// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021, Intel Corporation. */

#include "ice_common.h"
#include "ice_ptp_hw.h"
#include "ice_ptp_consts.h"
#include "ice_cgu_regs.h"

/* Low level functions for interacting with and managing the device clock used
 * for the Precision Time Protocol.
 *
 * The ice hardware represents the current time using three registers:
 *
 *    GLTSYN_TIME_H     GLTSYN_TIME_L     GLTSYN_TIME_R
 *  +---------------+ +---------------+ +---------------+
 *  |    32 bits    | |    32 bits    | |    32 bits    |
 *  +---------------+ +---------------+ +---------------+
 *
 * The registers are incremented every clock tick using a 40bit increment
 * value defined over two registers:
 *
 *                     GLTSYN_INCVAL_H   GLTSYN_INCVAL_L
 *                    +---------------+ +---------------+
 *                    |    8 bit s    | |    32 bits    |
 *                    +---------------+ +---------------+
 *
 * The increment value is added to the GLSTYN_TIME_R and GLSTYN_TIME_L
 * registers every clock source tick. Depending on the specific device
 * configuration, the clock source frequency could be one of a number of
 * values.
 *
 * For E810 devices, the increment frequency is 812.5 MHz
 *
 * For E822 devices the clock can be derived from different sources, and the
 * increment has an effective frequency of one of the following:
 * - 823.4375 MHz
 * - 783.36 MHz
 * - 796.875 MHz
 * - 816 MHz
 * - 830.078125 MHz
 * - 783.36 MHz
 *
 * The hardware captures timestamps in the PHY for incoming packets, and for
 * outgoing packets on request. To support this, the PHY maintains a timer
 * that matches the lower 64 bits of the global source timer.
 *
 * In order to ensure that the PHY timers and the source timer are equivalent,
 * shadow registers are used to prepare the desired initial values. A special
 * sync command is issued to trigger copying from the shadow registers into
 * the appropriate source and PHY registers simultaneously.
 *
 * The driver supports devices which have different PHYs with subtly different
 * mechanisms to program and control the timers. We divide the devices into
 * families named after the first major device, E810 and similar devices, and
 * E822 and similar devices.
 *
 * - E822 based devices have additional support for fine grained Vernier
 *   calibration which requires significant setup
 * - The layout of timestamp data in the PHY register blocks is different
 * - The way timer synchronization commands are issued is different.
 *
 * To support this, very low level functions have an e810 or e822 suffix
 * indicating what type of device they work on. Higher level abstractions for
 * tasks that can be done on both devices do not have the suffix and will
 * correctly look up the appropriate low level function when running.
 *
 * Functions which only make sense on a single device family may not have
 * a suitable generic implementation
 */

/**
 * ice_get_ptp_src_clock_index - determine source clock index
 * @hw: pointer to HW struct
 *
 * Determine the source clock index currently in use, based on device
 * capabilities reported during initialization.
 */
u8 ice_get_ptp_src_clock_index(struct ice_hw *hw)
{
        return hw->func_caps.ts_func_info.tmr_index_assoc;
}

/**
 * ice_ptp_read_src_incval - Read source timer increment value
 * @hw: pointer to HW struct
 *
 * Read the increment value of the source timer and return it.
 */
static u64 ice_ptp_read_src_incval(struct ice_hw *hw)
{
        u32 lo, hi;
        u8 tmr_idx;

        tmr_idx = ice_get_ptp_src_clock_index(hw);

        lo = rd32(hw, GLTSYN_INCVAL_L(tmr_idx));
        hi = rd32(hw, GLTSYN_INCVAL_H(tmr_idx));

        return ((u64)(hi & INCVAL_HIGH_M) << 32) | lo;
}

/**
 * ice_ptp_src_cmd - Prepare source timer for a timer command
 * @hw: pointer to HW structure
 * @cmd: Timer command
 *
 * Prepare the source timer for an upcoming timer sync command.
 */
static void ice_ptp_src_cmd(struct ice_hw *hw, enum ice_ptp_tmr_cmd cmd)
{
        u32 cmd_val;
        u8 tmr_idx;

        tmr_idx = ice_get_ptp_src_clock_index(hw);
        cmd_val = tmr_idx << SEL_CPK_SRC;

