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 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops); 30 31 static struct drm_driver sun4i_drv_driver = { 32 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC, 33 34 /* Generic Operations */ 35 .lastclose = drm_fb_helper_lastclose, 36 .fops = &sun4i_drv_fops, 37 .name = "sun4i-drm", 38 .desc = "Allwinner sun4i Display Engine", 39 .date = "20150629", 40 .major = 1, 41 .minor = 0, 42 43 /* GEM Operations */ 44 .dumb_create = drm_gem_cma_dumb_create, 45 .gem_free_object_unlocked = drm_gem_cma_free_object, 46 .gem_vm_ops = &drm_gem_cma_vm_ops, 47 48 /* PRIME Operations */ 49 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 50 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 51 .gem_prime_import = drm_gem_prime_import, 52 .gem_prime_export = drm_gem_prime_export, 53 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 54 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 55 .gem_prime_vmap = drm_gem_cma_prime_vmap, 56 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 57 .gem_prime_mmap = drm_gem_cma_prime_mmap, 58 59 /* Frame Buffer Operations */ 60 }; 61 62 static void sun4i_remove_framebuffers(void) 63 { 64 struct apertures_struct *ap; 65 66 ap = alloc_apertures(1); 67 if (!ap) 68 return; 69 70 /* The framebuffer can be located anywhere in RAM */ 71 ap->ranges[0].base = 0; 72 ap->ranges[0].size = ~0; 73 74 drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false); 75 kfree(ap); 76 } 77 78 static int sun4i_drv_bind(struct device *dev) 79 { 80 struct drm_device *drm; 81 struct sun4i_drv *drv; 82 int ret; 83 84 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 85 if (IS_ERR(drm)) 86 return PTR_ERR(drm); 87 88 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 89 if (!drv) { 90 ret = -ENOMEM; 91 goto free_drm; 92 } 93 drm->dev_private = drv; 94 INIT_LIST_HEAD(&drv->engine_list); 95 INIT_LIST_HEAD(&drv->tcon_list); 96 97 ret = of_reserved_mem_device_init(dev); 98 if (ret && ret != -ENODEV) { 99 dev_err(drm->dev, "Couldn't claim our memory region\n"); 100 goto free_drm; 101 } 102 103 drm_mode_config_init(drm); 104 105 ret = component_bind_all(drm->dev, drm); 106 if (ret) { 107 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 108 goto cleanup_mode_config; 109 } 110 111 /* drm_vblank_init calls kcalloc, which can fail */ 112 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 113 if (ret) 114 goto free_mem_region; 115 116 drm->irq_enabled = true; 117 118 /* Remove early framebuffers (ie. simplefb) */ 119 sun4i_remove_framebuffers(); 120 121 /* Create our framebuffer */ 122 ret = sun4i_framebuffer_init(drm); 123 if (ret) { 124 dev_err(drm->dev, "Couldn't create our framebuffer\n"); 125 goto cleanup_mode_config; 126 } 127 128 /* Enable connectors polling */ 129 drm_kms_helper_poll_init(drm); 130 131 ret = drm_dev_register(drm, 0); 132 if (ret) 133 goto finish_poll; 134 135 return 0; 136 137 finish_poll: 138 drm_kms_helper_poll_fini(drm); 139 sun4i_framebuffer_free(drm); 140 cleanup_mode_config: 141 drm_mode_config_cleanup(drm); 142 free_mem_region: 143 of_reserved_mem_device_release(dev); 144 free_drm: 145 drm_dev_unref(drm); 146 return ret; 147 } 148 149 static void sun4i_drv_unbind(struct device *dev) 150 { 151 struct drm_device *drm = dev_get_drvdata(dev); 152 153 drm_dev_unregister(drm); 154 drm_kms_helper_poll_fini(drm); 155 sun4i_framebuffer_free(drm); 156 drm_mode_config_cleanup(drm); 157 of_reserved_mem_device_release(dev); 158 drm_dev_unref(drm); 159 } 160 161 static const struct component_master_ops sun4i_drv_master_ops = { 162 .bind = sun4i_drv_bind, 163 .unbind = sun4i_drv_unbind, 164 }; 165 166 static bool sun4i_drv_node_is_connector(struct device_node *node) 167 { 168 return of_device_is_compatible(node, "hdmi-connector"); 169 } 170 171 static bool sun4i_drv_node_is_frontend(struct device_node *node) 172 { 173 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || 174 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 175 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 176 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || 177 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend"); 178 } 179 180 static bool sun4i_drv_node_is_tcon(struct device_node *node) 181 { 182 return !!of_match_node(sun4i_tcon_of_table, node); 183 } 184 185 static int compare_of(struct device *dev, void *data) 186 { 187 DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", 188 dev->of_node, 189 data); 190 191 return dev->of_node == data; 192 } 193 194 /* 195 * The encoder drivers use drm_of_find_possible_crtcs to get upstream 196 * crtcs from the device tree using of_graph. For the results to be 197 * correct, encoders must be probed/bound after _all_ crtcs have been 198 * created. The existing code uses a depth first recursive traversal 199 * of the of_graph, which means the encoders downstream of the TCON 200 * get add right after the first TCON. The second TCON or CRTC will 201 * never be properly associated with encoders connected to it. 202 * 203 * Also, in a dual display pipeline setup, both frontends can feed 204 * either backend, and both backends can feed either TCON, we want 205 * all components of the same type to be added before the next type 206 * in the pipeline. Fortunately, the pipelines are perfectly symmetric, 207 * i.e. components of the same type are at the same depth when counted 208 * from the frontend. The only exception is the third pipeline in 209 * the A80 SoC, which we do not support anyway. 