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 #include "drm_fb_helper.h"
  33
  34 #include "exynos_drm_drv.h"
  35 #include "exynos_drm_fb.h"
  36 #include "exynos_drm_buf.h"
  37 #include "exynos_drm_gem.h"
  38
  39 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
  40
  41 /*
  42  * exynos specific framebuffer structure.
  43  *
  44  * @fb: drm framebuffer obejct.
  45  * @exynos_gem_obj: exynos specific gem object containing a gem object.
  46  * @buffer: pointer to exynos_drm_gem_buffer object.
  47  *      - contain the memory information to memory region allocated
  48  *      at default framebuffer creation.
  49  */
  50 struct exynos_drm_fb {
  51         struct drm_framebuffer          fb;
  52         struct exynos_drm_gem_obj       *exynos_gem_obj;
  53         struct exynos_drm_gem_buf       *buffer;
  54 };
  55
  56 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
  57 {
  58         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  59
  60         DRM_DEBUG_KMS("%s\n", __FILE__);
  61
  62         drm_framebuffer_cleanup(fb);
  63
  64         /*
  65          * default framebuffer has no gem object so
  66          * a buffer of the default framebuffer should be released at here.
  67          */
  68         if (!exynos_fb->exynos_gem_obj && exynos_fb->buffer)
  69                 exynos_drm_buf_destroy(fb->dev, exynos_fb->buffer);
  70
  71         kfree(exynos_fb);
  72         exynos_fb = NULL;
  73 }
  74
  75 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
  76                                         struct drm_file *file_priv,
  77                                         unsigned int *handle)
  78 {
  79         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  80
  81         DRM_DEBUG_KMS("%s\n", __FILE__);
  82
  83         return drm_gem_handle_create(file_priv,
  84                         &exynos_fb->exynos_gem_obj->base, handle);
  85 }
  86
  87 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
  88                                 struct drm_file *file_priv, unsigned flags,
  89                                 unsigned color, struct drm_clip_rect *clips,
  90                                 unsigned num_clips)
  91 {
  92         DRM_DEBUG_KMS("%s\n", __FILE__);
  93
  94         /* TODO */
  95
  96         return 0;
  97 }
  98
  99 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 100         .destroy        = exynos_drm_fb_destroy,
 101         .create_handle  = exynos_drm_fb_create_handle,
 102         .dirty          = exynos_drm_fb_dirty,
 103 };
 104
 105 static struct drm_framebuffer *
 106 exynos_drm_fb_init(struct drm_file *file_priv, struct drm_device *dev,
 107                     struct drm_mode_fb_cmd *mode_cmd)
 108 {
 109         struct exynos_drm_fb *exynos_fb;
 110         struct drm_framebuffer *fb;
 111         struct exynos_drm_gem_obj *exynos_gem_obj = NULL;
 112         struct drm_gem_object *obj;
 113         unsigned int size;
 114         int ret;
 115
 116         DRM_DEBUG_KMS("%s\n", __FILE__);
 117
 118         mode_cmd->pitch = max(mode_cmd->pitch,
 119                         mode_cmd->width * (mode_cmd->bpp >> 3));
 120
 121         DRM_LOG_KMS("drm fb create(%dx%d)\n",
 122                         mode_cmd->width, mode_cmd->height);
 123
 124         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 125         if (!exynos_fb) {
 126                 DRM_ERROR("failed to allocate exynos drm framebuffer.\n");
 127                 return ERR_PTR(-ENOMEM);
 128         }
 129
 130         fb = &exynos_fb->fb;
 131         ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
 132         if (ret) {
 133                 DRM_ERROR("failed to initialize framebuffer.\n");
 134                 goto err_init;
 135         }
 136
 137         DRM_LOG_KMS("create: fb id: %d\n", fb->base.id);
 138
 139         size = mode_cmd->pitch * mode_cmd->height;
 140
 141         /*
 142          * mode_cmd->handle could be NULL at booting time or
 143          * with user request. if NULL, a new buffer or a gem object
 144          * would be allocated.
 145          */
 146         if (!mode_cmd->handle) {
 147                 if (!file_priv) {
 148                         struct exynos_drm_gem_buf *buffer;
 149
 150                         /*
 151                          * in case that file_priv is NULL, it allocates
 152                          * only buffer and this buffer would be used
 153                          * for default framebuffer.
