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         if (IS_ERR(d))
 185                 return PTR_ERR(d);
 186
 187         return 0;
 188 }
 189 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
 190 static inline int dss_initialize_debugfs(void)
 191 {
 192         return 0;
 193 }
 194 static inline void dss_uninitialize_debugfs(void)
 195 {
 196 }
 197 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 198 {
 199         return 0;
 200 }
 201 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
 202
 203 /* PLATFORM DEVICE */
 204 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
 205 {
 206         DSSDBG("pm notif %lu\n", v);
 207
 208         switch (v) {
 209         case PM_SUSPEND_PREPARE:
 210                 DSSDBG("suspending displays\n");
 211                 return dss_suspend_all_devices();
 212
 213         case PM_POST_SUSPEND:
 214                 DSSDBG("resuming displays\n");
 215                 return dss_resume_all_devices();
 216
 217         default:
 218                 return 0;
 219         }
 220 }
 221
 222 static struct notifier_block omap_dss_pm_notif_block = {
 223         .notifier_call = omap_dss_pm_notif,
 224 };
 225
 226 static int __init omap_dss_probe(struct platform_device *pdev)
 227 {
 228         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 229         int r;
 230
 231         core.pdev = pdev;
 232
 233         dss_features_init(omapdss_get_version());
 234
 235         r = dss_initialize_debugfs();
 236         if (r)
 237                 goto err_debugfs;
 238
 239         if (def_disp_name)
 240                 core.default_display_name = def_disp_name;
 241         else if (pdata->default_device)
 242                 core.default_display_name = pdata->default_device->name;
 243
 244         register_pm_notifier(&omap_dss_pm_notif_block);
 245
 246         return 0;
 247
 248 err_debugfs:
 249
 250         return r;
 251 }
 252
 253 static int omap_dss_remove(struct platform_device *pdev)
 254 {
 255         unregister_pm_notifier(&omap_dss_pm_notif_block);
 256
 257         dss_uninitialize_debugfs();
 258
 259         return 0;
 260 }
 261
 262 static void omap_dss_shutdown(struct platform_device *pdev)
 263 {
 264         DSSDBG("shutdown\n");
 265         dss_disable_all_devices();
 266 }
 267
 268 static struct platform_driver omap_dss_driver = {
 269         .remove         = omap_dss_remove,
 270         .shutdown       = omap_dss_shutdown,
 271         .driver         = {
 272                 .name   = "omapdss",
 273                 .owner  = THIS_MODULE,
 274         },
 275 };
 276
 277 /* BUS */
 278 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 279 {
 280         struct omap_dss_device *dssdev = to_dss_device(dev);
 281
 282         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 283                         dev_name(dev), dssdev->driver_name, driver->name);
 284
 285         return strcmp(dssdev->driver_name, driver->name) == 0;
 286 }
 287
 288 static ssize_t device_name_show(struct device *dev,
 289                 struct device_attribute *attr, char *buf)
 290 {
 291         struct omap_dss_device *dssdev = to_dss_device(dev);
 292         return snprintf(buf, PAGE_SIZE, "%s\n",
 293                         dssdev->name ?
 294                         dssdev->name : "");
 295 }
 296
 297 static struct device_attribute default_dev_attrs[] = {
 298         __ATTR(name, S_IRUGO, device_name_show, NULL),
 299         __ATTR_NULL,
 300 };
 301
 302 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 303 {
 304         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 305         return snprintf(buf, PAGE_SIZE, "%s\n",
 306                         dssdrv->driver.name ?
