ath9k: Add new Atheros IEEE 802.11n driver

This adds the new mac80211 11n ath9k Atheros driver. Only STA support
is currently enabled and tested.

Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Jack Howarth <howarth@bromo.msbb.uc.edu>
Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 436 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath9k/phy.c b/drivers/net/wireless/ath9k/phy.c
new file mode 100644
index 000000000000..eb9121fdfd38
--- /dev/null
+++ b/drivers/net/wireless/ath9k/phy.c
@@ -0,0 +1,436 @@
+/*
+ * Copyright (c) 2008 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "core.h"
+#include "hw.h"
+#include "reg.h"
+#include "phy.h"
+
+void
+ath9k_hw_write_regs(struct ath_hal *ah, u32 modesIndex, u32 freqIndex,
+		    int regWrites)
+{
+	struct ath_hal_5416 *ahp = AH5416(ah);
+
+	REG_WRITE_ARRAY(&ahp->ah_iniBB_RfGain, freqIndex, regWrites);
+}
+
+bool
+ath9k_hw_set_channel(struct ath_hal *ah, struct ath9k_channel *chan)
+{
+	u32 channelSel = 0;
+	u32 bModeSynth = 0;
+	u32 aModeRefSel = 0;
+	u32 reg32 = 0;
+	u16 freq;
+	struct chan_centers centers;
+
+	ath9k_hw_get_channel_centers(ah, chan, &centers);
+	freq = centers.synth_center;
+
+	if (freq < 4800) {
+		u32 txctl;
+
+		if (((freq - 2192) % 5) == 0) {
+			channelSel = ((freq - 672) * 2 - 3040) / 10;
+			bModeSynth = 0;
+		} else if (((freq - 2224) % 5) == 0) {
+			channelSel = ((freq - 704) * 2 - 3040) / 10;
+			bModeSynth = 1;
+		} else {
+			DPRINTF(ah->ah_sc, ATH_DBG_CHANNEL,
+				 "%s: invalid channel %u MHz\n", __func__,
+				 freq);
+			return false;
+		}
+
+		channelSel = (channelSel << 2) & 0xff;
+		channelSel = ath9k_hw_reverse_bits(channelSel, 8);
+
+		txctl = REG_READ(ah, AR_PHY_CCK_TX_CTRL);
+		if (freq == 2484) {
+
+			REG_WRITE(ah, AR_PHY_CCK_TX_CTRL,
+				  txctl | AR_PHY_CCK_TX_CTRL_JAPAN);
+		} else {
+			REG_WRITE(ah, AR_PHY_CCK_TX_CTRL,
+				  txctl & ~AR_PHY_CCK_TX_CTRL_JAPAN);
+		}
+
+	} else if ((freq % 20) == 0 && freq >= 5120) {
+		channelSel =
+		    ath9k_hw_reverse_bits(((freq - 4800) / 20 << 2), 8);
+		aModeRefSel = ath9k_hw_reverse_bits(1, 2);
+	} else if ((freq % 10) == 0) {
+		channelSel =
+		    ath9k_hw_reverse_bits(((freq - 4800) / 10 << 1), 8);
+		if (AR_SREV_9100(ah) || AR_SREV_9160_10_OR_LATER(ah))
+			aModeRefSel = ath9k_hw_reverse_bits(2, 2);
+		else
+			aModeRefSel = ath9k_hw_reverse_bits(1, 2);
+	} else if ((freq % 5) == 0) {
