drivers/video/exynos/exynos_mipi_dsi.c

   1 /* linux/drivers/video/exynos/exynos_mipi_dsi.c
   2  *
   3  * Samsung SoC MIPI-DSIM driver.
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd
   6  *
   7  * InKi Dae, <inki.dae@samsung.com>
   8  * Donghwa Lee, <dh09.lee@samsung.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13 */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/clk.h>
  19 #include <linux/mutex.h>
  20 #include <linux/wait.h>
  21 #include <linux/fs.h>
  22 #include <linux/mm.h>
  23 #include <linux/fb.h>
  24 #include <linux/ctype.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/io.h>
  27 #include <linux/irq.h>
  28 #include <linux/memory.h>
  29 #include <linux/delay.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/kthread.h>
  32 #include <linux/notifier.h>
  33 #include <linux/regulator/consumer.h>
  34 #include <linux/pm_runtime.h>
  35
  36 #include <video/exynos_mipi_dsim.h>
  37
  38 #include <plat/fb.h>
  39
  40 #include "exynos_mipi_dsi_common.h"
  41 #include "exynos_mipi_dsi_lowlevel.h"
  42
  43 struct mipi_dsim_ddi {
  44         int                             bus_id;
  45         struct list_head                list;
  46         struct mipi_dsim_lcd_device     *dsim_lcd_dev;
  47         struct mipi_dsim_lcd_driver     *dsim_lcd_drv;
  48 };
  49
  50 static LIST_HEAD(dsim_ddi_list);
  51
  52 static DEFINE_MUTEX(mipi_dsim_lock);
  53
  54 static struct mipi_dsim_platform_data *to_dsim_plat(struct platform_device
  55                                                         *pdev)
  56 {
  57         return pdev->dev.platform_data;
  58 }
  59
  60 static struct regulator_bulk_data supplies[] = {
  61         { .supply = "vdd11", },
  62         { .supply = "vdd18", },
  63 };
  64
  65 static int exynos_mipi_regulator_enable(struct mipi_dsim_device *dsim)
  66 {
  67         int ret;
  68
  69         mutex_lock(&dsim->lock);
  70         ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);
  71         mutex_unlock(&dsim->lock);
  72
  73         return ret;
  74 }
  75
  76 static int exynos_mipi_regulator_disable(struct mipi_dsim_device *dsim)
  77 {
  78         int ret;
  79
  80         mutex_lock(&dsim->lock);
  81         ret = regulator_bulk_disable(ARRAY_SIZE(supplies), supplies);
  82         mutex_unlock(&dsim->lock);
  83
  84         return ret;
  85 }
  86
  87 /* update all register settings to MIPI DSI controller. */
  88 static void exynos_mipi_update_cfg(struct mipi_dsim_device *dsim)
  89 {
  90         /*
  91          * data from Display controller(FIMD) is not transferred in video mode
  92          * but in case of command mode, all settings is not updated to
  93          * registers.
  94          */
  95         exynos_mipi_dsi_stand_by(dsim, 0);
  96
  97         exynos_mipi_dsi_init_dsim(dsim);
  98         exynos_mipi_dsi_init_link(dsim);
  99
 100         exynos_mipi_dsi_set_hs_enable(dsim);
 101
 102         /* set display timing. */
 103         exynos_mipi_dsi_set_display_mode(dsim, dsim->dsim_config);
 104
 105         exynos_mipi_dsi_init_interrupt(dsim);
 106
 107         /*
 108          * data from Display controller(FIMD) is transferred in video mode
 109          * but in case of command mode, all settings are updated to registers.
