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 #include "exynos_drm_buf.h"
  38
  39 #define MAX_CONNECTOR           4
  40 #define PREFERRED_BPP           32
  41
  42 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  43                                 drm_fb_helper)
  44
  45 struct exynos_drm_fbdev {
  46         struct drm_fb_helper    drm_fb_helper;
  47         struct drm_framebuffer  *fb;
  48 };
  49
  50 static int exynos_drm_fbdev_set_par(struct fb_info *info)
  51 {
  52         struct fb_var_screeninfo *var = &info->var;
  53
  54         switch (var->bits_per_pixel) {
  55         case 32:
  56         case 24:
  57         case 18:
  58         case 16:
  59         case 12:
  60                 info->fix.visual = FB_VISUAL_TRUECOLOR;
  61                 break;
  62         case 1:
  63                 info->fix.visual = FB_VISUAL_MONO01;
  64                 break;
  65         default:
  66                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
  67                 break;
  68         }
  69
  70         info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
  71
  72         return drm_fb_helper_set_par(info);
  73 }
  74
  75
  76 static struct fb_ops exynos_drm_fb_ops = {
  77         .owner          = THIS_MODULE,
  78         .fb_fillrect    = cfb_fillrect,
  79         .fb_copyarea    = cfb_copyarea,
  80         .fb_imageblit   = cfb_imageblit,
  81         .fb_check_var   = drm_fb_helper_check_var,
  82         .fb_set_par     = exynos_drm_fbdev_set_par,
  83         .fb_blank       = drm_fb_helper_blank,
  84         .fb_pan_display = drm_fb_helper_pan_display,
  85         .fb_setcmap     = drm_fb_helper_setcmap,
  86 };
  87
  88 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  89                                      struct drm_framebuffer *fb)
  90 {
  91         struct fb_info *fbi = helper->fbdev;
  92         struct drm_device *dev = helper->dev;
  93         struct exynos_drm_fbdev *exynos_fb = to_exynos_fbdev(helper);
  94         struct exynos_drm_gem_buf *buffer;
  95         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  96         unsigned long offset;
  97
  98         DRM_DEBUG_KMS("%s\n", __FILE__);
  99
 100         exynos_fb->fb = fb;
 101
 102         drm_fb_helper_fill_fix(fbi, fb->pitch, fb->depth);
 103         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
 104
 105         buffer = exynos_drm_fb_get_buf(fb);
 106         if (!buffer) {
 107                 DRM_LOG_KMS("buffer is null.\n");
 108                 return -EFAULT;
 109         }
 110
 111         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 112         offset += fbi->var.yoffset * fb->pitch;
 113
 114         dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 115         fbi->screen_base = buffer->kvaddr + offset;
 116         fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
 117         fbi->screen_size = size;
 118         fbi->fix.smem_len = size;
 119
 120         return 0;
 121 }
 122
 123 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 124                                     struct drm_fb_helper_surface_size *sizes)
 125 {
 126         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 127         struct drm_device *dev = helper->dev;
 128         struct fb_info *fbi;
 129         struct drm_mode_fb_cmd mode_cmd = { 0 };
 130         struct platform_device *pdev = dev->platformdev;
 131         int ret;
 132
 133         DRM_DEBUG_KMS("%s\n", __FILE__);
 134
 135         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 136                         sizes->surface_width, sizes->surface_height,
 137                         sizes->surface_bpp);
 138
 139         mode_cmd.width = sizes->surface_width;
 140         mode_cmd.height = sizes->surface_height;
 141         mode_cmd.bpp = sizes->surface_bpp;
 142         mode_cmd.depth = 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         exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
 154         if (IS_ERR_OR_NULL(exynos_fbdev->fb)) {
 155                 DRM_ERROR("failed to create drm framebuffer.\n");
 156                 ret = PTR_ERR(exynos_fbdev->fb);
 157                 goto out;
 158         }
 159
 160         helper->fb = exynos_fbdev->fb;
 161         helper->fbdev = fbi;
 162
 163         fbi->par = helper;
 164         fbi->flags = FBINFO_FLAG_DEFAULT;
 165         fbi->fbops = &exynos_drm_fb_ops;
 166
 167         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 168         if (ret) {
 169                 DRM_ERROR("failed to allocate cmap.\n");
 170                 goto out;
 171         }
 172
 173         ret = exynos_drm_fbdev_update(helper, helper->fb);
 174         if (ret < 0)
 175                 fb_dealloc_cmap(&fbi->cmap);
 176
 177 /*
 178  * if failed, all resources allocated above would be released by
 179  * drm_mode_config_cleanup() when drm_load() had been called prior
 180  * to any specific driver such as fimd or hdmi driver.
