1 /***********************license start***********************************
2 * Copyright (c) 2003-2017 Cavium Inc. ([email protected]). All rights
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5 *
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11 * notice, this list of conditions and the following disclaimer.
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14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
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21 * permission.
22 *
23 * This Software, including technical data, may be subject to U.S. export
24 * control laws, including the U.S. Export Administration Act and its
25 * associateint bdk_rng_init(bdk_node_t node)
26 * d regulations, and may be subject to export or import
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39 ***********************license end**************************************/
40 #include <bdk.h>
41 #include "libbdk-arch/bdk-csrs-pccpf.h"
42 #include "libbdk-arch/bdk-csrs-rnm.h"
43
44 #include <libbdk-hal/bdk-rng.h>
45 #include <libbdk-hal/device/bdk-device.h>
46 #define RNG_DEVID ((BDK_PCC_PROD_E_GEN << 24) | BDK_PCC_VENDOR_E_CAVIUM | (BDK_PCC_DEV_IDL_E_RNM << 16))
47
48 BDK_REQUIRE_DEFINE(RNM);
49
50 /**
51 * Reads 8 bits of random data from Random number generator
52 *
53 * @return random data
54 */
bdk_rng_get_random8(void)55 uint8_t bdk_rng_get_random8(void)
56 {
57
58 return bdk_read64_uint8(bdk_numa_get_address(bdk_numa_local(), BDK_RNM_RANDOM));
59 }
60
61 /**
62 * Reads 16 bits of random data from Random number generator
63 *
64 * @return random data
65 */
bdk_rng_get_random16(void)66 uint16_t bdk_rng_get_random16(void)
67 {
68 return bdk_read64_uint16(bdk_numa_get_address(bdk_numa_local(), BDK_RNM_RANDOM));
69 }
70
71 /**
72 * Reads 32 bits of random data from Random number generator
73 *
74 * @return random data
75 */
bdk_rng_get_random32(void)76 uint32_t bdk_rng_get_random32(void)
77 {
78 return bdk_read64_uint32(bdk_numa_get_address(bdk_numa_local(), BDK_RNM_RANDOM));
79 }
80
81 /**
82 * Reads 64 bits of random data from Random number generator
83 *
84 * @return random data
85 */
bdk_rng_get_random64(void)86 uint64_t bdk_rng_get_random64(void)
87 {
88 return bdk_read64_uint64(bdk_numa_get_address(bdk_numa_local(), BDK_RNM_RANDOM));
89 }
90
91 /**
92 * RNM init() function
93 *
94 * @param device RNM to initialize
95 *
96 * @return Zero on success, negative on failure
97 */
bdk_rng_init(bdk_node_t node)98 int bdk_rng_init(bdk_node_t node)
99 {
100 const bdk_device_t *device = bdk_device_lookup(node, RNG_DEVID, 0);
101 if (!device)
102 {
103 bdk_error("RNM: ECAM device not found\n");
104 return -1;
105 }
106 BDK_BAR_MODIFY(c, device, BDK_RNM_CTL_STATUS,
107 c.s.ent_en = 1;
108 c.s.rng_en = 1);
109 /* Read back after enable so we know it is done. Needed on t88 pass 2.0 emulator and t81 real hardware !!!! */
110 BDK_BAR_READ(device, BDK_RNM_CTL_STATUS);
111
112 /* Errata (RNM-22528) First consecutive reads to RNM_RANDOM return same
113 value. Before using the random entropy, read RNM_RANDOM at least once
114 and discard the data */
115 bdk_rng_get_random64();
116 return 0;
117 }
118
119