drivers/phy/phy-zynqmp.c

// SPDX-License-Identifier: GPL-2.0
/*
 * phy-zynqmp.c - PHY driver for Xilinx ZynqMP GT.
 *
 * Copyright (C) 2018-2021 Xilinx Inc.
 *
 * Author: Anurag Kumar Vulisha <anuragku@xilinx.com>
 * Author: Subbaraya Sundeep <sundeep.lkml@gmail.com>
 * Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 */

#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <generic-phy.h>
#include <log.h>
#include <power-domain.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/io.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/hardware.h>
#include <dm/device.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <dt-bindings/phy/phy.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/err.h>

/*
 * Lane Registers
 */

/* TX De-emphasis parameters */
#define L0_TX_ANA_TM_18			0x0048
#define L0_TX_ANA_TM_118		0x01d8
#define L0_TX_ANA_TM_118_FORCE_17_0	BIT(0)

/* DN Resistor calibration code parameters */
#define L0_TXPMA_ST_3			0x0b0c
#define L0_DN_CALIB_CODE		0x3f

/* PMA control parameters */
#define L0_TXPMD_TM_45			0x0cb4
#define L0_TXPMD_TM_48			0x0cc0
#define L0_TXPMD_TM_45_OVER_DP_MAIN	BIT(0)
#define L0_TXPMD_TM_45_ENABLE_DP_MAIN	BIT(1)
#define L0_TXPMD_TM_45_OVER_DP_POST1	BIT(2)
#define L0_TXPMD_TM_45_ENABLE_DP_POST1	BIT(3)
#define L0_TXPMD_TM_45_OVER_DP_POST2	BIT(4)
#define L0_TXPMD_TM_45_ENABLE_DP_POST2	BIT(5)

/* PCS control parameters */
#define L0_TM_DIG_6			0x106c
#define L0_TM_DIS_DESCRAMBLE_DECODER	0x0f
#define L0_TX_DIG_61			0x00f4
#define L0_TM_DISABLE_SCRAMBLE_ENCODER	0x0f

/* PLL Test Mode register parameters */
#define L0_TM_PLL_DIG_37		0x2094
#define L0_TM_COARSE_CODE_LIMIT		0x10

/* PLL SSC step size offsets */
#define L0_PLL_SS_STEPS_0_LSB		0x2368
#define L0_PLL_SS_STEPS_1_MSB		0x236c
#define L0_PLL_SS_STEP_SIZE_0_LSB	0x2370
#define L0_PLL_SS_STEP_SIZE_1		0x2374
#define L0_PLL_SS_STEP_SIZE_2		0x2378
#define L0_PLL_SS_STEP_SIZE_3_MSB	0x237c
#define L0_PLL_STATUS_READ_1		0x23e4

/* SSC step size parameters */
#define STEP_SIZE_0_MASK		0xff
#define STEP_SIZE_1_MASK		0xff
#define STEP_SIZE_2_MASK		0xff
#define STEP_SIZE_3_MASK		0x3
#define STEP_SIZE_SHIFT			8
#define FORCE_STEP_SIZE			0x10
#define FORCE_STEPS			0x20
#define STEPS_0_MASK			0xff
#define STEPS_1_MASK			0x07

/* Reference clock selection parameters */
#define L0_Ln_REF_CLK_SEL(n)		(0x2860 + (n) * 4)
#define L0_REF_CLK_SEL_MASK		0x8f

/* Calibration digital logic parameters */
#define L3_TM_CALIB_DIG19		0xec4c
#define L3_CALIB_DONE_STATUS		0xef14
#define L3_TM_CALIB_DIG18		0xec48
#define L3_TM_CALIB_DIG19_NSW		0x07
#define L3_TM_CALIB_DIG18_NSW		0xe0
#define L3_TM_OVERRIDE_NSW_CODE         0x20
#define L3_CALIB_DONE			0x02
#define L3_NSW_SHIFT			5
#define L3_NSW_PIPE_SHIFT		4
#define L3_NSW_CALIB_SHIFT		3

#define PHY_REG_OFFSET			0x4000

/*
 * Global Registers
 */

/* Refclk selection parameters */
#define PLL_REF_SEL(n)			(0x10000 + (n) * 4)
#define PLL_FREQ_MASK			0x1f
#define PLL_STATUS_LOCKED		0x10

