summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/sti/sti_drm_drv.c
blob: 59d558b400b33f390cdd6db00014ab29c94b84d4 (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
/*
 * Copyright (C) STMicroelectronics SA 2014
 * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
 * License terms:  GNU General Public License (GPL), version 2
 */

#include <drm/drmP.h>

#include <linux/component.h>
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_platform.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_cma_helper.h>

#include "sti_drm_drv.h"
#include "sti_drm_crtc.h"

#define DRIVER_NAME	"sti"
#define DRIVER_DESC	"STMicroelectronics SoC DRM"
#define DRIVER_DATE	"20140601"
#define DRIVER_MAJOR	1
#define DRIVER_MINOR	0

#define STI_MAX_FB_HEIGHT	4096
#define STI_MAX_FB_WIDTH	4096

static void sti_drm_atomic_schedule(struct sti_drm_private *private,
				  struct drm_atomic_state *state)
{
	private->commit.state = state;
	schedule_work(&private->commit.work);
}

static void sti_drm_atomic_complete(struct sti_drm_private *private,
				  struct drm_atomic_state *state)
{
	struct drm_device *drm = private->drm_dev;

	/*
	 * Everything below can be run asynchronously without the need to grab
	 * any modeset locks at all under one condition: It must be guaranteed
	 * that the asynchronous work has either been cancelled (if the driver
	 * supports it, which at least requires that the framebuffers get
	 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
	 * before the new state gets committed on the software side with
	 * drm_atomic_helper_swap_state().
	 *
	 * This scheme allows new atomic state updates to be prepared and
	 * checked in parallel to the asynchronous completion of the previous
	 * update. Which is important since compositors need to figure out the
	 * composition of the next frame right after having submitted the
	 * current layout.
	 */

	drm_atomic_helper_commit_modeset_disables(drm, state);
	drm_atomic_helper_commit_planes(drm, state);
	drm_atomic_helper_commit_modeset_enables(drm, state);

	drm_atomic_helper_wait_for_vblanks(drm, state);

	drm_atomic_helper_cleanup_planes(drm, state);
	drm_atomic_state_free(state);
}

static void sti_drm_atomic_work(struct work_struct *work)
{
	struct sti_drm_private *private = container_of(work,
			struct sti_drm_private, commit.work);

	sti_drm_atomic_complete(private, private->commit.state);
}

static int sti_drm_atomic_commit(struct drm_device *drm,
			       struct drm_atomic_state *state, bool async)
{
	struct sti_drm_private *private = drm->dev_private;
	int err;

	err = drm_atomic_helper_prepare_planes(drm, state);
	if (err)
		return err;

	/* serialize outstanding asynchronous commits */
	mutex_lock(&private->commit.lock);
	flush_work(&private->commit.work);

	/*
	 * This is the point of no return - everything below never fails except
	 * when the hw goes bonghits. Which means we can commit the new state on
	 * the software side now.
	 */

	drm_atomic_helper_swap_state(drm, state);

	if (async)
		sti_drm_atomic_schedule(private, state);
	else
		sti_drm_atomic_complete(private, state);

	mutex_unlock(&private->commit.lock);
	return 0;
}

static struct drm_mode_config_funcs sti_drm_mode_config_funcs = {
	.fb_create = drm_fb_cma_create,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = sti_drm_atomic_commit,
};

static void sti_drm_mode_config_init(struct drm_device *dev)
{
	dev->mode_config.min_width = 0;
	dev->mode_config.min_height = 0;

	/*
	 * set max width and height as default value.
	 * this value would be used to check framebuffer size limitation
	 * at drm_mode_addfb().
	 */
	dev->mode_config.max_width = STI_MAX_FB_HEIGHT;
	dev->mode_config.max_height = STI_MAX_FB_WIDTH;

	dev->mode_config.funcs = &sti_drm_mode_config_funcs;
}

static int sti_drm_load(struct drm_device *dev, unsigned long flags)
{
	struct sti_drm_private *private;
	int ret;

	private = kzalloc(sizeof(struct sti_drm_private), GFP_KERNEL);
	if (!private) {
		DRM_ERROR("Failed to allocate private\n");
		return -ENOMEM;
	}
	dev->dev_private = (void *)private;
	private->drm_dev = dev;

	mutex_init(&private->commit.lock);
	INIT_WORK(&private->commit.work, sti_drm_atomic_work);

	drm_mode_config_init(dev);
	drm_kms_helper_poll_init(dev);

	sti_drm_mode_config_init(dev);

	ret = component_bind_all(dev->dev, dev);
	if (ret) {
		drm_kms_helper_poll_fini(dev);
		drm_mode_config_cleanup(dev);
		kfree(private);
		return ret;
	}

	drm_mode_config_reset(dev);

