drivers/gpu/drm/imx/imx-drm-core.c

   1 /*
   2  * Freescale i.MX drm driver
   3  *
   4  * Copyright (C) 2011 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16 #include <linux/component.h>
  17 #include <linux/device.h>
  18 #include <linux/fb.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <drm/drmP.h>
  22 #include <drm/drm_fb_helper.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <drm/drm_gem_cma_helper.h>
  25 #include <drm/drm_fb_cma_helper.h>
  26 #include <drm/drm_plane_helper.h>
  27 #include <drm/drm_of.h>
  28 #include <video/imx-ipu-v3.h>
  29
  30 #include "imx-drm.h"
  31
  32 #define MAX_CRTC        4
  33
  34 struct imx_drm_component {
  35         struct device_node *of_node;
  36         struct list_head list;
  37 };
  38
  39 struct imx_drm_device {
  40         struct drm_device                       *drm;
  41         struct imx_drm_crtc                     *crtc[MAX_CRTC];
  42         unsigned int                            pipes;
  43         struct drm_fbdev_cma                    *fbhelper;
  44 };
  45
  46 struct imx_drm_crtc {
  47         struct drm_crtc                         *crtc;
  48         struct imx_drm_crtc_helper_funcs        imx_drm_helper_funcs;
  49 };
  50
  51 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
  52 static int legacyfb_depth = 16;
  53 module_param(legacyfb_depth, int, 0444);
  54 #endif
  55
  56 unsigned int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
  57 {
  58         return drm_crtc_index(crtc->crtc);
  59 }
  60 EXPORT_SYMBOL_GPL(imx_drm_crtc_id);
  61
  62 static void imx_drm_driver_lastclose(struct drm_device *drm)
  63 {
  64         struct imx_drm_device *imxdrm = drm->dev_private;
  65
  66         drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
  67 }
  68
  69 static int imx_drm_driver_unload(struct drm_device *drm)
  70 {
  71         struct imx_drm_device *imxdrm = drm->dev_private;
  72
  73         drm_kms_helper_poll_fini(drm);
  74
  75         if (imxdrm->fbhelper)
  76                 drm_fbdev_cma_fini(imxdrm->fbhelper);
  77
  78         component_unbind_all(drm->dev, drm);
  79
  80         drm_vblank_cleanup(drm);
  81         drm_mode_config_cleanup(drm);
  82
  83         platform_set_drvdata(drm->platformdev, NULL);
  84
  85         return 0;
  86 }
  87
  88 static struct imx_drm_crtc *imx_drm_find_crtc(struct drm_crtc *crtc)
  89 {
  90         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
  91         unsigned i;
  92
  93         for (i = 0; i < MAX_CRTC; i++)
  94                 if (imxdrm->crtc[i] && imxdrm->crtc[i]->crtc == crtc)
  95                         return imxdrm->crtc[i];
  96
  97         return NULL;
  98 }
  99
 100 int imx_drm_set_bus_config(struct drm_encoder *encoder, u32 bus_format,
 101                 int hsync_pin, int vsync_pin, u32 bus_flags)
 102 {
 103         struct imx_drm_crtc_helper_funcs *helper;
 104         struct imx_drm_crtc *imx_crtc;
 105
 106         imx_crtc = imx_drm_find_crtc(encoder->crtc);
 107         if (!imx_crtc)
 108                 return -EINVAL;
 109
 110         helper = &imx_crtc->imx_drm_helper_funcs;
 111         if (helper->set_interface_pix_fmt)
 112                 return helper->set_interface_pix_fmt(encoder->crtc,
 113                                         bus_format, hsync_pin, vsync_pin,
 114                                         bus_flags);
 115         return 0;
 116 }
 117 EXPORT_SYMBOL_GPL(imx_drm_set_bus_config);
 118
 119 int imx_drm_set_bus_format(struct drm_encoder *encoder, u32 bus_format)
 120 {
 121         return imx_drm_set_bus_config(encoder, bus_format, 2, 3,
 122                                       DRM_BUS_FLAG_DE_HIGH |
 123                                       DRM_BUS_FLAG_PIXDATA_NEGEDGE);
 124 }
 125 EXPORT_SYMBOL_GPL(imx_drm_set_bus_format);
 126
 127 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
 128 {
 129         return drm_crtc_vblank_get(imx_drm_crtc->crtc);
 130 }
 131 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
 132
 133 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
 134 {
 135         drm_crtc_vblank_put(imx_drm_crtc->crtc);
 136 }
 137 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
 138
 139 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
 140 {
 141         drm_crtc_handle_vblank(imx_drm_crtc->crtc);
 142 }
 143 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
