drivers/net/wireless/rt2x00/rt2x00.h

   1 /*
   2         Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00
  23         Abstract: rt2x00 global information.
  24  */
  25
  26 #ifndef RT2X00_H
  27 #define RT2X00_H
  28
  29 #include <linux/bitops.h>
  30 #include <linux/prefetch.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/workqueue.h>
  33 #include <linux/firmware.h>
  34 #include <linux/mutex.h>
  35 #include <linux/etherdevice.h>
  36
  37 #include <net/mac80211.h>
  38
  39 #include "rt2x00debug.h"
  40 #include "rt2x00reg.h"
  41 #include "rt2x00ring.h"
  42
  43 /*
  44  * Module information.
  45  */
  46 #define DRV_VERSION     "2.0.14"
  47 #define DRV_PROJECT     "http://rt2x00.serialmonkey.com"
  48
  49 /*
  50  * Debug definitions.
  51  * Debug output has to be enabled during compile time.
  52  */
  53 #define DEBUG_PRINTK_MSG(__dev, __kernlvl, __lvl, __msg, __args...)     \
  54         printk(__kernlvl "%s -> %s: %s - " __msg,                       \
  55                wiphy_name((__dev)->hw->wiphy), __FUNCTION__, __lvl, ##__args)
  56
  57 #define DEBUG_PRINTK_PROBE(__kernlvl, __lvl, __msg, __args...)  \
  58         printk(__kernlvl "%s -> %s: %s - " __msg,               \
  59                KBUILD_MODNAME, __FUNCTION__, __lvl, ##__args)
  60
  61 #ifdef CONFIG_RT2X00_DEBUG
  62 #define DEBUG_PRINTK(__dev, __kernlvl, __lvl, __msg, __args...) \
  63         DEBUG_PRINTK_MSG(__dev, __kernlvl, __lvl, __msg, ##__args);
  64 #else
  65 #define DEBUG_PRINTK(__dev, __kernlvl, __lvl, __msg, __args...) \
  66         do { } while (0)
  67 #endif /* CONFIG_RT2X00_DEBUG */
  68
  69 /*
  70  * Various debug levels.
  71  * The debug levels PANIC and ERROR both indicate serious problems,
  72  * for this reason they should never be ignored.
  73  * The special ERROR_PROBE message is for messages that are generated
  74  * when the rt2x00_dev is not yet initialized.
  75  */
  76 #define PANIC(__dev, __msg, __args...) \
  77         DEBUG_PRINTK_MSG(__dev, KERN_CRIT, "Panic", __msg, ##__args)
  78 #define ERROR(__dev, __msg, __args...)  \
  79         DEBUG_PRINTK_MSG(__dev, KERN_ERR, "Error", __msg, ##__args)
  80 #define ERROR_PROBE(__msg, __args...) \
  81         DEBUG_PRINTK_PROBE(KERN_ERR, "Error", __msg, ##__args)
  82 #define WARNING(__dev, __msg, __args...) \
  83         DEBUG_PRINTK(__dev, KERN_WARNING, "Warning", __msg, ##__args)
  84 #define NOTICE(__dev, __msg, __args...) \
  85         DEBUG_PRINTK(__dev, KERN_NOTICE, "Notice", __msg, ##__args)
  86 #define INFO(__dev, __msg, __args...) \
  87         DEBUG_PRINTK(__dev, KERN_INFO, "Info", __msg, ##__args)
  88 #define DEBUG(__dev, __msg, __args...) \
  89         DEBUG_PRINTK(__dev, KERN_DEBUG, "Debug", __msg, ##__args)
  90 #define EEPROM(__dev, __msg, __args...) \
  91         DEBUG_PRINTK(__dev, KERN_DEBUG, "EEPROM recovery", __msg, ##__args)
  92
  93 /*
  94  * Ring sizes.
  95  * Ralink PCI devices demand the Frame size to be a multiple of 128 bytes.
  96  * DATA_FRAME_SIZE is used for TX, RX, ATIM and PRIO rings.
  97  * MGMT_FRAME_SIZE is used for the BEACON ring.
  98  */
  99 #define DATA_FRAME_SIZE 2432
 100 #define MGMT_FRAME_SIZE 256
 101
 102 /*
 103  * Number of entries in a packet ring.
