[ath_hal] Add get/set NAV functions

The NAV (network allocation vector) register reflects the current MAC
tracking of NAV - when it will stay quiet before transmitting.

Other devices transmit their frame durations in their 802.11 PHY headers
and all devices that hear a frame - even if it's one in an encoding
they don't understand - will understand the low bitrate PHY header that
includes the frame duration.  So, they'll set NAV to this value so
they'll stay quiet until the transmit completes.

Anyway, sometimes the PHY NAV header is garbled and sometimes, notably
older broadcom devices, will fake a long NAV so they can get "cleaner" air
for local calibration.  When this happens, the hardware will stay quiet
for quite some time and this can lead to missed/stuck beacons, or
(for Very Large Values) a MAC hang.

This code just adds the ability to get/set the NAV; the driver will
need to take care of using it during transmit hangs and beacon misses
to see if it's due to a trash looking NAV.

11 files changed, 106 insertions, 0 deletions

diff --git a/sys/contrib/dev/ath/ath_hal/ar9300/ar9300_freebsd.c b/sys/contrib/dev/ath/ath_hal/ar9300/ar9300_freebsd.c
index 37e64bc86cdd..68e5f018cc6c 100644
--- a/sys/contrib/dev/ath/ath_hal/ar9300/ar9300_freebsd.c
+++ b/sys/contrib/dev/ath/ath_hal/ar9300/ar9300_freebsd.c
@@ -69,6 +69,23 @@ ar9300_get_next_tbtt(struct ath_hal *ah)
 	return (OS_REG_READ(ah, AR_NEXT_TBTT_TIMER));
 }
 
+static u_int
+ar9300_get_nav(struct ath_hal *ah)
+{
+	uint32_t reg;
+
+	reg = OS_REG_READ(ah, AR_NAV);
+	if (reg == 0xdeadbeef)
+		return 0;
+	return reg;
+}
+
+static void
+ar9300_set_nav(struct ath_hal *ah, u_int nav)
+{
+
+	OS_REG_WRITE(ah, AR_NAV, nav);
+}
 
 /*
  * TODO: implement the antenna diversity control for AR9485 and
@@ -484,6 +501,8 @@ ar9300_attach_freebsd_ops(struct ath_hal *ah)
 	/* ah_get11nExtBusy */
 	ah->ah_set11nMac2040 = ar9300_set_11n_mac2040;
 	ah->ah_setChainMasks = ar9300SetChainMasks;
+	ah->ah_getNav  = ar9300_get_nav;
+	ah->ah_setNav  = ar9300_set_nav;
 	/* ah_get11nRxClear */
 	/* ah_set11nRxClear */
 
diff --git a/sys/dev/ath/ath_hal/ah.h b/sys/dev/ath/ath_hal/ah.h
index e39ff2b7d03d..4e811a5237ac 100644
--- a/sys/dev/ath/ath_hal/ah.h
+++ b/sys/dev/ath/ath_hal/ah.h
@@ -1404,6 +1404,8 @@ struct ath_hal {
 				HAL_QUIET_FLAG flag);
 	void	  __ahdecl(*ah_setChainMasks)(struct ath_hal *,
 				uint32_t, uint32_t);
+	u_int	  __ahdecl(*ah_getNav)(struct ath_hal*);
+	void	  __ahdecl(*ah_setNav)(struct ath_hal*, u_int);
 
 	/* DFS functions */
 	void	  __ahdecl(*ah_enableDfs)(struct ath_hal *ah,
diff --git a/sys/dev/ath/ath_hal/ar5210/ar5210.h b/sys/dev/ath/ath_hal/ar5210/ar5210.h
index 373c676e25b3..f09e99b1ce9e 100644
--- a/sys/dev/ath/ath_hal/ar5210/ar5210.h
+++ b/sys/dev/ath/ath_hal/ar5210/ar5210.h
@@ -269,6 +269,8 @@ extern	void ar5210SetChainMasks(struct ath_hal *, uint32_t, uint32_t);
 extern	void ar5210EnableDfs(struct ath_hal *, HAL_PHYERR_PARAM *);
 extern	void ar5210GetDfsThresh(struct ath_hal *, HAL_PHYERR_PARAM *);
 extern	void ar5210UpdateDiagReg(struct ath_hal *ah, uint32_t val);
+extern	void ar5210SetNav(struct ath_hal *ah, u_int val);
+extern	u_int ar5210GetNav(struct ath_hal *ah);
 
