1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2015 Free Electrons 4 * Copyright (C) 2015 NextThing Co 5 * 6 * Maxime Ripard <maxime.ripard@free-electrons.com> 7 */ 8 9 #include <linux/component.h> 10 #include <linux/kfifo.h> 11 #include <linux/module.h> 12 #include <linux/of_graph.h> 13 #include <linux/of_reserved_mem.h> 14 #include <linux/platform_device.h> 15 16 #include <drm/drm_atomic_helper.h> 17 #include <drm/drm_drv.h> 18 #include <drm/drm_fb_cma_helper.h> 19 #include <drm/drm_fb_helper.h> 20 #include <drm/drm_gem_cma_helper.h> 21 #include <drm/drm_of.h> 22 #include <drm/drm_probe_helper.h> 23 #include <drm/drm_vblank.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 const struct drm_driver sun4i_drv_driver = { 44 .driver_features = DRIVER_GEM | DRIVER_MODESET | 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 DRM_GEM_CMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(drm_sun4i_gem_dumb_create), 56 }; 57 58 static int sun4i_drv_bind(struct device *dev) 59 { 60 struct drm_device *drm; 61 struct sun4i_drv *drv; 62 int ret; 63 64 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 65 if (IS_ERR(drm)) 66 return PTR_ERR(drm); 67 68 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 69 if (!drv) { 70 ret = -ENOMEM; 71 goto free_drm; 72 } 73 74 dev_set_drvdata(dev, drm); 75 drm->dev_private = drv; 76 INIT_LIST_HEAD(&drv->frontend_list); 77 INIT_LIST_HEAD(&drv->engine_list); 78 INIT_LIST_HEAD(&drv->tcon_list); 79 80 ret = of_reserved_mem_device_init(dev); 81 if (ret && ret != -ENODEV) { 82 dev_err(drm->dev, "Couldn't claim our memory region\n"); 83 goto free_drm; 84 } 85 86 drm_mode_config_init(drm); 87 88 ret = component_bind_all(drm->dev, drm); 89 if (ret) { 90 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 91 goto cleanup_mode_config; 92 } 93 94 /* drm_vblank_init calls kcalloc, which can fail */ 95 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 96 if (ret) 97 goto cleanup_mode_config; 98 99 drm->irq_enabled = true; 100 101 /* Remove early framebuffers (ie. simplefb) */ 102 drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false); 103 104 sun4i_framebuffer_init(drm); 105 106 /* Enable connectors polling */ 107 drm_kms_helper_poll_init(drm); 108 109 ret = drm_dev_register(drm, 0); 110 if (ret) 111 goto finish_poll; 112 113 drm_fbdev_generic_setup(drm, 32); 114 115 return 0; 116 117 finish_poll: 118 drm_kms_helper_poll_fini(drm); 119 cleanup_mode_config: 120 drm_mode_config_cleanup(drm); 121 of_reserved_mem_device_release(dev); 122 free_drm: 123 drm_dev_put(drm); 124 return ret; 125 } 126 127 static void sun4i_drv_unbind(struct device *dev) 128 { 129 struct drm_device *drm = dev_get_drvdata(dev); 130 131 drm_dev_unregister(drm); 132 drm_kms_helper_poll_fini(drm); 133 drm_atomic_helper_shutdown(drm); 134 drm_mode_config_cleanup(drm); 135 136 component_unbind_all(dev, NULL); 137 of_reserved_mem_device_release(dev); 138 139 drm_dev_put(drm); 140 } 141 142 static const struct component_master_ops sun4i_drv_master_ops = { 143 .bind = sun4i_drv_bind, 144 .unbind = sun4i_drv_unbind, 145 }; 146 147 static bool sun4i_drv_node_is_connector(struct device_node *node) 148 { 149 return of_device_is_compatible(node, "hdmi-connector"); 150 } 151 152 static bool sun4i_drv_node_is_frontend(struct device_node *node) 153 { 154 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 155 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 156 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 157 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 158 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") || 159 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") || 160 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend"); 161 } 162 163 static bool sun4i_drv_node_is_deu(struct device_node *node) 164 { 165 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu"); 166 } 167 168 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node) 169 { 170 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND)) 171 return !!of_match_node(sun4i_frontend_of_table, node); 172 173 return false; 174 } 175 176 static bool sun4i_drv_node_is_tcon(struct device_node *node) 