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 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_VMAP_DRIVER_OPS, 56 .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 drm->mode_config.allow_fb_modifiers = true; 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 drm->irq_enabled = true; 102 103 /* Remove early framebuffers (ie. simplefb) */ 104 drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false); 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 static int compare_of(struct device *dev, void *data) 206 { 207 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", 208 dev->of_node, 209 data); 210 211 return dev->of_node == data; 212 } 213 214 /* 215 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 216 * crtcs from the device tree using of_graph. For the results to be 217 * correct, encoders must be probed/bound after _all_ crtcs have been 218 * created. The existing code uses a depth first recursive traversal 219 * of the of_graph, which means the encoders downstream of the TCON 220 * get add right after the first TCON. The second TCON or CRTC will 221 * never be properly associated with encoders connected to it. 222 * 223 * Also, in a dual display pipeline setup, both frontends can feed 224 * either backend, and both backends can feed either TCON, we want 225 * all components of the same type to be added before the next type 226 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 227 * i.e. components of the same type are at the same depth when counted 228 * from the frontend. The only exception is the third pipeline in 229 * the A80 SoC, which we do not support anyway. 230 * 231 * Hence we can use a breadth first search traversal order to add 232 * components. We do not need to check for duplicates. The component 233 * matching system handles this for us. 234 */ 235 struct endpoint_list { 236 DECLARE_KFIFO(fifo, struct device_node *, 16); 237 }; 238 239 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, 240 struct device_node *node, 241 int port_id) 242 { 243 struct device_node *ep, *remote, *port; 244 245 port = of_graph_get_port_by_id(node, port_id); 246 if (!port) { 247 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); 248 return; 249 } 250 251 for_each_available_child_of_node(port, ep) { 252 remote = of_graph_get_remote_port_parent(ep); 253 if (!remote) { 254 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 255 continue; 256 } 257 258 if (sun4i_drv_node_is_tcon(node)) { 259 /* 260 * TCON TOP is always probed before TCON. However, TCON 261 * points back to TCON TOP when it is source for HDMI. 262 * We have to skip it here to prevent infinite looping 263 * between TCON TOP and TCON. 264 */ 265 if (sun4i_drv_node_is_tcon_top(remote)) { 266 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); 267 of_node_put(remote); 268 continue; 269 } 270 271 /* 272 * If the node is our TCON with channel 0, the first 273 * port is used for panel or bridges, and will not be 274 * part of the component framework. 275 */ 276 if (sun4i_drv_node_is_tcon_with_ch0(node)) { 277 struct of_endpoint endpoint; 278 279 if (of_graph_parse_endpoint(ep, &endpoint)) { 280 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 281 of_node_put(remote); 282 continue; 283 } 284 285 if (!endpoint.id) { 286 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 287 of_node_put(remote); 288 continue; 289 } 290 } 291 } 292 293 kfifo_put(&list->fifo, remote); 294 } 295 } 296 297 static int sun4i_drv_add_endpoints(struct device *dev, 298 struct endpoint_list *list, 299 struct component_match **match, 300 struct device_node *node) 301 { 302 int count = 0; 303 304 /* 305 * The frontend has been disabled in some of our old device 306 * trees. If we find a node that is the frontend and is 307 * disabled, we should just follow through and parse its 308 * child, but without adding it to the component list. 309 * Otherwise, we obviously want to add it to the list. 310 */ 311 if (!sun4i_drv_node_is_frontend(node) && 312 !of_device_is_available(node)) 313 return 0; 314 315 /* 316 * The connectors will be the last nodes in our pipeline, we 317 * can just bail out. 318 */ 319 if (sun4i_drv_node_is_connector(node)) 320 return 0; 321 322 /* 323 * If the device is either just a regular device, or an 324 * enabled frontend supported by the driver, we add it to our 325 * component list. 326 */ 327 if (!(sun4i_drv_node_is_frontend(node) || 328 sun4i_drv_node_is_deu(node)) || 329 (sun4i_drv_node_is_supported_frontend(node) && 330 of_device_is_available(node))) { 331 /* Add current component */ 332 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 333 drm_of_component_match_add(dev, match, compare_of, node); 334 count++; 335 } 336 337 /* each node has at least one output */ 338 sun4i_drv_traverse_endpoints(list, node, 1); 339 340 /* TCON TOP has second and third output */ 341 if (sun4i_drv_node_is_tcon_top(node)) { 342 sun4i_drv_traverse_endpoints(list, node, 3); 343 sun4i_drv_traverse_endpoints(list, node, 5); 344 } 345 346 return count; 347 } 348 349 static int sun4i_drv_probe(struct platform_device *pdev) 350 { 351 struct component_match *match = NULL; 352 struct device_node *np = pdev->dev.of_node, *endpoint; 353 struct endpoint_list list; 354 int i, ret, count = 0; 355 356 INIT_KFIFO(list.fifo); 357 358 for (i = 0;; i++) { 359 struct device_node *pipeline = of_parse_phandle(np, 360 "allwinner,pipelines", 361 i); 362 if (!pipeline) 363 break; 364 365 kfifo_put(&list.fifo, pipeline); 366 } 367 368 while (kfifo_get(&list.fifo, &endpoint)) { 369 /* process this endpoint */ 370 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 371 endpoint); 372 373 /* sun4i_drv_add_endpoints can fail to allocate memory */ 374 if (ret < 0) 375 return ret; 376 377 count += ret; 378 } 379 380 if (count) 381 return component_master_add_with_match(&pdev->dev, 382 &sun4i_drv_master_ops, 383 match); 384 else 385 return 0; 386 } 387 388 static int sun4i_drv_remove(struct platform_device *pdev) 389 { 390 component_master_del(&pdev->dev, &sun4i_drv_master_ops); 391 392 return 0; 393 } 394 395 static const struct of_device_id sun4i_drv_of_table[] = { 396 { .compatible = "allwinner,sun4i-a10-display-engine" }, 397 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 398 { .compatible = "allwinner,sun5i-a13-display-engine" }, 399 { .compatible = "allwinner,sun6i-a31-display-engine" }, 400 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 401 { .compatible = "allwinner,sun7i-a20-display-engine" }, 402 { .compatible = "allwinner,sun8i-a23-display-engine" }, 403 { .compatible = "allwinner,sun8i-a33-display-engine" }, 404 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 405 { .compatible = "allwinner,sun8i-h3-display-engine" }, 406 { .compatible = "allwinner,sun8i-r40-display-engine" }, 407 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 408 { .compatible = "allwinner,sun9i-a80-display-engine" }, 409 { .compatible = "allwinner,sun50i-a64-display-engine" }, 410 { .compatible = "allwinner,sun50i-h6-display-engine" }, 411 { } 412 }; 413 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 414 415 static struct platform_driver sun4i_drv_platform_driver = { 416 .probe = sun4i_drv_probe, 417 .remove = sun4i_drv_remove, 418 .driver = { 419 .name = "sun4i-drm", 420 .of_match_table = sun4i_drv_of_table, 421 }, 422 }; 423 module_platform_driver(sun4i_drv_platform_driver); 424 425 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 426 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 427 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 428 MODULE_LICENSE("GPL"); 429