projects / J-u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 83d290c5 | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
| a0594cef M |
2 | /* |
| 3 | * (C) Copyright 2015 | |
| 4 | * Texas Instruments Incorporated, <www.ti.com> | |
| a0594cef M |
5 | */ |
| 6 | ||
| 7 | #ifndef _DMA_H_ | |
| 8 | #define _DMA_H_ | |
| 9 | ||
| 10 | /* | |
| 11 | * enum dma_direction - dma transfer direction indicator | |
| 12 | * @DMA_MEM_TO_MEM: Memcpy mode | |
| 13 | * @DMA_MEM_TO_DEV: From Memory to Device | |
| 14 | * @DMA_DEV_TO_MEM: From Device to Memory | |
| 15 | * @DMA_DEV_TO_DEV: From Device to Device | |
| 16 | */ | |
| 17 | enum dma_direction { | |
| 18 | DMA_MEM_TO_MEM, | |
| 19 | DMA_MEM_TO_DEV, | |
| 20 | DMA_DEV_TO_MEM, | |
| 21 | DMA_DEV_TO_DEV, | |
| 22 | }; | |
| 23 | ||
| 24 | #define DMA_SUPPORTS_MEM_TO_MEM BIT(0) | |
| 25 | #define DMA_SUPPORTS_MEM_TO_DEV BIT(1) | |
| 26 | #define DMA_SUPPORTS_DEV_TO_MEM BIT(2) | |
| 27 | #define DMA_SUPPORTS_DEV_TO_DEV BIT(3) | |
| 28 | ||
| 29 | /* | |
| 30 | * struct dma_ops - Driver model DMA operations | |
| 31 | * | |
| 32 | * The uclass interface is implemented by all DMA devices which use | |
| 33 | * driver model. | |
| 34 | */ | |
| 35 | struct dma_ops { | |
| 36 | /* | |
| 37 | * Get the current timer count | |
| 38 | * | |
| 39 | * @dev: The DMA device | |
| 40 | * @direction: direction of data transfer should be one from | |
| 41 | enum dma_direction | |
| 42 | * @dst: Destination pointer | |
| 43 | * @src: Source pointer | |
| 44 | * @len: Length of the data to be copied. | |
| 45 | * @return: 0 if OK, -ve on error | |
| 46 | */ | |
| 47 | int (*transfer)(struct udevice *dev, int direction, void *dst, | |
| 48 | void *src, size_t len); | |
| 49 | }; | |
| 50 | ||
| 51 | /* | |
| 52 | * struct dma_dev_priv - information about a device used by the uclass | |
| 53 | * | |
| 54 | * @supported: mode of transfers that DMA can support, should be | |
| 55 | * one/multiple of DMA_SUPPORTS_* | |
| 56 | */ | |
| 57 | struct dma_dev_priv { | |
| 58 | u32 supported; | |
| 59 | }; | |
| 60 | ||
| 61 | /* | |
| 62 | * dma_get_device - get a DMA device which supports transfer | |
| 63 | * type of transfer_type | |
| 64 | * | |
| 65 | * @transfer_type - transfer type should be one/multiple of | |
| 66 | * DMA_SUPPORTS_* | |
| 67 | * @devp - udevice pointer to return the found device | |
| 68 | * @return - will return on success and devp will hold the | |
| 69 | * pointer to the device | |
| 70 | */ | |
| 71 | int dma_get_device(u32 transfer_type, struct udevice **devp); | |
| 72 | ||
| 73 | /* | |
| 74 | * dma_memcpy - try to use DMA to do a mem copy which will be | |
| 75 | * much faster than CPU mem copy | |
| 76 | * | |
| 77 | * @dst - destination pointer | |
| 78 | * @src - souce pointer | |
| 79 | * @len - data length to be copied | |
| 80 | * @return - on successful transfer returns no of bytes | |
| 81 | transferred and on failure return error code. | |
| 82 | */ | |
| 83 | int dma_memcpy(void *dst, void *src, size_t len); | |
| 84 | ||
| 85 | #endif /* _DMA_H_ */ |