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_atomic_helper.h>
  20 #include <drm/drm_fb_cma_helper.h>
  21 #include <drm/drm_fb_helper.h>
  22 #include <drm/drm_gem_cma_helper.h>
  23 #include <drm/drm_of.h>
  24 #include <drm/drm_probe_helper.h>
  25
  26 #include "sun4i_drv.h"
  27 #include "sun4i_frontend.h"
  28 #include "sun4i_framebuffer.h"
  29 #include "sun4i_tcon.h"
  30 #include "sun8i_tcon_top.h"
  31
  32 static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv,
  33                                      struct drm_device *drm,
  34                                      struct drm_mode_create_dumb *args)
  35 {
  36         /* The hardware only allows even pitches for YUV buffers. */
  37         args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2);
  38
  39         return drm_gem_cma_dumb_create_internal(file_priv, drm, args);
  40 }
  41
  42 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
  43
  44 static struct drm_driver sun4i_drv_driver = {
  45         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
  46
  47         /* Generic Operations */
  48         .fops                   = &sun4i_drv_fops,
  49         .name                   = "sun4i-drm",
  50         .desc                   = "Allwinner sun4i Display Engine",
  51         .date                   = "20150629",
  52         .major                  = 1,
  53         .minor                  = 0,
  54
  55         /* GEM Operations */
  56         .dumb_create            = drm_sun4i_gem_dumb_create,
  57         .gem_free_object_unlocked = drm_gem_cma_free_object,
  58         .gem_vm_ops             = &drm_gem_cma_vm_ops,
  59
  60         /* PRIME Operations */
  61         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  62         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  63         .gem_prime_import       = drm_gem_prime_import,
  64         .gem_prime_export       = drm_gem_prime_export,
  65         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  66         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  67         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
  68         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
  69         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
  70
  71         /* Frame Buffer Operations */
  72 };
  73
  74 static int sun4i_drv_bind(struct device *dev)
  75 {
  76         struct drm_device *drm;
  77         struct sun4i_drv *drv;
  78         int ret;
  79
  80         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
  81         if (IS_ERR(drm))
  82                 return PTR_ERR(drm);
  83
  84         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
  85         if (!drv) {
  86                 ret = -ENOMEM;
  87                 goto free_drm;
  88         }
  89
  90         dev_set_drvdata(dev, drm);
  91         drm->dev_private = drv;
  92         INIT_LIST_HEAD(&drv->frontend_list);
  93         INIT_LIST_HEAD(&drv->engine_list);
  94         INIT_LIST_HEAD(&drv->tcon_list);
  95
  96         ret = of_reserved_mem_device_init(dev);
  97         if (ret && ret != -ENODEV) {
  98                 dev_err(drm->dev, "Couldn't claim our memory region\n");
  99                 goto free_drm;
 100         }
 101
 102         drm_mode_config_init(drm);
 103         drm->mode_config.allow_fb_modifiers = true;
 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 cleanup_mode_config;
 115
 116         drm->irq_enabled = true;
 117
 118         /* Remove early framebuffers (ie. simplefb) */
 119         drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
 120
 121         sun4i_framebuffer_init(drm);
 122
 123         /* Enable connectors polling */
 124         drm_kms_helper_poll_init(drm);
 125
 126         ret = drm_dev_register(drm, 0);
 127         if (ret)
 128                 goto finish_poll;
 129
 130         drm_fbdev_generic_setup(drm, 32);
 131
 132         return 0;
 133
 134 finish_poll:
 135         drm_kms_helper_poll_fini(drm);
 136 cleanup_mode_config:
 137         drm_mode_config_cleanup(drm);
 138         of_reserved_mem_device_release(dev);
 139 free_drm:
 140         drm_dev_put(drm);
 141         return ret;
 142 }
 143
 144 static void sun4i_drv_unbind(struct device *dev)
 145 {
 146         struct drm_device *drm = dev_get_drvdata(dev);
 147
 148         drm_dev_unregister(drm);
 149         drm_kms_helper_poll_fini(drm);
 150         drm_atomic_helper_shutdown(drm);
 151         drm_mode_config_cleanup(drm);
 152
 153         component_unbind_all(dev, NULL);
 154         of_reserved_mem_device_release(dev);
 155
 156         drm_dev_put(drm);
 157 }
 158
 159 static const struct component_master_ops sun4i_drv_master_ops = {
 160         .bind   = sun4i_drv_bind,
 161         .unbind = sun4i_drv_unbind,
 162 };
 163
 164 static bool sun4i_drv_node_is_connector(struct device_node *node)
 165 {
 166         return of_device_is_compatible(node, "hdmi-connector");
 167 }
 168
 169 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 170 {
 171         return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
 172                 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 173                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 174                 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
 175                 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||
 176                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
 177                 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
 178 }
 179
 180 static bool sun4i_drv_node_is_deu(struct device_node *node)
 181 {
 182         return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
 183 }
 184
 185 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
 186 {
 187         if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
