ath9k: fix short slot vs long slot handling, implement support for setting the coverage class

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19141 3c298f89-4303-0410-b956-a3cf2f4a3e73

3 files changed, 300 insertions, 0 deletions

diff --git a/package/mac80211/patches/540-short_slot_handling.patch b/package/mac80211/patches/540-short_slot_handling.patch
new file mode 100644
index 000000000..ed6831fbe
--- /dev/null
+++ b/package/mac80211/patches/540-short_slot_handling.patch
@@ -0,0 +1,11 @@
+--- a/net/mac80211/mlme.c
++++ b/net/mac80211/mlme.c
+@@ -670,6 +670,8 @@ static u32 ieee80211_handle_bss_capabili
+ 	}
+ 
+ 	use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
++	if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
++		use_short_slot = true;
+ 
+ 	if (use_protection != bss_conf->use_cts_prot) {
+ 		bss_conf->use_cts_prot = use_protection;
diff --git a/package/mac80211/patches/550-ath9k_clean_up_timing_handling.patch b/package/mac80211/patches/550-ath9k_clean_up_timing_handling.patch
new file mode 100644
index 000000000..dc6502274
--- /dev/null
+++ b/package/mac80211/patches/550-ath9k_clean_up_timing_handling.patch
@@ -0,0 +1,229 @@
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -1790,6 +1790,7 @@ static void ath9k_bss_info_changed(struc
+ 	struct ath_hw *ah = sc->sc_ah;
+ 	struct ath_common *common = ath9k_hw_common(ah);
+ 	struct ath_vif *avp = (void *)vif->drv_priv;
++	int slottime;
+ 	int error;
+ 
+ 	mutex_lock(&sc->mutex);
+@@ -1825,6 +1826,25 @@ static void ath9k_bss_info_changed(struc
+ 			ath_beacon_config(sc, vif);
+ 	}
+ 
++	if (changed & BSS_CHANGED_ERP_SLOT) {
++		if (bss_conf->use_short_slot)
++			slottime = 9;
++		else
++			slottime = 20;
++		if (vif->type == NL80211_IFTYPE_AP) {
++			/*
++			 * Defer update, so that connected stations can adjust
++			 * their settings at the same time.
++			 * See beacon.c for more details
++			 */
++			sc->beacon.slottime = slottime;
++			sc->beacon.updateslot = UPDATE;
++		} else {
++			ah->slottime = slottime;
++			ath9k_hw_init_global_settings(ah);
++		}
++	}
++
+ 	/* Disable transmission of beacons */
+ 	if ((changed & BSS_CHANGED_BEACON_ENABLED) && !bss_conf->enable_beacon)
+ 		ath9k_hw_stoptxdma(sc->sc_ah, sc->beacon.beaconq);
+--- a/drivers/net/wireless/ath/ath9k/hw.c
++++ b/drivers/net/wireless/ath/ath9k/hw.c
+@@ -55,28 +55,6 @@ module_exit(ath9k_exit);
+ /* Helper Functions */
+ /********************/
+ 
+-static u32 ath9k_hw_mac_usec(struct ath_hw *ah, u32 clks)
+-{
+-	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
+-
+-	if (!ah->curchan) /* should really check for CCK instead */
+-		return clks / ATH9K_CLOCK_RATE_CCK;
+-	if (conf->channel->band == IEEE80211_BAND_2GHZ)
