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_buf.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 drm_framebuffer  *fb;
  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_fbdev *exynos_fb = to_exynos_fbdev(helper);
  93         struct exynos_drm_buf_entry *entry;
  94         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  95         unsigned long offset;
  96
  97         DRM_DEBUG_KMS("%s\n", __FILE__);
  98
  99         exynos_fb->fb = fb;
 100
 101         drm_fb_helper_fill_fix(fbi, fb->pitch, fb->depth);
 102         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
 103
 104         entry = exynos_drm_fb_get_buf(fb);
 105         if (!entry) {
 106                 DRM_LOG_KMS("entry is null.\n");
 107                 return -EFAULT;
 108         }
 109
 110         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 111         offset += fbi->var.yoffset * fb->pitch;
 112
 113         dev->mode_config.fb_base = entry->paddr;
 114         fbi->screen_base = entry->vaddr + offset;
 115         fbi->fix.smem_start = entry->paddr + offset;
 116         fbi->screen_size = size;
 117         fbi->fix.smem_len = size;
 118
 119         return 0;
 120 }
 121
 122 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 123                                     struct drm_fb_helper_surface_size *sizes)
 124 {
 125         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 126         struct drm_device *dev = helper->dev;
 127         struct fb_info *fbi;
 128         struct drm_mode_fb_cmd mode_cmd = { 0 };
 129         struct platform_device *pdev = dev->platformdev;
 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.bpp = sizes->surface_bpp;
 141         mode_cmd.depth = sizes->surface_depth;
 142
 143         mutex_lock(&dev->struct_mutex);
 144
 145         fbi = framebuffer_alloc(0, &pdev->dev);
 146         if (!fbi) {
 147                 DRM_ERROR("failed to allocate fb info.\n");
 148                 ret = -ENOMEM;
 149                 goto out;
 150         }
 151
 152         exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
 153         if (IS_ERR_OR_NULL(exynos_fbdev->fb)) {
 154                 DRM_ERROR("failed to create drm framebuffer.\n");
 155                 ret = PTR_ERR(exynos_fbdev->fb);
 156                 goto out;
 157         }
 158
 159         helper->fb = exynos_fbdev->fb;
 160         helper->fbdev = fbi;
 161
 162         fbi->par = helper;
 163         fbi->flags = FBINFO_FLAG_DEFAULT;
 164         fbi->fbops = &exynos_drm_fb_ops;
 165
 166         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 167         if (ret) {
 168                 DRM_ERROR("failed to allocate cmap.\n");
 169                 goto out;
 170         }
 171
 172         ret = exynos_drm_fbdev_update(helper, helper->fb);
 173         if (ret < 0)
 174                 fb_dealloc_cmap(&fbi->cmap);
 175
 176 /*
 177  * if failed, all resources allocated above would be released by
 178  * drm_mode_config_cleanup() when drm_load() had been called prior
 179  * to any specific driver such as fimd or hdmi driver.
