1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates. 4 * Synopsys DesignWare eDMA core driver 5 * 6 * Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com> 7 */ 8 9 #ifndef _DW_EDMA_CORE_H 10 #define _DW_EDMA_CORE_H 11 12 #include <linux/msi.h> 13 #include <linux/dma/edma.h> 14 15 #include "../virt-dma.h" 16 17 #define EDMA_LL_SZ 24 18 19 enum dw_edma_dir { 20 EDMA_DIR_WRITE = 0, 21 EDMA_DIR_READ 22 }; 23 24 enum dw_edma_mode { 25 EDMA_MODE_LEGACY = 0, 26 EDMA_MODE_UNROLL 27 }; 28 29 enum dw_edma_request { 30 EDMA_REQ_NONE = 0, 31 EDMA_REQ_STOP, 32 EDMA_REQ_PAUSE 33 }; 34 35 enum dw_edma_status { 36 EDMA_ST_IDLE = 0, 37 EDMA_ST_PAUSE, 38 EDMA_ST_BUSY 39 }; 40 41 struct dw_edma_chan; 42 struct dw_edma_chunk; 43 44 struct dw_edma_burst { 45 struct list_head list; 46 u64 sar; 47 u64 dar; 48 u32 sz; 49 }; 50 51 struct dw_edma_region { 52 phys_addr_t paddr; 53 dma_addr_t vaddr; 54 size_t sz; 55 }; 56 57 struct dw_edma_chunk { 58 struct list_head list; 59 struct dw_edma_chan *chan; 60 struct dw_edma_burst *burst; 61 62 u32 bursts_alloc; 63 64 u8 cb; 65 struct dw_edma_region ll_region; /* Linked list */ 66 }; 67 68 struct dw_edma_desc { 69 struct virt_dma_desc vd; 70 struct dw_edma_chan *chan; 71 struct dw_edma_chunk *chunk; 72 73 u32 chunks_alloc; 74 75 u32 alloc_sz; 76 u32 xfer_sz; 77 }; 78 79 struct dw_edma_chan { 80 struct virt_dma_chan vc; 81 struct dw_edma_chip *chip; 82 int id; 83 enum dw_edma_dir dir; 84 85 off_t ll_off; 86 u32 ll_max; 87 88 off_t dt_off; 89 90 struct msi_msg msi; 91 92 enum dw_edma_request request; 93 enum dw_edma_status status; 94 u8 configured; 95 96 struct dma_slave_config config; 97 }; 98 99 struct dw_edma_irq { 100 struct msi_msg msi; 101 u32 wr_mask; 102 u32 rd_mask; 103 struct dw_edma *dw; 104 }; 105 106 struct dw_edma { 107 char name[20]; 108 109 struct dma_device wr_edma; 110 u16 wr_ch_cnt; 111 112 struct dma_device rd_edma; 113 u16 rd_ch_cnt; 114 115 struct dw_edma_region rg_region; /* Registers */ 116 struct dw_edma_region ll_region; /* Linked list */ 117 struct dw_edma_region dt_region; /* Data */ 118 119 struct dw_edma_irq *irq; 120 int nr_irqs; 121 122 u32 version; 123 enum dw_edma_mode mode; 124 125 struct dw_edma_chan *chan; 126 const struct dw_edma_core_ops *ops; 127 128 raw_spinlock_t lock; /* Only for legacy */ 129 }; 130 131 struct dw_edma_sg { 132 struct scatterlist *sgl; 133 unsigned int len; 134 }; 135 136 struct dw_edma_cyclic { 137 dma_addr_t paddr; 138 size_t len; 139 size_t cnt; 140 }; 141 142 struct dw_edma_transfer { 143 struct dma_chan *dchan; 144 union dw_edma_xfer { 145 struct dw_edma_sg sg; 146 struct dw_edma_cyclic cyclic; 147 } xfer; 148 enum dma_transfer_direction direction; 149 unsigned long flags; 150 bool cyclic; 151 }; 152 153 static inline 154 struct dw_edma_chan *vc2dw_edma_chan(struct virt_dma_chan *vc) 155 { 156 return container_of(vc, struct dw_edma_chan, vc); 157 } 158 159 static inline 160 struct dw_edma_chan *dchan2dw_edma_chan(struct dma_chan *dchan) 161 { 162 return vc2dw_edma_chan(to_virt_chan(dchan)); 163 } 164 165 #endif /* _DW_EDMA_CORE_H */ 166