        switch (cmd) {
        case INIT_TIME:
                cmd_val |= GLTSYN_CMD_INIT_TIME;
                break;
        case INIT_INCVAL:
                cmd_val |= GLTSYN_CMD_INIT_INCVAL;
                break;
        case ADJ_TIME:
                cmd_val |= GLTSYN_CMD_ADJ_TIME;
                break;
        case ADJ_TIME_AT_TIME:
                cmd_val |= GLTSYN_CMD_ADJ_INIT_TIME;
                break;
        case READ_TIME:
                cmd_val |= GLTSYN_CMD_READ_TIME;
                break;
        }

        wr32(hw, GLTSYN_CMD, cmd_val);
}

/**
 * ice_ptp_exec_tmr_cmd - Execute all prepared timer commands
 * @hw: pointer to HW struct
 *
 * Write the SYNC_EXEC_CMD bit to the GLTSYN_CMD_SYNC register, and flush the
 * write immediately. This triggers the hardware to begin executing all of the
 * source and PHY timer commands synchronously.
 */
static void ice_ptp_exec_tmr_cmd(struct ice_hw *hw)
{
        wr32(hw, GLTSYN_CMD_SYNC, SYNC_EXEC_CMD);
        ice_flush(hw);
}

/* E822 family functions
 *
 * The following functions operate on the E822 family of devices.
 */

/**
 * ice_fill_phy_msg_e822 - Fill message data for a PHY register access
 * @msg: the PHY message buffer to fill in
 * @port: the port to access
 * @offset: the register offset
 */
static void
ice_fill_phy_msg_e822(struct ice_sbq_msg_input *msg, u8 port, u16 offset)
{
        int phy_port, phy, quadtype;

        phy_port = port % ICE_PORTS_PER_PHY;
        phy = port / ICE_PORTS_PER_PHY;
        quadtype = (port / ICE_PORTS_PER_QUAD) % ICE_NUM_QUAD_TYPE;

        if (quadtype == 0) {
                msg->msg_addr_low = P_Q0_L(P_0_BASE + offset, phy_port);
                msg->msg_addr_high = P_Q0_H(P_0_BASE + offset, phy_port);
        } else {
                msg->msg_addr_low = P_Q1_L(P_4_BASE + offset, phy_port);
                msg->msg_addr_high = P_Q1_H(P_4_BASE + offset, phy_port);
        }

        if (phy == 0)
                msg->dest_dev = rmn_0;
        else if (phy == 1)
                msg->dest_dev = rmn_1;
        else
                msg->dest_dev = rmn_2;
}

/**
 * ice_is_64b_phy_reg_e822 - Check if this is a 64bit PHY register
 * @low_addr: the low address to check
 * @high_addr: on return, contains the high address of the 64bit register
 *
 * Checks if the provided low address is one of the known 64bit PHY values
 * represented as two 32bit registers. If it is, return the appropriate high
 * register offset to use.
 */
static bool ice_is_64b_phy_reg_e822(u16 low_addr, u16 *high_addr)
{
        switch (low_addr) {
        case P_REG_PAR_PCS_TX_OFFSET_L:
                *high_addr = P_REG_PAR_PCS_TX_OFFSET_U;
                return true;
        case P_REG_PAR_PCS_RX_OFFSET_L:
                *high_addr = P_REG_PAR_PCS_RX_OFFSET_U;
                return true;
        case P_REG_PAR_TX_TIME_L:
                *high_addr = P_REG_PAR_TX_TIME_U;
                return true;
        case P_REG_PAR_RX_TIME_L:
                *high_addr = P_REG_PAR_RX_TIME_U;
                return true;
        case P_REG_TOTAL_TX_OFFSET_L:
                *high_addr = P_REG_TOTAL_TX_OFFSET_U;
                return true;
        case P_REG_TOTAL_RX_OFFSET_L:
                *high_addr = P_REG_TOTAL_RX_OFFSET_U;
                return true;
        case P_REG_UIX66_10G_40G_L:
                *high_addr = P_REG_UIX66_10G_40G_U;
                return true;
        case P_REG_UIX66_25G_100G_L:
                *high_addr = P_REG_UIX66_25G_100G_U;
                return true;
        case P_REG_TX_CAPTURE_L:
                *high_addr = P_REG_TX_CAPTURE_U;
                return true;
        case P_REG_RX_CAPTURE_L:
                *high_addr = P_REG_RX_CAPTURE_U;
                return true;
        case P_REG_TX_TIMER_INC_PRE_L:
                *high_addr = P_REG_TX_TIMER_INC_PRE_U;
                return true;
        case P_REG_RX_TIMER_INC_PRE_L:
                *high_addr = P_REG_RX_TIMER_INC_PRE_U;
                return true;
        default:
                return false;
        }
}

