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[J-linux.git] / drivers / gpu / drm / sun4i / sun4i_drv.c
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 <[email protected]>
7  */
8
9 #include <linux/aperture.h>
10 #include <linux/component.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/kfifo.h>
13 #include <linux/module.h>
14 #include <linux/of_graph.h>
15 #include <linux/of_reserved_mem.h>
16 #include <linux/platform_device.h>
17
18 #include <drm/drm_atomic_helper.h>
19 #include <drm/drm_client_setup.h>
20 #include <drm/drm_drv.h>
21 #include <drm/drm_fbdev_dma.h>
22 #include <drm/drm_gem_dma_helper.h>
23 #include <drm/drm_module.h>
24 #include <drm/drm_of.h>
25 #include <drm/drm_probe_helper.h>
26 #include <drm/drm_vblank.h>
27
28 #include "sun4i_drv.h"
29 #include "sun4i_frontend.h"
30 #include "sun4i_framebuffer.h"
31 #include "sun4i_tcon.h"
32 #include "sun8i_tcon_top.h"
33
34 static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv,
35                                      struct drm_device *drm,
36                                      struct drm_mode_create_dumb *args)
37 {
38         /* The hardware only allows even pitches for YUV buffers. */
39         args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2);
40
41         return drm_gem_dma_dumb_create_internal(file_priv, drm, args);
42 }
43
44 DEFINE_DRM_GEM_DMA_FOPS(sun4i_drv_fops);
45
46 static const struct drm_driver sun4i_drv_driver = {
47         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
48
49         /* Generic Operations */
50         .fops                   = &sun4i_drv_fops,
51         .name                   = "sun4i-drm",
52         .desc                   = "Allwinner sun4i Display Engine",
53         .date                   = "20150629",
54         .major                  = 1,
55         .minor                  = 0,
56
57         /* GEM Operations */
58         DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_sun4i_gem_dumb_create),
59         DRM_FBDEV_DMA_DRIVER_OPS,
60 };
61
62 static int sun4i_drv_bind(struct device *dev)
63 {
64         struct drm_device *drm;
65         struct sun4i_drv *drv;
66         int ret;
67
68         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
69         if (IS_ERR(drm))
70                 return PTR_ERR(drm);
71
72         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
73         if (!drv) {
74                 ret = -ENOMEM;
75                 goto free_drm;
76         }
77
78         drm->dev_private = drv;
79         INIT_LIST_HEAD(&drv->frontend_list);
80         INIT_LIST_HEAD(&drv->engine_list);
81         INIT_LIST_HEAD(&drv->tcon_list);
82
83         ret = of_reserved_mem_device_init(dev);
84         if (ret && ret != -ENODEV) {
85                 dev_err(drm->dev, "Couldn't claim our memory region\n");
86                 goto free_drm;
87         }
88
89         drm_mode_config_init(drm);
90
91         ret = component_bind_all(drm->dev, drm);
92         if (ret) {
93                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
94                 goto cleanup_mode_config;
95         }
96
97         /* drm_vblank_init calls kcalloc, which can fail */
98         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
99         if (ret)
100                 goto unbind_all;
101
102         /* Remove early framebuffers (ie. simplefb) */
103         ret = aperture_remove_all_conflicting_devices(sun4i_drv_driver.name);
104         if (ret)
105                 goto unbind_all;
106
107         sun4i_framebuffer_init(drm);
108
109         /* Enable connectors polling */
110         drm_kms_helper_poll_init(drm);
111
112         ret = drm_dev_register(drm, 0);
113         if (ret)
114                 goto finish_poll;
115
116         drm_client_setup(drm, NULL);
117
118         dev_set_drvdata(dev, drm);
119
120         return 0;
121
122 finish_poll:
123         drm_kms_helper_poll_fini(drm);
124 unbind_all:
125         component_unbind_all(dev, NULL);
126 cleanup_mode_config:
127         drm_mode_config_cleanup(drm);
128         of_reserved_mem_device_release(dev);
129 free_drm:
130         drm_dev_put(drm);
131         return ret;
132 }
133
134 static void sun4i_drv_unbind(struct device *dev)
135 {
136         struct drm_device *drm = dev_get_drvdata(dev);
137
138         dev_set_drvdata(dev, NULL);
139         drm_dev_unregister(drm);
140         drm_kms_helper_poll_fini(drm);
141         drm_atomic_helper_shutdown(drm);
142         drm_mode_config_cleanup(drm);
143
144         component_unbind_all(dev, NULL);
145         of_reserved_mem_device_release(dev);
146
147         drm_dev_put(drm);
148 }
149
150 static const struct component_master_ops sun4i_drv_master_ops = {
151         .bind   = sun4i_drv_bind,
152         .unbind = sun4i_drv_unbind,
153 };
154
155 static bool sun4i_drv_node_is_connector(struct device_node *node)
156 {
157         return of_device_is_compatible(node, "hdmi-connector");
158 }
159
160 static bool sun4i_drv_node_is_frontend(struct device_node *node)
161 {
162         return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
163                 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
164                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
165                 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
166                 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||
167                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
168                 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
169 }
170
171 static bool sun4i_drv_node_is_deu(struct device_node *node)
172 {
173         return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
174 }
175
176 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
177 {
178         if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
179                 return !!of_match_node(sun4i_frontend_of_table, node);
180
181         return false;
182 }
183
