1 files changed, 128 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/pci_iommu.c b/arch/powerpc/kernel/pci_iommu.c
new file mode 100644
index 000000000000..bdf15dbbf4f0
--- /dev/null
+++ b/arch/powerpc/kernel/pci_iommu.c
@@ -0,0 +1,128 @@
+/*
+ * arch/ppc64/kernel/pci_iommu.c
+ * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
+ *
+ * Rewrite, cleanup, new allocation schemes:
+ * Copyright (C) 2004 Olof Johansson, IBM Corporation
+ *
+ * Dynamic DMA mapping support, platform-independent parts.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/iommu.h>
+#include <asm/pci-bridge.h>
+#include <asm/machdep.h>
+#include <asm/ppc-pci.h>
+
+/*
+ * We can use ->sysdata directly and avoid the extra work in
+ * pci_device_to_OF_node since ->sysdata will have been initialised
+ * in the iommu init code for all devices.
+ */
+#define PCI_GET_DN(dev) ((struct device_node *)((dev)->sysdata))
+
+static inline struct iommu_table *devnode_table(struct device *dev)
+{
+        struct pci_dev *pdev;
+
+        if (!dev) {
+                pdev = ppc64_isabridge_dev;
+                if (!pdev)
+                        return NULL;
+        } else
+                pdev = to_pci_dev(dev);
+
+        return PCI_DN(PCI_GET_DN(pdev))->iommu_table;
+}
+
+
+/* Allocates a contiguous real buffer and creates mappings over it.
+ * Returns the virtual address of the buffer and sets dma_handle
+ * to the dma address (mapping) of the first page.
+ */
+static void *pci_iommu_alloc_coherent(struct device *hwdev, size_t size,
+                           dma_addr_t *dma_handle, gfp_t flag)
+{
+        return iommu_alloc_coherent(devnode_table(hwdev), size, dma_handle,
+                        flag);
+}
+
+static void pci_iommu_free_coherent(struct device *hwdev, size_t size,
+                         void *vaddr, dma_addr_t dma_handle)
+{
+        iommu_free_coherent(devnode_table(hwdev), size, vaddr, dma_handle);
+}
+
+/* Creates TCEs for a user provided buffer.  The user buffer must be 
+ * contiguous real kernel storage (not vmalloc).  The address of the buffer
+ * passed here is the kernel (virtual) address of the buffer.  The buffer
+ * need not be page aligned, the dma_addr_t returned will point to the same
+ * byte within the page as vaddr.
+ */
+static dma_addr_t pci_iommu_map_single(struct device *hwdev, void *vaddr,
+                size_t size, enum dma_data_direction direction)
+{
+        return iommu_map_single(devnode_table(hwdev), vaddr, size, direction);
+}
+
+
+static void pci_iommu_unmap_single(struct device *hwdev, dma_addr_t dma_handle,
+                size_t size, enum dma_data_direction direction)
+{
+        iommu_unmap_single(devnode_table(hwdev), dma_handle, size, direction);
+}
+
+
+static int pci_iommu_map_sg(struct device *pdev, struct scatterlist *sglist,
+                int nelems, enum dma_data_direction direction)
+{
+        return iommu_map_sg(pdev, devnode_table(pdev), sglist,
+                        nelems, direction);
+}
+
+static void pci_iommu_unmap_sg(struct device *pdev, struct scatterlist *sglist,
+                int nelems, enum dma_data_direction direction)
+{
+        iommu_unmap_sg(devnode_table(pdev), sglist, nelems, direction);
+}
+
+/* We support DMA to/from any memory page via the iommu */
+static int pci_iommu_dma_supported(struct device *dev, u64 mask)
+{
+        return 1;
+}
+
+void pci_iommu_init(void)
+{
+        pci_dma_ops.alloc_coherent = pci_iommu_alloc_coherent;
+        pci_dma_ops.free_coherent = pci_iommu_free_coherent;
+        pci_dma_ops.map_single = pci_iommu_map_single;
+        pci_dma_ops.unmap_single = pci_iommu_unmap_single;
+        pci_dma_ops.map_sg = pci_iommu_map_sg;
+        pci_dma_ops.unmap_sg = pci_iommu_unmap_sg;
+        pci_dma_ops.dma_supported = pci_iommu_dma_supported;
+}