drivers/video/omap2/dss/core.c

   1 /*
   2  * linux/drivers/video/omap2/dss/core.c
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
   6  *
   7  * Some code and ideas taken from drivers/video/omap/ driver
   8  * by Imre Deak.
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along with
  20  * this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #define DSS_SUBSYS_NAME "CORE"
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/clk.h>
  28 #include <linux/err.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/io.h>
  33 #include <linux/device.h>
  34 #include <linux/regulator/consumer.h>
  35 #include <linux/suspend.h>
  36 #include <linux/slab.h>
  37
  38 #include <video/omapdss.h>
  39
  40 #include "dss.h"
  41 #include "dss_features.h"
  42
  43 static struct {
  44         struct platform_device *pdev;
  45
  46         struct regulator *vdds_dsi_reg;
  47         struct regulator *vdds_sdi_reg;
  48
  49         const char *default_display_name;
  50 } core;
  51
  52 static char *def_disp_name;
  53 module_param_named(def_disp, def_disp_name, charp, 0);
  54 MODULE_PARM_DESC(def_disp, "default display name");
  55
  56 const char *omapdss_get_default_display_name(void)
  57 {
  58         return core.default_display_name;
  59 }
  60 EXPORT_SYMBOL(omapdss_get_default_display_name);
  61
  62 enum omapdss_version omapdss_get_version(void)
  63 {
  64         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
  65         return pdata->version;
  66 }
  67 EXPORT_SYMBOL(omapdss_get_version);
  68
  69 struct platform_device *dss_get_core_pdev(void)
  70 {
  71         return core.pdev;
  72 }
  73
  74 /* REGULATORS */
  75
  76 struct regulator *dss_get_vdds_dsi(void)
  77 {
  78         struct regulator *reg;
  79
  80         if (core.vdds_dsi_reg != NULL)
  81                 return core.vdds_dsi_reg;
  82
  83         reg = regulator_get(&core.pdev->dev, "vdds_dsi");
  84         if (!IS_ERR(reg))
  85                 core.vdds_dsi_reg = reg;
  86
  87         return reg;
  88 }
  89
  90 struct regulator *dss_get_vdds_sdi(void)
  91 {
  92         struct regulator *reg;
  93
  94         if (core.vdds_sdi_reg != NULL)
  95                 return core.vdds_sdi_reg;
  96
  97         reg = regulator_get(&core.pdev->dev, "vdds_sdi");
  98         if (!IS_ERR(reg))
  99                 core.vdds_sdi_reg = reg;
 100
 101         return reg;
 102 }
 103
 104 int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
 105 {
 106         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
 107
 108         if (!board_data->dsi_enable_pads)
 109                 return -ENOENT;
 110
 111         return board_data->dsi_enable_pads(dsi_id, lane_mask);
 112 }
 113
 114 void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
 115 {
 116         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
 117
 118         if (!board_data->dsi_disable_pads)
 119                 return;
 120
 121         return board_data->dsi_disable_pads(dsi_id, lane_mask);
 122 }
 123
 124 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
 125 {
 126         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 127
 128         if (pdata->set_min_bus_tput)
 129                 return pdata->set_min_bus_tput(dev, tput);
 130         else
 131                 return 0;
 132 }
 133
 134 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
 135 static int dss_debug_show(struct seq_file *s, void *unused)
 136 {
 137         void (*func)(struct seq_file *) = s->private;
 138         func(s);
 139         return 0;
 140 }
 141
 142 static int dss_debug_open(struct inode *inode, struct file *file)
 143 {
 144         return single_open(file, dss_debug_show, inode->i_private);
 145 }
 146
 147 static const struct file_operations dss_debug_fops = {
 148         .open           = dss_debug_open,
 149         .read           = seq_read,
 150         .llseek         = seq_lseek,
 151         .release        = single_release,
 152 };
 153
 154 static struct dentry *dss_debugfs_dir;
 155
 156 static int dss_initialize_debugfs(void)
 157 {
 158         dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
 159         if (IS_ERR(dss_debugfs_dir)) {
 160                 int err = PTR_ERR(dss_debugfs_dir);
