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
  36 #include <video/omapdss.h>
  37
  38 #include "dss.h"
  39 #include "dss_features.h"
  40
  41 static struct {
  42         struct platform_device *pdev;
  43
  44         struct regulator *vdds_dsi_reg;
  45         struct regulator *vdds_sdi_reg;
  46
  47         const char *default_display_name;
  48 } core;
  49
  50 static char *def_disp_name;
  51 module_param_named(def_disp, def_disp_name, charp, 0);
  52 MODULE_PARM_DESC(def_disp, "default display name");
  53
  54 #ifdef DEBUG
  55 bool dss_debug;
  56 module_param_named(debug, dss_debug, bool, 0644);
  57 #endif
  58
  59 /* REGULATORS */
  60
  61 struct regulator *dss_get_vdds_dsi(void)
  62 {
  63         struct regulator *reg;
  64
  65         if (core.vdds_dsi_reg != NULL)
  66                 return core.vdds_dsi_reg;
  67
  68         reg = regulator_get(&core.pdev->dev, "vdds_dsi");
  69         if (!IS_ERR(reg))
  70                 core.vdds_dsi_reg = reg;
  71
  72         return reg;
  73 }
  74
  75 struct regulator *dss_get_vdds_sdi(void)
  76 {
  77         struct regulator *reg;
  78
  79         if (core.vdds_sdi_reg != NULL)
  80                 return core.vdds_sdi_reg;
  81
  82         reg = regulator_get(&core.pdev->dev, "vdds_sdi");
  83         if (!IS_ERR(reg))
  84                 core.vdds_sdi_reg = reg;
  85
  86         return reg;
  87 }
  88
  89 int dss_get_ctx_loss_count(struct device *dev)
  90 {
  91         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
  92         int cnt;
  93
  94         if (!board_data->get_context_loss_count)
  95                 return -ENOENT;
  96
  97         cnt = board_data->get_context_loss_count(dev);
  98
  99         WARN_ONCE(cnt < 0, "get_context_loss_count failed: %d\n", cnt);
 100
 101         return cnt;
 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_enable_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_DEBUG_FS) && defined(CONFIG_OMAP2_DSS_DEBUG_SUPPORT)
 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_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
 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_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
 202
 203 /* PLATFORM DEVICE */
 204 static int __init omap_dss_probe(struct platform_device *pdev)
 205 {
 206         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 207         int r;
 208
 209         core.pdev = pdev;
 210
 211         dss_features_init();
 212
 213         dss_apply_init();
 214
 215         dss_init_overlay_managers(pdev);
 216         dss_init_overlays(pdev);
 217
 218         r = dss_initialize_debugfs();
 219         if (r)
 220                 goto err_debugfs;
 221
 222         if (def_disp_name)
 223                 core.default_display_name = def_disp_name;
 224         else if (pdata->default_device)
 225                 core.default_display_name = pdata->default_device->name;
 226
 227         return 0;
 228
 229 err_debugfs:
 230
 231         return r;
 232 }
 233
 234 static int omap_dss_remove(struct platform_device *pdev)
 235 {
 236         dss_uninitialize_debugfs();
 237
 238         dss_uninit_overlays(pdev);
 239         dss_uninit_overlay_managers(pdev);
 240
 241         return 0;
 242 }
 243
 244 static void omap_dss_shutdown(struct platform_device *pdev)
 245 {
 246         DSSDBG("shutdown\n");
 247         dss_disable_all_devices();
 248 }
 249
 250 static int omap_dss_suspend(struct platform_device *pdev, pm_message_t state)
 251 {
 252         DSSDBG("suspend %d\n", state.event);
 253
 254         return dss_suspend_all_devices();
 255 }
 256
 257 static int omap_dss_resume(struct platform_device *pdev)
 258 {
 259         DSSDBG("resume\n");
 260
 261         return dss_resume_all_devices();
 262 }
 263
 264 static struct platform_driver omap_dss_driver = {
 265         .remove         = omap_dss_remove,
 266         .shutdown       = omap_dss_shutdown,
 267         .suspend        = omap_dss_suspend,
 268         .resume         = omap_dss_resume,
 269         .driver         = {
 270                 .name   = "omapdss",
 271                 .owner  = THIS_MODULE,
 272         },
 273 };
 274
 275 /* BUS */
 276 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 277 {
 278         struct omap_dss_device *dssdev = to_dss_device(dev);
 279
 280         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 281                         dev_name(dev), dssdev->driver_name, driver->name);
 282
 283         return strcmp(dssdev->driver_name, driver->name) == 0;
 284 }
 285
 286 static ssize_t device_name_show(struct device *dev,
 287                 struct device_attribute *attr, char *buf)
 288 {
 289         struct omap_dss_device *dssdev = to_dss_device(dev);
 290         return snprintf(buf, PAGE_SIZE, "%s\n",
 291                         dssdev->name ?
