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  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include "exynos_drm_drv.h"
  17 #include "exynos_drm_encoder.h"
  18 #include "exynos_drm_connector.h"
  19 #include "exynos_drm_fbdev.h"
  20
  21 static LIST_HEAD(exynos_drm_subdrv_list);
  22
  23 static int exynos_drm_create_enc_conn(struct drm_device *dev,
  24                                         struct exynos_drm_subdrv *subdrv)
  25 {
  26         struct drm_encoder *encoder;
  27         struct drm_connector *connector;
  28         int ret;
  29
  30         DRM_DEBUG_DRIVER("%s\n", __FILE__);
  31
  32         subdrv->manager->dev = subdrv->dev;
  33
  34         /* create and initialize a encoder for this sub driver. */
  35         encoder = exynos_drm_encoder_create(dev, subdrv->manager,
  36                         (1 << MAX_CRTC) - 1);
  37         if (!encoder) {
  38                 DRM_ERROR("failed to create encoder\n");
  39                 return -EFAULT;
  40         }
  41
  42         /*
  43          * create and initialize a connector for this sub driver and
  44          * attach the encoder created above to the connector.
  45          */
  46         connector = exynos_drm_connector_create(dev, encoder);
  47         if (!connector) {
  48                 DRM_ERROR("failed to create connector\n");
  49                 ret = -EFAULT;
  50                 goto err_destroy_encoder;
  51         }
  52
  53         subdrv->encoder = encoder;
  54         subdrv->connector = connector;
  55
  56         return 0;
  57
  58 err_destroy_encoder:
  59         encoder->funcs->destroy(encoder);
  60         return ret;
  61 }
  62
  63 static void exynos_drm_destroy_enc_conn(struct exynos_drm_subdrv *subdrv)
  64 {
  65         if (subdrv->encoder) {
  66                 struct drm_encoder *encoder = subdrv->encoder;
  67                 encoder->funcs->destroy(encoder);
  68                 subdrv->encoder = NULL;
  69         }
  70
  71         if (subdrv->connector) {
  72                 struct drm_connector *connector = subdrv->connector;
  73                 connector->funcs->destroy(connector);
  74                 subdrv->connector = NULL;
  75         }
  76 }
  77
  78 static int exynos_drm_subdrv_probe(struct drm_device *dev,
  79                                         struct exynos_drm_subdrv *subdrv)
  80 {
  81         if (subdrv->probe) {
  82                 int ret;
  83
  84                 subdrv->drm_dev = dev;
  85
  86                 /*
  87                  * this probe callback would be called by sub driver
  88                  * after setting of all resources to this sub driver,
  89                  * such as clock, irq and register map are done or by load()
  90                  * of exynos drm driver.
  91                  *
  92                  * P.S. note that this driver is considered for modularization.
  93                  */
  94                 ret = subdrv->probe(dev, subdrv->dev);
  95                 if (ret)
  96                         return ret;
  97         }
  98
  99         return 0;
 100 }
 101
 102 static void exynos_drm_subdrv_remove(struct drm_device *dev,
 103                                       struct exynos_drm_subdrv *subdrv)
 104 {
 105         DRM_DEBUG_DRIVER("%s\n", __FILE__);
 106
 107         if (subdrv->remove)
 108                 subdrv->remove(dev, subdrv->dev);
 109 }
 110
 111 int exynos_drm_device_register(struct drm_device *dev)
 112 {
 113         struct exynos_drm_subdrv *subdrv, *n;
 114         unsigned int fine_cnt = 0;
 115         int err;
 116
 117         DRM_DEBUG_DRIVER("%s\n", __FILE__);
 118
 119         if (!dev)
 120                 return -EINVAL;
 121
 122         list_for_each_entry_safe(subdrv, n, &exynos_drm_subdrv_list, list) {
 123                 err = exynos_drm_subdrv_probe(dev, subdrv);
 124                 if (err) {
 125                         DRM_DEBUG("exynos drm subdrv probe failed.\n");
 126                         list_del(&subdrv->list);
 127                         continue;
 128                 }
 129
 130                 /*
 131                  * if manager is null then it means that this sub driver
 132                  * doesn't need encoder and connector.
 133                  */
 134                 if (!subdrv->manager) {
 135                         fine_cnt++;
 136                         continue;
 137                 }
 138
 139                 err = exynos_drm_create_enc_conn(dev, subdrv);
 140                 if (err) {
 141                         DRM_DEBUG("failed to create encoder and connector.\n");
 142                         exynos_drm_subdrv_remove(dev, subdrv);
 143                         list_del(&subdrv->list);
 144                         continue;
 145                 }
 146
 147                 fine_cnt++;
 148         }
 149
 150         if (!fine_cnt)
 151                 return -EINVAL;
 152
 153         return 0;
 154 }
 155 EXPORT_SYMBOL_GPL(exynos_drm_device_register);
 156
 157 int exynos_drm_device_unregister(struct drm_device *dev)
 158 {
 159         struct exynos_drm_subdrv *subdrv;
 160
 161         DRM_DEBUG_DRIVER("%s\n", __FILE__);
 162
 163         if (!dev) {
 164                 WARN(1, "Unexpected drm device unregister!\n");
 165                 return -EINVAL;
 166         }
 167
 168         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
 169                 exynos_drm_subdrv_remove(dev, subdrv);
 170                 exynos_drm_destroy_enc_conn(subdrv);
 171         }
 172
 173         return 0;
 174 }
 175 EXPORT_SYMBOL_GPL(exynos_drm_device_unregister);
 176
 177 int exynos_drm_subdrv_register(struct exynos_drm_subdrv *subdrv)
 178 {
 179         DRM_DEBUG_DRIVER("%s\n", __FILE__);
 180
 181         if (!subdrv)
 182                 return -EINVAL;
 183
 184         list_add_tail(&subdrv->list, &exynos_drm_subdrv_list);
 185
 186         return 0;
 187 }
 188 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_register);
 189
 190 int exynos_drm_subdrv_unregister(struct exynos_drm_subdrv *subdrv)
 191 {
 192         DRM_DEBUG_DRIVER("%s\n", __FILE__);
 193
 194         if (!subdrv)
 195                 return -EINVAL;
 196
 197         list_del(&subdrv->list);
 198
 199         return 0;
 200 }
 201 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_unregister);
 202
 203 int exynos_drm_subdrv_open(struct drm_device *dev, struct drm_file *file)
 204 {
 205         struct exynos_drm_subdrv *subdrv;
 206         int ret;
 207
 208         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
 209                 if (subdrv->open) {
 210                         ret = subdrv->open(dev, subdrv->dev, file);
 211                         if (ret)
 212                                 goto err;
 213                 }
 214         }
 215
 216         return 0;
 217
 218 err:
 219         list_for_each_entry_reverse(subdrv, &subdrv->list, list) {
 220                 if (subdrv->close)
 221                         subdrv->close(dev, subdrv->dev, file);
 222         }
 223         return ret;
 224 }
 225 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_open);
 226
 227 void exynos_drm_subdrv_close(struct drm_device *dev, struct drm_file *file)
 228 {
 229         struct exynos_drm_subdrv *subdrv;
 230
 231         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
 232                 if (subdrv->close)
 233                         subdrv->close(dev, subdrv->dev, file);
 234         }
 235 }
 236 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_close);