MIPS: Octeon: Add hardware RNG platform device.

Add a platform device for the Octeon Random Number Generator (RNG).

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/arch/mips/cavium-octeon/setup.c b/arch/mips/cavium-octeon/setup.c
index da559249cc2f..468a1209833f 100644
--- a/arch/mips/cavium-octeon/setup.c
+++ b/arch/mips/cavium-octeon/setup.c
@@ -33,6 +33,7 @@
 #include <asm/time.h>
 
 #include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-rnm-defs.h>
 
 #ifdef CONFIG_CAVIUM_DECODE_RSL
 extern void cvmx_interrupt_rsl_decode(void);
@@ -926,3 +927,45 @@ out:
         return ret;
 }
 device_initcall(octeon_cf_device_init);
+
+/* Octeon Random Number Generator.  */
+static int __init octeon_rng_device_init(void)
+{
+        struct platform_device *pd;
+        int ret = 0;
+
+        struct resource rng_resources[] = {
+                {
+                        .flags  = IORESOURCE_MEM,
+                        .start  = XKPHYS_TO_PHYS(CVMX_RNM_CTL_STATUS),
+                        .end    = XKPHYS_TO_PHYS(CVMX_RNM_CTL_STATUS) + 0xf
+                }, {
+                        .flags  = IORESOURCE_MEM,
+                        .start  = cvmx_build_io_address(8, 0),
+                        .end    = cvmx_build_io_address(8, 0) + 0x7
+                }
+        };
+
+        pd = platform_device_alloc("octeon_rng", -1);
+        if (!pd) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        ret = platform_device_add_resources(pd, rng_resources,
+                                            ARRAY_SIZE(rng_resources));
+        if (ret)
+                goto fail;
+
+        ret = platform_device_add(pd);
+        if (ret)
+                goto fail;
+
+        return ret;
+fail:
+        platform_device_put(pd);
+
+out:
+        return ret;
+}
+device_initcall(octeon_rng_device_init);