1 // SPDX-License-Identifier: GPL-2.0+ 2 3 #define pr_fmt(fmt) "of_pmem: " fmt 4 5 #include <linux/of.h> 6 #include <linux/libnvdimm.h> 7 #include <linux/module.h> 8 #include <linux/ioport.h> 9 #include <linux/platform_device.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 set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags); 67 region = nvdimm_pmem_region_create(bus, &ndr_desc); 68 } 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" }, 93 { .compatible = "pmem-region-v2" }, 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", 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"); 110