mt76: mt7921: introduce mt7921e support

Introduce support for mt7921e 802.11ax (Wi-Fi 6) 2x2:2SS chipset.

Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Co-developed-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>

drivers/net/wireless/mediatek/mt76/Kconfig

@@ -29,3 +29,4 @@ source "drivers/net/wireless/mediatek/mt76/mt76x2/Kconfig"
 source "drivers/net/wireless/mediatek/mt76/mt7603/Kconfig"
 source "drivers/net/wireless/mediatek/mt76/mt7615/Kconfig"
 source "drivers/net/wireless/mediatek/mt76/mt7915/Kconfig"
+source "drivers/net/wireless/mediatek/mt76/mt7921/Kconfig"

drivers/net/wireless/mediatek/mt76/Makefile

@@ -31,3 +31,4 @@ obj-$(CONFIG_MT76x2_COMMON) += mt76x2/
 obj-$(CONFIG_MT7603E) += mt7603/
 obj-$(CONFIG_MT7615_COMMON) += mt7615/
 obj-$(CONFIG_MT7915E) += mt7915/
+obj-$(CONFIG_MT7921E) += mt7921/

drivers/net/wireless/mediatek/mt76/mt7921/Kconfig

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: ISC
+config MT7921E
+	tristate "MediaTek MT7921E (PCIe) support"
+	select MT76_CORE
+	depends on MAC80211
+	depends on PCI
+	help
+	  This adds support for MT7921E 802.11ax 2x2:2SS wireless devices.
+
+	  To compile this driver as a module, choose M here.

drivers/net/wireless/mediatek/mt76/mt7921/Makefile

@@ -0,0 +1,6 @@
+#SPDX-License-Identifier: ISC
+
+obj-$(CONFIG_MT7921E) += mt7921e.o
+
+mt7921e-y := pci.o init.o dma.o eeprom.o main.o mcu.o mac.o \
+	     debugfs.o

drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c

@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: ISC
+/* Copyright (C) 2020 MediaTek Inc. */
+
+#include "mt7921.h"
+#include "eeprom.h"
+
+static int
+mt7921_fw_debug_set(void *data, u64 val)
+{
+	struct mt7921_dev *dev = data;
+
+	dev->fw_debug = (u8)val;
+
+	mt7921_mcu_fw_log_2_host(dev, dev->fw_debug);
+
+	return 0;
+}
+
+static int
+mt7921_fw_debug_get(void *data, u64 *val)
+{
+	struct mt7921_dev *dev = data;
+
+	*val = dev->fw_debug;
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_fw_debug, mt7921_fw_debug_get,
+			 mt7921_fw_debug_set, "%lld\n");
+
+static void
+mt7921_ampdu_stat_read_phy(struct mt7921_phy *phy,
+			   struct seq_file *file)
+{
+	struct mt7921_dev *dev = file->private;
+	bool ext_phy = phy != &dev->phy;
+	int bound[15], range[4], i, n;
+
+	if (!phy)
+		return;
+
+	/* Tx ampdu stat */
+	for (i = 0; i < ARRAY_SIZE(range); i++)
+		range[i] = mt76_rr(dev, MT_MIB_ARNG(ext_phy, i));
+
+	for (i = 0; i < ARRAY_SIZE(bound); i++)
+		bound[i] = MT_MIB_ARNCR_RANGE(range[i / 4], i) + 1;
+
+	seq_printf(file, "\nPhy %d\n", ext_phy);
+
+	seq_printf(file, "Length: %8d | ", bound[0]);
+	for (i = 0; i < ARRAY_SIZE(bound) - 1; i++)
+		seq_printf(file, "%3d -%3d | ",
+			   bound[i] + 1, bound[i + 1]);
+
+	seq_puts(file, "\nCount:  ");
+	n = ext_phy ? ARRAY_SIZE(dev->mt76.aggr_stats) / 2 : 0;
+	for (i = 0; i < ARRAY_SIZE(bound); i++)
+		seq_printf(file, "%8d | ", dev->mt76.aggr_stats[i + n]);
+	seq_puts(file, "\n");
+
+	seq_printf(file, "BA miss count: %d\n", phy->mib.ba_miss_cnt);
+}
+
+static int
+mt7921_tx_stats_read(struct seq_file *file, void *data)
+{
+	struct mt7921_dev *dev = file->private;
+	int stat[8], i, n;
+
+	mt7921_ampdu_stat_read_phy(&dev->phy, file);
+
+	/* Tx amsdu info */
+	seq_puts(file, "Tx MSDU stat:\n");
+	for (i = 0, n = 0; i < ARRAY_SIZE(stat); i++) {
+		stat[i] = mt76_rr(dev,  MT_PLE_AMSDU_PACK_MSDU_CNT(i));
+		n += stat[i];
+	}
+
+	for (i = 0; i < ARRAY_SIZE(stat); i++) {
+		seq_printf(file, "AMSDU pack count of %d MSDU in TXD: 0x%x ",
+			   i + 1, stat[i]);
+		if (n != 0)
+			seq_printf(file, "(%d%%)\n", stat[i] * 100 / n);
+		else
+			seq_puts(file, "\n");
+	}
+
+	return 0;
+}
+
+static int
+mt7921_tx_stats_open(struct inode *inode, struct file *f)
+{
+	return single_open(f, mt7921_tx_stats_read, inode->i_private);
+}
+
+static const struct file_operations fops_tx_stats = {
+	.open = mt7921_tx_stats_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.owner = THIS_MODULE,
+};
+
+static int
+mt7921_queues_acq(struct seq_file *s, void *data)
+{
+	struct mt7921_dev *dev = dev_get_drvdata(s->private);
+	int i;
+
+	for (i = 0; i < 16; i++) {
+		int j, acs = i / 4, index = i % 4;
+		u32 ctrl, val, qlen = 0;
+
+		val = mt76_rr(dev, MT_PLE_AC_QEMPTY(acs, index));
+		ctrl = BIT(31) | BIT(15) | (acs << 8);
+
+		for (j = 0; j < 32; j++) {
+			if (val & BIT(j))
+				continue;
+
+			mt76_wr(dev, MT_PLE_FL_Q0_CTRL,
+				ctrl | (j + (index << 5)));
+			qlen += mt76_get_field(dev, MT_PLE_FL_Q3_CTRL,
+					       GENMASK(11, 0));
+		}
+		seq_printf(s, "AC%d%d: queued=%d\n", acs, index, qlen);
+	}
+
+	return 0;
+}
+
+static int
+mt7921_queues_read(struct seq_file *s, void *data)
+{
+	struct mt7921_dev *dev = dev_get_drvdata(s->private);
+	struct {
+		struct mt76_queue *q;
+		char *queue;
+	} queue_map[] = {
+		{ dev->mphy.q_tx[MT_TXQ_BE],	 "WFDMA0" },
+		{ dev->mt76.q_mcu[MT_MCUQ_WM],	 "MCUWM"  },
+		{ dev->mt76.q_mcu[MT_MCUQ_FWDL], "MCUFWQ" },
+	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(queue_map); i++) {
+		struct mt76_queue *q = queue_map[i].q;
+
+		if (!q)
+			continue;
+
+		seq_printf(s,
+			   "%s:	queued=%d head=%d tail=%d\n",
+			   queue_map[i].queue, q->queued, q->head,
+			   q->tail);
+	}
+
+	return 0;
+}
+
+int mt7921_init_debugfs(struct mt7921_dev *dev)
+{
+	struct dentry *dir;
+
+	dir = mt76_register_debugfs(&dev->mt76);
+	if (!dir)
+		return -ENOMEM;
+
+	debugfs_create_devm_seqfile(dev->mt76.dev, "queues", dir,
+				    mt7921_queues_read);
+	debugfs_create_devm_seqfile(dev->mt76.dev, "acq", dir,
+				    mt7921_queues_acq);
+	debugfs_create_file("tx_stats", 0400, dir, dev, &fops_tx_stats);
+	debugfs_create_file("fw_debug", 0600, dir, dev, &fops_fw_debug);
+
+	return 0;
+}