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 .lastclose = drm_fb_helper_lastclose, 38 .fops = &sun4i_drv_fops, 39 .name = "sun4i-drm", 40 .desc = "Allwinner sun4i Display Engine", 41 .date = "20150629", 42 .major = 1, 43 .minor = 0, 44 45 /* GEM Operations */ 46 .dumb_create = drm_gem_cma_dumb_create, 47 .gem_free_object_unlocked = drm_gem_cma_free_object, 48 .gem_vm_ops = &drm_gem_cma_vm_ops, 49 50 /* PRIME Operations */ 51 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 52 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 53 .gem_prime_import = drm_gem_prime_import, 54 .gem_prime_export = drm_gem_prime_export, 55 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 56 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 57 .gem_prime_vmap = drm_gem_cma_prime_vmap, 58 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 59 .gem_prime_mmap = drm_gem_cma_prime_mmap, 60 61 /* Frame Buffer Operations */ 62 }; 63 64 static int sun4i_drv_bind(struct device *dev) 65 { 66 struct drm_device *drm; 67 struct sun4i_drv *drv; 68 int ret; 69 70 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 71 if (IS_ERR(drm)) 72 return PTR_ERR(drm); 73 74 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 75 if (!drv) { 76 ret = -ENOMEM; 77 goto free_drm; 78 } 79 drm->dev_private = drv; 80 INIT_LIST_HEAD(&drv->frontend_list); 81 INIT_LIST_HEAD(&drv->engine_list); 82 INIT_LIST_HEAD(&drv->tcon_list); 83 84 ret = of_reserved_mem_device_init(dev); 85 if (ret && ret != -ENODEV) { 86 dev_err(drm->dev, "Couldn't claim our memory region\n"); 87 goto free_drm; 88 } 89 90 drm_mode_config_init(drm); 91 92 ret = component_bind_all(drm->dev, drm); 93 if (ret) { 94 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 95 goto cleanup_mode_config; 96 } 97 98 /* drm_vblank_init calls kcalloc, which can fail */ 99 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 100 if (ret) 101 goto cleanup_mode_config; 102 103 drm->irq_enabled = true; 104 105 /* Remove early framebuffers (ie. simplefb) */ 106 drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false); 107 108 /* Create our framebuffer */ 109 ret = sun4i_framebuffer_init(drm); 110 if (ret) { 111 dev_err(drm->dev, "Couldn't create our framebuffer\n"); 112 goto cleanup_mode_config; 113 } 114 115 /* Enable connectors polling */ 116 drm_kms_helper_poll_init(drm); 117 118 ret = drm_dev_register(drm, 0); 119 if (ret) 120 goto finish_poll; 121 122 return 0; 123 124 finish_poll: 125 drm_kms_helper_poll_fini(drm); 126 sun4i_framebuffer_free(drm); 127 cleanup_mode_config: 128 drm_mode_config_cleanup(drm); 129 of_reserved_mem_device_release(dev); 130 free_drm: 131 drm_dev_put(drm); 132 return ret; 133 } 134 135 static void sun4i_drv_unbind(struct device *dev) 136 { 137 struct drm_device *drm = dev_get_drvdata(dev); 138 139 drm_dev_unregister(drm); 140 drm_kms_helper_poll_fini(drm); 141 sun4i_framebuffer_free(drm); 142 drm_mode_config_cleanup(drm); 143 of_reserved_mem_device_release(dev); 144 drm_dev_put(drm); 145 } 146 147 static const struct component_master_ops sun4i_drv_master_ops = { 148 .bind = sun4i_drv_bind, 149 .unbind = sun4i_drv_unbind, 150 }; 151 152 static bool sun4i_drv_node_is_connector(struct device_node *node) 153 { 154 return of_device_is_compatible(node, "hdmi-connector"); 155 } 156 157 static bool sun4i_drv_node_is_frontend(struct device_node *node) 158 { 159 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 160 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 161 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 162 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 163 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") || 164 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend"); 165 } 166 167 static bool sun4i_drv_node_is_deu(struct device_node *node) 168 { 169 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu"); 170 } 171 172 