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_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> 25 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" 31 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) 35 { 36 /* The hardware only allows even pitches for YUV buffers. */ 37 args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2); 38 39 return drm_gem_cma_dumb_create_internal(file_priv, drm, args); 40 } 41 42 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops); 43 44 static struct drm_driver sun4i_drv_driver = { 45 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC, 46 47 /* Generic Operations */ 48 .fops = &sun4i_drv_fops, 49 .name = "sun4i-drm", 50 .desc = "Allwinner sun4i Display Engine", 51 .date = "20150629", 52 .major = 1, 53 .minor = 0, 54 55 /* GEM Operations */ 56 .dumb_create = drm_sun4i_gem_dumb_create, 57 .gem_free_object_unlocked = drm_gem_cma_free_object, 58 .gem_vm_ops = &drm_gem_cma_vm_ops, 59 60 /* PRIME Operations */ 61 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 62 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 63 .gem_prime_import = drm_gem_prime_import, 64 .gem_prime_export = drm_gem_prime_export, 65 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 66 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 67 .gem_prime_vmap = drm_gem_cma_prime_vmap, 68 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 69 .gem_prime_mmap = drm_gem_cma_prime_mmap, 70 71 /* Frame Buffer Operations */ 72 }; 73 74 static int sun4i_drv_bind(struct device *dev) 75 { 76 struct drm_device *drm; 77 struct sun4i_drv *drv; 78 int ret; 79 80 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 81 if (IS_ERR(drm)) 82 return PTR_ERR(drm); 83 84 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 85 if (!drv) { 86 ret = -ENOMEM; 87 goto free_drm; 88 } 89 90 dev_set_drvdata(dev, drm); 91 drm->dev_private = drv; 92 INIT_LIST_HEAD(&drv->frontend_list); 93 INIT_LIST_HEAD(&drv->engine_list); 94 INIT_LIST_HEAD(&drv->tcon_list); 95 96 ret = of_reserved_mem_device_init(dev); 97 if (ret && ret != -ENODEV) { 98 dev_err(drm->dev, "Couldn't claim our memory region\n"); 99 goto free_drm; 100 } 101 102 drm_mode_config_init(drm); 103 drm->mode_config.allow_fb_modifiers = true; 104 105 ret = component_bind_all(drm->dev, drm); 106 if (ret) { 107 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 108 goto cleanup_mode_config; 109 } 110 111 /* drm_vblank_init calls kcalloc, which can fail */ 112 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 113 if (ret) 114 goto cleanup_mode_config; 115 116 drm->irq_enabled = true; 117 118 /* Remove early framebuffers (ie. simplefb) */ 119 drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false); 120 121 sun4i_framebuffer_init(drm); 122 123 /* Enable connectors polling */ 124 drm_kms_helper_poll_init(drm); 125 126 ret = drm_dev_register(drm, 0); 127 if (ret) 128 goto finish_poll; 129 130 drm_fbdev_generic_setup(drm, 32); 131 132 return 0; 133 134 finish_poll: 135 drm_kms_helper_poll_fini(drm); 136 cleanup_mode_config: 137 drm_mode_config_cleanup(drm); 138 of_reserved_mem_device_release(dev); 139 free_drm: 140 drm_dev_put(drm); 141 return ret; 142 } 143 144 static void sun4i_drv_unbind(struct device *dev) 145 { 146 struct drm_device *drm = dev_get_drvdata(dev); 147 148 drm_dev_unregister(drm); 149 drm_kms_helper_poll_fini(drm); 150 drm_atomic_helper_shutdown(drm); 151 drm_mode_config_cleanup(drm); 152 153 component_unbind_all(dev, NULL); 154 of_reserved_mem_device_release(dev); 155 156 drm_dev_put(drm); 157 } 158 159 static const struct component_master_ops sun4i_drv_master_ops = { 160 .bind = sun4i_drv_bind, 161 .unbind = sun4i_drv_unbind, 162 }; 163 164 static bool sun4i_drv_node_is_connector(struct device_node *node) 165 { 166 return of_device_is_compatible(node, "hdmi-connector"); 167 } 168 169 static bool sun4i_drv_node_is_frontend(struct device_node *node) 170 { 171 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 172 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 173 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 174 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 175 