+-		return clks / ATH9K_CLOCK_RATE_2GHZ_OFDM;
+-
+-	return clks / ATH9K_CLOCK_RATE_5GHZ_OFDM;
+-}
+-
+-static u32 ath9k_hw_mac_to_usec(struct ath_hw *ah, u32 clks)
+-{
+-	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
+-
+-	if (conf_is_ht40(conf))
+-		return ath9k_hw_mac_usec(ah, clks) / 2;
+-	else
+-		return ath9k_hw_mac_usec(ah, clks);
+-}
+-
+ static u32 ath9k_hw_mac_clks(struct ath_hw *ah, u32 usecs)
+ {
+ 	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
+@@ -413,8 +391,6 @@ static void ath9k_hw_init_defaults(struc
+ 	ah->beacon_interval = 100;
+ 	ah->enable_32kHz_clock = DONT_USE_32KHZ;
+ 	ah->slottime = (u32) -1;
+-	ah->acktimeout = (u32) -1;
+-	ah->ctstimeout = (u32) -1;
+ 	ah->globaltxtimeout = (u32) -1;
+ 	ah->power_mode = ATH9K_PM_UNDEFINED;
+ }
+@@ -1196,34 +1172,25 @@ static void ath9k_hw_init_interrupt_mask
+ 	}
+ }
+ 
+-static bool ath9k_hw_set_ack_timeout(struct ath_hw *ah, u32 us)
++static void ath9k_hw_setslottime(struct ath_hw *ah, u32 us)
+ {
+-	if (us > ath9k_hw_mac_to_usec(ah, MS(0xffffffff, AR_TIME_OUT_ACK))) {
+-		ath_print(ath9k_hw_common(ah), ATH_DBG_RESET,
+-			  "bad ack timeout %u\n", us);
+-		ah->acktimeout = (u32) -1;
+-		return false;
+-	} else {
+-		REG_RMW_FIELD(ah, AR_TIME_OUT,
+-			      AR_TIME_OUT_ACK, ath9k_hw_mac_to_clks(ah, us));
+-		ah->acktimeout = us;
+-		return true;
+-	}
++	u32 val = ath9k_hw_mac_to_clks(ah, us);
++	val = min(val, (u32) 0xFFFF);
++	REG_WRITE(ah, AR_D_GBL_IFS_SLOT, val);
+ }
+ 
+-static bool ath9k_hw_set_cts_timeout(struct ath_hw *ah, u32 us)
++static void ath9k_hw_set_ack_timeout(struct ath_hw *ah, u32 us)
+ {
+-	if (us > ath9k_hw_mac_to_usec(ah, MS(0xffffffff, AR_TIME_OUT_CTS))) {
+-		ath_print(ath9k_hw_common(ah), ATH_DBG_RESET,
+-			  "bad cts timeout %u\n", us);
+-		ah->ctstimeout = (u32) -1;
+-		return false;
+-	} else {
+-		REG_RMW_FIELD(ah, AR_TIME_OUT,
+-			      AR_TIME_OUT_CTS, ath9k_hw_mac_to_clks(ah, us));
+-		ah->ctstimeout = us;
+-		return true;
+-	}
++	u32 val = ath9k_hw_mac_to_clks(ah, us);
++	val = min(val, (u32) MS(0xFFFFFFFF, AR_TIME_OUT_ACK));
++	REG_RMW_FIELD(ah, AR_TIME_OUT, AR_TIME_OUT_ACK, val);
++}
++
++static void ath9k_hw_set_cts_timeout(struct ath_hw *ah, u32 us)
++{
++	u32 val = ath9k_hw_mac_to_clks(ah, us);
++	val = min(val, (u32) MS(0xFFFFFFFF, AR_TIME_OUT_CTS));
++	REG_RMW_FIELD(ah, AR_TIME_OUT, AR_TIME_OUT_CTS, val);
+ }
+ 
+ static bool ath9k_hw_set_global_txtimeout(struct ath_hw *ah, u32 tu)
+@@ -1240,23 +1207,32 @@ static bool ath9k_hw_set_global_txtimeou
+ 	}
+ }
+ 
+-static void ath9k_hw_init_user_settings(struct ath_hw *ah)
++void ath9k_hw_init_global_settings(struct ath_hw *ah)
+ {
++	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
++	int acktimeout;
++	int sifstime;
