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 = dispc_init_platform_driver();
 195         if (r) {
 196                 DSSERR("Failed to initialize dispc platform driver\n");
 197                 goto err_dispc;
 198         }
 199
 200         r = venc_init_platform_driver();
 201         if (r) {
 202                 DSSERR("Failed to initialize venc platform driver\n");
 203                 goto err_venc;
 204         }
 205
 206         r = dsi_init_platform_driver();
 207         if (r) {
 208                 DSSERR("Failed to initialize DSI platform driver\n");
 209                 goto err_dsi;
 210         }
 211
 212         r = hdmi_init_platform_driver();
 213         if (r) {
 214                 DSSERR("Failed to initialize hdmi\n");
 215                 goto err_hdmi;
 216         }
 217
 218         r = dss_initialize_debugfs();
 219         if (r)
 220                 goto err_debugfs;
 221
 222         for (i = 0; i < pdata->num_devices; ++i) {
 223                 struct omap_dss_device *dssdev = pdata->devices[i];
 224
 225                 r = omap_dss_register_device(dssdev);
 226                 if (r) {
 227                         DSSERR("device %d %s register failed %d\n", i,
 228                                 dssdev->name ?: "unnamed", r);
 229
 230                         while (--i >= 0)
 231                                 omap_dss_unregister_device(pdata->devices[i]);
 232
 233                         goto err_register;
 234                 }
 235
 236                 if (def_disp_name && strcmp(def_disp_name, dssdev->name) == 0)
 237                         pdata->default_device = dssdev;
 238         }
 239
 240         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
 241
 242         return 0;
 243
 244 err_register:
 245         dss_uninitialize_debugfs();
 246 err_debugfs:
 247         hdmi_uninit_platform_driver();
 248 err_hdmi:
 249         dsi_uninit_platform_driver();
 250 err_dsi:
 251         venc_uninit_platform_driver();
 252 err_venc:
 253         dispc_uninit_platform_driver();
 254 err_dispc:
 255         rfbi_uninit_platform_driver();
 256 err_rfbi:
 257         dss_uninit_platform_driver();
 258 err_dss:
 259
 260         return r;
 261 }
 262
 263 static int omap_dss_remove(struct platform_device *pdev)
 264 {
 265         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 266         int i;
 267
 268         dss_uninitialize_debugfs();
 269
 270         venc_uninit_platform_driver();
 271         dispc_uninit_platform_driver();
 272         rfbi_uninit_platform_driver();
 273         dsi_uninit_platform_driver();
 274         hdmi_uninit_platform_driver();
 275         dss_uninit_platform_driver();
 276
 277         dss_uninit_overlays(pdev);
 278         dss_uninit_overlay_managers(pdev);
 279
 280         for (i = 0; i < pdata->num_devices; ++i)
 281                 omap_dss_unregister_device(pdata->devices[i]);
 282
 283         return 0;
 284 }
 285
 286 static void omap_dss_shutdown(struct platform_device *pdev)
 287 {
 288         DSSDBG("shutdown\n");
 289         dss_disable_all_devices();
 290 }
 291
 292 static int omap_dss_suspend(struct platform_device *pdev, pm_message_t state)
 293 {
 294         DSSDBG("suspend %d\n", state.event);
 295
 296         return dss_suspend_all_devices();
 297 }
 298
 299 static int omap_dss_resume(struct platform_device *pdev)
 300 {
 301         DSSDBG("resume\n");
 302
 303         return dss_resume_all_devices();
 304 }
 305
 306 static struct platform_driver omap_dss_driver = {
 307         .probe          = omap_dss_probe,
 308         .remove         = omap_dss_remove,
 309         .shutdown       = omap_dss_shutdown,
 310         .suspend        = omap_dss_suspend,
 311         .resume         = omap_dss_resume,
 312         .driver         = {
 313                 .name   = "omapdss",
 314                 .owner  = THIS_MODULE,
 315         },
 316 };
 317
 318 /* BUS */
 319 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 320 {
 321         struct omap_dss_device *dssdev = to_dss_device(dev);
 322
 323         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 324                         dev_name(dev), dssdev->driver_name, driver->name);
 325
 326         return strcmp(dssdev->driver_name, driver->name) == 0;
 327 }
 328
 329 static ssize_t device_name_show(struct device *dev,
 330                 struct device_attribute *attr, char *buf)
 331 {
 332         struct omap_dss_device *dssdev = to_dss_device(dev);
 333         return snprintf(buf, PAGE_SIZE, "%s\n",
 334                         dssdev->name ?
