_timing.h>

#include "vt8500lcdfb.h"
#include "wmt_ge_rops.h"

#ifdef CONFIG_OF
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/memblock.h>
#endif


#define to_vt8500lcd_info(__info) container_of(__info, \
						struct vt8500lcd_info, fb)

static int vt8500lcd_set_par(struct fb_info *info)
{
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	int reg_bpp = 5; /* 16bpp */
	int i;
	unsigned long control0;

	if (!fbi)
		return -EINVAL;

	if (info->var.bits_per_pixel <= 8) {
		/* palettized */
		info->var.red.offset    = 0;
		info->var.red.length    = info->var.bits_per_pixel;
		info->var.red.msb_right = 0;

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

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

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

		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		info->fix.line_length = info->var.xres_virtual /
						(8/info->var.bits_per_pixel);
	} else {
		/* non-palettized */
		info->var.transp.offset = 0;
		info->var.transp.length = 0;
		info->var.transp.msb_right = 0;

		if (info->var.bits_per_pixel == 16) {
			/* RGB565 */
			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;
		} else {
			/* Equal depths per channel */
			info->var.red.offset = info->var.bits_per_pixel
							* 2 / 3;
			info->var.red.length = info->var.bits_per_pixel / 3;
			info->var.red.msb_right = 0;
			info->var.green.offset = info->var.bits_per_pixel / 3;
			info->var.green.length = info->var.bits_per_pixel / 3;
			info->var.green.msb_right = 0;
			info->var.blue.offset = 0;
			info->var.blue.length = info->var.bits_per_pixel / 3;
			info->var.blue.msb_right = 0;
		}

		info->fix.visual = FB_VISUAL_TRUECOLOR;
		info->fix.line_length = info->var.bits_per_pixel > 16 ?
					info->var.xres_virtual << 2 :
					info->var.xres_virtual << 1;
	}

	for (i = 0; i < 8; i++) {
		if (bpp_values[i] == info->var.bits_per_pixel)
			reg_bpp = i;
	}

	control0 = readl(fbi->regbase) & ~0xf;
	writel(0, fbi->regbase);
	while (readl(fbi->regbase + 0x38) & 0x10)
		/* wait */;
	writel((((info->var.hsync_len - 1) & 0x3f) << 26)
		| ((info->var.left_margin & 0xff) << 18)
		| (((info->var.xres - 1) & 0x3ff) << 8)
		| (info->var.right_margin & 0xff), fbi->regbase + 0x4);
	writel((((info->var.vsync_len - 1) & 0x3f) << 26)
		| ((info->var.upper_margin & 0xff) << 18)
		| (((info->var.yres - 1) & 0x3ff) << 8)
		| (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
	writel((((info->var.yres - 1) & 0x400) << 2)
		| ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
	writel(0x80000000, fbi->regbase + 0x20);
	writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);

	return 0;
}

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

static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
			   unsigned blue, unsigned transp,
			   struct fb_info *info) {
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
	int ret = 1;
	unsigned int val;
	if (regno >= 256)
		return -EINVAL;

	if (info->var.grayscale)
		red = green = blue =
			(19595 * red + 38470 * green + 7471 * blue) >> 16;

	switch (fbi->fb.fix.visual) {
	case FB_VISUAL_TRUECOLOR:
		if (regno < 16) {
			u32 *pal = fbi->fb.pseudo_palette;

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

			pal[regno] = val;
			ret = 0;
		}
		break;

	case FB_VISUAL_STATIC_PSEUDOCOLOR:
	case FB_VISUAL_PSEUDOCOLOR:
		writew((red & 0xf800)
		      | ((green >> 5) & 0x7e0)
		      | ((blue >> 11) & 0x1f),
		       fbi->palette_cpu + sizeof(u16) * regno);
		break;
	}

	return ret;
}

static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
			 unsigned long arg)
{
	int ret = 0;
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);

	if (cmd == FBIO_WAITFORVSYNC) {
		/* Unmask End of Frame interrupt */
		writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
		ret = wait_event_interruptible_timeout(fbi->wait,
			readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
		/* Mask back to reduce unwanted interrupt traffic */
		writel(0xffffffff, fbi->regbase + 0x3c);
		if (ret < 0)
			return ret;
		if (ret == 0)
			return -ETIMEDOUT;
	}

	return ret;
}

static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
				struct fb_info *info)
{
	unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
	unsigned off = pixlen * var->xoffset
		      + info->fix.line_length * var->yoffset;
	struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);

	writel((1 << 31)
	     | (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
	     | (off >> 2), fbi->regbase + 0x20);
	return 0;
}

