99 lines
2.2 KiB
C
99 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>
|
|
|
|
struct cavium_rng {
|
|
struct hwrng ops;
|
|
void __iomem *result;
|
|
};
|
|
|
|
/* Read data from the RNG unit */
|
|
static int cavium_rng_read(struct hwrng *rng, void *dat, size_t max, bool wait)
|
|
{
|
|
struct cavium_rng *p = container_of(rng, struct cavium_rng, ops);
|
|
unsigned int size = max;
|
|
|
|
while (size >= 8) {
|
|
*((u64 *)dat) = readq(p->result);
|
|
size -= 8;
|
|
dat += 8;
|
|
}
|
|
while (size > 0) {
|
|
*((u8 *)dat) = readb(p->result);
|
|
size--;
|
|
dat++;
|
|
}
|
|
return max;
|
|
}
|
|
|
|
/* Map Cavium RNG to an HWRNG object */
|
|
static int cavium_rng_probe_vf(struct pci_dev *pdev,
|
|
const struct pci_device_id *id)
|
|
{
|
|
struct cavium_rng *rng;
|
|
int ret;
|
|
|
|
rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
|
|
if (!rng)
|
|
return -ENOMEM;
|
|
|
|
/* Map the RNG result */
|
|
rng->result = pcim_iomap(pdev, 0, 0);
|
|
if (!rng->result) {
|
|
dev_err(&pdev->dev, "Error iomap failed retrieving result.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rng->ops.name = "cavium rng";
|
|
rng->ops.read = cavium_rng_read;
|
|
rng->ops.quality = 1000;
|
|
|
|
pci_set_drvdata(pdev, rng);
|
|
|
|
ret = hwrng_register(&rng->ops);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Error registering device as HWRNG.\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Remove the VF */
|
|
void cavium_rng_remove_vf(struct pci_dev *pdev)
|
|
{
|
|
struct cavium_rng *rng;
|
|
|
|
rng = pci_get_drvdata(pdev);
|
|
hwrng_unregister(&rng->ops);
|
|
}
|
|
|
|
static const struct pci_device_id cavium_rng_vf_id_table[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa033), 0, 0, 0},
|
|
{0,},
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, cavium_rng_vf_id_table);
|
|
|
|
static struct pci_driver cavium_rng_vf_driver = {
|
|
.name = "cavium_rng_vf",
|
|
.id_table = cavium_rng_vf_id_table,
|
|
.probe = cavium_rng_probe_vf,
|
|
.remove = cavium_rng_remove_vf,
|
|
};
|
|
module_pci_driver(cavium_rng_vf_driver);
|
|
|
|
MODULE_AUTHOR("Omer Khaliq <okhaliq@caviumnetworks.com>");
|
|
MODULE_LICENSE("GPL");
|