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_framebuffer.h"
  27 #include "sun4i_tcon.h"
  28
  29 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
  30
  31 static struct drm_driver sun4i_drv_driver = {
  32         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
  33
  34         /* Generic Operations */
  35         .lastclose              = drm_fb_helper_lastclose,
  36         .fops                   = &sun4i_drv_fops,
  37         .name                   = "sun4i-drm",
  38         .desc                   = "Allwinner sun4i Display Engine",
  39         .date                   = "20150629",
  40         .major                  = 1,
  41         .minor                  = 0,
  42
  43         /* GEM Operations */
  44         .dumb_create            = drm_gem_cma_dumb_create,
  45         .gem_free_object_unlocked = drm_gem_cma_free_object,
  46         .gem_vm_ops             = &drm_gem_cma_vm_ops,
  47
  48         /* PRIME Operations */
  49         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  50         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  51         .gem_prime_import       = drm_gem_prime_import,
  52         .gem_prime_export       = drm_gem_prime_export,
  53         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  54         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  55         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
  56         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
  57         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
  58
  59         /* Frame Buffer Operations */
  60 };
  61
  62 static void sun4i_remove_framebuffers(void)
  63 {
  64         struct apertures_struct *ap;
  65
  66         ap = alloc_apertures(1);
  67         if (!ap)
  68                 return;
  69
  70         /* The framebuffer can be located anywhere in RAM */
  71         ap->ranges[0].base = 0;
  72         ap->ranges[0].size = ~0;
  73
  74         drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
  75         kfree(ap);
  76 }
  77
  78 static int sun4i_drv_bind(struct device *dev)
  79 {
  80         struct drm_device *drm;
  81         struct sun4i_drv *drv;
  82         int ret;
  83
  84         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
  85         if (IS_ERR(drm))
  86                 return PTR_ERR(drm);
  87
  88         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
  89         if (!drv) {
  90                 ret = -ENOMEM;
  91                 goto free_drm;
  92         }
  93         drm->dev_private = drv;
  94         INIT_LIST_HEAD(&drv->engine_list);
  95         INIT_LIST_HEAD(&drv->tcon_list);
  96
  97         ret = of_reserved_mem_device_init(dev);
  98         if (ret && ret != -ENODEV) {
  99                 dev_err(drm->dev, "Couldn't claim our memory region\n");
 100                 goto free_drm;
 101         }
 102
 103         drm_mode_config_init(drm);
 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         sun4i_remove_framebuffers();
 120
 121         /* Create our framebuffer */
 122         ret = sun4i_framebuffer_init(drm);
 123         if (ret) {
 124                 dev_err(drm->dev, "Couldn't create our framebuffer\n");
 125                 goto cleanup_mode_config;
 126         }
 127
 128         /* Enable connectors polling */
 129         drm_kms_helper_poll_init(drm);
 130
 131         ret = drm_dev_register(drm, 0);
 132         if (ret)
 133                 goto finish_poll;
 134
 135         return 0;
 136
 137 finish_poll:
 138         drm_kms_helper_poll_fini(drm);
 139         sun4i_framebuffer_free(drm);
 140 cleanup_mode_config:
 141         drm_mode_config_cleanup(drm);
 142         of_reserved_mem_device_release(dev);
 143 free_drm:
 144         drm_dev_unref(drm);
 145         return ret;
 146 }
 147
 148 static void sun4i_drv_unbind(struct device *dev)
 149 {
 150         struct drm_device *drm = dev_get_drvdata(dev);
 151
 152         drm_dev_unregister(drm);
 153         drm_kms_helper_poll_fini(drm);
 154         sun4i_framebuffer_free(drm);
 155         drm_mode_config_cleanup(drm);
 156         of_reserved_mem_device_release(dev);
 157         drm_dev_unref(drm);
 158 }
 159
 160 static const struct component_master_ops sun4i_drv_master_ops = {
 161         .bind   = sun4i_drv_bind,
 162         .unbind = sun4i_drv_unbind,
 163 };
 164
 165 static bool sun4i_drv_node_is_connector(struct device_node *node)
 166 {
 167         return of_device_is_compatible(node, "hdmi-connector");
 168 }
 169
 170 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 171 {
 172         return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
 173                 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 174                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 175                 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
 176                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
 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 int compare_of(struct device *dev, void *data)
 185 {
 186         DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
 187                          dev->of_node,
 188                          data);
 189
 190         return dev->of_node == data;
 191 }
 192
 193 /*
 194  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 195  * crtcs from the device tree using of_graph. For the results to be
 196  * correct, encoders must be probed/bound after _all_ crtcs have been
 197  * created. The existing code uses a depth first recursive traversal
 198  * of the of_graph, which means the encoders downstream of the TCON
 199  * get add right after the first TCON. The second TCON or CRTC will
 200  * never be properly associated with encoders connected to it.
 201  *
 202  * Also, in a dual display pipeline setup, both frontends can feed
 203  * either backend, and both backends can feed either TCON, we want
 204  * all components of the same type to be added before the next type
 205  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 206  * i.e. components of the same type are at the same depth when counted
 207  * from the frontend. The only exception is the third pipeline in
 208  * the A80 SoC, which we do not support anyway.
