net: ethernet: mtk_eth_soc: add support for Wireless Ethernet Dispatch (WED)

The Wireless Ethernet Dispatch subsystem on the MT7622 SoC can be
configured to intercept and handle access to the DMA queues and
PCIe interrupts for a MT7615/MT7915 wireless card.
It can manage the internal WDMA (Wireless DMA) controller, which allows
ethernet packets to be passed from the packet switch engine (PSE) to the
wireless card, bypassing the CPU entirely.
This can be used to implement hardware flow offloading from ethernet to
WLAN.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 175 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mediatek/mtk_wed_debugfs.c b/drivers/net/ethernet/mediatek/mtk_wed_debugfs.c
new file mode 100644
index 000000000000..a81d3fd1a439
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/mtk_wed_debugfs.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2021 Felix Fietkau <nbd@nbd.name> */
+
+#include <linux/seq_file.h>
+#include "mtk_wed.h"
+#include "mtk_wed_regs.h"
+
+struct reg_dump {
+	const char *name;
+	u16 offset;
+	u8 type;
+	u8 base;
+};
+
+enum {
+	DUMP_TYPE_STRING,
+	DUMP_TYPE_WED,
+	DUMP_TYPE_WDMA,
+	DUMP_TYPE_WPDMA_TX,
+	DUMP_TYPE_WPDMA_TXFREE,
+};
+
+#define DUMP_STR(_str) { _str, 0, DUMP_TYPE_STRING }
+#define DUMP_REG(_reg, ...) { #_reg, MTK_##_reg, __VA_ARGS__ }
+#define DUMP_RING(_prefix, _base, ...)				\
+	{ _prefix " BASE", _base, __VA_ARGS__ },		\
+	{ _prefix " CNT",  _base + 0x4, __VA_ARGS__ },	\
+	{ _prefix " CIDX", _base + 0x8, __VA_ARGS__ },	\
+	{ _prefix " DIDX", _base + 0xc, __VA_ARGS__ }
+
+#define DUMP_WED(_reg) DUMP_REG(_reg, DUMP_TYPE_WED)
+#define DUMP_WED_RING(_base) DUMP_RING(#_base, MTK_##_base, DUMP_TYPE_WED)
+
+#define DUMP_WDMA(_reg) DUMP_REG(_reg, DUMP_TYPE_WDMA)
+#define DUMP_WDMA_RING(_base) DUMP_RING(#_base, MTK_##_base, DUMP_TYPE_WDMA)
+
+#define DUMP_WPDMA_TX_RING(_n) DUMP_RING("WPDMA_TX" #_n, 0, DUMP_TYPE_WPDMA_TX, _n)
+#define DUMP_WPDMA_TXFREE_RING DUMP_RING("WPDMA_RX1", 0, DUMP_TYPE_WPDMA_TXFREE)
+
+static void
+print_reg_val(struct seq_file *s, const char *name, u32 val)
+{
+	seq_printf(s, "%-32s %08x\n", name, val);
+}
+
+static void
+dump_wed_regs(struct seq_file *s, struct mtk_wed_device *dev,
+	      const struct reg_dump *regs, int n_regs)
+{
+	const struct reg_dump *cur;
+	u32 val;
+
+	for (cur = regs; cur < &regs[n_regs]; cur++) {
+		switch (cur->type) {
+		case DUMP_TYPE_STRING:
+			seq_printf(s, "%s======== %s:\n",
+				   cur > regs ? "\n" : "",
+				   cur->name);
+			continue;
+		case DUMP_TYPE_WED:
+			val = wed_r32(dev, cur->offset);
+			break;
+		case DUMP_TYPE_WDMA:
