1 /* ZD1211 USB-WLAN driver for Linux
3 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
4 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
5 * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
6 * Copyright (C) 2007-2008 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/slab.h>
26 #include <linux/usb.h>
27 #include <linux/jiffies.h>
28 #include <net/ieee80211_radiotap.h>
35 struct zd_reg_alpha2_map {
40 static struct zd_reg_alpha2_map reg_alpha2_map[] = {
41 { ZD_REGDOMAIN_FCC, "US" },
42 { ZD_REGDOMAIN_IC, "CA" },
43 { ZD_REGDOMAIN_ETSI, "DE" }, /* Generic ETSI, use most restrictive */
44 { ZD_REGDOMAIN_JAPAN, "JP" },
45 { ZD_REGDOMAIN_JAPAN_2, "JP" },
46 { ZD_REGDOMAIN_JAPAN_3, "JP" },
47 { ZD_REGDOMAIN_SPAIN, "ES" },
48 { ZD_REGDOMAIN_FRANCE, "FR" },
51 /* This table contains the hardware specific values for the modulation rates. */
52 static const struct ieee80211_rate zd_rates[] = {
54 .hw_value = ZD_CCK_RATE_1M, },
56 .hw_value = ZD_CCK_RATE_2M,
57 .hw_value_short = ZD_CCK_RATE_2M | ZD_CCK_PREA_SHORT,
58 .flags = IEEE80211_RATE_SHORT_PREAMBLE },
60 .hw_value = ZD_CCK_RATE_5_5M,
61 .hw_value_short = ZD_CCK_RATE_5_5M | ZD_CCK_PREA_SHORT,
62 .flags = IEEE80211_RATE_SHORT_PREAMBLE },
64 .hw_value = ZD_CCK_RATE_11M,
65 .hw_value_short = ZD_CCK_RATE_11M | ZD_CCK_PREA_SHORT,
66 .flags = IEEE80211_RATE_SHORT_PREAMBLE },
68 .hw_value = ZD_OFDM_RATE_6M,
71 .hw_value = ZD_OFDM_RATE_9M,
74 .hw_value = ZD_OFDM_RATE_12M,
77 .hw_value = ZD_OFDM_RATE_18M,
80 .hw_value = ZD_OFDM_RATE_24M,
83 .hw_value = ZD_OFDM_RATE_36M,
86 .hw_value = ZD_OFDM_RATE_48M,
89 .hw_value = ZD_OFDM_RATE_54M,
94 * Zydas retry rates table. Each line is listed in the same order as
95 * in zd_rates[] and contains all the rate used when a packet is sent
96 * starting with a given rates. Let's consider an example :
98 * "11 Mbits : 4, 3, 2, 1, 0" means :
99 * - packet is sent using 4 different rates
100 * - 1st rate is index 3 (ie 11 Mbits)
101 * - 2nd rate is index 2 (ie 5.5 Mbits)
102 * - 3rd rate is index 1 (ie 2 Mbits)
103 * - 4th rate is index 0 (ie 1 Mbits)
106 static const struct tx_retry_rate zd_retry_rates[] = {
107 { /* 1 Mbits */ 1, { 0 }},
108 { /* 2 Mbits */ 2, { 1, 0 }},
109 { /* 5.5 Mbits */ 3, { 2, 1, 0 }},
110 { /* 11 Mbits */ 4, { 3, 2, 1, 0 }},
111 { /* 6 Mbits */ 5, { 4, 3, 2, 1, 0 }},
112 { /* 9 Mbits */ 6, { 5, 4, 3, 2, 1, 0}},
113 { /* 12 Mbits */ 5, { 6, 3, 2, 1, 0 }},
114 { /* 18 Mbits */ 6, { 7, 6, 3, 2, 1, 0 }},
115 { /* 24 Mbits */ 6, { 8, 6, 3, 2, 1, 0 }},
116 { /* 36 Mbits */ 7, { 9, 8, 6, 3, 2, 1, 0 }},
117 { /* 48 Mbits */ 8, {10, 9, 8, 6, 3, 2, 1, 0 }},
118 { /* 54 Mbits */ 9, {11, 10, 9, 8, 6, 3, 2, 1, 0 }}
121 static const struct ieee80211_channel zd_channels[] = {
122 { .center_freq = 2412, .hw_value = 1 },
123 { .center_freq = 2417, .hw_value = 2 },
124 { .center_freq = 2422, .hw_value = 3 },
125 { .center_freq = 2427, .hw_value = 4 },
126 { .center_freq = 2432, .hw_value = 5 },
127 { .center_freq = 2437, .hw_value = 6 },
128 { .center_freq = 2442, .hw_value = 7 },
129 { .center_freq = 2447, .hw_value = 8 },
130 { .center_freq = 2452, .hw_value = 9 },
131 { .center_freq = 2457, .hw_value = 10 },
132 { .center_freq = 2462, .hw_value = 11 },
133 { .center_freq = 2467, .hw_value = 12 },
134 { .center_freq = 2472, .hw_value = 13 },
135 { .center_freq = 2484, .hw_value = 14 },
138 static void housekeeping_init(struct zd_mac *mac);
139 static void housekeeping_enable(struct zd_mac *mac);
140 static void housekeeping_disable(struct zd_mac *mac);
141 static void beacon_init(struct zd_mac *mac);
142 static void beacon_enable(struct zd_mac *mac);
143 static void beacon_disable(struct zd_mac *mac);
