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