kernel/include/linux/soc/ti/knav_dma.h

   1 /*
   2  * Copyright (C) 2014 Texas Instruments Incorporated
   3  * Authors:     Sandeep Nair <sandeep_n@ti.com
   4  *              Cyril Chemparathy <cyril@ti.com
   5                 Santosh Shilimkar <santosh.shilimkar@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation version 2.
  10  *
  11  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  12  * kind, whether express or implied; without even the implied warranty
  13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #ifndef __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__
  18 #define __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__
  19
  20 /*
  21  * PKTDMA descriptor manipulation macros for host packet descriptor
  22  */
  23 #define MASK(x)                                 (BIT(x) - 1)
  24 #define KNAV_DMA_DESC_PKT_LEN_MASK              MASK(22)
  25 #define KNAV_DMA_DESC_PKT_LEN_SHIFT             0
  26 #define KNAV_DMA_DESC_PS_INFO_IN_SOP            BIT(22)
  27 #define KNAV_DMA_DESC_PS_INFO_IN_DESC           0
  28 #define KNAV_DMA_DESC_TAG_MASK                  MASK(8)
  29 #define KNAV_DMA_DESC_SAG_HI_SHIFT              24
  30 #define KNAV_DMA_DESC_STAG_LO_SHIFT             16
  31 #define KNAV_DMA_DESC_DTAG_HI_SHIFT             8
  32 #define KNAV_DMA_DESC_DTAG_LO_SHIFT             0
  33 #define KNAV_DMA_DESC_HAS_EPIB                  BIT(31)
  34 #define KNAV_DMA_DESC_NO_EPIB                   0
  35 #define KNAV_DMA_DESC_PSLEN_SHIFT               24
  36 #define KNAV_DMA_DESC_PSLEN_MASK                MASK(6)
  37 #define KNAV_DMA_DESC_ERR_FLAG_SHIFT            20
  38 #define KNAV_DMA_DESC_ERR_FLAG_MASK             MASK(4)
  39 #define KNAV_DMA_DESC_PSFLAG_SHIFT              16
  40 #define KNAV_DMA_DESC_PSFLAG_MASK               MASK(4)
  41 #define KNAV_DMA_DESC_RETQ_SHIFT                0
  42 #define KNAV_DMA_DESC_RETQ_MASK                 MASK(14)
  43 #define KNAV_DMA_DESC_BUF_LEN_MASK              MASK(22)
  44
  45 #define KNAV_DMA_NUM_EPIB_WORDS                 4
  46 #define KNAV_DMA_NUM_PS_WORDS                   16
  47 #define KNAV_DMA_FDQ_PER_CHAN                   4
  48
  49 /* Tx channel scheduling priority */
  50 enum knav_dma_tx_priority {
  51         DMA_PRIO_HIGH   = 0,
  52         DMA_PRIO_MED_H,
  53         DMA_PRIO_MED_L,
  54         DMA_PRIO_LOW
  55 };
  56
  57 /* Rx channel error handling mode during buffer starvation */
  58 enum knav_dma_rx_err_mode {
  59         DMA_DROP = 0,
  60         DMA_RETRY
  61 };
  62
  63 /* Rx flow size threshold configuration */
  64 enum knav_dma_rx_thresholds {
  65         DMA_THRESH_NONE         = 0,
  66         DMA_THRESH_0            = 1,
  67         DMA_THRESH_0_1          = 3,
  68         DMA_THRESH_0_1_2        = 7
  69 };
  70
  71 /* Descriptor type */
  72 enum knav_dma_desc_type {
  73         DMA_DESC_HOST = 0,
  74         DMA_DESC_MONOLITHIC = 2
  75 };
  76
  77 /**
  78  * struct knav_dma_tx_cfg:      Tx channel configuration
  79  * @filt_einfo:                 Filter extended packet info
  80  * @filt_pswords:               Filter PS words present
  81  * @knav_dma_tx_priority:       Tx channel scheduling priority
  82  */
  83 struct knav_dma_tx_cfg {
  84         bool                            filt_einfo;
  85         bool                            filt_pswords;
  86         enum knav_dma_tx_priority       priority;
  87 };
  88
  89 /**
  90  * struct knav_dma_rx_cfg:      Rx flow configuration
  91  * @einfo_present:              Extended packet info present
  92  * @psinfo_present:             PS words present
  93  * @knav_dma_rx_err_mode:       Error during buffer starvation