 180  */
 181 out:
 182         mutex_unlock(&dev->struct_mutex);
 183         return ret;
 184 }
 185
 186 static bool
 187 exynos_drm_fbdev_is_samefb(struct drm_framebuffer *fb,
 188                             struct drm_fb_helper_surface_size *sizes)
 189 {
 190         if (fb->width != sizes->surface_width)
 191                 return false;
 192         if (fb->height != sizes->surface_height)
 193                 return false;
 194         if (fb->bits_per_pixel != sizes->surface_bpp)
 195                 return false;
 196         if (fb->depth != sizes->surface_depth)
 197                 return false;
 198
 199         return true;
 200 }
 201
 202 static int exynos_drm_fbdev_recreate(struct drm_fb_helper *helper,
 203                                       struct drm_fb_helper_surface_size *sizes)
 204 {
 205         struct drm_device *dev = helper->dev;
 206         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 207         struct drm_framebuffer *fb = exynos_fbdev->fb;
 208         struct drm_mode_fb_cmd mode_cmd = { 0 };
 209
 210         DRM_DEBUG_KMS("%s\n", __FILE__);
 211
 212         if (helper->fb != fb) {
 213                 DRM_ERROR("drm framebuffer is different\n");
 214                 return -EINVAL;
 215         }
 216
 217         if (exynos_drm_fbdev_is_samefb(fb, sizes))
 218                 return 0;
 219
 220         mode_cmd.width = sizes->surface_width;
 221         mode_cmd.height = sizes->surface_height;
 222         mode_cmd.bpp = sizes->surface_bpp;
 223         mode_cmd.depth = sizes->surface_depth;
 224
 225         if (fb->funcs->destroy)
 226                 fb->funcs->destroy(fb);
 227
 228         exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
 229         if (IS_ERR(exynos_fbdev->fb)) {
 230                 DRM_ERROR("failed to allocate fb.\n");
 231                 return PTR_ERR(exynos_fbdev->fb);
 232         }
 233
 234         helper->fb = exynos_fbdev->fb;
 235         return exynos_drm_fbdev_update(helper, helper->fb);
 236 }
 237
 238 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
 239                                    struct drm_fb_helper_surface_size *sizes)
 240 {
 241         int ret = 0;
 242
 243         DRM_DEBUG_KMS("%s\n", __FILE__);
 244
 245         if (!helper->fb) {
 246                 ret = exynos_drm_fbdev_create(helper, sizes);
 247                 if (ret < 0) {
 248                         DRM_ERROR("failed to create fbdev.\n");
 249                         return ret;
 250                 }
 251
 252                 /*
 253                  * fb_helper expects a value more than 1 if succeed
 254                  * because register_framebuffer() should be called.
 255                  */
 256                 ret = 1;
 257         } else {
 258                 ret = exynos_drm_fbdev_recreate(helper, sizes);
 259                 if (ret < 0) {
 260                         DRM_ERROR("failed to reconfigure fbdev\n");
 261                         return ret;
 262                 }
 263         }
 264
 265         return ret;
 266 }
 267
 268 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 269         .fb_probe =     exynos_drm_fbdev_probe,
 270 };
 271
 272 int exynos_drm_fbdev_init(struct drm_device *dev)
 273 {
 274         struct exynos_drm_fbdev *fbdev;
 275         struct exynos_drm_private *private = dev->dev_private;
 276         struct drm_fb_helper *helper;
 277         unsigned int num_crtc;
 278         int ret;
 279
 280         DRM_DEBUG_KMS("%s\n", __FILE__);
 281
 282         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 283                 return 0;
 284
 285         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 286         if (!fbdev) {
 287                 DRM_ERROR("failed to allocate drm fbdev.\n");
 288                 return -ENOMEM;
 289         }
 290
 291         private->fb_helper = helper = &fbdev->drm_fb_helper;
 292         helper->funcs = &exynos_drm_fb_helper_funcs;
 293
 294         num_crtc = dev->mode_config.num_crtc;
 295
 296         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 297         if (ret < 0) {
 298                 DRM_ERROR("failed to initialize drm fb helper.\n");
 299                 goto err_init;
 300         }
 301
 302         ret = drm_fb_helper_single_add_all_connectors(helper);
 303         if (ret < 0) {
 304                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 305                 goto err_setup;
 306
 307         }
 308
 309         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 310         if (ret < 0) {
 311                 DRM_ERROR("failed to set up hw configuration.\n");
 312                 goto err_setup;
 313         }
 314
 315         return 0;
 316
 317 err_setup:
 318         drm_fb_helper_fini(helper);
 319
 320 err_init:
 321         private->fb_helper = NULL;
 322         kfree(fbdev);
 323
 324         return ret;
 325 }
 326
 327 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 328                                       struct drm_fb_helper *fb_helper)
 329 {
