| /* 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 |
