1 files changed, 374 insertions, 0 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_vlan.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_vlan.c
new file mode 100644
index 000000000000..0b6f6228ae35
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_vlan.c
@@ -0,0 +1,374 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2025, Altera Corporation
+ * stmmac VLAN (802.1Q) handling
+ */
+
+#include "stmmac.h"
+#include "stmmac_vlan.h"
+
+static void vlan_write_single(struct net_device *dev, u16 vid)
+{
+	void __iomem *ioaddr = (void __iomem *)dev->base_addr;
+	u32 val;
+
+	val = readl(ioaddr + VLAN_TAG);
+	val &= ~VLAN_TAG_VID;
+	val |= VLAN_TAG_ETV | vid;
+
+	writel(val, ioaddr + VLAN_TAG);
+}
+
+static int vlan_write_filter(struct net_device *dev,
+			     struct mac_device_info *hw,
+			     u8 index, u32 data)
+{
+	void __iomem *ioaddr = (void __iomem *)dev->base_addr;
+	int ret;
+	u32 val;
+
+	if (index >= hw->num_vlan)
+		return -EINVAL;
+
+	writel(data, ioaddr + VLAN_TAG_DATA);
+
+	val = readl(ioaddr + VLAN_TAG);
+	val &= ~(VLAN_TAG_CTRL_OFS_MASK |
+		VLAN_TAG_CTRL_CT |
+		VLAN_TAG_CTRL_OB);
+	val |= (index << VLAN_TAG_CTRL_OFS_SHIFT) | VLAN_TAG_CTRL_OB;
+
+	writel(val, ioaddr + VLAN_TAG);
+
+	ret = readl_poll_timeout(ioaddr + VLAN_TAG, val,
+				 !(val & VLAN_TAG_CTRL_OB),
+				 1000, 500000);
+	if (ret) {
+		netdev_err(dev, "Timeout accessing MAC_VLAN_Tag_Filter\n");
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static int vlan_add_hw_rx_fltr(struct net_device *dev,
+			       struct mac_device_info *hw,
+			       __be16 proto, u16 vid)
+{
+	int index = -1;
+	u32 val = 0;
+	int i, ret;
+
+	if (vid > 4095)
+		return -EINVAL;
+
+	/* Single Rx VLAN Filter */
+	if (hw->num_vlan == 1) {
+		/* For single VLAN filter, VID 0 means VLAN promiscuous */
+		if (vid == 0) {
+			netdev_warn(dev, "Adding VLAN ID 0 is not supported\n");
+			return -EPERM;
+		}
+
+		if (hw->vlan_filter[0] & VLAN_TAG_VID) {
+			netdev_err(dev, "Only single VLAN ID supported\n");
+			return -EPERM;
+		}
+
+		hw->vlan_filter[0] = vid;
+		vlan_write_single(dev, vid);
+
+		return 0;
+	}
+
+	/* Extended Rx VLAN Filter Enable */
+	val |= VLAN_TAG_DATA_ETV | VLAN_TAG_DATA_VEN | vid;
+
+	for (i = 0; i < hw->num_vlan; i++) {
+		if (hw->vlan_filter[i] == val)
+			return 0;
+		else if (!(hw->vlan_filter[i] & VLAN_TAG_DATA_VEN))
+			index = i;
+	}
+
+	if (index == -1) {
+		netdev_err(dev, "MAC_VLAN_Tag_Filter full (size: %0u)\n",
+			   hw->num_vlan);
+		return -EPERM;
+	}
+
+	ret = vlan_write_filter(dev, hw, index, val);
+
+	if (!ret)
+		hw->vlan_filter[index] = val;
+
+	return ret;
+}
+
+static int vlan_del_hw_rx_fltr(struct net_device *dev,
+			       struct mac_device_info *hw,
+			       __be16 proto, u16 vid)
+{
+	int i, ret = 0;
+
+	/* Single Rx VLAN Filter */
+	if (hw->num_vlan == 1) {
+		if ((hw->vlan_filter[0] & VLAN_TAG_VID) == vid) {
