--- /dev/null
+From 8a467ffd4cdce4f87c363c24be193b99b2688126 Mon Sep 17 00:00:00 2001
+From: popcornmix <popcornmix@gmail.com>
+Date: Wed, 3 Jul 2013 00:51:55 +0100
+Subject: [PATCH 047/174] Add hwrng (hardware random number generator) driver
+
+---
+ arch/arm/mach-bcm2708/include/mach/platform.h | 1 +
+ drivers/char/hw_random/Kconfig | 12 +++
+ drivers/char/hw_random/Makefile | 1 +
+ drivers/char/hw_random/bcm2708-rng.c | 117 ++++++++++++++++++++++++++
+ 4 files changed, 131 insertions(+)
+ create mode 100755 drivers/char/hw_random/bcm2708-rng.c
+
+--- a/arch/arm/mach-bcm2708/include/mach/platform.h
++++ b/arch/arm/mach-bcm2708/include/mach/platform.h
+@@ -62,6 +62,7 @@
+ #define DMA_BASE (BCM2708_PERI_BASE + 0x7000) /* DMA controller */
+ #define ARM_BASE (BCM2708_PERI_BASE + 0xB000) /* BCM2708 ARM control block */
+ #define PM_BASE (BCM2708_PERI_BASE + 0x100000) /* Power Management, Reset controller and Watchdog registers */
++#define RNG_BASE (BCM2708_PERI_BASE + 0x104000) /* Hardware RNG */
+ #define GPIO_BASE (BCM2708_PERI_BASE + 0x200000) /* GPIO */
+ #define UART0_BASE (BCM2708_PERI_BASE + 0x201000) /* Uart 0 */
+ #define MMCI0_BASE (BCM2708_PERI_BASE + 0x202000) /* MMC interface */
+--- a/drivers/char/hw_random/Kconfig
++++ b/drivers/char/hw_random/Kconfig
+@@ -314,3 +314,15 @@ config HW_RANDOM_TPM
+ module will be called tpm-rng.
+
+ 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.
++
+--- a/drivers/char/hw_random/Makefile
++++ b/drivers/char/hw_random/Makefile
+@@ -27,3 +27,4 @@ obj-$(CONFIG_HW_RANDOM_PSERIES) += pseri
+ obj-$(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
+--- /dev/null
++++ b/drivers/char/hw_random/bcm2708-rng.c
+@@ -0,0 +1,117 @@
++/**
++ * 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;
++ /* register driver */
++ err = hwrng_register(&bcm2708_rng_ops);
++ if (err) {
++ pr_err("bcm2708_rng_init hwrng_register()=%d\n", err);
++ iounmap(rng_base);
++ } else {
++ /* set warm-up count & enable */
++ __raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS);
++ __raw_writel(RNG_RBGEN, rng_base + RNG_CTRL);
++ }
++ 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");
projects / openwrt.git / blobdiff