summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/sun4i/sun4i_drv.c
blob: 4570da0227b4e49523b7f9c697fce54777dacd7e (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
/*
 * Copyright (C) 2015 Free Electrons
 * Copyright (C) 2015 NextThing Co
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 */

#include <linux/component.h>
#include <linux/kfifo.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_of.h>

#include "sun4i_drv.h"
#include "sun4i_framebuffer.h"
#include "sun4i_tcon.h"

DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);

static struct drm_driver sun4i_drv_driver = {
	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,

	/* Generic Operations */
	.lastclose		= drm_fb_helper_lastclose,
	.fops			= &sun4i_drv_fops,
	.name			= "sun4i-drm",
	.desc			= "Allwinner sun4i Display Engine",
	.date			= "20150629",
	.major			= 1,
	.minor			= 0,

	/* GEM Operations */
	.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 Operations */
	.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_export	= drm_gem_prime_export,
	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
	.gem_prime_mmap		= drm_gem_cma_prime_mmap,

	/* Frame Buffer Operations */
};

static void sun4i_remove_framebuffers(void)
{
	struct apertures_struct *ap;

	ap = alloc_apertures(1);
	if (!ap)
		return;

	/* The framebuffer can be located anywhere in RAM */
	ap->ranges[0].base = 0;
	ap->ranges[0].size = ~0;

	drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
	kfree(ap);
}

static int sun4i_drv_bind(struct device *dev)
{
	struct drm_device *drm;
	struct sun4i_drv *drv;
	int ret;

	drm = drm_dev_alloc(&sun4i_drv_driver, dev);
	if (IS_ERR(drm))
		return PTR_ERR(drm);

	drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
	if (!drv) {
		ret = -ENOMEM;
		goto free_drm;
	}
	drm->dev_private = drv;
	INIT_LIST_HEAD(&drv->engine_list);
	INIT_LIST_HEAD(&drv->tcon_list);

	ret = of_reserved_mem_device_init(dev);
	if (ret && ret != -ENODEV) {
		dev_err(drm->dev, "Couldn't claim our memory region\n");
		goto free_drm;
	}

	drm_mode_config_init(drm);

	ret = component_bind_all(drm->dev, drm);
	if (ret) {
		dev_err(drm->dev, "Couldn't bind all pipelines components\n");
		goto cleanup_mode_config;
	}

	/* drm_vblank_init calls kcalloc, which can fail */
	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
	if (ret)
		goto free_mem_region;

	drm->irq_enabled = true;

	/* Remove early framebuffers (ie. simplefb) */
	sun4i_remove_framebuffers();

	/* Create our framebuffer */
	ret = sun4i_framebuffer_init(drm);
	if (ret) {
		dev_err(drm->dev, "Couldn't create our framebuffer\n");
		goto cleanup_mode_config;
	}

	/* Enable connectors polling */
	drm_kms_helper_poll_init(drm);

	ret = drm_dev_register(drm, 0);
	if (ret)
		goto finish_poll;

	return 0;

finish_poll:
	drm_kms_helper_poll_fini(drm);
	sun4i_framebuffer_free(drm);
cleanup_mode_config:
	drm_mode_config_cleanup(drm);
free_mem_region:
	of_reserved_mem_device_release(dev);
free_drm:
	drm_dev_unref(drm);
	return ret;
}

static void sun4i_drv_unbind(struct device *dev)
{
	struct drm_device *drm = dev_get_drvdata(dev);

	drm_dev_unregister(drm);
	drm_kms_helper_poll_fini(drm);
	sun4i_framebuffer_free(drm);
	drm_mode_config_cleanup(drm);
	of_reserved_mem_device_release(dev);
	drm_dev_unref(drm);
}

static const struct component_master_ops sun4i_drv_master_ops = {
	.bind	= sun4i_drv_bind,
	.unbind	= sun4i_drv_unbind,
};

static bool sun4i_drv_node_is_connector(struct device_node *node)
{
	return of_device_is_compatible(node, "hdmi-connector");
}

static bool sun4i_drv_node_is_frontend(struct device_node *node)
{
	return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
		of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
		of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
		of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
		of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
}

static bool sun4i_drv_node_is_tcon(struct device_node *node)
{
	return !!of_match_node(sun4i_tcon_of_table, node);
}

static int compare_of(struct device *dev, void *data)
{
	DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
			 dev->of_node,
			 data);

