/***********************license start*********************************** * Copyright (c) 2003-2017 Cavium Inc. (support@cavium.com). All rights * reserved. * * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * * Neither the name of Cavium Inc. nor the names of * its contributors may be used to endorse or promote products * derived from this software without specific prior written * permission. * * This Software, including technical data, may be subject to U.S. export * control laws, including the U.S. Export Administration Act and its * associateint bdk_rng_init(bdk_node_t node) * d regulations, and may be subject to export or import * regulations in other countries. * * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS" * AND WITH ALL FAULTS AND CAVIUM INC. MAKES NO PROMISES, REPRESENTATIONS OR * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT * TO THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY * REPRESENTATION OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT * DEFECTS, AND CAVIUM SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES * OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR * PURPOSE, LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, * QUIET POSSESSION OR CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK * ARISING OUT OF USE OR PERFORMANCE OF THE SOFTWARE LIES WITH YOU. ***********************license end**************************************/ #include <bdk.h> #include "libbdk-arch/bdk-csrs-pccpf.h" #include "libbdk-arch/bdk-csrs-rnm.h" #include <libbdk-hal/bdk-rng.h> #include <libbdk-hal/device/bdk-device.h> #define RNG_DEVID ((BDK_PCC_PROD_E_GEN << 24) | BDK_PCC_VENDOR_E_CAVIUM | (BDK_PCC_DEV_IDL_E_RNM << 16)) BDK_REQUIRE_DEFINE(RNM); /** * Reads 8 bits of random data from Random number generator * * @return random data */ uint8_t bdk_rng_get_random8(void) { return bdk_read64_uint8(bdk_numa_get_address(bdk_numa_local(), BDK_RNM_RANDOM)); } /** * Reads 16 bits of random data from Random number generator * * @return random data */ uint16_t bdk_rng_get_random16(void) { return bdk_read64_uint16(bdk_numa_get_address(bdk_numa_local(), BDK_RNM_RANDOM)); } /** * Reads 32 bits of random data from Random number generator * * @return random data */ uint32_t bdk_rng_get_random32(void) { return bdk_read64_uint32(bdk_numa_get_address(bdk_numa_local(), BDK_RNM_RANDOM)); } /** * Reads 64 bits of random data from Random number generator * * @return random data */ uint64_t bdk_rng_get_random64(void) { return bdk_read64_uint64(bdk_numa_get_address(bdk_numa_local(), BDK_RNM_RANDOM)); } /** * RNM init() function * * @param device RNM to initialize * * @return Zero on success, negative on failure */ int bdk_rng_init(bdk_node_t node) { const bdk_device_t *device = bdk_device_lookup(node, RNG_DEVID, 0); if (!device) { bdk_error("RNM: ECAM device not found\n"); return -1; } BDK_BAR_MODIFY(c, device, BDK_RNM_CTL_STATUS, c.s.ent_en = 1; c.s.rng_en = 1); /* Read back after enable so we know it is done. Needed on t88 pass 2.0 emulator and t81 real hardware !!!! */ BDK_BAR_READ(device, BDK_RNM_CTL_STATUS); /* Errata (RNM-22528) First consecutive reads to RNM_RANDOM return same value. Before using the random entropy, read RNM_RANDOM at least once and discard the data */ bdk_rng_get_random64(); return 0; }