mtk_eth.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018 MediaTek Inc.
 *
 * Author: Weijie Gao <weijie.gao@mediatek.com>
 * Author: Mark Lee <mark-mc.lee@mediatek.com>
 */

#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <miiphy.h>
#include <regmap.h>
#include <reset.h>
#include <syscon.h>
#include <wait_bit.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <linux/err.h>
#include <linux/ioport.h>
#include <linux/mdio.h>
#include <linux/mii.h>

#include "mtk_eth.h"

#define NUM_TX_DESC		24
#define NUM_RX_DESC		24
#define TX_TOTAL_BUF_SIZE	(NUM_TX_DESC * PKTSIZE_ALIGN)
#define RX_TOTAL_BUF_SIZE	(NUM_RX_DESC * PKTSIZE_ALIGN)
#define TOTAL_PKT_BUF_SIZE	(TX_TOTAL_BUF_SIZE + RX_TOTAL_BUF_SIZE)

#define MT7530_NUM_PHYS		5
#define MT7530_DFL_SMI_ADDR	31

#define MT7530_PHY_ADDR(base, addr) \
	(((base) + (addr)) & 0x1f)

#define GDMA_FWD_TO_CPU \
	(0x20000000 | \
	GDM_ICS_EN | \
	GDM_TCS_EN | \
	GDM_UCS_EN | \
	STRP_CRC | \
	(DP_PDMA << MYMAC_DP_S) | \
	(DP_PDMA << BC_DP_S) | \
	(DP_PDMA << MC_DP_S) | \
	(DP_PDMA << UN_DP_S))

#define GDMA_FWD_DISCARD \
	(0x20000000 | \
	GDM_ICS_EN | \
	GDM_TCS_EN | \
	GDM_UCS_EN | \
	STRP_CRC | \
	(DP_DISCARD << MYMAC_DP_S) | \
	(DP_DISCARD << BC_DP_S) | \
	(DP_DISCARD << MC_DP_S) | \
	(DP_DISCARD << UN_DP_S))

struct pdma_rxd_info1 {
	u32 PDP0;
};

struct pdma_rxd_info2 {
	u32 PLEN1 : 14;
	u32 LS1 : 1;
	u32 UN_USED : 1;
	u32 PLEN0 : 14;
	u32 LS0 : 1;
	u32 DDONE : 1;
};

struct pdma_rxd_info3 {
	u32 PDP1;
};

struct pdma_rxd_info4 {
	u32 FOE_ENTRY : 14;
	u32 CRSN : 5;
	u32 SP : 3;
	u32 L4F : 1;
	u32 L4VLD : 1;
	u32 TACK : 1;
	u32 IP4F : 1;
	u32 IP4 : 1;
	u32 IP6 : 1;
	u32 UN_USED : 4;
};

struct pdma_rxdesc {
	struct pdma_rxd_info1 rxd_info1;
	struct pdma_rxd_info2 rxd_info2;
	struct pdma_rxd_info3 rxd_info3;
	struct pdma_rxd_info4 rxd_info4;
};

struct pdma_txd_info1 {
	u32 SDP0;
};

struct pdma_txd_info2 {
	u32 SDL1 : 14;
	u32 LS1 : 1;
	u32 BURST : 1;
	u32 SDL0 : 14;
	u32 LS0 : 1;
	u32 DDONE : 1;
};

struct pdma_txd_info3 {
	u32 SDP1;
};

struct pdma_txd_info4 {
	u32 VLAN_TAG : 16;
	u32 INS : 1;
	u32 RESV : 2;
	u32 UDF : 6;
	u32 FPORT : 3;
	u32 TSO : 1;
	u32 TUI_CO : 3;
};

struct pdma_txdesc {
	struct pdma_txd_info1 txd_info1;
	struct pdma_txd_info2 txd_info2;
	struct pdma_txd_info3 txd_info3;
	struct pdma_txd_info4 txd_info4;
};

enum mtk_switch {
	SW_NONE,
	SW_MT7530
};

enum mtk_soc {
	SOC_MT7623,
	SOC_MT7629
};

struct mtk_eth_priv {
	char pkt_pool[TOTAL_PKT_BUF_SIZE] __aligned(ARCH_DMA_MINALIGN);

	struct pdma_txdesc *tx_ring_noc;
	struct pdma_rxdesc *rx_ring_noc;

	int rx_dma_owner_idx0;
	int tx_cpu_owner_idx0;

	void __iomem *fe_base;
	void __iomem *gmac_base;
	void __iomem *ethsys_base;

	struct mii_dev *mdio_bus;
	int (*mii_read)(struct mtk_eth_priv *priv, u8 phy, u8 reg);
	int (*mii_write)(struct mtk_eth_priv *priv, u8 phy, u8 reg, u16 val);
	int (*mmd_read)(struct mtk_eth_priv *priv, u8 addr, u8 devad, u16 reg);
	int (*mmd_write)(struct mtk_eth_priv *priv, u8 addr, u8 devad, u16 reg,
			 u16 val);

	enum mtk_soc soc;
	int gmac_id;
	int force_mode;
	int speed;
	int duplex;

	struct phy_device *phydev;
	int phy_interface;
	int phy_addr;

	enum mtk_switch sw;
	int (*switch_init)(struct mtk_eth_priv *priv);
	u32 mt7530_smi_addr;
	u32 mt7530_phy_base;

	struct gpio_desc rst_gpio;
	int mcm;

	struct reset_ctl rst_fe;
	struct reset_ctl rst_mcm;
};

