+++ /dev/null
-From 1ecfdf8a7a08d52d238dc132c85d37966ca58737 Mon Sep 17 00:00:00 2001
-From: popcornmix <popcornmix@gmail.com>
-Date: Wed, 3 Jul 2013 00:51:55 +0100
-Subject: [PATCH 047/196] 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
-
-diff --git a/arch/arm/mach-bcm2708/include/mach/platform.h b/arch/arm/mach-bcm2708/include/mach/platform.h
-index 89e72d1..992a630 100644
---- 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 */
-diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
-index 2f9dbf7..d725a53 100644
---- 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.
-+
-diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
-index bed467c..18fc4d4 100644
---- a/drivers/char/hw_random/Makefile
-+++ b/drivers/char/hw_random/Makefile
-@@ -27,3 +27,4 @@ obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o
- obj-$(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
-diff --git a/drivers/char/hw_random/bcm2708-rng.c b/drivers/char/hw_random/bcm2708-rng.c
-new file mode 100755
-index 0000000..1ffa7d7
---- /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");
---
-1.9.1
-
projects / 15.05 / openwrt.git / blobdiff