1 // SPDX-License-Identifier: GPL-2.0+
2
3 #define pr_fmt(fmt) "of_pmem: " fmt
4
5 #include <linux/of_platform.h>
6 #include <linux/of_address.h>
7 #include <linux/libnvdimm.h>
8 #include <linux/module.h>
9 #include <linux/ioport.h>
10 #include <linux/slab.h>
11
12 static const struct attribute_group *region_attr_groups[] = {
13 &nd_region_attribute_group,
14 &nd_device_attribute_group,
15 NULL,
16 };
17
18 static const struct attribute_group *bus_attr_groups[] = {
19 &nvdimm_bus_attribute_group,
20 NULL,
21 };
22
23 struct of_pmem_private {
24 struct nvdimm_bus_descriptor bus_desc;
25 struct nvdimm_bus *bus;
26 };
27
of_pmem_region_probe(struct platform_device * pdev)28 static int of_pmem_region_probe(struct platform_device *pdev)
29 {
30 struct of_pmem_private *priv;
31 struct device_node *np;
32 struct nvdimm_bus *bus;
33 bool is_volatile;
34 int i;
35
36 np = dev_of_node(&pdev->dev);
37 if (!np)
38 return -ENXIO;
39
40 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
41 if (!priv)
42 return -ENOMEM;
43
44 priv->bus_desc.attr_groups = bus_attr_groups;
45 priv->bus_desc.provider_name = "of_pmem";
46 priv->bus_desc.module = THIS_MODULE;
47 priv->bus_desc.of_node = np;
48
49 priv->bus = bus = nvdimm_bus_register(&pdev->dev, &priv->bus_desc);
50 if (!bus) {
51 kfree(priv);
52 return -ENODEV;
53 }
54 platform_set_drvdata(pdev, priv);
55
56 is_volatile = !!of_find_property(np, "volatile", NULL);
57 dev_dbg(&pdev->dev, "Registering %s regions from %pOF\n",
58 is_volatile ? "volatile" : "non-volatile", np);
59
60 for (i = 0; i < pdev->num_resources; i++) {
61 struct nd_region_desc ndr_desc;
62 struct nd_region *region;
63
64 /*
65 * NB: libnvdimm copies the data from ndr_desc into it's own
66 * structures so passing a stack pointer is fine.
67 */
68 memset(&ndr_desc, 0, sizeof(ndr_desc));
69 ndr_desc.attr_groups = region_attr_groups;
70 ndr_desc.numa_node = dev_to_node(&pdev->dev);
71 ndr_desc.res = &pdev->resource[i];
72 ndr_desc.of_node = np;
73 set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
74
75 if (is_volatile)
76 region = nvdimm_volatile_region_create(bus, &ndr_desc);
77 else
78 region = nvdimm_pmem_region_create(bus, &ndr_desc);
79
80 if (!region)
81 dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n",
82 ndr_desc.res, np);
83 else
84 dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
85 ndr_desc.res, np);
86 }
87
88 return 0;
89 }
90
of_pmem_region_remove(struct platform_device * pdev)91 static int of_pmem_region_remove(struct platform_device *pdev)
92 {
93 struct of_pmem_private *priv = platform_get_drvdata(pdev);
94
95 nvdimm_bus_unregister(priv->bus);
96 kfree(priv);
97
98 return 0;
99 }
100
101 static const struct of_device_id of_pmem_region_match[] = {
102 { .compatible = "pmem-region" },
103 { },
104 };
105
106 static struct platform_driver of_pmem_region_driver = {
107 .probe = of_pmem_region_probe,
108 .remove = of_pmem_region_remove,
109 .driver = {
110 .name = "of_pmem",
111 .owner = THIS_MODULE,
112 .of_match_table = of_pmem_region_match,
113 },
114 };
115
116 module_platform_driver(of_pmem_region_driver);
117 MODULE_DEVICE_TABLE(of, of_pmem_region_match);
118 MODULE_LICENSE("GPL");
119 MODULE_AUTHOR("IBM Corporation");
120
