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 void sun4i_remove_framebuffers(void) 65 { 66 struct apertures_struct *ap; 67 68 ap = alloc_apertures(1); 69 if (!ap) 70 return; 71 72 /* The framebuffer can be located anywhere in RAM */ 73 ap->ranges[0].base = 0; 74 ap->ranges[0].size = ~0; 75 76 drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false); 77 kfree(ap); 78 } 79 80 static int sun4i_drv_bind(struct device *dev) 81 { 82 struct drm_device *drm; 83 struct sun4i_drv *drv; 84 int ret; 85 86 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 87 if (IS_ERR(drm)) 88 return PTR_ERR(drm); 89 90 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 91 if (!drv) { 92 ret = -ENOMEM; 93 goto free_drm; 94 } 95 drm->dev_private = drv; 96 INIT_LIST_HEAD(&drv->frontend_list); 97 INIT_LIST_HEAD(&drv->engine_list); 98 INIT_LIST_HEAD(&drv->tcon_list); 99 100 ret = of_reserved_mem_device_init(dev); 101 if (ret && ret != -ENODEV) { 102 dev_err(drm->dev, "Couldn't claim our memory region\n"); 103 goto free_drm; 104 } 105 106 drm_mode_config_init(drm); 107 108 ret = component_bind_all(drm->dev, drm); 109 if (ret) { 110 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 111 goto cleanup_mode_config; 112 } 113 114 /* drm_vblank_init calls kcalloc, which can fail */ 115 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 116 if (ret) 117 goto cleanup_mode_config; 118 119 drm->irq_enabled = true; 120 121 /* Remove early framebuffers (ie. simplefb) */ 122 sun4i_remove_framebuffers(); 123 124 /* Create our framebuffer */ 125 ret = sun4i_framebuffer_init(drm); 126 if (ret) { 127 dev_err(drm->dev, "Couldn't create our framebuffer\n"); 128 goto cleanup_mode_config; 129 } 130 131 /* Enable connectors polling */ 132 drm_kms_helper_poll_init(drm); 133 134 ret = drm_dev_register(drm, 0); 135 if (ret) 136 goto finish_poll; 137 138 return 0; 139 140 finish_poll: 141 drm_kms_helper_poll_fini(drm); 142 sun4i_framebuffer_free(drm); 143 cleanup_mode_config: 144 drm_mode_config_cleanup(drm); 145 of_reserved_mem_device_release(dev); 146 free_drm: 147 drm_dev_unref(drm); 148 return ret; 149 } 150 151 static void sun4i_drv_unbind(struct device *dev) 152 { 153 struct drm_device *drm = dev_get_drvdata(dev); 154 155 drm_dev_unregister(drm); 156 drm_kms_helper_poll_fini(drm); 157 sun4i_framebuffer_free(drm); 158 drm_mode_config_cleanup(drm); 159 of_reserved_mem_device_release(dev); 160 drm_dev_unref(drm); 161 } 162 163 static const struct component_master_ops sun4i_drv_master_ops = { 164 .bind = sun4i_drv_bind, 165 .unbind = sun4i_drv_unbind, 166 }; 167 168 static bool sun4i_drv_node_is_connector(struct device_node *node) 169 { 170 return of_device_is_compatible(node, "hdmi-connector"); 171 } 172 173 static bool sun4i_drv_node_is_frontend(struct device_node *node) 174 { 175 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 176 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 177 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 178 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 179 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") || 180 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend"); 181 } 182 183 static bool sun4i_drv_node_is_deu(struct device_node *node) 184 { 185 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu"); 186 } 187 188 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node) 189 { 190 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND)) 191 return !!of_match_node(sun4i_frontend_of_table, node); 192 193 return false; 194 } 195 196 static bool sun4i_drv_node_is_tcon(struct device_node *node) 197 { 198 return !!of_match_node(sun4i_tcon_of_table, node); 199 } 200 201 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node) 202 { 203 const struct of_device_id *match; 204 205 match = of_match_node(sun4i_tcon_of_table, node); 206 if (match) { 207 struct sun4i_tcon_quirks *quirks; 208 209 quirks = (struct sun4i_tcon_quirks *)match->data; 210 211 return quirks->has_channel_0; 212 } 213 214 return false; 215 } 216 217 static bool sun4i_drv_node_is_tcon_top(struct device_node *node) 218 { 219 return !!of_match_node(sun8i_tcon_top_of_table, node); 220 } 221 222 static int compare_of(struct device *dev, void *data) 223 { 224 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", 225 dev->of_node, 226 data); 227 228 return dev->of_node == data; 229 } 230 231 /* 232 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 233 * crtcs from the device tree using of_graph. For the results to be 234 * correct, encoders must be probed/bound after _all_ crtcs have been 235 * created. The existing code uses a depth first recursive traversal 236 * of the of_graph, which means the encoders downstream of the TCON 237 * get add right after the first TCON. The second TCON or CRTC will 238 * never be properly associated with encoders connected to it. 239 * 240 * Also, in a dual display pipeline setup, both frontends can feed 241 * either backend, and both backends can feed either TCON, we want 242 * all components of the same type to be added before the next type 243 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 244 * i.e. components of the same type are at the same depth when counted 245 * from the frontend. The only exception is the third pipeline in 246 * the A80 SoC, which we do not support anyway. 