ath9k: merge noisefloor load implementations

AR5008+ and AR9003 currently use two separate implementations of the
ath9k_hw_loadnf function. There are three main differences:

 - PHY registers for AR9003 are different
 - AR9003 always uses 3 chains, earlier versions are more selective
 - The AR9003 variant contains a fix for NF load timeouts

This patch merges the two implementations into one, storing the
register array in the ath_hw struct. The fix for NF load timeouts is
not just relevant for AR9003, but also important for earlier hardware,
so it's better to just keep one common implementation.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ar5008_phy.c

@@ -1516,77 +1516,6 @@ static void ar5008_hw_do_getnf(struct ath_hw *ah,
 	nfarray[5] = sign_extend(nf, 9);
 }
 
-static void ar5008_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
-{
-	struct ath9k_nfcal_hist *h;
-	int i, j;
-	int32_t val;
-	const u32 ar5416_cca_regs[6] = {
-		AR_PHY_CCA,
-		AR_PHY_CH1_CCA,
-		AR_PHY_CH2_CCA,
-		AR_PHY_EXT_CCA,
-		AR_PHY_CH1_EXT_CCA,
-		AR_PHY_CH2_EXT_CCA
-	};
-	u8 chainmask, rx_chain_status;
-
-	rx_chain_status = REG_READ(ah, AR_PHY_RX_CHAINMASK);
-	if (AR_SREV_9285(ah) || AR_SREV_9271(ah))
-		chainmask = 0x9;
-	else if (AR_SREV_9280(ah) || AR_SREV_9287(ah)) {
-		if ((rx_chain_status & 0x2) || (rx_chain_status & 0x4))
-			chainmask = 0x1B;
-		else
-			chainmask = 0x09;
-	} else {
-		if (rx_chain_status & 0x4)
-			chainmask = 0x3F;
-		else if (rx_chain_status & 0x2)
-			chainmask = 0x1B;
-		else
-			chainmask = 0x09;
-	}
-
-	h = ah->nfCalHist;
-
-	for (i = 0; i < NUM_NF_READINGS; i++) {
-		if (chainmask & (1 << i)) {
-			val = REG_READ(ah, ar5416_cca_regs[i]);
-			val &= 0xFFFFFE00;
-			val |= (((u32) (h[i].privNF) << 1) & 0x1ff);
-			REG_WRITE(ah, ar5416_cca_regs[i], val);
-		}
-	}
-
-	REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
-		    AR_PHY_AGC_CONTROL_ENABLE_NF);
-	REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
-		    AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
-	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
-
-	for (j = 0; j < 5; j++) {
-		if ((REG_READ(ah, AR_PHY_AGC_CONTROL) &
-		     AR_PHY_AGC_CONTROL_NF) == 0)
-			break;
-		udelay(50);
-	}
-
-	ENABLE_REGWRITE_BUFFER(ah);
-
-	for (i = 0; i < NUM_NF_READINGS; i++) {
-		if (chainmask & (1 << i)) {
-			val = REG_READ(ah, ar5416_cca_regs[i]);
-			val &= 0xFFFFFE00;
-			val |= (((u32) (-50) << 1) & 0x1ff);
-			REG_WRITE(ah, ar5416_cca_regs[i], val);
-		}
-	}
-
-	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
-}
-
 /*
  * Initialize the ANI register values with default (ini) values.
  * This routine is called during a (full) hardware reset after
@@ -1664,6 +1593,14 @@ static void ar5008_hw_set_nf_limits(struct ath_hw *ah)
 void ar5008_hw_attach_phy_ops(struct ath_hw *ah)
 {
 	struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah);
+	const u32 ar5416_cca_regs[6] = {
+		AR_PHY_CCA,
+		AR_PHY_CH1_CCA,
+		AR_PHY_CH2_CCA,
+		AR_PHY_EXT_CCA,
+		AR_PHY_CH1_EXT_CCA,
+		AR_PHY_CH2_EXT_CCA
+	};
 
 	priv_ops->rf_set_freq = ar5008_hw_set_channel;
 	priv_ops->spur_mitigate_freq = ar5008_hw_spur_mitigate;
@@ -1683,7 +1620,6 @@ void ar5008_hw_attach_phy_ops(struct ath_hw *ah)
 	priv_ops->restore_chainmask = ar5008_restore_chainmask;
 	priv_ops->set_diversity = ar5008_set_diversity;
 	priv_ops->do_getnf = ar5008_hw_do_getnf;
-	priv_ops->loadnf = ar5008_hw_loadnf;
 
