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/dma-mapping.h> 11 #include <linux/kfifo.h> 12 #include <linux/module.h> 13 #include <linux/of_graph.h> 14 #include <linux/of_reserved_mem.h> 15 #include <linux/platform_device.h> 16 17 #include <drm/drm_aperture.h> 18 #include <drm/drm_atomic_helper.h> 19 #include <drm/drm_drv.h> 20 #include <drm/drm_fbdev_dma.h> 21 #include <drm/drm_gem_dma_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_dma_dumb_create_internal(file_priv, drm, args); 41 } 42 43 DEFINE_DRM_GEM_DMA_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_DMA_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 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 unbind_all; 99 100 /* Remove early framebuffers (ie. simplefb) */ 101 ret = drm_aperture_remove_framebuffers(&sun4i_drv_driver); 102 if (ret) 103 goto unbind_all; 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_dma_setup(drm, 32); 115 116 dev_set_drvdata(dev, drm); 117 118 return 0; 119 120 finish_poll: 121 drm_kms_helper_poll_fini(drm); 122 unbind_all: 123 component_unbind_all(dev, NULL); 124 cleanup_mode_config: 125 drm_mode_config_cleanup(drm); 126 of_reserved_mem_device_release(dev); 127 free_drm: 128 drm_dev_put(drm); 129 return ret; 130 } 131 132 static void sun4i_drv_unbind(struct device *dev) 133 { 134 struct drm_device *drm = dev_get_drvdata(dev); 135 136 dev_set_drvdata(dev, NULL); 137 drm_dev_unregister(drm); 138 drm_kms_helper_poll_fini(drm); 139 drm_atomic_helper_shutdown(drm); 140 drm_mode_config_cleanup(drm); 141 142 component_unbind_all(dev, NULL); 143 of_reserved_mem_device_release(dev); 144 145 drm_dev_put(drm); 146 } 147 148 static const struct component_master_ops sun4i_drv_master_ops = { 149 .bind = sun4i_drv_bind, 150 .unbind = sun4i_drv_unbind, 151 }; 152 153 static bool sun4i_drv_node_is_connector(struct device_node *node) 154 { 155 return of_device_is_compatible(node, "hdmi-connector"); 156 } 157 158 static bool sun4i_drv_node_is_frontend(struct device_node *node) 159 { 160 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 161 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 162 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 163 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 164 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") || 165 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") || 166 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend"); 167 } 168 169 static bool sun4i_drv_node_is_deu(struct device_node *node) 170 { 171 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu"); 172 } 173 174 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node) 175 { 176 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND)) 177 return !!of_match_node(sun4i_frontend_of_table, node); 178 179 return false; 180 } 181 182 static bool sun4i_drv_node_is_tcon(struct device_node *node) 183 { 184 return !!of_match_node(sun4i_tcon_of_table, node); 185 } 186 187 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node) 188 { 189 const struct of_device_id *match; 190 191 match = of_match_node(sun4i_tcon_of_table, node); 192 if (match) { 193 struct sun4i_tcon_quirks *quirks; 194 195 quirks = (struct sun4i_tcon_quirks *)match->data; 196 197 return quirks->has_channel_0; 198 } 199 200 return false; 201 } 202 203 static bool sun4i_drv_node_is_tcon_top(struct device_node *node) 204 { 205 return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && 206 !!of_match_node(sun8i_tcon_top_of_table, node); 207 } 208 209 /* 210 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 211 * crtcs from the device tree using of_graph. For the results to be 212 * correct, encoders must be probed/bound after _all_ crtcs have been 213 * created. The existing code uses a depth first recursive traversal 214 * of the of_graph, which means the encoders downstream of the TCON 215 * get add right after the first TCON. The second TCON or CRTC will 216 * never be properly associated with encoders connected to it. 217 * 218 * Also, in a dual display pipeline setup, both frontends can feed 219 * either backend, and both backends can feed either TCON, we want 220 * all components of the same type to be added before the next type 221 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 222 * i.e. components of the same type are at the same depth when counted 223 * from the frontend. The only exception is the third pipeline in 224 * the A80 SoC, which we do not support anyway. 225 * 226 * Hence we can use a breadth first search traversal order to add 227 * components. We do not need to check for duplicates. The component 228 * matching system handles this for us. 229 */ 230 struct endpoint_list { 231 DECLARE_KFIFO(fifo, struct device_node *, 16); 232 }; 233 234 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, 235 struct device_node *node, 236 int port_id) 237 { 238 struct device_node *ep, *remote, *port; 239 240 port = of_graph_get_port_by_id(node, port_id); 241 if (!port) { 242 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); 243 return; 244 } 245 246 for_each_available_child_of_node(port, ep) { 247 remote = of_graph_get_remote_port_parent(ep); 248 if (!remote) { 249 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 250 continue; 251 } 252 253 if (sun4i_drv_node_is_tcon(node)) { 254 /* 255 * TCON TOP is always probed before TCON. However, TCON 256 * points back to TCON TOP when it is source for HDMI. 257 * We have to skip it here to prevent infinite looping 258 * between TCON TOP and TCON. 259 */ 260 if (sun4i_drv_node_is_tcon_top(remote)) { 261 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); 262 of_node_put(remote); 263 continue; 264 } 265 266 /* 267 * If the node is our TCON with channel 0, the first 268 * port is used for panel or bridges, and will not be 269 * part of the component framework. 