1 files changed, 499 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2_phy.c b/drivers/net/wireless/mediatek/mt76/mt76x2_phy.c
new file mode 100644
index 0000000..84c96c0
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2_phy.c
@@ -0,0 +1,499 @@
+/*
+ * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
+ *
+ * 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 <linux/delay.h>
+#include "mt76x2.h"
+#include "mt76x2_mcu.h"
+#include "mt76x2_eeprom.h"
+
+static bool
+mt76x2_phy_tssi_init_cal(struct mt76x2_dev *dev)
+{
+	struct ieee80211_channel *chan = dev->mt76.chandef.chan;
+	u32 flag = 0;
+
+	if (!mt76x2_tssi_enabled(dev))
+		return false;
+
+	if (mt76x2_channel_silent(dev))
+		return false;
+
+	if (chan->band == NL80211_BAND_5GHZ)
+		flag |= BIT(0);
+
+	if (mt76x2_ext_pa_enabled(dev, chan->band))
+		flag |= BIT(8);
+
+	mt76x2_mcu_calibrate(dev, MCU_CAL_TSSI, flag);
+	dev->cal.tssi_cal_done = true;
+	return true;
+}
+
+static void
+mt76x2_phy_channel_calibrate(struct mt76x2_dev *dev, bool mac_stopped)
+{
+	struct ieee80211_channel *chan = dev->mt76.chandef.chan;
+	bool is_5ghz = chan->band == NL80211_BAND_5GHZ;
+
+	if (dev->cal.channel_cal_done)
+		return;
+
+	if (mt76x2_channel_silent(dev))
+		return;
+
+	if (!dev->cal.tssi_cal_done)
+		mt76x2_phy_tssi_init_cal(dev);
+
+	if (!mac_stopped)
+		mt76x2_mac_stop(dev, false);
+
+	if (is_5ghz)
+		mt76x2_mcu_calibrate(dev, MCU_CAL_LC, 0);
+
+	mt76x2_mcu_calibrate(dev, MCU_CAL_TX_LOFT, is_5ghz);
+	mt76x2_mcu_calibrate(dev, MCU_CAL_TXIQ, is_5ghz);
+	mt76x2_mcu_calibrate(dev, MCU_CAL_RXIQC_FI, is_5ghz);
+	mt76x2_mcu_calibrate(dev, MCU_CAL_TEMP_SENSOR, 0);
+	mt76x2_mcu_calibrate(dev, MCU_CAL_TX_SHAPING, 0);
+
+	if (!mac_stopped)
+		mt76x2_mac_resume(dev);
+
+	mt76x2_apply_gain_adj(dev);
+
+	dev->cal.channel_cal_done = true;
+}
+
+void mt76x2_phy_set_antenna(struct mt76x2_dev *dev)
+{
+	u32 val;
+
+	val = mt76_rr(dev, MT_BBP(AGC, 0));
+	val &= ~(BIT(4) | BIT(1));
+	switch (dev->mt76.antenna_mask) {
+	case 1:
+		/* disable mac DAC control */
+		mt76_clear(dev, MT_BBP(IBI, 9), BIT(11));
+		mt76_clear(dev, MT_BBP(TXBE, 5), 3);
+		mt76_rmw_field(dev, MT_TX_PIN_CFG, MT_TX_PIN_CFG_TXANT, 0x3);
+		mt76_rmw_field(dev, MT_BBP(CORE, 32), GENMASK(21, 20), 2);
+		/* disable DAC 1 */
+		mt76_rmw_field(dev, MT_BBP(CORE, 33), GENMASK(12, 9), 4);
+
+		val &= ~(BIT(3) | BIT(0));
+		break;
+	case 2:
+		/* disable mac DAC control */
+		mt76_clear(dev, MT_BBP(IBI, 9), BIT(11));
+		mt76_rmw_field(dev, MT_BBP(TXBE, 5), 3, 1);
+		mt76_rmw_field(dev, MT_TX_PIN_CFG, MT_TX_PIN_CFG_TXANT, 0xc);
+		mt76_rmw_field(dev, MT_BBP(CORE, 32), GENMASK(21, 20), 1);
+		/* disable DAC 0 */
