drivers/gpu/drm/exynos/exynos_drm_fbdev.c

   1 /* exynos_drm_fbdev.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the next
  17  * paragraph) shall be included in all copies or substantial portions of the
  18  * Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  26  * OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28
  29 #include "drmP.h"
  30 #include "drm_crtc.h"
  31 #include "drm_fb_helper.h"
  32 #include "drm_crtc_helper.h"
  33
  34 #include "exynos_drm_drv.h"
  35 #include "exynos_drm_fb.h"
  36 #include "exynos_drm_gem.h"
  37
  38 #define MAX_CONNECTOR           4
  39 #define PREFERRED_BPP           32
  40
  41 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  42                                 drm_fb_helper)
  43
  44 struct exynos_drm_fbdev {
  45         struct drm_fb_helper            drm_fb_helper;
  46         struct exynos_drm_gem_obj       *exynos_gem_obj;
  47 };
  48
  49 static int exynos_drm_fbdev_set_par(struct fb_info *info)
  50 {
  51         struct fb_var_screeninfo *var = &info->var;
  52
  53         switch (var->bits_per_pixel) {
  54         case 32:
  55         case 24:
  56         case 18:
  57         case 16:
  58         case 12:
  59                 info->fix.visual = FB_VISUAL_TRUECOLOR;
  60                 break;
  61         case 1:
  62                 info->fix.visual = FB_VISUAL_MONO01;
  63                 break;
  64         default:
  65                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
  66                 break;
  67         }
  68
  69         info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
  70
  71         return drm_fb_helper_set_par(info);
  72 }
  73
  74
  75 static struct fb_ops exynos_drm_fb_ops = {
  76         .owner          = THIS_MODULE,
  77         .fb_fillrect    = cfb_fillrect,
  78         .fb_copyarea    = cfb_copyarea,
  79         .fb_imageblit   = cfb_imageblit,
  80         .fb_check_var   = drm_fb_helper_check_var,
  81         .fb_set_par     = exynos_drm_fbdev_set_par,
  82         .fb_blank       = drm_fb_helper_blank,
  83         .fb_pan_display = drm_fb_helper_pan_display,
  84         .fb_setcmap     = drm_fb_helper_setcmap,
  85 };
  86
  87 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  88                                      struct drm_framebuffer *fb)
  89 {
  90         struct fb_info *fbi = helper->fbdev;
  91         struct drm_device *dev = helper->dev;
  92         struct exynos_drm_gem_buf *buffer;
  93         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  94         unsigned long offset;
  95
  96         DRM_DEBUG_KMS("%s\n", __FILE__);
  97
  98         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  99         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
 100
 101         /* RGB formats use only one buffer */
 102         buffer = exynos_drm_fb_buffer(fb, 0);
 103         if (!buffer) {
 104                 DRM_LOG_KMS("buffer is null.\n");
 105                 return -EFAULT;
 106         }
 107
 108         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 109         offset += fbi->var.yoffset * fb->pitches[0];
 110
 111         dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 112         fbi->screen_base = buffer->kvaddr + offset;
 113         fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
 114         fbi->screen_size = size;
 115         fbi->fix.smem_len = size;
 116
 117         return 0;
 118 }
 119
 120 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 121                                     struct drm_fb_helper_surface_size *sizes)
 122 {
 123         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 124         struct exynos_drm_gem_obj *exynos_gem_obj;
 125         struct drm_device *dev = helper->dev;
 126         struct fb_info *fbi;
 127         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 128         struct platform_device *pdev = dev->platformdev;
 129         unsigned long size;
 130         int ret;
 131
 132         DRM_DEBUG_KMS("%s\n", __FILE__);
 133
 134         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 135                         sizes->surface_width, sizes->surface_height,
 136                         sizes->surface_bpp);
 137
 138         mode_cmd.width = sizes->surface_width;
 139         mode_cmd.height = sizes->surface_height;
 140         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 141         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 142                                                           sizes->surface_depth);
 143
 144         mutex_lock(&dev->struct_mutex);
 145
 146         fbi = framebuffer_alloc(0, &pdev->dev);
 147         if (!fbi) {
 148                 DRM_ERROR("failed to allocate fb info.\n");
 149                 ret = -ENOMEM;
 150                 goto out;
 151         }
 152
 153         size = mode_cmd.pitches[0] * mode_cmd.height;
 154         exynos_gem_obj = exynos_drm_gem_create(dev, size);
 155         if (IS_ERR(exynos_gem_obj)) {
 156                 ret = PTR_ERR(exynos_gem_obj);
 157                 goto out;
 158         }
 159
 160         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 161
 162         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 163                         &exynos_gem_obj->base);
 164         if (IS_ERR_OR_NULL(helper->fb)) {
 165                 DRM_ERROR("failed to create drm framebuffer.\n");
 166                 ret = PTR_ERR(helper->fb);
 167                 goto out;
 168         }
 169
 170         helper->fbdev = fbi;
 171
 172         fbi->par = helper;
 173         fbi->flags = FBINFO_FLAG_DEFAULT;
 174         fbi->fbops = &exynos_drm_fb_ops;
 175
 176         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 177         if (ret) {
 178                 DRM_ERROR("failed to allocate cmap.\n");
 179                 goto out;
 180         }
 181
 182         ret = exynos_drm_fbdev_update(helper, helper->fb);
 183         if (ret < 0) {
 184                 fb_dealloc_cmap(&fbi->cmap);
 185                 goto out;
 186         }
 187
 188 /*
 189  * if failed, all resources allocated above would be released by
 190  * drm_mode_config_cleanup() when drm_load() had been called prior
 191  * to any specific driver such as fimd or hdmi driver.