 104  * PCI devices only need 1 Beacon entry,
 105  * but USB devices require a second because they
 106  * have to send a Guardian byte first.
 107  */
 108 #define RX_ENTRIES      12
 109 #define TX_ENTRIES      12
 110 #define ATIM_ENTRIES    1
 111 #define BEACON_ENTRIES  2
 112
 113 /*
 114  * Standard timing and size defines.
 115  * These values should follow the ieee80211 specifications.
 116  */
 117 #define ACK_SIZE                14
 118 #define IEEE80211_HEADER        24
 119 #define PLCP                    48
 120 #define BEACON                  100
 121 #define PREAMBLE                144
 122 #define SHORT_PREAMBLE          72
 123 #define SLOT_TIME               20
 124 #define SHORT_SLOT_TIME         9
 125 #define SIFS                    10
 126 #define PIFS                    ( SIFS + SLOT_TIME )
 127 #define SHORT_PIFS              ( SIFS + SHORT_SLOT_TIME )
 128 #define DIFS                    ( PIFS + SLOT_TIME )
 129 #define SHORT_DIFS              ( SHORT_PIFS + SHORT_SLOT_TIME )
 130 #define EIFS                    ( SIFS + (8 * (IEEE80211_HEADER + ACK_SIZE)) )
 131
 132 /*
 133  * IEEE802.11 header defines
 134  */
 135 static inline int is_rts_frame(u16 fc)
 136 {
 137         return (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) &&
 138                 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_RTS));
 139 }
 140
 141 static inline int is_cts_frame(u16 fc)
 142 {
 143         return (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) &&
 144                 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_CTS));
 145 }
 146
 147 static inline int is_probe_resp(u16 fc)
 148 {
 149         return (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
 150                 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP));
 151 }
 152
 153 static inline int is_beacon(u16 fc)
 154 {
 155         return (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
 156                 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON));
 157 }
 158
 159 /*
 160  * Chipset identification
 161  * The chipset on the device is composed of a RT and RF chip.
 162  * The chipset combination is important for determining device capabilities.
 163  */
 164 struct rt2x00_chip {
 165         u16 rt;
 166 #define RT2460          0x0101
 167 #define RT2560          0x0201
 168 #define RT2570          0x1201
 169 #define RT2561s         0x0301  /* Turbo */
 170 #define RT2561          0x0302
 171 #define RT2661          0x0401
 172 #define RT2571          0x1300
 173
 174         u16 rf;
 175         u32 rev;
 176 };
 177
 178 /*
 179  * RF register values that belong to a particular channel.
 180  */
 181 struct rf_channel {
 182         int channel;
 183         u32 rf1;
 184         u32 rf2;
 185         u32 rf3;
 186         u32 rf4;
 187 };
 188
 189 /*
 190  * Antenna setup values.
 191  */
 192 struct antenna_setup {
 193         enum antenna rx;
 194         enum antenna tx;
 195 };
 196
 197 /*
 198  * Quality statistics about the currently active link.
 199  */
 200 struct link_qual {
 201         /*
 202          * Statistics required for Link tuning.
 203          * For the average RSSI value we use the "Walking average" approach.
 204          * When adding RSSI to the average value the following calculation
 205          * is needed:
 206          *
 207          *        avg_rssi = ((avg_rssi * 7) + rssi) / 8;
 208          *
 209          * The advantage of this approach is that we only need 1 variable
 210          * to store the average in (No need for a count and a total).
 211          * But more importantly, normal average values will over time
 212          * move less and less towards newly added values this results
 213          * that with link tuning, the device can have a very good RSSI
 214          * for a few minutes but when the device is moved away from the AP
 215          * the average will not decrease fast enough to compensate.
 216          * The walking average compensates this and will move towards
 217          * the new values correctly allowing a effective link tuning.
 218          */
 219         int avg_rssi;
 220         int false_cca;
 221
 222         /*
 223          * Statistics required for Signal quality calculation.
 224          * For calculating the Signal quality we have to determine
 225          * the total number of success and failed RX and TX frames.
 226          * After that we also use the average RSSI value to help
 227          * determining the signal quality.