+			val = wdma_r32(dev, cur->offset);
+			break;
+		case DUMP_TYPE_WPDMA_TX:
+			val = wpdma_tx_r32(dev, cur->base, cur->offset);
+			break;
+		case DUMP_TYPE_WPDMA_TXFREE:
+			val = wpdma_txfree_r32(dev, cur->offset);
+			break;
+		}
+		print_reg_val(s, cur->name, val);
+	}
+}
+
+
+static int
+wed_txinfo_show(struct seq_file *s, void *data)
+{
+	static const struct reg_dump regs[] = {
+		DUMP_STR("WED TX"),
+		DUMP_WED(WED_TX_MIB(0)),
+		DUMP_WED_RING(WED_RING_TX(0)),
+
+		DUMP_WED(WED_TX_MIB(1)),
+		DUMP_WED_RING(WED_RING_TX(1)),
+
+		DUMP_STR("WPDMA TX"),
+		DUMP_WED(WED_WPDMA_TX_MIB(0)),
+		DUMP_WED_RING(WED_WPDMA_RING_TX(0)),
+		DUMP_WED(WED_WPDMA_TX_COHERENT_MIB(0)),
+
+		DUMP_WED(WED_WPDMA_TX_MIB(1)),
+		DUMP_WED_RING(WED_WPDMA_RING_TX(1)),
+		DUMP_WED(WED_WPDMA_TX_COHERENT_MIB(1)),
+
+		DUMP_STR("WPDMA TX"),
+		DUMP_WPDMA_TX_RING(0),
+		DUMP_WPDMA_TX_RING(1),
+
+		DUMP_STR("WED WDMA RX"),
+		DUMP_WED(WED_WDMA_RX_MIB(0)),
+		DUMP_WED_RING(WED_WDMA_RING_RX(0)),
+		DUMP_WED(WED_WDMA_RX_THRES(0)),
+		DUMP_WED(WED_WDMA_RX_RECYCLE_MIB(0)),
+		DUMP_WED(WED_WDMA_RX_PROCESSED_MIB(0)),
+
+		DUMP_WED(WED_WDMA_RX_MIB(1)),
+		DUMP_WED_RING(WED_WDMA_RING_RX(1)),
+		DUMP_WED(WED_WDMA_RX_THRES(1)),
+		DUMP_WED(WED_WDMA_RX_RECYCLE_MIB(1)),
+		DUMP_WED(WED_WDMA_RX_PROCESSED_MIB(1)),
+
+		DUMP_STR("WDMA RX"),
+		DUMP_WDMA(WDMA_GLO_CFG),
+		DUMP_WDMA_RING(WDMA_RING_RX(0)),
+		DUMP_WDMA_RING(WDMA_RING_RX(1)),
+	};
+	struct mtk_wed_hw *hw = s->private;
+	struct mtk_wed_device *dev = hw->wed_dev;
+
+	if (!dev)
+		return 0;
+
+	dump_wed_regs(s, dev, regs, ARRAY_SIZE(regs));
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(wed_txinfo);
+
+
+static int
+mtk_wed_reg_set(void *data, u64 val)
+{
+	struct mtk_wed_hw *hw = data;
+
+	regmap_write(hw->regs, hw->debugfs_reg, val);
+
+	return 0;
+}
+
+static int
+mtk_wed_reg_get(void *data, u64 *val)
+{
+	struct mtk_wed_hw *hw = data;
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(hw->regs, hw->debugfs_reg, &regval);
+	if (ret)
+		return ret;
+
+	*val = regval;
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_regval, mtk_wed_reg_get, mtk_wed_reg_set,
+             "0x%08llx\n");
+
+void mtk_wed_hw_add_debugfs(struct mtk_wed_hw *hw)
+{
+	struct dentry *dir;
+
+	snprintf(hw->dirname, sizeof(hw->dirname), "wed%d", hw->index);
+	dir = debugfs_create_dir(hw->dirname, NULL);
+	if (!dir)
+		return;
+
+	hw->debugfs_dir = dir;
+	debugfs_create_u32("regidx", 0600, dir, &hw->debugfs_reg);
+	debugfs_create_file_unsafe("regval", 0600, dir, hw, &fops_regval);
+	debugfs_create_file_unsafe("txinfo", 0400, dir, hw, &wed_txinfo_fops);
+}