zd_mac.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* ZD1211 USB-WLAN driver for Linux
   3 *
   4 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
   5 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
   6 * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
   7 * Copyright (C) 2007-2008 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
   8 */
   9
  10#include <linux/netdevice.h>
  11#include <linux/etherdevice.h>
  12#include <linux/slab.h>
  13#include <linux/usb.h>
  14#include <linux/jiffies.h>
  15#include <net/ieee80211_radiotap.h>
  16
  17#include "zd_def.h"
  18#include "zd_chip.h"
  19#include "zd_mac.h"
  20#include "zd_rf.h"
  21
  22struct zd_reg_alpha2_map {
  23	u32 reg;
  24	char alpha2[2] __nonstring;
  25};
  26
  27static struct zd_reg_alpha2_map reg_alpha2_map[] = {
  28	{ ZD_REGDOMAIN_FCC, "US" },
  29	{ ZD_REGDOMAIN_IC, "CA" },
  30	{ ZD_REGDOMAIN_ETSI, "DE" }, /* Generic ETSI, use most restrictive */
  31	{ ZD_REGDOMAIN_JAPAN, "JP" },
  32	{ ZD_REGDOMAIN_JAPAN_2, "JP" },
  33	{ ZD_REGDOMAIN_JAPAN_3, "JP" },
  34	{ ZD_REGDOMAIN_SPAIN, "ES" },
  35	{ ZD_REGDOMAIN_FRANCE, "FR" },
  36};
  37
  38/* This table contains the hardware specific values for the modulation rates. */
  39static const struct ieee80211_rate zd_rates[] = {
  40	{ .bitrate = 10,
  41	  .hw_value = ZD_CCK_RATE_1M, },
  42	{ .bitrate = 20,
  43	  .hw_value = ZD_CCK_RATE_2M,
  44	  .hw_value_short = ZD_CCK_RATE_2M | ZD_CCK_PREA_SHORT,
  45	  .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  46	{ .bitrate = 55,
  47	  .hw_value = ZD_CCK_RATE_5_5M,
  48	  .hw_value_short = ZD_CCK_RATE_5_5M | ZD_CCK_PREA_SHORT,
  49	  .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  50	{ .bitrate = 110,
  51	  .hw_value = ZD_CCK_RATE_11M,
  52	  .hw_value_short = ZD_CCK_RATE_11M | ZD_CCK_PREA_SHORT,
  53	  .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  54	{ .bitrate = 60,
  55	  .hw_value = ZD_OFDM_RATE_6M,
  56	  .flags = 0 },
  57	{ .bitrate = 90,
  58	  .hw_value = ZD_OFDM_RATE_9M,
  59	  .flags = 0 },
  60	{ .bitrate = 120,
  61	  .hw_value = ZD_OFDM_RATE_12M,
  62	  .flags = 0 },
  63	{ .bitrate = 180,
  64	  .hw_value = ZD_OFDM_RATE_18M,
  65	  .flags = 0 },
  66	{ .bitrate = 240,
  67	  .hw_value = ZD_OFDM_RATE_24M,
  68	  .flags = 0 },
  69	{ .bitrate = 360,
  70	  .hw_value = ZD_OFDM_RATE_36M,
  71	  .flags = 0 },
  72	{ .bitrate = 480,
  73	  .hw_value = ZD_OFDM_RATE_48M,
  74	  .flags = 0 },
  75	{ .bitrate = 540,
  76	  .hw_value = ZD_OFDM_RATE_54M,
  77	  .flags = 0 },
  78};
  79
  80/*
  81 * Zydas retry rates table. Each line is listed in the same order as
  82 * in zd_rates[] and contains all the rate used when a packet is sent
  83 * starting with a given rates. Let's consider an example :
  84 *
  85 * "11 Mbits : 4, 3, 2, 1, 0" means :
  86 * - packet is sent using 4 different rates
  87 * - 1st rate is index 3 (ie 11 Mbits)
  88 * - 2nd rate is index 2 (ie 5.5 Mbits)
  89 * - 3rd rate is index 1 (ie 2 Mbits)
  90 * - 4th rate is index 0 (ie 1 Mbits)
  91 */
  92
  93static const struct tx_retry_rate zd_retry_rates[] = {
  94	{ /*  1 Mbits */	1, { 0 }},
  95	{ /*  2 Mbits */	2, { 1,  0 }},
  96	{ /*  5.5 Mbits */	3, { 2,  1, 0 }},
  97	{ /* 11 Mbits */	4, { 3,  2, 1, 0 }},
  98	{ /*  6 Mbits */	5, { 4,  3, 2, 1, 0 }},
  99	{ /*  9 Mbits */	6, { 5,  4, 3, 2, 1, 0}},
 100	{ /* 12 Mbits */	5, { 6,  3, 2, 1, 0 }},
 101	{ /* 18 Mbits */	6, { 7,  6, 3, 2, 1, 0 }},
 102	{ /* 24 Mbits */	6, { 8,  6, 3, 2, 1, 0 }},
 103	{ /* 36 Mbits */	7, { 9,  8, 6, 3, 2, 1, 0 }},
 104	{ /* 48 Mbits */	8, {10,  9, 8, 6, 3, 2, 1, 0 }},
 105	{ /* 54 Mbits */	9, {11, 10, 9, 8, 6, 3, 2, 1, 0 }}
 106};
 107
 108static const struct ieee80211_channel zd_channels[] = {
 109	{ .center_freq = 2412, .hw_value = 1 },
 110	{ .center_freq = 2417, .hw_value = 2 },
 111	{ .center_freq = 2422, .hw_value = 3 },
 112	{ .center_freq = 2427, .hw_value = 4 },
 113	{ .center_freq = 2432, .hw_value = 5 },
 114	{ .center_freq = 2437, .hw_value = 6 },
 115	{ .center_freq = 2442, .hw_value = 7 },
 116	{ .center_freq = 2447, .hw_value = 8 },
 117	{ .center_freq = 2452, .hw_value = 9 },
 118	{ .center_freq = 2457, .hw_value = 10 },
 119	{ .center_freq = 2462, .hw_value = 11 },
 120	{ .center_freq = 2467, .hw_value = 12 },
 121	{ .center_freq = 2472, .hw_value = 13 },
 122	{ .center_freq = 2484, .hw_value = 14 },
 123};
 124
 125static void housekeeping_init(struct zd_mac *mac);
 126static void housekeeping_enable(struct zd_mac *mac);
 127static void housekeeping_disable(struct zd_mac *mac);
 128static void beacon_init(struct zd_mac *mac);
 129static void beacon_enable(struct zd_mac *mac);
 130static void beacon_disable(struct zd_mac *mac);
 131static void set_rts_cts(struct zd_mac *mac, unsigned int short_preamble);
 132static int zd_mac_config_beacon(struct ieee80211_hw *hw,
 133				struct sk_buff *beacon, bool in_intr);
 134
 135static int zd_reg2alpha2(u8 regdomain, char *alpha2)
 136{
 137	unsigned int i;
 138	struct zd_reg_alpha2_map *reg_map;
 139	for (i = 0; i < ARRAY_SIZE(reg_alpha2_map); i++) {
