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 } core;
  48
  49 static char *def_disp_name;
  50 module_param_named(def_disp, def_disp_name, charp, 0);
  51 MODULE_PARM_DESC(def_disp, "default display name");
  52
  53 #ifdef DEBUG
  54 unsigned int dss_debug;
  55 module_param_named(debug, dss_debug, bool, 0644);
  56 #endif
  57
  58 static int omap_dss_register_device(struct omap_dss_device *);
  59 static void omap_dss_unregister_device(struct omap_dss_device *);
  60
  61 /* REGULATORS */
  62
  63 struct regulator *dss_get_vdds_dsi(void)
  64 {
  65         struct regulator *reg;
  66
  67         if (core.vdds_dsi_reg != NULL)
  68                 return core.vdds_dsi_reg;
  69
  70         reg = regulator_get(&core.pdev->dev, "vdds_dsi");
  71         if (!IS_ERR(reg))
  72                 core.vdds_dsi_reg = reg;
  73
  74         return reg;
  75 }
  76
  77 struct regulator *dss_get_vdds_sdi(void)
  78 {
  79         struct regulator *reg;
  80
  81         if (core.vdds_sdi_reg != NULL)
  82                 return core.vdds_sdi_reg;
  83
  84         reg = regulator_get(&core.pdev->dev, "vdds_sdi");
  85         if (!IS_ERR(reg))
  86                 core.vdds_sdi_reg = reg;
  87
  88         return reg;
  89 }
  90
  91 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_OMAP2_DSS_DEBUG_SUPPORT)
  92 static int dss_debug_show(struct seq_file *s, void *unused)
  93 {
  94         void (*func)(struct seq_file *) = s->private;
  95         func(s);
  96         return 0;
  97 }
  98
  99 static int dss_debug_open(struct inode *inode, struct file *file)
 100 {
 101         return single_open(file, dss_debug_show, inode->i_private);
 102 }
 103
 104 static const struct file_operations dss_debug_fops = {
 105         .open           = dss_debug_open,
 106         .read           = seq_read,
 107         .llseek         = seq_lseek,
 108         .release        = single_release,
 109 };
 110
 111 static struct dentry *dss_debugfs_dir;
 112
 113 static int dss_initialize_debugfs(void)
 114 {
 115         dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
 116         if (IS_ERR(dss_debugfs_dir)) {
 117                 int err = PTR_ERR(dss_debugfs_dir);
 118                 dss_debugfs_dir = NULL;
 119                 return err;
 120         }
 121
 122         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
 123                         &dss_debug_dump_clocks, &dss_debug_fops);
 124
 125 #ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
 126         debugfs_create_file("dispc_irq", S_IRUGO, dss_debugfs_dir,
 127                         &dispc_dump_irqs, &dss_debug_fops);
 128 #endif
 129
 130 #if defined(CONFIG_OMAP2_DSS_DSI) && defined(CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS)
 131         dsi_create_debugfs_files_irq(dss_debugfs_dir, &dss_debug_fops);
 132 #endif
 133
 134         debugfs_create_file("dss", S_IRUGO, dss_debugfs_dir,
 135                         &dss_dump_regs, &dss_debug_fops);
 136         debugfs_create_file("dispc", S_IRUGO, dss_debugfs_dir,
 137                         &dispc_dump_regs, &dss_debug_fops);
 138 #ifdef CONFIG_OMAP2_DSS_RFBI
 139         debugfs_create_file("rfbi", S_IRUGO, dss_debugfs_dir,
 140                         &rfbi_dump_regs, &dss_debug_fops);
 141 #endif
 142 #ifdef CONFIG_OMAP2_DSS_DSI
 143         dsi_create_debugfs_files_reg(dss_debugfs_dir, &dss_debug_fops);
 144 #endif
 145 #ifdef CONFIG_OMAP2_DSS_VENC
 146         debugfs_create_file("venc", S_IRUGO, dss_debugfs_dir,
 147                         &venc_dump_regs, &dss_debug_fops);
 148 #endif
 149 #ifdef CONFIG_OMAP4_DSS_HDMI
 150         debugfs_create_file("hdmi", S_IRUGO, dss_debugfs_dir,
 151                         &hdmi_dump_regs, &dss_debug_fops);
 152 #endif
 153         return 0;
 154 }
 155
 156 static void dss_uninitialize_debugfs(void)
 157 {
 158         if (dss_debugfs_dir)
 159                 debugfs_remove_recursive(dss_debugfs_dir);
 160 }
 161 #else /* CONFIG_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
 162 static inline int dss_initialize_debugfs(void)
 163 {
 164         return 0;
 165 }
 166 static inline void dss_uninitialize_debugfs(void)
 167 {
 168 }
 169 #endif /* CONFIG_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
 170
 171 /* PLATFORM DEVICE */
 172 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
 173 {
 174         DSSDBG("pm notif %lu\n", v);
 175
 176         switch (v) {
 177         case PM_SUSPEND_PREPARE:
 178                 DSSDBG("suspending displays\n");
 179                 return dss_suspend_all_devices();
 180
 181         case PM_POST_SUSPEND:
