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_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         DRM_GEM_CMA_VMAP_DRIVER_OPS,
  57         .dumb_create            = drm_sun4i_gem_dumb_create,
  58 };
  59
  60 static int sun4i_drv_bind(struct device *dev)
  61 {
  62         struct drm_device *drm;
  63         struct sun4i_drv *drv;
  64         int ret;
  65
  66         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
  67         if (IS_ERR(drm))
  68                 return PTR_ERR(drm);
  69
  70         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
  71         if (!drv) {
  72                 ret = -ENOMEM;
  73                 goto free_drm;
  74         }
  75
  76         dev_set_drvdata(dev, drm);
  77         drm->dev_private = drv;
  78         INIT_LIST_HEAD(&drv->frontend_list);
  79         INIT_LIST_HEAD(&drv->engine_list);
  80         INIT_LIST_HEAD(&drv->tcon_list);
  81
  82         ret = of_reserved_mem_device_init(dev);
  83         if (ret && ret != -ENODEV) {
  84                 dev_err(drm->dev, "Couldn't claim our memory region\n");
  85                 goto free_drm;
  86         }
  87
  88         drm_mode_config_init(drm);
  89         drm->mode_config.allow_fb_modifiers = true;
  90
  91         ret = component_bind_all(drm->dev, drm);
  92         if (ret) {
  93                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
  94                 goto cleanup_mode_config;
  95         }
  96
  97         /* drm_vblank_init calls kcalloc, which can fail */
  98         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
  99         if (ret)
 100                 goto cleanup_mode_config;
 101
 102         drm->irq_enabled = true;
 103
 104         /* Remove early framebuffers (ie. simplefb) */
 105         drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
 106
 107         sun4i_framebuffer_init(drm);
 108
 109         /* Enable connectors polling */
 110         drm_kms_helper_poll_init(drm);
 111
 112         ret = drm_dev_register(drm, 0);
 113         if (ret)
 114                 goto finish_poll;
 115
 116         drm_fbdev_generic_setup(drm, 32);
 117
 118         return 0;
 119
 120 finish_poll:
 121         drm_kms_helper_poll_fini(drm);
 122 cleanup_mode_config:
 123         drm_mode_config_cleanup(drm);
 124         of_reserved_mem_device_release(dev);
 125 free_drm:
 126         drm_dev_put(drm);
 127         return ret;
 128 }
 129
 130 static void sun4i_drv_unbind(struct device *dev)
 131 {
 132         struct drm_device *drm = dev_get_drvdata(dev);
 133
 134         drm_dev_unregister(drm);
 135         drm_kms_helper_poll_fini(drm);
 136         drm_atomic_helper_shutdown(drm);
 137         drm_mode_config_cleanup(drm);
 138
 139         component_unbind_all(dev, NULL);
 140         of_reserved_mem_device_release(dev);
 141
 142         drm_dev_put(drm);
 143 }
 144
 145 static const struct component_master_ops sun4i_drv_master_ops = {
 146         .bind   = sun4i_drv_bind,
 147         .unbind = sun4i_drv_unbind,
 148 };
 149
 150 static bool sun4i_drv_node_is_connector(struct device_node *node)
 151 {
 152         return of_device_is_compatible(node, "hdmi-connector");
 153 }
 154
 155 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 156 {
 157         return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
 158                 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 159                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 160                 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
 161                 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||
 162                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
 163                 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
 164 }
 165
 166 static bool sun4i_drv_node_is_deu(struct device_node *node)
 167 {
 168         return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
 169 }
 170
 171 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
 172 {
 173         if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
 174                 return !!of_match_node(sun4i_frontend_of_table, node);
 175
 176         return false;
 177 }
 178
 179 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 180 {
 181         return !!of_match_node(sun4i_tcon_of_table, node);
 182 }
 183
 184 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
 185 {
 186         const struct of_device_id *match;
 187
 188         match = of_match_node(sun4i_tcon_of_table, node);
 189         if (match) {
 190                 struct sun4i_tcon_quirks *quirks;
 191
 192                 quirks = (struct sun4i_tcon_quirks *)match->data;
 193
 194                 return quirks->has_channel_0;
 195         }
 196
 197         return false;
 198 }
 199
 200 static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
 201 {
 202         return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
 203                 !!of_match_node(sun8i_tcon_top_of_table, node);
 204 }
 205
 206 static int compare_of(struct device *dev, void *data)
 207 {
 208         DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
 209                          dev->of_node,
 210                          data);
 211
 212         return dev->of_node == data;
 213 }
 214
 215 /*
 216  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 217  * crtcs from the device tree using of_graph. For the results to be
 218  * correct, encoders must be probed/bound after _all_ crtcs have been
 219  * created. The existing code uses a depth first recursive traversal
 220  * of the of_graph, which means the encoders downstream of the TCON
 221  * get add right after the first TCON. The second TCON or CRTC will
 222  * never be properly associated with encoders connected to it.
