drivers/gpu/drm/sti/sti_drv.c

   1 /*
   2  * Copyright (C) STMicroelectronics SA 2014
   3  * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
   4  * License terms:  GNU General Public License (GPL), version 2
   5  */
   6
   7 #include <drm/drmP.h>
   8
   9 #include <linux/component.h>
  10 #include <linux/debugfs.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/of_platform.h>
  14
  15 #include <drm/drm_atomic.h>
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_gem_cma_helper.h>
  19 #include <drm/drm_fb_cma_helper.h>
  20
  21 #include "sti_crtc.h"
  22 #include "sti_drv.h"
  23 #include "sti_plane.h"
  24
  25 #define DRIVER_NAME     "sti"
  26 #define DRIVER_DESC     "STMicroelectronics SoC DRM"
  27 #define DRIVER_DATE     "20140601"
  28 #define DRIVER_MAJOR    1
  29 #define DRIVER_MINOR    0
  30
  31 #define STI_MAX_FB_HEIGHT       4096
  32 #define STI_MAX_FB_WIDTH        4096
  33
  34 static int sti_drm_fps_get(void *data, u64 *val)
  35 {
  36         struct drm_device *drm_dev = data;
  37         struct drm_plane *p;
  38         unsigned int i = 0;
  39
  40         *val = 0;
  41         list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
  42                 struct sti_plane *plane = to_sti_plane(p);
  43
  44                 *val |= plane->fps_info.output << i;
  45                 i++;
  46         }
  47
  48         return 0;
  49 }
  50
  51 static int sti_drm_fps_set(void *data, u64 val)
  52 {
  53         struct drm_device *drm_dev = data;
  54         struct drm_plane *p;
  55         unsigned int i = 0;
  56
  57         list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
  58                 struct sti_plane *plane = to_sti_plane(p);
  59
  60                 plane->fps_info.output = (val >> i) & 1;
  61                 i++;
  62         }
  63
  64         return 0;
  65 }
  66
  67 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
  68                         sti_drm_fps_get, sti_drm_fps_set, "%llu\n");
  69
  70 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data)
  71 {
  72         struct drm_info_node *node = s->private;
  73         struct drm_device *dev = node->minor->dev;
  74         struct drm_plane *p;
  75
  76         list_for_each_entry(p, &dev->mode_config.plane_list, head) {
  77                 struct sti_plane *plane = to_sti_plane(p);
  78
  79                 seq_printf(s, "%s%s\n",
  80                            plane->fps_info.fps_str,
  81                            plane->fps_info.fips_str);
  82         }
  83
  84         return 0;
  85 }
  86
  87 static struct drm_info_list sti_drm_dbg_list[] = {
  88         {"fps_get", sti_drm_fps_dbg_show, 0},
  89 };
  90
  91 static int sti_drm_debugfs_create(struct dentry *root,
  92                                   struct drm_minor *minor,
  93                                   const char *name,
  94                                   const struct file_operations *fops)
  95 {
  96         struct drm_device *dev = minor->dev;
  97         struct drm_info_node *node;
  98         struct dentry *ent;
  99
 100         ent = debugfs_create_file(name, S_IRUGO | S_IWUSR, root, dev, fops);
 101         if (IS_ERR(ent))
 102                 return PTR_ERR(ent);
 103
 104         node = kmalloc(sizeof(*node), GFP_KERNEL);
 105         if (!node) {
 106                 debugfs_remove(ent);
 107                 return -ENOMEM;
 108         }
 109
 110         node->minor = minor;
 111         node->dent = ent;
 112         node->info_ent = (void *)fops;
 113
 114         mutex_lock(&minor->debugfs_lock);
 115         list_add(&node->list, &minor->debugfs_list);
 116         mutex_unlock(&minor->debugfs_lock);
 117
 118         return 0;
 119 }
 120
 121 static int sti_drm_dbg_init(struct drm_minor *minor)
 122 {
 123         int ret;
