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_init_platform_driver();
 187         if (r) {
 188                 DSSERR("Failed to initialize DSS platform driver\n");
 189                 goto err_dss;
 190         }
 191
 192         r = dispc_init_platform_driver();
 193         if (r) {
 194                 DSSERR("Failed to initialize dispc platform driver\n");
 195                 goto err_dispc;
 196         }
 197
 198         r = rfbi_init_platform_driver();
 199         if (r) {
 200                 DSSERR("Failed to initialize rfbi platform driver\n");
 201                 goto err_rfbi;
 202         }
 203
 204         r = venc_init_platform_driver();
 205         if (r) {
 206                 DSSERR("Failed to initialize venc platform driver\n");
 207                 goto err_venc;
 208         }
 209
 210         r = dsi_init_platform_driver();
 211         if (r) {
 212                 DSSERR("Failed to initialize DSI platform driver\n");
 213                 goto err_dsi;
 214         }
 215
 216         r = hdmi_init_platform_driver();
 217         if (r) {
 218                 DSSERR("Failed to initialize hdmi\n");
 219                 goto err_hdmi;
 220         }
 221
 222         r = dss_initialize_debugfs();
 223         if (r)
 224                 goto err_debugfs;
 225
 226         for (i = 0; i < pdata->num_devices; ++i) {
 227                 struct omap_dss_device *dssdev = pdata->devices[i];
 228
 229                 r = omap_dss_register_device(dssdev);
 230                 if (r) {
 231                         DSSERR("device %d %s register failed %d\n", i,
 232                                 dssdev->name ?: "unnamed", r);
 233
 234                         while (--i >= 0)
 235                                 omap_dss_unregister_device(pdata->devices[i]);
 236
 237                         goto err_register;
 238                 }
 239
 240                 if (def_disp_name && strcmp(def_disp_name, dssdev->name) == 0)
 241                         pdata->default_device = dssdev;
 242         }
 243
 244         return 0;
 245
 246 err_register:
 247         dss_uninitialize_debugfs();
 248 err_debugfs:
 249         hdmi_uninit_platform_driver();
 250 err_hdmi:
 251         dsi_uninit_platform_driver();
 252 err_dsi:
 253         venc_uninit_platform_driver();
 254 err_venc:
 255         dispc_uninit_platform_driver();
 256 err_dispc:
 257         rfbi_uninit_platform_driver();
 258 err_rfbi:
 259         dss_uninit_platform_driver();
 260 err_dss:
 261
 262         return r;
 263 }
 264
 265 static int omap_dss_remove(struct platform_device *pdev)
 266 {
 267         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 268         int i;
 269
 270         dss_uninitialize_debugfs();
 271
 272         hdmi_uninit_platform_driver();
 273         dsi_uninit_platform_driver();
 274         venc_uninit_platform_driver();
 275         rfbi_uninit_platform_driver();
 276         dispc_uninit_platform_driver();
 277         dss_uninit_platform_driver();
 278
 279         dss_uninit_overlays(pdev);
 280         dss_uninit_overlay_managers(pdev);
 281
 282         for (i = 0; i < pdata->num_devices; ++i)
 283                 omap_dss_unregister_device(pdata->devices[i]);
 284
 285         return 0;
 286 }
 287
 288 static void omap_dss_shutdown(struct platform_device *pdev)
 289 {
 290         DSSDBG("shutdown\n");
 291         dss_disable_all_devices();
 292 }
 293
 294 static int omap_dss_suspend(struct platform_device *pdev, pm_message_t state)
 295 {
 296         DSSDBG("suspend %d\n", state.event);
 297
 298         return dss_suspend_all_devices();
 299 }
 300
 301 static int omap_dss_resume(struct platform_device *pdev)
 302 {
 303         DSSDBG("resume\n");
 304
 305         return dss_resume_all_devices();
 306 }
 307
 308 static struct platform_driver omap_dss_driver = {
 309         .probe          = omap_dss_probe,
 310         .remove         = omap_dss_remove,
 311         .shutdown       = omap_dss_shutdown,
 312         .suspend        = omap_dss_suspend,
 313         .resume         = omap_dss_resume,
 314         .driver         = {
 315                 .name   = "omapdss",
 316                 .owner  = THIS_MODULE,
 317         },
 318 };
 319
 320 /* BUS */
 321 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 322 {
 323         struct omap_dss_device *dssdev = to_dss_device(dev);
 324
 325         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 326                         dev_name(dev), dssdev->driver_name, driver->name);
 327
 328         return strcmp(dssdev->driver_name, driver->name) == 0;
 329 }
 330
 331 static ssize_t device_name_show(struct device *dev,
 332                 struct device_attribute *attr, char *buf)
 333 {
 334         struct omap_dss_device *dssdev = to_dss_device(dev);
 335         return snprintf(buf, PAGE_SIZE, "%s\n",
 336                         dssdev->name ?