 140		reg_map = &reg_alpha2_map[i];
 141		if (regdomain == reg_map->reg) {
 142			alpha2[0] = reg_map->alpha2[0];
 143			alpha2[1] = reg_map->alpha2[1];
 144			return 0;
 145		}
 146	}
 147	return 1;
 148}
 149
 150static int zd_check_signal(struct ieee80211_hw *hw, int signal)
 151{
 152	struct zd_mac *mac = zd_hw_mac(hw);
 153
 154	dev_dbg_f_cond(zd_mac_dev(mac), signal < 0 || signal > 100,
 155			"%s: signal value from device not in range 0..100, "
 156			"but %d.\n", __func__, signal);
 157
 158	if (signal < 0)
 159		signal = 0;
 160	else if (signal > 100)
 161		signal = 100;
 162
 163	return signal;
 164}
 165
 166int zd_mac_preinit_hw(struct ieee80211_hw *hw)
 167{
 168	int r;
 169	u8 addr[ETH_ALEN];
 170	struct zd_mac *mac = zd_hw_mac(hw);
 171
 172	r = zd_chip_read_mac_addr_fw(&mac->chip, addr);
 173	if (r)
 174		return r;
 175
 176	SET_IEEE80211_PERM_ADDR(hw, addr);
 177
 178	return 0;
 179}
 180
 181int zd_mac_init_hw(struct ieee80211_hw *hw)
 182{
 183	int r;
 184	struct zd_mac *mac = zd_hw_mac(hw);
 185	struct zd_chip *chip = &mac->chip;
 186	char alpha2[2];
 187	u8 default_regdomain;
 188
 189	r = zd_chip_enable_int(chip);
 190	if (r)
 191		goto out;
 192	r = zd_chip_init_hw(chip);
 193	if (r)
 194		goto disable_int;
 195
 196	ZD_ASSERT(!irqs_disabled());
 197
 198	r = zd_read_regdomain(chip, &default_regdomain);
 199	if (r)
 200		goto disable_int;
 201	spin_lock_irq(&mac->lock);
 202	mac->regdomain = mac->default_regdomain = default_regdomain;
 203	spin_unlock_irq(&mac->lock);
 204
 205	/* We must inform the device that we are doing encryption/decryption in
 206	 * software at the moment. */
 207	r = zd_set_encryption_type(chip, ENC_SNIFFER);
 208	if (r)
 209		goto disable_int;
 210
 211	r = zd_reg2alpha2(mac->regdomain, alpha2);
 212	if (r)
 213		goto disable_int;
 214
 215	r = regulatory_hint(hw->wiphy, alpha2);
 216disable_int:
 217	zd_chip_disable_int(chip);
 218out:
 219	return r;
 220}
 221
 222void zd_mac_clear(struct zd_mac *mac)
 223{
 224	flush_workqueue(zd_workqueue);
 225	zd_chip_clear(&mac->chip);
 226	ZD_MEMCLEAR(mac, sizeof(struct zd_mac));
 227}
 228
 229static int set_rx_filter(struct zd_mac *mac)
 230{
 231	unsigned long flags;
 232	u32 filter = STA_RX_FILTER;
 233
 234	spin_lock_irqsave(&mac->lock, flags);
 235	if (mac->pass_ctrl)
 236		filter |= RX_FILTER_CTRL;
 237	spin_unlock_irqrestore(&mac->lock, flags);
 238
 239	return zd_iowrite32(&mac->chip, CR_RX_FILTER, filter);
 240}
 241
 242static int set_mac_and_bssid(struct zd_mac *mac)
 243{
 244	int r;
 245
 246	if (!mac->vif)
 247		return -1;
 248
 249	r = zd_write_mac_addr(&mac->chip, mac->vif->addr);
 250	if (r)
 251		return r;
 252
 253	/* Vendor driver after setting MAC either sets BSSID for AP or
 254	 * filter for other modes.
 255	 */
 256	if (mac->type != NL80211_IFTYPE_AP)
 257		return set_rx_filter(mac);
 258	else
 259		return zd_write_bssid(&mac->chip, mac->vif->addr);
 260}
 261
 262static int set_mc_hash(struct zd_mac *mac)
 263{
 264	struct zd_mc_hash hash;
 265	zd_mc_clear(&hash);
 266	return zd_chip_set_multicast_hash(&mac->chip, &hash);
 267}
 268
 269int zd_op_start(struct ieee80211_hw *hw)
 270{
 271	struct zd_mac *mac = zd_hw_mac(hw);
 272	struct zd_chip *chip = &mac->chip;
 273	struct zd_usb *usb = &chip->usb;
 274	int r;
 275
 276	if (!usb->initialized) {
 277		r = zd_usb_init_hw(usb);
 278		if (r)
 279			goto out;
 280	}
 281
 282	r = zd_chip_enable_int(chip);
 283	if (r < 0)
 284		goto out;
 285
 286	r = zd_chip_set_basic_rates(chip, CR_RATES_80211B | CR_RATES_80211G);
 287	if (r < 0)
 288		goto disable_int;
 289	r = set_rx_filter(mac);
 290	if (r)
 291		goto disable_int;
 292	r = set_mc_hash(mac);
 293	if (r)
 294		goto disable_int;
 295
 296	/* Wait after setting the multicast hash table and powering on
 297	 * the radio otherwise interface bring up will fail. This matches
 298	 * what the vendor driver did.
 299	 */
 300	msleep(10);
 301
 302	r = zd_chip_switch_radio_on(chip);
 303	if (r < 0) {
 304		dev_err(zd_chip_dev(chip),
 305			"%s: failed to set radio on\n", __func__);
 306		goto disable_int;
 307	}
 308	r = zd_chip_enable_rxtx(chip);
 309	if (r < 0)
 310		goto disable_radio;
 311	r = zd_chip_enable_hwint(chip);
 312	if (r < 0)
 313		goto disable_rxtx;
 314
 315	housekeeping_enable(mac);
 316	beacon_enable(mac);
 317	set_bit(ZD_DEVICE_RUNNING, &mac->flags);
 318	return 0;
 319disable_rxtx:
 320	zd_chip_disable_rxtx(chip);
 321disable_radio:
 322	zd_chip_switch_radio_off(chip);
 323disable_int:
 324	zd_chip_disable_int(chip);
 325out:
 326	return r;
 327}
 328
 329void zd_op_stop(struct ieee80211_hw *hw, bool suspend)
 330{
 331	struct zd_mac *mac = zd_hw_mac(hw);
 332	struct zd_chip *chip = &mac->chip;
 333	struct sk_buff *skb;
 334	struct sk_buff_head *ack_wait_queue = &mac->ack_wait_queue;
 335
 336	clear_bit(ZD_DEVICE_RUNNING, &mac->flags);
 337
 338	/* The order here deliberately is a little different from the open()
 339	 * method, since we need to make sure there is no opportunity for RX
 340	 * frames to be processed by mac80211 after we have stopped it.
