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drivers: flash: stm32f7: Flush ART cache before Flash erase

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Similar to #32218 and #34032
Flush ART cache before erase operation
(preparing ART activation)

Signed-off-by: Alexandre Bourdiol <alexandre.bourdiol@st.com>
This commit is contained in:
Alexandre Bourdiol 2021-06-15 15:22:07 +02:00 • committed by Anas Nashif
commit 64d2449185
1 changed files with 14 additions and 0 deletions
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14
drivers/flash/flash_stm32f7x.c
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@ -23,6 +23,20 @@ bool flash_stm32_valid_range(const struct device *dev, off_t offset,
return flash_stm32_range_exists(dev, offset, len);
}
static inline void flush_cache(FLASH_TypeDef *regs)
{
if (regs->ACR & FLASH_ACR_ARTEN) {
regs->ACR &= ~FLASH_ACR_ARTEN;
/* Refernce manual:
* The ART cache can be flushed only if the ART accelerator
* is disabled (ARTEN = 0).
*/
regs->ACR |= FLASH_ACR_ARTRST;
regs->ACR &= ~FLASH_ACR_ARTRST;
regs->ACR |= FLASH_ACR_ARTEN;
}
}
static int write_byte(const struct device *dev, off_t offset, uint8_t val)
{
FLASH_TypeDef *regs = FLASH_STM32_REGS(dev);