summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/pl111/pl111_drv.c
blob: 47fe3022344426c6fa1dea4ae06e534bfff74faa (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
/*
 * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
 *
 * Parts of this file were based on sources as follows:
 *
 * Copyright (c) 2006-2008 Intel Corporation
 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
 * Copyright (C) 2011 Texas Instruments
 *
 * This program is free software and is provided to you under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation, and any use by you of this program is subject to the terms of
 * such GNU licence.
 *
 */

/**
 * DOC: ARM PrimeCell PL111 CLCD Driver
 *
 * The PL111 is a simple LCD controller that can support TFT and STN
 * displays.  This driver exposes a standard KMS interface for them.
 *
 * This driver uses the same Device Tree binding as the fbdev CLCD
 * driver.  While the fbdev driver supports panels that may be
 * connected to the CLCD internally to the CLCD driver, in DRM the
 * panels get split out to drivers/gpu/drm/panels/.  This means that,
 * in converting from using fbdev to using DRM, you also need to write
 * a panel driver (which may be as simple as an entry in
 * panel-simple.c).
 *
 * The driver currently doesn't expose the cursor.  The DRM API for
 * cursors requires support for 64x64 ARGB8888 cursor images, while
 * the hardware can only support 64x64 monochrome with masking
 * cursors.  While one could imagine trying to hack something together
 * to look at the ARGB8888 and program reasonable in monochrome, we
 * just don't expose the cursor at all instead, and leave cursor
 * support to the X11 software cursor layer.
 *
 * TODO:
 *
 * - Fix race between setting plane base address and getting IRQ for
 *   vsync firing the pageflip completion.
 *
 * - Use the "max-memory-bandwidth" DT property to filter the
 *   supported formats.
 *
 * - Read back hardware state at boot to skip reprogramming the
 *   hardware when doing a no-op modeset.
 *
 * - Use the CLKSEL bit to support switching between the two external
 *   clock parents.
 */

#include <linux/amba/bus.h>
#include <linux/amba/clcd-regs.h>
#include <linux/version.h>
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>

#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_bridge.h>
#include <drm/drm_panel.h>

#include "pl111_drm.h"
#include "pl111_versatile.h"
#include "pl111_nomadik.h"

#define DRIVER_DESC      "DRM module for PL111"

static const struct drm_mode_config_funcs mode_config_funcs = {
	.fb_create = drm_gem_fb_create,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
};

static int pl111_modeset_init(struct drm_device *dev)
{
	struct drm_mode_config *mode_config;
	struct pl111_drm_dev_private *priv = dev->dev_private;
	struct device_node *np = dev->dev->of_node;
	struct device_node *remote;
	struct drm_panel *panel = NULL;
	struct drm_bridge *bridge = NULL;
	bool defer = false;
	int ret = 0;
	int i;

	drm_mode_config_init(dev);
	mode_config = &dev->mode_config;
	mode_config->funcs = &mode_config_funcs;
	mode_config->min_width = 1;
	mode_config->max_width = 1024;
	mode_config->min_height = 1;
	mode_config->max_height = 768;

	i = 0;
	for_each_endpoint_of_node(np, remote) {
		struct drm_panel *tmp_panel;
		struct drm_bridge *tmp_bridge;

		dev_dbg(dev->dev, "checking endpoint %d\n", i);

		ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
						  0, i,
						  &tmp_panel,
						  &tmp_bridge);
		if (ret) {
			if (ret == -EPROBE_DEFER) {
				/*
				 * Something deferred, but that is often just
				 * another way of saying -ENODEV, but let's
				 * cast a vote for later deferral.
				 */
				defer = true;
			} else if (ret != -ENODEV) {
				/* Continue, maybe something else is working */
				dev_err(dev->dev,
					"endpoint %d returns %d\n", i, ret);
			}
		}

		if (tmp_panel) {
			dev_info(dev->dev,
				 "found panel on endpoint %d\n", i);
			panel = tmp_panel;
		}
		if (tmp_bridge) {
			dev_info(dev->dev,
				 "found bridge on endpoint %d\n", i);
			bridge = tmp_bridge;
		}