+		mt76_rmw_field(dev, MT_BBP(CORE, 33), GENMASK(12, 9), 1);
+
+		val &= ~BIT(3);
+		val |= BIT(0);
+		break;
+	case 3:
+	default:
+		/* enable mac DAC control */
+		mt76_set(dev, MT_BBP(IBI, 9), BIT(11));
+		mt76_set(dev, MT_BBP(TXBE, 5), 3);
+		mt76_rmw_field(dev, MT_TX_PIN_CFG, MT_TX_PIN_CFG_TXANT, 0xf);
+		mt76_clear(dev, MT_BBP(CORE, 32), GENMASK(21, 20));
+		mt76_clear(dev, MT_BBP(CORE, 33), GENMASK(12, 9));
+
+		val &= ~BIT(0);
+		val |= BIT(3);
+		break;
+	}
+	mt76_wr(dev, MT_BBP(AGC, 0), val);
+}
+
+static void
+mt76x2_get_agc_gain(struct mt76x2_dev *dev, u8 *dest)
+{
+	dest[0] = mt76_get_field(dev, MT_BBP(AGC, 8), MT_BBP_AGC_GAIN);
+	dest[1] = mt76_get_field(dev, MT_BBP(AGC, 9), MT_BBP_AGC_GAIN);
+}
+
+static int
+mt76x2_get_rssi_gain_thresh(struct mt76x2_dev *dev)
+{
+	switch (dev->mt76.chandef.width) {
+	case NL80211_CHAN_WIDTH_80:
+		return -62;
+	case NL80211_CHAN_WIDTH_40:
+		return -65;
+	default:
+		return -68;
+	}
+}
+
+static int
+mt76x2_get_low_rssi_gain_thresh(struct mt76x2_dev *dev)
+{
+	switch (dev->mt76.chandef.width) {
+	case NL80211_CHAN_WIDTH_80:
+		return -76;
+	case NL80211_CHAN_WIDTH_40:
+		return -79;
+	default:
+		return -82;
+	}
+}
+
+static void
+mt76x2_phy_set_gain_val(struct mt76x2_dev *dev)
+{
+	u32 val;
+	u8 gain_val[2];
+
+	gain_val[0] = dev->cal.agc_gain_cur[0] - dev->cal.agc_gain_adjust;
+	gain_val[1] = dev->cal.agc_gain_cur[1] - dev->cal.agc_gain_adjust;
+
+	if (dev->mt76.chandef.width >= NL80211_CHAN_WIDTH_40)
+		val = 0x1e42 << 16;
+	else
+		val = 0x1836 << 16;
+
+	val |= 0xf8;
+
+	mt76_wr(dev, MT_BBP(AGC, 8),
+		val | FIELD_PREP(MT_BBP_AGC_GAIN, gain_val[0]));
+	mt76_wr(dev, MT_BBP(AGC, 9),
+		val | FIELD_PREP(MT_BBP_AGC_GAIN, gain_val[1]));
+
+	if (dev->mt76.chandef.chan->flags & IEEE80211_CHAN_RADAR)
+		mt76x2_dfs_adjust_agc(dev);
+}
+
+static void
+mt76x2_phy_adjust_vga_gain(struct mt76x2_dev *dev)
+{
+	u32 false_cca;
+	u8 limit = dev->cal.low_gain > 0 ? 16 : 4;
+
+	false_cca = FIELD_GET(MT_RX_STAT_1_CCA_ERRORS, mt76_rr(dev, MT_RX_STAT_1));
+	dev->cal.false_cca = false_cca;
+	if (false_cca > 800 && dev->cal.agc_gain_adjust < limit)
+		dev->cal.agc_gain_adjust += 2;
+	else if ((false_cca < 10 && dev->cal.agc_gain_adjust > 0) ||
+		 (dev->cal.agc_gain_adjust >= limit && false_cca < 500))
+		dev->cal.agc_gain_adjust -= 2;
+	else
+		return;
+
+	mt76x2_phy_set_gain_val(dev);
+}
+
+static void
+mt76x2_phy_update_channel_gain(struct mt76x2_dev *dev)
+{
+	u8 *gain = dev->cal.agc_gain_init;
+	u8 low_gain_delta, gain_delta;
+	bool gain_change;
+	int low_gain;
+	u32 val;
+
+	dev->cal.avg_rssi_all = mt76x2_phy_get_min_avg_rssi(dev);
+
+	low_gain = (dev->cal.avg_rssi_all > mt76x2_get_rssi_gain_thresh(dev)) +
