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Diffstat (limited to 'arch/powerpc/platforms/powernv/rng.c')
-rw-r--r--arch/powerpc/platforms/powernv/rng.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c
index 80db43944afe..6eb808ff637e 100644
--- a/arch/powerpc/platforms/powernv/rng.c
+++ b/arch/powerpc/platforms/powernv/rng.c
@@ -24,12 +24,22 @@
24 24
25struct powernv_rng { 25struct powernv_rng {
26 void __iomem *regs; 26 void __iomem *regs;
27 void __iomem *regs_real;
27 unsigned long mask; 28 unsigned long mask;
28}; 29};
29 30
30static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng); 31static DEFINE_PER_CPU(struct powernv_rng *, powernv_rng);
31 32
32 33
34int powernv_hwrng_present(void)
35{
36 struct powernv_rng *rng;
37
38 rng = get_cpu_var(powernv_rng);
39 put_cpu_var(rng);
40 return rng != NULL;
41}
42
33static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val) 43static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val)
34{ 44{
35 unsigned long parity; 45 unsigned long parity;
@@ -46,6 +56,17 @@ static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val)
46 return val; 56 return val;
47} 57}
48 58
59int powernv_get_random_real_mode(unsigned long *v)
60{
61 struct powernv_rng *rng;
62
63 rng = raw_cpu_read(powernv_rng);
64
65 *v = rng_whiten(rng, in_rm64(rng->regs_real));
66
67 return 1;
68}
69
49int powernv_get_random_long(unsigned long *v) 70int powernv_get_random_long(unsigned long *v)
50{ 71{
51 struct powernv_rng *rng; 72 struct powernv_rng *rng;
@@ -80,12 +101,20 @@ static __init void rng_init_per_cpu(struct powernv_rng *rng,
80static __init int rng_create(struct device_node *dn) 101static __init int rng_create(struct device_node *dn)
81{ 102{
82 struct powernv_rng *rng; 103 struct powernv_rng *rng;
104 struct resource res;
83 unsigned long val; 105 unsigned long val;
84 106
85 rng = kzalloc(sizeof(*rng), GFP_KERNEL); 107 rng = kzalloc(sizeof(*rng), GFP_KERNEL);
86 if (!rng) 108 if (!rng)
87 return -ENOMEM; 109 return -ENOMEM;
88 110
111 if (of_address_to_resource(dn, 0, &res)) {
112 kfree(rng);
113 return -ENXIO;
114 }
115
116 rng->regs_real = (void __iomem *)res.start;
117
89 rng->regs = of_iomap(dn, 0); 118 rng->regs = of_iomap(dn, 0);
90 if (!rng->regs) { 119 if (!rng->regs) {
91 kfree(rng); 120 kfree(rng);