Release 4.11 drivers/char/hw_random/geode-rng.c
/*
* RNG driver for AMD Geode RNGs
*
* Copyright 2005 (c) MontaVista Software, Inc.
*
* with the majority of the code coming from:
*
* Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
* (c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>
*
* derived from
*
* Hardware driver for the AMD 768 Random Number Generator (RNG)
* (c) Copyright 2001 Red Hat Inc
*
* derived from
*
* Hardware driver for Intel i810 Random Number Generator (RNG)
* Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
* Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/delay.h>
#include <linux/hw_random.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#define PFX KBUILD_MODNAME ": "
#define GEODE_RNG_DATA_REG 0x50
#define GEODE_RNG_STATUS_REG 0x54
/*
* Data for PCI driver interface
*
* This data only exists for exporting the supported
* PCI ids via MODULE_DEVICE_TABLE. We do not actually
* register a pci_driver, because someone else might one day
* want to register another driver on the same PCI id.
*/
static const struct pci_device_id pci_tbl[] = {
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), 0, },
{ 0, }, /* terminate list */
};
MODULE_DEVICE_TABLE(pci, pci_tbl);
static int geode_rng_data_read(struct hwrng *rng, u32 *data)
{
void __iomem *mem = (void __iomem *)rng->priv;
*data = readl(mem + GEODE_RNG_DATA_REG);
return 4;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Büsch | 42 | 100.00% | 1 | 100.00% |
| Total | 42 | 100.00% | 1 | 100.00% |
static int geode_rng_data_present(struct hwrng *rng, int wait)
{
void __iomem *mem = (void __iomem *)rng->priv;
int data, i;
for (i = 0; i < 20; i++) {
data = !!(readl(mem + GEODE_RNG_STATUS_REG));
if (data || !wait)
break;
udelay(10);
}
return data;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 41 | 53.25% | 1 | 50.00% |
| Michael Büsch | 36 | 46.75% | 1 | 50.00% |
| Total | 77 | 100.00% | 2 | 100.00% |
static struct hwrng geode_rng = {
.name = "geode",
.data_present = geode_rng_data_present,
.data_read = geode_rng_data_read,
};
static int __init mod_init(void)
{
int err = -ENODEV;
struct pci_dev *pdev = NULL;
const struct pci_device_id *ent;
void __iomem *mem;
unsigned long rng_base;
for_each_pci_dev(pdev) {
ent = pci_match_id(pci_tbl, pdev);
if (ent)
goto found;
}
/* Device not found. */
goto out;
found:
rng_base = pci_resource_start(pdev, 0);
if (rng_base == 0)
goto out;
err = -ENOMEM;
mem = ioremap(rng_base, 0x58);
if (!mem)
goto out;
geode_rng.priv = (unsigned long)mem;
pr_info("AMD Geode RNG detected\n");
err = hwrng_register(&geode_rng);
if (err) {
pr_err(PFX "RNG registering failed (%d)\n",
err);
goto err_unmap;
}
out:
return err;
err_unmap:
iounmap(mem);
goto out;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Büsch | 97 | 60.62% | 1 | 20.00% |
| Prarit Bhargava | 60 | 37.50% | 1 | 20.00% |
| PrasannaKumar Muralidharan | 1 | 0.62% | 1 | 20.00% |
| Wei Yongjun | 1 | 0.62% | 1 | 20.00% |
| Sudip Mukherjee | 1 | 0.62% | 1 | 20.00% |
| Total | 160 | 100.00% | 5 | 100.00% |
static void __exit mod_exit(void)
{
void __iomem *mem = (void __iomem *)geode_rng.priv;
hwrng_unregister(&geode_rng);
iounmap(mem);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Prarit Bhargava | 27 | 79.41% | 1 | 50.00% |
| Michael Büsch | 7 | 20.59% | 1 | 50.00% |
| Total | 34 | 100.00% | 2 | 100.00% |
module_init(mod_init);
module_exit(mod_exit);
MODULE_DESCRIPTION("H/W RNG driver for AMD Geode LX CPUs");
MODULE_LICENSE("GPL");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael Büsch | 271 | 64.52% | 2 | 20.00% |
| Prarit Bhargava | 91 | 21.67% | 1 | 10.00% |
| Patrick McHardy | 43 | 10.24% | 1 | 10.00% |
| PrasannaKumar Muralidharan | 7 | 1.67% | 2 | 20.00% |
| Joe Perches | 5 | 1.19% | 1 | 10.00% |
| Alan Cox | 1 | 0.24% | 1 | 10.00% |
| Wei Yongjun | 1 | 0.24% | 1 | 10.00% |
| Sudip Mukherjee | 1 | 0.24% | 1 | 10.00% |
| Total | 420 | 100.00% | 10 | 100.00% |
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