 341	 */
 342
 343	zd_chip_disable_rxtx(chip);
 344	beacon_disable(mac);
 345	housekeeping_disable(mac);
 346	flush_workqueue(zd_workqueue);
 347
 348	zd_chip_disable_hwint(chip);
 349	zd_chip_switch_radio_off(chip);
 350	zd_chip_disable_int(chip);
 351
 352
 353	while ((skb = skb_dequeue(ack_wait_queue)))
 354		dev_kfree_skb_any(skb);
 355}
 356
 357int zd_restore_settings(struct zd_mac *mac)
 358{
 359	struct sk_buff *beacon;
 360	struct zd_mc_hash multicast_hash;
 361	unsigned int short_preamble;
 362	int r, beacon_interval, beacon_period;
 363	u8 channel;
 364
 365	dev_dbg_f(zd_mac_dev(mac), "\n");
 366
 367	spin_lock_irq(&mac->lock);
 368	multicast_hash = mac->multicast_hash;
 369	short_preamble = mac->short_preamble;
 370	beacon_interval = mac->beacon.interval;
 371	beacon_period = mac->beacon.period;
 372	channel = mac->channel;
 373	spin_unlock_irq(&mac->lock);
 374
 375	r = set_mac_and_bssid(mac);
 376	if (r < 0) {
 377		dev_dbg_f(zd_mac_dev(mac), "set_mac_and_bssid failed, %d\n", r);
 378		return r;
 379	}
 380
 381	r = zd_chip_set_channel(&mac->chip, channel);
 382	if (r < 0) {
 383		dev_dbg_f(zd_mac_dev(mac), "zd_chip_set_channel failed, %d\n",
 384			  r);
 385		return r;
 386	}
 387
 388	set_rts_cts(mac, short_preamble);
 389
 390	r = zd_chip_set_multicast_hash(&mac->chip, &multicast_hash);
 391	if (r < 0) {
 392		dev_dbg_f(zd_mac_dev(mac),
 393			  "zd_chip_set_multicast_hash failed, %d\n", r);
 394		return r;
 395	}
 396
 397	if (mac->type == NL80211_IFTYPE_MESH_POINT ||
 398	    mac->type == NL80211_IFTYPE_ADHOC ||
 399	    mac->type == NL80211_IFTYPE_AP) {
 400		if (mac->vif != NULL) {
 401			beacon = ieee80211_beacon_get(mac->hw, mac->vif, 0);
 402			if (beacon)
 403				zd_mac_config_beacon(mac->hw, beacon, false);
 404		}
 405
 406		zd_set_beacon_interval(&mac->chip, beacon_interval,
 407					beacon_period, mac->type);
 408
 409		spin_lock_irq(&mac->lock);
 410		mac->beacon.last_update = jiffies;
 411		spin_unlock_irq(&mac->lock);
 412	}
 413
 414	return 0;
 415}
 416
 417/**
 418 * zd_mac_tx_status - reports tx status of a packet if required
 419 * @hw: a &struct ieee80211_hw pointer
 420 * @skb: a sk-buffer
 421 * @ackssi: ACK signal strength
 422 * @tx_status: success and/or retry
 423 *
 424 * This information calls ieee80211_tx_status_irqsafe() if required by the
 425 * control information. It copies the control information into the status
 426 * information.
 427 *
 428 * If no status information has been requested, the skb is freed.
 429 */
 430static void zd_mac_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 431		      int ackssi, struct tx_status *tx_status)
 432{
 433	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 434	int i;
 435	int success = 1, retry = 1;
 436	int first_idx;
 437	const struct tx_retry_rate *retries;
 438
 439	ieee80211_tx_info_clear_status(info);
 440
 441	if (tx_status) {
 442		success = !tx_status->failure;
 443		retry = tx_status->retry + success;
 444	}
 445
 446	if (success) {
 447		/* success */
 448		info->flags |= IEEE80211_TX_STAT_ACK;
 449	} else {
 450		/* failure */
 451		info->flags &= ~IEEE80211_TX_STAT_ACK;
 452	}
 453
 454	first_idx = info->status.rates[0].idx;
 455	ZD_ASSERT(0<=first_idx && first_idx<ARRAY_SIZE(zd_retry_rates));
 456	retries = &zd_retry_rates[first_idx];
 457	ZD_ASSERT(1 <= retry && retry <= retries->count);
 458
 459	info->status.rates[0].idx = retries->rate[0];
 460	info->status.rates[0].count = 1; // (retry > 1 ? 2 : 1);
 461
 462	for (i=1; i<IEEE80211_TX_MAX_RATES-1 && i<retry; i++) {
 463		info->status.rates[i].idx = retries->rate[i];
 464		info->status.rates[i].count = 1; // ((i==retry-1) && success ? 1:2);
 465	}
 466	for (; i<IEEE80211_TX_MAX_RATES && i<retry; i++) {
 467		info->status.rates[i].idx = retries->rate[retry - 1];
 468		info->status.rates[i].count = 1; // (success ? 1:2);
 469	}
 470	if (i<IEEE80211_TX_MAX_RATES)
 471		info->status.rates[i].idx = -1; /* terminate */
 472
 473	info->status.ack_signal = zd_check_signal(hw, ackssi);
 474	ieee80211_tx_status_irqsafe(hw, skb);
 475}
 476
 477/**
 478 * zd_mac_tx_failed - callback for failed frames
 479 * @urb: pointer to the urb structure
 480 *
 481 * This function is called if a frame couldn't be successfully
 482 * transferred. The first frame from the tx queue, will be selected and
 483 * reported as error to the upper layers.
 484 */
 485void zd_mac_tx_failed(struct urb *urb)
 486{
 487	struct ieee80211_hw * hw = zd_usb_to_hw(urb->context);
 488	struct zd_mac *mac = zd_hw_mac(hw);
 489	struct sk_buff_head *q = &mac->ack_wait_queue;
 490	struct sk_buff *skb;
 491	struct tx_status *tx_status = (struct tx_status *)urb->transfer_buffer;
 492	unsigned long flags;
 493	int success = !tx_status->failure;
 494	int retry = tx_status->retry + success;
 495	int found = 0;
 496	int i, position = 0;
 497
 498	spin_lock_irqsave(&q->lock, flags);
 499
 500	skb_queue_walk(q, skb) {
 501		struct ieee80211_hdr *tx_hdr;
 502		struct ieee80211_tx_info *info;
 503		int first_idx, final_idx;
 504		const struct tx_retry_rate *retries;
 505		u8 final_rate;
 506
 507		position ++;
 508
 509		/* if the hardware reports a failure and we had a 802.11 ACK
 510		 * pending, then we skip the first skb when searching for a
 511		 * matching frame */
 512		if (tx_status->failure && mac->ack_pending &&
 513		    skb_queue_is_first(q, skb)) {
 514			continue;
 515		}
 516
 517		tx_hdr = (struct ieee80211_hdr *)skb->data;
 518
 519		/* we skip all frames not matching the reported destination */
 520		if (unlikely(!ether_addr_equal(tx_hdr->addr1, tx_status->mac)))
 521			continue;
 522
 523		/* we skip all frames not matching the reported final rate */
 524
 525		info = IEEE80211_SKB_CB(skb);
 526		first_idx = info->status.rates[0].idx;
 527		ZD_ASSERT(0<=first_idx && first_idx<ARRAY_SIZE(zd_retry_rates));
 528		retries = &zd_retry_rates[first_idx];
 529		if (retry <= 0 || retry > retries->count)
 530			continue;
 531
 532		final_idx = retries->rate[retry - 1];
 533		final_rate = zd_rates[final_idx].hw_value;
 534
 535		if (final_rate != tx_status->rate) {
 536			continue;
 537		}
 538
 539		found = 1;
 540		break;
 541	}
 542
 543	if (found) {
 544		for (i=1; i<=position; i++) {
 545			skb = __skb_dequeue(q);
 546			zd_mac_tx_status(hw, skb,
 547					 mac->ack_pending ? mac->ack_signal : 0,
 548					 i == position ? tx_status : NULL);
 549			mac->ack_pending = 0;
 550		}
 551	}
 552
 553	spin_unlock_irqrestore(&q->lock, flags);
 554}
 555
 556/**
 557 * zd_mac_tx_to_dev - callback for USB layer
 558 * @skb: a &sk_buff pointer
 559 * @error: error value, 0 if transmission successful
 560 *
 561 * Informs the MAC layer that the frame has successfully transferred to the
 562 * device. If an ACK is required and the transfer to the device has been
 563 * successful, the packets are put on the @ack_wait_queue with
 564 * the control set removed.
 565 */
 566void zd_mac_tx_to_dev(struct sk_buff *skb, int error)
 567{
 568	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 569	struct ieee80211_hw *hw = info->rate_driver_data[0];
 570	struct zd_mac *mac = zd_hw_mac(hw);
 571
 572	ieee80211_tx_info_clear_status(info);
 573
 574	skb_pull(skb, sizeof(struct zd_ctrlset));
 575	if (unlikely(error ||
 576	    (info->flags & IEEE80211_TX_CTL_NO_ACK))) {
 577		/*
 578		 * FIXME : do we need to fill in anything ?