+		channelSel = ath9k_hw_reverse_bits((freq - 4800) / 5, 8);
+		aModeRefSel = ath9k_hw_reverse_bits(1, 2);
+	} else {
+		DPRINTF(ah->ah_sc, ATH_DBG_CHANNEL,
+			 "%s: invalid channel %u MHz\n", __func__, freq);
+		return false;
+	}
+
+	reg32 =
+	    (channelSel << 8) | (aModeRefSel << 2) | (bModeSynth << 1) |
+	    (1 << 5) | 0x1;
+
+	REG_WRITE(ah, AR_PHY(0x37), reg32);
+
+	ah->ah_curchan = chan;
+
+	AH5416(ah)->ah_curchanRadIndex = -1;
+
+	return true;
+}
+
+bool
+ath9k_hw_ar9280_set_channel(struct ath_hal *ah,
+			    struct ath9k_channel *chan)
+{
+	u16 bMode, fracMode, aModeRefSel = 0;
+	u32 freq, ndiv, channelSel = 0, channelFrac = 0, reg32 = 0;
+	struct chan_centers centers;
+	u32 refDivA = 24;
+
+	ath9k_hw_get_channel_centers(ah, chan, &centers);
+	freq = centers.synth_center;
+
+	reg32 = REG_READ(ah, AR_PHY_SYNTH_CONTROL);
+	reg32 &= 0xc0000000;
+
+	if (freq < 4800) {
+		u32 txctl;
+
+		bMode = 1;
+		fracMode = 1;
+		aModeRefSel = 0;
+		channelSel = (freq * 0x10000) / 15;
+
+		txctl = REG_READ(ah, AR_PHY_CCK_TX_CTRL);
+		if (freq == 2484) {
+
+			REG_WRITE(ah, AR_PHY_CCK_TX_CTRL,
+				  txctl | AR_PHY_CCK_TX_CTRL_JAPAN);
+		} else {
+			REG_WRITE(ah, AR_PHY_CCK_TX_CTRL,
+				  txctl & ~AR_PHY_CCK_TX_CTRL_JAPAN);
+		}
+	} else {
+		bMode = 0;
+		fracMode = 0;
+
+		if ((freq % 20) == 0) {
+			aModeRefSel = 3;
+		} else if ((freq % 10) == 0) {
+			aModeRefSel = 2;
+		} else {
+			aModeRefSel = 0;
+
+			fracMode = 1;
+			refDivA = 1;
+			channelSel = (freq * 0x8000) / 15;
+
+			REG_RMW_FIELD(ah, AR_AN_SYNTH9,
+				      AR_AN_SYNTH9_REFDIVA, refDivA);
+		}
+		if (!fracMode) {
+			ndiv = (freq * (refDivA >> aModeRefSel)) / 60;
+			channelSel = ndiv & 0x1ff;
+			channelFrac = (ndiv & 0xfffffe00) * 2;
+			channelSel = (channelSel << 17) | channelFrac;
+		}
+	}
+
+	reg32 = reg32 |
+	    (bMode << 29) |
+	    (fracMode << 28) | (aModeRefSel << 26) | (channelSel);
+
+	REG_WRITE(ah, AR_PHY_SYNTH_CONTROL, reg32);
+
+	ah->ah_curchan = chan;
+
+	AH5416(ah)->ah_curchanRadIndex = -1;
+
+	return true;
+}
+
+static void
+ath9k_phy_modify_rx_buffer(u32 *rfBuf, u32 reg32,
+			   u32 numBits, u32 firstBit,
+			   u32 column)
+{
+	u32 tmp32, mask, arrayEntry, lastBit;
+	int32_t bitPosition, bitsLeft;
+
+	tmp32 = ath9k_hw_reverse_bits(reg32, numBits);
+	arrayEntry = (firstBit - 1) / 8;
+	bitPosition = (firstBit - 1) % 8;
+	bitsLeft = numBits;
+	while (bitsLeft > 0) {
+		lastBit = (bitPosition + bitsLeft > 8) ?
