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nuttx/arch/arm/src/stm32/stm32f20xxx_rcc.c

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/****************************************************************************
* arch/arm/src/stm32/stm32f20xxx_rcc.c
*
* Copyright (C) 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 "stm32_pwr.h"
/* This file supports only the STM32 F2 family (although it is identical to
* the corresponding F4 file).
*/
/****************************************************************************
* Definitions
****************************************************************************/
/* Allow up to 100 milliseconds for the high speed clock to become ready.
* that is a very long delay, but if the clock does not become ready we are
* hosed anyway. Normally this is very fast, but I have seen at least one
* board that required this long, long timeout for the HSE to be ready.
*/
#define HSERDY_TIMEOUT (100 * CONFIG_BOARD_LOOPSPERMSEC)
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: rcc_reset
*
* Description:
* Reset the RCC clock configuration to the default reset state
*
****************************************************************************/
static inline void rcc_reset(void)
{
uint32_t regval;
/* Enable the Internal High Speed clock (HSI) */
regval = getreg32(STM32_RCC_CR);
regval |= RCC_CR_HSION;
putreg32(regval, STM32_RCC_CR);
/* Reset CFGR register */
putreg32(0x00000000, STM32_RCC_CFGR);
/* Reset HSEON, CSSON and PLLON bits */
regval = getreg32(STM32_RCC_CR);
regval &= ~(RCC_CR_HSEON|RCC_CR_CSSON|RCC_CR_PLLON);
putreg32(regval, STM32_RCC_CR);
/* Reset PLLCFGR register to reset default */
putreg32(RCC_PLLCFG_RESET, STM32_RCC_PLLCFG);
/* Reset HSEBYP bit */
regval = getreg32(STM32_RCC_CR);
regval &= ~RCC_CR_HSEBYP;
putreg32(regval, STM32_RCC_CR);
/* Disable all interrupts */
putreg32(0x00000000, STM32_RCC_CIR);
}
/****************************************************************************
* Name: rcc_enableahb1
*
* Description:
* Enable selected AHB1 peripherals
*
****************************************************************************/
static inline void rcc_enableahb1(void)
{
uint32_t regval;
/* Set the appropriate bits in the AHB1ENR register to enabled the
* selected AHB1 peripherals.
*/
regval = getreg32(STM32_RCC_AHB1ENR);
/* Enable GPIOA, GPIOB, .... GPIOI*/
#if STM32_NGPIO > 0
regval |= (RCC_AHB1ENR_GPIOAEN
#if STM32_NGPIO > 16
|RCC_AHB1ENR_GPIOBEN
#endif
#if STM32_NGPIO > 32
|RCC_AHB1ENR_GPIOCEN
#endif
#if STM32_NGPIO > 48
|RCC_AHB1ENR_GPIODEN
#endif
#if STM32_NGPIO > 64
|RCC_AHB1ENR_GPIOEEN
#endif
#if STM32_NGPIO > 80
|RCC_AHB1ENR_GPIOFEN
#endif
#if STM32_NGPIO > 96
|RCC_AHB1ENR_GPIOGEN
#endif
#if STM32_NGPIO > 112
|RCC_AHB1ENR_GPIOHEN
#endif
#if STM32_NGPIO > 128
|RCC_AHB1ENR_GPIOIEN
#endif
);
#endif
#ifdef CONFIG_STM32_CRC
/* CRC clock enable */
regval |= RCC_AHB1ENR_CRCEN;
#endif
#ifdef CONFIG_STM32_BKPSRAM
/* Backup SRAM clock enable */
regval |= RCC_AHB1ENR_BKPSRAMEN;
#endif
#ifdef CONFIG_STM32_DMA1
/* DMA 1 clock enable */
regval |= RCC_AHB1ENR_DMA1EN;
#endif
#ifdef CONFIG_STM32_DMA2
/* DMA 2 clock enable */
regval |= RCC_AHB1ENR_DMA2EN;
#endif
#ifdef CONFIG_STM32_ETHMAC
/* Ethernet MAC clocking */
regval |= (RCC_AHB1ENR_ETHMACEN|RCC_AHB1ENR_ETHMACTXEN|RCC_AHB1ENR_ETHMACRXEN);
#ifdef CONFIG_STM32_ETH_PTP
/* Precision Time Protocol (PTP) */
regval |= RCC_AHB1ENR_ETHMACPTPEN;
#endif
#endif
#ifdef CONFIG_STM32_OTGHS
/* USB OTG HS */
regval |= (RCC_AHB1ENR_OTGHSEN|RCC_AHB1ENR_OTGHSULPIEN);
#endif
putreg32(regval, STM32_RCC_AHB1ENR); /* Enable peripherals */
}
/****************************************************************************
* Name: rcc_enableahb2
*
* Description:
* Enable selected AHB2 peripherals
*
****************************************************************************/
static inline void rcc_enableahb2(void)
{
uint32_t regval;
/* Set the appropriate bits in the AHB2ENR register to enabled the
* selected AHB2 peripherals.