  94  * @knav_dma_desc_type: Host or Monolithic desc
  95  * @psinfo_at_sop:              PS word located at start of packet
  96  * @sop_offset:                 Start of packet offset
  97  * @dst_q:                      Destination queue for a given flow
  98  * @thresh:                     Rx flow size threshold
  99  * @fdq[]:                      Free desc Queue array
 100  * @sz_thresh0:                 RX packet size threshold 0
 101  * @sz_thresh1:                 RX packet size threshold 1
 102  * @sz_thresh2:                 RX packet size threshold 2
 103  */
 104 struct knav_dma_rx_cfg {
 105         bool                            einfo_present;
 106         bool                            psinfo_present;
 107         enum knav_dma_rx_err_mode       err_mode;
 108         enum knav_dma_desc_type         desc_type;
 109         bool                            psinfo_at_sop;
 110         unsigned int                    sop_offset;
 111         unsigned int                    dst_q;
 112         enum knav_dma_rx_thresholds     thresh;
 113         unsigned int                    fdq[KNAV_DMA_FDQ_PER_CHAN];
 114         unsigned int                    sz_thresh0;
 115         unsigned int                    sz_thresh1;
 116         unsigned int                    sz_thresh2;
 117 };
 118
 119 /**
 120  * struct knav_dma_cfg: Pktdma channel configuration
 121  * @sl_cfg:                     Slave configuration
 122  * @tx:                         Tx channel configuration
 123  * @rx:                         Rx flow configuration
 124  */
 125 struct knav_dma_cfg {
 126         enum dma_transfer_direction direction;
 127         union {
 128                 struct knav_dma_tx_cfg  tx;
 129                 struct knav_dma_rx_cfg  rx;
 130         } u;
 131 };
 132
 133 /**
 134  * struct knav_dma_desc:        Host packet descriptor layout
 135  * @desc_info:                  Descriptor information like id, type, length
 136  * @tag_info:                   Flow tag info written in during RX
 137  * @packet_info:                Queue Manager, policy, flags etc
 138  * @buff_len:                   Buffer length in bytes
 139  * @buff:                       Buffer pointer
 140  * @next_desc:                  For chaining the descriptors
 141  * @orig_len:                   length since 'buff_len' can be overwritten
 142  * @orig_buff:                  buff pointer since 'buff' can be overwritten
 143  * @epib:                       Extended packet info block
 144  * @psdata:                     Protocol specific
 145  */
 146 struct knav_dma_desc {
 147         u32     desc_info;
 148         u32     tag_info;
 149         u32     packet_info;
 150         u32     buff_len;
 151         u32     buff;
 152         u32     next_desc;
 153         u32     orig_len;
 154         u32     orig_buff;
 155         u32     epib[KNAV_DMA_NUM_EPIB_WORDS];
 156         u32     psdata[KNAV_DMA_NUM_PS_WORDS];
 157         u32     pad[4];
 158 } ____cacheline_aligned;
 159
 160 #if IS_ENABLED(CONFIG_KEYSTONE_NAVIGATOR_DMA)
 161 void *knav_dma_open_channel(struct device *dev, const char *name,
 162                                 struct knav_dma_cfg *config);
 163 void knav_dma_close_channel(void *channel);
 164 #else
 165 static inline void *knav_dma_open_channel(struct device *dev, const char *name,
 166                                 struct knav_dma_cfg *config)
 167 {
 168         return (void *) NULL;
 169 }
 170 static inline void knav_dma_close_channel(void *channel)
 171 {}
 172
 173 #endif
 174
 175 #endif /* __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__ */