drivers/gpu/drm/sun4i/sun4i_drv.c

   1 /*
   2  * Copyright (C) 2015 Free Electrons
   3  * Copyright (C) 2015 NextThing Co
   4  *
   5  * Maxime Ripard <[email protected]>
   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_frontend.h"
  27 #include "sun4i_framebuffer.h"
  28 #include "sun4i_tcon.h"
  29 #include "sun8i_tcon_top.h"
  30
  31 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
  32
  33 static struct drm_driver sun4i_drv_driver = {
  34         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
  35
  36         /* Generic Operations */
  37         .lastclose              = drm_fb_helper_lastclose,
  38         .fops                   = &sun4i_drv_fops,
  39         .name                   = "sun4i-drm",
  40         .desc                   = "Allwinner sun4i Display Engine",
  41         .date                   = "20150629",
  42         .major                  = 1,
  43         .minor                  = 0,
  44
  45         /* GEM Operations */
  46         .dumb_create            = drm_gem_cma_dumb_create,
  47         .gem_free_object_unlocked = drm_gem_cma_free_object,
  48         .gem_vm_ops             = &drm_gem_cma_vm_ops,
  49
  50         /* PRIME Operations */
  51         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  52         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  53         .gem_prime_import       = drm_gem_prime_import,
  54         .gem_prime_export       = drm_gem_prime_export,
  55         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  56         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  57         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
  58         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
  59         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
  60
  61         /* Frame Buffer Operations */
  62 };
  63
  64 static int sun4i_drv_bind(struct device *dev)
  65 {
  66         struct drm_device *drm;
  67         struct sun4i_drv *drv;
  68         int ret;
  69
  70         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
  71         if (IS_ERR(drm))
  72                 return PTR_ERR(drm);
  73
  74         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
  75         if (!drv) {
  76                 ret = -ENOMEM;
  77                 goto free_drm;
  78         }
  79         drm->dev_private = drv;
  80         INIT_LIST_HEAD(&drv->frontend_list);
  81         INIT_LIST_HEAD(&drv->engine_list);
  82         INIT_LIST_HEAD(&drv->tcon_list);
  83
  84         ret = of_reserved_mem_device_init(dev);
  85         if (ret && ret != -ENODEV) {
  86                 dev_err(drm->dev, "Couldn't claim our memory region\n");
  87                 goto free_drm;
  88         }
  89
  90         drm_mode_config_init(drm);
  91
  92         ret = component_bind_all(drm->dev, drm);
  93         if (ret) {
  94                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
  95                 goto cleanup_mode_config;
  96         }
  97
  98         /* drm_vblank_init calls kcalloc, which can fail */
  99         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 100         if (ret)
 101                 goto cleanup_mode_config;
 102
 103         drm->irq_enabled = true;
 104
 105         /* Remove early framebuffers (ie. simplefb) */
 106         drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
 107
 108         /* Create our framebuffer */
 109         ret = sun4i_framebuffer_init(drm);
 110         if (ret) {
 111                 dev_err(drm->dev, "Couldn't create our framebuffer\n");
 112                 goto cleanup_mode_config;
 113         }
 114
 115         /* Enable connectors polling */
 116         drm_kms_helper_poll_init(drm);
 117
 118         ret = drm_dev_register(drm, 0);
 119         if (ret)
 120                 goto finish_poll;
 121
 122         return 0;
 123
 124 finish_poll:
 125         drm_kms_helper_poll_fini(drm);
 126         sun4i_framebuffer_free(drm);
 127 cleanup_mode_config:
 128         drm_mode_config_cleanup(drm);
 129         of_reserved_mem_device_release(dev);
 130 free_drm:
 131         drm_dev_put(drm);
 132         return ret;
 133 }
 134
 135 static void sun4i_drv_unbind(struct device *dev)
 136 {
 137         struct drm_device *drm = dev_get_drvdata(dev);
 138
 139         drm_dev_unregister(drm);
 140         drm_kms_helper_poll_fini(drm);
 141         sun4i_framebuffer_free(drm);
 142         drm_mode_config_cleanup(drm);
 143         of_reserved_mem_device_release(dev);
 144         drm_dev_put(drm);
 145 }
 146
 147 static const struct component_master_ops sun4i_drv_master_ops = {
 148         .bind   = sun4i_drv_bind,
 149         .unbind = sun4i_drv_unbind,
 150 };
 151
 152 static bool sun4i_drv_node_is_connector(struct device_node *node)
 153 {
 154         return of_device_is_compatible(node, "hdmi-connector");
 155 }
 156
 157 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 158 {
 159         return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
 160                 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 161                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 162                 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
 163                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
 164                 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
 165 }
 166
 167 static bool sun4i_drv_node_is_deu(struct device_node *node)
 168 {
 169         return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
 170 }
 171
 172 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
 173 {
 174         if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