144 static void set_rts_cts(struct zd_mac *mac, unsigned int short_preamble);
145 static int zd_mac_config_beacon(struct ieee80211_hw *hw,
146 struct sk_buff *beacon);
148 static int zd_reg2alpha2(u8 regdomain, char *alpha2)
151 struct zd_reg_alpha2_map *reg_map;
152 for (i = 0; i < ARRAY_SIZE(reg_alpha2_map); i++) {
153 reg_map = ®_alpha2_map[i];
154 if (regdomain == reg_map->reg) {
155 alpha2[0] = reg_map->alpha2[0];
156 alpha2[1] = reg_map->alpha2[1];
163 static int zd_check_signal(struct ieee80211_hw *hw, int signal)
165 struct zd_mac *mac = zd_hw_mac(hw);
167 dev_dbg_f_cond(zd_mac_dev(mac), signal < 0 || signal > 100,
168 "%s: signal value from device not in range 0..100, "
169 "but %d.\n", __func__, signal);
173 else if (signal > 100)
179 int zd_mac_preinit_hw(struct ieee80211_hw *hw)
183 struct zd_mac *mac = zd_hw_mac(hw);
185 r = zd_chip_read_mac_addr_fw(&mac->chip, addr);
189 SET_IEEE80211_PERM_ADDR(hw, addr);
194 int zd_mac_init_hw(struct ieee80211_hw *hw)
197 struct zd_mac *mac = zd_hw_mac(hw);
198 struct zd_chip *chip = &mac->chip;
200 u8 default_regdomain;
202 r = zd_chip_enable_int(chip);
205 r = zd_chip_init_hw(chip);
209 ZD_ASSERT(!irqs_disabled());
211 r = zd_read_regdomain(chip, &default_regdomain);
214 spin_lock_irq(&mac->lock);
215 mac->regdomain = mac->default_regdomain = default_regdomain;
216 spin_unlock_irq(&mac->lock);
218 /* We must inform the device that we are doing encryption/decryption in
219 * software at the moment. */
220 r = zd_set_encryption_type(chip, ENC_SNIFFER);
224 r = zd_reg2alpha2(mac->regdomain, alpha2);
228 r = regulatory_hint(hw->wiphy, alpha2);
230 zd_chip_disable_int(chip);
235 void zd_mac_clear(struct zd_mac *mac)
237 flush_workqueue(zd_workqueue);
238 zd_chip_clear(&mac->chip);
239 ZD_ASSERT(!spin_is_locked(&mac->lock));
240 ZD_MEMCLEAR(mac, sizeof(struct zd_mac));
243 static int set_rx_filter(struct zd_mac *mac)
246 u32 filter = STA_RX_FILTER;
248 spin_lock_irqsave(&mac->lock, flags);
250 filter |= RX_FILTER_CTRL;
251 spin_unlock_irqrestore(&mac->lock, flags);
253 return zd_iowrite32(&mac->chip, CR_RX_FILTER, filter);
256 static int set_mac_and_bssid(struct zd_mac *mac)
263 r = zd_write_mac_addr(&mac->chip, mac->vif->addr);
267 /* Vendor driver after setting MAC either sets BSSID for AP or
268 * filter for other modes.
270 if (mac->type != NL80211_IFTYPE_AP)
271 return set_rx_filter(mac);
273 return zd_write_bssid(&mac->chip, mac->vif->addr);
276 static int set_mc_hash(struct zd_mac *mac)
278 struct zd_mc_hash hash;
280 return zd_chip_set_multicast_hash(&mac->chip, &hash);
283 int zd_op_start(struct ieee80211_hw *hw)
285 struct zd_mac *mac = zd_hw_mac(hw);
286 struct zd_chip *chip = &mac->chip;
287 struct zd_usb *usb = &chip->usb;
290 if (!usb->initialized) {
291 r = zd_usb_init_hw(usb);
296 r = zd_chip_enable_int(chip);
300 r = zd_chip_set_basic_rates(chip, CR_RATES_80211B | CR_RATES_80211G);
303 r = set_rx_filter(mac);
306 r = set_mc_hash(mac);
309 r = zd_chip_switch_radio_on(chip);
312 r = zd_chip_enable_rxtx(chip);
315 r = zd_chip_enable_hwint(chip);
319 housekeeping_enable(mac);
321 set_bit(ZD_DEVICE_RUNNING, &mac->flags);
324 zd_chip_disable_rxtx(chip);
326 zd_chip_switch_radio_off(chip);
328 zd_chip_disable_int(chip);
333 void zd_op_stop(struct ieee80211_hw *hw)
335 struct zd_mac *mac = zd_hw_mac(hw);
336 struct zd_chip *chip = &mac->chip;
338 struct sk_buff_head *ack_wait_queue = &mac->ack_wait_queue;
340 clear_bit(ZD_DEVICE_RUNNING, &mac->flags);
342 /* The order here deliberately is a little different from the open()
343 * method, since we need to make sure there is no opportunity for RX
344 * frames to be processed by mac80211 after we have stopped it.
