drivers/gpu/drm/sun4i/sun4i_drv.c

   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_fb_cma_helper.h>
  20 #include <drm/drm_fb_helper.h>
  21 #include <drm/drm_gem_cma_helper.h>
  22 #include <drm/drm_of.h>
  23 #include <drm/drm_probe_helper.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_PRIME | 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         .dumb_create            = drm_sun4i_gem_dumb_create,
  56         .gem_free_object_unlocked = drm_gem_cma_free_object,
  57         .gem_vm_ops             = &drm_gem_cma_vm_ops,
  58
  59         /* PRIME Operations */
  60         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  61         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  62         .gem_prime_import       = drm_gem_prime_import,
  63         .gem_prime_export       = drm_gem_prime_export,
  64         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  65         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  66         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
  67         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
  68         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
  69
  70         /* Frame Buffer Operations */
  71 };
  72
  73 static int sun4i_drv_bind(struct device *dev)
  74 {
  75         struct drm_device *drm;
  76         struct sun4i_drv *drv;
  77         int ret;
  78
  79         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
  80         if (IS_ERR(drm))
  81                 return PTR_ERR(drm);
  82
  83         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
  84         if (!drv) {
  85                 ret = -ENOMEM;
  86                 goto free_drm;
  87         }
  88         drm->dev_private = drv;
  89         INIT_LIST_HEAD(&drv->frontend_list);
  90         INIT_LIST_HEAD(&drv->engine_list);
  91         INIT_LIST_HEAD(&drv->tcon_list);
  92
  93         ret = of_reserved_mem_device_init(dev);
  94         if (ret && ret != -ENODEV) {
  95                 dev_err(drm->dev, "Couldn't claim our memory region\n");
  96                 goto free_drm;
  97         }
  98
  99         drm_mode_config_init(drm);
 100         drm->mode_config.allow_fb_modifiers = true;
 101
 102         ret = component_bind_all(drm->dev, drm);
 103         if (ret) {
 104                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
 105                 goto cleanup_mode_config;
 106         }
 107
 108         /* drm_vblank_init calls kcalloc, which can fail */
 109         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 110         if (ret)
 111                 goto cleanup_mode_config;
 112
 113         drm->irq_enabled = true;
 114
 115         /* Remove early framebuffers (ie. simplefb) */
 116         drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
 117
 118         sun4i_framebuffer_init(drm);
 119
 120         /* Enable connectors polling */
 121         drm_kms_helper_poll_init(drm);
 122
 123         ret = drm_dev_register(drm, 0);
 124         if (ret)
 125                 goto finish_poll;
 126
 127         drm_fbdev_generic_setup(drm, 32);
 128
 129         return 0;
 130
 131 finish_poll:
 132         drm_kms_helper_poll_fini(drm);
 133 cleanup_mode_config:
 134         drm_mode_config_cleanup(drm);
 135         of_reserved_mem_device_release(dev);
 136 free_drm:
 137         drm_dev_put(drm);
 138         return ret;
 139 }
 140
 141 static void sun4i_drv_unbind(struct device *dev)
 142 {
 143         struct drm_device *drm = dev_get_drvdata(dev);
 144
 145         drm_dev_unregister(drm);
 146         drm_kms_helper_poll_fini(drm);
 147         drm_mode_config_cleanup(drm);
 148         of_reserved_mem_device_release(dev);
 149         drm_dev_put(drm);
 150 }
 151
 152 static const struct component_master_ops sun4i_drv_master_ops = {
 153         .bind   = sun4i_drv_bind,
 154         .unbind = sun4i_drv_unbind,
 155 };
 156
 157 static bool sun4i_drv_node_is_connector(struct device_node *node)
 158 {
 159         return of_device_is_compatible(node, "hdmi-connector");
 160 }
 161
 162 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 163 {
 164         return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
 165                 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 166                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 167                 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
 168                 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||
 169                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
 170                 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
 171 }
 172
 173 static bool sun4i_drv_node_is_deu(struct device_node *node)
 174 {
 175         return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
 176 }
 177
 178 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
 179 {
 180         if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
 181                 return !!of_match_node(sun4i_frontend_of_table, node);
 182
 183         return false;
 184 }
 185
 186 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 187 {
 188         return !!of_match_node(sun4i_tcon_of_table, node);
 189 }
 190
 191 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
 192 {
 193         const struct of_device_id *match;
 194
 195         match = of_match_node(sun4i_tcon_of_table, node);
 196         if (match) {
 197                 struct sun4i_tcon_quirks *quirks;