+		   (dev->cal.avg_rssi_all > mt76x2_get_low_rssi_gain_thresh(dev));
+
+	gain_change = (dev->cal.low_gain & 2) ^ (low_gain & 2);
+	dev->cal.low_gain = low_gain;
+
+	if (!gain_change) {
+		mt76x2_phy_adjust_vga_gain(dev);
+		return;
+	}
+
+	if (dev->mt76.chandef.width == NL80211_CHAN_WIDTH_80) {
+		mt76_wr(dev, MT_BBP(RXO, 14), 0x00560211);
+		val = mt76_rr(dev, MT_BBP(AGC, 26)) & ~0xf;
+		if (low_gain == 2)
+			val |= 0x3;
+		else
+			val |= 0x5;
+		mt76_wr(dev, MT_BBP(AGC, 26), val);
+	} else {
+		mt76_wr(dev, MT_BBP(RXO, 14), 0x00560423);
+	}
+
+	if (mt76x2_has_ext_lna(dev))
+		low_gain_delta = 10;
+	else
+		low_gain_delta = 14;
+
+	if (low_gain == 2) {
+		mt76_wr(dev, MT_BBP(RXO, 18), 0xf000a990);
+		mt76_wr(dev, MT_BBP(AGC, 35), 0x08080808);
+		mt76_wr(dev, MT_BBP(AGC, 37), 0x08080808);
+		gain_delta = low_gain_delta;
+		dev->cal.agc_gain_adjust = 0;
+	} else {
+		mt76_wr(dev, MT_BBP(RXO, 18), 0xf000a991);
+		if (dev->mt76.chandef.width == NL80211_CHAN_WIDTH_80)
+			mt76_wr(dev, MT_BBP(AGC, 35), 0x10101014);
+		else
+			mt76_wr(dev, MT_BBP(AGC, 35), 0x11111116);
+		mt76_wr(dev, MT_BBP(AGC, 37), 0x2121262C);
+		gain_delta = 0;
+		dev->cal.agc_gain_adjust = low_gain_delta;
+	}
+
+	dev->cal.agc_gain_cur[0] = gain[0] - gain_delta;
+	dev->cal.agc_gain_cur[1] = gain[1] - gain_delta;
+	mt76x2_phy_set_gain_val(dev);
+
+	/* clear false CCA counters */
+	mt76_rr(dev, MT_RX_STAT_1);
+}
+
+int mt76x2_phy_set_channel(struct mt76x2_dev *dev,
+			   struct cfg80211_chan_def *chandef)
+{
+	struct ieee80211_channel *chan = chandef->chan;
+	bool scan = test_bit(MT76_SCANNING, &dev->mt76.state);
+	enum nl80211_band band = chan->band;
+	u8 channel;
+
+	u32 ext_cca_chan[4] = {
+		[0] = FIELD_PREP(MT_EXT_CCA_CFG_CCA0, 0) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA1, 1) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA2, 2) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA3, 3) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA_MASK, BIT(0)),
+		[1] = FIELD_PREP(MT_EXT_CCA_CFG_CCA0, 1) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA1, 0) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA2, 2) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA3, 3) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA_MASK, BIT(1)),
+		[2] = FIELD_PREP(MT_EXT_CCA_CFG_CCA0, 2) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA1, 3) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA2, 1) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA3, 0) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA_MASK, BIT(2)),