 161                 dss_debugfs_dir = NULL;
 162                 return err;
 163         }
 164
 165         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
 166                         &dss_debug_dump_clocks, &dss_debug_fops);
 167
 168         return 0;
 169 }
 170
 171 static void dss_uninitialize_debugfs(void)
 172 {
 173         if (dss_debugfs_dir)
 174                 debugfs_remove_recursive(dss_debugfs_dir);
 175 }
 176
 177 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 178 {
 179         struct dentry *d;
 180
 181         d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
 182                         write, &dss_debug_fops);
 183
 184         return PTR_RET(d);
 185 }
 186 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
 187 static inline int dss_initialize_debugfs(void)
 188 {
 189         return 0;
 190 }
 191 static inline void dss_uninitialize_debugfs(void)
 192 {
 193 }
 194 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 195 {
 196         return 0;
 197 }
 198 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
 199
 200 /* PLATFORM DEVICE */
 201 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
 202 {
 203         DSSDBG("pm notif %lu\n", v);
 204
 205         switch (v) {
 206         case PM_SUSPEND_PREPARE:
 207                 DSSDBG("suspending displays\n");
 208                 return dss_suspend_all_devices();
 209
 210         case PM_POST_SUSPEND:
 211                 DSSDBG("resuming displays\n");
 212                 return dss_resume_all_devices();
 213
 214         default:
 215                 return 0;
 216         }
 217 }
 218
 219 static struct notifier_block omap_dss_pm_notif_block = {
 220         .notifier_call = omap_dss_pm_notif,
 221 };
 222
 223 static int __init omap_dss_probe(struct platform_device *pdev)
 224 {
 225         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 226         int r;
 227
 228         core.pdev = pdev;
 229
 230         dss_features_init(omapdss_get_version());
 231
 232         r = dss_initialize_debugfs();
 233         if (r)
 234                 goto err_debugfs;
 235
 236         if (def_disp_name)
 237                 core.default_display_name = def_disp_name;
 238         else if (pdata->default_device)
 239                 core.default_display_name = pdata->default_device->name;
 240
 241         register_pm_notifier(&omap_dss_pm_notif_block);
 242
 243         return 0;
 244
 245 err_debugfs:
 246
 247         return r;
 248 }
 249
 250 static int omap_dss_remove(struct platform_device *pdev)
 251 {
 252         unregister_pm_notifier(&omap_dss_pm_notif_block);
 253
 254         dss_uninitialize_debugfs();
 255
 256         return 0;
 257 }
 258
 259 static void omap_dss_shutdown(struct platform_device *pdev)
 260 {
 261         DSSDBG("shutdown\n");
 262         dss_disable_all_devices();
 263 }
 264
 265 static struct platform_driver omap_dss_driver = {
 266         .remove         = omap_dss_remove,
 267         .shutdown       = omap_dss_shutdown,
 268         .driver         = {
 269                 .name   = "omapdss",
 270                 .owner  = THIS_MODULE,
 271         },
 272 };
 273
 274 /* BUS */
 275 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 276 {
 277         struct omap_dss_device *dssdev = to_dss_device(dev);
 278
 279         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 280                         dev_name(dev), dssdev->driver_name, driver->name);
 281
 282         return strcmp(dssdev->driver_name, driver->name) == 0;
 283 }
 284
 285 static ssize_t device_name_show(struct device *dev,
 286                 struct device_attribute *attr, char *buf)
 287 {
 288         struct omap_dss_device *dssdev = to_dss_device(dev);
 289         return snprintf(buf, PAGE_SIZE, "%s\n",
 290                         dssdev->name ?
 291                         dssdev->name : "");
 292 }
 293
 294 static struct device_attribute default_dev_attrs[] = {
 295         __ATTR(name, S_IRUGO, device_name_show, NULL),
 296         __ATTR_NULL,
 297 };
 298
 299 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 300 {
 301         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 302         return snprintf(buf, PAGE_SIZE, "%s\n",
 303                         dssdrv->driver.name ?
