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 #include <drm/drm_of.h>
  21
  22 #include "sti_crtc.h"
  23 #include "sti_drv.h"
  24 #include "sti_plane.h"
  25
  26 #define DRIVER_NAME     "sti"
  27 #define DRIVER_DESC     "STMicroelectronics SoC DRM"
  28 #define DRIVER_DATE     "20140601"
  29 #define DRIVER_MAJOR    1
  30 #define DRIVER_MINOR    0
  31
  32 #define STI_MAX_FB_HEIGHT       4096
  33 #define STI_MAX_FB_WIDTH        4096
  34
  35 static int sti_drm_fps_get(void *data, u64 *val)
  36 {
  37         struct drm_device *drm_dev = data;
  38         struct drm_plane *p;
  39         unsigned int i = 0;
  40
  41         *val = 0;
  42         list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
  43                 struct sti_plane *plane = to_sti_plane(p);
  44
  45                 *val |= plane->fps_info.output << i;
  46                 i++;
  47         }
  48
  49         return 0;
  50 }
  51
  52 static int sti_drm_fps_set(void *data, u64 val)
  53 {
  54         struct drm_device *drm_dev = data;
  55         struct drm_plane *p;
  56         unsigned int i = 0;
  57
  58         list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
  59                 struct sti_plane *plane = to_sti_plane(p);
  60
  61                 plane->fps_info.output = (val >> i) & 1;
  62                 i++;
  63         }
  64
  65         return 0;
  66 }
  67
  68 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
  69                         sti_drm_fps_get, sti_drm_fps_set, "%llu\n");
  70
  71 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data)
  72 {
  73         struct drm_info_node *node = s->private;
  74         struct drm_device *dev = node->minor->dev;
  75         struct drm_plane *p;
  76
  77         list_for_each_entry(p, &dev->mode_config.plane_list, head) {
  78                 struct sti_plane *plane = to_sti_plane(p);
  79
  80                 seq_printf(s, "%s%s\n",
  81                            plane->fps_info.fps_str,
  82                            plane->fps_info.fips_str);
  83         }
  84
  85         return 0;
  86 }
  87
  88 static struct drm_info_list sti_drm_dbg_list[] = {
  89         {"fps_get", sti_drm_fps_dbg_show, 0},
  90 };
  91
  92 static int sti_drm_debugfs_create(struct dentry *root,
  93                                   struct drm_minor *minor,
  94                                   const char *name,
  95                                   const struct file_operations *fops)
  96 {
  97         struct drm_device *dev = minor->dev;
  98         struct drm_info_node *node;
  99         struct dentry *ent;
 100
 101         ent = debugfs_create_file(name, S_IRUGO | S_IWUSR, root, dev, fops);
 102         if (IS_ERR(ent))
 103                 return PTR_ERR(ent);
 104
 105         node = kmalloc(sizeof(*node), GFP_KERNEL);
 106         if (!node) {
 107                 debugfs_remove(ent);
 108                 return -ENOMEM;
 109         }
 110
 111         node->minor = minor;
 112         node->dent = ent;
 113         node->info_ent = (void *)fops;
 114
 115         mutex_lock(&minor->debugfs_lock);
 116         list_add(&node->list, &minor->debugfs_list);
 117         mutex_unlock(&minor->debugfs_lock);
 118
 119         return 0;
 120 }
 121
 122 static int sti_drm_dbg_init(struct drm_minor *minor)
 123 {
 124         int ret;
 125
 126         ret = drm_debugfs_create_files(sti_drm_dbg_list,
 127                                        ARRAY_SIZE(sti_drm_dbg_list),
 128                                        minor->debugfs_root, minor);
 129         if (ret)
 130                 goto err;
 131
 132         ret = sti_drm_debugfs_create(minor->debugfs_root, minor, "fps_show",
 133                                      &sti_drm_fps_fops);
 134         if (ret)
 135                 goto err;
 136