 110          */
 111         exynos_mipi_dsi_stand_by(dsim, 1);
 112 }
 113
 114 static int exynos_mipi_dsi_early_blank_mode(struct mipi_dsim_device *dsim,
 115                 int power)
 116 {
 117         struct mipi_dsim_lcd_driver *client_drv = dsim->dsim_lcd_drv;
 118         struct mipi_dsim_lcd_device *client_dev = dsim->dsim_lcd_dev;
 119
 120         switch (power) {
 121         case FB_BLANK_POWERDOWN:
 122                 if (dsim->suspended)
 123                         return 0;
 124
 125                 if (client_drv && client_drv->suspend)
 126                         client_drv->suspend(client_dev);
 127
 128                 clk_disable(dsim->clock);
 129
 130                 exynos_mipi_regulator_disable(dsim);
 131
 132                 dsim->suspended = true;
 133
 134                 break;
 135         default:
 136                 break;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int exynos_mipi_dsi_blank_mode(struct mipi_dsim_device *dsim, int power)
 143 {
 144         struct platform_device *pdev = to_platform_device(dsim->dev);
 145         struct mipi_dsim_lcd_driver *client_drv = dsim->dsim_lcd_drv;
 146         struct mipi_dsim_lcd_device *client_dev = dsim->dsim_lcd_dev;
 147
 148         switch (power) {
 149         case FB_BLANK_UNBLANK:
 150                 if (!dsim->suspended)
 151                         return 0;
 152
 153                 /* lcd panel power on. */
 154                 if (client_drv && client_drv->power_on)
 155                         client_drv->power_on(client_dev, 1);
 156
 157                 exynos_mipi_regulator_enable(dsim);
 158
 159                 /* enable MIPI-DSI PHY. */
 160                 if (dsim->pd->phy_enable)
 161                         dsim->pd->phy_enable(pdev, true);
 162
 163                 clk_enable(dsim->clock);
 164
 165                 exynos_mipi_update_cfg(dsim);
 166
 167                 /* set lcd panel sequence commands. */
 168                 if (client_drv && client_drv->set_sequence)
 169                         client_drv->set_sequence(client_dev);
 170
 171                 dsim->suspended = false;
 172
 173                 break;
 174         case FB_BLANK_NORMAL:
 175                 /* TODO. */
 176                 break;
 177         default:
 178                 break;
 179         }
 180
 181         return 0;
 182 }
 183
 184 int exynos_mipi_dsi_register_lcd_device(struct mipi_dsim_lcd_device *lcd_dev)
 185 {
 186         struct mipi_dsim_ddi *dsim_ddi;
 187
 188         if (!lcd_dev->name) {
 189                 pr_err("dsim_lcd_device name is NULL.\n");
 190                 return -EFAULT;
 191         }
 192
 193         dsim_ddi = kzalloc(sizeof(struct mipi_dsim_ddi), GFP_KERNEL);
 194         if (!dsim_ddi) {
 195                 pr_err("failed to allocate dsim_ddi object.\n");
 196                 return -ENOMEM;
 197         }
 198
 199         dsim_ddi->dsim_lcd_dev = lcd_dev;
 200
 201         mutex_lock(&mipi_dsim_lock);
 202         list_add_tail(&dsim_ddi->list, &dsim_ddi_list);
 203         mutex_unlock(&mipi_dsim_lock);
 204
 205         return 0;
 206 }
 207
 208 struct mipi_dsim_ddi *exynos_mipi_dsi_find_lcd_device(struct mipi_dsim_lcd_driver *lcd_drv)
 209 {
 210         struct mipi_dsim_ddi *dsim_ddi, *next;
 211         struct mipi_dsim_lcd_device *lcd_dev;
 212
 213         mutex_lock(&mipi_dsim_lock);
 214
 215         list_for_each_entry_safe(dsim_ddi, next, &dsim_ddi_list, list) {
 216                 if (!dsim_ddi)
 217                         goto out;
 218
 219                 lcd_dev = dsim_ddi->dsim_lcd_dev;
 220                 if (!lcd_dev)
 221                         continue;
 222
 223                 if ((strcmp(lcd_drv->name, lcd_dev->name)) == 0) {
 224                         /**
 225                          * bus_id would be used to identify
 226                          * connected bus.
