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_module.h> 23 #include <drm/drm_of.h> 24 #include <drm/drm_probe_helper.h> 25 #include <drm/drm_vblank.h> 26 27 #include "sun4i_drv.h" 28 #include "sun4i_frontend.h" 29 #include "sun4i_framebuffer.h" 30 #include "sun4i_tcon.h" 31 #include "sun8i_tcon_top.h" 32 33 static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv, 34 struct drm_device *drm, 35 struct drm_mode_create_dumb *args) 36 { 37 /* The hardware only allows even pitches for YUV buffers. */ 38 args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2); 39 40 return drm_gem_cma_dumb_create_internal(file_priv, drm, args); 41 } 42 43 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops); 44 45 static const struct drm_driver sun4i_drv_driver = { 46 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 47 48 /* Generic Operations */ 49 .fops = &sun4i_drv_fops, 50 .name = "sun4i-drm", 51 .desc = "Allwinner sun4i Display Engine", 52 .date = "20150629", 53 .major = 1, 54 .minor = 0, 55 56 /* GEM Operations */ 57 DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_sun4i_gem_dumb_create), 58 }; 59 60 static int sun4i_drv_bind(struct device *dev) 61 { 62 struct drm_device *drm; 63 struct sun4i_drv *drv; 64 int ret; 65 66 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 67 if (IS_ERR(drm)) 68 return PTR_ERR(drm); 69 70 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 71 if (!drv) { 72 ret = -ENOMEM; 73 goto free_drm; 74 } 75 76 dev_set_drvdata(dev, drm); 77 drm->dev_private = drv; 78 INIT_LIST_HEAD(&drv->frontend_list); 79 INIT_LIST_HEAD(&drv->engine_list); 80 INIT_LIST_HEAD(&drv->tcon_list); 81 82 ret = of_reserved_mem_device_init(dev); 83 if (ret && ret != -ENODEV) { 84 dev_err(drm->dev, "Couldn't claim our memory region\n"); 85 goto free_drm; 86 } 87 88 drm_mode_config_init(drm); 89 90 ret = component_bind_all(drm->dev, drm); 91 if (ret) { 92 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 93 goto cleanup_mode_config; 94 } 95 96 /* drm_vblank_init calls kcalloc, which can fail */ 97 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 98 if (ret) 99 goto cleanup_mode_config; 100 101 /* Remove early framebuffers (ie. simplefb) */ 102 ret = drm_aperture_remove_framebuffers(false, &sun4i_drv_driver); 103 if (ret) 104 goto cleanup_mode_config; 105 106 sun4i_framebuffer_init(drm); 107 108 /* Enable connectors polling */ 109 drm_kms_helper_poll_init(drm); 110 111 ret = drm_dev_register(drm, 0); 112 if (ret) 113 goto finish_poll; 114 115 drm_fbdev_generic_setup(drm, 32); 116 117 return 0; 118 119 finish_poll: 120 drm_kms_helper_poll_fini(drm); 121 cleanup_mode_config: 122 drm_mode_config_cleanup(drm); 123 of_reserved_mem_device_release(dev); 124 free_drm: 125 drm_dev_put(drm); 126 return ret; 127 } 128 129 static void sun4i_drv_unbind(struct device *dev) 130 { 131 struct drm_device *drm = dev_get_drvdata(dev); 132 133 drm_dev_unregister(drm); 134 drm_kms_helper_poll_fini(drm); 135 drm_atomic_helper_shutdown(drm); 136 drm_mode_config_cleanup(drm); 137 138 component_unbind_all(dev, NULL); 139 of_reserved_mem_device_release(dev); 140 141 drm_dev_put(drm); 142 } 143 144 static const struct component_master_ops sun4i_drv_master_ops = { 145 .bind = sun4i_drv_bind, 146 .unbind = sun4i_drv_unbind, 147 }; 148 149 static bool sun4i_drv_node_is_connector(struct device_node *node) 150 { 151 return of_device_is_compatible(node, "hdmi-connector"); 152 } 153 154 static bool sun4i_drv_node_is_frontend(struct device_node *node) 155 { 156 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 157 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 158 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 159 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 160 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") || 161 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") || 162 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend"); 163 } 164 165 static bool sun4i_drv_node_is_deu(struct device_node *node) 166 { 167 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu"); 168 } 169 170 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node) 171 { 172 