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