xref: /linux/drivers/gpu/drm/rockchip/rockchip_drm_drv.c (revision 0883c2c06fb5bcf5b9e008270827e63c09a88c1e)
1 /*
2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3  * Author:Mark Yao <mark.yao@rock-chips.com>
4  *
5  * based on exynos_drm_drv.c
6  *
7  * This software is licensed under the terms of the GNU General Public
8  * License version 2, as published by the Free Software Foundation, and
9  * may be copied, distributed, and modified under those terms.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  */
16 
17 #include <asm/dma-iommu.h>
18 
19 #include <drm/drmP.h>
20 #include <drm/drm_crtc_helper.h>
21 #include <drm/drm_fb_helper.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/module.h>
25 #include <linux/of_graph.h>
26 #include <linux/component.h>
27 
28 #include "rockchip_drm_drv.h"
29 #include "rockchip_drm_fb.h"
30 #include "rockchip_drm_fbdev.h"
31 #include "rockchip_drm_gem.h"
32 
33 #define DRIVER_NAME	"rockchip"
34 #define DRIVER_DESC	"RockChip Soc DRM"
35 #define DRIVER_DATE	"20140818"
36 #define DRIVER_MAJOR	1
37 #define DRIVER_MINOR	0
38 
39 static bool is_support_iommu = true;
40 
41 /*
42  * Attach a (component) device to the shared drm dma mapping from master drm
43  * device.  This is used by the VOPs to map GEM buffers to a common DMA
44  * mapping.
45  */
46 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
47 				   struct device *dev)
48 {
49 	struct dma_iommu_mapping *mapping = drm_dev->dev->archdata.mapping;
50 	int ret;
51 
52 	if (!is_support_iommu)
53 		return 0;
54 
55 	ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
56 	if (ret)
57 		return ret;
58 
59 	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
60 
61 	return arm_iommu_attach_device(dev, mapping);
62 }
63 
64 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
65 				    struct device *dev)
66 {
67 	if (!is_support_iommu)
68 		return;
69 
70 	arm_iommu_detach_device(dev);
71 }
72 
73 int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
74 				 const struct rockchip_crtc_funcs *crtc_funcs)
75 {
76 	int pipe = drm_crtc_index(crtc);
77 	struct rockchip_drm_private *priv = crtc->dev->dev_private;
78 
79 	if (pipe > ROCKCHIP_MAX_CRTC)
80 		return -EINVAL;
81 
82 	priv->crtc_funcs[pipe] = crtc_funcs;
83 
84 	return 0;
85 }
86 
87 void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc)
88 {
89 	int pipe = drm_crtc_index(crtc);
90 	struct rockchip_drm_private *priv = crtc->dev->dev_private;
91 
92 	if (pipe > ROCKCHIP_MAX_CRTC)
93 		return;
94 
95 	priv->crtc_funcs[pipe] = NULL;
96 }
97 
98 static struct drm_crtc *rockchip_crtc_from_pipe(struct drm_device *drm,
99 						int pipe)
100 {
101 	struct drm_crtc *crtc;
102 	int i = 0;
103 
104 	list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
105 		if (i++ == pipe)
106 			return crtc;
107 
108 	return NULL;
109 }
110 
111 static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev,
112 					   unsigned int pipe)
113 {
114 	struct rockchip_drm_private *priv = dev->dev_private;
115 	struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
116 
117 	if (crtc && priv->crtc_funcs[pipe] &&
118 	    priv->crtc_funcs[pipe]->enable_vblank)
119 		return priv->crtc_funcs[pipe]->enable_vblank(crtc);
120 
121 	return 0;
122 }
123 
124 static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
125 					     unsigned int pipe)
126 {
127 	struct rockchip_drm_private *priv = dev->dev_private;
128 	struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
129 
130 	if (crtc && priv->crtc_funcs[pipe] &&
