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nuttx/arch/arm/src/stm32f7/stm32f74xx75xx_rcc.c

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/****************************************************************************
* arch/arm/src/stm32f7/stm32f74xxx75xx_rcc.c
*
* Copyright (C) 2015 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"
/****************************************************************************
* Pre-processor 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)
/* Same for HSI */
#define HSIRDY_TIMEOUT HSERDY_TIMEOUT
/* HSE divisor to yield ~1MHz RTC clock */
#define HSE_DIVISOR (STM32_HSE_FREQUENCY + 500000) / 1000000
/* FLASH wait states */
#if !defined(BOARD_FLASH_WAITSTATES)
# error BOARD_FLASH_WAITSTATES not defined
#elif BOARD_FLASH_WAITSTATES < 0 || BOARD_FLASH_WAITSTATES > 15
# error BOARD_FLASH_WAITSTATES is out of range
#endif
/****************************************************************************
* 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 HSION, HSEON, CSSON and PLLON bits */
regval = getreg32(STM32_RCC_CR);
regval &= ~(RCC_CR_HSION|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 STM32F7_NGPIO > 0
regval |= (RCC_AHB1ENR_GPIOAEN
#if STM32F7_NGPIO > 1
| RCC_AHB1ENR_GPIOBEN
#endif
#if STM32F7_NGPIO > 2
| RCC_AHB1ENR_GPIOCEN
#endif
#if STM32F7_NGPIO > 3
| RCC_AHB1ENR_GPIODEN
#endif
#if STM32F7_NGPIO > 4
| RCC_AHB1ENR_GPIOEEN
#endif
#if STM32F7_NGPIO > 5
| RCC_AHB1ENR_GPIOFEN
#endif
#if STM32F7_NGPIO > 6
| RCC_AHB1ENR_GPIOGEN
#endif
#if STM32F7_NGPIO > 7
| RCC_AHB1ENR_GPIOHEN
#endif
#if STM32F7_NGPIO > 8
| RCC_AHB1ENR_GPIOIEN
#endif
#if STM32F7_NGPIO > 9
| RCC_AHB1ENR_GPIOJEN
#endif
#if STM32F7_NGPIO > 10
| RCC_AHB1ENR_GPIOKEN
#endif
);
#endif
#ifdef CONFIG_STM32F7_CRC
/* CRC clock enable */
regval |= RCC_AHB1ENR_CRCEN;
#endif
#ifdef CONFIG_STM32F7_BKPSRAM
/* Backup SRAM clock enable */
regval |= RCC_AHB1ENR_BKPSRAMEN;
#endif
#ifdef CONFIG_ARMV7M_DTCM
/* DTCM data RAM clock enable */
regval |= RCC_AHB1ENR_DTCMRAMEN;
#endif
#ifdef CONFIG_STM32F7_DMA1
/* DMA 1 clock enable */
regval |= RCC_AHB1ENR_DMA1EN;
#endif
#ifdef CONFIG_STM32F7_DMA2
/* DMA 2 clock enable */
regval |= RCC_AHB1ENR_DMA2EN;
#endif
#ifdef CONFIG_STM32F7_DMA2D
/* DMA2D clock */
regval |= RCC_AHB1ENR_DMA2DEN;
#endif
#ifdef CONFIG_STM32F7_ETHMAC
/* Ethernet MAC clocking */
regval |= (RCC_AHB1ENR_ETHMACEN | RCC_AHB1ENR_ETHMACTXEN | \
RCC_AHB1ENR_ETHMACRXEN);
#ifdef CONFIG_STM32F7_ETH_PTP
/* Precision Time Protocol (PTP) */
regval |= RCC_AHB1ENR_ETHMACPTPEN;
#endif
#endif
#ifdef CONFIG_STM32F7_OTGHS
/* USB OTG HS */
regval |= RCC_AHB1ENR_OTGHSEN;
#endif /* CONFIG_STM32F7_OTGHS */
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_STM32F7_DCMI
/* Camera interface enable */
regval |= RCC_AHB2ENR_DCMIEN;
#endif
#ifdef CONFIG_STM32F7_CRYP
/* Cryptographic modules clock enable */
regval |= RCC_AHB2ENR_CRYPEN;
#endif
#ifdef CONFIG_STM32F7_HASH
/* Hash modules clock enable */
regval |= RCC_AHB2ENR_HASHEN;
#endif
#ifdef CONFIG_STM32F7_RNG
/* Random number generator clock enable */
regval |= RCC_AHB2ENR_RNGEN;
#endif
#ifdef CONFIG_STM32F7_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)
{
uint32_t regval;
/* Set the appropriate bits in the AHB3ENR register to enabled the
* selected AHB3 peripherals.
