1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4  * Authors:
5  *	Inki Dae <inki.dae@samsung.com>
6  *	Joonyoung Shim <jy0922.shim@samsung.com>
7  *	Seung-Woo Kim <sw0312.kim@samsung.com>
8  */
9 
10 #include <linux/component.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/platform_device.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/uaccess.h>
15 
16 #include <drm/drm_atomic.h>
17 #include <drm/drm_atomic_helper.h>
18 #include <drm/drm_drv.h>
19 #include <drm/drm_fb_helper.h>
20 #include <drm/drm_file.h>
21 #include <drm/drm_fourcc.h>
22 #include <drm/drm_ioctl.h>
23 #include <drm/drm_probe_helper.h>
24 #include <drm/drm_vblank.h>
25 #include <drm/exynos_drm.h>
26 
27 #include "exynos_drm_drv.h"
28 #include "exynos_drm_fb.h"
29 #include "exynos_drm_fbdev.h"
30 #include "exynos_drm_g2d.h"
31 #include "exynos_drm_gem.h"
32 #include "exynos_drm_ipp.h"
33 #include "exynos_drm_plane.h"
34 #include "exynos_drm_vidi.h"
35 
36 #define DRIVER_NAME	"exynos"
37 #define DRIVER_DESC	"Samsung SoC DRM"
38 #define DRIVER_DATE	"20180330"
39 
40 /*
41  * Interface history:
42  *
43  * 1.0 - Original version
44  * 1.1 - Upgrade IPP driver to version 2.0
45  */
46 #define DRIVER_MAJOR	1
47 #define DRIVER_MINOR	1
48 
49 static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
50 {
51 	struct drm_exynos_file_private *file_priv;
52 	int ret;
53 
54 	file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
55 	if (!file_priv)
56 		return -ENOMEM;
57 
58 	file->driver_priv = file_priv;
59 	ret = g2d_open(dev, file);
60 	if (ret)
61 		goto err_file_priv_free;
62 
63 	return ret;
64 
65 err_file_priv_free:
66 	kfree(file_priv);
67 	file->driver_priv = NULL;
68 	return ret;
69 }
70 
71 static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
72 {
73 	g2d_close(dev, file);
74 	kfree(file->driver_priv);
75 	file->driver_priv = NULL;
76 }
77 
78 static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
79 	.open = drm_gem_vm_open,
80 	.close = drm_gem_vm_close,
81 };
82 
83 static const struct drm_ioctl_desc exynos_ioctls[] = {
84 	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
85 			DRM_RENDER_ALLOW),
86 	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl,
87 			DRM_RENDER_ALLOW),
88 	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
89 			DRM_RENDER_ALLOW),
90 	DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
91 			DRM_AUTH),
92 	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl,
93 			DRM_RENDER_ALLOW),
94 	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl,
95 			DRM_RENDER_ALLOW),
96 	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl,
97 			DRM_RENDER_ALLOW),
98 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_RESOURCES,
99 			exynos_drm_ipp_get_res_ioctl,
100 			DRM_RENDER_ALLOW),
101 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_CAPS, exynos_drm_ipp_get_caps_ioctl,
102 			DRM_RENDER_ALLOW),
103 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_LIMITS,
104 			exynos_drm_ipp_get_limits_ioctl,
105 			DRM_RENDER_ALLOW),
106 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_COMMIT, exynos_drm_ipp_commit_ioctl,
107 			DRM_RENDER_ALLOW),
108 };
109 
110 static const struct file_operations exynos_drm_driver_fops = {
111 	.owner		= THIS_MODULE,
112 	.open		= drm_open,