184 static bool sun4i_drv_node_is_tcon(struct device_node *node)
185 {
186         return !!of_match_node(sun4i_tcon_of_table, node);
187 }
188
189 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
190 {
191         const struct of_device_id *match;
192
193         match = of_match_node(sun4i_tcon_of_table, node);
194         if (match) {
195                 struct sun4i_tcon_quirks *quirks;
196
197                 quirks = (struct sun4i_tcon_quirks *)match->data;
198
199                 return quirks->has_channel_0;
200         }
201
202         return false;
203 }
204
205 static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
206 {
207         return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
208                 !!of_match_node(sun8i_tcon_top_of_table, node);
209 }
210
211 /*
212  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
213  * crtcs from the device tree using of_graph. For the results to be
214  * correct, encoders must be probed/bound after _all_ crtcs have been
215  * created. The existing code uses a depth first recursive traversal
216  * of the of_graph, which means the encoders downstream of the TCON
217  * get add right after the first TCON. The second TCON or CRTC will
218  * never be properly associated with encoders connected to it.
219  *
220  * Also, in a dual display pipeline setup, both frontends can feed
221  * either backend, and both backends can feed either TCON, we want
222  * all components of the same type to be added before the next type
223  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
224  * i.e. components of the same type are at the same depth when counted
225  * from the frontend. The only exception is the third pipeline in
226  * the A80 SoC, which we do not support anyway.
227  *
228  * Hence we can use a breadth first search traversal order to add
229  * components. We do not need to check for duplicates. The component
230  * matching system handles this for us.
231  */
232 struct endpoint_list {
233         DECLARE_KFIFO(fifo, struct device_node *, 16);
234 };
235
236 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
237                                          struct device_node *node,
238                                          int port_id)
239 {
240         struct device_node *ep, *remote, *port;
241
242         port = of_graph_get_port_by_id(node, port_id);
243         if (!port) {
244                 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
245                 return;
246         }
247
248         for_each_available_child_of_node(port, ep) {
249                 remote = of_graph_get_remote_port_parent(ep);
250                 if (!remote) {
251                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
252                         continue;
253                 }
254
255                 if (sun4i_drv_node_is_tcon(node)) {
256                         /*
257                          * TCON TOP is always probed before TCON. However, TCON
258                          * points back to TCON TOP when it is source for HDMI.
259                          * We have to skip it here to prevent infinite looping
260                          * between TCON TOP and TCON.
261                          */
262                         if (sun4i_drv_node_is_tcon_top(remote)) {
263                                 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
264                                 of_node_put(remote);
265                                 continue;
266                         }
267
268                         /*
269                          * If the node is our TCON with channel 0, the first
270                          * port is used for panel or bridges, and will not be
271                          * part of the component framework.
272                          */
273                         if (sun4i_drv_node_is_tcon_with_ch0(node)) {
274                                 struct of_endpoint endpoint;
275
276                                 if (of_graph_parse_endpoint(ep, &endpoint)) {
277                                         DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
278                                         of_node_put(remote);
279                                         continue;
280                                 }
281
282                                 if (!endpoint.id) {
283                                         DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
284                                         of_node_put(remote);
285                                         continue;
286                                 }
287                         }
288                 }
289
290                 kfifo_put(&list->fifo, remote);
291         }
292 }
293
294 static int sun4i_drv_add_endpoints(struct device *dev,
295                                    struct endpoint_list *list,
296                                    struct component_match **match,
297                                    struct device_node *node)
298 {
299         int count = 0;
300
301         /*
302          * The frontend has been disabled in some of our old device
303          * trees. If we find a node that is the frontend and is
304          * disabled, we should just follow through and parse its
305          * child, but without adding it to the component list.
306          * Otherwise, we obviously want to add it to the list.
307          */
308         if (!sun4i_drv_node_is_frontend(node) &&
309             !of_device_is_available(node))
310                 return 0;
311
312         /*
313          * The connectors will be the last nodes in our pipeline, we
314          * can just bail out.
315          */
316         if (sun4i_drv_node_is_connector(node))
317                 return 0;
318
319         /*
320          * If the device is either just a regular device, or an
321          * enabled frontend supported by the driver, we add it to our
322          * component list.
