u-boot/drivers/net/mscc_eswitch/ocelot_switch.c

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (c) 2018 Microsemi Corporation
 */

#include <common.h>
#include <config.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <dm/of_access.h>
#include <dm/of_addr.h>
#include <fdt_support.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <miiphy.h>
#include <net.h>
#include <wait_bit.h>
#include <linux/printk.h>

#include "mscc_xfer.h"
#include "mscc_mac_table.h"
#include "mscc_miim.h"

#define PHY_CFG				0x0
#define PHY_CFG_ENA				0xF
#define PHY_CFG_COMMON_RST			BIT(4)
#define PHY_CFG_RST				(0xF << 5)
#define PHY_STAT			0x4
#define PHY_STAT_SUPERVISOR_COMPLETE		BIT(0)

#define ANA_PORT_VLAN_CFG(x)		(0x7000 + 0x100 * (x))
#define		ANA_PORT_VLAN_CFG_AWARE_ENA	BIT(20)
#define		ANA_PORT_VLAN_CFG_POP_CNT(x)	((x) << 18)
#define ANA_PORT_PORT_CFG(x)		(0x7070 + 0x100 * (x))
#define		ANA_PORT_PORT_CFG_RECV_ENA	BIT(6)
#define ANA_PGID(x)			(0x8c00 + 4 * (x))

#define HSIO_ANA_SERDES1G_DES_CFG		0x4c
#define		HSIO_ANA_SERDES1G_DES_CFG_BW_HYST(x)		((x) << 1)
#define		HSIO_ANA_SERDES1G_DES_CFG_BW_ANA(x)		((x) << 5)
#define		HSIO_ANA_SERDES1G_DES_CFG_MBTR_CTRL(x)		((x) << 8)
#define		HSIO_ANA_SERDES1G_DES_CFG_PHS_CTRL(x)		((x) << 13)
#define HSIO_ANA_SERDES1G_IB_CFG		0x50
#define		HSIO_ANA_SERDES1G_IB_CFG_RESISTOR_CTRL(x)	(x)
#define		HSIO_ANA_SERDES1G_IB_CFG_EQ_GAIN(x)		((x) << 6)
#define		HSIO_ANA_SERDES1G_IB_CFG_ENA_OFFSET_COMP	BIT(9)
#define		HSIO_ANA_SERDES1G_IB_CFG_ENA_DETLEV		BIT(11)
#define		HSIO_ANA_SERDES1G_IB_CFG_ENA_CMV_TERM		BIT(13)
#define		HSIO_ANA_SERDES1G_IB_CFG_ACJTAG_HYST(x)		((x) << 24)
#define HSIO_ANA_SERDES1G_OB_CFG		0x54
#define		HSIO_ANA_SERDES1G_OB_CFG_RESISTOR_CTRL(x)	(x)
#define		HSIO_ANA_SERDES1G_OB_CFG_VCM_CTRL(x)		((x) << 4)
#define		HSIO_ANA_SERDES1G_OB_CFG_CMM_BIAS_CTRL(x)	((x) << 10)
#define		HSIO_ANA_SERDES1G_OB_CFG_AMP_CTRL(x)		((x) << 13)
#define		HSIO_ANA_SERDES1G_OB_CFG_SLP(x)			((x) << 17)
#define HSIO_ANA_SERDES1G_SER_CFG		0x58
#define HSIO_ANA_SERDES1G_COMMON_CFG		0x5c
#define		HSIO_ANA_SERDES1G_COMMON_CFG_IF_MODE		BIT(0)
#define		HSIO_ANA_SERDES1G_COMMON_CFG_ENA_LANE		BIT(18)
#define		HSIO_ANA_SERDES1G_COMMON_CFG_SYS_RST		BIT(31)
#define HSIO_ANA_SERDES1G_PLL_CFG		0x60
#define		HSIO_ANA_SERDES1G_PLL_CFG_FSM_ENA		BIT(7)
#define		HSIO_ANA_SERDES1G_PLL_CFG_FSM_CTRL_DATA(x)	((x) << 8)
#define		HSIO_ANA_SERDES1G_PLL_CFG_ENA_RC_DIV2		BIT(21)
#define HSIO_DIG_SERDES1G_DFT_CFG0		0x68
#define HSIO_DIG_SERDES1G_MISC_CFG		0x7c
#define		HSIO_DIG_SERDES1G_MISC_CFG_LANE_RST		BIT(0)
#define HSIO_MCB_SERDES1G_CFG			0x88
#define		HSIO_MCB_SERDES1G_CFG_WR_ONE_SHOT		BIT(31)
#define		HSIO_MCB_SERDES1G_CFG_ADDR(x)			(x)
#define HSIO_HW_CFGSTAT_HW_CFG			0x10c

