1 files changed, 827 insertions, 0 deletions

diff --git a/drivers/net/dsa/xrs700x/xrs700x.c b/drivers/net/dsa/xrs700x/xrs700x.c
new file mode 100644
index 0000000000..753fef757f
--- /dev/null
+++ b/drivers/net/dsa/xrs700x/xrs700x.c
@@ -0,0 +1,827 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 NovaTech LLC
+ * George McCollister <george.mccollister@gmail.com>
+ */
+
+#include <net/dsa.h>
+#include <linux/etherdevice.h>
+#include <linux/if_bridge.h>
+#include <linux/of.h>
+#include <linux/netdev_features.h>
+#include <linux/if_hsr.h>
+#include "xrs700x.h"
+#include "xrs700x_reg.h"
+
+#define XRS700X_MIB_INTERVAL msecs_to_jiffies(3000)
+
+#define XRS7000X_SUPPORTED_HSR_FEATURES \
+	(NETIF_F_HW_HSR_TAG_INS | NETIF_F_HW_HSR_TAG_RM | \
+	 NETIF_F_HW_HSR_FWD | NETIF_F_HW_HSR_DUP)
+
+#define XRS7003E_ID	0x100
+#define XRS7003F_ID	0x101
+#define XRS7004E_ID	0x200
+#define XRS7004F_ID	0x201
+
+const struct xrs700x_info xrs7003e_info = {XRS7003E_ID, "XRS7003E", 3};
+EXPORT_SYMBOL(xrs7003e_info);
+
+const struct xrs700x_info xrs7003f_info = {XRS7003F_ID, "XRS7003F", 3};
+EXPORT_SYMBOL(xrs7003f_info);
+
+const struct xrs700x_info xrs7004e_info = {XRS7004E_ID, "XRS7004E", 4};
+EXPORT_SYMBOL(xrs7004e_info);
+
+const struct xrs700x_info xrs7004f_info = {XRS7004F_ID, "XRS7004F", 4};
+EXPORT_SYMBOL(xrs7004f_info);
+
+struct xrs700x_regfield {
+	struct reg_field rf;
+	struct regmap_field **rmf;
+};
+
+struct xrs700x_mib {
+	unsigned int offset;
+	const char *name;
+	int stats64_offset;
+};
+
+#define XRS700X_MIB_ETHTOOL_ONLY(o, n) {o, n, -1}
+#define XRS700X_MIB(o, n, m) {o, n, offsetof(struct rtnl_link_stats64, m)}
+
+static const struct xrs700x_mib xrs700x_mibs[] = {
+	XRS700X_MIB(XRS_RX_GOOD_OCTETS_L, "rx_good_octets", rx_bytes),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_BAD_OCTETS_L, "rx_bad_octets"),
+	XRS700X_MIB(XRS_RX_UNICAST_L, "rx_unicast", rx_packets),
+	XRS700X_MIB(XRS_RX_BROADCAST_L, "rx_broadcast", rx_packets),
+	XRS700X_MIB(XRS_RX_MULTICAST_L, "rx_multicast", multicast),
+	XRS700X_MIB(XRS_RX_UNDERSIZE_L, "rx_undersize", rx_length_errors),
+	XRS700X_MIB(XRS_RX_FRAGMENTS_L, "rx_fragments", rx_length_errors),
+	XRS700X_MIB(XRS_RX_OVERSIZE_L, "rx_oversize", rx_length_errors),
+	XRS700X_MIB(XRS_RX_JABBER_L, "rx_jabber", rx_length_errors),
+	XRS700X_MIB(XRS_RX_ERR_L, "rx_err", rx_errors),
+	XRS700X_MIB(XRS_RX_CRC_L, "rx_crc", rx_crc_errors),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_64_L, "rx_64"),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_65_127_L, "rx_65_127"),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_128_255_L, "rx_128_255"),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_256_511_L, "rx_256_511"),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_512_1023_L, "rx_512_1023"),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_1024_1536_L, "rx_1024_1536"),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_HSR_PRP_L, "rx_hsr_prp"),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_WRONGLAN_L, "rx_wronglan"),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_RX_DUPLICATE_L, "rx_duplicate"),
