2  * Copyright (c) 2004-2008 Reyk Floeter <reyk@openbsd.org>
3  * Copyright (c) 2006-2008 Nick Kossifidis <mickflemm@gmail.com>
4  * Copyright (c) 2007-2008 Matthew W. S. Bell  <mentor@madwifi.org>
5  * Copyright (c) 2007-2008 Luis Rodriguez <mcgrof@winlab.rutgers.edu>
6  * Copyright (c) 2007-2008 Pavel Roskin <proski@gnu.org>
7  * Copyright (c) 2007-2008 Jiri Slaby <jirislaby@gmail.com>
40  * - Buffering of RX and TX frames (after QCU/DCUs)
42  * - Encrypting and decrypting (using the built-in engine)
44  * - Generating ACKs, RTS/CTS frames
46  * - Maintaining TSF
48  * - FCS
50  * - Updating beacon data (with TSF etc)
52  * - Generating virtual CCA
54  * - RX/Multicast filtering
56  * - BSSID filtering
58  * - Various statistics
60  * -Different operating modes: AP, STA, IBSS
71  * based on current tx rate instead of the base rate.
75  * rate -> duration table. This mapping is hw-based so
79  * ah->ah_ack_bitrate_high to true else base rate is
83 /* Tx	-> ACK	*/
84 /* 1Mb	-> 1Mb	*/	{ 0,
85 /* 2MB	-> 2Mb	*/	1,
86 /* 5.5Mb -> 2Mb	*/	1,
87 /* 11Mb	-> 2Mb	*/	1,
88 /* 6Mb	-> 6Mb	*/	4,
89 /* 9Mb	-> 6Mb	*/	4,
90 /* 12Mb	-> 12Mb	*/	6,
91 /* 18Mb	-> 12Mb	*/	6,
92 /* 24Mb	-> 24Mb	*/	8,
93 /* 36Mb	-> 24Mb	*/	8,
94 /* 48Mb	-> 24Mb	*/	8,
95 /* 54Mb	-> 24Mb	*/	8 };
102  * ath5k_hw_get_frame_duration() - Get tx time of a frame
106  * @rate: The @struct ieee80211_rate
109  * Calculate tx duration of a frame given it's rate and length
115 		int len, struct ieee80211_rate *rate, bool shortpre)  in ath5k_hw_get_frame_duration()  argument
122 	if (!ah->ah_bwmode) {  in ath5k_hw_get_frame_duration()
123 		__le16 raw_dur = ieee80211_generic_frame_duration(ah->hw,  in ath5k_hw_get_frame_duration()
124 					NULL, band, len, rate);  in ath5k_hw_get_frame_duration()
129 			dur -= 96;  in ath5k_hw_get_frame_duration()
134 	bitrate = rate->bitrate;  in ath5k_hw_get_frame_duration()
139 	switch (ah->ah_bwmode) {  in ath5k_hw_get_frame_duration()
162 	/* Bit rate is in 100Kbits */  in ath5k_hw_get_frame_duration()
172  * ath5k_hw_get_default_slottime() - Get the default slot time for current mode
178 	struct ieee80211_channel *channel = ah->ah_current_channel;  in ath5k_hw_get_default_slottime()
181 	switch (ah->ah_bwmode) {  in ath5k_hw_get_default_slottime()
194 		if ((channel->hw_value == AR5K_MODE_11B) && !ah->ah_short_slot)  in ath5k_hw_get_default_slottime()
203  * ath5k_hw_get_default_sifs() - Get the default SIFS for current mode
209 	struct ieee80211_channel *channel = ah->ah_current_channel;  in ath5k_hw_get_default_sifs()
212 	switch (ah->ah_bwmode) {  in ath5k_hw_get_default_sifs()
225 		if (channel->band == NL80211_BAND_5GHZ)  in ath5k_hw_get_default_sifs()
234  * ath5k_hw_update_mib_counters() - Update MIB counters (mac layer statistics)
246 	struct ath5k_statistics *stats = &ah->stats;  in ath5k_hw_update_mib_counters()
248 	/* Read-And-Clear */  in ath5k_hw_update_mib_counters()
249 	stats->ack_fail += ath5k_hw_reg_read(ah, AR5K_ACK_FAIL);  in ath5k_hw_update_mib_counters()
250 	stats->rts_fail += ath5k_hw_reg_read(ah, AR5K_RTS_FAIL);  in ath5k_hw_update_mib_counters()
251 	stats->rts_ok += ath5k_hw_reg_read(ah, AR5K_RTS_OK);  in ath5k_hw_update_mib_counters()
252 	stats->fcs_error += ath5k_hw_reg_read(ah, AR5K_FCS_FAIL);  in ath5k_hw_update_mib_counters()
253 	stats->beacons += ath5k_hw_reg_read(ah, AR5K_BEACON_CNT);  in ath5k_hw_update_mib_counters()
262  * ath5k_hw_write_rate_duration() - Fill rate code to duration table
