sw/device/tests/clkmgr_off_video_clk_test.c

/*
 * Copyright 2023 Google LLC
 * Copyright lowRISC contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// This test checks that when video_clk is disabled, the corresponding output
// signal from clkmgr will be constant 0

#include "hw/top_matcha/sw/autogen/top_matcha.h"
#include "sw/device/lib/base/abs_mmio.h"
#include "sw/device/lib/base/memory.h"
#include "sw/device/lib/dif/dif_aon_timer.h"
#include "sw/device/lib/dif/dif_base.h"
#include "sw/device/lib/dif/dif_clkmgr.h"
#include "sw/device/lib/runtime/log.h"
#include "sw/device/lib/testing/aon_timer_testutils.h"
#include "sw/device/lib/testing/test_framework/check.h"
#include "sw/device/lib/testing/test_framework/ottf_main.h"

OTTF_DEFINE_TEST_CONFIG();

static dif_aon_timer_t aon_timer;

/**
 * Turn off the clock for 400us, then turn on
 * Check the result in chip_sw_clkmgr_off_peri_vseq
 */
static void test_gateable_clocks_off_without_reset(
    const dif_clkmgr_t *clkmgr, dif_clkmgr_gateable_clock_t clock) {
  // Make sure the clock for the unit is on.
  CHECK_DIF_OK(
      dif_clkmgr_gateable_clock_set_enabled(clkmgr, clock, kDifToggleEnabled));

  LOG_INFO("Testing gateable clock ...");

  // Disable the peripheral's clock.
  CHECK_DIF_OK(
      dif_clkmgr_gateable_clock_set_enabled(clkmgr, clock, kDifToggleDisabled));
  // Wait for the clock to really turn off.
  busy_spin_micros(400);
  // Enalbe the clock
  CHECK_DIF_OK(
      dif_clkmgr_gateable_clock_set_enabled(clkmgr, clock, kDifToggleEnabled));
}

bool test_main(void) {
  dif_clkmgr_t clkmgr;

  CHECK_DIF_OK(dif_clkmgr_init(
      mmio_region_from_addr(TOP_MATCHA_CLKMGR_AON_BASE_ADDR), &clkmgr));

  // Initialize aon timer.
  CHECK_DIF_OK(dif_aon_timer_init(
      mmio_region_from_addr(TOP_MATCHA_AON_TIMER_AON_BASE_ADDR), &aon_timer));

  test_gateable_clocks_off_without_reset(&clkmgr,
                                         kTopMatchaGateableClocksVideoPeri);
  return true;
}