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