dma-mapping.h

Go to the documentation of this file.

/*
 *  Port on Texas Instruments TMS320C6x architecture
 *
 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
 *  Author: Aurelien Jacquiot <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 */
#ifndef _ASM_C6X_DMA_MAPPING_H
#define _ASM_C6X_DMA_MAPPING_H

#include <linux/dma-debug.h>
#include <asm-generic/dma-coherent.h>

#define dma_supported(d, m) 1

static inline int dma_set_mask(struct device *dev, u64 dma_mask)
{
    if (!dev->dma_mask || !dma_supported(dev, dma_mask))
        return -EIO;

    *dev->dma_mask = dma_mask;

    return 0;
}

/*
 * DMA errors are defined by all-bits-set in the DMA address.
 */
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
    return dma_addr == ~0;
}

extern dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
                 size_t size, enum dma_data_direction dir);

extern void dma_unmap_single(struct device *dev, dma_addr_t handle,
                 size_t size, enum dma_data_direction dir);

extern int dma_map_sg(struct device *dev, struct scatterlist *sglist,
              int nents, enum dma_data_direction direction);

extern void dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
             int nents, enum dma_data_direction 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 dir)
{
    dma_addr_t handle;

    handle = dma_map_single(dev, page_address(page) + offset, size, dir);

    debug_dma_map_page(dev, page, offset, size, dir, handle, false);

    return handle;
}

static inline void dma_unmap_page(struct device *dev, dma_addr_t handle,
        size_t size, enum dma_data_direction dir)
{
    dma_unmap_single(dev, handle, size, dir);

    debug_dma_unmap_page(dev, handle, size, dir, false);
}

extern void dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
                    size_t size, enum dma_data_direction dir);

extern void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
                       size_t size,
                       enum dma_data_direction dir);

extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
                int nents, enum dma_data_direction dir);

extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
                   int nents, enum dma_data_direction dir);

extern void coherent_mem_init(u32 start, u32 size);
extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);
extern void dma_free_coherent(struct device *, size_t, void *, dma_addr_t);

#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))

#endif  /* _ASM_C6X_DMA_MAPPING_H */