summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/pl111/pl111_versatile.c
blob: 1b436b75fd396f2bf71ab067a873873ccd484fd5 (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
// SPDX-License-Identifier: GPL-2.0-only

/*
 * Versatile family (ARM reference designs) handling for the PL11x.
 * This is based on code and know-how in the previous frame buffer
 * driver in drivers/video/fbdev/amba-clcd.c:
 * Copyright (C) 2001 ARM Limited, by David A Rusling
 * Updated to 2.5 by Deep Blue Solutions Ltd.
 * Major contributions and discoveries by Russell King.
 */

#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/vexpress.h>

#include <drm/drm_fourcc.h>

#include "pl111_versatile.h"
#include "pl111_drm.h"

static struct regmap *versatile_syscon_map;

/*
 * We detect the different syscon types from the compatible strings.
 */
enum versatile_clcd {
	INTEGRATOR_IMPD1,
	INTEGRATOR_CLCD_CM,
	VERSATILE_CLCD,
	REALVIEW_CLCD_EB,
	REALVIEW_CLCD_PB1176,
	REALVIEW_CLCD_PB11MP,
	REALVIEW_CLCD_PBA8,
	REALVIEW_CLCD_PBX,
	VEXPRESS_CLCD_V2M,
};

static const struct of_device_id versatile_clcd_of_match[] = {
	{
		.compatible = "arm,core-module-integrator",
		.data = (void *)INTEGRATOR_CLCD_CM,
	},
	{
		.compatible = "arm,versatile-sysreg",
		.data = (void *)VERSATILE_CLCD,
	},
	{
		.compatible = "arm,realview-eb-syscon",
		.data = (void *)REALVIEW_CLCD_EB,
	},
	{
		.compatible = "arm,realview-pb1176-syscon",
		.data = (void *)REALVIEW_CLCD_PB1176,
	},
	{
		.compatible = "arm,realview-pb11mp-syscon",
		.data = (void *)REALVIEW_CLCD_PB11MP,
	},
	{
		.compatible = "arm,realview-pba8-syscon",
		.data = (void *)REALVIEW_CLCD_PBA8,
	},
	{
		.compatible = "arm,realview-pbx-syscon",
		.data = (void *)REALVIEW_CLCD_PBX,
	},
	{
		.compatible = "arm,vexpress-muxfpga",
		.data = (void *)VEXPRESS_CLCD_V2M,
	},
	{},
};

static const struct of_device_id impd1_clcd_of_match[] = {
	{
		.compatible = "arm,im-pd1-syscon",
		.data = (void *)INTEGRATOR_IMPD1,
	},
	{},
};

/*
 * Core module CLCD control on the Integrator/CP, bits
 * 8 thru 19 of the CM_CONTROL register controls a bunch
 * of CLCD settings.
 */
#define INTEGRATOR_HDR_CTRL_OFFSET	0x0C
#define INTEGRATOR_CLCD_LCDBIASEN	BIT(8)
#define INTEGRATOR_CLCD_LCDBIASUP	BIT(9)
#define INTEGRATOR_CLCD_LCDBIASDN	BIT(10)
/* Bits 11,12,13 controls the LCD or VGA bridge type */
#define INTEGRATOR_CLCD_LCDMUX_LCD24	BIT(11)
#define INTEGRATOR_CLCD_LCDMUX_SHARP	(BIT(11)|BIT(12))
#define INTEGRATOR_CLCD_LCDMUX_VGA555	BIT(13)
#define INTEGRATOR_CLCD_LCDMUX_VGA24	(BIT(11)|BIT(12)|BIT(13))
#define INTEGRATOR_CLCD_LCD0_EN		BIT(14)
#define INTEGRATOR_CLCD_LCD1_EN		BIT(15)
/* R/L flip on Sharp */
#define INTEGRATOR_CLCD_LCD_STATIC1	BIT(16)
/* U/D flip on Sharp */
#define INTEGRATOR_CLCD_LCD_STATIC2	BIT(17)
/* No connection on Sharp */
#define INTEGRATOR_CLCD_LCD_STATIC	BIT(18)
/* 0 = 24bit VGA, 1 = 18bit VGA */
#define INTEGRATOR_CLCD_LCD_N24BITEN	BIT(19)

