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 static bool dss_initialized;
  57
  58 const char *omapdss_get_default_display_name(void)
  59 {
  60         return core.default_display_name;
  61 }
  62 EXPORT_SYMBOL(omapdss_get_default_display_name);
  63
  64 enum omapdss_version omapdss_get_version(void)
  65 {
  66         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
  67         return pdata->version;
  68 }
  69 EXPORT_SYMBOL(omapdss_get_version);
  70
  71 bool omapdss_is_initialized(void)
  72 {
  73         return dss_initialized;
  74 }
  75 EXPORT_SYMBOL(omapdss_is_initialized);
  76
  77 struct platform_device *dss_get_core_pdev(void)
  78 {
  79         return core.pdev;
  80 }
  81
  82 /* REGULATORS */
  83
  84 struct regulator *dss_get_vdds_dsi(void)
  85 {
  86         struct regulator *reg;
  87
  88         if (core.vdds_dsi_reg != NULL)
  89                 return core.vdds_dsi_reg;
  90
  91         reg = regulator_get(&core.pdev->dev, "vdds_dsi");
  92         if (!IS_ERR(reg))
  93                 core.vdds_dsi_reg = reg;
  94
  95         return reg;
  96 }
  97
  98 struct regulator *dss_get_vdds_sdi(void)
  99 {
 100         struct regulator *reg;
 101
 102         if (core.vdds_sdi_reg != NULL)
 103                 return core.vdds_sdi_reg;
 104
 105         reg = regulator_get(&core.pdev->dev, "vdds_sdi");
 106         if (!IS_ERR(reg))
 107                 core.vdds_sdi_reg = reg;
 108
 109         return reg;
 110 }
 111
 112 int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
 113 {
 114         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
 115
 116         if (!board_data->dsi_enable_pads)
 117                 return -ENOENT;
 118
 119         return board_data->dsi_enable_pads(dsi_id, lane_mask);
 120 }
 121
 122 void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
 123 {
 124         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
 125
 126         if (!board_data->dsi_disable_pads)
 127                 return;
 128
 129         return board_data->dsi_disable_pads(dsi_id, lane_mask);
 130 }
 131
 132 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
 133 {
 134         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 135
 136         if (pdata->set_min_bus_tput)
 137                 return pdata->set_min_bus_tput(dev, tput);
 138         else
 139                 return 0;
 140 }
 141
 142 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
 143 static int dss_debug_show(struct seq_file *s, void *unused)
 144 {
 145         void (*func)(struct seq_file *) = s->private;
 146         func(s);
 147         return 0;
 148 }
 149
 150 static int dss_debug_open(struct inode *inode, struct file *file)
 151 {
 152         return single_open(file, dss_debug_show, inode->i_private);
 153 }
 154
 155 static const struct file_operations dss_debug_fops = {
 156         .open           = dss_debug_open,
 157         .read           = seq_read,
 158         .llseek         = seq_lseek,
 159         .release        = single_release,
 160 };
 161
 162 static struct dentry *dss_debugfs_dir;
 163
 164 static int dss_initialize_debugfs(void)
 165 {
 166         dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
 167         if (IS_ERR(dss_debugfs_dir)) {
 168                 int err = PTR_ERR(dss_debugfs_dir);
 169                 dss_debugfs_dir = NULL;
 170                 return err;
 171         }
 172
 173         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
 174                         &dss_debug_dump_clocks, &dss_debug_fops);
 175
 176         return 0;
 177 }
 178
 179 static void dss_uninitialize_debugfs(void)
 180 {
 181         if (dss_debugfs_dir)
 182                 debugfs_remove_recursive(dss_debugfs_dir);
 183 }
 184
 185 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 186 {
 187         struct dentry *d;
 188
 189         d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
 190                         write, &dss_debug_fops);
 191
 192         return PTR_RET(d);
 193 }
 194 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
 195 static inline int dss_initialize_debugfs(void)
 196 {
 197         return 0;
 198 }
 199 static inline void dss_uninitialize_debugfs(void)
 200 {
 201 }
 202 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 203 {
 204         return 0;
 205 }
 206 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
 207
 208 /* PLATFORM DEVICE */
