[PATCH 3/10] IXP4xx: HW pseudo-random generator is available on IXP45x/46x only.

Krzysztof Halasa
2012-09-20T20:17:52Z

--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -127,12 +127,12 @@ config HW_RANDOM_VIA
If unsure, say Y.

config HW_RANDOM_IXP4XX
- tristate "Intel IXP4xx NPU HW Random Number Generator support"
+ tristate "Intel IXP4xx NPU HW Pseudo-Random Number Generator support"
depends on HW_RANDOM && ARCH_IXP4XX
default HW_RANDOM
---help---
- This driver provides kernel-side support for the Random
- Number Generator hardware found on the Intel IXP4xx NPU.
+ This driver provides kernel-side support for the Pseudo-Random
+ Number Generator hardware found on the Intel IXP45x/46x NPU.

To compile this driver as a module, choose M here: the
module will be called ixp4xx-rng.
--- a/drivers/char/hw_random/ixp4xx-rng.c
+++ b/drivers/char/hw_random/ixp4xx-rng.c
@@ -45,6 +45,9 @@ static int __init ixp4xx_rng_init(void)
void __iomem * rng_base;
int err;

+ if (!cpu_is_ixp46x()) /* includes IXP455 */
+ return -ENOSYS;
+
rng_base = ioremap(0x70002100, 4);
if (!rng_base)
return -ENOMEM;
@@ -68,5 +71,5 @@ module_init(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_DESCRIPTION("H/W Pseudo-Random Number Generator (RNG) driver for IXP45x/46x");
MODULE_LICENSE("GPL");