 188                 return !!of_match_node(sun4i_frontend_of_table, node);
 189
 190         return false;
 191 }
 192
 193 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 194 {
 195         return !!of_match_node(sun4i_tcon_of_table, node);
 196 }
 197
 198 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
 199 {
 200         const struct of_device_id *match;
 201
 202         match = of_match_node(sun4i_tcon_of_table, node);
 203         if (match) {
 204                 struct sun4i_tcon_quirks *quirks;
 205
 206                 quirks = (struct sun4i_tcon_quirks *)match->data;
 207
 208                 return quirks->has_channel_0;
 209         }
 210
 211         return false;
 212 }
 213
 214 static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
 215 {
 216         return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
 217                 !!of_match_node(sun8i_tcon_top_of_table, node);
 218 }
 219
 220 static int compare_of(struct device *dev, void *data)
 221 {
 222         DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
 223                          dev->of_node,
 224                          data);
 225
 226         return dev->of_node == data;
 227 }
 228
 229 /*
 230  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 231  * crtcs from the device tree using of_graph. For the results to be
 232  * correct, encoders must be probed/bound after _all_ crtcs have been
 233  * created. The existing code uses a depth first recursive traversal
 234  * of the of_graph, which means the encoders downstream of the TCON
 235  * get add right after the first TCON. The second TCON or CRTC will
 236  * never be properly associated with encoders connected to it.
 237  *
 238  * Also, in a dual display pipeline setup, both frontends can feed
 239  * either backend, and both backends can feed either TCON, we want
 240  * all components of the same type to be added before the next type
 241  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 242  * i.e. components of the same type are at the same depth when counted
 243  * from the frontend. The only exception is the third pipeline in
 244  * the A80 SoC, which we do not support anyway.
 245  *
 246  * Hence we can use a breadth first search traversal order to add
 247  * components. We do not need to check for duplicates. The component
 248  * matching system handles this for us.
 249  */
 250 struct endpoint_list {
 251         DECLARE_KFIFO(fifo, struct device_node *, 16);
 252 };
 253
 254 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
 255                                          struct device_node *node,
 256                                          int port_id)
 257 {
 258         struct device_node *ep, *remote, *port;
 259
 260         port = of_graph_get_port_by_id(node, port_id);
 261         if (!port) {
 262                 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
 263                 return;
 264         }
 265
 266         for_each_available_child_of_node(port, ep) {
 267                 remote = of_graph_get_remote_port_parent(ep);
 268                 if (!remote) {
 269                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 270                         continue;
 271                 }
 272
 273                 if (sun4i_drv_node_is_tcon(node)) {
 274                         /*
 275                          * TCON TOP is always probed before TCON. However, TCON
 276                          * points back to TCON TOP when it is source for HDMI.
 277                          * We have to skip it here to prevent infinite looping
 278                          * between TCON TOP and TCON.
 279                          */
 280                         if (sun4i_drv_node_is_tcon_top(remote)) {
 281                                 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
 282                                 of_node_put(remote);
 283                                 continue;
 284                         }
 285
 286                         /*
 287                          * If the node is our TCON with channel 0, the first
 288                          * port is used for panel or bridges, and will not be
 289                          * part of the component framework.
 290                          */
 291                         if (sun4i_drv_node_is_tcon_with_ch0(node)) {
 292                                 struct of_endpoint endpoint;
 293
 294                                 if (of_graph_parse_endpoint(ep, &endpoint)) {
 295                                         DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 296                                         of_node_put(remote);
 297                                         continue;
 298                                 }
 299
 300                                 if (!endpoint.id) {
 301                                         DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 302                                         of_node_put(remote);
 303                                         continue;
 304                                 }
 305                         }
 306                 }
 307
 308                 kfifo_put(&list->fifo, remote);
 309         }
 310 }
 311
 312 static int sun4i_drv_add_endpoints(struct device *dev,
 313                                    struct endpoint_list *list,
 314                                    struct component_match **match,
 315                                    struct device_node *node)
 316 {
 317         int count = 0;
 318
 319         /*
 320          * The frontend has been disabled in some of our old device
 321          * trees. If we find a node that is the frontend and is
 322          * disabled, we should just follow through and parse its
 323          * child, but without adding it to the component list.
