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 <drm/drm_of.h>
  12 #include "komeda_dev.h"
  13 #include "komeda_kms.h"
  14
  15 struct komeda_drv {
  16         struct komeda_dev *mdev;
  17         struct komeda_kms_dev *kms;
  18 };
  19
  20 static void komeda_unbind(struct device *dev)
  21 {
  22         struct komeda_drv *mdrv = dev_get_drvdata(dev);
  23
  24         if (!mdrv)
  25                 return;
  26
  27         komeda_kms_detach(mdrv->kms);
  28         komeda_dev_destroy(mdrv->mdev);
  29
  30         dev_set_drvdata(dev, NULL);
  31         devm_kfree(dev, mdrv);
  32 }
  33
  34 static int komeda_bind(struct device *dev)
  35 {
  36         struct komeda_drv *mdrv;
  37         int err;
  38
  39         mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
  40         if (!mdrv)
  41                 return -ENOMEM;
  42
  43         mdrv->mdev = komeda_dev_create(dev);
  44         if (IS_ERR(mdrv->mdev)) {
  45                 err = PTR_ERR(mdrv->mdev);
  46                 goto free_mdrv;
  47         }
  48
  49         mdrv->kms = komeda_kms_attach(mdrv->mdev);
  50         if (IS_ERR(mdrv->kms)) {
  51                 err = PTR_ERR(mdrv->kms);
  52                 goto destroy_mdev;
  53         }
  54
  55         dev_set_drvdata(dev, mdrv);
  56
  57         return 0;
  58
  59 destroy_mdev:
  60         komeda_dev_destroy(mdrv->mdev);
  61
  62 free_mdrv:
  63         devm_kfree(dev, mdrv);
  64         return err;
  65 }
  66
  67 static const struct component_master_ops komeda_master_ops = {
  68         .bind   = komeda_bind,
  69         .unbind = komeda_unbind,
  70 };
  71
  72 static int compare_of(struct device *dev, void *data)
  73 {
  74         return dev->of_node == data;
  75 }
  76
  77 static void komeda_add_slave(struct device *master,
  78                              struct component_match **match,
  79                              struct device_node *np, int port)
  80 {
  81         struct device_node *remote;
  82
  83         remote = of_graph_get_remote_node(np, port, 0);
  84         if (remote) {
  85                 drm_of_component_match_add(master, match, compare_of, remote);
  86                 of_node_put(remote);
  87         }
  88 }
  89
  90 static int komeda_platform_probe(struct platform_device *pdev)
  91 {
  92         struct device *dev = &pdev->dev;
  93         struct component_match *match = NULL;
  94         struct device_node *child;
  95
  96         if (!dev->of_node)
  97                 return -ENODEV;
  98
  99         for_each_available_child_of_node(dev->of_node, child) {
 100                 if (of_node_cmp(child->name, "pipeline") != 0)
 101                         continue;
 102
 103                 /* add connector */
 104                 komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT);
 105         }
 106
 107         return component_master_add_with_match(dev, &komeda_master_ops, match);
 108 }
 109
 110 static int komeda_platform_remove(struct platform_device *pdev)
 111 {
 112         component_master_del(&pdev->dev, &komeda_master_ops);
 113         return 0;
 114 }
 115
 116 static const struct komeda_product_data komeda_products[] = {
 117         [MALI_D71] = {
 118                 .product_id = MALIDP_D71_PRODUCT_ID,
 119                 .identify = d71_identify,
 120         },
 121 };
 122
 123 const struct of_device_id komeda_of_match[] = {
 124         { .compatible = "arm,mali-d71", .data = &komeda_products[MALI_D71], },
 125         {},
 126 };
 127
 128 MODULE_DEVICE_TABLE(of, komeda_of_match);
 129
 130 static struct platform_driver komeda_platform_driver = {
 131         .probe  = komeda_platform_probe,
 132         .remove = komeda_platform_remove,
 133         .driver = {
 134                 .name = "komeda",
 135                 .of_match_table = komeda_of_match,
 136                 .pm = NULL,
 137         },
 138 };
 139
 140 module_platform_driver(komeda_platform_driver);
 141
 142 MODULE_AUTHOR("James.Qian.Wang <james.qian.wang@arm.com>");
 143 MODULE_DESCRIPTION("Komeda KMS driver");
 144 MODULE_LICENSE("GPL v2");