regmap: name irq_chip based on regmap_irq_chip's name
[linux-2.6.git] / drivers / base / dma-mapping.c
index ca9186f..3fbedc7 100644 (file)
@@ -8,6 +8,9 @@
  */
 
 #include <linux/dma-mapping.h>
+#include <linux/export.h>
+#include <linux/gfp.h>
+#include <asm-generic/dma-coherent.h>
 
 /*
  * Managed DMA API
@@ -215,4 +218,52 @@ void dmam_release_declared_memory(struct device *dev)
 }
 EXPORT_SYMBOL(dmam_release_declared_memory);
 
+/*
+ * Create scatter-list for the already allocated DMA buffer.
+ */
+int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
+                void *cpu_addr, dma_addr_t handle, size_t size)
+{
+       struct page *page = virt_to_page(cpu_addr);
+       int ret;
+
+       ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
+       if (unlikely(ret))
+               return ret;
+
+       sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
+       return 0;
+}
+EXPORT_SYMBOL(dma_common_get_sgtable);
+
 #endif
+
+/*
+ * Create userspace mapping for the DMA-coherent memory.
+ */
+int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
+                   void *cpu_addr, dma_addr_t dma_addr, size_t size)
+{
+       int ret = -ENXIO;
+#ifdef CONFIG_MMU
+       unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+       unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+       unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr));
+       unsigned long off = vma->vm_pgoff;
+
+       vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+       if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
+               return ret;
+
+       if (off < count && user_count <= (count - off)) {
+               ret = remap_pfn_range(vma, vma->vm_start,
+                                     pfn + off,
+                                     user_count << PAGE_SHIFT,
+                                     vma->vm_page_prot);
+       }
+#endif /* CONFIG_MMU */
+
+       return ret;
+}
+EXPORT_SYMBOL(dma_common_mmap);