265  * Write the rate code to duration table upon hw reset. This is a helper for
267  * the hardware, based on current mode, for each rate. The rates which are
268  * capable of short preamble (802.11b rates 2Mbps, 5.5Mbps, and 11Mbps) have
269  * different rate code so we write their value twice (one for long preamble
280 	struct ieee80211_rate *rate;  in ath5k_hw_write_rate_duration()  local
285 	/* Write rate duration table */  in ath5k_hw_write_rate_duration()
286 	for (i = 0; i < ah->sbands[band].n_bitrates; i++) {  in ath5k_hw_write_rate_duration()
290 		if (ah->ah_ack_bitrate_high)  in ath5k_hw_write_rate_duration()
291 			rate = &ah->sbands[band].bitrates[ack_rates_high[i]];  in ath5k_hw_write_rate_duration()
292 		/* CCK -> 1Mb */  in ath5k_hw_write_rate_duration()
294 			rate = &ah->sbands[band].bitrates[0];  in ath5k_hw_write_rate_duration()
295 		/* OFDM -> 6Mb */  in ath5k_hw_write_rate_duration()
297 			rate = &ah->sbands[band].bitrates[4];  in ath5k_hw_write_rate_duration()
300 		reg = AR5K_RATE_DUR(rate->hw_value);  in ath5k_hw_write_rate_duration()
304 		 * its 14 bytes. Note we use the control rate and not the  in ath5k_hw_write_rate_duration()
305 		 * actual rate for this rate. See mac80211 tx.c  in ath5k_hw_write_rate_duration()
307 		 * what rate we should choose to TX ACKs. */  in ath5k_hw_write_rate_duration()
309 					rate, false);  in ath5k_hw_write_rate_duration()
313 		if (!(rate->flags & IEEE80211_RATE_SHORT_PREAMBLE))  in ath5k_hw_write_rate_duration()
316 		tx_time = ath5k_hw_get_frame_duration(ah, band, 10, rate, true);  in ath5k_hw_write_rate_duration()
323  * ath5k_hw_set_ack_timeout() - Set ACK timeout on PCU
332 		return -EINVAL;  in ath5k_hw_set_ack_timeout()
341  * ath5k_hw_set_cts_timeout() - Set CTS timeout on PCU
350 		return -EINVAL;  in ath5k_hw_set_cts_timeout()
364  * ath5k_hw_set_lladdr() - Set station id
378 	memcpy(common->macaddr, mac, ETH_ALEN);  in ath5k_hw_set_lladdr()
392  * ath5k_hw_set_bssid() - Set current BSSID on hw
407 	if (ah->ah_version == AR5K_AR5212)  in ath5k_hw_set_bssid()
414 			   get_unaligned_le32(common->curbssid),  in ath5k_hw_set_bssid()
417 			   get_unaligned_le16(common->curbssid + 4) |  in ath5k_hw_set_bssid()
418 			   ((common->curaid & 0x3fff) << AR5K_BSS_ID1_AID_S),  in ath5k_hw_set_bssid()
421 	if (common->curaid == 0) {  in ath5k_hw_set_bssid()
433  * ath5k_hw_set_bssid_mask() - Filter out bssids we listen
454 	memcpy(common->bssidmask, mask, ETH_ALEN);  in ath5k_hw_set_bssid_mask()
455 	if (ah->ah_version == AR5K_AR5212)  in ath5k_hw_set_bssid_mask()
460  * ath5k_hw_set_mcast_filter() - Set multicast filter
473  * ath5k_hw_get_rx_filter() - Get current rx filter
490 	if (ah->ah_version == AR5K_AR5212) {  in ath5k_hw_get_rx_filter()
503  * ath5k_hw_set_rx_filter() - Set rx filter
517 	if (ah->ah_version == AR5K_AR5212) {  in ath5k_hw_set_rx_filter()
527 	if (ah->ah_version == AR5K_AR5210 &&  in ath5k_hw_set_rx_filter()
543 	if (ah->ah_version == AR5K_AR5212)  in ath5k_hw_set_rx_filter()
556  * ath5k_hw_get_tsf64() - Get the full 64bit TSF
568 	/* This code is time critical - we don't want to be interrupted here */  in ath5k_hw_get_tsf64()
602  * ath5k_hw_set_tsf64() - Set a new 64bit TSF
616  * ath5k_hw_reset_tsf() - Force a TSF reset
639  * ath5k_hw_init_beacon_timers() - Initialize beacon timers
655 	switch (ah->opmode) {  in ath5k_hw_init_beacon_timers()
662 		if (ah->ah_version == AR5K_AR5210) {  in ath5k_hw_init_beacon_timers()
676 		/* On non-STA modes timer1 is used as next DMA  in ath5k_hw_init_beacon_timers()
