bsps/xqspipsu: Handle SMP systems properly

The NOR driver was not written with SMP systems and caching in mind.
This makes the IsBusy flag volatile for updates across cores and
introduces cache flushing and invalidation where necessary for data
manipulated by the DMA engine in the QSPI peripheral.

1 files changed, 3 insertions, 0 deletions

diff --git a/bsps/shared/dev/spi/xqspipsu-flash-helper.c b/bsps/shared/dev/spi/xqspipsu-flash-helper.c
index 4e018bf2fa..c9d8273b87 100644
--- a/bsps/shared/dev/spi/xqspipsu-flash-helper.c
+++ b/bsps/shared/dev/spi/xqspipsu-flash-helper.c
@@ -314,6 +314,7 @@ static int FlashReadID(XQspiPsu *QspiPsuPtr)
   }
   while (TransferInProgress);
 
+  rtems_cache_invalidate_multiple_data_lines(ReadBfrPtr, 3);
   /* In case of dual, read both and ensure they are same make/size */
 
   /*
@@ -860,6 +861,7 @@ int QspiPsu_NOR_Read(
     while (TransferInProgress);
 
   }
+  rtems_cache_invalidate_multiple_data_lines(ReadBuffer, ByteCount);
   return 0;
 }
 
@@ -1047,6 +1049,7 @@ static int MultiDieRead(
     Address += data_len;
     remain_len -= data_len;
   }
+  rtems_cache_invalidate_multiple_data_lines(ReadBfrPtr, ByteCount);
   return 0;
 }