1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/ieee1394/dma.h b/drivers/ieee1394/dma.h
new file mode 100644
index 0000000..2727bcd
--- /dev/null
+++ b/drivers/ieee1394/dma.h
@@ -0,0 +1,88 @@
+/*
+ * DMA region bookkeeping routines
+ *
+ * Copyright (C) 2002 Maas Digital LLC
+ *
+ * This code is licensed under the GPL.  See the file COPYING in the root
+ * directory of the kernel sources for details.
+ */
+
+#ifndef IEEE1394_DMA_H
+#define IEEE1394_DMA_H
+
+#include <asm/types.h>
+
+struct pci_dev;
+struct scatterlist;
+struct vm_area_struct;
+
+/**
+ * struct dma_prog_region - small contiguous DMA buffer
+ * @kvirt:    kernel virtual address
+ * @dev:      PCI device
+ * @n_pages:  number of kernel pages
+ * @bus_addr: base bus address
+ *
+ * a small, physically contiguous DMA buffer with random-access, synchronous
+ * usage characteristics
+ */
+struct dma_prog_region {
+	unsigned char *kvirt;
+	struct pci_dev *dev;
+	unsigned int n_pages;
+	dma_addr_t bus_addr;
+};
+
+/* clear out all fields but do not allocate any memory */
+void dma_prog_region_init(struct dma_prog_region *prog);
+int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
+			  struct pci_dev *dev);
+void dma_prog_region_free(struct dma_prog_region *prog);
+
+static inline dma_addr_t dma_prog_region_offset_to_bus(
+		struct dma_prog_region *prog, unsigned long offset)
+{
+	return prog->bus_addr + offset;
+}
+
+/**
+ * struct dma_region - large non-contiguous DMA buffer
+ * @virt:        kernel virtual address
+ * @dev:         PCI device
+ * @n_pages:     number of kernel pages
+ * @n_dma_pages: number of IOMMU pages
+ * @sglist:      IOMMU mapping
+ * @direction:   PCI_DMA_TODEVICE, etc.
+ *
+ * a large, non-physically-contiguous DMA buffer with streaming, asynchronous
+ * usage characteristics
+ */
+struct dma_region {
+	unsigned char *kvirt;
+	struct pci_dev *dev;
+	unsigned int n_pages;
+	unsigned int n_dma_pages;
+	struct scatterlist *sglist;
+	int direction;
+};
+
+void dma_region_init(struct dma_region *dma);
+int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes,
+		     struct pci_dev *dev, int direction);
+void dma_region_free(struct dma_region *dma);
+void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
+			     unsigned long len);
+void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
+				unsigned long len);
+int  dma_region_mmap(struct dma_region *dma, struct file *file,
+		     struct vm_area_struct *vma);
+dma_addr_t dma_region_offset_to_bus(struct dma_region *dma,
+				    unsigned long offset);
+
+/**
+ * dma_region_i - macro to index into a DMA region (or dma_prog_region)
+ */
+#define dma_region_i(_dma, _type, _index) \
+	( ((_type*) ((_dma)->kvirt)) + (_index) )
+
+#endif /* IEEE1394_DMA_H */