 223  *
 224  * Also, in a dual display pipeline setup, both frontends can feed
 225  * either backend, and both backends can feed either TCON, we want
 226  * all components of the same type to be added before the next type
 227  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 228  * i.e. components of the same type are at the same depth when counted
 229  * from the frontend. The only exception is the third pipeline in
 230  * the A80 SoC, which we do not support anyway.
 231  *
 232  * Hence we can use a breadth first search traversal order to add
 233  * components. We do not need to check for duplicates. The component
 234  * matching system handles this for us.
 235  */
 236 struct endpoint_list {
 237         DECLARE_KFIFO(fifo, struct device_node *, 16);
 238 };
 239
 240 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
 241                                          struct device_node *node,
 242                                          int port_id)
 243 {
 244         struct device_node *ep, *remote, *port;
 245
 246         port = of_graph_get_port_by_id(node, port_id);
 247         if (!port) {
 248                 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
 249                 return;
 250         }
 251
 252         for_each_available_child_of_node(port, ep) {
 253                 remote = of_graph_get_remote_port_parent(ep);
 254                 if (!remote) {
 255                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 256                         continue;
 257                 }
 258
 259                 if (sun4i_drv_node_is_tcon(node)) {
 260                         /*
 261                          * TCON TOP is always probed before TCON. However, TCON
 262                          * points back to TCON TOP when it is source for HDMI.
 263                          * We have to skip it here to prevent infinite looping
 264                          * between TCON TOP and TCON.
 265                          */
 266                         if (sun4i_drv_node_is_tcon_top(remote)) {
 267                                 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
 268                                 of_node_put(remote);
 269                                 continue;
 270                         }
 271
 272                         /*
 273                          * If the node is our TCON with channel 0, the first
 274                          * port is used for panel or bridges, and will not be
 275                          * part of the component framework.
 276                          */
 277                         if (sun4i_drv_node_is_tcon_with_ch0(node)) {
 278                                 struct of_endpoint endpoint;
 279
 280                                 if (of_graph_parse_endpoint(ep, &endpoint)) {
 281                                         DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 282                                         of_node_put(remote);
 283                                         continue;
 284                                 }
 285
 286                                 if (!endpoint.id) {
 287                                         DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 288                                         of_node_put(remote);
 289                                         continue;
 290                                 }
 291                         }
 292                 }
 293
 294                 kfifo_put(&list->fifo, remote);
 295         }
 296 }
 297
 298 static int sun4i_drv_add_endpoints(struct device *dev,
 299                                    struct endpoint_list *list,
 300                                    struct component_match **match,
 301                                    struct device_node *node)
 302 {
 303         int count = 0;
 304
 305         /*
 306          * The frontend has been disabled in some of our old device
 307          * trees. If we find a node that is the frontend and is
 308          * disabled, we should just follow through and parse its
 309          * child, but without adding it to the component list.
 310          * Otherwise, we obviously want to add it to the list.
 311          */
 312         if (!sun4i_drv_node_is_frontend(node) &&
 313             !of_device_is_available(node))
 314                 return 0;
 315
 316         /*
 317          * The connectors will be the last nodes in our pipeline, we
 318          * can just bail out.