 228          * For the calculation we will use the following algorithm:
 229          *
 230          *         rssi_percentage = (avg_rssi * 100) / rssi_offset
 231          *         rx_percentage = (rx_success * 100) / rx_total
 232          *         tx_percentage = (tx_success * 100) / tx_total
 233          *         avg_signal = ((WEIGHT_RSSI * avg_rssi) +
 234          *                       (WEIGHT_TX * tx_percentage) +
 235          *                       (WEIGHT_RX * rx_percentage)) / 100
 236          *
 237          * This value should then be checked to not be greated then 100.
 238          */
 239         int rx_percentage;
 240         int rx_success;
 241         int rx_failed;
 242         int tx_percentage;
 243         int tx_success;
 244         int tx_failed;
 245 #define WEIGHT_RSSI     20
 246 #define WEIGHT_RX       40
 247 #define WEIGHT_TX       40
 248 };
 249
 250 /*
 251  * Antenna settings about the currently active link.
 252  */
 253 struct link_ant {
 254         /*
 255          * Antenna flags
 256          */
 257         unsigned int flags;
 258 #define ANTENNA_RX_DIVERSITY    0x00000001
 259 #define ANTENNA_TX_DIVERSITY    0x00000002
 260 #define ANTENNA_MODE_SAMPLE     0x00000004
 261
 262         /*
 263          * Currently active TX/RX antenna setup.
 264          * When software diversity is used, this will indicate
 265          * which antenna is actually used at this time.
 266          */
 267         struct antenna_setup active;
 268
 269         /*
 270          * RSSI information for the different antenna's.
 271          * These statistics are used to determine when
 272          * to switch antenna when using software diversity.
 273          *
 274          *        rssi[0] -> Antenna A RSSI
 275          *        rssi[1] -> Antenna B RSSI
 276          */
 277         int rssi_history[2];
 278
 279         /*
 280          * Current RSSI average of the currently active antenna.
 281          * Similar to the avg_rssi in the link_qual structure
 282          * this value is updated by using the walking average.
 283          */
 284         int rssi_ant;
 285 };
 286
 287 /*
 288  * To optimize the quality of the link we need to store
 289  * the quality of received frames and periodically
 290  * optimize the link.
 291  */
 292 struct link {
 293         /*
 294          * Link tuner counter
 295          * The number of times the link has been tuned
 296          * since the radio has been switched on.
 297          */
 298         u32 count;
 299
 300         /*
 301          * Quality measurement values.
 302          */
 303         struct link_qual qual;
 304
 305         /*
 306          * TX/RX antenna setup.
 307          */
 308         struct link_ant ant;
 309
 310         /*
 311          * Active VGC level
 312          */
 313         int vgc_level;
 314
 315         /*
 316          * Work structure for scheduling periodic link tuning.
 317          */
 318         struct delayed_work work;
 319 };
 320
 321 /*
 322  * Small helper macro to work with moving/walking averages.
 323  */
 324 #define MOVING_AVERAGE(__avg, __val, __samples) \
 325         ( (((__avg) * ((__samples) - 1)) + (__val)) / (__samples) )
 326
 327 /*
 328  * When we lack RSSI information return something less then -80 to
 329  * tell the driver to tune the device to maximum sensitivity.
 330  */
 331 #define DEFAULT_RSSI    ( -128 )
 332
 333 /*
 334  * Link quality access functions.
 335  */
 336 static inline int rt2x00_get_link_rssi(struct link *link)
 337 {
 338         if (link->qual.avg_rssi && link->qual.rx_success)
 339                 return link->qual.avg_rssi;
 340         return DEFAULT_RSSI;
 341 }
 342
 343 static inline int rt2x00_get_link_ant_rssi(struct link *link)
 344 {
 345         if (link->ant.rssi_ant && link->qual.rx_success)
 346                 return link->ant.rssi_ant;
 347         return DEFAULT_RSSI;
 348 }
 349
 350 static inline int rt2x00_get_link_ant_rssi_history(struct link *link,
 351                                                    enum antenna ant)
 352 {
 353         if (link->ant.rssi_history[ant - ANTENNA_A])
 354                 return link->ant.rssi_history[ant - ANTENNA_A];
 355         return DEFAULT_RSSI;
 356 }
 357
 358 static inline int rt2x00_update_ant_rssi(struct link *link, int rssi)
 359 {
 360         int old_rssi = link->ant.rssi_history[link->ant.active.rx - ANTENNA_A];
 361         link->ant.rssi_history[link->ant.active.rx - ANTENNA_A] = rssi;
 362         return old_rssi;
 363 }
 364
 365 /*
 366  * Interface structure
 367  * Configuration details about the current interface.