*/
regval = getreg32(STM32_RCC_AHB2ENR);
#ifdef CONFIG_STM32_DCMI
/* Camera interface enable */
regval |= RCC_AHB2ENR_DCMIEN;
#endif
#ifdef CONFIG_STM32_CRYP
/* Cryptographic modules clock enable */
regval |= RCC_AHB2ENR_CRYPEN;
#endif
#ifdef CONFIG_STM32_HASH
/* Hash modules clock enable */
regval |= RCC_AHB2ENR_HASHEN;
#endif
#ifdef CONFIG_STM32_RNG
/* Random number generator clock enable */
regval |= RCC_AHB2ENR_RNGEN;
#endif
#ifdef CONFIG_STM32_OTGFS
/* USB OTG FS clock enable */
regval |= RCC_AHB2ENR_OTGFSEN;
#endif
putreg32(regval, STM32_RCC_AHB2ENR); /* Enable peripherals */
}
/****************************************************************************
* Name: rcc_enableahb3
*
* Description:
* Enable selected AHB3 peripherals
*
****************************************************************************/
static inline void rcc_enableahb3(void)
{
#ifdef CONFIG_STM32_FSMC
uint32_t regval;
/* Set the appropriate bits in the AHB3ENR register to enabled the
* selected AHB3 peripherals.
*/
regval = getreg32(STM32_RCC_AHB3ENR);
/* Flexible static memory controller module clock enable */
regval |= RCC_AHB3ENR_FSMCEN;
putreg32(regval, STM32_RCC_AHB3ENR); /* Enable peripherals */
#endif
}
/****************************************************************************
* Name: rcc_enableapb1
*
* Description:
* Enable selected APB1 peripherals
*
****************************************************************************/
static inline void rcc_enableapb1(void)
{
uint32_t regval;
/* Set the appropriate bits in the APB1ENR register to enabled the
* selected APB1 peripherals.
*/
regval = getreg32(STM32_RCC_APB1ENR);
#ifdef CONFIG_STM32_TIM2
/* TIM2 clock enable */
regval |= RCC_APB1ENR_TIM2EN;
#endif
#ifdef CONFIG_STM32_TIM3
/* TIM3 clock enable */
regval |= RCC_APB1ENR_TIM3EN;
#endif
#ifdef CONFIG_STM32_TIM4
/* TIM4 clock enable */
regval |= RCC_APB1ENR_TIM4EN;
#endif
#ifdef CONFIG_STM32_TIM5
/* TIM5 clock enable */
regval |= RCC_APB1ENR_TIM5EN;
#endif
#ifdef CONFIG_STM32_TIM6
/* TIM6 clock enable */
regval |= RCC_APB1ENR_TIM6EN;
#endif
#ifdef CONFIG_STM32_TIM7
/* TIM7 clock enable */
regval |= RCC_APB1ENR_TIM7EN;
#endif
#ifdef CONFIG_STM32_TIM12
/* TIM12 clock enable */
regval |= RCC_APB1ENR_TIM12EN;
#endif
#ifdef CONFIG_STM32_TIM13
/* TIM13 clock enable */
regval |= RCC_APB1ENR_TIM13EN;
#endif
#ifdef CONFIG_STM32_TIM14
/* TIM14 clock enable */
regval |= RCC_APB1ENR_TIM14EN;
#endif
#ifdef CONFIG_STM32_WWDG
/* Window watchdog clock enable */
regval |= RCC_APB1ENR_WWDGEN;
#endif
#ifdef CONFIG_STM32_SPI2
/* SPI2 clock enable */
regval |= RCC_APB1ENR_SPI2EN;
#endif
#ifdef CONFIG_STM32_SPI3
/* SPI3 clock enable */
regval |= RCC_APB1ENR_SPI3EN;
#endif
#ifdef CONFIG_STM32_USART2
/* USART 2 clock enable */
regval |= RCC_APB1ENR_USART2EN;
#endif
#ifdef CONFIG_STM32_USART3
/* USART3 clock enable */
regval |= RCC_APB1ENR_USART3EN;
#endif
#ifdef CONFIG_STM32_UART4
/* UART4 clock enable */
