162 lines
5.5 KiB
Diff
162 lines
5.5 KiB
Diff
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
|
|
|
|
--- 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
|
|
--- a/drivers/char/hw_random/Makefile
|
|
+++ b/drivers/char/hw_random/Makefile
|
|
@@ -28,5 +28,6 @@ obj-$(CONFIG_HW_RANDOM_POWERNV) += power
|
|
obj-$(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
|
|
--- /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");
|