rt2x00: Split rt61/rt73 antenna selection into RX and TX antenna

Based on investigation of the legacy drivers, I have made the
following assumptions of the antenna setup:
 - R77 is the TX antenna configuration
 - RF2529 fetches default antenna selection from NIC eeprom word

With these assumptions we can change the antenna configuration
to correctly read both antenna setup values and correctly
configure the antenna. And we can now also configure the antenna
for RF2529 without a double antenna.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 141 insertions, 74 deletions

diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index c57d39002bf..7c97761034e 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -424,6 +424,29 @@ static void rt61pci_config_antenna_5x(struct rt2x00_dev *rt2x00dev,
 	rt2x00_set_field8(&r3, BBP_R3_SMART_MODE,
 			  !rt2x00_rf(&rt2x00dev->chip, RF5225));
 
+	/*
+	 * Configure the TX antenna.
+	 */
+	switch (ant->tx) {
+	case ANTENNA_A:
+		rt2x00_set_field8(&r77, BBP_R77_TX_ANTENNA, 0);
+		break;
+	case ANTENNA_SW_DIVERSITY:
+	case ANTENNA_HW_DIVERSITY:
+		/*
+		 * NOTE: We should never come here because rt2x00lib is
+		 * supposed to catch this and send us the correct antenna
+		 * explicitely. However we are nog going to bug about this.
+		 * Instead, just default to antenna B.
+		 */
+	case ANTENNA_B:
+		rt2x00_set_field8(&r77, BBP_R77_TX_ANTENNA, 3);
+		break;
+	}
+
+	/*
+	 * Configure the RX antenna.
+	 */
 	switch (ant->rx) {
 	case ANTENNA_HW_DIVERSITY:
 		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 2);
@@ -433,11 +456,6 @@ static void rt61pci_config_antenna_5x(struct rt2x00_dev *rt2x00dev,
 	case ANTENNA_A:
 		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
 		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);
-
-		if (rt2x00dev->curr_hwmode == HWMODE_A)
-			rt2x00_set_field8(&r77, BBP_R77_PAIR, 0);
-		else
-			rt2x00_set_field8(&r77, BBP_R77_PAIR, 3);
 		break;
 	case ANTENNA_SW_DIVERSITY:
 		/*
@@ -449,11 +467,6 @@ static void rt61pci_config_antenna_5x(struct rt2x00_dev *rt2x00dev,
 	case ANTENNA_B:
 		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
 		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);
-
-		if (rt2x00dev->curr_hwmode == HWMODE_A)
-			rt2x00_set_field8(&r77, BBP_R77_PAIR, 3);
-		else
-			rt2x00_set_field8(&r77, BBP_R77_PAIR, 0);
 		break;
 	}
 
@@ -478,13 +491,35 @@ static void rt61pci_config_antenna_2x(struct rt2x00_dev *rt2x00dev,
 	rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END,
 			  !test_bit(CONFIG_FRAME_TYPE, &rt2x00dev->flags));
 
+	/*
+	 * Configure the TX antenna.
+	 */
+	switch (ant->tx) {
+	case ANTENNA_A:
+		rt2x00_set_field8(&r77, BBP_R77_TX_ANTENNA, 0);
+		break;
+	case ANTENNA_SW_DIVERSITY:
+	case ANTENNA_HW_DIVERSITY:
+		/*
+		 * NOTE: We should never come here because rt2x00lib is
+		 * supposed to catch this and send us the correct antenna
+		 * explicitely. However we are nog going to bug about this.
+		 * Instead, just default to antenna B.
+		 */
+	case ANTENNA_B:
+		rt2x00_set_field8(&r77, BBP_R77_TX_ANTENNA, 3);
+		break;
+	}
+
+	/*
+	 * Configure the RX antenna.
+	 */
 	switch (ant->rx) {
 	case ANTENNA_HW_DIVERSITY:
 		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 2);
 		break;
 	case ANTENNA_A:
 		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
-		rt2x00_set_field8(&r77, BBP_R77_PAIR, 3);
 		break;
 	case ANTENNA_SW_DIVERSITY:
 		/*
@@ -495,7 +530,6 @@ static void rt61pci_config_antenna_2x(struct rt2x00_dev *rt2x00dev,
 		 */
 	case ANTENNA_B:
 		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
-		rt2x00_set_field8(&r77, BBP_R77_PAIR, 0);
 		break;
 	}
 
