net: Add MSCC ServalT network driver.

Add network driver for Microsemi Ethernet switch.
It is present on ServalT SoCs.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

3 files changed, 630 insertions, 0 deletions

diff --git a/drivers/net/mscc_eswitch/Kconfig b/drivers/net/mscc_eswitch/Kconfig
index 3f9d14bee1..6359d0b610 100644
--- a/drivers/net/mscc_eswitch/Kconfig
+++ b/drivers/net/mscc_eswitch/Kconfig
@@ -22,3 +22,10 @@ config MSCC_JR2_SWITCH
 	select PHYLIB
 	help
 	  This driver supports the Jaguar2 network switch device.
+
+config MSCC_SERVALT_SWITCH
+	bool "Servalt switch driver"
+	depends on DM_ETH && ARCH_MSCC
+	select PHYLIB
+	help
+	  This driver supports the Servalt network switch device.
diff --git a/drivers/net/mscc_eswitch/Makefile b/drivers/net/mscc_eswitch/Makefile
index 0a1b8632a9..bffd8ec77b 100644
--- a/drivers/net/mscc_eswitch/Makefile
+++ b/drivers/net/mscc_eswitch/Makefile
@@ -2,3 +2,4 @@
 obj-$(CONFIG_MSCC_OCELOT_SWITCH) += ocelot_switch.o mscc_miim.o mscc_xfer.o mscc_mac_table.o
 obj-$(CONFIG_MSCC_LUTON_SWITCH) += luton_switch.o mscc_miim.o mscc_xfer.o mscc_mac_table.o
 obj-$(CONFIG_MSCC_JR2_SWITCH) += jr2_switch.o mscc_xfer.o
+obj-$(CONFIG_MSCC_SERVALT_SWITCH) += servalt_switch.o mscc_xfer.o
diff --git a/drivers/net/mscc_eswitch/servalt_switch.c b/drivers/net/mscc_eswitch/servalt_switch.c
new file mode 100644
index 0000000000..995c62309d
--- /dev/null
+++ b/drivers/net/mscc_eswitch/servalt_switch.c
@@ -0,0 +1,622 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2019 Microsemi Corporation
+ */
+
+#include <common.h>
+#include <config.h>
+#include <dm.h>
+#include <dm/of_access.h>
+#include <dm/of_addr.h>
+#include <fdt_support.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <miiphy.h>
+#include <net.h>
+#include <wait_bit.h>
+
+#include "mscc_xfer.h"
+
+#define GCB_MIIM_MII_STATUS		0x0
+#define		GCB_MIIM_STAT_BUSY		BIT(3)
+#define GCB_MIIM_MII_CMD		0x8
+#define		GCB_MIIM_MII_CMD_OPR_WRITE	BIT(1)
+#define		GCB_MIIM_MII_CMD_OPR_READ	BIT(2)
+#define		GCB_MIIM_MII_CMD_WRDATA(x)	((x) << 4)
+#define		GCB_MIIM_MII_CMD_REGAD(x)	((x) << 20)
+#define		GCB_MIIM_MII_CMD_PHYAD(x)	((x) << 25)
+#define		GCB_MIIM_MII_CMD_VLD		BIT(31)
+#define GCB_MIIM_DATA			0xC
+#define		GCB_MIIM_DATA_ERROR		(0x3 << 16)
+
+#define PHY_CFG				0x0
+#define PHY_CFG_ENA				0x3
+#define PHY_CFG_COMMON_RST			BIT(2)
+#define PHY_CFG_RST				(0x3 << 3)
+#define PHY_STAT			0x4
+#define PHY_STAT_SUPERVISOR_COMPLETE		BIT(0)
+
+#define ANA_AC_RAM_CTRL_RAM_INIT		0x14fdc