 579		 */
 580		ieee80211_tx_status_irqsafe(hw, skb);
 581	} else {
 582		struct sk_buff_head *q = &mac->ack_wait_queue;
 583
 584		skb_queue_tail(q, skb);
 585		while (skb_queue_len(q) > ZD_MAC_MAX_ACK_WAITERS) {
 586			skb = skb_dequeue(q);
 587			if (!skb)
 588				break;
 589
 590			zd_mac_tx_status(hw, skb,
 591					 mac->ack_pending ? mac->ack_signal : 0,
 592					 NULL);
 593			mac->ack_pending = 0;
 594		}
 595	}
 596}
 597
 598static int zd_calc_tx_length_us(u8 *service, u8 zd_rate, u16 tx_length)
 599{
 600	/* ZD_PURE_RATE() must be used to remove the modulation type flag of
 601	 * the zd-rate values.
 602	 */
 603	static const u8 rate_divisor[] = {
 604		[ZD_PURE_RATE(ZD_CCK_RATE_1M)]   =  1,
 605		[ZD_PURE_RATE(ZD_CCK_RATE_2M)]	 =  2,
 606		/* Bits must be doubled. */
 607		[ZD_PURE_RATE(ZD_CCK_RATE_5_5M)] = 11,
 608		[ZD_PURE_RATE(ZD_CCK_RATE_11M)]	 = 11,
 609		[ZD_PURE_RATE(ZD_OFDM_RATE_6M)]  =  6,
 610		[ZD_PURE_RATE(ZD_OFDM_RATE_9M)]  =  9,
 611		[ZD_PURE_RATE(ZD_OFDM_RATE_12M)] = 12,
 612		[ZD_PURE_RATE(ZD_OFDM_RATE_18M)] = 18,
 613		[ZD_PURE_RATE(ZD_OFDM_RATE_24M)] = 24,
 614		[ZD_PURE_RATE(ZD_OFDM_RATE_36M)] = 36,
 615		[ZD_PURE_RATE(ZD_OFDM_RATE_48M)] = 48,
 616		[ZD_PURE_RATE(ZD_OFDM_RATE_54M)] = 54,
 617	};
 618
 619	u32 bits = (u32)tx_length * 8;
 620	u32 divisor;
 621
 622	divisor = rate_divisor[ZD_PURE_RATE(zd_rate)];
 623	if (divisor == 0)
 624		return -EINVAL;
 625
 626	switch (zd_rate) {
 627	case ZD_CCK_RATE_5_5M:
 628		bits = (2*bits) + 10; /* round up to the next integer */
 629		break;
 630	case ZD_CCK_RATE_11M:
 631		if (service) {
 632			u32 t = bits % 11;
 633			*service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 634			if (0 < t && t <= 3) {
 635				*service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 636			}
 637		}
 638		bits += 10; /* round up to the next integer */
 639		break;
 640	}
 641
 642	return bits/divisor;
 643}
 644
 645static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
 646	                   struct ieee80211_hdr *header,
 647	                   struct ieee80211_tx_info *info)
 648{
 649	/*
 650	 * CONTROL TODO:
 651	 * - if backoff needed, enable bit 0
 652	 * - if burst (backoff not needed) disable bit 0
 653	 */
 654
 655	cs->control = 0;
 656
 657	/* First fragment */
 658	if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
 659		cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
 660
 661	/* No ACK expected (multicast, etc.) */
 662	if (info->flags & IEEE80211_TX_CTL_NO_ACK)
 663		cs->control |= ZD_CS_NO_ACK;
 664
 665	/* PS-POLL */
 666	if (ieee80211_is_pspoll(header->frame_control))
 667		cs->control |= ZD_CS_PS_POLL_FRAME;
 668
 669	if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 670		cs->control |= ZD_CS_RTS;
 671
 672	if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 673		cs->control |= ZD_CS_SELF_CTS;
 674
 675	/* FIXME: Management frame? */
 676}
 677
 678static bool zd_mac_match_cur_beacon(struct zd_mac *mac, struct sk_buff *beacon)
 679{
 680	if (!mac->beacon.cur_beacon)
 681		return false;
 682
 683	if (mac->beacon.cur_beacon->len != beacon->len)
 684		return false;
 685
 686	return !memcmp(beacon->data, mac->beacon.cur_beacon->data, beacon->len);
 687}
 688
 689static void zd_mac_free_cur_beacon_locked(struct zd_mac *mac)
 690{
 691	ZD_ASSERT(mutex_is_locked(&mac->chip.mutex));
 692
 693	kfree_skb(mac->beacon.cur_beacon);
 694	mac->beacon.cur_beacon = NULL;
 695}
 696
 697static void zd_mac_free_cur_beacon(struct zd_mac *mac)
 698{
 699	mutex_lock(&mac->chip.mutex);
 700	zd_mac_free_cur_beacon_locked(mac);
 701	mutex_unlock(&mac->chip.mutex);
 702}
 703
 704static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon,
 705				bool in_intr)
 706{
 707	struct zd_mac *mac = zd_hw_mac(hw);
 708	int r, ret, num_cmds, req_pos = 0;
 709	u32 tmp, j = 0;
 710	/* 4 more bytes for tail CRC */
 711	u32 full_len = beacon->len + 4;
 712	unsigned long end_jiffies, message_jiffies;
 713	struct zd_ioreq32 *ioreqs;
 714
 715	mutex_lock(&mac->chip.mutex);
 716
 717	/* Check if hw already has this beacon. */
 718	if (zd_mac_match_cur_beacon(mac, beacon)) {
 719		r = 0;
 720		goto out_nofree;
 721	}
 722
 723	/* Alloc memory for full beacon write at once. */
 724	num_cmds = 1 + zd_chip_is_zd1211b(&mac->chip) + full_len;
 725	ioreqs = kmalloc_array(num_cmds, sizeof(struct zd_ioreq32),
 726			       GFP_KERNEL);
 727	if (!ioreqs) {
 728		r = -ENOMEM;
 729		goto out_nofree;
 730	}
 731
 732	r = zd_iowrite32_locked(&mac->chip, 0, CR_BCN_FIFO_SEMAPHORE);
 733	if (r < 0)
 734		goto out;
 735	r = zd_ioread32_locked(&mac->chip, &tmp, CR_BCN_FIFO_SEMAPHORE);
 736	if (r < 0)
 737		goto release_sema;
 738	if (in_intr && tmp & 0x2) {
 739		r = -EBUSY;
 740		goto release_sema;
 741	}
 742
 743	end_jiffies = jiffies + HZ / 2; /*~500ms*/
 744	message_jiffies = jiffies + HZ / 10; /*~100ms*/
 745	while (tmp & 0x2) {
 746		r = zd_ioread32_locked(&mac->chip, &tmp, CR_BCN_FIFO_SEMAPHORE);
 747		if (r < 0)
 748			goto release_sema;
 749		if (time_is_before_eq_jiffies(message_jiffies)) {
 750			message_jiffies = jiffies + HZ / 10;
 751			dev_err(zd_mac_dev(mac),
 752					"CR_BCN_FIFO_SEMAPHORE not ready\n");
 753			if (time_is_before_eq_jiffies(end_jiffies))  {
 754				dev_err(zd_mac_dev(mac),
 755						"Giving up beacon config.\n");
 756				r = -ETIMEDOUT;
 757				goto reset_device;
 758			}
 759		}
 760		msleep(20);
 761	}
 762
 763	ioreqs[req_pos].addr = CR_BCN_FIFO;
 764	ioreqs[req_pos].value = full_len - 1;
 765	req_pos++;
 766	if (zd_chip_is_zd1211b(&mac->chip)) {
 767		ioreqs[req_pos].addr = CR_BCN_LENGTH;
 768		ioreqs[req_pos].value = full_len - 1;
 769		req_pos++;
 770	}
 771
 772	for (j = 0 ; j < beacon->len; j++) {
 773		ioreqs[req_pos].addr = CR_BCN_FIFO;
 774		ioreqs[req_pos].value = *((u8 *)(beacon->data + j));
 775		req_pos++;
 776	}
 777
 778	for (j = 0; j < 4; j++) {
 779		ioreqs[req_pos].addr = CR_BCN_FIFO;
 780		ioreqs[req_pos].value = 0x0;
 781		req_pos++;
 782	}
 783
 784	BUG_ON(req_pos != num_cmds);
 785
 786	r = zd_iowrite32a_locked(&mac->chip, ioreqs, num_cmds);
 787
 788release_sema:
 789	/*
 790	 * Try very hard to release device beacon semaphore, as otherwise
 791	 * device/driver can be left in unusable state.
