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_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
  30 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
  31
  32 static struct drm_driver sun4i_drv_driver = {
  33         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
  34
  35         /* Generic Operations */
  36         .lastclose              = drm_fb_helper_lastclose,
  37         .fops                   = &sun4i_drv_fops,
  38         .name                   = "sun4i-drm",
  39         .desc                   = "Allwinner sun4i Display Engine",
  40         .date                   = "20150629",
  41         .major                  = 1,
  42         .minor                  = 0,
  43
  44         /* GEM Operations */
  45         .dumb_create            = drm_gem_cma_dumb_create,
  46         .gem_free_object_unlocked = drm_gem_cma_free_object,
  47         .gem_vm_ops             = &drm_gem_cma_vm_ops,
  48
  49         /* PRIME Operations */
  50         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  51         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  52         .gem_prime_import       = drm_gem_prime_import,
  53         .gem_prime_export       = drm_gem_prime_export,
  54         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  55         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  56         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
  57         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
  58         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
  59
  60         /* Frame Buffer Operations */
  61 };
  62
  63 static void sun4i_remove_framebuffers(void)
  64 {
  65         struct apertures_struct *ap;
  66
  67         ap = alloc_apertures(1);
  68         if (!ap)
  69                 return;
  70
  71         /* The framebuffer can be located anywhere in RAM */
  72         ap->ranges[0].base = 0;
  73         ap->ranges[0].size = ~0;
  74
  75         drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
  76         kfree(ap);
  77 }
  78
  79 static int sun4i_drv_bind(struct device *dev)
  80 {
  81         struct drm_device *drm;
  82         struct sun4i_drv *drv;
  83         int ret;
  84
  85         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
  86         if (IS_ERR(drm))
  87                 return PTR_ERR(drm);
  88
  89         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
  90         if (!drv) {
  91                 ret = -ENOMEM;
  92                 goto free_drm;
  93         }
  94         drm->dev_private = drv;
  95         INIT_LIST_HEAD(&drv->frontend_list);
  96         INIT_LIST_HEAD(&drv->engine_list);
  97         INIT_LIST_HEAD(&drv->tcon_list);
  98
  99         ret = of_reserved_mem_device_init(dev);
 100         if (ret && ret != -ENODEV) {
 101                 dev_err(drm->dev, "Couldn't claim our memory region\n");
 102                 goto free_drm;
 103         }
 104
 105         drm_mode_config_init(drm);
 106
 107         ret = component_bind_all(drm->dev, drm);
 108         if (ret) {
 109                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
 110                 goto cleanup_mode_config;
 111         }
 112
 113         /* drm_vblank_init calls kcalloc, which can fail */
 114         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 115         if (ret)
 116                 goto cleanup_mode_config;
 117
 118         drm->irq_enabled = true;
 119
 120         /* Remove early framebuffers (ie. simplefb) */
 121         sun4i_remove_framebuffers();
 122
 123         /* Create our framebuffer */
 124         ret = sun4i_framebuffer_init(drm);
 125         if (ret) {
 126                 dev_err(drm->dev, "Couldn't create our framebuffer\n");
 127                 goto cleanup_mode_config;
 128         }
 129
 130         /* Enable connectors polling */
 131         drm_kms_helper_poll_init(drm);
 132
 133         ret = drm_dev_register(drm, 0);
 134         if (ret)
 135                 goto finish_poll;
 136
 137         return 0;
 138
 139 finish_poll:
 140         drm_kms_helper_poll_fini(drm);
 141         sun4i_framebuffer_free(drm);
 142 cleanup_mode_config:
 143         drm_mode_config_cleanup(drm);
 144         of_reserved_mem_device_release(dev);
 145 free_drm:
 146         drm_dev_unref(drm);
 147         return ret;
 148 }
 149
 150 static void sun4i_drv_unbind(struct device *dev)
 151 {
 152         struct drm_device *drm = dev_get_drvdata(dev);
 153