#define SYS_FRM_AGING			0x574
#define		SYS_FRM_AGING_ENA		BIT(20)

#define SYS_SYSTEM_RST_CFG		0x508
#define		SYS_SYSTEM_RST_MEM_INIT		BIT(0)
#define		SYS_SYSTEM_RST_MEM_ENA		BIT(1)
#define		SYS_SYSTEM_RST_CORE_ENA		BIT(2)
#define SYS_PORT_MODE(x)		(0x514 + 0x4 * (x))
#define		SYS_PORT_MODE_INCL_INJ_HDR(x)	((x) << 3)
#define		SYS_PORT_MODE_INCL_INJ_HDR_M	GENMASK(4, 3)
#define		SYS_PORT_MODE_INCL_XTR_HDR(x)	((x) << 1)
#define		SYS_PORT_MODE_INCL_XTR_HDR_M	GENMASK(2, 1)
#define	SYS_PAUSE_CFG(x)		(0x608 + 0x4 * (x))
#define		SYS_PAUSE_CFG_PAUSE_ENA		BIT(0)

#define QSYS_SWITCH_PORT_MODE(x)	(0x11234 + 0x4 * (x))
#define		QSYS_SWITCH_PORT_MODE_PORT_ENA	BIT(14)
#define	QSYS_QMAP			0x112d8
#define	QSYS_EGR_NO_SHARING		0x1129c

/* Port registers */
#define DEV_CLOCK_CFG			0x0
#define DEV_CLOCK_CFG_LINK_SPEED_1000		1
#define DEV_MAC_ENA_CFG			0x1c
#define		DEV_MAC_ENA_CFG_RX_ENA		BIT(4)
#define		DEV_MAC_ENA_CFG_TX_ENA		BIT(0)

#define DEV_MAC_IFG_CFG			0x30
#define		DEV_MAC_IFG_CFG_TX_IFG(x)	((x) << 8)
#define		DEV_MAC_IFG_CFG_RX_IFG2(x)	((x) << 4)
#define		DEV_MAC_IFG_CFG_RX_IFG1(x)	(x)

#define PCS1G_CFG			0x48
#define		PCS1G_MODE_CFG_SGMII_MODE_ENA	BIT(0)
#define PCS1G_MODE_CFG			0x4c
#define		PCS1G_MODE_CFG_UNIDIR_MODE_ENA	BIT(4)
#define		PCS1G_MODE_CFG_SGMII_MODE_ENA	BIT(0)
#define PCS1G_SD_CFG			0x50
#define PCS1G_ANEG_CFG			0x54
#define		PCS1G_ANEG_CFG_ADV_ABILITY(x)	((x) << 16)

#define QS_XTR_GRP_CFG(x)		(4 * (x))
#define QS_XTR_GRP_CFG_MODE(x)			((x) << 2)
#define		QS_XTR_GRP_CFG_STATUS_WORD_POS	BIT(1)
#define		QS_XTR_GRP_CFG_BYTE_SWAP	BIT(0)
#define QS_INJ_GRP_CFG(x)		(0x24 + (x) * 4)
#define		QS_INJ_GRP_CFG_MODE(x)		((x) << 2)
#define		QS_INJ_GRP_CFG_BYTE_SWAP	BIT(0)

#define IFH_INJ_BYPASS		BIT(31)
#define IFH_TAG_TYPE_C		0
#define MAC_VID			1
#define CPU_PORT		11
#define INTERNAL_PORT_MSK	0x2FF
#define IFH_LEN			4
#define ETH_ALEN		6
#define PGID_BROADCAST		13
#define PGID_UNICAST		14
#define PGID_SRC		80

static const char * const regs_names[] = {
	"port0", "port1", "port2", "port3", "port4", "port5", "port6", "port7",
	"port8", "port9", "port10", "sys", "rew", "qs", "hsio", "qsys", "ana",
};

#define REGS_NAMES_COUNT ARRAY_SIZE(regs_names) + 1
#define MAX_PORT 11

enum ocelot_ctrl_regs {
	SYS = MAX_PORT,
	REW,
	QS,
	HSIO,
	QSYS,
	ANA,
};

