In order to be able to detect cases where DMA isn't capable of
reaching every memory address, port the concept of DMA mask,
dma_set_mask() function and add appropriate check to
dma_mapping_error().
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
include/dma.h | 12 +++++++++++-
include/driver.h | 2 ++
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/include/dma.h b/include/dma.h
index 5fdcb1733..7f9578263 100644
--- a/include/dma.h
+++ b/include/dma.h
@@ -35,11 +35,21 @@ dma_addr_t dma_map_single(struct device_d *dev, void *ptr, size_t size,
void dma_unmap_single(struct device_d *dev, dma_addr_t addr, size_t size,
enum dma_data_direction dir);
+#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
+
+#define DMA_MASK_NONE 0x0ULL
+
+static inline void dma_set_mask(struct device_d *dev, u64 dma_mask)
+{
+ dev->dma_mask = dma_mask;
+}
+
#define DMA_ERROR_CODE (~(dma_addr_t)0)
static inline int dma_mapping_error(struct device_d *dev, dma_addr_t dma_addr)
{
- return dma_addr == DMA_ERROR_CODE;
+ return dma_addr == DMA_ERROR_CODE ||
+ (dev->dma_mask && dma_addr > dev->dma_mask);
}
/* streaming DMA - implement the below calls to support HAS_DMA */
diff --git a/include/driver.h b/include/driver.h
index 91653b794..1b61f2066 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -82,6 +82,8 @@ struct device_d {
const struct of_device_id *of_id_entry;
+ u64 dma_mask;
+
void (*info) (struct device_d *);
/*
* For devices which take longer to probe this is called
--
2.17.1
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