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") || 176 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") || 177 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend"); 178 } 179 180 static bool sun4i_drv_node_is_deu(struct device_node *node) 181 { 182 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu"); 183 } 184 185 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node) 186 { 187 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND)) 188 return !!of_match_node(sun4i_frontend_of_table, node); 189 190 return false; 191 } 192 193 static bool sun4i_drv_node_is_tcon(struct device_node *node) 194 { 195 return !!of_match_node(sun4i_tcon_of_table, node); 196 } 197 198 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node) 199 { 200 const struct of_device_id *match; 201 202 match = of_match_node(sun4i_tcon_of_table, node); 203 if (match) { 204 struct sun4i_tcon_quirks *quirks; 205 206 quirks = (struct sun4i_tcon_quirks *)match->data; 207 208 return quirks->has_channel_0; 209 } 210 211 return false; 212 } 213 214 static bool sun4i_drv_node_is_tcon_top(struct device_node *node) 215 { 216 return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && 217 !!of_match_node(sun8i_tcon_top_of_table, node); 218 } 219 220 static int compare_of(struct device *dev, void *data) 221 { 222 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", 223 dev->of_node, 224 data); 225 226 return dev->of_node == data; 227 } 228 229 /* 230 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 231 * crtcs from the device tree using of_graph. For the results to be 232 * correct, encoders must be probed/bound after _all_ crtcs have been 233 * created. The existing code uses a depth first recursive traversal 234 * of the of_graph, which means the encoders downstream of the TCON 235 * get add right after the first TCON. The second TCON or CRTC will 236 * never be properly associated with encoders connected to it. 237 * 238 * Also, in a dual display pipeline setup, both frontends can feed 239 * either backend, and both backends can feed either TCON, we want 240 * all components of the same type to be added before the next type 241 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 242 * i.e. components of the same type are at the same depth when counted 243 * from the frontend. The only exception is the third pipeline in 244 * the A80 SoC, which we do not support anyway. 245 * 246 * Hence we can use a breadth first search traversal order to add 247 * components. We do not need to check for duplicates. The component 248 * matching system handles this for us. 249 */ 250 struct endpoint_list { 251 DECLARE_KFIFO(fifo, struct device_node *, 16); 252 }; 253 254 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, 255 struct device_node *node, 256 int port_id) 257 { 258 struct device_node *ep, *remote, *port; 259 260 port = of_graph_get_port_by_id(node, port_id); 261 if (!port) { 262 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); 263 return; 264 } 265 266 for_each_available_child_of_node(port, ep) { 267 remote = of_graph_get_remote_port_parent(ep); 268 if (!remote) { 269 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 270 continue; 271 } 272 273 if (sun4i_drv_node_is_tcon(node)) { 274 /* 275 * TCON TOP is always probed before TCON. However, TCON 276 * points back to TCON TOP when it is source for HDMI. 277 * We have to skip it here to prevent infinite looping 278 * between TCON TOP and TCON. 279 */ 280 if (sun4i_drv_node_is_tcon_top(remote)) { 281 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); 282 of_node_put(remote); 283 continue; 284 } 285 286 /* 287 * If the node is our TCON with channel 0, the first 288 * port is used for panel or bridges, and will not be 289 * part of the component framework. 