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