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         .remove         = omap_dss_remove,
 266         .shutdown       = omap_dss_shutdown,
 267         .driver         = {
 268                 .name   = "omapdss",
 269                 .owner  = THIS_MODULE,
 270         },
 271 };
 272
 273 /* BUS */
 274 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 275 {
 276         struct omap_dss_device *dssdev = to_dss_device(dev);
 277
 278         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 279                         dev_name(dev), dssdev->driver_name, driver->name);
 280
 281         return strcmp(dssdev->driver_name, driver->name) == 0;
 282 }
 283
 284 static ssize_t device_name_show(struct device *dev,
 285                 struct device_attribute *attr, char *buf)
 286 {
 287         struct omap_dss_device *dssdev = to_dss_device(dev);
 288         return snprintf(buf, PAGE_SIZE, "%s\n",
 289                         dssdev->name ?
 290                         dssdev->name : "");
 291 }
 292
 293 static struct device_attribute default_dev_attrs[] = {
 294         __ATTR(name, S_IRUGO, device_name_show, NULL),
 295         __ATTR_NULL,
 296 };
 297
 298 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 299 {
 300         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 301         return snprintf(buf, PAGE_SIZE, "%s\n",
 302                         dssdrv->driver.name ?
 303                         dssdrv->driver.name : "");
 304 }
 305 static struct driver_attribute default_drv_attrs[] = {
 306         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 307         __ATTR_NULL,
 308 };
 309
 310 static struct bus_type dss_bus_type = {
 311         .name = "omapdss",
 312         .match = dss_bus_match,
 313         .dev_attrs = default_dev_attrs,
 314         .drv_attrs = default_drv_attrs,
 315 };
 316
 317 static void dss_bus_release(struct device *dev)
 318 {
 319         DSSDBG("bus_release\n");
 320 }
 321
 322 static struct device dss_bus = {
 323         .release = dss_bus_release,
 324 };
 325
 326 struct bus_type *dss_get_bus(void)
 327 {
 328         return &dss_bus_type;
 329 }
 330
 331 /* DRIVER */
 332 static int dss_driver_probe(struct device *dev)
 333 {
 334         int r;
 335         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 336         struct omap_dss_device *dssdev = to_dss_device(dev);
 337         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 338         bool force;
 339
 340         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 341                                 dev_name(dev), dssdev->driver_name,
 342                                 dssdrv->driver.name);
 343
 344         dss_init_device(core.pdev, dssdev);
 345
 346         force = pdata->default_device == dssdev;
 347         dss_recheck_connections(dssdev, force);
 348
 349         r = dssdrv->probe(dssdev);
 350
 351         if (r) {
 352                 DSSERR("driver probe failed: %d\n", r);
 353                 dss_uninit_device(core.pdev, dssdev);
 354                 return r;
 355         }
 356
 357         DSSDBG("probe done for device %s\n", dev_name(dev));
 358
 359         dssdev->driver = dssdrv;
 360
 361         return 0;
 362 }
 363
 364 static int dss_driver_remove(struct device *dev)
 365 {
 366         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 367         struct omap_dss_device *dssdev = to_dss_device(dev);
 368
 369         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 370                         dssdev->driver_name);
 371
 372         dssdrv->remove(dssdev);
 373
 374         dss_uninit_device(core.pdev, dssdev);
 375
 376         dssdev->driver = NULL;
 377
 378         return 0;
 379 }
 380
 381 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 382 {
 383         dssdriver->driver.bus = &dss_bus_type;
 384         dssdriver->driver.probe = dss_driver_probe;
 385         dssdriver->driver.remove = dss_driver_remove;
 386
 387         if (dssdriver->get_resolution == NULL)
 388                 dssdriver->get_resolution = omapdss_default_get_resolution;
 389         if (dssdriver->get_recommended_bpp == NULL)
 390                 dssdriver->get_recommended_bpp =
 391                         omapdss_default_get_recommended_bpp;
 392         if (dssdriver->get_timings == NULL)
 393                 dssdriver->get_timings = omapdss_default_get_timings;
 394
 395         return driver_register(&dssdriver->driver);
 396 }
 397 EXPORT_SYMBOL(omap_dss_register_driver);
 398
 399 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 400 {
 401         driver_unregister(&dssdriver->driver);
 402 }
 403 EXPORT_SYMBOL(omap_dss_unregister_driver);
 404
 405 /* DEVICE */
 406 static void reset_device(struct device *dev, int check)
 407 {
 408         u8 *dev_p = (u8 *)dev;
 409         u8 *dev_end = dev_p + sizeof(*dev);
 410         void *saved_pdata;
 411
 412         saved_pdata = dev->platform_data;
 413         if (check) {
 414                 /*
 415                  * Check if there is any other setting than platform_data
 416                  * in struct device; warn that these will be reset by our
 417                  * init.
