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authorblogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>2012-10-05 10:12:53 +0000
committerblogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>2012-10-05 10:12:53 +0000
commit5c105d9f3fd086aff195d3849dcf847d6b0bd927 (patch)
tree1229a11f725bfa58aa7c57a76898553bb5f6654a /target/linux/ubicom32/files/drivers/char
downloadopenwrt-5c105d9f3fd086aff195d3849dcf847d6b0bd927.tar.gz
openwrt-5c105d9f3fd086aff195d3849dcf847d6b0bd927.zip
branch Attitude Adjustment
git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@33625 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/ubicom32/files/drivers/char')
-rw-r--r--target/linux/ubicom32/files/drivers/char/hw_random/ubicom32-rng.c105
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 000000000..e42958989
--- /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");