 335                         dssdev->name : "");
 336 }
 337
 338 static struct device_attribute default_dev_attrs[] = {
 339         __ATTR(name, S_IRUGO, device_name_show, NULL),
 340         __ATTR_NULL,
 341 };
 342
 343 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 344 {
 345         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 346         return snprintf(buf, PAGE_SIZE, "%s\n",
 347                         dssdrv->driver.name ?
 348                         dssdrv->driver.name : "");
 349 }
 350 static struct driver_attribute default_drv_attrs[] = {
 351         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 352         __ATTR_NULL,
 353 };
 354
 355 static struct bus_type dss_bus_type = {
 356         .name = "omapdss",
 357         .match = dss_bus_match,
 358         .dev_attrs = default_dev_attrs,
 359         .drv_attrs = default_drv_attrs,
 360 };
 361
 362 static void dss_bus_release(struct device *dev)
 363 {
 364         DSSDBG("bus_release\n");
 365 }
 366
 367 static struct device dss_bus = {
 368         .release = dss_bus_release,
 369 };
 370
 371 struct bus_type *dss_get_bus(void)
 372 {
 373         return &dss_bus_type;
 374 }
 375
 376 /* DRIVER */
 377 static int dss_driver_probe(struct device *dev)
 378 {
 379         int r;
 380         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 381         struct omap_dss_device *dssdev = to_dss_device(dev);
 382         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 383         bool force;
 384
 385         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 386                                 dev_name(dev), dssdev->driver_name,
 387                                 dssdrv->driver.name);
 388
 389         dss_init_device(core.pdev, dssdev);
 390
 391         force = pdata->default_device == dssdev;
 392         dss_recheck_connections(dssdev, force);
 393
 394         r = dssdrv->probe(dssdev);
 395
 396         if (r) {
 397                 DSSERR("driver probe failed: %d\n", r);
 398                 dss_uninit_device(core.pdev, dssdev);
 399                 return r;
 400         }
 401
 402         DSSDBG("probe done for device %s\n", dev_name(dev));
 403
 404         dssdev->driver = dssdrv;
 405
 406         return 0;
 407 }
 408
 409 static int dss_driver_remove(struct device *dev)
 410 {
 411         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 412         struct omap_dss_device *dssdev = to_dss_device(dev);
 413
 414         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 415                         dssdev->driver_name);
 416
 417         dssdrv->remove(dssdev);
 418
 419         dss_uninit_device(core.pdev, dssdev);
 420
 421         dssdev->driver = NULL;
 422
 423         return 0;
 424 }
 425
 426 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 427 {
 428         dssdriver->driver.bus = &dss_bus_type;
 429         dssdriver->driver.probe = dss_driver_probe;
 430         dssdriver->driver.remove = dss_driver_remove;
 431
 432         if (dssdriver->get_resolution == NULL)
 433                 dssdriver->get_resolution = omapdss_default_get_resolution;
 434         if (dssdriver->get_recommended_bpp == NULL)
 435                 dssdriver->get_recommended_bpp =
 436                         omapdss_default_get_recommended_bpp;
 437
 438         return driver_register(&dssdriver->driver);
 439 }
 440 EXPORT_SYMBOL(omap_dss_register_driver);
 441
 442 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 443 {
 444         driver_unregister(&dssdriver->driver);
 445 }
 446 EXPORT_SYMBOL(omap_dss_unregister_driver);
 447
 448 /* DEVICE */
 449 static void reset_device(struct device *dev, int check)
 450 {
 451         u8 *dev_p = (u8 *)dev;
 452         u8 *dev_end = dev_p + sizeof(*dev);
 453         void *saved_pdata;
 454
 455         saved_pdata = dev->platform_data;
 456         if (check) {
 457                 /*
 458                  * Check if there is any other setting than platform_data
 459                  * in struct device; warn that these will be reset by our
 460                  * init.