113 	.mmap		= exynos_drm_gem_mmap,
114 	.poll		= drm_poll,
115 	.read		= drm_read,
116 	.unlocked_ioctl	= drm_ioctl,
117 	.compat_ioctl = drm_compat_ioctl,
118 	.release	= drm_release,
119 };
120 
121 static struct drm_driver exynos_drm_driver = {
122 	.driver_features	= DRIVER_MODESET | DRIVER_GEM
123 				  | DRIVER_ATOMIC | DRIVER_RENDER,
124 	.open			= exynos_drm_open,
125 	.lastclose		= drm_fb_helper_lastclose,
126 	.postclose		= exynos_drm_postclose,
127 	.gem_free_object_unlocked = exynos_drm_gem_free_object,
128 	.gem_vm_ops		= &exynos_drm_gem_vm_ops,
129 	.dumb_create		= exynos_drm_gem_dumb_create,
130 	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
131 	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
132 	.gem_prime_import	= exynos_drm_gem_prime_import,
133 	.gem_prime_get_sg_table	= exynos_drm_gem_prime_get_sg_table,
134 	.gem_prime_import_sg_table	= exynos_drm_gem_prime_import_sg_table,
135 	.gem_prime_vmap		= exynos_drm_gem_prime_vmap,
136 	.gem_prime_vunmap	= exynos_drm_gem_prime_vunmap,
137 	.gem_prime_mmap		= exynos_drm_gem_prime_mmap,
138 	.ioctls			= exynos_ioctls,
139 	.num_ioctls		= ARRAY_SIZE(exynos_ioctls),
140 	.fops			= &exynos_drm_driver_fops,
141 	.name	= DRIVER_NAME,
142 	.desc	= DRIVER_DESC,
143 	.date	= DRIVER_DATE,
144 	.major	= DRIVER_MAJOR,
145 	.minor	= DRIVER_MINOR,
146 };
147 
148 static int exynos_drm_suspend(struct device *dev)
149 {
150 	struct drm_device *drm_dev = dev_get_drvdata(dev);
151 
152 	return  drm_mode_config_helper_suspend(drm_dev);
153 }
154 
155 static void exynos_drm_resume(struct device *dev)
156 {
157 	struct drm_device *drm_dev = dev_get_drvdata(dev);
158 
159 	drm_mode_config_helper_resume(drm_dev);
160 }
161 
162 static const struct dev_pm_ops exynos_drm_pm_ops = {
163 	.prepare = exynos_drm_suspend,
164 	.complete = exynos_drm_resume,
165 };
166 
167 /* forward declaration */
168 static struct platform_driver exynos_drm_platform_driver;
169 
170 struct exynos_drm_driver_info {
171 	struct platform_driver *driver;
172 	unsigned int flags;
173 };
174 
175 #define DRM_COMPONENT_DRIVER	BIT(0)	/* supports component framework */
176 #define DRM_VIRTUAL_DEVICE	BIT(1)	/* create virtual platform device */
177 #define DRM_FIMC_DEVICE		BIT(2)	/* devices shared with V4L2 subsystem */
178 
179 #define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL)
180 
181 /*
182  * Connector drivers should not be placed before associated crtc drivers,
183  * because connector requires pipe number of its crtc during initialization.
184  */
185 static struct exynos_drm_driver_info exynos_drm_drivers[] = {
186 	{
187 		DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD),
188 		DRM_COMPONENT_DRIVER
189 	}, {
190 		DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON),
191 		DRM_COMPONENT_DRIVER
192 	}, {
193 		DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON),
194 		DRM_COMPONENT_DRIVER
195 	}, {
196 		DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER),
197 		DRM_COMPONENT_DRIVER
198 	}, {
199 		DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC),
200 		DRM_COMPONENT_DRIVER
201 	}, {
202 		DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP),
203 		DRM_COMPONENT_DRIVER
204 	}, {
205 		DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI),