 292                         dssdev->name : "");
 293 }
 294
 295 static struct device_attribute default_dev_attrs[] = {
 296         __ATTR(name, S_IRUGO, device_name_show, NULL),
 297         __ATTR_NULL,
 298 };
 299
 300 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 301 {
 302         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 303         return snprintf(buf, PAGE_SIZE, "%s\n",
 304                         dssdrv->driver.name ?
 305                         dssdrv->driver.name : "");
 306 }
 307 static struct driver_attribute default_drv_attrs[] = {
 308         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 309         __ATTR_NULL,
 310 };
 311
 312 static struct bus_type dss_bus_type = {
 313         .name = "omapdss",
 314         .match = dss_bus_match,
 315         .dev_attrs = default_dev_attrs,
 316         .drv_attrs = default_drv_attrs,
 317 };
 318
 319 static void dss_bus_release(struct device *dev)
 320 {
 321         DSSDBG("bus_release\n");
 322 }
 323
 324 static struct device dss_bus = {
 325         .release = dss_bus_release,
 326 };
 327
 328 struct bus_type *dss_get_bus(void)
 329 {
 330         return &dss_bus_type;
 331 }
 332
 333 /* DRIVER */
 334 static int dss_driver_probe(struct device *dev)
 335 {
 336         int r;
 337         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 338         struct omap_dss_device *dssdev = to_dss_device(dev);
 339         bool force;
 340
 341         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 342                                 dev_name(dev), dssdev->driver_name,
 343                                 dssdrv->driver.name);
 344
 345         dss_init_device(core.pdev, dssdev);
 346
 347         force = core.default_display_name &&
 348                 strcmp(core.default_display_name, dssdev->name) == 0;
 349         dss_recheck_connections(dssdev, force);
 350
 351         r = dssdrv->probe(dssdev);
 352
 353         if (r) {
 354                 DSSERR("driver probe failed: %d\n", r);
 355                 dss_uninit_device(core.pdev, dssdev);
 356                 return r;
 357         }
 358
 359         DSSDBG("probe done for device %s\n", dev_name(dev));
 360
 361         dssdev->driver = dssdrv;
 362
 363         return 0;
 364 }
 365
 366 static int dss_driver_remove(struct device *dev)
 367 {
 368         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 369         struct omap_dss_device *dssdev = to_dss_device(dev);
 370
 371         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 372                         dssdev->driver_name);
 373
 374         dssdrv->remove(dssdev);
 375
 376         dss_uninit_device(core.pdev, dssdev);
 377
 378         dssdev->driver = NULL;
 379
 380         return 0;
 381 }
 382
 383 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 384 {
 385         dssdriver->driver.bus = &dss_bus_type;
 386         dssdriver->driver.probe = dss_driver_probe;
 387         dssdriver->driver.remove = dss_driver_remove;
 388
 389         if (dssdriver->get_resolution == NULL)
 390                 dssdriver->get_resolution = omapdss_default_get_resolution;
 391         if (dssdriver->get_recommended_bpp == NULL)
 392                 dssdriver->get_recommended_bpp =
 393                         omapdss_default_get_recommended_bpp;
 394         if (dssdriver->get_timings == NULL)
 395                 dssdriver->get_timings = omapdss_default_get_timings;
 396
 397         return driver_register(&dssdriver->driver);
 398 }
 399 EXPORT_SYMBOL(omap_dss_register_driver);
 400
 401 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 402 {
 403         driver_unregister(&dssdriver->driver);
 404 }
 405 EXPORT_SYMBOL(omap_dss_unregister_driver);
 406
 407 /* DEVICE */
 408 static void reset_device(struct device *dev, int check)
 409 {
 410         u8 *dev_p = (u8 *)dev;
 411         u8 *dev_end = dev_p + sizeof(*dev);
 412         void *saved_pdata;
 413
 414         saved_pdata = dev->platform_data;
 415         if (check) {
 416                 /*
 417                  * Check if there is any other setting than platform_data
 418                  * in struct device; warn that these will be reset by our
 419                  * init.