/**
 * ice_is_40b_phy_reg_e822 - Check if this is a 40bit PHY register
 * @low_addr: the low address to check
 * @high_addr: on return, contains the high address of the 40bit value
 *
 * Checks if the provided low address is one of the known 40bit PHY values
 * split into two registers with the lower 8 bits in the low register and the
 * upper 32 bits in the high register. If it is, return the appropriate high
 * register offset to use.
 */
static bool ice_is_40b_phy_reg_e822(u16 low_addr, u16 *high_addr)
{
        switch (low_addr) {
        case P_REG_TIMETUS_L:
                *high_addr = P_REG_TIMETUS_U;
                return true;
        case P_REG_PAR_RX_TUS_L:
                *high_addr = P_REG_PAR_RX_TUS_U;
                return true;
        case P_REG_PAR_TX_TUS_L:
                *high_addr = P_REG_PAR_TX_TUS_U;
                return true;
        case P_REG_PCS_RX_TUS_L:
                *high_addr = P_REG_PCS_RX_TUS_U;
                return true;
        case P_REG_PCS_TX_TUS_L:
                *high_addr = P_REG_PCS_TX_TUS_U;
                return true;
        case P_REG_DESK_PAR_RX_TUS_L:
                *high_addr = P_REG_DESK_PAR_RX_TUS_U;
                return true;
        case P_REG_DESK_PAR_TX_TUS_L:
                *high_addr = P_REG_DESK_PAR_TX_TUS_U;
                return true;
        case P_REG_DESK_PCS_RX_TUS_L:
                *high_addr = P_REG_DESK_PCS_RX_TUS_U;
                return true;
        case P_REG_DESK_PCS_TX_TUS_L:
                *high_addr = P_REG_DESK_PCS_TX_TUS_U;
                return true;
        default:
                return false;
        }
}

/**
 * ice_read_phy_reg_e822 - Read a PHY register
 * @hw: pointer to the HW struct
 * @port: PHY port to read from
 * @offset: PHY register offset to read
 * @val: on return, the contents read from the PHY
 *
 * Read a PHY register for the given port over the device sideband queue.
 */
int
ice_read_phy_reg_e822(struct ice_hw *hw, u8 port, u16 offset, u32 *val)
{
        struct ice_sbq_msg_input msg = {0};
        int err;

        ice_fill_phy_msg_e822(&msg, port, offset);
        msg.opcode = ice_sbq_msg_rd;

        err = ice_sbq_rw_reg(hw, &msg);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to send message to PHY, err %d\n",
                          err);
                return err;
        }

        *val = msg.data;

        return 0;
}

/**
 * ice_read_64b_phy_reg_e822 - Read a 64bit value from PHY registers
 * @hw: pointer to the HW struct
 * @port: PHY port to read from
 * @low_addr: offset of the lower register to read from
 * @val: on return, the contents of the 64bit value from the PHY registers
 *
 * Reads the two registers associated with a 64bit value and returns it in the
 * val pointer. The offset always specifies the lower register offset to use.
 * The high offset is looked up. This function only operates on registers
 * known to be two parts of a 64bit value.
 */
static int
ice_read_64b_phy_reg_e822(struct ice_hw *hw, u8 port, u16 low_addr, u64 *val)
{
        u32 low, high;
        u16 high_addr;
        int err;

        /* Only operate on registers known to be split into two 32bit
         * registers.
         */
        if (!ice_is_64b_phy_reg_e822(low_addr, &high_addr)) {
                ice_debug(hw, ICE_DBG_PTP, "Invalid 64b register addr 0x%08x\n",
                          low_addr);
                return -EINVAL;
        }

        err = ice_read_phy_reg_e822(hw, port, low_addr, &low);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read from low register 0x%08x\n, err %d",
                          low_addr, err);
                return err;
        }

        err = ice_read_phy_reg_e822(hw, port, high_addr, &high);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read from high register 0x%08x\n, err %d",
                          high_addr, err);
                return err;
        }

