1 /* 2 * This file is part of wl1251 3 * 4 * Copyright (c) 1998-2007 Texas Instruments Incorporated 5 * Copyright (C) 2008 Nokia Corporation 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * version 2 as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 19 * 02110-1301 USA 20 * 21 */ 22 23 #ifndef __WL1251_RX_H__ 24 #define __WL1251_RX_H__ 25 26 #include <linux/bitops.h> 27 28 #include "wl1251.h" 29 30 /* 31 * RX PATH 32 * 33 * The Rx path uses a double buffer and an rx_contro structure, each located 34 * at a fixed address in the device memory. The host keeps track of which 35 * buffer is available and alternates between them on a per packet basis. 36 * The size of each of the two buffers is large enough to hold the longest 37 * 802.3 packet. 38 * The RX path goes like that: 39 * 1) The target generates an interrupt each time a new packet is received. 40 * There are 2 RX interrupts, one for each buffer. 41 * 2) The host reads the received packet from one of the double buffers. 42 * 3) The host triggers a target interrupt. 43 * 4) The target prepares the next RX packet. 44 */ 45 46 #define WL1251_RX_MAX_RSSI -30 47 #define WL1251_RX_MIN_RSSI -95 48 49 #define WL1251_RX_ALIGN_TO 4 50 #define WL1251_RX_ALIGN(len) (((len) + WL1251_RX_ALIGN_TO - 1) & \ 51 ~(WL1251_RX_ALIGN_TO - 1)) 52 53 #define SHORT_PREAMBLE_BIT BIT(0) 54 #define OFDM_RATE_BIT BIT(6) 55 #define PBCC_RATE_BIT BIT(7) 56 57 #define PLCP_HEADER_LENGTH 8 58 #define RX_DESC_PACKETID_SHIFT 11 59 #define RX_MAX_PACKET_ID 3 60 61 #define RX_DESC_VALID_FCS 0x0001 62 #define RX_DESC_MATCH_RXADDR1 0x0002 63 #define RX_DESC_MCAST 0x0004 64 #define RX_DESC_STAINTIM 0x0008 65 #define RX_DESC_VIRTUAL_BM 0x0010 66 #define RX_DESC_BCAST 0x0020 67 #define RX_DESC_MATCH_SSID 0x0040 68 #define RX_DESC_MATCH_BSSID 0x0080 69 #define RX_DESC_ENCRYPTION_MASK 0x0300 70 #define RX_DESC_MEASURMENT 0x0400 71 #define RX_DESC_SEQNUM_MASK 0x1800 72 #define RX_DESC_MIC_FAIL 0x2000 73 #define RX_DESC_DECRYPT_FAIL 0x4000 74 75 struct wl1251_rx_descriptor { 76 u32 timestamp; /* In microseconds */ 77 u16 length; /* Paylod length, including headers */ 78 u16 flags; 79 80 /* 81 * 0 - 802.11 82 * 1 - 802.3 83 * 2 - IP 84 * 3 - Raw Codec 85 */ 86 u8 type; 87 88 /* 89 * Received Rate: 90 * 0x0A - 1MBPS 91 * 0x14 - 2MBPS 92 * 0x37 - 5_5MBPS 93 * 0x0B - 6MBPS 94 * 0x0F - 9MBPS 95 * 0x6E - 11MBPS 96 * 0x0A - 12MBPS 97 * 0x0E - 18MBPS 98 * 0xDC - 22MBPS 99 * 0x09 - 24MBPS 100 * 0x0D - 36MBPS 101 * 0x08 - 48MBPS 102 * 0x0C - 54MBPS 103 */ 104 u8 rate; 105 106 u8 mod_pre; /* Modulation and preamble */ 107 u8 channel; 108 109 /* 110 * 0 - 2.4 Ghz 111 * 1 - 5 Ghz 112 */ 113 u8 band; 114 115 s8 rssi; /* in dB */ 116 u8 rcpi; /* in dB */ 117 u8 snr; /* in dB */ 118 } __packed; 119 120 void wl1251_rx(struct wl1251 *wl); 121 122 #endif 123