 368  */
 369 struct interface {
 370         /*
 371          * Interface identification. The value is assigned
 372          * to us by the 80211 stack, and is used to request
 373          * new beacons.
 374          */
 375         struct ieee80211_vif *id;
 376
 377         /*
 378          * Current working type (IEEE80211_IF_TYPE_*).
 379          */
 380         int type;
 381
 382         /*
 383          * MAC of the device.
 384          */
 385         u8 mac[ETH_ALEN];
 386
 387         /*
 388          * BBSID of the AP to associate with.
 389          */
 390         u8 bssid[ETH_ALEN];
 391 };
 392
 393 static inline int is_interface_present(struct interface *intf)
 394 {
 395         return !!intf->id;
 396 }
 397
 398 static inline int is_interface_type(struct interface *intf, int type)
 399 {
 400         return intf->type == type;
 401 }
 402
 403 /*
 404  * Details about the supported modes, rates and channels
 405  * of a particular chipset. This is used by rt2x00lib
 406  * to build the ieee80211_hw_mode array for mac80211.
 407  */
 408 struct hw_mode_spec {
 409         /*
 410          * Number of modes, rates and channels.
 411          */
 412         int num_modes;
 413         int num_rates;
 414         int num_channels;
 415
 416         /*
 417          * txpower values.
 418          */
 419         const u8 *tx_power_a;
 420         const u8 *tx_power_bg;
 421         u8 tx_power_default;
 422
 423         /*
 424          * Device/chipset specific value.
 425          */
 426         const struct rf_channel *channels;
 427 };
 428
 429 /*
 430  * Configuration structure wrapper around the
 431  * mac80211 configuration structure.
 432  * When mac80211 configures the driver, rt2x00lib
 433  * can precalculate values which are equal for all
 434  * rt2x00 drivers. Those values can be stored in here.
 435  */
 436 struct rt2x00lib_conf {
 437         struct ieee80211_conf *conf;
 438         struct rf_channel rf;
 439
 440         struct antenna_setup ant;
 441
 442         int phymode;
 443
 444         int basic_rates;
 445         int slot_time;
 446
 447         short sifs;
 448         short pifs;
 449         short difs;
 450         short eifs;
 451 };
 452
 453 /*
 454  * rt2x00lib callback functions.
 455  */
 456 struct rt2x00lib_ops {
 457         /*
 458          * Interrupt handlers.
 459          */
 460         irq_handler_t irq_handler;
 461
 462         /*
 463          * Device init handlers.
 464          */
 465         int (*probe_hw) (struct rt2x00_dev *rt2x00dev);
 466         char *(*get_firmware_name) (struct rt2x00_dev *rt2x00dev);
 467         int (*load_firmware) (struct rt2x00_dev *rt2x00dev, void *data,
 468                               const size_t len);
 469
 470         /*
 471          * Device initialization/deinitialization handlers.
 472          */
 473         int (*initialize) (struct rt2x00_dev *rt2x00dev);
 474         void (*uninitialize) (struct rt2x00_dev *rt2x00dev);
 475
 476         /*
 477          * Ring initialization handlers
 478          */
 479         void (*init_rxentry) (struct rt2x00_dev *rt2x00dev,
 480                               struct data_entry *entry);
 481         void (*init_txentry) (struct rt2x00_dev *rt2x00dev,
 482                               struct data_entry *entry);
 483
 484         /*
 485          * Radio control handlers.
