2 Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
3 <http://rt2x00.serialmonkey.com>
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.
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.
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.
23 Abstract: rt2x00 generic device routines.
26 #include <linux/kernel.h>
27 #include <linux/module.h>
30 #include "rt2x00lib.h"
31 #include "rt2x00dump.h"
36 struct data_ring
*rt2x00lib_get_ring(struct rt2x00_dev
*rt2x00dev
,
37 const unsigned int queue
)
39 int beacon
= test_bit(DRIVER_REQUIRE_BEACON_RING
, &rt2x00dev
->flags
);
42 * Check if we are requesting a reqular TX ring,
43 * or if we are requesting a Beacon or Atim ring.
44 * For Atim rings, we should check if it is supported.
46 if (queue
< rt2x00dev
->hw
->queues
&& rt2x00dev
->tx
)
47 return &rt2x00dev
->tx
[queue
];
49 if (!rt2x00dev
->bcn
|| !beacon
)
52 if (queue
== IEEE80211_TX_QUEUE_BEACON
)
53 return &rt2x00dev
->bcn
[0];
54 else if (queue
== IEEE80211_TX_QUEUE_AFTER_BEACON
)
55 return &rt2x00dev
->bcn
[1];
59 EXPORT_SYMBOL_GPL(rt2x00lib_get_ring
);
62 * Link tuning handlers
64 static void rt2x00lib_start_link_tuner(struct rt2x00_dev
*rt2x00dev
)
66 rt2x00dev
->link
.count
= 0;
67 rt2x00dev
->link
.vgc_level
= 0;
69 memset(&rt2x00dev
->link
.qual
, 0, sizeof(rt2x00dev
->link
.qual
));
72 * The RX and TX percentage should start at 50%
73 * this will assure we will get at least get some
74 * decent value when the link tuner starts.
75 * The value will be dropped and overwritten with
76 * the correct (measured )value anyway during the
77 * first run of the link tuner.
79 rt2x00dev
->link
.qual
.rx_percentage
= 50;
80 rt2x00dev
->link
.qual
.tx_percentage
= 50;
83 * Reset the link tuner.
85 rt2x00dev
->ops
->lib
->reset_tuner(rt2x00dev
);
87 queue_delayed_work(rt2x00dev
->hw
->workqueue
,
88 &rt2x00dev
->link
.work
, LINK_TUNE_INTERVAL
);
91 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev
*rt2x00dev
)
93 cancel_delayed_work_sync(&rt2x00dev
->link
.work
);
96 void rt2x00lib_reset_link_tuner(struct rt2x00_dev
*rt2x00dev
)
98 if (!test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
101 rt2x00lib_stop_link_tuner(rt2x00dev
);
102 rt2x00lib_start_link_tuner(rt2x00dev
);
106 * Ring initialization
108 static void rt2x00lib_init_rxrings(struct rt2x00_dev
*rt2x00dev
)
110 struct data_ring
*ring
= rt2x00dev
->rx
;
113 if (!rt2x00dev
->ops
->lib
->init_rxentry
)
117 memset(ring
->data_addr
, 0, rt2x00_get_ring_size(ring
));
119 for (i
= 0; i
< ring
->stats
.limit
; i
++)
120 rt2x00dev
->ops
->lib
->init_rxentry(rt2x00dev
, &ring
->entry
[i
]);
122 rt2x00_ring_index_clear(ring
);
125 static void rt2x00lib_init_txrings(struct rt2x00_dev
*rt2x00dev
)
127 struct data_ring
*ring
;
130 if (!rt2x00dev
->ops
->lib
->init_txentry
)
133 txringall_for_each(rt2x00dev
, ring
) {
135 memset(ring
->data_addr
, 0, rt2x00_get_ring_size(ring
));
137 for (i
= 0; i
< ring
->stats
.limit
; i
++)
138 rt2x00dev
->ops
->lib
->init_txentry(rt2x00dev
,
141 rt2x00_ring_index_clear(ring
);
146 * Radio control handlers.
148 int rt2x00lib_enable_radio(struct rt2x00_dev
*rt2x00dev
)
153 * Don't enable the radio twice.
154 * And check if the hardware button has been disabled.
156 if (test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
) ||
157 test_bit(DEVICE_DISABLED_RADIO_HW
, &rt2x00dev
->flags
))
161 * Initialize all data rings.
163 rt2x00lib_init_rxrings(rt2x00dev
);
164 rt2x00lib_init_txrings(rt2x00dev
);
169 status
= rt2x00dev
->ops
->lib
->set_device_state(rt2x00dev
,
174 __set_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
);
179 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_ON
);
182 * Start the TX queues.
184 ieee80211_start_queues(rt2x00dev
->hw
);
189 void rt2x00lib_disable_radio(struct rt2x00_dev
*rt2x00dev
)
191 if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
195 * Stop all scheduled work.
197 if (work_pending(&rt2x00dev
->beacon_work
))
198 cancel_work_sync(&rt2x00dev
->beacon_work
);
199 if (work_pending(&rt2x00dev
->filter_work
))
200 cancel_work_sync(&rt2x00dev
->filter_work
);
201 if (work_pending(&rt2x00dev
->config_work
))
202 cancel_work_sync(&rt2x00dev
->config_work
);
205 * Stop the TX queues.
207 ieee80211_stop_queues(rt2x00dev
->hw
);
212 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_OFF
);
217 rt2x00dev
->ops
->lib
->set_device_state(rt2x00dev
, STATE_RADIO_OFF
);
220 void rt2x00lib_toggle_rx(struct rt2x00_dev
*rt2x00dev
, enum dev_state state
)
223 * When we are disabling the RX, we should also stop the link tuner.
225 if (state
== STATE_RADIO_RX_OFF
)
226 rt2x00lib_stop_link_tuner(rt2x00dev
);
228 rt2x00dev
->ops
->lib
->set_device_state(rt2x00dev
, state
);
231 * When we are enabling the RX, we should also start the link tuner.