 124
 125         ret = drm_debugfs_create_files(sti_drm_dbg_list,
 126                                        ARRAY_SIZE(sti_drm_dbg_list),
 127                                        minor->debugfs_root, minor);
 128         if (ret)
 129                 goto err;
 130
 131         ret = sti_drm_debugfs_create(minor->debugfs_root, minor, "fps_show",
 132                                      &sti_drm_fps_fops);
 133         if (ret)
 134                 goto err;
 135
 136         DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
 137         return 0;
 138 err:
 139         DRM_ERROR("%s: cannot install debugfs\n", DRIVER_NAME);
 140         return ret;
 141 }
 142
 143 void sti_drm_dbg_cleanup(struct drm_minor *minor)
 144 {
 145         drm_debugfs_remove_files(sti_drm_dbg_list,
 146                                  ARRAY_SIZE(sti_drm_dbg_list), minor);
 147
 148         drm_debugfs_remove_files((struct drm_info_list *)&sti_drm_fps_fops,
 149                                  1, minor);
 150 }
 151
 152 static void sti_atomic_schedule(struct sti_private *private,
 153                                 struct drm_atomic_state *state)
 154 {
 155         private->commit.state = state;
 156         schedule_work(&private->commit.work);
 157 }
 158
 159 static void sti_atomic_complete(struct sti_private *private,
 160                                 struct drm_atomic_state *state)
 161 {
 162         struct drm_device *drm = private->drm_dev;
 163
 164         /*
 165          * Everything below can be run asynchronously without the need to grab
 166          * any modeset locks at all under one condition: It must be guaranteed
 167          * that the asynchronous work has either been cancelled (if the driver
 168          * supports it, which at least requires that the framebuffers get
 169          * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
 170          * before the new state gets committed on the software side with
 171          * drm_atomic_helper_swap_state().
 172          *
 173          * This scheme allows new atomic state updates to be prepared and
 174          * checked in parallel to the asynchronous completion of the previous
 175          * update. Which is important since compositors need to figure out the
 176          * composition of the next frame right after having submitted the
 177          * current layout.
 178          */
 179
 180         drm_atomic_helper_commit_modeset_disables(drm, state);
 181         drm_atomic_helper_commit_planes(drm, state, false);
 182         drm_atomic_helper_commit_modeset_enables(drm, state);
 183
 184         drm_atomic_helper_wait_for_vblanks(drm, state);
 185
 186         drm_atomic_helper_cleanup_planes(drm, state);
 187         drm_atomic_state_free(state);
 188 }
 189
 190 static void sti_atomic_work(struct work_struct *work)
 191 {
 192         struct sti_private *private = container_of(work,
 193                         struct sti_private, commit.work);
 194
 195         sti_atomic_complete(private, private->commit.state);
 196 }
 197
 198 static int sti_atomic_commit(struct drm_device *drm,
 199                              struct drm_atomic_state *state, bool nonblock)
 200 {
 201         struct sti_private *private = drm->dev_private;
 202         int err;
 203
 204         err = drm_atomic_helper_prepare_planes(drm, state);
 205         if (err)
 206                 return err;
 207
 208         /* serialize outstanding nonblocking commits */
 209         mutex_lock(&private->commit.lock);
 210         flush_work(&private->commit.work);
 211
 212         /*
 213          * This is the point of no return - everything below never fails except
 214          * when the hw goes bonghits. Which means we can commit the new state on
 215          * the software side now.