+		[3] = FIELD_PREP(MT_EXT_CCA_CFG_CCA0, 3) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA1, 2) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA2, 1) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA3, 0) |
+		      FIELD_PREP(MT_EXT_CCA_CFG_CCA_MASK, BIT(3)),
+	};
+	int ch_group_index;
+	u8 bw, bw_index;
+	int freq, freq1;
+	int ret;
+
+	dev->cal.channel_cal_done = false;
+	freq = chandef->chan->center_freq;
+	freq1 = chandef->center_freq1;
+	channel = chan->hw_value;
+
+	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_40:
+		bw = 1;
+		if (freq1 > freq) {
+			bw_index = 1;
+			ch_group_index = 0;
+		} else {
+			bw_index = 3;
+			ch_group_index = 1;
+		}
+		channel += 2 - ch_group_index * 4;
+		break;
+	case NL80211_CHAN_WIDTH_80:
+		ch_group_index = (freq - freq1 + 30) / 20;
+		if (WARN_ON(ch_group_index < 0 || ch_group_index > 3))
+			ch_group_index = 0;
+		bw = 2;
+		bw_index = ch_group_index;
+		channel += 6 - ch_group_index * 4;
+		break;
+	default:
+		bw = 0;
+		bw_index = 0;
+		ch_group_index = 0;
+		break;
+	}
+
+	mt76x2_read_rx_gain(dev);
+	mt76x2_phy_set_txpower_regs(dev, band);
+	mt76x2_configure_tx_delay(dev, band, bw);
+	mt76x2_phy_set_txpower(dev);
+
+	mt76x2_phy_set_band(dev, chan->band, ch_group_index & 1);
+	mt76x2_phy_set_bw(dev, chandef->width, ch_group_index);
+
+	mt76_rmw(dev, MT_EXT_CCA_CFG,
+		 (MT_EXT_CCA_CFG_CCA0 |
+		  MT_EXT_CCA_CFG_CCA1 |
+		  MT_EXT_CCA_CFG_CCA2 |
+		  MT_EXT_CCA_CFG_CCA3 |
+		  MT_EXT_CCA_CFG_CCA_MASK),
+		 ext_cca_chan[ch_group_index]);
+
+	ret = mt76x2_mcu_set_channel(dev, channel, bw, bw_index, scan);
+	if (ret)
+		return ret;
+
+	mt76x2_mcu_init_gain(dev, channel, dev->cal.rx.mcu_gain, true);
+
+	mt76x2_phy_set_antenna(dev);
+
+	/* Enable LDPC Rx */
+	if (mt76xx_rev(dev) >= MT76XX_REV_E3)
+		mt76_set(dev, MT_BBP(RXO, 13), BIT(10));
+
+	if (!dev->cal.init_cal_done) {
+		u8 val = mt76x2_eeprom_get(dev, MT_EE_BT_RCAL_RESULT);
+
+		if (val != 0xff)
+			mt76x2_mcu_calibrate(dev, MCU_CAL_R, 0);
+	}
+
+	mt76x2_mcu_calibrate(dev, MCU_CAL_RXDCOC, channel);
+
+	/* Rx LPF calibration */
+	if (!dev->cal.init_cal_done)
+		mt76x2_mcu_calibrate(dev, MCU_CAL_RC, 0);
+
+	dev->cal.init_cal_done = true;
+
+	mt76_wr(dev, MT_BBP(AGC, 61), 0xFF64A4E2);
+	mt76_wr(dev, MT_BBP(AGC, 7), 0x08081010);
+	mt76_wr(dev, MT_BBP(AGC, 11), 0x00000404);
+	mt76_wr(dev, MT_BBP(AGC, 2), 0x00007070);
+	mt76_wr(dev, MT_TXOP_CTRL_CFG, 0x04101B3F);
+
+	if (scan)
+		return 0;
+
+	dev->cal.low_gain = -1;
+	mt76x2_phy_channel_calibrate(dev, true);
+	mt76x2_get_agc_gain(dev, dev->cal.agc_gain_init);
+	memcpy(dev->cal.agc_gain_cur, dev->cal.agc_gain_init,
+	       sizeof(dev->cal.agc_gain_cur));
+
+	/* init default values for temp compensation */
