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_fb_cma_helper.h> 20 #include <drm/drm_fb_helper.h> 21 #include <drm/drm_gem_cma_helper.h> 22 #include <drm/drm_of.h> 23 #include <drm/drm_probe_helper.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 static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv, 32 struct drm_device *drm, 33 struct drm_mode_create_dumb *args) 34 { 35 /* The hardware only allows even pitches for YUV buffers. */ 36 args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2); 37 38 return drm_gem_cma_dumb_create_internal(file_priv, drm, args); 39 } 40 41 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops); 42 43 static struct drm_driver sun4i_drv_driver = { 44 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC, 45 46 /* Generic Operations */ 47 .fops = &sun4i_drv_fops, 48 .name = "sun4i-drm", 49 .desc = "Allwinner sun4i Display Engine", 50 .date = "20150629", 51 .major = 1, 52 .minor = 0, 53 54 /* GEM Operations */ 55 .dumb_create = drm_sun4i_gem_dumb_create, 56 .gem_free_object_unlocked = drm_gem_cma_free_object, 57 .gem_vm_ops = &drm_gem_cma_vm_ops, 58 59 /* PRIME Operations */ 60 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 61 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 62 .gem_prime_import = drm_gem_prime_import, 63 .gem_prime_export = drm_gem_prime_export, 64 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 65 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 66 .gem_prime_vmap = drm_gem_cma_prime_vmap, 67 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 68 .gem_prime_mmap = drm_gem_cma_prime_mmap, 69 70 /* Frame Buffer Operations */ 71 }; 72 73 static int sun4i_drv_bind(struct device *dev) 74 { 75 struct drm_device *drm; 76 struct sun4i_drv *drv; 77 int ret; 78 79 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 80 if (IS_ERR(drm)) 81 return PTR_ERR(drm); 82 83 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 84 if (!drv) { 85 ret = -ENOMEM; 86 goto free_drm; 87 } 88 drm->dev_private = drv; 89 INIT_LIST_HEAD(&drv->frontend_list); 90 INIT_LIST_HEAD(&drv->engine_list); 91 INIT_LIST_HEAD(&drv->tcon_list); 92 93 ret = of_reserved_mem_device_init(dev); 94 if (ret && ret != -ENODEV) { 95 dev_err(drm->dev, "Couldn't claim our memory region\n"); 96 goto free_drm; 97 } 98 99 drm_mode_config_init(drm); 100 drm->mode_config.allow_fb_modifiers = true; 101 102 ret = component_bind_all(drm->dev, drm); 103 if (ret) { 104 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 105 goto cleanup_mode_config; 106 } 107 108 /* drm_vblank_init calls kcalloc, which can fail */ 109 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 110 if (ret) 111 goto cleanup_mode_config; 112 113 drm->irq_enabled = true; 114 115 /* Remove early framebuffers (ie. simplefb) */ 116 drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false); 117 118 sun4i_framebuffer_init(drm); 119 120 /* Enable connectors polling */ 121 drm_kms_helper_poll_init(drm); 122 123 ret = drm_dev_register(drm, 0); 124 if (ret) 125 goto finish_poll; 126 127 drm_fbdev_generic_setup(drm, 32); 128 129 return 0; 130 131 finish_poll: 132 drm_kms_helper_poll_fini(drm); 133 cleanup_mode_config: 134 drm_mode_config_cleanup(drm); 135 of_reserved_mem_device_release(dev); 136 free_drm: 137 drm_dev_put(drm); 138 return ret; 139 } 140 141 static void sun4i_drv_unbind(struct device *dev) 142 { 143 struct drm_device *drm = dev_get_drvdata(dev); 144 145 drm_dev_unregister(drm); 146 drm_kms_helper_poll_fini(drm); 147 drm_mode_config_cleanup(drm); 148 of_reserved_mem_device_release(dev); 149 drm_dev_put(drm); 150 } 151 152 static const struct component_master_ops sun4i_drv_master_ops = { 153 .bind = sun4i_drv_bind, 154 .unbind = sun4i_drv_unbind, 155 }; 156 157 static bool sun4i_drv_node_is_connector(struct device_node *node) 158 { 159 return of_device_is_compatible(node, "hdmi-connector"); 160 } 161 162 static bool sun4i_drv_node_is_frontend(struct device_node *node) 163 { 164 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 165 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 166 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 167 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 