drivers/net/wireless/mediatek/mt7601u/dma.h

   1 /*
   2  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #ifndef __MT7601U_DMA_H
  16 #define __MT7601U_DMA_H
  17
  18 #include <asm/unaligned.h>
  19 #include <linux/skbuff.h>
  20
  21 #define MT_DMA_HDR_LEN                  4
  22 #define MT_RX_INFO_LEN                  4
  23 #define MT_FCE_INFO_LEN                 4
  24 #define MT_DMA_HDRS                     (MT_DMA_HDR_LEN + MT_RX_INFO_LEN)
  25
  26 /* Common Tx DMA descriptor fields */
  27 #define MT_TXD_INFO_LEN                 GENMASK(15, 0)
  28 #define MT_TXD_INFO_D_PORT              GENMASK(29, 27)
  29 #define MT_TXD_INFO_TYPE                GENMASK(31, 30)
  30
  31 enum mt76_msg_port {
  32         WLAN_PORT,
  33         CPU_RX_PORT,
  34         CPU_TX_PORT,
  35         HOST_PORT,
  36         VIRTUAL_CPU_RX_PORT,
  37         VIRTUAL_CPU_TX_PORT,
  38         DISCARD,
  39 };
  40
  41 enum mt76_info_type {
  42         DMA_PACKET,
  43         DMA_COMMAND,
  44 };
  45
  46 /* Tx DMA packet specific flags */
  47 #define MT_TXD_PKT_INFO_NEXT_VLD        BIT(16)
  48 #define MT_TXD_PKT_INFO_TX_BURST        BIT(17)
  49 #define MT_TXD_PKT_INFO_80211           BIT(19)
  50 #define MT_TXD_PKT_INFO_TSO             BIT(20)
  51 #define MT_TXD_PKT_INFO_CSO             BIT(21)
  52 #define MT_TXD_PKT_INFO_WIV             BIT(24)
  53 #define MT_TXD_PKT_INFO_QSEL            GENMASK(26, 25)
  54
  55 enum mt76_qsel {
  56         MT_QSEL_MGMT,
  57         MT_QSEL_HCCA,
  58         MT_QSEL_EDCA,
  59         MT_QSEL_EDCA_2,
  60 };
  61
  62 /* Tx DMA MCU command specific flags */
  63 #define MT_TXD_CMD_INFO_SEQ             GENMASK(19, 16)
  64 #define MT_TXD_CMD_INFO_TYPE            GENMASK(26, 20)
  65
  66 static inline int mt7601u_dma_skb_wrap(struct sk_buff *skb,
  67                                        enum mt76_msg_port d_port,
  68                                        enum mt76_info_type type, u32 flags)
  69 {
  70         u32 info;
  71
  72         /* Buffer layout:
  73          *      |   4B   | xfer len |      pad       |  4B  |
  74          *      | TXINFO | pkt/cmd  | zero pad to 4B | zero |
  75          *
  76          * length field of TXINFO should be set to 'xfer len'.
  77          */
  78
  79         info = flags |
  80                 FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) |
  81                 FIELD_PREP(MT_TXD_INFO_D_PORT, d_port) |
  82                 FIELD_PREP(MT_TXD_INFO_TYPE, type);
  83
  84         put_unaligned_le32(info, skb_push(skb, sizeof(info)));
  85         return skb_put_padto(skb, round_up(skb->len, 4) + 4);
  86 }
  87
  88 static inline int
  89 mt7601u_dma_skb_wrap_pkt(struct sk_buff *skb, enum mt76_qsel qsel, u32 flags)
  90 {
  91         flags |= FIELD_PREP(MT_TXD_PKT_INFO_QSEL, qsel);
  92         return mt7601u_dma_skb_wrap(skb, WLAN_PORT, DMA_PACKET, flags);
  93 }
  94
  95 /* Common Rx DMA descriptor fields */
  96 #define MT_RXD_INFO_LEN                 GENMASK(13, 0)
  97 #define MT_RXD_INFO_PCIE_INTR           BIT(24)
  98 #define MT_RXD_INFO_QSEL                GENMASK(26, 25)
  99 #define MT_RXD_INFO_PORT                GENMASK(29, 27)
 100 #define MT_RXD_INFO_TYPE                GENMASK(31, 30)
 101
 102 /* Rx DMA packet specific flags */
 103 #define MT_RXD_PKT_INFO_UDP_ERR         BIT(16)
 104 #define MT_RXD_PKT_INFO_TCP_ERR         BIT(17)
 105 #define MT_RXD_PKT_INFO_IP_ERR          BIT(18)
 106 #define MT_RXD_PKT_INFO_PKT_80211       BIT(19)
 107 #define MT_RXD_PKT_INFO_L3L4_DONE       BIT(20)
 108 #define MT_RXD_PKT_INFO_MAC_LEN         GENMASK(23, 21)
 109
 110 /* Rx DMA MCU command specific flags */
 111 #define MT_RXD_CMD_INFO_SELF_GEN        BIT(15)
 112 #define MT_RXD_CMD_INFO_CMD_SEQ         GENMASK(19, 16)
 113 #define MT_RXD_CMD_INFO_EVT_TYPE        GENMASK(23, 20)
 114
 115 enum mt76_evt_type {
 116         CMD_DONE,
 117         CMD_ERROR,
 118         CMD_RETRY,
 119         EVENT_PWR_RSP,
 120         EVENT_WOW_RSP,
 121         EVENT_CARRIER_DETECT_RSP,
 122         EVENT_DFS_DETECT_RSP,
 123 };
 124
 125 #endif