*/
regval = getreg32(STM32_RCC_AHB3ENR);
#ifdef CONFIG_STM32F7_FSMC
/* Flexible static memory controller module clock enable */
regval |= RCC_AHB3ENR_FSMCEN;
#endif
#ifdef CONFIG_STM32F7_QUADSPI
/* FQuad SPI memory controller clock enable */
regval |= RCC_AHB3ENR_QSPIEN;
#endif
putreg32(regval, STM32_RCC_AHB3ENR); /* Enable peripherals */
}
/****************************************************************************
* 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_STM32F7_TIM2
/* TIM2 clock enable */
regval |= RCC_APB1ENR_TIM2EN;
#endif
#ifdef CONFIG_STM32F7_TIM3
/* TIM3 clock enable */
regval |= RCC_APB1ENR_TIM3EN;
#endif
#ifdef CONFIG_STM32F7_TIM4
/* TIM4 clock enable */
regval |= RCC_APB1ENR_TIM4EN;
#endif
#ifdef CONFIG_STM32F7_TIM5
/* TIM5 clock enable */
regval |= RCC_APB1ENR_TIM5EN;
#endif
#ifdef CONFIG_STM32F7_TIM6
/* TIM6 clock enable */
regval |= RCC_APB1ENR_TIM6EN;
#endif
#ifdef CONFIG_STM32F7_TIM7
/* TIM7 clock enable */
regval |= RCC_APB1ENR_TIM7EN;
#endif
#ifdef CONFIG_STM32F7_TIM12
/* TIM12 clock enable */
regval |= RCC_APB1ENR_TIM12EN;
#endif
#ifdef CONFIG_STM32F7_TIM13
/* TIM13 clock enable */
regval |= RCC_APB1ENR_TIM13EN;
#endif
#ifdef CONFIG_STM32F7_TIM14
/* TIM14 clock enable */
regval |= RCC_APB1ENR_TIM14EN;
#endif
#ifdef CONFIG_STM32F7_LPTIM1
/* Low-power timer 1 clock enable */
regval |= RCC_APB1ENR_LPTIM1EN;
#endif
#ifdef CONFIG_STM32F7_WWDG
/* Window watchdog clock enable */
regval |= RCC_APB1ENR_WWDGEN;
#endif
#ifdef CONFIG_STM32F7_SPI2
/* SPI2 clock enable */
regval |= RCC_APB1ENR_SPI2EN;
#endif
#ifdef CONFIG_STM32F7_SPI3
/* SPI3 clock enable */
regval |= RCC_APB1ENR_SPI3EN;
#endif
#ifdef CONFIG_STM32F7_SPDIFRX
/* SPDIFRX clock enable */
regval |= RCC_APB1ENR_SPDIFRXEN;
#endif
#ifdef CONFIG_STM32F7_USART2
/* USART 2 clock enable */
regval |= RCC_APB1ENR_USART2EN;
#endif
#ifdef CONFIG_STM32F7_USART3
/* USART3 clock enable */
regval |= RCC_APB1ENR_USART3EN;
#endif
#ifdef CONFIG_STM32F7_UART4
/* UART4 clock enable */
regval |= RCC_APB1ENR_UART4EN;
#endif
#ifdef CONFIG_STM32F7_UART5
/* UART5 clock enable */
regval |= RCC_APB1ENR_UART5EN;
#endif
#ifdef CONFIG_STM32F7_I2C1
/* I2C1 clock enable */
regval |= RCC_APB1ENR_I2C1EN;
#endif
#ifdef CONFIG_STM32F7_I2C2
/* I2C2 clock enable */
regval |= RCC_APB1ENR_I2C2EN;
#endif
#ifdef CONFIG_STM32F7_I2C3
/* I2C3 clock enable */
regval |= RCC_APB1ENR_I2C3EN;
#endif
#ifdef CONFIG_STM32F7_I2C4
/* I2C4 clock enable */
regval |= RCC_APB1ENR_I2C4EN;
#endif
#ifdef CONFIG_STM32F7_CAN1
/* CAN 1 clock enable */
regval |= RCC_APB1ENR_CAN1EN;
#endif
#ifdef CONFIG_STM32F7_CAN2
/* CAN2 clock enable. NOTE: CAN2 needs CAN1 clock as well. */
regval |= (RCC_APB1ENR_CAN1EN | RCC_APB1ENR_CAN2EN);
#endif
#ifdef CONFIG_STM32F7_CEC
/* CEC clock enable. */
regval |= RCC_APB1ENR_CECEN;
