148 lines
3.2 KiB
C
148 lines
3.2 KiB
C
/*
|
|
* Hardware Random Number Generator support for Cavium Networks
|
|
* Octeon 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) 2009 Cavium Networks
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/device.h>
|
|
#include <linux/hw_random.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/octeon/octeon.h>
|
|
#include <asm/octeon/cvmx-rnm-defs.h>
|
|
|
|
struct octeon_rng {
|
|
struct hwrng ops;
|
|
void __iomem *control_status;
|
|
void __iomem *result;
|
|
};
|
|
|
|
static int octeon_rng_init(struct hwrng *rng)
|
|
{
|
|
union cvmx_rnm_ctl_status ctl;
|
|
struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
|
|
|
|
ctl.u64 = 0;
|
|
ctl.s.ent_en = 1; /* Enable the entropy source. */
|
|
ctl.s.rng_en = 1; /* Enable the RNG hardware. */
|
|
cvmx_write_csr((u64)p->control_status, ctl.u64);
|
|
return 0;
|
|
}
|
|
|
|
static void octeon_rng_cleanup(struct hwrng *rng)
|
|
{
|
|
union cvmx_rnm_ctl_status ctl;
|
|
struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
|
|
|
|
ctl.u64 = 0;
|
|
/* Disable everything. */
|
|
cvmx_write_csr((u64)p->control_status, ctl.u64);
|
|
}
|
|
|
|
static int octeon_rng_data_read(struct hwrng *rng, u32 *data)
|
|
{
|
|
struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
|
|
|
|
*data = cvmx_read64_uint32((u64)p->result);
|
|
return sizeof(u32);
|
|
}
|
|
|
|
static int __devinit octeon_rng_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res_ports;
|
|
struct resource *res_result;
|
|
struct octeon_rng *rng;
|
|
int ret;
|
|
struct hwrng ops = {
|
|
.name = "octeon",
|
|
.init = octeon_rng_init,
|
|
.cleanup = octeon_rng_cleanup,
|
|
.data_read = octeon_rng_data_read
|
|
};
|
|
|
|
rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
|
|
if (!rng)
|
|
return -ENOMEM;
|
|
|
|
res_ports = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res_ports)
|
|
goto err_ports;
|
|
|
|
res_result = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
if (!res_result)
|
|
goto err_ports;
|
|
|
|
|
|
rng->control_status = devm_ioremap_nocache(&pdev->dev,
|
|
res_ports->start,
|
|
sizeof(u64));
|
|
if (!rng->control_status)
|
|
goto err_ports;
|
|
|
|
rng->result = devm_ioremap_nocache(&pdev->dev,
|
|
res_result->start,
|
|
sizeof(u64));
|
|
if (!rng->result)
|
|
goto err_r;
|
|
|
|
rng->ops = ops;
|
|
|
|
dev_set_drvdata(&pdev->dev, &rng->ops);
|
|
ret = hwrng_register(&rng->ops);
|
|
if (ret)
|
|
goto err;
|
|
|
|
dev_info(&pdev->dev, "Octeon Random Number Generator\n");
|
|
|
|
return 0;
|
|
err:
|
|
devm_iounmap(&pdev->dev, rng->control_status);
|
|
err_r:
|
|
devm_iounmap(&pdev->dev, rng->result);
|
|
err_ports:
|
|
devm_kfree(&pdev->dev, rng);
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int __exit octeon_rng_remove(struct platform_device *pdev)
|
|
{
|
|
struct hwrng *rng = dev_get_drvdata(&pdev->dev);
|
|
|
|
hwrng_unregister(rng);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver octeon_rng_driver = {
|
|
.driver = {
|
|
.name = "octeon_rng",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = octeon_rng_probe,
|
|
.remove = __exit_p(octeon_rng_remove),
|
|
};
|
|
|
|
static int __init octeon_rng_mod_init(void)
|
|
{
|
|
return platform_driver_register(&octeon_rng_driver);
|
|
}
|
|
|
|
static void __exit octeon_rng_mod_exit(void)
|
|
{
|
|
platform_driver_unregister(&octeon_rng_driver);
|
|
}
|
|
|
|
module_init(octeon_rng_mod_init);
|
|
module_exit(octeon_rng_mod_exit);
|
|
|
|
MODULE_AUTHOR("David Daney");
|
|
MODULE_LICENSE("GPL");
|