/* Inter Connect Matrix parameters */
#define ICM_CFG0			0x10010
#define ICM_CFG1			0x10014
#define ICM_CFG0_L0_MASK		0x07
#define ICM_CFG0_L1_MASK		0x70
#define ICM_CFG1_L2_MASK		0x07
#define ICM_CFG2_L3_MASK		0x70
#define ICM_CFG_SHIFT			4

/* Inter Connect Matrix allowed protocols */
#define ICM_PROTOCOL_PD			0x0
#define ICM_PROTOCOL_PCIE		0x1
#define ICM_PROTOCOL_SATA		0x2
#define ICM_PROTOCOL_USB		0x3
#define ICM_PROTOCOL_DP			0x4
#define ICM_PROTOCOL_SGMII		0x5

/* Test Mode common reset control  parameters */
#define TM_CMN_RST			0x10018
#define TM_CMN_RST_EN			0x1
#define TM_CMN_RST_SET			0x2
#define TM_CMN_RST_MASK			0x3

/* Bus width parameters */
#define TX_PROT_BUS_WIDTH		0x10040
#define RX_PROT_BUS_WIDTH		0x10044
#define PROT_BUS_WIDTH_10		0x0
#define PROT_BUS_WIDTH_20		0x1
#define PROT_BUS_WIDTH_40		0x2
#define PROT_BUS_WIDTH_MASK		0x3
#define PROT_BUS_WIDTH_SHIFT		2

/* Number of GT lanes */
#define NUM_LANES			4

/* SIOU SATA control register */
#define SATA_CONTROL_OFFSET		0x0100

/* Total number of controllers */
#define CONTROLLERS_PER_LANE		5

/* Protocol Type parameters */
enum {
	XPSGTR_TYPE_USB0 = 0, /* USB controller 0 */
	XPSGTR_TYPE_USB1 = 1, /* USB controller 1 */
	XPSGTR_TYPE_SATA_0 = 2, /* SATA controller lane 0 */
	XPSGTR_TYPE_SATA_1 = 3, /* SATA controller lane 1 */
	XPSGTR_TYPE_PCIE_0 = 4, /* PCIe controller lane 0 */
	XPSGTR_TYPE_PCIE_1 = 5, /* PCIe controller lane 1 */
	XPSGTR_TYPE_PCIE_2 = 6, /* PCIe controller lane 2 */
	XPSGTR_TYPE_PCIE_3 = 7, /* PCIe controller lane 3 */
	XPSGTR_TYPE_DP_0 = 8, /* Display Port controller lane 0 */
	XPSGTR_TYPE_DP_1 = 9, /* Display Port controller lane 1 */
	XPSGTR_TYPE_SGMII0 = 10, /* Ethernet SGMII controller 0 */
	XPSGTR_TYPE_SGMII1 = 11, /* Ethernet SGMII controller 1 */
	XPSGTR_TYPE_SGMII2 = 12, /* Ethernet SGMII controller 2 */
	XPSGTR_TYPE_SGMII3 = 13, /* Ethernet SGMII controller 3 */
};

/* Timeout values */
#define TIMEOUT_US			1000

#define IOU_SLCR_GEM_CLK_CTRL		0x308
#define GEM_CTRL_GEM_SGMII_MODE		BIT(2)
#define GEM_CTRL_GEM_REF_SRC_SEL	BIT(1)

#define IOU_SLCR_GEM_CTRL		0x360
#define GEM_CTRL_GEM_SGMII_SD		BIT(0)

/**
 * struct xpsgtr_ssc - structure to hold SSC settings for a lane
 * @refclk_rate: PLL reference clock frequency
 * @pll_ref_clk: value to be written to register for corresponding ref clk rate
 * @steps: number of steps of SSC (Spread Spectrum Clock)
 * @step_size: step size of each step
 */
struct xpsgtr_ssc {
	u32 refclk_rate;
	u8  pll_ref_clk;
	u32 steps;
	u32 step_size;
};

/**
 * struct xpsgtr_phy - representation of a lane
 * @dev: pointer to the xpsgtr_dev instance
 * @refclk: reference clock index
 * @type: controller which uses this lane
 * @lane: lane number
 * @protocol: protocol in which the lane operates
 */
struct xpsgtr_phy {
	struct xpsgtr_dev *dev;
	unsigned int refclk;
	u8 type;
	u8 lane;
	u8 protocol;
};

