ath9k: Enable TSF Out of Range Interrupt

This patch lays the groundwork for handling TSF Out of Range
interrupt, which will be used for power save later on.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 27 insertions, 7 deletions

diff --git a/drivers/net/wireless/ath9k/beacon.c b/drivers/net/wireless/ath9k/beacon.c
index 2e2ef3529135..390d5109e826 100644
--- a/drivers/net/wireless/ath9k/beacon.c
+++ b/drivers/net/wireless/ath9k/beacon.c
@@ -753,6 +753,9 @@ void ath_beacon_config(struct ath_softc *sc, int if_id)
                 if (bs.bs_sleepduration > bs.bs_dtimperiod)
                         bs.bs_sleepduration = bs.bs_dtimperiod;
 
+                /* TSF out of range threshold fixed at 1 second */
+                bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
+
                 DPRINTF(sc, ATH_DBG_BEACON,
                         "tsf %llu "
                         "tsf:tu %u "
diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
index 6939e4142325..4af1aac16785 100644
--- a/drivers/net/wireless/ath9k/hw.c
+++ b/drivers/net/wireless/ath9k/hw.c
@@ -2803,6 +2803,8 @@ bool ath9k_hw_getisr(struct ath_hw *ah, enum ath9k_int *masked)
                                 mask2 |= ATH9K_INT_GTT;
                         if (isr2 & AR_ISR_S2_CST)
                                 mask2 |= ATH9K_INT_CST;
+                        if (isr2 & AR_ISR_S2_TSFOOR)
+                                mask2 |= ATH9K_INT_TSFOOR;
                 }
 
                 isr = REG_READ(ah, AR_ISR_RAC);
@@ -2948,7 +2950,9 @@ enum ath9k_int ath9k_hw_set_interrupts(struct ath_hw *ah, enum ath9k_int ints)
                 if (ints & ATH9K_INT_DTIMSYNC)
                         mask2 |= AR_IMR_S2_DTIMSYNC;
                 if (ints & ATH9K_INT_CABEND)
-                        mask2 |= (AR_IMR_S2_CABEND);
+                        mask2 |= AR_IMR_S2_CABEND;
+                if (ints & ATH9K_INT_TSFOOR)
+                        mask2 |= AR_IMR_S2_TSFOOR;
         }
 
         if (ints & (ATH9K_INT_GTT | ATH9K_INT_CST)) {
@@ -3118,6 +3122,8 @@ void ath9k_hw_set_sta_beacon_timers(struct ath_hw *ah,
                     AR_TBTT_TIMER_EN | AR_TIM_TIMER_EN |
                     AR_DTIM_TIMER_EN);
 
+        /* TSF Out of Range Threshold */
+        REG_WRITE(ah, AR_TSFOOR_THRESHOLD, bs->bs_tsfoor_threshold);
 }
 
 /*******************/
diff --git a/drivers/net/wireless/ath9k/hw.h b/drivers/net/wireless/ath9k/hw.h
index 82111636c693..587a78db748d 100644
--- a/drivers/net/wireless/ath9k/hw.h
+++ b/drivers/net/wireless/ath9k/hw.h
@@ -249,6 +249,7 @@ enum ath9k_int {
         ATH9K_INT_DTIMSYNC = 0x00800000,
         ATH9K_INT_GPIO = 0x01000000,
         ATH9K_INT_CABEND = 0x02000000,
+        ATH9K_INT_TSFOOR = 0x04000000,
         ATH9K_INT_CST = 0x10000000,
         ATH9K_INT_GTT = 0x20000000,
         ATH9K_INT_FATAL = 0x40000000,
@@ -256,6 +257,7 @@ enum ath9k_int {
         ATH9K_INT_BMISC = ATH9K_INT_TIM |
                 ATH9K_INT_DTIM |
                 ATH9K_INT_DTIMSYNC |
+                ATH9K_INT_TSFOOR |
                 ATH9K_INT_CABEND,
         ATH9K_INT_COMMON = ATH9K_INT_RXNOFRM |
                 ATH9K_INT_RXDESC |
@@ -385,6 +387,7 @@ struct ath9k_beacon_state {
 #define ATH9K_BEACON_PERIOD       0x0000ffff
 #define ATH9K_BEACON_ENA          0x00800000
 #define ATH9K_BEACON_RESET_TSF    0x01000000
+#define ATH9K_TSFOOR_THRESHOLD    0x00004240 /* 16k us */
         u32 bs_dtimperiod;
         u16 bs_cfpperiod;
         u16 bs_cfpmaxduration;
@@ -392,6 +395,7 @@ struct ath9k_beacon_state {
         u16 bs_timoffset;
         u16 bs_bmissthreshold;
         u32 bs_sleepduration;
+        u32 bs_tsfoor_threshold;
 };
 
 struct chan_centers {
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 7d7537e2738e..32cdb246a8f2 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -574,6 +574,10 @@ irqreturn_t ath_isr(int irq, void *dev)
                                         sc->sc_flags |= SC_OP_WAIT_FOR_BEACON;
                                 }
                         }
+                        if (status & ATH9K_INT_TSFOOR) {
+                                /* FIXME: Handle this interrupt for power save */
+                                sched = true;
+                        }
                 }
         } while (0);
 
@@ -2165,10 +2169,13 @@ static int ath9k_add_interface(struct ieee80211_hw *hw,
          * Enable MIB interrupts when there are hardware phy counters.
          * Note we only do this (at the moment) for station mode.
          */
-        if (ath9k_hw_phycounters(sc->sc_ah) &&
-            ((conf->type == NL80211_IFTYPE_STATION) ||
-             (conf->type == NL80211_IFTYPE_ADHOC)))
-                sc->imask |= ATH9K_INT_MIB;
+        if ((conf->type == NL80211_IFTYPE_STATION) ||
+            (conf->type == NL80211_IFTYPE_ADHOC)) {
+                if (ath9k_hw_phycounters(sc->sc_ah))
+                        sc->imask |= ATH9K_INT_MIB;
+                sc->imask |= ATH9K_INT_TSFOOR;
+        }
+
         /*
          * Some hardware processes the TIM IE and fires an
          * interrupt when the TIM bit is set.  For hardware
diff --git a/drivers/net/wireless/ath9k/reg.h b/drivers/net/wireless/ath9k/reg.h
index 17ed190349a5..a471832308a0 100644
--- a/drivers/net/wireless/ath9k/reg.h
+++ b/drivers/net/wireless/ath9k/reg.h
@@ -1385,8 +1385,8 @@ enum {
 #define AR_PHY_COUNTMAX        (3 << 22)
 #define AR_MIBCNT_INTRMASK     (3 << 22)
 
-#define AR_TSF_THRESHOLD       0x813c
-#define AR_TSF_THRESHOLD_VAL   0x0000FFFF
+#define AR_TSFOOR_THRESHOLD       0x813c
+#define AR_TSFOOR_THRESHOLD_VAL   0x0000FFFF
 
 #define AR_PHY_ERR_EIFS_MASK   8144