323          */
324         if (!(sun4i_drv_node_is_frontend(node) ||
325               sun4i_drv_node_is_deu(node)) ||
326             (sun4i_drv_node_is_supported_frontend(node) &&
327              of_device_is_available(node))) {
328                 /* Add current component */
329                 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
330                 drm_of_component_match_add(dev, match, component_compare_of, node);
331                 count++;
332         }
333
334         /* each node has at least one output */
335         sun4i_drv_traverse_endpoints(list, node, 1);
336
337         /* TCON TOP has second and third output */
338         if (sun4i_drv_node_is_tcon_top(node)) {
339                 sun4i_drv_traverse_endpoints(list, node, 3);
340                 sun4i_drv_traverse_endpoints(list, node, 5);
341         }
342
343         return count;
344 }
345
346 #ifdef CONFIG_PM_SLEEP
347 static int sun4i_drv_drm_sys_suspend(struct device *dev)
348 {
349         struct drm_device *drm = dev_get_drvdata(dev);
350
351         return drm_mode_config_helper_suspend(drm);
352 }
353
354 static int sun4i_drv_drm_sys_resume(struct device *dev)
355 {
356         struct drm_device *drm = dev_get_drvdata(dev);
357
358         return drm_mode_config_helper_resume(drm);
359 }
360 #endif
361
362 static const struct dev_pm_ops sun4i_drv_drm_pm_ops = {
363         SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend,
364                                 sun4i_drv_drm_sys_resume)
365 };
366
367 static int sun4i_drv_probe(struct platform_device *pdev)
368 {
369         struct component_match *match = NULL;
370         struct device_node *np = pdev->dev.of_node, *endpoint;
371         struct endpoint_list list;
372         int i, ret, count = 0;
373
374         INIT_KFIFO(list.fifo);
375
376         /*
377          * DE2 and DE3 cores actually supports 40-bit addresses, but
378          * driver does not.
379          */
380         dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
381         dma_set_max_seg_size(&pdev->dev, UINT_MAX);
382
383         for (i = 0;; i++) {
384                 struct device_node *pipeline = of_parse_phandle(np,
385                                                                 "allwinner,pipelines",
386                                                                 i);
387                 if (!pipeline)
388                         break;
389
390                 kfifo_put(&list.fifo, pipeline);
391         }
392
393         while (kfifo_get(&list.fifo, &endpoint)) {
394                 /* process this endpoint */
395                 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
396                                               endpoint);
397
398                 /* sun4i_drv_add_endpoints can fail to allocate memory */
399                 if (ret < 0)
400                         return ret;
401
402                 count += ret;
403         }
404
405         if (count)
406                 return component_master_add_with_match(&pdev->dev,
407                                                        &sun4i_drv_master_ops,
408                                                        match);
409         else
410                 return 0;
411 }
412
413 static void sun4i_drv_remove(struct platform_device *pdev)
414 {
415         component_master_del(&pdev->dev, &sun4i_drv_master_ops);
416 }
417
418 static void sun4i_drv_shutdown(struct platform_device *pdev)
419 {
420         drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
421 }
422
423 static const struct of_device_id sun4i_drv_of_table[] = {
424         { .compatible = "allwinner,sun4i-a10-display-engine" },
425         { .compatible = "allwinner,sun5i-a10s-display-engine" },
426         { .compatible = "allwinner,sun5i-a13-display-engine" },
427         { .compatible = "allwinner,sun6i-a31-display-engine" },
428         { .compatible = "allwinner,sun6i-a31s-display-engine" },
429         { .compatible = "allwinner,sun7i-a20-display-engine" },
430         { .compatible = "allwinner,sun8i-a23-display-engine" },
431         { .compatible = "allwinner,sun8i-a33-display-engine" },
432         { .compatible = "allwinner,sun8i-a83t-display-engine" },
433         { .compatible = "allwinner,sun8i-h3-display-engine" },
434         { .compatible = "allwinner,sun8i-r40-display-engine" },
435         { .compatible = "allwinner,sun8i-v3s-display-engine" },
436         { .compatible = "allwinner,sun9i-a80-display-engine" },
437         { .compatible = "allwinner,sun20i-d1-display-engine" },
438         { .compatible = "allwinner,sun50i-a64-display-engine" },
439         { .compatible = "allwinner,sun50i-h6-display-engine" },
440         { }
441 };
442 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
443
444 static struct platform_driver sun4i_drv_platform_driver = {
445         .probe          = sun4i_drv_probe,
446         .remove         = sun4i_drv_remove,
447         .shutdown       = sun4i_drv_shutdown,
448         .driver         = {
449                 .name           = "sun4i-drm",
450                 .of_match_table = sun4i_drv_of_table,
451                 .pm = &sun4i_drv_drm_pm_ops,
452         },
453 };
454 drm_module_platform_driver(sun4i_drv_platform_driver);
455
456 MODULE_AUTHOR("Boris Brezillon <[email protected]>");
457 MODULE_AUTHOR("Maxime Ripard <[email protected]>");
458 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
459 MODULE_LICENSE("GPL");
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