 227                          */
 228                         dsim_ddi->bus_id = lcd_dev->bus_id;
 229                         mutex_unlock(&mipi_dsim_lock);
 230
 231                         return dsim_ddi;
 232                 }
 233
 234                 list_del(&dsim_ddi->list);
 235                 kfree(dsim_ddi);
 236         }
 237
 238 out:
 239         mutex_unlock(&mipi_dsim_lock);
 240
 241         return NULL;
 242 }
 243
 244 int exynos_mipi_dsi_register_lcd_driver(struct mipi_dsim_lcd_driver *lcd_drv)
 245 {
 246         struct mipi_dsim_ddi *dsim_ddi;
 247
 248         if (!lcd_drv->name) {
 249                 pr_err("dsim_lcd_driver name is NULL.\n");
 250                 return -EFAULT;
 251         }
 252
 253         dsim_ddi = exynos_mipi_dsi_find_lcd_device(lcd_drv);
 254         if (!dsim_ddi) {
 255                 pr_err("mipi_dsim_ddi object not found.\n");
 256                 return -EFAULT;
 257         }
 258
 259         dsim_ddi->dsim_lcd_drv = lcd_drv;
 260
 261         pr_info("registered panel driver(%s) to mipi-dsi driver.\n",
 262                 lcd_drv->name);
 263
 264         return 0;
 265
 266 }
 267
 268 struct mipi_dsim_ddi *exynos_mipi_dsi_bind_lcd_ddi(struct mipi_dsim_device *dsim,
 269                                                 const char *name)
 270 {
 271         struct mipi_dsim_ddi *dsim_ddi, *next;
 272         struct mipi_dsim_lcd_driver *lcd_drv;
 273         struct mipi_dsim_lcd_device *lcd_dev;
 274         int ret;
 275
 276         mutex_lock(&dsim->lock);
 277
 278         list_for_each_entry_safe(dsim_ddi, next, &dsim_ddi_list, list) {
 279                 lcd_drv = dsim_ddi->dsim_lcd_drv;
 280                 lcd_dev = dsim_ddi->dsim_lcd_dev;
 281                 if (!lcd_drv || !lcd_dev ||
 282                         (dsim->id != dsim_ddi->bus_id))
 283                                 continue;
 284
 285                 dev_dbg(dsim->dev, "lcd_drv->id = %d, lcd_dev->id = %d\n",
 286                                 lcd_drv->id, lcd_dev->id);
 287                 dev_dbg(dsim->dev, "lcd_dev->bus_id = %d, dsim->id = %d\n",
 288                                 lcd_dev->bus_id, dsim->id);
 289
 290                 if ((strcmp(lcd_drv->name, name) == 0)) {
 291                         lcd_dev->master = dsim;
 292
 293                         lcd_dev->dev.parent = dsim->dev;
 294                         dev_set_name(&lcd_dev->dev, "%s", lcd_drv->name);
 295
 296                         ret = device_register(&lcd_dev->dev);
 297                         if (ret < 0) {
 298                                 dev_err(dsim->dev,
 299                                         "can't register %s, status %d\n",
 300                                         dev_name(&lcd_dev->dev), ret);
 301                                 mutex_unlock(&dsim->lock);
 302
 303                                 return NULL;
 304                         }
 305
 306                         dsim->dsim_lcd_dev = lcd_dev;
 307                         dsim->dsim_lcd_drv = lcd_drv;
 308
 309                         mutex_unlock(&dsim->lock);
 310
 311                         return dsim_ddi;
 312                 }
 313         }
 314
 315         mutex_unlock(&dsim->lock);
 316
 317         return NULL;
 318 }
 319
 320 /* define MIPI-DSI Master operations. */
 321 static struct mipi_dsim_master_ops master_ops = {
