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/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
drm_sun4i_gem_dumb_create(struct drm_file * file_priv,struct drm_device * drm,struct drm_mode_create_dumb * args)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
sun4i_drv_bind(struct device * dev)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
sun4i_drv_unbind(struct device * dev)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
sun4i_drv_node_is_connector(struct device_node * node)155 static bool sun4i_drv_node_is_connector(struct device_node *node)
156 {
157 return of_device_is_compatible(node, "hdmi-connector");
158 }
159
sun4i_drv_node_is_frontend(struct device_node * node)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
sun4i_drv_node_is_deu(struct device_node * node)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
sun4i_drv_node_is_supported_frontend(struct device_node * node)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
sun4i_drv_node_is_tcon(struct device_node * node)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
sun4i_drv_node_is_tcon_with_ch0(struct device_node * node)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
sun4i_drv_node_is_tcon_top(struct device_node * node)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
sun4i_drv_traverse_endpoints(struct endpoint_list * list,struct device_node * node,int port_id)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
sun4i_drv_add_endpoints(struct device * dev,struct endpoint_list * list,struct component_match ** match,struct device_node * node)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
sun4i_drv_drm_sys_suspend(struct device * dev)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
sun4i_drv_drm_sys_resume(struct device * dev)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
sun4i_drv_probe(struct platform_device * pdev)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
sun4i_drv_remove(struct platform_device * pdev)413 static void sun4i_drv_remove(struct platform_device *pdev)
414 {
415 component_master_del(&pdev->dev, &sun4i_drv_master_ops);
416 }
417
sun4i_drv_shutdown(struct platform_device * pdev)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 <boris.brezillon@free-electrons.com>");
457 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
458 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
459 MODULE_LICENSE("GPL");
460