1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/platform_device.h>
 3#include <linux/memregion.h>
 4#include <linux/module.h>
 5#include <linux/pfn_t.h>
 6#include "../bus.h"
 7
 8static bool region_idle;
 9module_param_named(region_idle, region_idle, bool, 0644);
10
11static int dax_hmem_probe(struct platform_device *pdev)
12{
13	struct device *dev = &pdev->dev;
14	struct dax_region *dax_region;
15	struct memregion_info *mri;
16	struct dev_dax_data data;
17	struct dev_dax *dev_dax;
18	struct resource *res;
19	struct range range;
20
21	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
22	if (!res)
23		return -ENOMEM;
24
25	mri = dev->platform_data;
26	range.start = res->start;
27	range.end = res->end;
28	dax_region = alloc_dax_region(dev, pdev->id, &range, mri->target_node,
29			PMD_SIZE, 0);
30	if (!dax_region)
31		return -ENOMEM;
32
33	data = (struct dev_dax_data) {
34		.dax_region = dax_region,
35		.id = -1,
36		.size = region_idle ? 0 : resource_size(res),
37	};
38	dev_dax = devm_create_dev_dax(&data);
39	if (IS_ERR(dev_dax))
40		return PTR_ERR(dev_dax);
41
42	/* child dev_dax instances now own the lifetime of the dax_region */
43	dax_region_put(dax_region);
44	return 0;
45}
46
47static int dax_hmem_remove(struct platform_device *pdev)
48{
49	/* devm handles teardown */
50	return 0;
51}
52
53static struct platform_driver dax_hmem_driver = {
54	.probe = dax_hmem_probe,
55	.remove = dax_hmem_remove,
56	.driver = {
57		.name = "hmem",
58	},
59};
60
61module_platform_driver(dax_hmem_driver);
62
63MODULE_ALIAS("platform:hmem*");
64MODULE_LICENSE("GPL v2");
65MODULE_AUTHOR("Intel Corporation");