1/*
  2 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  3 * Authors:
  4 *	Inki Dae <inki.dae@samsung.com>
  5 *	Joonyoung Shim <jy0922.shim@samsung.com>
  6 *	Seung-Woo Kim <sw0312.kim@samsung.com>
  7 *
  8 * This program is free software; you can redistribute  it and/or modify it
  9 * under  the terms of  the GNU General  Public License as published by the
 10 * Free Software Foundation;  either version 2 of the  License, or (at your
 11 * option) any later version.
 12 */
 13
 14#include <linux/pm_runtime.h>
 15#include <drm/drmP.h>
 16#include <drm/drm_atomic.h>
 17#include <drm/drm_atomic_helper.h>
 18#include <drm/drm_crtc_helper.h>
 19#include <drm/drm_fb_helper.h>
 20
 21#include <linux/component.h>
 22
 23#include <drm/exynos_drm.h>
 24
 25#include "exynos_drm_drv.h"
 26#include "exynos_drm_fbdev.h"
 27#include "exynos_drm_fb.h"
 28#include "exynos_drm_gem.h"
 29#include "exynos_drm_plane.h"
 30#include "exynos_drm_vidi.h"
 31#include "exynos_drm_g2d.h"
 32#include "exynos_drm_iommu.h"
 33
 34#define DRIVER_NAME	"exynos"
 35#define DRIVER_DESC	"Samsung SoC DRM"
 36#define DRIVER_DATE	"20110530"
 37#define DRIVER_MAJOR	1
 38#define DRIVER_MINOR	0
 39
 40int exynos_atomic_check(struct drm_device *dev,
 41			struct drm_atomic_state *state)
 42{
 43	int ret;
 44
 45	ret = drm_atomic_helper_check_modeset(dev, state);
 46	if (ret)
 47		return ret;
 48
 49	ret = drm_atomic_normalize_zpos(dev, state);
 50	if (ret)
 51		return ret;
 52
 53	ret = drm_atomic_helper_check_planes(dev, state);
 54	if (ret)
 55		return ret;
 56
 57	return ret;
 58}
 59
 60static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
 61{
 62	struct drm_exynos_file_private *file_priv;
 63	int ret;
 64
 65	file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
 66	if (!file_priv)
 67		return -ENOMEM;
 68
 69	file->driver_priv = file_priv;
 70
 71	ret = exynos_drm_subdrv_open(dev, file);
 72	if (ret)
 73		goto err_file_priv_free;
 74
 75	return ret;
 76
 77err_file_priv_free:
 78	kfree(file_priv);
 79	file->driver_priv = NULL;
 80	return ret;
 81}
 82
 83static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
 84{
 85	exynos_drm_subdrv_close(dev, file);
 86	kfree(file->driver_priv);
 87	file->driver_priv = NULL;
 88}
 89
 90static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
 91	.fault = exynos_drm_gem_fault,
 92	.open = drm_gem_vm_open,
 93	.close = drm_gem_vm_close,
 94};
 95
 96static const struct drm_ioctl_desc exynos_ioctls[] = {
 97	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
 98			DRM_AUTH | DRM_RENDER_ALLOW),
 99	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl,
100			DRM_AUTH | DRM_RENDER_ALLOW),
101	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
102			DRM_RENDER_ALLOW),
103	DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
104			DRM_AUTH),
105	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl,
106			DRM_AUTH | DRM_RENDER_ALLOW),
107	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl,
108			DRM_AUTH | DRM_RENDER_ALLOW),
109	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl,
110			DRM_AUTH | DRM_RENDER_ALLOW),
111};
112
113static const struct file_operations exynos_drm_driver_fops = {
114	.owner		= THIS_MODULE,
115	.open		= drm_open,
