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Filename : sprd-dma.h
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/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _SPRD_DMA_H_
#define _SPRD_DMA_H_

#define SPRD_DMA_REQ_SHIFT 16
#define SPRD_DMA_FLAGS(req_mode, int_type) \
	((req_mode) << SPRD_DMA_REQ_SHIFT | (int_type))

/*
 * enum sprd_dma_req_mode: define the DMA request mode
 * @SPRD_DMA_FRAG_REQ: fragment request mode
 * @SPRD_DMA_BLK_REQ: block request mode
 * @SPRD_DMA_TRANS_REQ: transaction request mode
 * @SPRD_DMA_LIST_REQ: link-list request mode
 *
 * We have 4 types request mode: fragment mode, block mode, transaction mode
 * and linklist mode. One transaction can contain several blocks, one block can
 * contain several fragments. Link-list mode means we can save several DMA
 * configuration into one reserved memory, then DMA can fetch each DMA
 * configuration automatically to start transfer.
 */
enum sprd_dma_req_mode {
	SPRD_DMA_FRAG_REQ,
	SPRD_DMA_BLK_REQ,
	SPRD_DMA_TRANS_REQ,
	SPRD_DMA_LIST_REQ,
};

/*
 * enum sprd_dma_int_type: define the DMA interrupt type
 * @SPRD_DMA_NO_INT: do not need generate DMA interrupts.
 * @SPRD_DMA_FRAG_INT: fragment done interrupt when one fragment request
 * is done.
 * @SPRD_DMA_BLK_INT: block done interrupt when one block request is done.
 * @SPRD_DMA_BLK_FRAG_INT: block and fragment interrupt when one fragment
 * or one block request is done.
 * @SPRD_DMA_TRANS_INT: tansaction done interrupt when one transaction
 * request is done.
 * @SPRD_DMA_TRANS_FRAG_INT: transaction and fragment interrupt when one
 * transaction request or fragment request is done.
 * @SPRD_DMA_TRANS_BLK_INT: transaction and block interrupt when one
 * transaction request or block request is done.
 * @SPRD_DMA_LIST_INT: link-list done interrupt when one link-list request
 * is done.
 * @SPRD_DMA_CFGERR_INT: configure error interrupt when configuration is
 * incorrect.
 */
enum sprd_dma_int_type {
	SPRD_DMA_NO_INT,
	SPRD_DMA_FRAG_INT,
	SPRD_DMA_BLK_INT,
	SPRD_DMA_BLK_FRAG_INT,
	SPRD_DMA_TRANS_INT,
	SPRD_DMA_TRANS_FRAG_INT,
	SPRD_DMA_TRANS_BLK_INT,
	SPRD_DMA_LIST_INT,
	SPRD_DMA_CFGERR_INT,
};

#endif