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71719760 OH |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | ||
3 | #define pr_fmt(fmt) "of_pmem: " fmt | |
4 | ||
fd774e36 | 5 | #include <linux/of.h> |
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6 | #include <linux/libnvdimm.h> |
7 | #include <linux/module.h> | |
8 | #include <linux/ioport.h> | |
fd774e36 | 9 | #include <linux/platform_device.h> |
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10 | #include <linux/slab.h> |
11 | ||
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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 | ||
49bddc73 | 33 | priv->bus_desc.provider_name = kstrdup(pdev->name, GFP_KERNEL); |
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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)); | |
df3f1264 | 57 | ndr_desc.numa_node = dev_to_node(&pdev->dev); |
8fc5c735 | 58 | ndr_desc.target_node = ndr_desc.numa_node; |
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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); | |
338f6dac AK |
65 | else { |
66 | set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags); | |
71719760 | 67 | region = nvdimm_pmem_region_create(bus, &ndr_desc); |
338f6dac | 68 | } |
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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" }, | |
8c26ab72 | 93 | { .compatible = "pmem-region-v2" }, |
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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", | |
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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"); |