+	XRS700X_MIB(XRS_TX_OCTETS_L, "tx_octets", tx_bytes),
+	XRS700X_MIB(XRS_TX_UNICAST_L, "tx_unicast", tx_packets),
+	XRS700X_MIB(XRS_TX_BROADCAST_L, "tx_broadcast", tx_packets),
+	XRS700X_MIB(XRS_TX_MULTICAST_L, "tx_multicast", tx_packets),
+	XRS700X_MIB_ETHTOOL_ONLY(XRS_TX_HSR_PRP_L, "tx_hsr_prp"),
+	XRS700X_MIB(XRS_PRIQ_DROP_L, "priq_drop", tx_dropped),
+	XRS700X_MIB(XRS_EARLY_DROP_L, "early_drop", tx_dropped),
+};
+
+static const u8 eth_hsrsup_addr[ETH_ALEN] = {
+	0x01, 0x15, 0x4e, 0x00, 0x01, 0x00};
+
+static void xrs700x_get_strings(struct dsa_switch *ds, int port,
+				u32 stringset, u8 *data)
+{
+	int i;
+
+	if (stringset != ETH_SS_STATS)
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(xrs700x_mibs); i++) {
+		strscpy(data, xrs700x_mibs[i].name, ETH_GSTRING_LEN);
+		data += ETH_GSTRING_LEN;
+	}
+}
+
+static int xrs700x_get_sset_count(struct dsa_switch *ds, int port, int sset)
+{
+	if (sset != ETH_SS_STATS)
+		return -EOPNOTSUPP;
+
+	return ARRAY_SIZE(xrs700x_mibs);
+}
+
+static void xrs700x_read_port_counters(struct xrs700x *priv, int port)
+{
+	struct xrs700x_port *p = &priv->ports[port];
+	struct rtnl_link_stats64 stats;
+	unsigned long flags;
+	int i;
+
+	memset(&stats, 0, sizeof(stats));
+
+	mutex_lock(&p->mib_mutex);
+
+	/* Capture counter values */
+	regmap_write(priv->regmap, XRS_CNT_CTRL(port), 1);
+
+	for (i = 0; i < ARRAY_SIZE(xrs700x_mibs); i++) {
+		unsigned int high = 0, low = 0, reg;
+
+		reg = xrs700x_mibs[i].offset + XRS_PORT_OFFSET * port;
+		regmap_read(priv->regmap, reg, &low);
+		regmap_read(priv->regmap, reg + 2, &high);
+
+		p->mib_data[i] += (high << 16) | low;
+
+		if (xrs700x_mibs[i].stats64_offset >= 0) {
+			u8 *s = (u8 *)&stats + xrs700x_mibs[i].stats64_offset;
+			*(u64 *)s += p->mib_data[i];
+		}
+	}
+
+	/* multicast must be added to rx_packets (which already includes
+	 * unicast and broadcast)
+	 */
+	stats.rx_packets += stats.multicast;
+
+	flags = u64_stats_update_begin_irqsave(&p->syncp);
+	p->stats64 = stats;
+	u64_stats_update_end_irqrestore(&p->syncp, flags);
+
+	mutex_unlock(&p->mib_mutex);
+}
+
+static void xrs700x_mib_work(struct work_struct *work)
+{
+	struct xrs700x *priv = container_of(work, struct xrs700x,
+					    mib_work.work);
+	int i;
+
+	for (i = 0; i < priv->ds->num_ports; i++)
+		xrs700x_read_port_counters(priv, i);
+
+	schedule_delayed_work(&priv->mib_work, XRS700X_MIB_INTERVAL);
+}
+
+static void xrs700x_get_ethtool_stats(struct dsa_switch *ds, int port,
+				      u64 *data)
+{
+	struct xrs700x *priv = ds->priv;
+	struct xrs700x_port *p = &priv->ports[port];
+
+	xrs700x_read_port_counters(priv, port);
+
+	mutex_lock(&p->mib_mutex);