290 */ 291 if (sun4i_drv_node_is_tcon_with_ch0(node)) { 292 struct of_endpoint endpoint; 293 294 if (of_graph_parse_endpoint(ep, &endpoint)) { 295 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 296 of_node_put(remote); 297 continue; 298 } 299 300 if (!endpoint.id) { 301 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 302 of_node_put(remote); 303 continue; 304 } 305 } 306 } 307 308 kfifo_put(&list->fifo, remote); 309 } 310 } 311 312 static int sun4i_drv_add_endpoints(struct device *dev, 313 struct endpoint_list *list, 314 struct component_match **match, 315 struct device_node *node) 316 { 317 int count = 0; 318 319 /* 320 * The frontend has been disabled in some of our old device 321 * trees. If we find a node that is the frontend and is 322 * disabled, we should just follow through and parse its 323 * child, but without adding it to the component list. 324 * Otherwise, we obviously want to add it to the list. 325 */ 326 if (!sun4i_drv_node_is_frontend(node) && 327 !of_device_is_available(node)) 328 return 0; 329 330 /* 331 * The connectors will be the last nodes in our pipeline, we 332 * can just bail out. 333 */ 334 if (sun4i_drv_node_is_connector(node)) 335 return 0; 336 337 /* 338 * If the device is either just a regular device, or an 339 * enabled frontend supported by the driver, we add it to our 340 * component list. 341 */ 342 if (!(sun4i_drv_node_is_frontend(node) || 343 sun4i_drv_node_is_deu(node)) || 344 (sun4i_drv_node_is_supported_frontend(node) && 345 of_device_is_available(node))) { 346 /* Add current component */ 347 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 348 drm_of_component_match_add(dev, match, compare_of, node); 349 count++; 350 } 351 352 /* each node has at least one output */ 353 sun4i_drv_traverse_endpoints(list, node, 1); 354 355 /* TCON TOP has second and third output */ 356 if (sun4i_drv_node_is_tcon_top(node)) { 357 sun4i_drv_traverse_endpoints(list, node, 3); 358 sun4i_drv_traverse_endpoints(list, node, 5); 359 } 360 361 return count; 362 } 363 364 static int sun4i_drv_probe(struct platform_device *pdev) 365 { 366 struct component_match *match = NULL; 367 struct device_node *np = pdev->dev.of_node, *endpoint; 368 struct endpoint_list list; 369 int i, ret, count = 0; 370 371 INIT_KFIFO(list.fifo); 372 373 for (i = 0;; i++) { 374 struct device_node *pipeline = of_parse_phandle(np, 375 "allwinner,pipelines", 376 i); 377 if (!pipeline) 378 break; 379 380 kfifo_put(&list.fifo, pipeline); 381 } 382 383 while (kfifo_get(&list.fifo, &endpoint)) { 384 /* process this endpoint */ 385 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 386 endpoint); 387 388 /* sun4i_drv_add_endpoints can fail to allocate memory */ 389 if (ret < 0) 390 return ret; 391 392 count += ret; 393 } 394 395 if (count) 396 return component_master_add_with_match(&pdev->dev, 397 &sun4i_drv_master_ops, 398 match); 399 else 400 return 0; 401 } 402 403 static int sun4i_drv_remove(struct platform_device *pdev) 404 { 405 component_master_del(&pdev->dev, &sun4i_drv_master_ops); 406 407 return 0; 408 } 409 410 static const struct of_device_id sun4i_drv_of_table[] = { 411 { .compatible = "allwinner,sun4i-a10-display-engine" }, 412 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 413 { .compatible = "allwinner,sun5i-a13-display-engine" }, 414 { .compatible = "allwinner,sun6i-a31-display-engine" }, 415 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 416 { .compatible = "allwinner,sun7i-a20-display-engine" }, 417 { .compatible = "allwinner,sun8i-a23-display-engine" }, 418 { .compatible = "allwinner,sun8i-a33-display-engine" }, 419 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 420 { .compatible = "allwinner,sun8i-h3-display-engine" }, 421 { .compatible = "allwinner,sun8i-r40-display-engine" }, 422 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 423 { .compatible = "allwinner,sun9i-a80-display-engine" }, 424 { .compatible = "allwinner,sun50i-a64-display-engine" }, 425 { .compatible = "allwinner,sun50i-h6-display-engine" }, 426 { } 427 }; 428 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 429 430 static struct platform_driver sun4i_drv_platform_driver = { 431 .probe = sun4i_drv_probe, 432 .remove = sun4i_drv_remove, 433 .driver = { 434 .name = "sun4i-drm", 435 .of_match_table = sun4i_drv_of_table, 436 }, 437 }; 438 module_platform_driver(sun4i_drv_platform_driver); 439 440 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 441 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 442 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 443 MODULE_LICENSE("GPL"); 444