1 files changed, 122 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c
new file mode 100644
index 000000000000..02db7d73cf8b
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/rng.c
@@ -0,0 +1,122 @@
+/*
+ * 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)     "powernv-rng: " fmt
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+#include <asm/archrandom.h>
+#include <asm/io.h>
+#include <asm/machdep.h>
+
+
+struct powernv_rng {
+        void __iomem *regs;
+        unsigned long mask;
+};
+
+static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng);
+
+
+static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val)
+{
+        unsigned long parity;
+
+        /* Calculate the parity of the value */
+        asm ("popcntd %0,%1" : "=r" (parity) : "r" (val));
+
+        /* xor our value with the previous mask */
+        val ^= rng->mask;
+
+        /* update the mask based on the parity of this value */
+        rng->mask = (rng->mask << 1) | (parity & 1);
+
+        return val;
+}
+
+int powernv_get_random_long(unsigned long *v)
+{
+        struct powernv_rng *rng;
+
+        rng = get_cpu_var(powernv_rng);
+
+        *v = rng_whiten(rng, in_be64(rng->regs));
+
+        put_cpu_var(rng);
+
+        return 1;
+}
+EXPORT_SYMBOL_GPL(powernv_get_random_long);
+
+static __init void rng_init_per_cpu(struct powernv_rng *rng,
+                                    struct device_node *dn)
+{
+        int chip_id, cpu;
+
+        chip_id = of_get_ibm_chip_id(dn);
+        if (chip_id == -1)
+                pr_warn("No ibm,chip-id found for %s.\n", dn->full_name);
+
+        for_each_possible_cpu(cpu) {
+                if (per_cpu(powernv_rng, cpu) == NULL ||
+                    cpu_to_chip_id(cpu) == chip_id) {
+                        per_cpu(powernv_rng, cpu) = rng;
+                }
+        }
+}
+
+static __init int rng_create(struct device_node *dn)
+{
+        struct powernv_rng *rng;
+        unsigned long val;
+
+        rng = kzalloc(sizeof(*rng), GFP_KERNEL);
+        if (!rng)
+                return -ENOMEM;
+
+        rng->regs = of_iomap(dn, 0);
+        if (!rng->regs) {
+                kfree(rng);
+                return -ENXIO;
+        }
+
+        val = in_be64(rng->regs);
+        rng->mask = val;
+
+        rng_init_per_cpu(rng, dn);
+
+        pr_info_once("Registering arch random hook.\n");
+
+        ppc_md.get_random_long = powernv_get_random_long;
+
+        return 0;
+}
+
+static __init int rng_init(void)
+{
+        struct device_node *dn;
+        int rc;
+
+        for_each_compatible_node(dn, NULL, "ibm,power-rng") {
+                rc = rng_create(dn);
+                if (rc) {
+                        pr_err("Failed creating rng for %s (%d).\n",
+                                dn->full_name, rc);
+                        continue;
+                }
+
+                /* Create devices for hwrng driver */
+                of_platform_device_create(dn, NULL, NULL);
+        }
+
+        return 0;
+}
+subsys_initcall(rng_init);