 extern	u_int ar5210GetKeyCacheSize(struct ath_hal *);
 extern	HAL_BOOL ar5210IsKeyCacheEntryValid(struct ath_hal *, uint16_t);
diff --git a/sys/dev/ath/ath_hal/ar5210/ar5210_attach.c b/sys/dev/ath/ath_hal/ar5210/ar5210_attach.c
index 22afc12a6dcc..8bbd7e9d600e 100644
--- a/sys/dev/ath/ath_hal/ar5210/ar5210_attach.c
+++ b/sys/dev/ath/ath_hal/ar5210/ar5210_attach.c
@@ -145,6 +145,8 @@ static const struct ath_hal_private ar5210hal = {{
 	.ah_getDfsThresh		= ar5210GetDfsThresh,
 	/* XXX procRadarEvent */
 	/* XXX isFastClockEnabled */
+	.ah_getNav			= ar5210GetNav,
+	.ah_setNav			= ar5210SetNav,
 
 	/* Key Cache Functions */
 	.ah_getKeyCacheSize		= ar5210GetKeyCacheSize,
diff --git a/sys/dev/ath/ath_hal/ar5210/ar5210_misc.c b/sys/dev/ath/ath_hal/ar5210/ar5210_misc.c
index 347ad8891e36..7c4df40a712f 100644
--- a/sys/dev/ath/ath_hal/ar5210/ar5210_misc.c
+++ b/sys/dev/ath/ath_hal/ar5210/ar5210_misc.c
@@ -710,3 +710,26 @@ ar5210UpdateDiagReg(struct ath_hal *ah, uint32_t val)
 	val |= AR_DIAG_SW_DIS_CRYPTO;
 	OS_REG_WRITE(ah, AR_DIAG_SW, val);
 }
+
+/*
+ * Get the current NAV value from the hardware.
+ */
+u_int
+ar5210GetNav(struct ath_hal *ah)
+{
+	uint32_t reg;
+
+	reg = OS_REG_READ(ah, AR_NAV);
+	return (reg);
+}
+
+/*
+ * Set the current NAV value to the hardware.
+ */
+void
+ar5210SetNav(struct ath_hal *ah, u_int val)
+{
+
+	OS_REG_WRITE(ah, AR_NAV, val);
+}
+
diff --git a/sys/dev/ath/ath_hal/ar5211/ar5211.h b/sys/dev/ath/ath_hal/ar5211/ar5211.h
index 186e69e9cd84..94a60162cbd8 100644
--- a/sys/dev/ath/ath_hal/ar5211/ar5211.h
+++ b/sys/dev/ath/ath_hal/ar5211/ar5211.h
@@ -291,6 +291,8 @@ extern	uint32_t ar5211Get11nExtBusy(struct ath_hal *);
 extern	HAL_BOOL ar5211GetMibCycleCounts(struct ath_hal *,
 		HAL_SURVEY_SAMPLE *);
 extern	void ar5211SetChainMasks(struct ath_hal *ah, uint32_t, uint32_t);
+extern	void ar5211SetNav(struct ath_hal *ah, u_int);
+extern	u_int ar5211GetNav(struct ath_hal *ah);
 
 extern	void ar5211EnableDfs(struct ath_hal *, HAL_PHYERR_PARAM *);
 extern	void ar5211GetDfsThresh(struct ath_hal *, HAL_PHYERR_PARAM *);
diff --git a/sys/dev/ath/ath_hal/ar5211/ar5211_attach.c b/sys/dev/ath/ath_hal/ar5211/ar5211_attach.c
index 1914cc3ea4cf..6253e7b8c9c5 100644
--- a/sys/dev/ath/ath_hal/ar5211/ar5211_attach.c
+++ b/sys/dev/ath/ath_hal/ar5211/ar5211_attach.c
@@ -145,6 +145,8 @@ static const struct ath_hal_private ar5211hal = {{
 	.ah_getDfsThresh		= ar5211GetDfsThresh,
 	/* XXX procRadarEvent */
 	/* XXX isFastClockEnabled */
+	.ah_setNav			= ar5211SetNav,
+	.ah_getNav			= ar5211GetNav,
 
