drivers/gpu/drm/tilcdc/tilcdc_drv.c

   1 /*
   2  * Copyright (C) 2012 Texas Instruments
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /* LCDC DRM driver, based on da8xx-fb */
  19
  20 #include "tilcdc_drv.h"
  21 #include "tilcdc_regs.h"
  22 #include "tilcdc_tfp410.h"
  23 #include "tilcdc_slave.h"
  24 #include "tilcdc_panel.h"
  25
  26 #include "drm_fb_helper.h"
  27
  28 static LIST_HEAD(module_list);
  29
  30 void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
  31                 const struct tilcdc_module_ops *funcs)
  32 {
  33         mod->name = name;
  34         mod->funcs = funcs;
  35         INIT_LIST_HEAD(&mod->list);
  36         list_add(&mod->list, &module_list);
  37 }
  38
  39 void tilcdc_module_cleanup(struct tilcdc_module *mod)
  40 {
  41         list_del(&mod->list);
  42 }
  43
  44 static struct of_device_id tilcdc_of_match[];
  45
  46 static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
  47                 struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
  48 {
  49         return drm_fb_cma_create(dev, file_priv, mode_cmd);
  50 }
  51
  52 static void tilcdc_fb_output_poll_changed(struct drm_device *dev)
  53 {
  54         struct tilcdc_drm_private *priv = dev->dev_private;
  55         if (priv->fbdev)
  56                 drm_fbdev_cma_hotplug_event(priv->fbdev);
  57 }
  58
  59 static const struct drm_mode_config_funcs mode_config_funcs = {
  60         .fb_create = tilcdc_fb_create,
  61         .output_poll_changed = tilcdc_fb_output_poll_changed,
  62 };
  63
  64 static int modeset_init(struct drm_device *dev)
  65 {
  66         struct tilcdc_drm_private *priv = dev->dev_private;
  67         struct tilcdc_module *mod;
  68
  69         drm_mode_config_init(dev);
  70
  71         priv->crtc = tilcdc_crtc_create(dev);
  72
  73         list_for_each_entry(mod, &module_list, list) {
  74                 DBG("loading module: %s", mod->name);
  75                 mod->funcs->modeset_init(mod, dev);
  76         }
  77
  78         if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
  79                 /* oh nos! */
  80                 dev_err(dev->dev, "no encoders/connectors found\n");
  81                 return -ENXIO;
  82         }
  83
  84         dev->mode_config.min_width = 0;
  85         dev->mode_config.min_height = 0;
  86         dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
  87         dev->mode_config.max_height = 2048;
  88         dev->mode_config.funcs = &mode_config_funcs;
  89
  90         return 0;
  91 }
  92
  93 #ifdef CONFIG_CPU_FREQ
  94 static int cpufreq_transition(struct notifier_block *nb,
  95                                      unsigned long val, void *data)
  96 {
  97         struct tilcdc_drm_private *priv = container_of(nb,
  98                         struct tilcdc_drm_private, freq_transition);
  99         if (val == CPUFREQ_POSTCHANGE) {
 100                 if (priv->lcd_fck_rate != clk_get_rate(priv->clk)) {
 101                         priv->lcd_fck_rate = clk_get_rate(priv->clk);
 102                         tilcdc_crtc_update_clk(priv->crtc);
 103                 }
 104         }
 105
 106         return 0;
 107 }
 108 #endif
 109
 110 /*
 111  * DRM operations:
 112  */
 113
 114 static int tilcdc_unload(struct drm_device *dev)
 115 {
 116         struct tilcdc_drm_private *priv = dev->dev_private;
 117         struct tilcdc_module *mod, *cur;
 118
 119         drm_kms_helper_poll_fini(dev);
 120         drm_mode_config_cleanup(dev);
 121         drm_vblank_cleanup(dev);
 122
 123         pm_runtime_get_sync(dev->dev);
 124         drm_irq_uninstall(dev);
 125         pm_runtime_put_sync(dev->dev);
 126
 127 #ifdef CONFIG_CPU_FREQ
 128         cpufreq_unregister_notifier(&priv->freq_transition,
 129                         CPUFREQ_TRANSITION_NOTIFIER);
 130 #endif
 131
 132         if (priv->clk)
 133                 clk_put(priv->clk);
 134
 135         if (priv->mmio)
 136                 iounmap(priv->mmio);
 137
 138         flush_workqueue(priv->wq);
 139         destroy_workqueue(priv->wq);
 140
 141         dev->dev_private = NULL;
 142
 143         pm_runtime_disable(dev->dev);
 144