#define INTEGRATOR_CLCD_MASK		GENMASK(19, 8)

static void pl111_integrator_enable(struct drm_device *drm, u32 format)
{
	u32 val;

	dev_info(drm->dev, "enable Integrator CLCD connectors\n");

	/* FIXME: really needed? */
	val = INTEGRATOR_CLCD_LCD_STATIC1 | INTEGRATOR_CLCD_LCD_STATIC2 |
		INTEGRATOR_CLCD_LCD0_EN | INTEGRATOR_CLCD_LCD1_EN;

	switch (format) {
	case DRM_FORMAT_XBGR8888:
	case DRM_FORMAT_XRGB8888:
		/* 24bit formats */
		val |= INTEGRATOR_CLCD_LCDMUX_VGA24;
		break;
	case DRM_FORMAT_XBGR1555:
	case DRM_FORMAT_XRGB1555:
		/* Pseudocolor, RGB555, BGR555 */
		val |= INTEGRATOR_CLCD_LCDMUX_VGA555;
		break;
	default:
		dev_err(drm->dev, "unhandled format on Integrator 0x%08x\n",
			format);
		break;
	}

	regmap_update_bits(versatile_syscon_map,
			   INTEGRATOR_HDR_CTRL_OFFSET,
			   INTEGRATOR_CLCD_MASK,
			   val);
}

#define IMPD1_CTRL_OFFSET	0x18
#define IMPD1_CTRL_DISP_LCD	(0 << 0)
#define IMPD1_CTRL_DISP_VGA	(1 << 0)
#define IMPD1_CTRL_DISP_LCD1	(2 << 0)
#define IMPD1_CTRL_DISP_ENABLE	(1 << 2)
#define IMPD1_CTRL_DISP_MASK	(7 << 0)

static void pl111_impd1_enable(struct drm_device *drm, u32 format)
{
	u32 val;

	dev_info(drm->dev, "enable IM-PD1 CLCD connectors\n");
	val = IMPD1_CTRL_DISP_VGA | IMPD1_CTRL_DISP_ENABLE;

	regmap_update_bits(versatile_syscon_map,
			   IMPD1_CTRL_OFFSET,
			   IMPD1_CTRL_DISP_MASK,
			   val);
}

static void pl111_impd1_disable(struct drm_device *drm)
{
	dev_info(drm->dev, "disable IM-PD1 CLCD connectors\n");

	regmap_update_bits(versatile_syscon_map,
			   IMPD1_CTRL_OFFSET,
			   IMPD1_CTRL_DISP_MASK,
			   0);
}

/*
 * This configuration register in the Versatile and RealView
 * family is uniformly present but appears more and more
 * unutilized starting with the RealView series.
 */
#define SYS_CLCD			0x50
#define SYS_CLCD_MODE_MASK		(BIT(0)|BIT(1))
#define SYS_CLCD_MODE_888		0
#define SYS_CLCD_MODE_5551		BIT(0)
#define SYS_CLCD_MODE_565_R_LSB		BIT(1)
#define SYS_CLCD_MODE_565_B_LSB		(BIT(0)|BIT(1))
#define SYS_CLCD_CONNECTOR_MASK		(BIT(2)|BIT(3)|BIT(4)|BIT(5))
#define SYS_CLCD_NLCDIOON		BIT(2)
#define SYS_CLCD_VDDPOSSWITCH		BIT(3)
#define SYS_CLCD_PWR3V5SWITCH		BIT(4)
#define SYS_CLCD_VDDNEGSWITCH		BIT(5)

static void pl111_versatile_disable(struct drm_device *drm)
{
	dev_info(drm->dev, "disable Versatile CLCD connectors\n");
	regmap_update_bits(versatile_syscon_map,
			   SYS_CLCD,
			   SYS_CLCD_CONNECTOR_MASK,
			   0);
}

static void pl111_versatile_enable(struct drm_device *drm, u32 format)
{
	u32 val = 0;

	dev_info(drm->dev, "enable Versatile CLCD connectors\n");

