powerpc: Move iommu dma ops from dma.c to dma-iommu.c

32-bit platforms are about to start using dma.c; move the iommu
dma ops into their own file to make this a bit cleaner.

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index ab7d4cb..09b3cab 100644 (file)
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -73,7 +73,7 @@ obj-y                         += time.o prom.o traps.o setup-common.o \
                                   udbg.o misc.o io.o \
                                   misc_$(CONFIG_WORD_SIZE).o
 obj-$(CONFIG_PPC32)            += entry_32.o setup_32.o
-obj-$(CONFIG_PPC64)            += dma.o iommu.o
+obj-$(CONFIG_PPC64)            += dma.o dma-iommu.o iommu.o
 obj-$(CONFIG_KGDB)             += kgdb.o
 obj-$(CONFIG_PPC_MULTIPLATFORM)        += prom_init.o
 obj-$(CONFIG_MODULES)          += ppc_ksyms.o

diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
new file mode 100644 (file)
index 0000000..01091f1
--- /dev/null
+++ b/arch/powerpc/kernel/dma-iommu.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
+ *
+ * Provide default implementations of the DMA mapping callbacks for
+ * busses using the iommu infrastructure
+ */
+
+#include <asm/iommu.h>
+
+/*
+ * Generic iommu implementation
+ */
+
+/* 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 *dma_iommu_alloc_coherent(struct device *dev, size_t size,
+                                     dma_addr_t *dma_handle, gfp_t flag)
+{
+       return iommu_alloc_coherent(dev, dev->archdata.dma_data, size,
+                                   dma_handle, device_to_mask(dev), flag,
+                                   dev->archdata.numa_node);
+}
+
+static void dma_iommu_free_coherent(struct device *dev, size_t size,
+                                   void *vaddr, dma_addr_t dma_handle)
+{
+       iommu_free_coherent(dev->archdata.dma_data, 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 dma_iommu_map_single(struct device *dev, void *vaddr,
+                                      size_t size,
+                                      enum dma_data_direction direction,
+                                      struct dma_attrs *attrs)
+{
+       return iommu_map_single(dev, dev->archdata.dma_data, vaddr, size,
+                               device_to_mask(dev), direction, attrs);
+}
+
+
+static void dma_iommu_unmap_single(struct device *dev, dma_addr_t dma_handle,
+                                  size_t size,
+                                  enum dma_data_direction direction,
+                                  struct dma_attrs *attrs)
+{
+       iommu_unmap_single(dev->archdata.dma_data, dma_handle, size, direction,
+                          attrs);
+}
+
+
+static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
+                           int nelems, enum dma_data_direction direction,
+                           struct dma_attrs *attrs)
+{
+       return iommu_map_sg(dev, dev->archdata.dma_data, sglist, nelems,
+                           device_to_mask(dev), direction, attrs);
+}
+
+static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist,
+               int nelems, enum dma_data_direction direction,
+               struct dma_attrs *attrs)
+{
+       iommu_unmap_sg(dev->archdata.dma_data, sglist, nelems, direction,
+                      attrs);
+}
+
+/* We support DMA to/from any memory page via the iommu */
+static int dma_iommu_dma_supported(struct device *dev, u64 mask)
+{
+       struct iommu_table *tbl = dev->archdata.dma_data;
+
+       if (!tbl || tbl->it_offset > mask) {
+               printk(KERN_INFO
+                      "Warning: IOMMU offset too big for device mask\n");
+               if (tbl)
+                       printk(KERN_INFO
+                              "mask: 0x%08lx, table offset: 0x%08lx\n",
+                               mask, tbl->it_offset);
+               else
+                       printk(KERN_INFO "mask: 0x%08lx, table unavailable\n",
+                               mask);
+               return 0;
+       } else
+               return 1;
+}
+
+struct dma_mapping_ops dma_iommu_ops = {
+       .alloc_coherent = dma_iommu_alloc_coherent,
+       .free_coherent  = dma_iommu_free_coherent,
+       .map_single     = dma_iommu_map_single,
+       .unmap_single   = dma_iommu_unmap_single,
+       .map_sg         = dma_iommu_map_sg,
+       .unmap_sg       = dma_iommu_unmap_sg,
+       .dma_supported  = dma_iommu_dma_supported,
+};
+EXPORT_SYMBOL(dma_iommu_ops);