233 if (state
== STATE_RADIO_RX_ON
&&
234 is_interface_present(&rt2x00dev
->interface
))
235 rt2x00lib_start_link_tuner(rt2x00dev
);
238 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev
*rt2x00dev
)
240 enum antenna rx
= rt2x00dev
->link
.ant
.active
.rx
;
241 enum antenna tx
= rt2x00dev
->link
.ant
.active
.tx
;
243 rt2x00_get_link_ant_rssi_history(&rt2x00dev
->link
, ANTENNA_A
);
245 rt2x00_get_link_ant_rssi_history(&rt2x00dev
->link
, ANTENNA_B
);
248 * We are done sampling. Now we should evaluate the results.
250 rt2x00dev
->link
.ant
.flags
&= ~ANTENNA_MODE_SAMPLE
;
253 * During the last period we have sampled the RSSI
254 * from both antenna's. It now is time to determine
255 * which antenna demonstrated the best performance.
256 * When we are already on the antenna with the best
257 * performance, then there really is nothing for us
260 if (sample_a
== sample_b
)
263 if (rt2x00dev
->link
.ant
.flags
& ANTENNA_RX_DIVERSITY
) {
264 if (sample_a
> sample_b
&& rx
== ANTENNA_B
)
266 else if (rx
== ANTENNA_A
)
270 if (rt2x00dev
->link
.ant
.flags
& ANTENNA_TX_DIVERSITY
) {
271 if (sample_a
> sample_b
&& tx
== ANTENNA_B
)
273 else if (tx
== ANTENNA_A
)
277 rt2x00lib_config_antenna(rt2x00dev
, rx
, tx
);
280 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev
*rt2x00dev
)
282 enum antenna rx
= rt2x00dev
->link
.ant
.active
.rx
;
283 enum antenna tx
= rt2x00dev
->link
.ant
.active
.tx
;
284 int rssi_curr
= rt2x00_get_link_ant_rssi(&rt2x00dev
->link
);
285 int rssi_old
= rt2x00_update_ant_rssi(&rt2x00dev
->link
, rssi_curr
);
288 * Legacy driver indicates that we should swap antenna's
289 * when the difference in RSSI is greater that 5. This
290 * also should be done when the RSSI was actually better
291 * then the previous sample.
292 * When the difference exceeds the threshold we should
293 * sample the rssi from the other antenna to make a valid
294 * comparison between the 2 antennas.
296 if ((rssi_curr
- rssi_old
) > -5 || (rssi_curr
- rssi_old
) < 5)
299 rt2x00dev
->link
.ant
.flags
|= ANTENNA_MODE_SAMPLE
;
301 if (rt2x00dev
->link
.ant
.flags
& ANTENNA_RX_DIVERSITY
)
302 rx
= (rx
== ANTENNA_A
) ? ANTENNA_B
: ANTENNA_A
;
304 if (rt2x00dev
->link
.ant
.flags
& ANTENNA_TX_DIVERSITY
)
305 tx
= (tx
== ANTENNA_A
) ? ANTENNA_B
: ANTENNA_A
;
307 rt2x00lib_config_antenna(rt2x00dev
, rx
, tx
);
310 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev
*rt2x00dev
)
313 * Determine if software diversity is enabled for
314 * either the TX or RX antenna (or both).
315 * Always perform this check since within the link
316 * tuner interval the configuration might have changed.
318 rt2x00dev
->link
.ant
.flags
&= ~ANTENNA_RX_DIVERSITY
;
319 rt2x00dev
->link
.ant
.flags
&= ~ANTENNA_TX_DIVERSITY
;
321 if (rt2x00dev
->hw
->conf
.antenna_sel_rx
== 0 &&
322 rt2x00dev
->default_ant
.rx
!= ANTENNA_SW_DIVERSITY
)
323 rt2x00dev
->link
.ant
.flags
|= ANTENNA_RX_DIVERSITY
;
324 if (rt2x00dev
->hw
->conf
.antenna_sel_tx
== 0 &&
325 rt2x00dev
->default_ant
.tx
!= ANTENNA_SW_DIVERSITY
)
326 rt2x00dev
->link
.ant
.flags
|= ANTENNA_TX_DIVERSITY
;
328 if (!(rt2x00dev
->link
.ant
.flags
& ANTENNA_RX_DIVERSITY
) &&
329 !(rt2x00dev
->link
.ant
.flags
& ANTENNA_TX_DIVERSITY
)) {
330 rt2x00dev
->link
.ant
.flags
&= ~ANTENNA_MODE_SAMPLE
;
335 * If we have only sampled the data over the last period
336 * we should now harvest the data. Otherwise just evaluate
337 * the data. The latter should only be performed once
340 if (rt2x00dev
->link
.ant
.flags
& ANTENNA_MODE_SAMPLE
)
341 rt2x00lib_evaluate_antenna_sample(rt2x00dev
);
342 else if (rt2x00dev
->link
.count
& 1)
343 rt2x00lib_evaluate_antenna_eval(rt2x00dev
);
346 static void rt2x00lib_update_link_stats(struct link
*link
, int rssi
)
353 if (link
->qual
.avg_rssi
)
354 avg_rssi
= MOVING_AVERAGE(link
->qual
.avg_rssi
, rssi
, 8);
355 link
->qual
.avg_rssi
= avg_rssi
;
358 * Update antenna RSSI
360 if (link
->ant
.rssi_ant
)
361 rssi
= MOVING_AVERAGE(link
->ant
.rssi_ant
, rssi
, 8);
362 link
->ant
.rssi_ant
= rssi
;
365 static void rt2x00lib_precalculate_link_signal(struct link_qual
*qual
)
367 if (qual
->rx_failed
|| qual
->rx_success
)
368 qual
->rx_percentage
=
369 (qual
->rx_success
* 100) /
370 (qual
->rx_failed
+ qual
->rx_success
);
372 qual
->rx_percentage
= 50;
374 if (qual
->tx_failed
|| qual
->tx_success
)
375 qual
->tx_percentage
=
376 (qual
->tx_success
* 100) /
377 (qual
->tx_failed
+ qual
->tx_success
);
379 qual
->tx_percentage
= 50;
381 qual
->rx_success
= 0;
383 qual
->tx_success
= 0;
387 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev
*rt2x00dev
,
390 int rssi_percentage
= 0;
394 * We need a positive value for the RSSI.