+#define ANA_AC_STAT_GLOBAL_CFG_PORT_RESET	0x15474
+
+#define ANA_CL_PORT_VLAN_CFG(x)			(0xa018 + 0xc8 * (x))
+#define		ANA_CL_PORT_VLAN_CFG_AWARE_ENA			BIT(19)
+#define		ANA_CL_PORT_VLAN_CFG_POP_CNT(x)			((x) << 17)
+
+#define ANA_L2_COMMON_FWD_CFG			0x18498
+#define		ANA_L2_COMMON_FWD_CFG_CPU_DMAC_COPY_ENA	BIT(6)
+
+#define ASM_CFG_STAT_CFG			0xb08
+#define ASM_CFG_PORT(x)				(0xb74 + 0x4 * (x))
+#define		ASM_CFG_PORT_NO_PREAMBLE_ENA		BIT(8)
+#define		ASM_CFG_PORT_INJ_FORMAT_CFG(x)		((x) << 1)
+#define ASM_RAM_CTRL_RAM_INIT			0xbfc
+
+#define DEV_DEV_CFG_DEV_RST_CTRL	0x0
+#define		DEV_DEV_CFG_DEV_RST_CTRL_SPEED_SEL(x)	((x) << 20)
+#define DEV_MAC_CFG_MAC_ENA		0x24
+#define		DEV_MAC_CFG_MAC_ENA_RX_ENA		BIT(4)
+#define		DEV_MAC_CFG_MAC_ENA_TX_ENA		BIT(0)
+#define DEV_MAC_CFG_MAC_IFG		0x3c
+#define		DEV_MAC_CFG_MAC_IFG_TX_IFG(x)		((x) << 8)
+#define		DEV_MAC_CFG_MAC_IFG_RX_IFG2(x)		((x) << 4)
+#define		DEV_MAC_CFG_MAC_IFG_RX_IFG1(x)		(x)
+#define DEV_PCS1G_CFG_PCS1G_CFG		0x48
+#define		DEV_PCS1G_CFG_PCS1G_CFG_PCS_ENA		BIT(0)
+#define DEV_PCS1G_CFG_PCS1G_MODE	0x4c
+#define DEV_PCS1G_CFG_PCS1G_SD		0x50
+#define DEV_PCS1G_CFG_PCS1G_ANEG	0x54
+#define		DEV_PCS1G_CFG_PCS1G_ANEG_ADV_ABILITY(x)	((x) << 16)
+
+#define LRN_COMMON_ACCESS_CTRL			0x0
+#define		LRN_COMMON_ACCESS_CTRL_MAC_TABLE_ACCESS_SHOT	BIT(0)
+#define LRN_COMMON_MAC_ACCESS_CFG0		0x4
+#define LRN_COMMON_MAC_ACCESS_CFG1		0x8
+#define LRN_COMMON_MAC_ACCESS_CFG2		0xc
+#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_ADDR(x)	(x)
+#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_TYPE(x)	((x) << 12)
+#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_VLD	BIT(15)
+#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_LOCKED	BIT(16)
+#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_COPY	BIT(23)
+#define		LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_QU(x)	((x) << 24)
+
+#define QFWD_SYSTEM_SWITCH_PORT_MODE(x)		(0x4400 + 0x4 * (x))
+#define		QFWD_SYSTEM_SWITCH_PORT_MODE_PORT_ENA		BIT(17)
+
+#define QS_XTR_GRP_CFG(x)		(4 * (x))
+#define QS_INJ_GRP_CFG(x)		(0x24 + (x) * 4)
+
+#define QSYS_SYSTEM_RESET_CFG			0x1048
+#define QSYS_CALCFG_CAL_AUTO			0x1134
+#define QSYS_CALCFG_CAL_CTRL			0x113c
+#define		QSYS_CALCFG_CAL_CTRL_CAL_MODE(x)		((x) << 11)
+#define QSYS_RAM_CTRL_RAM_INIT			0x1140
+
+#define REW_RAM_CTRL_RAM_INIT			0xFFF4
+
+#define MAC_VID			0
+#define CPU_PORT		11
+#define IFH_LEN			7
+#define ETH_ALEN		6
+#define PGID_BROADCAST		50
+#define PGID_UNICAST		51
+
+static const char * const regs_names[] = {