347 zd_chip_disable_rxtx(chip);
349 housekeeping_disable(mac);
350 flush_workqueue(zd_workqueue);
352 zd_chip_disable_hwint(chip);
353 zd_chip_switch_radio_off(chip);
354 zd_chip_disable_int(chip);
357 while ((skb = skb_dequeue(ack_wait_queue)))
358 dev_kfree_skb_any(skb);
361 int zd_restore_settings(struct zd_mac *mac)
363 struct sk_buff *beacon;
364 struct zd_mc_hash multicast_hash;
365 unsigned int short_preamble;
366 int r, beacon_interval, beacon_period;
369 dev_dbg_f(zd_mac_dev(mac), "\n");
371 spin_lock_irq(&mac->lock);
372 multicast_hash = mac->multicast_hash;
373 short_preamble = mac->short_preamble;
374 beacon_interval = mac->beacon.interval;
375 beacon_period = mac->beacon.period;
376 channel = mac->channel;
377 spin_unlock_irq(&mac->lock);
379 r = set_mac_and_bssid(mac);
381 dev_dbg_f(zd_mac_dev(mac), "set_mac_and_bssid failed, %d\n", r);
385 r = zd_chip_set_channel(&mac->chip, channel);
387 dev_dbg_f(zd_mac_dev(mac), "zd_chip_set_channel failed, %d\n",
392 set_rts_cts(mac, short_preamble);
394 r = zd_chip_set_multicast_hash(&mac->chip, &multicast_hash);
396 dev_dbg_f(zd_mac_dev(mac),
397 "zd_chip_set_multicast_hash failed, %d\n", r);
401 if (mac->type == NL80211_IFTYPE_MESH_POINT ||
402 mac->type == NL80211_IFTYPE_ADHOC ||
403 mac->type == NL80211_IFTYPE_AP) {
404 if (mac->vif != NULL) {
405 beacon = ieee80211_beacon_get(mac->hw, mac->vif);
407 zd_mac_config_beacon(mac->hw, beacon);
412 zd_set_beacon_interval(&mac->chip, beacon_interval,
413 beacon_period, mac->type);
415 spin_lock_irq(&mac->lock);
416 mac->beacon.last_update = jiffies;
417 spin_unlock_irq(&mac->lock);
424 * zd_mac_tx_status - reports tx status of a packet if required
425 * @hw - a &struct ieee80211_hw pointer
427 * @flags: extra flags to set in the TX status info
428 * @ackssi: ACK signal strength
429 * @success - True for successful transmission of the frame
431 * This information calls ieee80211_tx_status_irqsafe() if required by the
432 * control information. It copies the control information into the status
435 * If no status information has been requested, the skb is freed.
437 static void zd_mac_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
438 int ackssi, struct tx_status *tx_status)
440 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
442 int success = 1, retry = 1;
444 const struct tx_retry_rate *retries;
446 ieee80211_tx_info_clear_status(info);
449 success = !tx_status->failure;
450 retry = tx_status->retry + success;
455 info->flags |= IEEE80211_TX_STAT_ACK;
458 info->flags &= ~IEEE80211_TX_STAT_ACK;
461 first_idx = info->status.rates[0].idx;
462 ZD_ASSERT(0<=first_idx && first_idx<ARRAY_SIZE(zd_retry_rates));
463 retries = &zd_retry_rates[first_idx];
464 ZD_ASSERT(1 <= retry && retry <= retries->count);
466 info->status.rates[0].idx = retries->rate[0];
467 info->status.rates[0].count = 1; // (retry > 1 ? 2 : 1);
469 for (i=1; i<IEEE80211_TX_MAX_RATES-1 && i<retry; i++) {
470 info->status.rates[i].idx = retries->rate[i];
471 info->status.rates[i].count = 1; // ((i==retry-1) && success ? 1:2);
473 for (; i<IEEE80211_TX_MAX_RATES && i<retry; i++) {
474 info->status.rates[i].idx = retries->rate[retry - 1];
475 info->status.rates[i].count = 1; // (success ? 1:2);
477 if (i<IEEE80211_TX_MAX_RATES)
478 info->status.rates[i].idx = -1; /* terminate */
480 info->status.ack_signal = zd_check_signal(hw, ackssi);
481 ieee80211_tx_status_irqsafe(hw, skb);
485 * zd_mac_tx_failed - callback for failed frames
486 * @dev: the mac80211 wireless device
488 * This function is called if a frame couldn't be successfully
489 * transferred. The first frame from the tx queue, will be selected and
490 * reported as error to the upper layers.
492 void zd_mac_tx_failed(struct urb *urb)
494 struct ieee80211_hw * hw = zd_usb_to_hw(urb->context);
495 struct zd_mac *mac = zd_hw_mac(hw);
496 struct sk_buff_head *q = &mac->ack_wait_queue;
498 struct tx_status *tx_status = (struct tx_status *)urb->transfer_buffer;
500 int success = !tx_status->failure;
501 int retry = tx_status->retry + success;
505 q = &mac->ack_wait_queue;
506 spin_lock_irqsave(&q->lock, flags);
508 skb_queue_walk(q, skb) {
509 struct ieee80211_hdr *tx_hdr;
510 struct ieee80211_tx_info *info;
511 int first_idx, final_idx;
512 const struct tx_retry_rate *retries;
517 /* if the hardware reports a failure and we had a 802.11 ACK
518 * pending, then we skip the first skb when searching for a
520 if (tx_status->failure && mac->ack_pending &&
521 skb_queue_is_first(q, skb)) {
525 tx_hdr = (struct ieee80211_hdr *)skb->data;
527 /* we skip all frames not matching the reported destination */
528 if (unlikely(memcmp(tx_hdr->addr1, tx_status->mac, ETH_ALEN))) {
532 /* we skip all frames not matching the reported final rate */
534 info = IEEE80211_SKB_CB(skb);
535 first_idx = info->status.rates[0].idx;
536 ZD_ASSERT(0<=first_idx && first_idx<ARRAY_SIZE(zd_retry_rates));
537 retries = &zd_retry_rates[first_idx];
538 if (retry <= 0 || retry > retries->count)
541 final_idx = retries->rate[retry - 1];
542 final_rate = zd_rates[final_idx].hw_value;
544 if (final_rate != tx_status->rate) {
553 for (i=1; i<=position; i++) {
554 skb = __skb_dequeue(q);
555 zd_mac_tx_status(hw, skb,
556 mac->ack_pending ? mac->ack_signal : 0,
557 i == position ? tx_status : NULL);
558 mac->ack_pending = 0;
562 spin_unlock_irqrestore(&q->lock, flags);
566 * zd_mac_tx_to_dev - callback for USB layer
567 * @skb: a &sk_buff pointer
568 * @error: error value, 0 if transmission successful
570 * Informs the MAC layer that the frame has successfully transferred to the
571 * device. If an ACK is required and the transfer to the device has been
572 * successful, the packets are put on the @ack_wait_queue with
573 * the control set removed.