 137         DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
 138         return 0;
 139 err:
 140         DRM_ERROR("%s: cannot install debugfs\n", DRIVER_NAME);
 141         return ret;
 142 }
 143
 144 static void sti_drm_dbg_cleanup(struct drm_minor *minor)
 145 {
 146         drm_debugfs_remove_files(sti_drm_dbg_list,
 147                                  ARRAY_SIZE(sti_drm_dbg_list), minor);
 148
 149         drm_debugfs_remove_files((struct drm_info_list *)&sti_drm_fps_fops,
 150                                  1, minor);
 151 }
 152
 153 static void sti_atomic_schedule(struct sti_private *private,
 154                                 struct drm_atomic_state *state)
 155 {
 156         private->commit.state = state;
 157         schedule_work(&private->commit.work);
 158 }
 159
 160 static void sti_atomic_complete(struct sti_private *private,
 161                                 struct drm_atomic_state *state)
 162 {
 163         struct drm_device *drm = private->drm_dev;
 164
 165         /*
 166          * Everything below can be run asynchronously without the need to grab
 167          * any modeset locks at all under one condition: It must be guaranteed
 168          * that the asynchronous work has either been cancelled (if the driver
 169          * supports it, which at least requires that the framebuffers get
 170          * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
 171          * before the new state gets committed on the software side with
 172          * drm_atomic_helper_swap_state().
 173          *
 174          * This scheme allows new atomic state updates to be prepared and
 175          * checked in parallel to the asynchronous completion of the previous
 176          * update. Which is important since compositors need to figure out the
 177          * composition of the next frame right after having submitted the
 178          * current layout.
 179          */
 180
 181         drm_atomic_helper_commit_modeset_disables(drm, state);
 182         drm_atomic_helper_commit_planes(drm, state, 0);
 183         drm_atomic_helper_commit_modeset_enables(drm, state);
 184
 185         drm_atomic_helper_wait_for_vblanks(drm, state);
 186
 187         drm_atomic_helper_cleanup_planes(drm, state);
 188         drm_atomic_state_put(state);
 189 }
 190
 191 static void sti_atomic_work(struct work_struct *work)
 192 {
 193         struct sti_private *private = container_of(work,
 194                         struct sti_private, commit.work);
 195
 196         sti_atomic_complete(private, private->commit.state);
 197 }
 198
 199 static int sti_atomic_check(struct drm_device *dev,
 200                             struct drm_atomic_state *state)
 201 {
 202         int ret;
 203
 204         ret = drm_atomic_helper_check_modeset(dev, state);
 205         if (ret)
 206                 return ret;
 207
 208         ret = drm_atomic_normalize_zpos(dev, state);
 209         if (ret)
 210                 return ret;
 211
 212         ret = drm_atomic_helper_check_planes(dev, state);
 213         if (ret)
 214                 return ret;
 215
 216         return ret;
 217 }
 218
 219 static int sti_atomic_commit(struct drm_device *drm,
 220                              struct drm_atomic_state *state, bool nonblock)
 221 {
 222         struct sti_private *private = drm->dev_private;
 223         int err;
 224
 225         err = drm_atomic_helper_prepare_planes(drm, state);
 226         if (err)
 227                 return err;
 228
 229         /* serialize outstanding nonblocking commits */
 230         mutex_lock(&private->commit.lock);
 231         flush_work(&private->commit.work);
 232
 233         /*
 234          * This is the point of no return - everything below never fails except
 235          * when the hw goes bonghits. Which means we can commit the new state on
 236          * the software side now.