+	"port0", "port1",
+	"ana_ac", "ana_cl", "ana_l2", "asm", "lrn", "qfwd", "qs", "qsys", "rew",
+};
+
+#define REGS_NAMES_COUNT ARRAY_SIZE(regs_names) + 1
+#define MAX_PORT 2
+
+enum servalt_ctrl_regs {
+	ANA_AC = MAX_PORT,
+	ANA_CL,
+	ANA_L2,
+	ASM,
+	LRN,
+	QFWD,
+	QS,
+	QSYS,
+	REW,
+};
+
+#define SERVALT_MIIM_BUS_COUNT 2
+
+struct servalt_phy_port_t {
+	size_t phy_addr;
+	struct mii_dev *bus;
+};
+
+struct servalt_private {
+	void __iomem *regs[REGS_NAMES_COUNT];
+	struct mii_dev *bus[SERVALT_MIIM_BUS_COUNT];
+	struct servalt_phy_port_t ports[MAX_PORT];
+};
+
+struct mscc_miim_dev {
+	void __iomem *regs;
+	phys_addr_t miim_base;
+	unsigned long miim_size;
+	struct mii_dev *bus;
+};
+
+static const unsigned long servalt_regs_qs[] = {
+	[MSCC_QS_XTR_RD] = 0x8,
+	[MSCC_QS_XTR_FLUSH] = 0x18,
+	[MSCC_QS_XTR_DATA_PRESENT] = 0x1c,
+	[MSCC_QS_INJ_WR] = 0x2c,
+	[MSCC_QS_INJ_CTRL] = 0x34,
+};
+
+static struct mscc_miim_dev miim[SERVALT_MIIM_BUS_COUNT];
+static int miim_count = -1;
+
+static int mscc_miim_wait_ready(struct mscc_miim_dev *miim)
+{
+	return wait_for_bit_le32(miim->regs + GCB_MIIM_MII_STATUS,
+				 GCB_MIIM_STAT_BUSY, false, 250, false);
+}
+
+static int mscc_miim_read(struct mii_dev *bus, int addr, int devad, int reg)
+{
+	struct mscc_miim_dev *miim = (struct mscc_miim_dev *)bus->priv;
+	u32 val;
+	int ret;
+
+	ret = mscc_miim_wait_ready(miim);
+	if (ret)
+		goto out;
+
+	writel(GCB_MIIM_MII_CMD_VLD | GCB_MIIM_MII_CMD_PHYAD(addr) |
+	       GCB_MIIM_MII_CMD_REGAD(reg) | GCB_MIIM_MII_CMD_OPR_READ,
+	       miim->regs + GCB_MIIM_MII_CMD);
+
+	ret = mscc_miim_wait_ready(miim);
+	if (ret)
+		goto out;
+
+	val = readl(miim->regs + GCB_MIIM_DATA);
+	if (val & GCB_MIIM_DATA_ERROR) {
+		ret = -EIO;
+		goto out;
+	}
+
+	ret = val & 0xFFFF;
+out:
+	return ret;
+}
+
+static int mscc_miim_write(struct mii_dev *bus, int addr, int devad, int reg,
+			   u16 val)
+{
+	struct mscc_miim_dev *miim = (struct mscc_miim_dev *)bus->priv;
+	int ret;
+
+	ret = mscc_miim_wait_ready(miim);
+	if (ret < 0)
+		goto out;
+
+	writel(GCB_MIIM_MII_CMD_VLD | GCB_MIIM_MII_CMD_PHYAD(addr) |
+	       GCB_MIIM_MII_CMD_REGAD(reg) | GCB_MIIM_MII_CMD_WRDATA(val) |
+	       GCB_MIIM_MII_CMD_OPR_WRITE, miim->regs + GCB_MIIM_MII_CMD);
+
+out:
+	return ret;
+}
+
+static struct mii_dev *servalt_mdiobus_init(phys_addr_t miim_base,
+					    unsigned long miim_size)
+{
+	struct mii_dev *bus;
+
+	bus = mdio_alloc();
+	if (!bus)
+		return NULL;
+
+	++miim_count;
+	sprintf(bus->name, "miim-bus%d", miim_count);
