/************************************************************************************
* configs/olimex-stm32-p107/src/up_boot.c
* arch/arm/src/board/up_boot.c
*
* Copyright (C) 2009, 2012 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.
*
************************************************************************************/
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include <debug.h>
#include <arch/board/board.h>
#include "up_arch.h"
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: stm32_board_clockconfig
*
* Description:
* Any STM32 board may replace the "standard" board clock configuration logic with
* its own, custom clock cofiguration logic.
*
************************************************************************************/
#ifdef CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG
void stm32_board_clockconfig(void)
{
uint32_t regval;
regval = getreg32(STM32_RCC_CR);
regval &= ~RCC_CR_HSEBYP; /* Disable HSE clock bypass */
regval |= RCC_CR_HSEON; /* Enable HSE */
putreg32(regval, STM32_RCC_CR);
/* Set flash wait states
* Sysclk runs with 72MHz -> 2 waitstates.
* 0WS from 0-24MHz
* 1WS from 24-48MHz
* 2WS from 48-72MHz
*/
regval = getreg32(STM32_FLASH_ACR);
regval &= ~FLASH_ACR_LATENCY_MASK;
regval |= (FLASH_ACR_LATENCY_2|FLASH_ACR_PRTFBE);
putreg32(regval, STM32_FLASH_ACR);
regval = getreg32(STM32_RCC_CFGR2);
regval &= ~(RCC_CFGR2_PREDIV2_MASK
| RCC_CFGR2_PLL2MUL_MASK
| RCC_CFGR2_PREDIV1SRC_MASK
| RCC_CFGR2_PREDIV1_MASK);
regval |= RCC_CFGR2_PREDIV2d5; /* 25MHz / 5 */
regval |= RCC_CFGR2_PLL2MULx8; /* 5MHz * 8 => 40MHz */
regval |= RCC_CFGR2_PREDIV1SRC_PLL2; /* Use PLL2 as input for PREDIV1 */
regval |= RCC_CFGR2_PREDIV1d5; /* 40MHz / 5 => 8MHz */
putreg32(regval, STM32_RCC_CFGR2);
/* Set the PCLK2 divider */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~(RCC_CFGR_PPRE2_MASK | RCC_CFGR_HPRE_MASK);
regval |= STM32_RCC_CFGR_PPRE2;
regval |= RCC_CFGR_HPRE_SYSCLK;
putreg32(regval, STM32_RCC_CFGR);
/* Set the PCLK1 divider */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~RCC_CFGR_PPRE1_MASK;
regval |= STM32_RCC_CFGR_PPRE1;
putreg32(regval, STM32_RCC_CFGR);
regval = getreg32(STM32_RCC_CR);
regval |= RCC_CR_PLL2ON;
putreg32(regval, STM32_RCC_CR);
/* Wait for PLL2 ready */
while((getreg32(STM32_RCC_CR) & RCC_CR_PLL2RDY) == 0);
/* Setup PLL3 for RMII clock on MCO */
regval = getreg32(STM32_RCC_CFGR2);
regval &= ~(RCC_CFGR2_PLL3MUL_MASK);
regval |= RCC_CFGR2_PLL3MULx10;
putreg32(regval, STM32_RCC_CFGR2);
/* Switch PLL3 on */
regval = getreg32(STM32_RCC_CR);
regval |= RCC_CR_PLL3ON;
putreg32(regval, STM32_RCC_CR);
while ((getreg32(STM32_RCC_CR) & RCC_CR_PLL3RDY) == 0);
/* Set main PLL source 8MHz * 9 => 72MHz*/
regval = getreg32(STM32_RCC_CFGR);
regval &= ~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLMUL_MASK);
regval |= (RCC_CFGR_PLLSRC | RCC_CFGR_PLLMUL_CLKx9);
putreg32(regval, STM32_RCC_CFGR);
/* Switch main PLL on */
regval = getreg32(STM32_RCC_CR);
regval |= RCC_CR_PLLON;
putreg32(regval, STM32_RCC_CR);
while ((getreg32(STM32_RCC_CR) & RCC_CR_PLLRDY) == 0);
/* Select PLL as system clock source */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~RCC_CFGR_SW_MASK;
regval |= RCC_CFGR_SW_PLL;
putreg32(regval, STM32_RCC_CFGR);
/* Wait until PLL is used as the system clock source */
while ((getreg32(STM32_RCC_CFGR) & RCC_CFGR_SWS_PLL) == 0);
}
#endif
