drivers/gpu/drm/exynos/exynos_drm_fb.c

   1 /* exynos_drm_fb.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_crtc_helper.h"
  32
  33 #include "exynos_drm_fb.h"
  34 #include "exynos_drm_buf.h"
  35 #include "exynos_drm_gem.h"
  36
  37 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
  38
  39 /*
  40  * exynos specific framebuffer structure.
  41  *
  42  * @fb: drm framebuffer obejct.
  43  * @exynos_gem_obj: exynos specific gem object containing a gem object.
  44  * @entry: pointer to exynos drm buffer entry object.
  45  *      - containing only the information to physically continuous memory
  46  *      region allocated at default framebuffer creation.
  47  */
  48 struct exynos_drm_fb {
  49         struct drm_framebuffer          fb;
  50         struct exynos_drm_gem_obj       *exynos_gem_obj;
  51         struct exynos_drm_buf_entry     *entry;
  52 };
  53
  54 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
  55 {
  56         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  57
  58         DRM_DEBUG_KMS("%s\n", __FILE__);
  59
  60         drm_framebuffer_cleanup(fb);
  61
  62         /*
  63          * default framebuffer has no gem object so
  64          * a buffer of the default framebuffer should be released at here.
  65          */
  66         if (!exynos_fb->exynos_gem_obj && exynos_fb->entry)
  67                 exynos_drm_buf_destroy(fb->dev, exynos_fb->entry);
  68
  69         kfree(exynos_fb);
  70         exynos_fb = NULL;
  71 }
  72
  73 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
  74                                         struct drm_file *file_priv,
  75                                         unsigned int *handle)
  76 {
  77         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  78
  79         DRM_DEBUG_KMS("%s\n", __FILE__);
  80
  81         return drm_gem_handle_create(file_priv,
  82                         &exynos_fb->exynos_gem_obj->base, handle);
  83 }
  84
  85 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
  86                                 struct drm_file *file_priv, unsigned flags,
  87                                 unsigned color, struct drm_clip_rect *clips,
  88                                 unsigned num_clips)
  89 {
  90         DRM_DEBUG_KMS("%s\n", __FILE__);
  91
  92         /* TODO */
  93
  94         return 0;
  95 }
  96
  97 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
  98         .destroy        = exynos_drm_fb_destroy,
  99         .create_handle  = exynos_drm_fb_create_handle,
 100         .dirty          = exynos_drm_fb_dirty,
 101 };
 102
 103 static struct drm_framebuffer *
 104 exynos_drm_fb_init(struct drm_file *file_priv, struct drm_device *dev,
 105                     struct drm_mode_fb_cmd *mode_cmd)
 106 {
 107         struct exynos_drm_fb *exynos_fb;
 108         struct drm_framebuffer *fb;
 109         struct exynos_drm_gem_obj *exynos_gem_obj = NULL;
 110         struct drm_gem_object *obj;
 111         unsigned int size;
 112         int ret;
 113
 114         DRM_DEBUG_KMS("%s\n", __FILE__);
 115
 116         mode_cmd->pitch = max(mode_cmd->pitch,
 117                         mode_cmd->width * (mode_cmd->bpp >> 3));
 118
 119         DRM_LOG_KMS("drm fb create(%dx%d)\n",
 120                         mode_cmd->width, mode_cmd->height);
 121
 122         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 123         if (!exynos_fb) {
 124                 DRM_ERROR("failed to allocate exynos drm framebuffer.\n");
 125                 return ERR_PTR(-ENOMEM);
 126         }
 127
 128         fb = &exynos_fb->fb;
 129         ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
 130         if (ret) {
 131                 DRM_ERROR("failed to initialize framebuffer.\n");
 132                 goto err_init;
 133         }
 134
 135         DRM_LOG_KMS("create: fb id: %d\n", fb->base.id);
 136
 137         size = mode_cmd->pitch * mode_cmd->height;
 138
 139         /*
 140          * mode_cmd->handle could be NULL at booting time or
 141          * with user request. if NULL, a new buffer or a gem object
 142          * would be allocated.
