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 <plat/display.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 unsigned int dss_debug;
  54 module_param_named(debug, dss_debug, bool, 0644);
  55 #endif
  56
  57 /* REGULATORS */
  58
  59 struct regulator *dss_get_vdds_dsi(void)
  60 {
  61         struct regulator *reg;
  62
  63         if (core.vdds_dsi_reg != NULL)
  64                 return core.vdds_dsi_reg;
  65
  66         reg = regulator_get(&core.pdev->dev, "vdds_dsi");
  67         if (!IS_ERR(reg))
  68                 core.vdds_dsi_reg = reg;
  69
  70         return reg;
  71 }
  72
  73 struct regulator *dss_get_vdds_sdi(void)
  74 {
  75         struct regulator *reg;
  76
  77         if (core.vdds_sdi_reg != NULL)
  78                 return core.vdds_sdi_reg;
  79
  80         reg = regulator_get(&core.pdev->dev, "vdds_sdi");
  81         if (!IS_ERR(reg))
  82                 core.vdds_sdi_reg = reg;
  83
  84         return reg;
  85 }
  86
  87 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_OMAP2_DSS_DEBUG_SUPPORT)
  88 static int dss_debug_show(struct seq_file *s, void *unused)
  89 {
  90         void (*func)(struct seq_file *) = s->private;
  91         func(s);
  92         return 0;
  93 }
  94
  95 static int dss_debug_open(struct inode *inode, struct file *file)
  96 {
  97         return single_open(file, dss_debug_show, inode->i_private);
  98 }
  99
 100 static const struct file_operations dss_debug_fops = {
 101         .open           = dss_debug_open,
 102         .read           = seq_read,
 103         .llseek         = seq_lseek,
 104         .release        = single_release,
 105 };
 106
 107 static struct dentry *dss_debugfs_dir;
 108
 109 static int dss_initialize_debugfs(void)
 110 {
 111         dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
 112         if (IS_ERR(dss_debugfs_dir)) {
 113                 int err = PTR_ERR(dss_debugfs_dir);
 114                 dss_debugfs_dir = NULL;
 115                 return err;
 116         }
 117
 118         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
 119                         &dss_debug_dump_clocks, &dss_debug_fops);
 120
 121 #ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
 122         debugfs_create_file("dispc_irq", S_IRUGO, dss_debugfs_dir,
 123                         &dispc_dump_irqs, &dss_debug_fops);
 124 #endif
 125
 126 #if defined(CONFIG_OMAP2_DSS_DSI) && defined(CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS)
 127         debugfs_create_file("dsi_irq", S_IRUGO, dss_debugfs_dir,
 128                         &dsi_dump_irqs, &dss_debug_fops);
 129 #endif
 130
 131         debugfs_create_file("dss", S_IRUGO, dss_debugfs_dir,
 132                         &dss_dump_regs, &dss_debug_fops);
 133         debugfs_create_file("dispc", S_IRUGO, dss_debugfs_dir,
 134                         &dispc_dump_regs, &dss_debug_fops);
 135 #ifdef CONFIG_OMAP2_DSS_RFBI
 136         debugfs_create_file("rfbi", S_IRUGO, dss_debugfs_dir,
 137                         &rfbi_dump_regs, &dss_debug_fops);
 138 #endif
 139 #ifdef CONFIG_OMAP2_DSS_DSI
 140         debugfs_create_file("dsi", S_IRUGO, dss_debugfs_dir,
 141                         &dsi_dump_regs, &dss_debug_fops);
 142 #endif
 143 #ifdef CONFIG_OMAP2_DSS_VENC
 144         debugfs_create_file("venc", S_IRUGO, dss_debugfs_dir,
 145                         &venc_dump_regs, &dss_debug_fops);
 146 #endif
 147         return 0;
 148 }
 149
 150 static void dss_uninitialize_debugfs(void)
 151 {
 152         if (dss_debugfs_dir)
 153                 debugfs_remove_recursive(dss_debugfs_dir);
 154 }
 155 #else /* CONFIG_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
 156 static inline int dss_initialize_debugfs(void)
 157 {
 158         return 0;
 159 }
 160 static inline void dss_uninitialize_debugfs(void)
 161 {
 162 }
 163 #endif /* CONFIG_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
 164
 165 /* PLATFORM DEVICE */
 166 static int omap_dss_probe(struct platform_device *pdev)
 167 {
 168         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 169         int r;
 170         int i;
 171
 172         core.pdev = pdev;
 173
 174         dss_features_init();
 175
 176         dss_init_overlay_managers(pdev);
 177         dss_init_overlays(pdev);
 178
 179         r = dss_init_platform_driver();
 180         if (r) {
 181                 DSSERR("Failed to initialize DSS platform driver\n");
 182                 goto err_dss;
 183         }
 184
 185         /* keep clocks enabled to prevent context saves/restores during init */
 186         dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
 187
 188         r = rfbi_init_platform_driver();
 189         if (r) {
 190                 DSSERR("Failed to initialize rfbi platform driver\n");
 191                 goto err_rfbi;
 192         }
 193
 194         r = dpi_init(pdev);
 195         if (r) {
 196                 DSSERR("Failed to initialize dpi\n");
