device_sim_qemu.c

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// Copyright lowRISC contributors (OpenTitan project).
// Licensed under the Apache License, Version 2.0, see LICENSE for details.
// SPDX-License-Identifier: Apache-2.0
 
#include <stdbool.h>
 
#include "dt/dt_rv_core_ibex.h"  // Generated
#include "sw/device/lib/arch/device.h"
#include "sw/device/lib/base/macros.h"
#include "sw/device/silicon_creator/lib/drivers/ibex.h"
#include "sw/device/silicon_creator/lib/drivers/uart.h"
 
#include "rv_core_ibex_regs.h"  // Generated
#include "uart_regs.h"          // Generated
 
// Use the first dt_rv_core_ibex_t enum, i.e. the first Ibex core instance.
static const dt_rv_core_ibex_t kRvCoreIbexDt = (dt_rv_core_ibex_t)0;
static_assert(kDtRvCoreIbexCount == 1, "Only single core tops are supported");
 
static inline uintptr_t rv_core_ibex_base(void) {
  return (uintptr_t)dt_rv_core_ibex_primary_reg_block(kRvCoreIbexDt);
}
 
/**
 * @file
 * @brief Device-specific symbol definitions for the QEMU emulation.
 */
 
const device_type_t kDeviceType = kDeviceSimQemu;
 
const uint64_t kClockFreqCpuMhz = 24;
 
const uint64_t kClockFreqCpuHz = kClockFreqCpuMhz * 1000 * 1000;
 
uint64_t to_cpu_cycles(uint64_t usec) { return usec * kClockFreqCpuMhz; }
 
const uint64_t kClockFreqHiSpeedPeripheralHz = 24 * 1000 * 1000;  // 24MHz
 
const uint64_t kClockFreqPeripheralHz = 6 * 1000 * 1000;  // 6MHz
 
const uint64_t kClockFreqUsbHz = 48 * 1000 * 1000;  // 48MHz
 
const uint64_t kClockFreqAonHz = 250 * 1000;  // 250kHz
 
const uint64_t kUartBaudrate = 115200;
 
const uint32_t kUartNCOValue =
    CALCULATE_UART_NCO(kUartBaudrate, kClockFreqPeripheralHz);
 
const uint32_t kUartBaud115K =
    CALCULATE_UART_NCO(115200, kClockFreqPeripheralHz);
const uint32_t kUartBaud230K =
    CALCULATE_UART_NCO(115200 * 2, kClockFreqPeripheralHz);
const uint32_t kUartBaud460K =
    CALCULATE_UART_NCO(115200 * 4, kClockFreqPeripheralHz);
const uint32_t kUartBaud921K =
    CALCULATE_UART_NCO(115200 * 8, kClockFreqPeripheralHz);
const uint32_t kUartBaud1M33 =
    CALCULATE_UART_NCO(1333333, kClockFreqPeripheralHz);
const uint32_t kUartBaud1M50 =
    CALCULATE_UART_NCO(1500000, kClockFreqPeripheralHz);
 
const uint32_t kUartTxFifoCpuCycles = CALCULATE_UART_TX_FIFO_CPU_CYCLES(
    kUartBaudrate, kClockFreqCpuHz, UART_PARAM_TX_FIFO_DEPTH);
 
const uint32_t kAstCheckPollCpuCycles =
    CALCULATE_AST_CHECK_POLL_CPU_CYCLES(kClockFreqCpuHz);
 
uintptr_t device_test_status_address(void) {
  return rv_core_ibex_base() + RV_CORE_IBEX_DV_SIM_WINDOW_REG_OFFSET;
}
 
uintptr_t device_log_bypass_uart_address(void) { return 0; }
 
// Although QEMU isn't an FPGA, there's no harm in us printing the version here.
void device_fpga_version_print(void) {
  uint32_t version = ibex_fpga_version();
  //                       : M O R
  const uint32_t kRom = 0x3a4d4f52;
  uart_write_imm(kRom);
  // The cast to unsigned int stops GCC from complaining about uint32_t
  // being a `long unsigned int` while the %x specifier takes `unsigned int`.
  const uint32_t kNewline = 0x0a0d;
  uart_write_hex(version, sizeof(version), kNewline);
}