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
mt7601u_dma_skb_wrap(struct sk_buff * skb,enum mt76_msg_port d_port,enum mt76_info_type type,u32 flags)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
mt7601u_dma_skb_wrap_pkt(struct sk_buff * skb,enum mt76_qsel qsel,u32 flags)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
126