/**
 * struct xpsgtr_dev - representation of a ZynMP GT device
 * @dev: pointer to device
 * @serdes: serdes base address
 * @siou: siou base address
 * @phys: PHY lanes
 * @refclk_sscs: spread spectrum settings for the reference clocks
 * @clk: reference clocks
 */
struct xpsgtr_dev {
	struct udevice *dev;
	u8 *serdes;
	u8 *siou;
	struct xpsgtr_phy phys[NUM_LANES];
	const struct xpsgtr_ssc *refclk_sscs[NUM_LANES];
	struct clk clk[NUM_LANES];
};

/* Configuration Data */
/* lookup table to hold all settings needed for a ref clock frequency */
static const struct xpsgtr_ssc ssc_lookup[] = {
	{  19200000, 0x05,  608, 264020 },
	{  20000000, 0x06,  634, 243454 },
	{  24000000, 0x07,  760, 168973 },
	{  26000000, 0x08,  824, 143860 },
	{  27000000, 0x09,  856,  86551 },
	{  38400000, 0x0a, 1218,  65896 },
	{  40000000, 0x0b,  634, 243454 },
	{  52000000, 0x0c,  824, 143860 },
	{ 100000000, 0x0d, 1058,  87533 },
	{ 108000000, 0x0e,  856,  86551 },
	{ 125000000, 0x0f,  992, 119497 },
	{ 135000000, 0x10, 1070,  55393 },
	{ 150000000, 0x11,  792, 187091 }
};

/* I/O Accessors */
static u32 xpsgtr_read(struct xpsgtr_dev *gtr_dev, u32 reg)
{
	return readl(gtr_dev->serdes + reg);
}

static void xpsgtr_write(struct xpsgtr_dev *gtr_dev, u32 reg, u32 value)
{
	writel(value, gtr_dev->serdes + reg);
}

static void xpsgtr_clr_set(struct xpsgtr_dev *gtr_dev, u32 reg,
			   u32 clr, u32 set)
{
	u32 value = xpsgtr_read(gtr_dev, reg);

	value &= ~clr;
	value |= set;
	xpsgtr_write(gtr_dev, reg, value);
}

static u32 xpsgtr_read_phy(struct xpsgtr_phy *gtr_phy, u32 reg)
{
	void __iomem *addr = gtr_phy->dev->serdes
			   + gtr_phy->lane * PHY_REG_OFFSET + reg;

	return readl(addr);
}

static void xpsgtr_write_phy(struct xpsgtr_phy *gtr_phy,
			     u32 reg, u32 value)
{
	void __iomem *addr = gtr_phy->dev->serdes
			   + gtr_phy->lane * PHY_REG_OFFSET + reg;

	writel(value, addr);
}

static void xpsgtr_clr_set_phy(struct xpsgtr_phy *gtr_phy,
			       u32 reg, u32 clr, u32 set)
{
	void __iomem *addr = gtr_phy->dev->serdes
			   + gtr_phy->lane * PHY_REG_OFFSET + reg;

	writel((readl(addr) & ~clr) | set, addr);
}

/* Configure PLL and spread-sprectrum clock. */
static void xpsgtr_configure_pll(struct xpsgtr_phy *gtr_phy)
{
	const struct xpsgtr_ssc *ssc;
	u32 step_size;

	ssc = gtr_phy->dev->refclk_sscs[gtr_phy->refclk];
	step_size = ssc->step_size;

	xpsgtr_clr_set(gtr_phy->dev, PLL_REF_SEL(gtr_phy->lane),
		       PLL_FREQ_MASK, ssc->pll_ref_clk);

	/* Enable lane clock sharing, if required */
	if (gtr_phy->refclk != gtr_phy->lane) {
		/* Lane3 Ref Clock Selection Register */
		xpsgtr_clr_set(gtr_phy->dev, L0_Ln_REF_CLK_SEL(gtr_phy->lane),
			       L0_REF_CLK_SEL_MASK, 1 << gtr_phy->refclk);
	}

	/* SSC step size [7:0] */
	xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEP_SIZE_0_LSB,
			   STEP_SIZE_0_MASK, step_size & STEP_SIZE_0_MASK);

	/* SSC step size [15:8] */
	step_size >>= STEP_SIZE_SHIFT;
	xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEP_SIZE_1,
			   STEP_SIZE_1_MASK, step_size & STEP_SIZE_1_MASK);