	switch (format) {
	case DRM_FORMAT_ABGR8888:
	case DRM_FORMAT_XBGR8888:
	case DRM_FORMAT_ARGB8888:
	case DRM_FORMAT_XRGB8888:
		val |= SYS_CLCD_MODE_888;
		break;
	case DRM_FORMAT_BGR565:
		val |= SYS_CLCD_MODE_565_R_LSB;
		break;
	case DRM_FORMAT_RGB565:
		val |= SYS_CLCD_MODE_565_B_LSB;
		break;
	case DRM_FORMAT_ABGR1555:
	case DRM_FORMAT_XBGR1555:
	case DRM_FORMAT_ARGB1555:
	case DRM_FORMAT_XRGB1555:
		val |= SYS_CLCD_MODE_5551;
		break;
	default:
		dev_err(drm->dev, "unhandled format on Versatile 0x%08x\n",
			format);
		break;
	}

	/* Set up the MUX */
	regmap_update_bits(versatile_syscon_map,
			   SYS_CLCD,
			   SYS_CLCD_MODE_MASK,
			   val);

	/* Then enable the display */
	regmap_update_bits(versatile_syscon_map,
			   SYS_CLCD,
			   SYS_CLCD_CONNECTOR_MASK,
			   SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
}

static void pl111_realview_clcd_disable(struct drm_device *drm)
{
	dev_info(drm->dev, "disable RealView CLCD connectors\n");
	regmap_update_bits(versatile_syscon_map,
			   SYS_CLCD,
			   SYS_CLCD_CONNECTOR_MASK,
			   0);
}

static void pl111_realview_clcd_enable(struct drm_device *drm, u32 format)
{
	dev_info(drm->dev, "enable RealView CLCD connectors\n");
	regmap_update_bits(versatile_syscon_map,
			   SYS_CLCD,
			   SYS_CLCD_CONNECTOR_MASK,
			   SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
}

/* PL110 pixel formats for Integrator, vanilla PL110 */
static const u32 pl110_integrator_pixel_formats[] = {
	DRM_FORMAT_ABGR8888,
	DRM_FORMAT_XBGR8888,
	DRM_FORMAT_ARGB8888,
	DRM_FORMAT_XRGB8888,
	DRM_FORMAT_ABGR1555,
	DRM_FORMAT_XBGR1555,
	DRM_FORMAT_ARGB1555,
	DRM_FORMAT_XRGB1555,
};

/* Extended PL110 pixel formats for Integrator and Versatile */
static const u32 pl110_versatile_pixel_formats[] = {
	DRM_FORMAT_ABGR8888,
	DRM_FORMAT_XBGR8888,
	DRM_FORMAT_ARGB8888,
	DRM_FORMAT_XRGB8888,
	DRM_FORMAT_BGR565, /* Uses external PLD */
	DRM_FORMAT_RGB565, /* Uses external PLD */
	DRM_FORMAT_ABGR1555,
	DRM_FORMAT_XBGR1555,
	DRM_FORMAT_ARGB1555,
	DRM_FORMAT_XRGB1555,
};

static const u32 pl111_realview_pixel_formats[] = {
	DRM_FORMAT_ABGR8888,
	DRM_FORMAT_XBGR8888,
	DRM_FORMAT_ARGB8888,
	DRM_FORMAT_XRGB8888,
	DRM_FORMAT_BGR565,
	DRM_FORMAT_RGB565,
	DRM_FORMAT_ABGR1555,
	DRM_FORMAT_XBGR1555,
	DRM_FORMAT_ARGB1555,
	DRM_FORMAT_XRGB1555,
	DRM_FORMAT_ABGR4444,
	DRM_FORMAT_XBGR4444,
	DRM_FORMAT_ARGB4444,
	DRM_FORMAT_XRGB4444,
};

/*
 * The Integrator variant is a PL110 with a bunch of broken, or not
 * yet implemented features
 */
static const struct pl111_variant_data pl110_integrator = {
	.name = "PL110 Integrator",
	.is_pl110 = true,
	.broken_clockdivider = true,
	.broken_vblank = true,
	.formats = pl110_integrator_pixel_formats,
	.nformats = ARRAY_SIZE(pl110_integrator_pixel_formats),
	.fb_bpp = 16,
};

