[nrf fromtree] drv: nordic_vpr_launcher: manage data cache

Write-back cache after copying VPR's code and data to the destination
memory. It allows VPRs to run from RAM regions cacheable by its host.

It allows to use FLPR in nRF54H20.

Signed-off-by: Hubert Miś <[email protected]>
(cherry picked from commit dab6c733e30f7d3644d36eadb421a6f7fc9e515e)

Author: Hubert Miś

drivers/misc/nordic_vpr_launcher/nordic_vpr_launcher.c

@@ -7,6 +7,7 @@
 
 #include <string.h>
 
+#include <zephyr/cache.h>
 #include <zephyr/devicetree.h>
 #include <zephyr/init.h>
 #include <zephyr/logging/log.h>
@@ -38,6 +39,11 @@ static int nordic_vpr_launcher_init(const struct device *dev)
 		LOG_DBG("Loading VPR (%p) from %p to %p (%zu bytes)", config->vpr,
 			(void *)config->src_addr, (void *)config->exec_addr, config->size);
 		memcpy((void *)config->exec_addr, (void *)config->src_addr, config->size);
+#if defined(CONFIG_DCACHE)
+		LOG_DBG("Writing back cache with loaded VPR (from %p %zu bytes)",
+			(void *)config->exec_addr, config->size);
+		sys_cache_data_flush_range((void *)config->exec_addr, config->size);
+#endif
 	}
 #endif