xref: /openbmc/linux/drivers/gpu/drm/sun4i/sun4i_drv.c (revision d665e3c9)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2015 Free Electrons
4  * Copyright (C) 2015 NextThing Co
5  *
6  * Maxime Ripard <maxime.ripard@free-electrons.com>
7  */
8 
9 #include <linux/component.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/kfifo.h>
12 #include <linux/module.h>
13 #include <linux/of_graph.h>
14 #include <linux/of_reserved_mem.h>
15 #include <linux/platform_device.h>
16 
17 #include <drm/drm_aperture.h>
18 #include <drm/drm_atomic_helper.h>
19 #include <drm/drm_drv.h>
20 #include <drm/drm_fbdev_dma.h>
21 #include <drm/drm_gem_dma_helper.h>
22 #include <drm/drm_module.h>
23 #include <drm/drm_of.h>
24 #include <drm/drm_probe_helper.h>
25 #include <drm/drm_vblank.h>
26 
27 #include "sun4i_drv.h"
28 #include "sun4i_frontend.h"
29 #include "sun4i_framebuffer.h"
30 #include "sun4i_tcon.h"
31 #include "sun8i_tcon_top.h"
32 
drm_sun4i_gem_dumb_create(struct drm_file * file_priv,struct drm_device * drm,struct drm_mode_create_dumb * args)33 static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv,
34 				     struct drm_device *drm,
35 				     struct drm_mode_create_dumb *args)
36 {
37 	/* The hardware only allows even pitches for YUV buffers. */
38 	args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2);
39 
40 	return drm_gem_dma_dumb_create_internal(file_priv, drm, args);
41 }
42 
43 DEFINE_DRM_GEM_DMA_FOPS(sun4i_drv_fops);
44 
45 static const struct drm_driver sun4i_drv_driver = {
46 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
47 
48 	/* Generic Operations */
49 	.fops			= &sun4i_drv_fops,
50 	.name			= "sun4i-drm",
51 	.desc			= "Allwinner sun4i Display Engine",
52 	.date			= "20150629",
53 	.major			= 1,
54 	.minor			= 0,
55 
56 	/* GEM Operations */
57 	DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_sun4i_gem_dumb_create),
58 };
59 
sun4i_drv_bind(struct device * dev)60 static int sun4i_drv_bind(struct device *dev)
61 {
62 	struct drm_device *drm;
63 	struct sun4i_drv *drv;
64 	int ret;
65 
66 	drm = drm_dev_alloc(&sun4i_drv_driver, dev);
67 	if (IS_ERR(drm))
68 		return PTR_ERR(drm);
69 
70 	drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
71 	if (!drv) {
72 		ret = -ENOMEM;
73 		goto free_drm;
74 	}
75 
76 	drm->dev_private = drv;
77 	INIT_LIST_HEAD(&drv->frontend_list);
78 	INIT_LIST_HEAD(&drv->engine_list);
79 	INIT_LIST_HEAD(&drv->tcon_list);
80 
81 	ret = of_reserved_mem_device_init(dev);
82 	if (ret && ret != -ENODEV) {
83 		dev_err(drm->dev, "Couldn't claim our memory region\n");
84 		goto free_drm;
85 	}
86 
87 	drm_mode_config_init(drm);
88 
89 	ret = component_bind_all(drm->dev, drm);
90 	if (ret) {
91 		dev_err(drm->dev, "Couldn't bind all pipelines components\n");
92 		goto cleanup_mode_config;
93 	}
94 
95 	/* drm_vblank_init calls kcalloc, which can fail */
96 	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
97 	if (ret)
98 		goto unbind_all;
99 
100 	/* Remove early framebuffers (ie. simplefb) */
101 	ret = drm_aperture_remove_framebuffers(&sun4i_drv_driver);
102 	if (ret)
103 		goto unbind_all;
104 
105 	sun4i_framebuffer_init(drm);
106 
107 	/* Enable connectors polling */
108 	drm_kms_helper_poll_init(drm);
109 
110 	ret = drm_dev_register(drm, 0);
111 	if (ret)
112 		goto finish_poll;
113 
114 	drm_fbdev_dma_setup(drm, 32);
115 
116 	dev_set_drvdata(dev, drm);
117 
118 	return 0;
119 
120 finish_poll:
121 	drm_kms_helper_poll_fini(drm);
122 unbind_all:
123 	component_unbind_all(dev, NULL);
124 cleanup_mode_config:
125 	drm_mode_config_cleanup(drm);
126 	of_reserved_mem_device_release(dev);
127 free_drm:
128 	drm_dev_put(drm);
129 	return ret;
130 }
131 
sun4i_drv_unbind(struct device * dev)132 static void sun4i_drv_unbind(struct device *dev)
133 {