575 void zd_mac_tx_to_dev(struct sk_buff *skb, int error)
577 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
578 struct ieee80211_hw *hw = info->rate_driver_data[0];
579 struct zd_mac *mac = zd_hw_mac(hw);
581 ieee80211_tx_info_clear_status(info);
583 skb_pull(skb, sizeof(struct zd_ctrlset));
584 if (unlikely(error ||
585 (info->flags & IEEE80211_TX_CTL_NO_ACK))) {
587 * FIXME : do we need to fill in anything ?
589 ieee80211_tx_status_irqsafe(hw, skb);
591 struct sk_buff_head *q = &mac->ack_wait_queue;
593 skb_queue_tail(q, skb);
594 while (skb_queue_len(q) > ZD_MAC_MAX_ACK_WAITERS) {
595 zd_mac_tx_status(hw, skb_dequeue(q),
596 mac->ack_pending ? mac->ack_signal : 0,
598 mac->ack_pending = 0;
603 static int zd_calc_tx_length_us(u8 *service, u8 zd_rate, u16 tx_length)
605 /* ZD_PURE_RATE() must be used to remove the modulation type flag of
606 * the zd-rate values.
608 static const u8 rate_divisor[] = {
609 [ZD_PURE_RATE(ZD_CCK_RATE_1M)] = 1,
610 [ZD_PURE_RATE(ZD_CCK_RATE_2M)] = 2,
611 /* Bits must be doubled. */
612 [ZD_PURE_RATE(ZD_CCK_RATE_5_5M)] = 11,
613 [ZD_PURE_RATE(ZD_CCK_RATE_11M)] = 11,
614 [ZD_PURE_RATE(ZD_OFDM_RATE_6M)] = 6,
615 [ZD_PURE_RATE(ZD_OFDM_RATE_9M)] = 9,
616 [ZD_PURE_RATE(ZD_OFDM_RATE_12M)] = 12,
617 [ZD_PURE_RATE(ZD_OFDM_RATE_18M)] = 18,
618 [ZD_PURE_RATE(ZD_OFDM_RATE_24M)] = 24,
619 [ZD_PURE_RATE(ZD_OFDM_RATE_36M)] = 36,
620 [ZD_PURE_RATE(ZD_OFDM_RATE_48M)] = 48,
621 [ZD_PURE_RATE(ZD_OFDM_RATE_54M)] = 54,
624 u32 bits = (u32)tx_length * 8;
627 divisor = rate_divisor[ZD_PURE_RATE(zd_rate)];
632 case ZD_CCK_RATE_5_5M:
633 bits = (2*bits) + 10; /* round up to the next integer */
635 case ZD_CCK_RATE_11M:
638 *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
639 if (0 < t && t <= 3) {
640 *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
643 bits += 10; /* round up to the next integer */
650 static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
651 struct ieee80211_hdr *header,
652 struct ieee80211_tx_info *info)
656 * - if backoff needed, enable bit 0
657 * - if burst (backoff not needed) disable bit 0
663 if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
664 cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
666 /* No ACK expected (multicast, etc.) */
667 if (info->flags & IEEE80211_TX_CTL_NO_ACK)
668 cs->control |= ZD_CS_NO_ACK;
671 if (ieee80211_is_pspoll(header->frame_control))
672 cs->control |= ZD_CS_PS_POLL_FRAME;
674 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
675 cs->control |= ZD_CS_RTS;
677 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
678 cs->control |= ZD_CS_SELF_CTS;
680 /* FIXME: Management frame? */
683 static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon)
685 struct zd_mac *mac = zd_hw_mac(hw);
686 int r, ret, num_cmds, req_pos = 0;
688 /* 4 more bytes for tail CRC */
689 u32 full_len = beacon->len + 4;
690 unsigned long end_jiffies, message_jiffies;
691 struct zd_ioreq32 *ioreqs;
693 /* Alloc memory for full beacon write at once. */
694 num_cmds = 1 + zd_chip_is_zd1211b(&mac->chip) + full_len;
695 ioreqs = kmalloc(num_cmds * sizeof(struct zd_ioreq32), GFP_KERNEL);
699 mutex_lock(&mac->chip.mutex);
701 r = zd_iowrite32_locked(&mac->chip, 0, CR_BCN_FIFO_SEMAPHORE);
704 r = zd_ioread32_locked(&mac->chip, &tmp, CR_BCN_FIFO_SEMAPHORE);
708 end_jiffies = jiffies + HZ / 2; /*~500ms*/
709 message_jiffies = jiffies + HZ / 10; /*~100ms*/
711 r = zd_ioread32_locked(&mac->chip, &tmp, CR_BCN_FIFO_SEMAPHORE);
714 if (time_is_before_eq_jiffies(message_jiffies)) {
715 message_jiffies = jiffies + HZ / 10;
716 dev_err(zd_mac_dev(mac),
717 "CR_BCN_FIFO_SEMAPHORE not ready\n");
718 if (time_is_before_eq_jiffies(end_jiffies)) {
719 dev_err(zd_mac_dev(mac),
720 "Giving up beacon config.\n");
728 ioreqs[req_pos].addr = CR_BCN_FIFO;
729 ioreqs[req_pos].value = full_len - 1;
731 if (zd_chip_is_zd1211b(&mac->chip)) {
732 ioreqs[req_pos].addr = CR_BCN_LENGTH;
733 ioreqs[req_pos].value = full_len - 1;
737 for (j = 0 ; j < beacon->len; j++) {
738 ioreqs[req_pos].addr = CR_BCN_FIFO;
739 ioreqs[req_pos].value = *((u8 *)(beacon->data + j));
743 for (j = 0; j < 4; j++) {
744 ioreqs[req_pos].addr = CR_BCN_FIFO;
745 ioreqs[req_pos].value = 0x0;
749 BUG_ON(req_pos != num_cmds);
751 r = zd_iowrite32a_locked(&mac->chip, ioreqs, num_cmds);
755 * Try very hard to release device beacon semaphore, as otherwise
756 * device/driver can be left in unusable state.