 792	 */
 793	end_jiffies = jiffies + HZ / 2; /*~500ms*/
 794	ret = zd_iowrite32_locked(&mac->chip, 1, CR_BCN_FIFO_SEMAPHORE);
 795	while (ret < 0) {
 796		if (in_intr || time_is_before_eq_jiffies(end_jiffies)) {
 797			ret = -ETIMEDOUT;
 798			break;
 799		}
 800
 801		msleep(20);
 802		ret = zd_iowrite32_locked(&mac->chip, 1, CR_BCN_FIFO_SEMAPHORE);
 803	}
 804
 805	if (ret < 0)
 806		dev_err(zd_mac_dev(mac), "Could not release "
 807					 "CR_BCN_FIFO_SEMAPHORE!\n");
 808	if (r < 0 || ret < 0) {
 809		if (r >= 0)
 810			r = ret;
 811
 812		/* We don't know if beacon was written successfully or not,
 813		 * so clear current. */
 814		zd_mac_free_cur_beacon_locked(mac);
 815
 816		goto out;
 817	}
 818
 819	/* Beacon has now been written successfully, update current. */
 820	zd_mac_free_cur_beacon_locked(mac);
 821	mac->beacon.cur_beacon = beacon;
 822	beacon = NULL;
 823
 824	/* 802.11b/g 2.4G CCK 1Mb
 825	 * 802.11a, not yet implemented, uses different values (see GPL vendor
 826	 * driver)
 827	 */
 828	r = zd_iowrite32_locked(&mac->chip, 0x00000400 | (full_len << 19),
 829				CR_BCN_PLCP_CFG);
 830out:
 831	kfree(ioreqs);
 832out_nofree:
 833	kfree_skb(beacon);
 834	mutex_unlock(&mac->chip.mutex);
 835
 836	return r;
 837
 838reset_device:
 839	zd_mac_free_cur_beacon_locked(mac);
 840	kfree_skb(beacon);
 841
 842	mutex_unlock(&mac->chip.mutex);
 843	kfree(ioreqs);
 844
 845	/* semaphore stuck, reset device to avoid fw freeze later */
 846	dev_warn(zd_mac_dev(mac), "CR_BCN_FIFO_SEMAPHORE stuck, "
 847				  "resetting device...");
 848	usb_queue_reset_device(mac->chip.usb.intf);
 849
 850	return r;
 851}
 852
 853static int fill_ctrlset(struct zd_mac *mac,
 854			struct sk_buff *skb)
 855{
 856	int r;
 857	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 858	unsigned int frag_len = skb->len + FCS_LEN;
 859	unsigned int packet_length;
 860	struct ieee80211_rate *txrate;
 861	struct zd_ctrlset *cs = skb_push(skb, sizeof(struct zd_ctrlset));
 862	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 863
 864	ZD_ASSERT(frag_len <= 0xffff);
 865
 866	/*
 867	 * Firmware computes the duration itself (for all frames except PSPoll)
 868	 * and needs the field set to 0 at input, otherwise firmware messes up
 869	 * duration_id and sets bits 14 and 15 on.
 870	 */
 871	if (!ieee80211_is_pspoll(hdr->frame_control))
 872		hdr->duration_id = 0;
 873
 874	txrate = ieee80211_get_tx_rate(mac->hw, info);
 875
 876	cs->modulation = txrate->hw_value;
 877	if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 878		cs->modulation = txrate->hw_value_short;
 879
 880	cs->tx_length = cpu_to_le16(frag_len);
 881
 882	cs_set_control(mac, cs, hdr, info);
 883
 884	packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
 885	ZD_ASSERT(packet_length <= 0xffff);
 886	/* ZD1211B: Computing the length difference this way, gives us
 887	 * flexibility to compute the packet length.
 888	 */
 889	cs->packet_length = cpu_to_le16(zd_chip_is_zd1211b(&mac->chip) ?
 890			packet_length - frag_len : packet_length);
 891
 892	/*
 893	 * CURRENT LENGTH:
 894	 * - transmit frame length in microseconds
 895	 * - seems to be derived from frame length
 896	 * - see Cal_Us_Service() in zdinlinef.h
 897	 * - if macp->bTxBurstEnable is enabled, then multiply by 4
 898	 *  - bTxBurstEnable is never set in the vendor driver
 899	 *
 900	 * SERVICE:
 901	 * - "for PLCP configuration"
 902	 * - always 0 except in some situations at 802.11b 11M
 903	 * - see line 53 of zdinlinef.h
 904	 */
 905	cs->service = 0;
 906	r = zd_calc_tx_length_us(&cs->service, ZD_RATE(cs->modulation),
 907		                 le16_to_cpu(cs->tx_length));
 908	if (r < 0)
 909		return r;
 910	cs->current_length = cpu_to_le16(r);
 911	cs->next_frame_length = 0;
 912
 913	return 0;
 914}
 915
 916/**
 917 * zd_op_tx - transmits a network frame to the device
 918 *
 919 * @hw: a &struct ieee80211_hw pointer
 920 * @control: the control structure
 921 * @skb: socket buffer
 922 *
 923 * This function transmit an IEEE 802.11 network frame to the device. The
 924 * control block of the skbuff will be initialized. If necessary the incoming
 925 * mac80211 queues will be stopped.
 926 */
 927static void zd_op_tx(struct ieee80211_hw *hw,
 928		     struct ieee80211_tx_control *control,
 929		     struct sk_buff *skb)
 930{
 931	struct zd_mac *mac = zd_hw_mac(hw);
 932	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 933	int r;
 934
 935	r = fill_ctrlset(mac, skb);
 936	if (r)
 937		goto fail;
 938
 939	info->rate_driver_data[0] = hw;
 940
 941	r = zd_usb_tx(&mac->chip.usb, skb);
 942	if (r)
 943		goto fail;
 944	return;
 945
 946fail:
 947	dev_kfree_skb(skb);
 948}
 949
 950/**
 951 * filter_ack - filters incoming packets for acknowledgements
 952 * @hw: a &struct ieee80211_hw pointer
 953 * @rx_hdr: received header
 954 * @stats: the status for the received packet
 955 *
 956 * This functions looks for ACK packets and tries to match them with the
 957 * frames in the tx queue. If a match is found the frame will be dequeued and
 958 * the upper layers is informed about the successful transmission. If
 959 * mac80211 queues have been stopped and the number of frames still to be
 960 * transmitted is low the queues will be opened again.
 961 *
 962 * Returns 1 if the frame was an ACK, 0 if it was ignored.