 143          */
 144         if (!mode_cmd->handle) {
 145                 if (!file_priv) {
 146                         struct exynos_drm_buf_entry *entry;
 147
 148                         /*
 149                          * in case that file_priv is NULL, it allocates
 150                          * only buffer and this buffer would be used
 151                          * for default framebuffer.
 152                          */
 153                         entry = exynos_drm_buf_create(dev, size);
 154                         if (IS_ERR(entry)) {
 155                                 ret = PTR_ERR(entry);
 156                                 goto err_buffer;
 157                         }
 158
 159                         exynos_fb->entry = entry;
 160
 161                         DRM_LOG_KMS("default fb: paddr = 0x%lx, size = 0x%x\n",
 162                                         (unsigned long)entry->paddr, size);
 163
 164                         goto out;
 165                 } else {
 166                         exynos_gem_obj = exynos_drm_gem_create(file_priv, dev,
 167                                                         size,
 168                                                         &mode_cmd->handle);
 169                         if (IS_ERR(exynos_gem_obj)) {
 170                                 ret = PTR_ERR(exynos_gem_obj);
 171                                 goto err_buffer;
 172                         }
 173                 }
 174         } else {
 175                 obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handle);
 176                 if (!obj) {
 177                         DRM_ERROR("failed to lookup gem object.\n");
 178                         goto err_buffer;
 179                 }
 180
 181                 exynos_gem_obj = to_exynos_gem_obj(obj);
 182
 183                 drm_gem_object_unreference_unlocked(obj);
 184         }
 185
 186         /*
 187          * if got a exynos_gem_obj from either a handle or
 188          * a new creation then exynos_fb->exynos_gem_obj is NULL
 189          * so that default framebuffer has no its own gem object,
 190          * only its own buffer object.
 191          */
 192         exynos_fb->entry = exynos_gem_obj->entry;
 193
 194         DRM_LOG_KMS("paddr = 0x%lx, size = 0x%x, gem object = 0x%x\n",
 195                         (unsigned long)exynos_fb->entry->paddr, size,
 196                         (unsigned int)&exynos_gem_obj->base);
 197
 198 out:
 199         exynos_fb->exynos_gem_obj = exynos_gem_obj;
 200
 201         drm_helper_mode_fill_fb_struct(fb, mode_cmd);
 202
 203         return fb;
 204
 205 err_buffer:
 206         drm_framebuffer_cleanup(fb);
 207
 208 err_init:
 209         kfree(exynos_fb);
 210
 211         return ERR_PTR(ret);
 212 }
 213
 214 struct drm_framebuffer *exynos_drm_fb_create(struct drm_device *dev,
 215                                               struct drm_file *file_priv,
 216                                               struct drm_mode_fb_cmd *mode_cmd)
 217 {
 218         DRM_DEBUG_KMS("%s\n", __FILE__);
 219
 220         return exynos_drm_fb_init(file_priv, dev, mode_cmd);
 221 }
 222
 223 struct exynos_drm_buf_entry *exynos_drm_fb_get_buf(struct drm_framebuffer *fb)
 224 {
 225         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 226         struct exynos_drm_buf_entry *entry;
 227
 228         DRM_DEBUG_KMS("%s\n", __FILE__);
 229
 230         entry = exynos_fb->entry;
 231         if (!entry)
 232                 return NULL;
 233
 234         DRM_DEBUG_KMS("vaddr = 0x%lx, paddr = 0x%lx\n",
 235                         (unsigned long)entry->vaddr,
 236                         (unsigned long)entry->paddr);
 237
 238         return entry;
 239 }
 240
 241 static struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 242         .fb_create = exynos_drm_fb_create,
 243 };
 244
 245 void exynos_drm_mode_config_init(struct drm_device *dev)
 246 {
 247         dev->mode_config.min_width = 0;
 248         dev->mode_config.min_height = 0;
 249
 250         /*
 251          * set max width and height as default value(4096x4096).
 252          * this value would be used to check framebuffer size limitation
 253          * at drm_mode_addfb().
 254          */
 255         dev->mode_config.max_width = 4096;
 256         dev->mode_config.max_height = 4096;
 257
 258         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 259 }
 260
 261 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 262 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 263 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 264 MODULE_DESCRIPTION("Samsung SoC DRM FB Driver");
 265 MODULE_LICENSE("GPL");