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_commit(struct drm_device *drm,
 200                              struct drm_atomic_state *state, bool nonblock)
 201 {
 202         struct sti_private *private = drm->dev_private;
 203         int err;
 204
 205         err = drm_atomic_helper_prepare_planes(drm, state);
 206         if (err)
 207                 return err;
 208
 209         /* serialize outstanding nonblocking commits */
 210         mutex_lock(&private->commit.lock);
 211         flush_work(&private->commit.work);
 212
 213         /*
 214          * This is the point of no return - everything below never fails except
 215          * when the hw goes bonghits. Which means we can commit the new state on
 216          * the software side now.
 217          */
 218
 219         drm_atomic_helper_swap_state(state, true);
 220
 221         drm_atomic_state_get(state);
 222         if (nonblock)
 223                 sti_atomic_schedule(private, state);
 224         else
 225                 sti_atomic_complete(private, state);
 226
 227         mutex_unlock(&private->commit.lock);
 228         return 0;
 229 }
 230
 231 static void sti_output_poll_changed(struct drm_device *ddev)
 232 {
 233         struct sti_private *private = ddev->dev_private;
 234
 235         if (!ddev->mode_config.num_connector)
 236                 return;
 237
 238         if (private->fbdev) {
 239                 drm_fbdev_cma_hotplug_event(private->fbdev);
 240                 return;
 241         }
 242
 243         private->fbdev = drm_fbdev_cma_init(ddev, 32,
 244                                             ddev->mode_config.num_crtc,
 245                                             ddev->mode_config.num_connector);
 246         if (IS_ERR(private->fbdev))
 247                 private->fbdev = NULL;
 248 }
 249
 250 static const struct drm_mode_config_funcs sti_mode_config_funcs = {
 251         .fb_create = drm_fb_cma_create,
 252         .output_poll_changed = sti_output_poll_changed,
 253         .atomic_check = drm_atomic_helper_check,
 254         .atomic_commit = sti_atomic_commit,
 255 };
 256
 257 static void sti_mode_config_init(struct drm_device *dev)
 258 {
 259         dev->mode_config.min_width = 0;
 260         dev->mode_config.min_height = 0;
 261
 262         /*
 263          * set max width and height as default value.
 264          * this value would be used to check framebuffer size limitation
 265          * at drm_mode_addfb().
 266          */
 267         dev->mode_config.max_width = STI_MAX_FB_WIDTH;
 268         dev->mode_config.max_height = STI_MAX_FB_HEIGHT;
 269
 270         dev->mode_config.funcs = &sti_mode_config_funcs;
 271 }
 272
 273 static const struct file_operations sti_driver_fops = {
 274         .owner = THIS_MODULE,
 275         .open = drm_open,
 276         .mmap = drm_gem_cma_mmap,
 277         .poll = drm_poll,
 278         .read = drm_read,
 279         .unlocked_ioctl = drm_ioctl,
 280 #ifdef CONFIG_COMPAT
 281         .compat_ioctl = drm_compat_ioctl,
 282 #endif
 283         .release = drm_release,
 284 };
 285
 286 static struct drm_driver sti_driver = {
 287         .driver_features = DRIVER_MODESET |
 288             DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
 289         .gem_free_object_unlocked = drm_gem_cma_free_object,
 290         .gem_vm_ops = &drm_gem_cma_vm_ops,
 291         .dumb_create = drm_gem_cma_dumb_create,
 292         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 293         .dumb_destroy = drm_gem_dumb_destroy,
 294         .fops = &sti_driver_fops,
 295
 296         .get_vblank_counter = drm_vblank_no_hw_counter,
 297         .enable_vblank = sti_crtc_enable_vblank,
 298         .disable_vblank = sti_crtc_disable_vblank,
 299
 300         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 301         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 302         .gem_prime_export = drm_gem_prime_export,
 303         .gem_prime_import = drm_gem_prime_import,
 304         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 305         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 306         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 307         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 308         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 309
 310         .debugfs_init = sti_drm_dbg_init,
 311         .debugfs_cleanup = sti_drm_dbg_cleanup,
 312
 313         .name = DRIVER_NAME,
 314         .desc = DRIVER_DESC,
 315         .date = DRIVER_DATE,
 316         .major = DRIVER_MAJOR,
 317         .minor = DRIVER_MINOR,
 318 };
 319
 320 static int compare_of(struct device *dev, void *data)
 321 {
 322         return dev->of_node == data;
 323 }
 324