 461                  */
 462                 dev->platform_data = NULL;
 463                 while (dev_p < dev_end) {
 464                         if (*dev_p) {
 465                                 WARN("%s: struct device fields will be "
 466                                                 "discarded\n",
 467                                      __func__);
 468                                 break;
 469                         }
 470                         dev_p++;
 471                 }
 472         }
 473         memset(dev, 0, sizeof(*dev));
 474         dev->platform_data = saved_pdata;
 475 }
 476
 477
 478 static void omap_dss_dev_release(struct device *dev)
 479 {
 480         reset_device(dev, 0);
 481 }
 482
 483 int omap_dss_register_device(struct omap_dss_device *dssdev)
 484 {
 485         static int dev_num;
 486
 487         WARN_ON(!dssdev->driver_name);
 488
 489         reset_device(&dssdev->dev, 1);
 490         dssdev->dev.bus = &dss_bus_type;
 491         dssdev->dev.parent = &dss_bus;
 492         dssdev->dev.release = omap_dss_dev_release;
 493         dev_set_name(&dssdev->dev, "display%d", dev_num++);
 494         return device_register(&dssdev->dev);
 495 }
 496
 497 void omap_dss_unregister_device(struct omap_dss_device *dssdev)
 498 {
 499         device_unregister(&dssdev->dev);
 500 }
 501
 502 /* BUS */
 503 static int omap_dss_bus_register(void)
 504 {
 505         int r;
 506
 507         r = bus_register(&dss_bus_type);
 508         if (r) {
 509                 DSSERR("bus register failed\n");
 510                 return r;
 511         }
 512
 513         dev_set_name(&dss_bus, "omapdss");
 514         r = device_register(&dss_bus);
 515         if (r) {
 516                 DSSERR("bus driver register failed\n");
 517                 bus_unregister(&dss_bus_type);
 518                 return r;
 519         }
 520
 521         return 0;
 522 }
 523
 524 /* INIT */
 525
 526 #ifdef CONFIG_OMAP2_DSS_MODULE
 527 static void omap_dss_bus_unregister(void)
 528 {
 529         device_unregister(&dss_bus);
 530
 531         bus_unregister(&dss_bus_type);
 532 }
 533
 534 static int __init omap_dss_init(void)
 535 {
 536         int r;
 537
 538         r = omap_dss_bus_register();
 539         if (r)
 540                 return r;
 541
 542         r = platform_driver_register(&omap_dss_driver);
 543         if (r) {
 544                 omap_dss_bus_unregister();
 545                 return r;
 546         }
 547
 548         return 0;
 549 }
 550
 551 static void __exit omap_dss_exit(void)
 552 {
 553         if (core.vdds_dsi_reg != NULL) {
 554                 regulator_put(core.vdds_dsi_reg);
 555                 core.vdds_dsi_reg = NULL;
 556         }
 557
 558         if (core.vdds_sdi_reg != NULL) {
 559                 regulator_put(core.vdds_sdi_reg);
 560                 core.vdds_sdi_reg = NULL;
 561         }
 562
 563         platform_driver_unregister(&omap_dss_driver);
 564
 565         omap_dss_bus_unregister();
 566 }
 567
 568 module_init(omap_dss_init);
 569 module_exit(omap_dss_exit);
 570 #else
 571 static int __init omap_dss_init(void)
 572 {
 573         return omap_dss_bus_register();
 574 }
 575
 576 static int __init omap_dss_init2(void)
 577 {
 578         return platform_driver_register(&omap_dss_driver);
 579 }
 580
 581 core_initcall(omap_dss_init);
 582 device_initcall(omap_dss_init2);
 583 #endif
 584
 585 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 586 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 587 MODULE_LICENSE("GPL v2");
 588