 175                 return !!of_match_node(sun4i_frontend_of_table, node);
 176
 177         return false;
 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 bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
 186 {
 187         const struct of_device_id *match;
 188
 189         match = of_match_node(sun4i_tcon_of_table, node);
 190         if (match) {
 191                 struct sun4i_tcon_quirks *quirks;
 192
 193                 quirks = (struct sun4i_tcon_quirks *)match->data;
 194
 195                 return quirks->has_channel_0;
 196         }
 197
 198         return false;
 199 }
 200
 201 static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
 202 {
 203         return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
 204                 !!of_match_node(sun8i_tcon_top_of_table, node);
 205 }
 206
 207 static int compare_of(struct device *dev, void *data)
 208 {
 209         DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
 210                          dev->of_node,
 211                          data);
 212
 213         return dev->of_node == data;
 214 }
 215
 216 /*
 217  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 218  * crtcs from the device tree using of_graph. For the results to be
 219  * correct, encoders must be probed/bound after _all_ crtcs have been
 220  * created. The existing code uses a depth first recursive traversal
 221  * of the of_graph, which means the encoders downstream of the TCON
 222  * get add right after the first TCON. The second TCON or CRTC will
 223  * never be properly associated with encoders connected to it.
 224  *
 225  * Also, in a dual display pipeline setup, both frontends can feed
 226  * either backend, and both backends can feed either TCON, we want
 227  * all components of the same type to be added before the next type
 228  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 229  * i.e. components of the same type are at the same depth when counted
 230  * from the frontend. The only exception is the third pipeline in
 231  * the A80 SoC, which we do not support anyway.
 232  *
 233  * Hence we can use a breadth first search traversal order to add
 234  * components. We do not need to check for duplicates. The component
 235  * matching system handles this for us.
 236  */
 237 struct endpoint_list {
 238         DECLARE_KFIFO(fifo, struct device_node *, 16);
 239 };
 240
 241 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
 242                                          struct device_node *node,
 243                                          int port_id)
 244 {
 245         struct device_node *ep, *remote, *port;
 246
 247         port = of_graph_get_port_by_id(node, port_id);
 248         if (!port) {
 249                 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
 250                 return;
 251         }
 252
 253         for_each_available_child_of_node(port, ep) {
 254                 remote = of_graph_get_remote_port_parent(ep);
 255                 if (!remote) {
 256                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 257                         continue;
 258                 }
 259
 260                 if (sun4i_drv_node_is_tcon(node)) {
 261                         /*
 262                          * TCON TOP is always probed before TCON. However, TCON
 263                          * points back to TCON TOP when it is source for HDMI.
 264                          * We have to skip it here to prevent infinite looping
 265                          * between TCON TOP and TCON.
 266                          */
 267                         if (sun4i_drv_node_is_tcon_top(remote)) {
 268                                 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
 269                                 of_node_put(remote);
 270                                 continue;
 271                         }
 272
 273                         /*
 274                          * If the node is our TCON with channel 0, the first
 275                          * port is used for panel or bridges, and will not be
 276                          * part of the component framework.
 277                          */
 278                         if (sun4i_drv_node_is_tcon_with_ch0(node)) {
 279                                 struct of_endpoint endpoint;
 280
 281                                 if (of_graph_parse_endpoint(ep, &endpoint)) {
 282                                         DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 283                                         of_node_put(remote);
 284                                         continue;
 285                                 }
 286
 287                                 if (!endpoint.id) {
 288                                         DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 289                                         of_node_put(remote);
 290                                         continue;
 291                                 }
 292                         }
 293                 }
 294
 295                 kfifo_put(&list->fifo, remote);
 296         }
 297 }
 298
 299 static int sun4i_drv_add_endpoints(struct device *dev,
 300                                    struct endpoint_list *list,
 301                                    struct component_match **match,
 302                                    struct device_node *node)
 303 {
 304         int count = 0;
 305
 306         /*
 307          * The frontend has been disabled in some of our old device
 308          * trees. If we find a node that is the frontend and is
 309          * disabled, we should just follow through and parse its
 310          * child, but without adding it to the component list.