+			hw->vlan_filter[0] = 0;
+			vlan_write_single(dev, 0);
+		}
+		return 0;
+	}
+
+	/* Extended Rx VLAN Filter Enable */
+	for (i = 0; i < hw->num_vlan; i++) {
+		if ((hw->vlan_filter[i] & VLAN_TAG_DATA_VID) == vid) {
+			ret = vlan_write_filter(dev, hw, i, 0);
+
+			if (!ret)
+				hw->vlan_filter[i] = 0;
+			else
+				return ret;
+		}
+	}
+
+	return ret;
+}
+
+static void vlan_restore_hw_rx_fltr(struct net_device *dev,
+				    struct mac_device_info *hw)
+{
+	void __iomem *ioaddr = hw->pcsr;
+	u32 value;
+	u32 hash;
+	u32 val;
+	int i;
+
+	/* Single Rx VLAN Filter */
+	if (hw->num_vlan == 1) {
+		vlan_write_single(dev, hw->vlan_filter[0]);
+		return;
+	}
+
+	/* Extended Rx VLAN Filter Enable */
+	for (i = 0; i < hw->num_vlan; i++) {
+		if (hw->vlan_filter[i] & VLAN_TAG_DATA_VEN) {
+			val = hw->vlan_filter[i];
+			vlan_write_filter(dev, hw, i, val);
+		}
+	}
+
+	hash = readl(ioaddr + VLAN_HASH_TABLE);
+	if (hash & VLAN_VLHT) {
+		value = readl(ioaddr + VLAN_TAG);
+		value |= VLAN_VTHM;
+		writel(value, ioaddr + VLAN_TAG);
+	}
+}
+
+static void vlan_update_hash(struct mac_device_info *hw, u32 hash,
+			     u16 perfect_match, bool is_double)
+{
+	void __iomem *ioaddr = hw->pcsr;
+	u32 value;
+
+	writel(hash, ioaddr + VLAN_HASH_TABLE);
+
+	value = readl(ioaddr + VLAN_TAG);
+
+	if (hash) {
+		value |= VLAN_VTHM | VLAN_ETV;
+		if (is_double) {
+			value |= VLAN_EDVLP;
+			value |= VLAN_ESVL;
+			value |= VLAN_DOVLTC;
+		}
+
+		writel(value, ioaddr + VLAN_TAG);
+	} else if (perfect_match) {
+		u32 value = VLAN_ETV;
+
+		if (is_double) {
+			value |= VLAN_EDVLP;
+			value |= VLAN_ESVL;
+			value |= VLAN_DOVLTC;
+		}
+
+		writel(value | perfect_match, ioaddr + VLAN_TAG);
+	} else {
+		value &= ~(VLAN_VTHM | VLAN_ETV);
+		value &= ~(VLAN_EDVLP | VLAN_ESVL);
+		value &= ~VLAN_DOVLTC;
+		value &= ~VLAN_VID;
+
+		writel(value, ioaddr + VLAN_TAG);
+	}
+}
+
+static void vlan_enable(struct mac_device_info *hw, u32 type)
+{
+	void __iomem *ioaddr = hw->pcsr;
+	u32 value;
+
+	value = readl(ioaddr + VLAN_INCL);
+	value |= VLAN_VLTI;
+	value |= VLAN_CSVL; /* Only use SVLAN */
+	value &= ~VLAN_VLC;
+	value |= (type << VLAN_VLC_SHIFT) & VLAN_VLC;
+	writel(value, ioaddr + VLAN_INCL);
+}
+
+static void vlan_rx_hw(struct mac_device_info *hw,
+		       struct dma_desc *rx_desc, struct sk_buff *skb)
+{
+	if (hw->desc->get_rx_vlan_valid(rx_desc)) {
+		u16 vid = hw->desc->get_rx_vlan_tci(rx_desc);
+
+		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
+	}
+}
+
+static void vlan_set_hw_mode(struct mac_device_info *hw)
+{
+	void __iomem *ioaddr = hw->pcsr;
+	u32 value = readl(ioaddr + VLAN_TAG);
+
+	value &= ~VLAN_TAG_CTRL_EVLS_MASK;
+
+	if (hw->hw_vlan_en)
+		/* Always strip VLAN on Receive */
+		value |= VLAN_TAG_STRIP_ALL;
+	else
+		/* Do not strip VLAN on Receive */
+		value |= VLAN_TAG_STRIP_NONE;
+
+	/* Enable outer VLAN Tag in Rx DMA descriptor */
