drivers/gpu/drm/rockchip/rockchip_drm_drv.c

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author:Mark Yao <mark.yao@rock-chips.com>
   4  *
   5  * based on exynos_drm_drv.c
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <asm/dma-iommu.h>
  18
  19 #include <drm/drmP.h>
  20 #include <drm/drm_crtc_helper.h>
  21 #include <drm/drm_fb_helper.h>
  22 #include <drm/drm_gem_cma_helper.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/module.h>
  26 #include <linux/of_graph.h>
  27 #include <linux/component.h>
  28 #include <linux/console.h>
  29
  30 #include "rockchip_drm_drv.h"
  31 #include "rockchip_drm_fb.h"
  32 #include "rockchip_drm_fbdev.h"
  33 #include "rockchip_drm_gem.h"
  34
  35 #define DRIVER_NAME     "rockchip"
  36 #define DRIVER_DESC     "RockChip Soc DRM"
  37 #define DRIVER_DATE     "20140818"
  38 #define DRIVER_MAJOR    1
  39 #define DRIVER_MINOR    0
  40
  41 static bool is_support_iommu = true;
  42 static struct drm_driver rockchip_drm_driver;
  43
  44 /*
  45  * Attach a (component) device to the shared drm dma mapping from master drm
  46  * device.  This is used by the VOPs to map GEM buffers to a common DMA
  47  * mapping.
  48  */
  49 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
  50                                    struct device *dev)
  51 {
  52         struct dma_iommu_mapping *mapping = drm_dev->dev->archdata.mapping;
  53         int ret;
  54
  55         if (!is_support_iommu)
  56                 return 0;
  57
  58         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
  59         if (ret)
  60                 return ret;
  61
  62         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
  63
  64         return arm_iommu_attach_device(dev, mapping);
  65 }
  66
  67 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
  68                                     struct device *dev)
  69 {
  70         if (!is_support_iommu)
  71                 return;
  72
  73         arm_iommu_detach_device(dev);
  74 }
  75
  76 int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
  77                                  const struct rockchip_crtc_funcs *crtc_funcs)
  78 {
  79         int pipe = drm_crtc_index(crtc);
  80         struct rockchip_drm_private *priv = crtc->dev->dev_private;
  81
  82         if (pipe >= ROCKCHIP_MAX_CRTC)
  83                 return -EINVAL;
  84
  85         priv->crtc_funcs[pipe] = crtc_funcs;
  86
  87         return 0;
  88 }
  89
  90 void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc)
  91 {
  92         int pipe = drm_crtc_index(crtc);
  93         struct rockchip_drm_private *priv = crtc->dev->dev_private;
  94
  95         if (pipe >= ROCKCHIP_MAX_CRTC)
  96                 return;
  97
  98         priv->crtc_funcs[pipe] = NULL;
  99 }
 100
 101 static struct drm_crtc *rockchip_crtc_from_pipe(struct drm_device *drm,
 102                                                 int pipe)
 103 {
 104         struct drm_crtc *crtc;
 105         int i = 0;
 106
 107         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
 108                 if (i++ == pipe)
 109                         return crtc;
 110
 111         return NULL;
 112 }
 113
 114 static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev,
 115                                            unsigned int pipe)
 116 {
 117         struct rockchip_drm_private *priv = dev->dev_private;
 118         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 119
 120         if (crtc && priv->crtc_funcs[pipe] &&
 121             priv->crtc_funcs[pipe]->enable_vblank)
 122                 return priv->crtc_funcs[pipe]->enable_vblank(crtc);
 123
 124         return 0;
 125 }
 126
 127 static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
 128                                              unsigned int pipe)
 129 {
 130         struct rockchip_drm_private *priv = dev->dev_private;
 131         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 132
 133         if (crtc && priv->crtc_funcs[pipe] &&
 134             priv->crtc_funcs[pipe]->enable_vblank)
 135                 priv->crtc_funcs[pipe]->disable_vblank(crtc);
 136 }
 137
 138 static int rockchip_drm_bind(struct device *dev)
 139 {
 140         struct drm_device *drm_dev;
 141         struct rockchip_drm_private *private;
 142         struct dma_iommu_mapping *mapping = NULL;