#define OCELOT_MIIM_BUS_COUNT 2

struct ocelot_phy_port_t {
	size_t phy_addr;
	struct mii_dev *bus;
	u8 serdes_index;
	u8 phy_mode;
};

struct ocelot_private {
	void __iomem *regs[REGS_NAMES_COUNT];
	struct mii_dev *bus[OCELOT_MIIM_BUS_COUNT];
	struct ocelot_phy_port_t ports[MAX_PORT];
};

static struct mscc_miim_dev miim[OCELOT_MIIM_BUS_COUNT];
static int miim_count = -1;

static const unsigned long ocelot_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 const unsigned long ocelot_regs_ana_table[] = {
	[MSCC_ANA_TABLES_MACHDATA] = 0x8b34,
	[MSCC_ANA_TABLES_MACLDATA] = 0x8b38,
	[MSCC_ANA_TABLES_MACACCESS] = 0x8b3c,
};

static void mscc_phy_reset(void)
{
	writel(0, BASE_DEVCPU_GCB + PERF_PHY_CFG + PHY_CFG);
	writel(PHY_CFG_RST | PHY_CFG_COMMON_RST
	       | PHY_CFG_ENA, BASE_DEVCPU_GCB + PERF_PHY_CFG + PHY_CFG);
	if (wait_for_bit_le32((const void *)(BASE_DEVCPU_GCB + PERF_PHY_CFG) +
			      PHY_STAT, PHY_STAT_SUPERVISOR_COMPLETE,
			      true, 2000, false)) {
		pr_err("Timeout in phy reset\n");
	}
}

__weak void mscc_switch_reset(void)
{
}

static void ocelot_stop(struct udevice *dev)
{
	mscc_switch_reset();
	mscc_phy_reset();
}

static void ocelot_cpu_capture_setup(struct ocelot_private *priv)
{
	int i;

	/* map the 8 CPU extraction queues to CPU port 11 */
	writel(0, priv->regs[QSYS] + QSYS_QMAP);

	for (i = 0; i <= 1; i++) {
		/*
		 * Do byte-swap and expect status after last data word
		 * Extraction: Mode: manual extraction) | Byte_swap
		 */
		writel(QS_XTR_GRP_CFG_MODE(1) | QS_XTR_GRP_CFG_BYTE_SWAP,
		       priv->regs[QS] + QS_XTR_GRP_CFG(i));
		/*
		 * Injection: Mode: manual extraction | Byte_swap
		 */
		writel(QS_INJ_GRP_CFG_MODE(1) | QS_INJ_GRP_CFG_BYTE_SWAP,
		       priv->regs[QS] + QS_INJ_GRP_CFG(i));
	}

	for (i = 0; i <= 1; i++)
		/* Enable IFH insertion/parsing on CPU ports */
		writel(SYS_PORT_MODE_INCL_INJ_HDR(1) |
		       SYS_PORT_MODE_INCL_XTR_HDR(1),
		       priv->regs[SYS] + SYS_PORT_MODE(CPU_PORT + i));
	/*
	 * Setup the CPU port as VLAN aware to support switching frames
	 * based on tags
	 */
	writel(ANA_PORT_VLAN_CFG_AWARE_ENA | ANA_PORT_VLAN_CFG_POP_CNT(1) |
	       MAC_VID, priv->regs[ANA] + ANA_PORT_VLAN_CFG(CPU_PORT));

	/* Disable learning (only RECV_ENA must be set) */
	writel(ANA_PORT_PORT_CFG_RECV_ENA,
	       priv->regs[ANA] + ANA_PORT_PORT_CFG(CPU_PORT));

	/* Enable switching to/from cpu port */
	setbits_le32(priv->regs[QSYS] + QSYS_SWITCH_PORT_MODE(CPU_PORT),
		     QSYS_SWITCH_PORT_MODE_PORT_ENA);

	/* No pause on CPU port - not needed (off by default) */
	clrbits_le32(priv->regs[SYS] + SYS_PAUSE_CFG(CPU_PORT),
		     SYS_PAUSE_CFG_PAUSE_ENA);

	setbits_le32(priv->regs[QSYS] + QSYS_EGR_NO_SHARING, BIT(CPU_PORT));
}

static void ocelot_port_init(struct ocelot_private *priv, int port)
{
	void __iomem *regs = priv->regs[port];

	/* Enable PCS */
	writel(PCS1G_MODE_CFG_SGMII_MODE_ENA, regs + PCS1G_CFG);

	/* Disable Signal Detect */
	writel(0, regs + PCS1G_SD_CFG);

