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