 418                  */
 419                 dev->platform_data = NULL;
 420                 while (dev_p < dev_end) {
 421                         if (*dev_p) {
 422                                 WARN("%s: struct device fields will be "
 423                                                 "discarded\n",
 424                                      __func__);
 425                                 break;
 426                         }
 427                         dev_p++;
 428                 }
 429         }
 430         memset(dev, 0, sizeof(*dev));
 431         dev->platform_data = saved_pdata;
 432 }
 433
 434
 435 static void omap_dss_dev_release(struct device *dev)
 436 {
 437         reset_device(dev, 0);
 438 }
 439
 440 static int omap_dss_register_device(struct omap_dss_device *dssdev)
 441 {
 442         static int dev_num;
 443
 444         WARN_ON(!dssdev->driver_name);
 445
 446         reset_device(&dssdev->dev, 1);
 447         dssdev->dev.bus = &dss_bus_type;
 448         dssdev->dev.parent = &dss_bus;
 449         dssdev->dev.release = omap_dss_dev_release;
 450         dev_set_name(&dssdev->dev, "display%d", dev_num++);
 451         return device_register(&dssdev->dev);
 452 }
 453
 454 static void omap_dss_unregister_device(struct omap_dss_device *dssdev)
 455 {
 456         device_unregister(&dssdev->dev);
 457 }
 458
 459 /* BUS */
 460 static int omap_dss_bus_register(void)
 461 {
 462         int r;
 463
 464         r = bus_register(&dss_bus_type);
 465         if (r) {
 466                 DSSERR("bus register failed\n");
 467                 return r;
 468         }
 469
 470         dev_set_name(&dss_bus, "omapdss");
 471         r = device_register(&dss_bus);
 472         if (r) {
 473                 DSSERR("bus driver register failed\n");
 474                 bus_unregister(&dss_bus_type);
 475                 return r;
 476         }
 477
 478         return 0;
 479 }
 480
 481 /* INIT */
 482
 483 static int __init omap_dss_register_drivers(void)
 484 {
 485         int r;
 486
 487         r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
 488         if (r)
 489                 return r;
 490
 491         r = dss_init_platform_driver();
 492         if (r) {
 493                 DSSERR("Failed to initialize DSS platform driver\n");
 494                 goto err_dss;
 495         }
 496
 497         r = dispc_init_platform_driver();
 498         if (r) {
 499                 DSSERR("Failed to initialize dispc platform driver\n");
 500                 goto err_dispc;
 501         }
 502
 503         r = rfbi_init_platform_driver();
 504         if (r) {
 505                 DSSERR("Failed to initialize rfbi platform driver\n");
 506                 goto err_rfbi;
 507         }
 508
 509         r = venc_init_platform_driver();
 510         if (r) {
 511                 DSSERR("Failed to initialize venc platform driver\n");
 512                 goto err_venc;
 513         }
 514
 515         r = dsi_init_platform_driver();
 516         if (r) {
 517                 DSSERR("Failed to initialize DSI platform driver\n");
 518                 goto err_dsi;
 519         }
 520
 521         r = hdmi_init_platform_driver();
 522         if (r) {
 523                 DSSERR("Failed to initialize hdmi\n");
 524                 goto err_hdmi;
 525         }
 526
 527         return 0;
 528
 529 err_hdmi:
 530         dsi_uninit_platform_driver();
 531 err_dsi:
 532         venc_uninit_platform_driver();
 533 err_venc:
 534         rfbi_uninit_platform_driver();
 535 err_rfbi:
 536         dispc_uninit_platform_driver();
 537 err_dispc:
 538         dss_uninit_platform_driver();
 539 err_dss:
 540         platform_driver_unregister(&omap_dss_driver);
 541
 542         return r;
 543 }
 544
 545 static void __exit omap_dss_unregister_drivers(void)
 546 {
 547         hdmi_uninit_platform_driver();
 548         dsi_uninit_platform_driver();
 549         venc_uninit_platform_driver();
 550         rfbi_uninit_platform_driver();
 551         dispc_uninit_platform_driver();
 552         dss_uninit_platform_driver();
 553
 554         platform_driver_unregister(&omap_dss_driver);
 555 }
 556
 557 #ifdef CONFIG_OMAP2_DSS_MODULE
 558 static void omap_dss_bus_unregister(void)
 559 {
 560         device_unregister(&dss_bus);
 561
 562         bus_unregister(&dss_bus_type);
 563 }
 564
 565 static int __init omap_dss_init(void)
 566 {
 567         int r;
 568
 569         r = omap_dss_bus_register();
 570         if (r)
 571                 return r;
 572
 573         r = omap_dss_register_drivers();
 574         if (r) {
 575                 omap_dss_bus_unregister();
 576                 return r;
 577         }
 578
 579         return 0;
 580 }
 581
 582 static void __exit omap_dss_exit(void)
 583 {
 584         if (core.vdds_dsi_reg != NULL) {
 585                 regulator_put(core.vdds_dsi_reg);
 586                 core.vdds_dsi_reg = NULL;
 587         }
 588
 589         if (core.vdds_sdi_reg != NULL) {
 590                 regulator_put(core.vdds_sdi_reg);
 591                 core.vdds_sdi_reg = NULL;
 592         }
 593
 594         omap_dss_unregister_drivers();
 595
 596         omap_dss_bus_unregister();
 597 }
 598
 599 module_init(omap_dss_init);
 600 module_exit(omap_dss_exit);
 601 #else
 602 static int __init omap_dss_init(void)
 603 {
 604         return omap_dss_bus_register();
 605 }
 606
 607 static int __init omap_dss_init2(void)
 608 {
 609         return omap_dss_register_drivers();
 610 }
 611
 612 core_initcall(omap_dss_init);
 613 device_initcall(omap_dss_init2);
 614 #endif
 615
 616 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 617 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 618 MODULE_LICENSE("GPL v2");
 619