397 rssi
+= rt2x00dev
->rssi_offset
;
400 * Calculate the different percentages,
401 * which will be used for the signal.
403 if (rt2x00dev
->rssi_offset
)
404 rssi_percentage
= (rssi
* 100) / rt2x00dev
->rssi_offset
;
407 * Add the individual percentages and use the WEIGHT
408 * defines to calculate the current link signal.
410 signal
= ((WEIGHT_RSSI
* rssi_percentage
) +
411 (WEIGHT_TX
* rt2x00dev
->link
.qual
.tx_percentage
) +
412 (WEIGHT_RX
* rt2x00dev
->link
.qual
.rx_percentage
)) / 100;
414 return (signal
> 100) ? 100 : signal
;
417 static void rt2x00lib_link_tuner(struct work_struct
*work
)
419 struct rt2x00_dev
*rt2x00dev
=
420 container_of(work
, struct rt2x00_dev
, link
.work
.work
);
423 * When the radio is shutting down we should
424 * immediately cease all link tuning.
426 if (!test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
432 rt2x00dev
->ops
->lib
->link_stats(rt2x00dev
, &rt2x00dev
->link
.qual
);
433 rt2x00dev
->low_level_stats
.dot11FCSErrorCount
+=
434 rt2x00dev
->link
.qual
.rx_failed
;
437 * Only perform the link tuning when Link tuning
438 * has been enabled (This could have been disabled from the EEPROM).
440 if (!test_bit(CONFIG_DISABLE_LINK_TUNING
, &rt2x00dev
->flags
))
441 rt2x00dev
->ops
->lib
->link_tuner(rt2x00dev
);
444 * Evaluate antenna setup.
446 rt2x00lib_evaluate_antenna(rt2x00dev
);
449 * Precalculate a portion of the link signal which is
450 * in based on the tx/rx success/failure counters.
452 rt2x00lib_precalculate_link_signal(&rt2x00dev
->link
.qual
);
455 * Increase tuner counter, and reschedule the next link tuner run.
457 rt2x00dev
->link
.count
++;
458 queue_delayed_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->link
.work
,
462 static void rt2x00lib_packetfilter_scheduled(struct work_struct
*work
)
464 struct rt2x00_dev
*rt2x00dev
=
465 container_of(work
, struct rt2x00_dev
, filter_work
);
466 unsigned int filter
= rt2x00dev
->packet_filter
;
469 * Since we had stored the filter inside interface.filter,
470 * we should now clear that field. Otherwise the driver will
471 * assume nothing has changed (*total_flags will be compared
472 * to interface.filter to determine if any action is required).
474 rt2x00dev
->packet_filter
= 0;
476 rt2x00dev
->ops
->hw
->configure_filter(rt2x00dev
->hw
,
477 filter
, &filter
, 0, NULL
);
480 static void rt2x00lib_configuration_scheduled(struct work_struct
*work
)
482 struct rt2x00_dev
*rt2x00dev
=
483 container_of(work
, struct rt2x00_dev
, config_work
);
484 struct ieee80211_bss_conf bss_conf
;
486 bss_conf
.use_short_preamble
=
487 test_bit(CONFIG_SHORT_PREAMBLE
, &rt2x00dev
->flags
);
490 * FIXME: shouldn't invoke it this way because all other contents
491 * of bss_conf is invalid.
493 rt2x00mac_bss_info_changed(rt2x00dev
->hw
, rt2x00dev
->interface
.id
,
494 &bss_conf
, BSS_CHANGED_ERP_PREAMBLE
);
498 * Interrupt context handlers.
500 static void rt2x00lib_beacondone_scheduled(struct work_struct
*work
)
502 struct rt2x00_dev
*rt2x00dev
=
503 container_of(work
, struct rt2x00_dev
, beacon_work
);
504 struct data_ring
*ring
=
505 rt2x00lib_get_ring(rt2x00dev
, IEEE80211_TX_QUEUE_BEACON
);
506 struct data_entry
*entry
= rt2x00_get_data_entry(ring
);
509 skb
= ieee80211_beacon_get(rt2x00dev
->hw
,
510 rt2x00dev
->interface
.id
,
511 &entry
->tx_status
.control
);
515 rt2x00dev
->ops
->hw
->beacon_update(rt2x00dev
->hw
, skb
,
516 &entry
->tx_status
.control
);
521 void rt2x00lib_beacondone(struct rt2x00_dev
*rt2x00dev
)
523 if (!test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
526 queue_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->beacon_work
);
528 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone
);
530 void rt2x00lib_txdone(struct data_entry
*entry
,
531 const int status
, const int retry
)
533 struct rt2x00_dev
*rt2x00dev
= entry
->ring
->rt2x00dev
;
534 struct ieee80211_tx_status
*tx_status
= &entry
->tx_status
;
535 struct ieee80211_low_level_stats
*stats
= &rt2x00dev
->low_level_stats
;
536 int success
= !!(status
== TX_SUCCESS
|| status
== TX_SUCCESS_RETRY
);
537 int fail
= !!(status
== TX_FAIL_RETRY
|| status
== TX_FAIL_INVALID
||
538 status
== TX_FAIL_OTHER
);
541 * Update TX statistics.