/*
 * The IM-PD1 variant is a PL110 with a bunch of broken, or not
 * yet implemented features
 */
static const struct pl111_variant_data pl110_impd1 = {
	.name = "PL110 IM-PD1",
	.is_pl110 = true,
	.broken_clockdivider = true,
	.broken_vblank = true,
	.formats = pl110_integrator_pixel_formats,
	.nformats = ARRAY_SIZE(pl110_integrator_pixel_formats),
	.fb_bpp = 16,
};

/*
 * This is the in-between PL110 variant found in the ARM Versatile,
 * supporting RGB565/BGR565
 */
static const struct pl111_variant_data pl110_versatile = {
	.name = "PL110 Versatile",
	.is_pl110 = true,
	.external_bgr = true,
	.formats = pl110_versatile_pixel_formats,
	.nformats = ARRAY_SIZE(pl110_versatile_pixel_formats),
	.fb_bpp = 16,
};

/*
 * RealView PL111 variant, the only real difference from the vanilla
 * PL111 is that we select 16bpp framebuffer by default to be able
 * to get 1024x768 without saturating the memory bus.
 */
static const struct pl111_variant_data pl111_realview = {
	.name = "PL111 RealView",
	.formats = pl111_realview_pixel_formats,
	.nformats = ARRAY_SIZE(pl111_realview_pixel_formats),
	.fb_bpp = 16,
};

/*
 * Versatile Express PL111 variant, again we just push the maximum
 * BPP to 16 to be able to get 1024x768 without saturating the memory
 * bus. The clockdivider also seems broken on the Versatile Express.
 */
static const struct pl111_variant_data pl111_vexpress = {
	.name = "PL111 Versatile Express",
	.formats = pl111_realview_pixel_formats,
	.nformats = ARRAY_SIZE(pl111_realview_pixel_formats),
	.fb_bpp = 16,
	.broken_clockdivider = true,
};

#define VEXPRESS_FPGAMUX_MOTHERBOARD		0x00
#define VEXPRESS_FPGAMUX_DAUGHTERBOARD_1	0x01
#define VEXPRESS_FPGAMUX_DAUGHTERBOARD_2	0x02

static int pl111_vexpress_clcd_init(struct device *dev, struct device_node *np,
				    struct pl111_drm_dev_private *priv)
{
	struct platform_device *pdev;
	struct device_node *root;
	struct device_node *child;
	struct device_node *ct_clcd = NULL;
	struct regmap *map;
	bool has_coretile_clcd = false;
	bool has_coretile_hdlcd = false;
	bool mux_motherboard = true;
	u32 val;
	int ret;

	if (!IS_ENABLED(CONFIG_VEXPRESS_CONFIG))
		return -ENODEV;

	/*
	 * Check if we have a CLCD or HDLCD on the core tile by checking if a
	 * CLCD or HDLCD is available in the root of the device tree.
	 */
	root = of_find_node_by_path("/");
	if (!root)
		return -EINVAL;

	for_each_available_child_of_node(root, child) {
		if (of_device_is_compatible(child, "arm,pl111")) {
			has_coretile_clcd = true;
			ct_clcd = child;
			of_node_put(child);
			break;
		}
		if (of_device_is_compatible(child, "arm,hdlcd")) {
			has_coretile_hdlcd = true;
			of_node_put(child);
			break;
		}
	}

	of_node_put(root);

	/*
	 * If there is a coretile HDLCD and it has a driver,
	 * do not mux the CLCD on the motherboard to the DVI.
	 */
	if (has_coretile_hdlcd && IS_ENABLED(CONFIG_DRM_HDLCD))
		mux_motherboard = false;

	/*
	 * On the Vexpress CA9 we let the CLCD on the coretile
	 * take precedence, so also in this case do not mux the
	 * motherboard to the DVI.
	 */
	if (has_coretile_clcd)
		mux_motherboard = false;

	if (mux_motherboard) {
		dev_info(dev, "DVI muxed to motherboard CLCD\n");
		val = VEXPRESS_FPGAMUX_MOTHERBOARD;
	} else if (ct_clcd == dev->of_node) {
		dev_info(dev,
			 "DVI muxed to daughterboard 1 (core tile) CLCD\n");
		val = VEXPRESS_FPGAMUX_DAUGHTERBOARD_1;
	} else {
		dev_info(dev, "core tile graphics present\n");
		dev_info(dev, "this device will be deactivated\n");
		return -ENODEV;
	}