regval |= RCC_APB1ENR_UART4EN;
#endif
#ifdef CONFIG_STM32_UART5
/* UART5 clock enable */
regval |= RCC_APB1ENR_UART5EN;
#endif
#ifdef CONFIG_STM32_I2C1
/* I2C1 clock enable */
regval |= RCC_APB1ENR_I2C1EN;
#endif
#ifdef CONFIG_STM32_I2C2
/* I2C2 clock enable */
regval |= RCC_APB1ENR_I2C2EN;
#endif
#ifdef CONFIG_STM32_I2C3
/* I2C3 clock enable */
regval |= RCC_APB1ENR_I2C3EN;
#endif
#ifdef CONFIG_STM32_CAN1
/* CAN 1 clock enable */
regval |= RCC_APB1ENR_CAN1EN;
#endif
#ifdef CONFIG_STM32_CAN2
/* CAN2 clock enable. NOTE: CAN2 needs CAN1 clock as well. */
regval |= (RCC_APB1ENR_CAN1EN | RCC_APB1ENR_CAN2EN);
#endif
/* Power interface clock enable. The PWR block is always enabled so that
* we can set the internal voltage regulator for maximum performance.
*/
regval |= RCC_APB1ENR_PWREN;
#if defined (CONFIG_STM32_DAC1) || defined(CONFIG_STM32_DAC2)
/* DAC interface clock enable */
regval |= RCC_APB1ENR_DACEN;
#endif
putreg32(regval, STM32_RCC_APB1ENR); /* Enable peripherals */
}
/****************************************************************************
* Name: rcc_enableapb2
*
* Description:
* Enable selected APB2 peripherals
*
****************************************************************************/
static inline void rcc_enableapb2(void)
{
uint32_t regval;
/* Set the appropriate bits in the APB2ENR register to enabled the
* selected APB2 peripherals.
*/
regval = getreg32(STM32_RCC_APB2ENR);
#ifdef CONFIG_STM32_TIM1
/* TIM1 clock enable */
regval |= RCC_APB2ENR_TIM1EN;
#endif
#ifdef CONFIG_STM32_TIM8
/* TIM8 clock enable */
regval |= RCC_APB2ENR_TIM8EN;
#endif
#ifdef CONFIG_STM32_USART1
/* USART1 clock enable */
regval |= RCC_APB2ENR_USART1EN;
#endif
#ifdef CONFIG_STM32_USART6
/* USART6 clock enable */
regval |= RCC_APB2ENR_USART6EN;
#endif
#ifdef CONFIG_STM32_ADC1
/* ADC1 clock enable */
regval |= RCC_APB2ENR_ADC1EN;
#endif
#ifdef CONFIG_STM32_ADC2
/* ADC2 clock enable */
regval |= RCC_APB2ENR_ADC2EN;
#endif
#ifdef CONFIG_STM32_ADC3
/* ADC3 clock enable */
regval |= RCC_APB2ENR_ADC3EN;
#endif
#ifdef CONFIG_STM32_SDIO
/* SDIO clock enable */
regval |= RCC_APB2ENR_SDIOEN;
#endif
#ifdef CONFIG_STM32_SPI1
/* SPI1 clock enable */
regval |= RCC_APB2ENR_SPI1EN;
#endif
#ifdef CONFIG_STM32_SYSCFG
/* System configuration controller clock enable */
regval |= RCC_APB2ENR_SYSCFGEN;
#endif
#ifdef CONFIG_STM32_TIM9
/* TIM9 clock enable */
regval |= RCC_APB2ENR_TIM9EN;
#endif
#ifdef CONFIG_STM32_TIM10
/* TIM10 clock enable */
regval |= RCC_APB2ENR_TIM10EN;
#endif
#ifdef CONFIG_STM32_TIM11
/* TIM11 clock enable */
regval |= RCC_APB2ENR_TIM11EN;
#endif
putreg32(regval, STM32_RCC_APB2ENR); /* Enable peripherals */
}
/****************************************************************************
* Name: stm32_stdclockconfig
*
* Description:
* Called to change to new clock based on settings in board.h
*
* NOTE: This logic would need to be extended if you need to select low-
* power clocking modes!