#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_STM32F7_DAC1) || defined(CONFIG_STM32F7_DAC2)
/* DAC interface clock enable */
regval |= RCC_APB1ENR_DACEN;
#endif
#ifdef CONFIG_STM32F7_UART7
/* UART7 clock enable */
regval |= RCC_APB1ENR_UART7EN;
#endif
#ifdef CONFIG_STM32F7_UART8
/* UART8 clock enable */
regval |= RCC_APB1ENR_UART8EN;
#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_STM32F7_TIM1
/* TIM1 clock enable */
regval |= RCC_APB2ENR_TIM1EN;
#endif
#ifdef CONFIG_STM32F7_TIM8
/* TIM8 clock enable */
regval |= RCC_APB2ENR_TIM8EN;
#endif
#ifdef CONFIG_STM32F7_USART1
/* USART1 clock enable */
regval |= RCC_APB2ENR_USART1EN;
#endif
#ifdef CONFIG_STM32F7_USART6
/* USART6 clock enable */
regval |= RCC_APB2ENR_USART6EN;
#endif
#ifdef CONFIG_STM32F7_ADC1
/* ADC1 clock enable */
regval |= RCC_APB2ENR_ADC1EN;
#endif
#ifdef CONFIG_STM32F7_ADC2
/* ADC2 clock enable */
regval |= RCC_APB2ENR_ADC2EN;
#endif
#ifdef CONFIG_STM32F7_ADC3
/* ADC3 clock enable */
regval |= RCC_APB2ENR_ADC3EN;
#endif
#ifdef CONFIG_STM32F7_SDMMC1
/* SDIO clock enable */
regval |= RCC_APB2ENR_SDMMC1EN;
#endif
#ifdef CONFIG_STM32F7_SPI1
/* SPI1 clock enable */
regval |= RCC_APB2ENR_SPI1EN;
#endif
#ifdef CONFIG_STM32F7_SPI4
/* SPI4 clock enable */
regval |= RCC_APB2ENR_SPI4EN;
#endif
/* System configuration controller clock enable */
regval |= RCC_APB2ENR_SYSCFGEN;
#ifdef CONFIG_STM32F7_TIM9
/* TIM9 clock enable */
regval |= RCC_APB2ENR_TIM9EN;
#endif
#ifdef CONFIG_STM32F7_TIM10
/* TIM10 clock enable */
regval |= RCC_APB2ENR_TIM10EN;
#endif
#ifdef CONFIG_STM32F7_TIM11
/* TIM11 clock enable */
regval |= RCC_APB2ENR_TIM11EN;
#endif
#ifdef CONFIG_STM32F7_SPI5
/* SPI5 clock enable */
regval |= RCC_APB2ENR_SPI5EN;
#endif
#ifdef CONFIG_STM32F7_SPI6
/* SPI6 clock enable */
regval |= RCC_APB2ENR_SPI6EN;
#endif
#ifdef CONFIG_STM32F7_SAI1
/* SPI6 clock enable */
regval |= RCC_APB2ENR_SAI1EN;
#endif
#ifdef CONFIG_STM32F7_SAI2
/* SPI6 clock enable */
regval |= RCC_APB2ENR_SAI2EN;
#endif
#ifdef CONFIG_STM32F7_LTDC
/* LTDC clock enable */
regval |= RCC_APB2ENR_LTDCEN;
#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_STM32F7_CUSTOM_CLOCKCONFIG
static void stm32_stdclockconfig(void)
{
uint32_t regval;
volatile int32_t timeout;
#ifdef STM32_BOARD_USEHSI
/* Enable Internal High-Speed Clock (HSI) */
regval = getreg32(STM32_RCC_CR);
regval |= RCC_CR_HSION; /* Enable HSI */
putreg32(regval, STM32_RCC_CR);
/* Wait until the HSI is ready (or until a timeout elapsed) */
for (timeout = HSIRDY_TIMEOUT; timeout > 0; timeout--)
{
/* Check if the HSIRDY flag is the set in the CR */
if ((getreg32(STM32_RCC_CR) & RCC_CR_HSIRDY) != 0)
{
/* If so, then break-out with timeout > 0 */
break;
}
}
#else /* if STM32_BOARD_USEHSE */
/* 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;
}
}
#endif
/* 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 216 MHz.