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND)) 173 return !!of_match_node(sun4i_frontend_of_table, node); 174 175 return false; 176 } 177 178 static bool sun4i_drv_node_is_tcon(struct device_node *node) 179 { 180 return !!of_match_node(sun4i_tcon_of_table, node); 181 } 182 183 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node) 184 { 185 const struct of_device_id *match; 186 187 match = of_match_node(sun4i_tcon_of_table, node); 188 if (match) { 189 struct sun4i_tcon_quirks *quirks; 190 191 quirks = (struct sun4i_tcon_quirks *)match->data; 192 193 return quirks->has_channel_0; 194 } 195 196 return false; 197 } 198 199 static bool sun4i_drv_node_is_tcon_top(struct device_node *node) 200 { 201 return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && 202 !!of_match_node(sun8i_tcon_top_of_table, node); 203 } 204 205 /* 206 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 207 * crtcs from the device tree using of_graph. For the results to be 208 * correct, encoders must be probed/bound after _all_ crtcs have been 209 * created. The existing code uses a depth first recursive traversal 210 * of the of_graph, which means the encoders downstream of the TCON 211 * get add right after the first TCON. The second TCON or CRTC will 212 * never be properly associated with encoders connected to it. 213 * 214 * Also, in a dual display pipeline setup, both frontends can feed 215 * either backend, and both backends can feed either TCON, we want 216 * all components of the same type to be added before the next type 217 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 218 * i.e. components of the same type are at the same depth when counted 219 * from the frontend. The only exception is the third pipeline in 220 * the A80 SoC, which we do not support anyway. 221 * 222 * Hence we can use a breadth first search traversal order to add 223 * components. We do not need to check for duplicates. The component 224 * matching system handles this for us. 225 */ 226 struct endpoint_list { 227 DECLARE_KFIFO(fifo, struct device_node *, 16); 228 }; 229 230 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, 231 struct device_node *node, 232 int port_id) 233 { 234 struct device_node *ep, *remote, *port; 235 236 port = of_graph_get_port_by_id(node, port_id); 237 if (!port) { 238 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); 239 return; 240 } 241 242 for_each_available_child_of_node(port, ep) { 243 remote = of_graph_get_remote_port_parent(ep); 244 if (!remote) { 245 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 246 continue; 247 } 248 249 if (sun4i_drv_node_is_tcon(node)) { 250 /* 251 * TCON TOP is always probed before TCON. However, TCON 252 * points back to TCON TOP when it is source for HDMI. 253 * We have to skip it here to prevent infinite looping 254 * between TCON TOP and TCON. 255 */ 256 if (sun4i_drv_node_is_tcon_top(remote)) { 257 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); 258 of_node_put(remote); 259 continue; 260 } 261 262 /* 263 * If the node is our TCON with channel 0, the first 264 * port is used for panel or bridges, and will not be 265 * part of the component framework. 266 */ 267 if (sun4i_drv_node_is_tcon_with_ch0(node)) { 268 struct of_endpoint endpoint; 269 270 if (of_graph_parse_endpoint(ep, &endpoint)) { 271 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 272 of_node_put(remote); 273 continue; 274 } 275 276 if (!endpoint.id) { 277 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 278 of_node_put(remote); 279 continue; 280 } 281 } 282 } 283 284 kfifo_put(&list->fifo, remote); 285 } 286 } 287 288 static int sun4i_drv_add_endpoints(struct device *dev, 289 struct endpoint_list *list, 290 struct component_match **match, 291 struct device_node *node) 292 { 293 int count = 0; 294 295 /* 296 * The frontend has been disabled in some of our old device 297 * trees. If we find a node that is the frontend and is 298 * disabled, we should just follow through and parse its 299 * child, but without adding it to the component list. 300 * Otherwise, we obviously want to add it to the list. 301 */ 302 if (!sun4i_drv_node_is_frontend(node) && 303 !of_device_is_available(node)) 304 return 0; 305 306 /* 307 * The connectors will be the last nodes in our pipeline, we 308 * can just bail out. 309 */ 310 if (sun4i_drv_node_is_connector(node)) 311 return 0; 312 313 /* 314 * If the device is either just a regular device, or an 315 * enabled frontend supported by the driver, we add it to our 316 * component list. 317 */ 318 if (!