 963 */
 964static int filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr,
 965		      struct ieee80211_rx_status *stats)
 966{
 967	struct zd_mac *mac = zd_hw_mac(hw);
 968	struct sk_buff *skb;
 969	struct sk_buff_head *q;
 970	unsigned long flags;
 971	int found = 0;
 972	int i, position = 0;
 973
 974	if (!ieee80211_is_ack(rx_hdr->frame_control))
 975		return 0;
 976
 977	q = &mac->ack_wait_queue;
 978	spin_lock_irqsave(&q->lock, flags);
 979	skb_queue_walk(q, skb) {
 980		struct ieee80211_hdr *tx_hdr;
 981
 982		position ++;
 983
 984		if (mac->ack_pending && skb_queue_is_first(q, skb))
 985		    continue;
 986
 987		tx_hdr = (struct ieee80211_hdr *)skb->data;
 988		if (likely(ether_addr_equal(tx_hdr->addr2, rx_hdr->addr1)))
 989		{
 990			found = 1;
 991			break;
 992		}
 993	}
 994
 995	if (found) {
 996		for (i=1; i<position; i++) {
 997			skb = __skb_dequeue(q);
 998			zd_mac_tx_status(hw, skb,
 999					 mac->ack_pending ? mac->ack_signal : 0,
1000					 NULL);
1001			mac->ack_pending = 0;
1002		}
1003
1004		mac->ack_pending = 1;
1005		mac->ack_signal = stats->signal;
1006
1007		/* Prevent pending tx-packet on AP-mode */
1008		if (mac->type == NL80211_IFTYPE_AP) {
1009			skb = __skb_dequeue(q);
1010			zd_mac_tx_status(hw, skb, mac->ack_signal, NULL);
1011			mac->ack_pending = 0;
1012		}
1013	}
1014
1015	spin_unlock_irqrestore(&q->lock, flags);
1016	return 1;
1017}
1018
1019int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length)
1020{
1021	struct zd_mac *mac = zd_hw_mac(hw);
1022	struct ieee80211_rx_status stats;
1023	const struct rx_status *status;
1024	struct sk_buff *skb;
1025	int bad_frame = 0;
1026	__le16 fc;
1027	int need_padding;
1028	int i;
1029	u8 rate;
1030
1031	if (length < ZD_PLCP_HEADER_SIZE + 10 /* IEEE80211_1ADDR_LEN */ +
1032	             FCS_LEN + sizeof(struct rx_status))
1033		return -EINVAL;
1034
1035	memset(&stats, 0, sizeof(stats));
1036
1037	/* Note about pass_failed_fcs and pass_ctrl access below:
1038	 * mac locking intentionally omitted here, as this is the only unlocked
1039	 * reader and the only writer is configure_filter. Plus, if there were
1040	 * any races accessing these variables, it wouldn't really matter.
1041	 * If mac80211 ever provides a way for us to access filter flags
1042	 * from outside configure_filter, we could improve on this. Also, this
1043	 * situation may change once we implement some kind of DMA-into-skb
1044	 * RX path. */
1045
1046	/* Caller has to ensure that length >= sizeof(struct rx_status). */
1047	status = (struct rx_status *)
1048		(buffer + (length - sizeof(struct rx_status)));
1049	if (status->frame_status & ZD_RX_ERROR) {
1050		if (mac->pass_failed_fcs &&
1051				(status->frame_status & ZD_RX_CRC32_ERROR)) {
1052			stats.flag |= RX_FLAG_FAILED_FCS_CRC;
1053			bad_frame = 1;
1054		} else {
1055			return -EINVAL;
1056		}
1057	}
1058
1059	stats.freq = zd_channels[_zd_chip_get_channel(&mac->chip) - 1].center_freq;
1060	stats.band = NL80211_BAND_2GHZ;
1061	stats.signal = zd_check_signal(hw, status->signal_strength);
1062
1063	rate = zd_rx_rate(buffer, status);
1064
1065	/* todo: return index in the big switches in zd_rx_rate instead */
1066	for (i = 0; i < mac->band.n_bitrates; i++)
1067		if (rate == mac->band.bitrates[i].hw_value)
1068			stats.rate_idx = i;
1069
1070	length -= ZD_PLCP_HEADER_SIZE + sizeof(struct rx_status);
1071	buffer += ZD_PLCP_HEADER_SIZE;
1072
1073	/* Except for bad frames, filter each frame to see if it is an ACK, in
1074	 * which case our internal TX tracking is updated. Normally we then
1075	 * bail here as there's no need to pass ACKs on up to the stack, but
1076	 * there is also the case where the stack has requested us to pass
1077	 * control frames on up (pass_ctrl) which we must consider. */
1078	if (!bad_frame &&
1079			filter_ack(hw, (struct ieee80211_hdr *)buffer, &stats)
1080			&& !mac->pass_ctrl)
1081		return 0;
1082
1083	fc = get_unaligned((__le16*)buffer);
1084	need_padding = ieee80211_is_data_qos(fc) ^ ieee80211_has_a4(fc);
1085
1086	skb = dev_alloc_skb(length + (need_padding ? 2 : 0));
1087	if (skb == NULL)
1088		return -ENOMEM;
1089	if (need_padding) {
1090		/* Make sure the payload data is 4 byte aligned. */
1091		skb_reserve(skb, 2);
1092	}
1093
1094	/* FIXME : could we avoid this big memcpy ? */
1095	skb_put_data(skb, buffer, length);
1096
1097	memcpy(IEEE80211_SKB_RXCB(skb), &stats, sizeof(stats));
1098	ieee80211_rx_irqsafe(hw, skb);
1099	return 0;
1100}
1101
1102static int zd_op_add_interface(struct ieee80211_hw *hw,
1103				struct ieee80211_vif *vif)
1104{
1105	struct zd_mac *mac = zd_hw_mac(hw);
1106
1107	/* using NL80211_IFTYPE_UNSPECIFIED to indicate no mode selected */
1108	if (mac->type != NL80211_IFTYPE_UNSPECIFIED)
1109		return -EOPNOTSUPP;
1110
1111	switch (vif->type) {
1112	case NL80211_IFTYPE_MONITOR:
1113	case NL80211_IFTYPE_MESH_POINT:
1114	case NL80211_IFTYPE_STATION:
1115	case NL80211_IFTYPE_ADHOC:
1116	case NL80211_IFTYPE_AP:
1117		mac->type = vif->type;
1118		break;
1119	default:
1120		return -EOPNOTSUPP;
1121	}
1122
1123	mac->vif = vif;
1124
1125	return set_mac_and_bssid(mac);
1126}
1127
1128static void zd_op_remove_interface(struct ieee80211_hw *hw,
1129				    struct ieee80211_vif *vif)
1130{
1131	struct zd_mac *mac = zd_hw_mac(hw);
1132	mac->type = NL80211_IFTYPE_UNSPECIFIED;
1133	mac->vif = NULL;
1134	zd_set_beacon_interval(&mac->chip, 0, 0, NL80211_IFTYPE_UNSPECIFIED);
1135	zd_write_mac_addr(&mac->chip, NULL);
1136
1137	zd_mac_free_cur_beacon(mac);
1138}
1139
1140static int zd_op_config(struct ieee80211_hw *hw, int radio_idx, u32 changed)
1141{
1142	struct zd_mac *mac = zd_hw_mac(hw);
1143	struct ieee80211_conf *conf = &hw->conf;
1144
1145	spin_lock_irq(&mac->lock);
1146	mac->channel = conf->chandef.chan->hw_value;
1147	spin_unlock_irq(&mac->lock);
1148
1149	return zd_chip_set_channel(&mac->chip, conf->chandef.chan->hw_value);
1150}
1151
1152static void zd_beacon_done(struct zd_mac *mac)
1153{
1154	struct sk_buff *skb, *beacon;
1155
1156	if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1157		return;
1158	if (!mac->vif || mac->vif->type != NL80211_IFTYPE_AP)
1159		return;
1160
1161	/*
1162	 * Send out buffered broad- and multicast frames.