758 end_jiffies = jiffies + HZ / 2; /*~500ms*/
759 ret = zd_iowrite32_locked(&mac->chip, 1, CR_BCN_FIFO_SEMAPHORE);
761 if (time_is_before_eq_jiffies(end_jiffies)) {
767 ret = zd_iowrite32_locked(&mac->chip, 1, CR_BCN_FIFO_SEMAPHORE);
771 dev_err(zd_mac_dev(mac), "Could not release "
772 "CR_BCN_FIFO_SEMAPHORE!\n");
773 if (r < 0 || ret < 0) {
779 /* 802.11b/g 2.4G CCK 1Mb
780 * 802.11a, not yet implemented, uses different values (see GPL vendor
783 r = zd_iowrite32_locked(&mac->chip, 0x00000400 | (full_len << 19),
786 mutex_unlock(&mac->chip.mutex);
791 mutex_unlock(&mac->chip.mutex);
794 /* semaphore stuck, reset device to avoid fw freeze later */
795 dev_warn(zd_mac_dev(mac), "CR_BCN_FIFO_SEMAPHORE stuck, "
796 "reseting device...");
797 usb_queue_reset_device(mac->chip.usb.intf);
802 static int fill_ctrlset(struct zd_mac *mac,
806 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
807 unsigned int frag_len = skb->len + FCS_LEN;
808 unsigned int packet_length;
809 struct ieee80211_rate *txrate;
810 struct zd_ctrlset *cs = (struct zd_ctrlset *)
811 skb_push(skb, sizeof(struct zd_ctrlset));
812 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
814 ZD_ASSERT(frag_len <= 0xffff);
816 txrate = ieee80211_get_tx_rate(mac->hw, info);
818 cs->modulation = txrate->hw_value;
819 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
820 cs->modulation = txrate->hw_value_short;
822 cs->tx_length = cpu_to_le16(frag_len);
824 cs_set_control(mac, cs, hdr, info);
826 packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
827 ZD_ASSERT(packet_length <= 0xffff);
828 /* ZD1211B: Computing the length difference this way, gives us
829 * flexibility to compute the packet length.
831 cs->packet_length = cpu_to_le16(zd_chip_is_zd1211b(&mac->chip) ?
832 packet_length - frag_len : packet_length);
836 * - transmit frame length in microseconds
837 * - seems to be derived from frame length
838 * - see Cal_Us_Service() in zdinlinef.h
839 * - if macp->bTxBurstEnable is enabled, then multiply by 4
840 * - bTxBurstEnable is never set in the vendor driver
843 * - "for PLCP configuration"
844 * - always 0 except in some situations at 802.11b 11M
845 * - see line 53 of zdinlinef.h
848 r = zd_calc_tx_length_us(&cs->service, ZD_RATE(cs->modulation),
849 le16_to_cpu(cs->tx_length));
852 cs->current_length = cpu_to_le16(r);
853 cs->next_frame_length = 0;
859 * zd_op_tx - transmits a network frame to the device
861 * @dev: mac80211 hardware device
862 * @skb: socket buffer
863 * @control: the control structure
865 * This function transmit an IEEE 802.11 network frame to the device. The
866 * control block of the skbuff will be initialized. If necessary the incoming
867 * mac80211 queues will be stopped.
869 static void zd_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
871 struct zd_mac *mac = zd_hw_mac(hw);
872 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
875 r = fill_ctrlset(mac, skb);
879 info->rate_driver_data[0] = hw;
881 r = zd_usb_tx(&mac->chip.usb, skb);
891 * filter_ack - filters incoming packets for acknowledgements
892 * @dev: the mac80211 device
893 * @rx_hdr: received header
894 * @stats: the status for the received packet
896 * This functions looks for ACK packets and tries to match them with the
897 * frames in the tx queue. If a match is found the frame will be dequeued and
898 * the upper layers is informed about the successful transmission. If
899 * mac80211 queues have been stopped and the number of frames still to be
900 * transmitted is low the queues will be opened again.
902 * Returns 1 if the frame was an ACK, 0 if it was ignored.
904 static int filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr,
905 struct ieee80211_rx_status *stats)
907 struct zd_mac *mac = zd_hw_mac(hw);
909 struct sk_buff_head *q;
914 if (!ieee80211_is_ack(rx_hdr->frame_control))
917 q = &mac->ack_wait_queue;
918 spin_lock_irqsave(&q->lock, flags);
919 skb_queue_walk(q, skb) {
920 struct ieee80211_hdr *tx_hdr;
924 if (mac->ack_pending && skb_queue_is_first(q, skb))
927 tx_hdr = (struct ieee80211_hdr *)skb->data;
928 if (likely(!memcmp(tx_hdr->addr2, rx_hdr->addr1, ETH_ALEN)))
936 for (i=1; i<position; i++) {
937 skb = __skb_dequeue(q);
938 zd_mac_tx_status(hw, skb,
939 mac->ack_pending ? mac->ack_signal : 0,
941 mac->ack_pending = 0;
944 mac->ack_pending = 1;
945 mac->ack_signal = stats->signal;
947 /* Prevent pending tx-packet on AP-mode */
948 if (mac->type == NL80211_IFTYPE_AP) {
949 skb = __skb_dequeue(q);
950 zd_mac_tx_status(hw, skb, mac->ack_signal, NULL);
951 mac->ack_pending = 0;
955 spin_unlock_irqrestore(&q->lock, flags);
959 int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length)
961 struct zd_mac *mac = zd_hw_mac(hw);
962 struct ieee80211_rx_status stats;
963 const struct rx_status *status;
971 if (length < ZD_PLCP_HEADER_SIZE + 10 /* IEEE80211_1ADDR_LEN */ +
972 FCS_LEN + sizeof(struct rx_status))
975 memset(&stats, 0, sizeof(stats));
977 /* Note about pass_failed_fcs and pass_ctrl access below:
978 * mac locking intentionally omitted here, as this is the only unlocked
979 * reader and the only writer is configure_filter. Plus, if there were
980 * any races accessing these variables, it wouldn't really matter.
