Fix powerpc breakage in sg chaining code

Commit 78bdc3106a877cfa50439fa66b52acbc4e7868df ("PPC: sg chaining
support") looks to have removed some unrelated ppc code.  Lets put it
back in.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 143 insertions, 0 deletions

diff --git a/include/asm-powerpc/dma-mapping.h b/include/asm-powerpc/dma-mapping.h
index 2af321f36ab..65be95dd03a 100644
--- a/include/asm-powerpc/dma-mapping.h
+++ b/include/asm-powerpc/dma-mapping.h
@@ -6,6 +6,149 @@
  */
 #ifndef _ASM_DMA_MAPPING_H
 #define _ASM_DMA_MAPPING_H
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/cache.h>
+/* need struct page definitions */
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <asm/io.h>
+
+#define DMA_ERROR_CODE          (~(dma_addr_t)0x0)
+
+#ifdef CONFIG_NOT_COHERENT_CACHE
+/*
+ * DMA-consistent mapping functions for PowerPCs that don't support
+ * cache snooping.  These allocate/free a region of uncached mapped
+ * memory space for use with DMA devices.  Alternatively, you could
+ * allocate the space "normally" and use the cache management functions
+ * to ensure it is consistent.
+ */
+extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
+extern void __dma_free_coherent(size_t size, void *vaddr);
+extern void __dma_sync(void *vaddr, size_t size, int direction);
+extern void __dma_sync_page(struct page *page, unsigned long offset,
+                                 size_t size, int direction);
+
+#else /* ! CONFIG_NOT_COHERENT_CACHE */
+/*
+ * Cache coherent cores.
+ */
+
+#define __dma_alloc_coherent(gfp, size, handle) NULL
+#define __dma_free_coherent(size, addr)         ((void)0)
+#define __dma_sync(addr, size, rw)              ((void)0)
+#define __dma_sync_page(pg, off, sz, rw)        ((void)0)
+
+#endif /* ! CONFIG_NOT_COHERENT_CACHE */
+
+#ifdef CONFIG_PPC64
+/*
+ * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
+ */
+struct dma_mapping_ops {
+        void *          (*alloc_coherent)(struct device *dev, size_t size,
+                                dma_addr_t *dma_handle, gfp_t flag);
+        void            (*free_coherent)(struct device *dev, size_t size,
+                                void *vaddr, dma_addr_t dma_handle);
+        dma_addr_t      (*map_single)(struct device *dev, void *ptr,
+                                size_t size, enum dma_data_direction direction);
+        void            (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
+                                size_t size, enum dma_data_direction direction);
+        int             (*map_sg)(struct device *dev, struct scatterlist *sg,
+                                int nents, enum dma_data_direction direction);
+        void            (*unmap_sg)(struct device *dev, struct scatterlist *sg,
+                                int nents, enum dma_data_direction direction);
+        int             (*dma_supported)(struct device *dev, u64 mask);
+        int             (*set_dma_mask)(struct device *dev, u64 dma_mask);
+};
+
+static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
+{
+        /* We don't handle the NULL dev case for ISA for now. We could
+         * do it via an out of line call but it is not needed for now. The
+         * only ISA DMA device we support is the floppy and we have a hack
+         * in the floppy driver directly to get a device for us.
+         */
+        if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
+                return NULL;
+        return dev->archdata.dma_ops;
+}
+
+static inline int dma_supported(struct device *dev, u64 mask)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        if (unlikely(dma_ops == NULL))
+                return 0;
+        if (dma_ops->dma_supported == NULL)
+                return 1;
+        return dma_ops->dma_supported(dev, mask);
+}
+
+static inline int dma_set_mask(struct device *dev, u64 dma_mask)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        if (unlikely(dma_ops == NULL))
+                return -EIO;
+        if (dma_ops->set_dma_mask != NULL)
+                return dma_ops->set_dma_mask(dev, dma_mask);
+        if (!dev->dma_mask || !dma_supported(dev, dma_mask))
+                return -EIO;
+        *dev->dma_mask = dma_mask;
+        return 0;
+}
+
+static inline void *dma_alloc_coherent(struct device *dev, size_t size,
+                                       dma_addr_t *dma_handle, gfp_t flag)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        BUG_ON(!dma_ops);
+        return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
+}
+
+static inline void dma_free_coherent(struct device *dev, size_t size,
+                                     void *cpu_addr, dma_addr_t dma_handle)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        BUG_ON(!dma_ops);
+        dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
+}
+
+static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
+                                        size_t size,
+                                        enum dma_data_direction direction)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        BUG_ON(!dma_ops);
+        return dma_ops->map_single(dev, cpu_addr, size, direction);
+}
+
+static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
+                                    size_t size,
+                                    enum dma_data_direction direction)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        BUG_ON(!dma_ops);
+        dma_ops->unmap_single(dev, dma_addr, size, direction);
+}
+
+static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
+                                      unsigned long offset, size_t size,
+                                      enum dma_data_direction direction)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        BUG_ON(!dma_ops);
+        return dma_ops->map_single(dev, page_address(page) + offset, size,
+                        direction);
+}
 
 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
                                   size_t size,