134 	struct drm_device *drm = dev_get_drvdata(dev);
135 
136 	dev_set_drvdata(dev, NULL);
137 	drm_dev_unregister(drm);
138 	drm_kms_helper_poll_fini(drm);
139 	drm_atomic_helper_shutdown(drm);
140 	drm_mode_config_cleanup(drm);
141 
142 	component_unbind_all(dev, NULL);
143 	of_reserved_mem_device_release(dev);
144 
145 	drm_dev_put(drm);
146 }
147 
148 static const struct component_master_ops sun4i_drv_master_ops = {
149 	.bind	= sun4i_drv_bind,
150 	.unbind	= sun4i_drv_unbind,
151 };
152 
sun4i_drv_node_is_connector(struct device_node * node)153 static bool sun4i_drv_node_is_connector(struct device_node *node)
154 {
155 	return of_device_is_compatible(node, "hdmi-connector");
156 }
157 
sun4i_drv_node_is_frontend(struct device_node * node)158 static bool sun4i_drv_node_is_frontend(struct device_node *node)
159 {
160 	return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
161 		of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
162 		of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
163 		of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
164 		of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||
165 		of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
166 		of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
167 }
168 
sun4i_drv_node_is_deu(struct device_node * node)169 static bool sun4i_drv_node_is_deu(struct device_node *node)
170 {
171 	return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
172 }
173 
sun4i_drv_node_is_supported_frontend(struct device_node * node)174 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
175 {
176 	if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
177 		return !!of_match_node(sun4i_frontend_of_table, node);
178 
179 	return false;
180 }
181 
sun4i_drv_node_is_tcon(struct device_node * node)182 static bool sun4i_drv_node_is_tcon(struct device_node *node)
183 {
184 	return !!of_match_node(sun4i_tcon_of_table, node);
185 }
186 
sun4i_drv_node_is_tcon_with_ch0(struct device_node * node)187 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
188 {
189 	const struct of_device_id *match;
190 
191 	match = of_match_node(sun4i_tcon_of_table, node);
192 	if (match) {
193 		struct sun4i_tcon_quirks *quirks;
194 
195 		quirks = (struct sun4i_tcon_quirks *)match->data;
196 
197 		return quirks->has_channel_0;
198 	}
199 
200 	return false;
201 }
202 
sun4i_drv_node_is_tcon_top(struct device_node * node)203 static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
204 {
205 	return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
206 		!!of_match_node(sun8i_tcon_top_of_table, node);
207 }
208 
209 /*
210  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
211  * crtcs from the device tree using of_graph. For the results to be
212  * correct, encoders must be probed/bound after _all_ crtcs have been
213  * created. The existing code uses a depth first recursive traversal
214  * of the of_graph, which means the encoders downstream of the TCON
215  * get add right after the first TCON. The second TCON or CRTC will
216  * never be properly associated with encoders connected to it.
217  *
218  * Also, in a dual display pipeline setup, both frontends can feed
219  * either backend, and both backends can feed either TCON, we want
220  * all components of the same type to be added before the next type
221  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
222  * i.e. components of the same type are at the same depth when counted
223  * from the frontend. The only exception is the third pipeline in
224  * the A80 SoC, which we do not support anyway.
225  *
226  * Hence we can use a breadth first search traversal order to add
227  * components. We do not need to check for duplicates. The component
228  * matching system handles this for us.