static void mtk_pdma_write(struct mtk_eth_priv *priv, u32 reg, u32 val)
{
	writel(val, priv->fe_base + PDMA_BASE + reg);
}

static void mtk_pdma_rmw(struct mtk_eth_priv *priv, u32 reg, u32 clr,
			 u32 set)
{
	clrsetbits_le32(priv->fe_base + PDMA_BASE + reg, clr, set);
}

static void mtk_gdma_write(struct mtk_eth_priv *priv, int no, u32 reg,
			   u32 val)
{
	u32 gdma_base;

	if (no == 1)
		gdma_base = GDMA2_BASE;
	else
		gdma_base = GDMA1_BASE;

	writel(val, priv->fe_base + gdma_base + reg);
}

static u32 mtk_gmac_read(struct mtk_eth_priv *priv, u32 reg)
{
	return readl(priv->gmac_base + reg);
}

static void mtk_gmac_write(struct mtk_eth_priv *priv, u32 reg, u32 val)
{
	writel(val, priv->gmac_base + reg);
}

static void mtk_gmac_rmw(struct mtk_eth_priv *priv, u32 reg, u32 clr, u32 set)
{
	clrsetbits_le32(priv->gmac_base + reg, clr, set);
}

static void mtk_ethsys_rmw(struct mtk_eth_priv *priv, u32 reg, u32 clr,
			   u32 set)
{
	clrsetbits_le32(priv->ethsys_base + reg, clr, set);
}

/* Direct MDIO clause 22/45 access via SoC */
static int mtk_mii_rw(struct mtk_eth_priv *priv, u8 phy, u8 reg, u16 data,
		      u32 cmd, u32 st)
{
	int ret;
	u32 val;

	val = (st << MDIO_ST_S) |
	      ((cmd << MDIO_CMD_S) & MDIO_CMD_M) |
	      (((u32)phy << MDIO_PHY_ADDR_S) & MDIO_PHY_ADDR_M) |
	      (((u32)reg << MDIO_REG_ADDR_S) & MDIO_REG_ADDR_M);

	if (cmd == MDIO_CMD_WRITE)
		val |= data & MDIO_RW_DATA_M;

	mtk_gmac_write(priv, GMAC_PIAC_REG, val | PHY_ACS_ST);

	ret = wait_for_bit_le32(priv->gmac_base + GMAC_PIAC_REG,
				PHY_ACS_ST, 0, 5000, 0);
	if (ret) {
		pr_warn("MDIO access timeout\n");
		return ret;
	}

	if (cmd == MDIO_CMD_READ) {
		val = mtk_gmac_read(priv, GMAC_PIAC_REG);
		return val & MDIO_RW_DATA_M;
	}

	return 0;
}

/* Direct MDIO clause 22 read via SoC */
static int mtk_mii_read(struct mtk_eth_priv *priv, u8 phy, u8 reg)
{
	return mtk_mii_rw(priv, phy, reg, 0, MDIO_CMD_READ, MDIO_ST_C22);
}

/* Direct MDIO clause 22 write via SoC */
static int mtk_mii_write(struct mtk_eth_priv *priv, u8 phy, u8 reg, u16 data)
{
	return mtk_mii_rw(priv, phy, reg, data, MDIO_CMD_WRITE, MDIO_ST_C22);
}

/* Direct MDIO clause 45 read via SoC */
static int mtk_mmd_read(struct mtk_eth_priv *priv, u8 addr, u8 devad, u16 reg)
{
	int ret;

	ret = mtk_mii_rw(priv, addr, devad, reg, MDIO_CMD_ADDR, MDIO_ST_C45);
	if (ret)
		return ret;

	return mtk_mii_rw(priv, addr, devad, 0, MDIO_CMD_READ_C45,
			  MDIO_ST_C45);
}

/* Direct MDIO clause 45 write via SoC */
static int mtk_mmd_write(struct mtk_eth_priv *priv, u8 addr, u8 devad,
			 u16 reg, u16 val)
{
	int ret;

	ret = mtk_mii_rw(priv, addr, devad, reg, MDIO_CMD_ADDR, MDIO_ST_C45);
	if (ret)
		return ret;

	return mtk_mii_rw(priv, addr, devad, val, MDIO_CMD_WRITE,
			  MDIO_ST_C45);
}

/* Indirect MDIO clause 45 read via MII registers */
static int mtk_mmd_ind_read(struct mtk_eth_priv *priv, u8 addr, u8 devad,
			    u16 reg)
{
	int ret;

	ret = priv->mii_write(priv, addr, MII_MMD_ACC_CTL_REG,
			      (MMD_ADDR << MMD_CMD_S) |
			      ((devad << MMD_DEVAD_S) & MMD_DEVAD_M));
	if (ret)
		return ret;

	ret = priv->mii_write(priv, addr, MII_MMD_ADDR_DATA_REG, reg);
	if (ret)
		return ret;

	ret = priv->mii_write(priv, addr, MII_MMD_ACC_CTL_REG,
			      (MMD_DATA << MMD_CMD_S) |
			      ((devad << MMD_DEVAD_S) & MMD_DEVAD_M));
	if (ret)
		return ret;

	return priv->mii_read(priv, addr, MII_MMD_ADDR_DATA_REG);
}

/* Indirect MDIO clause 45 write via MII registers */
static int mtk_mmd_ind_write(struct mtk_eth_priv *priv, u8 addr, u8 devad,
			     u16 reg, u16 val)
{
	int ret;