 324          * Otherwise, we obviously want to add it to the list.
 325          */
 326         if (!sun4i_drv_node_is_frontend(node) &&
 327             !of_device_is_available(node))
 328                 return 0;
 329
 330         /*
 331          * The connectors will be the last nodes in our pipeline, we
 332          * can just bail out.
 333          */
 334         if (sun4i_drv_node_is_connector(node))
 335                 return 0;
 336
 337         /*
 338          * If the device is either just a regular device, or an
 339          * enabled frontend supported by the driver, we add it to our
 340          * component list.
 341          */
 342         if (!(sun4i_drv_node_is_frontend(node) ||
 343               sun4i_drv_node_is_deu(node)) ||
 344             (sun4i_drv_node_is_supported_frontend(node) &&
 345              of_device_is_available(node))) {
 346                 /* Add current component */
 347                 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
 348                 drm_of_component_match_add(dev, match, compare_of, node);
 349                 count++;
 350         }
 351
 352         /* each node has at least one output */
 353         sun4i_drv_traverse_endpoints(list, node, 1);
 354
 355         /* TCON TOP has second and third output */
 356         if (sun4i_drv_node_is_tcon_top(node)) {
 357                 sun4i_drv_traverse_endpoints(list, node, 3);
 358                 sun4i_drv_traverse_endpoints(list, node, 5);
 359         }
 360
 361         return count;
 362 }
 363
 364 static int sun4i_drv_probe(struct platform_device *pdev)
 365 {
 366         struct component_match *match = NULL;
 367         struct device_node *np = pdev->dev.of_node, *endpoint;
 368         struct endpoint_list list;
 369         int i, ret, count = 0;
 370
 371         INIT_KFIFO(list.fifo);
 372
 373         for (i = 0;; i++) {
 374                 struct device_node *pipeline = of_parse_phandle(np,
 375                                                                 "allwinner,pipelines",
 376                                                                 i);
 377                 if (!pipeline)
 378                         break;
 379
 380                 kfifo_put(&list.fifo, pipeline);
 381         }
 382
 383         while (kfifo_get(&list.fifo, &endpoint)) {
 384                 /* process this endpoint */
 385                 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
 386                                               endpoint);
 387
 388                 /* sun4i_drv_add_endpoints can fail to allocate memory */
 389                 if (ret < 0)
 390                         return ret;
 391
 392                 count += ret;
 393         }
 394
 395         if (count)
 396                 return component_master_add_with_match(&pdev->dev,
 397                                                        &sun4i_drv_master_ops,
 398                                                        match);
 399         else
 400                 return 0;
 401 }
 402
 403 static int sun4i_drv_remove(struct platform_device *pdev)
 404 {
 405         component_master_del(&pdev->dev, &sun4i_drv_master_ops);
 406
 407         return 0;
 408 }
 409
 410 static const struct of_device_id sun4i_drv_of_table[] = {
 411         { .compatible = "allwinner,sun4i-a10-display-engine" },
 412         { .compatible = "allwinner,sun5i-a10s-display-engine" },
 413         { .compatible = "allwinner,sun5i-a13-display-engine" },
 414         { .compatible = "allwinner,sun6i-a31-display-engine" },
 415         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 416         { .compatible = "allwinner,sun7i-a20-display-engine" },
 417         { .compatible = "allwinner,sun8i-a23-display-engine" },
 418         { .compatible = "allwinner,sun8i-a33-display-engine" },
 419         { .compatible = "allwinner,sun8i-a83t-display-engine" },
 420         { .compatible = "allwinner,sun8i-h3-display-engine" },
 421         { .compatible = "allwinner,sun8i-r40-display-engine" },
 422         { .compatible = "allwinner,sun8i-v3s-display-engine" },
 423         { .compatible = "allwinner,sun9i-a80-display-engine" },
 424         { .compatible = "allwinner,sun50i-a64-display-engine" },
 425         { .compatible = "allwinner,sun50i-h6-display-engine" },
 426         { }
 427 };
 428 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 429
 430 static struct platform_driver sun4i_drv_platform_driver = {
 431         .probe          = sun4i_drv_probe,
 432         .remove         = sun4i_drv_remove,
 433         .driver         = {
 434                 .name           = "sun4i-drm",
 435                 .of_match_table = sun4i_drv_of_table,
 436         },
 437 };
 438 module_platform_driver(sun4i_drv_platform_driver);
 439
 440 MODULE_AUTHOR("Boris Brezillon <[email protected]>");
 441 MODULE_AUTHOR("Maxime Ripard <[email protected]>");
 442 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 443 MODULE_LICENSE("GPL");