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                         region = nvdimm_pmem_region_create(bus, &ndr_desc);
  67
  68                 if (!region)
  69                         dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n",
  70                                         ndr_desc.res, np);
  71                 else
  72                         dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
  73                                         ndr_desc.res, np);
  74         }
  75
  76         return 0;
  77 }
  78
  79 static int of_pmem_region_remove(struct platform_device *pdev)
  80 {
  81         struct of_pmem_private *priv = platform_get_drvdata(pdev);
  82
  83         nvdimm_bus_unregister(priv->bus);
  84         kfree(priv);
  85
  86         return 0;
  87 }
  88
  89 static const struct of_device_id of_pmem_region_match[] = {
  90         { .compatible = "pmem-region" },
  91         { },
  92 };
  93
  94 static struct platform_driver of_pmem_region_driver = {
  95         .probe = of_pmem_region_probe,
  96         .remove = of_pmem_region_remove,
  97         .driver = {
  98                 .name = "of_pmem",
  99                 .of_match_table = of_pmem_region_match,
 100         },
 101 };
 102
 103 module_platform_driver(of_pmem_region_driver);
 104 MODULE_DEVICE_TABLE(of, of_pmem_region_match);
 105 MODULE_LICENSE("GPL");
 106 MODULE_AUTHOR("IBM Corporation");