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authorLinus Torvalds <torvalds@linux-foundation.org>2010-02-26 16:50:02 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-02-26 16:50:02 -0800
commit37d4008484977f60d5d37499a2670c79b214dd46 (patch)
treee73ef4b7c3eee1543e13d7be2ecb1593e77eb123 /drivers/char/hw_random
parent68c6b859846bd078b37c6ca5f3882032f129e72d (diff)
parent8d0c123f8b710561cfd34f6e1a5bebc27988edbe (diff)
downloadop-kernel-dev-37d4008484977f60d5d37499a2670c79b214dd46.zip
op-kernel-dev-37d4008484977f60d5d37499a2670c79b214dd46.tar.gz
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (31 commits) crypto: aes_generic - Fix checkpatch errors crypto: fcrypt - Fix checkpatch errors crypto: ecb - Fix checkpatch errors crypto: des_generic - Fix checkpatch errors crypto: deflate - Fix checkpatch errors crypto: crypto_null - Fix checkpatch errors crypto: cipher - Fix checkpatch errors crypto: crc32 - Fix checkpatch errors crypto: compress - Fix checkpatch errors crypto: cast6 - Fix checkpatch errors crypto: cast5 - Fix checkpatch errors crypto: camellia - Fix checkpatch errors crypto: authenc - Fix checkpatch errors crypto: api - Fix checkpatch errors crypto: anubis - Fix checkpatch errors crypto: algapi - Fix checkpatch errors crypto: blowfish - Fix checkpatch errors crypto: aead - Fix checkpatch errors crypto: ablkcipher - Fix checkpatch errors crypto: pcrypt - call the complete function on error ...
Diffstat (limited to 'drivers/char/hw_random')
-rw-r--r--drivers/char/hw_random/Kconfig12
-rw-r--r--drivers/char/hw_random/Makefile1
-rw-r--r--drivers/char/hw_random/nomadik-rng.c103
3 files changed, 116 insertions, 0 deletions
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index 8706026..6ea1014 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -186,3 +186,15 @@ config HW_RANDOM_MXC_RNGA
module will be called mxc-rnga.
If unsure, say Y.
+
+config HW_RANDOM_NOMADIK
+ tristate "ST-Ericsson Nomadik Random Number Generator support"
+ depends on HW_RANDOM && PLAT_NOMADIK
+ ---help---
+ This driver provides kernel-side support for the Random Number
+ Generator hardware found on ST-Ericsson SoCs (8815 and 8500).
+
+ To compile this driver as a module, choose M here: the
+ module will be called nomadik-rng.
+
+ If unsure, say Y.
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index 5eeb130..4273308 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -18,3 +18,4 @@ obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o
obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o
+obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o
diff --git a/drivers/char/hw_random/nomadik-rng.c b/drivers/char/hw_random/nomadik-rng.c
new file mode 100644
index 0000000..a8b4c40
--- /dev/null
+++ b/drivers/char/hw_random/nomadik-rng.c
@@ -0,0 +1,103 @@
+/*
+ * Nomadik RNG support
+ * Copyright 2009 Alessandro Rubini
+ *
+ * This program 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/amba/bus.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+
+static int nmk_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+ void __iomem *base = (void __iomem *)rng->priv;
+
+ /*
+ * The register is 32 bits and gives 16 random bits (low half).
+ * A subsequent read will delay the core for 400ns, so we just read
+ * once and accept the very unlikely very small delay, even if wait==0.
+ */
+ *(u16 *)data = __raw_readl(base + 8) & 0xffff;
+ return 2;
+}
+
+/* we have at most one RNG per machine, granted */
+static struct hwrng nmk_rng = {
+ .name = "nomadik",
+ .read = nmk_rng_read,
+};
+
+static int nmk_rng_probe(struct amba_device *dev, struct amba_id *id)
+{
+ void __iomem *base;
+ int ret;
+
+ ret = amba_request_regions(dev, dev->dev.init_name);
+ if (ret)
+ return ret;
+ ret = -ENOMEM;
+ base = ioremap(dev->res.start, resource_size(&dev->res));
+ if (!base)
+ goto out_release;
+ nmk_rng.priv = (unsigned long)base;
+ ret = hwrng_register(&nmk_rng);
+ if (ret)
+ goto out_unmap;
+ return 0;
+
+out_unmap:
+ iounmap(base);
+out_release:
+ amba_release_regions(dev);
+ return ret;
+}
+
+static int nmk_rng_remove(struct amba_device *dev)
+{
+ void __iomem *base = (void __iomem *)nmk_rng.priv;
+ hwrng_unregister(&nmk_rng);
+ iounmap(base);
+ amba_release_regions(dev);
+ return 0;
+}
+
+static struct amba_id nmk_rng_ids[] = {
+ {
+ .id = 0x000805e1,
+ .mask = 0x000fffff, /* top bits are rev and cfg: accept all */
+ },
+ {0, 0},
+};
+
+static struct amba_driver nmk_rng_driver = {
+ .drv = {
+ .owner = THIS_MODULE,
+ .name = "rng",
+ },
+ .probe = nmk_rng_probe,
+ .remove = nmk_rng_remove,
+ .id_table = nmk_rng_ids,
+};
+
+static int __init nmk_rng_init(void)
+{
+ return amba_driver_register(&nmk_rng_driver);
+}
+
+static void __devexit nmk_rng_exit(void)
+{
+ amba_driver_unregister(&nmk_rng_driver);
+}
+
+module_init(nmk_rng_init);
+module_exit(nmk_rng_exit);
+
+MODULE_LICENSE("GPL");
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