1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
2ec776ef6SChristoph Hellwig /*
3ec776ef6SChristoph Hellwig * Copyright (c) 2015, Christoph Hellwig.
49f53f9faSDan Williams * Copyright (c) 2015, Intel Corporation.
5ec776ef6SChristoph Hellwig */
6ec776ef6SChristoph Hellwig #include <linux/platform_device.h>
7186f4360SPaul Gortmaker #include <linux/init.h>
8bc0d0d09SDan Williams #include <linux/ioport.h>
9bc0d0d09SDan Williams
found(struct resource * res,void * data)101d2e733bSTom Lendacky static int found(struct resource *res, void *data)
11bc0d0d09SDan Williams {
12bc0d0d09SDan Williams return 1;
13bc0d0d09SDan Williams }
149f53f9faSDan Williams
register_e820_pmem(void)159f53f9faSDan Williams static __init int register_e820_pmem(void)
16ec776ef6SChristoph Hellwig {
177a67832cSDan Williams struct platform_device *pdev;
18bc0d0d09SDan Williams int rc;
19bc0d0d09SDan Williams
20f0f4711aSToshi Kani rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
21f0f4711aSToshi Kani IORESOURCE_MEM, 0, -1, NULL, found);
22bc0d0d09SDan Williams if (rc <= 0)
23bc0d0d09SDan Williams return 0;
249f53f9faSDan Williams
257a67832cSDan Williams /*
267a67832cSDan Williams * See drivers/nvdimm/e820.c for the implementation, this is
277a67832cSDan Williams * simply here to trigger the module to load on demand.
287a67832cSDan Williams */
297a67832cSDan Williams pdev = platform_device_alloc("e820_pmem", -1);
30*377a4c5cSJohan Hovold
31*377a4c5cSJohan Hovold rc = platform_device_add(pdev);
32*377a4c5cSJohan Hovold if (rc)
33*377a4c5cSJohan Hovold platform_device_put(pdev);
34*377a4c5cSJohan Hovold
35*377a4c5cSJohan Hovold return rc;
36ec776ef6SChristoph Hellwig }
379f53f9faSDan Williams device_initcall(register_e820_pmem);
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