+	memcpy(data, p->mib_data, sizeof(*data) * ARRAY_SIZE(xrs700x_mibs));
+	mutex_unlock(&p->mib_mutex);
+}
+
+static void xrs700x_get_stats64(struct dsa_switch *ds, int port,
+				struct rtnl_link_stats64 *s)
+{
+	struct xrs700x *priv = ds->priv;
+	struct xrs700x_port *p = &priv->ports[port];
+	unsigned int start;
+
+	do {
+		start = u64_stats_fetch_begin(&p->syncp);
+		*s = p->stats64;
+	} while (u64_stats_fetch_retry(&p->syncp, start));
+}
+
+static int xrs700x_setup_regmap_range(struct xrs700x *priv)
+{
+	struct xrs700x_regfield regfields[] = {
+		{
+			.rf = REG_FIELD_ID(XRS_PORT_STATE(0), 0, 1,
+					   priv->ds->num_ports,
+					   XRS_PORT_OFFSET),
+			.rmf = &priv->ps_forward
+		},
+		{
+			.rf = REG_FIELD_ID(XRS_PORT_STATE(0), 2, 3,
+					   priv->ds->num_ports,
+					   XRS_PORT_OFFSET),
+			.rmf = &priv->ps_management
+		},
+		{
+			.rf = REG_FIELD_ID(XRS_PORT_STATE(0), 4, 9,
+					   priv->ds->num_ports,
+					   XRS_PORT_OFFSET),
+			.rmf = &priv->ps_sel_speed
+		},
+		{
+			.rf = REG_FIELD_ID(XRS_PORT_STATE(0), 10, 11,
+					   priv->ds->num_ports,
+					   XRS_PORT_OFFSET),
+			.rmf = &priv->ps_cur_speed
+		}
+	};
+	int i = 0;
+
+	for (; i < ARRAY_SIZE(regfields); i++) {
+		*regfields[i].rmf = devm_regmap_field_alloc(priv->dev,
+							    priv->regmap,
+							    regfields[i].rf);
+		if (IS_ERR(*regfields[i].rmf))
+			return PTR_ERR(*regfields[i].rmf);
+	}
+
+	return 0;
+}
+
+static enum dsa_tag_protocol xrs700x_get_tag_protocol(struct dsa_switch *ds,
+						      int port,
+						      enum dsa_tag_protocol m)
+{
+	return DSA_TAG_PROTO_XRS700X;
+}
+
+static int xrs700x_reset(struct dsa_switch *ds)
+{
+	struct xrs700x *priv = ds->priv;
+	unsigned int val;
+	int ret;
+
+	ret = regmap_write(priv->regmap, XRS_GENERAL, XRS_GENERAL_RESET);
+	if (ret)
+		goto error;
+
+	ret = regmap_read_poll_timeout(priv->regmap, XRS_GENERAL,
+				       val, !(val & XRS_GENERAL_RESET),
+				       10, 1000);
+error:
+	if (ret) {
+		dev_err_ratelimited(priv->dev, "error resetting switch: %d\n",
+				    ret);
+	}
+
+	return ret;
+}
+
+static void xrs700x_port_stp_state_set(struct dsa_switch *ds, int port,
+				       u8 state)
+{
+	struct xrs700x *priv = ds->priv;
+	unsigned int bpdus = 1;
+	unsigned int val;
+
+	switch (state) {
+	case BR_STATE_DISABLED:
+		bpdus = 0;
+		fallthrough;
+	case BR_STATE_BLOCKING:
+	case BR_STATE_LISTENING:
+		val = XRS_PORT_DISABLED;
+		break;
+	case BR_STATE_LEARNING:
+		val = XRS_PORT_LEARNING;
+		break;
+	case BR_STATE_FORWARDING:
+		val = XRS_PORT_FORWARDING;
+		break;
+	default:
+		dev_err(ds->dev, "invalid STP state: %d\n", state);
+		return;
+	}
+
+	regmap_fields_write(priv->ps_forward, port, val);
+
+	/* Enable/disable inbound policy added by xrs700x_port_add_bpdu_ipf()
+	 * which allows BPDU forwarding to the CPU port when the front facing
+	 * port is in disabled/learning state.
