mirror of
https://github.com/torvalds/linux.git
synced 2024-11-19 02:21:47 +00:00
cc2f1908c6
The Cavium ThunderX SoC has a hardware random number generator. This driver provides support using the HWRNG framework. Signed-off-by: Omer Khaliq <okhaliq@caviumnetworks.com> Signed-off-by: Ananth Jasty <Ananth.Jasty@cavium.com> Acked-by: David Daney <david.daney@cavium.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/*
|
|
* 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 */
|
|
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");
|