 145         list_for_each_entry_safe(mod, cur, &module_list, list) {
 146                 DBG("destroying module: %s", mod->name);
 147                 mod->funcs->destroy(mod);
 148         }
 149
 150         kfree(priv);
 151
 152         return 0;
 153 }
 154
 155 static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 156 {
 157         struct platform_device *pdev = dev->platformdev;
 158         struct device_node *node = pdev->dev.of_node;
 159         struct tilcdc_drm_private *priv;
 160         struct resource *res;
 161         int ret;
 162
 163         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 164         if (!priv) {
 165                 dev_err(dev->dev, "failed to allocate private data\n");
 166                 return -ENOMEM;
 167         }
 168
 169         dev->dev_private = priv;
 170
 171         priv->wq = alloc_ordered_workqueue("tilcdc", 0);
 172
 173         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 174         if (!res) {
 175                 dev_err(dev->dev, "failed to get memory resource\n");
 176                 ret = -EINVAL;
 177                 goto fail;
 178         }
 179
 180         priv->mmio = ioremap_nocache(res->start, resource_size(res));
 181         if (!priv->mmio) {
 182                 dev_err(dev->dev, "failed to ioremap\n");
 183                 ret = -ENOMEM;
 184                 goto fail;
 185         }
 186
 187         priv->clk = clk_get(dev->dev, "fck");
 188         if (IS_ERR(priv->clk)) {
 189                 dev_err(dev->dev, "failed to get functional clock\n");
 190                 ret = -ENODEV;
 191                 goto fail;
 192         }
 193
 194         priv->disp_clk = clk_get(dev->dev, "dpll_disp_ck");
 195         if (IS_ERR(priv->clk)) {
 196                 dev_err(dev->dev, "failed to get display clock\n");
 197                 ret = -ENODEV;
 198                 goto fail;
 199         }
 200
 201 #ifdef CONFIG_CPU_FREQ
 202         priv->lcd_fck_rate = clk_get_rate(priv->clk);
 203         priv->freq_transition.notifier_call = cpufreq_transition;
 204         ret = cpufreq_register_notifier(&priv->freq_transition,
 205                         CPUFREQ_TRANSITION_NOTIFIER);
 206         if (ret) {
 207                 dev_err(dev->dev, "failed to register cpufreq notifier\n");
 208                 goto fail;
 209         }
 210 #endif
 211
 212         if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
 213                 priv->max_bandwidth = 1280 * 1024 * 60;
 214
 215         pm_runtime_enable(dev->dev);
 216
 217         /* Determine LCD IP Version */
 218         pm_runtime_get_sync(dev->dev);
 219         switch (tilcdc_read(dev, LCDC_PID_REG)) {
 220         case 0x4c100102:
 221                 priv->rev = 1;
 222                 break;
 223         case 0x4f200800:
 224         case 0x4f201000:
 225                 priv->rev = 2;
 226                 break;
 227         default:
 228                 dev_warn(dev->dev, "Unknown PID Reg value 0x%08x, "
 229                                 "defaulting to LCD revision 1\n",
 230                                 tilcdc_read(dev, LCDC_PID_REG));
 231                 priv->rev = 1;
 232                 break;
 233         }
 234
 235         pm_runtime_put_sync(dev->dev);
 236
 237         ret = modeset_init(dev);
 238         if (ret < 0) {
 239                 dev_err(dev->dev, "failed to initialize mode setting\n");
 240                 goto fail;
 241         }
 242
 243         ret = drm_vblank_init(dev, 1);
 244         if (ret < 0) {
 245                 dev_err(dev->dev, "failed to initialize vblank\n");
 246                 goto fail;
 247         }
 248
 249         pm_runtime_get_sync(dev->dev);
 250         ret = drm_irq_install(dev);
 251         pm_runtime_put_sync(dev->dev);
 252         if (ret < 0) {
 253                 dev_err(dev->dev, "failed to install IRQ handler\n");
 254                 goto fail;
 255         }
 256
 257         platform_set_drvdata(pdev, dev);
 258
 259         priv->fbdev = drm_fbdev_cma_init(dev, 16,
 260                         dev->mode_config.num_crtc,
 261                         dev->mode_config.num_connector);
 262
 263         drm_kms_helper_poll_init(dev);
 264