 197                 goto err_dpi;
 198         }
 199
 200         r = dispc_init_platform_driver();
 201         if (r) {
 202                 DSSERR("Failed to initialize dispc platform driver\n");
 203                 goto err_dispc;
 204         }
 205
 206         r = venc_init_platform_driver();
 207         if (r) {
 208                 DSSERR("Failed to initialize venc platform driver\n");
 209                 goto err_venc;
 210         }
 211
 212         if (cpu_is_omap34xx()) {
 213                 r = sdi_init();
 214                 if (r) {
 215                         DSSERR("Failed to initialize SDI\n");
 216                         goto err_sdi;
 217                 }
 218
 219                 r = dsi_init_platform_driver();
 220                 if (r) {
 221                         DSSERR("Failed to initialize DSI platform driver\n");
 222                         goto err_dsi;
 223                 }
 224         }
 225
 226         r = dss_initialize_debugfs();
 227         if (r)
 228                 goto err_debugfs;
 229
 230         for (i = 0; i < pdata->num_devices; ++i) {
 231                 struct omap_dss_device *dssdev = pdata->devices[i];
 232
 233                 r = omap_dss_register_device(dssdev);
 234                 if (r) {
 235                         DSSERR("device %d %s register failed %d\n", i,
 236                                 dssdev->name ?: "unnamed", r);
 237
 238                         while (--i >= 0)
 239                                 omap_dss_unregister_device(pdata->devices[i]);
 240
 241                         goto err_register;
 242                 }
 243
 244                 if (def_disp_name && strcmp(def_disp_name, dssdev->name) == 0)
 245                         pdata->default_device = dssdev;
 246         }
 247
 248         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
 249
 250         return 0;
 251
 252 err_register:
 253         dss_uninitialize_debugfs();
 254 err_debugfs:
 255         if (cpu_is_omap34xx())
 256                 dsi_uninit_platform_driver();
 257 err_dsi:
 258         if (cpu_is_omap34xx())
 259                 sdi_exit();
 260 err_sdi:
 261         venc_uninit_platform_driver();
 262 err_venc:
 263         dispc_uninit_platform_driver();
 264 err_dispc:
 265         dpi_exit();
 266 err_dpi:
 267         rfbi_uninit_platform_driver();
 268 err_rfbi:
 269         dss_uninit_platform_driver();
 270 err_dss:
 271
 272         return r;
 273 }
 274
 275 static int omap_dss_remove(struct platform_device *pdev)
 276 {
 277         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 278         int i;
 279
 280         dss_uninitialize_debugfs();
 281
 282         venc_uninit_platform_driver();
 283         dispc_uninit_platform_driver();
 284         dpi_exit();
 285         rfbi_uninit_platform_driver();
 286         if (cpu_is_omap34xx()) {
 287                 dsi_uninit_platform_driver();
 288                 sdi_exit();
 289         }
 290
 291         dss_uninit_platform_driver();
 292
 293         dss_uninit_overlays(pdev);
 294         dss_uninit_overlay_managers(pdev);
 295
 296         for (i = 0; i < pdata->num_devices; ++i)
 297                 omap_dss_unregister_device(pdata->devices[i]);
 298
 299         return 0;
 300 }
 301
 302 static void omap_dss_shutdown(struct platform_device *pdev)
 303 {
 304         DSSDBG("shutdown\n");
 305         dss_disable_all_devices();
 306 }
 307
 308 static int omap_dss_suspend(struct platform_device *pdev, pm_message_t state)
 309 {
 310         DSSDBG("suspend %d\n", state.event);
 311
 312         return dss_suspend_all_devices();
 313 }
 314
 315 static int omap_dss_resume(struct platform_device *pdev)
 316 {
 317         DSSDBG("resume\n");
 318
 319         return dss_resume_all_devices();
 320 }
 321
 322 static struct platform_driver omap_dss_driver = {
 323         .probe          = omap_dss_probe,
 324         .remove         = omap_dss_remove,
 325         .shutdown       = omap_dss_shutdown,
 326         .suspend        = omap_dss_suspend,
 327         .resume         = omap_dss_resume,
 328         .driver         = {
 329                 .name   = "omapdss",
 330                 .owner  = THIS_MODULE,
 331         },
 332 };
 333
 334 /* BUS */
 335 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 336 {
 337         struct omap_dss_device *dssdev = to_dss_device(dev);
 338
 339         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 340                         dev_name(dev), dssdev->driver_name, driver->name);
 341
 342         return strcmp(dssdev->driver_name, driver->name) == 0;
 343 }
 344
 345 static ssize_t device_name_show(struct device *dev,
 346                 struct device_attribute *attr, char *buf)
 347 {
 348         struct omap_dss_device *dssdev = to_dss_device(dev);
 349         return snprintf(buf, PAGE_SIZE, "%s\n",
 350                         dssdev->name ?