168 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") || 169 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") || 170 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend"); 171 } 172 173 static bool sun4i_drv_node_is_deu(struct device_node *node) 174 { 175 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu"); 176 } 177 178 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node) 179 { 180 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND)) 181 return !!of_match_node(sun4i_frontend_of_table, node); 182 183 return false; 184 } 185 186 static bool sun4i_drv_node_is_tcon(struct device_node *node) 187 { 188 return !!of_match_node(sun4i_tcon_of_table, node); 189 } 190 191 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node) 192 { 193 const struct of_device_id *match; 194 195 match = of_match_node(sun4i_tcon_of_table, node); 196 if (match) { 197 struct sun4i_tcon_quirks *quirks; 198 199 quirks = (struct sun4i_tcon_quirks *)match->data; 200 201 return quirks->has_channel_0; 202 } 203 204 return false; 205 } 206 207 static bool sun4i_drv_node_is_tcon_top(struct device_node *node) 208 { 209 return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && 210 !!of_match_node(sun8i_tcon_top_of_table, node); 211 } 212 213 static int compare_of(struct device *dev, void *data) 214 { 215 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", 216 dev->of_node, 217 data); 218 219 return dev->of_node == data; 220 } 221 222 /* 223 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 224 * crtcs from the device tree using of_graph. For the results to be 225 * correct, encoders must be probed/bound after _all_ crtcs have been 226 * created. The existing code uses a depth first recursive traversal 227 * of the of_graph, which means the encoders downstream of the TCON 228 * get add right after the first TCON. The second TCON or CRTC will 229 * never be properly associated with encoders connected to it. 230 * 231 * Also, in a dual display pipeline setup, both frontends can feed 232 * either backend, and both backends can feed either TCON, we want 233 * all components of the same type to be added before the next type 234 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 235 * i.e. components of the same type are at the same depth when counted 236 * from the frontend. The only exception is the third pipeline in 237 * the A80 SoC, which we do not support anyway. 238 * 239 * Hence we can use a breadth first search traversal order to add 240 * components. We do not need to check for duplicates. The component 241 * matching system handles this for us. 242 */ 243 struct endpoint_list { 244 DECLARE_KFIFO(fifo, struct device_node *, 16); 245 }; 246 247 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, 248 struct device_node *node, 249 int port_id) 250 { 251 struct device_node *ep, *remote, *port; 252 253 port = of_graph_get_port_by_id(node, port_id); 254 if (!port) { 255 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); 256 return; 257 } 258 259 for_each_available_child_of_node(port, ep) { 260 remote = of_graph_get_remote_port_parent(ep); 261 if (!remote) { 262 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 263 continue; 264 } 265 266 if (sun4i_drv_node_is_tcon(node)) { 267 /* 268 * TCON TOP is always probed before TCON. However, TCON 269 * points back to TCON TOP when it is source for HDMI. 270 * We have to skip it here to prevent infinite looping 271 * between TCON TOP and TCON. 272 */ 273 if (sun4i_drv_node_is_tcon_top(remote)) { 274 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); 275 of_node_put(remote); 276 continue; 277 } 278 279 /* 280 * If the node is our TCON with channel 0, the first 281 * port is used for panel or bridges, and will not be 282 * part of the component framework. 