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         if (cpu_is_omap34xx()) {
 207                 r = dsi_init_platform_driver();
 208                 if (r) {
 209                         DSSERR("Failed to initialize DSI platform driver\n");
 210                         goto err_dsi;
 211                 }
 212         }
 213
 214         r = dss_initialize_debugfs();
 215         if (r)
 216                 goto err_debugfs;
 217
 218         for (i = 0; i < pdata->num_devices; ++i) {
 219                 struct omap_dss_device *dssdev = pdata->devices[i];
 220
 221                 r = omap_dss_register_device(dssdev);
 222                 if (r) {
 223                         DSSERR("device %d %s register failed %d\n", i,
 224                                 dssdev->name ?: "unnamed", r);
 225
 226                         while (--i >= 0)
 227                                 omap_dss_unregister_device(pdata->devices[i]);
 228
 229                         goto err_register;
 230                 }
 231
 232                 if (def_disp_name && strcmp(def_disp_name, dssdev->name) == 0)
 233                         pdata->default_device = dssdev;
 234         }
 235
 236         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
 237
 238         return 0;
 239
 240 err_register:
 241         dss_uninitialize_debugfs();
 242 err_debugfs:
 243         if (cpu_is_omap34xx())
 244                 dsi_uninit_platform_driver();
 245 err_dsi:
 246         venc_uninit_platform_driver();
 247 err_venc:
 248         dispc_uninit_platform_driver();
 249 err_dispc:
 250         rfbi_uninit_platform_driver();
 251 err_rfbi:
 252         dss_uninit_platform_driver();
 253 err_dss:
 254
 255         return r;
 256 }
 257
 258 static int omap_dss_remove(struct platform_device *pdev)
 259 {
 260         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 261         int i;
 262
 263         dss_uninitialize_debugfs();
 264
 265         venc_uninit_platform_driver();
 266         dispc_uninit_platform_driver();
 267         rfbi_uninit_platform_driver();
 268         if (cpu_is_omap34xx()) {
 269                 dsi_uninit_platform_driver();
 270         }
 271
 272         dss_uninit_platform_driver();
 273
 274         dss_uninit_overlays(pdev);
 275         dss_uninit_overlay_managers(pdev);
 276
 277         for (i = 0; i < pdata->num_devices; ++i)
 278                 omap_dss_unregister_device(pdata->devices[i]);
 279
 280         return 0;
 281 }
 282
 283 static void omap_dss_shutdown(struct platform_device *pdev)
 284 {
 285         DSSDBG("shutdown\n");
 286         dss_disable_all_devices();
 287 }
 288
 289 static int omap_dss_suspend(struct platform_device *pdev, pm_message_t state)
 290 {
 291         DSSDBG("suspend %d\n", state.event);
 292
 293         return dss_suspend_all_devices();
 294 }
 295
 296 static int omap_dss_resume(struct platform_device *pdev)
 297 {
 298         DSSDBG("resume\n");
 299
 300         return dss_resume_all_devices();
 301 }
 302
 303 static struct platform_driver omap_dss_driver = {
 304         .probe          = omap_dss_probe,
 305         .remove         = omap_dss_remove,
 306         .shutdown       = omap_dss_shutdown,
 307         .suspend        = omap_dss_suspend,
 308         .resume         = omap_dss_resume,
 309         .driver         = {
 310                 .name   = "omapdss",
 311                 .owner  = THIS_MODULE,
 312         },
 313 };
 314
 315 /* BUS */
 316 static int dss_bus_match(struct device *dev, struct device_driver *driver)
 317 {
 318         struct omap_dss_device *dssdev = to_dss_device(dev);
 319
 320         DSSDBG("bus_match. dev %s/%s, drv %s\n",
 321                         dev_name(dev), dssdev->driver_name, driver->name);
 322
 323         return strcmp(dssdev->driver_name, driver->name) == 0;
 324 }
 325
 326 static ssize_t device_name_show(struct device *dev,
 327                 struct device_attribute *attr, char *buf)
 328 {
 329         struct omap_dss_device *dssdev = to_dss_device(dev);
 330         return snprintf(buf, PAGE_SIZE, "%s\n",
 331                         dssdev->name ?
