[OpenBIOS] [PATCH 06/15] SPARC32: implement dvma_sync() function for synchronising DMA memory

[Mark Cave-Ayland]

This is required for ensuring that CPU memory is coherent after DMA operations
have completed.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk>
---
 drivers/iommu.c           | 14 ++++++++++++++
 include/drivers/drivers.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/drivers/iommu.c b/drivers/iommu.c
index b8ec09e..c414894 100644
--- a/drivers/iommu.c
+++ b/drivers/iommu.c
@@ -10,6 +10,8 @@
 #include "drivers/drivers.h"
 #include "iommu.h"
 #include "arch/sparc32/ofmem_sparc32.h"
+#include "arch/sparc32/asi.h"
+#include "arch/sparc32/pgtsrmmu.h"
 
 #ifdef CONFIG_DEBUG_IOMMU
 #define DPRINTF(fmt, args...)                   \
@@ -81,6 +83,18 @@ dvma_alloc(int size)
     return va;
 }
 
+void
+dvma_sync(unsigned char *va, int size)
+{
+    /* Synchronise the VA address region after DMA */
+    unsigned long virt = pointer2cell(va);
+    unsigned long page;
+
+    for (page = (unsigned long)virt; page < virt + size; page += PAGE_SIZE) {
+        srmmu_flush_tlb_page(page);
+    }
+}
+
 unsigned int
 dvma_map_in(unsigned char *va)
 {
diff --git a/include/drivers/drivers.h b/include/drivers/drivers.h
index 85a8db0..64824e4 100644
--- a/include/drivers/drivers.h
+++ b/include/drivers/drivers.h
@@ -74,6 +74,7 @@ void ss5_init(uint64_t base);
 /* drivers/iommu.c */
 void ob_init_iommu(uint64_t base);
 void *dvma_alloc(int size);
+void dvma_sync(unsigned char *va, int size);
 unsigned int dvma_map_in(unsigned char *va);
 
 /* drivers/sbus.c */
-- 
2.11.0