	/* SSC step size [23:16] */
	step_size >>= STEP_SIZE_SHIFT;
	xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEP_SIZE_2,
			   STEP_SIZE_2_MASK, step_size & STEP_SIZE_2_MASK);

	/* SSC steps [7:0] */
	xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEPS_0_LSB,
			   STEPS_0_MASK, ssc->steps & STEPS_0_MASK);

	/* SSC steps [10:8] */
	xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEPS_1_MSB,
			   STEPS_1_MASK,
			   (ssc->steps >> STEP_SIZE_SHIFT) & STEPS_1_MASK);

	/* SSC step size [24:25] */
	step_size >>= STEP_SIZE_SHIFT;
	xpsgtr_clr_set_phy(gtr_phy, L0_PLL_SS_STEP_SIZE_3_MSB,
			   STEP_SIZE_3_MASK, (step_size & STEP_SIZE_3_MASK) |
			   FORCE_STEP_SIZE | FORCE_STEPS);
}

/* Configure the lane protocol. */
static void xpsgtr_lane_set_protocol(struct xpsgtr_phy *gtr_phy)
{
	struct xpsgtr_dev *gtr_dev = gtr_phy->dev;
	u8 protocol = gtr_phy->protocol;

	switch (gtr_phy->lane) {
	case 0:
		xpsgtr_clr_set(gtr_dev, ICM_CFG0, ICM_CFG0_L0_MASK, protocol);
		break;
	case 1:
		xpsgtr_clr_set(gtr_dev, ICM_CFG0, ICM_CFG0_L1_MASK,
			       protocol << ICM_CFG_SHIFT);
		break;
	case 2:
		xpsgtr_clr_set(gtr_dev, ICM_CFG1, ICM_CFG0_L0_MASK, protocol);
		break;
	case 3:
		xpsgtr_clr_set(gtr_dev, ICM_CFG1, ICM_CFG0_L1_MASK,
			       protocol << ICM_CFG_SHIFT);
		break;
	default:
		/* We already checked 0 <= lane <= 3 */
		break;
	}
}

/* Bypass (de)scrambler and 8b/10b decoder and encoder. */
static void xpsgtr_bypass_scrambler_8b10b(struct xpsgtr_phy *gtr_phy)
{
	xpsgtr_write_phy(gtr_phy, L0_TM_DIG_6, L0_TM_DIS_DESCRAMBLE_DECODER);
	xpsgtr_write_phy(gtr_phy, L0_TX_DIG_61, L0_TM_DISABLE_SCRAMBLE_ENCODER);
}

/* DP-specific initialization. */
static void xpsgtr_phy_init_dp(struct xpsgtr_phy *gtr_phy)
{
	xpsgtr_write_phy(gtr_phy, L0_TXPMD_TM_45,
			 L0_TXPMD_TM_45_OVER_DP_MAIN |
			 L0_TXPMD_TM_45_ENABLE_DP_MAIN |
			 L0_TXPMD_TM_45_OVER_DP_POST1 |
			 L0_TXPMD_TM_45_OVER_DP_POST2 |
			 L0_TXPMD_TM_45_ENABLE_DP_POST2);
	xpsgtr_write_phy(gtr_phy, L0_TX_ANA_TM_118,
			 L0_TX_ANA_TM_118_FORCE_17_0);
}

/* SATA-specific initialization. */
static void xpsgtr_phy_init_sata(struct xpsgtr_phy *gtr_phy)
{
	struct xpsgtr_dev *gtr_dev = gtr_phy->dev;

	xpsgtr_bypass_scrambler_8b10b(gtr_phy);

	writel(gtr_phy->lane, gtr_dev->siou + SATA_CONTROL_OFFSET);
}

/* SGMII-specific initialization. */
static void xpsgtr_phy_init_sgmii(struct xpsgtr_phy *gtr_phy)
{
	struct xpsgtr_dev *gtr_dev = gtr_phy->dev;
	u32 shift = gtr_phy->lane * PROT_BUS_WIDTH_SHIFT;

	/* Set SGMII protocol TX and RX bus width to 10 bits. */
	xpsgtr_clr_set(gtr_dev, TX_PROT_BUS_WIDTH, PROT_BUS_WIDTH_MASK << shift,
		       PROT_BUS_WIDTH_10 << shift);

	xpsgtr_clr_set(gtr_dev, RX_PROT_BUS_WIDTH, PROT_BUS_WIDTH_MASK << shift,
		       PROT_BUS_WIDTH_10 << shift);

	xpsgtr_bypass_scrambler_8b10b(gtr_phy);