 322         .cmd_read                       = exynos_mipi_dsi_rd_data,
 323         .cmd_write                      = exynos_mipi_dsi_wr_data,
 324         .get_dsim_frame_done            = exynos_mipi_dsi_get_frame_done_status,
 325         .clear_dsim_frame_done          = exynos_mipi_dsi_clear_frame_done,
 326         .set_early_blank_mode           = exynos_mipi_dsi_early_blank_mode,
 327         .set_blank_mode                 = exynos_mipi_dsi_blank_mode,
 328 };
 329
 330 static int exynos_mipi_dsi_probe(struct platform_device *pdev)
 331 {
 332         struct resource *res;
 333         struct mipi_dsim_device *dsim;
 334         struct mipi_dsim_config *dsim_config;
 335         struct mipi_dsim_platform_data *dsim_pd;
 336         struct mipi_dsim_ddi *dsim_ddi;
 337         int ret = -EINVAL;
 338
 339         dsim = kzalloc(sizeof(struct mipi_dsim_device), GFP_KERNEL);
 340         if (!dsim) {
 341                 dev_err(&pdev->dev, "failed to allocate dsim object.\n");
 342                 return -ENOMEM;
 343         }
 344
 345         dsim->pd = to_dsim_plat(pdev);
 346         dsim->dev = &pdev->dev;
 347         dsim->id = pdev->id;
 348
 349         /* get mipi_dsim_platform_data. */
 350         dsim_pd = (struct mipi_dsim_platform_data *)dsim->pd;
 351         if (dsim_pd == NULL) {
 352                 dev_err(&pdev->dev, "failed to get platform data for dsim.\n");
 353                 goto err_clock_get;
 354         }
 355         /* get mipi_dsim_config. */
 356         dsim_config = dsim_pd->dsim_config;
 357         if (dsim_config == NULL) {
 358                 dev_err(&pdev->dev, "failed to get dsim config data.\n");
 359                 goto err_clock_get;
 360         }
 361
 362         dsim->dsim_config = dsim_config;
 363         dsim->master_ops = &master_ops;
 364
 365         mutex_init(&dsim->lock);
 366
 367         ret = regulator_bulk_get(&pdev->dev, ARRAY_SIZE(supplies), supplies);
 368         if (ret) {
 369                 dev_err(&pdev->dev, "Failed to get regulators: %d\n", ret);
 370                 goto err_clock_get;
 371         }
 372
 373         dsim->clock = clk_get(&pdev->dev, "dsim0");
 374         if (IS_ERR(dsim->clock)) {
 375                 dev_err(&pdev->dev, "failed to get dsim clock source\n");
 376                 goto err_clock_get;
 377         }
 378
 379         clk_enable(dsim->clock);
 380
 381         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 382         if (!res) {
 383                 dev_err(&pdev->dev, "failed to get io memory region\n");
 384                 goto err_platform_get;
 385         }
 386
 387         dsim->res = request_mem_region(res->start, resource_size(res),
 388                                         dev_name(&pdev->dev));
 389         if (!dsim->res) {
 390                 dev_err(&pdev->dev, "failed to request io memory region\n");
 391                 ret = -ENOMEM;
 392                 goto err_mem_region;
 393         }
 394
 395         dsim->reg_base = ioremap(res->start, resource_size(res));
 396         if (!dsim->reg_base) {
 397                 dev_err(&pdev->dev, "failed to remap io region\n");
 398                 ret = -ENOMEM;
 399                 goto err_ioremap;
 400         }
 401
 402         mutex_init(&dsim->lock);
 403
 404         /* bind lcd ddi matched with panel name. */
 405         dsim_ddi = exynos_mipi_dsi_bind_lcd_ddi(dsim, dsim_pd->lcd_panel_name);