 319          */
 320         if (sun4i_drv_node_is_connector(node))
 321                 return 0;
 322
 323         /*
 324          * If the device is either just a regular device, or an
 325          * enabled frontend supported by the driver, we add it to our
 326          * component list.
 327          */
 328         if (!(sun4i_drv_node_is_frontend(node) ||
 329               sun4i_drv_node_is_deu(node)) ||
 330             (sun4i_drv_node_is_supported_frontend(node) &&
 331              of_device_is_available(node))) {
 332                 /* Add current component */
 333                 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
 334                 drm_of_component_match_add(dev, match, compare_of, node);
 335                 count++;
 336         }
 337
 338         /* each node has at least one output */
 339         sun4i_drv_traverse_endpoints(list, node, 1);
 340
 341         /* TCON TOP has second and third output */
 342         if (sun4i_drv_node_is_tcon_top(node)) {
 343                 sun4i_drv_traverse_endpoints(list, node, 3);
 344                 sun4i_drv_traverse_endpoints(list, node, 5);
 345         }
 346
 347         return count;
 348 }
 349
 350 static int sun4i_drv_probe(struct platform_device *pdev)
 351 {
 352         struct component_match *match = NULL;
 353         struct device_node *np = pdev->dev.of_node, *endpoint;
 354         struct endpoint_list list;
 355         int i, ret, count = 0;
 356
 357         INIT_KFIFO(list.fifo);
 358
 359         for (i = 0;; i++) {
 360                 struct device_node *pipeline = of_parse_phandle(np,
 361                                                                 "allwinner,pipelines",
 362                                                                 i);
 363                 if (!pipeline)
 364                         break;
 365
 366                 kfifo_put(&list.fifo, pipeline);
 367         }
 368
 369         while (kfifo_get(&list.fifo, &endpoint)) {
 370                 /* process this endpoint */
 371                 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
 372                                               endpoint);
 373
 374                 /* sun4i_drv_add_endpoints can fail to allocate memory */
 375                 if (ret < 0)
 376                         return ret;
 377
 378                 count += ret;
 379         }
 380
 381         if (count)
 382                 return component_master_add_with_match(&pdev->dev,
 383                                                        &sun4i_drv_master_ops,
 384                                                        match);
 385         else
 386                 return 0;
 387 }
 388
 389 static int sun4i_drv_remove(struct platform_device *pdev)
 390 {
 391         component_master_del(&pdev->dev, &sun4i_drv_master_ops);
 392
 393         return 0;
 394 }
 395
 396 static const struct of_device_id sun4i_drv_of_table[] = {
 397         { .compatible = "allwinner,sun4i-a10-display-engine" },
 398         { .compatible = "allwinner,sun5i-a10s-display-engine" },
 399         { .compatible = "allwinner,sun5i-a13-display-engine" },
 400         { .compatible = "allwinner,sun6i-a31-display-engine" },
 401         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 402         { .compatible = "allwinner,sun7i-a20-display-engine" },
 403         { .compatible = "allwinner,sun8i-a23-display-engine" },
 404         { .compatible = "allwinner,sun8i-a33-display-engine" },
 405         { .compatible = "allwinner,sun8i-a83t-display-engine" },
 406         { .compatible = "allwinner,sun8i-h3-display-engine" },
 407         { .compatible = "allwinner,sun8i-r40-display-engine" },
 408         { .compatible = "allwinner,sun8i-v3s-display-engine" },
 409         { .compatible = "allwinner,sun9i-a80-display-engine" },
 410         { .compatible = "allwinner,sun50i-a64-display-engine" },
 411         { .compatible = "allwinner,sun50i-h6-display-engine" },
 412         { }
 413 };
 414 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 415
 416 static struct platform_driver sun4i_drv_platform_driver = {
 417         .probe          = sun4i_drv_probe,
 418         .remove         = sun4i_drv_remove,
 419         .driver         = {
 420                 .name           = "sun4i-drm",
 421                 .of_match_table = sun4i_drv_of_table,
 422         },
 423 };
 424 module_platform_driver(sun4i_drv_platform_driver);
 425
 426 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 427 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 428 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 429 MODULE_LICENSE("GPL");