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
found(struct resource * res,void * data)10 static int found(struct resource *res, void *data)
11 {
12 return 1;
13 }
14
register_e820_pmem(void)15 static __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 }
37 device_initcall(register_e820_pmem);
38