+	 */
+	regmap_update_bits(priv->regmap, XRS_ETH_ADDR_CFG(port, 0), 1, bpdus);
+
+	dev_dbg_ratelimited(priv->dev, "%s - port: %d, state: %u, val: 0x%x\n",
+			    __func__, port, state, val);
+}
+
+/* Add an inbound policy filter which matches the BPDU destination MAC
+ * and forwards to the CPU port. Leave the policy disabled, it will be
+ * enabled as needed.
+ */
+static int xrs700x_port_add_bpdu_ipf(struct dsa_switch *ds, int port)
+{
+	struct xrs700x *priv = ds->priv;
+	unsigned int val = 0;
+	int i = 0;
+	int ret;
+
+	/* Compare all 48 bits of the destination MAC address. */
+	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_CFG(port, 0), 48 << 2);
+	if (ret)
+		return ret;
+
+	/* match BPDU destination 01:80:c2:00:00:00 */
+	for (i = 0; i < sizeof(eth_stp_addr); i += 2) {
+		ret = regmap_write(priv->regmap, XRS_ETH_ADDR_0(port, 0) + i,
+				   eth_stp_addr[i] |
+				   (eth_stp_addr[i + 1] << 8));
+		if (ret)
+			return ret;
+	}
+
+	/* Mirror BPDU to CPU port */
+	for (i = 0; i < ds->num_ports; i++) {
+		if (dsa_is_cpu_port(ds, i))
+			val |= BIT(i);
+	}
+
+	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_FWD_MIRROR(port, 0), val);
+	if (ret)
+		return ret;
+
+	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_FWD_ALLOW(port, 0), 0);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/* Add an inbound policy filter which matches the HSR/PRP supervision MAC
+ * range and forwards to the CPU port without discarding duplicates.
+ * This is required to correctly populate the HSR/PRP node_table.
+ * Leave the policy disabled, it will be enabled as needed.
+ */
+static int xrs700x_port_add_hsrsup_ipf(struct dsa_switch *ds, int port,
+				       int fwdport)
+{
+	struct xrs700x *priv = ds->priv;
+	unsigned int val = 0;
+	int i = 0;
+	int ret;
+
+	/* Compare 40 bits of the destination MAC address. */
+	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_CFG(port, 1), 40 << 2);
+	if (ret)
+		return ret;
+
+	/* match HSR/PRP supervision destination 01:15:4e:00:01:XX */
+	for (i = 0; i < sizeof(eth_hsrsup_addr); i += 2) {
+		ret = regmap_write(priv->regmap, XRS_ETH_ADDR_0(port, 1) + i,
+				   eth_hsrsup_addr[i] |
+				   (eth_hsrsup_addr[i + 1] << 8));
+		if (ret)
+			return ret;
+	}
+
+	/* Mirror HSR/PRP supervision to CPU port */
+	for (i = 0; i < ds->num_ports; i++) {
+		if (dsa_is_cpu_port(ds, i))
+			val |= BIT(i);
+	}
+
+	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_FWD_MIRROR(port, 1), val);
+	if (ret)
+		return ret;
+
+	if (fwdport >= 0)
+		val |= BIT(fwdport);
+
+	/* Allow must be set prevent duplicate discard */
+	ret = regmap_write(priv->regmap, XRS_ETH_ADDR_FWD_ALLOW(port, 1), val);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int xrs700x_port_setup(struct dsa_switch *ds, int port)
+{
