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
12 struct of_pmem_private {
13 struct nvdimm_bus_descriptor bus_desc;
14 struct nvdimm_bus *bus;
15 };
16
of_pmem_region_probe(struct platform_device * pdev)17 static 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(&pdev->dev);
26 if (!np)
27 return -ENXIO;
28
29 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
30 if (!priv)
31 return -ENOMEM;
32
33 priv->bus_desc.provider_name = devm_kstrdup(&pdev->dev, pdev->name,
34 GFP_KERNEL);
35 if (!priv->bus_desc.provider_name) {
36 kfree(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(&pdev->dev, &priv->bus_desc);
44 if (!bus) {
45 kfree(priv);
46 return -ENODEV;
47 }
48 platform_set_drvdata(pdev, priv);
49
50 is_volatile = of_property_read_bool(np, "volatile");
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(&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(ND_REGION_PAGEMAP, &ndr_desc.flags);
68
69 if (is_volatile)
70 region = nvdimm_volatile_region_create(bus, &ndr_desc);
71 else {
72 set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags);
73 region = nvdimm_pmem_region_create(bus, &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
of_pmem_region_remove(struct platform_device * pdev)87 static void of_pmem_region_remove(struct platform_device *pdev)
88 {
89 struct of_pmem_private *priv = platform_get_drvdata(pdev);
90
91 nvdimm_bus_unregister(priv->bus);
92 kfree(priv);
93 }
94
95 static const struct of_device_id of_pmem_region_match[] = {
96 { .compatible = "pmem-region" },
97 { .compatible = "pmem-region-v2" },
98 { },
99 };
100
101 static struct platform_driver of_pmem_region_driver = {
102 .probe = of_pmem_region_probe,
103 .remove = of_pmem_region_remove,
104 .driver = {
105 .name = "of_pmem",
106 .of_match_table = of_pmem_region_match,
107 },
108 };
109
110 module_platform_driver(of_pmem_region_driver);
111 MODULE_DEVICE_TABLE(of, of_pmem_region_match);
112 MODULE_DESCRIPTION("NVDIMM Device Tree support");
113 MODULE_LICENSE("GPL");
114 MODULE_AUTHOR("IBM Corporation");
115