 181  */
 182 out:
 183         mutex_unlock(&dev->struct_mutex);
 184         return ret;
 185 }
 186
 187 static bool
 188 exynos_drm_fbdev_is_samefb(struct drm_framebuffer *fb,
 189                             struct drm_fb_helper_surface_size *sizes)
 190 {
 191         if (fb->width != sizes->surface_width)
 192                 return false;
 193         if (fb->height != sizes->surface_height)
 194                 return false;
 195         if (fb->bits_per_pixel != sizes->surface_bpp)
 196                 return false;
 197         if (fb->depth != sizes->surface_depth)
 198                 return false;
 199
 200         return true;
 201 }
 202
 203 static int exynos_drm_fbdev_recreate(struct drm_fb_helper *helper,
 204                                       struct drm_fb_helper_surface_size *sizes)
 205 {
 206         struct drm_device *dev = helper->dev;
 207         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 208         struct drm_framebuffer *fb = exynos_fbdev->fb;
 209         struct drm_mode_fb_cmd mode_cmd = { 0 };
 210
 211         DRM_DEBUG_KMS("%s\n", __FILE__);
 212
 213         if (helper->fb != fb) {
 214                 DRM_ERROR("drm framebuffer is different\n");
 215                 return -EINVAL;
 216         }
 217
 218         if (exynos_drm_fbdev_is_samefb(fb, sizes))
 219                 return 0;
 220
 221         mode_cmd.width = sizes->surface_width;
 222         mode_cmd.height = sizes->surface_height;
 223         mode_cmd.bpp = sizes->surface_bpp;
 224         mode_cmd.depth = sizes->surface_depth;
 225
 226         if (fb->funcs->destroy)
 227                 fb->funcs->destroy(fb);
 228
 229         exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
 230         if (IS_ERR(exynos_fbdev->fb)) {
 231                 DRM_ERROR("failed to allocate fb.\n");
 232                 return PTR_ERR(exynos_fbdev->fb);
 233         }
 234
 235         helper->fb = exynos_fbdev->fb;
 236         return exynos_drm_fbdev_update(helper, helper->fb);
 237 }
 238
 239 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
 240                                    struct drm_fb_helper_surface_size *sizes)
 241 {
 242         int ret = 0;
 243
 244         DRM_DEBUG_KMS("%s\n", __FILE__);
 245
 246         if (!helper->fb) {
 247                 ret = exynos_drm_fbdev_create(helper, sizes);
 248                 if (ret < 0) {
 249                         DRM_ERROR("failed to create fbdev.\n");
 250                         return ret;
 251                 }
 252
 253                 /*
 254                  * fb_helper expects a value more than 1 if succeed
 255                  * because register_framebuffer() should be called.
 256                  */
 257                 ret = 1;
 258         } else {
 259                 ret = exynos_drm_fbdev_recreate(helper, sizes);
 260                 if (ret < 0) {
 261                         DRM_ERROR("failed to reconfigure fbdev\n");
 262                         return ret;
 263                 }
 264         }
 265
 266         return ret;
 267 }
 268
 269 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 270         .fb_probe =     exynos_drm_fbdev_probe,
 271 };
 272
 273 int exynos_drm_fbdev_init(struct drm_device *dev)
 274 {
 275         struct exynos_drm_fbdev *fbdev;
 276         struct exynos_drm_private *private = dev->dev_private;
 277         struct drm_fb_helper *helper;
 278         unsigned int num_crtc;
 279         int ret;
 280
 281         DRM_DEBUG_KMS("%s\n", __FILE__);
 282
 283         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 284                 return 0;
 285
 286         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 287         if (!fbdev) {
 288                 DRM_ERROR("failed to allocate drm fbdev.\n");
 289                 return -ENOMEM;
 290         }
 291
 292         private->fb_helper = helper = &fbdev->drm_fb_helper;
 293         helper->funcs = &exynos_drm_fb_helper_funcs;
 294
 295         num_crtc = dev->mode_config.num_crtc;
 296
 297         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 298         if (ret < 0) {
 299                 DRM_ERROR("failed to initialize drm fb helper.\n");
 300                 goto err_init;
 301         }
 302
 303         ret = drm_fb_helper_single_add_all_connectors(helper);
 304         if (ret < 0) {
 305                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 306                 goto err_setup;
 307
 308         }
 309
 310         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 311         if (ret < 0) {
 312                 DRM_ERROR("failed to set up hw configuration.\n");
 313                 goto err_setup;
 314         }
 315
 316         return 0;
 317
 318 err_setup:
 319         drm_fb_helper_fini(helper);
 320
 321 err_init:
 322         private->fb_helper = NULL;
 323         kfree(fbdev);
 324
 325         return ret;
 326 }
 327
 328 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 329                                       struct drm_fb_helper *fb_helper)
 330 {