229  */
230 struct endpoint_list {
231 	DECLARE_KFIFO(fifo, struct device_node *, 16);
232 };
233 
sun4i_drv_traverse_endpoints(struct endpoint_list * list,struct device_node * node,int port_id)234 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
235 					 struct device_node *node,
236 					 int port_id)
237 {
238 	struct device_node *ep, *remote, *port;
239 
240 	port = of_graph_get_port_by_id(node, port_id);
241 	if (!port) {
242 		DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
243 		return;
244 	}
245 
246 	for_each_available_child_of_node(port, ep) {
247 		remote = of_graph_get_remote_port_parent(ep);
248 		if (!remote) {
249 			DRM_DEBUG_DRIVER("Error retrieving the output node\n");
250 			continue;
251 		}
252 
253 		if (sun4i_drv_node_is_tcon(node)) {
254 			/*
255 			 * TCON TOP is always probed before TCON. However, TCON
256 			 * points back to TCON TOP when it is source for HDMI.
257 			 * We have to skip it here to prevent infinite looping
258 			 * between TCON TOP and TCON.
259 			 */
260 			if (sun4i_drv_node_is_tcon_top(remote)) {
261 				DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
262 				of_node_put(remote);
263 				continue;
264 			}
265 
266 			/*
267 			 * If the node is our TCON with channel 0, the first
268 			 * port is used for panel or bridges, and will not be
269 			 * part of the component framework.
270 			 */
271 			if (sun4i_drv_node_is_tcon_with_ch0(node)) {
272 				struct of_endpoint endpoint;
273 
274 				if (of_graph_parse_endpoint(ep, &endpoint)) {
275 					DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
276 					of_node_put(remote);
277 					continue;
278 				}
279 
280 				if (!endpoint.id) {
281 					DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
282 					of_node_put(remote);
283 					continue;
284 				}
285 			}
286 		}
287 
288 		kfifo_put(&list->fifo, remote);
289 	}
290 }
291 
sun4i_drv_add_endpoints(struct device * dev,struct endpoint_list * list,struct component_match ** match,struct device_node * node)292 static int sun4i_drv_add_endpoints(struct device *dev,
293 				   struct endpoint_list *list,
294 				   struct component_match **match,
295 				   struct device_node *node)
296 {
297 	int count = 0;
298 
299 	/*
300 	 * The frontend has been disabled in some of our old device
301 	 * trees. If we find a node that is the frontend and is
302 	 * disabled, we should just follow through and parse its
303 	 * child, but without adding it to the component list.
304 	 * Otherwise, we obviously want to add it to the list.
305 	 */
306 	if (!sun4i_drv_node_is_frontend(node) &&
307 	    !of_device_is_available(node))
308 		return 0;
309 
310 	/*
311 	 * The connectors will be the last nodes in our pipeline, we
312 	 * can just bail out.
313 	 */
314 	if (sun4i_drv_node_is_connector(node))
315 		return 0;
316 
317 	/*
318 	 * If the device is either just a regular device, or an
319 	 * enabled frontend supported by the driver, we add it to our
320 	 * component list.
321 	 */
322 	if (!(sun4i_drv_node_is_frontend(node) ||
323 	      sun4i_drv_node_is_deu(node)) ||
324 	    (sun4i_drv_node_is_supported_frontend(node) &&
325 	     of_device_is_available(node))) {
326 		/* Add current component */
327 		DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
328 		drm_of_component_match_add(dev, match, component_compare_of, node);
329 		count++;
330 	}
331 
332 	/* each node has at least one output */
333 	sun4i_drv_traverse_endpoints(list, node, 1);
334 
335 	/* TCON TOP has second and third output */
336 	if (sun4i_drv_node_is_tcon_top(node)) {
337 		sun4i_drv_traverse_endpoints(list, node, 3);
338 		sun4i_drv_traverse_endpoints(list, node, 5);
339 	}
340 
341 	return count;
342 }
343 
344 #ifdef CONFIG_PM_SLEEP
sun4i_drv_drm_sys_suspend(struct device * dev)345 static int sun4i_drv_drm_sys_suspend(struct device *dev)
346 {
347 	struct drm_device *drm = dev_get_drvdata(dev);
348 
349 	return drm_mode_config_helper_suspend(drm);
350 }
351 
sun4i_drv_drm_sys_resume(struct device * dev)352 static int sun4i_drv_drm_sys_resume(struct device *dev)
353 {
354 	struct drm_device *drm = dev_get_drvdata(dev);
355 
356 	return drm_mode_config_helper_resume(drm);
357 }
358 #endif
359 
360 static const struct dev_pm_ops sun4i_drv_drm_pm_ops = {
361 	SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend,
362 				sun4i_drv_drm_sys_resume)
363 };
364 
sun4i_drv_probe(struct platform_device * pdev)365 static int sun4i_drv_probe(struct platform_device *pdev)
366 {
367 	struct component_match *match = NULL;
368 	struct device_node *np = pdev->dev.of_node, *endpoint;
369 	struct endpoint_list list;
370 	int i, ret, count = 0;
371 
372 	INIT_KFIFO(list.fifo);
373 
374 	/*
375 	 * DE2 and DE3 cores actually supports 40-bit addresses, but
376 	 * driver does not.