 332                         dssdev->name : "");
 333 }
 334
 335 static struct device_attribute default_dev_attrs[] = {
 336         __ATTR(name, S_IRUGO, device_name_show, NULL),
 337         __ATTR_NULL,
 338 };
 339
 340 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
 341 {
 342         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
 343         return snprintf(buf, PAGE_SIZE, "%s\n",
 344                         dssdrv->driver.name ?
 345                         dssdrv->driver.name : "");
 346 }
 347 static struct driver_attribute default_drv_attrs[] = {
 348         __ATTR(name, S_IRUGO, driver_name_show, NULL),
 349         __ATTR_NULL,
 350 };
 351
 352 static struct bus_type dss_bus_type = {
 353         .name = "omapdss",
 354         .match = dss_bus_match,
 355         .dev_attrs = default_dev_attrs,
 356         .drv_attrs = default_drv_attrs,
 357 };
 358
 359 static void dss_bus_release(struct device *dev)
 360 {
 361         DSSDBG("bus_release\n");
 362 }
 363
 364 static struct device dss_bus = {
 365         .release = dss_bus_release,
 366 };
 367
 368 struct bus_type *dss_get_bus(void)
 369 {
 370         return &dss_bus_type;
 371 }
 372
 373 /* DRIVER */
 374 static int dss_driver_probe(struct device *dev)
 375 {
 376         int r;
 377         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 378         struct omap_dss_device *dssdev = to_dss_device(dev);
 379         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 380         bool force;
 381
 382         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
 383                                 dev_name(dev), dssdev->driver_name,
 384                                 dssdrv->driver.name);
 385
 386         dss_init_device(core.pdev, dssdev);
 387
 388         force = pdata->default_device == dssdev;
 389         dss_recheck_connections(dssdev, force);
 390
 391         r = dssdrv->probe(dssdev);
 392
 393         if (r) {
 394                 DSSERR("driver probe failed: %d\n", r);
 395                 dss_uninit_device(core.pdev, dssdev);
 396                 return r;
 397         }
 398
 399         DSSDBG("probe done for device %s\n", dev_name(dev));
 400
 401         dssdev->driver = dssdrv;
 402
 403         return 0;
 404 }
 405
 406 static int dss_driver_remove(struct device *dev)
 407 {
 408         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
 409         struct omap_dss_device *dssdev = to_dss_device(dev);
 410
 411         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
 412                         dssdev->driver_name);
 413
 414         dssdrv->remove(dssdev);
 415
 416         dss_uninit_device(core.pdev, dssdev);
 417
 418         dssdev->driver = NULL;
 419
 420         return 0;
 421 }
 422
 423 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
 424 {
 425         dssdriver->driver.bus = &dss_bus_type;
 426         dssdriver->driver.probe = dss_driver_probe;
 427         dssdriver->driver.remove = dss_driver_remove;
 428
 429         if (dssdriver->get_resolution == NULL)
 430                 dssdriver->get_resolution = omapdss_default_get_resolution;
 431         if (dssdriver->get_recommended_bpp == NULL)
 432                 dssdriver->get_recommended_bpp =
 433                         omapdss_default_get_recommended_bpp;
 434
 435         return driver_register(&dssdriver->driver);
 436 }
 437 EXPORT_SYMBOL(omap_dss_register_driver);
 438
 439 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
 440 {
 441         driver_unregister(&dssdriver->driver);
 442 }
 443 EXPORT_SYMBOL(omap_dss_unregister_driver);
 444
 445 /* DEVICE */
 446 static void reset_device(struct device *dev, int check)
 447 {
 448         u8 *dev_p = (u8 *)dev;
 449         u8 *dev_end = dev_p + sizeof(*dev);
 450         void *saved_pdata;
 451
 452         saved_pdata = dev->platform_data;
 453         if (check) {
 454                 /*
 455                  * Check if there is any other setting than platform_data
 456                  * in struct device; warn that these will be reset by our
 457                  * init.