#ifdef CONFIG_DRM_STI_FBDEV
	drm_fbdev_cma_init(dev, 32,
		   dev->mode_config.num_crtc,
		   dev->mode_config.num_connector);
#endif
	return 0;
}

static const struct file_operations sti_drm_driver_fops = {
	.owner = THIS_MODULE,
	.open = drm_open,
	.mmap = drm_gem_cma_mmap,
	.poll = drm_poll,
	.read = drm_read,
	.unlocked_ioctl = drm_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = drm_compat_ioctl,
#endif
	.release = drm_release,
};

static struct dma_buf *sti_drm_gem_prime_export(struct drm_device *dev,
						struct drm_gem_object *obj,
						int flags)
{
	/* we want to be able to write in mmapped buffer */
	flags |= O_RDWR;
	return drm_gem_prime_export(dev, obj, flags);
}

static struct drm_driver sti_drm_driver = {
	.driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET |
	    DRIVER_GEM | DRIVER_PRIME,
	.load = sti_drm_load,
	.gem_free_object = drm_gem_cma_free_object,
	.gem_vm_ops = &drm_gem_cma_vm_ops,
	.dumb_create = drm_gem_cma_dumb_create,
	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
	.dumb_destroy = drm_gem_dumb_destroy,
	.fops = &sti_drm_driver_fops,

	.get_vblank_counter = drm_vblank_count,
	.enable_vblank = sti_drm_crtc_enable_vblank,
	.disable_vblank = sti_drm_crtc_disable_vblank,

	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_prime_export = sti_drm_gem_prime_export,
	.gem_prime_import = drm_gem_prime_import,
	.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,

	.name = DRIVER_NAME,
	.desc = DRIVER_DESC,
	.date = DRIVER_DATE,
	.major = DRIVER_MAJOR,
	.minor = DRIVER_MINOR,
};

static int compare_of(struct device *dev, void *data)
{
	return dev->of_node == data;
}

static int sti_drm_bind(struct device *dev)
{
	return drm_platform_init(&sti_drm_driver, to_platform_device(dev));
}

static void sti_drm_unbind(struct device *dev)
{
	drm_put_dev(dev_get_drvdata(dev));
}

static const struct component_master_ops sti_drm_ops = {
	.bind = sti_drm_bind,
	.unbind = sti_drm_unbind,
};

static int sti_drm_master_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *node = dev->parent->of_node;
	struct device_node *child_np;
	struct component_match *match = NULL;

	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));

	child_np = of_get_next_available_child(node, NULL);

	while (child_np) {
		component_match_add(dev, &match, compare_of, child_np);
		of_node_put(child_np);
		child_np = of_get_next_available_child(node, child_np);
	}

	return component_master_add_with_match(dev, &sti_drm_ops, match);
}

static int sti_drm_master_remove(struct platform_device *pdev)
{
	component_master_del(&pdev->dev, &sti_drm_ops);
	return 0;
}

static struct platform_driver sti_drm_master_driver = {
	.probe = sti_drm_master_probe,
	.remove = sti_drm_master_remove,
	.driver = {
		.name = DRIVER_NAME "__master",
	},
};

static int sti_drm_platform_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *node = dev->of_node;
	struct platform_device *master;

	of_platform_populate(node, NULL, NULL, dev);

	platform_driver_register(&sti_drm_master_driver);
	master = platform_device_register_resndata(dev,
			DRIVER_NAME "__master", -1,
			NULL, 0, NULL, 0);
	if (IS_ERR(master))
               return PTR_ERR(master);

	platform_set_drvdata(pdev, master);
	return 0;
}

static int sti_drm_platform_remove(struct platform_device *pdev)
{
	struct platform_device *master = platform_get_drvdata(pdev);

	of_platform_depopulate(&pdev->dev);
	platform_device_unregister(master);
	platform_driver_unregister(&sti_drm_master_driver);
	return 0;
}

static const struct of_device_id sti_drm_dt_ids[] = {
	{ .compatible = "st,sti-display-subsystem", },
	{ /* end node */ },
};
MODULE_DEVICE_TABLE(of, sti_drm_dt_ids);

static struct platform_driver sti_drm_platform_driver = {
	.probe = sti_drm_platform_probe,
	.remove = sti_drm_platform_remove,
	.driver = {
		.name = DRIVER_NAME,
		.of_match_table = sti_drm_dt_ids,
	},
};

module_platform_driver(sti_drm_platform_driver);

MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
MODULE_LICENSE("GPL");