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 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
  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.target_node = ndr_desc.numa_node;
  72                 ndr_desc.res = &pdev->resource[i];
  73                 ndr_desc.of_node = np;
  74                 set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
  75
  76                 if (is_volatile)
  77                         region = nvdimm_volatile_region_create(bus, &ndr_desc);
  78                 else
  79                         region = nvdimm_pmem_region_create(bus, &ndr_desc);
  80
  81                 if (!region)
  82                         dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n",
  83                                         ndr_desc.res, np);
  84                 else
  85                         dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
  86                                         ndr_desc.res, np);
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int of_pmem_region_remove(struct platform_device *pdev)
  93 {
  94         struct of_pmem_private *priv = platform_get_drvdata(pdev);
  95
  96         nvdimm_bus_unregister(priv->bus);
  97         kfree(priv);
  98
  99         return 0;
 100 }
 101
 102 static const struct of_device_id of_pmem_region_match[] = {
 103         { .compatible = "pmem-region" },
 104         { },
 105 };
 106
 107 static struct platform_driver of_pmem_region_driver = {
 108         .probe = of_pmem_region_probe,
 109         .remove = of_pmem_region_remove,
 110         .driver = {
 111                 .name = "of_pmem",
 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");