 198
 199                 quirks = (struct sun4i_tcon_quirks *)match->data;
 200
 201                 return quirks->has_channel_0;
 202         }
 203
 204         return false;
 205 }
 206
 207 static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
 208 {
 209         return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
 210                 !!of_match_node(sun8i_tcon_top_of_table, node);
 211 }
 212
 213 static int compare_of(struct device *dev, void *data)
 214 {
 215         DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
 216                          dev->of_node,
 217                          data);
 218
 219         return dev->of_node == data;
 220 }
 221
 222 /*
 223  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 224  * crtcs from the device tree using of_graph. For the results to be
 225  * correct, encoders must be probed/bound after _all_ crtcs have been
 226  * created. The existing code uses a depth first recursive traversal
 227  * of the of_graph, which means the encoders downstream of the TCON
 228  * get add right after the first TCON. The second TCON or CRTC will
 229  * never be properly associated with encoders connected to it.
 230  *
 231  * Also, in a dual display pipeline setup, both frontends can feed
 232  * either backend, and both backends can feed either TCON, we want
 233  * all components of the same type to be added before the next type
 234  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 235  * i.e. components of the same type are at the same depth when counted
 236  * from the frontend. The only exception is the third pipeline in
 237  * the A80 SoC, which we do not support anyway.
 238  *
 239  * Hence we can use a breadth first search traversal order to add
 240  * components. We do not need to check for duplicates. The component
 241  * matching system handles this for us.
 242  */
 243 struct endpoint_list {
 244         DECLARE_KFIFO(fifo, struct device_node *, 16);
 245 };
 246
 247 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
 248                                          struct device_node *node,
 249                                          int port_id)
 250 {
 251         struct device_node *ep, *remote, *port;
 252
 253         port = of_graph_get_port_by_id(node, port_id);
 254         if (!port) {
 255                 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
 256                 return;
 257         }
 258
 259         for_each_available_child_of_node(port, ep) {
 260                 remote = of_graph_get_remote_port_parent(ep);
 261                 if (!remote) {
 262                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 263                         continue;
 264                 }
 265
 266                 if (sun4i_drv_node_is_tcon(node)) {
 267                         /*
 268                          * TCON TOP is always probed before TCON. However, TCON
 269                          * points back to TCON TOP when it is source for HDMI.
 270                          * We have to skip it here to prevent infinite looping
 271                          * between TCON TOP and TCON.
 272                          */
 273                         if (sun4i_drv_node_is_tcon_top(remote)) {
 274                                 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
 275                                 of_node_put(remote);
 276                                 continue;
 277                         }
 278
 279                         /*
 280                          * If the node is our TCON with channel 0, the first
 281                          * port is used for panel or bridges, and will not be
 282                          * part of the component framework.
 283                          */
 284                         if (sun4i_drv_node_is_tcon_with_ch0(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                                         of_node_put(remote);
 290                                         continue;
 291                                 }
 292
 293                                 if (!endpoint.id) {
 294                                         DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 295                                         of_node_put(remote);
 296                                         continue;
 297                                 }
 298                         }
 299                 }
 300
 301                 kfifo_put(&list->fifo, remote);
 302         }
 303 }
 304
 305 static int sun4i_drv_add_endpoints(struct device *dev,
 306                                    struct endpoint_list *list,
 307                                    struct component_match **match,
 308                                    struct device_node *node)
 309 {
 310         int count = 0;
 311
 312         /*
 313          * The frontend has been disabled in some of our old device
 314          * trees. If we find a node that is the frontend and is
 315          * disabled, we should just follow through and parse its
 316          * child, but without adding it to the component list.
 317          * Otherwise, we obviously want to add it to the list.
 318          */
 319         if (!sun4i_drv_node_is_frontend(node) &&
 320             !of_device_is_available(node))
 321                 return 0;
 322
 323         /*
 324          * The connectors will be the last nodes in our pipeline, we
 325          * can just bail out.