	/* Enable MAC RX and TX */
	writel(DEV_MAC_ENA_CFG_RX_ENA | DEV_MAC_ENA_CFG_TX_ENA,
	       regs + DEV_MAC_ENA_CFG);

	/* Clear sgmii_mode_ena */
	writel(0, regs + PCS1G_MODE_CFG);

	/*
	 * Clear sw_resolve_ena(bit 0) and set adv_ability to
	 * something meaningful just in case
	 */
	writel(PCS1G_ANEG_CFG_ADV_ABILITY(0x20), regs + PCS1G_ANEG_CFG);

	/* Set MAC IFG Gaps */
	writel(DEV_MAC_IFG_CFG_TX_IFG(5) | DEV_MAC_IFG_CFG_RX_IFG1(5) |
	       DEV_MAC_IFG_CFG_RX_IFG2(1), regs + DEV_MAC_IFG_CFG);

	/* Set link speed and release all resets */
	writel(DEV_CLOCK_CFG_LINK_SPEED_1000, regs + DEV_CLOCK_CFG);

	/* Make VLAN aware for CPU traffic */
	writel(ANA_PORT_VLAN_CFG_AWARE_ENA | ANA_PORT_VLAN_CFG_POP_CNT(1) |
	       MAC_VID, priv->regs[ANA] + ANA_PORT_VLAN_CFG(port));

	/* Enable the port in the core */
	setbits_le32(priv->regs[QSYS] + QSYS_SWITCH_PORT_MODE(port),
		     QSYS_SWITCH_PORT_MODE_PORT_ENA);
}

static void serdes1g_write(void __iomem *base, u32 addr)
{
	u32 data;

	writel(HSIO_MCB_SERDES1G_CFG_WR_ONE_SHOT |
	       HSIO_MCB_SERDES1G_CFG_ADDR(addr),
	       base + HSIO_MCB_SERDES1G_CFG);

	do {
		data = readl(base + HSIO_MCB_SERDES1G_CFG);
	} while (data & HSIO_MCB_SERDES1G_CFG_WR_ONE_SHOT);
}

static void serdes1g_setup(void __iomem *base, uint32_t addr,
			   phy_interface_t interface)
{
	writel(0x34, base + HSIO_HW_CFGSTAT_HW_CFG);

	writel(0x0, base + HSIO_ANA_SERDES1G_SER_CFG);
	writel(0x0, base + HSIO_DIG_SERDES1G_DFT_CFG0);
	writel(HSIO_ANA_SERDES1G_IB_CFG_RESISTOR_CTRL(11) |
	       HSIO_ANA_SERDES1G_IB_CFG_EQ_GAIN(0) |
	       HSIO_ANA_SERDES1G_IB_CFG_ENA_OFFSET_COMP |
	       HSIO_ANA_SERDES1G_IB_CFG_ENA_CMV_TERM |
	       HSIO_ANA_SERDES1G_IB_CFG_ACJTAG_HYST(1),
	       base + HSIO_ANA_SERDES1G_IB_CFG);
	writel(HSIO_ANA_SERDES1G_DES_CFG_BW_HYST(7) |
	       HSIO_ANA_SERDES1G_DES_CFG_BW_ANA(6) |
	       HSIO_ANA_SERDES1G_DES_CFG_MBTR_CTRL(2) |
	       HSIO_ANA_SERDES1G_DES_CFG_PHS_CTRL(6),
	       base + HSIO_ANA_SERDES1G_DES_CFG);
	writel(HSIO_ANA_SERDES1G_OB_CFG_RESISTOR_CTRL(1) |
	       HSIO_ANA_SERDES1G_OB_CFG_VCM_CTRL(4) |
	       HSIO_ANA_SERDES1G_OB_CFG_CMM_BIAS_CTRL(2) |
	       HSIO_ANA_SERDES1G_OB_CFG_AMP_CTRL(12) |
	       HSIO_ANA_SERDES1G_OB_CFG_SLP(3),
	       base + HSIO_ANA_SERDES1G_OB_CFG);
	writel(HSIO_ANA_SERDES1G_COMMON_CFG_IF_MODE |
	       HSIO_ANA_SERDES1G_COMMON_CFG_ENA_LANE,
	       base + HSIO_ANA_SERDES1G_COMMON_CFG);
	writel(HSIO_ANA_SERDES1G_PLL_CFG_FSM_ENA |
	       HSIO_ANA_SERDES1G_PLL_CFG_FSM_CTRL_DATA(200) |
	       HSIO_ANA_SERDES1G_PLL_CFG_ENA_RC_DIV2,
	       base + HSIO_ANA_SERDES1G_PLL_CFG);
	writel(HSIO_DIG_SERDES1G_MISC_CFG_LANE_RST,
	       base + HSIO_DIG_SERDES1G_MISC_CFG);

