drivers/net/wireless/zd1211rw/zd_mac.h

   1 /* ZD1211 USB-WLAN driver for Linux
   2  *
   3  * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
   4  * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU 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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef _ZD_MAC_H
  21 #define _ZD_MAC_H
  22
  23 #include <linux/kernel.h>
  24 #include <net/mac80211.h>
  25
  26 #include "zd_chip.h"
  27
  28 struct zd_ctrlset {
  29         u8     modulation;
  30         __le16 tx_length;
  31         u8     control;
  32         /* stores only the difference to tx_length on ZD1211B */
  33         __le16 packet_length;
  34         __le16 current_length;
  35         u8     service;
  36         __le16  next_frame_length;
  37 } __packed;
  38
  39 #define ZD_CS_RESERVED_SIZE     25
  40
  41 /* The field modulation of struct zd_ctrlset controls the bit rate, the use
  42  * of short or long preambles in 802.11b (CCK mode) or the use of 802.11a or
  43  * 802.11g in OFDM mode.
  44  *
  45  * The term zd-rate is used for the combination of the modulation type flag
  46  * and the "pure" rate value.
  47  */
  48 #define ZD_PURE_RATE_MASK       0x0f
  49 #define ZD_MODULATION_TYPE_MASK 0x10
  50 #define ZD_RATE_MASK            (ZD_PURE_RATE_MASK|ZD_MODULATION_TYPE_MASK)
  51 #define ZD_PURE_RATE(modulation) ((modulation) & ZD_PURE_RATE_MASK)
  52 #define ZD_MODULATION_TYPE(modulation) ((modulation) & ZD_MODULATION_TYPE_MASK)
  53 #define ZD_RATE(modulation) ((modulation) & ZD_RATE_MASK)
  54
  55 /* The two possible modulation types. Notify that 802.11b doesn't use the CCK
  56  * codeing for the 1 and 2 MBit/s rate. We stay with the term here to remain
  57  * consistent with uses the term at other places.
  58  */
  59 #define ZD_CCK                  0x00
  60 #define ZD_OFDM                 0x10
  61
  62 /* The ZD1211 firmware uses proprietary encodings of the 802.11b (CCK) rates.
  63  * For OFDM the PLCP rate encodings are used. We combine these "pure" rates
  64  * with the modulation type flag and call the resulting values zd-rates.
  65  */
  66 #define ZD_CCK_RATE_1M          (ZD_CCK|0x00)
  67 #define ZD_CCK_RATE_2M          (ZD_CCK|0x01)
  68 #define ZD_CCK_RATE_5_5M        (ZD_CCK|0x02)
  69 #define ZD_CCK_RATE_11M         (ZD_CCK|0x03)
  70 #define ZD_OFDM_RATE_6M         (ZD_OFDM|ZD_OFDM_PLCP_RATE_6M)
  71 #define ZD_OFDM_RATE_9M         (ZD_OFDM|ZD_OFDM_PLCP_RATE_9M)
  72 #define ZD_OFDM_RATE_12M        (ZD_OFDM|ZD_OFDM_PLCP_RATE_12M)
  73 #define ZD_OFDM_RATE_18M        (ZD_OFDM|ZD_OFDM_PLCP_RATE_18M)
  74 #define ZD_OFDM_RATE_24M        (ZD_OFDM|ZD_OFDM_PLCP_RATE_24M)
  75 #define ZD_OFDM_RATE_36M        (ZD_OFDM|ZD_OFDM_PLCP_RATE_36M)
  76 #define ZD_OFDM_RATE_48M        (ZD_OFDM|ZD_OFDM_PLCP_RATE_48M)
  77 #define ZD_OFDM_RATE_54M        (ZD_OFDM|ZD_OFDM_PLCP_RATE_54M)
  78
  79 /* The bit 5 of the zd_ctrlset modulation field controls the preamble in CCK
  80  * mode or the 802.11a/802.11g selection in OFDM mode.