 237          */
 238
 239         drm_atomic_helper_swap_state(state, true);
 240
 241         drm_atomic_state_get(state);
 242         if (nonblock)
 243                 sti_atomic_schedule(private, state);
 244         else
 245                 sti_atomic_complete(private, state);
 246
 247         mutex_unlock(&private->commit.lock);
 248         return 0;
 249 }
 250
 251 static void sti_output_poll_changed(struct drm_device *ddev)
 252 {
 253         struct sti_private *private = ddev->dev_private;
 254
 255         if (!ddev->mode_config.num_connector)
 256                 return;
 257
 258         if (private->fbdev) {
 259                 drm_fbdev_cma_hotplug_event(private->fbdev);
 260                 return;
 261         }
 262
 263         private->fbdev = drm_fbdev_cma_init(ddev, 32,
 264                                             ddev->mode_config.num_crtc,
 265                                             ddev->mode_config.num_connector);
 266         if (IS_ERR(private->fbdev))
 267                 private->fbdev = NULL;
 268 }
 269
 270 static const struct drm_mode_config_funcs sti_mode_config_funcs = {
 271         .fb_create = drm_fb_cma_create,
 272         .output_poll_changed = sti_output_poll_changed,
 273         .atomic_check = sti_atomic_check,
 274         .atomic_commit = sti_atomic_commit,
 275 };
 276
 277 static void sti_mode_config_init(struct drm_device *dev)
 278 {
 279         dev->mode_config.min_width = 0;
 280         dev->mode_config.min_height = 0;
 281
 282         /*
 283          * set max width and height as default value.
 284          * this value would be used to check framebuffer size limitation
 285          * at drm_mode_addfb().
 286          */
 287         dev->mode_config.max_width = STI_MAX_FB_WIDTH;
 288         dev->mode_config.max_height = STI_MAX_FB_HEIGHT;
 289
 290         dev->mode_config.funcs = &sti_mode_config_funcs;
 291 }
 292
 293 static const struct file_operations sti_driver_fops = {
 294         .owner = THIS_MODULE,
 295         .open = drm_open,
 296         .mmap = drm_gem_cma_mmap,
 297         .poll = drm_poll,
 298         .read = drm_read,
 299         .unlocked_ioctl = drm_ioctl,
 300         .compat_ioctl = drm_compat_ioctl,
 301         .release = drm_release,
 302 };
 303
 304 static struct drm_driver sti_driver = {
 305         .driver_features = DRIVER_MODESET |
 306             DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
 307         .gem_free_object_unlocked = drm_gem_cma_free_object,
 308         .gem_vm_ops = &drm_gem_cma_vm_ops,
 309         .dumb_create = drm_gem_cma_dumb_create,
 310         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 311         .dumb_destroy = drm_gem_dumb_destroy,
 312         .fops = &sti_driver_fops,
 313
 314         .get_vblank_counter = drm_vblank_no_hw_counter,
 315         .enable_vblank = sti_crtc_enable_vblank,
 316         .disable_vblank = sti_crtc_disable_vblank,
 317
 318         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 319         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 320         .gem_prime_export = drm_gem_prime_export,
 321         .gem_prime_import = drm_gem_prime_import,
 322         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 323         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 324         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 325         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 326         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 327
 328         .debugfs_init = sti_drm_dbg_init,
 329         .debugfs_cleanup = sti_drm_dbg_cleanup,
 330
 331         .name = DRIVER_NAME,
 332         .desc = DRIVER_DESC,
 333         .date = DRIVER_DATE,
 334         .major = DRIVER_MAJOR,
 335         .minor = DRIVER_MINOR,
 336 };
 337
 338 static int compare_of(struct device *dev, void *data)
 339 {
 340         return dev->of_node == data;
 341 }
 342
 343 static int sti_init(struct drm_device *ddev)
 344 {
 345         struct sti_private *private;
 346
 347         private = kzalloc(sizeof(*private), GFP_KERNEL);
 348         if (!private)
 349                 return -ENOMEM;
 350
 351         ddev->dev_private = (void *)private;
 352         dev_set_drvdata(ddev->dev, ddev);
 353         private->drm_dev = ddev;
 354
 355         mutex_init(&private->commit.lock);
