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 109