 326          */
 327         if (sun4i_drv_node_is_connector(node))
 328                 return 0;
 329
 330         /*
 331          * If the device is either just a regular device, or an
 332          * enabled frontend supported by the driver, we add it to our
 333          * component list.
 334          */
 335         if (!(sun4i_drv_node_is_frontend(node) ||
 336               sun4i_drv_node_is_deu(node)) ||
 337             (sun4i_drv_node_is_supported_frontend(node) &&
 338              of_device_is_available(node))) {
 339                 /* Add current component */
 340                 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
 341                 drm_of_component_match_add(dev, match, compare_of, node);
 342                 count++;
 343         }
 344
 345         /* each node has at least one output */
 346         sun4i_drv_traverse_endpoints(list, node, 1);
 347
 348         /* TCON TOP has second and third output */
 349         if (sun4i_drv_node_is_tcon_top(node)) {
 350                 sun4i_drv_traverse_endpoints(list, node, 3);
 351                 sun4i_drv_traverse_endpoints(list, node, 5);
 352         }
 353
 354         return count;
 355 }
 356
 357 static int sun4i_drv_probe(struct platform_device *pdev)
 358 {
 359         struct component_match *match = NULL;
 360         struct device_node *np = pdev->dev.of_node, *endpoint;
 361         struct endpoint_list list;
 362         int i, ret, count = 0;
 363
 364         INIT_KFIFO(list.fifo);
 365
 366         for (i = 0;; i++) {
 367                 struct device_node *pipeline = of_parse_phandle(np,
 368                                                                 "allwinner,pipelines",
 369                                                                 i);
 370                 if (!pipeline)
 371                         break;
 372
 373                 kfifo_put(&list.fifo, pipeline);
 374         }
 375
 376         while (kfifo_get(&list.fifo, &endpoint)) {
 377                 /* process this endpoint */
 378                 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
 379                                               endpoint);
 380
 381                 /* sun4i_drv_add_endpoints can fail to allocate memory */
 382                 if (ret < 0)
 383                         return ret;
 384
 385                 count += ret;
 386         }
 387
 388         if (count)
 389                 return component_master_add_with_match(&pdev->dev,
 390                                                        &sun4i_drv_master_ops,
 391                                                        match);
 392         else
 393                 return 0;
 394 }
 395
 396 static int sun4i_drv_remove(struct platform_device *pdev)
 397 {
 398         return 0;
 399 }
 400
 401 static const struct of_device_id sun4i_drv_of_table[] = {
 402         { .compatible = "allwinner,sun4i-a10-display-engine" },
 403         { .compatible = "allwinner,sun5i-a10s-display-engine" },
 404         { .compatible = "allwinner,sun5i-a13-display-engine" },
 405         { .compatible = "allwinner,sun6i-a31-display-engine" },
 406         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 407         { .compatible = "allwinner,sun7i-a20-display-engine" },
 408         { .compatible = "allwinner,sun8i-a23-display-engine" },
 409         { .compatible = "allwinner,sun8i-a33-display-engine" },
 410         { .compatible = "allwinner,sun8i-a83t-display-engine" },
 411         { .compatible = "allwinner,sun8i-h3-display-engine" },
 412         { .compatible = "allwinner,sun8i-r40-display-engine" },
 413         { .compatible = "allwinner,sun8i-v3s-display-engine" },
 414         { .compatible = "allwinner,sun9i-a80-display-engine" },
 415         { .compatible = "allwinner,sun50i-a64-display-engine" },
 416         { .compatible = "allwinner,sun50i-h6-display-engine" },
 417         { }
 418 };
 419 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 420
 421 static struct platform_driver sun4i_drv_platform_driver = {
 422         .probe          = sun4i_drv_probe,
 423         .remove         = sun4i_drv_remove,
 424         .driver         = {
 425                 .name           = "sun4i-drm",
 426                 .of_match_table = sun4i_drv_of_table,
 427         },
 428 };
 429 module_platform_driver(sun4i_drv_platform_driver);
 430
 431 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 432 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 433 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 434 MODULE_LICENSE("GPL");