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 	.fault = exynos_drm_gem_fault,
80 	.open = drm_gem_vm_open,
81 	.close = drm_gem_vm_close,
82 };
83 
84 static const struct drm_ioctl_desc exynos_ioctls[] = {
85 	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
86 			DRM_RENDER_ALLOW),
87 	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl,
88 			DRM_RENDER_ALLOW),
89 	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
90 			DRM_RENDER_ALLOW),
91 	DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
92 			DRM_AUTH),
93 	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl,
94 			DRM_RENDER_ALLOW),
95 	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl,
96 			DRM_RENDER_ALLOW),
97 	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl,
98 			DRM_RENDER_ALLOW),
99 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_RESOURCES,
100 			exynos_drm_ipp_get_res_ioctl,
101 			DRM_RENDER_ALLOW),
102 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_CAPS, exynos_drm_ipp_get_caps_ioctl,
103 			DRM_RENDER_ALLOW),
104 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_LIMITS,
105 			exynos_drm_ipp_get_limits_ioctl,
106 			DRM_RENDER_ALLOW),
107 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_COMMIT, exynos_drm_ipp_commit_ioctl,
108 			DRM_RENDER_ALLOW),
109 };
110 
111 static const struct file_operations exynos_drm_driver_fops = {
112 	.owner		= THIS_MODULE,
113 	.open		= drm_open,
114 	.mmap		= exynos_drm_gem_mmap,
115 	.poll		= drm_poll,
116 	.read		= drm_read,
117 	.unlocked_ioctl	= drm_ioctl,
118 	.compat_ioctl = drm_compat_ioctl,
119 	.release	= drm_release,
120 };
121 
122 static struct drm_driver exynos_drm_driver = {
123 	.driver_features	= DRIVER_MODESET | DRIVER_GEM
124 				  | DRIVER_ATOMIC | DRIVER_RENDER,
125 	.open			= exynos_drm_open,
126 	.lastclose		= drm_fb_helper_lastclose,
127 	.postclose		= exynos_drm_postclose,
128 	.gem_free_object_unlocked = exynos_drm_gem_free_object,
129 	.gem_vm_ops		= &exynos_drm_gem_vm_ops,
130 	.dumb_create		= exynos_drm_gem_dumb_create,
131 	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
132 	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
133 	.gem_prime_import	= exynos_drm_gem_prime_import,
134 	.gem_prime_get_sg_table	= exynos_drm_gem_prime_get_sg_table,
135 	.gem_prime_import_sg_table	= exynos_drm_gem_prime_import_sg_table,
136 	.gem_prime_vmap		= exynos_drm_gem_prime_vmap,
137 	.gem_prime_vunmap	= exynos_drm_gem_prime_vunmap,
138 	.gem_prime_mmap		= exynos_drm_gem_prime_mmap,
139 	.ioctls			= exynos_ioctls,
140 	.num_ioctls		= ARRAY_SIZE(exynos_ioctls),
141 	.fops			= &exynos_drm_driver_fops,
142 	.name	= DRIVER_NAME,
143 	.desc	= DRIVER_DESC,
144 	.date	= DRIVER_DATE,
145 	.major	= DRIVER_MAJOR,
146 	.minor	= DRIVER_MINOR,
147 };
148 
149 static int exynos_drm_suspend(struct device *dev)
150 {
151 	struct drm_device *drm_dev = dev_get_drvdata(dev);
152 
153 	return  drm_mode_config_helper_suspend(drm_dev);
154 }
155 
156 static void exynos_drm_resume(struct device *dev)
157 {
158 	struct drm_device *drm_dev = dev_get_drvdata(dev);
159 
160 	drm_mode_config_helper_resume(drm_dev);
161 }
162 
163 static const struct dev_pm_ops exynos_drm_pm_ops = {
164 	.prepare = exynos_drm_suspend,
165 	.complete = exynos_drm_resume,
166 };
167 
168 /* forward declaration */
169 static struct platform_driver exynos_drm_platform_driver;
170 
171 struct exynos_drm_driver_info {
172 	struct platform_driver *driver;
173 	unsigned int flags;
174 };
175 
176 #define DRM_COMPONENT_DRIVER	BIT(0)	/* supports component framework */
177 #define DRM_VIRTUAL_DEVICE	BIT(1)	/* create virtual platform device */
178 #define DRM_FIMC_DEVICE		BIT(2)	/* devices shared with V4L2 subsystem */
179 
180 #define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL)
181 
182 /*
183  * Connector drivers should not be placed before associated crtc drivers,
184  * because connector requires pipe number of its crtc during initialization.
