| // SPDX-License-Identifier: BSD-2-Clause |
| /* |
| * Copyright (c) 2019, Broadcom |
| */ |
| |
| #include <drivers/bcm_hwrng.h> |
| #include <io.h> |
| #include <kernel/pseudo_ta.h> |
| #include <trace.h> |
| |
| #define HWRNG_SERVICE_UUID \ |
| { 0x6272636D, 0x2019, 0x0201, \ |
| { 0x42, 0x43, 0x4D, 0x5F, 0x52, 0x4E, 0x47, 0x30 } } |
| |
| /* |
| * Get a HW generated random number |
| * |
| * [out] value[0].a: Generated 32-bit random number |
| */ |
| #define PTA_BCM_HWRNG_CMD_GET 0 |
| |
| #define HWRNG_TA_NAME "pta_hwrng.ta" |
| |
| static TEE_Result pta_hwrng_get(uint32_t param_types, |
| TEE_Param params[TEE_NUM_PARAMS]) |
| { |
| uint32_t num_words = 0; |
| uint32_t rnd_num = 0; |
| uint32_t res = 0; |
| uint32_t exp_param_types = TEE_PARAM_TYPES(TEE_PARAM_TYPE_VALUE_OUTPUT, |
| TEE_PARAM_TYPE_NONE, |
| TEE_PARAM_TYPE_NONE, |
| TEE_PARAM_TYPE_NONE); |
| |
| if (exp_param_types != param_types) { |
| EMSG("Invalid Param types"); |
| return TEE_ERROR_BAD_PARAMETERS; |
| } |
| |
| num_words = bcm_hwrng_read_rng(&rnd_num, 1); |
| |
| if (num_words < 1) { |
| res = TEE_ERROR_NO_DATA; |
| } else { |
| DMSG("Random Value is: 0x%08x", rnd_num); |
| params[0].value.a = rnd_num; |
| res = TEE_SUCCESS; |
| } |
| |
| return res; |
| } |
| |
| static TEE_Result invoke_command(void *session_context __unused, |
| uint32_t cmd_id, |
| uint32_t param_types, |
| TEE_Param params[TEE_NUM_PARAMS]) |
| { |
| TEE_Result res = TEE_SUCCESS; |
| |
| DMSG("command entry point[%d] for \"%s\"", cmd_id, HWRNG_TA_NAME); |
| |
| switch (cmd_id) { |
| case PTA_BCM_HWRNG_CMD_GET: |
| res = pta_hwrng_get(param_types, params); |
| break; |
| default: |
| EMSG("cmd: %d Not supported %s", cmd_id, HWRNG_TA_NAME); |
| res = TEE_ERROR_NOT_SUPPORTED; |
| break; |
| } |
| |
| return res; |
| } |
| |
| pseudo_ta_register(.uuid = HWRNG_SERVICE_UUID, |
| .name = HWRNG_TA_NAME, |
| .flags = PTA_DEFAULT_FLAGS, |
| .invoke_command_entry_point = invoke_command); |