+		    8 : bitPosition + bitsLeft;
+		mask = (((1 << lastBit) - 1) ^ ((1 << bitPosition) - 1)) <<
+		    (column * 8);
+		rfBuf[arrayEntry] &= ~mask;
+		rfBuf[arrayEntry] |= ((tmp32 << bitPosition) <<
+				      (column * 8)) & mask;
+		bitsLeft -= 8 - bitPosition;
+		tmp32 = tmp32 >> (8 - bitPosition);
+		bitPosition = 0;
+		arrayEntry++;
+	}
+}
+
+bool
+ath9k_hw_set_rf_regs(struct ath_hal *ah, struct ath9k_channel *chan,
+		     u16 modesIndex)
+{
+	struct ath_hal_5416 *ahp = AH5416(ah);
+
+	u32 eepMinorRev;
+	u32 ob5GHz = 0, db5GHz = 0;
+	u32 ob2GHz = 0, db2GHz = 0;
+	int regWrites = 0;
+
+	if (AR_SREV_9280_10_OR_LATER(ah))
+		return true;
+
+	eepMinorRev = ath9k_hw_get_eeprom(ahp, EEP_MINOR_REV);
+
+	RF_BANK_SETUP(ahp->ah_analogBank0Data, &ahp->ah_iniBank0, 1);
+
+	RF_BANK_SETUP(ahp->ah_analogBank1Data, &ahp->ah_iniBank1, 1);
+
+	RF_BANK_SETUP(ahp->ah_analogBank2Data, &ahp->ah_iniBank2, 1);
+
+	RF_BANK_SETUP(ahp->ah_analogBank3Data, &ahp->ah_iniBank3,
+		      modesIndex);
+	{
+		int i;
+		for (i = 0; i < ahp->ah_iniBank6TPC.ia_rows; i++) {
+			ahp->ah_analogBank6Data[i] =
+			    INI_RA(&ahp->ah_iniBank6TPC, i, modesIndex);
+		}
+	}
+
+	if (eepMinorRev >= 2) {
+		if (IS_CHAN_2GHZ(chan)) {
+			ob2GHz = ath9k_hw_get_eeprom(ahp, EEP_OB_2);
+			db2GHz = ath9k_hw_get_eeprom(ahp, EEP_DB_2);
+			ath9k_phy_modify_rx_buffer(ahp->ah_analogBank6Data,
+						   ob2GHz, 3, 197, 0);
+			ath9k_phy_modify_rx_buffer(ahp->ah_analogBank6Data,
+						   db2GHz, 3, 194, 0);
+		} else {
+			ob5GHz = ath9k_hw_get_eeprom(ahp, EEP_OB_5);
+			db5GHz = ath9k_hw_get_eeprom(ahp, EEP_DB_5);
+			ath9k_phy_modify_rx_buffer(ahp->ah_analogBank6Data,
+						   ob5GHz, 3, 203, 0);
+			ath9k_phy_modify_rx_buffer(ahp->ah_analogBank6Data,
+						   db5GHz, 3, 200, 0);
+		}
+	}
+
+	RF_BANK_SETUP(ahp->ah_analogBank7Data, &ahp->ah_iniBank7, 1);
+
+	REG_WRITE_RF_ARRAY(&ahp->ah_iniBank0, ahp->ah_analogBank0Data,
+			   regWrites);
+	REG_WRITE_RF_ARRAY(&ahp->ah_iniBank1, ahp->ah_analogBank1Data,
+			   regWrites);
+	REG_WRITE_RF_ARRAY(&ahp->ah_iniBank2, ahp->ah_analogBank2Data,
+			   regWrites);
+	REG_WRITE_RF_ARRAY(&ahp->ah_iniBank3, ahp->ah_analogBank3Data,
+			   regWrites);
+	REG_WRITE_RF_ARRAY(&ahp->ah_iniBank6TPC, ahp->ah_analogBank6Data,
+			   regWrites);
+	REG_WRITE_RF_ARRAY(&ahp->ah_iniBank7, ahp->ah_analogBank7Data,
+			   regWrites);