+	bool cpu_port = dsa_is_cpu_port(ds, port);
+	struct xrs700x *priv = ds->priv;
+	unsigned int val = 0;
+	int ret, i;
+
+	xrs700x_port_stp_state_set(ds, port, BR_STATE_DISABLED);
+
+	/* Disable forwarding to non-CPU ports */
+	for (i = 0; i < ds->num_ports; i++) {
+		if (!dsa_is_cpu_port(ds, i))
+			val |= BIT(i);
+	}
+
+	/* 1 = Disable forwarding to the port */
+	ret = regmap_write(priv->regmap, XRS_PORT_FWD_MASK(port), val);
+	if (ret)
+		return ret;
+
+	val = cpu_port ? XRS_PORT_MODE_MANAGEMENT : XRS_PORT_MODE_NORMAL;
+	ret = regmap_fields_write(priv->ps_management, port, val);
+	if (ret)
+		return ret;
+
+	if (!cpu_port) {
+		ret = xrs700x_port_add_bpdu_ipf(ds, port);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int xrs700x_setup(struct dsa_switch *ds)
+{
+	struct xrs700x *priv = ds->priv;
+	int ret, i;
+
+	ret = xrs700x_reset(ds);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < ds->num_ports; i++) {
+		ret = xrs700x_port_setup(ds, i);
+		if (ret)
+			return ret;
+	}
+
+	schedule_delayed_work(&priv->mib_work, XRS700X_MIB_INTERVAL);
+
+	return 0;
+}
+
+static void xrs700x_teardown(struct dsa_switch *ds)
+{
+	struct xrs700x *priv = ds->priv;
+
+	cancel_delayed_work_sync(&priv->mib_work);
+}
+
+static void xrs700x_phylink_get_caps(struct dsa_switch *ds, int port,
+				     struct phylink_config *config)
+{
+	switch (port) {
+	case 0:
+		__set_bit(PHY_INTERFACE_MODE_RMII,
+			  config->supported_interfaces);
+		config->mac_capabilities = MAC_10FD | MAC_100FD;
+		break;
+
+	case 1:
+	case 2:
+	case 3:
+		phy_interface_set_rgmii(config->supported_interfaces);
+		config->mac_capabilities = MAC_10FD | MAC_100FD | MAC_1000FD;
+		break;
+
+	default:
+		dev_err(ds->dev, "Unsupported port: %i\n", port);
+		break;
+	}
+}
+
+static void xrs700x_mac_link_up(struct dsa_switch *ds, int port,
+				unsigned int mode, phy_interface_t interface,
+				struct phy_device *phydev,
+				int speed, int duplex,
+				bool tx_pause, bool rx_pause)
+{
+	struct xrs700x *priv = ds->priv;
+	unsigned int val;
+
+	switch (speed) {
+	case SPEED_1000:
+		val = XRS_PORT_SPEED_1000;
+		break;
+	case SPEED_100:
+		val = XRS_PORT_SPEED_100;
+		break;
+	case SPEED_10:
+		val = XRS_PORT_SPEED_10;
+		break;
+	default:
+		return;
+	}
+
+	regmap_fields_write(priv->ps_sel_speed, port, val);
+
+	dev_dbg_ratelimited(priv->dev, "%s: port: %d mode: %u speed: %u\n",
+			    __func__, port, mode, speed);
+}
+
+static int xrs700x_bridge_common(struct dsa_switch *ds, int port,
+				 struct dsa_bridge bridge, bool join)
+{
+	unsigned int i, cpu_mask = 0, mask = 0;
+	struct xrs700x *priv = ds->priv;
+	int ret;
+
+	for (i = 0; i < ds->num_ports; i++) {
+		if (dsa_is_cpu_port(ds, i))
+			continue;
+
+		cpu_mask |= BIT(i);
+
+		if (dsa_port_offloads_bridge(dsa_to_port(ds, i), &bridge))
+			continue;
+
