X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Farm%2Fmm%2Fconsistent.c;fp=arch%2Farm%2Fmm%2Fconsistent.c;h=6a9c362fef5e241969c42c6133456fb901ce31a2;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=c2ee18d2075e7bd22312835cf9c3d859c0913f5b;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git

diff --git a/arch/arm/mm/consistent.c b/arch/arm/mm/consistent.c
index c2ee18d20..6a9c362fe 100644
--- a/arch/arm/mm/consistent.c
+++ b/arch/arm/mm/consistent.c
@@ -18,6 +18,7 @@
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 
+#include <asm/memory.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 #include <asm/sizes.h>
@@ -223,6 +224,8 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
 		pte = consistent_pte[idx] + off;
 		c->vm_pages = page;
 
+		split_page(page, order);
+
 		/*
 		 * Set the "dma handle"
 		 */
@@ -231,12 +234,11 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
 		do {
 			BUG_ON(!pte_none(*pte));
 
-			set_page_count(page, 1);
 			/*
 			 * x86 does not mark the pages reserved...
 			 */
 			SetPageReserved(page);
-			set_pte(pte, mk_pte(page, prot));
+			set_pte_ext(pte, mk_pte(page, prot), 0);
 			page++;
 			pte++;
 			off++;
@@ -250,7 +252,6 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
 		 * Free the otherwise unused pages.
 		 */
 		while (page < end) {
-			set_page_count(page, 1);
 			__free_page(page);
 			page++;
 		}
@@ -272,6 +273,17 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
 void *
 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
 {
+	if (arch_is_coherent()) {
+		void *virt;
+
+		virt = kmalloc(size, gfp);
+		if (!virt)
+			return NULL;
+		*handle =  virt_to_dma(dev, virt);
+
+		return virt;
+	}
+
 	return __dma_alloc(dev, size, handle, gfp,
 			   pgprot_noncached(pgprot_kernel));
 }
@@ -350,6 +362,11 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr
 
 	WARN_ON(irqs_disabled());
 
+	if (arch_is_coherent()) {
+		kfree(cpu_addr);
+		return;
+	}
+
 	size = PAGE_ALIGN(size);
 
 	spin_lock_irqsave(&consistent_lock, flags);
@@ -459,6 +476,9 @@ core_initcall(consistent_init);
 
 /*
  * Make an area consistent for devices.
+ * Note: Drivers should NOT use this function directly, as it will break
+ * platforms with CONFIG_DMABOUNCE.
+ * Use the driver DMA support - see dma-mapping.h (dma_sync_*)
  */
 void consistent_sync(void *vaddr, size_t size, int direction)
 {