+
+	return true;
+}
+
+void
+ath9k_hw_rfdetach(struct ath_hal *ah)
+{
+	struct ath_hal_5416 *ahp = AH5416(ah);
+
+	if (ahp->ah_analogBank0Data != NULL) {
+		kfree(ahp->ah_analogBank0Data);
+		ahp->ah_analogBank0Data = NULL;
+	}
+	if (ahp->ah_analogBank1Data != NULL) {
+		kfree(ahp->ah_analogBank1Data);
+		ahp->ah_analogBank1Data = NULL;
+	}
+	if (ahp->ah_analogBank2Data != NULL) {
+		kfree(ahp->ah_analogBank2Data);
+		ahp->ah_analogBank2Data = NULL;
+	}
+	if (ahp->ah_analogBank3Data != NULL) {
+		kfree(ahp->ah_analogBank3Data);
+		ahp->ah_analogBank3Data = NULL;
+	}
+	if (ahp->ah_analogBank6Data != NULL) {
+		kfree(ahp->ah_analogBank6Data);
+		ahp->ah_analogBank6Data = NULL;
+	}
+	if (ahp->ah_analogBank6TPCData != NULL) {
+		kfree(ahp->ah_analogBank6TPCData);
+		ahp->ah_analogBank6TPCData = NULL;
+	}
+	if (ahp->ah_analogBank7Data != NULL) {
+		kfree(ahp->ah_analogBank7Data);
+		ahp->ah_analogBank7Data = NULL;
+	}
+	if (ahp->ah_addac5416_21 != NULL) {
+		kfree(ahp->ah_addac5416_21);
+		ahp->ah_addac5416_21 = NULL;
+	}
+	if (ahp->ah_bank6Temp != NULL) {
+		kfree(ahp->ah_bank6Temp);
+		ahp->ah_bank6Temp = NULL;
+	}
+}
+
+bool ath9k_hw_init_rf(struct ath_hal *ah, int *status)
+{
+	struct ath_hal_5416 *ahp = AH5416(ah);
+
+	if (!AR_SREV_9280_10_OR_LATER(ah)) {
+
+		ahp->ah_analogBank0Data =
+		    kzalloc((sizeof(u32) *
+			     ahp->ah_iniBank0.ia_rows), GFP_KERNEL);
+		ahp->ah_analogBank1Data =
+		    kzalloc((sizeof(u32) *
+			     ahp->ah_iniBank1.ia_rows), GFP_KERNEL);
+		ahp->ah_analogBank2Data =
+		    kzalloc((sizeof(u32) *
+			     ahp->ah_iniBank2.ia_rows), GFP_KERNEL);
+		ahp->ah_analogBank3Data =
+		    kzalloc((sizeof(u32) *
+			     ahp->ah_iniBank3.ia_rows), GFP_KERNEL);
+		ahp->ah_analogBank6Data =
+		    kzalloc((sizeof(u32) *
+			     ahp->ah_iniBank6.ia_rows), GFP_KERNEL);
+		ahp->ah_analogBank6TPCData =
+		    kzalloc((sizeof(u32) *
+			     ahp->ah_iniBank6TPC.ia_rows), GFP_KERNEL);
+		ahp->ah_analogBank7Data =
+		    kzalloc((sizeof(u32) *
+			     ahp->ah_iniBank7.ia_rows), GFP_KERNEL);
+
+		if (ahp->ah_analogBank0Data == NULL
+		    || ahp->ah_analogBank1Data == NULL
+		    || ahp->ah_analogBank2Data == NULL
+		    || ahp->ah_analogBank3Data == NULL
+		    || ahp->ah_analogBank6Data == NULL
+		    || ahp->ah_analogBank6TPCData == NULL
+		    || ahp->ah_analogBank7Data == NULL) {
