1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2015, Christoph Hellwig.
4 * Copyright (c) 2015, Intel Corporation.
5 */
6#include <linux/platform_device.h>
7#include <linux/init.h>
8#include <linux/ioport.h>
9
10static int found(struct resource *res, void *data)
11{
12	return 1;
13}
14
15static __init int register_e820_pmem(void)
16{
17	struct platform_device *pdev;
18	int rc;
19
20	rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
21				 IORESOURCE_MEM, 0, -1, NULL, found);
22	if (rc <= 0)
23		return 0;
24
25	/*
26	 * See drivers/nvdimm/e820.c for the implementation, this is
27	 * simply here to trigger the module to load on demand.
28	 */
29	pdev = platform_device_alloc("e820_pmem", -1);
30
31	rc = platform_device_add(pdev);
32	if (rc)
33		platform_device_put(pdev);
34
35	return rc;
36}
37device_initcall(register_e820_pmem);
38