210 * 211 * Hence we can use a breadth first search traversal order to add 212 * components. We do not need to check for duplicates. The component 213 * matching system handles this for us. 214 */ 215 struct endpoint_list { 216 DECLARE_KFIFO(fifo, struct device_node *, 16); 217 }; 218 219 static int sun4i_drv_add_endpoints(struct device *dev, 220 struct endpoint_list *list, 221 struct component_match **match, 222 struct device_node *node) 223 { 224 struct device_node *port, *ep, *remote; 225 int count = 0; 226 227 /* 228 * We don't support the frontend for now, so we will never 229 * have a device bound. Just skip over it, but we still want 230 * the rest our pipeline to be added. 231 */ 232 if (!sun4i_drv_node_is_frontend(node) && 233 !of_device_is_available(node)) 234 return 0; 235 236 /* 237 * The connectors will be the last nodes in our pipeline, we 238 * can just bail out. 239 */ 240 if (sun4i_drv_node_is_connector(node)) 241 return 0; 242 243 if (!sun4i_drv_node_is_frontend(node)) { 244 /* Add current component */ 245 DRM_DEBUG_DRIVER("Adding component %pOF\n", node); 246 drm_of_component_match_add(dev, match, compare_of, node); 247 count++; 248 } 249 250 /* Inputs are listed first, then outputs */ 251 port = of_graph_get_port_by_id(node, 1); 252 if (!port) { 253 DRM_DEBUG_DRIVER("No output to bind\n"); 254 return count; 255 } 256 257 for_each_available_child_of_node(port, ep) { 258 remote = of_graph_get_remote_port_parent(ep); 259 if (!remote) { 260 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 261 of_node_put(remote); 262 continue; 263 } 264 265 /* 266 * If the node is our TCON, the first port is used for 267 * panel or bridges, and will not be part of the 268 * component framework. 269 */ 270 if (sun4i_drv_node_is_tcon(node)) { 271 struct of_endpoint endpoint; 272 273 if (of_graph_parse_endpoint(ep, &endpoint)) { 274 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 275 continue; 276 } 277 278 if (!endpoint.id) { 279 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 280 continue; 281 } 282 } 283 284 kfifo_put(&list->fifo, remote); 285 } 286 287 return count; 288 } 289 290 static int sun4i_drv_probe(struct platform_device *pdev) 291 { 292 struct component_match *match = NULL; 293 struct device_node *np = pdev->dev.of_node, *endpoint; 294 struct endpoint_list list; 295 int i, ret, count = 0; 296 297 INIT_KFIFO(list.fifo); 298 299 for (i = 0;; i++) { 300 struct device_node *pipeline = of_parse_phandle(np, 301 "allwinner,pipelines", 302 i); 303 if (!pipeline) 304 break; 305 306 kfifo_put(&list.fifo, pipeline); 307 } 308 309 while (kfifo_get(&list.fifo, &endpoint)) { 310 /* process this endpoint */ 311 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, 312 endpoint); 313 314 /* sun4i_drv_add_endpoints can fail to allocate memory */ 315 if (ret < 0) 316 return ret; 317 318 count += ret; 319 } 320 321 if (count) 322 return component_master_add_with_match(&pdev->dev, 323 &sun4i_drv_master_ops, 324 match); 325 else 326 return 0; 327 } 328 329 static int sun4i_drv_remove(struct platform_device *pdev) 330 { 331 return 0; 332 } 333 334 static const struct of_device_id sun4i_drv_of_table[] = { 335 { .compatible = "allwinner,sun4i-a10-display-engine" }, 336 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 337 { .compatible = "allwinner,sun5i-a13-display-engine" }, 338 { .compatible = "allwinner,sun6i-a31-display-engine" }, 339 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 340 { .compatible = "allwinner,sun7i-a20-display-engine" }, 341 { .compatible = "allwinner,sun8i-a33-display-engine" }, 342 { .compatible = "allwinner,sun8i-a83t-display-engine" }, 343 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 344 { } 345 }; 346 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 347 348 static struct platform_driver sun4i_drv_platform_driver = { 349 .probe = sun4i_drv_probe, 350 .remove = sun4i_drv_remove, 351 .driver = { 352 .name = "sun4i-drm", 353 .of_match_table = sun4i_drv_of_table, 354 }, 355 }; 356 module_platform_driver(sun4i_drv_platform_driver); 357 358 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 359 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 360 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 361 MODULE_LICENSE("GPL"); 362