drivers/gpu/drm/arm/display/komeda/komeda_drv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
   4  * Author: James.Qian.Wang <james.qian.wang@arm.com>
   5  *
   6  */
   7 #include <linux/module.h>
   8 #include <linux/kernel.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/component.h>
  11 #include <linux/pm_runtime.h>
  12 #include <drm/drm_of.h>
  13 #include "komeda_dev.h"
  14 #include "komeda_kms.h"
  15
  16 struct komeda_drv {
  17         struct komeda_dev *mdev;
  18         struct komeda_kms_dev *kms;
  19 };
  20
  21 struct komeda_dev *dev_to_mdev(struct device *dev)
  22 {
  23         struct komeda_drv *mdrv = dev_get_drvdata(dev);
  24
  25         return mdrv ? mdrv->mdev : NULL;
  26 }
  27
  28 static void komeda_unbind(struct device *dev)
  29 {
  30         struct komeda_drv *mdrv = dev_get_drvdata(dev);
  31
  32         if (!mdrv)
  33                 return;
  34
  35         komeda_kms_detach(mdrv->kms);
  36
  37         if (pm_runtime_enabled(dev))
  38                 pm_runtime_disable(dev);
  39         else
  40                 komeda_dev_suspend(mdrv->mdev);
  41
  42         komeda_dev_destroy(mdrv->mdev);
  43
  44         dev_set_drvdata(dev, NULL);
  45         devm_kfree(dev, mdrv);
  46 }
  47
  48 static int komeda_bind(struct device *dev)
  49 {
  50         struct komeda_drv *mdrv;
  51         int err;
  52
  53         mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
  54         if (!mdrv)
  55                 return -ENOMEM;
  56
  57         mdrv->mdev = komeda_dev_create(dev);
  58         if (IS_ERR(mdrv->mdev)) {
  59                 err = PTR_ERR(mdrv->mdev);
  60                 goto free_mdrv;
  61         }
  62
  63         pm_runtime_enable(dev);
  64         if (!pm_runtime_enabled(dev))
  65                 komeda_dev_resume(mdrv->mdev);
  66
  67         mdrv->kms = komeda_kms_attach(mdrv->mdev);
  68         if (IS_ERR(mdrv->kms)) {
  69                 err = PTR_ERR(mdrv->kms);
  70                 goto destroy_mdev;
  71         }
  72
  73         dev_set_drvdata(dev, mdrv);
  74
  75         return 0;
  76
  77 destroy_mdev:
  78         if (pm_runtime_enabled(dev))
  79                 pm_runtime_disable(dev);
  80         else
  81                 komeda_dev_suspend(mdrv->mdev);
  82
  83         komeda_dev_destroy(mdrv->mdev);
  84
  85 free_mdrv:
  86         devm_kfree(dev, mdrv);
  87         return err;
  88 }
  89
  90 static const struct component_master_ops komeda_master_ops = {
  91         .bind   = komeda_bind,
  92         .unbind = komeda_unbind,
  93 };
  94
  95 static int compare_of(struct device *dev, void *data)
  96 {
  97         return dev->of_node == data;
  98 }
  99
 100 static void komeda_add_slave(struct device *master,
 101                              struct component_match **match,
 102                              struct device_node *np,
 103                              u32 port, u32 endpoint)
 104 {
 105         struct device_node *remote;
 106
 107         remote = of_graph_get_remote_node(np, port, endpoint);
 108         if (remote) {
 109                 drm_of_component_match_add(master, match, compare_of, remote);
 110                 of_node_put(remote);
 111         }
 112 }
 113
 114 static int komeda_platform_probe(struct platform_device *pdev)
 115 {
 116         struct device *dev = &pdev->dev;
 117         struct component_match *match = NULL;
 118         struct device_node *child;
 119
 120         if (!dev->of_node)
 121                 return -ENODEV;
 122
 123         for_each_available_child_of_node(dev->of_node, child) {
 124                 if (of_node_cmp(child->name, "pipeline") != 0)
 125                         continue;
 126
 127                 /* add connector */
 128                 komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT, 0);
 129                 komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT, 1);
 130         }
 131
 132         return component_master_add_with_match(dev, &komeda_master_ops, match);
 133 }
 134
 135 static int komeda_platform_remove(struct platform_device *pdev)
 136 {
 137         component_master_del(&pdev->dev, &komeda_master_ops);
 138         return 0;
 139 }
 140
 141 static const struct of_device_id komeda_of_match[] = {
 142         { .compatible = "arm,mali-d71", .data = d71_identify, },
 143         { .compatible = "arm,mali-d32", .data = d71_identify, },
 144         {},
 145 };
 146
 147 MODULE_DEVICE_TABLE(of, komeda_of_match);
 148
 149 static int komeda_rt_pm_suspend(struct device *dev)
 150 {
 151         struct komeda_drv *mdrv = dev_get_drvdata(dev);
 152
 153         return komeda_dev_suspend(mdrv->mdev);
 154 }
 155
 156 static int komeda_rt_pm_resume(struct device *dev)
 157 {
 158         struct komeda_drv *mdrv = dev_get_drvdata(dev);
 159
 160         return komeda_dev_resume(mdrv->mdev);
 161 }
 162
 163 static int __maybe_unused komeda_pm_suspend(struct device *dev)
 164 {
 165         struct komeda_drv *mdrv = dev_get_drvdata(dev);
 166         int res;
 167
 168         res = drm_mode_config_helper_suspend(&mdrv->kms->base);
 169
 170         if (!pm_runtime_status_suspended(dev))
 171                 komeda_dev_suspend(mdrv->mdev);
 172
 173         return res;
 174 }
 175
 176 static int __maybe_unused komeda_pm_resume(struct device *dev)
 177 {
 178         struct komeda_drv *mdrv = dev_get_drvdata(dev);
 179
 180         if (!pm_runtime_status_suspended(dev))
 181                 komeda_dev_resume(mdrv->mdev);
 182
 183         return drm_mode_config_helper_resume(&mdrv->kms->base);
 184 }
 185
 186 static const struct dev_pm_ops komeda_pm_ops = {
 187         SET_SYSTEM_SLEEP_PM_OPS(komeda_pm_suspend, komeda_pm_resume)
 188         SET_RUNTIME_PM_OPS(komeda_rt_pm_suspend, komeda_rt_pm_resume, NULL)
 189 };
 190
 191 static struct platform_driver komeda_platform_driver = {
 192         .probe  = komeda_platform_probe,
 193         .remove = komeda_platform_remove,
 194         .driver = {
 195                 .name = "komeda",
 196                 .of_match_table = komeda_of_match,
 197                 .pm = &komeda_pm_ops,
 198         },
 199 };
 200
 201 module_platform_driver(komeda_platform_driver);
 202
 203 MODULE_AUTHOR("James.Qian.Wang <james.qian.wang@arm.com>");
 204 MODULE_DESCRIPTION("Komeda KMS driver");
 205 MODULE_LICENSE("GPL v2");