 307                         dssdrv->driver.name : "");
 308 }
 309 static struct driver_attribute default_drv_attrs[] = {
 310         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 311         __ATTR_NULL,
 312 };
 313
 314 static struct bus_type dss_bus_type = {
 315         .name = "omapdss",
 316         .match = dss_bus_match,
 317         .dev_attrs = default_dev_attrs,
 318         .drv_attrs = default_drv_attrs,
 319 };
 320
 321 static void dss_bus_release(struct device *dev)
 322 {
 323         DSSDBG("bus_release\n");
 324 }
 325
 326 static struct device dss_bus = {
 327         .release = dss_bus_release,
 328 };
 329
 330 struct bus_type *dss_get_bus(void)
 331 {
 332         return &dss_bus_type;
 333 }
 334
 335 /* DRIVER */
 336 static int dss_driver_probe(struct device *dev)
 337 {
 338         int r;
 339         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 340         struct omap_dss_device *dssdev = to_dss_device(dev);
 341
 342         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 343                                 dev_name(dev), dssdev->driver_name,
 344                                 dssdrv->driver.name);
 345
 346         r = dssdrv->probe(dssdev);
 347
 348         if (r) {
 349                 DSSERR("driver probe failed: %d\n", r);
 350                 return r;
 351         }
 352
 353         DSSDBG("probe done for device %s\n", dev_name(dev));
 354
 355         dssdev->driver = dssdrv;
 356
 357         return 0;
 358 }
 359
 360 static int dss_driver_remove(struct device *dev)
 361 {
 362         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 363         struct omap_dss_device *dssdev = to_dss_device(dev);
 364
 365         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 366                         dssdev->driver_name);
 367
 368         dssdrv->remove(dssdev);
 369
 370         dssdev->driver = NULL;
 371
 372         return 0;
 373 }
 374
 375 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 376 {
 377         dssdriver->driver.bus = &dss_bus_type;
 378         dssdriver->driver.probe = dss_driver_probe;
 379         dssdriver->driver.remove = dss_driver_remove;
 380
 381         if (dssdriver->get_resolution == NULL)
 382                 dssdriver->get_resolution = omapdss_default_get_resolution;
 383         if (dssdriver->get_recommended_bpp == NULL)
 384                 dssdriver->get_recommended_bpp =
 385                         omapdss_default_get_recommended_bpp;
 386         if (dssdriver->get_timings == NULL)
 387                 dssdriver->get_timings = omapdss_default_get_timings;
 388
 389         return driver_register(&dssdriver->driver);
 390 }
 391 EXPORT_SYMBOL(omap_dss_register_driver);
 392
 393 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 394 {
 395         driver_unregister(&dssdriver->driver);
 396 }
 397 EXPORT_SYMBOL(omap_dss_unregister_driver);
 398
 399 /* DEVICE */
 400
 401 static void omap_dss_dev_release(struct device *dev)
 402 {
 403         struct omap_dss_device *dssdev = to_dss_device(dev);
 404         kfree(dssdev);
 405 }
 406
 407 static int disp_num_counter;
 408
 409 struct omap_dss_device *dss_alloc_and_init_device(struct device *parent)
 410 {
 411         struct omap_dss_device *dssdev;
 412
 413         dssdev = kzalloc(sizeof(*dssdev), GFP_KERNEL);
 414         if (!dssdev)
 415                 return NULL;
 416
 417         dssdev->dev.bus = &dss_bus_type;
 418         dssdev->dev.parent = parent;
 419         dssdev->dev.release = omap_dss_dev_release;
 420         dev_set_name(&dssdev->dev, "display%d", disp_num_counter++);
 421
 422         device_initialize(&dssdev->dev);
 423
 424         return dssdev;
 425 }
 426
 427 int dss_add_device(struct omap_dss_device *dssdev)
 428 {
 429         return device_add(&dssdev->dev);
 430 }
 431
 432 void dss_put_device(struct omap_dss_device *dssdev)
 433 {
 434         put_device(&dssdev->dev);
 435 }
 436
 437 void dss_unregister_device(struct omap_dss_device *dssdev)
 438 {
 439         device_unregister(&dssdev->dev);
 440 }
 441
 442 static int dss_unregister_dss_dev(struct device *dev, void *data)
 443 {
 444         struct omap_dss_device *dssdev = to_dss_device(dev);
 445         dss_unregister_device(dssdev);
 446         return 0;
 447 }
 448
 449 void dss_unregister_child_devices(struct device *parent)
 450 {
 451         device_for_each_child(parent, NULL, dss_unregister_dss_dev);
 452 }
 453
 454 void dss_copy_device_pdata(struct omap_dss_device *dst,
 455                 const struct omap_dss_device *src)
 456 {
 457         u8 *d = (u8 *)dst;
 458         u8 *s = (u8 *)src;
 459         size_t dsize = sizeof(struct device);
 460
 461         memcpy(d + dsize, s + dsize, sizeof(struct omap_dss_device) - dsize);
 462 }
 463
 464 /* BUS */
 465 static int __init omap_dss_bus_register(void)
 466 {
 467         int r;
 468
 469         r = bus_register(&dss_bus_type);
 470         if (r) {