	serdes1g_write(base, addr);

	writel(HSIO_ANA_SERDES1G_COMMON_CFG_IF_MODE |
	       HSIO_ANA_SERDES1G_COMMON_CFG_ENA_LANE |
	       HSIO_ANA_SERDES1G_COMMON_CFG_SYS_RST,
	       base + HSIO_ANA_SERDES1G_COMMON_CFG);
	serdes1g_write(base, addr);

	writel(0x0, base + HSIO_DIG_SERDES1G_MISC_CFG);
	serdes1g_write(base, addr);
}

static void serdes_setup(struct ocelot_private *priv)
{
	size_t mask;
	int i = 0;

	for (i = 0; i < MAX_PORT; ++i) {
		if (!priv->ports[i].bus || priv->ports[i].serdes_index == 0xff)
			continue;

		mask = BIT(priv->ports[i].serdes_index);
		serdes1g_setup(priv->regs[HSIO], mask,
			       priv->ports[i].phy_mode);
	}
}

static int ocelot_switch_init(struct ocelot_private *priv)
{
	/* Reset switch & memories */
	writel(SYS_SYSTEM_RST_MEM_ENA | SYS_SYSTEM_RST_MEM_INIT,
	       priv->regs[SYS] + SYS_SYSTEM_RST_CFG);

	/* Wait to complete */
	if (wait_for_bit_le32(priv->regs[SYS] + SYS_SYSTEM_RST_CFG,
			      SYS_SYSTEM_RST_MEM_INIT, false, 2000, false)) {
		pr_err("Timeout in memory reset\n");
		return -EIO;
	}

	/* Enable switch core */
	setbits_le32(priv->regs[SYS] + SYS_SYSTEM_RST_CFG,
		     SYS_SYSTEM_RST_CORE_ENA);

	serdes_setup(priv);
	return 0;
}

static int ocelot_initialize(struct ocelot_private *priv)
{
	int ret, i;

	/* Initialize switch memories, enable core */
	ret = ocelot_switch_init(priv);
	if (ret)
		return ret;
	/*
	 * Disable port-to-port by switching
	 * Put fron ports in "port isolation modes" - i.e. they cant send
	 * to other ports - via the PGID sorce masks.
	 */
	for (i = 0; i < MAX_PORT; i++)
		writel(0, priv->regs[ANA] + ANA_PGID(PGID_SRC + i));

	/* Flush queues */
	mscc_flush(priv->regs[QS], ocelot_regs_qs);

	/* Setup frame ageing - "2 sec" - The unit is 6.5us on Ocelot */
	writel(SYS_FRM_AGING_ENA | (20000000 / 65),
	       priv->regs[SYS] + SYS_FRM_AGING);

	for (i = 0; i < MAX_PORT; i++)
		ocelot_port_init(priv, i);

	ocelot_cpu_capture_setup(priv);

	debug("Ports enabled\n");

	return 0;
}

static int ocelot_write_hwaddr(struct udevice *dev)
{
	struct ocelot_private *priv = dev_get_priv(dev);
	struct eth_pdata *pdata = dev_get_plat(dev);

	mscc_mac_table_add(priv->regs[ANA], ocelot_regs_ana_table,
			   pdata->enetaddr, PGID_UNICAST);

	writel(BIT(CPU_PORT), priv->regs[ANA] + ANA_PGID(PGID_UNICAST));

	return 0;
}

static int ocelot_start(struct udevice *dev)
{
	struct ocelot_private *priv = dev_get_priv(dev);
	struct eth_pdata *pdata = dev_get_plat(dev);
	const unsigned char mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff,
					      0xff };
	int ret;

	ret = ocelot_initialize(priv);
	if (ret)
		return ret;

	/* Set MAC address tables entries for CPU redirection */
	mscc_mac_table_add(priv->regs[ANA], ocelot_regs_ana_table, mac,
			   PGID_BROADCAST);

	writel(BIT(CPU_PORT) | INTERNAL_PORT_MSK,
	       priv->regs[ANA] + ANA_PGID(PGID_BROADCAST));