 331         struct drm_framebuffer *fb;
 332
 333         /* release drm framebuffer and real buffer */
 334         if (fb_helper->fb && fb_helper->fb->funcs) {
 335                 fb = fb_helper->fb;
 336                 if (fb && fb->funcs->destroy)
 337                         fb->funcs->destroy(fb);
 338         }
 339
 340         /* release linux framebuffer */
 341         if (fb_helper->fbdev) {
 342                 struct fb_info *info;
 343                 int ret;
 344
 345                 info = fb_helper->fbdev;
 346                 ret = unregister_framebuffer(info);
 347                 if (ret < 0)
 348                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 349
 350                 if (info->cmap.len)
 351                         fb_dealloc_cmap(&info->cmap);
 352
 353                 framebuffer_release(info);
 354         }
 355
 356         drm_fb_helper_fini(fb_helper);
 357 }
 358
 359 void exynos_drm_fbdev_fini(struct drm_device *dev)
 360 {
 361         struct exynos_drm_private *private = dev->dev_private;
 362         struct exynos_drm_fbdev *fbdev;
 363
 364         if (!private || !private->fb_helper)
 365                 return;
 366
 367         fbdev = to_exynos_fbdev(private->fb_helper);
 368
 369         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 370         kfree(fbdev);
 371         private->fb_helper = NULL;
 372 }
 373
 374 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 375 {
 376         struct exynos_drm_private *private = dev->dev_private;
 377
 378         if (!private || !private->fb_helper)
 379                 return;
 380
 381         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 382 }
 383
 384 int exynos_drm_fbdev_reinit(struct drm_device *dev)
 385 {
 386         struct exynos_drm_private *private = dev->dev_private;
 387         struct drm_fb_helper *fb_helper;
 388         int ret;
 389
 390         if (!private)
 391                 return -EINVAL;
 392
 393         /*
 394          * if all sub drivers were unloaded then num_connector is 0
 395          * so at this time, the framebuffers also should be destroyed.
 396          */
 397         if (!dev->mode_config.num_connector) {
 398                 exynos_drm_fbdev_fini(dev);
 399                 return 0;
 400         }
 401
 402         fb_helper = private->fb_helper;
 403
 404         if (fb_helper) {
 405                 struct list_head temp_list;
 406
 407                 INIT_LIST_HEAD(&temp_list);
 408
 409                 /*
 410                  * fb_helper is reintialized but kernel fb is reused
 411                  * so kernel_fb_list need to be backuped and restored
 412                  */
 413                 if (!list_empty(&fb_helper->kernel_fb_list))
 414                         list_replace_init(&fb_helper->kernel_fb_list,
 415                                         &temp_list);
 416
 417                 drm_fb_helper_fini(fb_helper);
 418
 419                 ret = drm_fb_helper_init(dev, fb_helper,
 420                                 dev->mode_config.num_crtc, MAX_CONNECTOR);
 421                 if (ret < 0) {
 422                         DRM_ERROR("failed to initialize drm fb helper\n");
 423                         return ret;
 424                 }
 425
 426                 if (!list_empty(&temp_list))
 427                         list_replace(&temp_list, &fb_helper->kernel_fb_list);
 428
 429                 ret = drm_fb_helper_single_add_all_connectors(fb_helper);
 430                 if (ret < 0) {
 431                         DRM_ERROR("failed to add fb helper to connectors\n");
 432                         goto err;
 433                 }
 434
 435                 ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
 436                 if (ret < 0) {
 437                         DRM_ERROR("failed to set up hw configuration.\n");
 438                         goto err;
 439                 }
 440         } else {
 441                 /*
 442                  * if drm_load() failed whem drm load() was called prior
 443                  * to specific drivers, fb_helper must be NULL and so
 444                  * this fuction should be called again to re-initialize and
 445                  * re-configure the fb helper. it means that this function
 446                  * has been called by the specific drivers.
 447                  */
 448                 ret = exynos_drm_fbdev_init(dev);
 449         }
 450
 451         return ret;
 452
 453 err:
 454         /*
 455          * if drm_load() failed when drm load() was called prior
 456          * to specific drivers, the fb_helper must be NULL and so check it.
 457          */
 458         if (fb_helper)
 459                 drm_fb_helper_fini(fb_helper);
 460
 461         return ret;
 462 }
 463
 464 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 465 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 466 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 467 MODULE_DESCRIPTION("Samsung SoC DRM FBDEV Driver");
 468 MODULE_LICENSE("GPL");