 192  */
 193 out:
 194         mutex_unlock(&dev->struct_mutex);
 195         return ret;
 196 }
 197
 198 static bool
 199 exynos_drm_fbdev_is_samefb(struct drm_framebuffer *fb,
 200                             struct drm_fb_helper_surface_size *sizes)
 201 {
 202         if (fb->width != sizes->surface_width)
 203                 return false;
 204         if (fb->height != sizes->surface_height)
 205                 return false;
 206         if (fb->bits_per_pixel != sizes->surface_bpp)
 207                 return false;
 208         if (fb->depth != sizes->surface_depth)
 209                 return false;
 210
 211         return true;
 212 }
 213
 214 static int exynos_drm_fbdev_recreate(struct drm_fb_helper *helper,
 215                                       struct drm_fb_helper_surface_size *sizes)
 216 {
 217         struct drm_device *dev = helper->dev;
 218         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 219         struct exynos_drm_gem_obj *exynos_gem_obj;
 220         struct drm_framebuffer *fb = helper->fb;
 221         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 222         unsigned long size;
 223
 224         DRM_DEBUG_KMS("%s\n", __FILE__);
 225
 226         if (exynos_drm_fbdev_is_samefb(fb, sizes))
 227                 return 0;
 228
 229         mode_cmd.width = sizes->surface_width;
 230         mode_cmd.height = sizes->surface_height;
 231         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 232         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 233                                                           sizes->surface_depth);
 234
 235         if (exynos_fbdev->exynos_gem_obj)
 236                 exynos_drm_gem_destroy(exynos_fbdev->exynos_gem_obj);
 237
 238         if (fb->funcs->destroy)
 239                 fb->funcs->destroy(fb);
 240
 241         size = mode_cmd.pitches[0] * mode_cmd.height;
 242         exynos_gem_obj = exynos_drm_gem_create(dev, size);
 243         if (IS_ERR(exynos_gem_obj))
 244                 return PTR_ERR(exynos_gem_obj);
 245
 246         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 247
 248         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 249                         &exynos_gem_obj->base);
 250         if (IS_ERR_OR_NULL(helper->fb)) {
 251                 DRM_ERROR("failed to create drm framebuffer.\n");
 252                 return PTR_ERR(helper->fb);
 253         }
 254
 255         return exynos_drm_fbdev_update(helper, helper->fb);
 256 }
 257
 258 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
 259                                    struct drm_fb_helper_surface_size *sizes)
 260 {
 261         int ret = 0;
 262
 263         DRM_DEBUG_KMS("%s\n", __FILE__);
 264
 265         if (!helper->fb) {
 266                 ret = exynos_drm_fbdev_create(helper, sizes);
 267                 if (ret < 0) {
 268                         DRM_ERROR("failed to create fbdev.\n");
 269                         return ret;
 270                 }
 271
 272                 /*
 273                  * fb_helper expects a value more than 1 if succeed
 274                  * because register_framebuffer() should be called.
 275                  */
 276                 ret = 1;
 277         } else {
 278                 ret = exynos_drm_fbdev_recreate(helper, sizes);
 279                 if (ret < 0) {
 280                         DRM_ERROR("failed to reconfigure fbdev\n");
 281                         return ret;
 282                 }
 283         }
 284
 285         return ret;
 286 }
 287
 288 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 289         .fb_probe =     exynos_drm_fbdev_probe,
 290 };
 291
 292 int exynos_drm_fbdev_init(struct drm_device *dev)
 293 {
 294         struct exynos_drm_fbdev *fbdev;
 295         struct exynos_drm_private *private = dev->dev_private;
 296         struct drm_fb_helper *helper;
 297         unsigned int num_crtc;
 298         int ret;
 299
 300         DRM_DEBUG_KMS("%s\n", __FILE__);
 301
 302         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 303                 return 0;
 304
 305         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 306         if (!fbdev) {
 307                 DRM_ERROR("failed to allocate drm fbdev.\n");
 308                 return -ENOMEM;
 309         }
 310
 311         private->fb_helper = helper = &fbdev->drm_fb_helper;
 312         helper->funcs = &exynos_drm_fb_helper_funcs;
 313
 314         num_crtc = dev->mode_config.num_crtc;
 315
 316         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 317         if (ret < 0) {
 318                 DRM_ERROR("failed to initialize drm fb helper.\n");
 319                 goto err_init;
 320         }
 321
 322         ret = drm_fb_helper_single_add_all_connectors(helper);
 323         if (ret < 0) {
 324                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 325                 goto err_setup;
 326
 327         }
 328
 329         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 330         if (ret < 0) {
 331                 DRM_ERROR("failed to set up hw configuration.\n");
 332                 goto err_setup;
 333         }
 334
 335         return 0;
 336
 337 err_setup:
 338         drm_fb_helper_fini(helper);
 339
 340 err_init:
 341         private->fb_helper = NULL;
 342         kfree(fbdev);