 337                         dssdev->name : "");
 338 }
 339
 340 static struct device_attribute default_dev_attrs[] = {
 341         __ATTR(name, S_IRUGO, device_name_show, NULL),
 342         __ATTR_NULL,
 343 };
 344
 345 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 346 {
 347         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 348         return snprintf(buf, PAGE_SIZE, "%s\n",
 349                         dssdrv->driver.name ?
 350                         dssdrv->driver.name : "");
 351 }
 352 static struct driver_attribute default_drv_attrs[] = {
 353         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 354         __ATTR_NULL,
 355 };
 356
 357 static struct bus_type dss_bus_type = {
 358         .name = "omapdss",
 359         .match = dss_bus_match,
 360         .dev_attrs = default_dev_attrs,
 361         .drv_attrs = default_drv_attrs,
 362 };
 363
 364 static void dss_bus_release(struct device *dev)
 365 {
 366         DSSDBG("bus_release\n");
 367 }
 368
 369 static struct device dss_bus = {
 370         .release = dss_bus_release,
 371 };
 372
 373 struct bus_type *dss_get_bus(void)
 374 {
 375         return &dss_bus_type;
 376 }
 377
 378 /* DRIVER */
 379 static int dss_driver_probe(struct device *dev)
 380 {
 381         int r;
 382         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 383         struct omap_dss_device *dssdev = to_dss_device(dev);
 384         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 385         bool force;
 386
 387         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 388                                 dev_name(dev), dssdev->driver_name,
 389                                 dssdrv->driver.name);
 390
 391         dss_init_device(core.pdev, dssdev);
 392
 393         force = pdata->default_device == dssdev;
 394         dss_recheck_connections(dssdev, force);
 395
 396         r = dssdrv->probe(dssdev);
 397
 398         if (r) {
 399                 DSSERR("driver probe failed: %d\n", r);
 400                 dss_uninit_device(core.pdev, dssdev);
 401                 return r;
 402         }
 403
 404         DSSDBG("probe done for device %s\n", dev_name(dev));
 405
 406         dssdev->driver = dssdrv;
 407
 408         return 0;
 409 }
 410
 411 static int dss_driver_remove(struct device *dev)
 412 {
 413         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 414         struct omap_dss_device *dssdev = to_dss_device(dev);
 415
 416         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 417                         dssdev->driver_name);
 418
 419         dssdrv->remove(dssdev);
 420
 421         dss_uninit_device(core.pdev, dssdev);
 422
 423         dssdev->driver = NULL;
 424
 425         return 0;
 426 }
 427
 428 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 429 {
 430         dssdriver->driver.bus = &dss_bus_type;
 431         dssdriver->driver.probe = dss_driver_probe;
 432         dssdriver->driver.remove = dss_driver_remove;
 433
 434         if (dssdriver->get_resolution == NULL)
 435                 dssdriver->get_resolution = omapdss_default_get_resolution;
 436         if (dssdriver->get_recommended_bpp == NULL)
 437                 dssdriver->get_recommended_bpp =
 438                         omapdss_default_get_recommended_bpp;
 439
 440         return driver_register(&dssdriver->driver);
 441 }
 442 EXPORT_SYMBOL(omap_dss_register_driver);
 443
 444 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 445 {
 446         driver_unregister(&dssdriver->driver);
 447 }
 448 EXPORT_SYMBOL(omap_dss_unregister_driver);
 449
 450 /* DEVICE */
 451 static void reset_device(struct device *dev, int check)
 452 {
 453         u8 *dev_p = (u8 *)dev;
 454         u8 *dev_end = dev_p + sizeof(*dev);
 455         void *saved_pdata;
 456
 457         saved_pdata = dev->platform_data;
 458         if (check) {
 459                 /*
 460                  * Check if there is any other setting than platform_data
 461                  * in struct device; warn that these will be reset by our
 462                  * init.