 486          */
 487         int (*set_device_state) (struct rt2x00_dev *rt2x00dev,
 488                                  enum dev_state state);
 489         int (*rfkill_poll) (struct rt2x00_dev *rt2x00dev);
 490         void (*link_stats) (struct rt2x00_dev *rt2x00dev,
 491                             struct link_qual *qual);
 492         void (*reset_tuner) (struct rt2x00_dev *rt2x00dev);
 493         void (*link_tuner) (struct rt2x00_dev *rt2x00dev);
 494
 495         /*
 496          * TX control handlers
 497          */
 498         void (*write_tx_desc) (struct rt2x00_dev *rt2x00dev,
 499                                struct sk_buff *skb,
 500                                struct txdata_entry_desc *desc,
 501                                struct ieee80211_tx_control *control);
 502         int (*write_tx_data) (struct rt2x00_dev *rt2x00dev,
 503                               struct data_ring *ring, struct sk_buff *skb,
 504                               struct ieee80211_tx_control *control);
 505         int (*get_tx_data_len) (struct rt2x00_dev *rt2x00dev,
 506                                 struct sk_buff *skb);
 507         void (*kick_tx_queue) (struct rt2x00_dev *rt2x00dev,
 508                                unsigned int queue);
 509
 510         /*
 511          * RX control handlers
 512          */
 513         void (*fill_rxdone) (struct data_entry *entry,
 514                              struct rxdata_entry_desc *desc);
 515
 516         /*
 517          * Configuration handlers.
 518          */
 519         void (*config_mac_addr) (struct rt2x00_dev *rt2x00dev, __le32 *mac);
 520         void (*config_bssid) (struct rt2x00_dev *rt2x00dev, __le32 *bssid);
 521         void (*config_type) (struct rt2x00_dev *rt2x00dev, const int type,
 522                                                            const int tsf_sync);
 523         void (*config_preamble) (struct rt2x00_dev *rt2x00dev,
 524                                  const int short_preamble,
 525                                  const int ack_timeout,
 526                                  const int ack_consume_time);
 527         void (*config) (struct rt2x00_dev *rt2x00dev, const unsigned int flags,
 528                         struct rt2x00lib_conf *libconf);
 529 #define CONFIG_UPDATE_PHYMODE           ( 1 << 1 )
 530 #define CONFIG_UPDATE_CHANNEL           ( 1 << 2 )
 531 #define CONFIG_UPDATE_TXPOWER           ( 1 << 3 )
 532 #define CONFIG_UPDATE_ANTENNA           ( 1 << 4 )
 533 #define CONFIG_UPDATE_SLOT_TIME         ( 1 << 5 )
 534 #define CONFIG_UPDATE_BEACON_INT        ( 1 << 6 )
 535 #define CONFIG_UPDATE_ALL               0xffff
 536 };
 537
 538 /*
 539  * rt2x00 driver callback operation structure.
 540  */
 541 struct rt2x00_ops {
 542         const char *name;
 543         const unsigned int rxd_size;
 544         const unsigned int txd_size;
 545         const unsigned int eeprom_size;
 546         const unsigned int rf_size;
 547         const struct rt2x00lib_ops *lib;
 548         const struct ieee80211_ops *hw;
 549 #ifdef CONFIG_RT2X00_LIB_DEBUGFS
 550         const struct rt2x00debug *debugfs;
 551 #endif /* CONFIG_RT2X00_LIB_DEBUGFS */
 552 };
 553
 554 /*
 555  * rt2x00 device flags
 556  */
 557 enum rt2x00_flags {
 558         /*
 559          * Device state flags
 560          */
 561         DEVICE_PRESENT,
 562         DEVICE_REGISTERED_HW,
 563         DEVICE_INITIALIZED,
 564         DEVICE_STARTED,
 565         DEVICE_STARTED_SUSPEND,
 566         DEVICE_ENABLED_RADIO,
 567         DEVICE_DISABLED_RADIO_HW,
 568
 569         /*
 570          * Driver features
 571          */
 572         DRIVER_REQUIRE_FIRMWARE,
 573         DRIVER_REQUIRE_BEACON_RING,
 574
 575         /*
 576          * Driver configuration
 577          */
 578         CONFIG_SUPPORT_HW_BUTTON,
 579         CONFIG_FRAME_TYPE,
 580         CONFIG_RF_SEQUENCE,
 581         CONFIG_EXTERNAL_LNA_A,
 582         CONFIG_EXTERNAL_LNA_BG,
 583         CONFIG_DOUBLE_ANTENNA,
 584         CONFIG_DISABLE_LINK_TUNING,
 585         CONFIG_SHORT_PREAMBLE,
 586 };
 587
 588 /*
 589  * rt2x00 device structure.