 209 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
 210 {
 211         DSSDBG("pm notif %lu\n", v);
 212
 213         switch (v) {
 214         case PM_SUSPEND_PREPARE:
 215                 DSSDBG("suspending displays\n");
 216                 return dss_suspend_all_devices();
 217
 218         case PM_POST_SUSPEND:
 219                 DSSDBG("resuming displays\n");
 220                 return dss_resume_all_devices();
 221
 222         default:
 223                 return 0;
 224         }
 225 }
 226
 227 static struct notifier_block omap_dss_pm_notif_block = {
 228         .notifier_call = omap_dss_pm_notif,
 229 };
 230
 231 static int __init omap_dss_probe(struct platform_device *pdev)
 232 {
 233         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 234         int r;
 235
 236         core.pdev = pdev;
 237
 238         dss_features_init(omapdss_get_version());
 239
 240         r = dss_initialize_debugfs();
 241         if (r)
 242                 goto err_debugfs;
 243
 244         if (def_disp_name)
 245                 core.default_display_name = def_disp_name;
 246         else if (pdata->default_device)
 247                 core.default_display_name = pdata->default_device->name;
 248
 249         register_pm_notifier(&omap_dss_pm_notif_block);
 250
 251         return 0;
 252
 253 err_debugfs:
 254
 255         return r;
 256 }
 257
 258 static int omap_dss_remove(struct platform_device *pdev)
 259 {
 260         unregister_pm_notifier(&omap_dss_pm_notif_block);
 261
 262         dss_uninitialize_debugfs();
 263
 264         return 0;
 265 }
 266
 267 static void omap_dss_shutdown(struct platform_device *pdev)
 268 {
 269         DSSDBG("shutdown\n");
 270         dss_disable_all_devices();
 271 }
 272
 273 static struct platform_driver omap_dss_driver = {
 274         .remove         = omap_dss_remove,
 275         .shutdown       = omap_dss_shutdown,
 276         .driver         = {
 277                 .name   = "omapdss",
 278                 .owner  = THIS_MODULE,
 279         },
 280 };
 281
 282 /* BUS */
 283 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 284 {
 285         struct omap_dss_device *dssdev = to_dss_device(dev);
 286
 287         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 288                         dev_name(dev), dssdev->driver_name, driver->name);
 289
 290         return strcmp(dssdev->driver_name, driver->name) == 0;
 291 }
 292
 293 static ssize_t device_name_show(struct device *dev,
 294                 struct device_attribute *attr, char *buf)
 295 {
 296         struct omap_dss_device *dssdev = to_dss_device(dev);
 297         return snprintf(buf, PAGE_SIZE, "%s\n",
 298                         dssdev->name ?
 299                         dssdev->name : "");
 300 }
 301
 302 static struct device_attribute default_dev_attrs[] = {
 303         __ATTR(name, S_IRUGO, device_name_show, NULL),
 304         __ATTR_NULL,
 305 };
 306
 307 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 308 {
 309         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 310         return snprintf(buf, PAGE_SIZE, "%s\n",
 311                         dssdrv->driver.name ?
 312                         dssdrv->driver.name : "");
 313 }
 314 static struct driver_attribute default_drv_attrs[] = {
 315         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 316         __ATTR_NULL,
 317 };
 318
 319 static struct bus_type dss_bus_type = {
 320         .name = "omapdss",
 321         .match = dss_bus_match,
 322         .dev_attrs = default_dev_attrs,
 323         .drv_attrs = default_drv_attrs,
 324 };
 325
 326 static void dss_bus_release(struct device *dev)
 327 {
 328         DSSDBG("bus_release\n");
 329 }
 330
 331 static struct device dss_bus = {
 332         .release = dss_bus_release,
 333 };
 334
 335 struct bus_type *dss_get_bus(void)
 336 {
 337         return &dss_bus_type;
 338 }
 339
 340 /* DRIVER */
 341 static int dss_driver_probe(struct device *dev)
 342 {
 343         int r;
 344         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 345         struct omap_dss_device *dssdev = to_dss_device(dev);
 346
 347         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 348                                 dev_name(dev), dssdev->driver_name,
 349                                 dssdrv->driver.name);
 350
 351         r = dssdrv->probe(dssdev);
 352
 353         if (r) {
