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
  37 #include <video/omapdss.h>
  38
  39 #include "dss.h"
  40 #include "dss_features.h"
  41
  42 static struct {
  43         struct platform_device *pdev;
  44
  45         struct regulator *vdds_dsi_reg;
  46         struct regulator *vdds_sdi_reg;
  47
  48         const char *default_display_name;
  49 } core;
  50
  51 static char *def_disp_name;
  52 module_param_named(def_disp, def_disp_name, charp, 0);
  53 MODULE_PARM_DESC(def_disp, "default display name");
  54
  55 #ifdef DEBUG
  56 bool dss_debug;
  57 module_param_named(debug, dss_debug, bool, 0644);
  58 #endif
  59
  60 /* REGULATORS */
  61
  62 struct regulator *dss_get_vdds_dsi(void)
  63 {
  64         struct regulator *reg;
  65
  66         if (core.vdds_dsi_reg != NULL)
  67                 return core.vdds_dsi_reg;
  68
  69         reg = regulator_get(&core.pdev->dev, "vdds_dsi");
  70         if (!IS_ERR(reg))
  71                 core.vdds_dsi_reg = reg;
  72
  73         return reg;
  74 }
  75
  76 struct regulator *dss_get_vdds_sdi(void)
  77 {
  78         struct regulator *reg;
  79
  80         if (core.vdds_sdi_reg != NULL)
  81                 return core.vdds_sdi_reg;
  82
  83         reg = regulator_get(&core.pdev->dev, "vdds_sdi");
  84         if (!IS_ERR(reg))
  85                 core.vdds_sdi_reg = reg;
  86
  87         return reg;
  88 }
  89
  90 int dss_get_ctx_loss_count(struct device *dev)
  91 {
  92         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
  93         int cnt;
  94
  95         if (!board_data->get_context_loss_count)
  96                 return -ENOENT;
  97
  98         cnt = board_data->get_context_loss_count(dev);
  99
 100         WARN_ONCE(cnt < 0, "get_context_loss_count failed: %d\n", cnt);
 101
 102         return cnt;
 103 }
 104
 105 int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
 106 {
 107         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
 108
 109         if (!board_data->dsi_enable_pads)
 110                 return -ENOENT;
 111
 112         return board_data->dsi_enable_pads(dsi_id, lane_mask);
 113 }
 114
 115 void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
 116 {
 117         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
 118
 119         if (!board_data->dsi_enable_pads)
 120                 return;
 121
 122         return board_data->dsi_disable_pads(dsi_id, lane_mask);
 123 }
 124
 125 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
 126 {
 127         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 128
 129         if (pdata->set_min_bus_tput)
 130                 return pdata->set_min_bus_tput(dev, tput);
 131         else
 132                 return 0;
 133 }
 134
 135 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_OMAP2_DSS_DEBUG_SUPPORT)
 136 static int dss_debug_show(struct seq_file *s, void *unused)
 137 {
 138         void (*func)(struct seq_file *) = s->private;
 139         func(s);
 140         return 0;
 141 }
 142
 143 static int dss_debug_open(struct inode *inode, struct file *file)
 144 {
 145         return single_open(file, dss_debug_show, inode->i_private);
 146 }
 147
 148 static const struct file_operations dss_debug_fops = {
 149         .open           = dss_debug_open,
 150         .read           = seq_read,
 151         .llseek         = seq_lseek,
 152         .release        = single_release,
 153 };
 154
 155 static struct dentry *dss_debugfs_dir;
 156
 157 static int dss_initialize_debugfs(void)
 158 {
 159         dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
 160         if (IS_ERR(dss_debugfs_dir)) {
 161                 int err = PTR_ERR(dss_debugfs_dir);
 162                 dss_debugfs_dir = NULL;
 163                 return err;
 164         }
 165
 166         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
 167                         &dss_debug_dump_clocks, &dss_debug_fops);
 168
 169         return 0;
 170 }
 171
 172 static void dss_uninitialize_debugfs(void)
 173 {
 174         if (dss_debugfs_dir)
 175                 debugfs_remove_recursive(dss_debugfs_dir);
 176 }
 177
 178 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 179 {
 180         struct dentry *d;
 181
 182         d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
 183                         write, &dss_debug_fops);
 184
 185         if (IS_ERR(d))
 186                 return PTR_ERR(d);
 187
 188         return 0;
 189 }
 190 #else /* CONFIG_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
 191 static inline int dss_initialize_debugfs(void)
 192 {
 193         return 0;
 194 }
 195 static inline void dss_uninitialize_debugfs(void)
 196 {
 197 }