 590  */
 591 struct rt2x00_dev {
 592         /*
 593          * Device structure.
 594          * The structure stored in here depends on the
 595          * system bus (PCI or USB).
 596          * When accessing this variable, the rt2x00dev_{pci,usb}
 597          * macro's should be used for correct typecasting.
 598          */
 599         void *dev;
 600 #define rt2x00dev_pci(__dev)    ( (struct pci_dev*)(__dev)->dev )
 601 #define rt2x00dev_usb(__dev)    ( (struct usb_interface*)(__dev)->dev )
 602
 603         /*
 604          * Callback functions.
 605          */
 606         const struct rt2x00_ops *ops;
 607
 608         /*
 609          * IEEE80211 control structure.
 610          */
 611         struct ieee80211_hw *hw;
 612         struct ieee80211_hw_mode *hwmodes;
 613         unsigned int curr_hwmode;
 614 #define HWMODE_B        0
 615 #define HWMODE_G        1
 616 #define HWMODE_A        2
 617
 618         /*
 619          * rfkill structure for RF state switching support.
 620          * This will only be compiled in when required.
 621          */
 622 #ifdef CONFIG_RT2X00_LIB_RFKILL
 623         struct rfkill *rfkill;
 624         struct input_polled_dev *poll_dev;
 625 #endif /* CONFIG_RT2X00_LIB_RFKILL */
 626
 627         /*
 628          * If enabled, the debugfs interface structures
 629          * required for deregistration of debugfs.
 630          */
 631 #ifdef CONFIG_RT2X00_LIB_DEBUGFS
 632         struct rt2x00debug_intf *debugfs_intf;
 633 #endif /* CONFIG_RT2X00_LIB_DEBUGFS */
 634
 635         /*
 636          * Device flags.
 637          * In these flags the current status and some
 638          * of the device capabilities are stored.
 639          */
 640         unsigned long flags;
 641
 642         /*
 643          * Chipset identification.
 644          */
 645         struct rt2x00_chip chip;
 646
 647         /*
 648          * hw capability specifications.
 649          */
 650         struct hw_mode_spec spec;
 651
 652         /*
 653          * This is the default TX/RX antenna setup as indicated
 654          * by the device's EEPROM. When mac80211 sets its
 655          * antenna value to 0 we should be using these values.
 656          */
 657         struct antenna_setup default_ant;
 658
 659         /*
 660          * Register pointers
 661          * csr_addr: Base register address. (PCI)
 662          * csr_cache: CSR cache for usb_control_msg. (USB)
 663          */
 664         void __iomem *csr_addr;
 665         void *csr_cache;
 666
 667         /*
 668          * Mutex to protect register accesses on USB devices.
 669          * There are 2 reasons this is needed, one is to ensure
 670          * use of the csr_cache (for USB devices) by one thread
 671          * isn't corrupted by another thread trying to access it.
 672          * The other is that access to BBP and RF registers
 673          * require multiple BUS transactions and if another thread
 674          * attempted to access one of those registers at the same
 675          * time one of the writes could silently fail.
 676          */
 677         struct mutex usb_cache_mutex;
 678
 679         /*
 680          * Current packet filter configuration for the device.
 681          * This contains all currently active FIF_* flags send
 682          * to us by mac80211 during configure_filter().
 683          */
 684         unsigned int packet_filter;
 685
 686         /*
 687          * Interface configuration.
 688          */
 689         struct interface interface;
 690
 691         /*
 692          * Link quality
 693          */
 694         struct link link;
 695
 696         /*
 697          * EEPROM data.
 698          */
 699         __le16 *eeprom;
 700
 701         /*
 702          * Active RF register values.
 703          * These are stored here so we don't need
 704          * to read the rf registers and can directly
 705          * use this value instead.
 706          * This field should be accessed by using
 707          * rt2x00_rf_read() and rt2x00_rf_write().