+		mask |= BIT(i);
+	}
+
+	for (i = 0; i < ds->num_ports; i++) {
+		if (!dsa_port_offloads_bridge(dsa_to_port(ds, i), &bridge))
+			continue;
+
+		/* 1 = Disable forwarding to the port */
+		ret = regmap_write(priv->regmap, XRS_PORT_FWD_MASK(i), mask);
+		if (ret)
+			return ret;
+	}
+
+	if (!join) {
+		ret = regmap_write(priv->regmap, XRS_PORT_FWD_MASK(port),
+				   cpu_mask);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int xrs700x_bridge_join(struct dsa_switch *ds, int port,
+			       struct dsa_bridge bridge, bool *tx_fwd_offload,
+			       struct netlink_ext_ack *extack)
+{
+	return xrs700x_bridge_common(ds, port, bridge, true);
+}
+
+static void xrs700x_bridge_leave(struct dsa_switch *ds, int port,
+				 struct dsa_bridge bridge)
+{
+	xrs700x_bridge_common(ds, port, bridge, false);
+}
+
+static int xrs700x_hsr_join(struct dsa_switch *ds, int port,
+			    struct net_device *hsr)
+{
+	unsigned int val = XRS_HSR_CFG_HSR_PRP;
+	struct dsa_port *partner = NULL, *dp;
+	struct xrs700x *priv = ds->priv;
+	struct net_device *slave;
+	int ret, i, hsr_pair[2];
+	enum hsr_version ver;
+	bool fwd = false;
+
+	ret = hsr_get_version(hsr, &ver);
+	if (ret)
+		return ret;
+
+	/* Only ports 1 and 2 can be HSR/PRP redundant ports. */
+	if (port != 1 && port != 2)
+		return -EOPNOTSUPP;
+
+	if (ver == HSR_V1)
+		val |= XRS_HSR_CFG_HSR;
+	else if (ver == PRP_V1)
+		val |= XRS_HSR_CFG_PRP;
+	else
+		return -EOPNOTSUPP;
+
+	dsa_hsr_foreach_port(dp, ds, hsr) {
+		if (dp->index != port) {
+			partner = dp;
+			break;
+		}
+	}
+
+	/* We can't enable redundancy on the switch until both
+	 * redundant ports have signed up.
+	 */
+	if (!partner)
+		return 0;
+
+	regmap_fields_write(priv->ps_forward, partner->index,
+			    XRS_PORT_DISABLED);
+	regmap_fields_write(priv->ps_forward, port, XRS_PORT_DISABLED);
+
+	regmap_write(priv->regmap, XRS_HSR_CFG(partner->index),
+		     val | XRS_HSR_CFG_LANID_A);
+	regmap_write(priv->regmap, XRS_HSR_CFG(port),
+		     val | XRS_HSR_CFG_LANID_B);
+
+	/* Clear bits for both redundant ports (HSR only) and the CPU port to
+	 * enable forwarding.
+	 */
+	val = GENMASK(ds->num_ports - 1, 0);
+	if (ver == HSR_V1) {
+		val &= ~BIT(partner->index);
+		val &= ~BIT(port);
+		fwd = true;
+	}
+	val &= ~BIT(dsa_upstream_port(ds, port));
+	regmap_write(priv->regmap, XRS_PORT_FWD_MASK(partner->index), val);
+	regmap_write(priv->regmap, XRS_PORT_FWD_MASK(port), val);
+
+	regmap_fields_write(priv->ps_forward, partner->index,
+			    XRS_PORT_FORWARDING);
+	regmap_fields_write(priv->ps_forward, port, XRS_PORT_FORWARDING);
+
+	/* Enable inbound policy which allows HSR/PRP supervision forwarding
+	 * to the CPU port without discarding duplicates. Continue to
+	 * forward to redundant ports when in HSR mode while discarding
+	 * duplicates.
