1 files changed, 105 insertions, 0 deletions

diff --git a/arch/frv/mb93090-mb00/pci-dma.c b/arch/frv/mb93090-mb00/pci-dma.c
new file mode 100644
index 000000000000..27eb12066507
--- /dev/null
+++ b/arch/frv/mb93090-mb00/pci-dma.c
@@ -0,0 +1,105 @@
+/* pci-dma.c: Dynamic DMA mapping support for the FRV CPUs that have MMUs
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/list.h>
+#include <linux/pci.h>
+#include <linux/highmem.h>
+#include <asm/io.h>
+
+void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, int gfp)
+{
+        void *ret;
+
+        ret = consistent_alloc(gfp, size, dma_handle);
+        if (ret)
+                memset(ret, 0, size);
+
+        return ret;
+}
+
+void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
+{
+        consistent_free(vaddr);
+}
+
+/*
+ * Map a single buffer of the indicated size for DMA in streaming mode.
+ * The 32-bit bus address to use is returned.
+ *
+ * Once the device is given the dma address, the device owns this memory
+ * until either pci_unmap_single or pci_dma_sync_single is performed.
+ */
+dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
+                          enum dma_data_direction direction)
+{
+        if (direction == DMA_NONE)
+                BUG();
+
+        frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
+
+        return virt_to_bus(ptr);
+}
+
+/*
+ * Map a set of buffers described by scatterlist in streaming
+ * mode for DMA.  This is the scather-gather version of the
+ * above pci_map_single interface.  Here the scatter gather list
+ * elements are each tagged with the appropriate dma address
+ * and length.  They are obtained via sg_dma_{address,length}(SG).
+ *
+ * NOTE: An implementation may be able to use a smaller number of
+ *       DMA address/length pairs than there are SG table elements.
+ *       (for example via virtual mapping capabilities)
+ *       The routine returns the number of addr/length pairs actually
+ *       used, at most nents.
+ *
+ * Device ownership issues as mentioned above for pci_map_single are
+ * the same here.
+ */
+int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+               enum dma_data_direction direction)
+{
+        unsigned long dampr2;
+        void *vaddr;
+        int i;
+
+        if (direction == DMA_NONE)
+                BUG();
+
+        dampr2 = __get_DAMPR(2);
+
+        for (i = 0; i < nents; i++) {
+                vaddr = kmap_atomic(sg[i].page, __KM_CACHE);
+
+                frv_dcache_writeback((unsigned long) vaddr,
+                                     (unsigned long) vaddr + PAGE_SIZE);
+
+        }
+
+        kunmap_atomic(vaddr, __KM_CACHE);
+        if (dampr2) {
+                __set_DAMPR(2, dampr2);
+                __set_IAMPR(2, dampr2);
+        }
+
+        return nents;
+}
+
+dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
+                        size_t size, enum dma_data_direction direction)
+{
+        BUG_ON(direction == DMA_NONE);
+        flush_dcache_page(page);
+        return (dma_addr_t) page_to_phys(page) + offset;
+}