++
+ 	ath_print(ath9k_hw_common(ah), ATH_DBG_RESET, "ah->misc_mode 0x%x\n",
+ 		  ah->misc_mode);
+ 
+ 	if (ah->misc_mode != 0)
+ 		REG_WRITE(ah, AR_PCU_MISC,
+ 			  REG_READ(ah, AR_PCU_MISC) | ah->misc_mode);
+-	if (ah->slottime != (u32) -1)
+-		ath9k_hw_setslottime(ah, ah->slottime);
+-	if (ah->acktimeout != (u32) -1)
+-		ath9k_hw_set_ack_timeout(ah, ah->acktimeout);
+-	if (ah->ctstimeout != (u32) -1)
+-		ath9k_hw_set_cts_timeout(ah, ah->ctstimeout);
++
++	if (conf->channel && conf->channel->band == IEEE80211_BAND_5GHZ)
++		sifstime = 16;
++	else
++		sifstime = 10;
++
++	acktimeout = ah->slottime + sifstime;
++	ath9k_hw_setslottime(ah, ah->slottime);
++	ath9k_hw_set_ack_timeout(ah, acktimeout);
++	ath9k_hw_set_cts_timeout(ah, acktimeout);
+ 	if (ah->globaltxtimeout != (u32) -1)
+ 		ath9k_hw_set_global_txtimeout(ah, ah->globaltxtimeout);
+ }
++EXPORT_SYMBOL(ath9k_hw_init_global_settings);
+ 
+ void ath9k_hw_deinit(struct ath_hw *ah)
+ {
+@@ -2077,7 +2053,7 @@ int ath9k_hw_reset(struct ath_hw *ah, st
+ 	if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
+ 		ath9k_enable_rfkill(ah);
+ 
+-	ath9k_hw_init_user_settings(ah);
++	ath9k_hw_init_global_settings(ah);
+ 
+ 	if (AR_SREV_9287_12_OR_LATER(ah)) {
+ 		REG_WRITE(ah, AR_D_GBL_IFS_SIFS,
+@@ -3674,21 +3650,6 @@ u64 ath9k_hw_extend_tsf(struct ath_hw *a
+ }
+ EXPORT_SYMBOL(ath9k_hw_extend_tsf);
+ 
+-bool ath9k_hw_setslottime(struct ath_hw *ah, u32 us)
+-{
+-	if (us < ATH9K_SLOT_TIME_9 || us > ath9k_hw_mac_to_usec(ah, 0xffff)) {
+-		ath_print(ath9k_hw_common(ah), ATH_DBG_RESET,
+-			  "bad slot time %u\n", us);
+-		ah->slottime = (u32) -1;
+-		return false;
+-	} else {
+-		REG_WRITE(ah, AR_D_GBL_IFS_SLOT, ath9k_hw_mac_to_clks(ah, us));
+-		ah->slottime = us;
+-		return true;
+-	}
+-}
+-EXPORT_SYMBOL(ath9k_hw_setslottime);
+-
+ void ath9k_hw_set11nmac2040(struct ath_hw *ah)
+ {
+ 	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
+--- a/drivers/net/wireless/ath/ath9k/hw.h
++++ b/drivers/net/wireless/ath/ath9k/hw.h
+@@ -553,8 +553,6 @@ struct ath_hw {
+ 	int16_t txpower_indexoffset;
+ 	u32 beacon_interval;
+ 	u32 slottime;
+-	u32 acktimeout;
+-	u32 ctstimeout;
+ 	u32 globaltxtimeout;
+ 
+ 	/* ANI */
+@@ -668,7 +666,7 @@ void ath9k_hw_settsf64(struct ath_hw *ah
+ void ath9k_hw_reset_tsf(struct ath_hw *ah);
+ void ath9k_hw_set_tsfadjust(struct ath_hw *ah, u32 setting);
+ u64 ath9k_hw_extend_tsf(struct ath_hw *ah, u32 rstamp);
+-bool ath9k_hw_setslottime(struct ath_hw *ah, u32 us);
++void ath9k_hw_init_global_settings(struct ath_hw *ah);
+ void ath9k_hw_set11nmac2040(struct ath_hw *ah);
+ void ath9k_hw_beaconinit(struct ath_hw *ah, u32 next_beacon, u32 beacon_period);
+ void ath9k_hw_set_sta_beacon_timers(struct ath_hw *ah,