 143         int ret;
 144
 145         drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
 146         if (!drm_dev)
 147                 return -ENOMEM;
 148
 149         dev_set_drvdata(dev, drm_dev);
 150
 151         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 152         if (!private) {
 153                 ret = -ENOMEM;
 154                 goto err_free;
 155         }
 156
 157         drm_dev->dev_private = private;
 158
 159         drm_mode_config_init(drm_dev);
 160
 161         rockchip_drm_mode_config_init(drm_dev);
 162
 163         dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
 164                                       GFP_KERNEL);
 165         if (!dev->dma_parms) {
 166                 ret = -ENOMEM;
 167                 goto err_config_cleanup;
 168         }
 169
 170         if (is_support_iommu) {
 171                 /* TODO(djkurtz): fetch the mapping start/size from somewhere */
 172                 mapping = arm_iommu_create_mapping(&platform_bus_type,
 173                                                    0x00000000,
 174                                                    SZ_2G);
 175                 if (IS_ERR(mapping)) {
 176                         ret = PTR_ERR(mapping);
 177                         goto err_config_cleanup;
 178                 }
 179
 180                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 181                 if (ret)
 182                         goto err_release_mapping;
 183
 184                 dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
 185
 186                 ret = arm_iommu_attach_device(dev, mapping);
 187                 if (ret)
 188                         goto err_release_mapping;
 189         }
 190
 191         /* Try to bind all sub drivers. */
 192         ret = component_bind_all(dev, drm_dev);
 193         if (ret)
 194                 goto err_detach_device;
 195
 196         /* init kms poll for handling hpd */
 197         drm_kms_helper_poll_init(drm_dev);
 198
 199         /*
 200          * enable drm irq mode.
 201          * - with irq_enabled = true, we can use the vblank feature.
 202          */
 203         drm_dev->irq_enabled = true;
 204
 205         ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
 206         if (ret)
 207                 goto err_kms_helper_poll_fini;
 208
 209         drm_mode_config_reset(drm_dev);
 210
 211         ret = rockchip_drm_fbdev_init(drm_dev);
 212         if (ret)
 213                 goto err_vblank_cleanup;
 214
 215         ret = drm_dev_register(drm_dev, 0);
 216         if (ret)
 217                 goto err_fbdev_fini;
 218
 219         if (is_support_iommu)
 220                 arm_iommu_release_mapping(mapping);
 221         return 0;
 222 err_fbdev_fini:
 223         rockchip_drm_fbdev_fini(drm_dev);
 224 err_vblank_cleanup:
 225         drm_vblank_cleanup(drm_dev);
 226 err_kms_helper_poll_fini:
 227         drm_kms_helper_poll_fini(drm_dev);
 228         component_unbind_all(dev, drm_dev);
 229 err_detach_device:
 230         if (is_support_iommu)
 231                 arm_iommu_detach_device(dev);
 232 err_release_mapping:
 233         if (is_support_iommu)
 234                 arm_iommu_release_mapping(mapping);
 235 err_config_cleanup:
 236         drm_mode_config_cleanup(drm_dev);
 237         drm_dev->dev_private = NULL;
 238 err_free:
 239         drm_dev_unref(drm_dev);
 240         return ret;
 241 }
 242
 243 static void rockchip_drm_unbind(struct device *dev)
 244 {
 245         struct drm_device *drm_dev = dev_get_drvdata(dev);
 246
 247         rockchip_drm_fbdev_fini(drm_dev);
 248         drm_vblank_cleanup(drm_dev);
 249         drm_kms_helper_poll_fini(drm_dev);
 250         component_unbind_all(dev, drm_dev);
 251         if (is_support_iommu)
 252                 arm_iommu_detach_device(dev);
 253         drm_mode_config_cleanup(drm_dev);
 254         drm_dev->dev_private = NULL;
 255         drm_dev_unregister(drm_dev);
 256         drm_dev_unref(drm_dev);
 257         dev_set_drvdata(dev, NULL);
 258 }
 259
 260 static void rockchip_drm_lastclose(struct drm_device *dev)
 261 {
 262         struct rockchip_drm_private *priv = dev->dev_private;
 263
 264         drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
 265 }
 266
 267 static const struct file_operations rockchip_drm_driver_fops = {