+	if (mt76x2_tssi_enabled(dev)) {
+		mt76_rmw_field(dev, MT_TX_ALC_CFG_1, MT_TX_ALC_CFG_1_TEMP_COMP,
+			       0x38);
+		mt76_rmw_field(dev, MT_TX_ALC_CFG_2, MT_TX_ALC_CFG_2_TEMP_COMP,
+			       0x38);
+	}
+
+	ieee80211_queue_delayed_work(mt76_hw(dev), &dev->cal_work,
+				     MT_CALIBRATE_INTERVAL);
+
+	return 0;
+}
+
+static void
+mt76x2_phy_tssi_compensate(struct mt76x2_dev *dev)
+{
+	struct ieee80211_channel *chan = dev->mt76.chandef.chan;
+	struct mt76x2_tx_power_info txp;
+	struct mt76x2_tssi_comp t = {};
+
+	if (!dev->cal.tssi_cal_done)
+		return;
+
+	if (!dev->cal.tssi_comp_pending) {
+		/* TSSI trigger */
+		t.cal_mode = BIT(0);
+		mt76x2_mcu_tssi_comp(dev, &t);
+		dev->cal.tssi_comp_pending = true;
+	} else {
+		if (mt76_rr(dev, MT_BBP(CORE, 34)) & BIT(4))
+			return;
+
+		dev->cal.tssi_comp_pending = false;
+		mt76x2_get_power_info(dev, &txp, chan);
+
+		if (mt76x2_ext_pa_enabled(dev, chan->band))
+			t.pa_mode = 1;
+
+		t.cal_mode = BIT(1);
+		t.slope0 = txp.chain[0].tssi_slope;
+		t.offset0 = txp.chain[0].tssi_offset;
+		t.slope1 = txp.chain[1].tssi_slope;
+		t.offset1 = txp.chain[1].tssi_offset;
+		mt76x2_mcu_tssi_comp(dev, &t);
+
+		if (t.pa_mode || dev->cal.dpd_cal_done)
+			return;
+
+		usleep_range(10000, 20000);
+		mt76x2_mcu_calibrate(dev, MCU_CAL_DPD, chan->hw_value);
+		dev->cal.dpd_cal_done = true;
+	}
+}
+
+static void
+mt76x2_phy_temp_compensate(struct mt76x2_dev *dev)
+{
+	struct mt76x2_temp_comp t;
+	int temp, db_diff;
+
+	if (mt76x2_get_temp_comp(dev, &t))
+		return;
+
+	temp = mt76_get_field(dev, MT_TEMP_SENSOR, MT_TEMP_SENSOR_VAL);
+	temp -= t.temp_25_ref;
+	temp = (temp * 1789) / 1000 + 25;
+	dev->cal.temp = temp;
+
+	if (temp > 25)
+		db_diff = (temp - 25) / t.high_slope;
+	else
+		db_diff = (25 - temp) / t.low_slope;
+
+	db_diff = min(db_diff, t.upper_bound);
+	db_diff = max(db_diff, t.lower_bound);
+
+	mt76_rmw_field(dev, MT_TX_ALC_CFG_1, MT_TX_ALC_CFG_1_TEMP_COMP,
+		       db_diff * 2);
+	mt76_rmw_field(dev, MT_TX_ALC_CFG_2, MT_TX_ALC_CFG_2_TEMP_COMP,
+		       db_diff * 2);
+}
+
+void mt76x2_phy_calibrate(struct work_struct *work)
+{
+	struct mt76x2_dev *dev;
+
+	dev = container_of(work, struct mt76x2_dev, cal_work.work);
+	mt76x2_phy_channel_calibrate(dev, false);
+	mt76x2_phy_tssi_compensate(dev);
+	mt76x2_phy_temp_compensate(dev);
+	mt76x2_phy_update_channel_gain(dev);
+	ieee80211_queue_delayed_work(mt76_hw(dev), &dev->cal_work,
+				     MT_CALIBRATE_INTERVAL);
+}
+
+int mt76x2_phy_start(struct mt76x2_dev *dev)
+{
+	int ret;
+
+	ret = mt76x2_mcu_set_radio_state(dev, true);
+	if (ret)
+		return ret;
+
+	mt76x2_mcu_load_cr(dev, MT_RF_BBP_CR, 0, 0);
+
+	return ret;
+}