	ret = priv->mii_write(priv, addr, MII_MMD_ACC_CTL_REG,
			      (MMD_ADDR << MMD_CMD_S) |
			      ((devad << MMD_DEVAD_S) & MMD_DEVAD_M));
	if (ret)
		return ret;

	ret = priv->mii_write(priv, addr, MII_MMD_ADDR_DATA_REG, reg);
	if (ret)
		return ret;

	ret = priv->mii_write(priv, addr, MII_MMD_ACC_CTL_REG,
			      (MMD_DATA << MMD_CMD_S) |
			      ((devad << MMD_DEVAD_S) & MMD_DEVAD_M));
	if (ret)
		return ret;

	return priv->mii_write(priv, addr, MII_MMD_ADDR_DATA_REG, val);
}

static int mtk_mdio_read(struct mii_dev *bus, int addr, int devad, int reg)
{
	struct mtk_eth_priv *priv = bus->priv;

	if (devad < 0)
		return priv->mii_read(priv, addr, reg);
	else
		return priv->mmd_read(priv, addr, devad, reg);
}

static int mtk_mdio_write(struct mii_dev *bus, int addr, int devad, int reg,
			  u16 val)
{
	struct mtk_eth_priv *priv = bus->priv;

	if (devad < 0)
		return priv->mii_write(priv, addr, reg, val);
	else
		return priv->mmd_write(priv, addr, devad, reg, val);
}

static int mtk_mdio_register(struct udevice *dev)
{
	struct mtk_eth_priv *priv = dev_get_priv(dev);
	struct mii_dev *mdio_bus = mdio_alloc();
	int ret;

	if (!mdio_bus)
		return -ENOMEM;

	/* Assign MDIO access APIs according to the switch/phy */
	switch (priv->sw) {
	case SW_MT7530:
		priv->mii_read = mtk_mii_read;
		priv->mii_write = mtk_mii_write;
		priv->mmd_read = mtk_mmd_ind_read;
		priv->mmd_write = mtk_mmd_ind_write;
		break;
	default:
		priv->mii_read = mtk_mii_read;
		priv->mii_write = mtk_mii_write;
		priv->mmd_read = mtk_mmd_read;
		priv->mmd_write = mtk_mmd_write;
	}

	mdio_bus->read = mtk_mdio_read;
	mdio_bus->write = mtk_mdio_write;
	snprintf(mdio_bus->name, sizeof(mdio_bus->name), dev->name);

	mdio_bus->priv = (void *)priv;

	ret = mdio_register(mdio_bus);

	if (ret)
		return ret;

	priv->mdio_bus = mdio_bus;

	return 0;
}

/*
 * MT7530 Internal Register Address Bits
 * -------------------------------------------------------------------
 * | 15  14  13  12  11  10   9   8   7   6 | 5   4   3   2 | 1   0  |
 * |----------------------------------------|---------------|--------|
 * |              Page Address              |  Reg Address  | Unused |
 * -------------------------------------------------------------------
 */

static int mt7530_reg_read(struct mtk_eth_priv *priv, u32 reg, u32 *data)
{
	int ret, low_word, high_word;

	/* Write page address */
	ret = mtk_mii_write(priv, priv->mt7530_smi_addr, 0x1f, reg >> 6);
	if (ret)
		return ret;

	/* Read low word */
	low_word = mtk_mii_read(priv, priv->mt7530_smi_addr, (reg >> 2) & 0xf);
	if (low_word < 0)
		return low_word;

	/* Read high word */
	high_word = mtk_mii_read(priv, priv->mt7530_smi_addr, 0x10);
	if (high_word < 0)
		return high_word;

	if (data)
		*data = ((u32)high_word << 16) | (low_word & 0xffff);

	return 0;
}

static int mt7530_reg_write(struct mtk_eth_priv *priv, u32 reg, u32 data)
{
	int ret;

	/* Write page address */
	ret = mtk_mii_write(priv, priv->mt7530_smi_addr, 0x1f, reg >> 6);
	if (ret)
		return ret;

	/* Write low word */
	ret = mtk_mii_write(priv, priv->mt7530_smi_addr, (reg >> 2) & 0xf,
			    data & 0xffff);
	if (ret)
		return ret;

	/* Write high word */
	return mtk_mii_write(priv, priv->mt7530_smi_addr, 0x10, data >> 16);
}

static void mt7530_reg_rmw(struct mtk_eth_priv *priv, u32 reg, u32 clr,
			   u32 set)
{
	u32 val;

	mt7530_reg_read(priv, reg, &val);
	val &= ~clr;
	val |= set;
	mt7530_reg_write(priv, reg, val);
}

static void mt7530_core_reg_write(struct mtk_eth_priv *priv, u32 reg, u32 val)
{
	u8 phy_addr = MT7530_PHY_ADDR(priv->mt7530_phy_base, 0);

	mtk_mmd_ind_write(priv, phy_addr, 0x1f, reg, val);
}

static int mt7530_pad_clk_setup(struct mtk_eth_priv *priv, int mode)
{
	u32 ncpo1, ssc_delta;

	switch (mode) {
	case PHY_INTERFACE_MODE_RGMII:
		ncpo1 = 0x0c80;
		ssc_delta = 0x87;
		break;
	default:
		printf("error: xMII mode %d not supported\n", mode);
		return -EINVAL;
	}

	/* Disable MT7530 core clock */
	mt7530_core_reg_write(priv, CORE_TRGMII_GSW_CLK_CG, 0);

