linux-stable/include/linux/dma/sprd-dma.h
Eric Long ca1b7d3daf dmaengine: sprd: Add Spreadtrum DMA configuration
This patch adds the 'device_config' and 'device_prep_slave_sg' interfaces
for users to configure DMA, as well as adding one 'struct sprd_dma_config'
structure to save Spreadtrum DMA configuration for each DMA channel.

Signed-off-by: Eric Long <eric.long@spreadtrum.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-05-29 10:15:33 +05:30

61 lines
2 KiB
C

/* 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