drivers/dma/dw-edma/dw-edma-core.h

   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_request {
  25         EDMA_REQ_NONE = 0,
  26         EDMA_REQ_STOP,
  27         EDMA_REQ_PAUSE
  28 };
  29
  30 enum dw_edma_status {
  31         EDMA_ST_IDLE = 0,
  32         EDMA_ST_PAUSE,
  33         EDMA_ST_BUSY
  34 };
  35
  36 enum dw_edma_xfer_type {
  37         EDMA_XFER_SCATTER_GATHER = 0,
  38         EDMA_XFER_CYCLIC,
  39         EDMA_XFER_INTERLEAVED
  40 };
  41
  42 struct dw_edma_chan;
  43 struct dw_edma_chunk;
  44
  45 struct dw_edma_burst {
  46         struct list_head                list;
  47         u64                             sar;
  48         u64                             dar;
  49         u32                             sz;
  50 };
  51
  52 struct dw_edma_chunk {
  53         struct list_head                list;
  54         struct dw_edma_chan             *chan;
  55         struct dw_edma_burst            *burst;
  56
  57         u32                             bursts_alloc;
  58
  59         u8                              cb;
  60         struct dw_edma_region           ll_region;      /* Linked list */
  61 };
  62
  63 struct dw_edma_desc {
  64         struct virt_dma_desc            vd;
  65         struct dw_edma_chan             *chan;
  66         struct dw_edma_chunk            *chunk;
  67
  68         u32                             chunks_alloc;
  69
  70         u32                             alloc_sz;
  71         u32                             xfer_sz;
  72 };
  73
  74 struct dw_edma_chan {
  75         struct virt_dma_chan            vc;
  76         struct dw_edma                  *dw;
  77         int                             id;
  78         enum dw_edma_dir                dir;
  79
  80         u32                             ll_max;
  81
  82         struct msi_msg                  msi;
  83
  84         enum dw_edma_request            request;
  85         enum dw_edma_status             status;
  86         u8                              configured;
  87
  88         struct dma_slave_config         config;
  89 };
  90
  91 struct dw_edma_irq {
  92         struct msi_msg                  msi;
  93         u32                             wr_mask;
  94         u32                             rd_mask;
  95         struct dw_edma                  *dw;
  96 };
  97
  98 struct dw_edma {
  99         char                            name[32];
 100
 101         struct dma_device               dma;
 102
 103         u16                             wr_ch_cnt;
 104         u16                             rd_ch_cnt;
 105
 106         struct dw_edma_irq              *irq;
 107         int                             nr_irqs;
 108
 109         struct dw_edma_chan             *chan;
 110
 111         raw_spinlock_t                  lock;           /* Only for legacy */
 112
 113         struct dw_edma_chip             *chip;
 114 };
 115
 116 struct dw_edma_sg {
 117         struct scatterlist              *sgl;
 118         unsigned int                    len;
 119 };
 120
 121 struct dw_edma_cyclic {
 122         dma_addr_t                      paddr;
 123         size_t                          len;
 124         size_t                          cnt;
 125 };
 126
 127 struct dw_edma_transfer {
 128         struct dma_chan                 *dchan;
 129         union dw_edma_xfer {
 130                 struct dw_edma_sg               sg;
 131                 struct dw_edma_cyclic           cyclic;
 132                 struct dma_interleaved_template *il;
 133         } xfer;
 134         enum dma_transfer_direction     direction;
 135         unsigned long                   flags;
 136         enum dw_edma_xfer_type          type;
 137 };
 138
 139 static inline
 140 struct dw_edma_chan *vc2dw_edma_chan(struct virt_dma_chan *vc)
 141 {
 142         return container_of(vc, struct dw_edma_chan, vc);
 143 }
 144
 145 static inline
 146 struct dw_edma_chan *dchan2dw_edma_chan(struct dma_chan *dchan)
 147 {
 148         return vc2dw_edma_chan(to_virt_chan(dchan));
 149 }
 150
 151 #endif /* _DW_EDMA_CORE_H */