116	.mmap		= exynos_drm_gem_mmap,
117	.poll		= drm_poll,
118	.read		= drm_read,
119	.unlocked_ioctl	= drm_ioctl,
120	.compat_ioctl = drm_compat_ioctl,
121	.release	= drm_release,
122};
123
124static struct drm_driver exynos_drm_driver = {
125	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
126				  | DRIVER_ATOMIC | DRIVER_RENDER,
127	.open			= exynos_drm_open,
128	.lastclose		= drm_fb_helper_lastclose,
129	.postclose		= exynos_drm_postclose,
130	.gem_free_object_unlocked = exynos_drm_gem_free_object,
131	.gem_vm_ops		= &exynos_drm_gem_vm_ops,
132	.dumb_create		= exynos_drm_gem_dumb_create,
133	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
134	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
135	.gem_prime_export	= drm_gem_prime_export,
136	.gem_prime_import	= exynos_drm_gem_prime_import,
137	.gem_prime_get_sg_table	= exynos_drm_gem_prime_get_sg_table,
138	.gem_prime_import_sg_table	= exynos_drm_gem_prime_import_sg_table,
139	.gem_prime_vmap		= exynos_drm_gem_prime_vmap,
140	.gem_prime_vunmap	= exynos_drm_gem_prime_vunmap,
141	.gem_prime_mmap		= exynos_drm_gem_prime_mmap,
142	.ioctls			= exynos_ioctls,
143	.num_ioctls		= ARRAY_SIZE(exynos_ioctls),
144	.fops			= &exynos_drm_driver_fops,
145	.name	= DRIVER_NAME,
146	.desc	= DRIVER_DESC,
147	.date	= DRIVER_DATE,
148	.major	= DRIVER_MAJOR,
149	.minor	= DRIVER_MINOR,
150};
151
152#ifdef CONFIG_PM_SLEEP
153static int exynos_drm_suspend(struct device *dev)
154{
155	struct drm_device *drm_dev = dev_get_drvdata(dev);
156	struct exynos_drm_private *private;
157
158	if (pm_runtime_suspended(dev) || !drm_dev)
159		return 0;
160
161	private = drm_dev->dev_private;
162
163	drm_kms_helper_poll_disable(drm_dev);
164	exynos_drm_fbdev_suspend(drm_dev);
165	private->suspend_state = drm_atomic_helper_suspend(drm_dev);
166	if (IS_ERR(private->suspend_state)) {
167		exynos_drm_fbdev_resume(drm_dev);
168		drm_kms_helper_poll_enable(drm_dev);
169		return PTR_ERR(private->suspend_state);
170	}
171
172	return 0;
173}
174
175static int exynos_drm_resume(struct device *dev)
176{
177	struct drm_device *drm_dev = dev_get_drvdata(dev);
178	struct exynos_drm_private *private;
179
180	if (pm_runtime_suspended(dev) || !drm_dev)
181		return 0;
182
183	private = drm_dev->dev_private;
184	drm_atomic_helper_resume(drm_dev, private->suspend_state);
185	exynos_drm_fbdev_resume(drm_dev);
186	drm_kms_helper_poll_enable(drm_dev);
187
188	return 0;
189}
190#endif
191
192static const struct dev_pm_ops exynos_drm_pm_ops = {
193	SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_suspend, exynos_drm_resume)
194};
195
196/* forward declaration */
197static struct platform_driver exynos_drm_platform_driver;
198
199struct exynos_drm_driver_info {
200	struct platform_driver *driver;
201	unsigned int flags;
202};
203
204#define DRM_COMPONENT_DRIVER	BIT(0)	/* supports component framework */
205#define DRM_VIRTUAL_DEVICE	BIT(1)	/* create virtual platform device */
206#define DRM_DMA_DEVICE		BIT(2)	/* can be used for dma allocations */
207
208#define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL)
209
210/*
211 * Connector drivers should not be placed before associated crtc drivers,
212 * because connector requires pipe number of its crtc during initialization.