	/* Call into deep Vexpress configuration API */
	pdev = of_find_device_by_node(np);
	if (!pdev) {
		dev_err(dev, "can't find the sysreg device, deferring\n");
		return -EPROBE_DEFER;
	}

	map = devm_regmap_init_vexpress_config(&pdev->dev);
	if (IS_ERR(map)) {
		platform_device_put(pdev);
		return PTR_ERR(map);
	}

	ret = regmap_write(map, 0, val);
	platform_device_put(pdev);
	if (ret) {
		dev_err(dev, "error setting DVI muxmode\n");
		return -ENODEV;
	}

	priv->variant = &pl111_vexpress;
	dev_info(dev, "initializing Versatile Express PL111\n");

	return 0;
}

int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
{
	const struct of_device_id *clcd_id;
	enum versatile_clcd versatile_clcd_type;
	struct device_node *np;
	struct regmap *map;

	np = of_find_matching_node_and_match(NULL, versatile_clcd_of_match,
					     &clcd_id);
	if (!np) {
		/* Non-ARM reference designs, just bail out */
		return 0;
	}

	versatile_clcd_type = (enum versatile_clcd)clcd_id->data;

	/* Versatile Express special handling */
	if (versatile_clcd_type == VEXPRESS_CLCD_V2M) {
		int ret = pl111_vexpress_clcd_init(dev, np, priv);
		of_node_put(np);
		if (ret)
			dev_err(dev, "Versatile Express init failed - %d", ret);
		return ret;
	}

	/*
	 * On the Integrator, check if we should use the IM-PD1 instead,
	 * if we find it, it will take precedence. This is on the Integrator/AP
	 * which only has this option for PL110 graphics.
	 */
	 if (versatile_clcd_type == INTEGRATOR_CLCD_CM) {
		np = of_find_matching_node_and_match(NULL, impd1_clcd_of_match,
						     &clcd_id);
		if (np)
			versatile_clcd_type = (enum versatile_clcd)clcd_id->data;
	}

	map = syscon_node_to_regmap(np);
	of_node_put(np);
	if (IS_ERR(map)) {
		dev_err(dev, "no Versatile syscon regmap\n");
		return PTR_ERR(map);
	}

	switch (versatile_clcd_type) {
	case INTEGRATOR_CLCD_CM:
		versatile_syscon_map = map;
		priv->variant = &pl110_integrator;
		priv->variant_display_enable = pl111_integrator_enable;
		dev_info(dev, "set up callbacks for Integrator PL110\n");
		break;
	case INTEGRATOR_IMPD1:
		versatile_syscon_map = map;
		priv->variant = &pl110_impd1;
		priv->variant_display_enable = pl111_impd1_enable;
		priv->variant_display_disable = pl111_impd1_disable;
		dev_info(dev, "set up callbacks for IM-PD1 PL110\n");
		break;
	case VERSATILE_CLCD:
		versatile_syscon_map = map;
		/* This can do RGB565 with external PLD */
		priv->variant = &pl110_versatile;
		priv->variant_display_enable = pl111_versatile_enable;
		priv->variant_display_disable = pl111_versatile_disable;
		/*
		 * The Versatile has a variant halfway between PL110
		 * and PL111 where these two registers have already been
		 * swapped.
		 */
		priv->ienb = CLCD_PL111_IENB;
		priv->ctrl = CLCD_PL111_CNTL;
		dev_info(dev, "set up callbacks for Versatile PL110\n");
		break;
	case REALVIEW_CLCD_EB:
	case REALVIEW_CLCD_PB1176:
	case REALVIEW_CLCD_PB11MP:
	case REALVIEW_CLCD_PBA8:
	case REALVIEW_CLCD_PBX:
		versatile_syscon_map = map;
		priv->variant = &pl111_realview;
		priv->variant_display_enable = pl111_realview_clcd_enable;
		priv->variant_display_disable = pl111_realview_clcd_disable;
		dev_info(dev, "set up callbacks for RealView PL111\n");
		break;
	default:
		dev_info(dev, "unknown Versatile system controller\n");
		break;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(pl111_versatile_init);