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 static 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, 0); 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_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 (IS_ERR(ddev)) 369 return PTR_ERR(ddev); 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"); 484