 198 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 199 {
 200         return 0;
 201 }
 202 #endif /* CONFIG_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
 203
 204 /* PLATFORM DEVICE */
 205 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
 206 {
 207         DSSDBG("pm notif %lu\n", v);
 208
 209         switch (v) {
 210         case PM_SUSPEND_PREPARE:
 211                 DSSDBG("suspending displays\n");
 212                 return dss_suspend_all_devices();
 213
 214         case PM_POST_SUSPEND:
 215                 DSSDBG("resuming displays\n");
 216                 return dss_resume_all_devices();
 217
 218         default:
 219                 return 0;
 220         }
 221 }
 222
 223 static struct notifier_block omap_dss_pm_notif_block = {
 224         .notifier_call = omap_dss_pm_notif,
 225 };
 226
 227 static int __init omap_dss_probe(struct platform_device *pdev)
 228 {
 229         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 230         int r;
 231
 232         core.pdev = pdev;
 233
 234         dss_features_init();
 235
 236         dss_apply_init();
 237
 238         dss_init_overlay_managers(pdev);
 239         dss_init_overlays(pdev);
 240
 241         r = dss_initialize_debugfs();
 242         if (r)
 243                 goto err_debugfs;
 244
 245         if (def_disp_name)
 246                 core.default_display_name = def_disp_name;
 247         else if (pdata->default_device)
 248                 core.default_display_name = pdata->default_device->name;
 249
 250         register_pm_notifier(&omap_dss_pm_notif_block);
 251
 252         return 0;
 253
 254 err_debugfs:
 255
 256         return r;
 257 }
 258
 259 static int omap_dss_remove(struct platform_device *pdev)
 260 {
 261         unregister_pm_notifier(&omap_dss_pm_notif_block);
 262
 263         dss_uninitialize_debugfs();
 264
 265         dss_uninit_overlays(pdev);
 266         dss_uninit_overlay_managers(pdev);
 267
 268         return 0;
 269 }
 270
 271 static void omap_dss_shutdown(struct platform_device *pdev)
 272 {
 273         DSSDBG("shutdown\n");
 274         dss_disable_all_devices();
 275 }
 276
 277 static struct platform_driver omap_dss_driver = {
 278         .remove         = omap_dss_remove,
 279         .shutdown       = omap_dss_shutdown,
 280         .driver         = {
 281                 .name   = "omapdss",
 282                 .owner  = THIS_MODULE,
 283         },
 284 };
 285
 286 /* BUS */
 287 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 288 {
 289         struct omap_dss_device *dssdev = to_dss_device(dev);
 290
 291         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 292                         dev_name(dev), dssdev->driver_name, driver->name);
 293
 294         return strcmp(dssdev->driver_name, driver->name) == 0;
 295 }
 296
 297 static ssize_t device_name_show(struct device *dev,
 298                 struct device_attribute *attr, char *buf)
 299 {
 300         struct omap_dss_device *dssdev = to_dss_device(dev);
 301         return snprintf(buf, PAGE_SIZE, "%s\n",
 302                         dssdev->name ?
 303                         dssdev->name : "");
 304 }
 305
 306 static struct device_attribute default_dev_attrs[] = {
 307         __ATTR(name, S_IRUGO, device_name_show, NULL),
 308         __ATTR_NULL,
 309 };
 310
 311 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 312 {
 313         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 314         return snprintf(buf, PAGE_SIZE, "%s\n",
 315                         dssdrv->driver.name ?
 316                         dssdrv->driver.name : "");
 317 }
 318 static struct driver_attribute default_drv_attrs[] = {
 319         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 320         __ATTR_NULL,
 321 };
 322
 323 static struct bus_type dss_bus_type = {
 324         .name = "omapdss",
 325         .match = dss_bus_match,
 326         .dev_attrs = default_dev_attrs,
 327         .drv_attrs = default_drv_attrs,
 328 };
 329
 330 static void dss_bus_release(struct device *dev)
 331 {
 332         DSSDBG("bus_release\n");
 333 }
 334
 335 static struct device dss_bus = {
 336         .release = dss_bus_release,
 337 };
 338
 339 struct bus_type *dss_get_bus(void)
 340 {
 341         return &dss_bus_type;
 342 }
 343
 344 /* DRIVER */
 345 static int dss_driver_probe(struct device *dev)
 346 {
 347         int r;
 348         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 349         struct omap_dss_device *dssdev = to_dss_device(dev);
 350         bool force;
 351
 352         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 353                                 dev_name(dev), dssdev->driver_name,
 354                                 dssdrv->driver.name);
