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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(&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_find_property(np, "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(&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
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(priv->bus);
92 kfree(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");
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
12static const struct attribute_group *region_attr_groups[] = {
13 &nd_region_attribute_group,
14 &nd_device_attribute_group,
15 NULL,
16};
17
18static const struct attribute_group *bus_attr_groups[] = {
19 &nvdimm_bus_attribute_group,
20 NULL,
21};
22
23struct of_pmem_private {
24 struct nvdimm_bus_descriptor bus_desc;
25 struct nvdimm_bus *bus;
26};
27
28static 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
91static 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
101static const struct of_device_id of_pmem_region_match[] = {
102 { .compatible = "pmem-region" },
103 { },
104};
105
106static 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
116module_platform_driver(of_pmem_region_driver);
117MODULE_DEVICE_TABLE(of, of_pmem_region_match);
118MODULE_LICENSE("GPL");
119MODULE_AUTHOR("IBM Corporation");