1// SPDX-License-Identifier: GPL-2.0+
2
3#define pr_fmt(fmt) "of_pmem: " fmt
4
5#include <linux/of.h>
6#include <linux/libnvdimm.h>
7#include <linux/module.h>
8#include <linux/ioport.h>
9#include <linux/platform_device.h>
10#include <linux/slab.h>
11
12struct of_pmem_private {
13 struct nvdimm_bus_descriptor bus_desc;
14 struct nvdimm_bus *bus;
15};
16
17static int of_pmem_region_probe(struct platform_device *pdev)
18{
19 struct of_pmem_private *priv;
20 struct device_node *np;
21 struct nvdimm_bus *bus;
22 bool is_volatile;
23 int i;
24
25 np = dev_of_node(dev: &pdev->dev);
26 if (!np)
27 return -ENXIO;
28
29 priv = kzalloc(size: sizeof(*priv), GFP_KERNEL);
30 if (!priv)
31 return -ENOMEM;
32
33 priv->bus_desc.provider_name = devm_kstrdup(dev: &pdev->dev, s: pdev->name,
34 GFP_KERNEL);
35 if (!priv->bus_desc.provider_name) {
36 kfree(objp: priv);
37 return -ENOMEM;
38 }
39
40 priv->bus_desc.module = THIS_MODULE;
41 priv->bus_desc.of_node = np;
42
43 priv->bus = bus = nvdimm_bus_register(parent: &pdev->dev, nfit_desc: &priv->bus_desc);
44 if (!bus) {
45 kfree(objp: priv);
46 return -ENODEV;
47 }
48 platform_set_drvdata(pdev, data: priv);
49
50 is_volatile = !!of_find_property(np, name: "volatile", NULL);
51 dev_dbg(&pdev->dev, "Registering %s regions from %pOF\n",
52 is_volatile ? "volatile" : "non-volatile", np);
53
54 for (i = 0; i < pdev->num_resources; i++) {
55 struct nd_region_desc ndr_desc;
56 struct nd_region *region;
57
58 /*
59 * NB: libnvdimm copies the data from ndr_desc into it's own
60 * structures so passing a stack pointer is fine.
61 */
62 memset(&ndr_desc, 0, sizeof(ndr_desc));
63 ndr_desc.numa_node = dev_to_node(dev: &pdev->dev);
64 ndr_desc.target_node = ndr_desc.numa_node;
65 ndr_desc.res = &pdev->resource[i];
66 ndr_desc.of_node = np;
67 set_bit(nr: ND_REGION_PAGEMAP, addr: &ndr_desc.flags);
68
69 if (is_volatile)
70 region = nvdimm_volatile_region_create(nvdimm_bus: bus, ndr_desc: &ndr_desc);
71 else {
72 set_bit(nr: ND_REGION_PERSIST_MEMCTRL, addr: &ndr_desc.flags);
73 region = nvdimm_pmem_region_create(nvdimm_bus: bus, ndr_desc: &ndr_desc);
74 }
75
76 if (!region)
77 dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n",
78 ndr_desc.res, np);
79 else
80 dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
81 ndr_desc.res, np);
82 }
83
84 return 0;
85}
86
87static int of_pmem_region_remove(struct platform_device *pdev)
88{
89 struct of_pmem_private *priv = platform_get_drvdata(pdev);
90
91 nvdimm_bus_unregister(nvdimm_bus: priv->bus);
92 kfree(objp: priv);
93
94 return 0;
95}
96
97static const struct of_device_id of_pmem_region_match[] = {
98 { .compatible = "pmem-region" },
99 { .compatible = "pmem-region-v2" },
100 { },
101};
102
103static struct platform_driver of_pmem_region_driver = {
104 .probe = of_pmem_region_probe,
105 .remove = of_pmem_region_remove,
106 .driver = {
107 .name = "of_pmem",
108 .of_match_table = of_pmem_region_match,
109 },
110};
111
112module_platform_driver(of_pmem_region_driver);
113MODULE_DEVICE_TABLE(of, of_pmem_region_match);
114MODULE_LICENSE("GPL");
115MODULE_AUTHOR("IBM Corporation");
116

source code of linux/drivers/nvdimm/of_pmem.c