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authorGreg Ungerer <gerg@uclinux.org>2009-04-17 23:11:38 +1000
committerGreg Ungerer <gerg@uclinux.org>2009-04-22 14:45:08 +1000
commitec40f95db753d3bfdbcc43b1505ecf7980cb6492 (patch)
treecd0428f11e60ff188c41133a82a92ca4035752be
parent830c072b1ea0078396c42db120452fc36516ed1d (diff)
m68knommu: fix DMA support for ColdFire
ColdFire CPU family members support DMA (all those with the FEC ethernet core use it, the rest have dedicated DMA engines). The code support is just missing a handful of routines for it to be usable by drivers. Add the missing dma_ functions. Signed-off-by: Greg Ungerer <gerg@uclinux.org>
-rw-r--r--arch/m68knommu/Kconfig1
-rw-r--r--arch/m68knommu/kernel/dma.c37
2 files changed, 35 insertions, 3 deletions
diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index 4beb59dfc6e..534376299a9 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -16,6 +16,7 @@ config MMU
config NO_DMA
bool
+ depends on !COLDFIRE
default y
config FPU
diff --git a/arch/m68knommu/kernel/dma.c b/arch/m68knommu/kernel/dma.c
index 93612580663..aaf38bbbb6c 100644
--- a/arch/m68knommu/kernel/dma.c
+++ b/arch/m68knommu/kernel/dma.c
@@ -7,10 +7,9 @@
#include <linux/types.h>
#include <linux/mm.h>
-#include <linux/string.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
-#include <asm/io.h>
+#include <asm/cacheflush.h>
void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp)
@@ -36,7 +35,39 @@ void dma_free_coherent(struct device *dev, size_t size,
free_pages((unsigned long)vaddr, get_order(size));
}
-void dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir)
+void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
+ size_t size, enum dma_data_direction dir)
{
+ switch (dir) {
+ case DMA_TO_DEVICE:
+ flush_dcache_range(handle, size);
+ break;
+ case DMA_FROM_DEVICE:
+ /* Should be clear already */
+ break;
+ default:
+ if (printk_ratelimit())
+ printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
+ break;
+ }
+}
+
+EXPORT_SYMBOL(dma_sync_single_for_device);
+dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
+ enum dma_data_direction dir)
+{
+ dma_addr_t handle = virt_to_phys(addr);
+ flush_dcache_range(handle, size);
+ return handle;
}
+EXPORT_SYMBOL(dma_map_single);
+dma_addr_t dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir)
+{
+ dma_addr_t handle = page_to_phys(page) + offset;
+ dma_sync_single_for_device(dev, handle, size, dir);
+ return handle;
+}
+EXPORT_SYMBOL(dma_map_page);