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
 31enum 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
 41enum 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
 55enum 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
 66static 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
 88static inline int
 89mt7601u_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
115enum 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