543 tx_status
->flags
= 0;
544 tx_status
->ack_signal
= 0;
545 tx_status
->excessive_retries
= (status
== TX_FAIL_RETRY
);
546 tx_status
->retry_count
= retry
;
547 rt2x00dev
->link
.qual
.tx_success
+= success
;
548 rt2x00dev
->link
.qual
.tx_failed
+= retry
+ fail
;
550 if (!(tx_status
->control
.flags
& IEEE80211_TXCTL_NO_ACK
)) {
552 tx_status
->flags
|= IEEE80211_TX_STATUS_ACK
;
554 stats
->dot11ACKFailureCount
++;
557 tx_status
->queue_length
= entry
->ring
->stats
.limit
;
558 tx_status
->queue_number
= tx_status
->control
.queue
;
560 if (tx_status
->control
.flags
& IEEE80211_TXCTL_USE_RTS_CTS
) {
562 stats
->dot11RTSSuccessCount
++;
564 stats
->dot11RTSFailureCount
++;
568 * Send the tx_status to mac80211 & debugfs.
569 * mac80211 will clean up the skb structure.
571 get_skb_desc(entry
->skb
)->frame_type
= DUMP_FRAME_TXDONE
;
572 rt2x00debug_dump_frame(rt2x00dev
, entry
->skb
);
573 ieee80211_tx_status_irqsafe(rt2x00dev
->hw
, entry
->skb
, tx_status
);
576 EXPORT_SYMBOL_GPL(rt2x00lib_txdone
);
578 void rt2x00lib_rxdone(struct data_entry
*entry
, struct sk_buff
*skb
,
579 struct rxdata_entry_desc
*desc
)
581 struct rt2x00_dev
*rt2x00dev
= entry
->ring
->rt2x00dev
;
582 struct ieee80211_rx_status
*rx_status
= &rt2x00dev
->rx_status
;
583 struct ieee80211_hw_mode
*mode
;
584 struct ieee80211_rate
*rate
;
585 struct ieee80211_hdr
*hdr
;
591 * Update RX statistics.
593 mode
= &rt2x00dev
->hwmodes
[rt2x00dev
->curr_hwmode
];
594 for (i
= 0; i
< mode
->num_rates
; i
++) {
595 rate
= &mode
->rates
[i
];
598 * When frame was received with an OFDM bitrate,
599 * the signal is the PLCP value. If it was received with
600 * a CCK bitrate the signal is the rate in 0.5kbit/s.
603 val
= DEVICE_GET_RATE_FIELD(rate
->val
, RATE
);
605 val
= DEVICE_GET_RATE_FIELD(rate
->val
, PLCP
);
607 if (val
== desc
->signal
) {
614 * Only update link status if this is a beacon frame carrying our bssid.
616 hdr
= (struct ieee80211_hdr
*)skb
->data
;
617 fc
= le16_to_cpu(hdr
->frame_control
);
618 if (is_beacon(fc
) && desc
->my_bss
)
619 rt2x00lib_update_link_stats(&rt2x00dev
->link
, desc
->rssi
);
621 rt2x00dev
->link
.qual
.rx_success
++;
623 rx_status
->rate
= val
;
625 rt2x00lib_calculate_link_signal(rt2x00dev
, desc
->rssi
);
626 rx_status
->ssi
= desc
->rssi
;
627 rx_status
->flag
= desc
->flags
;
628 rx_status
->antenna
= rt2x00dev
->link
.ant
.active
.rx
;
631 * Send frame to mac80211 & debugfs
633 get_skb_desc(skb
)->frame_type
= DUMP_FRAME_RXDONE
;
634 rt2x00debug_dump_frame(rt2x00dev
, skb
);
635 ieee80211_rx_irqsafe(rt2x00dev
->hw
, skb
, rx_status
);
637 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone
);
640 * TX descriptor initializer
642 void rt2x00lib_write_tx_desc(struct rt2x00_dev
*rt2x00dev
,
644 struct ieee80211_tx_control
*control
)
646 struct txdata_entry_desc desc
;
647 struct skb_desc
*skbdesc
= get_skb_desc(skb
);
648 struct ieee80211_hdr
*ieee80211hdr
= skbdesc
->data
;
657 memset(&desc
, 0, sizeof(desc
));
659 desc
.cw_min
= skbdesc
->ring
->tx_params
.cw_min
;
660 desc
.cw_max
= skbdesc
->ring
->tx_params
.cw_max
;
661 desc
.aifs
= skbdesc
->ring
->tx_params
.aifs
;
666 if (control
->queue
< rt2x00dev
->hw
->queues
)
667 desc
.queue
= control
->queue
;
668 else if (control
->queue
== IEEE80211_TX_QUEUE_BEACON
||
669 control
->queue
== IEEE80211_TX_QUEUE_AFTER_BEACON
)
670 desc
.queue
= QUEUE_MGMT
;
672 desc
.queue
= QUEUE_OTHER
;
675 * Read required fields from ieee80211 header.
677 frame_control
= le16_to_cpu(ieee80211hdr
->frame_control
);
678 seq_ctrl
= le16_to_cpu(ieee80211hdr
->seq_ctrl
);
680 tx_rate
= control
->tx_rate
;
683 * Check whether this frame is to be acked
685 if (!(control
->flags
& IEEE80211_TXCTL_NO_ACK
))
686 __set_bit(ENTRY_TXD_ACK
, &desc
.flags
);
689 * Check if this is a RTS/CTS frame
691 if (is_rts_frame(frame_control
) || is_cts_frame(frame_control
)) {
692 __set_bit(ENTRY_TXD_BURST
, &desc
.flags
);
693 if (is_rts_frame(frame_control
)) {
694 __set_bit(ENTRY_TXD_RTS_FRAME
, &desc
.flags
);
695 __set_bit(ENTRY_TXD_ACK
, &desc
.flags
);
697 __clear_bit(ENTRY_TXD_ACK
, &desc
.flags
);
698 if (control
->rts_cts_rate
)
699 tx_rate
= control
->rts_cts_rate
;
705 if (DEVICE_GET_RATE_FIELD(tx_rate
, RATEMASK
) & DEV_OFDM_RATEMASK
)
706 __set_bit(ENTRY_TXD_OFDM_RATE
, &desc
.flags
);
709 * Check if more fragments are pending
711 if (ieee80211_get_morefrag(ieee80211hdr
)) {
712 __set_bit(ENTRY_TXD_BURST
, &desc
.flags
);
713 __set_bit(ENTRY_TXD_MORE_FRAG
, &desc
.flags
);
717 * Beacons and probe responses require the tsf timestamp
718 * to be inserted into the frame.