 	/* Key Cache Functions */
 	.ah_getKeyCacheSize		= ar5211GetKeyCacheSize,
diff --git a/sys/dev/ath/ath_hal/ar5211/ar5211_misc.c b/sys/dev/ath/ath_hal/ar5211/ar5211_misc.c
index ea1327b11a6a..5bdae89a3055 100644
--- a/sys/dev/ath/ath_hal/ar5211/ar5211_misc.c
+++ b/sys/dev/ath/ath_hal/ar5211/ar5211_misc.c
@@ -733,3 +733,26 @@ void
 ar5211GetDfsThresh(struct ath_hal *ah, HAL_PHYERR_PARAM *pe)
 {
 }
+
+/*
+ * Get the current NAV value from the hardware.
+ */
+u_int
+ar5211GetNav(struct ath_hal *ah)
+{
+	uint32_t reg;
+
+	reg = OS_REG_READ(ah, AR_NAV);
+	return (reg);
+}
+
+/*
+ * Set the current NAV value to the hardware.
+ */
+void
+ar5211SetNav(struct ath_hal *ah, u_int val)
+{
+
+	OS_REG_WRITE(ah, AR_NAV, val);
+}
+
diff --git a/sys/dev/ath/ath_hal/ar5212/ar5212.h b/sys/dev/ath/ath_hal/ar5212/ar5212.h
index f80f88c5df85..3a08c1911a1c 100644
--- a/sys/dev/ath/ath_hal/ar5212/ar5212.h
+++ b/sys/dev/ath/ath_hal/ar5212/ar5212.h
@@ -529,6 +529,8 @@ extern	HAL_STATUS ar5212SetQuiet(struct ath_hal *ah, uint32_t period,
 extern	HAL_BOOL ar5212GetMibCycleCounts(struct ath_hal *,
 		HAL_SURVEY_SAMPLE *);
 extern	void ar5212SetChainMasks(struct ath_hal *, uint32_t, uint32_t);
+extern	u_int ar5212GetNav(struct ath_hal *);
+extern	void ar5212SetNav(struct ath_hal *, u_int);
 
 extern	HAL_BOOL ar5212SetPowerMode(struct ath_hal *ah, HAL_POWER_MODE mode,
 		int setChip);
diff --git a/sys/dev/ath/ath_hal/ar5212/ar5212_attach.c b/sys/dev/ath/ath_hal/ar5212/ar5212_attach.c
index 82bc762f75d2..0dd26558506a 100644
--- a/sys/dev/ath/ath_hal/ar5212/ar5212_attach.c
+++ b/sys/dev/ath/ath_hal/ar5212/ar5212_attach.c
@@ -137,6 +137,8 @@ static const struct ath_hal_private ar5212hal = {{
 	.ah_setQuiet			= ar5212SetQuiet,
 	.ah_getMibCycleCounts		= ar5212GetMibCycleCounts,
 	.ah_setChainMasks		= ar5212SetChainMasks,
+	.ah_getNav			= ar5212GetNav,
+	.ah_setNav			= ar5212SetNav,
 
 	/* DFS Functions */
 	.ah_enableDfs			= ar5212EnableDfs,
diff --git a/sys/dev/ath/ath_hal/ar5212/ar5212_misc.c b/sys/dev/ath/ath_hal/ar5212/ar5212_misc.c
index 577e1e7491b3..e6239902d713 100644
--- a/sys/dev/ath/ath_hal/ar5212/ar5212_misc.c
+++ b/sys/dev/ath/ath_hal/ar5212/ar5212_misc.c
@@ -1458,3 +1458,30 @@ ar5212SetChainMasks(struct ath_hal *ah, uint32_t tx_chainmask,
     uint32_t rx_chainmask)
 {
 }
+
+/*
+ * Get the current NAV value from the hardware.
+ *
+ * 0xdeadbeef indicates the hardware is currently powered off.
+ */
+u_int
+ar5212GetNav(struct ath_hal *ah)
+{
+	uint32_t reg;
+
+	reg = OS_REG_READ(ah, AR_NAV);
+
+	if (reg == 0xdeadbeef)
+		return (0);
+	return (reg);
+}
+
+/*
+ * Set the current NAV value to the hardware.
+ */
+void
+ar5212SetNav(struct ath_hal *ah, u_int val)
+{
+
+	OS_REG_WRITE(ah, AR_NAV, val);
+}