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 } core;
  47
  48 static char *def_disp_name;
  49 module_param_named(def_disp, def_disp_name, charp, 0);
  50 MODULE_PARM_DESC(def_disp, "default display name");
  51
  52 #ifdef DEBUG
  53 bool dss_debug;
  54 module_param_named(debug, dss_debug, bool, 0644);
  55 #endif
  56
  57 static int omap_dss_register_device(struct omap_dss_device *);
  58 static void omap_dss_unregister_device(struct omap_dss_device *);
  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 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_OMAP2_DSS_DEBUG_SUPPORT)
  91 static int dss_debug_show(struct seq_file *s, void *unused)
  92 {
  93         void (*func)(struct seq_file *) = s->private;
  94         func(s);
  95         return 0;
  96 }
  97
  98 static int dss_debug_open(struct inode *inode, struct file *file)
  99 {
 100         return single_open(file, dss_debug_show, inode->i_private);
 101 }
 102
 103 static const struct file_operations dss_debug_fops = {
 104         .open           = dss_debug_open,
 105         .read           = seq_read,
 106         .llseek         = seq_lseek,
 107         .release        = single_release,
 108 };
 109
 110 static struct dentry *dss_debugfs_dir;
 111
 112 static int dss_initialize_debugfs(void)
 113 {
 114         dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
 115         if (IS_ERR(dss_debugfs_dir)) {
 116                 int err = PTR_ERR(dss_debugfs_dir);
 117                 dss_debugfs_dir = NULL;
 118                 return err;
 119         }
 120
 121         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
 122                         &dss_debug_dump_clocks, &dss_debug_fops);
 123
 124 #ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
 125         debugfs_create_file("dispc_irq", S_IRUGO, dss_debugfs_dir,
 126                         &dispc_dump_irqs, &dss_debug_fops);
 127 #endif
 128
 129 #if defined(CONFIG_OMAP2_DSS_DSI) && defined(CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS)
 130         dsi_create_debugfs_files_irq(dss_debugfs_dir, &dss_debug_fops);
 131 #endif
 132
 133         debugfs_create_file("dss", S_IRUGO, dss_debugfs_dir,
 134                         &dss_dump_regs, &dss_debug_fops);
 135         debugfs_create_file("dispc", S_IRUGO, dss_debugfs_dir,
 136                         &dispc_dump_regs, &dss_debug_fops);
 137 #ifdef CONFIG_OMAP2_DSS_RFBI
 138         debugfs_create_file("rfbi", S_IRUGO, dss_debugfs_dir,
 139                         &rfbi_dump_regs, &dss_debug_fops);
 140 #endif
 141 #ifdef CONFIG_OMAP2_DSS_DSI
 142         dsi_create_debugfs_files_reg(dss_debugfs_dir, &dss_debug_fops);
 143 #endif
 144 #ifdef CONFIG_OMAP2_DSS_VENC
 145         debugfs_create_file("venc", S_IRUGO, dss_debugfs_dir,
 146                         &venc_dump_regs, &dss_debug_fops);
 147 #endif
 148 #ifdef CONFIG_OMAP4_DSS_HDMI
 149         debugfs_create_file("hdmi", S_IRUGO, dss_debugfs_dir,
 150                         &hdmi_dump_regs, &dss_debug_fops);
 151 #endif
 152         return 0;
 153 }
 154
 155 static void dss_uninitialize_debugfs(void)
 156 {
 157         if (dss_debugfs_dir)
 158                 debugfs_remove_recursive(dss_debugfs_dir);
 159 }
 160 #else /* CONFIG_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
 161 static inline int dss_initialize_debugfs(void)
 162 {
 163         return 0;
 164 }
 165 static inline void dss_uninitialize_debugfs(void)
 166 {
 167 }
 168 #endif /* CONFIG_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
 169
 170 /* PLATFORM DEVICE */
 171 static int omap_dss_probe(struct platform_device *pdev)
 172 {
 173         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 174         int r;
 175         int i;
 176