131 	    priv->crtc_funcs[pipe]->enable_vblank)
132 		priv->crtc_funcs[pipe]->disable_vblank(crtc);
133 }
134 
135 static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
136 {
137 	struct rockchip_drm_private *private;
138 	struct dma_iommu_mapping *mapping = NULL;
139 	struct device *dev = drm_dev->dev;
140 	struct drm_connector *connector;
141 	int ret;
142 
143 	private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
144 	if (!private)
145 		return -ENOMEM;
146 
147 	mutex_init(&private->commit.lock);
148 	INIT_WORK(&private->commit.work, rockchip_drm_atomic_work);
149 
150 	drm_dev->dev_private = private;
151 
152 	drm_mode_config_init(drm_dev);
153 
154 	rockchip_drm_mode_config_init(drm_dev);
155 
156 	dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
157 				      GFP_KERNEL);
158 	if (!dev->dma_parms) {
159 		ret = -ENOMEM;
160 		goto err_config_cleanup;
161 	}
162 
163 	if (is_support_iommu) {
164 		/* TODO(djkurtz): fetch the mapping start/size from somewhere */
165 		mapping = arm_iommu_create_mapping(&platform_bus_type,
166 						   0x00000000,
167 						   SZ_2G);
168 		if (IS_ERR(mapping)) {
169 			ret = PTR_ERR(mapping);
170 			goto err_config_cleanup;
171 		}
172 
173 		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
174 		if (ret)
175 			goto err_release_mapping;
176 
177 		dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
178 
179 		ret = arm_iommu_attach_device(dev, mapping);
180 		if (ret)
181 			goto err_release_mapping;
182 	}
183 
184 	/* Try to bind all sub drivers. */
185 	ret = component_bind_all(dev, drm_dev);
186 	if (ret)
187 		goto err_detach_device;
188 
189 	/*
190 	 * All components are now added, we can publish the connector sysfs
191 	 * entries to userspace.  This will generate hotplug events and so
192 	 * userspace will expect to be able to access DRM at this point.
193 	 */
194 	list_for_each_entry(connector, &drm_dev->mode_config.connector_list,
195 			head) {
196 		ret = drm_connector_register(connector);
197 		if (ret) {
198 			dev_err(drm_dev->dev,
199 				"[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
200 				connector->base.id,
201 				connector->name, ret);
202 			goto err_unbind;
203 		}
204 	}
205 
206 	/* init kms poll for handling hpd */
207 	drm_kms_helper_poll_init(drm_dev);
208 
209 	/*
210 	 * enable drm irq mode.
211 	 * - with irq_enabled = true, we can use the vblank feature.
212 	 */
213 	drm_dev->irq_enabled = true;
214 
215 	ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
216 	if (ret)
217 		goto err_kms_helper_poll_fini;
218 
219 	drm_mode_config_reset(drm_dev);
220 
221 	ret = rockchip_drm_fbdev_init(drm_dev);
222 	if (ret)
223 		goto err_vblank_cleanup;
224 
225 	if (is_support_iommu)
226 		arm_iommu_release_mapping(mapping);
227 	return 0;
228 err_vblank_cleanup:
229 	drm_vblank_cleanup(drm_dev);
230 err_kms_helper_poll_fini:
231 	drm_kms_helper_poll_fini(drm_dev);
232 err_unbind:
233 	component_unbind_all(dev, drm_dev);
234 err_detach_device:
235 	if (is_support_iommu)
236 		arm_iommu_detach_device(dev);
237 err_release_mapping:
238 	if (is_support_iommu)
239 		arm_iommu_release_mapping(mapping);
240 err_config_cleanup:
241 	drm_mode_config_cleanup(drm_dev);
242 	drm_dev->dev_private = NULL;
243 	return ret;
244 }
245 
246 static int rockchip_drm_unload(struct drm_device *drm_dev)
247 {
248 	struct device *dev = drm_dev->dev;
249 
250 	rockchip_drm_fbdev_fini(drm_dev);
251 	drm_vblank_cleanup(drm_dev);
252 	drm_kms_helper_poll_fini(drm_dev);
253 	component_unbind_all(dev, drm_dev);
254 	if (is_support_iommu)