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index ae5708e..44e3486 100644 (file)
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -2,111 +2,15 @@
  * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
  *
  * Provide default implementations of the DMA mapping callbacks for
- * directly mapped busses and busses using the iommu infrastructure
+ * directly mapped busses.
  */
 
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <asm/bug.h>
-#include <asm/iommu.h>
 #include <asm/abs_addr.h>
 
 /*
- * Generic iommu implementation
- */
-
-/* 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 *dma_iommu_alloc_coherent(struct device *dev, size_t size,
-                                     dma_addr_t *dma_handle, gfp_t flag)
-{
-       return iommu_alloc_coherent(dev, dev->archdata.dma_data, size,
-                                   dma_handle, device_to_mask(dev), flag,
-                                   dev->archdata.numa_node);
-}
-
-static void dma_iommu_free_coherent(struct device *dev, size_t size,
-                                   void *vaddr, dma_addr_t dma_handle)
-{
-       iommu_free_coherent(dev->archdata.dma_data, 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 dma_iommu_map_single(struct device *dev, void *vaddr,
-                                      size_t size,
-                                      enum dma_data_direction direction,
-                                      struct dma_attrs *attrs)
-{
-       return iommu_map_single(dev, dev->archdata.dma_data, vaddr, size,
-                               device_to_mask(dev), direction, attrs);
-}
-
-
-static void dma_iommu_unmap_single(struct device *dev, dma_addr_t dma_handle,
-                                  size_t size,
-                                  enum dma_data_direction direction,
-                                  struct dma_attrs *attrs)
-{
-       iommu_unmap_single(dev->archdata.dma_data, dma_handle, size, direction,
-                          attrs);
-}
-
-
-static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
-                           int nelems, enum dma_data_direction direction,
-                           struct dma_attrs *attrs)
-{
-       return iommu_map_sg(dev, dev->archdata.dma_data, sglist, nelems,
-                           device_to_mask(dev), direction, attrs);
-}
-
-static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist,
-               int nelems, enum dma_data_direction direction,
-               struct dma_attrs *attrs)
-{
-       iommu_unmap_sg(dev->archdata.dma_data, sglist, nelems, direction,
-                      attrs);
-}
-
-/* We support DMA to/from any memory page via the iommu */
-static int dma_iommu_dma_supported(struct device *dev, u64 mask)
-{
-       struct iommu_table *tbl = dev->archdata.dma_data;
-
-       if (!tbl || tbl->it_offset > mask) {
-               printk(KERN_INFO
-                      "Warning: IOMMU offset too big for device mask\n");
-               if (tbl)
-                       printk(KERN_INFO
-                              "mask: 0x%08lx, table offset: 0x%08lx\n",
-                               mask, tbl->it_offset);
-               else
-                       printk(KERN_INFO "mask: 0x%08lx, table unavailable\n",
-                               mask);
-               return 0;
-       } else
-               return 1;
-}
-
-struct dma_mapping_ops dma_iommu_ops = {
-       .alloc_coherent = dma_iommu_alloc_coherent,
-       .free_coherent  = dma_iommu_free_coherent,
-       .map_single     = dma_iommu_map_single,
-       .unmap_single   = dma_iommu_unmap_single,
-       .map_sg         = dma_iommu_map_sg,
-       .unmap_sg       = dma_iommu_unmap_sg,
-       .dma_supported  = dma_iommu_dma_supported,
-};
-EXPORT_SYMBOL(dma_iommu_ops);
-
-/*
  * Generic direct DMA implementation
  *
  * This implementation supports a per-device offset that can be applied if