@@ -530,74 +564,75 @@ static void rt61pci_config_antenna_2529(struct rt2x00_dev *rt2x00dev,
 	u8 r3;
 	u8 r4;
 	u8 r77;
+	u8 rx_ant;
 
 	rt61pci_bbp_read(rt2x00dev, 3, &r3);
 	rt61pci_bbp_read(rt2x00dev, 4, &r4);
 	rt61pci_bbp_read(rt2x00dev, 77, &r77);
+
 	rt2x00_eeprom_read(rt2x00dev, EEPROM_NIC, &eeprom);
+	rx_ant = !!(rt2x00_get_field16(eeprom, EEPROM_NIC_TX_RX_FIXED) & 2);
 
 	rt2x00_set_field8(&r3, BBP_R3_SMART_MODE, 0);
 
-	if (rt2x00_get_field16(eeprom, EEPROM_NIC_ENABLE_DIVERSITY) &&
-	    rt2x00_get_field16(eeprom, EEPROM_NIC_TX_DIVERSITY)) {
-		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 2);
-		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 1);
-		rt61pci_config_antenna_2529_rx(rt2x00dev, 0, 1);
-	} else if (rt2x00_get_field16(eeprom, EEPROM_NIC_ENABLE_DIVERSITY)) {
-		if (rt2x00_get_field16(eeprom, EEPROM_NIC_TX_RX_FIXED) >= 2) {
-			rt2x00_set_field8(&r77, BBP_R77_PAIR, 3);
-			rt61pci_bbp_write(rt2x00dev, 77, r77);
-		}
-		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
-		rt61pci_config_antenna_2529_rx(rt2x00dev, 1, 1);
-	} else if (!rt2x00_get_field16(eeprom, EEPROM_NIC_ENABLE_DIVERSITY) &&
-		   rt2x00_get_field16(eeprom, EEPROM_NIC_TX_DIVERSITY)) {
-		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 2);
-		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);
+	/*
+	 * Configure the TX antenna.
+	 */
+	switch (ant->tx) {
+	case ANTENNA_A:
+		rt2x00_set_field8(&r77, BBP_R77_TX_ANTENNA, 0);
+		break;
+	case ANTENNA_SW_DIVERSITY:
+	case ANTENNA_HW_DIVERSITY:
+		/*
+		 * NOTE: We should never come here because rt2x00lib is
+		 * supposed to catch this and send us the correct antenna
+		 * explicitely. However we are nog going to bug about this.
+		 * Instead, just default to antenna B.
+		 */
+	case ANTENNA_B:
+		rt2x00_set_field8(&r77, BBP_R77_TX_ANTENNA, 3);
+		break;
+	}
 
-		switch (rt2x00_get_field16(eeprom, EEPROM_NIC_TX_RX_FIXED)) {
-		case 0:
-			rt61pci_config_antenna_2529_rx(rt2x00dev, 0, 1);
-			break;
-		case 1:
-			rt61pci_config_antenna_2529_rx(rt2x00dev, 1, 0);
-			break;
-		case 2:
-			rt61pci_config_antenna_2529_rx(rt2x00dev, 0, 0);
-			break;
-		case 3:
-			rt61pci_config_antenna_2529_rx(rt2x00dev, 1, 1);
-			break;
-		}
-	} else if (!rt2x00_get_field16(eeprom, EEPROM_NIC_ENABLE_DIVERSITY) &&
-		   !rt2x00_get_field16(eeprom, EEPROM_NIC_TX_DIVERSITY)) {
+	/*
+	 * Configure the RX antenna.
+	 */
+	switch (ant->rx) {
+	case ANTENNA_A:
+		rt61pci_config_antenna_2529_rx(rt2x00dev, 0, rx_ant);
+		break;
+	case ANTENNA_SW_DIVERSITY:
+	case ANTENNA_HW_DIVERSITY:
+		/*
+		 * NOTE: We should never come here because rt2x00lib is
+		 * supposed to catch this and send us the correct antenna
+		 * explicitely. However we are nog going to bug about this.
+		 * Instead, just default to antenna B.
+		 */
+	case ANTENNA_B:
+		rt61pci_config_antenna_2529_rx(rt2x00dev, 1, rx_ant);
+		break;
+	}
+
+	/*
+	 * FIXME: We are using the default antenna setup to
+	 * determine the remaining settings. This because we
+	 * need to know what the EEPROM indicated.
+	 * It is however unclear if this is required, and overall
+	 * using the default antenna settings here is incorrect
+	 * since mac80211 might have told us to use fixed settings.
+	 */
+	if (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
+		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 2);
+	else
 		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
-		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);
 