 144
 145 static int imx_drm_enable_vblank(struct drm_device *drm, unsigned int pipe)
 146 {
 147         struct imx_drm_device *imxdrm = drm->dev_private;
 148         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[pipe];
 149         int ret;
 150
 151         if (!imx_drm_crtc)
 152                 return -EINVAL;
 153
 154         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 155                 return -ENOSYS;
 156
 157         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 158                         imx_drm_crtc->crtc);
 159
 160         return ret;
 161 }
 162
 163 static void imx_drm_disable_vblank(struct drm_device *drm, unsigned int pipe)
 164 {
 165         struct imx_drm_device *imxdrm = drm->dev_private;
 166         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[pipe];
 167
 168         if (!imx_drm_crtc)
 169                 return;
 170
 171         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 172                 return;
 173
 174         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 175 }
 176
 177 static const struct file_operations imx_drm_driver_fops = {
 178         .owner = THIS_MODULE,
 179         .open = drm_open,
 180         .release = drm_release,
 181         .unlocked_ioctl = drm_ioctl,
 182         .mmap = drm_gem_cma_mmap,
 183         .poll = drm_poll,
 184         .read = drm_read,
 185         .llseek = noop_llseek,
 186 };
 187
 188 void imx_drm_connector_destroy(struct drm_connector *connector)
 189 {
 190         drm_connector_unregister(connector);
 191         drm_connector_cleanup(connector);
 192 }
 193 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
 194
 195 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
 196 {
 197         drm_encoder_cleanup(encoder);
 198 }
 199 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
 200
 201 static void imx_drm_output_poll_changed(struct drm_device *drm)
 202 {
 203         struct imx_drm_device *imxdrm = drm->dev_private;
 204
 205         drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
 206 }
 207
 208 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
 209         .fb_create = drm_fb_cma_create,
 210         .output_poll_changed = imx_drm_output_poll_changed,
 211 };
 212
 213 /*
 214  * Main DRM initialisation. This binds, initialises and registers
 215  * with DRM the subcomponents of the driver.
 216  */
 217 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 218 {
 219         struct imx_drm_device *imxdrm;
 220         struct drm_connector *connector;
 221         int ret;
 222
 223         imxdrm = devm_kzalloc(drm->dev, sizeof(*imxdrm), GFP_KERNEL);
 224         if (!imxdrm)
 225                 return -ENOMEM;
 226
 227         imxdrm->drm = drm;
 228
 229         drm->dev_private = imxdrm;
 230
 231         /*
 232          * enable drm irq mode.
 233          * - with irq_enabled = true, we can use the vblank feature.
 234          *
 235          * P.S. note that we wouldn't use drm irq handler but
 236          *      just specific driver own one instead because
 237          *      drm framework supports only one irq handler and
 238          *      drivers can well take care of their interrupts
 239          */
 240         drm->irq_enabled = true;
 241
 242         /*
 243          * set max width and height as default value(4096x4096).
 244          * this value would be used to check framebuffer size limitation
 245          * at drm_mode_addfb().
 246          */
 247         drm->mode_config.min_width = 64;
 248         drm->mode_config.min_height = 64;
 249         drm->mode_config.max_width = 4096;
 250         drm->mode_config.max_height = 4096;
 251         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 252
 253         drm_mode_config_init(drm);
 254
 255         ret = drm_vblank_init(drm, MAX_CRTC);
 256         if (ret)
 257                 goto err_kms;
 258
 259         platform_set_drvdata(drm->platformdev, drm);
 260
 261         /* Now try and bind all our sub-components */
 262         ret = component_bind_all(drm->dev, drm);
 263         if (ret)
 264                 goto err_vblank;
 265
 266         /*
 267          * All components are now added, we can publish the connector sysfs
 268          * entries to userspace.  This will generate hotplug events and so
 269          * userspace will expect to be able to access DRM at this point.