177 { 178 return !!of_match_node(sun4i_tcon_of_table, node); 179 } 180 181 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node) 182 { 183 const struct of_device_id *match; 184 185 match = of_match_node(sun4i_tcon_of_table, node); 186 if (match) { 187 struct sun4i_tcon_quirks *quirks; 188 189 quirks = (struct sun4i_tcon_quirks *)match->data; 190 191 return quirks->has_channel_0; 192 } 193 194 return false; 195 } 196 197 static bool sun4i_drv_node_is_tcon_top(struct device_node *node) 198 { 199 return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && 200 !!of_match_node(sun8i_tcon_top_of_table, node); 201 } 202 203 static int compare_of(struct device *dev, void *data) 204 { 205 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", 206 dev->of_node, 207 data); 208 209 return dev->of_node == data; 210 } 211 212 /* 213 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 214 * crtcs from the device tree using of_graph. For the results to be 215 * correct, encoders must be probed/bound after _all_ crtcs have been 216 * created. The existing code uses a depth first recursive traversal 217 * of the of_graph, which means the encoders downstream of the TCON 218 * get add right after the first TCON. The second TCON or CRTC will 219 * never be properly associated with encoders connected to it. 220 * 221 * Also, in a dual display pipeline setup, both frontends can feed 222 * either backend, and both backends can feed either TCON, we want 223 * all components of the same type to be added before the next type 224 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 225 * i.e. components of the same type are at the same depth when counted 226 * from the frontend. The only exception is the third pipeline in 227 * the A80 SoC, which we do not support anyway. 228 * 229 * Hence we can use a breadth first search traversal order to add 230 * components. We do not need to check for duplicates. The component 231 * matching system handles this for us. 232 */ 233 struct endpoint_list { 234 DECLARE_KFIFO(fifo, struct device_node *, 16); 235 }; 236 237 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, 238 struct device_node *node, 239 int port_id) 240 { 241 struct device_node *ep, *remote, *port; 242 243 port = of_graph_get_port_by_id(node, port_id); 244 if (!port) { 245 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); 246 return; 247 } 248 249 for_each_available_child_of_node(port, ep) { 250 remote = of_graph_get_remote_port_parent(ep); 251 if (!remote) { 252 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 253 continue; 254 } 255 256 if (sun4i_drv_node_is_tcon(node)) { 257 /* 258 * TCON TOP is always probed before TCON. However, TCON 259 * points back to TCON TOP when it is source for HDMI. 260 * We have to skip it here to prevent infinite looping 261 * between TCON TOP and TCON. 262 */ 263 if (sun4i_drv_node_is_tcon_top(remote)) { 264 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); 265 of_node_put(remote); 266 continue; 267 } 268 269 /* 270 * If the node is our TCON with channel 0, the first 271 * port is used for panel or bridges, and will not be 272 * part of the component framework. 273 */ 274 if (sun4i_drv_node_is_tcon_with_ch0(node)) { 275 struct of_endpoint endpoint; 276 277 if (of_graph_parse_endpoint(ep, &endpoint)) { 278 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 279 of_node_put(remote); 280 continue; 281 } 282 283 if (!endpoint.id) { 284 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 285 of_node_put(remote); 286 continue; 287 } 288 } 289 } 290 291 kfifo_put(&list->fifo, remote); 292 } 293 } 294 295 static int sun4i_drv_add_endpoints(struct device *dev, 296 struct endpoint_list *list, 297 struct component_match **match, 298 struct device_node *node) 299 { 300 int count = 0; 301 302 /* 303 * The frontend has been disabled in some of our old device 304 * trees. If we find a node that is the frontend and is 305 * disabled, we should just follow through and parse its 306 * child, but without adding it to the component list. 307 * Otherwise, we obviously want to add it to the list. 308 */ 309 if (!sun4i_drv_node_is_frontend(node) && 310 !of_device_is_available(node)) 311 return 0; 312 313 /* 314 * The connectors will be the last nodes in our pipeline, we 315 * can just bail out. 316 */ 317 if (sun4i_drv_node_is_connector(node)) 318 return 0; 319 320 /* 321 * If the device is either just a regular device, or an 322 * enabled frontend supported by the driver, we add it to our 323 * component list. 324 */ 325 if (!