247 * 248 * Hence we can use a breadth first search traversal order to add 249 * components. We do not need to check for duplicates. The component 250 * matching system handles this for us. 251 */ 252 struct endpoint_list { 253 DECLARE_KFIFO(fifo, struct device_node *, 16); 254 }; 255 256 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, 257 struct device_node *node, 258 int port_id) 259 { 260 struct device_node *ep, *remote, *port; 261 262 port = of_graph_get_port_by_id(node, port_id); 263 if (!port) { 264 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); 265 return; 266 } 267 268 for_each_available_child_of_node(port, ep) { 269 remote = of_graph_get_remote_port_parent(ep); 270 if (!remote) { 271 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 272 continue; 273 } 274 275 if (sun4i_drv_node_is_tcon(node)) { 276 /* 277 * TCON TOP is always probed before TCON. However, TCON 278 * points back to TCON TOP when it is source for HDMI. 279 * We have to skip it here to prevent infinite looping 280 * between TCON TOP and TCON. 281 */ 282 if (sun4i_drv_node_is_tcon_top(remote)) { 283 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); 284 of_node_put(remote); 285 continue; 286 } 287 288 /* 289 * If the node is our TCON with channel 0, the first 290 * port is used for panel or bridges, and will not be 291 * part of the component framework. 292 */ 293 if (sun4i_drv_node_is_tcon_with_ch0(node)) { 294 struct of_endpoint endpoint; 295 296 if (of_graph_parse_endpoint(ep, &endpoint)) { 297 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 298 of_node_put(remote); 299 continue; 300 } 301 302 if (!endpoint.id) { 303 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 304 of_node_put(remote); 305 continue; 306 } 307 } 308 } 309 310 kfifo_put(&list->fifo, remote); 311 } 312 } 313 314 static int sun4i_drv_add_endpoints(struct device *dev, 315 struct endpoint_list *list, 316 struct component_match **match, 317 struct device_node *node) 318 { 319 int count = 0; 320 321 /* 322 * The frontend has been disabled in some of our old device 323 * trees. If we find a node that is the frontend and is 324 * disabled, we should just follow through and parse its 325 * child, but without adding it to the component list. 326 * Otherwise, we obviously want to add it to the list. 327 */ 328 if (!sun4i_drv_node_is_frontend(node) && 329 !of_device_is_available(node)) 330 return 0; 331 332 /* 333 * The connectors will be the last nodes in our pipeline, we 334 * can just bail out. 335 */ 336 if (sun4i_drv_node_is_connector(node)) 337 return 0; 338 339 /* 340 * If the device is either just a regular device, or an 341 * enabled frontend supported by the driver, we add it to our 342 * component list. 343 */ 344 if (!(sun4i_drv_node_is_frontend(node) || 345 sun4i_drv_node_is_deu(node)) || 346 (sun4i_drv_node_is_supported_frontend(node) && 347 of_device_is_available(node))) { 348 /* Add current component */ 349 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 350 drm_of_component_match_add(dev, match, compare_of, node); 351 count++; 352 } 353 354 /* each node has at least one output */ 355 sun4i_drv_traverse_endpoints(list, node, 1); 356 357 /* TCON TOP has second and third output */ 358 if (sun4i_drv_node_is_tcon_top(node)) { 359 sun4i_drv_traverse_endpoints(list, node, 3); 360 sun4i_drv_traverse_endpoints(list, node, 5); 361 } 362 363 return count; 364 } 365 366 static int sun4i_drv_probe(struct platform_device *pdev) 367 { 368 struct component_match *match = NULL; 369 struct device_node *np = pdev->dev.of_node, *endpoint; 370 struct endpoint_list list; 371 int i, ret, count = 0; 372 373 INIT_KFIFO(list.fifo); 374 375 for (i = 0;; i++) { 376 struct device_node *pipeline = of_parse_phandle(np, 377 "allwinner,pipelines", 378 i); 379 if (!pipeline) 380 break; 381 382 kfifo_put(&list.fifo, pipeline); 383 } 384 385 while (kfifo_get(&list.fifo, &endpoint)) { 386 /* process this endpoint */ 387 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 388 endpoint); 389 390 /* sun4i_drv_add_endpoints can fail to allocate memory */ 391 if (ret < 0) 392 return ret; 393 394 count += ret; 395 } 396 397 if (count) 398 return component_master_add_with_match(&pdev->dev, 399 &sun4i_drv_master_ops, 400 match); 401 else 402 return 0; 403 } 404 405 static int sun4i_drv_remove(struct platform_device *pdev) 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-a33-display-engine" }, 418 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 419 { .compatible = "allwinner,sun8i-h3-display-engine" }, 420 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 421 { .compatible = "allwinner,sun9i-a80-display-engine" }, 422 { } 423 }; 424 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 425 426 static struct platform_driver sun4i_drv_platform_driver = { 427 .probe = sun4i_drv_probe, 428 .remove = sun4i_drv_remove, 429 .driver = { 430 .name = "sun4i-drm", 431 .of_match_table = sun4i_drv_of_table, 432 }, 433 }; 434 module_platform_driver(sun4i_drv_platform_driver); 435 436 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 437 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 438 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 439 MODULE_LICENSE("GPL"); 440