981 * If mac80211 ever provides a way for us to access filter flags
982 * from outside configure_filter, we could improve on this. Also, this
983 * situation may change once we implement some kind of DMA-into-skb
986 /* Caller has to ensure that length >= sizeof(struct rx_status). */
987 status = (struct rx_status *)
988 (buffer + (length - sizeof(struct rx_status)));
989 if (status->frame_status & ZD_RX_ERROR) {
990 if (mac->pass_failed_fcs &&
991 (status->frame_status & ZD_RX_CRC32_ERROR)) {
992 stats.flag |= RX_FLAG_FAILED_FCS_CRC;
999 stats.freq = zd_channels[_zd_chip_get_channel(&mac->chip) - 1].center_freq;
1000 stats.band = IEEE80211_BAND_2GHZ;
1001 stats.signal = zd_check_signal(hw, status->signal_strength);
1003 rate = zd_rx_rate(buffer, status);
1005 /* todo: return index in the big switches in zd_rx_rate instead */
1006 for (i = 0; i < mac->band.n_bitrates; i++)
1007 if (rate == mac->band.bitrates[i].hw_value)
1010 length -= ZD_PLCP_HEADER_SIZE + sizeof(struct rx_status);
1011 buffer += ZD_PLCP_HEADER_SIZE;
1013 /* Except for bad frames, filter each frame to see if it is an ACK, in
1014 * which case our internal TX tracking is updated. Normally we then
1015 * bail here as there's no need to pass ACKs on up to the stack, but
1016 * there is also the case where the stack has requested us to pass
1017 * control frames on up (pass_ctrl) which we must consider. */
1019 filter_ack(hw, (struct ieee80211_hdr *)buffer, &stats)
1023 fc = get_unaligned((__le16*)buffer);
1024 need_padding = ieee80211_is_data_qos(fc) ^ ieee80211_has_a4(fc);
1026 skb = dev_alloc_skb(length + (need_padding ? 2 : 0));
1030 /* Make sure the payload data is 4 byte aligned. */
1031 skb_reserve(skb, 2);
1034 /* FIXME : could we avoid this big memcpy ? */
1035 memcpy(skb_put(skb, length), buffer, length);
1037 memcpy(IEEE80211_SKB_RXCB(skb), &stats, sizeof(stats));
1038 ieee80211_rx_irqsafe(hw, skb);
1042 static int zd_op_add_interface(struct ieee80211_hw *hw,
1043 struct ieee80211_vif *vif)
1045 struct zd_mac *mac = zd_hw_mac(hw);
1047 /* using NL80211_IFTYPE_UNSPECIFIED to indicate no mode selected */
1048 if (mac->type != NL80211_IFTYPE_UNSPECIFIED)
1051 switch (vif->type) {
1052 case NL80211_IFTYPE_MONITOR:
1053 case NL80211_IFTYPE_MESH_POINT:
1054 case NL80211_IFTYPE_STATION:
1055 case NL80211_IFTYPE_ADHOC:
1056 case NL80211_IFTYPE_AP:
1057 mac->type = vif->type;
1065 return set_mac_and_bssid(mac);
1068 static void zd_op_remove_interface(struct ieee80211_hw *hw,
1069 struct ieee80211_vif *vif)
1071 struct zd_mac *mac = zd_hw_mac(hw);
1072 mac->type = NL80211_IFTYPE_UNSPECIFIED;
1074 zd_set_beacon_interval(&mac->chip, 0, 0, NL80211_IFTYPE_UNSPECIFIED);
1075 zd_write_mac_addr(&mac->chip, NULL);
1078 static int zd_op_config(struct ieee80211_hw *hw, u32 changed)
1080 struct zd_mac *mac = zd_hw_mac(hw);
1081 struct ieee80211_conf *conf = &hw->conf;
1083 spin_lock_irq(&mac->lock);
1084 mac->channel = conf->channel->hw_value;
1085 spin_unlock_irq(&mac->lock);
1087 return zd_chip_set_channel(&mac->chip, conf->channel->hw_value);
1090 static void zd_beacon_done(struct zd_mac *mac)
1092 struct sk_buff *skb, *beacon;
1094 if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1096 if (!mac->vif || mac->vif->type != NL80211_IFTYPE_AP)
1100 * Send out buffered broad- and multicast frames.
1102 while (!ieee80211_queue_stopped(mac->hw, 0)) {
1103 skb = ieee80211_get_buffered_bc(mac->hw, mac->vif);
1106 zd_op_tx(mac->hw, skb);
1110 * Fetch next beacon so that tim_count is updated.