	/* Disable MT7530 PLL */
	mt7530_core_reg_write(priv, CORE_GSWPLL_GRP1,
			      (2 << RG_GSWPLL_POSDIV_200M_S) |
			      (32 << RG_GSWPLL_FBKDIV_200M_S));

	/* For MT7530 core clock = 500Mhz */
	mt7530_core_reg_write(priv, CORE_GSWPLL_GRP2,
			      (1 << RG_GSWPLL_POSDIV_500M_S) |
			      (25 << RG_GSWPLL_FBKDIV_500M_S));

	/* Enable MT7530 PLL */
	mt7530_core_reg_write(priv, CORE_GSWPLL_GRP1,
			      (2 << RG_GSWPLL_POSDIV_200M_S) |
			      (32 << RG_GSWPLL_FBKDIV_200M_S) |
			      RG_GSWPLL_EN_PRE);

	udelay(20);

	mt7530_core_reg_write(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);

	/* Setup the MT7530 TRGMII Tx Clock */
	mt7530_core_reg_write(priv, CORE_PLL_GROUP5, ncpo1);
	mt7530_core_reg_write(priv, CORE_PLL_GROUP6, 0);
	mt7530_core_reg_write(priv, CORE_PLL_GROUP10, ssc_delta);
	mt7530_core_reg_write(priv, CORE_PLL_GROUP11, ssc_delta);
	mt7530_core_reg_write(priv, CORE_PLL_GROUP4, RG_SYSPLL_DDSFBK_EN |
			      RG_SYSPLL_BIAS_EN | RG_SYSPLL_BIAS_LPF_EN);

	mt7530_core_reg_write(priv, CORE_PLL_GROUP2,
			      RG_SYSPLL_EN_NORMAL | RG_SYSPLL_VODEN |
			      (1 << RG_SYSPLL_POSDIV_S));

	mt7530_core_reg_write(priv, CORE_PLL_GROUP7,
			      RG_LCDDS_PCW_NCPO_CHG | (3 << RG_LCCDS_C_S) |
			      RG_LCDDS_PWDB | RG_LCDDS_ISO_EN);

	/* Enable MT7530 core clock */
	mt7530_core_reg_write(priv, CORE_TRGMII_GSW_CLK_CG,
			      REG_GSWCK_EN | REG_TRGMIICK_EN);

	return 0;
}

static int mt7530_setup(struct mtk_eth_priv *priv)
{
	u16 phy_addr, phy_val;
	u32 val;
	int i;

	/* Select 250MHz clk for RGMII mode */
	mtk_ethsys_rmw(priv, ETHSYS_CLKCFG0_REG,
		       ETHSYS_TRGMII_CLK_SEL362_5, 0);

	/* Global reset switch */
	if (priv->mcm) {
		reset_assert(&priv->rst_mcm);
		udelay(1000);
		reset_deassert(&priv->rst_mcm);
		mdelay(1000);
	} else if (dm_gpio_is_valid(&priv->rst_gpio)) {
		dm_gpio_set_value(&priv->rst_gpio, 0);
		udelay(1000);
		dm_gpio_set_value(&priv->rst_gpio, 1);
		mdelay(1000);
	}

	/* Modify HWTRAP first to allow direct access to internal PHYs */
	mt7530_reg_read(priv, HWTRAP_REG, &val);
	val |= CHG_TRAP;
	val &= ~C_MDIO_BPS;
	mt7530_reg_write(priv, MHWTRAP_REG, val);

	/* Calculate the phy base address */
	val = ((val & SMI_ADDR_M) >> SMI_ADDR_S) << 3;
	priv->mt7530_phy_base = (val | 0x7) + 1;

	/* Turn off PHYs */
	for (i = 0; i < MT7530_NUM_PHYS; i++) {
		phy_addr = MT7530_PHY_ADDR(priv->mt7530_phy_base, i);
		phy_val = priv->mii_read(priv, phy_addr, MII_BMCR);
		phy_val |= BMCR_PDOWN;
		priv->mii_write(priv, phy_addr, MII_BMCR, phy_val);
	}

	/* Force MAC link down before reset */
	mt7530_reg_write(priv, PCMR_REG(5), FORCE_MODE);
	mt7530_reg_write(priv, PCMR_REG(6), FORCE_MODE);

	/* MT7530 reset */
	mt7530_reg_write(priv, SYS_CTRL_REG, SW_SYS_RST | SW_REG_RST);
	udelay(100);

	val = (1 << IPG_CFG_S) |
	      MAC_MODE | FORCE_MODE |
	      MAC_TX_EN | MAC_RX_EN |
	      BKOFF_EN | BACKPR_EN |
	      (SPEED_1000M << FORCE_SPD_S) |
	      FORCE_DPX | FORCE_LINK;

	/* MT7530 Port6: Forced 1000M/FD, FC disabled */
	mt7530_reg_write(priv, PCMR_REG(6), val);

	/* MT7530 Port5: Forced link down */
	mt7530_reg_write(priv, PCMR_REG(5), FORCE_MODE);

	/* MT7530 Port6: Set to RGMII */
	mt7530_reg_rmw(priv, MT7530_P6ECR, P6_INTF_MODE_M, P6_INTF_MODE_RGMII);

	/* Hardware Trap: Enable Port6, Disable Port5 */
	mt7530_reg_read(priv, HWTRAP_REG, &val);
	val |= CHG_TRAP | LOOPDET_DIS | P5_INTF_DIS |
	       (P5_INTF_SEL_GMAC5 << P5_INTF_SEL_S) |
	       (P5_INTF_MODE_RGMII << P5_INTF_MODE_S);
	val &= ~(C_MDIO_BPS | P6_INTF_DIS);
	mt7530_reg_write(priv, MHWTRAP_REG, val);

