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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/frv/mb93090-mb00/pci-dma.c
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/frv/mb93090-mb00/pci-dma.c')
-rw-r--r--arch/frv/mb93090-mb00/pci-dma.c105
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 00000000000..27eb1206650
--- /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;
+}