 471                 DSSERR("bus register failed\n");
 472                 return r;
 473         }
 474
 475         dev_set_name(&dss_bus, "omapdss");
 476         r = device_register(&dss_bus);
 477         if (r) {
 478                 DSSERR("bus driver register failed\n");
 479                 bus_unregister(&dss_bus_type);
 480                 return r;
 481         }
 482
 483         return 0;
 484 }
 485
 486 /* INIT */
 487 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
 488 #ifdef CONFIG_OMAP2_DSS_DSI
 489         dsi_init_platform_driver,
 490 #endif
 491 #ifdef CONFIG_OMAP2_DSS_DPI
 492         dpi_init_platform_driver,
 493 #endif
 494 #ifdef CONFIG_OMAP2_DSS_SDI
 495         sdi_init_platform_driver,
 496 #endif
 497 #ifdef CONFIG_OMAP2_DSS_RFBI
 498         rfbi_init_platform_driver,
 499 #endif
 500 #ifdef CONFIG_OMAP2_DSS_VENC
 501         venc_init_platform_driver,
 502 #endif
 503 #ifdef CONFIG_OMAP4_DSS_HDMI
 504         hdmi_init_platform_driver,
 505 #endif
 506 };
 507
 508 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
 509 #ifdef CONFIG_OMAP2_DSS_DSI
 510         dsi_uninit_platform_driver,
 511 #endif
 512 #ifdef CONFIG_OMAP2_DSS_DPI
 513         dpi_uninit_platform_driver,
 514 #endif
 515 #ifdef CONFIG_OMAP2_DSS_SDI
 516         sdi_uninit_platform_driver,
 517 #endif
 518 #ifdef CONFIG_OMAP2_DSS_RFBI
 519         rfbi_uninit_platform_driver,
 520 #endif
 521 #ifdef CONFIG_OMAP2_DSS_VENC
 522         venc_uninit_platform_driver,
 523 #endif
 524 #ifdef CONFIG_OMAP4_DSS_HDMI
 525         hdmi_uninit_platform_driver,
 526 #endif
 527 };
 528
 529 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
 530
 531 static int __init omap_dss_register_drivers(void)
 532 {
 533         int r;
 534         int i;
 535
 536         r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
 537         if (r)
 538                 return r;
 539
 540         r = dss_init_platform_driver();
 541         if (r) {
 542                 DSSERR("Failed to initialize DSS platform driver\n");
 543                 goto err_dss;
 544         }
 545
 546         r = dispc_init_platform_driver();
 547         if (r) {
 548                 DSSERR("Failed to initialize dispc platform driver\n");
 549                 goto err_dispc;
 550         }
 551
 552         /*
 553          * It's ok if the output-driver register fails. It happens, for example,
 554          * when there is no output-device (e.g. SDI for OMAP4).
 555          */
 556         for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
 557                 r = dss_output_drv_reg_funcs[i]();
 558                 if (r == 0)
 559                         dss_output_drv_loaded[i] = true;
 560         }
 561
 562         return 0;
 563
 564 err_dispc:
 565         dss_uninit_platform_driver();
 566 err_dss:
 567         platform_driver_unregister(&omap_dss_driver);
 568
 569         return r;
 570 }
 571
 572 static void __exit omap_dss_unregister_drivers(void)
 573 {
 574         int i;
 575
 576         for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
 577                 if (dss_output_drv_loaded[i])
 578                         dss_output_drv_unreg_funcs[i]();
 579         }
 580
 581         dispc_uninit_platform_driver();
 582         dss_uninit_platform_driver();
 583
 584         platform_driver_unregister(&omap_dss_driver);
 585 }
 586
 587 #ifdef CONFIG_OMAP2_DSS_MODULE
 588 static void omap_dss_bus_unregister(void)
 589 {
 590         device_unregister(&dss_bus);
 591
 592         bus_unregister(&dss_bus_type);
 593 }
 594
 595 static int __init omap_dss_init(void)
 596 {
 597         int r;
 598
 599         r = omap_dss_bus_register();
 600         if (r)
 601                 return r;
 602
 603         r = omap_dss_register_drivers();
 604         if (r) {
 605                 omap_dss_bus_unregister();
 606                 return r;
 607         }
 608
 609         return 0;
 610 }
 611
 612 static void __exit omap_dss_exit(void)
 613 {
 614         if (core.vdds_dsi_reg != NULL) {
 615                 regulator_put(core.vdds_dsi_reg);
 616                 core.vdds_dsi_reg = NULL;
 617         }
 618
 619         if (core.vdds_sdi_reg != NULL) {
 620                 regulator_put(core.vdds_sdi_reg);
 621                 core.vdds_sdi_reg = NULL;
 622         }
 623
 624         omap_dss_unregister_drivers();
 625
 626         omap_dss_bus_unregister();
 627 }
 628
 629 module_init(omap_dss_init);
 630 module_exit(omap_dss_exit);
 631 #else
 632 static int __init omap_dss_init(void)
 633 {
 634         return omap_dss_bus_register();
 635 }
 636
 637 static int __init omap_dss_init2(void)
 638 {
 639         return omap_dss_register_drivers();
 640 }
 641
 642 core_initcall(omap_dss_init);
 643 device_initcall(omap_dss_init2);
 644 #endif
 645
 646 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 647 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 648 MODULE_LICENSE("GPL v2");
 649