1 files changed, 474 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
new file mode 100644
index 000000000000..c7ca45f97dd2
--- /dev/null
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -0,0 +1,474 @@
+/*
+ * Copyright (C) 2004 IBM
+ *
+ * Implements the generic device dma API for powerpc.
+ * the pci and vio busses
+ */
+#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 <linux/dma-attrs.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
+
+static inline unsigned long device_to_mask(struct device *dev)
+{
+        if (dev->dma_mask && *dev->dma_mask)
+                return *dev->dma_mask;
+        /* Assume devices without mask can take 32 bit addresses */
+        return 0xfffffffful;
+}
+
+/*
+ * 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,
+                                struct dma_attrs *attrs);
+        void            (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
+                                size_t size, enum dma_data_direction direction,
+                                struct dma_attrs *attrs);
+        int             (*map_sg)(struct device *dev, struct scatterlist *sg,
+                                int nents, enum dma_data_direction direction,
+                                struct dma_attrs *attrs);
+        void            (*unmap_sg)(struct device *dev, struct scatterlist *sg,
+                                int nents, enum dma_data_direction direction,
+                                struct dma_attrs *attrs);
+        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 void set_dma_ops(struct device *dev, struct dma_mapping_ops *ops)
+{
+        dev->archdata.dma_ops = 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);
+}
+
+/* We have our own implementation of pci_set_dma_mask() */
+#define HAVE_ARCH_PCI_SET_DMA_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 dma_addr_t dma_map_single_attrs(struct device *dev,
+                                              void *cpu_addr,
+                                              size_t size,
+                                              enum dma_data_direction direction,
+                                              struct dma_attrs *attrs)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        BUG_ON(!dma_ops);
+        return dma_ops->map_single(dev, cpu_addr, size, direction, attrs);
+}
+
+static inline void dma_unmap_single_attrs(struct device *dev,
+                                          dma_addr_t dma_addr,
+                                          size_t size,
+                                          enum dma_data_direction direction,
+                                          struct dma_attrs *attrs)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        BUG_ON(!dma_ops);
+        dma_ops->unmap_single(dev, dma_addr, size, direction, attrs);
+}
+
+static inline dma_addr_t dma_map_page_attrs(struct device *dev,
+                                            struct page *page,
+                                            unsigned long offset, size_t size,
+                                            enum dma_data_direction direction,
+                                            struct dma_attrs *attrs)
+{
+        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, attrs);
+}
+
+static inline void dma_unmap_page_attrs(struct device *dev,
+                                        dma_addr_t dma_address,
+                                        size_t size,
+                                        enum dma_data_direction direction,
+                                        struct dma_attrs *attrs)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        BUG_ON(!dma_ops);
+        dma_ops->unmap_single(dev, dma_address, size, direction, attrs);
+}
+
+static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
+                                   int nents, enum dma_data_direction direction,
+                                   struct dma_attrs *attrs)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        BUG_ON(!dma_ops);
+        return dma_ops->map_sg(dev, sg, nents, direction, attrs);
+}
+
+static inline void dma_unmap_sg_attrs(struct device *dev,
+                                      struct scatterlist *sg,
+                                      int nhwentries,
+                                      enum dma_data_direction direction,
+                                      struct dma_attrs *attrs)
+{
+        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+
+        BUG_ON(!dma_ops);
+        dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs);
+}
+
+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)
+{
+        return dma_map_single_attrs(dev, cpu_addr, size, direction, NULL);
+}
+
+static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
+                                    size_t size,
+                                    enum dma_data_direction direction)
+{
+        dma_unmap_single_attrs(dev, dma_addr, size, direction, NULL);
+}
+
+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)
+{
+        return dma_map_page_attrs(dev, page, offset, size, direction, NULL);
+}
+
+static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
+                                  size_t size,
+                                  enum dma_data_direction direction)
+{
+        dma_unmap_page_attrs(dev, dma_address, size, direction, NULL);
+}
+
+static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
+                             int nents, enum dma_data_direction direction)
+{
+        return dma_map_sg_attrs(dev, sg, nents, direction, NULL);
+}
+
+static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+                                int nhwentries,
+                                enum dma_data_direction direction)
+{
+        dma_unmap_sg_attrs(dev, sg, nhwentries, direction, NULL);
+}
+
+/*
+ * Available generic sets of operations
+ */
