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>

diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index 4beb59dfc6ec58328961a63c3c5c6a29fcc1bbb7..534376299a99e2b47ebde39e17e619e723bf7461 100644 (file)
--- 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 93612580663851055d058e89321c791d6dfe4765..aaf38bbbb6cdff29e9630bd35f757cf1ec85cf0f 100644 (file)
--- 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);