206 		DRM_COMPONENT_DRIVER
207 	}, {
208 		DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI),
209 		DRM_COMPONENT_DRIVER
210 	}, {
211 		DRV_PTR(vidi_driver, CONFIG_DRM_EXYNOS_VIDI),
212 		DRM_COMPONENT_DRIVER | DRM_VIRTUAL_DEVICE
213 	}, {
214 		DRV_PTR(g2d_driver, CONFIG_DRM_EXYNOS_G2D),
215 		DRM_COMPONENT_DRIVER
216 	}, {
217 		DRV_PTR(fimc_driver, CONFIG_DRM_EXYNOS_FIMC),
218 		DRM_COMPONENT_DRIVER | DRM_FIMC_DEVICE,
219 	}, {
220 		DRV_PTR(rotator_driver, CONFIG_DRM_EXYNOS_ROTATOR),
221 		DRM_COMPONENT_DRIVER
222 	}, {
223 		DRV_PTR(scaler_driver, CONFIG_DRM_EXYNOS_SCALER),
224 		DRM_COMPONENT_DRIVER
225 	}, {
226 		DRV_PTR(gsc_driver, CONFIG_DRM_EXYNOS_GSC),
227 		DRM_COMPONENT_DRIVER
228 	}, {
229 		&exynos_drm_platform_driver,
230 		DRM_VIRTUAL_DEVICE
231 	}
232 };
233 
234 static int compare_dev(struct device *dev, void *data)
235 {
236 	return dev == (struct device *)data;
237 }
238 
239 static struct component_match *exynos_drm_match_add(struct device *dev)
240 {
241 	struct component_match *match = NULL;
242 	int i;
243 
244 	for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
245 		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
246 		struct device *p = NULL, *d;
247 
248 		if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))
249 			continue;
250 
251 		while ((d = platform_find_device_by_driver(p, &info->driver->driver))) {
252 			put_device(p);
253 
254 			if (!(info->flags & DRM_FIMC_DEVICE) ||
255 			    exynos_drm_check_fimc_device(d) == 0)
256 				component_match_add(dev, &match,
257 						    compare_dev, d);
258 			p = d;
259 		}
260 		put_device(p);
261 	}
262 
263 	return match ?: ERR_PTR(-ENODEV);
264 }
265 
266 static int exynos_drm_bind(struct device *dev)
267 {
268 	struct exynos_drm_private *private;
269 	struct drm_encoder *encoder;
270 	struct drm_device *drm;
271 	unsigned int clone_mask;
272 	int ret;
273 
274 	drm = drm_dev_alloc(&exynos_drm_driver, dev);
275 	if (IS_ERR(drm))
276 		return PTR_ERR(drm);
277 
278 	private = kzalloc(sizeof(struct exynos_drm_private), GFP_KERNEL);
279 	if (!private) {
280 		ret = -ENOMEM;
281 		goto err_free_drm;
282 	}
283 
284 	init_waitqueue_head(&private->wait);
285 	spin_lock_init(&private->lock);
286 
287 	dev_set_drvdata(dev, drm);
288 	drm->dev_private = (void *)private;
289 
290 	drm_mode_config_init(drm);
291 
292 	exynos_drm_mode_config_init(drm);
293 
294 	/* setup possible_clones. */
295 	clone_mask = 0;
296 	list_for_each_entry(encoder, &drm->mode_config.encoder_list, head)
297 		clone_mask |= drm_encoder_mask(encoder);
298 
299 	list_for_each_entry(encoder, &drm->mode_config.encoder_list, head)
300 		encoder->possible_clones = clone_mask;
301 
302 	/* Try to bind all sub drivers. */
303 	ret = component_bind_all(drm->dev, drm);
304 	if (ret)
305 		goto err_mode_config_cleanup;
306 
307 	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
308 	if (ret)
309 		goto err_unbind_all;
310 
311 	drm_mode_config_reset(drm);
312 
313 	/*
314 	 * enable drm irq mode.
315 	 * - with irq_enabled = true, we can use the vblank feature.
316 	 *
317 	 * P.S. note that we wouldn't use drm irq handler but
318 	 *	just specific driver own one instead because
319 	 *	drm framework supports only one irq handler.
