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[nrf fromtree] drivers: flash: nrf_rram: add support for RRAM throttling #3280

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Merged
merged 1 commit into from
Sep 25, 2025
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[nrf fromtree] drivers: flash: nrf_rram: add support for RRAM throttling #3280

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23 changes: 23 additions & 0 deletions drivers/flash/Kconfig.nrf_rram
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Original file line number Diff line number Diff line change
Expand Up @@ -56,8 +56,15 @@ config SOC_FLASH_NRF_RADIO_SYNC_NONE
bool "none"
help
disable synchronization between flash memory driver and radio.

endchoice

config SOC_FLASH_NRF_THROTTLING
bool "Nordic nRFx throttling for flash write operations"
help
Enable throttling for flash write operations to avoid overloading the
flash memory controller.

config SOC_FLASH_NRF_TIMEOUT_MULTIPLIER
int "Multiplier for flash operation timeouts [x0.1]"
depends on !SOC_FLASH_NRF_RADIO_SYNC_NONE
Expand All @@ -81,4 +88,20 @@ config NRF_RRAM_REGION_SIZE_UNIT
help
Base unit for the size of RRAMC's region protection.

config NRF_RRAM_THROTTLING_DELAY
int "Delay between flash write operations"
depends on SOC_FLASH_NRF_THROTTLING
default 2000
help
This is the delay (in microseconds) between consecutive flash write
operations when throttling is enabled.

config NRF_RRAM_THROTTLING_DATA_BLOCK
int "Number of Data blocks for each flash write operations"
depends on SOC_FLASH_NRF_THROTTLING
default 16
help
This is the number of data blocks (in number of 128-bit words) for flash write
operations when throttling is enabled.

endif # SOC_FLASH_NRF_RRAM
21 changes: 17 additions & 4 deletions drivers/flash/soc_flash_nrf_rram.c
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Original file line number Diff line number Diff line change
Expand Up @@ -164,11 +164,24 @@ static void rram_write(off_t addr, const void *data, size_t len)
nrf_rramc_config_set(NRF_RRAMC, &config);
#endif

if (data) {
memcpy((void *)addr, data, len);
} else {
memset((void *)addr, ERASE_VALUE, len);
size_t chunk_len = len;

#ifdef CONFIG_SOC_FLASH_NRF_THROTTLING
while (len > 0) {
chunk_len = MIN(len, CONFIG_NRF_RRAM_THROTTLING_DATA_BLOCK * WRITE_LINE_SIZE);
#endif /* CONFIG_SOC_FLASH_NRF_THROTTLING */
if (data) {
memcpy((void *)addr, data, chunk_len);
} else {
memset((void *)addr, ERASE_VALUE, chunk_len);
}
#ifdef CONFIG_SOC_FLASH_NRF_THROTTLING
addr += chunk_len;
data = (const uint8_t *)data + chunk_len;
len -= chunk_len;
k_usleep(CONFIG_NRF_RRAM_THROTTLING_DELAY);
}
#endif /* CONFIG_SOC_FLASH_NRF_THROTTLING */

barrier_dmem_fence_full(); /* Barrier following our last write. */

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