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 int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
 199                                    struct drm_fb_helper_surface_size *sizes)
 200 {
 201         int ret = 0;
 202
 203         DRM_DEBUG_KMS("%s\n", __FILE__);
 204
 205         /*
 206          * with !helper->fb, it means that this funcion is called first time
 207          * and after that, the helper->fb would be used as clone mode.
 208          */
 209         if (!helper->fb) {
 210                 ret = exynos_drm_fbdev_create(helper, sizes);
 211                 if (ret < 0) {
 212                         DRM_ERROR("failed to create fbdev.\n");
 213                         return ret;
 214                 }
 215
 216                 /*
 217                  * fb_helper expects a value more than 1 if succeed
 218                  * because register_framebuffer() should be called.
 219                  */
 220                 ret = 1;
 221         }
 222
 223         return ret;
 224 }
 225
 226 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 227         .fb_probe =     exynos_drm_fbdev_probe,
 228 };
 229
 230 int exynos_drm_fbdev_init(struct drm_device *dev)
 231 {
 232         struct exynos_drm_fbdev *fbdev;
 233         struct exynos_drm_private *private = dev->dev_private;
 234         struct drm_fb_helper *helper;
 235         unsigned int num_crtc;
 236         int ret;
 237
 238         DRM_DEBUG_KMS("%s\n", __FILE__);
 239
 240         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 241                 return 0;
 242
 243         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 244         if (!fbdev) {
 245                 DRM_ERROR("failed to allocate drm fbdev.\n");
 246                 return -ENOMEM;
 247         }
 248
 249         private->fb_helper = helper = &fbdev->drm_fb_helper;
 250         helper->funcs = &exynos_drm_fb_helper_funcs;
 251
 252         num_crtc = dev->mode_config.num_crtc;
 253
 254         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 255         if (ret < 0) {
 256                 DRM_ERROR("failed to initialize drm fb helper.\n");
 257                 goto err_init;
 258         }
 259
 260         ret = drm_fb_helper_single_add_all_connectors(helper);
 261         if (ret < 0) {
 262                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 263                 goto err_setup;
 264
 265         }
 266
 267         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 268         if (ret < 0) {
 269                 DRM_ERROR("failed to set up hw configuration.\n");
 270                 goto err_setup;
 271         }
 272
 273         return 0;
 274
 275 err_setup:
 276         drm_fb_helper_fini(helper);
 277
 278 err_init:
 279         private->fb_helper = NULL;
 280         kfree(fbdev);
 281
 282         return ret;
 283 }
 284
 285 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 286                                       struct drm_fb_helper *fb_helper)
 287 {
 288         struct drm_framebuffer *fb;
 289
 290         /* release drm framebuffer and real buffer */
 291         if (fb_helper->fb && fb_helper->fb->funcs) {
 292                 fb = fb_helper->fb;
 293                 if (fb && fb->funcs->destroy)
 294                         fb->funcs->destroy(fb);
 295         }
 296
 297         /* release linux framebuffer */
 298         if (fb_helper->fbdev) {
 299                 struct fb_info *info;
 300                 int ret;
 301
 302                 info = fb_helper->fbdev;
 303                 ret = unregister_framebuffer(info);
 304                 if (ret < 0)
 305                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 306
 307                 if (info->cmap.len)
 308                         fb_dealloc_cmap(&info->cmap);
 309
 310                 framebuffer_release(info);
 311         }
 312
 313         drm_fb_helper_fini(fb_helper);
 314 }
 315
 316 void exynos_drm_fbdev_fini(struct drm_device *dev)
 317 {
 318         struct exynos_drm_private *private = dev->dev_private;
 319         struct exynos_drm_fbdev *fbdev;
 320
 321         if (!private || !private->fb_helper)
 322                 return;
 323
 324         fbdev = to_exynos_fbdev(private->fb_helper);
 325
 326         if (fbdev->exynos_gem_obj)
 327                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 328
 329         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 330         kfree(fbdev);
 331         private->fb_helper = NULL;
 332 }
 333
 334 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 335 {
 336         struct exynos_drm_private *private = dev->dev_private;
 337
 338         if (!private || !private->fb_helper)
 339                 return;
 340
 341         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 342 }
 343
 344 int exynos_drm_fbdev_reinit(struct drm_device *dev)
 345 {
 346         struct exynos_drm_private *private = dev->dev_private;
 347         struct drm_fb_helper *fb_helper;
 348         int ret;
 349
 350         if (!private)
 351                 return -EINVAL;
 352
 353         /*
 354          * if all sub drivers were unloaded then num_connector is 0
 355          * so at this time, the framebuffers also should be destroyed.
 356          */
 357         if (!dev->mode_config.num_connector) {
 358                 exynos_drm_fbdev_fini(dev);
 359                 return 0;
 360         }
 361
 362         fb_helper = private->fb_helper;
 363
 364         if (fb_helper) {
 365                 struct list_head temp_list;
 366
 367                 INIT_LIST_HEAD(&temp_list);
 368
 369                 /*
 370                  * fb_helper is reintialized but kernel fb is reused
 371                  * so kernel_fb_list need to be backuped and restored
 372                  */
 373                 if (!list_empty(&fb_helper->kernel_fb_list))
 374                         list_replace_init(&fb_helper->kernel_fb_list,
 375                                         &temp_list);
 376
 377                 drm_fb_helper_fini(fb_helper);
 378
 379                 ret = drm_fb_helper_init(dev, fb_helper,
 380                                 dev->mode_config.num_crtc, MAX_CONNECTOR);
 381                 if (ret < 0) {
 382                         DRM_ERROR("failed to initialize drm fb helper\n");
 383                         return ret;
 384                 }
 385
 386                 if (!list_empty(&temp_list))
 387                         list_replace(&temp_list, &fb_helper->kernel_fb_list);
 388
 389                 ret = drm_fb_helper_single_add_all_connectors(fb_helper);
 390                 if (ret < 0) {
 391                         DRM_ERROR("failed to add fb helper to connectors\n");
 392                         goto err;
 393                 }
 394
 395                 ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
 396                 if (ret < 0) {
 397                         DRM_ERROR("failed to set up hw configuration.\n");
 398                         goto err;
 399                 }
 400         } else {
 401                 /*
 402                  * if drm_load() failed whem drm load() was called prior
 403                  * to specific drivers, fb_helper must be NULL and so
 404                  * this fuction should be called again to re-initialize and
 405                  * re-configure the fb helper. it means that this function
 406                  * has been called by the specific drivers.
 407                  */
 408                 ret = exynos_drm_fbdev_init(dev);
 409         }
 410
 411         return ret;
 412
 413 err:
 414         /*
 415          * if drm_load() failed when drm load() was called prior
 416          * to specific drivers, the fb_helper must be NULL and so check it.
 417          */
 418         if (fb_helper)
 419                 drm_fb_helper_fini(fb_helper);
 420
 421         return ret;
 422 }
 423
 424 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 425 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 426 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 427 MODULE_DESCRIPTION("Samsung SoC DRM FBDEV Driver");
 428 MODULE_LICENSE("GPL");