(sun4i_drv_node_is_frontend(node) || 319 sun4i_drv_node_is_deu(node)) || 320 (sun4i_drv_node_is_supported_frontend(node) && 321 of_device_is_available(node))) { 322 /* Add current component */ 323 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 324 drm_of_component_match_add(dev, match, component_compare_of, node); 325 count++; 326 } 327 328 /* each node has at least one output */ 329 sun4i_drv_traverse_endpoints(list, node, 1); 330 331 /* TCON TOP has second and third output */ 332 if (sun4i_drv_node_is_tcon_top(node)) { 333 sun4i_drv_traverse_endpoints(list, node, 3); 334 sun4i_drv_traverse_endpoints(list, node, 5); 335 } 336 337 return count; 338 } 339 340 #ifdef CONFIG_PM_SLEEP 341 static int sun4i_drv_drm_sys_suspend(struct device *dev) 342 { 343 struct drm_device *drm = dev_get_drvdata(dev); 344 345 return drm_mode_config_helper_suspend(drm); 346 } 347 348 static int sun4i_drv_drm_sys_resume(struct device *dev) 349 { 350 struct drm_device *drm = dev_get_drvdata(dev); 351 352 return drm_mode_config_helper_resume(drm); 353 } 354 #endif 355 356 static const struct dev_pm_ops sun4i_drv_drm_pm_ops = { 357 SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend, 358 sun4i_drv_drm_sys_resume) 359 }; 360 361 static int sun4i_drv_probe(struct platform_device *pdev) 362 { 363 struct component_match *match = NULL; 364 struct device_node *np = pdev->dev.of_node, *endpoint; 365 struct endpoint_list list; 366 int i, ret, count = 0; 367 368 INIT_KFIFO(list.fifo); 369 370 for (i = 0;; i++) { 371 struct device_node *pipeline = of_parse_phandle(np, 372 "allwinner,pipelines", 373 i); 374 if (!pipeline) 375 break; 376 377 kfifo_put(&list.fifo, pipeline); 378 } 379 380 while (kfifo_get(&list.fifo, &endpoint)) { 381 /* process this endpoint */ 382 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 383 endpoint); 384 385 /* sun4i_drv_add_endpoints can fail to allocate memory */ 386 if (ret < 0) 387 return ret; 388 389 count += ret; 390 } 391 392 if (count) 393 return component_master_add_with_match(&pdev->dev, 394 &sun4i_drv_master_ops, 395 match); 396 else 397 return 0; 398 } 399 400 static int sun4i_drv_remove(struct platform_device *pdev) 401 { 402 component_master_del(&pdev->dev, &sun4i_drv_master_ops); 403 404 return 0; 405 } 406 407 static const struct of_device_id sun4i_drv_of_table[] = { 408 { .compatible = "allwinner,sun4i-a10-display-engine" }, 409 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 410 { .compatible = "allwinner,sun5i-a13-display-engine" }, 411 { .compatible = "allwinner,sun6i-a31-display-engine" }, 412 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 413 { .compatible = "allwinner,sun7i-a20-display-engine" }, 414 { .compatible = "allwinner,sun8i-a23-display-engine" }, 415 { .compatible = "allwinner,sun8i-a33-display-engine" }, 416 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 417 { .compatible = "allwinner,sun8i-h3-display-engine" }, 418 { .compatible = "allwinner,sun8i-r40-display-engine" }, 419 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 420 { .compatible = "allwinner,sun9i-a80-display-engine" }, 421 { .compatible = "allwinner,sun50i-a64-display-engine" }, 422 { .compatible = "allwinner,sun50i-h6-display-engine" }, 423 { } 424 }; 425 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 426 427 static struct platform_driver sun4i_drv_platform_driver = { 428 .probe = sun4i_drv_probe, 429 .remove = sun4i_drv_remove, 430 .driver = { 431 .name = "sun4i-drm", 432 .of_match_table = sun4i_drv_of_table, 433 .pm = &sun4i_drv_drm_pm_ops, 434 }, 435 }; 436 drm_module_platform_driver(sun4i_drv_platform_driver); 437 438 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 439 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 440 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 441 MODULE_LICENSE("GPL"); 442