+extern struct dma_mapping_ops dma_iommu_ops;
+extern struct dma_mapping_ops dma_direct_ops;
+
+#else /* CONFIG_PPC64 */
+
+#define dma_supported(dev, mask)        (1)
+
+static inline int dma_set_mask(struct device *dev, u64 dma_mask)
+{
+        if (!dev->dma_mask || !dma_supported(dev, 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 gfp)
+{
+#ifdef CONFIG_NOT_COHERENT_CACHE
+        return __dma_alloc_coherent(size, dma_handle, gfp);
+#else
+        void *ret;
+        /* ignore region specifiers */
+        gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+        if (dev == NULL || dev->coherent_dma_mask < 0xffffffff)
+                gfp |= GFP_DMA;
+
+        ret = (void *)__get_free_pages(gfp, get_order(size));
+
+        if (ret != NULL) {
+                memset(ret, 0, size);
+                *dma_handle = virt_to_bus(ret);
+        }
+
+        return ret;
+#endif
+}
+
+static inline void
+dma_free_coherent(struct device *dev, size_t size, void *vaddr,
+                  dma_addr_t dma_handle)
+{
+#ifdef CONFIG_NOT_COHERENT_CACHE
+        __dma_free_coherent(size, vaddr);
+#else
+        free_pages((unsigned long)vaddr, get_order(size));
+#endif
+}
+
+static inline dma_addr_t
+dma_map_single(struct device *dev, void *ptr, size_t size,
+               enum dma_data_direction direction)
+{
+        BUG_ON(direction == DMA_NONE);
+
+        __dma_sync(ptr, size, direction);
+
+        return virt_to_bus(ptr);
+}
+
+static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
+                                    size_t size,
+                                    enum dma_data_direction direction)
+{
+        /* We do nothing. */
+}
+
+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)
+{
+        BUG_ON(direction == DMA_NONE);
+
+        __dma_sync_page(page, offset, size, direction);
+
+        return page_to_bus(page) + offset;
+}
+
+static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
+                                  size_t size,
+                                  enum dma_data_direction direction)
+{
+        /* We do nothing. */
+}
+
+static inline int
+dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
+           enum dma_data_direction direction)
+{
+        struct scatterlist *sg;
+        int i;
+
+        BUG_ON(direction == DMA_NONE);
+
+        for_each_sg(sgl, sg, nents, i) {
+                BUG_ON(!sg_page(sg));
+                __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+                sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
+        }
+
+        return nents;
+}
+
+static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+                                int nhwentries,
+                                enum dma_data_direction direction)
+{
+        /* We don't do anything here. */
+}
+
+#endif /* CONFIG_PPC64 */
+
+static inline void dma_sync_single_for_cpu(struct device *dev,
+                dma_addr_t dma_handle, size_t size,
+                enum dma_data_direction direction)
+{
+        BUG_ON(direction == DMA_NONE);
+        __dma_sync(bus_to_virt(dma_handle), size, direction);
+}
+
+static inline void dma_sync_single_for_device(struct device *dev,
+                dma_addr_t dma_handle, size_t size,
+                enum dma_data_direction direction)
+{
+        BUG_ON(direction == DMA_NONE);
+        __dma_sync(bus_to_virt(dma_handle), size, direction);
+}
+
+static inline void dma_sync_sg_for_cpu(struct device *dev,
+                struct scatterlist *sgl, int nents,
+                enum dma_data_direction direction)
+{
+        struct scatterlist *sg;
+        int i;
+
+        BUG_ON(direction == DMA_NONE);
+
+        for_each_sg(sgl, sg, nents, i)
+                __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+}
+
+static inline void dma_sync_sg_for_device(struct device *dev,
+                struct scatterlist *sgl, int nents,
+                enum dma_data_direction direction)
+{
+        struct scatterlist *sg;
+        int i;
+
+        BUG_ON(direction == DMA_NONE);
+
+        for_each_sg(sgl, sg, nents, i)
+                __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+}
+
+static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+#ifdef CONFIG_PPC64
+        return (dma_addr == DMA_ERROR_CODE);
+#else
+        return 0;
+#endif
+}
+
+#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
+#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
+#ifdef CONFIG_NOT_COHERENT_CACHE
+#define dma_is_consistent(d, h) (0)
+#else
+#define dma_is_consistent(d, h) (1)
+#endif
+
+static inline int dma_get_cache_alignment(void)
+{
+#ifdef CONFIG_PPC64
+        /* no easy way to get cache size on all processors, so return
+         * the maximum possible, to be safe */
+        return (1 << INTERNODE_CACHE_SHIFT);
+#else
+        /*
+         * Each processor family will define its own L1_CACHE_SHIFT,
+         * L1_CACHE_BYTES wraps to this, so this is always safe.
+         */
+        return L1_CACHE_BYTES;
+#endif
+}
+
+static inline void dma_sync_single_range_for_cpu(struct device *dev,
+                dma_addr_t dma_handle, unsigned long offset, size_t size,
+                enum dma_data_direction direction)
+{
+        /* just sync everything for now */
+        dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
+}
+
+static inline void dma_sync_single_range_for_device(struct device *dev,
+                dma_addr_t dma_handle, unsigned long offset, size_t size,
+                enum dma_data_direction direction)
+{
+        /* just sync everything for now */
+        dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
+}
+
+static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+                enum dma_data_direction direction)
+{
+        BUG_ON(direction == DMA_NONE);
+        __dma_sync(vaddr, size, (int)direction);
+}
+
+#endif /* __KERNEL__ */
+#endif  /* _ASM_DMA_MAPPING_H */