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// SPDX-License-Identifier: GPL-2.0+
#define pr_fmt(fmt) "of_pmem: " fmt
#include <linux/of.h>
#include <linux/libnvdimm.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct of_pmem_private {
struct nvdimm_bus_descriptor bus_desc;
struct nvdimm_bus *bus;
};
static int of_pmem_region_probe(struct platform_device *pdev)
{
struct of_pmem_private *priv;
struct device_node *np;
struct nvdimm_bus *bus;
bool is_volatile;
int i;
np = dev_of_node(&pdev->dev);
if (!np)
return -ENXIO;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->bus_desc.provider_name = devm_kstrdup(&pdev->dev, pdev->name,
GFP_KERNEL);
if (!priv->bus_desc.provider_name) {
kfree(priv);
return -ENOMEM;
}
priv->bus_desc.module = THIS_MODULE;
priv->bus_desc.of_node = np;
priv->bus = bus = nvdimm_bus_register(&pdev->dev, &priv->bus_desc);
if (!bus) {
kfree(priv);
return -ENODEV;
}
platform_set_drvdata(pdev, priv);
is_volatile = of_property_read_bool(np, "volatile");
dev_dbg(&pdev->dev, "Registering %s regions from %pOF\n",
is_volatile ? "volatile" : "non-volatile", np);
for (i = 0; i < pdev->num_resources; i++) {
struct nd_region_desc ndr_desc;
struct nd_region *region;
/*
* NB: libnvdimm copies the data from ndr_desc into it's own
* structures so passing a stack pointer is fine.
*/
memset(&ndr_desc, 0, sizeof(ndr_desc));
ndr_desc.numa_node = dev_to_node(&pdev->dev);
ndr_desc.target_node = ndr_desc.numa_node;
ndr_desc.res = &pdev->resource[i];
ndr_desc.of_node = np;
set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
if (is_volatile)
region = nvdimm_volatile_region_create(bus, &ndr_desc);
else {
set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags);
region = nvdimm_pmem_region_create(bus, &ndr_desc);
}
if (!region)
dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n",
ndr_desc.res, np);
else
dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
ndr_desc.res, np);
}
return 0;
}
static void of_pmem_region_remove(struct platform_device *pdev)
{
struct of_pmem_private *priv = platform_get_drvdata(pdev);
nvdimm_bus_unregister(priv->bus);
kfree(priv);
}
static const struct of_device_id of_pmem_region_match[] = {
{ .compatible = "pmem-region" },
{ .compatible = "pmem-region-v2" },
{ },
};
static struct platform_driver of_pmem_region_driver = {
.probe = of_pmem_region_probe,
.remove_new = of_pmem_region_remove,
.driver = {
.name = "of_pmem",
.of_match_table = of_pmem_region_match,
},
};
module_platform_driver(of_pmem_region_driver);
MODULE_DEVICE_TABLE(of, of_pmem_region_match);
MODULE_DESCRIPTION("NVDIMM Device Tree support");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("IBM Corporation");
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