 355
 356         dss_init_device(core.pdev, dssdev);
 357
 358         force = core.default_display_name &&
 359                 strcmp(core.default_display_name, dssdev->name) == 0;
 360         dss_recheck_connections(dssdev, force);
 361
 362         r = dssdrv->probe(dssdev);
 363
 364         if (r) {
 365                 DSSERR("driver probe failed: %d\n", r);
 366                 dss_uninit_device(core.pdev, dssdev);
 367                 return r;
 368         }
 369
 370         DSSDBG("probe done for device %s\n", dev_name(dev));
 371
 372         dssdev->driver = dssdrv;
 373
 374         return 0;
 375 }
 376
 377 static int dss_driver_remove(struct device *dev)
 378 {
 379         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 380         struct omap_dss_device *dssdev = to_dss_device(dev);
 381
 382         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 383                         dssdev->driver_name);
 384
 385         dssdrv->remove(dssdev);
 386
 387         dss_uninit_device(core.pdev, dssdev);
 388
 389         dssdev->driver = NULL;
 390
 391         return 0;
 392 }
 393
 394 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 395 {
 396         dssdriver->driver.bus = &dss_bus_type;
 397         dssdriver->driver.probe = dss_driver_probe;
 398         dssdriver->driver.remove = dss_driver_remove;
 399
 400         if (dssdriver->get_resolution == NULL)
 401                 dssdriver->get_resolution = omapdss_default_get_resolution;
 402         if (dssdriver->get_recommended_bpp == NULL)
 403                 dssdriver->get_recommended_bpp =
 404                         omapdss_default_get_recommended_bpp;
 405         if (dssdriver->get_timings == NULL)
 406                 dssdriver->get_timings = omapdss_default_get_timings;
 407
 408         return driver_register(&dssdriver->driver);
 409 }
 410 EXPORT_SYMBOL(omap_dss_register_driver);
 411
 412 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 413 {
 414         driver_unregister(&dssdriver->driver);
 415 }
 416 EXPORT_SYMBOL(omap_dss_unregister_driver);
 417
 418 /* DEVICE */
 419 static void reset_device(struct device *dev, int check)
 420 {
 421         u8 *dev_p = (u8 *)dev;
 422         u8 *dev_end = dev_p + sizeof(*dev);
 423         void *saved_pdata;
 424
 425         saved_pdata = dev->platform_data;
 426         if (check) {
 427                 /*
 428                  * Check if there is any other setting than platform_data
 429                  * in struct device; warn that these will be reset by our
 430                  * init.
 431                  */
 432                 dev->platform_data = NULL;
 433                 while (dev_p < dev_end) {
 434                         if (*dev_p) {
 435                                 WARN("%s: struct device fields will be "
 436                                                 "discarded\n",
 437                                      __func__);
 438                                 break;
 439                         }
 440                         dev_p++;
 441                 }
 442         }
 443         memset(dev, 0, sizeof(*dev));
 444         dev->platform_data = saved_pdata;
 445 }
 446
 447
 448 static void omap_dss_dev_release(struct device *dev)
 449 {
 450         reset_device(dev, 0);
 451 }
 452
 453 int omap_dss_register_device(struct omap_dss_device *dssdev,
 454                 struct device *parent, int disp_num)
 455 {
 456         WARN_ON(!dssdev->driver_name);
 457
 458         reset_device(&dssdev->dev, 1);
 459         dssdev->dev.bus = &dss_bus_type;
 460         dssdev->dev.parent = parent;
 461         dssdev->dev.release = omap_dss_dev_release;
 462         dev_set_name(&dssdev->dev, "display%d", disp_num);
 463         return device_register(&dssdev->dev);
 464 }
 465
 466 void omap_dss_unregister_device(struct omap_dss_device *dssdev)
 467 {
 468         device_unregister(&dssdev->dev);
 469 }
 470
 471 static int dss_unregister_dss_dev(struct device *dev, void *data)
 472 {
 473         struct omap_dss_device *dssdev = to_dss_device(dev);
 474         omap_dss_unregister_device(dssdev);
 475         return 0;
 476 }
 477
 478 void omap_dss_unregister_child_devices(struct device *parent)
 479 {
 480         device_for_each_child(parent, NULL, dss_unregister_dss_dev);
 481 }
 482
 483 /* BUS */
 484 static int __init omap_dss_bus_register(void)
 485 {
 486         int r;
 487
 488         r = bus_register(&dss_bus_type);
 489         if (r) {
 490                 DSSERR("bus register failed\n");
 491                 return r;
 492         }
 493
 494         dev_set_name(&dss_bus, "omapdss");
 495         r = device_register(&dss_bus);
 496         if (r) {
