drivers/firmware/google/coreboot_table-of.c

   1 /*
   2  * coreboot_table-of.c
   3  *
   4  * Coreboot table access through open firmware.
   5  *
   6  * Copyright 2017 Google Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License v2.0 as published by
  10  * the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/io.h>
  20 #include <linux/module.h>
  21 #include <linux/of_address.h>
  22 #include <linux/platform_device.h>
  23
  24 #include "coreboot_table.h"
  25
  26 static int coreboot_table_of_probe(struct platform_device *pdev)
  27 {
  28         struct device_node *fw_dn = pdev->dev.of_node;
  29         void __iomem *ptr;
  30
  31         ptr = of_iomap(fw_dn, 0);
  32         if (!ptr)
  33                 return -ENOMEM;
  34
  35         return coreboot_table_init(&pdev->dev, ptr);
  36 }
  37
  38 static int coreboot_table_of_remove(struct platform_device *pdev)
  39 {
  40         return coreboot_table_exit();
  41 }
  42
  43 static const struct of_device_id coreboot_of_match[] = {
  44         { .compatible = "coreboot" },
  45         {}
  46 };
  47 MODULE_DEVICE_TABLE(of, coreboot_of_match);
  48
  49 static struct platform_driver coreboot_table_of_driver = {
  50         .probe = coreboot_table_of_probe,
  51         .remove = coreboot_table_of_remove,
  52         .driver = {
  53                 .name = "coreboot_table_of",
  54                 .of_match_table = coreboot_of_match,
  55         },
  56 };
  57 module_platform_driver(coreboot_table_of_driver);
  58
  59 MODULE_AUTHOR("Google, Inc.");
  60 MODULE_LICENSE("GPL");