 420                  */
 421                 dev->platform_data = NULL;
 422                 while (dev_p < dev_end) {
 423                         if (*dev_p) {
 424                                 WARN("%s: struct device fields will be "
 425                                                 "discarded\n",
 426                                      __func__);
 427                                 break;
 428                         }
 429                         dev_p++;
 430                 }
 431         }
 432         memset(dev, 0, sizeof(*dev));
 433         dev->platform_data = saved_pdata;
 434 }
 435
 436
 437 static void omap_dss_dev_release(struct device *dev)
 438 {
 439         reset_device(dev, 0);
 440 }
 441
 442 int omap_dss_register_device(struct omap_dss_device *dssdev,
 443                 struct device *parent, int disp_num)
 444 {
 445         WARN_ON(!dssdev->driver_name);
 446
 447         reset_device(&dssdev->dev, 1);
 448         dssdev->dev.bus = &dss_bus_type;
 449         dssdev->dev.parent = parent;
 450         dssdev->dev.release = omap_dss_dev_release;
 451         dev_set_name(&dssdev->dev, "display%d", disp_num);
 452         return device_register(&dssdev->dev);
 453 }
 454
 455 void omap_dss_unregister_device(struct omap_dss_device *dssdev)
 456 {
 457         device_unregister(&dssdev->dev);
 458 }
 459
 460 static int dss_unregister_dss_dev(struct device *dev, void *data)
 461 {
 462         struct omap_dss_device *dssdev = to_dss_device(dev);
 463         omap_dss_unregister_device(dssdev);
 464         return 0;
 465 }
 466
 467 void omap_dss_unregister_child_devices(struct device *parent)
 468 {
 469         device_for_each_child(parent, NULL, dss_unregister_dss_dev);
 470 }
 471
 472 /* BUS */
 473 static int __init omap_dss_bus_register(void)
 474 {
 475         int r;
 476
 477         r = bus_register(&dss_bus_type);
 478         if (r) {
 479                 DSSERR("bus register failed\n");
 480                 return r;
 481         }
 482
 483         dev_set_name(&dss_bus, "omapdss");
 484         r = device_register(&dss_bus);
 485         if (r) {
 486                 DSSERR("bus driver register failed\n");
 487                 bus_unregister(&dss_bus_type);
 488                 return r;
 489         }
 490
 491         return 0;
 492 }
 493
 494 /* INIT */
 495 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
 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_OMAP2_DSS_DSI
 509         dsi_init_platform_driver,
 510 #endif
 511 #ifdef CONFIG_OMAP4_DSS_HDMI
 512         hdmi_init_platform_driver,
 513 #endif
 514 };
 515
 516 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
 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_OMAP2_DSS_DSI
 530         dsi_uninit_platform_driver,
 531 #endif
 532 #ifdef CONFIG_OMAP4_DSS_HDMI
 533         hdmi_uninit_platform_driver,
 534 #endif
 535 };
 536
 537 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
 538
 539 static int __init omap_dss_register_drivers(void)
 540 {
 541         int r;
 542         int i;
 543
 544         r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
 545         if (r)
 546                 return r;
 547
 548         r = dss_init_platform_driver();
 549         if (r) {
 550                 DSSERR("Failed to initialize DSS platform driver\n");
 551                 goto err_dss;
 552         }
 553
 554         r = dispc_init_platform_driver();
 555         if (r) {
 556                 DSSERR("Failed to initialize dispc platform driver\n");
 557                 goto err_dispc;
 558         }
 559
 560         /*
 561          * It's ok if the output-driver register fails. It happens, for example,
 562          * when there is no output-device (e.g. SDI for OMAP4).
 563          */
 564         for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
 565                 r = dss_output_drv_reg_funcs[i]();
 566                 if (r == 0)
 567                         dss_output_drv_loaded[i] = true;
 568         }
 569
 570         return 0;
 571
 572 err_dispc:
 573         dss_uninit_platform_driver();
 574 err_dss:
 575         platform_driver_unregister(&omap_dss_driver);
 576
 577         return r;
 578 }
 579
 580 static void __exit omap_dss_unregister_drivers(void)
 581 {
 582         int i;
 583
 584         for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
 585                 if (dss_output_drv_loaded[i])
 586                         dss_output_drv_unreg_funcs[i]();
 587         }
 588
 589         dispc_uninit_platform_driver();
 590         dss_uninit_platform_driver();
 591
 592         platform_driver_unregister(&omap_dss_driver);
 593 }
 594
 595 #ifdef CONFIG_OMAP2_DSS_MODULE
 596 static void omap_dss_bus_unregister(void)
 597 {
 598         device_unregister(&dss_bus);
 599
 600         bus_unregister(&dss_bus_type);
 601 }
 602
 603 static int __init omap_dss_init(void)
 604 {
 605         int r;
 606
 607         r = omap_dss_bus_register();
 608         if (r)
 609                 return r;
 610
 611         r = omap_dss_register_drivers();
 612         if (r) {
 613                 omap_dss_bus_unregister();
 614                 return r;
 615         }
 616
 617         return 0;
 618 }
 619
 620 static void __exit omap_dss_exit(void)
 621 {
 622         if (core.vdds_dsi_reg != NULL) {
 623                 regulator_put(core.vdds_dsi_reg);
 624                 core.vdds_dsi_reg = NULL;
 625         }
 626
 627         if (core.vdds_sdi_reg != NULL) {
 628                 regulator_put(core.vdds_sdi_reg);
 629                 core.vdds_sdi_reg = NULL;
 630         }
 631
 632         omap_dss_unregister_drivers();
 633
 634         omap_dss_bus_unregister();
 635 }
 636
 637 module_init(omap_dss_init);
 638 module_exit(omap_dss_exit);
 639 #else
 640 static int __init omap_dss_init(void)
 641 {
 642         return omap_dss_bus_register();
 643 }
 644
 645 static int __init omap_dss_init2(void)
 646 {
 647         return omap_dss_register_drivers();
 648 }
 649
 650 core_initcall(omap_dss_init);
 651 device_initcall(omap_dss_init2);
 652 #endif
 653
 654 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 655 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 656 MODULE_LICENSE("GPL v2");
 657