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drivers: flash: mcxw: Clear cache after erase #81010

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Merged
mmahadevan108 merged 1 commit into from
Nov 8, 2024
Merged

drivers: flash: mcxw: Clear cache after erase #81010

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36 changes: 36 additions & 0 deletions drivers/flash/soc_flash_mcux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -125,6 +125,32 @@ static status_t is_area_readable(uint32_t addr, size_t len)
}
#endif /* CONFIG_CHECK_BEFORE_READING && ! CONFIG_SOC_LPC55S36 */

#define SOC_FLASH_NEED_CLEAR_CACHES 1
#ifdef CONFIG_SOC_SERIES_MCXW
static void clear_flash_caches(void)
{
volatile uint32_t *const smscm_ocmdr0 = (volatile uint32_t *)0x40015400;
/* this bit clears the flash cache */
*smscm_ocmdr0 |= BIT(8);
volatile uint32_t *mcm_cpcr2 = (volatile uint32_t *)0xe0080034;
/* this bit clears the code cache */
*mcm_cpcr2 |= BIT(0);
}
#elif CONFIG_SOC_SERIES_MCXN
static void clear_flash_caches(void)
{
volatile uint32_t *const nvm_ctrl = (volatile uint32_t *)0x40000400;
/* this bit clears the flash cache */
*nvm_ctrl |= BIT(5);
volatile uint32_t *const lpcac_ctrl = (volatile uint32_t *)0x40000824;
/* this bit clears the code cache */
*lpcac_ctrl |= BIT(1);
}
#else
#undef SOC_FLASH_NEED_CLEAR_CACHES
#define clear_flash_caches(...)
#endif

struct flash_priv {
flash_config_t config;
/*
Expand Down Expand Up @@ -172,6 +198,11 @@ static int flash_mcux_erase(const struct device *dev, off_t offset,
(FMU_Type *) DT_INST_REG_ADDR(0),
#endif
addr, len, kFLASH_ApiEraseKey);

if (IS_ENABLED(SOC_FLASH_NEED_CLEAR_CACHES)) {
clear_flash_caches();
}

irq_unlock(key);

k_sem_give(&priv->write_lock);
Expand Down Expand Up @@ -257,6 +288,11 @@ static int flash_mcux_write(const struct device *dev, off_t offset,
(FMU_Type *) DT_INST_REG_ADDR(0),
#endif
addr, (uint8_t *) data, len);

if (IS_ENABLED(SOC_FLASH_NEED_CLEAR_CACHES)) {
clear_flash_caches();
}

irq_unlock(key);

k_sem_give(&priv->write_lock);
Expand Down
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