Release 4.11 drivers/char/hw_random/omap3-rom-rng.c
/*
* omap3-rom-rng.c - RNG driver for TI OMAP3 CPU family
*
* Copyright (C) 2009 Nokia Corporation
* Author: Juha Yrjola <juha.yrjola@solidboot.com>
*
* Copyright (C) 2013 Pali Rohár <pali.rohar@gmail.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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/random.h>
#include <linux/hw_random.h>
#include <linux/workqueue.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#define RNG_RESET 0x01
#define RNG_GEN_PRNG_HW_INIT 0x02
#define RNG_GEN_HW 0x08
/* param1: ptr, param2: count, param3: flag */
static u32 (*omap3_rom_rng_call)(u32, u32, u32);
static struct delayed_work idle_work;
static int rng_idle;
static struct clk *rng_clk;
static void omap3_rom_rng_idle(struct work_struct *work)
{
int r;
r = omap3_rom_rng_call(0, 0, RNG_RESET);
if (r != 0) {
pr_err("reset failed: %d\n", r);
return;
}
clk_disable_unprepare(rng_clk);
rng_idle = 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pali Rohár | 46 | 92.00% | 1 | 50.00% |
| Aaro Koskinen | 4 | 8.00% | 1 | 50.00% |
| Total | 50 | 100.00% | 2 | 100.00% |
static int omap3_rom_rng_get_random(void *buf, unsigned int count)
{
u32 r;
u32 ptr;
cancel_delayed_work_sync(&idle_work);
if (rng_idle) {
clk_prepare_enable(rng_clk);
r = omap3_rom_rng_call(0, 0, RNG_GEN_PRNG_HW_INIT);
if (r != 0) {
clk_disable_unprepare(rng_clk);
pr_err("HW init failed: %d\n", r);
return -EIO;
}
rng_idle = 0;
}
ptr = virt_to_phys(buf);
r = omap3_rom_rng_call(ptr, count, RNG_GEN_HW);
schedule_delayed_work(&idle_work, msecs_to_jiffies(500));
if (r != 0)
return -EINVAL;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pali Rohár | 114 | 96.61% | 1 | 50.00% |
| Aaro Koskinen | 4 | 3.39% | 1 | 50.00% |
| Total | 118 | 100.00% | 2 | 100.00% |
static int omap3_rom_rng_read(struct hwrng *rng, void *data, size_t max, bool w)
{
int r;
r = omap3_rom_rng_get_random(data, 4);
if (r < 0)
return r;
return 4;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pali Rohár | 37 | 82.22% | 1 | 50.00% |
| PrasannaKumar Muralidharan | 8 | 17.78% | 1 | 50.00% |
| Total | 45 | 100.00% | 2 | 100.00% |
static struct hwrng omap3_rom_rng_ops = {
.name = "omap3-rom",
.read = omap3_rom_rng_read,
};
static int omap3_rom_rng_probe(struct platform_device *pdev)
{
pr_info("initializing\n");
omap3_rom_rng_call = pdev->dev.platform_data;
if (!omap3_rom_rng_call) {
pr_err("omap3_rom_rng_call is NULL\n");
return -EINVAL;
}
INIT_DELAYED_WORK(&idle_work, omap3_rom_rng_idle);
rng_clk = devm_clk_get(&pdev->dev, "ick");
if (IS_ERR(rng_clk)) {
pr_err("unable to get RNG clock\n");
return PTR_ERR(rng_clk);
}
/* Leave the RNG in reset state. */
clk_prepare_enable(rng_clk);
omap3_rom_rng_idle(0);
return hwrng_register(&omap3_rom_rng_ops);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pali Rohár | 95 | 96.94% | 1 | 33.33% |
| Aaro Koskinen | 2 | 2.04% | 1 | 33.33% |
| Jingoo Han | 1 | 1.02% | 1 | 33.33% |
| Total | 98 | 100.00% | 3 | 100.00% |
static int omap3_rom_rng_remove(struct platform_device *pdev)
{
cancel_delayed_work_sync(&idle_work);
hwrng_unregister(&omap3_rom_rng_ops);
clk_disable_unprepare(rng_clk);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pali Rohár | 25 | 80.65% | 1 | 50.00% |
| Aaro Koskinen | 6 | 19.35% | 1 | 50.00% |
| Total | 31 | 100.00% | 2 | 100.00% |
static struct platform_driver omap3_rom_rng_driver = {
.driver = {
.name = "omap3-rom-rng",
},
.probe = omap3_rom_rng_probe,
.remove = omap3_rom_rng_remove,
};
module_platform_driver(omap3_rom_rng_driver);
MODULE_ALIAS("platform:omap3-rom-rng");
MODULE_AUTHOR("Juha Yrjola");
MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
MODULE_LICENSE("GPL");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Pali Rohár | 455 | 93.81% | 1 | 25.00% |
| Aaro Koskinen | 19 | 3.92% | 1 | 25.00% |
| PrasannaKumar Muralidharan | 10 | 2.06% | 1 | 25.00% |
| Jingoo Han | 1 | 0.21% | 1 | 25.00% |
| Total | 485 | 100.00% | 4 | 100.00% |
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