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