+--- a/drivers/net/wireless/ath/ath9k/beacon.c
++++ b/drivers/net/wireless/ath/ath9k/beacon.c
+@@ -480,7 +480,8 @@ void ath_beacon_tasklet(unsigned long da
+ 		sc->beacon.updateslot = COMMIT; /* commit next beacon */
+ 		sc->beacon.slotupdate = slot;
+ 	} else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
+-		ath9k_hw_setslottime(sc->sc_ah, sc->beacon.slottime);
++		ah->slottime = sc->beacon.slottime;
++		ath9k_hw_init_global_settings(ah);
+ 		sc->beacon.updateslot = OK;
+ 	}
+ 	if (bfaddr != 0) {
diff --git a/package/mac80211/patches/560-ath9k_coverage_class.patch b/package/mac80211/patches/560-ath9k_coverage_class.patch
new file mode 100644
index 000000000..035eabb1f
--- /dev/null
+++ b/package/mac80211/patches/560-ath9k_coverage_class.patch
@@ -0,0 +1,60 @@
+--- a/drivers/net/wireless/ath/ath9k/hw.c
++++ b/drivers/net/wireless/ath/ath9k/hw.c
+@@ -1211,6 +1211,7 @@ void ath9k_hw_init_global_settings(struc
+ {
+ 	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
+ 	int acktimeout;
++	int slottime;
+ 	int sifstime;
+ 
+ 	ath_print(ath9k_hw_common(ah), ATH_DBG_RESET, "ah->misc_mode 0x%x\n",
+@@ -1225,8 +1226,10 @@ void ath9k_hw_init_global_settings(struc
+ 	else
+ 		sifstime = 10;
+ 
+-	acktimeout = ah->slottime + sifstime;
+-	ath9k_hw_setslottime(ah, ah->slottime);
++	/* As defined by IEEE 802.11-2007 17.3.8.6 */
++	slottime = ah->slottime + 3 * ah->coverage_class;
++	acktimeout = slottime + sifstime;
++	ath9k_hw_setslottime(ah, slottime);
+ 	ath9k_hw_set_ack_timeout(ah, acktimeout);
+ 	ath9k_hw_set_cts_timeout(ah, acktimeout);
+ 	if (ah->globaltxtimeout != (u32) -1)
+--- a/drivers/net/wireless/ath/ath9k/hw.h
++++ b/drivers/net/wireless/ath/ath9k/hw.h
+@@ -551,6 +551,7 @@ struct ath_hw {
+ 	u32 *bank6Temp;
+ 
+ 	int16_t txpower_indexoffset;
++	int coverage_class;
+ 	u32 beacon_interval;
+ 	u32 slottime;
+ 	u32 globaltxtimeout;
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -2015,6 +2015,18 @@ static void ath9k_sw_scan_complete(struc
+ 	mutex_unlock(&sc->mutex);
+ }
+ 
++static void ath9k_set_coverage_class(struct ieee80211_hw *hw, u8 coverage_class)
++{
++	struct ath_wiphy *aphy = hw->priv;
++	struct ath_softc *sc = aphy->sc;
++	struct ath_hw *ah = sc->sc_ah;
++
++	mutex_lock(&sc->mutex);
++	ah->coverage_class = coverage_class;
++	ath9k_hw_init_global_settings(ah);
++	mutex_unlock(&sc->mutex);
++}
++
+ struct ieee80211_ops ath9k_ops = {
+ 	.tx 		    = ath9k_tx,
+ 	.start 		    = ath9k_start,
+@@ -2034,4 +2046,5 @@ struct ieee80211_ops ath9k_ops = {
+ 	.sw_scan_start      = ath9k_sw_scan_start,
+ 	.sw_scan_complete   = ath9k_sw_scan_complete,
+ 	.rfkill_poll        = ath9k_rfkill_poll_state,
++	.set_coverage_class = ath9k_set_coverage_class,
+ };