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 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
 101         ret = component_bind_all(drm->dev, drm);
 102         if (ret) {
 103                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
 104                 goto cleanup_mode_config;
 105         }
 106
 107         /* drm_vblank_init calls kcalloc, which can fail */
 108         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 109         if (ret)
 110                 goto cleanup_mode_config;
 111
 112         drm->irq_enabled = true;
 113
 114         /* Remove early framebuffers (ie. simplefb) */
 115         drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
 116
 117         sun4i_framebuffer_init(drm);
 118
 119         /* Enable connectors polling */
 120         drm_kms_helper_poll_init(drm);
 121
 122         ret = drm_dev_register(drm, 0);
 123         if (ret)
 124                 goto finish_poll;
 125
 126         drm_fbdev_generic_setup(drm, 32);
 127
 128         return 0;
 129
 130 finish_poll:
 131         drm_kms_helper_poll_fini(drm);
 132 cleanup_mode_config:
 133         drm_mode_config_cleanup(drm);
 134         of_reserved_mem_device_release(dev);
 135 free_drm:
 136         drm_dev_put(drm);
 137         return ret;
 138 }
 139
 140 static void sun4i_drv_unbind(struct device *dev)
 141 {
 142         struct drm_device *drm = dev_get_drvdata(dev);
 143
 144         drm_dev_unregister(drm);
 145         drm_kms_helper_poll_fini(drm);
 146         drm_mode_config_cleanup(drm);
 147         of_reserved_mem_device_release(dev);
 148         drm_dev_put(drm);
 149 }
 150
 151 static const struct component_master_ops sun4i_drv_master_ops = {
 152         .bind   = sun4i_drv_bind,
 153         .unbind = sun4i_drv_unbind,
 154 };
 155
 156 static bool sun4i_drv_node_is_connector(struct device_node *node)
 157 {
 158         return of_device_is_compatible(node, "hdmi-connector");
 159 }
 160
 161 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 162 {
 163         return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
 164                 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 165                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 166                 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
 167                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
 168                 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
 169 }
 170
 171 static bool sun4i_drv_node_is_deu(struct device_node *node)
 172 {
 173         return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
 174 }
 175
 176 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
 177 {
 178         if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
 179                 return !!of_match_node(sun4i_frontend_of_table, node);
 180
 181         return false;
 182 }
 183
 184 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 185 {
 186         return !!of_match_node(sun4i_tcon_of_table, node);
 187 }
 188
 189 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
 190 {
 191         const struct of_device_id *match;
 192
 193         match = of_match_node(sun4i_tcon_of_table, node);
 194         if (match) {
 195                 struct sun4i_tcon_quirks *quirks;
 196
 197                 quirks = (struct sun4i_tcon_quirks *)match->data;
 198
 199                 return quirks->has_channel_0;
 200         }
 201
 202         return false;
 203 }
 204
 205 static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
 206 {
 207         return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
 208                 !!of_match_node(sun8i_tcon_top_of_table, node);
 209 }
 210
 211 static int compare_of(struct device *dev, void *data)
 212 {
 213         DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
 214                          dev->of_node,
 215                          data);
 216
 217         return dev->of_node == data;
 218 }
 219
 220 /*
 221  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 222  * crtcs from the device tree using of_graph. For the results to be
 223  * correct, encoders must be probed/bound after _all_ crtcs have been
 224  * created. The existing code uses a depth first recursive traversal
 225  * of the of_graph, which means the encoders downstream of the TCON
 226  * get add right after the first TCON. The second TCON or CRTC will
 227  * never be properly associated with encoders connected to it.
 228  *
 229  * Also, in a dual display pipeline setup, both frontends can feed
 230  * either backend, and both backends can feed either TCON, we want
 231  * all components of the same type to be added before the next type
 232  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 233  * i.e. components of the same type are at the same depth when counted
 234  * from the frontend. The only exception is the third pipeline in
 235  * the A80 SoC, which we do not support anyway.
 236  *
 237  * Hence we can use a breadth first search traversal order to add
 238  * components. We do not need to check for duplicates. The component
 239  * matching system handles this for us.
 240  */
 241 struct endpoint_list {
 242         DECLARE_KFIFO(fifo, struct device_node *, 16);
 243 };
 244
 245 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
 246                                          struct device_node *node,
 247                                          int port_id)
 248 {
 249         struct device_node *ep, *remote, *port;
 250
 251         port = of_graph_get_port_by_id(node, port_id);
 252         if (!port) {
 253                 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
 254                 return;
 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                         continue;
 262                 }
 263
 264                 if (sun4i_drv_node_is_tcon(node)) {
 265                         /*
 266                          * TCON TOP is always probed before TCON. However, TCON
 267                          * points back to TCON TOP when it is source for HDMI.
 268                          * We have to skip it here to prevent infinite looping
 269                          * between TCON TOP and TCON.
 270                          */
 271                         if (sun4i_drv_node_is_tcon_top(remote)) {
 272                                 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
 273                                 of_node_put(remote);
 274                                 continue;
 275                         }
 276
 277                         /*
 278                          * If the node is our TCON with channel 0, the first
 279                          * port is used for panel or bridges, and will not be
 280                          * part of the component framework.