+	 */
+	ret = xrs700x_port_add_hsrsup_ipf(ds, partner->index, fwd ? port : -1);
+	if (ret)
+		return ret;
+
+	ret = xrs700x_port_add_hsrsup_ipf(ds, port, fwd ? partner->index : -1);
+	if (ret)
+		return ret;
+
+	regmap_update_bits(priv->regmap,
+			   XRS_ETH_ADDR_CFG(partner->index, 1), 1, 1);
+	regmap_update_bits(priv->regmap, XRS_ETH_ADDR_CFG(port, 1), 1, 1);
+
+	hsr_pair[0] = port;
+	hsr_pair[1] = partner->index;
+	for (i = 0; i < ARRAY_SIZE(hsr_pair); i++) {
+		slave = dsa_to_port(ds, hsr_pair[i])->slave;
+		slave->features |= XRS7000X_SUPPORTED_HSR_FEATURES;
+	}
+
+	return 0;
+}
+
+static int xrs700x_hsr_leave(struct dsa_switch *ds, int port,
+			     struct net_device *hsr)
+{
+	struct dsa_port *partner = NULL, *dp;
+	struct xrs700x *priv = ds->priv;
+	struct net_device *slave;
+	int i, hsr_pair[2];
+	unsigned int val;
+
+	dsa_hsr_foreach_port(dp, ds, hsr) {
+		if (dp->index != port) {
+			partner = dp;
+			break;
+		}
+	}
+
+	if (!partner)
+		return 0;
+
+	regmap_fields_write(priv->ps_forward, partner->index,
+			    XRS_PORT_DISABLED);
+	regmap_fields_write(priv->ps_forward, port, XRS_PORT_DISABLED);
+
+	regmap_write(priv->regmap, XRS_HSR_CFG(partner->index), 0);
+	regmap_write(priv->regmap, XRS_HSR_CFG(port), 0);
+
+	/* Clear bit for the CPU port to enable forwarding. */
+	val = GENMASK(ds->num_ports - 1, 0);
+	val &= ~BIT(dsa_upstream_port(ds, port));
+	regmap_write(priv->regmap, XRS_PORT_FWD_MASK(partner->index), val);
+	regmap_write(priv->regmap, XRS_PORT_FWD_MASK(port), val);
+
+	regmap_fields_write(priv->ps_forward, partner->index,
+			    XRS_PORT_FORWARDING);
+	regmap_fields_write(priv->ps_forward, port, XRS_PORT_FORWARDING);
+
+	/* Disable inbound policy added by xrs700x_port_add_hsrsup_ipf()
+	 * which allows HSR/PRP supervision forwarding to the CPU port without
+	 * discarding duplicates.
+	 */
+	regmap_update_bits(priv->regmap,
+			   XRS_ETH_ADDR_CFG(partner->index, 1), 1, 0);
+	regmap_update_bits(priv->regmap, XRS_ETH_ADDR_CFG(port, 1), 1, 0);
+
+	hsr_pair[0] = port;
+	hsr_pair[1] = partner->index;
+	for (i = 0; i < ARRAY_SIZE(hsr_pair); i++) {
+		slave = dsa_to_port(ds, hsr_pair[i])->slave;
+		slave->features &= ~XRS7000X_SUPPORTED_HSR_FEATURES;
+	}
+
+	return 0;
+}
+
+static const struct dsa_switch_ops xrs700x_ops = {
+	.get_tag_protocol	= xrs700x_get_tag_protocol,
+	.setup			= xrs700x_setup,
+	.teardown		= xrs700x_teardown,
+	.port_stp_state_set	= xrs700x_port_stp_state_set,
+	.phylink_get_caps	= xrs700x_phylink_get_caps,
+	.phylink_mac_link_up	= xrs700x_mac_link_up,
+	.get_strings		= xrs700x_get_strings,
+	.get_sset_count		= xrs700x_get_sset_count,
+	.get_ethtool_stats	= xrs700x_get_ethtool_stats,