+			DPRINTF(ah->ah_sc, ATH_DBG_FATAL,
+				 "%s: cannot allocate RF banks\n",
+				 __func__);
+			*status = -ENOMEM;
+			return false;
+		}
+
+		ahp->ah_addac5416_21 =
+		    kzalloc((sizeof(u32) *
+			     ahp->ah_iniAddac.ia_rows *
+			     ahp->ah_iniAddac.ia_columns), GFP_KERNEL);
+		if (ahp->ah_addac5416_21 == NULL) {
+			DPRINTF(ah->ah_sc, ATH_DBG_FATAL,
+				 "%s: cannot allocate ah_addac5416_21\n",
+				 __func__);
+			*status = -ENOMEM;
+			return false;
+		}
+
+		ahp->ah_bank6Temp =
+		    kzalloc((sizeof(u32) *
+			     ahp->ah_iniBank6.ia_rows), GFP_KERNEL);
+		if (ahp->ah_bank6Temp == NULL) {
+			DPRINTF(ah->ah_sc, ATH_DBG_FATAL,
+				 "%s: cannot allocate ah_bank6Temp\n",
+				 __func__);
+			*status = -ENOMEM;
+			return false;
+		}
+	}
+
+	return true;
+}
+
+void
+ath9k_hw_decrease_chain_power(struct ath_hal *ah, struct ath9k_channel *chan)
+{
+	int i, regWrites = 0;
+	struct ath_hal_5416 *ahp = AH5416(ah);
+	u32 bank6SelMask;
+	u32 *bank6Temp = ahp->ah_bank6Temp;
+
+	switch (ahp->ah_diversityControl) {
+	case ATH9K_ANT_FIXED_A:
+		bank6SelMask =
+		    (ahp->
+		     ah_antennaSwitchSwap & ANTSWAP_AB) ? REDUCE_CHAIN_0 :
+		    REDUCE_CHAIN_1;
+		break;
+	case ATH9K_ANT_FIXED_B:
+		bank6SelMask =
+		    (ahp->
+		     ah_antennaSwitchSwap & ANTSWAP_AB) ? REDUCE_CHAIN_1 :
+		    REDUCE_CHAIN_0;
+		break;
+	case ATH9K_ANT_VARIABLE:
+		return;
+		break;
+	default:
+		return;
+		break;
+	}
+
+	for (i = 0; i < ahp->ah_iniBank6.ia_rows; i++)
+		bank6Temp[i] = ahp->ah_analogBank6Data[i];
+
+	REG_WRITE(ah, AR_PHY_BASE + 0xD8, bank6SelMask);
+
+	ath9k_phy_modify_rx_buffer(bank6Temp, 1, 1, 189, 0);
+	ath9k_phy_modify_rx_buffer(bank6Temp, 1, 1, 190, 0);
+	ath9k_phy_modify_rx_buffer(bank6Temp, 1, 1, 191, 0);
+	ath9k_phy_modify_rx_buffer(bank6Temp, 1, 1, 192, 0);
+	ath9k_phy_modify_rx_buffer(bank6Temp, 1, 1, 193, 0);
+	ath9k_phy_modify_rx_buffer(bank6Temp, 1, 1, 222, 0);
+	ath9k_phy_modify_rx_buffer(bank6Temp, 1, 1, 245, 0);
+	ath9k_phy_modify_rx_buffer(bank6Temp, 1, 1, 246, 0);
+	ath9k_phy_modify_rx_buffer(bank6Temp, 1, 1, 247, 0);
+
+	REG_WRITE_RF_ARRAY(&ahp->ah_iniBank6, bank6Temp, regWrites);
+
+	REG_WRITE(ah, AR_PHY_BASE + 0xD8, 0x00000053);
+#ifdef ALTER_SWITCH
+	REG_WRITE(ah, PHY_SWITCH_CHAIN_0,
+		  (REG_READ(ah, PHY_SWITCH_CHAIN_0) & ~0x38)
+		  | ((REG_READ(ah, PHY_SWITCH_CHAIN_0) >> 3) & 0x38));
+#endif
+}