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10b4dc5208
Move dma_ops to a separate header file, following other uclass implementations. While doing so, this patch also improves dma_ops documentation. Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2015
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* Texas Instruments Incorporated, <www.ti.com>
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*/
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#ifndef _DMA_H_
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#define _DMA_H_
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/*
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* enum dma_direction - dma transfer direction indicator
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* @DMA_MEM_TO_MEM: Memcpy mode
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* @DMA_MEM_TO_DEV: From Memory to Device
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* @DMA_DEV_TO_MEM: From Device to Memory
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* @DMA_DEV_TO_DEV: From Device to Device
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*/
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enum dma_direction {
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DMA_MEM_TO_MEM,
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DMA_MEM_TO_DEV,
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DMA_DEV_TO_MEM,
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DMA_DEV_TO_DEV,
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};
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#define DMA_SUPPORTS_MEM_TO_MEM BIT(0)
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#define DMA_SUPPORTS_MEM_TO_DEV BIT(1)
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#define DMA_SUPPORTS_DEV_TO_MEM BIT(2)
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#define DMA_SUPPORTS_DEV_TO_DEV BIT(3)
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/*
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* struct dma_dev_priv - information about a device used by the uclass
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*
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* @supported: mode of transfers that DMA can support, should be
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* one/multiple of DMA_SUPPORTS_*
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*/
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struct dma_dev_priv {
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u32 supported;
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};
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/*
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* dma_get_device - get a DMA device which supports transfer
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* type of transfer_type
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*
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* @transfer_type - transfer type should be one/multiple of
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* DMA_SUPPORTS_*
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* @devp - udevice pointer to return the found device
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* @return - will return on success and devp will hold the
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* pointer to the device
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*/
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int dma_get_device(u32 transfer_type, struct udevice **devp);
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/*
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* dma_memcpy - try to use DMA to do a mem copy which will be
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* much faster than CPU mem copy
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*
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* @dst - destination pointer
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* @src - souce pointer
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* @len - data length to be copied
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* @return - on successful transfer returns no of bytes
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transferred and on failure return error code.
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*/
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int dma_memcpy(void *dst, void *src, size_t len);
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#endif /* _DMA_H_ */
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