/*
 * vt8500lcd_blank():
 *	Blank the display by setting all palette values to zero.  Note,
 * 	True Color modes do not really use the palette, so this will not
 *      blank the display in all modes.
 */
static int vt8500lcd_blank(int blank, struct fb_info *info)
{
	int i;

	switch (blank) {
	case FB_BLANK_POWERDOWN:
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
	case FB_BLANK_NORMAL:
		if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
		    info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
			for (i = 0; i < 256; i++)
				vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
	case FB_BLANK_UNBLANK:
		if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
		    info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
			fb_set_cmap(&info->cmap, info);
	}
	return 0;
}

static struct fb_ops vt8500lcd_ops = {
	.owner		= THIS_MODULE,
	.fb_set_par	= vt8500lcd_set_par,
	.fb_setcolreg	= vt8500lcd_setcolreg,
	.fb_fillrect	= wmt_ge_fillrect,
	.fb_copyarea	= wmt_ge_copyarea,
	.fb_imageblit	= sys_imageblit,
	.fb_sync	= wmt_ge_sync,
	.fb_ioctl	= vt8500lcd_ioctl,
	.fb_pan_display	= vt8500lcd_pan_display,
	.fb_blank	= vt8500lcd_blank,
};

static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
{
	struct vt8500lcd_info *fbi = dev_id;

	if (readl(fbi->regbase + 0x38) & (1 << 3))
		wake_up_interruptible(&fbi->wait);

	writel(0xffffffff, fbi->regbase + 0x38);
	return IRQ_HANDLED;
}

static int vt8500lcd_probe(struct platform_device *pdev)
{
	struct vt8500lcd_info *fbi;
	struct resource *res;
	struct display_timings *disp_timing;
	void *addr;
	int irq, ret;

	struct fb_videomode	of_mode;
	u32			bpp;
	dma_addr_t fb_mem_phys;
	unsigned long fb_mem_len;
	void *fb_mem_virt;

	ret = -ENOMEM;
	fbi = NULL;

	fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
			+ sizeof(u32) * 16, GFP_KERNEL);
	if (!fbi)
		return -ENOMEM;

	strcpy(fbi->fb.fix.id, "VT8500 LCD");

	fbi->fb.fix.type	= FB_TYPE_PACKED_PIXELS;
	fbi->fb.fix.xpanstep	= 0;
	fbi->fb.fix.ypanstep	= 1;
	fbi->fb.fix.ywrapstep	= 0;
	fbi->fb.fix.accel	= FB_ACCEL_NONE;

	fbi->fb.var.nonstd	= 0;
	fbi->fb.var.activate	= FB_ACTIVATE_NOW;
	fbi->fb.var.height	= -1;
	fbi->fb.var.width	= -1;
	fbi->fb.var.vmode	= FB_VMODE_NONINTERLACED;

	fbi->fb.fbops		= &vt8500lcd_ops;
	fbi->fb.flags		= FBINFO_DEFAULT
				| FBINFO_HWACCEL_COPYAREA
				| FBINFO_HWACCEL_FILLRECT
				| FBINFO_HWACCEL_YPAN
				| FBINFO_VIRTFB
				| FBINFO_PARTIAL_PAN_OK;
	fbi->fb.node		= -1;

	addr = fbi;
	addr = addr + sizeof(struct vt8500lcd_info);
	fbi->fb.pseudo_palette	= addr;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "no I/O memory resource defined\n");
		return -ENODEV;
	}

	res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
	if (res == NULL) {
		dev_err(&pdev->dev, "failed to request I/O memory\n");
		return -EBUSY;
	}

	fbi->regbase = ioremap(res->start, resource_size(res));
	if (fbi->regbase == NULL) {
		dev_err(&pdev->dev, "failed to map I/O memory\n");
		ret = -EBUSY;
		goto failed_free_res;
	}

	disp_timing = of_get_display_timings(pdev->dev.of_node);
	if (!disp_timing) {
		ret = -EINVAL;
		goto failed_free_io;
	}

	ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode,
							OF_USE_NATIVE_MODE);
	if (ret)
		goto failed_free_io;

	ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
	if (ret)
		goto failed_free_io;

	/* try allocating the framebuffer */
	fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
	fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
				GFP_KERNEL);
	if (!fb_mem_virt) {
		pr_err("%s: Failed to allocate framebuffer\n", __func__);
		ret = -ENOMEM;
		goto failed_free_io;
	}

	fbi->fb.fix.smem_start	= fb_mem_phys;
	fbi->fb.fix.smem_len	= fb_mem_len;
	fbi->fb.screen_base	= fb_mem_virt;

	fbi->palette_size	= PAGE_ALIGN(512);
	fbi->palette_cpu	= dma_alloc_coherent(&pdev->dev,
						     fbi->palette_size,
						     &fbi->palette_phys,
						     GFP_KERNEL);
	if (fbi->palette_cpu == NULL) {
		dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
		ret = -ENOMEM;
		goto failed_free_io;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "no IRQ defined\n");
		ret = -ENODEV;
		goto failed_free_palette;
	}

	ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
	if (ret) {
		dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
		ret = -EBUSY;
		goto failed_free_palette;
	}

	init_waitqueue_head(&fbi->wait);

	if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
		dev_err(&pdev->dev, "Failed to allocate color map\n");
		ret = -ENOMEM;
		goto failed_free_irq;
	}

	fb_videomode_to_var(&fbi->fb.var, &of_mode);

	fbi->fb.var.xres_virtual	= of_mode.xres;
	fbi->fb.var.yres_virtual	= of_mode.yres * 2;
	fbi->fb.var.bits_per_pixel	= bpp;

	ret = vt8500lcd_set_par(&fbi->fb);
	if (ret) {
		dev_err(&pdev->dev, "Failed to set parameters\n");
		goto failed_free_cmap;
	}

	writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
	writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);

	platform_set_drvdata(pdev, fbi);

	ret = register_framebuffer(&fbi->fb);
	if (ret < 0) {
		dev_err(&pdev->dev,
			"Failed to register framebuffer device: %d\n", ret);
		goto failed_free_cmap;
	}

	/*
	 * Ok, now enable the LCD controller
	 */
	writel(readl(fbi->regbase) | 1, fbi->regbase);

	return 0;

failed_free_cmap:
	if (fbi->fb.cmap.len)
		fb_dealloc_cmap(&fbi->fb.cmap);
failed_free_irq:
	free_irq(irq, fbi);
failed_free_palette:
	dma_free_coherent(&pdev->dev, fbi->palette_size,
			  fbi->palette_cpu, fbi->palette_phys);
failed_free_io:
	iounmap(fbi->regbase);
failed_free_res:
	release_mem_region(res->start, resource_size(res));
	return ret;
}

static int vt8500lcd_remove(struct platform_device *pdev)
{
	struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
	struct resource *res;
	int irq;

	unregister_framebuffer(&fbi->fb);

	writel(0, fbi->regbase);

	if (fbi->fb.cmap.len)
		fb_dealloc_cmap(&fbi->fb.cmap);

	irq = platform_get_irq(pdev, 0);
	free_irq(irq, fbi);

	dma_free_coherent(&pdev->dev, fbi->palette_size,
			  fbi->palette_cpu, fbi->palette_phys);

	iounmap(fbi->regbase);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, resource_size(res));

	return 0;
}

static const struct of_device_id via_dt_ids[] = {
	{ .compatible = "via,vt8500-fb", },
	{}
};

static struct platform_driver vt8500lcd_driver = {
	.probe		= vt8500lcd_probe,
	.remove		= vt8500lcd_remove,
	.driver		= {
		.name	= "vt8500-lcd",
		.of_match_table = of_match_ptr(via_dt_ids),
	},
};

module_platform_driver(vt8500lcd_driver);

MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(of, via_dt_ids);