377 	 */
378 	dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
379 	dma_set_max_seg_size(&pdev->dev, UINT_MAX);
380 
381 	for (i = 0;; i++) {
382 		struct device_node *pipeline = of_parse_phandle(np,
383 								"allwinner,pipelines",
384 								i);
385 		if (!pipeline)
386 			break;
387 
388 		kfifo_put(&list.fifo, pipeline);
389 	}
390 
391 	while (kfifo_get(&list.fifo, &endpoint)) {
392 		/* process this endpoint */
393 		ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
394 					      endpoint);
395 
396 		/* sun4i_drv_add_endpoints can fail to allocate memory */
397 		if (ret < 0)
398 			return ret;
399 
400 		count += ret;
401 	}
402 
403 	if (count)
404 		return component_master_add_with_match(&pdev->dev,
405 						       &sun4i_drv_master_ops,
406 						       match);
407 	else
408 		return 0;
409 }
410 
sun4i_drv_remove(struct platform_device * pdev)411 static void sun4i_drv_remove(struct platform_device *pdev)
412 {
413 	component_master_del(&pdev->dev, &sun4i_drv_master_ops);
414 }
415 
416 static const struct of_device_id sun4i_drv_of_table[] = {
417 	{ .compatible = "allwinner,sun4i-a10-display-engine" },
418 	{ .compatible = "allwinner,sun5i-a10s-display-engine" },
419 	{ .compatible = "allwinner,sun5i-a13-display-engine" },
420 	{ .compatible = "allwinner,sun6i-a31-display-engine" },
421 	{ .compatible = "allwinner,sun6i-a31s-display-engine" },
422 	{ .compatible = "allwinner,sun7i-a20-display-engine" },
423 	{ .compatible = "allwinner,sun8i-a23-display-engine" },
424 	{ .compatible = "allwinner,sun8i-a33-display-engine" },
425 	{ .compatible = "allwinner,sun8i-a83t-display-engine" },
426 	{ .compatible = "allwinner,sun8i-h3-display-engine" },
427 	{ .compatible = "allwinner,sun8i-r40-display-engine" },
428 	{ .compatible = "allwinner,sun8i-v3s-display-engine" },
429 	{ .compatible = "allwinner,sun9i-a80-display-engine" },
430 	{ .compatible = "allwinner,sun20i-d1-display-engine" },
431 	{ .compatible = "allwinner,sun50i-a64-display-engine" },
432 	{ .compatible = "allwinner,sun50i-h6-display-engine" },
433 	{ }
434 };
435 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
436 
437 static struct platform_driver sun4i_drv_platform_driver = {
438 	.probe		= sun4i_drv_probe,
439 	.remove_new	= sun4i_drv_remove,
440 	.driver		= {
441 		.name		= "sun4i-drm",
442 		.of_match_table	= sun4i_drv_of_table,
443 		.pm = &sun4i_drv_drm_pm_ops,
444 	},
445 };
446 drm_module_platform_driver(sun4i_drv_platform_driver);
447 
448 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
449 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
450 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
451 MODULE_LICENSE("GPL");
452