Release 4.11 drivers/char/hw_random/nomadik-rng.c
/*
* Nomadik RNG support
* Copyright 2009 Alessandro Rubini
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/amba/bus.h>
#include <linux/hw_random.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>
static struct clk *rng_clk;
static int nmk_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
{
void __iomem *base = (void __iomem *)rng->priv;
/*
* The register is 32 bits and gives 16 random bits (low half).
* A subsequent read will delay the core for 400ns, so we just read
* once and accept the very unlikely very small delay, even if wait==0.
*/
*(u16 *)data = __raw_readl(base + 8) & 0xffff;
return 2;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alessandro Rubini | 55 | 100.00% | 1 | 100.00% |
| Total | 55 | 100.00% | 1 | 100.00% |
/* we have at most one RNG per machine, granted */
static struct hwrng nmk_rng = {
.name = "nomadik",
.read = nmk_rng_read,
};
static int nmk_rng_probe(struct amba_device *dev, const struct amba_id *id)
{
void __iomem *base;
int ret;
rng_clk = devm_clk_get(&dev->dev, NULL);
if (IS_ERR(rng_clk)) {
dev_err(&dev->dev, "could not get rng clock\n");
ret = PTR_ERR(rng_clk);
return ret;
}
clk_prepare_enable(rng_clk);
ret = amba_request_regions(dev, dev->dev.init_name);
if (ret)
goto out_clk;
ret = -ENOMEM;
base = devm_ioremap(&dev->dev, dev->res.start,
resource_size(&dev->res));
if (!base)
goto out_release;
nmk_rng.priv = (unsigned long)base;
ret = hwrng_register(&nmk_rng);
if (ret)
goto out_release;
return 0;
out_release:
amba_release_regions(dev);
out_clk:
clk_disable(rng_clk);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alessandro Rubini | 109 | 63.01% | 1 | 16.67% |
| Srinidhi Kasagar | 49 | 28.32% | 1 | 16.67% |
| Jingoo Han | 8 | 4.62% | 1 | 16.67% |
| Julia Lawall | 5 | 2.89% | 1 | 16.67% |
| Linus Walleij | 1 | 0.58% | 1 | 16.67% |
| Russell King | 1 | 0.58% | 1 | 16.67% |
| Total | 173 | 100.00% | 6 | 100.00% |
static int nmk_rng_remove(struct amba_device *dev)
{
hwrng_unregister(&nmk_rng);
amba_release_regions(dev);
clk_disable(rng_clk);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alessandro Rubini | 25 | 83.33% | 1 | 50.00% |
| Srinidhi Kasagar | 5 | 16.67% | 1 | 50.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
static struct amba_id nmk_rng_ids[] = {
{
.id = 0x000805e1,
.mask = 0x000fffff, /* top bits are rev and cfg: accept all */
},
{0, 0},
};
MODULE_DEVICE_TABLE(amba, nmk_rng_ids);
static struct amba_driver nmk_rng_driver = {
.drv = {
.owner = THIS_MODULE,
.name = "rng",
},
.probe = nmk_rng_probe,
.remove = nmk_rng_remove,
.id_table = nmk_rng_ids,
};
module_amba_driver(nmk_rng_driver);
MODULE_LICENSE("GPL");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alessandro Rubini | 299 | 76.86% | 1 | 12.50% |
| Srinidhi Kasagar | 66 | 16.97% | 1 | 12.50% |
| Jingoo Han | 8 | 2.06% | 1 | 12.50% |
| Dave P Martin | 7 | 1.80% | 1 | 12.50% |
| Julia Lawall | 5 | 1.29% | 1 | 12.50% |
| Viresh Kumar | 2 | 0.51% | 1 | 12.50% |
| Linus Walleij | 1 | 0.26% | 1 | 12.50% |
| Russell King | 1 | 0.26% | 1 | 12.50% |
| Total | 389 | 100.00% | 8 | 100.00% |
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