****************************************************************************/
#ifndef CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG
static void stm32_stdclockconfig(void)
{
uint32_t regval;
volatile int32_t timeout;
/* Enable External High-Speed Clock (HSE) */
regval = getreg32(STM32_RCC_CR);
regval |= RCC_CR_HSEON; /* Enable HSE */
putreg32(regval, STM32_RCC_CR);
/* Wait until the HSE is ready (or until a timeout elapsed) */
for (timeout = HSERDY_TIMEOUT; timeout > 0; timeout--)
{
/* Check if the HSERDY flag is the set in the CR */
if ((getreg32(STM32_RCC_CR) & RCC_CR_HSERDY) != 0)
{
/* If so, then break-out with timeout > 0 */
break;
}
}
/* Check for a timeout. If this timeout occurs, then we are hosed. We
* have no real back-up plan, although the following logic makes it look
* as though we do.
*/
if (timeout > 0)
{
/* Select regulator voltage output Scale 1 mode to support system
* frequencies up to 168 MHz.
*/
regval = getreg32(STM32_RCC_APB1ENR);
regval |= RCC_APB1ENR_PWREN;
putreg32(regval, STM32_RCC_APB1ENR);
regval = getreg32(STM32_PWR_CR);
regval |= PWR_CR_VOS;
putreg32(regval, STM32_PWR_CR);
/* Set the HCLK source/divider */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~RCC_CFGR_HPRE_MASK;
regval |= STM32_RCC_CFGR_HPRE;
putreg32(regval, STM32_RCC_CFGR);
/* Set the PCLK2 divider */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~RCC_CFGR_PPRE2_MASK;
regval |= STM32_RCC_CFGR_PPRE2;
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);
/* Set the PLL dividers and multiplers to configure the main PLL */
regval = (STM32_PLLCFG_PLLM | STM32_PLLCFG_PLLN |STM32_PLLCFG_PLLP |
RCC_PLLCFG_PLLSRC_HSE | STM32_PLLCFG_PLLQ);
putreg32(regval, STM32_RCC_PLLCFG);
/* Enable the main PLL */
regval = getreg32(STM32_RCC_CR);
regval |= RCC_CR_PLLON;
putreg32(regval, STM32_RCC_CR);
/* Wait until the PLL is ready */
while ((getreg32(STM32_RCC_CR) & RCC_CR_PLLRDY) == 0);
/* Enable FLASH prefetch, instruction cache, data cache, and 5 wait states */
#ifdef CONFIG_STM32_FLASH_PREFETCH
regval = (FLASH_ACR_LATENCY_5 | FLASH_ACR_ICEN | FLASH_ACR_DCEN | FLASH_ACR_PRFTEN);
#else
regval = (FLASH_ACR_LATENCY_5 | FLASH_ACR_ICEN | FLASH_ACR_DCEN);
#endif
putreg32(regval, STM32_FLASH_ACR);
/* Select the main 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 the PLL source is used as the system clock source */
while ((getreg32(STM32_RCC_CFGR) & RCC_CFGR_SWS_MASK) != RCC_CFGR_SWS_PLL);
}
}
#endif
/****************************************************************************
* Name: rcc_enableperiphals
****************************************************************************/
static inline void rcc_enableperipherals(void)
{
rcc_enableahb1();
rcc_enableahb2();
rcc_enableahb3();
rcc_enableapb1();
rcc_enableapb2();
}
/****************************************************************************
* Public Functions
****************************************************************************/
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