 406         if (!dsim_ddi) {
 407                 dev_err(&pdev->dev, "mipi_dsim_ddi object not found.\n");
 408                 goto err_bind;
 409         }
 410
 411         dsim->irq = platform_get_irq(pdev, 0);
 412         if (dsim->irq < 0) {
 413                 dev_err(&pdev->dev, "failed to request dsim irq resource\n");
 414                 ret = -EINVAL;
 415                 goto err_platform_get_irq;
 416         }
 417
 418         init_completion(&dsim_wr_comp);
 419         init_completion(&dsim_rd_comp);
 420         platform_set_drvdata(pdev, dsim);
 421
 422         ret = request_irq(dsim->irq, exynos_mipi_dsi_interrupt_handler,
 423                         IRQF_SHARED, dev_name(&pdev->dev), dsim);
 424         if (ret != 0) {
 425                 dev_err(&pdev->dev, "failed to request dsim irq\n");
 426                 ret = -EINVAL;
 427                 goto err_bind;
 428         }
 429
 430         /* enable interrupts */
 431         exynos_mipi_dsi_init_interrupt(dsim);
 432
 433         /* initialize mipi-dsi client(lcd panel). */
 434         if (dsim_ddi->dsim_lcd_drv && dsim_ddi->dsim_lcd_drv->probe)
 435                 dsim_ddi->dsim_lcd_drv->probe(dsim_ddi->dsim_lcd_dev);
 436
 437         /* in case mipi-dsi has been enabled by bootloader */
 438         if (dsim_pd->enabled) {
 439                 exynos_mipi_regulator_enable(dsim);
 440                 goto done;
 441         }
 442
 443         /* lcd panel power on. */
 444         if (dsim_ddi->dsim_lcd_drv && dsim_ddi->dsim_lcd_drv->power_on)
 445                 dsim_ddi->dsim_lcd_drv->power_on(dsim_ddi->dsim_lcd_dev, 1);
 446
 447         exynos_mipi_regulator_enable(dsim);
 448
 449         /* enable MIPI-DSI PHY. */
 450         if (dsim->pd->phy_enable)
 451                 dsim->pd->phy_enable(pdev, true);
 452
 453         exynos_mipi_update_cfg(dsim);
 454
 455         /* set lcd panel sequence commands. */
 456         if (dsim_ddi->dsim_lcd_drv && dsim_ddi->dsim_lcd_drv->set_sequence)
 457                 dsim_ddi->dsim_lcd_drv->set_sequence(dsim_ddi->dsim_lcd_dev);
 458
 459         dsim->suspended = false;
 460
 461 done:
 462         platform_set_drvdata(pdev, dsim);
 463
 464         dev_dbg(&pdev->dev, "%s() completed sucessfuly (%s mode)\n", __func__,
 465                 dsim_config->e_interface == DSIM_COMMAND ? "CPU" : "RGB");
 466
 467         return 0;
 468
 469 err_bind:
 470         iounmap(dsim->reg_base);
 471
 472 err_ioremap:
 473         release_mem_region(dsim->res->start, resource_size(dsim->res));
 474
 475 err_mem_region:
 476         release_resource(dsim->res);
 477
 478 err_platform_get:
 479         clk_disable(dsim->clock);
 480         clk_put(dsim->clock);
 481 err_clock_get:
 482         kfree(dsim);
 483
 484 err_platform_get_irq:
 485         return ret;
 486 }
 487
 488 static int __devexit exynos_mipi_dsi_remove(struct platform_device *pdev)
 489 {
 490         struct mipi_dsim_device *dsim = platform_get_drvdata(pdev);
 491         struct mipi_dsim_ddi *dsim_ddi, *next;
 492         struct mipi_dsim_lcd_driver *dsim_lcd_drv;
 493
 494         iounmap(dsim->reg_base);
 495
 496         clk_disable(dsim->clock);
 497         clk_put(dsim->clock);
 498
 499         release_resource(dsim->res);
 500         release_mem_region(dsim->res->start, resource_size(dsim->res));
 501
 502         list_for_each_entry_safe(dsim_ddi, next, &dsim_ddi_list, list) {
