diff options
Diffstat (limited to 'target/linux/brcm2708/patches-3.18/0014-Add-hwrng-hardware-random-number-generator-driver.patch')
| -rwxr-xr-x | target/linux/brcm2708/patches-3.18/0014-Add-hwrng-hardware-random-number-generator-driver.patch | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-3.18/0014-Add-hwrng-hardware-random-number-generator-driver.patch b/target/linux/brcm2708/patches-3.18/0014-Add-hwrng-hardware-random-number-generator-driver.patch new file mode 100755 index 0000000000..2e6a726fdb --- /dev/null +++ b/target/linux/brcm2708/patches-3.18/0014-Add-hwrng-hardware-random-number-generator-driver.patch @@ -0,0 +1,172 @@ +From 225e1250dfcec7b09493b6a86bdeaab9f2669221 Mon Sep 17 00:00:00 2001 +From: popcornmix <popcornmix@gmail.com> +Date: Wed, 3 Jul 2013 00:51:55 +0100 +Subject: [PATCH 014/114] Add hwrng (hardware random number generator) driver + +--- + drivers/char/hw_random/Kconfig | 11 ++++ + drivers/char/hw_random/Makefile | 1 + + drivers/char/hw_random/bcm2708-rng.c | 118 +++++++++++++++++++++++++++++++++++ + 3 files changed, 130 insertions(+) + create mode 100755 drivers/char/hw_random/bcm2708-rng.c + +diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig +index 91a04ae..0d2ca0d 100644 +--- a/drivers/char/hw_random/Kconfig ++++ b/drivers/char/hw_random/Kconfig +@@ -320,6 +320,17 @@ config HW_RANDOM_TPM + + If unsure, say Y. + ++config HW_RANDOM_BCM2708 ++ tristate "BCM2708 generic true random number generator support" ++ depends on HW_RANDOM && ARCH_BCM2708 ++ ---help--- ++ This driver provides the kernel-side support for the BCM2708 hardware. ++ ++ To compile this driver as a module, choose M here: the ++ module will be called bcm2708-rng. ++ ++ If unsure, say N. ++ + config HW_RANDOM_MSM + tristate "Qualcomm SoCs Random Number Generator support" + depends on HW_RANDOM && ARCH_QCOM +diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile +index 0b4cd57..78b019c 100644 +--- a/drivers/char/hw_random/Makefile ++++ b/drivers/char/hw_random/Makefile +@@ -28,5 +28,6 @@ obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o + obj-$(CONFIG_HW_RANDOM_EXYNOS) += exynos-rng.o + obj-$(CONFIG_HW_RANDOM_TPM) += tpm-rng.o + obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o ++obj-$(CONFIG_HW_RANDOM_BCM2708) += bcm2708-rng.o + obj-$(CONFIG_HW_RANDOM_MSM) += msm-rng.o + obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o +diff --git a/drivers/char/hw_random/bcm2708-rng.c b/drivers/char/hw_random/bcm2708-rng.c +new file mode 100755 +index 0000000..340f004 +--- /dev/null ++++ b/drivers/char/hw_random/bcm2708-rng.c +@@ -0,0 +1,118 @@ ++/** ++ * Copyright (c) 2010-2012 Broadcom. All rights reserved. ++ * ++ * Redistribution and use in source and binary forms, with or without ++ * modification, are permitted provided that the following conditions ++ * are met: ++ * 1. Redistributions of source code must retain the above copyright ++ * notice, this list of conditions, and the following disclaimer, ++ * without modification. ++ * 2. Redistributions in binary form must reproduce the above copyright ++ * notice, this list of conditions and the following disclaimer in the ++ * documentation and/or other materials provided with the distribution. ++ * 3. The names of the above-listed copyright holders may not be used ++ * to endorse or promote products derived from this software without ++ * specific prior written permission. ++ * ++ * ALTERNATIVELY, this software may be distributed under the terms of the ++ * GNU General Public License ("GPL") version 2, as published by the Free ++ * Software Foundation. ++ * ++ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS ++ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, ++ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR ++ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR ++ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, ++ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, ++ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR ++ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ++ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING ++ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ++ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ++ */ ++ ++#include <linux/kernel.h> ++#include <linux/module.h> ++#include <linux/init.h> ++#include <linux/hw_random.h> ++#include <linux/printk.h> ++ ++#include <asm/io.h> ++#include <mach/hardware.h> ++#include <mach/platform.h> ++ ++#define RNG_CTRL (0x0) ++#define RNG_STATUS (0x4) ++#define RNG_DATA (0x8) ++#define RNG_FF_THRESHOLD (0xc) ++ ++/* enable rng */ ++#define RNG_RBGEN 0x1 ++/* double speed, less random mode */ ++#define RNG_RBG2X 0x2 ++ ++/* the initial numbers generated are "less random" so will be discarded */ ++#define RNG_WARMUP_COUNT 0x40000 ++ ++static int bcm2708_rng_data_read(struct hwrng *rng, u32 *buffer) ++{ ++ void __iomem *rng_base = (void __iomem *)rng->priv; ++ unsigned words; ++ /* wait for a random number to be in fifo */ ++ do { ++ words = __raw_readl(rng_base + RNG_STATUS)>>24; ++ } ++ while (words == 0); ++ /* read the random number */ ++ *buffer = __raw_readl(rng_base + RNG_DATA); ++ return 4; ++} ++ ++static struct hwrng bcm2708_rng_ops = { ++ .name = "bcm2708", ++ .data_read = bcm2708_rng_data_read, ++}; ++ ++static int __init bcm2708_rng_init(void) ++{ ++ void __iomem *rng_base; ++ int err; ++ ++ /* map peripheral */ ++ rng_base = ioremap(RNG_BASE, 0x10); ++ pr_info("bcm2708_rng_init=%p\n", rng_base); ++ if (!rng_base) { ++ pr_err("bcm2708_rng_init failed to ioremap\n"); ++ return -ENOMEM; ++ } ++ bcm2708_rng_ops.priv = (unsigned long)rng_base; ++ ++ /* set warm-up count & enable */ ++ __raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS); ++ __raw_writel(RNG_RBGEN, rng_base + RNG_CTRL); ++ ++ /* register driver */ ++ err = hwrng_register(&bcm2708_rng_ops); ++ if (err) { ++ pr_err("bcm2708_rng_init hwrng_register()=%d\n", err); ++ iounmap(rng_base); ++ } ++ return err; ++} ++ ++static void __exit bcm2708_rng_exit(void) ++{ ++ void __iomem *rng_base = (void __iomem *)bcm2708_rng_ops.priv; ++ pr_info("bcm2708_rng_exit\n"); ++ /* disable rng hardware */ ++ __raw_writel(0, rng_base + RNG_CTRL); ++ /* unregister driver */ ++ hwrng_unregister(&bcm2708_rng_ops); ++ iounmap(rng_base); ++} ++ ++module_init(bcm2708_rng_init); ++module_exit(bcm2708_rng_exit); ++ ++MODULE_DESCRIPTION("BCM2708 H/W Random Number Generator (RNG) driver"); ++MODULE_LICENSE("GPL and additional rights"); +-- +1.8.3.2 + |