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node) 173 { 174 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND)) 175 return !!of_match_node(sun4i_frontend_of_table, node); 176 177 return false; 178 } 179 180 static bool sun4i_drv_node_is_tcon(struct device_node *node) 181 { 182 return !!of_match_node(sun4i_tcon_of_table, node); 183 } 184 185 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node) 186 { 187 const struct of_device_id *match; 188 189 match = of_match_node(sun4i_tcon_of_table, node); 190 if (match) { 191 struct sun4i_tcon_quirks *quirks; 192 193 quirks = (struct sun4i_tcon_quirks *)match->data; 194 195 return quirks->has_channel_0; 196 } 197 198 return false; 199 } 200 201 static bool sun4i_drv_node_is_tcon_top(struct device_node *node) 202 { 203 return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && 204 !!of_match_node(sun8i_tcon_top_of_table, node); 205 } 206 207 static int compare_of(struct device *dev, void *data) 208 { 209 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", 210 dev->of_node, 211 data); 212 213 return dev->of_node == data; 214 } 215 216 /* 217 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 218 * crtcs from the device tree using of_graph. For the results to be 219 * correct, encoders must be probed/bound after _all_ crtcs have been 220 * created. The existing code uses a depth first recursive traversal 221 * of the of_graph, which means the encoders downstream of the TCON 222 * get add right after the first TCON. The second TCON or CRTC will 223 * never be properly associated with encoders connected to it. 224 * 225 * Also, in a dual display pipeline setup, both frontends can feed 226 * either backend, and both backends can feed either TCON, we want 227 * all components of the same type to be added before the next type 228 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 229 * i.e. components of the same type are at the same depth when counted 230 * from the frontend. The only exception is the third pipeline in 231 * the A80 SoC, which we do not support anyway. 232 * 233 * Hence we can use a breadth first search traversal order to add 234 * components. We do not need to check for duplicates. The component 235 * matching system handles this for us. 236 */ 237 struct endpoint_list { 238 DECLARE_KFIFO(fifo, struct device_node *, 16); 239 }; 240 241 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, 242 struct device_node *node, 243 int port_id) 244 { 245 struct device_node *ep, *remote, *port; 246 247 port = of_graph_get_port_by_id(node, port_id); 248 if (!port) { 249 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); 250 return; 251 } 252 253 for_each_available_child_of_node(port, ep) { 254 remote = of_graph_get_remote_port_parent(ep); 255 if (!remote) { 256 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 257 continue; 258 } 259 260 if (sun4i_drv_node_is_tcon(node)) { 261 /* 262 * TCON TOP is always probed before TCON. However, TCON 263 * points back to TCON TOP when it is source for HDMI. 264 * We have to skip it here to prevent infinite looping 265 * between TCON TOP and TCON. 266 */ 267 if (sun4i_drv_node_is_tcon_top(remote)) { 268 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); 269 of_node_put(remote); 270 continue; 271 } 272 273 /* 274 * If the node is our TCON with channel 0, the first 275 * port is used for panel or bridges, and will not be 276 * part of the component framework. 