 330         struct drm_framebuffer *fb;
 331
 332         /* release drm framebuffer and real buffer */
 333         if (fb_helper->fb && fb_helper->fb->funcs) {
 334                 fb = fb_helper->fb;
 335                 if (fb && fb->funcs->destroy)
 336                         fb->funcs->destroy(fb);
 337         }
 338
 339         /* release linux framebuffer */
 340         if (fb_helper->fbdev) {
 341                 struct fb_info *info;
 342                 int ret;
 343
 344                 info = fb_helper->fbdev;
 345                 ret = unregister_framebuffer(info);
 346                 if (ret < 0)
 347                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 348
 349                 if (info->cmap.len)
 350                         fb_dealloc_cmap(&info->cmap);
 351
 352                 framebuffer_release(info);
 353         }
 354
 355         drm_fb_helper_fini(fb_helper);
 356 }
 357
 358 void exynos_drm_fbdev_fini(struct drm_device *dev)
 359 {
 360         struct exynos_drm_private *private = dev->dev_private;
 361         struct exynos_drm_fbdev *fbdev;
 362
 363         if (!private || !private->fb_helper)
 364                 return;
 365
 366         fbdev = to_exynos_fbdev(private->fb_helper);
 367
 368         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 369         kfree(fbdev);
 370         private->fb_helper = NULL;
 371 }
 372
 373 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 374 {
 375         struct exynos_drm_private *private = dev->dev_private;
 376
 377         if (!private || !private->fb_helper)
 378                 return;
 379
 380         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 381 }
 382
 383 int exynos_drm_fbdev_reinit(struct drm_device *dev)
 384 {
 385         struct exynos_drm_private *private = dev->dev_private;
 386         struct drm_fb_helper *fb_helper;
 387         int ret;
 388
 389         if (!private)
 390                 return -EINVAL;
 391
 392         /*
 393          * if all sub drivers were unloaded then num_connector is 0
 394          * so at this time, the framebuffers also should be destroyed.
 395          */
 396         if (!dev->mode_config.num_connector) {
 397                 exynos_drm_fbdev_fini(dev);
 398                 return 0;
 399         }
 400
 401         fb_helper = private->fb_helper;
 402
 403         if (fb_helper) {
 404                 struct list_head temp_list;
 405
 406                 INIT_LIST_HEAD(&temp_list);
 407
 408                 /*
 409                  * fb_helper is reintialized but kernel fb is reused
 410                  * so kernel_fb_list need to be backuped and restored
 411                  */
 412                 if (!list_empty(&fb_helper->kernel_fb_list))
 413                         list_replace_init(&fb_helper->kernel_fb_list,
 414                                         &temp_list);
 415
 416                 drm_fb_helper_fini(fb_helper);
 417
 418                 ret = drm_fb_helper_init(dev, fb_helper,
 419                                 dev->mode_config.num_crtc, MAX_CONNECTOR);
 420                 if (ret < 0) {
 421                         DRM_ERROR("failed to initialize drm fb helper\n");
 422                         return ret;
 423                 }
 424
 425                 if (!list_empty(&temp_list))
 426                         list_replace(&temp_list, &fb_helper->kernel_fb_list);
 427
 428                 ret = drm_fb_helper_single_add_all_connectors(fb_helper);
 429                 if (ret < 0) {
 430                         DRM_ERROR("failed to add fb helper to connectors\n");
 431                         goto err;
 432                 }
 433
 434                 ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
 435                 if (ret < 0) {
 436                         DRM_ERROR("failed to set up hw configuration.\n");
 437                         goto err;
 438                 }
 439         } else {
 440                 /*
 441                  * if drm_load() failed whem drm load() was called prior
 442                  * to specific drivers, fb_helper must be NULL and so
 443                  * this fuction should be called again to re-initialize and
 444                  * re-configure the fb helper. it means that this function
 445                  * has been called by the specific drivers.
 446                  */
 447                 ret = exynos_drm_fbdev_init(dev);
 448         }
 449
 450         return ret;
 451
 452 err:
 453         /*
 454          * if drm_load() failed when drm load() was called prior
 455          * to specific drivers, the fb_helper must be NULL and so check it.
 456          */
 457         if (fb_helper)
 458                 drm_fb_helper_fini(fb_helper);
 459
 460         return ret;
 461 }
 462
 463 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 464 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 465 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 466 MODULE_DESCRIPTION("Samsung SoC DRM FBDEV Driver");
 467 MODULE_LICENSE("GPL");