ibex.c

// Copyright lowRISC contributors (OpenTitan project).
// Licensed under the Apache License, Version 2.0, see LICENSE for details.
// SPDX-License-Identifier: Apache-2.0
 
#include "sw/device/lib/crypto/drivers/ibex.h"
 
#include "sw/device/lib/base/abs_mmio.h"
#include "sw/device/lib/base/bitfield.h"
#include "sw/device/lib/base/csr.h"
#include "sw/device/lib/crypto/impl/status.h"
#include "sw/device/silicon_creator/lib/base/sec_mmio.h"
 
#include "hw/top_earlgrey/sw/autogen/top_earlgrey.h"
#include "rv_core_ibex_regs.h"
 
enum {
  kBase = TOP_EARLGREY_RV_CORE_IBEX_CFG_BASE_ADDR,
};
 
status_t ibex_wait_rnd_valid(void) {
  while (true) {
    uint32_t reg = abs_mmio_read32(kBase + RV_CORE_IBEX_RND_STATUS_REG_OFFSET);
    if (bitfield_bit32_read(reg, RV_CORE_IBEX_RND_STATUS_RND_DATA_VALID_BIT)) {
      return OTCRYPTO_OK;
    }
  }
}
 
status_t ibex_rnd_status_read(uint32_t *rnd_status) {
  *rnd_status = abs_mmio_read32(kBase + RV_CORE_IBEX_RND_STATUS_REG_OFFSET);
  return OTCRYPTO_OK;
}
 
status_t ibex_rnd_data_read(uint32_t *rnd_data) {
  *rnd_data = abs_mmio_read32(kBase + RV_CORE_IBEX_RND_DATA_REG_OFFSET);
  return OTCRYPTO_OK;
}