	/*
	 * Below code is just temporary solution till we have a way how to
	 * do it via firmware interface in sync with Linux. Till that happen
	 * this is the most sensible thing to do here.
	 */
	/* GEM I/O Clock Control */
	clrsetbits_le32(ZYNQMP_IOU_SLCR_BASEADDR + IOU_SLCR_GEM_CLK_CTRL,
			0xf << shift,
			(GEM_CTRL_GEM_SGMII_MODE | GEM_CTRL_GEM_REF_SRC_SEL) <<
			shift);

	/* Setup signal detect */
	clrsetbits_le32(ZYNQMP_IOU_SLCR_BASEADDR + IOU_SLCR_GEM_CTRL,
			PROT_BUS_WIDTH_MASK << shift,
			GEM_CTRL_GEM_SGMII_SD << shift);
}

static int xpsgtr_init(struct phy *x)
{
	struct xpsgtr_dev *gtr_dev = dev_get_priv(x->dev);
	struct xpsgtr_phy *gtr_phy;
	u32 phy_lane = x->id;

	gtr_phy = &gtr_dev->phys[phy_lane];

	/* Enable coarse code saturation limiting logic. */
	xpsgtr_write_phy(gtr_phy, L0_TM_PLL_DIG_37, L0_TM_COARSE_CODE_LIMIT);

	/*
	 * Configure the PLL, the lane protocol, and perform protocol-specific
	 * initialization.
	 */
	xpsgtr_configure_pll(gtr_phy);
	xpsgtr_lane_set_protocol(gtr_phy);

	switch (gtr_phy->protocol) {
	case ICM_PROTOCOL_SGMII:
		xpsgtr_phy_init_sgmii(gtr_phy);
		break;
	case ICM_PROTOCOL_SATA:
		xpsgtr_phy_init_sata(gtr_phy);
		break;
	case ICM_PROTOCOL_DP:
		xpsgtr_phy_init_dp(gtr_phy);
		break;
	}

	dev_dbg(gtr_dev->dev, "lane %u (type %u, protocol %u): init done\n",
		gtr_phy->lane, gtr_phy->type, gtr_phy->protocol);

	return 0;
}

/* Wait for the PLL to lock (with a timeout). */
static int xpsgtr_wait_pll_lock(struct phy *phy)
{
	struct xpsgtr_dev *gtr_dev = dev_get_priv(phy->dev);
	struct xpsgtr_phy *gtr_phy;
	u32 phy_lane = phy->id;
	int ret = 0;
	unsigned int timeout = TIMEOUT_US;

	gtr_phy = &gtr_dev->phys[phy_lane];

	dev_dbg(gtr_dev->dev, "Waiting for PLL lock\n");

	while (1) {
		u32 reg = xpsgtr_read_phy(gtr_phy, L0_PLL_STATUS_READ_1);

		if ((reg & PLL_STATUS_LOCKED) == PLL_STATUS_LOCKED) {
			ret = 0;
			break;
		}

		if (--timeout == 0) {
			ret = -ETIMEDOUT;
			break;
		}

		udelay(1);
	}

	if (ret == -ETIMEDOUT)
		dev_err(gtr_dev->dev,
			"lane %u (type %u, protocol %u): PLL lock timeout\n",
			gtr_phy->lane, gtr_phy->type, gtr_phy->protocol);

	return ret;
}

static int xpsgtr_power_on(struct phy *phy)
{
	struct xpsgtr_dev *gtr_dev = dev_get_priv(phy->dev);
	struct xpsgtr_phy *gtr_phy;
	u32 phy_lane = phy->id;
	int ret = 0;

	gtr_phy = &gtr_dev->phys[phy_lane];