 209  *
 210  * Hence we can use a breadth first search traversal order to add
 211  * components. We do not need to check for duplicates. The component
 212  * matching system handles this for us.
 213  */
 214 struct endpoint_list {
 215         DECLARE_KFIFO(fifo, struct device_node *, 16);
 216 };
 217
 218 static int sun4i_drv_add_endpoints(struct device *dev,
 219                                    struct endpoint_list *list,
 220                                    struct component_match **match,
 221                                    struct device_node *node)
 222 {
 223         struct device_node *port, *ep, *remote;
 224         int count = 0;
 225
 226         /*
 227          * We don't support the frontend for now, so we will never
 228          * have a device bound. Just skip over it, but we still want
 229          * the rest our pipeline to be added.
 230          */
 231         if (!sun4i_drv_node_is_frontend(node) &&
 232             !of_device_is_available(node))
 233                 return 0;
 234
 235         /*
 236          * The connectors will be the last nodes in our pipeline, we
 237          * can just bail out.
 238          */
 239         if (sun4i_drv_node_is_connector(node))
 240                 return 0;
 241
 242         if (!sun4i_drv_node_is_frontend(node)) {
 243                 /* Add current component */
 244                 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
 245                 drm_of_component_match_add(dev, match, compare_of, node);
 246                 count++;
 247         }
 248
 249         /* Inputs are listed first, then outputs */
 250         port = of_graph_get_port_by_id(node, 1);
 251         if (!port) {
 252                 DRM_DEBUG_DRIVER("No output to bind\n");
 253                 return count;
 254         }
 255
 256         for_each_available_child_of_node(port, ep) {
 257                 remote = of_graph_get_remote_port_parent(ep);
 258                 if (!remote) {
 259                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 260                         of_node_put(remote);
 261                         continue;
 262                 }
 263
 264                 /*
 265                  * If the node is our TCON, the first port is used for
 266                  * panel or bridges, and will not be part of the
 267                  * component framework.
 268                  */
 269                 if (sun4i_drv_node_is_tcon(node)) {
 270                         struct of_endpoint endpoint;
 271
 272                         if (of_graph_parse_endpoint(ep, &endpoint)) {
 273                                 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 274                                 continue;
 275                         }
 276
 277                         if (!endpoint.id) {
 278                                 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 279                                 continue;
 280                         }
 281                 }
 282
 283                 kfifo_put(&list->fifo, remote);
 284         }
 285
 286         return count;
 287 }
 288
 289 static int sun4i_drv_probe(struct platform_device *pdev)
 290 {
 291         struct component_match *match = NULL;
 292         struct device_node *np = pdev->dev.of_node, *endpoint;
 293         struct endpoint_list list;
 294         int i, ret, count = 0;
 295
 296         INIT_KFIFO(list.fifo);
 297
 298         for (i = 0;; i++) {
 299                 struct device_node *pipeline = of_parse_phandle(np,
 300                                                                 "allwinner,pipelines",
 301                                                                 i);
 302                 if (!pipeline)
 303                         break;
 304
 305                 kfifo_put(&list.fifo, pipeline);
 306         }
 307
 308         while (kfifo_get(&list.fifo, &endpoint)) {
 309                 /* process this endpoint */
 310                 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
 311                                               endpoint);
 312
 313                 /* sun4i_drv_add_endpoints can fail to allocate memory */
 314                 if (ret < 0)
 315                         return ret;
 316
 317                 count += ret;
 318         }
 319
 320         if (count)
 321                 return component_master_add_with_match(&pdev->dev,
 322                                                        &sun4i_drv_master_ops,
 323                                                        match);
 324         else
 325                 return 0;
 326 }
 327
 328 static int sun4i_drv_remove(struct platform_device *pdev)
 329 {
 330         return 0;
 331 }
 332
 333 static const struct of_device_id sun4i_drv_of_table[] = {
 334         { .compatible = "allwinner,sun4i-a10-display-engine" },
 335         { .compatible = "allwinner,sun5i-a10s-display-engine" },
 336         { .compatible = "allwinner,sun5i-a13-display-engine" },
 337         { .compatible = "allwinner,sun6i-a31-display-engine" },
 338         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 339         { .compatible = "allwinner,sun7i-a20-display-engine" },
 340         { .compatible = "allwinner,sun8i-a33-display-engine" },
 341         { .compatible = "allwinner,sun8i-a83t-display-engine" },
 342         { .compatible = "allwinner,sun8i-v3s-display-engine" },
 343         { }
 344 };
 345 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 346
 347 static struct platform_driver sun4i_drv_platform_driver = {
 348         .probe          = sun4i_drv_probe,
 349         .remove         = sun4i_drv_remove,
 350         .driver         = {
 351                 .name           = "sun4i-drm",
 352                 .of_match_table = sun4i_drv_of_table,
 353         },
 354 };
 355 module_platform_driver(sun4i_drv_platform_driver);
 356
 357 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 358 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 359 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 360 MODULE_LICENSE("GPL");