/* * Hardware Random Number Generator support for Cavium Inc. * Thunder processor family. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2016 Cavium, Inc. */ #include <linux/hw_random.h> #include <linux/io.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/pci_ids.h> #define THUNDERX_RNM_ENT_EN 0x1 #define THUNDERX_RNM_RNG_EN 0x2 struct cavium_rng_pf { void __iomem *control_status; }; /* Enable the RNG hardware and activate the VF */ static int cavium_rng_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct cavium_rng_pf *rng; int iov_err; rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL); if (!rng) return -ENOMEM; /*Map the RNG control */ rng->control_status = pcim_iomap(pdev, 0, 0); if (!rng->control_status) { dev_err(&pdev->dev, "Error iomap failed retrieving control_status.\n"); return -ENOMEM; } /* Enable the RNG hardware and entropy source */ writeq(THUNDERX_RNM_RNG_EN | THUNDERX_RNM_ENT_EN, rng->control_status); pci_set_drvdata(pdev, rng); /* Enable the Cavium RNG as a VF */ iov_err = pci_enable_sriov(pdev, 1); if (iov_err != 0) { /* Disable the RNG hardware and entropy source */ writeq(0, rng->control_status); dev_err(&pdev->dev, "Error initializing RNG virtual function,(%i).\n", iov_err); return iov_err; } return 0; } /* Disable VF and RNG Hardware */ static void cavium_rng_remove(struct pci_dev *pdev) { struct cavium_rng_pf *rng; rng = pci_get_drvdata(pdev); /* Remove the VF */ pci_disable_sriov(pdev); /* Disable the RNG hardware and entropy source */ writeq(0, rng->control_status); } static const struct pci_device_id cavium_rng_pf_id_table[] = { { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa018), 0, 0, 0}, /* Thunder RNM */ {0,}, }; MODULE_DEVICE_TABLE(pci, cavium_rng_pf_id_table); static struct pci_driver cavium_rng_pf_driver = { .name = "cavium_rng_pf", .id_table = cavium_rng_pf_id_table, .probe = cavium_rng_probe, .remove = cavium_rng_remove, }; module_pci_driver(cavium_rng_pf_driver); MODULE_AUTHOR("Omer Khaliq <okhaliq@caviumnetworks.com>"); MODULE_LICENSE("GPL");