 154                          */
 155                         buffer = exynos_drm_buf_create(dev, size);
 156                         if (IS_ERR(buffer)) {
 157                                 ret = PTR_ERR(buffer);
 158                                 goto err_buffer;
 159                         }
 160
 161                         exynos_fb->buffer = buffer;
 162
 163                         DRM_LOG_KMS("default: dma_addr = 0x%lx, size = 0x%x\n",
 164                                         (unsigned long)buffer->dma_addr, size);
 165
 166                         goto out;
 167                 } else {
 168                         exynos_gem_obj = exynos_drm_gem_create(dev, file_priv,
 169                                                         &mode_cmd->handle,
 170                                                         size);
 171                         if (IS_ERR(exynos_gem_obj)) {
 172                                 ret = PTR_ERR(exynos_gem_obj);
 173                                 goto err_buffer;
 174                         }
 175                 }
 176         } else {
 177                 obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handle);
 178                 if (!obj) {
 179                         DRM_ERROR("failed to lookup gem object.\n");
 180                         goto err_buffer;
 181                 }
 182
 183                 exynos_gem_obj = to_exynos_gem_obj(obj);
 184
 185                 drm_gem_object_unreference_unlocked(obj);
 186         }
 187
 188         /*
 189          * if got a exynos_gem_obj from either a handle or
 190          * a new creation then exynos_fb->exynos_gem_obj is NULL
 191          * so that default framebuffer has no its own gem object,
 192          * only its own buffer object.
 193          */
 194         exynos_fb->buffer = exynos_gem_obj->buffer;
 195
 196         DRM_LOG_KMS("dma_addr = 0x%lx, size = 0x%x, gem object = 0x%x\n",
 197                         (unsigned long)exynos_fb->buffer->dma_addr, size,
 198                         (unsigned int)&exynos_gem_obj->base);
 199
 200 out:
 201         exynos_fb->exynos_gem_obj = exynos_gem_obj;
 202
 203         drm_helper_mode_fill_fb_struct(fb, mode_cmd);
 204
 205         return fb;
 206
 207 err_buffer:
 208         drm_framebuffer_cleanup(fb);
 209
 210 err_init:
 211         kfree(exynos_fb);
 212
 213         return ERR_PTR(ret);
 214 }
 215
 216 struct drm_framebuffer *exynos_drm_fb_create(struct drm_device *dev,
 217                                               struct drm_file *file_priv,
 218                                               struct drm_mode_fb_cmd *mode_cmd)
 219 {
 220         DRM_DEBUG_KMS("%s\n", __FILE__);
 221
 222         return exynos_drm_fb_init(file_priv, dev, mode_cmd);
 223 }
 224
 225 struct exynos_drm_gem_buf *exynos_drm_fb_get_buf(struct drm_framebuffer *fb)
 226 {
 227         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 228         struct exynos_drm_gem_buf *buffer;
 229
 230         DRM_DEBUG_KMS("%s\n", __FILE__);
 231
 232         buffer = exynos_fb->buffer;
 233         if (!buffer)
 234                 return NULL;
 235
 236         DRM_DEBUG_KMS("vaddr = 0x%lx, dma_addr = 0x%lx\n",
 237                         (unsigned long)buffer->kvaddr,
 238                         (unsigned long)buffer->dma_addr);
 239
 240         return buffer;
 241 }
 242
 243 static void exynos_drm_output_poll_changed(struct drm_device *dev)
 244 {
 245         struct exynos_drm_private *private = dev->dev_private;
 246         struct drm_fb_helper *fb_helper = private->fb_helper;
 247
 248         if (fb_helper)
 249                 drm_fb_helper_hotplug_event(fb_helper);
 250 }
 251
 252 static struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 253         .fb_create = exynos_drm_fb_create,
 254         .output_poll_changed = exynos_drm_output_poll_changed,
 255 };
 256
 257 void exynos_drm_mode_config_init(struct drm_device *dev)
 258 {
 259         dev->mode_config.min_width = 0;
 260         dev->mode_config.min_height = 0;
 261
 262         /*
 263          * set max width and height as default value(4096x4096).
 264          * this value would be used to check framebuffer size limitation
 265          * at drm_mode_addfb().
 266          */
 267         dev->mode_config.max_width = 4096;
 268         dev->mode_config.max_height = 4096;
 269
 270         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 271 }
 272
 273 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 274 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 275 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 276 MODULE_DESCRIPTION("Samsung SoC DRM FB Driver");
 277 MODULE_LICENSE("GPL");