1 files changed, 105 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/drivers/char/hw_random/ubicom32-rng.c b/target/linux/ubicom32/files/drivers/char/hw_random/ubicom32-rng.c
new file mode 100644
index 0000000000..e429589897
--- /dev/null
+++ b/target/linux/ubicom32/files/drivers/char/hw_random/ubicom32-rng.c
@@ -0,0 +1,105 @@
+/*
+ * drivers/net/ubi32-eth.c
+ *   Ubicom32 hardware random number generator driver.
+ *
+ * (C) Copyright 2009, Ubicom, Inc.
+ *
+ * This file is part of the Ubicom32 Linux Kernel Port.
+ *
+ * The Ubicom32 Linux Kernel Port is free software: you can redistribute
+ * it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Ubicom32 Linux Kernel Port is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Ubicom32 Linux Kernel Port.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ *
+ * Ubicom32 implementation derived from (with many thanks):
+ *   arch/m68knommu
+ *   arch/blackfin
+ *   arch/parisc
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/hw_random.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+#include <asm/ip5000.h>
+
+#define MODULE_NAME "ubicom32_rng"
+
+static int ubicom32_rng_data_present(struct hwrng *rng, int wait)
+{
+	int data, i;
+
+	for (i = 0; i < 20; i++) {
+		data = *(int *)(TIMER_BASE + TIMER_TRN);
+		if (data || !wait)
+			break;
+		udelay(10);
+	}
+	return data;
+}
+
+static int ubicom32_rng_data_read(struct hwrng *rng, u32 *data)
+{
+	*data = *(int *)(TIMER_BASE + TIMER_TRN);
+	return 4;
+}
+
+static int ubicom32_rng_init(struct hwrng *rng)
+{
+	printk(KERN_INFO "ubicom32 rng init\n");
+	*(int *)(TIMER_BASE + TIMER_TRN_CFG) = TIMER_TRN_CFG_ENABLE_OSC;
+	return 0;
+}
+
+static void ubicom32_rng_cleanup(struct hwrng *rng)
+{
+	printk(KERN_INFO "ubicom32 rng cleanup\n");
+	*(int *)(TIMER_BASE + TIMER_TRN_CFG) = 0;
+}
+
+static struct hwrng ubicom32_rng = {
+	.name		= MODULE_NAME,
+	.init		= ubicom32_rng_init,
+	.cleanup	= ubicom32_rng_cleanup,
+	.data_present	= ubicom32_rng_data_present,
+	.data_read	= ubicom32_rng_data_read,
+	.priv		= 0,
+};
+
+static int __init mod_init(void)
+{
+	int err;
+
+	printk(KERN_INFO "ubicom32 rng started\n");
+	err = hwrng_register(&ubicom32_rng);
+	if (err) {
+		printk(KERN_ERR "ubicom32 rng register failed (%d)\n",
+			err);
+	}
+
+	return err;
+}
+
+static void __exit mod_exit(void)
+{
+	printk(KERN_INFO "ubicom32 rng stopped\n");
+	hwrng_unregister(&ubicom32_rng);
+}
+
+module_init(mod_init);
+module_exit(mod_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ubicom, Inc.");
+MODULE_DESCRIPTION("H/W rng driver for ubicom32 processor");
+MODULE_VERSION("1:1.0.a");