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 #include "sun8i_tcon_top.h" 30 31 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops); 32 33 static struct drm_driver sun4i_drv_driver = { 34 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC, 35 36 /* Generic Operations */ 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 63 static int sun4i_drv_bind(struct device *dev) 64 { 65 struct drm_device *drm; 66 struct sun4i_drv *drv; 67 int ret; 68 69 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 70 if (IS_ERR(drm)) 71 return PTR_ERR(drm); 72 73 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 74 if (!drv) { 75 ret = -ENOMEM; 76 goto free_drm; 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 cleanup_mode_config; 101 102 drm->irq_enabled = true; 103 104 /* Remove early framebuffers (ie. simplefb) */ 105 drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false); 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_fbdev_generic_setup(drm, 32); 117 118 return 0; 119 120 finish_poll: 121 drm_kms_helper_poll_fini(drm); 122 cleanup_mode_config: 123 drm_mode_config_cleanup(drm); 124 of_reserved_mem_device_release(dev); 125 free_drm: 126 drm_dev_put(drm); 127 return ret; 128 } 129 130 static void sun4i_drv_unbind(struct device *dev) 131 { 132 struct drm_device *drm = dev_get_drvdata(dev); 133 134 drm_dev_unregister(drm); 135 drm_kms_helper_poll_fini(drm); 136 drm_mode_config_cleanup(drm); 137 of_reserved_mem_device_release(dev); 138 drm_dev_put(drm); 139 } 140 141 static const struct component_master_ops sun4i_drv_master_ops = { 142 .bind = sun4i_drv_bind, 143 .unbind = sun4i_drv_unbind, 144 }; 145 146 static bool sun4i_drv_node_is_connector(struct device_node *node) 147 { 148 return of_device_is_compatible(node, "hdmi-connector"); 149 } 150 151 static bool sun4i_drv_node_is_frontend(struct device_node *node) 152 { 153 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 154 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 155 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 156 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 157 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") || 158 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend"); 159 } 160 161 static bool sun4i_drv_node_is_deu(struct device_node *node) 162 { 163 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu"); 164 } 165 166 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node) 167 { 168 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND)) 169 return !!of_match_node(sun4i_frontend_of_table, node); 170 171 return false; 172 } 173 174 static bool sun4i_drv_node_is_tcon(struct device_node *node) 175 { 176 return !!of_match_node(sun4i_tcon_of_table, node); 177 } 178 179 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node) 180 { 181 const struct of_device_id *match; 182 183 match = of_match_node(sun4i_tcon_of_table, node); 184 if (match) { 185 struct sun4i_tcon_quirks *quirks; 186 187 quirks = (struct sun4i_tcon_quirks *)match->data; 188 189 return quirks->has_channel_0; 190 } 191 192 return false; 193 } 194 195 static bool sun4i_drv_node_is_tcon_top(struct device_node *node) 196 { 197 return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && 198 !!of_match_node(sun8i_tcon_top_of_table, node); 199 } 200 201 static int compare_of(struct device *dev, void *data) 202 { 203 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", 204 dev->of_node, 205 data); 206 207 return dev->of_node == data; 208 } 209 210 /* 211 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 212 * crtcs from the device tree using of_graph. For the results to be 213 * correct, encoders must be probed/bound after _all_ crtcs have been 214 * created. The existing code uses a depth first recursive traversal 215 * of the of_graph, which means the encoders downstream of the TCON 216 * get add right after the first TCON. The second TCON or CRTC will 217 * never be properly associated with encoders connected to it. 218 * 219 * Also, in a dual display pipeline setup, both frontends can feed 220 * either backend, and both backends can feed either TCON, we want 221 * all components of the same type to be added before the next type 222 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 223 * i.e. components of the same type are at the same depth when counted 224 * from the frontend. The only exception is the third pipeline in 225 * the A80 SoC, which we do not support anyway. 