2 * Copyright (C) 2015 Free Electrons
3 * Copyright (C) 2015 NextThing Co
5 * Maxime Ripard <maxime.ripard@free-electrons.com>
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.
13 #include <linux/component.h>
14 #include <linux/kfifo.h>
15 #include <linux/of_graph.h>
16 #include <linux/of_reserved_mem.h>
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_fb_cma_helper.h>
21 #include <drm/drm_fb_helper.h>
22 #include <drm/drm_gem_cma_helper.h>
23 #include <drm/drm_of.h>
24 #include <drm/drm_probe_helper.h>
26 #include "sun4i_drv.h"
27 #include "sun4i_frontend.h"
28 #include "sun4i_framebuffer.h"
29 #include "sun4i_tcon.h"
30 #include "sun8i_tcon_top.h"
32 static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv,
33 struct drm_device *drm,
34 struct drm_mode_create_dumb *args)
36 /* The hardware only allows even pitches for YUV buffers. */
37 args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2);
39 return drm_gem_cma_dumb_create_internal(file_priv, drm, args);
42 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
44 static struct drm_driver sun4i_drv_driver = {
45 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
47 /* Generic Operations */
48 .fops = &sun4i_drv_fops,
50 .desc = "Allwinner sun4i Display Engine",
56 DRM_GEM_CMA_VMAP_DRIVER_OPS,
57 .dumb_create = drm_sun4i_gem_dumb_create,
60 static int sun4i_drv_bind(struct device *dev)
62 struct drm_device *drm;
63 struct sun4i_drv *drv;
66 drm = drm_dev_alloc(&sun4i_drv_driver, dev);
70 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
76 dev_set_drvdata(dev, drm);
77 drm->dev_private = drv;
78 INIT_LIST_HEAD(&drv->frontend_list);
79 INIT_LIST_HEAD(&drv->engine_list);
80 INIT_LIST_HEAD(&drv->tcon_list);
82 ret = of_reserved_mem_device_init(dev);
83 if (ret && ret != -ENODEV) {
84 dev_err(drm->dev, "Couldn't claim our memory region\n");
88 drm_mode_config_init(drm);
89 drm->mode_config.allow_fb_modifiers = true;
91 ret = component_bind_all(drm->dev, drm);
93 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
94 goto cleanup_mode_config;
97 /* drm_vblank_init calls kcalloc, which can fail */
98 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
100 goto cleanup_mode_config;
102 drm->irq_enabled = true;
104 /* Remove early framebuffers (ie. simplefb) */
105 drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
107 sun4i_framebuffer_init(drm);
109 /* Enable connectors polling */
110 drm_kms_helper_poll_init(drm);
112 ret = drm_dev_register(drm, 0);
116 drm_fbdev_generic_setup(drm, 32);
121 drm_kms_helper_poll_fini(drm);
123 drm_mode_config_cleanup(drm);
124 of_reserved_mem_device_release(dev);
130 static void sun4i_drv_unbind(struct device *dev)
132 struct drm_device *drm = dev_get_drvdata(dev);
134 drm_dev_unregister(drm);
135 drm_kms_helper_poll_fini(drm);
136 drm_atomic_helper_shutdown(drm);
137 drm_mode_config_cleanup(drm);
139 component_unbind_all(dev, NULL);
140 of_reserved_mem_device_release(dev);
145 static const struct component_master_ops sun4i_drv_master_ops = {
146 .bind = sun4i_drv_bind,
147 .unbind = sun4i_drv_unbind,
150 static bool sun4i_drv_node_is_connector(struct device_node *node)
152 return of_device_is_compatible(node, "hdmi-connector");
155 static bool sun4i_drv_node_is_frontend(struct device_node *node)
157 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
158 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
159 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
160 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
161 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||
162 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
163 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
166 static bool sun4i_drv_node_is_deu(struct device_node *node)
168 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
171 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
173 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
174 return !!of_match_node(sun4i_frontend_of_table, node);
179 static bool sun4i_drv_node_is_tcon(struct device_node *node)
181 return !!of_match_node(sun4i_tcon_of_table, node);
184 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
186 const struct of_device_id *match;
188 match = of_match_node(sun4i_tcon_of_table, node);
190 struct sun4i_tcon_quirks *quirks;
192 quirks = (struct sun4i_tcon_quirks *)match->data;
194 return quirks->has_channel_0;
200 static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
202 return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
203 !!of_match_node(sun8i_tcon_top_of_table, node);
206 static int compare_of(struct device *dev, void *data)
208 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
212 return dev->of_node == data;
216 * The encoder drivers use drm_of_find_possible_crtcs to get upstream
217 * crtcs from the device tree using of_graph. For the results to be
218 * correct, encoders must be probed/bound after _all_ crtcs have been
219 * created. The existing code uses a depth first recursive traversal
220 * of the of_graph, which means the encoders downstream of the TCON
221 * get add right after the first TCON. The second TCON or CRTC will
222 * never be properly associated with encoders connected to it.
224 * Also, in a dual display pipeline setup, both frontends can feed
225 * either backend, and both backends can feed either TCON, we want
226 * all components of the same type to be added before the next type
227 * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
228 * i.e. components of the same type are at the same depth when counted
229 * from the frontend. The only exception is the third pipeline in
230 * the A80 SoC, which we do not support anyway.