		i++;
	}

	/*
	 * If we can't find neither panel nor bridge on any of the
	 * endpoints, and any of them retured -EPROBE_DEFER, then
	 * let's defer this driver too.
	 */
	if ((!panel && !bridge) && defer)
		return -EPROBE_DEFER;

	if (panel) {
		bridge = drm_panel_bridge_add(panel,
					      DRM_MODE_CONNECTOR_Unknown);
		if (IS_ERR(bridge)) {
			ret = PTR_ERR(bridge);
			goto out_config;
		}
	} else if (bridge) {
		dev_info(dev->dev, "Using non-panel bridge\n");
	} else {
		dev_err(dev->dev, "No bridge, exiting\n");
		return -ENODEV;
	}

	priv->bridge = bridge;
	if (panel) {
		priv->panel = panel;
		priv->connector = panel->connector;
	}

	ret = pl111_display_init(dev);
	if (ret != 0) {
		dev_err(dev->dev, "Failed to init display\n");
		goto out_bridge;
	}

	ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
						    bridge);
	if (ret)
		return ret;

	if (!priv->variant->broken_vblank) {
		ret = drm_vblank_init(dev, 1);
		if (ret != 0) {
			dev_err(dev->dev, "Failed to init vblank\n");
			goto out_bridge;
		}
	}

	drm_mode_config_reset(dev);

	drm_fb_cma_fbdev_init(dev, priv->variant->fb_bpp, 0);

	drm_kms_helper_poll_init(dev);

	goto finish;

out_bridge:
	if (panel)
		drm_panel_bridge_remove(bridge);
out_config:
	drm_mode_config_cleanup(dev);
finish:
	return ret;
}

static struct drm_gem_object *
pl111_gem_import_sg_table(struct drm_device *dev,
			  struct dma_buf_attachment *attach,
			  struct sg_table *sgt)
{
	struct pl111_drm_dev_private *priv = dev->dev_private;

	/*
	 * When using device-specific reserved memory we can't import
	 * DMA buffers: those are passed by reference in any global
	 * memory and we can only handle a specific range of memory.
	 */
	if (priv->use_device_memory)
		return ERR_PTR(-EINVAL);

	return drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
}

DEFINE_DRM_GEM_CMA_FOPS(drm_fops);

static struct drm_driver pl111_drm_driver = {
	.driver_features =
		DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
	.lastclose = drm_fb_helper_lastclose,
	.ioctls = NULL,
	.fops = &drm_fops,
	.name = "pl111",
	.desc = DRIVER_DESC,
	.date = "20170317",
	.major = 1,
	.minor = 0,
	.patchlevel = 0,
	.dumb_create = drm_gem_cma_dumb_create,
	.gem_free_object_unlocked = drm_gem_cma_free_object,
	.gem_vm_ops = &drm_gem_cma_vm_ops,
	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_prime_import = drm_gem_prime_import,
	.gem_prime_import_sg_table = pl111_gem_import_sg_table,
	.gem_prime_export = drm_gem_prime_export,
	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
	.gem_prime_mmap = drm_gem_cma_prime_mmap,
	.gem_prime_vmap = drm_gem_cma_prime_vmap,

#if defined(CONFIG_DEBUG_FS)
	.debugfs_init = pl111_debugfs_init,
#endif
};

static int pl111_amba_probe(struct amba_device *amba_dev,
			    const struct amba_id *id)
{
	struct device *dev = &amba_dev->dev;
	struct pl111_drm_dev_private *priv;
	const struct pl111_variant_data *variant = id->data;
	struct drm_device *drm;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	drm = drm_dev_alloc(&pl111_drm_driver, dev);
	if (IS_ERR(drm))
		return PTR_ERR(drm);
	amba_set_drvdata(amba_dev, drm);
	priv->drm = drm;
	drm->dev_private = priv;
	priv->variant = variant;

	ret = of_reserved_mem_device_init(dev);
	if (!ret) {
		dev_info(dev, "using device-specific reserved memory\n");
		priv->use_device_memory = true;
	}

	if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",
				 &priv->memory_bw)) {
		dev_info(dev, "no max memory bandwidth specified, assume unlimited\n");
		priv->memory_bw = 0;
	}