255 		arm_iommu_detach_device(dev);
256 	drm_mode_config_cleanup(drm_dev);
257 	drm_dev->dev_private = NULL;
258 
259 	return 0;
260 }
261 
262 static void rockchip_drm_crtc_cancel_pending_vblank(struct drm_crtc *crtc,
263 						    struct drm_file *file_priv)
264 {
265 	struct rockchip_drm_private *priv = crtc->dev->dev_private;
266 	int pipe = drm_crtc_index(crtc);
267 
268 	if (pipe < ROCKCHIP_MAX_CRTC &&
269 	    priv->crtc_funcs[pipe] &&
270 	    priv->crtc_funcs[pipe]->cancel_pending_vblank)
271 		priv->crtc_funcs[pipe]->cancel_pending_vblank(crtc, file_priv);
272 }
273 
274 static void rockchip_drm_preclose(struct drm_device *dev,
275 				  struct drm_file *file_priv)
276 {
277 	struct drm_crtc *crtc;
278 
279 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
280 		rockchip_drm_crtc_cancel_pending_vblank(crtc, file_priv);
281 }
282 
283 void rockchip_drm_lastclose(struct drm_device *dev)
284 {
285 	struct rockchip_drm_private *priv = dev->dev_private;
286 
287 	drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
288 }
289 
290 static const struct file_operations rockchip_drm_driver_fops = {
291 	.owner = THIS_MODULE,
292 	.open = drm_open,
293 	.mmap = rockchip_gem_mmap,
294 	.poll = drm_poll,
295 	.read = drm_read,
296 	.unlocked_ioctl = drm_ioctl,
297 #ifdef CONFIG_COMPAT
298 	.compat_ioctl = drm_compat_ioctl,
299 #endif
300 	.release = drm_release,
301 };
302 
303 const struct vm_operations_struct rockchip_drm_vm_ops = {
304 	.open = drm_gem_vm_open,
305 	.close = drm_gem_vm_close,
306 };
307 
308 static struct drm_driver rockchip_drm_driver = {
309 	.driver_features	= DRIVER_MODESET | DRIVER_GEM |
310 				  DRIVER_PRIME | DRIVER_ATOMIC,
311 	.load			= rockchip_drm_load,
312 	.unload			= rockchip_drm_unload,
313 	.preclose		= rockchip_drm_preclose,
314 	.lastclose		= rockchip_drm_lastclose,
315 	.get_vblank_counter	= drm_vblank_no_hw_counter,
316 	.enable_vblank		= rockchip_drm_crtc_enable_vblank,
317 	.disable_vblank		= rockchip_drm_crtc_disable_vblank,
318 	.gem_vm_ops		= &rockchip_drm_vm_ops,
319 	.gem_free_object	= rockchip_gem_free_object,
320 	.dumb_create		= rockchip_gem_dumb_create,
321 	.dumb_map_offset	= rockchip_gem_dumb_map_offset,
322 	.dumb_destroy		= drm_gem_dumb_destroy,
323 	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
324 	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
325 	.gem_prime_import	= drm_gem_prime_import,
326 	.gem_prime_export	= drm_gem_prime_export,
327 	.gem_prime_get_sg_table	= rockchip_gem_prime_get_sg_table,
328 	.gem_prime_vmap		= rockchip_gem_prime_vmap,
329 	.gem_prime_vunmap	= rockchip_gem_prime_vunmap,
330 	.gem_prime_mmap		= rockchip_gem_mmap_buf,
331 	.fops			= &rockchip_drm_driver_fops,
332 	.name	= DRIVER_NAME,
333 	.desc	= DRIVER_DESC,
334 	.date	= DRIVER_DATE,
335 	.major	= DRIVER_MAJOR,
336 	.minor	= DRIVER_MINOR,
337 };
338 
339 #ifdef CONFIG_PM_SLEEP
340 static int rockchip_drm_sys_suspend(struct device *dev)
341 {
342 	struct drm_device *drm = dev_get_drvdata(dev);
343 	struct drm_connector *connector;
344 
345 	if (!drm)
346 		return 0;
347 
348 	drm_modeset_lock_all(drm);
349 	list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
350 		int old_dpms = connector->dpms;
351 
352 		if (connector->funcs->dpms)
353 			connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
354 
355 		/* Set the old mode back to the connector for resume */
356 		connector->dpms = old_dpms;
357 	}
358 	drm_modeset_unlock_all(drm);
359 
360 	return 0;
361 }
362 
363 static int rockchip_drm_sys_resume(struct device *dev)