 503                 if (dsim_ddi) {
 504                         if (dsim->id != dsim_ddi->bus_id)
 505                                 continue;
 506
 507                         dsim_lcd_drv = dsim_ddi->dsim_lcd_drv;
 508
 509                         if (dsim_lcd_drv->remove)
 510                                 dsim_lcd_drv->remove(dsim_ddi->dsim_lcd_dev);
 511
 512                         kfree(dsim_ddi);
 513                 }
 514         }
 515
 516         regulator_bulk_free(ARRAY_SIZE(supplies), supplies);
 517         kfree(dsim);
 518
 519         return 0;
 520 }
 521
 522 #ifdef CONFIG_PM_SLEEP
 523 static int exynos_mipi_dsi_suspend(struct device *dev)
 524 {
 525         struct platform_device *pdev = to_platform_device(dev);
 526         struct mipi_dsim_device *dsim = platform_get_drvdata(pdev);
 527         struct mipi_dsim_lcd_driver *client_drv = dsim->dsim_lcd_drv;
 528         struct mipi_dsim_lcd_device *client_dev = dsim->dsim_lcd_dev;
 529
 530         disable_irq(dsim->irq);
 531
 532         if (dsim->suspended)
 533                 return 0;
 534
 535         if (client_drv && client_drv->suspend)
 536                 client_drv->suspend(client_dev);
 537
 538         /* enable MIPI-DSI PHY. */
 539         if (dsim->pd->phy_enable)
 540                 dsim->pd->phy_enable(pdev, false);
 541
 542         clk_disable(dsim->clock);
 543
 544         exynos_mipi_regulator_disable(dsim);
 545
 546         dsim->suspended = true;
 547
 548         return 0;
 549 }
 550
 551 static int exynos_mipi_dsi_resume(struct device *dev)
 552 {
 553         struct platform_device *pdev = to_platform_device(dev);
 554         struct mipi_dsim_device *dsim = platform_get_drvdata(pdev);
 555         struct mipi_dsim_lcd_driver *client_drv = dsim->dsim_lcd_drv;
 556         struct mipi_dsim_lcd_device *client_dev = dsim->dsim_lcd_dev;
 557
 558         enable_irq(dsim->irq);
 559
 560         if (!dsim->suspended)
 561                 return 0;
 562
 563         /* lcd panel power on. */
 564         if (client_drv && client_drv->power_on)
 565                 client_drv->power_on(client_dev, 1);
 566
 567         exynos_mipi_regulator_enable(dsim);
 568
 569         /* enable MIPI-DSI PHY. */
 570         if (dsim->pd->phy_enable)
 571                 dsim->pd->phy_enable(pdev, true);
 572
 573         clk_enable(dsim->clock);
 574
 575         exynos_mipi_update_cfg(dsim);
 576
 577         /* set lcd panel sequence commands. */
 578         if (client_drv && client_drv->set_sequence)
 579                 client_drv->set_sequence(client_dev);
 580
 581         dsim->suspended = false;
 582
 583         return 0;
 584 }
 585 #endif
 586
 587 static const struct dev_pm_ops exynos_mipi_dsi_pm_ops = {
 588         SET_SYSTEM_SLEEP_PM_OPS(exynos_mipi_dsi_suspend, exynos_mipi_dsi_resume)
 589 };
 590
 591 static struct platform_driver exynos_mipi_dsi_driver = {
 592         .probe = exynos_mipi_dsi_probe,
 593         .remove = __devexit_p(exynos_mipi_dsi_remove),
 594         .driver = {
 595                    .name = "exynos-mipi-dsim",
 596                    .owner = THIS_MODULE,
 597                    .pm = &exynos_mipi_dsi_pm_ops,
 598         },
 599 };
 600
 601 module_platform_driver(exynos_mipi_dsi_driver);
 602
 603 MODULE_AUTHOR("InKi Dae <inki.dae@samsung.com>");
 604 MODULE_DESCRIPTION("Samusung SoC MIPI-DSI driver");
 605 MODULE_LICENSE("GPL");