	/* It should be setup latter in ocelot_write_hwaddr */
	mscc_mac_table_add(priv->regs[ANA], ocelot_regs_ana_table,
			   pdata->enetaddr, PGID_UNICAST);

	writel(BIT(CPU_PORT), priv->regs[ANA] + ANA_PGID(PGID_UNICAST));

	return 0;
}

static int ocelot_send(struct udevice *dev, void *packet, int length)
{
	struct ocelot_private *priv = dev_get_priv(dev);
	u32 ifh[IFH_LEN];
	int port = BIT(0);	/* use port 0 */
	u32 *buf = packet;

	/*
	 * Generate the IFH for frame injection
	 *
	 * The IFH is a 128bit-value
	 * bit 127: bypass the analyzer processing
	 * bit 56-67: destination mask
	 * bit 28-29: pop_cnt: 3 disables all rewriting of the frame
	 * bit 20-27: cpu extraction queue mask
	 * bit 16: tag type 0: C-tag, 1: S-tag
	 * bit 0-11: VID
	 */
	ifh[0] = IFH_INJ_BYPASS;
	ifh[1] = (0xf00 & port) >> 8;
	ifh[2] = (0xff & port) << 24;
	ifh[3] = (IFH_TAG_TYPE_C << 16);

	return mscc_send(priv->regs[QS], ocelot_regs_qs,
			 ifh, IFH_LEN, buf, length);
}

static int ocelot_recv(struct udevice *dev, int flags, uchar **packetp)
{
	struct ocelot_private *priv = dev_get_priv(dev);
	u32 *rxbuf = (u32 *)net_rx_packets[0];
	int byte_cnt;

	byte_cnt = mscc_recv(priv->regs[QS], ocelot_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 < OCELOT_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 ocelot_private *priv, size_t index,
			   size_t phy_addr, struct mii_dev *bus,
			   u8 serdes_index, u8 phy_mode)
{
	priv->ports[index].phy_addr = phy_addr;
	priv->ports[index].bus = bus;
	priv->ports[index].serdes_index = serdes_index;
	priv->ports[index].phy_mode = phy_mode;
}

static int external_bus(struct ocelot_private *priv, size_t port_index)
{
	return priv->ports[port_index].serdes_index != 0xff;
}

static int ocelot_probe(struct udevice *dev)
{
	struct ocelot_private *priv = dev_get_priv(dev);
	int i, ret;
	struct resource res;
	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;
	struct phy_device *phy;

	if (!priv)
		return -EINVAL;

	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) *
	       OCELOT_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;

		addr_base = res.start;
		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] =
				mscc_mdiobus_init(miim, &miim_count, addr_base,
						  addr_size);

		/* Connect mdio bus with the port */
		bus = get_mdiobus(addr_base, addr_size);

		/* Get serdes info */
		ret = ofnode_parse_phandle_with_args(node, "phys", NULL,
						     3, 0, &phandle);
		if (ret)
			add_port_entry(priv, i, phy_addr, bus, 0xff, 0xff);
		else
			add_port_entry(priv, i, phy_addr, bus, phandle.args[1],
				       phandle.args[2]);
	}

	mscc_phy_reset();

	for (i = 0; i < MAX_PORT; i++) {
		if (!priv->ports[i].bus)
			continue;

		phy = phy_connect(priv->ports[i].bus,
				  priv->ports[i].phy_addr, dev,
				  PHY_INTERFACE_MODE_NA);
		if (phy && external_bus(priv, i))
			board_phy_config(phy);
	}

	return 0;
}

static int ocelot_remove(struct udevice *dev)
{
	struct ocelot_private *priv = dev_get_priv(dev);
	int i;

	for (i = 0; i < OCELOT_MIIM_BUS_COUNT; i++) {
		mdio_unregister(priv->bus[i]);
		mdio_free(priv->bus[i]);
	}

	return 0;
}

static const struct eth_ops ocelot_ops = {
	.start        = ocelot_start,
	.stop         = ocelot_stop,
	.send         = ocelot_send,
	.recv         = ocelot_recv,
	.write_hwaddr = ocelot_write_hwaddr,
};

static const struct udevice_id mscc_ocelot_ids[] = {
	{.compatible = "mscc,vsc7514-switch"},
	{ /* Sentinel */ }
};

U_BOOT_DRIVER(ocelot) = {
	.name     = "ocelot-switch",
	.id       = UCLASS_ETH,
	.of_match = mscc_ocelot_ids,
	.probe	  = ocelot_probe,
	.remove	  = ocelot_remove,
	.ops	  = &ocelot_ops,
	.priv_auto	= sizeof(struct ocelot_private),
	.plat_auto	= sizeof(struct eth_pdata),
};