drivers/gpu/drm/exynos/exynos_drm_core.c

   1 /* exynos_drm_core.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Author:
   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 "exynos_drm_drv.h"
  31 #include "exynos_drm_encoder.h"
  32 #include "exynos_drm_connector.h"
  33 #include "exynos_drm_fbdev.h"
  34
  35 static LIST_HEAD(exynos_drm_subdrv_list);
  36
  37 static int exynos_drm_create_enc_conn(struct drm_device *dev,
  38                                         struct exynos_drm_subdrv *subdrv)
  39 {
  40         struct drm_encoder *encoder;
  41         struct drm_connector *connector;
  42         int ret;
  43
  44         DRM_DEBUG_DRIVER("%s\n", __FILE__);
  45
  46         subdrv->manager->dev = subdrv->dev;
  47
  48         /* create and initialize a encoder for this sub driver. */
  49         encoder = exynos_drm_encoder_create(dev, subdrv->manager,
  50                         (1 << MAX_CRTC) - 1);
  51         if (!encoder) {
  52                 DRM_ERROR("failed to create encoder\n");
  53                 return -EFAULT;
  54         }
  55
  56         /*
  57          * create and initialize a connector for this sub driver and
  58          * attach the encoder created above to the connector.
  59          */
  60         connector = exynos_drm_connector_create(dev, encoder);
  61         if (!connector) {
  62                 DRM_ERROR("failed to create connector\n");
  63                 ret = -EFAULT;
  64                 goto err_destroy_encoder;
  65         }
  66
  67         subdrv->encoder = encoder;
  68         subdrv->connector = connector;
  69
  70         return 0;
  71
  72 err_destroy_encoder:
  73         encoder->funcs->destroy(encoder);
  74         return ret;
  75 }
  76
  77 static void exynos_drm_destroy_enc_conn(struct exynos_drm_subdrv *subdrv)
  78 {
  79         if (subdrv->encoder) {
  80                 struct drm_encoder *encoder = subdrv->encoder;
  81                 encoder->funcs->destroy(encoder);
  82                 subdrv->encoder = NULL;
  83         }
  84
  85         if (subdrv->connector) {
  86                 struct drm_connector *connector = subdrv->connector;
  87                 connector->funcs->destroy(connector);
  88                 subdrv->connector = NULL;
  89         }
  90 }
  91
  92 static int exynos_drm_subdrv_probe(struct drm_device *dev,
  93                                         struct exynos_drm_subdrv *subdrv)
  94 {
  95         if (subdrv->probe) {
  96                 int ret;
  97
  98                 subdrv->drm_dev = dev;
  99
 100                 /*
 101                  * this probe callback would be called by sub driver
 102                  * after setting of all resources to this sub driver,
 103                  * such as clock, irq and register map are done or by load()
 104                  * of exynos drm driver.
 105                  *
 106                  * P.S. note that this driver is considered for modularization.
 107                  */
 108                 ret = subdrv->probe(dev, subdrv->dev);
 109                 if (ret)
 110                         return ret;
 111         }
 112
 113         return 0;
 114 }
 115
 116 static void exynos_drm_subdrv_remove(struct drm_device *dev,
 117                                       struct exynos_drm_subdrv *subdrv)
 118 {
 119         DRM_DEBUG_DRIVER("%s\n", __FILE__);
 120
 121         if (subdrv->remove)
 122                 subdrv->remove(dev, subdrv->dev);
 123 }
 124
 125 int exynos_drm_device_register(struct drm_device *dev)
 126 {
 127         struct exynos_drm_subdrv *subdrv, *n;
 128         unsigned int fine_cnt = 0;
 129         int err;
 130
 131         DRM_DEBUG_DRIVER("%s\n", __FILE__);
 132
 133         if (!dev)
 134                 return -EINVAL;
 135
 136         list_for_each_entry_safe(subdrv, n, &exynos_drm_subdrv_list, list) {
 137                 err = exynos_drm_subdrv_probe(dev, subdrv);
 138                 if (err) {
 139                         DRM_DEBUG("exynos drm subdrv probe failed.\n");
 140                         list_del(&subdrv->list);
 141                         continue;
 142                 }
 143
 144                 /*
 145                  * if manager is null then it means that this sub driver
 146                  * doesn't need encoder and connector.
 147                  */
 148                 if (!subdrv->manager) {
 149                         fine_cnt++;
 150                         continue;
 151                 }
 152
 153                 err = exynos_drm_create_enc_conn(dev, subdrv);
 154                 if (err) {
 155                         DRM_DEBUG("failed to create encoder and connector.\n");
 156                         exynos_drm_subdrv_remove(dev, subdrv);
 157                         list_del(&subdrv->list);
 158                         continue;
 159                 }
 160
 161                 fine_cnt++;
 162         }
 163
 164         if (!fine_cnt)
 165                 return -EINVAL;
 166
 167         return 0;
 168 }
 169 EXPORT_SYMBOL_GPL(exynos_drm_device_register);
 170
 171 int exynos_drm_device_unregister(struct drm_device *dev)
 172 {
 173         struct exynos_drm_subdrv *subdrv;
 174
 175         DRM_DEBUG_DRIVER("%s\n", __FILE__);
 176
 177         if (!dev) {
 178                 WARN(1, "Unexpected drm device unregister!\n");
 179                 return -EINVAL;
 180         }
 181
 182         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
 183                 exynos_drm_subdrv_remove(dev, subdrv);
 184                 exynos_drm_destroy_enc_conn(subdrv);
 185         }
 186
 187         return 0;
 188 }
 189 EXPORT_SYMBOL_GPL(exynos_drm_device_unregister);
 190
 191 int exynos_drm_subdrv_register(struct exynos_drm_subdrv *subdrv)
 192 {
 193         DRM_DEBUG_DRIVER("%s\n", __FILE__);
 194
 195         if (!subdrv)
 196                 return -EINVAL;
 197
 198         list_add_tail(&subdrv->list, &exynos_drm_subdrv_list);
 199
 200         return 0;
 201 }
 202 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_register);
 203
 204 int exynos_drm_subdrv_unregister(struct exynos_drm_subdrv *subdrv)
 205 {
 206         DRM_DEBUG_DRIVER("%s\n", __FILE__);
 207
 208         if (!subdrv)
 209                 return -EINVAL;
 210
 211         list_del(&subdrv->list);
 212
 213         return 0;
 214 }
 215 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_unregister);
 216
 217 int exynos_drm_subdrv_open(struct drm_device *dev, struct drm_file *file)
 218 {
 219         struct exynos_drm_subdrv *subdrv;
 220         int ret;
 221
 222         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
 223                 if (subdrv->open) {
 224                         ret = subdrv->open(dev, subdrv->dev, file);
 225                         if (ret)
 226                                 goto err;
 227                 }
 228         }
 229
 230         return 0;
 231
 232 err:
 233         list_for_each_entry_reverse(subdrv, &subdrv->list, list) {
 234                 if (subdrv->close)
 235                         subdrv->close(dev, subdrv->dev, file);
 236         }
 237         return ret;
 238 }
 239 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_open);
 240
 241 void exynos_drm_subdrv_close(struct drm_device *dev, struct drm_file *file)
 242 {
 243         struct exynos_drm_subdrv *subdrv;
 244
 245         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
 246                 if (subdrv->close)
 247                         subdrv->close(dev, subdrv->dev, file);
 248         }
 249 }
 250 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_close);