	/* Setup switch core pll */
	mt7530_pad_clk_setup(priv, priv->phy_interface);

	/* Lower Tx Driving for TRGMII path */
	for (i = 0 ; i < NUM_TRGMII_CTRL ; i++)
		mt7530_reg_write(priv, MT7530_TRGMII_TD_ODT(i),
				 (8 << TD_DM_DRVP_S) | (8 << TD_DM_DRVN_S));

	for (i = 0 ; i < NUM_TRGMII_CTRL; i++)
		mt7530_reg_rmw(priv, MT7530_TRGMII_RD(i), RD_TAP_M, 16);

	/* Turn on PHYs */
	for (i = 0; i < MT7530_NUM_PHYS; i++) {
		phy_addr = MT7530_PHY_ADDR(priv->mt7530_phy_base, i);
		phy_val = priv->mii_read(priv, phy_addr, MII_BMCR);
		phy_val &= ~BMCR_PDOWN;
		priv->mii_write(priv, phy_addr, MII_BMCR, phy_val);
	}

	/* Set port isolation */
	for (i = 0; i < 8; i++) {
		/* Set port matrix mode */
		if (i != 6)
			mt7530_reg_write(priv, PCR_REG(i),
					 (0x40 << PORT_MATRIX_S));
		else
			mt7530_reg_write(priv, PCR_REG(i),
					 (0x3f << PORT_MATRIX_S));

		/* Set port mode to user port */
		mt7530_reg_write(priv, PVC_REG(i),
				 (0x8100 << STAG_VPID_S) |
				 (VLAN_ATTR_USER << VLAN_ATTR_S));
	}

	return 0;
}

static void mtk_phy_link_adjust(struct mtk_eth_priv *priv)
{
	u16 lcl_adv = 0, rmt_adv = 0;
	u8 flowctrl;
	u32 mcr;

	mcr = (1 << IPG_CFG_S) |
	      (MAC_RX_PKT_LEN_1536 << MAC_RX_PKT_LEN_S) |
	      MAC_MODE | FORCE_MODE |
	      MAC_TX_EN | MAC_RX_EN |
	      BKOFF_EN | BACKPR_EN;

	switch (priv->phydev->speed) {
	case SPEED_10:
		mcr |= (SPEED_10M << FORCE_SPD_S);
		break;
	case SPEED_100:
		mcr |= (SPEED_100M << FORCE_SPD_S);
		break;
	case SPEED_1000:
		mcr |= (SPEED_1000M << FORCE_SPD_S);
		break;
	};

	if (priv->phydev->link)
		mcr |= FORCE_LINK;

	if (priv->phydev->duplex) {
		mcr |= FORCE_DPX;

		if (priv->phydev->pause)
			rmt_adv = LPA_PAUSE_CAP;
		if (priv->phydev->asym_pause)
			rmt_adv |= LPA_PAUSE_ASYM;

		if (priv->phydev->advertising & ADVERTISED_Pause)
			lcl_adv |= ADVERTISE_PAUSE_CAP;
		if (priv->phydev->advertising & ADVERTISED_Asym_Pause)
			lcl_adv |= ADVERTISE_PAUSE_ASYM;

		flowctrl = mii_resolve_flowctrl_fdx(lcl_adv, rmt_adv);

		if (flowctrl & FLOW_CTRL_TX)
			mcr |= FORCE_TX_FC;
		if (flowctrl & FLOW_CTRL_RX)
			mcr |= FORCE_RX_FC;

		debug("rx pause %s, tx pause %s\n",
		      flowctrl & FLOW_CTRL_RX ? "enabled" : "disabled",
		      flowctrl & FLOW_CTRL_TX ? "enabled" : "disabled");
	}

	mtk_gmac_write(priv, GMAC_PORT_MCR(priv->gmac_id), mcr);
}

static int mtk_phy_start(struct mtk_eth_priv *priv)
{
	struct phy_device *phydev = priv->phydev;
	int ret;

	ret = phy_startup(phydev);

	if (ret) {
		debug("Could not initialize PHY %s\n", phydev->dev->name);
		return ret;
	}

	if (!phydev->link) {
		debug("%s: link down.\n", phydev->dev->name);
		return 0;
	}

	mtk_phy_link_adjust(priv);

	debug("Speed: %d, %s duplex%s\n", phydev->speed,
	      (phydev->duplex) ? "full" : "half",
	      (phydev->port == PORT_FIBRE) ? ", fiber mode" : "");

	return 0;
}

static int mtk_phy_probe(struct udevice *dev)
{
	struct mtk_eth_priv *priv = dev_get_priv(dev);
	struct phy_device *phydev;

	phydev = phy_connect(priv->mdio_bus, priv->phy_addr, dev,
			     priv->phy_interface);
	if (!phydev)
		return -ENODEV;

	phydev->supported &= PHY_GBIT_FEATURES;
	phydev->advertising = phydev->supported;

	priv->phydev = phydev;
	phy_config(phydev);

	return 0;
}

static void mtk_mac_init(struct mtk_eth_priv *priv)
{
	int i, ge_mode = 0;
	u32 mcr;

	switch (priv->phy_interface) {
	case PHY_INTERFACE_MODE_RGMII_RXID:
	case PHY_INTERFACE_MODE_RGMII:
	case PHY_INTERFACE_MODE_SGMII:
		ge_mode = GE_MODE_RGMII;
		break;
	case PHY_INTERFACE_MODE_MII:
	case PHY_INTERFACE_MODE_GMII:
		ge_mode = GE_MODE_MII;
		break;
	case PHY_INTERFACE_MODE_RMII:
		ge_mode = GE_MODE_RMII;
		break;
	default:
		break;
	}

