1 /* 2 * Copyright (C) 2015 Free Electrons 3 * Copyright (C) 2015 NextThing Co 4 * 5 * Maxime Ripard <maxime.ripard@free-electrons.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as 9 * published by the Free Software Foundation; either version 2 of 10 * the License, or (at your option) any later version. 11 */ 12 13 #include <linux/component.h> 14 #include <linux/kfifo.h> 15 #include <linux/of_graph.h> 16 #include <linux/of_reserved_mem.h> 17 18 #include <drm/drmP.h> 19 #include <drm/drm_crtc_helper.h> 20 #include <drm/drm_fb_cma_helper.h> 21 #include <drm/drm_gem_cma_helper.h> 22 #include <drm/drm_fb_helper.h> 23 #include <drm/drm_of.h> 24 25 #include "sun4i_drv.h" 26 #include "sun4i_framebuffer.h" 27 #include "sun4i_tcon.h" 28 29 static void sun4i_drv_lastclose(struct drm_device *dev) 30 { 31 struct sun4i_drv *drv = dev->dev_private; 32 33 drm_fbdev_cma_restore_mode(drv->fbdev); 34 } 35 36 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops); 37 38 static struct drm_driver sun4i_drv_driver = { 39 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC, 40 41 /* Generic Operations */ 42 .lastclose = sun4i_drv_lastclose, 43 .fops = &sun4i_drv_fops, 44 .name = "sun4i-drm", 45 .desc = "Allwinner sun4i Display Engine", 46 .date = "20150629", 47 .major = 1, 48 .minor = 0, 49 50 /* GEM Operations */ 51 .dumb_create = drm_gem_cma_dumb_create, 52 .gem_free_object_unlocked = drm_gem_cma_free_object, 53 .gem_vm_ops = &drm_gem_cma_vm_ops, 54 55 /* PRIME Operations */ 56 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 57 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 58 .gem_prime_import = drm_gem_prime_import, 59 .gem_prime_export = drm_gem_prime_export, 60 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 61 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 62 .gem_prime_vmap = drm_gem_cma_prime_vmap, 63 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 64 .gem_prime_mmap = drm_gem_cma_prime_mmap, 65 66 /* Frame Buffer Operations */ 67 }; 68 69 static void sun4i_remove_framebuffers(void) 70 { 71 struct apertures_struct *ap; 72 73 ap = alloc_apertures(1); 74 if (!ap) 75 return; 76 77 /* The framebuffer can be located anywhere in RAM */ 78 ap->ranges[0].base = 0; 79 ap->ranges[0].size = ~0; 80 81 drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false); 82 kfree(ap); 83 } 84 85 static int sun4i_drv_bind(struct device *dev) 86 { 87 struct drm_device *drm; 88 struct sun4i_drv *drv; 89 int ret; 90 91 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 92 if (IS_ERR(drm)) 93 return PTR_ERR(drm); 94 95 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 96 if (!drv) { 97 ret = -ENOMEM; 98 goto free_drm; 99 } 100 drm->dev_private = drv; 101 INIT_LIST_HEAD(&drv->engine_list); 102 INIT_LIST_HEAD(&drv->tcon_list); 103 104 ret = of_reserved_mem_device_init(dev); 105 if (ret && ret != -ENODEV) { 106 dev_err(drm->dev, "Couldn't claim our memory region\n"); 107 goto free_drm; 108 } 109 110 drm_mode_config_init(drm); 111 112 ret = component_bind_all(drm->dev, drm); 113 if (ret) { 114 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 115 goto cleanup_mode_config; 116 } 117 118 /* drm_vblank_init calls kcalloc, which can fail */ 119 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 120 if (ret) 121 goto free_mem_region; 122 123 drm->irq_enabled = true; 124 125 /* Remove early framebuffers (ie. simplefb) */ 126 sun4i_remove_framebuffers(); 127 128 /* Create our framebuffer */ 129 drv->fbdev = sun4i_framebuffer_init(drm); 130 if (IS_ERR(drv->fbdev)) { 131 dev_err(drm->dev, "Couldn't create our framebuffer\n"); 132 ret = PTR_ERR(drv->fbdev); 133 goto cleanup_mode_config; 134 } 135 136 /* Enable connectors polling */ 137 drm_kms_helper_poll_init(drm); 138 139 ret = drm_dev_register(drm, 0); 140 if (ret) 141 goto finish_poll; 142 143 return 0; 144 145 finish_poll: 146 drm_kms_helper_poll_fini(drm); 147 sun4i_framebuffer_free(drm); 148 cleanup_mode_config: 149 drm_mode_config_cleanup(drm); 150 free_mem_region: 151 of_reserved_mem_device_release(dev); 152 free_drm: 153 drm_dev_unref(drm); 154 return ret; 155 } 156 157 static void sun4i_drv_unbind(struct device *dev) 158 { 159 struct drm_device *drm = dev_get_drvdata(dev); 160 161 drm_dev_unregister(drm); 162 drm_kms_helper_poll_fini(drm); 163 sun4i_framebuffer_free(drm); 164 drm_mode_config_cleanup(drm); 165 of_reserved_mem_device_release(dev); 166 drm_dev_unref(drm); 167 } 168 169 static const struct component_master_ops sun4i_drv_master_ops = { 170 .bind = sun4i_drv_bind, 171 .unbind = sun4i_drv_unbind, 172 }; 173 174 static bool sun4i_drv_node_is_connector(struct device_node *node) 175 { 176 return of_device_is_compatible(node, "hdmi-connector"); 177 } 178 179 static bool sun4i_drv_node_is_frontend(struct device_node *node) 180 { 181 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 182 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 183 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 184 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 185 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend"); 186 } 187 188 static bool sun4i_drv_node_is_tcon(struct device_node *node) 189 { 190 return of_device_is_compatible(node, "allwinner,sun4i-a10-tcon") || 191 of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") || 192 of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") || 193 of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") || 194 of_device_is_compatible(node, "allwinner,sun7i-a20-tcon") || 