92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Hardware Random Number Generator support.
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* Cavium Thunder, Marvell OcteonTx/Tx2 processor families.
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*
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* Copyright (C) 2016 Cavium, Inc.
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*/
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#include <linux/hw_random.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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#define THUNDERX_RNM_ENT_EN 0x1
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#define THUNDERX_RNM_RNG_EN 0x2
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struct cavium_rng_pf {
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void __iomem *control_status;
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};
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/* Enable the RNG hardware and activate the VF */
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static int cavium_rng_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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struct cavium_rng_pf *rng;
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int iov_err;
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rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
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if (!rng)
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return -ENOMEM;
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/*Map the RNG control */
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rng->control_status = pcim_iomap(pdev, 0, 0);
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if (!rng->control_status) {
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dev_err(&pdev->dev,
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"Error iomap failed retrieving control_status.\n");
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return -ENOMEM;
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}
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/* Enable the RNG hardware and entropy source */
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writeq(THUNDERX_RNM_RNG_EN | THUNDERX_RNM_ENT_EN,
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rng->control_status);
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pci_set_drvdata(pdev, rng);
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/* Enable the Cavium RNG as a VF */
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iov_err = pci_enable_sriov(pdev, 1);
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if (iov_err != 0) {
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/* Disable the RNG hardware and entropy source */
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writeq(0, rng->control_status);
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dev_err(&pdev->dev,
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"Error initializing RNG virtual function,(%i).\n",
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iov_err);
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return iov_err;
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}
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return 0;
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}
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/* Disable VF and RNG Hardware */
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static void cavium_rng_remove(struct pci_dev *pdev)
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{
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struct cavium_rng_pf *rng;
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rng = pci_get_drvdata(pdev);
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/* Remove the VF */
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pci_disable_sriov(pdev);
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/* Disable the RNG hardware and entropy source */
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writeq(0, rng->control_status);
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}
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static const struct pci_device_id cavium_rng_pf_id_table[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa018), 0, 0, 0}, /* Thunder RNM */
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{0,},
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};
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MODULE_DEVICE_TABLE(pci, cavium_rng_pf_id_table);
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static struct pci_driver cavium_rng_pf_driver = {
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.name = "cavium_rng_pf",
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.id_table = cavium_rng_pf_id_table,
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.probe = cavium_rng_probe,
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.remove = cavium_rng_remove,
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};
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module_pci_driver(cavium_rng_pf_driver);
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MODULE_AUTHOR("Omer Khaliq <okhaliq@caviumnetworks.com>");
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MODULE_LICENSE("GPL v2");
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