 270          */
 271         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 272                 ret = drm_connector_register(connector);
 273                 if (ret) {
 274                         dev_err(drm->dev,
 275                                 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
 276                                 connector->base.id,
 277                                 connector->name, ret);
 278                         goto err_unbind;
 279                 }
 280         }
 281
 282         /*
 283          * All components are now initialised, so setup the fb helper.
 284          * The fb helper takes copies of key hardware information, so the
 285          * crtcs/connectors/encoders must not change after this point.
 286          */
 287 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 288         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 289                 dev_warn(drm->dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 290                 legacyfb_depth = 16;
 291         }
 292         drm_helper_disable_unused_functions(drm);
 293         imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth,
 294                                 drm->mode_config.num_crtc, MAX_CRTC);
 295         if (IS_ERR(imxdrm->fbhelper)) {
 296                 ret = PTR_ERR(imxdrm->fbhelper);
 297                 imxdrm->fbhelper = NULL;
 298                 goto err_unbind;
 299         }
 300 #endif
 301
 302         drm_kms_helper_poll_init(drm);
 303
 304         return 0;
 305
 306 err_unbind:
 307         component_unbind_all(drm->dev, drm);
 308 err_vblank:
 309         drm_vblank_cleanup(drm);
 310 err_kms:
 311         drm_mode_config_cleanup(drm);
 312
 313         return ret;
 314 }
 315
 316 /*
 317  * imx_drm_add_crtc - add a new crtc
 318  */
 319 int imx_drm_add_crtc(struct drm_device *drm, struct drm_crtc *crtc,
 320                 struct imx_drm_crtc **new_crtc, struct drm_plane *primary_plane,
 321                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 322                 struct device_node *port)
 323 {
 324         struct imx_drm_device *imxdrm = drm->dev_private;
 325         struct imx_drm_crtc *imx_drm_crtc;
 326
 327         /*
 328          * The vblank arrays are dimensioned by MAX_CRTC - we can't
 329          * pass IDs greater than this to those functions.
 330          */
 331         if (imxdrm->pipes >= MAX_CRTC)
 332                 return -EINVAL;
 333
 334         if (imxdrm->drm->open_count)
 335                 return -EBUSY;
 336
 337         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 338         if (!imx_drm_crtc)
 339                 return -ENOMEM;
 340
 341         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 342         imx_drm_crtc->crtc = crtc;
 343
 344         crtc->port = port;
 345
 346         imxdrm->crtc[imxdrm->pipes++] = imx_drm_crtc;
 347
 348         *new_crtc = imx_drm_crtc;
 349
 350         drm_crtc_helper_add(crtc,
 351                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 352
 353         drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
 354                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs, NULL);
 355
 356         return 0;
 357 }
 358 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 359
 360 /*
 361  * imx_drm_remove_crtc - remove a crtc
 362  */
 363 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 364 {
 365         struct imx_drm_device *imxdrm = imx_drm_crtc->crtc->dev->dev_private;
 366         unsigned int pipe = drm_crtc_index(imx_drm_crtc->crtc);
 367
 368         drm_crtc_cleanup(imx_drm_crtc->crtc);
 369
 370         imxdrm->crtc[pipe] = NULL;
 371
 372         kfree(imx_drm_crtc);
 373
 374         return 0;
 375 }
 376 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 377
 378 int imx_drm_encoder_parse_of(struct drm_device *drm,
 379         struct drm_encoder *encoder, struct device_node *np)
 380 {
 381         uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
 382
 383         /*
 384          * If we failed to find the CRTC(s) which this encoder is
 385          * supposed to be connected to, it's because the CRTC has
 386          * not been registered yet.  Defer probing, and hope that
 387          * the required CRTC is added later.