 497                 DSSERR("bus driver register failed\n");
 498                 bus_unregister(&dss_bus_type);
 499                 return r;
 500         }
 501
 502         return 0;
 503 }
 504
 505 /* INIT */
 506 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
 507 #ifdef CONFIG_OMAP2_DSS_DPI
 508         dpi_init_platform_driver,
 509 #endif
 510 #ifdef CONFIG_OMAP2_DSS_SDI
 511         sdi_init_platform_driver,
 512 #endif
 513 #ifdef CONFIG_OMAP2_DSS_RFBI
 514         rfbi_init_platform_driver,
 515 #endif
 516 #ifdef CONFIG_OMAP2_DSS_VENC
 517         venc_init_platform_driver,
 518 #endif
 519 #ifdef CONFIG_OMAP2_DSS_DSI
 520         dsi_init_platform_driver,
 521 #endif
 522 #ifdef CONFIG_OMAP4_DSS_HDMI
 523         hdmi_init_platform_driver,
 524 #endif
 525 };
 526
 527 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
 528 #ifdef CONFIG_OMAP2_DSS_DPI
 529         dpi_uninit_platform_driver,
 530 #endif
 531 #ifdef CONFIG_OMAP2_DSS_SDI
 532         sdi_uninit_platform_driver,
 533 #endif
 534 #ifdef CONFIG_OMAP2_DSS_RFBI
 535         rfbi_uninit_platform_driver,
 536 #endif
 537 #ifdef CONFIG_OMAP2_DSS_VENC
 538         venc_uninit_platform_driver,
 539 #endif
 540 #ifdef CONFIG_OMAP2_DSS_DSI
 541         dsi_uninit_platform_driver,
 542 #endif
 543 #ifdef CONFIG_OMAP4_DSS_HDMI
 544         hdmi_uninit_platform_driver,
 545 #endif
 546 };
 547
 548 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
 549
 550 static int __init omap_dss_register_drivers(void)
 551 {
 552         int r;
 553         int i;
 554
 555         r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
 556         if (r)
 557                 return r;
 558
 559         r = dss_init_platform_driver();
 560         if (r) {
 561                 DSSERR("Failed to initialize DSS platform driver\n");
 562                 goto err_dss;
 563         }
 564
 565         r = dispc_init_platform_driver();
 566         if (r) {
 567                 DSSERR("Failed to initialize dispc platform driver\n");
 568                 goto err_dispc;
 569         }
 570
 571         /*
 572          * It's ok if the output-driver register fails. It happens, for example,
 573          * when there is no output-device (e.g. SDI for OMAP4).
 574          */
 575         for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
 576                 r = dss_output_drv_reg_funcs[i]();
 577                 if (r == 0)
 578                         dss_output_drv_loaded[i] = true;
 579         }
 580
 581         return 0;
 582
 583 err_dispc:
 584         dss_uninit_platform_driver();
 585 err_dss:
 586         platform_driver_unregister(&omap_dss_driver);
 587
 588         return r;
 589 }
 590
 591 static void __exit omap_dss_unregister_drivers(void)
 592 {
 593         int i;
 594
 595         for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
 596                 if (dss_output_drv_loaded[i])
 597                         dss_output_drv_unreg_funcs[i]();
 598         }
 599
 600         dispc_uninit_platform_driver();
 601         dss_uninit_platform_driver();
 602
 603         platform_driver_unregister(&omap_dss_driver);
 604 }
 605
 606 #ifdef CONFIG_OMAP2_DSS_MODULE
 607 static void omap_dss_bus_unregister(void)
 608 {
 609         device_unregister(&dss_bus);
 610
 611         bus_unregister(&dss_bus_type);
 612 }
 613
 614 static int __init omap_dss_init(void)
 615 {
 616         int r;
 617
 618         r = omap_dss_bus_register();
 619         if (r)
 620                 return r;
 621
 622         r = omap_dss_register_drivers();
 623         if (r) {
 624                 omap_dss_bus_unregister();
 625                 return r;
 626         }
 627
 628         return 0;
 629 }
 630
 631 static void __exit omap_dss_exit(void)
 632 {
 633         if (core.vdds_dsi_reg != NULL) {
 634                 regulator_put(core.vdds_dsi_reg);
 635                 core.vdds_dsi_reg = NULL;
 636         }
 637
 638         if (core.vdds_sdi_reg != NULL) {
 639                 regulator_put(core.vdds_sdi_reg);
 640                 core.vdds_sdi_reg = NULL;
 641         }
 642
 643         omap_dss_unregister_drivers();
 644
 645         omap_dss_bus_unregister();
 646 }
 647
 648 module_init(omap_dss_init);
 649 module_exit(omap_dss_exit);
 650 #else
 651 static int __init omap_dss_init(void)
 652 {
 653         return omap_dss_bus_register();
 654 }
 655
 656 static int __init omap_dss_init2(void)
 657 {
 658         return omap_dss_register_drivers();
 659 }
 660
 661 core_initcall(omap_dss_init);
 662 device_initcall(omap_dss_init2);
 663 #endif
 664
 665 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 666 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 667 MODULE_LICENSE("GPL v2");
 668