 458                  */
 459                 dev->platform_data = NULL;
 460                 while (dev_p < dev_end) {
 461                         if (*dev_p) {
 462                                 WARN("%s: struct device fields will be "
 463                                                 "discarded\n",
 464                                      __func__);
 465                                 break;
 466                         }
 467                         dev_p++;
 468                 }
 469         }
 470         memset(dev, 0, sizeof(*dev));
 471         dev->platform_data = saved_pdata;
 472 }
 473
 474
 475 static void omap_dss_dev_release(struct device *dev)
 476 {
 477         reset_device(dev, 0);
 478 }
 479
 480 int omap_dss_register_device(struct omap_dss_device *dssdev)
 481 {
 482         static int dev_num;
 483
 484         WARN_ON(!dssdev->driver_name);
 485
 486         reset_device(&dssdev->dev, 1);
 487         dssdev->dev.bus = &dss_bus_type;
 488         dssdev->dev.parent = &dss_bus;
 489         dssdev->dev.release = omap_dss_dev_release;
 490         dev_set_name(&dssdev->dev, "display%d", dev_num++);
 491         return device_register(&dssdev->dev);
 492 }
 493
 494 void omap_dss_unregister_device(struct omap_dss_device *dssdev)
 495 {
 496         device_unregister(&dssdev->dev);
 497 }
 498
 499 /* BUS */
 500 static int omap_dss_bus_register(void)
 501 {
 502         int r;
 503
 504         r = bus_register(&dss_bus_type);
 505         if (r) {
 506                 DSSERR("bus register failed\n");
 507                 return r;
 508         }
 509
 510         dev_set_name(&dss_bus, "omapdss");
 511         r = device_register(&dss_bus);
 512         if (r) {
 513                 DSSERR("bus driver register failed\n");
 514                 bus_unregister(&dss_bus_type);
 515                 return r;
 516         }
 517
 518         return 0;
 519 }
 520
 521 /* INIT */
 522
 523 #ifdef CONFIG_OMAP2_DSS_MODULE
 524 static void omap_dss_bus_unregister(void)
 525 {
 526         device_unregister(&dss_bus);
 527
 528         bus_unregister(&dss_bus_type);
 529 }
 530
 531 static int __init omap_dss_init(void)
 532 {
 533         int r;
 534
 535         r = omap_dss_bus_register();
 536         if (r)
 537                 return r;
 538
 539         r = platform_driver_register(&omap_dss_driver);
 540         if (r) {
 541                 omap_dss_bus_unregister();
 542                 return r;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static void __exit omap_dss_exit(void)
 549 {
 550         if (core.vdds_dsi_reg != NULL) {
 551                 regulator_put(core.vdds_dsi_reg);
 552                 core.vdds_dsi_reg = NULL;
 553         }
 554
 555         if (core.vdds_sdi_reg != NULL) {
 556                 regulator_put(core.vdds_sdi_reg);
 557                 core.vdds_sdi_reg = NULL;
 558         }
 559
 560         platform_driver_unregister(&omap_dss_driver);
 561
 562         omap_dss_bus_unregister();
 563 }
 564
 565 module_init(omap_dss_init);
 566 module_exit(omap_dss_exit);
 567 #else
 568 static int __init omap_dss_init(void)
 569 {
 570         return omap_dss_bus_register();
 571 }
 572
 573 static int __init omap_dss_init2(void)
 574 {
 575         return platform_driver_register(&omap_dss_driver);
 576 }
 577
 578 core_initcall(omap_dss_init);
 579 device_initcall(omap_dss_init2);
 580 #endif
 581
 582 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 583 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 584 MODULE_LICENSE("GPL v2");
 585