48cf91a7be
This adds enablers for setting various clocks to some default values. Also, this provides helpers to grant nonsecure access to a number of clocks. Bootloader may utilize these to make the system boot in a deterministic manner. Signed-off-by: Eero Nurkkala <eero.nurkkala@offcode.fi>
123 lines
3.8 KiB
C
123 lines
3.8 KiB
C
/****************************************************************************
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* arch/arm64/src/imx9/imx9_ccm.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __ARCH_ARM64_SRC_IMX9_IMX9_CCM_H
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#define __ARCH_ARM64_SRC_IMX9_IMX9_CCM_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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/****************************************************************************
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* Name: imx9_ccm_configure_root_clock
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*
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* Description:
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* Change root clock source and divider. Leaves the clock running state
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* unaltered.
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*
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* Input Parameters:
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* root - The root clock index.
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* src - The root clock MUX source.
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* div - The root clock divider.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned on
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* failure.
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*
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****************************************************************************/
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int imx9_ccm_configure_root_clock(int root, int src, uint32_t div);
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/****************************************************************************
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* Name: imx9_ccm_root_clock_on
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*
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* Description:
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* Enable / disable root clock.
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*
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* Input Parameters:
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* root - The root clock index.
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* enabled - True enables the clock; false disables it.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned on
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* failure.
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*
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****************************************************************************/
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int imx9_ccm_root_clock_on(int root, bool enabled);
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/****************************************************************************
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* Name: imx9_ccm_gate_on
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*
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* Description:
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* Enable / disable clock.
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*
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* Input Parameters:
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* gate - The clock gate index.
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* enabled - True enables the clock; false disables it.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned on
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* failure.
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*
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****************************************************************************/
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int imx9_ccm_gate_on(int gate, bool enabled);
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/****************************************************************************
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* Name: imx9_ccm_shared_gpr_set
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*
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* Description:
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* Set shared gpr clock register value
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*
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* Input Parameters:
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* gpr - General purpose clock index
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* val - Value
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned on
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* failure.
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*
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****************************************************************************/
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int imx9_ccm_shared_gpr_set(uint32_t gpr, uint32_t val);
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/****************************************************************************
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* Name: imx9_ccm_clock_init
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*
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* Description:
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* Initializes bus clocks for a known default state.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* OK on success, a negated error value otherwise
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*
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****************************************************************************/
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int imx9_ccm_clock_init(void);
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#endif /* __ARCH_ARM64_SRC_IMX9_IMX9_CCM_H */
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