 304                         dssdrv->driver.name : "");
 305 }
 306 static struct driver_attribute default_drv_attrs[] = {
 307         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 308         __ATTR_NULL,
 309 };
 310
 311 static struct bus_type dss_bus_type = {
 312         .name = "omapdss",
 313         .match = dss_bus_match,
 314         .dev_attrs = default_dev_attrs,
 315         .drv_attrs = default_drv_attrs,
 316 };
 317
 318 static void dss_bus_release(struct device *dev)
 319 {
 320         DSSDBG("bus_release\n");
 321 }
 322
 323 static struct device dss_bus = {
 324         .release = dss_bus_release,
 325 };
 326
 327 struct bus_type *dss_get_bus(void)
 328 {
 329         return &dss_bus_type;
 330 }
 331
 332 /* DRIVER */
 333 static int dss_driver_probe(struct device *dev)
 334 {
 335         int r;
 336         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 337         struct omap_dss_device *dssdev = to_dss_device(dev);
 338
 339         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 340                                 dev_name(dev), dssdev->driver_name,
 341                                 dssdrv->driver.name);
 342
 343         r = dssdrv->probe(dssdev);
 344
 345         if (r) {
 346                 DSSERR("driver probe failed: %d\n", r);
 347                 return r;
 348         }
 349
 350         DSSDBG("probe done for device %s\n", dev_name(dev));
 351
 352         dssdev->driver = dssdrv;
 353
 354         return 0;
 355 }
 356
 357 static int dss_driver_remove(struct device *dev)
 358 {
 359         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 360         struct omap_dss_device *dssdev = to_dss_device(dev);
 361
 362         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 363                         dssdev->driver_name);
 364
 365         dssdrv->remove(dssdev);
 366
 367         dssdev->driver = NULL;
 368
 369         return 0;
 370 }
 371
 372 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 373 {
 374         dssdriver->driver.bus = &dss_bus_type;
 375         dssdriver->driver.probe = dss_driver_probe;
 376         dssdriver->driver.remove = dss_driver_remove;
 377
 378         if (dssdriver->get_resolution == NULL)
 379                 dssdriver->get_resolution = omapdss_default_get_resolution;
 380         if (dssdriver->get_recommended_bpp == NULL)
 381                 dssdriver->get_recommended_bpp =
 382                         omapdss_default_get_recommended_bpp;
 383         if (dssdriver->get_timings == NULL)
 384                 dssdriver->get_timings = omapdss_default_get_timings;
 385
 386         return driver_register(&dssdriver->driver);
 387 }
 388 EXPORT_SYMBOL(omap_dss_register_driver);
 389
 390 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 391 {
 392         driver_unregister(&dssdriver->driver);
 393 }
 394 EXPORT_SYMBOL(omap_dss_unregister_driver);
 395
 396 /* DEVICE */
 397
 398 static void omap_dss_dev_release(struct device *dev)
 399 {
 400         struct omap_dss_device *dssdev = to_dss_device(dev);
 401         kfree(dssdev);
 402 }
 403
 404 static int disp_num_counter;
 405
 406 struct omap_dss_device *dss_alloc_and_init_device(struct device *parent)
 407 {
 408         struct omap_dss_device *dssdev;
 409
 410         dssdev = kzalloc(sizeof(*dssdev), GFP_KERNEL);
 411         if (!dssdev)
 412                 return NULL;
 413
 414         dssdev->dev.bus = &dss_bus_type;
 415         dssdev->dev.parent = parent;
 416         dssdev->dev.release = omap_dss_dev_release;
 417         dev_set_name(&dssdev->dev, "display%d", disp_num_counter++);
 418
 419         device_initialize(&dssdev->dev);
 420
 421         return dssdev;
 422 }
 423
 424 int dss_add_device(struct omap_dss_device *dssdev)
 425 {
 426         return device_add(&dssdev->dev);
 427 }
 428
 429 void dss_put_device(struct omap_dss_device *dssdev)
 430 {
 431         put_device(&dssdev->dev);
 432 }
 433
 434 void dss_unregister_device(struct omap_dss_device *dssdev)
 435 {
 436         device_unregister(&dssdev->dev);
 437 }
 438
 439 static int dss_unregister_dss_dev(struct device *dev, void *data)
 440 {
 441         struct omap_dss_device *dssdev = to_dss_device(dev);
 442         dss_unregister_device(dssdev);
 443         return 0;
 444 }
 445
 446 void dss_unregister_child_devices(struct device *parent)
 447 {
 448         device_for_each_child(parent, NULL, dss_unregister_dss_dev);
 449 }
 450
 451 void dss_copy_device_pdata(struct omap_dss_device *dst,
 452                 const struct omap_dss_device *src)
 453 {
 454         u8 *d = (u8 *)dst;
 455         u8 *s = (u8 *)src;
 456         size_t dsize = sizeof(struct device);
 457
 458         memcpy(d + dsize, s + dsize, sizeof(struct omap_dss_device) - dsize);
 459 }
 460
 461 /* BUS */
 462 static int __init omap_dss_bus_register(void)
 463 {
 464         int r;
 465
 466         r = bus_register(&dss_bus_type);
 467         if (r) {
