arch/c6x/include/asm/dma-mapping.h

   1 /*
   2  *  Port on Texas Instruments TMS320C6x architecture
   3  *
   4  *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
   5  *  Author: Aurelien Jacquiot <aurelien.jacquiot@ti.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  */
  12 #ifndef _ASM_C6X_DMA_MAPPING_H
  13 #define _ASM_C6X_DMA_MAPPING_H
  14
  15 #include <linux/dma-debug.h>
  16 #include <asm-generic/dma-coherent.h>
  17
  18 #define dma_supported(d, m)     1
  19
  20 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
  21 {
  22         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
  23                 return -EIO;
  24
  25         *dev->dma_mask = dma_mask;
  26
  27         return 0;
  28 }
  29
  30 /*
  31  * DMA errors are defined by all-bits-set in the DMA address.
  32  */
  33 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  34 {
  35         return dma_addr == ~0;
  36 }
  37
  38 extern dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
  39                                  size_t size, enum dma_data_direction dir);
  40
  41 extern void dma_unmap_single(struct device *dev, dma_addr_t handle,
  42                              size_t size, enum dma_data_direction dir);
  43
  44 extern int dma_map_sg(struct device *dev, struct scatterlist *sglist,
  45                       int nents, enum dma_data_direction direction);
  46
  47 extern void dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
  48                          int nents, enum dma_data_direction direction);
  49
  50 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
  51                                       unsigned long offset, size_t size,
  52                                       enum dma_data_direction dir)
  53 {
  54         dma_addr_t handle;
  55
  56         handle = dma_map_single(dev, page_address(page) + offset, size, dir);
  57
  58         debug_dma_map_page(dev, page, offset, size, dir, handle, false);
  59
  60         return handle;
  61 }
  62
  63 static inline void dma_unmap_page(struct device *dev, dma_addr_t handle,
  64                 size_t size, enum dma_data_direction dir)
  65 {
  66         dma_unmap_single(dev, handle, size, dir);
  67
  68         debug_dma_unmap_page(dev, handle, size, dir, false);
  69 }
  70
  71 extern void dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
  72                                     size_t size, enum dma_data_direction dir);
  73
  74 extern void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
  75                                        size_t size,
  76                                        enum dma_data_direction dir);
  77
  78 extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
  79                                 int nents, enum dma_data_direction dir);
  80
  81 extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
  82                                    int nents, enum dma_data_direction dir);
  83
  84 extern void coherent_mem_init(u32 start, u32 size);
  85 extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);
  86 extern void dma_free_coherent(struct device *, size_t, void *, dma_addr_t);
  87
  88 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent((d), (s), (h), (f))
  89 #define dma_free_noncoherent(d, s, v, h)  dma_free_coherent((d), (s), (v), (h))
  90
  91 #endif  /* _ASM_C6X_DMA_MAPPING_H */