364 {
365 	struct drm_device *drm = dev_get_drvdata(dev);
366 	struct drm_connector *connector;
367 	enum drm_connector_status status;
368 	bool changed = false;
369 
370 	if (!drm)
371 		return 0;
372 
373 	drm_modeset_lock_all(drm);
374 	list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
375 		int desired_mode = connector->dpms;
376 
377 		/*
378 		 * at suspend time, we save dpms to connector->dpms,
379 		 * restore the old_dpms, and at current time, the connector
380 		 * dpms status must be DRM_MODE_DPMS_OFF.
381 		 */
382 		connector->dpms = DRM_MODE_DPMS_OFF;
383 
384 		/*
385 		 * If the connector has been disconnected during suspend,
386 		 * disconnect it from the encoder and leave it off. We'll notify
387 		 * userspace at the end.
388 		 */
389 		if (desired_mode == DRM_MODE_DPMS_ON) {
390 			status = connector->funcs->detect(connector, true);
391 			if (status == connector_status_disconnected) {
392 				connector->encoder = NULL;
393 				connector->status = status;
394 				changed = true;
395 				continue;
396 			}
397 		}
398 		if (connector->funcs->dpms)
399 			connector->funcs->dpms(connector, desired_mode);
400 	}
401 	drm_modeset_unlock_all(drm);
402 
403 	drm_helper_resume_force_mode(drm);
404 
405 	if (changed)
406 		drm_kms_helper_hotplug_event(drm);
407 
408 	return 0;
409 }
410 #endif
411 
412 static const struct dev_pm_ops rockchip_drm_pm_ops = {
413 	SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
414 				rockchip_drm_sys_resume)
415 };
416 
417 static int compare_of(struct device *dev, void *data)
418 {
419 	struct device_node *np = data;
420 
421 	return dev->of_node == np;
422 }
423 
424 static void rockchip_add_endpoints(struct device *dev,
425 				   struct component_match **match,
426 				   struct device_node *port)
427 {
428 	struct device_node *ep, *remote;
429 
430 	for_each_child_of_node(port, ep) {
431 		remote = of_graph_get_remote_port_parent(ep);
432 		if (!remote || !of_device_is_available(remote)) {
433 			of_node_put(remote);
434 			continue;
435 		} else if (!of_device_is_available(remote->parent)) {
436 			dev_warn(dev, "parent device of %s is not available\n",
437 				 remote->full_name);
438 			of_node_put(remote);
439 			continue;
440 		}
441 
442 		component_match_add(dev, match, compare_of, remote);
443 		of_node_put(remote);
444 	}
445 }
446 
447 static int rockchip_drm_bind(struct device *dev)
448 {
449 	struct drm_device *drm;
450 	int ret;
451 
452 	drm = drm_dev_alloc(&rockchip_drm_driver, dev);
453 	if (!drm)
454 		return -ENOMEM;
455 
456 	ret = drm_dev_register(drm, 0);
457 	if (ret)
458 		goto err_free;
459 
460 	dev_set_drvdata(dev, drm);
461 
462 	return 0;
463 
464 err_free:
465 	drm_dev_unref(drm);
466 	return ret;
467 }
468 
469 static void rockchip_drm_unbind(struct device *dev)
470 {
471 	struct drm_device *drm = dev_get_drvdata(dev);
472 
473 	drm_dev_unregister(drm);
474 	drm_dev_unref(drm);
475 	dev_set_drvdata(dev, NULL);
476 }
477 
478 static const struct component_master_ops rockchip_drm_ops = {
479 	.bind = rockchip_drm_bind,
480 	.unbind = rockchip_drm_unbind,
481 };
482 
483 static int rockchip_drm_platform_probe(struct platform_device *pdev)
484 {
485 	struct device *dev = &pdev->dev;
486 	struct component_match *match = NULL;
487 	struct device_node *np = dev->of_node;
488 	struct device_node *port;
489 	int i;
490 
491 	if (!np)
492 		return -ENODEV;
493 	/*
494 	 * Bind the crtc ports first, so that
495 	 * drm_of_find_possible_crtcs called from encoder .bind callbacks
496 	 * works as expected.