	/* set the gmac to the right mode */
	mtk_ethsys_rmw(priv, ETHSYS_SYSCFG0_REG,
		       SYSCFG0_GE_MODE_M << SYSCFG0_GE_MODE_S(priv->gmac_id),
		       ge_mode << SYSCFG0_GE_MODE_S(priv->gmac_id));

	if (priv->force_mode) {
		mcr = (1 << IPG_CFG_S) |
		      (MAC_RX_PKT_LEN_1536 << MAC_RX_PKT_LEN_S) |
		      MAC_MODE | FORCE_MODE |
		      MAC_TX_EN | MAC_RX_EN |
		      BKOFF_EN | BACKPR_EN |
		      FORCE_LINK;

		switch (priv->speed) {
		case SPEED_10:
			mcr |= SPEED_10M << FORCE_SPD_S;
			break;
		case SPEED_100:
			mcr |= SPEED_100M << FORCE_SPD_S;
			break;
		case SPEED_1000:
			mcr |= SPEED_1000M << FORCE_SPD_S;
			break;
		}

		if (priv->duplex)
			mcr |= FORCE_DPX;

		mtk_gmac_write(priv, GMAC_PORT_MCR(priv->gmac_id), mcr);
	}

	if (priv->soc == SOC_MT7623) {
		/* Lower Tx Driving for TRGMII path */
		for (i = 0 ; i < NUM_TRGMII_CTRL; i++)
			mtk_gmac_write(priv, GMAC_TRGMII_TD_ODT(i),
				       (8 << TD_DM_DRVP_S) |
				       (8 << TD_DM_DRVN_S));

		mtk_gmac_rmw(priv, GMAC_TRGMII_RCK_CTRL, 0,
			     RX_RST | RXC_DQSISEL);
		mtk_gmac_rmw(priv, GMAC_TRGMII_RCK_CTRL, RX_RST, 0);
	}
}

static void mtk_eth_fifo_init(struct mtk_eth_priv *priv)
{
	char *pkt_base = priv->pkt_pool;
	int i;

	mtk_pdma_rmw(priv, PDMA_GLO_CFG_REG, 0xffff0000, 0);
	udelay(500);

	memset(priv->tx_ring_noc, 0, NUM_TX_DESC * sizeof(struct pdma_txdesc));
	memset(priv->rx_ring_noc, 0, NUM_RX_DESC * sizeof(struct pdma_rxdesc));
	memset(priv->pkt_pool, 0, TOTAL_PKT_BUF_SIZE);

	flush_dcache_range((u32)pkt_base, (u32)(pkt_base + TOTAL_PKT_BUF_SIZE));

	priv->rx_dma_owner_idx0 = 0;
	priv->tx_cpu_owner_idx0 = 0;

	for (i = 0; i < NUM_TX_DESC; i++) {
		priv->tx_ring_noc[i].txd_info2.LS0 = 1;
		priv->tx_ring_noc[i].txd_info2.DDONE = 1;
		priv->tx_ring_noc[i].txd_info4.FPORT = priv->gmac_id + 1;

		priv->tx_ring_noc[i].txd_info1.SDP0 = virt_to_phys(pkt_base);
		pkt_base += PKTSIZE_ALIGN;
	}

	for (i = 0; i < NUM_RX_DESC; i++) {
		priv->rx_ring_noc[i].rxd_info2.PLEN0 = PKTSIZE_ALIGN;
		priv->rx_ring_noc[i].rxd_info1.PDP0 = virt_to_phys(pkt_base);
		pkt_base += PKTSIZE_ALIGN;
	}

	mtk_pdma_write(priv, TX_BASE_PTR_REG(0),
		       virt_to_phys(priv->tx_ring_noc));
	mtk_pdma_write(priv, TX_MAX_CNT_REG(0), NUM_TX_DESC);
	mtk_pdma_write(priv, TX_CTX_IDX_REG(0), priv->tx_cpu_owner_idx0);

	mtk_pdma_write(priv, RX_BASE_PTR_REG(0),
		       virt_to_phys(priv->rx_ring_noc));
	mtk_pdma_write(priv, RX_MAX_CNT_REG(0), NUM_RX_DESC);
	mtk_pdma_write(priv, RX_CRX_IDX_REG(0), NUM_RX_DESC - 1);

	mtk_pdma_write(priv, PDMA_RST_IDX_REG, RST_DTX_IDX0 | RST_DRX_IDX0);
}

static int mtk_eth_start(struct udevice *dev)
{
	struct mtk_eth_priv *priv = dev_get_priv(dev);
	int ret;

	/* Reset FE */
	reset_assert(&priv->rst_fe);
	udelay(1000);
	reset_deassert(&priv->rst_fe);
	mdelay(10);

	/* Packets forward to PDMA */
	mtk_gdma_write(priv, priv->gmac_id, GDMA_IG_CTRL_REG, GDMA_FWD_TO_CPU);

	if (priv->gmac_id == 0)
		mtk_gdma_write(priv, 1, GDMA_IG_CTRL_REG, GDMA_FWD_DISCARD);
	else
		mtk_gdma_write(priv, 0, GDMA_IG_CTRL_REG, GDMA_FWD_DISCARD);

	udelay(500);

	mtk_eth_fifo_init(priv);