 354                 DSSERR("driver probe failed: %d\n", r);
 355                 return r;
 356         }
 357
 358         DSSDBG("probe done for device %s\n", dev_name(dev));
 359
 360         dssdev->driver = dssdrv;
 361
 362         return 0;
 363 }
 364
 365 static int dss_driver_remove(struct device *dev)
 366 {
 367         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 368         struct omap_dss_device *dssdev = to_dss_device(dev);
 369
 370         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 371                         dssdev->driver_name);
 372
 373         dssdrv->remove(dssdev);
 374
 375         dssdev->driver = NULL;
 376
 377         return 0;
 378 }
 379
 380 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 381 {
 382         dssdriver->driver.bus = &dss_bus_type;
 383         dssdriver->driver.probe = dss_driver_probe;
 384         dssdriver->driver.remove = dss_driver_remove;
 385
 386         if (dssdriver->get_resolution == NULL)
 387                 dssdriver->get_resolution = omapdss_default_get_resolution;
 388         if (dssdriver->get_recommended_bpp == NULL)
 389                 dssdriver->get_recommended_bpp =
 390                         omapdss_default_get_recommended_bpp;
 391         if (dssdriver->get_timings == NULL)
 392                 dssdriver->get_timings = omapdss_default_get_timings;
 393
 394         return driver_register(&dssdriver->driver);
 395 }
 396 EXPORT_SYMBOL(omap_dss_register_driver);
 397
 398 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 399 {
 400         driver_unregister(&dssdriver->driver);
 401 }
 402 EXPORT_SYMBOL(omap_dss_unregister_driver);
 403
 404 /* DEVICE */
 405
 406 static void omap_dss_dev_release(struct device *dev)
 407 {
 408         struct omap_dss_device *dssdev = to_dss_device(dev);
 409         kfree(dssdev);
 410 }
 411
 412 static int disp_num_counter;
 413
 414 struct omap_dss_device *dss_alloc_and_init_device(struct device *parent)
 415 {
 416         struct omap_dss_device *dssdev;
 417
 418         dssdev = kzalloc(sizeof(*dssdev), GFP_KERNEL);
 419         if (!dssdev)
 420                 return NULL;
 421
 422         dssdev->dev.bus = &dss_bus_type;
 423         dssdev->dev.parent = parent;
 424         dssdev->dev.release = omap_dss_dev_release;
 425         dev_set_name(&dssdev->dev, "display%d", disp_num_counter++);
 426
 427         device_initialize(&dssdev->dev);
 428
 429         return dssdev;
 430 }
 431
 432 int dss_add_device(struct omap_dss_device *dssdev)
 433 {
 434         return device_add(&dssdev->dev);
 435 }
 436
 437 void dss_put_device(struct omap_dss_device *dssdev)
 438 {
 439         put_device(&dssdev->dev);
 440 }
 441
 442 void dss_unregister_device(struct omap_dss_device *dssdev)
 443 {
 444         device_unregister(&dssdev->dev);
 445 }
 446
 447 static int dss_unregister_dss_dev(struct device *dev, void *data)
 448 {
 449         struct omap_dss_device *dssdev = to_dss_device(dev);
 450         dss_unregister_device(dssdev);
 451         return 0;
 452 }
 453
 454 void dss_unregister_child_devices(struct device *parent)
 455 {
 456         device_for_each_child(parent, NULL, dss_unregister_dss_dev);
 457 }
 458
 459 void dss_copy_device_pdata(struct omap_dss_device *dst,
 460                 const struct omap_dss_device *src)
 461 {
 462         u8 *d = (u8 *)dst;
 463         u8 *s = (u8 *)src;
 464         size_t dsize = sizeof(struct device);
 465
 466         memcpy(d + dsize, s + dsize, sizeof(struct omap_dss_device) - dsize);
 467 }
 468
 469 /* BUS */
 470 static int __init omap_dss_bus_register(void)
 471 {
 472         int r;
 473
 474         r = bus_register(&dss_bus_type);
 475         if (r) {
 476                 DSSERR("bus register failed\n");
 477                 return r;
 478         }
 479
 480         dev_set_name(&dss_bus, "omapdss");
 481         r = device_register(&dss_bus);
 482         if (r) {
 483                 DSSERR("bus driver register failed\n");
 484                 bus_unregister(&dss_bus_type);
 485                 return r;
 486         }
 487
 488         return 0;
 489 }
 490
 491 /* INIT */
 492 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
 493 #ifdef CONFIG_OMAP2_DSS_DSI
 494         dsi_init_platform_driver,
 495 #endif
 496 #ifdef CONFIG_OMAP2_DSS_DPI
 497         dpi_init_platform_driver,
 498 #endif
 499 #ifdef CONFIG_OMAP2_DSS_SDI
 500         sdi_init_platform_driver,