 265         return 0;
 266
 267 fail:
 268         tilcdc_unload(dev);
 269         return ret;
 270 }
 271
 272 static void tilcdc_preclose(struct drm_device *dev, struct drm_file *file)
 273 {
 274         struct tilcdc_drm_private *priv = dev->dev_private;
 275
 276         tilcdc_crtc_cancel_page_flip(priv->crtc, file);
 277 }
 278
 279 static void tilcdc_lastclose(struct drm_device *dev)
 280 {
 281         struct tilcdc_drm_private *priv = dev->dev_private;
 282         drm_fbdev_cma_restore_mode(priv->fbdev);
 283 }
 284
 285 static irqreturn_t tilcdc_irq(DRM_IRQ_ARGS)
 286 {
 287         struct drm_device *dev = arg;
 288         struct tilcdc_drm_private *priv = dev->dev_private;
 289         return tilcdc_crtc_irq(priv->crtc);
 290 }
 291
 292 static void tilcdc_irq_preinstall(struct drm_device *dev)
 293 {
 294         tilcdc_clear_irqstatus(dev, 0xffffffff);
 295 }
 296
 297 static int tilcdc_irq_postinstall(struct drm_device *dev)
 298 {
 299         struct tilcdc_drm_private *priv = dev->dev_private;
 300
 301         /* enable FIFO underflow irq: */
 302         if (priv->rev == 1)
 303                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_UNDERFLOW_INT_ENA);
 304         else
 305                 tilcdc_set(dev, LCDC_INT_ENABLE_SET_REG, LCDC_V2_UNDERFLOW_INT_ENA);
 306
 307         return 0;
 308 }
 309
 310 static void tilcdc_irq_uninstall(struct drm_device *dev)
 311 {
 312         struct tilcdc_drm_private *priv = dev->dev_private;
 313
 314         /* disable irqs that we might have enabled: */
 315         if (priv->rev == 1) {
 316                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 317                                 LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
 318                 tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_V1_END_OF_FRAME_INT_ENA);
 319         } else {
 320                 tilcdc_clear(dev, LCDC_INT_ENABLE_SET_REG,
 321                         LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
 322                         LCDC_V2_END_OF_FRAME0_INT_ENA | LCDC_V2_END_OF_FRAME1_INT_ENA |
 323                         LCDC_FRAME_DONE);
 324         }
 325
 326 }
 327
 328 static void enable_vblank(struct drm_device *dev, bool enable)
 329 {
 330         struct tilcdc_drm_private *priv = dev->dev_private;
 331         u32 reg, mask;
 332
 333         if (priv->rev == 1) {
 334                 reg = LCDC_DMA_CTRL_REG;
 335                 mask = LCDC_V1_END_OF_FRAME_INT_ENA;
 336         } else {
 337                 reg = LCDC_INT_ENABLE_SET_REG;
 338                 mask = LCDC_V2_END_OF_FRAME0_INT_ENA |
 339                         LCDC_V2_END_OF_FRAME1_INT_ENA | LCDC_FRAME_DONE;
 340         }
 341
 342         if (enable)
 343                 tilcdc_set(dev, reg, mask);
 344         else
 345                 tilcdc_clear(dev, reg, mask);
 346 }
 347
 348 static int tilcdc_enable_vblank(struct drm_device *dev, int crtc)
 349 {
 350         enable_vblank(dev, true);
 351         return 0;
 352 }
 353
 354 static void tilcdc_disable_vblank(struct drm_device *dev, int crtc)
 355 {
 356         enable_vblank(dev, false);
 357 }
 358
 359 #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_PM_SLEEP)
 360 static const struct {
 361         const char *name;
 362         uint8_t  rev;
 363         uint8_t  save;
 364         uint32_t reg;
 365 } registers[] =         {
 366 #define REG(rev, save, reg) { #reg, rev, save, reg }
 367                 /* exists in revision 1: */
 368                 REG(1, false, LCDC_PID_REG),
 369                 REG(1, true,  LCDC_CTRL_REG),
 370                 REG(1, false, LCDC_STAT_REG),
 371                 REG(1, true,  LCDC_RASTER_CTRL_REG),
 372                 REG(1, true,  LCDC_RASTER_TIMING_0_REG),
 373                 REG(1, true,  LCDC_RASTER_TIMING_1_REG),
 374                 REG(1, true,  LCDC_RASTER_TIMING_2_REG),
 375                 REG(1, true,  LCDC_DMA_CTRL_REG),
 376                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_0_REG),
 377                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_0_REG),
 378                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_1_REG),