	/* Start PHY */
	if (priv->sw == SW_NONE) {
		ret = mtk_phy_start(priv);
		if (ret)
			return ret;
	}

	mtk_pdma_rmw(priv, PDMA_GLO_CFG_REG, 0,
		     TX_WB_DDONE | RX_DMA_EN | TX_DMA_EN);
	udelay(500);

	return 0;
}

static void mtk_eth_stop(struct udevice *dev)
{
	struct mtk_eth_priv *priv = dev_get_priv(dev);

	mtk_pdma_rmw(priv, PDMA_GLO_CFG_REG,
		     TX_WB_DDONE | RX_DMA_EN | TX_DMA_EN, 0);
	udelay(500);

	wait_for_bit_le32(priv->fe_base + PDMA_BASE + PDMA_GLO_CFG_REG,
			  RX_DMA_BUSY | TX_DMA_BUSY, 0, 5000, 0);
}

static int mtk_eth_write_hwaddr(struct udevice *dev)
{
	struct eth_pdata *pdata = dev_get_platdata(dev);
	struct mtk_eth_priv *priv = dev_get_priv(dev);
	unsigned char *mac = pdata->enetaddr;
	u32 macaddr_lsb, macaddr_msb;

	macaddr_msb = ((u32)mac[0] << 8) | (u32)mac[1];
	macaddr_lsb = ((u32)mac[2] << 24) | ((u32)mac[3] << 16) |
		      ((u32)mac[4] << 8) | (u32)mac[5];

	mtk_gdma_write(priv, priv->gmac_id, GDMA_MAC_MSB_REG, macaddr_msb);
	mtk_gdma_write(priv, priv->gmac_id, GDMA_MAC_LSB_REG, macaddr_lsb);

	return 0;
}

static int mtk_eth_send(struct udevice *dev, void *packet, int length)
{
	struct mtk_eth_priv *priv = dev_get_priv(dev);
	u32 idx = priv->tx_cpu_owner_idx0;
	void *pkt_base;

	if (!priv->tx_ring_noc[idx].txd_info2.DDONE) {
		debug("mtk-eth: TX DMA descriptor ring is full\n");
		return -EPERM;
	}

	pkt_base = (void *)phys_to_virt(priv->tx_ring_noc[idx].txd_info1.SDP0);
	memcpy(pkt_base, packet, length);
	flush_dcache_range((u32)pkt_base, (u32)pkt_base +
			   roundup(length, ARCH_DMA_MINALIGN));

	priv->tx_ring_noc[idx].txd_info2.SDL0 = length;
	priv->tx_ring_noc[idx].txd_info2.DDONE = 0;

	priv->tx_cpu_owner_idx0 = (priv->tx_cpu_owner_idx0 + 1) % NUM_TX_DESC;
	mtk_pdma_write(priv, TX_CTX_IDX_REG(0), priv->tx_cpu_owner_idx0);

	return 0;
}

static int mtk_eth_recv(struct udevice *dev, int flags, uchar **packetp)
{
	struct mtk_eth_priv *priv = dev_get_priv(dev);
	u32 idx = priv->rx_dma_owner_idx0;
	uchar *pkt_base;
	u32 length;

	if (!priv->rx_ring_noc[idx].rxd_info2.DDONE) {
		debug("mtk-eth: RX DMA descriptor ring is empty\n");
		return -EAGAIN;
	}

	length = priv->rx_ring_noc[idx].rxd_info2.PLEN0;
	pkt_base = (void *)phys_to_virt(priv->rx_ring_noc[idx].rxd_info1.PDP0);
	invalidate_dcache_range((u32)pkt_base, (u32)pkt_base +
				roundup(length, ARCH_DMA_MINALIGN));

	if (packetp)
		*packetp = pkt_base;

	return length;
}

static int mtk_eth_free_pkt(struct udevice *dev, uchar *packet, int length)
{
	struct mtk_eth_priv *priv = dev_get_priv(dev);
	u32 idx = priv->rx_dma_owner_idx0;

	priv->rx_ring_noc[idx].rxd_info2.DDONE = 0;
	priv->rx_ring_noc[idx].rxd_info2.LS0 = 0;
	priv->rx_ring_noc[idx].rxd_info2.PLEN0 = PKTSIZE_ALIGN;

	mtk_pdma_write(priv, RX_CRX_IDX_REG(0), idx);
	priv->rx_dma_owner_idx0 = (priv->rx_dma_owner_idx0 + 1) % NUM_RX_DESC;

	return 0;
}

static int mtk_eth_probe(struct udevice *dev)
{
	struct eth_pdata *pdata = dev_get_platdata(dev);
	struct mtk_eth_priv *priv = dev_get_priv(dev);
	u32 iobase = pdata->iobase;
	int ret;

	/* Frame Engine Register Base */
	priv->fe_base = (void *)iobase;

	/* GMAC Register Base */
	priv->gmac_base = (void *)(iobase + GMAC_BASE);

	/* MDIO register */
	ret = mtk_mdio_register(dev);
	if (ret)
		return ret;

	/* Prepare for tx/rx rings */
	priv->tx_ring_noc = (struct pdma_txdesc *)
		noncached_alloc(sizeof(struct pdma_txdesc) * NUM_TX_DESC,
				ARCH_DMA_MINALIGN);
	priv->rx_ring_noc = (struct pdma_rxdesc *)
		noncached_alloc(sizeof(struct pdma_rxdesc) * NUM_RX_DESC,
				ARCH_DMA_MINALIGN);