679 		timer1 = (next_beacon - AR5K_TUNE_DMA_BEACON_RESP) << 3;  in ath5k_hw_init_beacon_timers()
680 		timer2 = (next_beacon - AR5K_TUNE_SW_BEACON_RESP) << 3;  in ath5k_hw_init_beacon_timers()
693 	if (ah->opmode == NL80211_IFTYPE_AP ||  in ath5k_hw_init_beacon_timers()
694 	    ah->opmode == NL80211_IFTYPE_MESH_POINT)  in ath5k_hw_init_beacon_timers()
711 	 * performing a clear-on-write operation on PISR  in ath5k_hw_init_beacon_timers()
715 	if (ah->ah_version == AR5K_AR5210)  in ath5k_hw_init_beacon_timers()
721 	 * based on vif->bss_conf params, until then  in ath5k_hw_init_beacon_timers()
728  * ath5k_check_timer_win() - Check if timer B is timer A + window
729  * @a: timer a (before b)
730  * @b: timer b (after a)
731  * @window: difference between a and b
734  * This helper function checks if timer B is timer A + window and covers
735  * cases where timer A or B might have already been updated or wrapped
741 ath5k_check_timer_win(int a, int b, int window, int intval)  in ath5k_check_timer_win()  argument
744 	 * 1.) usually B should be A + window  in ath5k_check_timer_win()
745 	 * 2.) A already updated, B not updated yet  in ath5k_check_timer_win()
747 	 * 4.) B has wrapped around  in ath5k_check_timer_win()
749 	if ((b - a == window) ||				/* 1.) */  in ath5k_check_timer_win()
750 	    (a - b == intval - window) ||			/* 2.) */  in ath5k_check_timer_win()
751 	    ((a | 0x10000) - b == intval - window) ||		/* 3.) */  in ath5k_check_timer_win()
752 	    ((b | 0x10000) - a == window))			/* 4.) */  in ath5k_check_timer_win()
758  * ath5k_hw_check_beacon_timers() - Check if the beacon timers are correct
765  * HW timer registers (TIMER0 - TIMER3), which are closely related to the
772  * at any time - this is something we can't avoid. If the TSF jumps to a
783  * updated again. But - because the beacon interval is usually not an exact
817  * ath5k_hw_set_coverage_class() - Set IEEE 802.11 coverage class
826 	/* As defined by IEEE 802.11-2007 17.3.8.6 */  in ath5k_hw_set_coverage_class()
835 	ah->ah_coverage_class = coverage_class;  in ath5k_hw_set_coverage_class()
843  * ath5k_hw_start_rx_pcu() - Start RX engine
858  * ath5k_hw_stop_rx_pcu() - Stop RX engine
870  * ath5k_hw_set_opmode() - Set PCU operating mode
888 			| (ah->ah_version == AR5K_AR5210 ?  in ath5k_hw_set_opmode()
897 		if (ah->ah_version == AR5K_AR5210)  in ath5k_hw_set_opmode()
907 		if (ah->ah_version == AR5K_AR5210)  in ath5k_hw_set_opmode()
915 			| (ah->ah_version == AR5K_AR5210 ?  in ath5k_hw_set_opmode()
920 			| (ah->ah_version == AR5K_AR5210 ?  in ath5k_hw_set_opmode()
925 		return -EINVAL;  in ath5k_hw_set_opmode()
931 	low_id = get_unaligned_le32(common->macaddr);  in ath5k_hw_set_opmode()
932 	high_id = get_unaligned_le16(common->macaddr + 4);  in ath5k_hw_set_opmode()
939 	if (ah->ah_version == AR5K_AR5210)  in ath5k_hw_set_opmode()
946  * ath5k_hw_pcu_init() - Initialize PCU
962 	/* Write rate duration table only on AR5212 and if  in ath5k_hw_pcu_init()
966 	if (ah->ah_version == AR5K_AR5212 &&  in ath5k_hw_pcu_init()
967 		ah->nvifs)  in ath5k_hw_pcu_init()
984 	if (ah->ah_mac_srev >= AR5K_SREV_AR2413) {  in ath5k_hw_pcu_init()
990 	if (ah->ah_version == AR5K_AR5212) {  in ath5k_hw_pcu_init()
999 	if (ah->ah_coverage_class > 0)  in ath5k_hw_pcu_init()
1000 		ath5k_hw_set_coverage_class(ah, ah->ah_coverage_class);  in ath5k_hw_pcu_init()
1003 	if (ah->ah_version == AR5K_AR5212) {  in ath5k_hw_pcu_init()
1005 		if (ah->ah_ack_bitrate_high)  in ath5k_hw_pcu_init()