+
+	miim[miim_count].regs = ioremap(miim_base, miim_size);
+	miim[miim_count].miim_base = miim_base;
+	miim[miim_count].miim_size = miim_size;
+	bus->priv = &miim[miim_count];
+	bus->read = mscc_miim_read;
+	bus->write = mscc_miim_write;
+
+	if (mdio_register(bus))
+		return NULL;
+
+	miim[miim_count].bus = bus;
+	return bus;
+}
+
+static void mscc_phy_reset(void)
+{
+	writel(0, BASE_DEVCPU_GCB + GCB_PHY_CFG + PHY_CFG);
+	writel(PHY_CFG_RST | PHY_CFG_COMMON_RST
+	       | PHY_CFG_ENA, BASE_DEVCPU_GCB + GCB_PHY_CFG + PHY_CFG);
+	if (wait_for_bit_le32((const void *)(BASE_DEVCPU_GCB + GCB_PHY_CFG) +
+			      PHY_STAT, PHY_STAT_SUPERVISOR_COMPLETE,
+			      true, 2000, false)) {
+		pr_err("Timeout in phy reset\n");
+	}
+}
+
+static void servalt_cpu_capture_setup(struct servalt_private *priv)
+{
+	/* ASM: No preamble and IFH prefix on CPU injected frames */
+	writel(ASM_CFG_PORT_NO_PREAMBLE_ENA |
+	       ASM_CFG_PORT_INJ_FORMAT_CFG(1),
+	       priv->regs[ASM] + ASM_CFG_PORT(CPU_PORT));
+
+	/* Set Manual injection via DEVCPU_QS registers for CPU queue 0 */
+	writel(0x5, priv->regs[QS] + QS_INJ_GRP_CFG(0));
+
+	/* Set Manual extraction via DEVCPU_QS registers for CPU queue 0 */
+	writel(0x7, priv->regs[QS] + QS_XTR_GRP_CFG(0));
+
+	/* Enable CPU port for any frame transfer */
+	setbits_le32(priv->regs[QFWD] + QFWD_SYSTEM_SWITCH_PORT_MODE(CPU_PORT),
+		     QFWD_SYSTEM_SWITCH_PORT_MODE_PORT_ENA);
+
+	/* Send a copy to CPU when found as forwarding entry */
+	setbits_le32(priv->regs[ANA_L2] + ANA_L2_COMMON_FWD_CFG,
+		     ANA_L2_COMMON_FWD_CFG_CPU_DMAC_COPY_ENA);
+}
+
+static void servalt_port_init(struct servalt_private *priv, int port)
+{
+	void __iomem *regs = priv->regs[port];
+
+	/* Enable PCS */
+	writel(DEV_PCS1G_CFG_PCS1G_CFG_PCS_ENA,
+	       regs + DEV_PCS1G_CFG_PCS1G_CFG);
+
+	/* Disable Signal Detect */
+	writel(0, regs + DEV_PCS1G_CFG_PCS1G_SD);
+
+	/* Enable MAC RX and TX */
+	writel(DEV_MAC_CFG_MAC_ENA_RX_ENA |
+	       DEV_MAC_CFG_MAC_ENA_TX_ENA,
+	       regs + DEV_MAC_CFG_MAC_ENA);
+
+	/* Clear sgmii_mode_ena */
+	writel(0, regs + DEV_PCS1G_CFG_PCS1G_MODE);
+
+	/*
+	 * Clear sw_resolve_ena(bit 0) and set adv_ability to
+	 * something meaningful just in case
+	 */
+	writel(DEV_PCS1G_CFG_PCS1G_ANEG_ADV_ABILITY(0x20),
+	       regs + DEV_PCS1G_CFG_PCS1G_ANEG);
+
+	/* Set MAC IFG Gaps */
+	writel(DEV_MAC_CFG_MAC_IFG_TX_IFG(4) |
+	       DEV_MAC_CFG_MAC_IFG_RX_IFG1(5) |
+	       DEV_MAC_CFG_MAC_IFG_RX_IFG2(1),
+	       regs + DEV_MAC_CFG_MAC_IFG);
+