 343
 344         return ret;
 345 }
 346
 347 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 348                                       struct drm_fb_helper *fb_helper)
 349 {
 350         struct drm_framebuffer *fb;
 351
 352         /* release drm framebuffer and real buffer */
 353         if (fb_helper->fb && fb_helper->fb->funcs) {
 354                 fb = fb_helper->fb;
 355                 if (fb && fb->funcs->destroy)
 356                         fb->funcs->destroy(fb);
 357         }
 358
 359         /* release linux framebuffer */
 360         if (fb_helper->fbdev) {
 361                 struct fb_info *info;
 362                 int ret;
 363
 364                 info = fb_helper->fbdev;
 365                 ret = unregister_framebuffer(info);
 366                 if (ret < 0)
 367                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 368
 369                 if (info->cmap.len)
 370                         fb_dealloc_cmap(&info->cmap);
 371
 372                 framebuffer_release(info);
 373         }
 374
 375         drm_fb_helper_fini(fb_helper);
 376 }
 377
 378 void exynos_drm_fbdev_fini(struct drm_device *dev)
 379 {
 380         struct exynos_drm_private *private = dev->dev_private;
 381         struct exynos_drm_fbdev *fbdev;
 382
 383         if (!private || !private->fb_helper)
 384                 return;
 385
 386         fbdev = to_exynos_fbdev(private->fb_helper);
 387
 388         if (fbdev->exynos_gem_obj)
 389                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 390
 391         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 392         kfree(fbdev);
 393         private->fb_helper = NULL;
 394 }
 395
 396 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 397 {
 398         struct exynos_drm_private *private = dev->dev_private;
 399
 400         if (!private || !private->fb_helper)
 401                 return;
 402
 403         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 404 }
 405
 406 int exynos_drm_fbdev_reinit(struct drm_device *dev)
 407 {
 408         struct exynos_drm_private *private = dev->dev_private;
 409         struct drm_fb_helper *fb_helper;
 410         int ret;
 411
 412         if (!private)
 413                 return -EINVAL;
 414
 415         /*
 416          * if all sub drivers were unloaded then num_connector is 0
 417          * so at this time, the framebuffers also should be destroyed.
 418          */
 419         if (!dev->mode_config.num_connector) {
 420                 exynos_drm_fbdev_fini(dev);
 421                 return 0;
 422         }
 423
 424         fb_helper = private->fb_helper;
 425
 426         if (fb_helper) {
 427                 struct list_head temp_list;
 428
 429                 INIT_LIST_HEAD(&temp_list);
 430
 431                 /*
 432                  * fb_helper is reintialized but kernel fb is reused
 433                  * so kernel_fb_list need to be backuped and restored
 434                  */
 435                 if (!list_empty(&fb_helper->kernel_fb_list))
 436                         list_replace_init(&fb_helper->kernel_fb_list,
 437                                         &temp_list);
 438
 439                 drm_fb_helper_fini(fb_helper);
 440
 441                 ret = drm_fb_helper_init(dev, fb_helper,
 442                                 dev->mode_config.num_crtc, MAX_CONNECTOR);
 443                 if (ret < 0) {
 444                         DRM_ERROR("failed to initialize drm fb helper\n");
 445                         return ret;
 446                 }
 447
 448                 if (!list_empty(&temp_list))
 449                         list_replace(&temp_list, &fb_helper->kernel_fb_list);
 450
 451                 ret = drm_fb_helper_single_add_all_connectors(fb_helper);
 452                 if (ret < 0) {
 453                         DRM_ERROR("failed to add fb helper to connectors\n");
 454                         goto err;
 455                 }
 456
 457                 ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
 458                 if (ret < 0) {
 459                         DRM_ERROR("failed to set up hw configuration.\n");
 460                         goto err;
 461                 }
 462         } else {
 463                 /*
 464                  * if drm_load() failed whem drm load() was called prior
 465                  * to specific drivers, fb_helper must be NULL and so
 466                  * this fuction should be called again to re-initialize and
 467                  * re-configure the fb helper. it means that this function
 468                  * has been called by the specific drivers.
 469                  */
 470                 ret = exynos_drm_fbdev_init(dev);
 471         }
 472
 473         return ret;
 474
 475 err:
 476         /*
 477          * if drm_load() failed when drm load() was called prior
 478          * to specific drivers, the fb_helper must be NULL and so check it.
 479          */
 480         if (fb_helper)
 481                 drm_fb_helper_fini(fb_helper);
 482
 483         return ret;
 484 }
 485
 486 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 487 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 488 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 489 MODULE_DESCRIPTION("Samsung SoC DRM FBDEV Driver");
 490 MODULE_LICENSE("GPL");