 154         drm_dev_unregister(drm);
 155         drm_kms_helper_poll_fini(drm);
 156         sun4i_framebuffer_free(drm);
 157         drm_mode_config_cleanup(drm);
 158         of_reserved_mem_device_release(dev);
 159         drm_dev_unref(drm);
 160 }
 161
 162 static const struct component_master_ops sun4i_drv_master_ops = {
 163         .bind   = sun4i_drv_bind,
 164         .unbind = sun4i_drv_unbind,
 165 };
 166
 167 static bool sun4i_drv_node_is_connector(struct device_node *node)
 168 {
 169         return of_device_is_compatible(node, "hdmi-connector");
 170 }
 171
 172 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 173 {
 174         return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
 175                 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 176                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 177                 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
 178                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
 179                 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
 180 }
 181
 182 static bool sun4i_drv_node_is_deu(struct device_node *node)
 183 {
 184         return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
 185 }
 186
 187 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
 188 {
 189         if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
 190                 return !!of_match_node(sun4i_frontend_of_table, node);
 191
 192         return false;
 193 }
 194
 195 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 196 {
 197         return !!of_match_node(sun4i_tcon_of_table, node);
 198 }
 199
 200 static int compare_of(struct device *dev, void *data)
 201 {
 202         DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
 203                          dev->of_node,
 204                          data);
 205
 206         return dev->of_node == data;
 207 }
 208
 209 /*
 210  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 211  * crtcs from the device tree using of_graph. For the results to be
 212  * correct, encoders must be probed/bound after _all_ crtcs have been
 213  * created. The existing code uses a depth first recursive traversal
 214  * of the of_graph, which means the encoders downstream of the TCON
 215  * get add right after the first TCON. The second TCON or CRTC will
 216  * never be properly associated with encoders connected to it.
 217  *
 218  * Also, in a dual display pipeline setup, both frontends can feed
 219  * either backend, and both backends can feed either TCON, we want
 220  * all components of the same type to be added before the next type
 221  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 222  * i.e. components of the same type are at the same depth when counted
 223  * from the frontend. The only exception is the third pipeline in
 224  * the A80 SoC, which we do not support anyway.
 225  *
 226  * Hence we can use a breadth first search traversal order to add
 227  * components. We do not need to check for duplicates. The component
 228  * matching system handles this for us.
 229  */
 230 struct endpoint_list {
 231         DECLARE_KFIFO(fifo, struct device_node *, 16);
 232 };
 233
 234 static int sun4i_drv_add_endpoints(struct device *dev,
 235                                    struct endpoint_list *list,
 236                                    struct component_match **match,
 237                                    struct device_node *node)
 238 {
 239         struct device_node *port, *ep, *remote;
 240         int count = 0;
 241
 242         /*
 243          * The frontend has been disabled in some of our old device
 244          * trees. If we find a node that is the frontend and is
 245          * disabled, we should just follow through and parse its
 246          * child, but without adding it to the component list.
 247          * Otherwise, we obviously want to add it to the list.
 248          */
 249         if (!sun4i_drv_node_is_frontend(node) &&
 250             !of_device_is_available(node))
 251                 return 0;
 252
 253         /*
 254          * The connectors will be the last nodes in our pipeline, we
 255          * can just bail out.
 256          */
 257         if (sun4i_drv_node_is_connector(node))
 258                 return 0;
 259
 260         /*
 261          * If the device is either just a regular device, or an
 262          * enabled frontend supported by the driver, we add it to our
 263          * component list.