+	value |= VLAN_TAG_CTRL_EVLRXS;
+	writel(value, ioaddr + VLAN_TAG);
+}
+
+static void dwxgmac2_update_vlan_hash(struct mac_device_info *hw, u32 hash,
+				      u16 perfect_match, bool is_double)
+{
+	void __iomem *ioaddr = hw->pcsr;
+
+	writel(hash, ioaddr + VLAN_HASH_TABLE);
+
+	if (hash) {
+		u32 value = readl(ioaddr + XGMAC_PACKET_FILTER);
+
+		value |= XGMAC_FILTER_VTFE;
+
+		writel(value, ioaddr + XGMAC_PACKET_FILTER);
+
+		value = readl(ioaddr + VLAN_TAG);
+
+		value |= VLAN_VTHM | VLAN_ETV;
+		if (is_double) {
+			value |= VLAN_EDVLP;
+			value |= VLAN_ESVL;
+			value |= VLAN_DOVLTC;
+		} else {
+			value &= ~VLAN_EDVLP;
+			value &= ~VLAN_ESVL;
+			value &= ~VLAN_DOVLTC;
+		}
+
+		value &= ~VLAN_VID;
+		writel(value, ioaddr + VLAN_TAG);
+	} else if (perfect_match) {
+		u32 value = readl(ioaddr + XGMAC_PACKET_FILTER);
+
+		value |= XGMAC_FILTER_VTFE;
+
+		writel(value, ioaddr + XGMAC_PACKET_FILTER);
+
+		value = readl(ioaddr + VLAN_TAG);
+
+		value &= ~VLAN_VTHM;
+		value |= VLAN_ETV;
+		if (is_double) {
+			value |= VLAN_EDVLP;
+			value |= VLAN_ESVL;
+			value |= VLAN_DOVLTC;
+		} else {
+			value &= ~VLAN_EDVLP;
+			value &= ~VLAN_ESVL;
+			value &= ~VLAN_DOVLTC;
+		}
+
+		value &= ~VLAN_VID;
+		writel(value | perfect_match, ioaddr + VLAN_TAG);
+	} else {
+		u32 value = readl(ioaddr + XGMAC_PACKET_FILTER);
+
+		value &= ~XGMAC_FILTER_VTFE;
+
+		writel(value, ioaddr + XGMAC_PACKET_FILTER);
+
+		value = readl(ioaddr + VLAN_TAG);
+
+		value &= ~(VLAN_VTHM | VLAN_ETV);
+		value &= ~(VLAN_EDVLP | VLAN_ESVL);
+		value &= ~VLAN_DOVLTC;
+		value &= ~VLAN_VID;
+
+		writel(value, ioaddr + VLAN_TAG);
+	}
+}
+
+const struct stmmac_vlan_ops dwmac_vlan_ops = {
+	.update_vlan_hash = vlan_update_hash,
+	.enable_vlan = vlan_enable,
+	.add_hw_vlan_rx_fltr = vlan_add_hw_rx_fltr,
+	.del_hw_vlan_rx_fltr = vlan_del_hw_rx_fltr,
+	.restore_hw_vlan_rx_fltr = vlan_restore_hw_rx_fltr,
+	.rx_hw_vlan = vlan_rx_hw,
+	.set_hw_vlan_mode = vlan_set_hw_mode,
+};
+
+const struct stmmac_vlan_ops dwxlgmac2_vlan_ops = {
+	.update_vlan_hash = dwxgmac2_update_vlan_hash,
+	.enable_vlan = vlan_enable,
+};
+
+const struct stmmac_vlan_ops dwxgmac210_vlan_ops = {
+	.update_vlan_hash = dwxgmac2_update_vlan_hash,
+	.enable_vlan = vlan_enable,
+	.add_hw_vlan_rx_fltr = vlan_add_hw_rx_fltr,
+	.del_hw_vlan_rx_fltr = vlan_del_hw_rx_fltr,
+	.restore_hw_vlan_rx_fltr = vlan_restore_hw_rx_fltr,
+	.rx_hw_vlan = vlan_rx_hw,
+	.set_hw_vlan_mode = vlan_set_hw_mode,
+};
+
+u32 stmmac_get_num_vlan(void __iomem *ioaddr)
+{
+	u32 val, num_vlan;
+
+	val = readl(ioaddr + HW_FEATURE3);
+	switch (val & VLAN_HW_FEAT_NRVF) {
+	case 0:
+		num_vlan = 1;
+		break;
+	case 1:
+		num_vlan = 4;
+		break;
+	case 2:
+		num_vlan = 8;
+		break;
+	case 3:
+		num_vlan = 16;
+		break;
+	case 4:
+		num_vlan = 24;
+		break;
+	case 5:
+		num_vlan = 32;
+		break;
+	default:
+		num_vlan = 1;
+	}
+
+	return num_vlan;
+}