270 */ 271 if (sun4i_drv_node_is_tcon_with_ch0(node)) { 272 struct of_endpoint endpoint; 273 274 if (of_graph_parse_endpoint(ep, &endpoint)) { 275 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 276 of_node_put(remote); 277 continue; 278 } 279 280 if (!endpoint.id) { 281 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 282 of_node_put(remote); 283 continue; 284 } 285 } 286 } 287 288 kfifo_put(&list->fifo, remote); 289 } 290 } 291 292 static int sun4i_drv_add_endpoints(struct device *dev, 293 struct endpoint_list *list, 294 struct component_match **match, 295 struct device_node *node) 296 { 297 int count = 0; 298 299 /* 300 * The frontend has been disabled in some of our old device 301 * trees. If we find a node that is the frontend and is 302 * disabled, we should just follow through and parse its 303 * child, but without adding it to the component list. 304 * Otherwise, we obviously want to add it to the list. 305 */ 306 if (!sun4i_drv_node_is_frontend(node) && 307 !of_device_is_available(node)) 308 return 0; 309 310 /* 311 * The connectors will be the last nodes in our pipeline, we 312 * can just bail out. 313 */ 314 if (sun4i_drv_node_is_connector(node)) 315 return 0; 316 317 /* 318 * If the device is either just a regular device, or an 319 * enabled frontend supported by the driver, we add it to our 320 * component list. 321 */ 322 if (!(sun4i_drv_node_is_frontend(node) || 323 sun4i_drv_node_is_deu(node)) || 324 (sun4i_drv_node_is_supported_frontend(node) && 325 of_device_is_available(node))) { 326 /* Add current component */ 327 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 328 drm_of_component_match_add(dev, match, component_compare_of, node); 329 count++; 330 } 331 332 /* each node has at least one output */ 333 sun4i_drv_traverse_endpoints(list, node, 1); 334 335 /* TCON TOP has second and third output */ 336 if (sun4i_drv_node_is_tcon_top(node)) { 337 sun4i_drv_traverse_endpoints(list, node, 3); 338 sun4i_drv_traverse_endpoints(list, node, 5); 339 } 340 341 return count; 342 } 343 344 #ifdef CONFIG_PM_SLEEP 345 static int sun4i_drv_drm_sys_suspend(struct device *dev) 346 { 347 struct drm_device *drm = dev_get_drvdata(dev); 348 349 return drm_mode_config_helper_suspend(drm); 350 } 351 352 static int sun4i_drv_drm_sys_resume(struct device *dev) 353 { 354 struct drm_device *drm = dev_get_drvdata(dev); 355 356 return drm_mode_config_helper_resume(drm); 357 } 358 #endif 359 360 static const struct dev_pm_ops sun4i_drv_drm_pm_ops = { 361 SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend, 362 sun4i_drv_drm_sys_resume) 363 }; 364 365 static int sun4i_drv_probe(struct platform_device *pdev) 366 { 367 struct component_match *match = NULL; 368 struct device_node *np = pdev->dev.of_node, *endpoint; 369 struct endpoint_list list; 370 int i, ret, count = 0; 371 372 INIT_KFIFO(list.fifo); 373 374 /* 375 * DE2 and DE3 cores actually supports 40-bit addresses, but 376 * driver does not. 377 */ 378 dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 379 dma_set_max_seg_size(&pdev->dev, UINT_MAX); 380 381 for (i = 0;; i++) { 382 struct device_node *pipeline = of_parse_phandle(np, 383 "allwinner,pipelines", 384 i); 385 if (!pipeline) 386 break; 387 388 kfifo_put(&list.fifo, pipeline); 389 } 390 391 while (kfifo_get(&list.fifo, &endpoint)) { 392 /* process this endpoint */ 393 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 394 endpoint); 395 396 /* sun4i_drv_add_endpoints can fail to allocate memory */ 397 if (ret < 0) 398 return ret; 399 400 count += ret; 401 } 402 403 if (count) 404 return component_master_add_with_match(&pdev->dev, 405 &sun4i_drv_master_ops, 406 match); 407 else 408 return 0; 409 } 410 411 static int sun4i_drv_remove(struct platform_device *pdev) 412 { 413 component_master_del(&pdev->dev, &sun4i_drv_master_ops); 414 415 return 0; 416 } 417 418 static const struct of_device_id sun4i_drv_of_table[] = { 419 { .compatible = "allwinner,sun4i-a10-display-engine" }, 420 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 421 { .compatible = "allwinner,sun5i-a13-display-engine" }, 422 { .compatible = "allwinner,sun6i-a31-display-engine" }, 423 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 424 { .compatible = "allwinner,sun7i-a20-display-engine" }, 425 { .compatible = "allwinner,sun8i-a23-display-engine" }, 426 { .compatible = "allwinner,sun8i-a33-display-engine" }, 427 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 428 { .compatible = "allwinner,sun8i-h3-display-engine" }, 429 { .compatible = "allwinner,sun8i-r40-display-engine" }, 430 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 431 { .compatible = "allwinner,sun9i-a80-display-engine" }, 432 { .compatible = "allwinner,sun20i-d1-display-engine" }, 433 { .compatible = "allwinner,sun50i-a64-display-engine" }, 434 { .compatible = "allwinner,sun50i-h6-display-engine" }, 435 { } 436 }; 437 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 438 439 static struct platform_driver sun4i_drv_platform_driver = { 440 .probe = sun4i_drv_probe, 441 .remove = sun4i_drv_remove, 442 .driver = { 443 .name = "sun4i-drm", 444 .of_match_table = sun4i_drv_of_table, 445 .pm = &sun4i_drv_drm_pm_ops, 446 }, 447 }; 448 drm_module_platform_driver(sun4i_drv_platform_driver); 449 450 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 451 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 452 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 453 MODULE_LICENSE("GPL"); 454