137 lines
5.4 KiB
C
137 lines
5.4 KiB
C
/****************************************************************************
|
|
* arch/arm/src/sama5/sam_clockconfig.h
|
|
*
|
|
* Copyright (C) 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_SAMA5_SAM_CLOCKCONFIG_H
|
|
#define __ARCH_ARM_SRC_SAMA5_SAM_CLOCKCONFIG_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include "up_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Inline Functions
|
|
****************************************************************************/
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: sam_clockconfig
|
|
*
|
|
* Description:
|
|
* Called to initialize the SAM3/4. This does whatever setup is needed to
|
|
* put the SoC in a usable state. This includes the initialization of
|
|
* clocking using the settings in board.h.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void __ramfunc__ sam_clockconfig(void);
|
|
|
|
/****************************************************************************
|
|
* Name: board_norflash_config
|
|
*
|
|
* Description:
|
|
* If CONFIG_SAMA5_BOOT_CS0FLASH, then the system is boot directly off
|
|
* CS0 NOR FLASH. In this case, we assume that we get here from the
|
|
* primary boot loader under these conditions:
|
|
*
|
|
* "If BMS signal is tied to 0, BMS_BIT is read at 1. The ROM Code
|
|
* allows execution of the code contained into the memory connected to
|
|
* Chip Select 0 of the External Bus Interface.
|
|
*
|
|
* "To achieve that, the following sequence is preformed by the ROM
|
|
* Code:
|
|
*
|
|
* - The main clock is the on-chip 12 MHz RC oscillator,
|
|
* - The Static Memory Controller is configured with timing allowing
|
|
* code execution inCS0 external memory at 12 MHz
|
|
* - AXI matrix is configured to remap EBI CS0 address at 0x0
|
|
* - 0x0 is loaded in the Program Counter register
|
|
*
|
|
* "The user software in the external memory must perform the next
|
|
* operation in order to complete the clocks and SMC timings
|
|
* configuration to run at a higher clock frequency:
|
|
*
|
|
* - Enable the 32768 Hz oscillator if best accuracy is needed
|
|
* - Reprogram the SMC setup, cycle, hold, mode timing registers
|
|
* for EBI CS0, to adapt them to the new clock
|
|
* - Program the PMC (Main Oscillator Enable or Bypass mode)
|
|
* - Program and Start the PLL
|
|
* - Switch the system clock to the new value"
|
|
*
|
|
* This function provides the board-specific implementation of the logic
|
|
* to reprogram the SMC.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_SAMA5_BOOT_CS0FLASH
|
|
void board_norflash_config(void);
|
|
#endif
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* __ARCH_ARM_SRC_SAMA5_SAM_CLOCKCONFIG_H */
|