195 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon") || 196 of_device_is_compatible(node, "allwinner,sun8i-v3s-tcon"); 197 } 198 199 static int compare_of(struct device *dev, void *data) 200 { 201 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", 202 dev->of_node, 203 data); 204 205 return dev->of_node == data; 206 } 207 208 /* 209 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 210 * crtcs from the device tree using of_graph. For the results to be 211 * correct, encoders must be probed/bound after _all_ crtcs have been 212 * created. The existing code uses a depth first recursive traversal 213 * of the of_graph, which means the encoders downstream of the TCON 214 * get add right after the first TCON. The second TCON or CRTC will 215 * never be properly associated with encoders connected to it. 216 * 217 * Also, in a dual display pipeline setup, both frontends can feed 218 * either backend, and both backends can feed either TCON, we want 219 * all components of the same type to be added before the next type 220 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 221 * i.e. components of the same type are at the same depth when counted 222 * from the frontend. The only exception is the third pipeline in 223 * the A80 SoC, which we do not support anyway. 224 * 225 * Hence we can use a breadth first search traversal order to add 226 * components. We do not need to check for duplicates. The component 227 * matching system handles this for us. 228 */ 229 struct endpoint_list { 230 DECLARE_KFIFO(fifo, struct device_node *, 16); 231 }; 232 233 static int sun4i_drv_add_endpoints(struct device *dev, 234 struct endpoint_list *list, 235 struct component_match **match, 236 struct device_node *node) 237 { 238 struct device_node *port, *ep, *remote; 239 int count = 0; 240 241 /* 242 * We don't support the frontend for now, so we will never 243 * have a device bound. Just skip over it, but we still want 244 * the rest our pipeline to be added. 245 */ 246 if (!sun4i_drv_node_is_frontend(node) && 247 !of_device_is_available(node)) 248 return 0; 249 250 /* 251 * The connectors will be the last nodes in our pipeline, we 252 * can just bail out. 253 */ 254 if (sun4i_drv_node_is_connector(node)) 255 return 0; 256 257 if (!sun4i_drv_node_is_frontend(node)) { 258 /* Add current component */ 259 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 260 drm_of_component_match_add(dev, match, compare_of, node); 261 count++; 262 } 263 264 /* Inputs are listed first, then outputs */ 265 port = of_graph_get_port_by_id(node, 1); 266 if (!port) { 267 DRM_DEBUG_DRIVER("No output to bind\n"); 268 return count; 269 } 270 271 for_each_available_child_of_node(port, ep) { 272 remote = of_graph_get_remote_port_parent(ep); 273 if (!remote) { 274 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 275 of_node_put(remote); 276 continue; 277 } 278 279 /* 280 * If the node is our TCON, the first port is used for 281 * panel or bridges, and will not be part of the 282 * component framework. 283 */ 284 if (sun4i_drv_node_is_tcon(node)) { 285 struct of_endpoint endpoint; 286 287 if (of_graph_parse_endpoint(ep, &endpoint)) { 288 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 289 continue; 290 } 291 292 if (!endpoint.id) { 293 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 294 continue; 295 } 296 } 297 298 kfifo_put(&list->fifo, remote); 299 } 300 301 return count; 302 } 303 304 static int sun4i_drv_probe(struct platform_device *pdev) 305 { 306 struct component_match *match = NULL; 307 struct device_node *np = pdev->dev.of_node, *endpoint; 308 struct endpoint_list list; 309 int i, ret, count = 0; 310 311 INIT_KFIFO(list.fifo); 312 313 for (i = 0;; i++) { 314 struct device_node *pipeline = of_parse_phandle(np, 315 "allwinner,pipelines", 316 i); 317 if (!pipeline) 318 break; 319 320 kfifo_put(&list.fifo, pipeline); 321 } 322 323 while (kfifo_get(&list.fifo, &endpoint)) { 324 /* process this endpoint */ 325 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 326 endpoint); 327 328 /* sun4i_drv_add_endpoints can fail to allocate memory */ 329 if (ret < 0) 330 return ret; 331 332 count += ret; 333 } 334 335 if (count) 336 return component_master_add_with_match(&pdev->dev, 337 &sun4i_drv_master_ops, 338 match); 339 else 340 return 0; 341 } 342 343 static int sun4i_drv_remove(struct platform_device *pdev) 344 { 345 return 0; 346 } 347 348 static const struct of_device_id sun4i_drv_of_table[] = { 349 { .compatible = "allwinner,sun4i-a10-display-engine" }, 350 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 351 { .compatible = "allwinner,sun5i-a13-display-engine" }, 352 { .compatible = "allwinner,sun6i-a31-display-engine" }, 353 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 354 { .compatible = "allwinner,sun7i-a20-display-engine" }, 355 { .compatible = "allwinner,sun8i-a33-display-engine" }, 356 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 357 { } 358 }; 359 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 360 361 static struct platform_driver sun4i_drv_platform_driver = { 362 .probe = sun4i_drv_probe, 363 .remove = sun4i_drv_remove, 364 .driver = { 365 .name = "sun4i-drm", 366 .of_match_table = sun4i_drv_of_table, 367 }, 368 }; 369 module_platform_driver(sun4i_drv_platform_driver); 370 371 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 372 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 373 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 374 MODULE_LICENSE("GPL"); 375