283 */ 284 if (sun4i_drv_node_is_tcon_with_ch0(node)) { 285 struct of_endpoint endpoint; 286 287 if (of_graph_parse_endpoint(ep, &endpoint)) { 288 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 289 of_node_put(remote); 290 continue; 291 } 292 293 if (!endpoint.id) { 294 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 295 of_node_put(remote); 296 continue; 297 } 298 } 299 } 300 301 kfifo_put(&list->fifo, remote); 302 } 303 } 304 305 static int sun4i_drv_add_endpoints(struct device *dev, 306 struct endpoint_list *list, 307 struct component_match **match, 308 struct device_node *node) 309 { 310 int count = 0; 311 312 /* 313 * The frontend has been disabled in some of our old device 314 * trees. If we find a node that is the frontend and is 315 * disabled, we should just follow through and parse its 316 * child, but without adding it to the component list. 317 * Otherwise, we obviously want to add it to the list. 318 */ 319 if (!sun4i_drv_node_is_frontend(node) && 320 !of_device_is_available(node)) 321 return 0; 322 323 /* 324 * The connectors will be the last nodes in our pipeline, we 325 * can just bail out. 326 */ 327 if (sun4i_drv_node_is_connector(node)) 328 return 0; 329 330 /* 331 * If the device is either just a regular device, or an 332 * enabled frontend supported by the driver, we add it to our 333 * component list. 334 */ 335 if (!(sun4i_drv_node_is_frontend(node) || 336 sun4i_drv_node_is_deu(node)) || 337 (sun4i_drv_node_is_supported_frontend(node) && 338 of_device_is_available(node))) { 339 /* Add current component */ 340 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 341 drm_of_component_match_add(dev, match, compare_of, node); 342 count++; 343 } 344 345 /* each node has at least one output */ 346 sun4i_drv_traverse_endpoints(list, node, 1); 347 348 /* TCON TOP has second and third output */ 349 if (sun4i_drv_node_is_tcon_top(node)) { 350 sun4i_drv_traverse_endpoints(list, node, 3); 351 sun4i_drv_traverse_endpoints(list, node, 5); 352 } 353 354 return count; 355 } 356 357 static int sun4i_drv_probe(struct platform_device *pdev) 358 { 359 struct component_match *match = NULL; 360 struct device_node *np = pdev->dev.of_node, *endpoint; 361 struct endpoint_list list; 362 int i, ret, count = 0; 363 364 INIT_KFIFO(list.fifo); 365 366 for (i = 0;; i++) { 367 struct device_node *pipeline = of_parse_phandle(np, 368 "allwinner,pipelines", 369 i); 370 if (!pipeline) 371 break; 372 373 kfifo_put(&list.fifo, pipeline); 374 } 375 376 while (kfifo_get(&list.fifo, &endpoint)) { 377 /* process this endpoint */ 378 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 379 endpoint); 380 381 /* sun4i_drv_add_endpoints can fail to allocate memory */ 382 if (ret < 0) 383 return ret; 384 385 count += ret; 386 } 387 388 if (count) 389 return component_master_add_with_match(&pdev->dev, 390 &sun4i_drv_master_ops, 391 match); 392 else 393 return 0; 394 } 395 396 static int sun4i_drv_remove(struct platform_device *pdev) 397 { 398 return 0; 399 } 400 401 static const struct of_device_id sun4i_drv_of_table[] = { 402 { .compatible = "allwinner,sun4i-a10-display-engine" }, 403 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 404 { .compatible = "allwinner,sun5i-a13-display-engine" }, 405 { .compatible = "allwinner,sun6i-a31-display-engine" }, 406 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 407 { .compatible = "allwinner,sun7i-a20-display-engine" }, 408 { .compatible = "allwinner,sun8i-a23-display-engine" }, 409 { .compatible = "allwinner,sun8i-a33-display-engine" }, 410 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 411 { .compatible = "allwinner,sun8i-h3-display-engine" }, 412 { .compatible = "allwinner,sun8i-r40-display-engine" }, 413 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 414 { .compatible = "allwinner,sun9i-a80-display-engine" }, 415 { .compatible = "allwinner,sun50i-a64-display-engine" }, 416 { .compatible = "allwinner,sun50i-h6-display-engine" }, 417 { } 418 }; 419 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 420 421 static struct platform_driver sun4i_drv_platform_driver = { 422 .probe = sun4i_drv_probe, 423 .remove = sun4i_drv_remove, 424 .driver = { 425 .name = "sun4i-drm", 426 .of_match_table = sun4i_drv_of_table, 427 }, 428 }; 429 module_platform_driver(sun4i_drv_platform_driver); 430 431 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 432 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 433 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 434 MODULE_LICENSE("GPL"); 435