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_aperture.h> 17 #include <drm/drm_atomic_helper.h> 18 #include <drm/drm_drv.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 #include <drm/drm_vblank.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 const struct drm_driver sun4i_drv_driver = { 45 .driver_features = DRIVER_GEM | DRIVER_MODESET | 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 DRM_GEM_CMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(drm_sun4i_gem_dumb_create), 57 }; 58 59 static int sun4i_drv_bind(struct device *dev) 60 { 61 struct drm_device *drm; 62 struct sun4i_drv *drv; 63 int ret; 64 65 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 66 if (IS_ERR(drm)) 67 return PTR_ERR(drm); 68 69 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 70 if (!drv) { 71 ret = -ENOMEM; 72 goto free_drm; 73 } 74 75 dev_set_drvdata(dev, drm); 76 drm->dev_private = drv; 77 INIT_LIST_HEAD(&drv->frontend_list); 78 INIT_LIST_HEAD(&drv->engine_list); 79 INIT_LIST_HEAD(&drv->tcon_list); 80 81 ret = of_reserved_mem_device_init(dev); 82 if (ret && ret != -ENODEV) { 83 dev_err(drm->dev, "Couldn't claim our memory region\n"); 84 goto free_drm; 85 } 86 87 drm_mode_config_init(drm); 88 89 ret = component_bind_all(drm->dev, drm); 90 if (ret) { 91 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 92 goto cleanup_mode_config; 93 } 94 95 /* drm_vblank_init calls kcalloc, which can fail */ 96 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 97 if (ret) 98 goto cleanup_mode_config; 99 100 drm->irq_enabled = true; 101 102 /* Remove early framebuffers (ie. simplefb) */ 103 ret = drm_aperture_remove_framebuffers(false, "sun4i-drm-fb"); 104 if (ret) 105 goto cleanup_mode_config; 106 107 sun4i_framebuffer_init(drm); 108 109 /* Enable connectors polling */ 110 drm_kms_helper_poll_init(drm); 111 112 ret = drm_dev_register(drm, 0); 113 if (ret) 114 goto finish_poll; 115 116 drm_fbdev_generic_setup(drm, 32); 117 118 return 0; 119 120 finish_poll: 121 drm_kms_helper_poll_fini(drm); 122 cleanup_mode_config: 123 drm_mode_config_cleanup(drm); 124 of_reserved_mem_device_release(dev); 125 free_drm: 126 drm_dev_put(drm); 127 return ret; 128 } 129 130 static void sun4i_drv_unbind(struct device *dev) 131 { 132 struct drm_device *drm = dev_get_drvdata(dev); 133 134 drm_dev_unregister(drm); 135 drm_kms_helper_poll_fini(drm); 136 drm_atomic_helper_shutdown(drm); 137 drm_mode_config_cleanup(drm); 138 139 component_unbind_all(dev, NULL); 140 of_reserved_mem_device_release(dev); 141 142 drm_dev_put(drm); 143 } 144 145 static const struct component_master_ops sun4i_drv_master_ops = { 146 .bind = sun4i_drv_bind, 147 .unbind = sun4i_drv_unbind, 148 }; 149 150 static bool sun4i_drv_node_is_connector(struct device_node *node) 151 { 152 return of_device_is_compatible(node, "hdmi-connector"); 153 } 154 155 static bool sun4i_drv_node_is_frontend(struct device_node *node) 156 { 157 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 158 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 159 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 160 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 161 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") || 162 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") || 163 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend"); 164 } 165 166 static bool sun4i_drv_node_is_deu(struct device_node *node) 167 { 168 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu"); 169 } 170 171 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node) 172 { 173 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND)) 174 return !!of_match_node(sun4i_frontend_of_table, node); 175 176 return false; 177 } 178 179 static bool sun4i_drv_node_is_tcon(struct device_node *node) 180 { 181 return !!of_match_node(sun4i_tcon_of_table, node); 182 } 183 184 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node) 185 { 186 const struct of_device_id *match; 187 188 match = of_match_node(sun4i_tcon_of_table, node); 189 if (match) { 190 