213 */
214static struct exynos_drm_driver_info exynos_drm_drivers[] = {
215	{
216		DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD),
217		DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
218	}, {
219		DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON),
220		DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
221	}, {
222		DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON),
223		DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
224	}, {
225		DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER),
226		DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
227	}, {
228		DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC),
229		DRM_COMPONENT_DRIVER
230	}, {
231		DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP),
232		DRM_COMPONENT_DRIVER
233	}, {
234		DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI),
235		DRM_COMPONENT_DRIVER
236	}, {
237		DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI),
238		DRM_COMPONENT_DRIVER
239	}, {
240		DRV_PTR(vidi_driver, CONFIG_DRM_EXYNOS_VIDI),
241		DRM_COMPONENT_DRIVER | DRM_VIRTUAL_DEVICE
242	}, {
243		DRV_PTR(g2d_driver, CONFIG_DRM_EXYNOS_G2D),
244	}, {
245		DRV_PTR(fimc_driver, CONFIG_DRM_EXYNOS_FIMC),
246	}, {
247		DRV_PTR(rotator_driver, CONFIG_DRM_EXYNOS_ROTATOR),
248	}, {
249		DRV_PTR(gsc_driver, CONFIG_DRM_EXYNOS_GSC),
250	}, {
251		&exynos_drm_platform_driver,
252		DRM_VIRTUAL_DEVICE
253	}
254};
255
256static int compare_dev(struct device *dev, void *data)
257{
258	return dev == (struct device *)data;
259}
260
261static struct component_match *exynos_drm_match_add(struct device *dev)
262{
263	struct component_match *match = NULL;
264	int i;
265
266	for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
267		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
268		struct device *p = NULL, *d;
269
270		if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))
271			continue;
272
273		while ((d = bus_find_device(&platform_bus_type, p,
274					    &info->driver->driver,
275					    (void *)platform_bus_type.match))) {
276			put_device(p);
277			component_match_add(dev, &match, compare_dev, d);
278			p = d;
279		}
280		put_device(p);
281	}
282
283	return match ?: ERR_PTR(-ENODEV);
284}
285
286static struct device *exynos_drm_get_dma_device(void)
287{
288	int i;
289
290	for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
291		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
292		struct device *dev;
293
294		if (!info->driver || !(info->flags & DRM_DMA_DEVICE))
295			continue;
296
297		while ((dev = bus_find_device(&platform_bus_type, NULL,
298					    &info->driver->driver,
299					    (void *)platform_bus_type.match))) {
300			put_device(dev);
301			return dev;
302		}
303	}
304	return NULL;
305}
306
307static int exynos_drm_bind(struct device *dev)
308{
309	struct exynos_drm_private *private;
310	struct drm_encoder *encoder;
311	struct drm_device *drm;
312	unsigned int clone_mask;
313	int cnt, ret;
314
315	drm = drm_dev_alloc(&exynos_drm_driver, dev);
316	if (IS_ERR(drm))
317		return PTR_ERR(drm);
318
319	private = kzalloc(sizeof(struct exynos_drm_private), GFP_KERNEL);
320	if (!private) {
321		ret = -ENOMEM;
322		goto err_free_drm;
323	}
324
325	init_waitqueue_head(&private->wait);
326	spin_lock_init(&private->lock);
327
328	dev_set_drvdata(dev, drm);
329	drm->dev_private = (void *)private;
330
331	/* the first real CRTC device is used for all dma mapping operations */
332	private->dma_dev = exynos_drm_get_dma_device();
333	if (!private->dma_dev) {
334		DRM_ERROR("no device found for DMA mapping operations.\n");
335		ret = -ENODEV;
336		goto err_free_private;
337	}
338	DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n",
339		 dev_name(private->dma_dev));
340
341	/* create common IOMMU mapping for all devices attached to Exynos DRM */
342	ret = drm_create_iommu_mapping(drm);
343	if (ret < 0) {
344		DRM_ERROR("failed to create iommu mapping.\n");
345		goto err_free_private;
346	}
347
348	drm_mode_config_init(drm);
349
350	exynos_drm_mode_config_init(drm);
351
352	/* setup possible_clones. */
353	cnt = 0;
354	clone_mask = 0;
355	list_for_each_entry(encoder, &drm->mode_config.encoder_list, head)
356		clone_mask |= (1 << (cnt++));
357
358	list_for_each_entry(encoder, &drm->mode_config.encoder_list, head)
359		encoder->possible_clones = clone_mask;
360
361	/* Try to bind all sub drivers. */
362	ret = component_bind_all(drm->dev, drm);
363	if (ret)
364		goto err_mode_config_cleanup;
365
366	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
367	if (ret)
368		goto err_unbind_all;
369
370	/* Probe non kms sub drivers and virtual display driver. */
371	ret = exynos_drm_device_subdrv_probe(drm);
372	if (ret)
373		goto err_unbind_all;
374
375	drm_mode_config_reset(drm);
376
377	/*
378	 * enable drm irq mode.
379	 * - with irq_enabled = true, we can use the vblank feature.
380	 *
381	 * P.S. note that we wouldn't use drm irq handler but
382	 *	just specific driver own one instead because
383	 *	drm framework supports only one irq handler.