+	/* Set link speed and release all resets */
+	writel(DEV_DEV_CFG_DEV_RST_CTRL_SPEED_SEL(2),
+	       regs + DEV_DEV_CFG_DEV_RST_CTRL);
+
+	/* Make VLAN aware for CPU traffic */
+	writel(ANA_CL_PORT_VLAN_CFG_AWARE_ENA |
+	       ANA_CL_PORT_VLAN_CFG_POP_CNT(1) |
+	       MAC_VID,
+	       priv->regs[ANA_CL] + ANA_CL_PORT_VLAN_CFG(port));
+
+	/* Enable CPU port for any frame transfer */
+	setbits_le32(priv->regs[QFWD] + QFWD_SYSTEM_SWITCH_PORT_MODE(port),
+		     QFWD_SYSTEM_SWITCH_PORT_MODE_PORT_ENA);
+}
+
+static int ram_init(u32 val, void __iomem *addr)
+{
+	writel(val, addr);
+
+	if (wait_for_bit_le32(addr, BIT(1), false, 2000, false)) {
+		printf("Timeout in memory reset, reg = 0x%08x\n", val);
+		return 1;
+	}
+
+	return 0;
+}
+
+static int servalt_switch_init(struct servalt_private *priv)
+{
+	/* Initialize memories */
+	ram_init(0x3, priv->regs[QSYS] + QSYS_RAM_CTRL_RAM_INIT);
+	ram_init(0x3, priv->regs[ASM] + ASM_RAM_CTRL_RAM_INIT);
+	ram_init(0x3, priv->regs[ANA_AC] + ANA_AC_RAM_CTRL_RAM_INIT);
+	ram_init(0x3, priv->regs[REW] + REW_RAM_CTRL_RAM_INIT);
+
+	/* Reset counters */
+	writel(0x1, priv->regs[ANA_AC] + ANA_AC_STAT_GLOBAL_CFG_PORT_RESET);
+	writel(0x1, priv->regs[ASM] + ASM_CFG_STAT_CFG);
+
+	/* Enable switch-core and queue system */
+	writel(0x1, priv->regs[QSYS] + QSYS_SYSTEM_RESET_CFG);
+
+	return 0;
+}
+
+static void servalt_switch_config(struct servalt_private *priv)
+{
+	writel(0x55555555, priv->regs[QSYS] + QSYS_CALCFG_CAL_AUTO);
+
+	writel(readl(priv->regs[QSYS] + QSYS_CALCFG_CAL_CTRL) |
+	       QSYS_CALCFG_CAL_CTRL_CAL_MODE(8),
+	       priv->regs[QSYS] + QSYS_CALCFG_CAL_CTRL);
+}
+
+static int servalt_initialize(struct servalt_private *priv)
+{
+	int ret, i;
+
+	/* Initialize switch memories, enable core */
+	ret = servalt_switch_init(priv);
+	if (ret)
+		return ret;
+
+	servalt_switch_config(priv);
+
+	for (i = 0; i < MAX_PORT; i++)
+		servalt_port_init(priv, i);
+
+	servalt_cpu_capture_setup(priv);
+
+	return 0;
+}
+
+static inline
+int servalt_vlant_wait_for_completion(struct servalt_private *priv)
+{
+	if (wait_for_bit_le32(priv->regs[LRN] + LRN_COMMON_ACCESS_CTRL,
+			      LRN_COMMON_ACCESS_CTRL_MAC_TABLE_ACCESS_SHOT,
+			      false, 2000, false))
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int servalt_mac_table_add(struct servalt_private *priv,
+				 const unsigned char mac[ETH_ALEN], int pgid)
+{
+	u32 macl = 0, mach = 0;
+
+	/*
+	 * Set the MAC address to handle and the vlan associated in a format
+	 * understood by the hardware.