1112 beacon = ieee80211_beacon_get(mac->hw, mac->vif);
1114 zd_mac_config_beacon(mac->hw, beacon);
1118 spin_lock_irq(&mac->lock);
1119 mac->beacon.last_update = jiffies;
1120 spin_unlock_irq(&mac->lock);
1123 static void zd_process_intr(struct work_struct *work)
1126 unsigned long flags;
1127 struct zd_mac *mac = container_of(work, struct zd_mac, process_intr);
1129 spin_lock_irqsave(&mac->lock, flags);
1130 int_status = le16_to_cpu(*(__le16 *)(mac->intr_buffer + 4));
1131 spin_unlock_irqrestore(&mac->lock, flags);
1133 if (int_status & INT_CFG_NEXT_BCN) {
1134 /*dev_dbg_f_limit(zd_mac_dev(mac), "INT_CFG_NEXT_BCN\n");*/
1135 zd_beacon_done(mac);
1137 dev_dbg_f(zd_mac_dev(mac), "Unsupported interrupt\n");
1140 zd_chip_enable_hwint(&mac->chip);
1144 static u64 zd_op_prepare_multicast(struct ieee80211_hw *hw,
1145 struct netdev_hw_addr_list *mc_list)
1147 struct zd_mac *mac = zd_hw_mac(hw);
1148 struct zd_mc_hash hash;
1149 struct netdev_hw_addr *ha;
1153 netdev_hw_addr_list_for_each(ha, mc_list) {
1154 dev_dbg_f(zd_mac_dev(mac), "mc addr %pM\n", ha->addr);
1155 zd_mc_add_addr(&hash, ha->addr);
1158 return hash.low | ((u64)hash.high << 32);
1161 #define SUPPORTED_FIF_FLAGS \
1162 (FIF_PROMISC_IN_BSS | FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \
1163 FIF_OTHER_BSS | FIF_BCN_PRBRESP_PROMISC)
1164 static void zd_op_configure_filter(struct ieee80211_hw *hw,
1165 unsigned int changed_flags,
1166 unsigned int *new_flags,
1169 struct zd_mc_hash hash = {
1171 .high = multicast >> 32,
1173 struct zd_mac *mac = zd_hw_mac(hw);
1174 unsigned long flags;
1177 /* Only deal with supported flags */
1178 changed_flags &= SUPPORTED_FIF_FLAGS;
1179 *new_flags &= SUPPORTED_FIF_FLAGS;
1182 * If multicast parameter (as returned by zd_op_prepare_multicast)
1183 * has changed, no bit in changed_flags is set. To handle this
1184 * situation, we do not return if changed_flags is 0. If we do so,
1185 * we will have some issue with IPv6 which uses multicast for link
1186 * layer address resolution.
1188 if (*new_flags & (FIF_PROMISC_IN_BSS | FIF_ALLMULTI))
1189 zd_mc_add_all(&hash);
1191 spin_lock_irqsave(&mac->lock, flags);
1192 mac->pass_failed_fcs = !!(*new_flags & FIF_FCSFAIL);
1193 mac->pass_ctrl = !!(*new_flags & FIF_CONTROL);
1194 mac->multicast_hash = hash;
1195 spin_unlock_irqrestore(&mac->lock, flags);
1197 zd_chip_set_multicast_hash(&mac->chip, &hash);
1199 if (changed_flags & FIF_CONTROL) {
1200 r = set_rx_filter(mac);
1202 dev_err(zd_mac_dev(mac), "set_rx_filter error %d\n", r);
1205 /* no handling required for FIF_OTHER_BSS as we don't currently
1206 * do BSSID filtering */
1207 /* FIXME: in future it would be nice to enable the probe response
1208 * filter (so that the driver doesn't see them) until
1209 * FIF_BCN_PRBRESP_PROMISC is set. however due to atomicity here, we'd
1210 * have to schedule work to enable prbresp reception, which might
1211 * happen too late. For now we'll just listen and forward them all the
1215 static void set_rts_cts(struct zd_mac *mac, unsigned int short_preamble)
1217 mutex_lock(&mac->chip.mutex);
1218 zd_chip_set_rts_cts_rate_locked(&mac->chip, short_preamble);
1219 mutex_unlock(&mac->chip.mutex);
1222 static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
1223 struct ieee80211_vif *vif,
1224 struct ieee80211_bss_conf *bss_conf,
1227 struct zd_mac *mac = zd_hw_mac(hw);
1230 dev_dbg_f(zd_mac_dev(mac), "changes: %x\n", changes);
1232 if (mac->type == NL80211_IFTYPE_MESH_POINT ||
1233 mac->type == NL80211_IFTYPE_ADHOC ||
1234 mac->type == NL80211_IFTYPE_AP) {
1236 if (changes & BSS_CHANGED_BEACON) {
1237 struct sk_buff *beacon = ieee80211_beacon_get(hw, vif);
1240 zd_chip_disable_hwint(&mac->chip);
1241 zd_mac_config_beacon(hw, beacon);
1242 zd_chip_enable_hwint(&mac->chip);
1247 if (changes & BSS_CHANGED_BEACON_ENABLED) {
1251 if (bss_conf->enable_beacon) {
1252 period = bss_conf->dtim_period;
1253 interval = bss_conf->beacon_int;
1256 spin_lock_irq(&mac->lock);
1257 mac->beacon.period = period;
1258 mac->beacon.interval = interval;
1259 mac->beacon.last_update = jiffies;
1260 spin_unlock_irq(&mac->lock);
1262 zd_set_beacon_interval(&mac->chip, interval, period,
1266 associated = is_valid_ether_addr(bss_conf->bssid);
1268 spin_lock_irq(&mac->lock);
1269 mac->associated = associated;
1270 spin_unlock_irq(&mac->lock);
1272 /* TODO: do hardware bssid filtering */
1274 if (changes & BSS_CHANGED_ERP_PREAMBLE) {
1275 spin_lock_irq(&mac->lock);
1276 mac->short_preamble = bss_conf->use_short_preamble;
1277 spin_unlock_irq(&mac->lock);
1279 set_rts_cts(mac, bss_conf->use_short_preamble);
1283 static u64 zd_op_get_tsf(struct ieee80211_hw *hw)
1285 struct zd_mac *mac = zd_hw_mac(hw);
1286 return zd_chip_get_tsf(&mac->chip);
1289 static const struct ieee80211_ops zd_ops = {
