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