720 if (control
->queue
== IEEE80211_TX_QUEUE_BEACON
||
721 is_probe_resp(frame_control
))
722 __set_bit(ENTRY_TXD_REQ_TIMESTAMP
, &desc
.flags
);
725 * Determine with what IFS priority this frame should be send.
726 * Set ifs to IFS_SIFS when the this is not the first fragment,
727 * or this fragment came after RTS/CTS.
729 if ((seq_ctrl
& IEEE80211_SCTL_FRAG
) > 0 ||
730 test_bit(ENTRY_TXD_RTS_FRAME
, &desc
.flags
))
733 desc
.ifs
= IFS_BACKOFF
;
737 * Length calculation depends on OFDM/CCK rate.
739 desc
.signal
= DEVICE_GET_RATE_FIELD(tx_rate
, PLCP
);
742 length
= skbdesc
->data_len
+ FCS_LEN
;
743 if (test_bit(ENTRY_TXD_OFDM_RATE
, &desc
.flags
)) {
744 desc
.length_high
= (length
>> 6) & 0x3f;
745 desc
.length_low
= length
& 0x3f;
747 bitrate
= DEVICE_GET_RATE_FIELD(tx_rate
, RATE
);
750 * Convert length to microseconds.
752 residual
= get_duration_res(length
, bitrate
);
753 duration
= get_duration(length
, bitrate
);
759 * Check if we need to set the Length Extension
761 if (bitrate
== 110 && residual
<= 30)
762 desc
.service
|= 0x80;
765 desc
.length_high
= (duration
>> 8) & 0xff;
766 desc
.length_low
= duration
& 0xff;
769 * When preamble is enabled we should set the
770 * preamble bit for the signal.
772 if (DEVICE_GET_RATE_FIELD(tx_rate
, PREAMBLE
))
776 rt2x00dev
->ops
->lib
->write_tx_desc(rt2x00dev
, skb
, &desc
, control
);
781 skbdesc
->entry
->skb
= skb
;
782 memcpy(&skbdesc
->entry
->tx_status
.control
, control
, sizeof(*control
));
785 * The frame has been completely initialized and ready
786 * for sending to the device. The caller will push the
787 * frame to the device, but we are going to push the
788 * frame to debugfs here.
790 skbdesc
->frame_type
= DUMP_FRAME_TX
;
791 rt2x00debug_dump_frame(rt2x00dev
, skb
);
793 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc
);
796 * Driver initialization handlers.
798 static void rt2x00lib_channel(struct ieee80211_channel
*entry
,
799 const int channel
, const int tx_power
,
802 entry
->chan
= channel
;
804 entry
->freq
= 2407 + (5 * channel
);
806 entry
->freq
= 5000 + (5 * channel
);
809 IEEE80211_CHAN_W_IBSS
|
810 IEEE80211_CHAN_W_ACTIVE_SCAN
|
811 IEEE80211_CHAN_W_SCAN
;
812 entry
->power_level
= tx_power
;
813 entry
->antenna_max
= 0xff;
816 static void rt2x00lib_rate(struct ieee80211_rate
*entry
,
817 const int rate
, const int mask
,
818 const int plcp
, const int flags
)
822 DEVICE_SET_RATE_FIELD(rate
, RATE
) |
823 DEVICE_SET_RATE_FIELD(mask
, RATEMASK
) |
824 DEVICE_SET_RATE_FIELD(plcp
, PLCP
);
825 entry
->flags
= flags
;
826 entry
->val2
= entry
->val
;
827 if (entry
->flags
& IEEE80211_RATE_PREAMBLE2
)
828 entry
->val2
|= DEVICE_SET_RATE_FIELD(1, PREAMBLE
);
829 entry
->min_rssi_ack
= 0;
830 entry
->min_rssi_ack_delta
= 0;
833 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev
*rt2x00dev
,
834 struct hw_mode_spec
*spec
)
836 struct ieee80211_hw
*hw
= rt2x00dev
->hw
;
837 struct ieee80211_hw_mode
*hwmodes
;
838 struct ieee80211_channel
*channels
;
839 struct ieee80211_rate
*rates
;
841 unsigned char tx_power
;
843 hwmodes
= kzalloc(sizeof(*hwmodes
) * spec
->num_modes
, GFP_KERNEL
);
847 channels
= kzalloc(sizeof(*channels
) * spec
->num_channels
, GFP_KERNEL
);
849 goto exit_free_modes
;
851 rates
= kzalloc(sizeof(*rates
) * spec
->num_rates
, GFP_KERNEL
);
853 goto exit_free_channels
;
856 * Initialize Rate list.
858 rt2x00lib_rate(&rates
[0], 10, DEV_RATEMASK_1MB
,
859 0x00, IEEE80211_RATE_CCK
);
860 rt2x00lib_rate(&rates
[1], 20, DEV_RATEMASK_2MB
,
861 0x01, IEEE80211_RATE_CCK_2
);
862 rt2x00lib_rate(&rates
[2], 55, DEV_RATEMASK_5_5MB
,
863 0x02, IEEE80211_RATE_CCK_2
);
864 rt2x00lib_rate(&rates
[3], 110, DEV_RATEMASK_11MB
,
865 0x03, IEEE80211_RATE_CCK_2
);
867 if (spec
->num_rates
> 4) {
868 rt2x00lib_rate(&rates
[4], 60, DEV_RATEMASK_6MB
,
869 0x0b, IEEE80211_RATE_OFDM
);
870 rt2x00lib_rate(&rates
[5], 90, DEV_RATEMASK_9MB
,
871 0x0f, IEEE80211_RATE_OFDM
);
872 rt2x00lib_rate(&rates
[6], 120, DEV_RATEMASK_12MB
,
873 0x0a, IEEE80211_RATE_OFDM
);
874 rt2x00lib_rate(&rates
[7], 180, DEV_RATEMASK_18MB
,
875 0x0e, IEEE80211_RATE_OFDM
);
876 rt2x00lib_rate(&rates
[8], 240, DEV_RATEMASK_24MB
,
877 0x09, IEEE80211_RATE_OFDM
);
878 rt2x00lib_rate(&rates
[9], 360, DEV_RATEMASK_36MB
,
879 0x0d, IEEE80211_RATE_OFDM
);
880 rt2x00lib_rate(&rates
[10], 480, DEV_RATEMASK_48MB
,
881 0x08, IEEE80211_RATE_OFDM
);
882 rt2x00lib_rate(&rates
[11], 540, DEV_RATEMASK_54MB
,
883 0x0c, IEEE80211_RATE_OFDM
);
887 * Initialize Channel list.
