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