384	 */
385	drm->irq_enabled = true;
386
387	/* init kms poll for handling hpd */
388	drm_kms_helper_poll_init(drm);
389
390	ret = exynos_drm_fbdev_init(drm);
391	if (ret)
392		goto err_cleanup_poll;
393
394	/* register the DRM device */
395	ret = drm_dev_register(drm, 0);
396	if (ret < 0)
397		goto err_cleanup_fbdev;
398
399	return 0;
400
401err_cleanup_fbdev:
402	exynos_drm_fbdev_fini(drm);
403err_cleanup_poll:
404	drm_kms_helper_poll_fini(drm);
405	exynos_drm_device_subdrv_remove(drm);
406err_unbind_all:
407	component_unbind_all(drm->dev, drm);
408err_mode_config_cleanup:
409	drm_mode_config_cleanup(drm);
410	drm_release_iommu_mapping(drm);
411err_free_private:
412	kfree(private);
413err_free_drm:
414	drm_dev_unref(drm);
415
416	return ret;
417}
418
419static void exynos_drm_unbind(struct device *dev)
420{
421	struct drm_device *drm = dev_get_drvdata(dev);
422
423	drm_dev_unregister(drm);
424
425	exynos_drm_device_subdrv_remove(drm);
426
427	exynos_drm_fbdev_fini(drm);
428	drm_kms_helper_poll_fini(drm);
429
430	component_unbind_all(drm->dev, drm);
431	drm_mode_config_cleanup(drm);
432	drm_release_iommu_mapping(drm);
433
434	kfree(drm->dev_private);
435	drm->dev_private = NULL;
436	dev_set_drvdata(dev, NULL);
437
438	drm_dev_unref(drm);
439}
440
441static const struct component_master_ops exynos_drm_ops = {
442	.bind		= exynos_drm_bind,
443	.unbind		= exynos_drm_unbind,
444};
445
446static int exynos_drm_platform_probe(struct platform_device *pdev)
447{
448	struct component_match *match;
449
450	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
451
452	match = exynos_drm_match_add(&pdev->dev);
453	if (IS_ERR(match))
454		return PTR_ERR(match);
455
456	return component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
457					       match);
458}
459
460static int exynos_drm_platform_remove(struct platform_device *pdev)
461{
462	component_master_del(&pdev->dev, &exynos_drm_ops);
463	return 0;
464}
465
466static struct platform_driver exynos_drm_platform_driver = {
467	.probe	= exynos_drm_platform_probe,
468	.remove	= exynos_drm_platform_remove,
469	.driver	= {
470		.name	= "exynos-drm",
471		.pm	= &exynos_drm_pm_ops,
472	},
473};
474
475static void exynos_drm_unregister_devices(void)
476{
477	int i;
478
479	for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
480		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
481		struct device *dev;
482
483		if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
484			continue;
485
486		while ((dev = bus_find_device(&platform_bus_type, NULL,
487					    &info->driver->driver,
488					    (void *)platform_bus_type.match))) {
489			put_device(dev);
490			platform_device_unregister(to_platform_device(dev));
491		}
492	}
493}
494
495static int exynos_drm_register_devices(void)
496{
497	struct platform_device *pdev;
498	int i;
499
500	for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
501		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
502
503		if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
504			continue;
505
506		pdev = platform_device_register_simple(
507					info->driver->driver.name, -1, NULL, 0);
508		if (IS_ERR(pdev))
509			goto fail;
510	}
511
512	return 0;
513fail:
514	exynos_drm_unregister_devices();
515	return PTR_ERR(pdev);
516}
517
518static void exynos_drm_unregister_drivers(void)
519{
520	int i;
521
522	for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
523		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
524
525		if (!info->driver)
526			continue;
527
528		platform_driver_unregister(info->driver);
529	}
530}
531
532static int exynos_drm_register_drivers(void)
533{
534	int i, ret;
535
536	for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
537		struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
538
539		if (!info->driver)
540			continue;
541
542		ret = platform_driver_register(info->driver);
543		if (ret)
544			goto fail;
545	}
546	return 0;
547fail:
548	exynos_drm_unregister_drivers();
549	return ret;
550}
551
552static int exynos_drm_init(void)
553{
554	int ret;
555
556	ret = exynos_drm_register_devices();
557	if (ret)
558		return ret;
559
560	ret = exynos_drm_register_drivers();
561	if (ret)
562		goto err_unregister_pdevs;
563
564	return 0;
565
566err_unregister_pdevs:
567	exynos_drm_unregister_devices();
568
569	return ret;
570}
571
572static void exynos_drm_exit(void)
573{
574	exynos_drm_unregister_drivers();
575	exynos_drm_unregister_devices();
576}
577
578module_init(exynos_drm_init);
579module_exit(exynos_drm_exit);
580
581MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
582MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
583MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
584MODULE_DESCRIPTION("Samsung SoC DRM Driver");
585MODULE_LICENSE("GPL");