889 for (i
= 0; i
< spec
->num_channels
; i
++) {
890 if (spec
->channels
[i
].channel
<= 14)
891 tx_power
= spec
->tx_power_bg
[i
];
892 else if (spec
->tx_power_a
)
893 tx_power
= spec
->tx_power_a
[i
];
895 tx_power
= spec
->tx_power_default
;
897 rt2x00lib_channel(&channels
[i
],
898 spec
->channels
[i
].channel
, tx_power
, i
);
902 * Intitialize 802.11b
906 if (spec
->num_modes
> HWMODE_B
) {
907 hwmodes
[HWMODE_B
].mode
= MODE_IEEE80211B
;
908 hwmodes
[HWMODE_B
].num_channels
= 14;
909 hwmodes
[HWMODE_B
].num_rates
= 4;
910 hwmodes
[HWMODE_B
].channels
= channels
;
911 hwmodes
[HWMODE_B
].rates
= rates
;
915 * Intitialize 802.11g
919 if (spec
->num_modes
> HWMODE_G
) {
920 hwmodes
[HWMODE_G
].mode
= MODE_IEEE80211G
;
921 hwmodes
[HWMODE_G
].num_channels
= 14;
922 hwmodes
[HWMODE_G
].num_rates
= spec
->num_rates
;
923 hwmodes
[HWMODE_G
].channels
= channels
;
924 hwmodes
[HWMODE_G
].rates
= rates
;
928 * Intitialize 802.11a
930 * Channels: OFDM, UNII, HiperLAN2.
932 if (spec
->num_modes
> HWMODE_A
) {
933 hwmodes
[HWMODE_A
].mode
= MODE_IEEE80211A
;
934 hwmodes
[HWMODE_A
].num_channels
= spec
->num_channels
- 14;
935 hwmodes
[HWMODE_A
].num_rates
= spec
->num_rates
- 4;
936 hwmodes
[HWMODE_A
].channels
= &channels
[14];
937 hwmodes
[HWMODE_A
].rates
= &rates
[4];
940 if (spec
->num_modes
> HWMODE_G
&&
941 ieee80211_register_hwmode(hw
, &hwmodes
[HWMODE_G
]))
942 goto exit_free_rates
;
944 if (spec
->num_modes
> HWMODE_B
&&
945 ieee80211_register_hwmode(hw
, &hwmodes
[HWMODE_B
]))
946 goto exit_free_rates
;
948 if (spec
->num_modes
> HWMODE_A
&&
949 ieee80211_register_hwmode(hw
, &hwmodes
[HWMODE_A
]))
950 goto exit_free_rates
;
952 rt2x00dev
->hwmodes
= hwmodes
;
966 ERROR(rt2x00dev
, "Allocation ieee80211 modes failed.\n");
970 static void rt2x00lib_remove_hw(struct rt2x00_dev
*rt2x00dev
)
972 if (test_bit(DEVICE_REGISTERED_HW
, &rt2x00dev
->flags
))
973 ieee80211_unregister_hw(rt2x00dev
->hw
);
975 if (likely(rt2x00dev
->hwmodes
)) {
976 kfree(rt2x00dev
->hwmodes
->channels
);
977 kfree(rt2x00dev
->hwmodes
->rates
);
978 kfree(rt2x00dev
->hwmodes
);
979 rt2x00dev
->hwmodes
= NULL
;
983 static int rt2x00lib_probe_hw(struct rt2x00_dev
*rt2x00dev
)
985 struct hw_mode_spec
*spec
= &rt2x00dev
->spec
;
989 * Initialize HW modes.
991 status
= rt2x00lib_probe_hw_modes(rt2x00dev
, spec
);
998 status
= ieee80211_register_hw(rt2x00dev
->hw
);
1000 rt2x00lib_remove_hw(rt2x00dev
);
1004 __set_bit(DEVICE_REGISTERED_HW
, &rt2x00dev
->flags
);
1010 * Initialization/uninitialization handlers.
1012 static int rt2x00lib_alloc_entries(struct data_ring
*ring
,
1013 const u16 max_entries
, const u16 data_size
,
1014 const u16 desc_size
)
1016 struct data_entry
*entry
;
1019 ring
->stats
.limit
= max_entries
;
1020 ring
->data_size
= data_size
;
1021 ring
->desc_size
= desc_size
;
1024 * Allocate all ring entries.
1026 entry
= kzalloc(ring
->stats
.limit
* sizeof(*entry
), GFP_KERNEL
);
1030 for (i
= 0; i
< ring
->stats
.limit
; i
++) {
1032 entry
[i
].ring
= ring
;
1033 entry
[i
].skb
= NULL
;
1034 entry
[i
].entry_idx
= i
;
1037 ring
->entry
= entry
;
1042 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev
*rt2x00dev
)
1044 struct data_ring
*ring
;
1047 * Allocate the RX ring.
1049 if (rt2x00lib_alloc_entries(rt2x00dev
->rx
, RX_ENTRIES
, DATA_FRAME_SIZE
,
1050 rt2x00dev
->ops
->rxd_size
))
1054 * First allocate the TX rings.