497 	 */
498 	for (i = 0;; i++) {
499 		struct device_node *iommu;
500 
501 		port = of_parse_phandle(np, "ports", i);
502 		if (!port)
503 			break;
504 
505 		if (!of_device_is_available(port->parent)) {
506 			of_node_put(port);
507 			continue;
508 		}
509 
510 		iommu = of_parse_phandle(port->parent, "iommus", 0);
511 		if (!iommu || !of_device_is_available(iommu->parent)) {
512 			dev_dbg(dev, "no iommu attached for %s, using non-iommu buffers\n",
513 				port->parent->full_name);
514 			/*
515 			 * if there is a crtc not support iommu, force set all
516 			 * crtc use non-iommu buffer.
517 			 */
518 			is_support_iommu = false;
519 		}
520 
521 		component_match_add(dev, &match, compare_of, port->parent);
522 		of_node_put(port);
523 	}
524 
525 	if (i == 0) {
526 		dev_err(dev, "missing 'ports' property\n");
527 		return -ENODEV;
528 	}
529 
530 	if (!match) {
531 		dev_err(dev, "No available vop found for display-subsystem.\n");
532 		return -ENODEV;
533 	}
534 	/*
535 	 * For each bound crtc, bind the encoders attached to its
536 	 * remote endpoint.
537 	 */
538 	for (i = 0;; i++) {
539 		port = of_parse_phandle(np, "ports", i);
540 		if (!port)
541 			break;
542 
543 		if (!of_device_is_available(port->parent)) {
544 			of_node_put(port);
545 			continue;
546 		}
547 
548 		rockchip_add_endpoints(dev, &match, port);
549 		of_node_put(port);
550 	}
551 
552 	return component_master_add_with_match(dev, &rockchip_drm_ops, match);
553 }
554 
555 static int rockchip_drm_platform_remove(struct platform_device *pdev)
556 {
557 	component_master_del(&pdev->dev, &rockchip_drm_ops);
558 
559 	return 0;
560 }
561 
562 static const struct of_device_id rockchip_drm_dt_ids[] = {
563 	{ .compatible = "rockchip,display-subsystem", },
564 	{ /* sentinel */ },
565 };
566 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
567 
568 static struct platform_driver rockchip_drm_platform_driver = {
569 	.probe = rockchip_drm_platform_probe,
570 	.remove = rockchip_drm_platform_remove,
571 	.driver = {
572 		.name = "rockchip-drm",
573 		.of_match_table = rockchip_drm_dt_ids,
574 		.pm = &rockchip_drm_pm_ops,
575 	},
576 };
577 
578 module_platform_driver(rockchip_drm_platform_driver);
579 
580 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
581 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
582 MODULE_LICENSE("GPL v2");
583