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
61 struct 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
106 void wl1251_rx(struct wl1251 *wl);
107
108 #endif