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Subject[patch 7/9] Add ixp4xx HW RNG driver
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Index: hwrng/drivers/char/hw_random/Kconfig
===================================================================
--- hwrng.orig/drivers/char/hw_random/Kconfig 2006-05-08 00:12:20.000000000 +0200
+++ hwrng/drivers/char/hw_random/Kconfig 2006-05-08 00:15:58.000000000 +0200
@@ -61,3 +61,16 @@
module will be called via-rng.

If unsure, say Y.
+
+config HW_RANDOM_IXP4XX
+ tristate "Intel IXP4xx NPU HW Random Number Generator support"
+ depends on HW_RANDOM && ARCH_IXP4XX
+ default y
+ ---help---
+ This driver provides kernel-side support for the Random
+ Number Generator hardware found on the Intel IXP4xx NPU.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ixp4xx-rng.
+
+ If unsure, say Y.
Index: hwrng/drivers/char/hw_random/Makefile
===================================================================
--- hwrng.orig/drivers/char/hw_random/Makefile 2006-05-08 00:12:12.000000000 +0200
+++ hwrng/drivers/char/hw_random/Makefile 2006-05-08 00:15:42.000000000 +0200
@@ -7,3 +7,4 @@
obj-$(CONFIG_HW_RANDOM_AMD) += amd-rng.o
obj-$(CONFIG_HW_RANDOM_GEODE) += geode-rng.o
obj-$(CONFIG_HW_RANDOM_VIA) += via-rng.o
+obj-$(CONFIG_HW_RANDOM_IXP4XX) += ixp4xx-rng.o
Index: hwrng/drivers/char/hw_random/ixp4xx-rng.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ hwrng/drivers/char/hw_random/ixp4xx-rng.c 2006-05-08 00:12:34.000000000 +0200
@@ -0,0 +1,73 @@
+/*
+ * drivers/char/rng/ixp4xx-rng.c
+ *
+ * RNG driver for Intel IXP4xx family of NPUs
+ *
+ * Author: Deepak Saxena <dsaxena@plexity.net>
+ *
+ * Copyright 2005 (c) MontaVista Software, Inc.
+ *
+ * Fixes by Michael Buesch
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/hw_random.h>
+
+#include <asm/io.h>
+#include <asm/hardware.h>
+
+
+static int ixp4xx_rng_data_read(struct hwrng *rng, u32 *buffer)
+{
+ void __iomem * rng_base = (void __iomem *)rng->priv;
+
+ *buffer = __raw_readl(rng_base);
+
+ return 4;
+}
+
+static struct hwrng ixp4xx_rng_ops = {
+ .name = "ixp4xx",
+ .data_read = ixp4xx_rng_data_read,
+};
+
+static int __init ixp4xx_rng_init(void)
+{
+ void __iomem * rng_base;
+ int err;
+
+ rng_base = ioremap(0x70002100, 4);
+ if (!rng_base)
+ return -ENOMEM;
+ ixp4xx_rng_ops.priv = (unsigned long)rng_base;
+ err = hwrng_register(&ixp4xx_rng_ops);
+ if (err)
+ iounmap(rng_base);
+
+ return err;
+}
+
+static void __exit ixp4xx_rng_exit(void)
+{
+ void __iomem * rng_base = (void __iomem *)ixp4xx_rng_ops.priv;
+
+ hwrng_unregister(&ixp4xx_rng_ops);
+ iounmap(rng_base);
+}
+
+subsys_initcall(ixp4xx_rng_init);
+module_exit(ixp4xx_rng_exit);
+
+MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
+MODULE_DESCRIPTION("H/W Random Number Generator (RNG) driver for IXP4xx");
+MODULE_LICENSE("GPL");
--

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