 281                          */
 282                         if (sun4i_drv_node_is_tcon_with_ch0(node)) {
 283                                 struct of_endpoint endpoint;
 284
 285                                 if (of_graph_parse_endpoint(ep, &endpoint)) {
 286                                         DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 287                                         of_node_put(remote);
 288                                         continue;
 289                                 }
 290
 291                                 if (!endpoint.id) {
 292                                         DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 293                                         of_node_put(remote);
 294                                         continue;
 295                                 }
 296                         }
 297                 }
 298
 299                 kfifo_put(&list->fifo, remote);
 300         }
 301 }
 302
 303 static int sun4i_drv_add_endpoints(struct device *dev,
 304                                    struct endpoint_list *list,
 305                                    struct component_match **match,
 306                                    struct device_node *node)
 307 {
 308         int count = 0;
 309
 310         /*
 311          * The frontend has been disabled in some of our old device
 312          * trees. If we find a node that is the frontend and is
 313          * disabled, we should just follow through and parse its
 314          * child, but without adding it to the component list.
 315          * Otherwise, we obviously want to add it to the list.
 316          */
 317         if (!sun4i_drv_node_is_frontend(node) &&
 318             !of_device_is_available(node))
 319                 return 0;
 320
 321         /*
 322          * The connectors will be the last nodes in our pipeline, we
 323          * can just bail out.
 324          */
 325         if (sun4i_drv_node_is_connector(node))
 326                 return 0;
 327
 328         /*
 329          * If the device is either just a regular device, or an
 330          * enabled frontend supported by the driver, we add it to our
 331          * component list.
 332          */
 333         if (!(sun4i_drv_node_is_frontend(node) ||
 334               sun4i_drv_node_is_deu(node)) ||
 335             (sun4i_drv_node_is_supported_frontend(node) &&
 336              of_device_is_available(node))) {
 337                 /* Add current component */
 338                 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
 339                 drm_of_component_match_add(dev, match, compare_of, node);
 340                 count++;
 341         }
 342
 343         /* each node has at least one output */
 344         sun4i_drv_traverse_endpoints(list, node, 1);
 345
 346         /* TCON TOP has second and third output */
 347         if (sun4i_drv_node_is_tcon_top(node)) {
 348                 sun4i_drv_traverse_endpoints(list, node, 3);
 349                 sun4i_drv_traverse_endpoints(list, node, 5);
 350         }
 351
 352         return count;
 353 }
 354
 355 static int sun4i_drv_probe(struct platform_device *pdev)
 356 {
 357         struct component_match *match = NULL;
 358         struct device_node *np = pdev->dev.of_node, *endpoint;
 359         struct endpoint_list list;
 360         int i, ret, count = 0;
 361
 362         INIT_KFIFO(list.fifo);
 363
 364         for (i = 0;; i++) {
 365                 struct device_node *pipeline = of_parse_phandle(np,
 366                                                                 "allwinner,pipelines",
 367                                                                 i);
 368                 if (!pipeline)
 369                         break;
 370
 371                 kfifo_put(&list.fifo, pipeline);
 372         }
 373
 374         while (kfifo_get(&list.fifo, &endpoint)) {
 375                 /* process this endpoint */
 376                 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
 377                                               endpoint);
 378
 379                 /* sun4i_drv_add_endpoints can fail to allocate memory */
 380                 if (ret < 0)
 381                         return ret;
 382
 383                 count += ret;
 384         }
 385
 386         if (count)
 387                 return component_master_add_with_match(&pdev->dev,
 388                                                        &sun4i_drv_master_ops,
 389                                                        match);
 390         else
 391                 return 0;
 392 }
 393
 394 static int sun4i_drv_remove(struct platform_device *pdev)
 395 {
 396         return 0;
 397 }
 398
 399 static const struct of_device_id sun4i_drv_of_table[] = {
 400         { .compatible = "allwinner,sun4i-a10-display-engine" },
 401         { .compatible = "allwinner,sun5i-a10s-display-engine" },
 402         { .compatible = "allwinner,sun5i-a13-display-engine" },
 403         { .compatible = "allwinner,sun6i-a31-display-engine" },
 404         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 405         { .compatible = "allwinner,sun7i-a20-display-engine" },
 406         { .compatible = "allwinner,sun8i-a33-display-engine" },
 407         { .compatible = "allwinner,sun8i-a83t-display-engine" },
 408         { .compatible = "allwinner,sun8i-h3-display-engine" },
 409         { .compatible = "allwinner,sun8i-r40-display-engine" },
 410         { .compatible = "allwinner,sun8i-v3s-display-engine" },
 411         { .compatible = "allwinner,sun9i-a80-display-engine" },
 412         { .compatible = "allwinner,sun50i-a64-display-engine" },
 413         { .compatible = "allwinner,sun50i-h6-display-engine" },
 414         { }
 415 };
 416 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 417
 418 static struct platform_driver sun4i_drv_platform_driver = {
 419         .probe          = sun4i_drv_probe,
 420         .remove         = sun4i_drv_remove,
 421         .driver         = {
 422                 .name           = "sun4i-drm",
 423                 .of_match_table = sun4i_drv_of_table,
 424         },
 425 };
 426 module_platform_driver(sun4i_drv_platform_driver);
 427
 428 MODULE_AUTHOR("Boris Brezillon <[email protected]>");
 429 MODULE_AUTHOR("Maxime Ripard <[email protected]>");
 430 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 431 MODULE_LICENSE("GPL");