232 * Hence we can use a breadth first search traversal order to add
233 * components. We do not need to check for duplicates. The component
234 * matching system handles this for us.
236 struct endpoint_list {
237 DECLARE_KFIFO(fifo, struct device_node *, 16);
240 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
241 struct device_node *node,
244 struct device_node *ep, *remote, *port;
246 port = of_graph_get_port_by_id(node, port_id);
248 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
252 for_each_available_child_of_node(port, ep) {
253 remote = of_graph_get_remote_port_parent(ep);
255 DRM_DEBUG_DRIVER("Error retrieving the output node\n");
259 if (sun4i_drv_node_is_tcon(node)) {
261 * TCON TOP is always probed before TCON. However, TCON
262 * points back to TCON TOP when it is source for HDMI.
263 * We have to skip it here to prevent infinite looping
264 * between TCON TOP and TCON.
266 if (sun4i_drv_node_is_tcon_top(remote)) {
267 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
273 * If the node is our TCON with channel 0, the first
274 * port is used for panel or bridges, and will not be
275 * part of the component framework.
277 if (sun4i_drv_node_is_tcon_with_ch0(node)) {
278 struct of_endpoint endpoint;
280 if (of_graph_parse_endpoint(ep, &endpoint)) {
281 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
287 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
294 kfifo_put(&list->fifo, remote);
298 static int sun4i_drv_add_endpoints(struct device *dev,
299 struct endpoint_list *list,
300 struct component_match **match,
301 struct device_node *node)
306 * The frontend has been disabled in some of our old device
307 * trees. If we find a node that is the frontend and is
308 * disabled, we should just follow through and parse its
309 * child, but without adding it to the component list.
310 * Otherwise, we obviously want to add it to the list.
312 if (!sun4i_drv_node_is_frontend(node) &&
313 !of_device_is_available(node))
317 * The connectors will be the last nodes in our pipeline, we
320 if (sun4i_drv_node_is_connector(node))
324 * If the device is either just a regular device, or an
325 * enabled frontend supported by the driver, we add it to our
328 if (!(sun4i_drv_node_is_frontend(node) ||
329 sun4i_drv_node_is_deu(node)) ||
330 (sun4i_drv_node_is_supported_frontend(node) &&
331 of_device_is_available(node))) {
332 /* Add current component */
333 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
334 drm_of_component_match_add(dev, match, compare_of, node);
338 /* each node has at least one output */
339 sun4i_drv_traverse_endpoints(list, node, 1);
341 /* TCON TOP has second and third output */
342 if (sun4i_drv_node_is_tcon_top(node)) {
343 sun4i_drv_traverse_endpoints(list, node, 3);
344 sun4i_drv_traverse_endpoints(list, node, 5);
350 static int sun4i_drv_probe(struct platform_device *pdev)
352 struct component_match *match = NULL;
353 struct device_node *np = pdev->dev.of_node, *endpoint;
354 struct endpoint_list list;
355 int i, ret, count = 0;
357 INIT_KFIFO(list.fifo);
360 struct device_node *pipeline = of_parse_phandle(np,
361 "allwinner,pipelines",
366 kfifo_put(&list.fifo, pipeline);
369 while (kfifo_get(&list.fifo, &endpoint)) {
370 /* process this endpoint */
371 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
374 /* sun4i_drv_add_endpoints can fail to allocate memory */
382 return component_master_add_with_match(&pdev->dev,
383 &sun4i_drv_master_ops,
389 static int sun4i_drv_remove(struct platform_device *pdev)
391 component_master_del(&pdev->dev, &sun4i_drv_master_ops);
396 static const struct of_device_id sun4i_drv_of_table[] = {
397 { .compatible = "allwinner,sun4i-a10-display-engine" },
398 { .compatible = "allwinner,sun5i-a10s-display-engine" },
399 { .compatible = "allwinner,sun5i-a13-display-engine" },
400 { .compatible = "allwinner,sun6i-a31-display-engine" },
401 { .compatible = "allwinner,sun6i-a31s-display-engine" },
402 { .compatible = "allwinner,sun7i-a20-display-engine" },
403 { .compatible = "allwinner,sun8i-a23-display-engine" },
404 { .compatible = "allwinner,sun8i-a33-display-engine" },
405 { .compatible = "allwinner,sun8i-a83t-display-engine" },
406 { .compatible = "allwinner,sun8i-h3-display-engine" },
407 { .compatible = "allwinner,sun8i-r40-display-engine" },
408 { .compatible = "allwinner,sun8i-v3s-display-engine" },
409 { .compatible = "allwinner,sun9i-a80-display-engine" },
410 { .compatible = "allwinner,sun50i-a64-display-engine" },
411 { .compatible = "allwinner,sun50i-h6-display-engine" },
414 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
416 static struct platform_driver sun4i_drv_platform_driver = {
417 .probe = sun4i_drv_probe,
418 .remove = sun4i_drv_remove,
421 .of_match_table = sun4i_drv_of_table,
424 module_platform_driver(sun4i_drv_platform_driver);
426 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
427 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
428 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
429 MODULE_LICENSE("GPL");