6 #define pr_fmt(fmt)	"powernv-rng: " fmt
34 	struct powernv_rng *rng;  in powernv_hwrng_present()  local
36 	rng = get_cpu_var(powernv_rng);  in powernv_hwrng_present()
37 	put_cpu_var(rng);  in powernv_hwrng_present()
38 	return rng != NULL;  in powernv_hwrng_present()
41 static unsigned long rng_whiten(struct powernv_rng *rng, unsigned long val)  in rng_whiten()  argument
49 	val ^= rng->mask;  in rng_whiten()
52 	rng->mask = (rng->mask << 1) | (parity & 1);  in rng_whiten()
59 	struct powernv_rng *rng;  in powernv_get_random_real_mode()  local
61 	rng = raw_cpu_read(powernv_rng);  in powernv_get_random_real_mode()
63 	*v = rng_whiten(rng, __raw_rm_readq(rng->regs_real));  in powernv_get_random_real_mode()
105 	struct powernv_rng *rng;  in powernv_get_random_long()  local
107 	rng = get_cpu_var(powernv_rng);  in powernv_get_random_long()
109 	*v = rng_whiten(rng, in_be64(rng->regs));  in powernv_get_random_long()
111 	put_cpu_var(rng);  in powernv_get_random_long()
117 static __init void rng_init_per_cpu(struct powernv_rng *rng,  in rng_init_per_cpu()  argument
129 			per_cpu(powernv_rng, cpu) = rng;  in rng_init_per_cpu()
136 	struct powernv_rng *rng;  in rng_create()  local
140 	rng = kzalloc(sizeof(*rng), GFP_KERNEL);  in rng_create()
141 	if (!rng)  in rng_create()
145 		kfree(rng);  in rng_create()
149 	rng->regs_real = (void __iomem *)res.start;  in rng_create()
151 	rng->regs = of_iomap(dn, 0);  in rng_create()
152 	if (!rng->regs) {  in rng_create()
153 		kfree(rng);  in rng_create()
157 	val = in_be64(rng->regs);  in rng_create()
158 	rng->mask = val;  in rng_create()
160 	rng_init_per_cpu(rng, dn);  in rng_create()
174 	for_each_compatible_node(dn, NULL, "ibm,power-rng") {  in rng_init()
177 			pr_err("Failed creating rng for %pOF (%d).\n",  in rng_init()