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 <drm/drmP.h>
  30 #include <drm/drm_crtc.h>
  31 #include <drm/drm_crtc_helper.h>
  32 #include <drm/drm_fb_helper.h>
  33
  34 #include "exynos_drm_drv.h"
  35 #include "exynos_drm_fb.h"
  36 #include "exynos_drm_gem.h"
  37
  38 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
  39
  40 /*
  41  * exynos specific framebuffer structure.
  42  *
  43  * @fb: drm framebuffer obejct.
  44  * @buf_cnt: a buffer count to drm framebuffer.
  45  * @exynos_gem_obj: array of exynos specific gem object containing a gem object.
  46  */
  47 struct exynos_drm_fb {
  48         struct drm_framebuffer          fb;
  49         unsigned int                    buf_cnt;
  50         struct exynos_drm_gem_obj       *exynos_gem_obj[MAX_FB_BUFFER];
  51 };
  52
  53 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
  54 {
  55         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  56         unsigned int i;
  57
  58         DRM_DEBUG_KMS("%s\n", __FILE__);
  59
  60         drm_framebuffer_cleanup(fb);
  61
  62         for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) {
  63                 struct drm_gem_object *obj;
  64
  65                 if (exynos_fb->exynos_gem_obj[i] == NULL)
  66                         continue;
  67
  68                 obj = &exynos_fb->exynos_gem_obj[i]->base;
  69                 drm_gem_object_unreference_unlocked(obj);
  70         }
  71
  72         kfree(exynos_fb);
  73         exynos_fb = NULL;
  74 }
  75
  76 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
  77                                         struct drm_file *file_priv,
  78                                         unsigned int *handle)
  79 {
  80         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  81
  82         DRM_DEBUG_KMS("%s\n", __FILE__);
  83
  84         return drm_gem_handle_create(file_priv,
  85                         &exynos_fb->exynos_gem_obj[0]->base, handle);
  86 }
  87
  88 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
  89                                 struct drm_file *file_priv, unsigned flags,
  90                                 unsigned color, struct drm_clip_rect *clips,
  91                                 unsigned num_clips)
  92 {
  93         DRM_DEBUG_KMS("%s\n", __FILE__);
  94
  95         /* TODO */
  96
  97         return 0;
  98 }
  99
 100 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 101         .destroy        = exynos_drm_fb_destroy,
 102         .create_handle  = exynos_drm_fb_create_handle,
 103         .dirty          = exynos_drm_fb_dirty,
 104 };
 105
 106 void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb,
 107                                                 unsigned int cnt)
 108 {
 109         struct exynos_drm_fb *exynos_fb;
 110
 111         exynos_fb = to_exynos_fb(fb);
 112
 113         exynos_fb->buf_cnt = cnt;
 114 }
 115
 116 unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
 117 {
 118         struct exynos_drm_fb *exynos_fb;
 119
 120         exynos_fb = to_exynos_fb(fb);
 121
 122         return exynos_fb->buf_cnt;
 123 }
 124
 125 struct drm_framebuffer *
 126 exynos_drm_framebuffer_init(struct drm_device *dev,
 127                             struct drm_mode_fb_cmd2 *mode_cmd,
 128                             struct drm_gem_object *obj)
 129 {
 130         struct exynos_drm_fb *exynos_fb;
 131         int ret;
 132
 133         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 134         if (!exynos_fb) {
 135                 DRM_ERROR("failed to allocate exynos drm framebuffer\n");
 136                 return ERR_PTR(-ENOMEM);
 137         }
 138
 139         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 140         if (ret) {
 141                 DRM_ERROR("failed to initialize framebuffer\n");
 142                 return ERR_PTR(ret);
 143         }
 144
 145         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 146         exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj);
 147
 148         return &exynos_fb->fb;
 149 }
 150
 151 static u32 exynos_drm_format_num_buffers(struct drm_mode_fb_cmd2 *mode_cmd)
 152 {
 153         unsigned int cnt = 0;
 154
 155         if (mode_cmd->pixel_format != DRM_FORMAT_NV12)
 156                 return drm_format_num_planes(mode_cmd->pixel_format);
 157
 158         while (cnt != MAX_FB_BUFFER) {
 159                 if (!mode_cmd->handles[cnt])
 160                         break;
 161                 cnt++;
 162         }
 163
 164         /*
 165          * check if NV12 or NV12M.