 268         .owner = THIS_MODULE,
 269         .open = drm_open,
 270         .mmap = rockchip_gem_mmap,
 271         .poll = drm_poll,
 272         .read = drm_read,
 273         .unlocked_ioctl = drm_ioctl,
 274 #ifdef CONFIG_COMPAT
 275         .compat_ioctl = drm_compat_ioctl,
 276 #endif
 277         .release = drm_release,
 278 };
 279
 280 static struct drm_driver rockchip_drm_driver = {
 281         .driver_features        = DRIVER_MODESET | DRIVER_GEM |
 282                                   DRIVER_PRIME | DRIVER_ATOMIC,
 283         .lastclose              = rockchip_drm_lastclose,
 284         .get_vblank_counter     = drm_vblank_no_hw_counter,
 285         .enable_vblank          = rockchip_drm_crtc_enable_vblank,
 286         .disable_vblank         = rockchip_drm_crtc_disable_vblank,
 287         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 288         .gem_free_object_unlocked = rockchip_gem_free_object,
 289         .dumb_create            = rockchip_gem_dumb_create,
 290         .dumb_map_offset        = rockchip_gem_dumb_map_offset,
 291         .dumb_destroy           = drm_gem_dumb_destroy,
 292         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 293         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 294         .gem_prime_import       = drm_gem_prime_import,
 295         .gem_prime_export       = drm_gem_prime_export,
 296         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 297         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 298         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 299         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 300         .fops                   = &rockchip_drm_driver_fops,
 301         .name   = DRIVER_NAME,
 302         .desc   = DRIVER_DESC,
 303         .date   = DRIVER_DATE,
 304         .major  = DRIVER_MAJOR,
 305         .minor  = DRIVER_MINOR,
 306 };
 307
 308 #ifdef CONFIG_PM_SLEEP
 309 void rockchip_drm_fb_suspend(struct drm_device *drm)
 310 {
 311         struct rockchip_drm_private *priv = drm->dev_private;
 312
 313         console_lock();
 314         drm_fb_helper_set_suspend(&priv->fbdev_helper, 1);
 315         console_unlock();
 316 }
 317
 318 void rockchip_drm_fb_resume(struct drm_device *drm)
 319 {
 320         struct rockchip_drm_private *priv = drm->dev_private;
 321
 322         console_lock();
 323         drm_fb_helper_set_suspend(&priv->fbdev_helper, 0);
 324         console_unlock();
 325 }
 326
 327 static int rockchip_drm_sys_suspend(struct device *dev)
 328 {
 329         struct drm_device *drm = dev_get_drvdata(dev);
 330         struct rockchip_drm_private *priv = drm->dev_private;
 331
 332         drm_kms_helper_poll_disable(drm);
 333         rockchip_drm_fb_suspend(drm);
 334
 335         priv->state = drm_atomic_helper_suspend(drm);
 336         if (IS_ERR(priv->state)) {
 337                 rockchip_drm_fb_resume(drm);
 338                 drm_kms_helper_poll_enable(drm);
 339                 return PTR_ERR(priv->state);
 340         }
 341
 342         return 0;
 343 }
 344
 345 static int rockchip_drm_sys_resume(struct device *dev)
 346 {
 347         struct drm_device *drm = dev_get_drvdata(dev);
 348         struct rockchip_drm_private *priv = drm->dev_private;
 349
 350         drm_atomic_helper_resume(drm, priv->state);
 351         rockchip_drm_fb_resume(drm);
 352         drm_kms_helper_poll_enable(drm);
 353
 354         return 0;
 355 }
 356 #endif
 357
 358 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 359         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 360                                 rockchip_drm_sys_resume)
 361 };
 362
 363 static int compare_of(struct device *dev, void *data)
 364 {
 365         struct device_node *np = data;
 366
 367         return dev->of_node == np;
 368 }
 369
 370 static void rockchip_add_endpoints(struct device *dev,
 371                                    struct component_match **match,
 372                                    struct device_node *port)
 373 {
 374         struct device_node *ep, *remote;
 375
 376         for_each_child_of_node(port, ep) {
 377                 remote = of_graph_get_remote_port_parent(ep);
 378                 if (!remote || !of_device_is_available(remote)) {
 379                         of_node_put(remote);
 380                         continue;