 468                 DSSERR("bus register failed\n");
 469                 return r;
 470         }
 471
 472         dev_set_name(&dss_bus, "omapdss");
 473         r = device_register(&dss_bus);
 474         if (r) {
 475                 DSSERR("bus driver register failed\n");
 476                 bus_unregister(&dss_bus_type);
 477                 return r;
 478         }
 479
 480         return 0;
 481 }
 482
 483 /* INIT */
 484 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
 485 #ifdef CONFIG_OMAP2_DSS_DSI
 486         dsi_init_platform_driver,
 487 #endif
 488 #ifdef CONFIG_OMAP2_DSS_DPI
 489         dpi_init_platform_driver,
 490 #endif
 491 #ifdef CONFIG_OMAP2_DSS_SDI
 492         sdi_init_platform_driver,
 493 #endif
 494 #ifdef CONFIG_OMAP2_DSS_RFBI
 495         rfbi_init_platform_driver,
 496 #endif
 497 #ifdef CONFIG_OMAP2_DSS_VENC
 498         venc_init_platform_driver,
 499 #endif
 500 #ifdef CONFIG_OMAP4_DSS_HDMI
 501         hdmi_init_platform_driver,
 502 #endif
 503 };
 504
 505 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
 506 #ifdef CONFIG_OMAP2_DSS_DSI
 507         dsi_uninit_platform_driver,
 508 #endif
 509 #ifdef CONFIG_OMAP2_DSS_DPI
 510         dpi_uninit_platform_driver,
 511 #endif
 512 #ifdef CONFIG_OMAP2_DSS_SDI
 513         sdi_uninit_platform_driver,
 514 #endif
 515 #ifdef CONFIG_OMAP2_DSS_RFBI
 516         rfbi_uninit_platform_driver,
 517 #endif
 518 #ifdef CONFIG_OMAP2_DSS_VENC
 519         venc_uninit_platform_driver,
 520 #endif
 521 #ifdef CONFIG_OMAP4_DSS_HDMI
 522         hdmi_uninit_platform_driver,
 523 #endif
 524 };
 525
 526 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
 527
 528 static int __init omap_dss_register_drivers(void)
 529 {
 530         int r;
 531         int i;
 532
 533         r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
 534         if (r)
 535                 return r;
 536
 537         r = dss_init_platform_driver();
 538         if (r) {
 539                 DSSERR("Failed to initialize DSS platform driver\n");
 540                 goto err_dss;
 541         }
 542
 543         r = dispc_init_platform_driver();
 544         if (r) {
 545                 DSSERR("Failed to initialize dispc platform driver\n");
 546                 goto err_dispc;
 547         }
 548
 549         /*
 550          * It's ok if the output-driver register fails. It happens, for example,
 551          * when there is no output-device (e.g. SDI for OMAP4).
 552          */
 553         for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
 554                 r = dss_output_drv_reg_funcs[i]();
 555                 if (r == 0)
 556                         dss_output_drv_loaded[i] = true;
 557         }
 558
 559         return 0;
 560
 561 err_dispc:
 562         dss_uninit_platform_driver();
 563 err_dss:
 564         platform_driver_unregister(&omap_dss_driver);
 565
 566         return r;
 567 }
 568
 569 static void __exit omap_dss_unregister_drivers(void)
 570 {
 571         int i;
 572
 573         for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
 574                 if (dss_output_drv_loaded[i])
 575                         dss_output_drv_unreg_funcs[i]();
 576         }
 577
 578         dispc_uninit_platform_driver();
 579         dss_uninit_platform_driver();
 580
 581         platform_driver_unregister(&omap_dss_driver);
 582 }
 583
 584 #ifdef CONFIG_OMAP2_DSS_MODULE
 585 static void omap_dss_bus_unregister(void)
 586 {
 587         device_unregister(&dss_bus);
 588
 589         bus_unregister(&dss_bus_type);
 590 }
 591
 592 static int __init omap_dss_init(void)
 593 {
 594         int r;
 595
 596         r = omap_dss_bus_register();
 597         if (r)
 598                 return r;
 599
 600         r = omap_dss_register_drivers();
 601         if (r) {
 602                 omap_dss_bus_unregister();
 603                 return r;
 604         }
 605
 606         return 0;
 607 }
 608
 609 static void __exit omap_dss_exit(void)
 610 {
 611         if (core.vdds_dsi_reg != NULL) {
 612                 regulator_put(core.vdds_dsi_reg);
 613                 core.vdds_dsi_reg = NULL;
 614         }
 615
 616         if (core.vdds_sdi_reg != NULL) {
 617                 regulator_put(core.vdds_sdi_reg);
 618                 core.vdds_sdi_reg = NULL;
 619         }
 620
 621         omap_dss_unregister_drivers();
 622
 623         omap_dss_bus_unregister();
 624 }
 625
 626 module_init(omap_dss_init);
 627 module_exit(omap_dss_exit);
 628 #else
 629 static int __init omap_dss_init(void)
 630 {
 631         return omap_dss_bus_register();
 632 }
 633
 634 static int __init omap_dss_init2(void)
 635 {
 636         return omap_dss_register_drivers();
 637 }
 638
 639 core_initcall(omap_dss_init);
 640 device_initcall(omap_dss_init2);
 641 #endif
 642
 643 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 644 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 645 MODULE_LICENSE("GPL v2");
 646