ULP: add functions for stopping/restarting the ulp-riscv

Closes https://github.com/espressif/esp-idf/issues/8232

components/ulp/ulp_riscv/ulp_riscv_utils.c

@@ -1,16 +1,8 @@
-// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
-//
-// 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.
+/*
+ * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 
 #include "ulp_riscv/ulp_riscv.h"
 #include "ulp_riscv/ulp_riscv_utils.h"
@@ -26,7 +18,7 @@ void ulp_riscv_wakeup_main_processor(void)
     SET_PERI_REG_MASK(RTC_CNTL_STATE0_REG, RTC_CNTL_SW_CPU_INT);
 }
 
-void ulp_riscv_shutdown(void)
+void ulp_riscv_halt(void)
 {
     /* Setting the delay time after RISCV recv `DONE` signal, Ensure that action `RESET` can be executed in time. */
     REG_SET_FIELD(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SHUT_2_CLK_DIS, 0x3F);
@@ -48,3 +40,13 @@ void ulp_riscv_delay_cycles(uint32_t cycles)
         /* Wait */
     }
 }
+
+void ulp_riscv_timer_stop(void)
+{
+    CLEAR_PERI_REG_MASK(RTC_CNTL_ULP_CP_TIMER_REG, RTC_CNTL_ULP_CP_SLP_TIMER_EN);
+}
+
+void ulp_riscv_timer_resume(void)
+{
+    SET_PERI_REG_MASK(RTC_CNTL_ULP_CP_TIMER_REG, RTC_CNTL_ULP_CP_SLP_TIMER_EN);
+}