Merge tag 'driver-core-6.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / drivers / nvdimm / of_pmem.c
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 struct of_pmem_private {
13         struct nvdimm_bus_descriptor bus_desc;
14         struct nvdimm_bus *bus;
15 };
16
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 = kstrdup(pdev->name, GFP_KERNEL);
34         priv->bus_desc.module = THIS_MODULE;
35         priv->bus_desc.of_node = np;
36
37         priv->bus = bus = nvdimm_bus_register(&pdev->dev, &priv->bus_desc);
38         if (!bus) {
39                 kfree(priv);
40                 return -ENODEV;
41         }
42         platform_set_drvdata(pdev, priv);
43
44         is_volatile = !!of_find_property(np, "volatile", NULL);
45         dev_dbg(&pdev->dev, "Registering %s regions from %pOF\n",
46                         is_volatile ? "volatile" : "non-volatile",  np);
47
48         for (i = 0; i < pdev->num_resources; i++) {
49                 struct nd_region_desc ndr_desc;
50                 struct nd_region *region;
51
52                 /*
53                  * NB: libnvdimm copies the data from ndr_desc into it's own
54                  * structures so passing a stack pointer is fine.
55                  */
56                 memset(&ndr_desc, 0, sizeof(ndr_desc));
57                 ndr_desc.numa_node = dev_to_node(&pdev->dev);
58                 ndr_desc.target_node = ndr_desc.numa_node;
59                 ndr_desc.res = &pdev->resource[i];
60                 ndr_desc.of_node = np;
61                 set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
62
63                 if (is_volatile)
64                         region = nvdimm_volatile_region_create(bus, &ndr_desc);
65                 else {
66                         set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags);
67                         region = nvdimm_pmem_region_create(bus, &ndr_desc);
68                 }
69
70                 if (!region)
71                         dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n",
72                                         ndr_desc.res, np);
73                 else
74                         dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
75                                         ndr_desc.res, np);
76         }
77
78         return 0;
79 }
80
81 static int of_pmem_region_remove(struct platform_device *pdev)
82 {
83         struct of_pmem_private *priv = platform_get_drvdata(pdev);
84
85         nvdimm_bus_unregister(priv->bus);
86         kfree(priv);
87
88         return 0;
89 }
90
91 static const struct of_device_id of_pmem_region_match[] = {
92         { .compatible = "pmem-region" },
93         { .compatible = "pmem-region-v2" },
94         { },
95 };
96
97 static struct platform_driver of_pmem_region_driver = {
98         .probe = of_pmem_region_probe,
99         .remove = of_pmem_region_remove,
100         .driver = {
101                 .name = "of_pmem",
102                 .of_match_table = of_pmem_region_match,
103         },
104 };
105
106 module_platform_driver(of_pmem_region_driver);
107 MODULE_DEVICE_TABLE(of, of_pmem_region_match);
108 MODULE_LICENSE("GPL");
109 MODULE_AUTHOR("IBM Corporation");