+	.get_stats64		= xrs700x_get_stats64,
+	.port_bridge_join	= xrs700x_bridge_join,
+	.port_bridge_leave	= xrs700x_bridge_leave,
+	.port_hsr_join		= xrs700x_hsr_join,
+	.port_hsr_leave		= xrs700x_hsr_leave,
+};
+
+static int xrs700x_detect(struct xrs700x *priv)
+{
+	const struct xrs700x_info *info;
+	unsigned int id;
+	int ret;
+
+	ret = regmap_read(priv->regmap, XRS_DEV_ID0, &id);
+	if (ret) {
+		dev_err(priv->dev, "error %d while reading switch id.\n",
+			ret);
+		return ret;
+	}
+
+	info = of_device_get_match_data(priv->dev);
+	if (!info)
+		return -EINVAL;
+
+	if (info->id == id) {
+		priv->ds->num_ports = info->num_ports;
+		dev_info(priv->dev, "%s detected.\n", info->name);
+		return 0;
+	}
+
+	dev_err(priv->dev, "expected switch id 0x%x but found 0x%x.\n",
+		info->id, id);
+
+	return -ENODEV;
+}
+
+struct xrs700x *xrs700x_switch_alloc(struct device *base, void *devpriv)
+{
+	struct dsa_switch *ds;
+	struct xrs700x *priv;
+
+	ds = devm_kzalloc(base, sizeof(*ds), GFP_KERNEL);
+	if (!ds)
+		return NULL;
+
+	ds->dev = base;
+
+	priv = devm_kzalloc(base, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return NULL;
+
+	INIT_DELAYED_WORK(&priv->mib_work, xrs700x_mib_work);
+
+	ds->ops = &xrs700x_ops;
+	ds->priv = priv;
+	priv->dev = base;
+
+	priv->ds = ds;
+	priv->priv = devpriv;
+
+	return priv;
+}
+EXPORT_SYMBOL(xrs700x_switch_alloc);
+
+static int xrs700x_alloc_port_mib(struct xrs700x *priv, int port)
+{
+	struct xrs700x_port *p = &priv->ports[port];
+
+	p->mib_data = devm_kcalloc(priv->dev, ARRAY_SIZE(xrs700x_mibs),
+				   sizeof(*p->mib_data), GFP_KERNEL);
+	if (!p->mib_data)
+		return -ENOMEM;
+
+	mutex_init(&p->mib_mutex);
+	u64_stats_init(&p->syncp);
+
+	return 0;
+}
+
+int xrs700x_switch_register(struct xrs700x *priv)
+{
+	int ret;
+	int i;
+
+	ret = xrs700x_detect(priv);
+	if (ret)
+		return ret;
+
+	ret = xrs700x_setup_regmap_range(priv);
+	if (ret)
+		return ret;
+
+	priv->ports = devm_kcalloc(priv->dev, priv->ds->num_ports,
+				   sizeof(*priv->ports), GFP_KERNEL);
+	if (!priv->ports)
+		return -ENOMEM;
+
+	for (i = 0; i < priv->ds->num_ports; i++) {
+		ret = xrs700x_alloc_port_mib(priv, i);
+		if (ret)
+			return ret;
+	}
+
+	return dsa_register_switch(priv->ds);
+}
+EXPORT_SYMBOL(xrs700x_switch_register);
+
+void xrs700x_switch_remove(struct xrs700x *priv)
+{
+	dsa_unregister_switch(priv->ds);
+}
+EXPORT_SYMBOL(xrs700x_switch_remove);
+
+void xrs700x_switch_shutdown(struct xrs700x *priv)
+{
+	dsa_switch_shutdown(priv->ds);
+}
+EXPORT_SYMBOL(xrs700x_switch_shutdown);
+
+MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>");
+MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA driver");
+MODULE_LICENSE("GPL v2");