277 */ 278 if (sun4i_drv_node_is_tcon_with_ch0(node)) { 279 struct of_endpoint endpoint; 280 281 if (of_graph_parse_endpoint(ep, &endpoint)) { 282 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 283 of_node_put(remote); 284 continue; 285 } 286 287 if (!endpoint.id) { 288 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 289 of_node_put(remote); 290 continue; 291 } 292 } 293 } 294 295 kfifo_put(&list->fifo, remote); 296 } 297 } 298 299 static int sun4i_drv_add_endpoints(struct device *dev, 300 struct endpoint_list *list, 301 struct component_match **match, 302 struct device_node *node) 303 { 304 int count = 0; 305 306 /* 307 * The frontend has been disabled in some of our old device 308 * trees. If we find a node that is the frontend and is 309 * disabled, we should just follow through and parse its 310 * child, but without adding it to the component list. 311 * Otherwise, we obviously want to add it to the list. 312 */ 313 if (!sun4i_drv_node_is_frontend(node) && 314 !of_device_is_available(node)) 315 return 0; 316 317 /* 318 * The connectors will be the last nodes in our pipeline, we 319 * can just bail out. 320 */ 321 if (sun4i_drv_node_is_connector(node)) 322 return 0; 323 324 /* 325 * If the device is either just a regular device, or an 326 * enabled frontend supported by the driver, we add it to our 327 * component list. 328 */ 329 if (!(sun4i_drv_node_is_frontend(node) || 330 sun4i_drv_node_is_deu(node)) || 331 (sun4i_drv_node_is_supported_frontend(node) && 332 of_device_is_available(node))) { 333 /* Add current component */ 334 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 335 drm_of_component_match_add(dev, match, compare_of, node); 336 count++; 337 } 338 339 /* each node has at least one output */ 340 sun4i_drv_traverse_endpoints(list, node, 1); 341 342 /* TCON TOP has second and third output */ 343 if (sun4i_drv_node_is_tcon_top(node)) { 344 sun4i_drv_traverse_endpoints(list, node, 3); 345 sun4i_drv_traverse_endpoints(list, node, 5); 346 } 347 348 return count; 349 } 350 351 static int sun4i_drv_probe(struct platform_device *pdev) 352 { 353 struct component_match *match = NULL; 354 struct device_node *np = pdev->dev.of_node, *endpoint; 355 struct endpoint_list list; 356 int i, ret, count = 0; 357 358 INIT_KFIFO(list.fifo); 359 360 for (i = 0;; i++) { 361 struct device_node *pipeline = of_parse_phandle(np, 362 "allwinner,pipelines", 363 i); 364 if (!pipeline) 365 break; 366 367 kfifo_put(&list.fifo, pipeline); 368 } 369 370 while (kfifo_get(&list.fifo, &endpoint)) { 371 /* process this endpoint */ 372 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 373 endpoint); 374 375 /* sun4i_drv_add_endpoints can fail to allocate memory */ 376 if (ret < 0) 377 return ret; 378 379 count += ret; 380 } 381 382 if (count) 383 return component_master_add_with_match(&pdev->dev, 384 &sun4i_drv_master_ops, 385 match); 386 else 387 return 0; 388 } 389 390 static int sun4i_drv_remove(struct platform_device *pdev) 391 { 392 return 0; 393 } 394 395 static const struct of_device_id sun4i_drv_of_table[] = { 396 { .compatible = "allwinner,sun4i-a10-display-engine" }, 397 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 398 { .compatible = "allwinner,sun5i-a13-display-engine" }, 399 { .compatible = "allwinner,sun6i-a31-display-engine" }, 400 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 401 { .compatible = "allwinner,sun7i-a20-display-engine" }, 402 { .compatible = "allwinner,sun8i-a33-display-engine" }, 403 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 404 { .compatible = "allwinner,sun8i-h3-display-engine" }, 405 { .compatible = "allwinner,sun8i-r40-display-engine" }, 406 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 407 { .compatible = "allwinner,sun9i-a80-display-engine" }, 408 { .compatible = "allwinner,sun50i-a64-display-engine" }, 409 { } 410 }; 411 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 412 413 static struct platform_driver sun4i_drv_platform_driver = { 414 .probe = sun4i_drv_probe, 415 .remove = sun4i_drv_remove, 416 .driver = { 417 .name = "sun4i-drm", 418 .of_match_table = sun4i_drv_of_table, 419 }, 420 }; 421 module_platform_driver(sun4i_drv_platform_driver); 422 423 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 424 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 425 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 426 MODULE_LICENSE("GPL"); 427