226 * 227 * Hence we can use a breadth first search traversal order to add 228 * components. We do not need to check for duplicates. The component 229 * matching system handles this for us. 230 */ 231 struct endpoint_list { 232 DECLARE_KFIFO(fifo, struct device_node *, 16); 233 }; 234 235 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, 236 struct device_node *node, 237 int port_id) 238 { 239 struct device_node *ep, *remote, *port; 240 241 port = of_graph_get_port_by_id(node, port_id); 242 if (!port) { 243 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); 244 return; 245 } 246 247 for_each_available_child_of_node(port, ep) { 248 remote = of_graph_get_remote_port_parent(ep); 249 if (!remote) { 250 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 251 continue; 252 } 253 254 if (sun4i_drv_node_is_tcon(node)) { 255 /* 256 * TCON TOP is always probed before TCON. However, TCON 257 * points back to TCON TOP when it is source for HDMI. 258 * We have to skip it here to prevent infinite looping 259 * between TCON TOP and TCON. 260 */ 261 if (sun4i_drv_node_is_tcon_top(remote)) { 262 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); 263 of_node_put(remote); 264 continue; 265 } 266 267 /* 268 * If the node is our TCON with channel 0, the first 269 * port is used for panel or bridges, and will not be 270 * part of the component framework. 271 */ 272 if (sun4i_drv_node_is_tcon_with_ch0(node)) { 273 struct of_endpoint endpoint; 274 275 if (of_graph_parse_endpoint(ep, &endpoint)) { 276 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 277 of_node_put(remote); 278 continue; 279 } 280 281 if (!endpoint.id) { 282 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 283 of_node_put(remote); 284 continue; 285 } 286 } 287 } 288 289 kfifo_put(&list->fifo, remote); 290 } 291 } 292 293 static int sun4i_drv_add_endpoints(struct device *dev, 294 struct endpoint_list *list, 295 struct component_match **match, 296 struct device_node *node) 297 { 298 int count = 0; 299 300 /* 301 * The frontend has been disabled in some of our old device 302 * trees. If we find a node that is the frontend and is 303 * disabled, we should just follow through and parse its 304 * child, but without adding it to the component list. 305 * Otherwise, we obviously want to add it to the list. 306 */ 307 if (!sun4i_drv_node_is_frontend(node) && 308 !of_device_is_available(node)) 309 return 0; 310 311 /* 312 * The connectors will be the last nodes in our pipeline, we 313 * can just bail out. 314 */ 315 if (sun4i_drv_node_is_connector(node)) 316 return 0; 317 318 /* 319 * If the device is either just a regular device, or an 320 * enabled frontend supported by the driver, we add it to our 321 * component list. 322 */ 323 if (!(sun4i_drv_node_is_frontend(node) || 324 sun4i_drv_node_is_deu(node)) || 325 (sun4i_drv_node_is_supported_frontend(node) && 326 of_device_is_available(node))) { 327 /* Add current component */ 328 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 329 drm_of_component_match_add(dev, match, compare_of, node); 330 count++; 331 } 332 333 /* each node has at least one output */ 334 sun4i_drv_traverse_endpoints(list, node, 1); 335 336 /* TCON TOP has second and third output */ 337 if (sun4i_drv_node_is_tcon_top(node)) { 338 sun4i_drv_traverse_endpoints(list, node, 3); 339 sun4i_drv_traverse_endpoints(list, node, 5); 340 } 341 342 return count; 343 } 344 345 static int sun4i_drv_probe(struct platform_device *pdev) 346 { 347 struct component_match *match = NULL; 348 struct device_node *np = pdev->dev.of_node, *endpoint; 349 struct endpoint_list list; 350 int i, ret, count = 0; 351 352 INIT_KFIFO(list.fifo); 353 354 for (i = 0;; i++) { 355 struct device_node *pipeline = of_parse_phandle(np, 356 "allwinner,pipelines", 357 i); 358 if (!pipeline) 359 break; 360 361 kfifo_put(&list.fifo, pipeline); 362 } 363 364 while (kfifo_get(&list.fifo, &endpoint)) { 365 /* process this endpoint */ 366 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 367 endpoint); 368 369 /* sun4i_drv_add_endpoints can fail to allocate memory */ 370 if (ret < 0) 371 return ret; 372 373 count += ret; 374 } 375 376 if (count) 377 return component_master_add_with_match(&pdev->dev, 378 &sun4i_drv_master_ops, 379 match); 380 else 381 return 0; 382 } 383 384 static int sun4i_drv_remove(struct platform_device *pdev) 385 { 386 return 0; 387 } 388 389 static const struct of_device_id sun4i_drv_of_table[] = { 390 { .compatible = "allwinner,sun4i-a10-display-engine" }, 391 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 392 { .compatible = "allwinner,sun5i-a13-display-engine" }, 393 { .compatible = "allwinner,sun6i-a31-display-engine" }, 394 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 395 { .compatible = "allwinner,sun7i-a20-display-engine" }, 396 { .compatible = "allwinner,sun8i-a33-display-engine" }, 397 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 398 { .compatible = "allwinner,sun8i-h3-display-engine" }, 399 { .compatible = "allwinner,sun8i-r40-display-engine" }, 400 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 401 { .compatible = "allwinner,sun9i-a80-display-engine" }, 402 { .compatible = "allwinner,sun50i-a64-display-engine" }, 403 { } 404 }; 405 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 406 407 static struct platform_driver sun4i_drv_platform_driver = { 408 .probe = sun4i_drv_probe, 409 .remove = sun4i_drv_remove, 410 .driver = { 411 .name = "sun4i-drm", 412 .of_match_table = sun4i_drv_of_table, 413 }, 414 }; 415 module_platform_driver(sun4i_drv_platform_driver); 416 417 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 418 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 419 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 420 MODULE_LICENSE("GPL"); 421