 501 #endif
 502 #ifdef CONFIG_OMAP2_DSS_RFBI
 503         rfbi_init_platform_driver,
 504 #endif
 505 #ifdef CONFIG_OMAP2_DSS_VENC
 506         venc_init_platform_driver,
 507 #endif
 508 #ifdef CONFIG_OMAP4_DSS_HDMI
 509         hdmi_init_platform_driver,
 510 #endif
 511 };
 512
 513 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
 514 #ifdef CONFIG_OMAP2_DSS_DSI
 515         dsi_uninit_platform_driver,
 516 #endif
 517 #ifdef CONFIG_OMAP2_DSS_DPI
 518         dpi_uninit_platform_driver,
 519 #endif
 520 #ifdef CONFIG_OMAP2_DSS_SDI
 521         sdi_uninit_platform_driver,
 522 #endif
 523 #ifdef CONFIG_OMAP2_DSS_RFBI
 524         rfbi_uninit_platform_driver,
 525 #endif
 526 #ifdef CONFIG_OMAP2_DSS_VENC
 527         venc_uninit_platform_driver,
 528 #endif
 529 #ifdef CONFIG_OMAP4_DSS_HDMI
 530         hdmi_uninit_platform_driver,
 531 #endif
 532 };
 533
 534 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
 535
 536 static int __init omap_dss_register_drivers(void)
 537 {
 538         int r;
 539         int i;
 540
 541         r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
 542         if (r)
 543                 return r;
 544
 545         r = dss_init_platform_driver();
 546         if (r) {
 547                 DSSERR("Failed to initialize DSS platform driver\n");
 548                 goto err_dss;
 549         }
 550
 551         r = dispc_init_platform_driver();
 552         if (r) {
 553                 DSSERR("Failed to initialize dispc platform driver\n");
 554                 goto err_dispc;
 555         }
 556
 557         /*
 558          * It's ok if the output-driver register fails. It happens, for example,
 559          * when there is no output-device (e.g. SDI for OMAP4).
 560          */
 561         for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
 562                 r = dss_output_drv_reg_funcs[i]();
 563                 if (r == 0)
 564                         dss_output_drv_loaded[i] = true;
 565         }
 566
 567         return 0;
 568
 569 err_dispc:
 570         dss_uninit_platform_driver();
 571 err_dss:
 572         platform_driver_unregister(&omap_dss_driver);
 573
 574         return r;
 575 }
 576
 577 static void __exit omap_dss_unregister_drivers(void)
 578 {
 579         int i;
 580
 581         for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
 582                 if (dss_output_drv_loaded[i])
 583                         dss_output_drv_unreg_funcs[i]();
 584         }
 585
 586         dispc_uninit_platform_driver();
 587         dss_uninit_platform_driver();
 588
 589         platform_driver_unregister(&omap_dss_driver);
 590 }
 591
 592 #ifdef CONFIG_OMAP2_DSS_MODULE
 593 static void omap_dss_bus_unregister(void)
 594 {
 595         device_unregister(&dss_bus);
 596
 597         bus_unregister(&dss_bus_type);
 598 }
 599
 600 static int __init omap_dss_init(void)
 601 {
 602         int r;
 603
 604         r = omap_dss_bus_register();
 605         if (r)
 606                 return r;
 607
 608         r = omap_dss_register_drivers();
 609         if (r) {
 610                 omap_dss_bus_unregister();
 611                 return r;
 612         }
 613
 614         dss_initialized = true;
 615
 616         return 0;
 617 }
 618
 619 static void __exit omap_dss_exit(void)
 620 {
 621         if (core.vdds_dsi_reg != NULL) {
 622                 regulator_put(core.vdds_dsi_reg);
 623                 core.vdds_dsi_reg = NULL;
 624         }
 625
 626         if (core.vdds_sdi_reg != NULL) {
 627                 regulator_put(core.vdds_sdi_reg);
 628                 core.vdds_sdi_reg = NULL;
 629         }
 630
 631         omap_dss_unregister_drivers();
 632
 633         omap_dss_bus_unregister();
 634 }
 635
 636 module_init(omap_dss_init);
 637 module_exit(omap_dss_exit);
 638 #else
 639 static int __init omap_dss_init(void)
 640 {
 641         return omap_dss_bus_register();
 642 }
 643
 644 static int __init omap_dss_init2(void)
 645 {
 646         int r;
 647
 648         r = omap_dss_register_drivers();
 649         if (r)
 650                 return r;
 651
 652         dss_initialized = true;
 653
 654         return 0;
 655 }
 656
 657 core_initcall(omap_dss_init);
 658 device_initcall(omap_dss_init2);
 659 #endif
 660
 661 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 662 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 663 MODULE_LICENSE("GPL v2");
 664