 463                  */
 464                 dev->platform_data = NULL;
 465                 while (dev_p < dev_end) {
 466                         if (*dev_p) {
 467                                 WARN("%s: struct device fields will be "
 468                                                 "discarded\n",
 469                                      __func__);
 470                                 break;
 471                         }
 472                         dev_p++;
 473                 }
 474         }
 475         memset(dev, 0, sizeof(*dev));
 476         dev->platform_data = saved_pdata;
 477 }
 478
 479
 480 static void omap_dss_dev_release(struct device *dev)
 481 {
 482         reset_device(dev, 0);
 483 }
 484
 485 static int omap_dss_register_device(struct omap_dss_device *dssdev)
 486 {
 487         static int dev_num;
 488
 489         WARN_ON(!dssdev->driver_name);
 490
 491         reset_device(&dssdev->dev, 1);
 492         dssdev->dev.bus = &dss_bus_type;
 493         dssdev->dev.parent = &dss_bus;
 494         dssdev->dev.release = omap_dss_dev_release;
 495         dev_set_name(&dssdev->dev, "display%d", dev_num++);
 496         return device_register(&dssdev->dev);
 497 }
 498
 499 static void omap_dss_unregister_device(struct omap_dss_device *dssdev)
 500 {
 501         device_unregister(&dssdev->dev);
 502 }
 503
 504 /* BUS */
 505 static int omap_dss_bus_register(void)
 506 {
 507         int r;
 508
 509         r = bus_register(&dss_bus_type);
 510         if (r) {
 511                 DSSERR("bus register failed\n");
 512                 return r;
 513         }
 514
 515         dev_set_name(&dss_bus, "omapdss");
 516         r = device_register(&dss_bus);
 517         if (r) {
 518                 DSSERR("bus driver register failed\n");
 519                 bus_unregister(&dss_bus_type);
 520                 return r;
 521         }
 522
 523         return 0;
 524 }
 525
 526 /* INIT */
 527
 528 #ifdef CONFIG_OMAP2_DSS_MODULE
 529 static void omap_dss_bus_unregister(void)
 530 {
 531         device_unregister(&dss_bus);
 532
 533         bus_unregister(&dss_bus_type);
 534 }
 535
 536 static int __init omap_dss_init(void)
 537 {
 538         int r;
 539
 540         r = omap_dss_bus_register();
 541         if (r)
 542                 return r;
 543
 544         r = platform_driver_register(&omap_dss_driver);
 545         if (r) {
 546                 omap_dss_bus_unregister();
 547                 return r;
 548         }
 549
 550         return 0;
 551 }
 552
 553 static void __exit omap_dss_exit(void)
 554 {
 555         if (core.vdds_dsi_reg != NULL) {
 556                 regulator_put(core.vdds_dsi_reg);
 557                 core.vdds_dsi_reg = NULL;
 558         }
 559
 560         if (core.vdds_sdi_reg != NULL) {
 561                 regulator_put(core.vdds_sdi_reg);
 562                 core.vdds_sdi_reg = NULL;
 563         }
 564
 565         platform_driver_unregister(&omap_dss_driver);
 566
 567         omap_dss_bus_unregister();
 568 }
 569
 570 module_init(omap_dss_init);
 571 module_exit(omap_dss_exit);
 572 #else
 573 static int __init omap_dss_init(void)
 574 {
 575         return omap_dss_bus_register();
 576 }
 577
 578 static int __init omap_dss_init2(void)
 579 {
 580         return platform_driver_register(&omap_dss_driver);
 581 }
 582
 583 core_initcall(omap_dss_init);
 584 device_initcall(omap_dss_init2);
 585 #endif
 586
 587 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 588 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 589 MODULE_LICENSE("GPL v2");
 590