320 	 */
321 	drm->irq_enabled = true;
322 
323 	/* init kms poll for handling hpd */
324 	drm_kms_helper_poll_init(drm);
325 
326 	ret = exynos_drm_fbdev_init(drm);
327 	if (ret)
328 		goto err_cleanup_poll;
329 
330 	/* register the DRM device */
331 	ret = drm_dev_register(drm, 0);
332 	if (ret < 0)
333 		goto err_cleanup_fbdev;
334 
335 	return 0;
336 
337 err_cleanup_fbdev:
338 	exynos_drm_fbdev_fini(drm);
339 err_cleanup_poll:
340 	drm_kms_helper_poll_fini(drm);
341 err_unbind_all:
342 	component_unbind_all(drm->dev, drm);
343 err_mode_config_cleanup:
344 	drm_mode_config_cleanup(drm);
345 	exynos_drm_cleanup_dma(drm);
346 	kfree(private);
347 err_free_drm:
348 	drm_dev_put(drm);
349 
350 	return ret;
351 }
352 
353 static void exynos_drm_unbind(struct device *dev)
354 {
355 	struct drm_device *drm = dev_get_drvdata(dev);
356 
357 	drm_dev_unregister(drm);
358 
359 	exynos_drm_fbdev_fini(drm);
360 	drm_kms_helper_poll_fini(drm);
361 
362 	component_unbind_all(drm->dev, drm);
363 	drm_mode_config_cleanup(drm);
364 	exynos_drm_cleanup_dma(drm);
365 
366 	kfree(drm->dev_private);
367 	drm->dev_private = NULL;
368 	dev_set_drvdata(dev, NULL);
369 
370 	drm_dev_put(drm);
371 }
372 
373 static const struct component_master_ops exynos_drm_ops = {
374 	.bind		= exynos_drm_bind,
375 	.unbind		= exynos_drm_unbind,
376 };
377 
378 static int exynos_drm_platform_probe(struct platform_device *pdev)
379 {
380 	struct component_match *match;
381 
382 	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
383 
384 	match = exynos_drm_match_add(&pdev->dev);
385 	if (IS_ERR(match))
386 		return PTR_ERR(match);
387 
388 	return component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
389 					       match);
390 }
391 
392 static int exynos_drm_platform_remove(struct platform_device *pdev)
393 {
394 	component_master_del(&pdev->dev, &exynos_drm_ops);
395 	return 0;
396 }
397 
398 static struct platform_driver exynos_drm_platform_driver = {
399 	.probe	= exynos_drm_platform_probe,
400 	.remove	= exynos_drm_platform_remove,
401 	.driver	= {
402 		.name	= "exynos-drm",
403 		.pm	= &exynos_drm_pm_ops,
404 	},
405 };
406 
407 static void exynos_drm_unregister_devices(void)
408 {
409 	int i;
410 
411 	for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
412 		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
413 		struct device *dev;
414 
415 		if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
416 			continue;
417 
418 		while ((dev = platform_find_device_by_driver(NULL,
419 						&info->driver->driver))) {
420 			put_device(dev);
421 			platform_device_unregister(to_platform_device(dev));
422 		}
423 	}
424 }
425 
426 static int exynos_drm_register_devices(void)
427 {
428 	struct platform_device *pdev;
429 	int i;
430 
431 	for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
432 		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
433 
434 		if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
435 			continue;
436 
437 		pdev = platform_device_register_simple(
438 					info->driver->driver.name, -1, NULL, 0);
439 		if (IS_ERR(pdev))
440 			goto fail;
441 	}
442 
443 	return 0;
444 fail:
445 	exynos_drm_unregister_devices();
446 	return PTR_ERR(pdev);
447 }
448 
449 static void exynos_drm_unregister_drivers(void)
450 {
451 	int i;
452 
453 	for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
454 		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
455 
456 		if (!info->driver)
457 			continue;
458 
459 		platform_driver_unregister(info->driver);
460 	}
461 }
462 
463 static int exynos_drm_register_drivers(void)
464 {
465 	int i, ret;
466 
467 	for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
468 		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
469 
470 		if (!info->driver)
471 			continue;
472 
473 		ret = platform_driver_register(info->driver);
474 		if (ret)
475 			goto fail;
476 	}
477 	return 0;
478 fail:
479 	exynos_drm_unregister_drivers();
480 	return ret;
481 }
482 
483 static int exynos_drm_init(void)
484 {
485 	int ret;
486 
487 	ret = exynos_drm_register_devices();
488 	if (ret)
489 		return ret;
490 
491 	ret = exynos_drm_register_drivers();
492 	if (ret)
493 		goto err_unregister_pdevs;
494 
495 	return 0;
496 
497 err_unregister_pdevs:
498 	exynos_drm_unregister_devices();
499 
500 	return ret;
501 }
502 
503 static void exynos_drm_exit(void)
504 {
505 	exynos_drm_unregister_drivers();
506 	exynos_drm_unregister_devices();
507 }
508 
509 module_init(exynos_drm_init);
510 module_exit(exynos_drm_exit);
511 
512 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
513 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
514 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
515 MODULE_DESCRIPTION("Samsung SoC DRM Driver");
516 MODULE_LICENSE("GPL");
517