1056 txring_for_each(rt2x00dev
, ring
) {
1057 if (rt2x00lib_alloc_entries(ring
, TX_ENTRIES
, DATA_FRAME_SIZE
,
1058 rt2x00dev
->ops
->txd_size
))
1062 if (!test_bit(DRIVER_REQUIRE_BEACON_RING
, &rt2x00dev
->flags
))
1066 * Allocate the BEACON ring.
1068 if (rt2x00lib_alloc_entries(&rt2x00dev
->bcn
[0], BEACON_ENTRIES
,
1069 MGMT_FRAME_SIZE
, rt2x00dev
->ops
->txd_size
))
1073 * Allocate the Atim ring.
1075 if (rt2x00lib_alloc_entries(&rt2x00dev
->bcn
[1], ATIM_ENTRIES
,
1076 DATA_FRAME_SIZE
, rt2x00dev
->ops
->txd_size
))
1082 static void rt2x00lib_free_ring_entries(struct rt2x00_dev
*rt2x00dev
)
1084 struct data_ring
*ring
;
1086 ring_for_each(rt2x00dev
, ring
) {
1092 static void rt2x00lib_uninitialize(struct rt2x00_dev
*rt2x00dev
)
1094 if (!__test_and_clear_bit(DEVICE_INITIALIZED
, &rt2x00dev
->flags
))
1098 * Unregister rfkill.
1100 rt2x00rfkill_unregister(rt2x00dev
);
1103 * Allow the HW to uninitialize.
1105 rt2x00dev
->ops
->lib
->uninitialize(rt2x00dev
);
1108 * Free allocated ring entries.
1110 rt2x00lib_free_ring_entries(rt2x00dev
);
1113 static int rt2x00lib_initialize(struct rt2x00_dev
*rt2x00dev
)
1117 if (test_bit(DEVICE_INITIALIZED
, &rt2x00dev
->flags
))
1121 * Allocate all ring entries.
1123 status
= rt2x00lib_alloc_ring_entries(rt2x00dev
);
1125 ERROR(rt2x00dev
, "Ring entries allocation failed.\n");
1130 * Initialize the device.
1132 status
= rt2x00dev
->ops
->lib
->initialize(rt2x00dev
);
1136 __set_bit(DEVICE_INITIALIZED
, &rt2x00dev
->flags
);
1139 * Register the rfkill handler.
1141 status
= rt2x00rfkill_register(rt2x00dev
);
1143 goto exit_unitialize
;
1148 rt2x00lib_uninitialize(rt2x00dev
);
1151 rt2x00lib_free_ring_entries(rt2x00dev
);
1156 int rt2x00lib_start(struct rt2x00_dev
*rt2x00dev
)
1160 if (test_bit(DEVICE_STARTED
, &rt2x00dev
->flags
))
1164 * If this is the first interface which is added,
1165 * we should load the firmware now.
1167 if (test_bit(DRIVER_REQUIRE_FIRMWARE
, &rt2x00dev
->flags
)) {
1168 retval
= rt2x00lib_load_firmware(rt2x00dev
);
1174 * Initialize the device.
1176 retval
= rt2x00lib_initialize(rt2x00dev
);
1183 retval
= rt2x00lib_enable_radio(rt2x00dev
);
1185 rt2x00lib_uninitialize(rt2x00dev
);
1189 __set_bit(DEVICE_STARTED
, &rt2x00dev
->flags
);
1194 void rt2x00lib_stop(struct rt2x00_dev
*rt2x00dev
)
1196 if (!test_bit(DEVICE_STARTED
, &rt2x00dev
->flags
))
1200 * Perhaps we can add something smarter here,
1201 * but for now just disabling the radio should do.
1203 rt2x00lib_disable_radio(rt2x00dev
);
1205 __clear_bit(DEVICE_STARTED
, &rt2x00dev
->flags
);
1209 * driver allocation handlers.
1211 static int rt2x00lib_alloc_rings(struct rt2x00_dev
*rt2x00dev
)
1213 struct data_ring
*ring
;
1217 * We need the following rings:
1220 * Beacon: 1 (if required)
1221 * Atim: 1 (if required)
1223 rt2x00dev
->data_rings
= 1 + rt2x00dev
->hw
->queues
+
1224 (2 * test_bit(DRIVER_REQUIRE_BEACON_RING
, &rt2x00dev
->flags
));
1226 ring
= kzalloc(rt2x00dev
->data_rings
* sizeof(*ring
), GFP_KERNEL
);
1228 ERROR(rt2x00dev
, "Ring allocation failed.\n");
1233 * Initialize pointers
1235 rt2x00dev
->rx
= ring
;
1236 rt2x00dev
->tx
= &rt2x00dev
->rx
[1];
1237 if (test_bit(DRIVER_REQUIRE_BEACON_RING
, &rt2x00dev
->flags
))
1238 rt2x00dev
->bcn
= &rt2x00dev
->tx
[rt2x00dev
->hw
->queues
];
1241 * Initialize ring parameters.
1243 * TX: queue_idx = IEEE80211_TX_QUEUE_DATA0 + index
1244 * TX: cw_min: 2^5 = 32.
1245 * TX: cw_max: 2^10 = 1024.
1247 rt2x00dev
->rx
->rt2x00dev
= rt2x00dev
;
1248 rt2x00dev
->rx
->queue_idx
= 0;
1250 index
= IEEE80211_TX_QUEUE_DATA0
;
1251 txring_for_each(rt2x00dev
, ring
) {
1252 ring
->rt2x00dev
= rt2x00dev
;
1253 ring
->queue_idx
= index
++;
1254 ring
->tx_params
.aifs
= 2;
1255 ring
->tx_params
.cw_min
= 5;
1256 ring
->tx_params
.cw_max
= 10;
1262 static void rt2x00lib_free_rings(struct rt2x00_dev
*rt2x00dev
)
1264 kfree(rt2x00dev
->rx
);
1265 rt2x00dev
->rx
= NULL
;
1266 rt2x00dev
->tx
= NULL
;
1267 rt2x00dev
->bcn
= NULL
;
1270 int rt2x00lib_probe_dev(struct rt2x00_dev
*rt2x00dev
)
1272 int retval
= -ENOMEM
;
1275 * Let the driver probe the device to detect the capabilities.