+	 */
+	mach |= MAC_VID << 16;
+	mach |= ((u32)mac[0]) << 8;
+	mach |= ((u32)mac[1]) << 0;
+	macl |= ((u32)mac[2]) << 24;
+	macl |= ((u32)mac[3]) << 16;
+	macl |= ((u32)mac[4]) << 8;
+	macl |= ((u32)mac[5]) << 0;
+
+	writel(mach, priv->regs[LRN] + LRN_COMMON_MAC_ACCESS_CFG0);
+	writel(macl, priv->regs[LRN] + LRN_COMMON_MAC_ACCESS_CFG1);
+
+	writel(LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_ADDR(pgid) |
+	       LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_TYPE(0x3) |
+	       LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_COPY |
+	       LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_CPU_QU(0) |
+	       LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_VLD |
+	       LRN_COMMON_MAC_ACCESS_CFG2_MAC_ENTRY_LOCKED,
+	       priv->regs[LRN] + LRN_COMMON_MAC_ACCESS_CFG2);
+
+	writel(LRN_COMMON_ACCESS_CTRL_MAC_TABLE_ACCESS_SHOT,
+	       priv->regs[LRN] + LRN_COMMON_ACCESS_CTRL);
+
+	return servalt_vlant_wait_for_completion(priv);
+}
+
+static int servalt_write_hwaddr(struct udevice *dev)
+{
+	struct servalt_private *priv = dev_get_priv(dev);
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+
+	return servalt_mac_table_add(priv, pdata->enetaddr, PGID_UNICAST);
+}
+
+static int servalt_start(struct udevice *dev)
+{
+	struct servalt_private *priv = dev_get_priv(dev);
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+	const unsigned char mac[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff };
+	int ret;
+
+	ret = servalt_initialize(priv);
+	if (ret)
+		return ret;
+
+	/* Set MAC address tables entries for CPU redirection */
+	ret = servalt_mac_table_add(priv, mac, PGID_BROADCAST);
+	if (ret)
+		return ret;
+
+	ret = servalt_mac_table_add(priv, pdata->enetaddr, PGID_UNICAST);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void servalt_stop(struct udevice *dev)
+{
+}
+
+static int servalt_send(struct udevice *dev, void *packet, int length)
+{
+	struct servalt_private *priv = dev_get_priv(dev);
+	u32 ifh[IFH_LEN];
+	u32 *buf = packet;
+
+	memset(ifh, '\0', IFH_LEN * 4);
+
+	/* Set DST PORT_MASK */
+	ifh[0] = htonl(0);
+	ifh[1] = htonl(0x1FFFFF);
+	ifh[2] = htonl(~0);
+	/* Set DST_MODE to INJECT and UPDATE_FCS */
+	ifh[5] = htonl(0x4c0);
+
+	return mscc_send(priv->regs[QS], servalt_regs_qs,
+			 ifh, IFH_LEN, buf, length);
+}
+
+static int servalt_recv(struct udevice *dev, int flags, uchar **packetp)
+{
+	struct servalt_private *priv = dev_get_priv(dev);
+	u32 *rxbuf = (u32 *)net_rx_packets[0];
+	int byte_cnt = 0;
+
+	byte_cnt = mscc_recv(priv->regs[QS], servalt_regs_qs, rxbuf, IFH_LEN,
+			     false);
+
+	*packetp = net_rx_packets[0];
+
+	return byte_cnt;
+}
+
+static struct mii_dev *get_mdiobus(phys_addr_t base, unsigned long size)
+{
+	int i = 0;
+
+	for (i = 0; i < SERVALT_MIIM_BUS_COUNT; ++i)
+		if (miim[i].miim_base == base && miim[i].miim_size == size)
+			return miim[i].bus;
+
+	return NULL;
+}
+
+static void add_port_entry(struct servalt_private *priv, size_t index,
+			   size_t phy_addr, struct mii_dev *bus)
+{
+	priv->ports[index].phy_addr = phy_addr;