	/*
	 * Wait for the PLL to lock. For DP, only wait on DP0 to avoid
	 * cumulating waits for both lanes. The user is expected to initialize
	 * lane 0 last.
	 */
	if (gtr_phy->protocol != ICM_PROTOCOL_DP ||
	    gtr_phy->type == XPSGTR_TYPE_DP_0)
		ret = xpsgtr_wait_pll_lock(phy);

	return ret;
}

/*
 * OF Xlate Support
 */

/* Set the lane type and protocol based on the PHY type and instance number. */
static int xpsgtr_set_lane_type(struct xpsgtr_phy *gtr_phy, u8 phy_type,
				unsigned int phy_instance)
{
	unsigned int num_phy_types;
	const int *phy_types;

	switch (phy_type) {
	case PHY_TYPE_SATA: {
		static const int types[] = {
			XPSGTR_TYPE_SATA_0,
			XPSGTR_TYPE_SATA_1,
		};

		phy_types = types;
		num_phy_types = ARRAY_SIZE(types);
		gtr_phy->protocol = ICM_PROTOCOL_SATA;
		break;
	}
	case PHY_TYPE_USB3: {
		static const int types[] = {
			XPSGTR_TYPE_USB0,
			XPSGTR_TYPE_USB1,
		};

		phy_types = types;
		num_phy_types = ARRAY_SIZE(types);
		gtr_phy->protocol = ICM_PROTOCOL_USB;
		break;
	}
	case PHY_TYPE_DP: {
		static const int types[] = {
			XPSGTR_TYPE_DP_0,
			XPSGTR_TYPE_DP_1,
		};

		phy_types = types;
		num_phy_types = ARRAY_SIZE(types);
		gtr_phy->protocol = ICM_PROTOCOL_DP;
		break;
	}
	case PHY_TYPE_PCIE: {
		static const int types[] = {
			XPSGTR_TYPE_PCIE_0,
			XPSGTR_TYPE_PCIE_1,
			XPSGTR_TYPE_PCIE_2,
			XPSGTR_TYPE_PCIE_3,
		};

		phy_types = types;
		num_phy_types = ARRAY_SIZE(types);
		gtr_phy->protocol = ICM_PROTOCOL_PCIE;
		break;
	}
	case PHY_TYPE_SGMII: {
		static const int types[] = {
			XPSGTR_TYPE_SGMII0,
			XPSGTR_TYPE_SGMII1,
			XPSGTR_TYPE_SGMII2,
			XPSGTR_TYPE_SGMII3,
		};

		phy_types = types;
		num_phy_types = ARRAY_SIZE(types);
		gtr_phy->protocol = ICM_PROTOCOL_SGMII;
		break;
	}
	default:
		return -EINVAL;
	}

	if (phy_instance >= num_phy_types)
		return -EINVAL;

	gtr_phy->type = phy_types[phy_instance];
	return 0;
}

/*
 * Valid combinations of controllers and lanes (Interconnect Matrix).
 */
static const unsigned int icm_matrix[NUM_LANES][CONTROLLERS_PER_LANE] = {
	{ XPSGTR_TYPE_PCIE_0, XPSGTR_TYPE_SATA_0, XPSGTR_TYPE_USB0,
		XPSGTR_TYPE_DP_1, XPSGTR_TYPE_SGMII0 },
	{ XPSGTR_TYPE_PCIE_1, XPSGTR_TYPE_SATA_1, XPSGTR_TYPE_USB0,
		XPSGTR_TYPE_DP_0, XPSGTR_TYPE_SGMII1 },
	{ XPSGTR_TYPE_PCIE_2, XPSGTR_TYPE_SATA_0, XPSGTR_TYPE_USB0,
		XPSGTR_TYPE_DP_1, XPSGTR_TYPE_SGMII2 },
	{ XPSGTR_TYPE_PCIE_3, XPSGTR_TYPE_SATA_1, XPSGTR_TYPE_USB1,
		XPSGTR_TYPE_DP_0, XPSGTR_TYPE_SGMII3 }
};

/* Translate OF phandle and args to PHY instance. */
static int xpsgtr_of_xlate(struct phy *x,
			   struct ofnode_phandle_args *args)
{
	struct xpsgtr_dev *gtr_dev = dev_get_priv(x->dev);
	struct xpsgtr_phy *gtr_phy;
	struct udevice *dev = x->dev;
	unsigned int phy_instance;
	unsigned int phy_lane;
	unsigned int phy_type;
	unsigned int refclk;
	unsigned int i;
	int ret;

	if (args->args_count != 4) {
		dev_err(dev, "Invalid number of cells in 'phy' property\n");
		return -EINVAL;
	}