  81  */
  82 #define ZD_CCK_PREA_LONG        0x00
  83 #define ZD_CCK_PREA_SHORT       0x20
  84 #define ZD_OFDM_MODE_11G        0x00
  85 #define ZD_OFDM_MODE_11A        0x20
  86
  87 /* zd_ctrlset control field */
  88 #define ZD_CS_NEED_RANDOM_BACKOFF       0x01
  89 #define ZD_CS_NO_ACK                    0x02
  90
  91 #define ZD_CS_FRAME_TYPE_MASK           0x0c
  92 #define ZD_CS_DATA_FRAME                0x00
  93 #define ZD_CS_PS_POLL_FRAME             0x04
  94 #define ZD_CS_MANAGEMENT_FRAME          0x08
  95 #define ZD_CS_NO_SEQUENCE_CTL_FRAME     0x0c
  96
  97 #define ZD_CS_WAKE_DESTINATION          0x10
  98 #define ZD_CS_RTS                       0x20
  99 #define ZD_CS_ENCRYPT                   0x40
 100 #define ZD_CS_SELF_CTS                  0x80
 101
 102 /* Incoming frames are prepended by a PLCP header */
 103 #define ZD_PLCP_HEADER_SIZE             5
 104
 105 struct rx_length_info {
 106         __le16 length[3];
 107         __le16 tag;
 108 } __packed;
 109
 110 #define RX_LENGTH_INFO_TAG              0x697e
 111
 112 struct rx_status {
 113         u8 signal_quality_cck;
 114         /* rssi */
 115         u8 signal_strength;
 116         u8 signal_quality_ofdm;
 117         u8 decryption_type;
 118         u8 frame_status;
 119 } __packed;
 120
 121 /* rx_status field decryption_type */
 122 #define ZD_RX_NO_WEP    0
 123 #define ZD_RX_WEP64     1
 124 #define ZD_RX_TKIP      2
 125 #define ZD_RX_AES       4
 126 #define ZD_RX_WEP128    5
 127 #define ZD_RX_WEP256    6
 128
 129 /* rx_status field frame_status */
 130 #define ZD_RX_FRAME_MODULATION_MASK     0x01
 131 #define ZD_RX_CCK                       0x00
 132 #define ZD_RX_OFDM                      0x01
 133
 134 #define ZD_RX_TIMEOUT_ERROR             0x02
 135 #define ZD_RX_FIFO_OVERRUN_ERROR        0x04
 136 #define ZD_RX_DECRYPTION_ERROR          0x08
 137 #define ZD_RX_CRC32_ERROR               0x10
 138 #define ZD_RX_NO_ADDR1_MATCH_ERROR      0x20
 139 #define ZD_RX_CRC16_ERROR               0x40
 140 #define ZD_RX_ERROR                     0x80
 141
 142 struct tx_retry_rate {
 143         int count;      /* number of valid element in rate[] array */
 144         int rate[10];   /* retry rates, described by an index in zd_rates[] */
 145 };
 146
 147 struct tx_status {
 148         u8 type;        /* must always be 0x01 : USB_INT_TYPE */
 149         u8 id;          /* must always be 0xa0 : USB_INT_ID_RETRY_FAILED */
 150         u8 rate;
 151         u8 pad;
 152         u8 mac[ETH_ALEN];
 153         u8 retry;
 154         u8 failure;
 155 } __packed;
 156
 157 enum mac_flags {
 158         MAC_FIXED_CHANNEL = 0x01,
 159 };
 160
 161 struct housekeeping {
 162         struct delayed_work link_led_work;
 163 };
 164
 165 struct beacon {
 166         struct delayed_work watchdog_work;
 167         struct sk_buff *cur_beacon;
 168         unsigned long last_update;
 169         u16 interval;
 170         u8 period;
 171 };
 172
 173 enum zd_device_flags {
 174         ZD_DEVICE_RUNNING,
 175 };
 176
 177 #define ZD_MAC_STATS_BUFFER_SIZE 16
 178
 179 #define ZD_MAC_MAX_ACK_WAITERS 50
 180
 181 struct zd_mac {
 182         struct zd_chip chip;
 183         spinlock_t lock;
 184         spinlock_t intr_lock;
 185         struct ieee80211_hw *hw;
 186         struct ieee80211_vif *vif;
 187         struct housekeeping housekeeping;
 188         struct beacon beacon;
 189         struct work_struct set_rts_cts_work;
 190         struct work_struct process_intr;
 191         struct zd_mc_hash multicast_hash;
 192         u8 intr_buffer[USB_MAX_EP_INT_BUFFER];
 193         u8 regdomain;
 194         u8 default_regdomain;
 195         u8 channel;
 196         int type;
 197         int associated;
 198         unsigned long flags;
 199         struct sk_buff_head ack_wait_queue;
 200         struct ieee80211_channel channels[14];
 201         struct ieee80211_rate rates[12];
 202         struct ieee80211_supported_band band;
 203
 204         /* Short preamble (used for RTS/CTS) */
 205         unsigned int short_preamble:1;
 206
 207         /* whether to pass frames with CRC errors to stack */
 208         unsigned int pass_failed_fcs:1;
 209
 210         /* whether to pass control frames to stack */
 211         unsigned int pass_ctrl:1;
 212
 213         /* whether we have received a 802.11 ACK that is pending */
 214         unsigned int ack_pending:1;
 215
 216         /* signal strength of the last 802.11 ACK received */
 217         int ack_signal;
 218 };
 219
 220 #define ZD_REGDOMAIN_FCC        0x10
 221 #define ZD_REGDOMAIN_IC         0x20
 222 #define ZD_REGDOMAIN_ETSI       0x30
 223 #define ZD_REGDOMAIN_SPAIN      0x31
 224 #define ZD_REGDOMAIN_FRANCE     0x32
 225 #define ZD_REGDOMAIN_JAPAN_2    0x40
 226 #define ZD_REGDOMAIN_JAPAN      0x41
 227 #define ZD_REGDOMAIN_JAPAN_3    0x49
 228
 229 enum {
 230         MIN_CHANNEL24 = 1,
 231         MAX_CHANNEL24 = 14,
 232 };
 233
 234 #define ZD_PLCP_SERVICE_LENGTH_EXTENSION 0x80
 235
 236 struct ofdm_plcp_header {
 237         u8 prefix[3];
 238         __le16 service;
 239 } __packed;
 240
 241 static inline u8 zd_ofdm_plcp_header_rate(const struct ofdm_plcp_header *header)
 242 {
 243         return header->prefix[0] & 0xf;
 244 }
 245
 246 /* The following defines give the encoding of the 4-bit rate field in the
 247  * OFDM (802.11a/802.11g) PLCP header. Notify that these values are used to
 248  * define the zd-rate values for OFDM.