 356         INIT_WORK(&private->commit.work, sti_atomic_work);
 357
 358         drm_mode_config_init(ddev);
 359
 360         sti_mode_config_init(ddev);
 361
 362         drm_kms_helper_poll_init(ddev);
 363
 364         return 0;
 365 }
 366
 367 static void sti_cleanup(struct drm_device *ddev)
 368 {
 369         struct sti_private *private = ddev->dev_private;
 370
 371         if (private->fbdev) {
 372                 drm_fbdev_cma_fini(private->fbdev);
 373                 private->fbdev = NULL;
 374         }
 375
 376         drm_kms_helper_poll_fini(ddev);
 377         drm_vblank_cleanup(ddev);
 378         kfree(private);
 379         ddev->dev_private = NULL;
 380 }
 381
 382 static int sti_bind(struct device *dev)
 383 {
 384         struct drm_device *ddev;
 385         int ret;
 386
 387         ddev = drm_dev_alloc(&sti_driver, dev);
 388         if (IS_ERR(ddev))
 389                 return PTR_ERR(ddev);
 390
 391         ddev->platformdev = to_platform_device(dev);
 392
 393         ret = sti_init(ddev);
 394         if (ret)
 395                 goto err_drm_dev_unref;
 396
 397         ret = component_bind_all(ddev->dev, ddev);
 398         if (ret)
 399                 goto err_cleanup;
 400
 401         ret = drm_dev_register(ddev, 0);
 402         if (ret)
 403                 goto err_register;
 404
 405         drm_mode_config_reset(ddev);
 406
 407         return 0;
 408
 409 err_register:
 410         drm_mode_config_cleanup(ddev);
 411 err_cleanup:
 412         sti_cleanup(ddev);
 413 err_drm_dev_unref:
 414         drm_dev_unref(ddev);
 415         return ret;
 416 }
 417
 418 static void sti_unbind(struct device *dev)
 419 {
 420         struct drm_device *ddev = dev_get_drvdata(dev);
 421
 422         drm_dev_unregister(ddev);
 423         sti_cleanup(ddev);
 424         drm_dev_unref(ddev);
 425 }
 426
 427 static const struct component_master_ops sti_ops = {
 428         .bind = sti_bind,
 429         .unbind = sti_unbind,
 430 };
 431
 432 static int sti_platform_probe(struct platform_device *pdev)
 433 {
 434         struct device *dev = &pdev->dev;
 435         struct device_node *node = dev->of_node;
 436         struct device_node *child_np;
 437         struct component_match *match = NULL;
 438
 439         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 440
 441         of_platform_populate(node, NULL, NULL, dev);
 442
 443         child_np = of_get_next_available_child(node, NULL);
 444
 445         while (child_np) {
 446                 drm_of_component_match_add(dev, &match, compare_of,
 447                                            child_np);
 448                 child_np = of_get_next_available_child(node, child_np);
 449         }
 450
 451         return component_master_add_with_match(dev, &sti_ops, match);
 452 }
 453
 454 static int sti_platform_remove(struct platform_device *pdev)
 455 {
 456         component_master_del(&pdev->dev, &sti_ops);
 457         of_platform_depopulate(&pdev->dev);
 458
 459         return 0;
 460 }
 461
 462 static const struct of_device_id sti_dt_ids[] = {
 463         { .compatible = "st,sti-display-subsystem", },
 464         { /* end node */ },
 465 };
 466 MODULE_DEVICE_TABLE(of, sti_dt_ids);
 467
 468 static struct platform_driver sti_platform_driver = {
 469         .probe = sti_platform_probe,
 470         .remove = sti_platform_remove,
 471         .driver = {
 472                 .name = DRIVER_NAME,
 473                 .of_match_table = sti_dt_ids,
 474         },
 475 };
 476
 477 static struct platform_driver * const drivers[] = {
 478         &sti_tvout_driver,
 479         &sti_vtac_driver,
 480         &sti_hqvdp_driver,
 481         &sti_hdmi_driver,
 482         &sti_hda_driver,
 483         &sti_dvo_driver,
 484         &sti_vtg_driver,
 485         &sti_compositor_driver,
 486         &sti_platform_driver,
 487 };
 488
 489 static int sti_drm_init(void)
 490 {
 491         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 492 }
 493 module_init(sti_drm_init);
 494
 495 static void sti_drm_exit(void)
 496 {
 497         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 498 }
 499 module_exit(sti_drm_exit);
 500
 501 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
 502 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 503 MODULE_LICENSE("GPL");