138 lines
4.9 KiB
C
138 lines
4.9 KiB
C
/****************************************************************************
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* arch/arm/src/tiva/tiva_sysctrl.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_ARM_SRC_TIVA_TIVA_SYSCTRL_H
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#define __ARCH_ARM_SRC_TIVA_TIVA_SYSCTRL_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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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifdef CONFIG_ARCH_CHIP_TM4C129
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/* Helpers for use with the TM4C129 version of tiva_clock_reconfigure() */
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# define M2PLLFREQ0(mint,mfrac) \
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((uint32_t)((mint) << SYSCON_PLLFREQ0_MINT_SHIFT) | \
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(uint32_t)((mfrac) << SYSCON_PLLFREQ0_MFRAC_SHIFT))
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# define QN2PLLFREQ1(q,n) \
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((uint32_t)(((n) - 1) << SYSCON_PLLFREQ1_N_SHIFT) | \
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(uint32_t)(((q) - 1) << SYSCON_PLLFREQ1_Q_SHIFT))
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Inline Functions
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****************************************************************************/
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#ifndef __ASSEMBLY__
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#if defined(__cplusplus)
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extern "C"
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{
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#if defined(CONFIG_ARCH_CHIP_TM4C129)
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/****************************************************************************
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* Name: tiva_clock_reconfigure
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*
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* Description:
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* Called to change to new clock based on desired pllfreq0, pllfreq1, and
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* sysdiv settings. This is use to set up the initial clocking but can be
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* used later to support slow clocked, low power consumption modes.
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*
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* The pllfreq0 and pllfreq1 settings derive from the PLL M, N, and Q
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* values to generate Fvco like:
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*
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* Fin = Fxtal / Q / N -OR- Fpiosc / Q / N
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* Mdiv = Mint + (MFrac / 1024)
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* Fvco = Fin * Mdiv
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*
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* When the PLL is active, the system clock frequency (SysClk) is
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* calculated using the following equation:
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*
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* SysClk = Fvco/ sysdiv
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*
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* NOTE: The input clock to the PLL may be either the external crystal
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* (Fxtal) or PIOSC (Fpiosc). This logic supports only the external
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* crystal as the PLL source clock.
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*
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* Input Parameters:
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* pllfreq0 - PLLFREQ0 register value (see helper macro M2PLLFREQ0()
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* pllfreq1 - PLLFREQ1 register value (see helper macro QN2PLLFREQ1()
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* sysdiv - Fvco divider value
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*
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* Returned Value:
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* The resulting SysClk frequency
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*
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****************************************************************************/
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uint32_t tiva_clock_reconfigure(uint32_t pllfreq0, uint32_t pllfreq1,
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uint32_t sysdiv);
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#else
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/****************************************************************************
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* Name: tiva_clock_reconfigure
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*
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* Description:
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* Called to change to new clock based on desired rcc and rcc2 settings.
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* This is use to set up the initial clocking but can be used later to
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* support slow clocked, low power consumption modes.
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*
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****************************************************************************/
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void tiva_clock_reconfigure(uint32_t newrcc, uint32_t newrcc2);
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#endif
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/****************************************************************************
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* Name: tiva_clock_configure
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*
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* Description:
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* Called early in the boot sequence (before .data and .bss are available)
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* in order to configure initial clocking.
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*
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****************************************************************************/
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void tiva_clock_configure(void);
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ARCH_ARM_SRC_TIVA_TIVA_SYSCTRL_H */
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