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/************************************************************************************
* arch/arm/src/tiva/tiva_syscontrol.h
*
* Copyright (C) 2009-2010, 2013-2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************************************/
#ifndef __ARCH_ARM_SRC_TIVA_TIVA_SYSCONTROL_H
#define __ARCH_ARM_SRC_TIVA_TIVA_SYSCONTROL_H
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
#ifdef CONFIG_ARCH_CHIP_TM4C129
/* Helpers for use with the TM4C129 version of tiva_clockconfig() */
# define M2PLLFREQ0(mint,mfrac) \
((uint32_t)((mint) << SYSCON_PLLFREQ0_MINT_SHIFT) | \
(uint32_t)((mfrac) << SYSCON_PLLFREQ0_MFRAC_SHIFT))
# define QN2PLLFREQ1(q,n) \
((uint32_t)(((n) - 1) << SYSCON_PLLFREQ1_N_SHIFT) | \
(uint32_t)(((q) - 1) << SYSCON_PLLFREQ1_Q_SHIFT))
#endif
/************************************************************************************
* Public Types
************************************************************************************/
/************************************************************************************
* Inline Functions
************************************************************************************/
#ifndef __ASSEMBLY__
/************************************************************************************
* Public Data
************************************************************************************/
#if defined(__cplusplus)
extern "C"
{
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef CONFIG_ARCH_CHIP_TM4C129
/****************************************************************************
* Name: tiva_clockconfig
*
* Description:
* Called to change to new clock based on desired pllfreq0, pllfreq1, and
* sysdiv settings. This is use to set up the initial clocking but can be
* used later to support slow clocked, low power consumption modes.
*
* The pllfreq0 and pllfreq1 settings derive from the PLL M, N, and Q
* values to generate Fvco like:
*
* Fin = Fxtal / Q / N -OR- Fpiosc / Q / N
* Mdiv = Mint + (MFrac / 1024)
* Fvco = Fin * Mdiv
*
* When the PLL is active, the system clock frequency (SysClk) is
* calculated using the following equation:
*
* SysClk = Fvco/ sysdiv
*
* NOTE: The input clock to the PLL may be either the external crystal
* (Fxtal) or PIOSC (Fpiosc). This logic supports only the external
* crystal as the PLL source clock.
*
* Input Parameters:
* pllfreq0 - PLLFREQ0 register value (see helper macro M2PLLFREQ0()
* pllfreq1 - PLLFREQ1 register value (see helper macro QN2PLLFREQ1()
* sysdiv - Fvco divider value
*
* Returned Value:
* The resulting SysClk frequency
*
****************************************************************************/
uint32_t tiva_clockconfig(uint32_t pllfreq0, uint32_t pllfreq1, uint32_t sysdiv);
#else
/****************************************************************************
* Name: tiva_clockconfig
*
* Description:
* Called to change to new clock based on desired rcc and rcc2 settings.
* This is use to set up the initial clocking but can be used later to
* support slow clocked, low power consumption modes.
*
****************************************************************************/
void tiva_clockconfig(uint32_t newrcc, uint32_t newrcc2);
#endif
/****************************************************************************
* Name: up_clockconfig
*
* Description:
* Called early in the boot sequence (before .data and .bss are available)
* in order to configure initial clocking.
*
****************************************************************************/
void up_clockconfig(void);
#if defined(__cplusplus)
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_ARM_SRC_TIVA_TIVA_SYSCONTROL_H */
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