-		switch (rt2x00_get_field16(eeprom, EEPROM_NIC_TX_RX_FIXED)) {
-		case 0:
-			rt2x00_set_field8(&r77, BBP_R77_PAIR, 0);
-			rt61pci_bbp_write(rt2x00dev, 77, r77);
-			rt61pci_config_antenna_2529_rx(rt2x00dev, 0, 1);
-			break;
-		case 1:
-			rt2x00_set_field8(&r77, BBP_R77_PAIR, 0);
-			rt61pci_bbp_write(rt2x00dev, 77, r77);
-			rt61pci_config_antenna_2529_rx(rt2x00dev, 1, 0);
-			break;
-		case 2:
-			rt2x00_set_field8(&r77, BBP_R77_PAIR, 3);
-			rt61pci_bbp_write(rt2x00dev, 77, r77);
-			rt61pci_config_antenna_2529_rx(rt2x00dev, 0, 0);
-			break;
-		case 3:
-			rt2x00_set_field8(&r77, BBP_R77_PAIR, 3);
-			rt61pci_bbp_write(rt2x00dev, 77, r77);
-			rt61pci_config_antenna_2529_rx(rt2x00dev, 1, 1);
-			break;
-		}
-	}
+	rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END,
+			  (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY) &&
+			  (rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY));
 
+	rt61pci_bbp_write(rt2x00dev, 77, r77);
 	rt61pci_bbp_write(rt2x00dev, 3, r3);
 	rt61pci_bbp_write(rt2x00dev, 4, r4);
 }
@@ -2031,6 +2066,12 @@ static int rt61pci_init_eeprom(struct rt2x00_dev *rt2x00dev)
 	}
 
 	/*
+	 * Determine number of antenna's.
+	 */
+	if (rt2x00_get_field16(eeprom, EEPROM_ANTENNA_NUM) == 2)
+		__set_bit(CONFIG_DOUBLE_ANTENNA, &rt2x00dev->flags);
+
+	/*
 	 * Identify default antenna configuration.
 	 */
 	rt2x00dev->default_ant.tx =
@@ -2045,12 +2086,6 @@ static int rt61pci_init_eeprom(struct rt2x00_dev *rt2x00dev)
 		__set_bit(CONFIG_FRAME_TYPE, &rt2x00dev->flags);
 
 	/*
-	 * Determine number of antenna's.
-	 */
-	if (rt2x00_get_field16(eeprom, EEPROM_ANTENNA_NUM) == 2)
-		__set_bit(CONFIG_DOUBLE_ANTENNA, &rt2x00dev->flags);
-
-	/*
 	 * Detect if this device has an hardware controlled radio.
 	 */
 #ifdef CONFIG_RT61PCI_RFKILL
@@ -2078,6 +2113,38 @@ static int rt61pci_init_eeprom(struct rt2x00_dev *rt2x00dev)
 		__set_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags);
 
 	/*
+	 * When working with a RF2529 chip without double antenna
+	 * the antenna settings should be gathered from the NIC
+	 * eeprom word.
+	 */
+	if (rt2x00_rf(&rt2x00dev->chip, RF2529) &&
+	    !test_bit(CONFIG_DOUBLE_ANTENNA, &rt2x00dev->flags)) {
+		switch (rt2x00_get_field16(eeprom, EEPROM_NIC_TX_RX_FIXED)) {
+		case 0:
+			rt2x00dev->default_ant.tx = ANTENNA_B;
+			rt2x00dev->default_ant.rx = ANTENNA_A;
+			break;
+		case 1:
+			rt2x00dev->default_ant.tx = ANTENNA_B;
+			rt2x00dev->default_ant.rx = ANTENNA_B;
+			break;
+		case 2:
+			rt2x00dev->default_ant.tx = ANTENNA_A;
+			rt2x00dev->default_ant.rx = ANTENNA_A;
+			break;
+		case 3:
+			rt2x00dev->default_ant.tx = ANTENNA_A;
+			rt2x00dev->default_ant.rx = ANTENNA_B;
+			break;
+		}
+
+		if (rt2x00_get_field16(eeprom, EEPROM_NIC_TX_DIVERSITY))
+			rt2x00dev->default_ant.tx = ANTENNA_SW_DIVERSITY;
+		if (rt2x00_get_field16(eeprom, EEPROM_NIC_ENABLE_DIVERSITY))
+			rt2x00dev->default_ant.rx = ANTENNA_SW_DIVERSITY;
+	}
+
+	/*
 	 * Store led settings, for correct led behaviour.
 	 * If the eeprom value is invalid,
 	 * switch to default led mode.