 	if (modparam_force_new_ani) {
 		priv_ops->ani_control = ar5008_hw_ani_control_new;
@@ -1699,4 +1635,5 @@ void ar5008_hw_attach_phy_ops(struct ath_hw *ah)
 		priv_ops->compute_pll_control = ar5008_hw_compute_pll_control;
 
 	ar5008_hw_set_nf_limits(ah);
+	memcpy(ah->nf_regs, ar5416_cca_regs, sizeof(ah->nf_regs));
 }

drivers/net/wireless/ath/ath9k/ar9003_phy.c

@@ -1049,106 +1049,6 @@ static void ar9003_hw_set_nf_limits(struct ath_hw *ah)
 	ah->nf_5g.nominal = AR_PHY_CCA_NOM_VAL_9300_5GHZ;
 }
 
-/*
- * Find out which of the RX chains are enabled
- */
-static u32 ar9003_hw_get_rx_chainmask(struct ath_hw *ah)
-{
-	u32 chain = REG_READ(ah, AR_PHY_RX_CHAINMASK);
-	/*
-	 * The bits [2:0] indicate the rx chain mask and are to be
-	 * interpreted as follows:
-	 * 00x => Only chain 0 is enabled
-	 * 01x => Chain 1 and 0 enabled
-	 * 1xx => Chain 2,1 and 0 enabled
-	 */
-	return chain & 0x7;
-}
-
-static void ar9003_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
-{
-	struct ath9k_nfcal_hist *h;
-	unsigned i, j;
-	int32_t val;
-	const u32 ar9300_cca_regs[6] = {
-		AR_PHY_CCA_0,
-		AR_PHY_CCA_1,
-		AR_PHY_CCA_2,
-		AR_PHY_EXT_CCA,
-		AR_PHY_EXT_CCA_1,
-		AR_PHY_EXT_CCA_2,
-	};
-	u8 chainmask, rx_chain_status;
-	struct ath_common *common = ath9k_hw_common(ah);
-
-	rx_chain_status = ar9003_hw_get_rx_chainmask(ah);
-
-	chainmask = 0x3F;
-	h = ah->nfCalHist;
-
-	for (i = 0; i < NUM_NF_READINGS; i++) {
-		if (chainmask & (1 << i)) {
-			val = REG_READ(ah, ar9300_cca_regs[i]);
-			val &= 0xFFFFFE00;
-			val |= (((u32) (h[i].privNF) << 1) & 0x1ff);
-			REG_WRITE(ah, ar9300_cca_regs[i], val);
-		}
-	}
-
-	/*
-	 * Load software filtered NF value into baseband internal minCCApwr
-	 * variable.
-	 */
-	REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
-		    AR_PHY_AGC_CONTROL_ENABLE_NF);
-	REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
-		    AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
-	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
-
-	/*
-	 * Wait for load to complete, should be fast, a few 10s of us.
-	 * The max delay was changed from an original 250us to 10000us
-	 * since 250us often results in NF load timeout and causes deaf
-	 * condition during stress testing 12/12/2009
-	 */
-	for (j = 0; j < 1000; j++) {
-		if ((REG_READ(ah, AR_PHY_AGC_CONTROL) &
-		     AR_PHY_AGC_CONTROL_NF) == 0)
-			break;
-		udelay(10);
-	}
-
-	/*
-	 * We timed out waiting for the noisefloor to load, probably due to an
-	 * in-progress rx. Simply return here and allow the load plenty of time
-	 * to complete before the next calibration interval.  We need to avoid
-	 * trying to load -50 (which happens below) while the previous load is
-	 * still in progress as this can cause rx deafness. Instead by returning
-	 * here, the baseband nf cal will just be capped by our present
-	 * noisefloor until the next calibration timer.
-	 */
-	if (j == 1000) {
-		ath_print(common, ATH_DBG_ANY, "Timeout while waiting for nf "
-			  "to load: AR_PHY_AGC_CONTROL=0x%x\n",
-			  REG_READ(ah, AR_PHY_AGC_CONTROL));
-		return;
-	}
-
-	/*
-	 * Restore maxCCAPower register parameter again so that we're not capped
-	 * by the median we just loaded.  This will be initial (and max) value
-	 * of next noise floor calibration the baseband does.
-	 */
-	for (i = 0; i < NUM_NF_READINGS; i++) {
-		if (chainmask & (1 << i)) {
-			val = REG_READ(ah, ar9300_cca_regs[i]);
-			val &= 0xFFFFFE00;
-			val |= (((u32) (-50) << 1) & 0x1ff);
-			REG_WRITE(ah, ar9300_cca_regs[i], val);
-		}
-	}
-}
-
 /*
  * Initialize the ANI register values with default (ini) values.
  * This routine is called during a (full) hardware reset after
@@ -1216,6 +1116,14 @@ static void ar9003_hw_ani_cache_ini_regs(struct ath_hw *ah)
 void ar9003_hw_attach_phy_ops(struct ath_hw *ah)
 {
 	struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah);
+	const u32 ar9300_cca_regs[6] = {
+		AR_PHY_CCA_0,
+		AR_PHY_CCA_1,
+		AR_PHY_CCA_2,
+		AR_PHY_EXT_CCA,
+		AR_PHY_EXT_CCA_1,
+		AR_PHY_EXT_CCA_2,
+	};
 