 351                         dssdev->name : "");
 352 }
 353
 354 static struct device_attribute default_dev_attrs[] = {
 355         __ATTR(name, S_IRUGO, device_name_show, NULL),
 356         __ATTR_NULL,
 357 };
 358
 359 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 360 {
 361         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 362         return snprintf(buf, PAGE_SIZE, "%s\n",
 363                         dssdrv->driver.name ?
 364                         dssdrv->driver.name : "");
 365 }
 366 static struct driver_attribute default_drv_attrs[] = {
 367         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 368         __ATTR_NULL,
 369 };
 370
 371 static struct bus_type dss_bus_type = {
 372         .name = "omapdss",
 373         .match = dss_bus_match,
 374         .dev_attrs = default_dev_attrs,
 375         .drv_attrs = default_drv_attrs,
 376 };
 377
 378 static void dss_bus_release(struct device *dev)
 379 {
 380         DSSDBG("bus_release\n");
 381 }
 382
 383 static struct device dss_bus = {
 384         .release = dss_bus_release,
 385 };
 386
 387 struct bus_type *dss_get_bus(void)
 388 {
 389         return &dss_bus_type;
 390 }
 391
 392 /* DRIVER */
 393 static int dss_driver_probe(struct device *dev)
 394 {
 395         int r;
 396         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 397         struct omap_dss_device *dssdev = to_dss_device(dev);
 398         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 399         bool force;
 400
 401         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 402                                 dev_name(dev), dssdev->driver_name,
 403                                 dssdrv->driver.name);
 404
 405         dss_init_device(core.pdev, dssdev);
 406
 407         force = pdata->default_device == dssdev;
 408         dss_recheck_connections(dssdev, force);
 409
 410         r = dssdrv->probe(dssdev);
 411
 412         if (r) {
 413                 DSSERR("driver probe failed: %d\n", r);
 414                 dss_uninit_device(core.pdev, dssdev);
 415                 return r;
 416         }
 417
 418         DSSDBG("probe done for device %s\n", dev_name(dev));
 419
 420         dssdev->driver = dssdrv;
 421
 422         return 0;
 423 }
 424
 425 static int dss_driver_remove(struct device *dev)
 426 {
 427         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 428         struct omap_dss_device *dssdev = to_dss_device(dev);
 429
 430         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 431                         dssdev->driver_name);
 432
 433         dssdrv->remove(dssdev);
 434
 435         dss_uninit_device(core.pdev, dssdev);
 436
 437         dssdev->driver = NULL;
 438
 439         return 0;
 440 }
 441
 442 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 443 {
 444         dssdriver->driver.bus = &dss_bus_type;
 445         dssdriver->driver.probe = dss_driver_probe;
 446         dssdriver->driver.remove = dss_driver_remove;
 447
 448         if (dssdriver->get_resolution == NULL)
 449                 dssdriver->get_resolution = omapdss_default_get_resolution;
 450         if (dssdriver->get_recommended_bpp == NULL)
 451                 dssdriver->get_recommended_bpp =
 452                         omapdss_default_get_recommended_bpp;
 453
 454         return driver_register(&dssdriver->driver);
 455 }
 456 EXPORT_SYMBOL(omap_dss_register_driver);
 457
 458 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 459 {
 460         driver_unregister(&dssdriver->driver);
 461 }
 462 EXPORT_SYMBOL(omap_dss_unregister_driver);
 463
 464 /* DEVICE */
 465 static void reset_device(struct device *dev, int check)
 466 {
 467         u8 *dev_p = (u8 *)dev;
 468         u8 *dev_end = dev_p + sizeof(*dev);
 469         void *saved_pdata;
 470
 471         saved_pdata = dev->platform_data;
 472         if (check) {
 473                 /*
 474                  * Check if there is any other setting than platform_data
 475                  * in struct device; warn that these will be reset by our
 476                  * init.