	return dev->of_node == data;
}

/*
 * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 * crtcs from the device tree using of_graph. For the results to be
 * correct, encoders must be probed/bound after _all_ crtcs have been
 * created. The existing code uses a depth first recursive traversal
 * of the of_graph, which means the encoders downstream of the TCON
 * get add right after the first TCON. The second TCON or CRTC will
 * never be properly associated with encoders connected to it.
 *
 * Also, in a dual display pipeline setup, both frontends can feed
 * either backend, and both backends can feed either TCON, we want
 * all components of the same type to be added before the next type
 * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 * i.e. components of the same type are at the same depth when counted
 * from the frontend. The only exception is the third pipeline in
 * the A80 SoC, which we do not support anyway.
 *
 * Hence we can use a breadth first search traversal order to add
 * components. We do not need to check for duplicates. The component
 * matching system handles this for us.
 */
struct endpoint_list {
	DECLARE_KFIFO(fifo, struct device_node *, 16);
};

static int sun4i_drv_add_endpoints(struct device *dev,
				   struct endpoint_list *list,
				   struct component_match **match,
				   struct device_node *node)
{
	struct device_node *port, *ep, *remote;
	int count = 0;

	/*
	 * We don't support the frontend for now, so we will never
	 * have a device bound. Just skip over it, but we still want
	 * the rest our pipeline to be added.
	 */
	if (!sun4i_drv_node_is_frontend(node) &&
	    !of_device_is_available(node))
		return 0;

	/*
	 * The connectors will be the last nodes in our pipeline, we
	 * can just bail out.
	 */
	if (sun4i_drv_node_is_connector(node))
		return 0;

	if (!sun4i_drv_node_is_frontend(node)) {
		/* Add current component */
		DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
		drm_of_component_match_add(dev, match, compare_of, node);
		count++;
	}

	/* Inputs are listed first, then outputs */
	port = of_graph_get_port_by_id(node, 1);
	if (!port) {
		DRM_DEBUG_DRIVER("No output to bind\n");
		return count;
	}

	for_each_available_child_of_node(port, ep) {
		remote = of_graph_get_remote_port_parent(ep);
		if (!remote) {
			DRM_DEBUG_DRIVER("Error retrieving the output node\n");
			of_node_put(remote);
			continue;
		}

		/*
		 * If the node is our TCON, the first port is used for
		 * panel or bridges, and will not be part of the
		 * component framework.
		 */
		if (sun4i_drv_node_is_tcon(node)) {
			struct of_endpoint endpoint;

			if (of_graph_parse_endpoint(ep, &endpoint)) {
				DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
				continue;
			}

			if (!endpoint.id) {
				DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
				continue;
			}
		}

		kfifo_put(&list->fifo, remote);
	}

	return count;
}

static int sun4i_drv_probe(struct platform_device *pdev)
{
	struct component_match *match = NULL;
	struct device_node *np = pdev->dev.of_node, *endpoint;
	struct endpoint_list list;
	int i, ret, count = 0;

	INIT_KFIFO(list.fifo);

	for (i = 0;; i++) {
		struct device_node *pipeline = of_parse_phandle(np,
								"allwinner,pipelines",
								i);
		if (!pipeline)
			break;

		kfifo_put(&list.fifo, pipeline);
	}

	while (kfifo_get(&list.fifo, &endpoint)) {
		/* process this endpoint */
		ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
					      endpoint);

		/* sun4i_drv_add_endpoints can fail to allocate memory */
		if (ret < 0)
			return ret;

		count += ret;
	}

	if (count)
		return component_master_add_with_match(&pdev->dev,
						       &sun4i_drv_master_ops,
						       match);
	else
		return 0;
}

static int sun4i_drv_remove(struct platform_device *pdev)
{
	return 0;
}

static const struct of_device_id sun4i_drv_of_table[] = {
	{ .compatible = "allwinner,sun4i-a10-display-engine" },
	{ .compatible = "allwinner,sun5i-a10s-display-engine" },
	{ .compatible = "allwinner,sun5i-a13-display-engine" },
	{ .compatible = "allwinner,sun6i-a31-display-engine" },
	{ .compatible = "allwinner,sun6i-a31s-display-engine" },
	{ .compatible = "allwinner,sun7i-a20-display-engine" },
	{ .compatible = "allwinner,sun8i-a33-display-engine" },
	{ .compatible = "allwinner,sun8i-a83t-display-engine" },
	{ .compatible = "allwinner,sun8i-v3s-display-engine" },
	{ }
};
MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);

static struct platform_driver sun4i_drv_platform_driver = {
	.probe		= sun4i_drv_probe,
	.remove		= sun4i_drv_remove,
	.driver		= {
		.name		= "sun4i-drm",
		.of_match_table	= sun4i_drv_of_table,
	},
};
module_platform_driver(sun4i_drv_platform_driver);

MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
MODULE_LICENSE("GPL");