 381                 } else if (!of_device_is_available(remote->parent)) {
 382                         dev_warn(dev, "parent device of %s is not available\n",
 383                                  remote->full_name);
 384                         of_node_put(remote);
 385                         continue;
 386                 }
 387
 388                 component_match_add(dev, match, compare_of, remote);
 389                 of_node_put(remote);
 390         }
 391 }
 392
 393 static const struct component_master_ops rockchip_drm_ops = {
 394         .bind = rockchip_drm_bind,
 395         .unbind = rockchip_drm_unbind,
 396 };
 397
 398 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 399 {
 400         struct device *dev = &pdev->dev;
 401         struct component_match *match = NULL;
 402         struct device_node *np = dev->of_node;
 403         struct device_node *port;
 404         int i;
 405
 406         if (!np)
 407                 return -ENODEV;
 408         /*
 409          * Bind the crtc ports first, so that
 410          * drm_of_find_possible_crtcs called from encoder .bind callbacks
 411          * works as expected.
 412          */
 413         for (i = 0;; i++) {
 414                 struct device_node *iommu;
 415
 416                 port = of_parse_phandle(np, "ports", i);
 417                 if (!port)
 418                         break;
 419
 420                 if (!of_device_is_available(port->parent)) {
 421                         of_node_put(port);
 422                         continue;
 423                 }
 424
 425                 iommu = of_parse_phandle(port->parent, "iommus", 0);
 426                 if (!iommu || !of_device_is_available(iommu->parent)) {
 427                         dev_dbg(dev, "no iommu attached for %s, using non-iommu buffers\n",
 428                                 port->parent->full_name);
 429                         /*
 430                          * if there is a crtc not support iommu, force set all
 431                          * crtc use non-iommu buffer.
 432                          */
 433                         is_support_iommu = false;
 434                 }
 435
 436                 of_node_put(iommu);
 437                 component_match_add(dev, &match, compare_of, port->parent);
 438                 of_node_put(port);
 439         }
 440
 441         if (i == 0) {
 442                 dev_err(dev, "missing 'ports' property\n");
 443                 return -ENODEV;
 444         }
 445
 446         if (!match) {
 447                 dev_err(dev, "No available vop found for display-subsystem.\n");
 448                 return -ENODEV;
 449         }
 450         /*
 451          * For each bound crtc, bind the encoders attached to its
 452          * remote endpoint.
 453          */
 454         for (i = 0;; i++) {
 455                 port = of_parse_phandle(np, "ports", i);
 456                 if (!port)
 457                         break;
 458
 459                 if (!of_device_is_available(port->parent)) {
 460                         of_node_put(port);
 461                         continue;
 462                 }
 463
 464                 rockchip_add_endpoints(dev, &match, port);
 465                 of_node_put(port);
 466         }
 467
 468         return component_master_add_with_match(dev, &rockchip_drm_ops, match);
 469 }
 470
 471 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 472 {
 473         component_master_del(&pdev->dev, &rockchip_drm_ops);
 474
 475         return 0;
 476 }
 477
 478 static const struct of_device_id rockchip_drm_dt_ids[] = {
 479         { .compatible = "rockchip,display-subsystem", },
 480         { /* sentinel */ },
 481 };
 482 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 483
 484 static struct platform_driver rockchip_drm_platform_driver = {
 485         .probe = rockchip_drm_platform_probe,
 486         .remove = rockchip_drm_platform_remove,
 487         .driver = {
 488                 .name = "rockchip-drm",
 489                 .of_match_table = rockchip_drm_dt_ids,
 490                 .pm = &rockchip_drm_pm_ops,
 491         },
 492 };
 493
 494 module_platform_driver(rockchip_drm_platform_driver);
 495
 496 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 497 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 498 MODULE_LICENSE("GPL v2");