 216          */
 217
 218         drm_atomic_helper_swap_state(state, true);
 219
 220         if (nonblock)
 221                 sti_atomic_schedule(private, state);
 222         else
 223                 sti_atomic_complete(private, state);
 224
 225         mutex_unlock(&private->commit.lock);
 226         return 0;
 227 }
 228
 229 static void sti_output_poll_changed(struct drm_device *ddev)
 230 {
 231         struct sti_private *private = ddev->dev_private;
 232
 233         if (!ddev->mode_config.num_connector)
 234                 return;
 235
 236         if (private->fbdev) {
 237                 drm_fbdev_cma_hotplug_event(private->fbdev);
 238                 return;
 239         }
 240
 241         private->fbdev = drm_fbdev_cma_init(ddev, 32,
 242                                             ddev->mode_config.num_crtc,
 243                                             ddev->mode_config.num_connector);
 244         if (IS_ERR(private->fbdev))
 245                 private->fbdev = NULL;
 246 }
 247
 248 static const struct drm_mode_config_funcs sti_mode_config_funcs = {
 249         .fb_create = drm_fb_cma_create,
 250         .output_poll_changed = sti_output_poll_changed,
 251         .atomic_check = drm_atomic_helper_check,
 252         .atomic_commit = sti_atomic_commit,
 253 };
 254
 255 static void sti_mode_config_init(struct drm_device *dev)
 256 {
 257         dev->mode_config.min_width = 0;
 258         dev->mode_config.min_height = 0;
 259
 260         /*
 261          * set max width and height as default value.
 262          * this value would be used to check framebuffer size limitation
 263          * at drm_mode_addfb().
 264          */
 265         dev->mode_config.max_width = STI_MAX_FB_WIDTH;
 266         dev->mode_config.max_height = STI_MAX_FB_HEIGHT;
 267
 268         dev->mode_config.funcs = &sti_mode_config_funcs;
 269 }
 270
 271 static const struct file_operations sti_driver_fops = {
 272         .owner = THIS_MODULE,
 273         .open = drm_open,
 274         .mmap = drm_gem_cma_mmap,
 275         .poll = drm_poll,
 276         .read = drm_read,
 277         .unlocked_ioctl = drm_ioctl,
 278 #ifdef CONFIG_COMPAT
 279         .compat_ioctl = drm_compat_ioctl,
 280 #endif
 281         .release = drm_release,
 282 };
 283
 284 static struct drm_driver sti_driver = {
 285         .driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET |
 286             DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
 287         .gem_free_object_unlocked = drm_gem_cma_free_object,
 288         .gem_vm_ops = &drm_gem_cma_vm_ops,
 289         .dumb_create = drm_gem_cma_dumb_create,
 290         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 291         .dumb_destroy = drm_gem_dumb_destroy,
 292         .fops = &sti_driver_fops,
 293
 294         .get_vblank_counter = drm_vblank_no_hw_counter,
 295         .enable_vblank = sti_crtc_enable_vblank,
 296         .disable_vblank = sti_crtc_disable_vblank,
 297
 298         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 299         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 300         .gem_prime_export = drm_gem_prime_export,
 301         .gem_prime_import = drm_gem_prime_import,
 302         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 303         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 304         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 305         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 306         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 307
 308         .debugfs_init = sti_drm_dbg_init,
 309         .debugfs_cleanup = sti_drm_dbg_cleanup,
 310
 311         .name = DRIVER_NAME,
 312         .desc = DRIVER_DESC,
 313         .date = DRIVER_DATE,
 314         .major = DRIVER_MAJOR,
 315         .minor = DRIVER_MINOR,
 316 };
 317
 318 static int compare_of(struct device *dev, void *data)
 319 {
 320         return dev->of_node == data;
 321 }
 322
 323 static int sti_init(struct drm_device *ddev)
 324 {
 325         struct sti_private *private;
 326
 327         private = kzalloc(sizeof(*private), GFP_KERNEL);
 328         if (!private)
 329                 return -ENOMEM;
 330
 331         ddev->dev_private = (void *)private;
 332         dev_set_drvdata(ddev->dev, ddev);
 333         private->drm_dev = ddev;
 334
