drivers/net/ethernet/apm/xgene-v2/ring.h

   1 /*
   2  * Applied Micro X-Gene SoC Ethernet v2 Driver
   3  *
   4  * Copyright (c) 2017, Applied Micro Circuits Corporation
   5  * Author(s): Iyappan Subramanian <isubramanian@apm.com>
   6  *            Keyur Chudgar <kchudgar@apm.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #ifndef __XGENE_ENET_V2_RING_H__
  23 #define __XGENE_ENET_V2_RING_H__
  24
  25 #define XGENE_ENET_DESC_SIZE    64
  26 #define XGENE_ENET_NUM_DESC     256
  27 #define NUM_BUFS                8
  28 #define SLOT_EMPTY              0xfff
  29
  30 #define DMATXCTRL               0xa180
  31 #define DMATXDESCL              0xa184
  32 #define DMATXDESCH              0xa1a0
  33 #define DMATXSTATUS             0xa188
  34 #define DMARXCTRL               0xa18c
  35 #define DMARXDESCL              0xa190
  36 #define DMARXDESCH              0xa1a4
  37 #define DMARXSTATUS             0xa194
  38 #define DMAINTRMASK             0xa198
  39 #define DMAINTERRUPT            0xa19c
  40
  41 #define D_POS                   62
  42 #define D_LEN                   2
  43 #define E_POS                   63
  44 #define E_LEN                   1
  45 #define PKT_ADDRL_POS           0
  46 #define PKT_ADDRL_LEN           32
  47 #define PKT_ADDRH_POS           32
  48 #define PKT_ADDRH_LEN           10
  49 #define PKT_SIZE_POS            32
  50 #define PKT_SIZE_LEN            12
  51 #define NEXT_DESC_ADDRL_POS     0
  52 #define NEXT_DESC_ADDRL_LEN     32
  53 #define NEXT_DESC_ADDRH_POS     48
  54 #define NEXT_DESC_ADDRH_LEN     10
  55
  56 #define TXPKTCOUNT_POS          16
  57 #define TXPKTCOUNT_LEN          8
  58 #define RXPKTCOUNT_POS          16
  59 #define RXPKTCOUNT_LEN          8
  60
  61 #define TX_PKT_SENT             BIT(0)
  62 #define TX_BUS_ERROR            BIT(3)
  63 #define RX_PKT_RCVD             BIT(4)
  64 #define RX_BUS_ERROR            BIT(7)
  65 #define RXSTATUS_RXPKTRCVD      BIT(0)
  66
  67 struct xge_raw_desc {
  68         __le64 m0;
  69         __le64 m1;
  70         __le64 m2;
  71         __le64 m3;
  72         __le64 m4;
  73         __le64 m5;
  74         __le64 m6;
  75         __le64 m7;
  76 };
  77
  78 struct pkt_info {
  79         struct sk_buff *skb;
  80         dma_addr_t dma_addr;
  81         void *pkt_buf;
  82 };
  83
  84 /* software context of a descriptor ring */
  85 struct xge_desc_ring {
  86         struct net_device *ndev;
  87         dma_addr_t dma_addr;
  88         u8 head;
  89         u8 tail;
  90         union {
  91                 void *desc_addr;
  92                 struct xge_raw_desc *raw_desc;
  93         };
  94         struct pkt_info (*pkt_info);
  95 };
  96
  97 static inline u64 xge_set_desc_bits(int pos, int len, u64 val)
  98 {
  99         return (val & ((1ULL << len) - 1)) << pos;
 100 }
 101
 102 static inline u64 xge_get_desc_bits(int pos, int len, u64 src)
 103 {
 104         return (src >> pos) & ((1ULL << len) - 1);
 105 }
 106
 107 #define SET_BITS(field, val) \
 108                 xge_set_desc_bits(field ## _POS, field ## _LEN, val)
 109
 110 #define GET_BITS(field, src) \
 111                 xge_get_desc_bits(field ## _POS, field ## _LEN, src)
 112
 113 void xge_setup_desc(struct xge_desc_ring *ring);
 114 void xge_update_tx_desc_addr(struct xge_pdata *pdata);
 115 void xge_update_rx_desc_addr(struct xge_pdata *pdata);
 116 void xge_intr_enable(struct xge_pdata *pdata);
 117 void xge_intr_disable(struct xge_pdata *pdata);
 118
 119 #endif  /* __XGENE_ENET_V2_RING_H__ */