 708          */
 709         u32 *rf;
 710
 711         /*
 712          * USB Max frame size (for rt2500usb & rt73usb).
 713          */
 714         u16 usb_maxpacket;
 715
 716         /*
 717          * Current TX power value.
 718          */
 719         u16 tx_power;
 720
 721         /*
 722          * LED register (for rt61pci & rt73usb).
 723          */
 724         u16 led_reg;
 725
 726         /*
 727          * Led mode (LED_MODE_*)
 728          */
 729         u8 led_mode;
 730
 731         /*
 732          * Rssi <-> Dbm offset
 733          */
 734         u8 rssi_offset;
 735
 736         /*
 737          * Frequency offset (for rt61pci & rt73usb).
 738          */
 739         u8 freq_offset;
 740
 741         /*
 742          * Low level statistics which will have
 743          * to be kept up to date while device is running.
 744          */
 745         struct ieee80211_low_level_stats low_level_stats;
 746
 747         /*
 748          * RX configuration information.
 749          */
 750         struct ieee80211_rx_status rx_status;
 751
 752         /*
 753          * Scheduled work.
 754          */
 755         struct work_struct beacon_work;
 756         struct work_struct filter_work;
 757         struct work_struct config_work;
 758
 759         /*
 760          * Data ring arrays for RX, TX and Beacon.
 761          * The Beacon array also contains the Atim ring
 762          * if that is supported by the device.
 763          */
 764         int data_rings;
 765         struct data_ring *rx;
 766         struct data_ring *tx;
 767         struct data_ring *bcn;
 768
 769         /*
 770          * Firmware image.
 771          */
 772         const struct firmware *fw;
 773 };
 774
 775 /*
 776  * For-each loop for the ring array.
 777  * All rings have been allocated as a single array,
 778  * this means we can create a very simply loop macro
 779  * that is capable of looping through all rings.
 780  * ring_end(), txring_end() and ring_loop() are helper macro's which
 781  * should not be used directly. Instead the following should be used:
 782  * ring_for_each() - Loops through all rings (RX, TX, Beacon & Atim)
 783  * txring_for_each() - Loops through TX data rings (TX only)
 784  * txringall_for_each() - Loops through all TX rings (TX, Beacon & Atim)
 785  */
 786 #define ring_end(__dev) \
 787         &(__dev)->rx[(__dev)->data_rings]
 788
 789 #define txring_end(__dev) \
 790         &(__dev)->tx[(__dev)->hw->queues]
 791
 792 #define ring_loop(__entry, __start, __end)                      \
 793         for ((__entry) = (__start);                             \
 794              prefetch(&(__entry)[1]), (__entry) != (__end);     \
 795              (__entry) = &(__entry)[1])
 796
 797 #define ring_for_each(__dev, __entry) \
 798         ring_loop(__entry, (__dev)->rx, ring_end(__dev))
 799
 800 #define txring_for_each(__dev, __entry) \
 801         ring_loop(__entry, (__dev)->tx, txring_end(__dev))
 802
 803 #define txringall_for_each(__dev, __entry) \
 804         ring_loop(__entry, (__dev)->tx, ring_end(__dev))
 805
 806 /*
 807  * Generic RF access.
 808  * The RF is being accessed by word index.
 809  */
 810 static inline void rt2x00_rf_read(struct rt2x00_dev *rt2x00dev,
 811                                   const unsigned int word, u32 *data)
 812 {
 813         *data = rt2x00dev->rf[word];
 814 }
 815
 816 static inline void rt2x00_rf_write(struct rt2x00_dev *rt2x00dev,
 817                                    const unsigned int word, u32 data)
 818 {
 819         rt2x00dev->rf[word] = data;
 820 }
 821
 822 /*
 823  *  Generic EEPROM access.
 824  * The EEPROM is being accessed by word index.
