/*
 * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
 * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef __MT76X0U_DMA_H
#define __MT76X0U_DMA_H

#include <asm/unaligned.h>
#include <linux/skbuff.h>

#define MT_DMA_HDR_LEN			4
#define MT_RX_INFO_LEN			4
#define MT_FCE_INFO_LEN			4
#define MT_DMA_HDRS			(MT_DMA_HDR_LEN + MT_RX_INFO_LEN)

/* Common Tx DMA descriptor fields */
#define MT_TXD_INFO_LEN		GENMASK(15, 0)
#define MT_TXD_INFO_D_PORT	GENMASK(29, 27)
#define MT_TXD_INFO_TYPE	GENMASK(31, 30)

/* Tx DMA MCU command specific flags */
#define MT_TXD_CMD_SEQ		GENMASK(19, 16)
#define MT_TXD_CMD_TYPE		GENMASK(26, 20)

enum mt76_msg_port {
	WLAN_PORT,
	CPU_RX_PORT,
	CPU_TX_PORT,
	HOST_PORT,
	VIRTUAL_CPU_RX_PORT,
	VIRTUAL_CPU_TX_PORT,
	DISCARD,
};

enum mt76_info_type {
	DMA_PACKET,
	DMA_COMMAND,
};

/* Tx DMA packet specific flags */
#define MT_TXD_PKT_INFO_NEXT_VLD	BIT(16)
#define MT_TXD_PKT_INFO_TX_BURST	BIT(17)
#define MT_TXD_PKT_INFO_80211		BIT(19)
#define MT_TXD_PKT_INFO_TSO		BIT(20)
#define MT_TXD_PKT_INFO_CSO		BIT(21)
#define MT_TXD_PKT_INFO_WIV		BIT(24)
#define MT_TXD_PKT_INFO_QSEL		GENMASK(26, 25)

enum mt76_qsel {
	MT_QSEL_MGMT,
	MT_QSEL_HCCA,
	MT_QSEL_EDCA,
	MT_QSEL_EDCA_2,
};


static inline int mt76x0_dma_skb_wrap(struct sk_buff *skb,
				       enum mt76_msg_port d_port,
				       enum mt76_info_type type, u32 flags)
{
	u32 info;

	/* Buffer layout:
	 *	|   4B   | xfer len |      pad       |  4B  |
	 *	| TXINFO | pkt/cmd  | zero pad to 4B | zero |
	 *
	 * length field of TXINFO should be set to 'xfer len'.
	 */

	info = flags |
		FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) |
		FIELD_PREP(MT_TXD_INFO_D_PORT, d_port) |
		FIELD_PREP(MT_TXD_INFO_TYPE, type);

	put_unaligned_le32(info, skb_push(skb, sizeof(info)));
	return skb_put_padto(skb, round_up(skb->len, 4) + 4);
}

static inline int
mt76x0_dma_skb_wrap_pkt(struct sk_buff *skb, enum mt76_qsel qsel, u32 flags)
{
	flags |= FIELD_PREP(MT_TXD_PKT_INFO_QSEL, qsel);
	return mt76x0_dma_skb_wrap(skb, WLAN_PORT, DMA_PACKET, flags);
}

/* Common Rx DMA descriptor fields */
#define MT_RXD_INFO_LEN			GENMASK(13, 0)
#define MT_RXD_INFO_PCIE_INTR		BIT(24)
#define MT_RXD_INFO_QSEL		GENMASK(26, 25)
#define MT_RXD_INFO_PORT		GENMASK(29, 27)
#define MT_RXD_INFO_TYPE		GENMASK(31, 30)

/* Rx DMA packet specific flags */
#define MT_RXD_PKT_INFO_UDP_ERR		BIT(16)
#define MT_RXD_PKT_INFO_TCP_ERR		BIT(17)
#define MT_RXD_PKT_INFO_IP_ERR		BIT(18)
#define MT_RXD_PKT_INFO_PKT_80211	BIT(19)
#define MT_RXD_PKT_INFO_L3L4_DONE	BIT(20)
#define MT_RXD_PKT_INFO_MAC_LEN		GENMASK(23, 21)

/* Rx DMA MCU command specific flags */
#define MT_RXD_CMD_INFO_SELF_GEN	BIT(15)
#define MT_RXD_CMD_INFO_CMD_SEQ		GENMASK(19, 16)
#define MT_RXD_CMD_INFO_EVT_TYPE	GENMASK(23, 20)

enum mt76_evt_type {
	CMD_DONE,
	CMD_ERROR,
	CMD_RETRY,
	EVENT_PWR_RSP,
	EVENT_WOW_RSP,
	EVENT_CARRIER_DETECT_RSP,
	EVENT_DFS_DETECT_RSP,
};

#endif