1291 .start = zd_op_start,
1293 .add_interface = zd_op_add_interface,
1294 .remove_interface = zd_op_remove_interface,
1295 .config = zd_op_config,
1296 .prepare_multicast = zd_op_prepare_multicast,
1297 .configure_filter = zd_op_configure_filter,
1298 .bss_info_changed = zd_op_bss_info_changed,
1299 .get_tsf = zd_op_get_tsf,
1302 struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf)
1305 struct ieee80211_hw *hw;
1307 hw = ieee80211_alloc_hw(sizeof(struct zd_mac), &zd_ops);
1309 dev_dbg_f(&intf->dev, "out of memory\n");
1313 mac = zd_hw_mac(hw);
1315 memset(mac, 0, sizeof(*mac));
1316 spin_lock_init(&mac->lock);
1319 mac->type = NL80211_IFTYPE_UNSPECIFIED;
1321 memcpy(mac->channels, zd_channels, sizeof(zd_channels));
1322 memcpy(mac->rates, zd_rates, sizeof(zd_rates));
1323 mac->band.n_bitrates = ARRAY_SIZE(zd_rates);
1324 mac->band.bitrates = mac->rates;
1325 mac->band.n_channels = ARRAY_SIZE(zd_channels);
1326 mac->band.channels = mac->channels;
1328 hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &mac->band;
1330 hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
1331 IEEE80211_HW_SIGNAL_UNSPEC |
1332 IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING;
1334 hw->wiphy->interface_modes =
1335 BIT(NL80211_IFTYPE_MESH_POINT) |
1336 BIT(NL80211_IFTYPE_STATION) |
1337 BIT(NL80211_IFTYPE_ADHOC) |
1338 BIT(NL80211_IFTYPE_AP);
1340 hw->max_signal = 100;
1342 hw->extra_tx_headroom = sizeof(struct zd_ctrlset);
1345 * Tell mac80211 that we support multi rate retries
1347 hw->max_rates = IEEE80211_TX_MAX_RATES;
1348 hw->max_rate_tries = 18; /* 9 rates * 2 retries/rate */
1350 skb_queue_head_init(&mac->ack_wait_queue);
1351 mac->ack_pending = 0;
1353 zd_chip_init(&mac->chip, hw, intf);
1354 housekeeping_init(mac);
1356 INIT_WORK(&mac->process_intr, zd_process_intr);
1358 SET_IEEE80211_DEV(hw, &intf->dev);
1362 #define BEACON_WATCHDOG_DELAY round_jiffies_relative(HZ)
1364 static void beacon_watchdog_handler(struct work_struct *work)
1366 struct zd_mac *mac =
1367 container_of(work, struct zd_mac, beacon.watchdog_work.work);
1368 struct sk_buff *beacon;
1369 unsigned long timeout;
1370 int interval, period;
1372 if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1374 if (mac->type != NL80211_IFTYPE_AP || !mac->vif)
1377 spin_lock_irq(&mac->lock);
1378 interval = mac->beacon.interval;
1379 period = mac->beacon.period;
1380 timeout = mac->beacon.last_update + msecs_to_jiffies(interval) + HZ;
1381 spin_unlock_irq(&mac->lock);
1383 if (interval > 0 && time_is_before_jiffies(timeout)) {
1384 dev_dbg_f(zd_mac_dev(mac), "beacon interrupt stalled, "
1386 "(interval: %d, dtim: %d)\n",
1389 zd_chip_disable_hwint(&mac->chip);
1391 beacon = ieee80211_beacon_get(mac->hw, mac->vif);
1393 zd_mac_config_beacon(mac->hw, beacon);
1397 zd_set_beacon_interval(&mac->chip, interval, period, mac->type);
1399 zd_chip_enable_hwint(&mac->chip);
1401 spin_lock_irq(&mac->lock);
1402 mac->beacon.last_update = jiffies;
1403 spin_unlock_irq(&mac->lock);
1407 queue_delayed_work(zd_workqueue, &mac->beacon.watchdog_work,
1408 BEACON_WATCHDOG_DELAY);
1411 static void beacon_init(struct zd_mac *mac)
1413 INIT_DELAYED_WORK(&mac->beacon.watchdog_work, beacon_watchdog_handler);
1416 static void beacon_enable(struct zd_mac *mac)
1418 dev_dbg_f(zd_mac_dev(mac), "\n");
1420 mac->beacon.last_update = jiffies;
1421 queue_delayed_work(zd_workqueue, &mac->beacon.watchdog_work,
1422 BEACON_WATCHDOG_DELAY);
1425 static void beacon_disable(struct zd_mac *mac)
1427 dev_dbg_f(zd_mac_dev(mac), "\n");
1428 cancel_delayed_work_sync(&mac->beacon.watchdog_work);
1431 #define LINK_LED_WORK_DELAY HZ
1433 static void link_led_handler(struct work_struct *work)
1435 struct zd_mac *mac =
1436 container_of(work, struct zd_mac, housekeeping.link_led_work.work);
1437 struct zd_chip *chip = &mac->chip;
1441 if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1444 spin_lock_irq(&mac->lock);
1445 is_associated = mac->associated;
1446 spin_unlock_irq(&mac->lock);
1448 r = zd_chip_control_leds(chip,
1449 is_associated ? ZD_LED_ASSOCIATED : ZD_LED_SCANNING);
1451 dev_dbg_f(zd_mac_dev(mac), "zd_chip_control_leds error %d\n", r);
1454 queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1455 LINK_LED_WORK_DELAY);
1458 static void housekeeping_init(struct zd_mac *mac)
1460 INIT_DELAYED_WORK(&mac->housekeeping.link_led_work, link_led_handler);
1463 static void housekeeping_enable(struct zd_mac *mac)
1465 dev_dbg_f(zd_mac_dev(mac), "\n");
1466 queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1470 static void housekeeping_disable(struct zd_mac *mac)
1472 dev_dbg_f(zd_mac_dev(mac), "\n");
1473 cancel_delayed_work_sync(&mac->housekeeping.link_led_work);
1474 zd_chip_control_leds(&mac->chip, ZD_LED_OFF);