1163	 */
1164	while (!ieee80211_queue_stopped(mac->hw, 0)) {
1165		skb = ieee80211_get_buffered_bc(mac->hw, mac->vif);
1166		if (!skb)
1167			break;
1168		zd_op_tx(mac->hw, NULL, skb);
1169	}
1170
1171	/*
1172	 * Fetch next beacon so that tim_count is updated.
1173	 */
1174	beacon = ieee80211_beacon_get(mac->hw, mac->vif, 0);
1175	if (beacon)
1176		zd_mac_config_beacon(mac->hw, beacon, true);
1177
1178	spin_lock_irq(&mac->lock);
1179	mac->beacon.last_update = jiffies;
1180	spin_unlock_irq(&mac->lock);
1181}
1182
1183static void zd_process_intr(struct work_struct *work)
1184{
1185	u16 int_status;
1186	unsigned long flags;
1187	struct zd_mac *mac = container_of(work, struct zd_mac, process_intr);
1188
1189	spin_lock_irqsave(&mac->lock, flags);
1190	int_status = le16_to_cpu(*(__le16 *)(mac->intr_buffer + 4));
1191	spin_unlock_irqrestore(&mac->lock, flags);
1192
1193	if (int_status & INT_CFG_NEXT_BCN) {
1194		/*dev_dbg_f_limit(zd_mac_dev(mac), "INT_CFG_NEXT_BCN\n");*/
1195		zd_beacon_done(mac);
1196	} else {
1197		dev_dbg_f(zd_mac_dev(mac), "Unsupported interrupt\n");
1198	}
1199
1200	zd_chip_enable_hwint(&mac->chip);
1201}
1202
1203
1204static u64 zd_op_prepare_multicast(struct ieee80211_hw *hw,
1205				   struct netdev_hw_addr_list *mc_list)
1206{
1207	struct zd_mac *mac = zd_hw_mac(hw);
1208	struct zd_mc_hash hash;
1209	struct netdev_hw_addr *ha;
1210
1211	zd_mc_clear(&hash);
1212
1213	netdev_hw_addr_list_for_each(ha, mc_list) {
1214		dev_dbg_f(zd_mac_dev(mac), "mc addr %pM\n", ha->addr);
1215		zd_mc_add_addr(&hash, ha->addr);
1216	}
1217
1218	return hash.low | ((u64)hash.high << 32);
1219}
1220
1221#define SUPPORTED_FIF_FLAGS \
1222	(FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \
1223	FIF_OTHER_BSS | FIF_BCN_PRBRESP_PROMISC)
1224static void zd_op_configure_filter(struct ieee80211_hw *hw,
1225			unsigned int changed_flags,
1226			unsigned int *new_flags,
1227			u64 multicast)
1228{
1229	struct zd_mc_hash hash = {
1230		.low = multicast,
1231		.high = multicast >> 32,
1232	};
1233	struct zd_mac *mac = zd_hw_mac(hw);
1234	unsigned long flags;
1235	int r;
1236
1237	/* Only deal with supported flags */
1238	changed_flags &= SUPPORTED_FIF_FLAGS;
1239	*new_flags &= SUPPORTED_FIF_FLAGS;
1240
1241	/*
1242	 * If multicast parameter (as returned by zd_op_prepare_multicast)
1243	 * has changed, no bit in changed_flags is set. To handle this
1244	 * situation, we do not return if changed_flags is 0. If we do so,
1245	 * we will have some issue with IPv6 which uses multicast for link
1246	 * layer address resolution.
1247	 */
1248	if (*new_flags & FIF_ALLMULTI)
1249		zd_mc_add_all(&hash);
1250
1251	spin_lock_irqsave(&mac->lock, flags);
1252	mac->pass_failed_fcs = !!(*new_flags & FIF_FCSFAIL);
1253	mac->pass_ctrl = !!(*new_flags & FIF_CONTROL);
1254	mac->multicast_hash = hash;
1255	spin_unlock_irqrestore(&mac->lock, flags);
1256
1257	zd_chip_set_multicast_hash(&mac->chip, &hash);
1258
1259	if (changed_flags & FIF_CONTROL) {
1260		r = set_rx_filter(mac);
1261		if (r)
1262			dev_err(zd_mac_dev(mac), "set_rx_filter error %d\n", r);
1263	}
1264
1265	/* no handling required for FIF_OTHER_BSS as we don't currently
1266	 * do BSSID filtering */
1267	/* FIXME: in future it would be nice to enable the probe response
1268	 * filter (so that the driver doesn't see them) until
1269	 * FIF_BCN_PRBRESP_PROMISC is set. however due to atomicity here, we'd
1270	 * have to schedule work to enable prbresp reception, which might
1271	 * happen too late. For now we'll just listen and forward them all the
1272	 * time. */
1273}
1274
1275static void set_rts_cts(struct zd_mac *mac, unsigned int short_preamble)
1276{
1277	mutex_lock(&mac->chip.mutex);
1278	zd_chip_set_rts_cts_rate_locked(&mac->chip, short_preamble);
1279	mutex_unlock(&mac->chip.mutex);
1280}
1281
1282static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
1283				   struct ieee80211_vif *vif,
1284				   struct ieee80211_bss_conf *bss_conf,
1285				   u64 changes)
1286{
1287	struct zd_mac *mac = zd_hw_mac(hw);
1288	int associated;
1289
1290	dev_dbg_f(zd_mac_dev(mac), "changes: %llx\n", changes);
1291
1292	if (mac->type == NL80211_IFTYPE_MESH_POINT ||
1293	    mac->type == NL80211_IFTYPE_ADHOC ||
1294	    mac->type == NL80211_IFTYPE_AP) {
1295		associated = true;
1296		if (changes & BSS_CHANGED_BEACON) {
1297			struct sk_buff *beacon = ieee80211_beacon_get(hw, vif,
1298								      0);
1299
1300			if (beacon) {
1301				zd_chip_disable_hwint(&mac->chip);
1302				zd_mac_config_beacon(hw, beacon, false);
1303				zd_chip_enable_hwint(&mac->chip);
1304			}
1305		}
1306
1307		if (changes & BSS_CHANGED_BEACON_ENABLED) {
1308			u16 interval = 0;
1309			u8 period = 0;
1310
1311			if (bss_conf->enable_beacon) {
1312				period = bss_conf->dtim_period;
1313				interval = bss_conf->beacon_int;
1314			}
1315
1316			spin_lock_irq(&mac->lock);
1317			mac->beacon.period = period;
1318			mac->beacon.interval = interval;
1319			mac->beacon.last_update = jiffies;
1320			spin_unlock_irq(&mac->lock);
1321
1322			zd_set_beacon_interval(&mac->chip, interval, period,
1323					       mac->type);
1324		}
1325	} else
1326		associated = is_valid_ether_addr(bss_conf->bssid);
1327
1328	spin_lock_irq(&mac->lock);
1329	mac->associated = associated;
1330	spin_unlock_irq(&mac->lock);
1331
1332	/* TODO: do hardware bssid filtering */
1333
1334	if (changes & BSS_CHANGED_ERP_PREAMBLE) {
1335		spin_lock_irq(&mac->lock);
1336		mac->short_preamble = bss_conf->use_short_preamble;
1337		spin_unlock_irq(&mac->lock);
1338
1339		set_rts_cts(mac, bss_conf->use_short_preamble);
1340	}
1341}
1342
1343static u64 zd_op_get_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
1344{
1345	struct zd_mac *mac = zd_hw_mac(hw);
1346	return zd_chip_get_tsf(&mac->chip);
1347}
1348
1349static const struct ieee80211_ops zd_ops = {
1350	.add_chanctx = ieee80211_emulate_add_chanctx,
1351	.remove_chanctx = ieee80211_emulate_remove_chanctx,