 182                 DSSDBG("resuming displays\n");
 183                 return dss_resume_all_devices();
 184
 185         default:
 186                 return 0;
 187         }
 188 }
 189
 190 static struct notifier_block omap_dss_pm_notif_block = {
 191         .notifier_call = omap_dss_pm_notif,
 192 };
 193
 194 static int __init omap_dss_probe(struct platform_device *pdev)
 195 {
 196         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 197         int r;
 198         int i;
 199
 200         core.pdev = pdev;
 201
 202         dss_features_init();
 203
 204         dss_init_overlay_managers(pdev);
 205         dss_init_overlays(pdev);
 206
 207         r = dss_initialize_debugfs();
 208         if (r)
 209                 goto err_debugfs;
 210
 211         for (i = 0; i < pdata->num_devices; ++i) {
 212                 struct omap_dss_device *dssdev = pdata->devices[i];
 213
 214                 r = omap_dss_register_device(dssdev);
 215                 if (r) {
 216                         DSSERR("device %d %s register failed %d\n", i,
 217                                 dssdev->name ?: "unnamed", r);
 218
 219                         while (--i >= 0)
 220                                 omap_dss_unregister_device(pdata->devices[i]);
 221
 222                         goto err_register;
 223                 }
 224
 225                 if (def_disp_name && strcmp(def_disp_name, dssdev->name) == 0)
 226                         pdata->default_device = dssdev;
 227         }
 228
 229         register_pm_notifier(&omap_dss_pm_notif_block);
 230
 231         return 0;
 232
 233 err_register:
 234         dss_uninitialize_debugfs();
 235 err_debugfs:
 236
 237         return r;
 238 }
 239
 240 static int omap_dss_remove(struct platform_device *pdev)
 241 {
 242         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 243         int i;
 244
 245         unregister_pm_notifier(&omap_dss_pm_notif_block);
 246
 247         dss_uninitialize_debugfs();
 248
 249         dss_uninit_overlays(pdev);
 250         dss_uninit_overlay_managers(pdev);
 251
 252         for (i = 0; i < pdata->num_devices; ++i)
 253                 omap_dss_unregister_device(pdata->devices[i]);
 254
 255         return 0;
 256 }
 257
 258 static void omap_dss_shutdown(struct platform_device *pdev)
 259 {
 260         DSSDBG("shutdown\n");
 261         dss_disable_all_devices();
 262 }
 263
 264 static struct platform_driver omap_dss_driver = {
 265         .probe          = omap_dss_probe,
 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         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 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 = pdata->default_device == dssdev;
 348         dss_recheck_connections(dssdev, force);
 349
 350         r = dssdrv->probe(dssdev);
 351
 352         if (r) {
 353                 DSSERR("driver probe failed: %d\n", r);
 354                 dss_uninit_device(core.pdev, dssdev);
 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         dss_uninit_device(core.pdev, dssdev);
 376
 377         dssdev->driver = NULL;
 378
 379         return 0;
 380 }
 381
 382 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 383 {
 384         dssdriver->driver.bus = &dss_bus_type;
 385         dssdriver->driver.probe = dss_driver_probe;
 386         dssdriver->driver.remove = dss_driver_remove;
 387
 388         if (dssdriver->get_resolution == NULL)
 389                 dssdriver->get_resolution = omapdss_default_get_resolution;
 390         if (dssdriver->get_recommended_bpp == NULL)
 391                 dssdriver->get_recommended_bpp =
 392                         omapdss_default_get_recommended_bpp;
 393         if (dssdriver->get_timings == NULL)
 394                 dssdriver->get_timings = omapdss_default_get_timings;
 395
 396         return driver_register(&dssdriver->driver);
 397 }
 398 EXPORT_SYMBOL(omap_dss_register_driver);
 399
 400 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 401 {
 402         driver_unregister(&dssdriver->driver);
 403 }
 404 EXPORT_SYMBOL(omap_dss_unregister_driver);
 405
 406 /* DEVICE */
 407 static void reset_device(struct device *dev, int check)
 408 {
 409         u8 *dev_p = (u8 *)dev;
 410         u8 *dev_end = dev_p + sizeof(*dev);
 411         void *saved_pdata;
 412
 413         saved_pdata = dev->platform_data;
 414         if (check) {
 415                 /*
 416                  * Check if there is any other setting than platform_data
 417                  * in struct device; warn that these will be reset by our
 418                  * init.