struct sun4i_tcon_quirks *quirks; 191 192 quirks = (struct sun4i_tcon_quirks *)match->data; 193 194 return quirks->has_channel_0; 195 } 196 197 return false; 198 } 199 200 static bool sun4i_drv_node_is_tcon_top(struct device_node *node) 201 { 202 return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && 203 !!of_match_node(sun8i_tcon_top_of_table, node); 204 } 205 206 static int compare_of(struct device *dev, void *data) 207 { 208 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", 209 dev->of_node, 210 data); 211 212 return dev->of_node == data; 213 } 214 215 /* 216 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 217 * crtcs from the device tree using of_graph. For the results to be 218 * correct, encoders must be probed/bound after _all_ crtcs have been 219 * created. The existing code uses a depth first recursive traversal 220 * of the of_graph, which means the encoders downstream of the TCON 221 * get add right after the first TCON. The second TCON or CRTC will 222 * never be properly associated with encoders connected to it. 223 * 224 * Also, in a dual display pipeline setup, both frontends can feed 225 * either backend, and both backends can feed either TCON, we want 226 * all components of the same type to be added before the next type 227 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 228 * i.e. components of the same type are at the same depth when counted 229 * from the frontend. The only exception is the third pipeline in 230 * the A80 SoC, which we do not support anyway. 231 * 232 * Hence we can use a breadth first search traversal order to add 233 * components. We do not need to check for duplicates. The component 234 * matching system handles this for us. 235 */ 236 struct endpoint_list { 237 DECLARE_KFIFO(fifo, struct device_node *, 16); 238 }; 239 240 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, 241 struct device_node *node, 242 int port_id) 243 { 244 struct device_node *ep, *remote, *port; 245 246 port = of_graph_get_port_by_id(node, port_id); 247 if (!port) { 248 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); 249 return; 250 } 251 252 for_each_available_child_of_node(port, ep) { 253 remote = of_graph_get_remote_port_parent(ep); 254 if (!remote) { 255 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 256 continue; 257 } 258 259 if (sun4i_drv_node_is_tcon(node)) { 260 /* 261 * TCON TOP is always probed before TCON. However, TCON 262 * points back to TCON TOP when it is source for HDMI. 263 * We have to skip it here to prevent infinite looping 264 * between TCON TOP and TCON. 265 */ 266 if (sun4i_drv_node_is_tcon_top(remote)) { 267 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); 268 of_node_put(remote); 269 continue; 270 } 271 272 /* 273 * If the node is our TCON with channel 0, the first 274 * port is used for panel or bridges, and will not be 275 * part of the component framework. 276 */ 277 if (sun4i_drv_node_is_tcon_with_ch0(node)) { 278 struct of_endpoint endpoint; 279 280 if (of_graph_parse_endpoint(ep, &endpoint)) { 281 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 282 of_node_put(remote); 283 continue; 284 } 285 286 if (!endpoint.id) { 287 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 288 of_node_put(remote); 289 continue; 290 } 291 } 292 } 293 294 kfifo_put(&list->fifo, remote); 295 } 296 } 297 298 static int sun4i_drv_add_endpoints(struct device *dev, 299 struct endpoint_list *list, 300 struct component_match **match, 301 struct device_node *node) 302 { 303 int count = 0; 304 305 /* 306 * The frontend has been disabled in some of our old device 307 * trees. If we find a node that is the frontend and is 308 * disabled, we should just follow through and parse its 309 * child, but without adding it to the component list. 310 * Otherwise, we obviously want to add it to the list. 311 */ 312 if (!sun4i_drv_node_is_frontend(node) && 313 !of_device_is_available(node)) 314 return 0; 315 316 /* 317 * The connectors will be the last nodes in our pipeline, we 318 * can just bail out. 319 */ 320 if (sun4i_drv_node_is_connector(node)) 321 return 0; 322 323 /* 324 * If the device is either just a regular device, or an 325 * enabled frontend supported by the driver, we add it to our 326 * component list. 327 */ 328 if (!