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drivers: flash: stm32f4: Flush caches after erase

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This implement the same flush cache functionality already present in the
other stm32 series flash drivers, used to avoid bus errors when writing
big chunks of data to the flash.

Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
This commit is contained in:
Fabio Baltieri 2021-06-25 21:58:10 +01:00 committed by Anas Nashif
parent f0c4040159
commit 5efea4283c
1 changed files with 26 additions and 0 deletions
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26
drivers/flash/flash_stm32l4x.c
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@ -40,6 +40,30 @@ bool flash_stm32_valid_range(const struct device *dev, off_t offset,
flash_stm32_range_exists(dev, offset, len);
}
static inline void flush_cache(FLASH_TypeDef *regs)
{
if (regs->ACR & FLASH_ACR_DCEN) {
regs->ACR &= ~FLASH_ACR_DCEN;
/* Datasheet: DCRST: Data cache reset
* This bit can be written only when thes data cache is disabled
*/
regs->ACR |= FLASH_ACR_DCRST;
regs->ACR &= ~FLASH_ACR_DCRST;
regs->ACR |= FLASH_ACR_DCEN;
}
if (regs->ACR & FLASH_ACR_ICEN) {
regs->ACR &= ~FLASH_ACR_ICEN;
/* Datasheet: ICRST: Instruction cache reset :
* This bit can be written only when the instruction cache
* is disabled
*/
regs->ACR |= FLASH_ACR_ICRST;
regs->ACR &= ~FLASH_ACR_ICRST;
regs->ACR |= FLASH_ACR_ICEN;
}
}
/*
* STM32L4xx devices can have up to 512 2K pages on two 256x2K pages banks
*
@ -163,6 +187,8 @@ static int erase_page(const struct device *dev, unsigned int page)
return rc;
}
flush_cache(regs);
/* Set the PER bit and select the page you wish to erase */
regs->CR |= FLASH_CR_PER;
#ifdef FLASH_CR_BKER