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/*

 * drivers/base/dma-mapping.c - arch-independent dma-mapping routines

 *

 * Copyright (c) 2006  SUSE Linux Products GmbH

 * Copyright (c) 2006  Tejun Heo <teheo@suse.de>

 *

 * This file is released under the GPLv2.

 */

#include <linux/dma-mapping.h>

/*

 * Managed DMA API

 */

struct dma_devres {

        size_t          size;

        void            *vaddr;

        dma_addr_t      dma_handle;

};

static void dmam_coherent_release(struct device *dev, void *res)

{

        struct dma_devres *this = res;

        dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle);

}

static void dmam_noncoherent_release(struct device *dev, void *res)

{

        struct dma_devres *this = res;

        dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle);

}

static int dmam_match(struct device *dev, void *res, void *match_data)

{

        struct dma_devres *this = res, *match = match_data;

        if (this->vaddr == match->vaddr) {

                WARN_ON(this->size != match->size ||

                        this->dma_handle != match->dma_handle);

                return 1;

        }

        return 0;

}

/**

 * dmam_alloc_coherent - Managed dma_alloc_coherent()

 * @dev: Device to allocate coherent memory for

 * @size: Size of allocation

 * @dma_handle: Out argument for allocated DMA handle

 * @gfp: Allocation flags

 *

 * Managed dma_alloc_coherent().  Memory allocated using this function

 * will be automatically released on driver detach.

 *

 * RETURNS:

 * Pointer to allocated memory on success, NULL on failure.

 */

void * dmam_alloc_coherent(struct device *dev, size_t size,

                           dma_addr_t *dma_handle, gfp_t gfp)

{

        struct dma_devres *dr;

        void *vaddr;

        dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp);

        if (!dr)

                return NULL;

        vaddr = dma_alloc_coherent(dev, size, dma_handle, gfp);

        if (!vaddr) {

                devres_free(dr);

                return NULL;

        }

        dr->vaddr = vaddr;

        dr->dma_handle = *dma_handle;

        dr->size = size;

        devres_add(dev, dr);

        return vaddr;

}

EXPORT_SYMBOL(dmam_alloc_coherent);

/**

 * dmam_free_coherent - Managed dma_free_coherent()

 * @dev: Device to free coherent memory for

 * @size: Size of allocation

 * @vaddr: Virtual address of the memory to free

 * @dma_handle: DMA handle of the memory to free

 *

 * Managed dma_free_coherent().

 */

void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,

                        dma_addr_t dma_handle)

{

        struct dma_devres match_data = { size, vaddr, dma_handle };

        dma_free_coherent(dev, size, vaddr, dma_handle);

        WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match,

                               &match_data));

}

EXPORT_SYMBOL(dmam_free_coherent);

/**

 * dmam_alloc_non_coherent - Managed dma_alloc_non_coherent()

 * @dev: Device to allocate non_coherent memory for

 * @size: Size of allocation

 * @dma_handle: Out argument for allocated DMA handle

 * @gfp: Allocation flags

 *

 * Managed dma_alloc_non_coherent().  Memory allocated using this

 * function will be automatically released on driver detach.

 *

 * RETURNS:

 * Pointer to allocated memory on success, NULL on failure.

 */

void *dmam_alloc_noncoherent(struct device *dev, size_t size,

                             dma_addr_t *dma_handle, gfp_t gfp)

{

        struct dma_devres *dr;

        void *vaddr;

        dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp);

        if (!dr)

                return NULL;

        vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp);

        if (!vaddr) {

                devres_free(dr);

                return NULL;

        }

        dr->vaddr = vaddr;

        dr->dma_handle = *dma_handle;

        dr->size = size;

        devres_add(dev, dr);

        return vaddr;

}

EXPORT_SYMBOL(dmam_alloc_noncoherent);

/**

 * dmam_free_coherent - Managed dma_free_noncoherent()

 * @dev: Device to free noncoherent memory for

 * @size: Size of allocation

 * @vaddr: Virtual address of the memory to free

 * @dma_handle: DMA handle of the memory to free

 *

 * Managed dma_free_noncoherent().

 */

void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,

                           dma_addr_t dma_handle)

{

        struct dma_devres match_data = { size, vaddr, dma_handle };

        dma_free_noncoherent(dev, size, vaddr, dma_handle);

        WARN_ON(!devres_destroy(dev, dmam_noncoherent_release, dmam_match,

                                &match_data));

}

EXPORT_SYMBOL(dmam_free_noncoherent);

#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY

static void dmam_coherent_decl_release(struct device *dev, void *res)

{

        dma_release_declared_memory(dev);

}

/**

 * dmam_declare_coherent_memory - Managed dma_declare_coherent_memory()

 * @dev: Device to declare coherent memory for

 * @bus_addr: Bus address of coherent memory to be declared

 * @device_addr: Device address of coherent memory to be declared

 * @size: Size of coherent memory to be declared

 * @flags: Flags

 *

 * Managed dma_declare_coherent_memory().

 *

 * RETURNS:

 * 0 on success, -errno on failure.

 */

int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,

                                 dma_addr_t device_addr, size_t size, int flags)

{

        void *res;

        int rc;

        res = devres_alloc(dmam_coherent_decl_release, 0, GFP_KERNEL);

        if (!res)

                return -ENOMEM;

        rc = dma_declare_coherent_memory(dev, bus_addr, device_addr, size,

                                         flags);

        if (rc == 0)

                devres_add(dev, res);

        else

                devres_free(res);

        return rc;

}

EXPORT_SYMBOL(dmam_declare_coherent_memory);

/**

 * dmam_release_declared_memory - Managed dma_release_declared_memory().

 * @dev: Device to release declared coherent memory for

 *

 * Managed dmam_release_declared_memory().

 */

void dmam_release_declared_memory(struct device *dev)

{

        WARN_ON(devres_destroy(dev, dmam_coherent_decl_release, NULL, NULL));

}

EXPORT_SYMBOL(dmam_release_declared_memory);

#endif