(sun4i_drv_node_is_frontend(node) || 329 sun4i_drv_node_is_deu(node)) || 330 (sun4i_drv_node_is_supported_frontend(node) && 331 of_device_is_available(node))) { 332 /* Add current component */ 333 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 334 drm_of_component_match_add(dev, match, compare_of, node); 335 count++; 336 } 337 338 /* each node has at least one output */ 339 sun4i_drv_traverse_endpoints(list, node, 1); 340 341 /* TCON TOP has second and third output */ 342 if (sun4i_drv_node_is_tcon_top(node)) { 343 sun4i_drv_traverse_endpoints(list, node, 3); 344 sun4i_drv_traverse_endpoints(list, node, 5); 345 } 346 347 return count; 348 } 349 350 #ifdef CONFIG_PM_SLEEP 351 static int sun4i_drv_drm_sys_suspend(struct device *dev) 352 { 353 struct drm_device *drm = dev_get_drvdata(dev); 354 355 return drm_mode_config_helper_suspend(drm); 356 } 357 358 static int sun4i_drv_drm_sys_resume(struct device *dev) 359 { 360 struct drm_device *drm = dev_get_drvdata(dev); 361 362 return drm_mode_config_helper_resume(drm); 363 } 364 #endif 365 366 static const struct dev_pm_ops sun4i_drv_drm_pm_ops = { 367 SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend, 368 sun4i_drv_drm_sys_resume) 369 }; 370 371 static int sun4i_drv_probe(struct platform_device *pdev) 372 { 373 struct component_match *match = NULL; 374 struct device_node *np = pdev->dev.of_node, *endpoint; 375 struct endpoint_list list; 376 int i, ret, count = 0; 377 378 INIT_KFIFO(list.fifo); 379 380 for (i = 0;; i++) { 381 struct device_node *pipeline = of_parse_phandle(np, 382 "allwinner,pipelines", 383 i); 384 if (!pipeline) 385 break; 386 387 kfifo_put(&list.fifo, pipeline); 388 } 389 390 while (kfifo_get(&list.fifo, &endpoint)) { 391 /* process this endpoint */ 392 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 393 endpoint); 394 395 /* sun4i_drv_add_endpoints can fail to allocate memory */ 396 if (ret < 0) 397 return ret; 398 399 count += ret; 400 } 401 402 if (count) 403 return component_master_add_with_match(&pdev->dev, 404 &sun4i_drv_master_ops, 405 match); 406 else 407 return 0; 408 } 409 410 static int sun4i_drv_remove(struct platform_device *pdev) 411 { 412 component_master_del(&pdev->dev, &sun4i_drv_master_ops); 413 414 return 0; 415 } 416 417 static const struct of_device_id sun4i_drv_of_table[] = { 418 { .compatible = "allwinner,sun4i-a10-display-engine" }, 419 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 420 { .compatible = "allwinner,sun5i-a13-display-engine" }, 421 { .compatible = "allwinner,sun6i-a31-display-engine" }, 422 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 423 { .compatible = "allwinner,sun7i-a20-display-engine" }, 424 { .compatible = "allwinner,sun8i-a23-display-engine" }, 425 { .compatible = "allwinner,sun8i-a33-display-engine" }, 426 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 427 { .compatible = "allwinner,sun8i-h3-display-engine" }, 428 { .compatible = "allwinner,sun8i-r40-display-engine" }, 429 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 430 { .compatible = "allwinner,sun9i-a80-display-engine" }, 431 { .compatible = "allwinner,sun50i-a64-display-engine" }, 432 { .compatible = "allwinner,sun50i-h6-display-engine" }, 433 { } 434 }; 435 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 436 437 static struct platform_driver sun4i_drv_platform_driver = { 438 .probe = sun4i_drv_probe, 439 .remove = sun4i_drv_remove, 440 .driver = { 441 .name = "sun4i-drm", 442 .of_match_table = sun4i_drv_of_table, 443 .pm = &sun4i_drv_drm_pm_ops, 444 }, 445 }; 446 module_platform_driver(sun4i_drv_platform_driver); 447 448 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 449 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 450 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 451 MODULE_LICENSE("GPL"); 452