 379                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_1_REG),
 380                 /* new in revision 2: */
 381                 REG(2, false, LCDC_RAW_STAT_REG),
 382                 REG(2, false, LCDC_MASKED_STAT_REG),
 383                 REG(2, false, LCDC_INT_ENABLE_SET_REG),
 384                 REG(2, false, LCDC_INT_ENABLE_CLR_REG),
 385                 REG(2, false, LCDC_END_OF_INT_IND_REG),
 386                 REG(2, true,  LCDC_CLK_ENABLE_REG),
 387                 REG(2, true,  LCDC_INT_ENABLE_SET_REG),
 388 #undef REG
 389 };
 390 #endif
 391
 392 #ifdef CONFIG_DEBUG_FS
 393 static int tilcdc_regs_show(struct seq_file *m, void *arg)
 394 {
 395         struct drm_info_node *node = (struct drm_info_node *) m->private;
 396         struct drm_device *dev = node->minor->dev;
 397         struct tilcdc_drm_private *priv = dev->dev_private;
 398         unsigned i;
 399
 400         pm_runtime_get_sync(dev->dev);
 401
 402         seq_printf(m, "revision: %d\n", priv->rev);
 403
 404         for (i = 0; i < ARRAY_SIZE(registers); i++)
 405                 if (priv->rev >= registers[i].rev)
 406                         seq_printf(m, "%s:\t %08x\n", registers[i].name,
 407                                         tilcdc_read(dev, registers[i].reg));
 408
 409         pm_runtime_put_sync(dev->dev);
 410
 411         return 0;
 412 }
 413
 414 static int tilcdc_mm_show(struct seq_file *m, void *arg)
 415 {
 416         struct drm_info_node *node = (struct drm_info_node *) m->private;
 417         struct drm_device *dev = node->minor->dev;
 418         return drm_mm_dump_table(m, dev->mm_private);
 419 }
 420
 421 static struct drm_info_list tilcdc_debugfs_list[] = {
 422                 { "regs", tilcdc_regs_show, 0 },
 423                 { "mm",   tilcdc_mm_show,   0 },
 424                 { "fb",   drm_fb_cma_debugfs_show, 0 },
 425 };
 426
 427 static int tilcdc_debugfs_init(struct drm_minor *minor)
 428 {
 429         struct drm_device *dev = minor->dev;
 430         struct tilcdc_module *mod;
 431         int ret;
 432
 433         ret = drm_debugfs_create_files(tilcdc_debugfs_list,
 434                         ARRAY_SIZE(tilcdc_debugfs_list),
 435                         minor->debugfs_root, minor);
 436
 437         list_for_each_entry(mod, &module_list, list)
 438                 if (mod->funcs->debugfs_init)
 439                         mod->funcs->debugfs_init(mod, minor);
 440
 441         if (ret) {
 442                 dev_err(dev->dev, "could not install tilcdc_debugfs_list\n");
 443                 return ret;
 444         }
 445
 446         return ret;
 447 }
 448
 449 static void tilcdc_debugfs_cleanup(struct drm_minor *minor)
 450 {
 451         struct tilcdc_module *mod;
 452         drm_debugfs_remove_files(tilcdc_debugfs_list,
 453                         ARRAY_SIZE(tilcdc_debugfs_list), minor);
 454
 455         list_for_each_entry(mod, &module_list, list)
 456                 if (mod->funcs->debugfs_cleanup)
 457                         mod->funcs->debugfs_cleanup(mod, minor);
 458 }
 459 #endif
 460
 461 static const struct file_operations fops = {
 462         .owner              = THIS_MODULE,
 463         .open               = drm_open,
 464         .release            = drm_release,
 465         .unlocked_ioctl     = drm_ioctl,
 466 #ifdef CONFIG_COMPAT
 467         .compat_ioctl       = drm_compat_ioctl,
 468 #endif
 469         .poll               = drm_poll,
 470         .read               = drm_read,
 471         .fasync             = drm_fasync,
 472         .llseek             = no_llseek,
 473         .mmap               = drm_gem_cma_mmap,
 474 };
 475
 476 static struct drm_driver tilcdc_driver = {
 477         .driver_features    = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET,
 478         .load               = tilcdc_load,
 479         .unload             = tilcdc_unload,
 480         .preclose           = tilcdc_preclose,
 481         .lastclose          = tilcdc_lastclose,
 482         .irq_handler        = tilcdc_irq,
 483         .irq_preinstall     = tilcdc_irq_preinstall,
 484         .irq_postinstall    = tilcdc_irq_postinstall,
 485         .irq_uninstall      = tilcdc_irq_uninstall,
