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1/*
2 * Copyright (C) 2015 Free Electrons
3 * Copyright (C) 2015 NextThing Co
4 *
5 * Maxime Ripard <maxime.ripard@free-electrons.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 */
12
13#include <linux/component.h>
14#include <linux/kfifo.h>
15#include <linux/of_graph.h>
16#include <linux/of_reserved_mem.h>
17
18#include <drm/drmP.h>
19#include <drm/drm_crtc_helper.h>
20#include <drm/drm_fb_cma_helper.h>
21#include <drm/drm_gem_cma_helper.h>
22#include <drm/drm_fb_helper.h>
23#include <drm/drm_of.h>
24
25#include "sun4i_drv.h"
26#include "sun4i_frontend.h"
27#include "sun4i_framebuffer.h"
28#include "sun4i_tcon.h"
29
30DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
31
32static struct drm_driver sun4i_drv_driver = {
33 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
34
35 /* Generic Operations */
36 .lastclose = drm_fb_helper_lastclose,
37 .fops = &sun4i_drv_fops,
38 .name = "sun4i-drm",
39 .desc = "Allwinner sun4i Display Engine",
40 .date = "20150629",
41 .major = 1,
42 .minor = 0,
43
44 /* GEM Operations */
45 .dumb_create = drm_gem_cma_dumb_create,
46 .gem_free_object_unlocked = drm_gem_cma_free_object,
47 .gem_vm_ops = &drm_gem_cma_vm_ops,
48
49 /* PRIME Operations */
50 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
51 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
52 .gem_prime_import = drm_gem_prime_import,
53 .gem_prime_export = drm_gem_prime_export,
54 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
55 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
56 .gem_prime_vmap = drm_gem_cma_prime_vmap,
57 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
58 .gem_prime_mmap = drm_gem_cma_prime_mmap,
59
60 /* Frame Buffer Operations */
61};
62
63static void sun4i_remove_framebuffers(void)
64{
65 struct apertures_struct *ap;
66
67 ap = alloc_apertures(1);
68 if (!ap)
69 return;
70
71 /* The framebuffer can be located anywhere in RAM */
72 ap->ranges[0].base = 0;
73 ap->ranges[0].size = ~0;
74
75 drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
76 kfree(ap);
77}
78
79static int sun4i_drv_bind(struct device *dev)
80{
81 struct drm_device *drm;
82 struct sun4i_drv *drv;
83 int ret;
84
85 drm = drm_dev_alloc(&sun4i_drv_driver, dev);
86 if (IS_ERR(drm))
87 return PTR_ERR(drm);
88
89 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
90 if (!drv) {
91 ret = -ENOMEM;
92 goto free_drm;
93 }
94 drm->dev_private = drv;
95 INIT_LIST_HEAD(&drv->frontend_list);
96 INIT_LIST_HEAD(&drv->engine_list);
97 INIT_LIST_HEAD(&drv->tcon_list);
98
99 ret = of_reserved_mem_device_init(dev);
100 if (ret && ret != -ENODEV) {
101 dev_err(drm->dev, "Couldn't claim our memory region\n");
102 goto free_drm;
103 }
104
105 drm_mode_config_init(drm);
106
107 ret = component_bind_all(drm->dev, drm);
108 if (ret) {
109 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
110 goto cleanup_mode_config;
111 }
112
113 /* drm_vblank_init calls kcalloc, which can fail */
114 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
115 if (ret)
116 goto cleanup_mode_config;
117
118 drm->irq_enabled = true;
119
120 /* Remove early framebuffers (ie. simplefb) */
121 sun4i_remove_framebuffers();
122
123 /* Create our framebuffer */
124 ret = sun4i_framebuffer_init(drm);
125 if (ret) {
126 dev_err(drm->dev, "Couldn't create our framebuffer\n");
127 goto cleanup_mode_config;
128 }
129
130 /* Enable connectors polling */
131 drm_kms_helper_poll_init(drm);
132
133 ret = drm_dev_register(drm, 0);
134 if (ret)
135 goto finish_poll;
136
137 return 0;
138
139finish_poll:
140 drm_kms_helper_poll_fini(drm);
141 sun4i_framebuffer_free(drm);
142cleanup_mode_config:
143 drm_mode_config_cleanup(drm);
144 of_reserved_mem_device_release(dev);
145free_drm:
146 drm_dev_unref(drm);
147 return ret;
148}
149
150static void sun4i_drv_unbind(struct device *dev)
151{
152 struct drm_device *drm = dev_get_drvdata(dev);
153
154 drm_dev_unregister(drm);
155 drm_kms_helper_poll_fini(drm);
156 sun4i_framebuffer_free(drm);
157 drm_mode_config_cleanup(drm);
158 of_reserved_mem_device_release(dev);
159 drm_dev_unref(drm);
160}
161
162static const struct component_master_ops sun4i_drv_master_ops = {
163 .bind = sun4i_drv_bind,
164 .unbind = sun4i_drv_unbind,
165};
166
167static bool sun4i_drv_node_is_connector(struct device_node *node)
168{
169 return of_device_is_compatible(node, "hdmi-connector");
170}
171
172static bool sun4i_drv_node_is_frontend(struct device_node *node)
173{
174 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
175 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
176 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
177 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
178 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
179 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
180}
181
182static bool sun4i_drv_node_is_deu(struct device_node *node)
183{
184 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
185}
186
187static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
188{
189 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
190 return !!of_match_node(sun4i_frontend_of_table, node);
191
192 return false;
193}
194
195static bool sun4i_drv_node_is_tcon(struct device_node *node)
196{
197 return !!of_match_node(sun4i_tcon_of_table, node);
198}
199
200static int compare_of(struct device *dev, void *data)
201{
202 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
203 dev->of_node,
204 data);
205
206 return dev->of_node == data;
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 */
230struct endpoint_list {
231 DECLARE_KFIFO(fifo, struct device_node *, 16);
232};
233
234static int sun4i_drv_add_endpoints(struct device *dev,
235 struct endpoint_list *list,
236 struct component_match **match,
237 struct device_node *node)
238{
239 struct device_node *port, *ep, *remote;
240 int count = 0;
241
242 /*
243 * The frontend has been disabled in some of our old device
244 * trees. If we find a node that is the frontend and is
245 * disabled, we should just follow through and parse its
246 * child, but without adding it to the component list.