 419                  */
 420                 dev->platform_data = NULL;
 421                 while (dev_p < dev_end) {
 422                         if (*dev_p) {
 423                                 WARN("%s: struct device fields will be "
 424                                                 "discarded\n",
 425                                      __func__);
 426                                 break;
 427                         }
 428                         dev_p++;
 429                 }
 430         }
 431         memset(dev, 0, sizeof(*dev));
 432         dev->platform_data = saved_pdata;
 433 }
 434
 435
 436 static void omap_dss_dev_release(struct device *dev)
 437 {
 438         reset_device(dev, 0);
 439 }
 440
 441 static int omap_dss_register_device(struct omap_dss_device *dssdev)
 442 {
 443         static int dev_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 = &dss_bus;
 450         dssdev->dev.release = omap_dss_dev_release;
 451         dev_set_name(&dssdev->dev, "display%d", dev_num++);
 452         return device_register(&dssdev->dev);
 453 }
 454
 455 static void omap_dss_unregister_device(struct omap_dss_device *dssdev)
 456 {
 457         device_unregister(&dssdev->dev);
 458 }
 459
 460 /* BUS */
 461 static int omap_dss_bus_register(void)
 462 {
 463         int r;
 464
 465         r = bus_register(&dss_bus_type);
 466         if (r) {
 467                 DSSERR("bus register failed\n");
 468                 return r;
 469         }
 470
 471         dev_set_name(&dss_bus, "omapdss");
 472         r = device_register(&dss_bus);
 473         if (r) {
 474                 DSSERR("bus driver register failed\n");
 475                 bus_unregister(&dss_bus_type);
 476                 return r;
 477         }
 478
 479         return 0;
 480 }
 481
 482 /* INIT */
 483
 484 static int __init omap_dss_register_drivers(void)
 485 {
 486         int r;
 487
 488         r = platform_driver_register(&omap_dss_driver);
 489         if (r)
 490                 return r;
 491
 492         r = dss_init_platform_driver();
 493         if (r) {
 494                 DSSERR("Failed to initialize DSS platform driver\n");
 495                 goto err_dss;
 496         }
 497
 498         r = dispc_init_platform_driver();
 499         if (r) {
 500                 DSSERR("Failed to initialize dispc platform driver\n");
 501                 goto err_dispc;
 502         }
 503
 504         r = rfbi_init_platform_driver();
 505         if (r) {
 506                 DSSERR("Failed to initialize rfbi platform driver\n");
 507                 goto err_rfbi;
 508         }
 509
 510         r = venc_init_platform_driver();
 511         if (r) {
 512                 DSSERR("Failed to initialize venc platform driver\n");
 513                 goto err_venc;
 514         }
 515
 516         r = dsi_init_platform_driver();
 517         if (r) {
 518                 DSSERR("Failed to initialize DSI platform driver\n");
 519                 goto err_dsi;
 520         }
 521
 522         r = hdmi_init_platform_driver();
 523         if (r) {
 524                 DSSERR("Failed to initialize hdmi\n");
 525                 goto err_hdmi;
 526         }
 527
 528         return 0;
 529
 530 err_hdmi:
 531         dsi_uninit_platform_driver();
 532 err_dsi:
 533         venc_uninit_platform_driver();
 534 err_venc:
 535         rfbi_uninit_platform_driver();
 536 err_rfbi:
 537         dispc_uninit_platform_driver();
 538 err_dispc:
 539         dss_uninit_platform_driver();
 540 err_dss:
 541         platform_driver_unregister(&omap_dss_driver);
 542
 543         return r;
 544 }
 545
 546 static void __exit omap_dss_unregister_drivers(void)
 547 {
 548         hdmi_uninit_platform_driver();
 549         dsi_uninit_platform_driver();
 550         venc_uninit_platform_driver();
 551         rfbi_uninit_platform_driver();
 552         dispc_uninit_platform_driver();
 553         dss_uninit_platform_driver();
 554
 555         platform_driver_unregister(&omap_dss_driver);
 556 }
 557
 558 #ifdef CONFIG_OMAP2_DSS_MODULE
 559 static void omap_dss_bus_unregister(void)
 560 {
 561         device_unregister(&dss_bus);
 562
 563         bus_unregister(&dss_bus_type);
 564 }
 565
 566 static int __init omap_dss_init(void)
 567 {
 568         int r;
 569
 570         r = omap_dss_bus_register();
 571         if (r)
 572                 return r;
 573
 574         r = omap_dss_register_drivers();
 575         if (r) {
 576                 omap_dss_bus_unregister();
 577                 return r;
 578         }
 579
 580         return 0;
 581 }
 582
 583 static void __exit omap_dss_exit(void)
 584 {
 585         if (core.vdds_dsi_reg != NULL) {
 586                 regulator_put(core.vdds_dsi_reg);
 587                 core.vdds_dsi_reg = NULL;
 588         }
 589
 590         if (core.vdds_sdi_reg != NULL) {
 591                 regulator_put(core.vdds_sdi_reg);
 592                 core.vdds_sdi_reg = NULL;
 593         }
 594
 595         omap_dss_unregister_drivers();
 596
 597         omap_dss_bus_unregister();
 598 }
 599
 600 module_init(omap_dss_init);
 601 module_exit(omap_dss_exit);
 602 #else
 603 static int __init omap_dss_init(void)
 604 {
 605         return omap_dss_bus_register();
 606 }
 607
 608 static int __init omap_dss_init2(void)
 609 {
 610         return omap_dss_register_drivers();
 611 }
 612
 613 core_initcall(omap_dss_init);
 614 device_initcall(omap_dss_init2);
 615 #endif
 616
 617 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 618 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 619 MODULE_LICENSE("GPL v2");
 620