1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
4  * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
5  */
6 
7 #ifndef __MT7601U_DMA_H
8 #define __MT7601U_DMA_H
9 
10 #include <asm/unaligned.h>
11 #include <linux/skbuff.h>
12 
13 #define MT_DMA_HDR_LEN			4
14 #define MT_RX_INFO_LEN			4
15 #define MT_FCE_INFO_LEN			4
16 #define MT_DMA_HDRS			(MT_DMA_HDR_LEN + MT_RX_INFO_LEN)
17 
18 /* Common Tx DMA descriptor fields */
19 #define MT_TXD_INFO_LEN			GENMASK(15, 0)
20 #define MT_TXD_INFO_D_PORT		GENMASK(29, 27)
21 #define MT_TXD_INFO_TYPE		GENMASK(31, 30)
22 
23 enum mt76_msg_port {
24 	WLAN_PORT,
25 	CPU_RX_PORT,
26 	CPU_TX_PORT,
27 	HOST_PORT,
28 	VIRTUAL_CPU_RX_PORT,
29 	VIRTUAL_CPU_TX_PORT,
30 	DISCARD,
31 };
32 
33 enum mt76_info_type {
34 	DMA_PACKET,
35 	DMA_COMMAND,
36 };
37 
38 /* Tx DMA packet specific flags */
39 #define MT_TXD_PKT_INFO_NEXT_VLD	BIT(16)
40 #define MT_TXD_PKT_INFO_TX_BURST	BIT(17)
41 #define MT_TXD_PKT_INFO_80211		BIT(19)
42 #define MT_TXD_PKT_INFO_TSO		BIT(20)
43 #define MT_TXD_PKT_INFO_CSO		BIT(21)
44 #define MT_TXD_PKT_INFO_WIV		BIT(24)
45 #define MT_TXD_PKT_INFO_QSEL		GENMASK(26, 25)
46 
47 enum mt76_qsel {
48 	MT_QSEL_MGMT,
49 	MT_QSEL_HCCA,
50 	MT_QSEL_EDCA,
51 	MT_QSEL_EDCA_2,
52 };
53 
54 /* Tx DMA MCU command specific flags */
55 #define MT_TXD_CMD_INFO_SEQ		GENMASK(19, 16)
56 #define MT_TXD_CMD_INFO_TYPE		GENMASK(26, 20)
57 
58 static inline int mt7601u_dma_skb_wrap(struct sk_buff *skb,
59 				       enum mt76_msg_port d_port,
60 				       enum mt76_info_type type, u32 flags)
61 {
62 	u32 info;
63 
64 	/* Buffer layout:
65 	 *	|   4B   | xfer len |      pad       |  4B  |
66 	 *	| TXINFO | pkt/cmd  | zero pad to 4B | zero |
67 	 *
68 	 * length field of TXINFO should be set to 'xfer len'.
69 	 */
70 
71 	info = flags |
72 		FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) |
73 		FIELD_PREP(MT_TXD_INFO_D_PORT, d_port) |
74 		FIELD_PREP(MT_TXD_INFO_TYPE, type);
75 
76 	put_unaligned_le32(info, skb_push(skb, sizeof(info)));
77 	return skb_put_padto(skb, round_up(skb->len, 4) + 4);
78 }
79 
80 static inline int
81 mt7601u_dma_skb_wrap_pkt(struct sk_buff *skb, enum mt76_qsel qsel, u32 flags)
82 {
83 	flags |= FIELD_PREP(MT_TXD_PKT_INFO_QSEL, qsel);
84 	return mt7601u_dma_skb_wrap(skb, WLAN_PORT, DMA_PACKET, flags);
85 }
86 
87 /* Common Rx DMA descriptor fields */
88 #define MT_RXD_INFO_LEN			GENMASK(13, 0)
89 #define MT_RXD_INFO_PCIE_INTR		BIT(24)
90 #define MT_RXD_INFO_QSEL		GENMASK(26, 25)
91 #define MT_RXD_INFO_PORT		GENMASK(29, 27)
92 #define MT_RXD_INFO_TYPE		GENMASK(31, 30)
93 
94 /* Rx DMA packet specific flags */
95 #define MT_RXD_PKT_INFO_UDP_ERR		BIT(16)
96 #define MT_RXD_PKT_INFO_TCP_ERR		BIT(17)
97 #define MT_RXD_PKT_INFO_IP_ERR		BIT(18)
98 #define MT_RXD_PKT_INFO_PKT_80211	BIT(19)
99 #define MT_RXD_PKT_INFO_L3L4_DONE	BIT(20)
100 #define MT_RXD_PKT_INFO_MAC_LEN		GENMASK(23, 21)
101 
102 /* Rx DMA MCU command specific flags */
103 #define MT_RXD_CMD_INFO_SELF_GEN	BIT(15)
104 #define MT_RXD_CMD_INFO_CMD_SEQ		GENMASK(19, 16)
105 #define MT_RXD_CMD_INFO_EVT_TYPE	GENMASK(23, 20)
106 
107 enum mt76_evt_type {
108 	CMD_DONE,
109 	CMD_ERROR,
110 	CMD_RETRY,
111 	EVENT_PWR_RSP,
112 	EVENT_WOW_RSP,
113 	EVENT_CARRIER_DETECT_RSP,
114 	EVENT_DFS_DETECT_RSP,
115 };
116 
117 #endif
118