+	priv->ports[index].bus = bus;
+}
+
+static int servalt_probe(struct udevice *dev)
+{
+	struct servalt_private *priv = dev_get_priv(dev);
+	int i;
+	struct resource res;
+	fdt32_t faddr;
+	phys_addr_t addr_base;
+	unsigned long addr_size;
+	ofnode eth_node, node, mdio_node;
+	size_t phy_addr;
+	struct mii_dev *bus;
+	struct ofnode_phandle_args phandle;
+
+	if (!priv)
+		return -EINVAL;
+
+	/* Get registers and map them to the private structure */
+	for (i = 0; i < ARRAY_SIZE(regs_names); i++) {
+		priv->regs[i] = dev_remap_addr_name(dev, regs_names[i]);
+		if (!priv->regs[i]) {
+			debug
+			    ("Error can't get regs base addresses for %s\n",
+			     regs_names[i]);
+			return -ENOMEM;
+		}
+	}
+
+	/* Initialize miim buses */
+	memset(&miim, 0x0, sizeof(struct mscc_miim_dev) *
+	       SERVALT_MIIM_BUS_COUNT);
+
+	/* iterate all the ports and find out on which bus they are */
+	i = 0;
+	eth_node = dev_read_first_subnode(dev);
+	for (node = ofnode_first_subnode(eth_node);
+	     ofnode_valid(node);
+	     node = ofnode_next_subnode(node)) {
+		if (ofnode_read_resource(node, 0, &res))
+			return -ENOMEM;
+		i = res.start;
+
+		ofnode_parse_phandle_with_args(node, "phy-handle", NULL, 0, 0,
+					       &phandle);
+
+		/* Get phy address on mdio bus */
+		if (ofnode_read_resource(phandle.node, 0, &res))
+			return -ENOMEM;
+		phy_addr = res.start;
+
+		/* Get mdio node */
+		mdio_node = ofnode_get_parent(phandle.node);
+
+		if (ofnode_read_resource(mdio_node, 0, &res))
+			return -ENOMEM;
+		faddr = cpu_to_fdt32(res.start);
+
+		addr_base = ofnode_translate_address(mdio_node, &faddr);
+		addr_size = res.end - res.start;
+
+		/* If the bus is new then create a new bus */
+		if (!get_mdiobus(addr_base, addr_size))
+			priv->bus[miim_count] =
+				servalt_mdiobus_init(addr_base, addr_size);
+
+		/* Connect mdio bus with the port */
+		bus = get_mdiobus(addr_base, addr_size);
+		add_port_entry(priv, i, phy_addr, bus);
+	}
+
+	mscc_phy_reset();
+
+	for (i = 0; i < MAX_PORT; i++) {
+		if (!priv->ports[i].bus)
+			continue;
+
+		phy_connect(priv->ports[i].bus, priv->ports[i].phy_addr, dev,
+			    PHY_INTERFACE_MODE_NONE);
+	}
+
+	return 0;
+}
+
+static int servalt_remove(struct udevice *dev)
+{
+	struct servalt_private *priv = dev_get_priv(dev);
+	int i;
+
+	for (i = 0; i < SERVALT_MIIM_BUS_COUNT; i++) {
+		mdio_unregister(priv->bus[i]);
+		mdio_free(priv->bus[i]);
+	}
+
+	return 0;
+}
+
+static const struct eth_ops servalt_ops = {
+	.start        = servalt_start,
+	.stop         = servalt_stop,
+	.send         = servalt_send,
+	.recv         = servalt_recv,
+	.write_hwaddr = servalt_write_hwaddr,
+};
+
+static const struct udevice_id mscc_servalt_ids[] = {
+	{.compatible = "mscc,vsc7437-switch" },
+	{ /* Sentinel */ }
+};
+
+U_BOOT_DRIVER(servalt) = {
+	.name				= "servalt-switch",
+	.id				= UCLASS_ETH,
+	.of_match			= mscc_servalt_ids,
+	.probe				= servalt_probe,
+	.remove				= servalt_remove,
+	.ops				= &servalt_ops,
+	.priv_auto_alloc_size		= sizeof(struct servalt_private),
+	.platdata_auto_alloc_size	= sizeof(struct eth_pdata),
+};