 335         mutex_init(&private->commit.lock);
 336         INIT_WORK(&private->commit.work, sti_atomic_work);
 337
 338         drm_mode_config_init(ddev);
 339
 340         sti_mode_config_init(ddev);
 341
 342         drm_kms_helper_poll_init(ddev);
 343
 344         return 0;
 345 }
 346
 347 static void sti_cleanup(struct drm_device *ddev)
 348 {
 349         struct sti_private *private = ddev->dev_private;
 350
 351         if (private->fbdev) {
 352                 drm_fbdev_cma_fini(private->fbdev);
 353                 private->fbdev = NULL;
 354         }
 355
 356         drm_kms_helper_poll_fini(ddev);
 357         drm_vblank_cleanup(ddev);
 358         kfree(private);
 359         ddev->dev_private = NULL;
 360 }
 361
 362 static int sti_bind(struct device *dev)
 363 {
 364         struct drm_device *ddev;
 365         int ret;
 366
 367         ddev = drm_dev_alloc(&sti_driver, dev);
 368         if (!ddev)
 369                 return -ENOMEM;
 370
 371         ddev->platformdev = to_platform_device(dev);
 372
 373         ret = sti_init(ddev);
 374         if (ret)
 375                 goto err_drm_dev_unref;
 376
 377         ret = component_bind_all(ddev->dev, ddev);
 378         if (ret)
 379                 goto err_cleanup;
 380
 381         ret = drm_dev_register(ddev, 0);
 382         if (ret)
 383                 goto err_register;
 384
 385         drm_mode_config_reset(ddev);
 386
 387         return 0;
 388
 389 err_register:
 390         drm_mode_config_cleanup(ddev);
 391 err_cleanup:
 392         sti_cleanup(ddev);
 393 err_drm_dev_unref:
 394         drm_dev_unref(ddev);
 395         return ret;
 396 }
 397
 398 static void sti_unbind(struct device *dev)
 399 {
 400         struct drm_device *ddev = dev_get_drvdata(dev);
 401
 402         drm_dev_unregister(ddev);
 403         sti_cleanup(ddev);
 404         drm_dev_unref(ddev);
 405 }
 406
 407 static const struct component_master_ops sti_ops = {
 408         .bind = sti_bind,
 409         .unbind = sti_unbind,
 410 };
 411
 412 static int sti_platform_probe(struct platform_device *pdev)
 413 {
 414         struct device *dev = &pdev->dev;
 415         struct device_node *node = dev->of_node;
 416         struct device_node *child_np;
 417         struct component_match *match = NULL;
 418
 419         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 420
 421         of_platform_populate(node, NULL, NULL, dev);
 422
 423         child_np = of_get_next_available_child(node, NULL);
 424
 425         while (child_np) {
 426                 component_match_add(dev, &match, compare_of, child_np);
 427                 of_node_put(child_np);
 428                 child_np = of_get_next_available_child(node, child_np);
 429         }
 430
 431         return component_master_add_with_match(dev, &sti_ops, match);
 432 }
 433
 434 static int sti_platform_remove(struct platform_device *pdev)
 435 {
 436         component_master_del(&pdev->dev, &sti_ops);
 437         of_platform_depopulate(&pdev->dev);
 438
 439         return 0;
 440 }
 441
 442 static const struct of_device_id sti_dt_ids[] = {
 443         { .compatible = "st,sti-display-subsystem", },
 444         { /* end node */ },
 445 };
 446 MODULE_DEVICE_TABLE(of, sti_dt_ids);
 447
 448 static struct platform_driver sti_platform_driver = {
 449         .probe = sti_platform_probe,
 450         .remove = sti_platform_remove,
 451         .driver = {
 452                 .name = DRIVER_NAME,
 453                 .of_match_table = sti_dt_ids,
 454         },
 455 };
 456
 457 static struct platform_driver * const drivers[] = {
 458         &sti_tvout_driver,
 459         &sti_vtac_driver,
 460         &sti_hqvdp_driver,
 461         &sti_hdmi_driver,
 462         &sti_hda_driver,
 463         &sti_dvo_driver,
 464         &sti_vtg_driver,
 465         &sti_compositor_driver,
 466         &sti_platform_driver,
 467 };
 468
 469 static int sti_drm_init(void)
 470 {
 471         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 472 }
 473 module_init(sti_drm_init);
 474
 475 static void sti_drm_exit(void)
 476 {
 477         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 478 }
 479 module_exit(sti_drm_exit);
 480
 481 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
 482 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 483 MODULE_LICENSE("GPL");