 311          * Otherwise, we obviously want to add it to the list.
 312          */
 313         if (!sun4i_drv_node_is_frontend(node) &&
 314             !of_device_is_available(node))
 315                 return 0;
 316
 317         /*
 318          * The connectors will be the last nodes in our pipeline, we
 319          * can just bail out.
 320          */
 321         if (sun4i_drv_node_is_connector(node))
 322                 return 0;
 323
 324         /*
 325          * If the device is either just a regular device, or an
 326          * enabled frontend supported by the driver, we add it to our
 327          * component list.
 328          */
 329         if (!(sun4i_drv_node_is_frontend(node) ||
 330               sun4i_drv_node_is_deu(node)) ||
 331             (sun4i_drv_node_is_supported_frontend(node) &&
 332              of_device_is_available(node))) {
 333                 /* Add current component */
 334                 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
 335                 drm_of_component_match_add(dev, match, compare_of, node);
 336                 count++;
 337         }
 338
 339         /* each node has at least one output */
 340         sun4i_drv_traverse_endpoints(list, node, 1);
 341
 342         /* TCON TOP has second and third output */
 343         if (sun4i_drv_node_is_tcon_top(node)) {
 344                 sun4i_drv_traverse_endpoints(list, node, 3);
 345                 sun4i_drv_traverse_endpoints(list, node, 5);
 346         }
 347
 348         return count;
 349 }
 350
 351 static int sun4i_drv_probe(struct platform_device *pdev)
 352 {
 353         struct component_match *match = NULL;
 354         struct device_node *np = pdev->dev.of_node, *endpoint;
 355         struct endpoint_list list;
 356         int i, ret, count = 0;
 357
 358         INIT_KFIFO(list.fifo);
 359
 360         for (i = 0;; i++) {
 361                 struct device_node *pipeline = of_parse_phandle(np,
 362                                                                 "allwinner,pipelines",
 363                                                                 i);
 364                 if (!pipeline)
 365                         break;
 366
 367                 kfifo_put(&list.fifo, pipeline);
 368         }
 369
 370         while (kfifo_get(&list.fifo, &endpoint)) {
 371                 /* process this endpoint */
 372                 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
 373                                               endpoint);
 374
 375                 /* sun4i_drv_add_endpoints can fail to allocate memory */
 376                 if (ret < 0)
 377                         return ret;
 378
 379                 count += ret;
 380         }
 381
 382         if (count)
 383                 return component_master_add_with_match(&pdev->dev,
 384                                                        &sun4i_drv_master_ops,
 385                                                        match);
 386         else
 387                 return 0;
 388 }
 389
 390 static int sun4i_drv_remove(struct platform_device *pdev)
 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-a33-display-engine" },
 403         { .compatible = "allwinner,sun8i-a83t-display-engine" },
 404         { .compatible = "allwinner,sun8i-h3-display-engine" },
 405         { .compatible = "allwinner,sun8i-r40-display-engine" },
 406         { .compatible = "allwinner,sun8i-v3s-display-engine" },
 407         { .compatible = "allwinner,sun9i-a80-display-engine" },
 408         { .compatible = "allwinner,sun50i-a64-display-engine" },
 409         { }
 410 };
 411 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 412
 413 static struct platform_driver sun4i_drv_platform_driver = {
 414         .probe          = sun4i_drv_probe,
 415         .remove         = sun4i_drv_remove,
 416         .driver         = {
 417                 .name           = "sun4i-drm",
 418                 .of_match_table = sun4i_drv_of_table,
 419         },
 420 };
 421 module_platform_driver(sun4i_drv_platform_driver);
 422
 423 MODULE_AUTHOR("Boris Brezillon <[email protected]>");
 424 MODULE_AUTHOR("Maxime Ripard <[email protected]>");
 425 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 426 MODULE_LICENSE("GPL");