Prepare for improved (read: pcie) suspend/resume support.

* Flesh out the pcie disable method for 11n chips, as they were defaulting
  to the AR5212 (empty) PCIe disable method.

* Add accessor macros for the HAL PCIe enable/disable calls.

* Call disable on ath_suspend()

* Call enable on ath_resume()

NOTE:

* This has nothing to do with the NIC sleep/run state - the NIC still
  will stay in network-run state rather than supporting network-sleep
  state.  This is preparation work for supporting correct suspend/resume
  WARs for the 11n PCIe NICs.

TODO:

* It may be feasible at this point to keep the chip powered down during
  initial probe/attach and only power it up upon the first configure/reset
  pass.  This however would require correct (for values of "correct")
  tracking of the NIC power configuration state from the driver and that
  just isn't attempted at the moment.

Tested:

* AR9280 on my Lenovo T60, but with no suspend/resume pass (yet).

sys/dev/ath/ath_hal/ar5416/ar5416_attach.c

@@ -31,6 +31,7 @@
 #include "ar5416/ar5416.ini"
 
 static void ar5416ConfigPCIE(struct ath_hal *ah, HAL_BOOL restore);
+static void ar5416DisablePCIE(struct ath_hal *ah);
 static void ar5416WriteIni(struct ath_hal *ah,
 	    const struct ieee80211_channel *chan);
 static void ar5416SpurMitigate(struct ath_hal *ah,
@@ -99,6 +100,7 @@ ar5416InitState(struct ath_hal_5416 *ahp5416, uint16_t devid, HAL_SOFTC sc,
 	ah->ah_phyDisable		= ar5416PhyDisable;
 	ah->ah_disable			= ar5416Disable;
 	ah->ah_configPCIE		= ar5416ConfigPCIE;
+	ah->ah_disablePCIE		= ar5416DisablePCIE;
 	ah->ah_perCalibration		= ar5416PerCalibration;
 	ah->ah_perCalibrationN		= ar5416PerCalibrationN,
 	ah->ah_resetCalValid		= ar5416ResetCalValid,
@@ -473,6 +475,12 @@ ar5416ConfigPCIE(struct ath_hal *ah, HAL_BOOL restore)
 	}
 }
 
+static void
+ar5416DisablePCIE(struct ath_hal *ah)
+{
+	/* XXX TODO */
+}
+
 static void
 ar5416WriteIni(struct ath_hal *ah, const struct ieee80211_channel *chan)
 {

sys/dev/ath/ath_hal/ar9002/ar9280_attach.c

@@ -62,6 +62,7 @@ static const HAL_PERCAL_DATA ar9280_adc_init_dc_cal = {
 };
 
 static void ar9280ConfigPCIE(struct ath_hal *ah, HAL_BOOL restore);
+static void ar9280DisablePCIE(struct ath_hal *ah);
 static HAL_BOOL ar9280FillCapabilityInfo(struct ath_hal *ah);
 static void ar9280WriteIni(struct ath_hal *ah,
 	const struct ieee80211_channel *chan);
@@ -187,6 +188,7 @@ ar9280Attach(uint16_t devid, HAL_SOFTC sc,
 
 	ah->ah_setAntennaSwitch		= ar9280SetAntennaSwitch;
 	ah->ah_configPCIE		= ar9280ConfigPCIE;
+	ah->ah_disablePCIE		= ar9280DisablePCIE;
 
 	AH5416(ah)->ah_cal.iqCalData.calData = &ar9280_iq_cal;
 	AH5416(ah)->ah_cal.adcGainCalData.calData = &ar9280_adc_gain_cal;
@@ -425,6 +427,12 @@ ar9280ConfigPCIE(struct ath_hal *ah, HAL_BOOL restore)
 	}
 }
 