 177         core.pdev = pdev;
 178
 179         dss_features_init();
 180
 181         dss_apply_init();
 182
 183         dss_init_overlay_managers(pdev);
 184         dss_init_overlays(pdev);
 185
 186         r = dss_initialize_debugfs();
 187         if (r)
 188                 goto err_debugfs;
 189
 190         for (i = 0; i < pdata->num_devices; ++i) {
 191                 struct omap_dss_device *dssdev = pdata->devices[i];
 192
 193                 r = omap_dss_register_device(dssdev);
 194                 if (r) {
 195                         DSSERR("device %d %s register failed %d\n", i,
 196                                 dssdev->name ?: "unnamed", r);
 197
 198                         while (--i >= 0)
 199                                 omap_dss_unregister_device(pdata->devices[i]);
 200
 201                         goto err_register;
 202                 }
 203
 204                 if (def_disp_name && strcmp(def_disp_name, dssdev->name) == 0)
 205                         pdata->default_device = dssdev;
 206         }
 207
 208         return 0;
 209
 210 err_register:
 211         dss_uninitialize_debugfs();
 212 err_debugfs:
 213
 214         return r;
 215 }
 216
 217 static int omap_dss_remove(struct platform_device *pdev)
 218 {
 219         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 220         int i;
 221
 222         dss_uninitialize_debugfs();
 223
 224         dss_uninit_overlays(pdev);
 225         dss_uninit_overlay_managers(pdev);
 226
 227         for (i = 0; i < pdata->num_devices; ++i)
 228                 omap_dss_unregister_device(pdata->devices[i]);
 229
 230         return 0;
 231 }
 232
 233 static void omap_dss_shutdown(struct platform_device *pdev)
 234 {
 235         DSSDBG("shutdown\n");
 236         dss_disable_all_devices();
 237 }
 238
 239 static int omap_dss_suspend(struct platform_device *pdev, pm_message_t state)
 240 {
 241         DSSDBG("suspend %d\n", state.event);
 242
 243         return dss_suspend_all_devices();
 244 }
 245
 246 static int omap_dss_resume(struct platform_device *pdev)
 247 {
 248         DSSDBG("resume\n");
 249
 250         return dss_resume_all_devices();
 251 }
 252
 253 static struct platform_driver omap_dss_driver = {
 254         .probe          = omap_dss_probe,
 255         .remove         = omap_dss_remove,
 256         .shutdown       = omap_dss_shutdown,
 257         .suspend        = omap_dss_suspend,
 258         .resume         = omap_dss_resume,
 259         .driver         = {
 260                 .name   = "omapdss",
 261                 .owner  = THIS_MODULE,
 262         },
 263 };
 264
 265 /* BUS */
 266 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 267 {
 268         struct omap_dss_device *dssdev = to_dss_device(dev);
 269
 270         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 271                         dev_name(dev), dssdev->driver_name, driver->name);
 272
 273         return strcmp(dssdev->driver_name, driver->name) == 0;
 274 }
 275
 276 static ssize_t device_name_show(struct device *dev,
 277                 struct device_attribute *attr, char *buf)
 278 {
 279         struct omap_dss_device *dssdev = to_dss_device(dev);
 280         return snprintf(buf, PAGE_SIZE, "%s\n",
 281                         dssdev->name ?
 282                         dssdev->name : "");
 283 }
 284
 285 static struct device_attribute default_dev_attrs[] = {
 286         __ATTR(name, S_IRUGO, device_name_show, NULL),
 287         __ATTR_NULL,
 288 };
 289
 290 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 291 {
 292         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 293         return snprintf(buf, PAGE_SIZE, "%s\n",
 294                         dssdrv->driver.name ?