	/* Set MAC mode */
	mtk_mac_init(priv);

	/* Probe phy if switch is not specified */
	if (priv->sw == SW_NONE)
		return mtk_phy_probe(dev);

	/* Initialize switch */
	return priv->switch_init(priv);
}

static int mtk_eth_remove(struct udevice *dev)
{
	struct mtk_eth_priv *priv = dev_get_priv(dev);

	/* MDIO unregister */
	mdio_unregister(priv->mdio_bus);
	mdio_free(priv->mdio_bus);

	/* Stop possibly started DMA */
	mtk_eth_stop(dev);

	return 0;
}

static int mtk_eth_ofdata_to_platdata(struct udevice *dev)
{
	struct eth_pdata *pdata = dev_get_platdata(dev);
	struct mtk_eth_priv *priv = dev_get_priv(dev);
	struct ofnode_phandle_args args;
	struct regmap *regmap;
	const char *str;
	ofnode subnode;
	int ret;

	priv->soc = dev_get_driver_data(dev);

	pdata->iobase = devfdt_get_addr(dev);

	/* get corresponding ethsys phandle */
	ret = dev_read_phandle_with_args(dev, "mediatek,ethsys", NULL, 0, 0,
					 &args);
	if (ret)
		return ret;

	regmap = syscon_node_to_regmap(args.node);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	priv->ethsys_base = regmap_get_range(regmap, 0);
	if (!priv->ethsys_base) {
		dev_err(dev, "Unable to find ethsys\n");
		return -ENODEV;
	}

	/* Reset controllers */
	ret = reset_get_by_name(dev, "fe", &priv->rst_fe);
	if (ret) {
		printf("error: Unable to get reset ctrl for frame engine\n");
		return ret;
	}

	priv->gmac_id = dev_read_u32_default(dev, "mediatek,gmac-id", 0);

	/* Interface mode is required */
	str = dev_read_string(dev, "phy-mode");
	if (str) {
		pdata->phy_interface = phy_get_interface_by_name(str);
		priv->phy_interface = pdata->phy_interface;
	} else {
		printf("error: phy-mode is not set\n");
		return -EINVAL;
	}

	/* Force mode or autoneg */
	subnode = ofnode_find_subnode(dev_ofnode(dev), "fixed-link");
	if (ofnode_valid(subnode)) {
		priv->force_mode = 1;
		priv->speed = ofnode_read_u32_default(subnode, "speed", 0);
		priv->duplex = ofnode_read_bool(subnode, "full-duplex");

		if (priv->speed != SPEED_10 && priv->speed != SPEED_100 &&
		    priv->speed != SPEED_1000) {
			printf("error: no valid speed set in fixed-link\n");
			return -EINVAL;
		}
	}

	/* check for switch first, otherwise phy will be used */
	priv->sw = SW_NONE;
	priv->switch_init = NULL;
	str = dev_read_string(dev, "mediatek,switch");

	if (str) {
		if (!strcmp(str, "mt7530")) {
			priv->sw = SW_MT7530;
			priv->switch_init = mt7530_setup;
			priv->mt7530_smi_addr = MT7530_DFL_SMI_ADDR;
		} else {
			printf("error: unsupported switch\n");
			return -EINVAL;
		}

		priv->mcm = dev_read_bool(dev, "mediatek,mcm");
		if (priv->mcm) {
			ret = reset_get_by_name(dev, "mcm", &priv->rst_mcm);
			if (ret) {
				printf("error: no reset ctrl for mcm\n");
				return ret;
			}
		} else {
			gpio_request_by_name(dev, "reset-gpios", 0,
					     &priv->rst_gpio, GPIOD_IS_OUT);
		}
	} else {
		ret = dev_read_phandle_with_args(dev, "phy-handle", NULL, 0,
						 0, &args);
		if (ret) {
			printf("error: phy-handle is not specified\n");
			return ret;
		}

		priv->phy_addr = ofnode_read_s32_default(args.node, "reg", -1);
		if (priv->phy_addr < 0) {
			printf("error: phy address is not specified\n");
			return ret;
		}
	}

	return 0;
}

static const struct udevice_id mtk_eth_ids[] = {
	{ .compatible = "mediatek,mt7629-eth", .data = SOC_MT7629 },
	{ .compatible = "mediatek,mt7623-eth", .data = SOC_MT7623 },
	{}
};

static const struct eth_ops mtk_eth_ops = {
	.start = mtk_eth_start,
	.stop = mtk_eth_stop,
	.send = mtk_eth_send,
	.recv = mtk_eth_recv,
	.free_pkt = mtk_eth_free_pkt,
	.write_hwaddr = mtk_eth_write_hwaddr,
};

U_BOOT_DRIVER(mtk_eth) = {
	.name = "mtk-eth",
	.id = UCLASS_ETH,
	.of_match = mtk_eth_ids,
	.ofdata_to_platdata = mtk_eth_ofdata_to_platdata,
	.platdata_auto_alloc_size = sizeof(struct eth_pdata),
	.probe = mtk_eth_probe,
	.remove = mtk_eth_remove,
	.ops = &mtk_eth_ops,
	.priv_auto_alloc_size = sizeof(struct mtk_eth_priv),
	.flags = DM_FLAG_ALLOC_PRIV_DMA,
};