IXP4xx: HW pseudo-random generator is available on IXP45x/46x only.

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>

2 files changed, 7 insertions, 4 deletions

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index fbd9b2b850e..c58ea9b80b1 100644
--- 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.
diff --git a/drivers/char/hw_random/ixp4xx-rng.c b/drivers/char/hw_random/ixp4xx-rng.c
index 263567f5f39..beec1627db3 100644
--- 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");