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