1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * This file is part of wl1251
  4 *
  5 * Copyright (c) 1998-2007 Texas Instruments Incorporated
  6 * Copyright (C) 2008 Nokia Corporation
  7 */
  8
  9#ifndef __WL1251_RX_H__
 10#define __WL1251_RX_H__
 11
 12#include <linux/bitops.h>
 13
 14#include "wl1251.h"
 15
 16/*
 17 * RX PATH
 18 *
 19 * The Rx path uses a double buffer and an rx_contro structure, each located
 20 * at a fixed address in the device memory. The host keeps track of which
 21 * buffer is available and alternates between them on a per packet basis.
 22 * The size of each of the two buffers is large enough to hold the longest
 23 * 802.3 packet.
 24 * The RX path goes like that:
 25 * 1) The target generates an interrupt each time a new packet is received.
 26 *   There are 2 RX interrupts, one for each buffer.
 27 * 2) The host reads the received packet from one of the double buffers.
 28 * 3) The host triggers a target interrupt.
 29 * 4) The target prepares the next RX packet.
 30 */
 31
 32#define WL1251_RX_MAX_RSSI -30
 33#define WL1251_RX_MIN_RSSI -95
 34
 35#define WL1251_RX_ALIGN_TO 4
 36#define WL1251_RX_ALIGN(len) (((len) + WL1251_RX_ALIGN_TO - 1) & \
 37			     ~(WL1251_RX_ALIGN_TO - 1))
 38
 39#define SHORT_PREAMBLE_BIT   BIT(0)
 40#define OFDM_RATE_BIT        BIT(6)
 41#define PBCC_RATE_BIT        BIT(7)
 42
 43#define PLCP_HEADER_LENGTH 8
 44#define RX_DESC_PACKETID_SHIFT 11
 45#define RX_MAX_PACKET_ID 3
 46
 47#define RX_DESC_VALID_FCS         0x0001
 48#define RX_DESC_MATCH_RXADDR1     0x0002
 49#define RX_DESC_MCAST             0x0004
 50#define RX_DESC_STAINTIM          0x0008
 51#define RX_DESC_VIRTUAL_BM        0x0010
 52#define RX_DESC_BCAST             0x0020
 53#define RX_DESC_MATCH_SSID        0x0040
 54#define RX_DESC_MATCH_BSSID       0x0080
 55#define RX_DESC_ENCRYPTION_MASK   0x0300
 56#define RX_DESC_MEASURMENT        0x0400
 57#define RX_DESC_SEQNUM_MASK       0x1800
 58#define	RX_DESC_MIC_FAIL	  0x2000
 59#define	RX_DESC_DECRYPT_FAIL	  0x4000
 60
 61struct wl1251_rx_descriptor {
 62	u32 timestamp; /* In microseconds */
 63	u16 length; /* Paylod length, including headers */
 64	u16 flags;
 65
 66	/*
 67	 * 0 - 802.11
 68	 * 1 - 802.3
 69	 * 2 - IP
 70	 * 3 - Raw Codec
 71	 */
 72	u8 type;
 73
 74	/*
 75	 * Received Rate:
 76	 * 0x0A - 1MBPS
 77	 * 0x14 - 2MBPS
 78	 * 0x37 - 5_5MBPS
 79	 * 0x0B - 6MBPS
 80	 * 0x0F - 9MBPS
 81	 * 0x6E - 11MBPS
 82	 * 0x0A - 12MBPS
 83	 * 0x0E - 18MBPS
 84	 * 0xDC - 22MBPS
 85	 * 0x09 - 24MBPS
 86	 * 0x0D - 36MBPS
 87	 * 0x08 - 48MBPS
 88	 * 0x0C - 54MBPS
 89	 */
 90	u8 rate;
 91
 92	u8 mod_pre; /* Modulation and preamble */
 93	u8 channel;
 94
 95	/*
 96	 * 0 - 2.4 Ghz
 97	 * 1 - 5 Ghz
 98	 */
 99	u8 band;
100
101	s8 rssi; /* in dB */
102	u8 rcpi; /* in dB */
103	u8 snr; /* in dB */
104} __packed;
105
106void wl1251_rx(struct wl1251 *wl);
107
108#endif