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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,
};
/*
* struct sprd_dma_linklist - DMA link-list address structure
* @virt_addr: link-list virtual address to configure link-list node
* @phy_addr: link-list physical address to link DMA transfer
*
* The Spreadtrum DMA controller supports the link-list mode, that means slaves
* can supply several groups configurations (each configuration represents one
* DMA transfer) saved in memory, and DMA controller will link these groups
* configurations by writing the physical address of each configuration into the
* link-list register.
*
* Just as shown below, the link-list pointer register will be pointed to the
* physical address of 'configuration 1', and the 'configuration 1' link-list
* pointer will be pointed to 'configuration 2', and so on.
* Once trigger the DMA transfer, the DMA controller will load 'configuration
* 1' to its registers automatically, after 'configuration 1' transaction is
* done, DMA controller will load 'configuration 2' automatically, until all
* DMA transactions are done.
*
* Note: The last link-list pointer should point to the physical address
* of 'configuration 1', which can avoid DMA controller loads incorrect
* configuration when the last configuration transaction is done.
*
* DMA controller linklist memory
* ====================== -----------------------
*| | | configuration 1 |<---
*| DMA controller | ------->| | |
*| | | | | |
*| | | | | |
*| | | | | |
*| linklist pointer reg |---- ----| linklist pointer | |
* ====================== | ----------------------- |
* | |
* | ----------------------- |
* | | configuration 2 | |
* --->| | |
* | | |
* | | |
* | | |
* ----| linklist pointer | |
* | ----------------------- |
* | |
* | ----------------------- |
* | | configuration 3 | |
* --->| | |
* | | |
* | . | |
* . |
* . |
* . |
* | . |
* | ----------------------- |
* | | configuration n | |
* --->| | |
* | | |
* | | |
* | | |
* | linklist pointer |----
* -----------------------
*
* To support the link-list mode, DMA slaves should allocate one segment memory
* from always-on IRAM or dma coherent memory to store these groups of DMA
* configuration, and pass the virtual and physical address to DMA controller.
*/
struct sprd_dma_linklist {
unsigned long virt_addr;
phys_addr_t phy_addr;
};
#endif
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