 	priv_ops->rf_set_freq = ar9003_hw_set_channel;
 	priv_ops->spur_mitigate_freq = ar9003_hw_spur_mitigate;
@@ -1232,10 +1140,10 @@ void ar9003_hw_attach_phy_ops(struct ath_hw *ah)
 	priv_ops->set_diversity = ar9003_hw_set_diversity;
 	priv_ops->ani_control = ar9003_hw_ani_control;
 	priv_ops->do_getnf = ar9003_hw_do_getnf;
-	priv_ops->loadnf = ar9003_hw_loadnf;
 	priv_ops->ani_cache_ini_regs = ar9003_hw_ani_cache_ini_regs;
 
 	ar9003_hw_set_nf_limits(ah);
+	memcpy(ah->nf_regs, ar9300_cca_regs, sizeof(ah->nf_regs));
 }
 
 void ar9003_hw_bb_watchdog_config(struct ath_hw *ah)

drivers/net/wireless/ath/ath9k/calib.c

@@ -167,6 +167,100 @@ void ath9k_hw_start_nfcal(struct ath_hw *ah)
 	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
 }
 
+void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
+{
+	struct ath9k_nfcal_hist *h;
+	unsigned i, j;
+	int32_t val;
+	u8 chainmask;
+	struct ath_common *common = ath9k_hw_common(ah);
+
+	if (AR_SREV_9300_20_OR_LATER(ah))
+		chainmask = 0x3F;
+	else if (AR_SREV_9285(ah) || AR_SREV_9271(ah))
+		chainmask = 0x9;
+	else if (AR_SREV_9280(ah) || AR_SREV_9287(ah)) {
+		if ((ah->rxchainmask & 0x2) || (ah->rxchainmask & 0x4))
+			chainmask = 0x1B;
+		else
+			chainmask = 0x09;
+	} else {
+		if (ah->rxchainmask & 0x4)
+			chainmask = 0x3F;
+		else if (ah->rxchainmask & 0x2)
+			chainmask = 0x1B;
+		else
+			chainmask = 0x09;
+	}
+	h = ah->nfCalHist;
+
+	for (i = 0; i < NUM_NF_READINGS; i++) {
+		if (chainmask & (1 << i)) {
+			val = REG_READ(ah, ah->nf_regs[i]);
+			val &= 0xFFFFFE00;
+			val |= (((u32) (h[i].privNF) << 1) & 0x1ff);
+			REG_WRITE(ah, ah->nf_regs[i], val);
+		}
+	}
+
+	/*
+	 * Load software filtered NF value into baseband internal minCCApwr
+	 * variable.
+	 */
+	REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
+		    AR_PHY_AGC_CONTROL_ENABLE_NF);
+	REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
+		    AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
+	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
+
+	/*
+	 * Wait for load to complete, should be fast, a few 10s of us.
+	 * The max delay was changed from an original 250us to 10000us
+	 * since 250us often results in NF load timeout and causes deaf
+	 * condition during stress testing 12/12/2009
+	 */
+	for (j = 0; j < 1000; j++) {
+		if ((REG_READ(ah, AR_PHY_AGC_CONTROL) &
+		     AR_PHY_AGC_CONTROL_NF) == 0)
+			break;
+		udelay(10);
+	}
+
+	/*
+	 * We timed out waiting for the noisefloor to load, probably due to an
+	 * in-progress rx. Simply return here and allow the load plenty of time
+	 * to complete before the next calibration interval.  We need to avoid
+	 * trying to load -50 (which happens below) while the previous load is
+	 * still in progress as this can cause rx deafness. Instead by returning