 295                         dssdrv->driver.name : "");
 296 }
 297 static struct driver_attribute default_drv_attrs[] = {
 298         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 299         __ATTR_NULL,
 300 };
 301
 302 static struct bus_type dss_bus_type = {
 303         .name = "omapdss",
 304         .match = dss_bus_match,
 305         .dev_attrs = default_dev_attrs,
 306         .drv_attrs = default_drv_attrs,
 307 };
 308
 309 static void dss_bus_release(struct device *dev)
 310 {
 311         DSSDBG("bus_release\n");
 312 }
 313
 314 static struct device dss_bus = {
 315         .release = dss_bus_release,
 316 };
 317
 318 struct bus_type *dss_get_bus(void)
 319 {
 320         return &dss_bus_type;
 321 }
 322
 323 /* DRIVER */
 324 static int dss_driver_probe(struct device *dev)
 325 {
 326         int r;
 327         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 328         struct omap_dss_device *dssdev = to_dss_device(dev);
 329         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 330         bool force;
 331
 332         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 333                                 dev_name(dev), dssdev->driver_name,
 334                                 dssdrv->driver.name);
 335
 336         dss_init_device(core.pdev, dssdev);
 337
 338         force = pdata->default_device == dssdev;
 339         dss_recheck_connections(dssdev, force);
 340
 341         r = dssdrv->probe(dssdev);
 342
 343         if (r) {
 344                 DSSERR("driver probe failed: %d\n", r);
 345                 dss_uninit_device(core.pdev, dssdev);
 346                 return r;
 347         }
 348
 349         DSSDBG("probe done for device %s\n", dev_name(dev));
 350
 351         dssdev->driver = dssdrv;
 352
 353         return 0;
 354 }
 355
 356 static int dss_driver_remove(struct device *dev)
 357 {
 358         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 359         struct omap_dss_device *dssdev = to_dss_device(dev);
 360
 361         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 362                         dssdev->driver_name);
 363
 364         dssdrv->remove(dssdev);
 365
 366         dss_uninit_device(core.pdev, dssdev);
 367
 368         dssdev->driver = NULL;
 369
 370         return 0;
 371 }
 372
 373 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 374 {
 375         dssdriver->driver.bus = &dss_bus_type;
 376         dssdriver->driver.probe = dss_driver_probe;
 377         dssdriver->driver.remove = dss_driver_remove;
 378
 379         if (dssdriver->get_resolution == NULL)
 380                 dssdriver->get_resolution = omapdss_default_get_resolution;
 381         if (dssdriver->get_recommended_bpp == NULL)
 382                 dssdriver->get_recommended_bpp =
 383                         omapdss_default_get_recommended_bpp;
 384
 385         return driver_register(&dssdriver->driver);
 386 }
 387 EXPORT_SYMBOL(omap_dss_register_driver);
 388
 389 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 390 {
 391         driver_unregister(&dssdriver->driver);
 392 }
 393 EXPORT_SYMBOL(omap_dss_unregister_driver);
 394
 395 /* DEVICE */
 396 static void reset_device(struct device *dev, int check)
 397 {
 398         u8 *dev_p = (u8 *)dev;
 399         u8 *dev_end = dev_p + sizeof(*dev);
 400         void *saved_pdata;
 401
 402         saved_pdata = dev->platform_data;
 403         if (check) {
 404                 /*
 405                  * Check if there is any other setting than platform_data
 406                  * in struct device; warn that these will be reset by our
 407                  * init.
 408                  */
 409                 dev->platform_data = NULL;
 410                 while (dev_p < dev_end) {
 411                         if (*dev_p) {
 412                                 WARN("%s: struct device fields will be "
 413                                                 "discarded\n",
 414                                      __func__);
 415                                 break;
 416                         }
 417                         dev_p++;
 418                 }
 419         }
 420         memset(dev, 0, sizeof(*dev));
 421         dev->platform_data = saved_pdata;
 422 }
 423
 424
 425 static void omap_dss_dev_release(struct device *dev)
 426 {
 427         reset_device(dev, 0);
 428 }
 429
 430 static int omap_dss_register_device(struct omap_dss_device *dssdev)
 431 {
 432         static int dev_num;
 433
 434         WARN_ON(!dssdev->driver_name);
 435
 436         reset_device(&dssdev->dev, 1);
 437         dssdev->dev.bus = &dss_bus_type;
 438         dssdev->dev.parent = &dss_bus;