	/* The two main variants swap this register */
	if (variant->is_pl110 || variant->is_lcdc) {
		priv->ienb = CLCD_PL110_IENB;
		priv->ctrl = CLCD_PL110_CNTL;
	} else {
		priv->ienb = CLCD_PL111_IENB;
		priv->ctrl = CLCD_PL111_CNTL;
	}

	priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
	if (IS_ERR(priv->regs)) {
		dev_err(dev, "%s failed mmio\n", __func__);
		ret = PTR_ERR(priv->regs);
		goto dev_put;
	}

	/* This may override some variant settings */
	ret = pl111_versatile_init(dev, priv);
	if (ret)
		goto dev_put;

	pl111_nomadik_init(dev);

	/* turn off interrupts before requesting the irq */
	writel(0, priv->regs + priv->ienb);

	ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
			       variant->name, priv);
	if (ret != 0) {
		dev_err(dev, "%s failed irq %d\n", __func__, ret);
		return ret;
	}

	ret = pl111_modeset_init(drm);
	if (ret != 0)
		goto dev_put;

	ret = drm_dev_register(drm, 0);
	if (ret < 0)
		goto dev_put;

	return 0;

dev_put:
	drm_dev_put(drm);
	of_reserved_mem_device_release(dev);

	return ret;
}

static int pl111_amba_remove(struct amba_device *amba_dev)
{
	struct device *dev = &amba_dev->dev;
	struct drm_device *drm = amba_get_drvdata(amba_dev);
	struct pl111_drm_dev_private *priv = drm->dev_private;

	drm_dev_unregister(drm);
	drm_fb_cma_fbdev_fini(drm);
	if (priv->panel)
		drm_panel_bridge_remove(priv->bridge);
	drm_mode_config_cleanup(drm);
	drm_dev_put(drm);
	of_reserved_mem_device_release(dev);

	return 0;
}

/*
 * This early variant lacks the 565 and 444 pixel formats.
 */
static const u32 pl110_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,
};

static const struct pl111_variant_data pl110_variant = {
	.name = "PL110",
	.is_pl110 = true,
	.formats = pl110_pixel_formats,
	.nformats = ARRAY_SIZE(pl110_pixel_formats),
	.fb_bpp = 16,
};

/* RealView, Versatile Express etc use this modern variant */
static const u32 pl111_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,
};

static const struct pl111_variant_data pl111_variant = {
	.name = "PL111",
	.formats = pl111_pixel_formats,
	.nformats = ARRAY_SIZE(pl111_pixel_formats),
	.fb_bpp = 32,
};

static const u32 pl110_nomadik_pixel_formats[] = {
	DRM_FORMAT_RGB888,
	DRM_FORMAT_BGR888,
	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,
};

static const struct pl111_variant_data pl110_nomadik_variant = {
	.name = "LCDC (PL110 Nomadik)",
	.formats = pl110_nomadik_pixel_formats,
	.nformats = ARRAY_SIZE(pl110_nomadik_pixel_formats),
	.is_lcdc = true,
	.st_bitmux_control = true,
	.broken_vblank = true,
	.fb_bpp = 16,
};

static const struct amba_id pl111_id_table[] = {
	{
		.id = 0x00041110,
		.mask = 0x000fffff,
		.data = (void *)&pl110_variant,
	},
	{
		.id = 0x00180110,
		.mask = 0x00fffffe,
		.data = (void *)&pl110_nomadik_variant,
	},
	{
		.id = 0x00041111,
		.mask = 0x000fffff,
		.data = (void *)&pl111_variant,
	},
	{0, 0},
};

static struct amba_driver pl111_amba_driver __maybe_unused = {
	.drv = {
		.name = "drm-clcd-pl111",
	},
	.probe = pl111_amba_probe,
	.remove = pl111_amba_remove,
	.id_table = pl111_id_table,
};

#ifdef CONFIG_ARM_AMBA
module_amba_driver(pl111_amba_driver);
#endif

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("ARM Ltd.");
MODULE_LICENSE("GPL");