 477                  */
 478                 dev->platform_data = NULL;
 479                 while (dev_p < dev_end) {
 480                         if (*dev_p) {
 481                                 WARN("%s: struct device fields will be "
 482                                                 "discarded\n",
 483                                      __func__);
 484                                 break;
 485                         }
 486                         dev_p++;
 487                 }
 488         }
 489         memset(dev, 0, sizeof(*dev));
 490         dev->platform_data = saved_pdata;
 491 }
 492
 493
 494 static void omap_dss_dev_release(struct device *dev)
 495 {
 496         reset_device(dev, 0);
 497 }
 498
 499 int omap_dss_register_device(struct omap_dss_device *dssdev)
 500 {
 501         static int dev_num;
 502
 503         WARN_ON(!dssdev->driver_name);
 504
 505         reset_device(&dssdev->dev, 1);
 506         dssdev->dev.bus = &dss_bus_type;
 507         dssdev->dev.parent = &dss_bus;
 508         dssdev->dev.release = omap_dss_dev_release;
 509         dev_set_name(&dssdev->dev, "display%d", dev_num++);
 510         return device_register(&dssdev->dev);
 511 }
 512
 513 void omap_dss_unregister_device(struct omap_dss_device *dssdev)
 514 {
 515         device_unregister(&dssdev->dev);
 516 }
 517
 518 /* BUS */
 519 static int omap_dss_bus_register(void)
 520 {
 521         int r;
 522
 523         r = bus_register(&dss_bus_type);
 524         if (r) {
 525                 DSSERR("bus register failed\n");
 526                 return r;
 527         }
 528
 529         dev_set_name(&dss_bus, "omapdss");
 530         r = device_register(&dss_bus);
 531         if (r) {
 532                 DSSERR("bus driver register failed\n");
 533                 bus_unregister(&dss_bus_type);
 534                 return r;
 535         }
 536
 537         return 0;
 538 }
 539
 540 /* INIT */
 541
 542 #ifdef CONFIG_OMAP2_DSS_MODULE
 543 static void omap_dss_bus_unregister(void)
 544 {
 545         device_unregister(&dss_bus);
 546
 547         bus_unregister(&dss_bus_type);
 548 }
 549
 550 static int __init omap_dss_init(void)
 551 {
 552         int r;
 553
 554         r = omap_dss_bus_register();
 555         if (r)
 556                 return r;
 557
 558         r = platform_driver_register(&omap_dss_driver);
 559         if (r) {
 560                 omap_dss_bus_unregister();
 561                 return r;
 562         }
 563
 564         return 0;
 565 }
 566
 567 static void __exit omap_dss_exit(void)
 568 {
 569         if (core.vdds_dsi_reg != NULL) {
 570                 regulator_put(core.vdds_dsi_reg);
 571                 core.vdds_dsi_reg = NULL;
 572         }
 573
 574         if (core.vdds_sdi_reg != NULL) {
 575                 regulator_put(core.vdds_sdi_reg);
 576                 core.vdds_sdi_reg = NULL;
 577         }
 578
 579         platform_driver_unregister(&omap_dss_driver);
 580
 581         omap_dss_bus_unregister();
 582 }
 583
 584 module_init(omap_dss_init);
 585 module_exit(omap_dss_exit);
 586 #else
 587 static int __init omap_dss_init(void)
 588 {
 589         return omap_dss_bus_register();
 590 }
 591
 592 static int __init omap_dss_init2(void)
 593 {
 594         return platform_driver_register(&omap_dss_driver);
 595 }
 596
 597 core_initcall(omap_dss_init);
 598 device_initcall(omap_dss_init2);
 599 #endif
 600
 601 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 602 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 603 MODULE_LICENSE("GPL v2");
 604