*/
regval = getreg32(STM32_RCC_APB1ENR);
regval |= RCC_APB1ENR_PWREN;
putreg32(regval, STM32_RCC_APB1ENR);
regval = getreg32(STM32_PWR_CR1);
regval &= ~PWR_CR1_VOS_MASK;
regval |= PWR_CR1_VOS_SCALE_1;
putreg32(regval, STM32_PWR_CR1);
/* 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);
#ifdef CONFIG_RTC_HSECLOCK
/* Set the RTC clock divisor */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~RCC_CFGR_RTCPRE_MASK;
regval |= RCC_CFGR_RTCPRE(HSE_DIVISOR);
putreg32(regval, STM32_RCC_CFGR);
#endif
/* Set the PLL dividers and multipliers to configure the main PLL */
#ifdef STM32_BOARD_USEHSI
regval = (STM32_PLLCFG_PLLM | STM32_PLLCFG_PLLN |STM32_PLLCFG_PLLP |
RCC_PLLCFG_PLLSRC_HSI | STM32_PLLCFG_PLLQ);
#else /* if STM32_BOARD_USEHSE */
regval = (STM32_PLLCFG_PLLM | STM32_PLLCFG_PLLN |STM32_PLLCFG_PLLP |
RCC_PLLCFG_PLLSRC_HSE | STM32_PLLCFG_PLLQ);
#endif
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 the Over-drive to extend the clock frequency to 216 Mhz */
regval = getreg32(STM32_PWR_CR1);
regval |= PWR_CR1_ODEN;
putreg32(regval, STM32_PWR_CR1);
while ((getreg32(STM32_PWR_CSR1) & PWR_CSR1_ODRDY) == 0)
{
}
regval = getreg32(STM32_PWR_CR1);
regval |= PWR_CR1_ODSWEN;
putreg32(regval, STM32_PWR_CR1);
while ((getreg32(STM32_PWR_CSR1) & PWR_CSR1_ODSWRDY) == 0)
{
}
/* Configure FLASH wait states */
regval = FLASH_ACR_LATENCY(BOARD_FLASH_WAITSTATES);
#ifdef CONFIG_STM32F7_FLASH_PREFETCH
/* Enable FLASH prefetch */
regval |= FLASH_ACR_PRFTEN;
#endif
#ifdef CONFIG_ARMV7M_ITCM
/* The Flash memory interface accelerates code execution with a system of
* instruction prefetch and cache lines on ITCM interface (ART
* Accelerator™).
*/
regval |= FLASH_ACR_ARTEN;
#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)
{
}
#ifdef CONFIG_STM32F7_LTDC
/* Configure PLLSAI */
regval = getreg32(STM32_RCC_PLLSAICFGR);
regval |= (STM32_RCC_PLLSAICFGR_PLLSAIN
| STM32_RCC_PLLSAICFGR_PLLSAIR
| STM32_RCC_PLLSAICFGR_PLLSAIQ);
putreg32(regval, STM32_RCC_PLLSAICFGR);
regval = getreg32(STM32_RCC_DCKCFGR);
regval |= STM32_RCC_DCKCFGR_PLLSAIDIVR;
putreg32(regval, STM32_RCC_DCKCFGR);
/* Enable PLLSAI */
regval = getreg32(STM32_RCC_CR);
regval |= RCC_CR_PLLSAION;
putreg32(regval, STM32_RCC_CR);
/* Wait until the PLLSAI is ready */
while ((getreg32(STM32_RCC_CR) & RCC_CR_PLLSAIRDY) == 0)
{
}
#endif
#if defined(CONFIG_STM32F7_IWDG) || defined(CONFIG_RTC_LSICLOCK)
/* Low speed internal clock source LSI */
stm32_rcc_enablelsi();
#endif
#if defined(CONFIG_RTC_LSECLOCK)
/* Low speed external clock source LSE
*
* TODO: There is another case where the LSE needs to
* be enabled: if the MCO1 pin selects LSE as source.
*/
stm32_rcc_enablelse();
#endif
}
}
#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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