diff options
Diffstat (limited to 'arch/arm/common/dmabounce.c')
| -rw-r--r-- | arch/arm/common/dmabounce.c | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c index 734ac91..bc90364 100644 --- a/arch/arm/common/dmabounce.c +++ b/arch/arm/common/dmabounce.c @@ -308,15 +308,11 @@ static inline void unmap_single(struct device *dev, dma_addr_t dma_addr, memcpy(ptr, buf->safe, size); /* - * DMA buffers must have the same cache properties - * as if they were really used for DMA - which means - * data must be written back to RAM. Note that - * we don't use dmac_flush_range() here for the - * bidirectional case because we know the cache - * lines will be coherent with the data written. + * Since we may have written to a page cache page, + * we need to ensure that the data will be coherent + * with user mappings. */ - dmac_clean_range(ptr, ptr + size); - outer_clean_range(__pa(ptr), __pa(ptr) + size); + __cpuc_flush_kernel_dcache_area(ptr, size); } free_safe_buffer(dev->archdata.dmabounce, buf); } @@ -342,6 +338,22 @@ dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, } EXPORT_SYMBOL(dma_map_single); +/* + * see if a mapped address was really a "safe" buffer and if so, copy + * the data from the safe buffer back to the unsafe buffer and free up + * the safe buffer. (basically return things back to the way they + * should be) + */ +void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, + enum dma_data_direction dir) +{ + dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n", + __func__, (void *) dma_addr, size, dir); + + unmap_single(dev, dma_addr, size, dir); +} +EXPORT_SYMBOL(dma_unmap_single); + dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir) { @@ -366,8 +378,7 @@ EXPORT_SYMBOL(dma_map_page); * the safe buffer. (basically return things back to the way they * should be) */ - -void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, +void dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction dir) { dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n", @@ -375,7 +386,7 @@ void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, unmap_single(dev, dma_addr, size, dir); } -EXPORT_SYMBOL(dma_unmap_single); +EXPORT_SYMBOL(dma_unmap_page); int dmabounce_sync_for_cpu(struct device *dev, dma_addr_t addr, unsigned long off, size_t sz, enum dma_data_direction dir) |