1352	.change_chanctx = ieee80211_emulate_change_chanctx,
1353	.switch_vif_chanctx = ieee80211_emulate_switch_vif_chanctx,
1354	.tx			= zd_op_tx,
1355	.wake_tx_queue		= ieee80211_handle_wake_tx_queue,
1356	.start			= zd_op_start,
1357	.stop			= zd_op_stop,
1358	.add_interface		= zd_op_add_interface,
1359	.remove_interface	= zd_op_remove_interface,
1360	.config			= zd_op_config,
1361	.prepare_multicast	= zd_op_prepare_multicast,
1362	.configure_filter	= zd_op_configure_filter,
1363	.bss_info_changed	= zd_op_bss_info_changed,
1364	.get_tsf		= zd_op_get_tsf,
1365};
1366
1367struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf)
1368{
1369	struct zd_mac *mac;
1370	struct ieee80211_hw *hw;
1371
1372	hw = ieee80211_alloc_hw(sizeof(struct zd_mac), &zd_ops);
1373	if (!hw) {
1374		dev_dbg_f(&intf->dev, "out of memory\n");
1375		return NULL;
1376	}
1377
1378	mac = zd_hw_mac(hw);
1379
1380	memset(mac, 0, sizeof(*mac));
1381	spin_lock_init(&mac->lock);
1382	mac->hw = hw;
1383
1384	mac->type = NL80211_IFTYPE_UNSPECIFIED;
1385
1386	memcpy(mac->channels, zd_channels, sizeof(zd_channels));
1387	memcpy(mac->rates, zd_rates, sizeof(zd_rates));
1388	mac->band.n_bitrates = ARRAY_SIZE(zd_rates);
1389	mac->band.bitrates = mac->rates;
1390	mac->band.n_channels = ARRAY_SIZE(zd_channels);
1391	mac->band.channels = mac->channels;
1392
1393	hw->wiphy->bands[NL80211_BAND_2GHZ] = &mac->band;
1394
1395	ieee80211_hw_set(hw, MFP_CAPABLE);
1396	ieee80211_hw_set(hw, HOST_BROADCAST_PS_BUFFERING);
1397	ieee80211_hw_set(hw, RX_INCLUDES_FCS);
1398	ieee80211_hw_set(hw, SIGNAL_UNSPEC);
1399
1400	hw->wiphy->interface_modes =
1401		BIT(NL80211_IFTYPE_MESH_POINT) |
1402		BIT(NL80211_IFTYPE_STATION) |
1403		BIT(NL80211_IFTYPE_ADHOC) |
1404		BIT(NL80211_IFTYPE_AP);
1405
1406	wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
1407
1408	hw->max_signal = 100;
1409	hw->queues = 1;
1410	hw->extra_tx_headroom = sizeof(struct zd_ctrlset);
1411
1412	/*
1413	 * Tell mac80211 that we support multi rate retries
1414	 */
1415	hw->max_rates = IEEE80211_TX_MAX_RATES;
1416	hw->max_rate_tries = 18;	/* 9 rates * 2 retries/rate */
1417
1418	skb_queue_head_init(&mac->ack_wait_queue);
1419	mac->ack_pending = 0;
1420
1421	zd_chip_init(&mac->chip, hw, intf);
1422	housekeeping_init(mac);
1423	beacon_init(mac);
1424	INIT_WORK(&mac->process_intr, zd_process_intr);
1425
1426	SET_IEEE80211_DEV(hw, &intf->dev);
1427	return hw;
1428}
1429
1430#define BEACON_WATCHDOG_DELAY round_jiffies_relative(HZ)
1431
1432static void beacon_watchdog_handler(struct work_struct *work)
1433{
1434	struct zd_mac *mac =
1435		container_of(work, struct zd_mac, beacon.watchdog_work.work);
1436	struct sk_buff *beacon;
1437	unsigned long timeout;
1438	int interval, period;
1439
1440	if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1441		goto rearm;
1442	if (mac->type != NL80211_IFTYPE_AP || !mac->vif)
1443		goto rearm;
1444
1445	spin_lock_irq(&mac->lock);
1446	interval = mac->beacon.interval;
1447	period = mac->beacon.period;
1448	timeout = mac->beacon.last_update +
1449			msecs_to_jiffies(interval * 1024 / 1000) * 3;
1450	spin_unlock_irq(&mac->lock);
1451
1452	if (interval > 0 && time_is_before_jiffies(timeout)) {
1453		dev_dbg_f(zd_mac_dev(mac), "beacon interrupt stalled, "
1454					   "restarting. "
1455					   "(interval: %d, dtim: %d)\n",
1456					   interval, period);
1457
1458		zd_chip_disable_hwint(&mac->chip);
1459
1460		beacon = ieee80211_beacon_get(mac->hw, mac->vif, 0);
1461		if (beacon) {
1462			zd_mac_free_cur_beacon(mac);
1463
1464			zd_mac_config_beacon(mac->hw, beacon, false);
1465		}
1466
1467		zd_set_beacon_interval(&mac->chip, interval, period, mac->type);
1468
1469		zd_chip_enable_hwint(&mac->chip);
1470
1471		spin_lock_irq(&mac->lock);
1472		mac->beacon.last_update = jiffies;
1473		spin_unlock_irq(&mac->lock);
1474	}
1475
1476rearm:
1477	queue_delayed_work(zd_workqueue, &mac->beacon.watchdog_work,
1478			   BEACON_WATCHDOG_DELAY);
1479}
1480
1481static void beacon_init(struct zd_mac *mac)
1482{
1483	INIT_DELAYED_WORK(&mac->beacon.watchdog_work, beacon_watchdog_handler);
1484}
1485
1486static void beacon_enable(struct zd_mac *mac)
1487{
1488	dev_dbg_f(zd_mac_dev(mac), "\n");
1489
1490	mac->beacon.last_update = jiffies;
1491	queue_delayed_work(zd_workqueue, &mac->beacon.watchdog_work,
1492			   BEACON_WATCHDOG_DELAY);
1493}
1494
1495static void beacon_disable(struct zd_mac *mac)
1496{
1497	dev_dbg_f(zd_mac_dev(mac), "\n");
1498	cancel_delayed_work_sync(&mac->beacon.watchdog_work);
1499
1500	zd_mac_free_cur_beacon(mac);
1501}
1502
1503#define LINK_LED_WORK_DELAY HZ
1504
1505static void link_led_handler(struct work_struct *work)
1506{
1507	struct zd_mac *mac =
1508		container_of(work, struct zd_mac, housekeeping.link_led_work.work);
1509	struct zd_chip *chip = &mac->chip;
1510	int is_associated;
1511	int r;
1512
1513	if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1514		goto requeue;
1515
1516	spin_lock_irq(&mac->lock);
1517	is_associated = mac->associated;
1518	spin_unlock_irq(&mac->lock);
1519
1520	r = zd_chip_control_leds(chip,
1521		                 is_associated ? ZD_LED_ASSOCIATED : ZD_LED_SCANNING);
1522	if (r)
1523		dev_dbg_f(zd_mac_dev(mac), "zd_chip_control_leds error %d\n", r);
1524
1525requeue:
1526	queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1527		           LINK_LED_WORK_DELAY);
1528}
1529
1530static void housekeeping_init(struct zd_mac *mac)
1531{
1532	INIT_DELAYED_WORK(&mac->housekeeping.link_led_work, link_led_handler);
1533}
1534
1535static void housekeeping_enable(struct zd_mac *mac)
1536{
1537	dev_dbg_f(zd_mac_dev(mac), "\n");
1538	queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1539			   0);
1540}
1541
1542static void housekeeping_disable(struct zd_mac *mac)
1543{
1544	dev_dbg_f(zd_mac_dev(mac), "\n");
1545	cancel_delayed_work_sync(&mac->housekeeping.link_led_work);
1546	zd_chip_control_leds(&mac->chip, ZD_LED_OFF);
1547}