 166          *
 167          * NV12
 168          * handles[0] = base1, offsets[0] = 0
 169          * handles[1] = base1, offsets[1] = Y_size
 170          *
 171          * NV12M
 172          * handles[0] = base1, offsets[0] = 0
 173          * handles[1] = base2, offsets[1] = 0
 174          */
 175         if (cnt == 2) {
 176                 /*
 177                  * in case of NV12 format, offsets[1] is not 0 and
 178                  * handles[0] is same as handles[1].
 179                  */
 180                 if (mode_cmd->offsets[1] &&
 181                         mode_cmd->handles[0] == mode_cmd->handles[1])
 182                         cnt = 1;
 183         }
 184
 185         return cnt;
 186 }
 187
 188 static struct drm_framebuffer *
 189 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 190                       struct drm_mode_fb_cmd2 *mode_cmd)
 191 {
 192         struct drm_gem_object *obj;
 193         struct drm_framebuffer *fb;
 194         struct exynos_drm_fb *exynos_fb;
 195         int i;
 196
 197         DRM_DEBUG_KMS("%s\n", __FILE__);
 198
 199         obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
 200         if (!obj) {
 201                 DRM_ERROR("failed to lookup gem object\n");
 202                 return ERR_PTR(-ENOENT);
 203         }
 204
 205         fb = exynos_drm_framebuffer_init(dev, mode_cmd, obj);
 206         if (IS_ERR(fb)) {
 207                 drm_gem_object_unreference_unlocked(obj);
 208                 return fb;
 209         }
 210
 211         exynos_fb = to_exynos_fb(fb);
 212         exynos_fb->buf_cnt = exynos_drm_format_num_buffers(mode_cmd);
 213
 214         DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);
 215
 216         for (i = 1; i < exynos_fb->buf_cnt; i++) {
 217                 obj = drm_gem_object_lookup(dev, file_priv,
 218                                 mode_cmd->handles[i]);
 219                 if (!obj) {
 220                         DRM_ERROR("failed to lookup gem object\n");
 221                         exynos_drm_fb_destroy(fb);
 222                         return ERR_PTR(-ENOENT);
 223                 }
 224
 225                 exynos_fb->exynos_gem_obj[i] = to_exynos_gem_obj(obj);
 226         }
 227
 228         return fb;
 229 }
 230
 231 struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb,
 232                                                 int index)
 233 {
 234         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 235         struct exynos_drm_gem_buf *buffer;
 236
 237         DRM_DEBUG_KMS("%s\n", __FILE__);
 238
 239         if (index >= MAX_FB_BUFFER)
 240                 return NULL;
 241
 242         buffer = exynos_fb->exynos_gem_obj[index]->buffer;
 243         if (!buffer)
 244                 return NULL;
 245
 246         DRM_DEBUG_KMS("vaddr = 0x%lx, dma_addr = 0x%lx\n",
 247                         (unsigned long)buffer->kvaddr,
 248                         (unsigned long)buffer->dma_addr);
 249
 250         return buffer;
 251 }
 252
 253 static void exynos_drm_output_poll_changed(struct drm_device *dev)
 254 {
 255         struct exynos_drm_private *private = dev->dev_private;
 256         struct drm_fb_helper *fb_helper = private->fb_helper;
 257
 258         if (fb_helper)
 259                 drm_fb_helper_hotplug_event(fb_helper);
 260 }
 261
 262 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 263         .fb_create = exynos_user_fb_create,
 264         .output_poll_changed = exynos_drm_output_poll_changed,
 265 };
 266
 267 void exynos_drm_mode_config_init(struct drm_device *dev)
 268 {
 269         dev->mode_config.min_width = 0;
 270         dev->mode_config.min_height = 0;
 271
 272         /*
 273          * set max width and height as default value(4096x4096).
 274          * this value would be used to check framebuffer size limitation
 275          * at drm_mode_addfb().
 276          */
 277         dev->mode_config.max_width = 4096;
 278         dev->mode_config.max_height = 4096;
 279
 280         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 281 }