 825  */
 826 static inline void *rt2x00_eeprom_addr(struct rt2x00_dev *rt2x00dev,
 827                                        const unsigned int word)
 828 {
 829         return (void *)&rt2x00dev->eeprom[word];
 830 }
 831
 832 static inline void rt2x00_eeprom_read(struct rt2x00_dev *rt2x00dev,
 833                                       const unsigned int word, u16 *data)
 834 {
 835         *data = le16_to_cpu(rt2x00dev->eeprom[word]);
 836 }
 837
 838 static inline void rt2x00_eeprom_write(struct rt2x00_dev *rt2x00dev,
 839                                        const unsigned int word, u16 data)
 840 {
 841         rt2x00dev->eeprom[word] = cpu_to_le16(data);
 842 }
 843
 844 /*
 845  * Chipset handlers
 846  */
 847 static inline void rt2x00_set_chip(struct rt2x00_dev *rt2x00dev,
 848                                    const u16 rt, const u16 rf, const u32 rev)
 849 {
 850         INFO(rt2x00dev,
 851              "Chipset detected - rt: %04x, rf: %04x, rev: %08x.\n",
 852              rt, rf, rev);
 853
 854         rt2x00dev->chip.rt = rt;
 855         rt2x00dev->chip.rf = rf;
 856         rt2x00dev->chip.rev = rev;
 857 }
 858
 859 static inline char rt2x00_rt(const struct rt2x00_chip *chipset, const u16 chip)
 860 {
 861         return (chipset->rt == chip);
 862 }
 863
 864 static inline char rt2x00_rf(const struct rt2x00_chip *chipset, const u16 chip)
 865 {
 866         return (chipset->rf == chip);
 867 }
 868
 869 static inline u16 rt2x00_rev(const struct rt2x00_chip *chipset)
 870 {
 871         return chipset->rev;
 872 }
 873
 874 static inline u16 rt2x00_check_rev(const struct rt2x00_chip *chipset,
 875                                    const u32 rev)
 876 {
 877         return (((chipset->rev & 0xffff0) == rev) &&
 878                 !!(chipset->rev & 0x0000f));
 879 }
 880
 881 /*
 882  * Duration calculations
 883  * The rate variable passed is: 100kbs.
 884  * To convert from bytes to bits we multiply size with 8,
 885  * then the size is multiplied with 10 to make the
 886  * real rate -> rate argument correction.
 887  */
 888 static inline u16 get_duration(const unsigned int size, const u8 rate)
 889 {
 890         return ((size * 8 * 10) / rate);
 891 }
 892
 893 static inline u16 get_duration_res(const unsigned int size, const u8 rate)
 894 {
 895         return ((size * 8 * 10) % rate);
 896 }
 897
 898 /*
 899  * Library functions.
 900  */
 901 struct data_ring *rt2x00lib_get_ring(struct rt2x00_dev *rt2x00dev,
 902                                      const unsigned int queue);
 903
 904 /*
 905  * Interrupt context handlers.
 906  */
 907 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev);
 908 void rt2x00lib_txdone(struct data_entry *entry,
 909                       const int status, const int retry);
 910 void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
 911                       struct rxdata_entry_desc *desc);
 912
 913 /*
 914  * TX descriptor initializer
 915  */
 916 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 917                              struct sk_buff *skb,
 918                              struct ieee80211_tx_control *control);
 919
 920 /*
 921  * mac80211 handlers.
 922  */
 923 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
 924                  struct ieee80211_tx_control *control);
 925 int rt2x00mac_start(struct ieee80211_hw *hw);
 926 void rt2x00mac_stop(struct ieee80211_hw *hw);
 927 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 928                             struct ieee80211_if_init_conf *conf);
 929 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 930                                 struct ieee80211_if_init_conf *conf);
 931 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf);
 932 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
 933                                struct ieee80211_vif *vif,
 934                                struct ieee80211_if_conf *conf);
 935 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
 936                         struct ieee80211_low_level_stats *stats);
 937 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
 938                            struct ieee80211_tx_queue_stats *stats);
 939 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
 940                                 struct ieee80211_vif *vif,
 941                                 struct ieee80211_bss_conf *bss_conf,
 942                                 u32 changes);
 943 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue,
 944                       const struct ieee80211_tx_queue_params *params);
 945
 946 /*
 947  * Driver allocation handlers.
 948  */
 949 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev);
 950 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev);
 951 #ifdef CONFIG_PM
 952 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state);
 953 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev);
 954 #endif /* CONFIG_PM */
 955
 956 #endif /* RT2X00_H */