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94 lines
2.2 KiB
94 lines
2.2 KiB
/* |
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* Hardware Random Number Generator support for Cavium Inc. |
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* Thunder processor family. |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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