1277 retval
= rt2x00dev
->ops
->lib
->probe_hw(rt2x00dev
);
1279 ERROR(rt2x00dev
, "Failed to allocate device.\n");
1284 * Initialize configuration work.
1286 INIT_WORK(&rt2x00dev
->beacon_work
, rt2x00lib_beacondone_scheduled
);
1287 INIT_WORK(&rt2x00dev
->filter_work
, rt2x00lib_packetfilter_scheduled
);
1288 INIT_WORK(&rt2x00dev
->config_work
, rt2x00lib_configuration_scheduled
);
1289 INIT_DELAYED_WORK(&rt2x00dev
->link
.work
, rt2x00lib_link_tuner
);
1292 * Reset current working type.
1294 rt2x00dev
->interface
.type
= IEEE80211_IF_TYPE_INVALID
;
1297 * Allocate ring array.
1299 retval
= rt2x00lib_alloc_rings(rt2x00dev
);
1304 * Initialize ieee80211 structure.
1306 retval
= rt2x00lib_probe_hw(rt2x00dev
);
1308 ERROR(rt2x00dev
, "Failed to initialize hw.\n");
1315 retval
= rt2x00rfkill_allocate(rt2x00dev
);
1320 * Open the debugfs entry.
1322 rt2x00debug_register(rt2x00dev
);
1324 __set_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
);
1329 rt2x00lib_remove_dev(rt2x00dev
);
1333 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev
);
1335 void rt2x00lib_remove_dev(struct rt2x00_dev
*rt2x00dev
)
1337 __clear_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
);
1342 rt2x00lib_disable_radio(rt2x00dev
);
1345 * Uninitialize device.
1347 rt2x00lib_uninitialize(rt2x00dev
);
1350 * Close debugfs entry.
1352 rt2x00debug_deregister(rt2x00dev
);
1357 rt2x00rfkill_free(rt2x00dev
);
1360 * Free ieee80211_hw memory.
1362 rt2x00lib_remove_hw(rt2x00dev
);
1365 * Free firmware image.
1367 rt2x00lib_free_firmware(rt2x00dev
);
1370 * Free ring structures.
1372 rt2x00lib_free_rings(rt2x00dev
);
1374 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev
);
1377 * Device state handlers
1380 int rt2x00lib_suspend(struct rt2x00_dev
*rt2x00dev
, pm_message_t state
)
1384 NOTICE(rt2x00dev
, "Going to sleep.\n");
1385 __clear_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
);
1388 * Only continue if mac80211 has open interfaces.
1390 if (!test_bit(DEVICE_STARTED
, &rt2x00dev
->flags
))
1392 __set_bit(DEVICE_STARTED_SUSPEND
, &rt2x00dev
->flags
);
1395 * Disable radio and unitialize all items
1396 * that must be recreated on resume.
1398 rt2x00lib_stop(rt2x00dev
);
1399 rt2x00lib_uninitialize(rt2x00dev
);
1400 rt2x00debug_deregister(rt2x00dev
);
1404 * Set device mode to sleep for power management.
1406 retval
= rt2x00dev
->ops
->lib
->set_device_state(rt2x00dev
, STATE_SLEEP
);
1412 EXPORT_SYMBOL_GPL(rt2x00lib_suspend
);
1414 int rt2x00lib_resume(struct rt2x00_dev
*rt2x00dev
)
1416 struct interface
*intf
= &rt2x00dev
->interface
;
1419 NOTICE(rt2x00dev
, "Waking up.\n");
1422 * Open the debugfs entry.
1424 rt2x00debug_register(rt2x00dev
);
1427 * Only continue if mac80211 had open interfaces.
1429 if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND
, &rt2x00dev
->flags
))
1433 * Reinitialize device and all active interfaces.
1435 retval
= rt2x00lib_start(rt2x00dev
);
1440 * Reconfigure device.
1442 rt2x00lib_config(rt2x00dev
, &rt2x00dev
->hw
->conf
, 1);
1443 if (!rt2x00dev
->hw
->conf
.radio_enabled
)
1444 rt2x00lib_disable_radio(rt2x00dev
);
1446 rt2x00lib_config_mac_addr(rt2x00dev
, intf
->mac
);
1447 rt2x00lib_config_bssid(rt2x00dev
, intf
->bssid
);
1448 rt2x00lib_config_type(rt2x00dev
, intf
->type
);
1451 * We are ready again to receive requests from mac80211.
1453 __set_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
);
1456 * It is possible that during that mac80211 has attempted
1457 * to send frames while we were suspending or resuming.
1458 * In that case we have disabled the TX queue and should
1459 * now enable it again
1461 ieee80211_start_queues(rt2x00dev
->hw
);
1464 * When in Master or Ad-hoc mode,
1465 * restart Beacon transmitting by faking a beacondone event.
1467 if (intf
->type
== IEEE80211_IF_TYPE_AP
||
1468 intf
->type
== IEEE80211_IF_TYPE_IBSS
)
1469 rt2x00lib_beacondone(rt2x00dev
);
1474 rt2x00lib_disable_radio(rt2x00dev
);
1475 rt2x00lib_uninitialize(rt2x00dev
);
1476 rt2x00debug_deregister(rt2x00dev
);
1480 EXPORT_SYMBOL_GPL(rt2x00lib_resume
);
1481 #endif /* CONFIG_PM */
1484 * rt2x00lib module information.
1486 MODULE_AUTHOR(DRV_PROJECT
);
1487 MODULE_VERSION(DRV_VERSION
);
1488 MODULE_DESCRIPTION("rt2x00 library");
1489 MODULE_LICENSE("GPL");