+	 * here, the baseband nf cal will just be capped by our present
+	 * noisefloor until the next calibration timer.
+	 */
+	if (j == 1000) {
+		ath_print(common, ATH_DBG_ANY, "Timeout while waiting for nf "
+			  "to load: AR_PHY_AGC_CONTROL=0x%x\n",
+			  REG_READ(ah, AR_PHY_AGC_CONTROL));
+		return;
+	}
+
+	/*
+	 * Restore maxCCAPower register parameter again so that we're not capped
+	 * by the median we just loaded.  This will be initial (and max) value
+	 * of next noise floor calibration the baseband does.
+	 */
+	ENABLE_REGWRITE_BUFFER(ah);
+	for (i = 0; i < NUM_NF_READINGS; i++) {
+		if (chainmask & (1 << i)) {
+			val = REG_READ(ah, ah->nf_regs[i]);
+			val &= 0xFFFFFE00;
+			val |= (((u32) (-50) << 1) & 0x1ff);
+			REG_WRITE(ah, ah->nf_regs[i], val);
+		}
+	}
+	REGWRITE_BUFFER_FLUSH(ah);
+	DISABLE_REGWRITE_BUFFER(ah);
+}
+
+
 static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf)
 {
 	struct ath_common *common = ath9k_hw_common(ah);

drivers/net/wireless/ath/ath9k/calib.h

@@ -109,6 +109,7 @@ struct ath9k_pacal_info{
 
 bool ath9k_hw_reset_calvalid(struct ath_hw *ah);
 void ath9k_hw_start_nfcal(struct ath_hw *ah);
+void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan);
 int16_t ath9k_hw_getnf(struct ath_hw *ah,
 		       struct ath9k_channel *chan);
 void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah);

drivers/net/wireless/ath/ath9k/hw-ops.h

@@ -264,12 +264,6 @@ static inline void ath9k_hw_do_getnf(struct ath_hw *ah,
 	ath9k_hw_private_ops(ah)->do_getnf(ah, nfarray);
 }
 
-static inline void ath9k_hw_loadnf(struct ath_hw *ah,
-				   struct ath9k_channel *chan)
-{
-	ath9k_hw_private_ops(ah)->loadnf(ah, chan);
-}
-
 static inline bool ath9k_hw_init_cal(struct ath_hw *ah,
 				     struct ath9k_channel *chan)
 {

drivers/net/wireless/ath/ath9k/hw.h

@@ -510,7 +510,6 @@ struct ath_gen_timer_table {
  *	AR_RTC_PLL_CONTROL for a given channel
  * @setup_calibration: set up calibration
  * @iscal_supported: used to query if a type of calibration is supported
- * @loadnf: load noise floor read from each chain on the CCA registers
  *
  * @ani_reset: reset ANI parameters to default values
  * @ani_lower_immunity: lower the noise immunity level. The level controls
@@ -564,7 +563,6 @@ struct ath_hw_private_ops {
 	bool (*ani_control)(struct ath_hw *ah, enum ath9k_ani_cmd cmd,
 			    int param);
 	void (*do_getnf)(struct ath_hw *ah, int16_t nfarray[NUM_NF_READINGS]);
-	void (*loadnf)(struct ath_hw *ah, struct ath9k_channel *chan);
 
 	/* ANI */
 	void (*ani_reset)(struct ath_hw *ah, bool is_scanning);
@@ -658,6 +656,7 @@ struct ath_hw {
 	bool need_an_top2_fixup;
 	u16 tx_trig_level;
 
+	u32 nf_regs[6];
 	struct ath_nf_limits nf_2g;
 	struct ath_nf_limits nf_5g;
 	u16 rfsilent;