185  */
186 static struct exynos_drm_driver_info exynos_drm_drivers[] = {
187 	{
188 		DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD),
189 		DRM_COMPONENT_DRIVER
190 	}, {
191 		DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON),
192 		DRM_COMPONENT_DRIVER
193 	}, {
194 		DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON),
195 		DRM_COMPONENT_DRIVER
196 	}, {
197 		DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER),
198 		DRM_COMPONENT_DRIVER
199 	}, {
200 		DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC),
201 		DRM_COMPONENT_DRIVER
202 	}, {
203 		DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP),
204 		DRM_COMPONENT_DRIVER
205 	}, {
206 		DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI),
207 		DRM_COMPONENT_DRIVER
208 	}, {
209 		DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI),
210 		DRM_COMPONENT_DRIVER
211 	}, {
212 		DRV_PTR(vidi_driver, CONFIG_DRM_EXYNOS_VIDI),
213 		DRM_COMPONENT_DRIVER | DRM_VIRTUAL_DEVICE
214 	}, {
215 		DRV_PTR(g2d_driver, CONFIG_DRM_EXYNOS_G2D),
216 		DRM_COMPONENT_DRIVER
217 	}, {
218 		DRV_PTR(fimc_driver, CONFIG_DRM_EXYNOS_FIMC),
219 		DRM_COMPONENT_DRIVER | DRM_FIMC_DEVICE,
220 	}, {
221 		DRV_PTR(rotator_driver, CONFIG_DRM_EXYNOS_ROTATOR),
222 		DRM_COMPONENT_DRIVER
223 	}, {
224 		DRV_PTR(scaler_driver, CONFIG_DRM_EXYNOS_SCALER),
225 		DRM_COMPONENT_DRIVER
226 	}, {
227 		DRV_PTR(gsc_driver, CONFIG_DRM_EXYNOS_GSC),
228 		DRM_COMPONENT_DRIVER
229 	}, {
230 		&exynos_drm_platform_driver,
231 		DRM_VIRTUAL_DEVICE
232 	}
233 };
234 
235 static int compare_dev(struct device *dev, void *data)
236 {
237 	return dev == (struct device *)data;
238 }
239 
240 static struct component_match *exynos_drm_match_add(struct device *dev)
241 {
242 	struct component_match *match = NULL;
243 	int i;
244 
245 	for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
246 		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
247 		struct device *p = NULL, *d;
248 
249 		if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))
250 			continue;
251 
252 		while ((d = bus_find_device(&platform_bus_type, p,
253 					    &info->driver->driver,
254 					    (void *)platform_bus_type.match))) {
255 			put_device(p);
256 
257 			if (!(info->flags & DRM_FIMC_DEVICE) ||
258 			    exynos_drm_check_fimc_device(d) == 0)
259 				component_match_add(dev, &match,
260 						    compare_dev, d);
261 			p = d;
262 		}
263 		put_device(p);
264 	}
265 
266 	return match ?: ERR_PTR(-ENODEV);
267 }
268 
269 static int exynos_drm_bind(struct device *dev)
270 {
271 	struct exynos_drm_private *private;
272 	struct drm_encoder *encoder;
273 	struct drm_device *drm;
274 	unsigned int clone_mask;
275 	int cnt, ret;
276 
277 	drm = drm_dev_alloc(&exynos_drm_driver, dev);
278 	if (IS_ERR(drm))
279 		return PTR_ERR(drm);
280 
281 	private = kzalloc(sizeof(struct exynos_drm_private), GFP_KERNEL);
282 	if (!private) {
283 		ret = -ENOMEM;
284 		goto err_free_drm;
285 	}
286 
287 	init_waitqueue_head(&private->wait);
288 	spin_lock_init(&private->lock);
289 
290 	dev_set_drvdata(dev, drm);
291 	drm->dev_private = (void *)private;
292 
293 	drm_mode_config_init(drm);
294 
295 	exynos_drm_mode_config_init(drm);
296 
297 	/* setup possible_clones. */
298 	cnt = 0;
299 	clone_mask = 0;
300 	list_for_each_entry(encoder, &drm->mode_config.encoder_list, head)
301 		clone_mask |= (1 << (cnt++));
302 
303 	list_for_each_entry(encoder, &drm->mode_config.encoder_list, head)
304 		encoder->possible_clones = clone_mask;
305 
306 	/* Try to bind all sub drivers. */
307 	ret = component_bind_all(drm->dev, drm);
308 	if (ret)
309 		goto err_mode_config_cleanup;
310 
311 	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
312 	if (ret)
313 		goto err_unbind_all;
314 
315 	drm_mode_config_reset(drm);
316 
317 	/*
318 	 * enable drm irq mode.
319 	 * - with irq_enabled = true, we can use the vblank feature.
320 	 *
321 	 * P.S. note that we wouldn't use drm irq handler but
322 	 *	just specific driver own one instead because
323 	 *	drm framework supports only one irq handler.