 486         .get_vblank_counter = drm_vblank_count,
 487         .enable_vblank      = tilcdc_enable_vblank,
 488         .disable_vblank     = tilcdc_disable_vblank,
 489         .gem_free_object    = drm_gem_cma_free_object,
 490         .gem_vm_ops         = &drm_gem_cma_vm_ops,
 491         .dumb_create        = drm_gem_cma_dumb_create,
 492         .dumb_map_offset    = drm_gem_cma_dumb_map_offset,
 493         .dumb_destroy       = drm_gem_cma_dumb_destroy,
 494 #ifdef CONFIG_DEBUG_FS
 495         .debugfs_init       = tilcdc_debugfs_init,
 496         .debugfs_cleanup    = tilcdc_debugfs_cleanup,
 497 #endif
 498         .fops               = &fops,
 499         .name               = "tilcdc",
 500         .desc               = "TI LCD Controller DRM",
 501         .date               = "20121205",
 502         .major              = 1,
 503         .minor              = 0,
 504 };
 505
 506 /*
 507  * Power management:
 508  */
 509
 510 #ifdef CONFIG_PM_SLEEP
 511 static int tilcdc_pm_suspend(struct device *dev)
 512 {
 513         struct drm_device *ddev = dev_get_drvdata(dev);
 514         struct tilcdc_drm_private *priv = ddev->dev_private;
 515         unsigned i, n = 0;
 516
 517         drm_kms_helper_poll_disable(ddev);
 518
 519         /* Save register state: */
 520         for (i = 0; i < ARRAY_SIZE(registers); i++)
 521                 if (registers[i].save && (priv->rev >= registers[i].rev))
 522                         priv->saved_register[n++] = tilcdc_read(ddev, registers[i].reg);
 523
 524         return 0;
 525 }
 526
 527 static int tilcdc_pm_resume(struct device *dev)
 528 {
 529         struct drm_device *ddev = dev_get_drvdata(dev);
 530         struct tilcdc_drm_private *priv = ddev->dev_private;
 531         unsigned i, n = 0;
 532
 533         /* Restore register state: */
 534         for (i = 0; i < ARRAY_SIZE(registers); i++)
 535                 if (registers[i].save && (priv->rev >= registers[i].rev))
 536                         tilcdc_write(ddev, registers[i].reg, priv->saved_register[n++]);
 537
 538         drm_kms_helper_poll_enable(ddev);
 539
 540         return 0;
 541 }
 542 #endif
 543
 544 static const struct dev_pm_ops tilcdc_pm_ops = {
 545         SET_SYSTEM_SLEEP_PM_OPS(tilcdc_pm_suspend, tilcdc_pm_resume)
 546 };
 547
 548 /*
 549  * Platform driver:
 550  */
 551
 552 static int tilcdc_pdev_probe(struct platform_device *pdev)
 553 {
 554         /* bail out early if no DT data: */
 555         if (!pdev->dev.of_node) {
 556                 dev_err(&pdev->dev, "device-tree data is missing\n");
 557                 return -ENXIO;
 558         }
 559
 560         return drm_platform_init(&tilcdc_driver, pdev);
 561 }
 562
 563 static int tilcdc_pdev_remove(struct platform_device *pdev)
 564 {
 565         drm_platform_exit(&tilcdc_driver, pdev);
 566
 567         return 0;
 568 }
 569
 570 static struct of_device_id tilcdc_of_match[] = {
 571                 { .compatible = "ti,am33xx-tilcdc", },
 572                 { },
 573 };
 574 MODULE_DEVICE_TABLE(of, tilcdc_of_match);
 575
 576 static struct platform_driver tilcdc_platform_driver = {
 577         .probe      = tilcdc_pdev_probe,
 578         .remove     = tilcdc_pdev_remove,
 579         .driver     = {
 580                 .owner  = THIS_MODULE,
 581                 .name   = "tilcdc",
 582                 .pm     = &tilcdc_pm_ops,
 583                 .of_match_table = tilcdc_of_match,
 584         },
 585 };
 586
 587 static int __init tilcdc_drm_init(void)
 588 {
 589         DBG("init");
 590         tilcdc_tfp410_init();
 591         tilcdc_slave_init();
 592         tilcdc_panel_init();
 593         return platform_driver_register(&tilcdc_platform_driver);
 594 }
 595
 596 static void __exit tilcdc_drm_fini(void)
 597 {
 598         DBG("fini");
 599         tilcdc_tfp410_fini();
 600         tilcdc_slave_fini();
 601         tilcdc_panel_fini();
 602         platform_driver_unregister(&tilcdc_platform_driver);
 603 }
 604
 605 late_initcall(tilcdc_drm_init);
 606 module_exit(tilcdc_drm_fini);
 607
 608 MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
 609 MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
 610 MODULE_LICENSE("GPL");