powerpc/pseries: Implement arch_get_random_long() based on H_RANDOM

[karo-tx-linux.git] / arch / powerpc / platforms / pseries / rng.c

diff --git a/arch/powerpc/platforms/pseries/rng.c b/arch/powerpc/platforms/pseries/rng.c
new file mode 100644 (file)
index 0000000..a702f1c
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/rng.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2013, Michael Ellerman, IBM Corporation.
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt)    "pseries-rng: " fmt
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <asm/archrandom.h>
+#include <asm/machdep.h>
+
+
+static int pseries_get_random_long(unsigned long *v)
+{
+       unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+
+       if (plpar_hcall(H_RANDOM, retbuf) == H_SUCCESS) {
+               *v = retbuf[0];
+               return 1;
+       }
+
+       return 0;
+}
+
+static __init int rng_init(void)
+{
+       struct device_node *dn;
+
+       dn = of_find_compatible_node(NULL, NULL, "ibm,random");
+       if (!dn)
+               return -ENODEV;
+
+       pr_info("Registering arch random hook.\n");
+
+       ppc_md.get_random_long = pseries_get_random_long;
+
+       return 0;
+}
+subsys_initcall(rng_init);