324 	 */
325 	drm->irq_enabled = true;
326 
327 	/* init kms poll for handling hpd */
328 	drm_kms_helper_poll_init(drm);
329 
330 	ret = exynos_drm_fbdev_init(drm);
331 	if (ret)
332 		goto err_cleanup_poll;
333 
334 	/* register the DRM device */
335 	ret = drm_dev_register(drm, 0);
336 	if (ret < 0)
337 		goto err_cleanup_fbdev;
338 
339 	return 0;
340 
341 err_cleanup_fbdev:
342 	exynos_drm_fbdev_fini(drm);
343 err_cleanup_poll:
344 	drm_kms_helper_poll_fini(drm);
345 err_unbind_all:
346 	component_unbind_all(drm->dev, drm);
347 err_mode_config_cleanup:
348 	drm_mode_config_cleanup(drm);
349 	exynos_drm_cleanup_dma(drm);
350 	kfree(private);
351 err_free_drm:
352 	drm_dev_put(drm);
353 
354 	return ret;
355 }
356 
357 static void exynos_drm_unbind(struct device *dev)
358 {
359 	struct drm_device *drm = dev_get_drvdata(dev);
360 
361 	drm_dev_unregister(drm);
362 
363 	exynos_drm_fbdev_fini(drm);
364 	drm_kms_helper_poll_fini(drm);
365 
366 	component_unbind_all(drm->dev, drm);
367 	drm_mode_config_cleanup(drm);
368 	exynos_drm_cleanup_dma(drm);
369 
370 	kfree(drm->dev_private);
371 	drm->dev_private = NULL;
372 	dev_set_drvdata(dev, NULL);
373 
374 	drm_dev_put(drm);
375 }
376 
377 static const struct component_master_ops exynos_drm_ops = {
378 	.bind		= exynos_drm_bind,
379 	.unbind		= exynos_drm_unbind,
380 };
381 
382 static int exynos_drm_platform_probe(struct platform_device *pdev)
383 {
384 	struct component_match *match;
385 
386 	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
387 
388 	match = exynos_drm_match_add(&pdev->dev);
389 	if (IS_ERR(match))
390 		return PTR_ERR(match);
391 
392 	return component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
393 					       match);
394 }
395 
396 static int exynos_drm_platform_remove(struct platform_device *pdev)
397 {
398 	component_master_del(&pdev->dev, &exynos_drm_ops);
399 	return 0;
400 }
401 
402 static struct platform_driver exynos_drm_platform_driver = {
403 	.probe	= exynos_drm_platform_probe,
404 	.remove	= exynos_drm_platform_remove,
405 	.driver	= {
406 		.name	= "exynos-drm",
407 		.pm	= &exynos_drm_pm_ops,
408 	},
409 };
410 
411 static void exynos_drm_unregister_devices(void)
412 {
413 	int i;
414 
415 	for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
416 		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
417 		struct device *dev;
418 
419 		if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
420 			continue;
421 
422 		while ((dev = bus_find_device(&platform_bus_type, NULL,
423 					    &info->driver->driver,
424 					    (void *)platform_bus_type.match))) {
425 			put_device(dev);
426 			platform_device_unregister(to_platform_device(dev));
427 		}
428 	}
429 }
430 
431 static int exynos_drm_register_devices(void)
432 {
433 	struct platform_device *pdev;
434 	int i;
435 
436 	for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
437 		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
438 
439 		if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
440 			continue;
441 
442 		pdev = platform_device_register_simple(
443 					info->driver->driver.name, -1, NULL, 0);
444 		if (IS_ERR(pdev))
445 			goto fail;
446 	}
447 
448 	return 0;
449 fail:
450 	exynos_drm_unregister_devices();
451 	return PTR_ERR(pdev);
452 }
453 
454 static void exynos_drm_unregister_drivers(void)
455 {
456 	int i;
457 
458 	for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
459 		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
460 
461 		if (!info->driver)
462 			continue;
463 
464 		platform_driver_unregister(info->driver);
465 	}
466 }
467 
468 static int exynos_drm_register_drivers(void)
469 {
470 	int i, ret;
471 
472 	for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
473 		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
474 
475 		if (!info->driver)
476 			continue;
477 
478 		ret = platform_driver_register(info->driver);
479 		if (ret)
480 			goto fail;
481 	}
482 	return 0;
483 fail:
484 	exynos_drm_unregister_drivers();
485 	return ret;
486 }
487 
488 static int exynos_drm_init(void)
489 {
490 	int ret;
491 
492 	ret = exynos_drm_register_devices();
493 	if (ret)
494 		return ret;
495 
496 	ret = exynos_drm_register_drivers();
497 	if (ret)
498 		goto err_unregister_pdevs;
499 
500 	return 0;
501 
502 err_unregister_pdevs:
503 	exynos_drm_unregister_devices();
504 
505 	return ret;
506 }
507 
508 static void exynos_drm_exit(void)
509 {
510 	exynos_drm_unregister_drivers();
511 	exynos_drm_unregister_devices();
512 }
513 
514 module_init(exynos_drm_init);
515 module_exit(exynos_drm_exit);
516 
517 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
518 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
519 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
520 MODULE_DESCRIPTION("Samsung SoC DRM Driver");
521 MODULE_LICENSE("GPL");
522