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authorLinus Torvalds <torvalds@linux-foundation.org>2008-04-21 15:57:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-21 15:57:09 -0700
commit904e0ab54b7591b9cb01cfc0dbbedcc8bc0d949b (patch)
tree13a2fc98fc7b347fe0d18cc18d452f1f49bff582 /drivers/char/hw_random
parent98a1e95f9b5919b55c71a01546415074282d30d5 (diff)
parentc49a7f182c44c31ea460093eb263110824f6c98e (diff)
downloadop-kernel-dev-904e0ab54b7591b9cb01cfc0dbbedcc8bc0d949b.zip
op-kernel-dev-904e0ab54b7591b9cb01cfc0dbbedcc8bc0d949b.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: [HWRNG] omap: Minor updates [CRYPTO] kconfig: Ordering cleanup [CRYPTO] all: Clean up init()/fini() [CRYPTO] padlock-aes: Use generic setkey function [CRYPTO] aes: Export generic setkey [CRYPTO] api: Make the crypto subsystem fully modular [CRYPTO] cts: Add CTS mode required for Kerberos AES support [CRYPTO] lrw: Replace all adds to big endians variables with be*_add_cpu [CRYPTO] tcrypt: Change the XTEA test vectors [CRYPTO] tcrypt: Shrink the tcrypt module [CRYPTO] tcrypt: Change the usage of the test vectors [CRYPTO] api: Constify function pointer tables [CRYPTO] aes-x86-32: Remove unused return code [CRYPTO] tcrypt: Shrink speed templates [CRYPTO] tcrypt: Group common speed templates [CRYPTO] sha512: Rename sha512 to sha512_generic [CRYPTO] sha384: Hardware acceleration for s390 [CRYPTO] sha512: Hardware acceleration for s390 [CRYPTO] s390: Generic sha_update and sha_final [CRYPTO] api: Switch to proc_create()
Diffstat (limited to 'drivers/char/hw_random')
-rw-r--r--drivers/char/hw_random/omap-rng.c26
1 files changed, 13 insertions, 13 deletions
diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index 7e31995..51738bd 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -1,7 +1,5 @@
/*
- * drivers/char/hw_random/omap-rng.c
- *
- * RNG driver for TI OMAP CPU family
+ * omap-rng.c - RNG driver for TI OMAP CPU family
*
* Author: Deepak Saxena <dsaxena@plexity.net>
*
@@ -15,11 +13,6 @@
* 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.
- *
- * TODO:
- *
- * - Make status updated be interrupt driven so we don't poll
- *
*/
#include <linux/module.h>
@@ -55,17 +48,16 @@ static void __iomem *rng_base;
static struct clk *rng_ick;
static struct platform_device *rng_dev;
-static u32 omap_rng_read_reg(int reg)
+static inline u32 omap_rng_read_reg(int reg)
{
return __raw_readl(rng_base + reg);
}
-static void omap_rng_write_reg(int reg, u32 val)
+static inline void omap_rng_write_reg(int reg, u32 val)
{
__raw_writel(val, rng_base + reg);
}
-/* REVISIT: Does the status bit really work on 16xx? */
static int omap_rng_data_present(struct hwrng *rng, int wait)
{
int data, i;
@@ -74,6 +66,11 @@ static int omap_rng_data_present(struct hwrng *rng, int wait)
data = omap_rng_read_reg(RNG_STAT_REG) ? 0 : 1;
if (data || !wait)
break;
+ /* RNG produces data fast enough (2+ MBit/sec, even
+ * during "rngtest" loads, that these delays don't
+ * seem to trigger. We *could* use the RNG IRQ, but
+ * that'd be higher overhead ... so why bother?
+ */
udelay(10);
}
return data;
@@ -101,7 +98,8 @@ static int __init omap_rng_probe(struct platform_device *pdev)
* A bit ugly, and it will never actually happen but there can
* be only one RNG and this catches any bork
*/
- BUG_ON(rng_dev);
+ if (rng_dev)
+ return -EBUSY;
if (cpu_is_omap24xx()) {
rng_ick = clk_get(NULL, "rng_ick");
@@ -124,7 +122,7 @@ static int __init omap_rng_probe(struct platform_device *pdev)
return -EBUSY;
dev_set_drvdata(&pdev->dev, mem);
- rng_base = (u32 __iomem *)io_p2v(res->start);
+ rng_base = (u32 __force __iomem *)io_p2v(res->start);
ret = hwrng_register(&omap_rng_ops);
if (ret) {
@@ -182,6 +180,8 @@ static int omap_rng_resume(struct platform_device *pdev)
#endif
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:omap_rng");
static struct platform_driver omap_rng_driver = {
.driver = {
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