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 #include "util.h"
22 
23 #define MT_DMA_HDR_LEN			4
24 #define MT_RX_INFO_LEN			4
25 #define MT_FCE_INFO_LEN			4
26 #define MT_DMA_HDRS			(MT_DMA_HDR_LEN + MT_RX_INFO_LEN)
27 
28 /* Common Tx DMA descriptor fields */
29 #define MT_TXD_INFO_LEN			GENMASK(15, 0)
30 #define MT_TXD_INFO_D_PORT		GENMASK(29, 27)
31 #define MT_TXD_INFO_TYPE		GENMASK(31, 30)
32 
33 enum mt76_msg_port {
34 	WLAN_PORT,
35 	CPU_RX_PORT,
36 	CPU_TX_PORT,
37 	HOST_PORT,
38 	VIRTUAL_CPU_RX_PORT,
39 	VIRTUAL_CPU_TX_PORT,
40 	DISCARD,
41 };
42 
43 enum mt76_info_type {
44 	DMA_PACKET,
45 	DMA_COMMAND,
46 };
47 
48 /* Tx DMA packet specific flags */
49 #define MT_TXD_PKT_INFO_NEXT_VLD	BIT(16)
50 #define MT_TXD_PKT_INFO_TX_BURST	BIT(17)
51 #define MT_TXD_PKT_INFO_80211		BIT(19)
52 #define MT_TXD_PKT_INFO_TSO		BIT(20)
53 #define MT_TXD_PKT_INFO_CSO		BIT(21)
54 #define MT_TXD_PKT_INFO_WIV		BIT(24)
55 #define MT_TXD_PKT_INFO_QSEL		GENMASK(26, 25)
56 
57 enum mt76_qsel {
58 	MT_QSEL_MGMT,
59 	MT_QSEL_HCCA,
60 	MT_QSEL_EDCA,
61 	MT_QSEL_EDCA_2,
62 };
63 
64 /* Tx DMA MCU command specific flags */
65 #define MT_TXD_CMD_INFO_SEQ		GENMASK(19, 16)
66 #define MT_TXD_CMD_INFO_TYPE		GENMASK(26, 20)
67 
68 static inline int mt7601u_dma_skb_wrap(struct sk_buff *skb,
69 				       enum mt76_msg_port d_port,
70 				       enum mt76_info_type type, u32 flags)
71 {
72 	u32 info;
73 
74 	/* Buffer layout:
75 	 *	|   4B   | xfer len |      pad       |  4B  |
76 	 *	| TXINFO | pkt/cmd  | zero pad to 4B | zero |
77 	 *
78 	 * length field of TXINFO should be set to 'xfer len'.
79 	 */
80 
81 	info = flags |
82 		MT76_SET(MT_TXD_INFO_LEN, round_up(skb->len, 4)) |
83 		MT76_SET(MT_TXD_INFO_D_PORT, d_port) |
84 		MT76_SET(MT_TXD_INFO_TYPE, type);
85 
86 	put_unaligned_le32(info, skb_push(skb, sizeof(info)));
87 	return skb_put_padto(skb, round_up(skb->len, 4) + 4);
88 }
89 
90 static inline int
91 mt7601u_dma_skb_wrap_pkt(struct sk_buff *skb, enum mt76_qsel qsel, u32 flags)
92 {
93 	flags |= MT76_SET(MT_TXD_PKT_INFO_QSEL, qsel);
94 	return mt7601u_dma_skb_wrap(skb, WLAN_PORT, DMA_PACKET, flags);
95 }
96 
97 /* Common Rx DMA descriptor fields */
98 #define MT_RXD_INFO_LEN			GENMASK(13, 0)
99 #define MT_RXD_INFO_PCIE_INTR		BIT(24)
100 #define MT_RXD_INFO_QSEL		GENMASK(26, 25)
101 #define MT_RXD_INFO_PORT		GENMASK(29, 27)
102 #define MT_RXD_INFO_TYPE		GENMASK(31, 30)
103 
104 /* Rx DMA packet specific flags */
105 #define MT_RXD_PKT_INFO_UDP_ERR		BIT(16)
106 #define MT_RXD_PKT_INFO_TCP_ERR		BIT(17)
107 #define MT_RXD_PKT_INFO_IP_ERR		BIT(18)
108 #define MT_RXD_PKT_INFO_PKT_80211	BIT(19)
109 #define MT_RXD_PKT_INFO_L3L4_DONE	BIT(20)
110 #define MT_RXD_PKT_INFO_MAC_LEN		GENMASK(23, 21)
111 
112 /* Rx DMA MCU command specific flags */
113 #define MT_RXD_CMD_INFO_SELF_GEN	BIT(15)
114 #define MT_RXD_CMD_INFO_CMD_SEQ		GENMASK(19, 16)
115 #define MT_RXD_CMD_INFO_EVT_TYPE	GENMASK(23, 20)
116 
117 enum mt76_evt_type {
118 	CMD_DONE,
119 	CMD_ERROR,
120 	CMD_RETRY,
121 	EVENT_PWR_RSP,
122 	EVENT_WOW_RSP,
123 	EVENT_CARRIER_DETECT_RSP,
124 	EVENT_DFS_DETECT_RSP,
125 };
126 
127 #endif
128