 439         dssdev->dev.release = omap_dss_dev_release;
 440         dev_set_name(&dssdev->dev, "display%d", dev_num++);
 441         return device_register(&dssdev->dev);
 442 }
 443
 444 static void omap_dss_unregister_device(struct omap_dss_device *dssdev)
 445 {
 446         device_unregister(&dssdev->dev);
 447 }
 448
 449 /* BUS */
 450 static int omap_dss_bus_register(void)
 451 {
 452         int r;
 453
 454         r = bus_register(&dss_bus_type);
 455         if (r) {
 456                 DSSERR("bus register failed\n");
 457                 return r;
 458         }
 459
 460         dev_set_name(&dss_bus, "omapdss");
 461         r = device_register(&dss_bus);
 462         if (r) {
 463                 DSSERR("bus driver register failed\n");
 464                 bus_unregister(&dss_bus_type);
 465                 return r;
 466         }
 467
 468         return 0;
 469 }
 470
 471 /* INIT */
 472
 473 static int __init omap_dss_register_drivers(void)
 474 {
 475         int r;
 476
 477         r = platform_driver_register(&omap_dss_driver);
 478         if (r)
 479                 return r;
 480
 481         r = dss_init_platform_driver();
 482         if (r) {
 483                 DSSERR("Failed to initialize DSS platform driver\n");
 484                 goto err_dss;
 485         }
 486
 487         r = dispc_init_platform_driver();
 488         if (r) {
 489                 DSSERR("Failed to initialize dispc platform driver\n");
 490                 goto err_dispc;
 491         }
 492
 493         r = rfbi_init_platform_driver();
 494         if (r) {
 495                 DSSERR("Failed to initialize rfbi platform driver\n");
 496                 goto err_rfbi;
 497         }
 498
 499         r = venc_init_platform_driver();
 500         if (r) {
 501                 DSSERR("Failed to initialize venc platform driver\n");
 502                 goto err_venc;
 503         }
 504
 505         r = dsi_init_platform_driver();
 506         if (r) {
 507                 DSSERR("Failed to initialize DSI platform driver\n");
 508                 goto err_dsi;
 509         }
 510
 511         r = hdmi_init_platform_driver();
 512         if (r) {
 513                 DSSERR("Failed to initialize hdmi\n");
 514                 goto err_hdmi;
 515         }
 516
 517         return 0;
 518
 519 err_hdmi:
 520         dsi_uninit_platform_driver();
 521 err_dsi:
 522         venc_uninit_platform_driver();
 523 err_venc:
 524         rfbi_uninit_platform_driver();
 525 err_rfbi:
 526         dispc_uninit_platform_driver();
 527 err_dispc:
 528         dss_uninit_platform_driver();
 529 err_dss:
 530         platform_driver_unregister(&omap_dss_driver);
 531
 532         return r;
 533 }
 534
 535 static void __exit omap_dss_unregister_drivers(void)
 536 {
 537         hdmi_uninit_platform_driver();
 538         dsi_uninit_platform_driver();
 539         venc_uninit_platform_driver();
 540         rfbi_uninit_platform_driver();
 541         dispc_uninit_platform_driver();
 542         dss_uninit_platform_driver();
 543
 544         platform_driver_unregister(&omap_dss_driver);
 545 }
 546
 547 #ifdef CONFIG_OMAP2_DSS_MODULE
 548 static void omap_dss_bus_unregister(void)
 549 {
 550         device_unregister(&dss_bus);
 551
 552         bus_unregister(&dss_bus_type);
 553 }
 554
 555 static int __init omap_dss_init(void)
 556 {
 557         int r;
 558
 559         r = omap_dss_bus_register();
 560         if (r)
 561                 return r;
 562
 563         r = omap_dss_register_drivers();
 564         if (r) {
 565                 omap_dss_bus_unregister();
 566                 return r;
 567         }
 568
 569         return 0;
 570 }
 571
 572 static void __exit omap_dss_exit(void)
 573 {
 574         if (core.vdds_dsi_reg != NULL) {
 575                 regulator_put(core.vdds_dsi_reg);
 576                 core.vdds_dsi_reg = NULL;
 577         }
 578
 579         if (core.vdds_sdi_reg != NULL) {
 580                 regulator_put(core.vdds_sdi_reg);
 581                 core.vdds_sdi_reg = NULL;
 582         }
 583
 584         omap_dss_unregister_drivers();
 585
 586         omap_dss_bus_unregister();
 587 }
 588
 589 module_init(omap_dss_init);
 590 module_exit(omap_dss_exit);
 591 #else
 592 static int __init omap_dss_init(void)
 593 {
 594         return omap_dss_bus_register();
 595 }
 596
 597 static int __init omap_dss_init2(void)
 598 {
 599         return omap_dss_register_drivers();
 600 }
 601
 602 core_initcall(omap_dss_init);
 603 device_initcall(omap_dss_init2);
 604 #endif
 605
 606 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 607 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 608 MODULE_LICENSE("GPL v2");
 609