(sun4i_drv_node_is_frontend(node) || 326 sun4i_drv_node_is_deu(node)) || 327 (sun4i_drv_node_is_supported_frontend(node) && 328 of_device_is_available(node))) { 329 /* Add current component */ 330 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 331 drm_of_component_match_add(dev, match, compare_of, node); 332 count++; 333 } 334 335 /* each node has at least one output */ 336 sun4i_drv_traverse_endpoints(list, node, 1); 337 338 /* TCON TOP has second and third output */ 339 if (sun4i_drv_node_is_tcon_top(node)) { 340 sun4i_drv_traverse_endpoints(list, node, 3); 341 sun4i_drv_traverse_endpoints(list, node, 5); 342 } 343 344 return count; 345 } 346 347 #ifdef CONFIG_PM_SLEEP 348 static int sun4i_drv_drm_sys_suspend(struct device *dev) 349 { 350 struct drm_device *drm = dev_get_drvdata(dev); 351 352 return drm_mode_config_helper_suspend(drm); 353 } 354 355 static int sun4i_drv_drm_sys_resume(struct device *dev) 356 { 357 struct drm_device *drm = dev_get_drvdata(dev); 358 359 return drm_mode_config_helper_resume(drm); 360 } 361 #endif 362 363 static const struct dev_pm_ops sun4i_drv_drm_pm_ops = { 364 SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend, 365 sun4i_drv_drm_sys_resume) 366 }; 367 368 static int sun4i_drv_probe(struct platform_device *pdev) 369 { 370 struct component_match *match = NULL; 371 struct device_node *np = pdev->dev.of_node, *endpoint; 372 struct endpoint_list list; 373 int i, ret, count = 0; 374 375 INIT_KFIFO(list.fifo); 376 377 for (i = 0;; i++) { 378 struct device_node *pipeline = of_parse_phandle(np, 379 "allwinner,pipelines", 380 i); 381 if (!pipeline) 382 break; 383 384 kfifo_put(&list.fifo, pipeline); 385 } 386 387 while (kfifo_get(&list.fifo, &endpoint)) { 388 /* process this endpoint */ 389 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 390 endpoint); 391 392 /* sun4i_drv_add_endpoints can fail to allocate memory */ 393 if (ret < 0) 394 return ret; 395 396 count += ret; 397 } 398 399 if (count) 400 return component_master_add_with_match(&pdev->dev, 401 &sun4i_drv_master_ops, 402 match); 403 else 404 return 0; 405 } 406 407 static int sun4i_drv_remove(struct platform_device *pdev) 408 { 409 component_master_del(&pdev->dev, &sun4i_drv_master_ops); 410 411 return 0; 412 } 413 414 static const struct of_device_id sun4i_drv_of_table[] = { 415 { .compatible = "allwinner,sun4i-a10-display-engine" }, 416 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 417 { .compatible = "allwinner,sun5i-a13-display-engine" }, 418 { .compatible = "allwinner,sun6i-a31-display-engine" }, 419 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 420 { .compatible = "allwinner,sun7i-a20-display-engine" }, 421 { .compatible = "allwinner,sun8i-a23-display-engine" }, 422 { .compatible = "allwinner,sun8i-a33-display-engine" }, 423 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 424 { .compatible = "allwinner,sun8i-h3-display-engine" }, 425 { .compatible = "allwinner,sun8i-r40-display-engine" }, 426 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 427 { .compatible = "allwinner,sun9i-a80-display-engine" }, 428 { .compatible = "allwinner,sun50i-a64-display-engine" }, 429 { .compatible = "allwinner,sun50i-h6-display-engine" }, 430 { } 431 }; 432 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 433 434 static struct platform_driver sun4i_drv_platform_driver = { 435 .probe = sun4i_drv_probe, 436 .remove = sun4i_drv_remove, 437 .driver = { 438 .name = "sun4i-drm", 439 .of_match_table = sun4i_drv_of_table, 440 .pm = &sun4i_drv_drm_pm_ops, 441 }, 442 }; 443 module_platform_driver(sun4i_drv_platform_driver); 444 445 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 446 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 447 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 448 MODULE_LICENSE("GPL"); 449