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 struct komeda_dev *dev_to_mdev(struct device *dev)
  21 {
  22         struct komeda_drv *mdrv = dev_get_drvdata(dev);
  23
  24         return mdrv ? mdrv->mdev : NULL;
  25 }
  26
  27 static void komeda_unbind(struct device *dev)
  28 {
  29         struct komeda_drv *mdrv = dev_get_drvdata(dev);
  30
  31         if (!mdrv)
  32                 return;
  33
  34         komeda_kms_detach(mdrv->kms);
  35         komeda_dev_destroy(mdrv->mdev);
  36
  37         dev_set_drvdata(dev, NULL);
  38         devm_kfree(dev, mdrv);
  39 }
  40
  41 static int komeda_bind(struct device *dev)
  42 {
  43         struct komeda_drv *mdrv;
  44         int err;
  45
  46         mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
  47         if (!mdrv)
  48                 return -ENOMEM;
  49
  50         mdrv->mdev = komeda_dev_create(dev);
  51         if (IS_ERR(mdrv->mdev)) {
  52                 err = PTR_ERR(mdrv->mdev);
  53                 goto free_mdrv;
  54         }
  55
  56         mdrv->kms = komeda_kms_attach(mdrv->mdev);
  57         if (IS_ERR(mdrv->kms)) {
  58                 err = PTR_ERR(mdrv->kms);
  59                 goto destroy_mdev;
  60         }
  61
  62         dev_set_drvdata(dev, mdrv);
  63
  64         return 0;
  65
  66 destroy_mdev:
  67         komeda_dev_destroy(mdrv->mdev);
  68
  69 free_mdrv:
  70         devm_kfree(dev, mdrv);
  71         return err;
  72 }
  73
  74 static const struct component_master_ops komeda_master_ops = {
  75         .bind   = komeda_bind,
  76         .unbind = komeda_unbind,
  77 };
  78
  79 static int compare_of(struct device *dev, void *data)
  80 {
  81         return dev->of_node == data;
  82 }
  83
  84 static void komeda_add_slave(struct device *master,
  85                              struct component_match **match,
  86                              struct device_node *np, int port)
  87 {
  88         struct device_node *remote;
  89
  90         remote = of_graph_get_remote_node(np, port, 0);
  91         if (remote) {
  92                 drm_of_component_match_add(master, match, compare_of, remote);
  93                 of_node_put(remote);
  94         }
  95 }
  96
  97 static int komeda_platform_probe(struct platform_device *pdev)
  98 {
  99         struct device *dev = &pdev->dev;
 100         struct component_match *match = NULL;
 101         struct device_node *child;
 102
 103         if (!dev->of_node)
 104                 return -ENODEV;
 105
 106         for_each_available_child_of_node(dev->of_node, child) {
 107                 if (of_node_cmp(child->name, "pipeline") != 0)
 108                         continue;
 109
 110                 /* add connector */
 111                 komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT);
 112         }
 113
 114         return component_master_add_with_match(dev, &komeda_master_ops, match);
 115 }
 116
 117 static int komeda_platform_remove(struct platform_device *pdev)
 118 {
 119         component_master_del(&pdev->dev, &komeda_master_ops);
 120         return 0;
 121 }
 122
 123 static const struct komeda_product_data komeda_products[] = {
 124         [MALI_D71] = {
 125                 .product_id = MALIDP_D71_PRODUCT_ID,
 126                 .identify = d71_identify,
 127         },
 128 };
 129
 130 static const struct of_device_id komeda_of_match[] = {
 131         { .compatible = "arm,mali-d71", .data = &komeda_products[MALI_D71], },
 132         {},
 133 };
 134
 135 MODULE_DEVICE_TABLE(of, komeda_of_match);
 136
 137 static struct platform_driver komeda_platform_driver = {
 138         .probe  = komeda_platform_probe,
 139         .remove = komeda_platform_remove,
 140         .driver = {
 141                 .name = "komeda",
 142                 .of_match_table = komeda_of_match,
 143                 .pm = NULL,
 144         },
 145 };
 146
 147 module_platform_driver(komeda_platform_driver);
 148
 149 MODULE_AUTHOR("James.Qian.Wang <james.qian.wang@arm.com>");
 150 MODULE_DESCRIPTION("Komeda KMS driver");
 151 MODULE_LICENSE("GPL v2");