 388          */
 389         if (crtc_mask == 0)
 390                 return -EPROBE_DEFER;
 391
 392         encoder->possible_crtcs = crtc_mask;
 393
 394         /* FIXME: this is the mask of outputs which can clone this output. */
 395         encoder->possible_clones = ~0;
 396
 397         return 0;
 398 }
 399 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
 400
 401 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 402         /* none so far */
 403 };
 404
 405 static struct drm_driver imx_drm_driver = {
 406         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 407         .load                   = imx_drm_driver_load,
 408         .unload                 = imx_drm_driver_unload,
 409         .lastclose              = imx_drm_driver_lastclose,
 410         .set_busid              = drm_platform_set_busid,
 411         .gem_free_object_unlocked = drm_gem_cma_free_object,
 412         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 413         .dumb_create            = drm_gem_cma_dumb_create,
 414         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 415         .dumb_destroy           = drm_gem_dumb_destroy,
 416
 417         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 418         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 419         .gem_prime_import       = drm_gem_prime_import,
 420         .gem_prime_export       = drm_gem_prime_export,
 421         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 422         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 423         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 424         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 425         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 426         .get_vblank_counter     = drm_vblank_no_hw_counter,
 427         .enable_vblank          = imx_drm_enable_vblank,
 428         .disable_vblank         = imx_drm_disable_vblank,
 429         .ioctls                 = imx_drm_ioctls,
 430         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 431         .fops                   = &imx_drm_driver_fops,
 432         .name                   = "imx-drm",
 433         .desc                   = "i.MX DRM graphics",
 434         .date                   = "20120507",
 435         .major                  = 1,
 436         .minor                  = 0,
 437         .patchlevel             = 0,
 438 };
 439
 440 static int compare_of(struct device *dev, void *data)
 441 {
 442         struct device_node *np = data;
 443
 444         /* Special case for DI, dev->of_node may not be set yet */
 445         if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
 446                 struct ipu_client_platformdata *pdata = dev->platform_data;
 447
 448                 return pdata->of_node == np;
 449         }
 450
 451         /* Special case for LDB, one device for two channels */
 452         if (of_node_cmp(np->name, "lvds-channel") == 0) {
 453                 np = of_get_parent(np);
 454                 of_node_put(np);
 455         }
 456
 457         return dev->of_node == np;
 458 }
 459
 460 static int imx_drm_bind(struct device *dev)
 461 {
 462         return drm_platform_init(&imx_drm_driver, to_platform_device(dev));
 463 }
 464
 465 static void imx_drm_unbind(struct device *dev)
 466 {
 467         drm_put_dev(dev_get_drvdata(dev));
 468 }
 469
 470 static const struct component_master_ops imx_drm_ops = {
 471         .bind = imx_drm_bind,
 472         .unbind = imx_drm_unbind,
 473 };
 474
 475 static int imx_drm_platform_probe(struct platform_device *pdev)
 476 {
 477         int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
 478
 479         if (!ret)
 480                 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 481
 482         return ret;
 483 }
 484
 485 static int imx_drm_platform_remove(struct platform_device *pdev)
 486 {
 487         component_master_del(&pdev->dev, &imx_drm_ops);
 488         return 0;
 489 }
 490
 491 #ifdef CONFIG_PM_SLEEP
 492 static int imx_drm_suspend(struct device *dev)
 493 {
 494         struct drm_device *drm_dev = dev_get_drvdata(dev);
 495
 496         /* The drm_dev is NULL before .load hook is called */
 497         if (drm_dev == NULL)
 498                 return 0;
 499
 500         drm_kms_helper_poll_disable(drm_dev);
 501
 502         return 0;
 503 }
 504
 505 static int imx_drm_resume(struct device *dev)
 506 {
 507         struct drm_device *drm_dev = dev_get_drvdata(dev);
 508
 509         if (drm_dev == NULL)
 510                 return 0;
 511
 512         drm_helper_resume_force_mode(drm_dev);
 513         drm_kms_helper_poll_enable(drm_dev);
 514
 515         return 0;
 516 }
 517 #endif
 518
 519 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 520
 521 static const struct of_device_id imx_drm_dt_ids[] = {
 522         { .compatible = "fsl,imx-display-subsystem", },
 523         { /* sentinel */ },
 524 };
 525 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 526
 527 static struct platform_driver imx_drm_pdrv = {
 528         .probe          = imx_drm_platform_probe,
 529         .remove         = imx_drm_platform_remove,
 530         .driver         = {
 531                 .name   = "imx-drm",
 532                 .pm     = &imx_drm_pm_ops,
 533                 .of_match_table = imx_drm_dt_ids,
 534         },
 535 };
 536 module_platform_driver(imx_drm_pdrv);
 537
 538 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 539 MODULE_DESCRIPTION("i.MX drm driver core");
 540 MODULE_LICENSE("GPL");