 325 static int sti_init(struct drm_device *ddev)
 326 {
 327         struct sti_private *private;
 328
 329         private = kzalloc(sizeof(*private), GFP_KERNEL);
 330         if (!private)
 331                 return -ENOMEM;
 332
 333         ddev->dev_private = (void *)private;
 334         dev_set_drvdata(ddev->dev, ddev);
 335         private->drm_dev = ddev;
 336
 337         mutex_init(&private->commit.lock);
 338         INIT_WORK(&private->commit.work, sti_atomic_work);
 339
 340         drm_mode_config_init(ddev);
 341
 342         sti_mode_config_init(ddev);
 343
 344         drm_kms_helper_poll_init(ddev);
 345
 346         return 0;
 347 }
 348
 349 static void sti_cleanup(struct drm_device *ddev)
 350 {
 351         struct sti_private *private = ddev->dev_private;
 352
 353         if (private->fbdev) {
 354                 drm_fbdev_cma_fini(private->fbdev);
 355                 private->fbdev = NULL;
 356         }
 357
 358         drm_kms_helper_poll_fini(ddev);
 359         drm_vblank_cleanup(ddev);
 360         kfree(private);
 361         ddev->dev_private = NULL;
 362 }
 363
 364 static int sti_bind(struct device *dev)
 365 {
 366         struct drm_device *ddev;
 367         int ret;
 368
 369         ddev = drm_dev_alloc(&sti_driver, dev);
 370         if (IS_ERR(ddev))
 371                 return PTR_ERR(ddev);
 372
 373         ddev->platformdev = to_platform_device(dev);
 374
 375         ret = sti_init(ddev);
 376         if (ret)
 377                 goto err_drm_dev_unref;
 378
 379         ret = component_bind_all(ddev->dev, ddev);
 380         if (ret)
 381                 goto err_cleanup;
 382
 383         ret = drm_dev_register(ddev, 0);
 384         if (ret)
 385                 goto err_register;
 386
 387         drm_mode_config_reset(ddev);
 388
 389         return 0;
 390
 391 err_register:
 392         drm_mode_config_cleanup(ddev);
 393 err_cleanup:
 394         sti_cleanup(ddev);
 395 err_drm_dev_unref:
 396         drm_dev_unref(ddev);
 397         return ret;
 398 }
 399
 400 static void sti_unbind(struct device *dev)
 401 {
 402         struct drm_device *ddev = dev_get_drvdata(dev);
 403
 404         drm_dev_unregister(ddev);
 405         sti_cleanup(ddev);
 406         drm_dev_unref(ddev);
 407 }
 408
 409 static const struct component_master_ops sti_ops = {
 410         .bind = sti_bind,
 411         .unbind = sti_unbind,
 412 };
 413
 414 static int sti_platform_probe(struct platform_device *pdev)
 415 {
 416         struct device *dev = &pdev->dev;
 417         struct device_node *node = dev->of_node;
 418         struct device_node *child_np;
 419         struct component_match *match = NULL;
 420
 421         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 422
 423         of_platform_populate(node, NULL, NULL, dev);
 424
 425         child_np = of_get_next_available_child(node, NULL);
 426
 427         while (child_np) {
 428                 drm_of_component_match_add(dev, &match, compare_of,
 429                                            child_np);
 430                 child_np = of_get_next_available_child(node, child_np);
 431         }
 432
 433         return component_master_add_with_match(dev, &sti_ops, match);
 434 }
 435
 436 static int sti_platform_remove(struct platform_device *pdev)
 437 {
 438         component_master_del(&pdev->dev, &sti_ops);
 439         of_platform_depopulate(&pdev->dev);
 440
 441         return 0;
 442 }
 443
 444 static const struct of_device_id sti_dt_ids[] = {
 445         { .compatible = "st,sti-display-subsystem", },
 446         { /* end node */ },
 447 };
 448 MODULE_DEVICE_TABLE(of, sti_dt_ids);
 449
 450 static struct platform_driver sti_platform_driver = {
 451         .probe = sti_platform_probe,
 452         .remove = sti_platform_remove,
 453         .driver = {
 454                 .name = DRIVER_NAME,
 455                 .of_match_table = sti_dt_ids,
 456         },
 457 };
 458
 459 static struct platform_driver * const drivers[] = {
 460         &sti_tvout_driver,
 461         &sti_vtac_driver,
 462         &sti_hqvdp_driver,
 463         &sti_hdmi_driver,
 464         &sti_hda_driver,
 465         &sti_dvo_driver,
 466         &sti_vtg_driver,
 467         &sti_compositor_driver,
 468         &sti_platform_driver,
 469 };
 470
 471 static int sti_drm_init(void)
 472 {
 473         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 474 }
 475 module_init(sti_drm_init);
 476
 477 static void sti_drm_exit(void)
 478 {
 479         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 480 }
 481 module_exit(sti_drm_exit);
 482
 483 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
 484 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 485 MODULE_LICENSE("GPL");