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/of_graph.h>
15 #include <linux/of_reserved_mem.h>
18 #include <drm/drm_crtc_helper.h>
19 #include <drm/drm_fb_cma_helper.h>
20 #include <drm/drm_gem_cma_helper.h>
21 #include <drm/drm_fb_helper.h>
22 #include <drm/drm_of.h>
24 #include "sun4i_drv.h"
25 #include "sun4i_framebuffer.h"
26 #include "sun4i_tcon.h"
28 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
30 static struct drm_driver sun4i_drv_driver = {
31 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
33 /* Generic Operations */
34 .fops = &sun4i_drv_fops,
36 .desc = "Allwinner sun4i Display Engine",
42 .dumb_create = drm_gem_cma_dumb_create,
43 .dumb_destroy = drm_gem_dumb_destroy,
44 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
45 .gem_free_object_unlocked = drm_gem_cma_free_object,
46 .gem_vm_ops = &drm_gem_cma_vm_ops,
48 /* PRIME Operations */
49 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
50 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
51 .gem_prime_import = drm_gem_prime_import,
52 .gem_prime_export = drm_gem_prime_export,
53 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
54 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
55 .gem_prime_vmap = drm_gem_cma_prime_vmap,
56 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
57 .gem_prime_mmap = drm_gem_cma_prime_mmap,
59 /* Frame Buffer Operations */
62 static void sun4i_remove_framebuffers(void)
64 struct apertures_struct *ap;
66 ap = alloc_apertures(1);
70 /* The framebuffer can be located anywhere in RAM */
71 ap->ranges[0].base = 0;
72 ap->ranges[0].size = ~0;
74 drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
78 static int sun4i_drv_bind(struct device *dev)
80 struct drm_device *drm;
81 struct sun4i_drv *drv;
84 drm = drm_dev_alloc(&sun4i_drv_driver, dev);
88 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
93 drm->dev_private = drv;
95 ret = of_reserved_mem_device_init(dev);
96 if (ret && ret != -ENODEV) {
97 dev_err(drm->dev, "Couldn't claim our memory region\n");
101 /* drm_vblank_init calls kcalloc, which can fail */
102 ret = drm_vblank_init(drm, 1);
104 goto free_mem_region;
106 drm_mode_config_init(drm);
108 ret = component_bind_all(drm->dev, drm);
110 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
111 goto cleanup_mode_config;
114 drm->irq_enabled = true;
116 /* Remove early framebuffers (ie. simplefb) */
117 sun4i_remove_framebuffers();
119 /* Create our framebuffer */
120 drv->fbdev = sun4i_framebuffer_init(drm);
121 if (IS_ERR(drv->fbdev)) {
122 dev_err(drm->dev, "Couldn't create our framebuffer\n");
123 ret = PTR_ERR(drv->fbdev);
124 goto cleanup_mode_config;
127 /* Enable connectors polling */
128 drm_kms_helper_poll_init(drm);
130 ret = drm_dev_register(drm, 0);
137 drm_kms_helper_poll_fini(drm);
138 sun4i_framebuffer_free(drm);
140 drm_mode_config_cleanup(drm);
141 drm_vblank_cleanup(drm);
143 of_reserved_mem_device_release(dev);
149 static void sun4i_drv_unbind(struct device *dev)
151 struct drm_device *drm = dev_get_drvdata(dev);
153 drm_dev_unregister(drm);
154 drm_kms_helper_poll_fini(drm);
155 sun4i_framebuffer_free(drm);
156 drm_mode_config_cleanup(drm);
157 drm_vblank_cleanup(drm);
158 of_reserved_mem_device_release(dev);
162 static const struct component_master_ops sun4i_drv_master_ops = {
163 .bind = sun4i_drv_bind,
164 .unbind = sun4i_drv_unbind,
167 static bool sun4i_drv_node_is_frontend(struct device_node *node)
169 return of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
170 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
171 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
174 static bool sun4i_drv_node_is_tcon(struct device_node *node)
176 return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") ||
177 of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") ||
178 of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") ||
179 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon");
182 static int compare_of(struct device *dev, void *data)
184 DRM_DEBUG_DRIVER("Comparing of node %s with %s\n",
185 of_node_full_name(dev->of_node),
186 of_node_full_name(data));
188 return dev->of_node == data;
191 static int sun4i_drv_add_endpoints(struct device *dev,
192 struct component_match **match,
193 struct device_node *node)
195 struct device_node *port, *ep, *remote;
199 * We don't support the frontend for now, so we will never
200 * have a device bound. Just skip over it, but we still want
201 * the rest our pipeline to be added.
203 if (!sun4i_drv_node_is_frontend(node) &&
204 !of_device_is_available(node))
207 if (!sun4i_drv_node_is_frontend(node)) {
208 /* Add current component */
209 DRM_DEBUG_DRIVER("Adding component %s\n",
210 of_node_full_name(node));
211 drm_of_component_match_add(dev, match, compare_of, node);
215 /* Inputs are listed first, then outputs */
216 port = of_graph_get_port_by_id(node, 1);
218 DRM_DEBUG_DRIVER("No output to bind\n");
222 for_each_available_child_of_node(port, ep) {
223 remote = of_graph_get_remote_port_parent(ep);
225 DRM_DEBUG_DRIVER("Error retrieving the output node\n");
231 * If the node is our TCON, the first port is used for
232 * panel or bridges, and will not be part of the
233 * component framework.
235 if (sun4i_drv_node_is_tcon(node)) {
236 struct of_endpoint endpoint;
238 if (of_graph_parse_endpoint(ep, &endpoint)) {
239 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
244 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
249 /* Walk down our tree */
250 count += sun4i_drv_add_endpoints(dev, match, remote);
258 static int sun4i_drv_probe(struct platform_device *pdev)
260 struct component_match *match = NULL;
261 struct device_node *np = pdev->dev.of_node;
265 struct device_node *pipeline = of_parse_phandle(np,
266 "allwinner,pipelines",
271 count += sun4i_drv_add_endpoints(&pdev->dev, &match,
273 of_node_put(pipeline);
275 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n",
280 return component_master_add_with_match(&pdev->dev,
281 &sun4i_drv_master_ops,
287 static int sun4i_drv_remove(struct platform_device *pdev)
292 static const struct of_device_id sun4i_drv_of_table[] = {
293 { .compatible = "allwinner,sun5i-a13-display-engine" },
294 { .compatible = "allwinner,sun6i-a31-display-engine" },
295 { .compatible = "allwinner,sun6i-a31s-display-engine" },
296 { .compatible = "allwinner,sun8i-a33-display-engine" },
299 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
301 static struct platform_driver sun4i_drv_platform_driver = {
302 .probe = sun4i_drv_probe,
303 .remove = sun4i_drv_remove,
306 .of_match_table = sun4i_drv_of_table,
309 module_platform_driver(sun4i_drv_platform_driver);
311 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
312 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
313 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
314 MODULE_LICENSE("GPL");