 249  *
 250  * See the struct zd_ctrlset definition in zd_mac.h.
 251  */
 252 #define ZD_OFDM_PLCP_RATE_6M    0xb
 253 #define ZD_OFDM_PLCP_RATE_9M    0xf
 254 #define ZD_OFDM_PLCP_RATE_12M   0xa
 255 #define ZD_OFDM_PLCP_RATE_18M   0xe
 256 #define ZD_OFDM_PLCP_RATE_24M   0x9
 257 #define ZD_OFDM_PLCP_RATE_36M   0xd
 258 #define ZD_OFDM_PLCP_RATE_48M   0x8
 259 #define ZD_OFDM_PLCP_RATE_54M   0xc
 260
 261 struct cck_plcp_header {
 262         u8 signal;
 263         u8 service;
 264         __le16 length;
 265         __le16 crc16;
 266 } __packed;
 267
 268 static inline u8 zd_cck_plcp_header_signal(const struct cck_plcp_header *header)
 269 {
 270         return header->signal;
 271 }
 272
 273 /* These defines give the encodings of the signal field in the 802.11b PLCP
 274  * header. The signal field gives the bit rate of the following packet. Even
 275  * if technically wrong we use CCK here also for the 1 MBit/s and 2 MBit/s
 276  * rate to stay consistent with Zydas and our use of the term.
 277  *
 278  * Notify that these values are *not* used in the zd-rates.
 279  */
 280 #define ZD_CCK_PLCP_SIGNAL_1M   0x0a
 281 #define ZD_CCK_PLCP_SIGNAL_2M   0x14
 282 #define ZD_CCK_PLCP_SIGNAL_5M5  0x37
 283 #define ZD_CCK_PLCP_SIGNAL_11M  0x6e
 284
 285 static inline struct zd_mac *zd_hw_mac(struct ieee80211_hw *hw)
 286 {
 287         return hw->priv;
 288 }
 289
 290 static inline struct zd_mac *zd_chip_to_mac(struct zd_chip *chip)
 291 {
 292         return container_of(chip, struct zd_mac, chip);
 293 }
 294
 295 static inline struct zd_mac *zd_usb_to_mac(struct zd_usb *usb)
 296 {
 297         return zd_chip_to_mac(zd_usb_to_chip(usb));
 298 }
 299
 300 static inline u8 *zd_mac_get_perm_addr(struct zd_mac *mac)
 301 {
 302         return mac->hw->wiphy->perm_addr;
 303 }
 304
 305 #define zd_mac_dev(mac) (zd_chip_dev(&(mac)->chip))
 306
 307 struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf);
 308 void zd_mac_clear(struct zd_mac *mac);
 309
 310 int zd_mac_preinit_hw(struct ieee80211_hw *hw);
 311 int zd_mac_init_hw(struct ieee80211_hw *hw);
 312
 313 int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length);
 314 void zd_mac_tx_failed(struct urb *urb);
 315 void zd_mac_tx_to_dev(struct sk_buff *skb, int error);
 316
 317 int zd_op_start(struct ieee80211_hw *hw);
 318 void zd_op_stop(struct ieee80211_hw *hw);
 319 int zd_restore_settings(struct zd_mac *mac);
 320
 321 #ifdef DEBUG
 322 void zd_dump_rx_status(const struct rx_status *status);
 323 #else
 324 #define zd_dump_rx_status(status)
 325 #endif /* DEBUG */
 326
 327 #endif /* _ZD_MAC_H */