ath5k: use the common cycle counter / listen time implementation

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath5k/ani.c

@@ -355,41 +355,28 @@ ath5k_ani_lower_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as)
 
 
 /**
- * ath5k_hw_ani_get_listen_time() - Calculate time spent listening
+ * ath5k_hw_ani_get_listen_time() - Update counters and return listening time
  *
  * Return an approximation of the time spent "listening" in milliseconds (ms)
- * since the last call of this function by deducting the cycles spent
- * transmitting and receiving from the total cycle count.
- * Save profile count values for debugging/statistics and because we might want
- * to use them later.
- *
- * We assume no one else clears these registers!
+ * since the last call of this function.
+ * Save a snapshot of the counter values for debugging/statistics.
  */
 static int
 ath5k_hw_ani_get_listen_time(struct ath5k_hw *ah, struct ath5k_ani_state *as)
 {
+	struct ath_common *common = ath5k_hw_common(ah);
 	int listen;
 
-	/* freeze */
-	ath5k_hw_reg_write(ah, AR5K_MIBC_FMC, AR5K_MIBC);
-	/* read */
-	as->pfc_cycles = ath5k_hw_reg_read(ah, AR5K_PROFCNT_CYCLE);
-	as->pfc_busy = ath5k_hw_reg_read(ah, AR5K_PROFCNT_RXCLR);
-	as->pfc_tx = ath5k_hw_reg_read(ah, AR5K_PROFCNT_TX);
-	as->pfc_rx = ath5k_hw_reg_read(ah, AR5K_PROFCNT_RX);
-	/* clear */
-	ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_TX);
-	ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_RX);
-	ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_RXCLR);
-	ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_CYCLE);
-	/* un-freeze */
-	ath5k_hw_reg_write(ah, 0, AR5K_MIBC);
-
-	/* TODO: where does 44000 come from? (11g clock rate?) */
-	listen = (as->pfc_cycles - as->pfc_rx - as->pfc_tx) / 44000;
-
-	if (as->pfc_cycles == 0 || listen < 0)
-		return 0;
+	spin_lock_bh(&common->cc_lock);
+
+	ath_hw_cycle_counters_update(common);
+	memcpy(&as->last_cc, &common->cc_ani, sizeof(as->last_cc));
+
+	/* clears common->cc_ani */
+	listen = ath_hw_get_listen_time(common);
+
+	spin_unlock_bh(&common->cc_lock);
+
 	return listen;
 }
 

drivers/net/wireless/ath/ath5k/ani.h

@@ -75,10 +75,7 @@ struct ath5k_ani_state {
 	unsigned int		cck_errors;
 
 	/* debug/statistics only: numbers from last ANI calibration */
-	unsigned int		pfc_tx;
-	unsigned int		pfc_rx;
-	unsigned int		pfc_busy;
-	unsigned int		pfc_cycles;
+	struct ath_cycle_counters last_cc;
 	unsigned int		last_listen;
 	unsigned int		last_ofdm_errors;
 	unsigned int		last_cck_errors;

drivers/net/wireless/ath/ath5k/debug.c

@@ -725,20 +725,21 @@ static ssize_t read_file_ani(struct file *file, char __user *user_buf,
 	len += snprintf(buf+len, sizeof(buf)-len,
 			"beacon RSSI average:\t%d\n",
 			sc->ah->ah_beacon_rssi_avg.avg);
+
+#define CC_PRINT(_struct, _field) \
+	_struct._field, \
+	_struct.cycles > 0 ? \
+	_struct._field*100/_struct.cycles : 0
+
 	len += snprintf(buf+len, sizeof(buf)-len, "profcnt tx\t\t%u\t(%d%%)\n",
-			as->pfc_tx,
-			as->pfc_cycles > 0 ?
-			as->pfc_tx*100/as->pfc_cycles : 0);
+			CC_PRINT(as->last_cc, tx_frame));
 	len += snprintf(buf+len, sizeof(buf)-len, "profcnt rx\t\t%u\t(%d%%)\n",
-			as->pfc_rx,
-			as->pfc_cycles > 0 ?
-			as->pfc_rx*100/as->pfc_cycles : 0);
+			CC_PRINT(as->last_cc, rx_frame));
 	len += snprintf(buf+len, sizeof(buf)-len, "profcnt busy\t\t%u\t(%d%%)\n",
-			as->pfc_busy,
-			as->pfc_cycles > 0 ?
-			as->pfc_busy*100/as->pfc_cycles : 0);
+			CC_PRINT(as->last_cc, rx_busy));
+#undef CC_PRINT
 	len += snprintf(buf+len, sizeof(buf)-len, "profcnt cycles\t\t%u\n",
-			as->pfc_cycles);
+			as->last_cc.cycles);
 	len += snprintf(buf+len, sizeof(buf)-len,
 			"listen time\t\t%d\tlast: %d\n",
 			as->listen_time, as->last_listen);