247 * Otherwise, we obviously want to add it to the list.
248 */
249 if (!sun4i_drv_node_is_frontend(node) &&
250 !of_device_is_available(node))
251 return 0;
252
253 /*
254 * The connectors will be the last nodes in our pipeline, we
255 * can just bail out.
256 */
257 if (sun4i_drv_node_is_connector(node))
258 return 0;
259
260 /*
261 * If the device is either just a regular device, or an
262 * enabled frontend supported by the driver, we add it to our
263 * component list.
264 */
265 if (!(sun4i_drv_node_is_frontend(node) ||
266 sun4i_drv_node_is_deu(node)) ||
267 (sun4i_drv_node_is_supported_frontend(node) &&
268 of_device_is_available(node))) {
269 /* Add current component */
270 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
271 drm_of_component_match_add(dev, match, compare_of, node);
272 count++;
273 }
274
275 /* Inputs are listed first, then outputs */
276 port = of_graph_get_port_by_id(node, 1);
277 if (!port) {
278 DRM_DEBUG_DRIVER("No output to bind\n");
279 return count;
280 }
281
282 for_each_available_child_of_node(port, ep) {
283 remote = of_graph_get_remote_port_parent(ep);
284 if (!remote) {
285 DRM_DEBUG_DRIVER("Error retrieving the output node\n");
286 of_node_put(remote);
287 continue;
288 }
289
290 /*
291 * If the node is our TCON, the first port is used for
292 * panel or bridges, and will not be part of the
293 * component framework.
294 */
295 if (sun4i_drv_node_is_tcon(node)) {
296 struct of_endpoint endpoint;
297
298 if (of_graph_parse_endpoint(ep, &endpoint)) {
299 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
300 continue;
301 }
302
303 if (!endpoint.id) {
304 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
305 continue;
306 }
307 }
308
309 kfifo_put(&list->fifo, remote);
310 }
311
312 return count;
313}
314
315static int sun4i_drv_probe(struct platform_device *pdev)
316{
317 struct component_match *match = NULL;
318 struct device_node *np = pdev->dev.of_node, *endpoint;
319 struct endpoint_list list;
320 int i, ret, count = 0;
321
322 INIT_KFIFO(list.fifo);
323
324 for (i = 0;; i++) {
325 struct device_node *pipeline = of_parse_phandle(np,
326 "allwinner,pipelines",
327 i);
328 if (!pipeline)
329 break;
330
331 kfifo_put(&list.fifo, pipeline);
332 }
333
334 while (kfifo_get(&list.fifo, &endpoint)) {
335 /* process this endpoint */
336 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
337 endpoint);
338
339 /* sun4i_drv_add_endpoints can fail to allocate memory */
340 if (ret < 0)
341 return ret;
342
343 count += ret;
344 }
345
346 if (count)
347 return component_master_add_with_match(&pdev->dev,
348 &sun4i_drv_master_ops,
349 match);
350 else
351 return 0;
352}
353
354static int sun4i_drv_remove(struct platform_device *pdev)
355{
356 return 0;
357}
358
359static const struct of_device_id sun4i_drv_of_table[] = {
360 { .compatible = "allwinner,sun4i-a10-display-engine" },
361 { .compatible = "allwinner,sun5i-a10s-display-engine" },
362 { .compatible = "allwinner,sun5i-a13-display-engine" },
363 { .compatible = "allwinner,sun6i-a31-display-engine" },
364 { .compatible = "allwinner,sun6i-a31s-display-engine" },
365 { .compatible = "allwinner,sun7i-a20-display-engine" },
366 { .compatible = "allwinner,sun8i-a33-display-engine" },
367 { .compatible = "allwinner,sun8i-a83t-display-engine" },
368 { .compatible = "allwinner,sun8i-h3-display-engine" },
369 { .compatible = "allwinner,sun8i-v3s-display-engine" },
370 { .compatible = "allwinner,sun9i-a80-display-engine" },
371 { }
372};
373MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
374
375static struct platform_driver sun4i_drv_platform_driver = {
376 .probe = sun4i_drv_probe,
377 .remove = sun4i_drv_remove,
378 .driver = {
379 .name = "sun4i-drm",
380 .of_match_table = sun4i_drv_of_table,
381 },
382};
383module_platform_driver(sun4i_drv_platform_driver);
384
385MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
386MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
387MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
388MODULE_LICENSE("GPL");