+static void
+ar9280DisablePCIE(struct ath_hal *ah)
+{
+	/* XXX TODO */
+}
+
 static void
 ar9280WriteIni(struct ath_hal *ah, const struct ieee80211_channel *chan)
 {

sys/dev/ath/ath_hal/ar9002/ar9285_attach.c

@@ -67,6 +67,7 @@ static const HAL_PERCAL_DATA ar9280_adc_init_dc_cal = {
 };
 
 static void ar9285ConfigPCIE(struct ath_hal *ah, HAL_BOOL restore);
+static void ar9285DisablePCIE(struct ath_hal *ah);
 static HAL_BOOL ar9285FillCapabilityInfo(struct ath_hal *ah);
 static void ar9285WriteIni(struct ath_hal *ah,
 	const struct ieee80211_channel *chan);
@@ -152,6 +153,7 @@ ar9285Attach(uint16_t devid, HAL_SOFTC sc,
 
 	ah->ah_setAntennaSwitch		= ar9285SetAntennaSwitch;
 	ah->ah_configPCIE		= ar9285ConfigPCIE;
+	ah->ah_disablePCIE		= ar9285DisablePCIE;
 	ah->ah_setTxPower		= ar9285SetTransmitPower;
 	ah->ah_setBoardValues		= ar9285SetBoardValues;
 
@@ -372,6 +374,12 @@ ar9285ConfigPCIE(struct ath_hal *ah, HAL_BOOL restore)
 	}
 }
 
+static void
+ar9285DisablePCIE(struct ath_hal *ah)
+{
+	/* XXX TODO */
+}
+
 static void
 ar9285WriteIni(struct ath_hal *ah, const struct ieee80211_channel *chan)
 {

sys/dev/ath/ath_hal/ar9002/ar9287_attach.c

@@ -66,6 +66,7 @@ static const HAL_PERCAL_DATA ar9287_adc_init_dc_cal = {
 };
 
 static void ar9287ConfigPCIE(struct ath_hal *ah, HAL_BOOL restore);
+static void ar9287DisablePCIE(struct ath_hal *ah);
 static HAL_BOOL ar9287FillCapabilityInfo(struct ath_hal *ah);
 static void ar9287WriteIni(struct ath_hal *ah,
 	const struct ieee80211_channel *chan);
@@ -141,6 +142,7 @@ ar9287Attach(uint16_t devid, HAL_SOFTC sc,
 
 	ah->ah_setAntennaSwitch		= ar9287SetAntennaSwitch;
 	ah->ah_configPCIE		= ar9287ConfigPCIE;
+	ah->ah_disablePCIE		= ar9287DisablePCIE;
 
 	AH5416(ah)->ah_cal.iqCalData.calData = &ar9287_iq_cal;
 	AH5416(ah)->ah_cal.adcGainCalData.calData = &ar9287_adc_gain_cal;
@@ -367,6 +369,12 @@ ar9287ConfigPCIE(struct ath_hal *ah, HAL_BOOL restore)
 	}
 }
 
+static void
+ar9287DisablePCIE(struct ath_hal *ah)
+{
+	/* XXX TODO */
+}
+
 static void
 ar9287WriteIni(struct ath_hal *ah, const struct ieee80211_channel *chan)
 {

sys/dev/ath/if_ath.c

@@ -1318,6 +1318,9 @@ ath_suspend(struct ath_softc *sc)
 	 * mode; pci will power off our socket on suspend and
 	 * CardBus detaches the device.
 	 */
+
+	/* For PCIe, this matters */
+	ath_hal_disablepcie(sc->sc_ah);
 }
 
 /*
@@ -1350,6 +1353,9 @@ ath_resume(struct ath_softc *sc)
 	DPRINTF(sc, ATH_DEBUG_ANY, "%s: if_flags %x\n",
 		__func__, ifp->if_flags);
 
+	/* Re-enable PCIe, re-enable the PCIe bus */
+	ath_hal_enablepcie(ah, 1);
+
 	/*
 	 * Must reset the chip before we reload the
 	 * keycache as we were powered down on suspend.

sys/dev/ath/if_athvar.h

@@ -995,6 +995,14 @@ void	ath_intr(void *);
 #define	ath_hal_gpiosetintr(_ah, _gpio, _b) \
 	((*(_ah)->ah_gpioSetIntr)((_ah), (_gpio), (_b)))
 
+/*
+ * PCIe suspend/resume/poweron/poweroff related macros
+ */
+#define	ath_hal_enablepcie(_ah, _restore) \
+	((*(_ah)->ah_configPCIE)((_ah), (_restore)))
+#define	ath_hal_disablepcie(_ah) \
+	((*(_ah)->ah_disablePCIE)((_ah)))
+
 /*
  * This is badly-named; you need to set the correct parameters
  * to begin to receive useful radar events; and even then