	/*
	 * Get the PHY parameters from the OF arguments and derive the lane
	 * type.
	 */
	phy_lane = args->args[0];
	if (phy_lane >= NUM_LANES) {
		dev_err(dev, "Invalid lane number %u\n", phy_lane);
		return -EINVAL;
	}

	gtr_phy = &gtr_dev->phys[phy_lane];
	phy_type = args->args[1];
	phy_instance = args->args[2];

	ret = xpsgtr_set_lane_type(gtr_phy, phy_type, phy_instance);
	if (ret) {
		dev_err(dev, "Invalid PHY type and/or instance\n");
		return ret;
	}

	refclk = args->args[3];
	if (refclk >= ARRAY_SIZE(gtr_dev->refclk_sscs) ||
	    !gtr_dev->refclk_sscs[refclk]) {
		dev_err(dev, "Invalid reference clock number %u\n", refclk);
		return -EINVAL;
	}

	gtr_phy->refclk = refclk;

	/* This is difference compare to Linux */
	gtr_phy->dev = gtr_dev;
	gtr_phy->lane = phy_lane;

	/*
	 * Ensure that the Interconnect Matrix is obeyed, i.e a given lane type
	 * is allowed to operate on the lane.
	 */
	for (i = 0; i < CONTROLLERS_PER_LANE; i++) {
		if (icm_matrix[phy_lane][i] == gtr_phy->type) {
			x->id = phy_lane;
			return 0;
		}
	}

	return -EINVAL;
}

/*
 * Probe & Platform Driver
 */
static int xpsgtr_get_ref_clocks(struct udevice *dev)
{
	unsigned int refclk;
	struct xpsgtr_dev *gtr_dev = dev_get_priv(dev);
	int ret;

	for (refclk = 0; refclk < NUM_LANES; ++refclk) {
		int i;
		u32 rate;
		char name[8];
		struct clk *clk = &gtr_dev->clk[refclk];

		snprintf(name, sizeof(name), "ref%u", refclk);
		dev_dbg(dev, "Checking name: %s\n", name);
		ret = clk_get_by_name(dev, name, clk);
		if (ret == -ENODATA) {
			dev_dbg(dev, "%s clock not specified (err %d)\n",
				name, ret);
			continue;
		} else if (ret) {
			dev_dbg(dev, "couldn't get clock %s (err %d)\n",
				name, ret);
			return ret;
		}

		rate = clk_get_rate(clk);

		dev_dbg(dev, "clk rate %d\n", rate);

		ret = clk_enable(clk);
		if (ret) {
			dev_err(dev, "failed to enable refclk %d clock\n",
				refclk);
			return ret;
		}

		for (i = 0 ; i < ARRAY_SIZE(ssc_lookup); i++) {
			if (rate == ssc_lookup[i].refclk_rate) {
				gtr_dev->refclk_sscs[refclk] = &ssc_lookup[i];
				dev_dbg(dev, "Found rate %d\n", i);
				break;
			}
		}

		if (i == ARRAY_SIZE(ssc_lookup)) {
			dev_err(dev,
				"Invalid rate %u for reference clock %u\n",
				rate, refclk);
			return -EINVAL;
		}
	}

	return 0;
}

static int xpsgtr_probe(struct udevice *dev)
{
	struct xpsgtr_dev *gtr_dev = dev_get_priv(dev);

	gtr_dev->serdes = dev_remap_addr_name(dev, "serdes");
	if (!gtr_dev->serdes)
		return -EINVAL;

	gtr_dev->siou = dev_remap_addr_name(dev, "siou");
	if (!gtr_dev->siou)
		return -EINVAL;

	gtr_dev->dev = dev;

	return xpsgtr_get_ref_clocks(dev);
}

static const struct udevice_id xpsgtr_phy_ids[] = {
	{ .compatible = "xlnx,zynqmp-psgtr-v1.1", },
	{ }
};

static const struct phy_ops xpsgtr_phy_ops = {
	.init = xpsgtr_init,
	.of_xlate = xpsgtr_of_xlate,
	.power_on = xpsgtr_power_on,
};

U_BOOT_DRIVER(psgtr_phy) = {
	.name = "psgtr_phy",
	.id = UCLASS_PHY,
	.of_match = xpsgtr_phy_ids,
	.ops = &xpsgtr_phy_ops,
	.probe = xpsgtr_probe,
	.priv_auto = sizeof(struct xpsgtr_dev),
};