 264          */
 265         if (!(sun4i_drv_node_is_frontend(node) ||
 266               sun4i_drv_node_is_deu(node)) ||
 267             (sun4i_drv_node_is_supported_frontend(node) &&
 268              of_device_is_available(node))) {
 269                 /* Add current component */
 270                 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
 271                 drm_of_component_match_add(dev, match, compare_of, node);
 272                 count++;
 273         }
 274
 275         /* Inputs are listed first, then outputs */
 276         port = of_graph_get_port_by_id(node, 1);
 277         if (!port) {
 278                 DRM_DEBUG_DRIVER("No output to bind\n");
 279                 return count;
 280         }
 281
 282         for_each_available_child_of_node(port, ep) {
 283                 remote = of_graph_get_remote_port_parent(ep);
 284                 if (!remote) {
 285                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 286                         of_node_put(remote);
 287                         continue;
 288                 }
 289
 290                 /*
 291                  * If the node is our TCON, the first port is used for
 292                  * panel or bridges, and will not be part of the
 293                  * component framework.
 294                  */
 295                 if (sun4i_drv_node_is_tcon(node)) {
 296                         struct of_endpoint endpoint;
 297
 298                         if (of_graph_parse_endpoint(ep, &endpoint)) {
 299                                 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 300                                 continue;
 301                         }
 302
 303                         if (!endpoint.id) {
 304                                 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 305                                 continue;
 306                         }
 307                 }
 308
 309                 kfifo_put(&list->fifo, remote);
 310         }
 311
 312         return count;
 313 }
 314
 315 static int sun4i_drv_probe(struct platform_device *pdev)
 316 {
 317         struct component_match *match = NULL;
 318         struct device_node *np = pdev->dev.of_node, *endpoint;
 319         struct endpoint_list list;
 320         int i, ret, count = 0;
 321
 322         INIT_KFIFO(list.fifo);
 323
 324         for (i = 0;; i++) {
 325                 struct device_node *pipeline = of_parse_phandle(np,
 326                                                                 "allwinner,pipelines",
 327                                                                 i);
 328                 if (!pipeline)
 329                         break;
 330
 331                 kfifo_put(&list.fifo, pipeline);
 332         }
 333
 334         while (kfifo_get(&list.fifo, &endpoint)) {
 335                 /* process this endpoint */
 336                 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
 337                                               endpoint);
 338
 339                 /* sun4i_drv_add_endpoints can fail to allocate memory */
 340                 if (ret < 0)
 341                         return ret;
 342
 343                 count += ret;
 344         }
 345
 346         if (count)
 347                 return component_master_add_with_match(&pdev->dev,
 348                                                        &sun4i_drv_master_ops,
 349                                                        match);
 350         else
 351                 return 0;
 352 }
 353
 354 static int sun4i_drv_remove(struct platform_device *pdev)
 355 {
 356         return 0;
 357 }
 358
 359 static const struct of_device_id sun4i_drv_of_table[] = {
 360         { .compatible = "allwinner,sun4i-a10-display-engine" },
 361         { .compatible = "allwinner,sun5i-a10s-display-engine" },
 362         { .compatible = "allwinner,sun5i-a13-display-engine" },
 363         { .compatible = "allwinner,sun6i-a31-display-engine" },
 364         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 365         { .compatible = "allwinner,sun7i-a20-display-engine" },
 366         { .compatible = "allwinner,sun8i-a33-display-engine" },
 367         { .compatible = "allwinner,sun8i-a83t-display-engine" },
 368         { .compatible = "allwinner,sun8i-h3-display-engine" },
 369         { .compatible = "allwinner,sun8i-v3s-display-engine" },
 370         { .compatible = "allwinner,sun9i-a80-display-engine" },
 371         { }
 372 };
 373 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 374
 375 static struct platform_driver sun4i_drv_platform_driver = {
 376         .probe          = sun4i_drv_probe,
 377         .remove         = sun4i_drv_remove,
 378         .driver         = {
 379                 .name           = "sun4i-drm",
 380                 .of_match_table = sun4i_drv_of_table,
 381         },
 382 };
 383 module_platform_driver(sun4i_drv_platform_driver);
 384
 385 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 386 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 387 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 388 MODULE_LICENSE("GPL");