mt76: import mediatek/mt76 driver

Import ISC-licensed driver parts of mediatek/mt76
assumed to be based on Linux wireless-testing at
a02411a5b98612c12be99349836d99f07db12a77 (tag: wt-2022-11-23).

Complement the driver and LinuxKPI with our own (dummy)
implementations of missing parts (util.h and soc/mediatek/)
as well as changes to make compile on FreeBSD with changes
covered by #ifdef (__FreeBSD__) conditions.
Further select updates were applied since the initial import
in order to keep compiling along with other LinuxKPI based
drivers.

For the moment we only target the mt7915 and mt7921 PCI parts.
More may follow in the future.

Firmware is provided by port net/wifi-firmware-mt76-kmod.

Given the lack of full license texts on non-local files this is
imported under the draft policy for handling SPDX files (D29226). [1]

Approved by:	core (emaste, 2022-04-08) [1]
MFC after:	2 months

1 files changed, 154 insertions, 0 deletions

diff --git a/sys/contrib/dev/mediatek/mt76/mt76x02_eeprom.c b/sys/contrib/dev/mediatek/mt76/mt76x02_eeprom.c
new file mode 100644
index 000000000000..0acabba2d1a5
--- /dev/null
+++ b/sys/contrib/dev/mediatek/mt76/mt76x02_eeprom.c
@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: ISC
+/*
+ * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
+ * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
+ */
+
+#include <asm/unaligned.h>
+
+#include "mt76x02_eeprom.h"
+
+static int
+mt76x02_efuse_read(struct mt76x02_dev *dev, u16 addr, u8 *data,
+		   enum mt76x02_eeprom_modes mode)
+{
+	u32 val;
+	int i;
+
+	val = mt76_rr(dev, MT_EFUSE_CTRL);
+	val &= ~(MT_EFUSE_CTRL_AIN |
+		 MT_EFUSE_CTRL_MODE);
+	val |= FIELD_PREP(MT_EFUSE_CTRL_AIN, addr & ~0xf);
+	val |= FIELD_PREP(MT_EFUSE_CTRL_MODE, mode);
+	val |= MT_EFUSE_CTRL_KICK;
+	mt76_wr(dev, MT_EFUSE_CTRL, val);
+
+	if (!mt76_poll_msec(dev, MT_EFUSE_CTRL, MT_EFUSE_CTRL_KICK, 0, 1000))
+		return -ETIMEDOUT;
+
+	udelay(2);
+
+	val = mt76_rr(dev, MT_EFUSE_CTRL);
+	if ((val & MT_EFUSE_CTRL_AOUT) == MT_EFUSE_CTRL_AOUT) {
+		memset(data, 0xff, 16);
+		return 0;
+	}
+
+	for (i = 0; i < 4; i++) {
+		val = mt76_rr(dev, MT_EFUSE_DATA(i));
+		put_unaligned_le32(val, data + 4 * i);
+	}
+
+	return 0;
+}
+
+int mt76x02_eeprom_copy(struct mt76x02_dev *dev,
+			enum mt76x02_eeprom_field field,
+			void *dest, int len)
+{
+	if (field + len > dev->mt76.eeprom.size)
+		return -1;
+
+	memcpy(dest, dev->mt76.eeprom.data + field, len);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mt76x02_eeprom_copy);
+
+int mt76x02_get_efuse_data(struct mt76x02_dev *dev, u16 base, void *buf,
+			   int len, enum mt76x02_eeprom_modes mode)
+{
+	int ret, i;
+
+	for (i = 0; i + 16 <= len; i += 16) {
+		ret = mt76x02_efuse_read(dev, base + i, buf + i, mode);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mt76x02_get_efuse_data);
+
+void mt76x02_eeprom_parse_hw_cap(struct mt76x02_dev *dev)
+{
+	u16 val = mt76x02_eeprom_get(dev, MT_EE_NIC_CONF_0);
+
+	switch (FIELD_GET(MT_EE_NIC_CONF_0_BOARD_TYPE, val)) {
+	case BOARD_TYPE_5GHZ:
+		dev->mphy.cap.has_5ghz = true;
+		break;
+	case BOARD_TYPE_2GHZ:
+		dev->mphy.cap.has_2ghz = true;
+		break;
+	default:
+		dev->mphy.cap.has_2ghz = true;
+		dev->mphy.cap.has_5ghz = true;
+		break;
+	}
+}
+EXPORT_SYMBOL_GPL(mt76x02_eeprom_parse_hw_cap);
+
+bool mt76x02_ext_pa_enabled(struct mt76x02_dev *dev, enum nl80211_band band)
+{
+	u16 conf0 = mt76x02_eeprom_get(dev, MT_EE_NIC_CONF_0);
+
+	if (band == NL80211_BAND_5GHZ)
+		return !(conf0 & MT_EE_NIC_CONF_0_PA_INT_5G);
+	else
+		return !(conf0 & MT_EE_NIC_CONF_0_PA_INT_2G);
+}
+EXPORT_SYMBOL_GPL(mt76x02_ext_pa_enabled);
+
+void mt76x02_get_rx_gain(struct mt76x02_dev *dev, enum nl80211_band band,
+			 u16 *rssi_offset, s8 *lna_2g, s8 *lna_5g)
+{
+	u16 val;
+
+	val = mt76x02_eeprom_get(dev, MT_EE_LNA_GAIN);
+	*lna_2g = val & 0xff;
+	lna_5g[0] = val >> 8;
+
+	val = mt76x02_eeprom_get(dev, MT_EE_RSSI_OFFSET_2G_1);
+	lna_5g[1] = val >> 8;
+
+	val = mt76x02_eeprom_get(dev, MT_EE_RSSI_OFFSET_5G_1);
+	lna_5g[2] = val >> 8;
+
+	if (!mt76x02_field_valid(lna_5g[1]))
+		lna_5g[1] = lna_5g[0];
+
+	if (!mt76x02_field_valid(lna_5g[2]))
+		lna_5g[2] = lna_5g[0];
+
+	if (band == NL80211_BAND_2GHZ)
+		*rssi_offset = mt76x02_eeprom_get(dev, MT_EE_RSSI_OFFSET_2G_0);
+	else
+		*rssi_offset = mt76x02_eeprom_get(dev, MT_EE_RSSI_OFFSET_5G_0);
+}
+EXPORT_SYMBOL_GPL(mt76x02_get_rx_gain);
+
+u8 mt76x02_get_lna_gain(struct mt76x02_dev *dev,
+			s8 *lna_2g, s8 *lna_5g,
+			struct ieee80211_channel *chan)
+{
+	u16 val;
+	u8 lna;
+
+	val = mt76x02_eeprom_get(dev, MT_EE_NIC_CONF_1);
+	if (val & MT_EE_NIC_CONF_1_LNA_EXT_2G)
+		*lna_2g = 0;
+	if (val & MT_EE_NIC_CONF_1_LNA_EXT_5G)
+		memset(lna_5g, 0, sizeof(s8) * 3);
+
+	if (chan->band == NL80211_BAND_2GHZ)
+		lna = *lna_2g;
+	else if (chan->hw_value <= 64)
+		lna = lna_5g[0];
+	else if (chan->hw_value <= 128)
+		lna = lna_5g[1];
+	else
+		lna = lna_5g[2];
+
+	return lna != 0xff ? lna : 0;
+}
+EXPORT_SYMBOL_GPL(mt76x02_get_lna_gain);