        *val = (u64)high << 32 | low;

        return 0;
}

/**
 * ice_write_phy_reg_e822 - Write a PHY register
 * @hw: pointer to the HW struct
 * @port: PHY port to write to
 * @offset: PHY register offset to write
 * @val: The value to write to the register
 *
 * Write a PHY register for the given port over the device sideband queue.
 */
int
ice_write_phy_reg_e822(struct ice_hw *hw, u8 port, u16 offset, u32 val)
{
        struct ice_sbq_msg_input msg = {0};
        int err;

        ice_fill_phy_msg_e822(&msg, port, offset);
        msg.opcode = ice_sbq_msg_wr;
        msg.data = val;

        err = ice_sbq_rw_reg(hw, &msg);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to send message to PHY, err %d\n",
                          err);
                return err;
        }

        return 0;
}

/**
 * ice_write_40b_phy_reg_e822 - Write a 40b value to the PHY
 * @hw: pointer to the HW struct
 * @port: port to write to
 * @low_addr: offset of the low register
 * @val: 40b value to write
 *
 * Write the provided 40b value to the two associated registers by splitting
 * it up into two chunks, the lower 8 bits and the upper 32 bits.
 */
static int
ice_write_40b_phy_reg_e822(struct ice_hw *hw, u8 port, u16 low_addr, u64 val)
{
        u32 low, high;
        u16 high_addr;
        int err;

        /* Only operate on registers known to be split into a lower 8 bit
         * register and an upper 32 bit register.
         */
        if (!ice_is_40b_phy_reg_e822(low_addr, &high_addr)) {
                ice_debug(hw, ICE_DBG_PTP, "Invalid 40b register addr 0x%08x\n",
                          low_addr);
                return -EINVAL;
        }

        low = (u32)(val & P_REG_40B_LOW_M);
        high = (u32)(val >> P_REG_40B_HIGH_S);

        err = ice_write_phy_reg_e822(hw, port, low_addr, low);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write to low register 0x%08x\n, err %d",
                          low_addr, err);
                return err;
        }

        err = ice_write_phy_reg_e822(hw, port, high_addr, high);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write to high register 0x%08x\n, err %d",
                          high_addr, err);
                return err;
        }

        return 0;
}

/**
 * ice_write_64b_phy_reg_e822 - Write a 64bit value to PHY registers
 * @hw: pointer to the HW struct
 * @port: PHY port to read from
 * @low_addr: offset of the lower register to read from
 * @val: the contents of the 64bit value to write to PHY
 *
 * Write the 64bit value to the two associated 32bit PHY registers. The offset
 * is always specified as the lower register, and the high address is looked
 * up. This function only operates on registers known to be two parts of
 * a 64bit value.
 */
static int
ice_write_64b_phy_reg_e822(struct ice_hw *hw, u8 port, u16 low_addr, u64 val)
{
        u32 low, high;
        u16 high_addr;
        int err;

        /* Only operate on registers known to be split into two 32bit
         * registers.
         */
        if (!ice_is_64b_phy_reg_e822(low_addr, &high_addr)) {
                ice_debug(hw, ICE_DBG_PTP, "Invalid 64b register addr 0x%08x\n",
                          low_addr);
                return -EINVAL;
        }

        low = lower_32_bits(val);
        high = upper_32_bits(val);

        err = ice_write_phy_reg_e822(hw, port, low_addr, low);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write to low register 0x%08x\n, err %d",
                          low_addr, err);
                return err;
        }

        err = ice_write_phy_reg_e822(hw, port, high_addr, high);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write to high register 0x%08x\n, err %d",
                          high_addr, err);
                return err;
        }

        return 0;
}

/**
 * ice_fill_quad_msg_e822 - Fill message data for quad register access
 * @msg: the PHY message buffer to fill in
 * @quad: the quad to access
 * @offset: the register offset
 *
 * Fill a message buffer for accessing a register in a quad shared between
 * multiple PHYs.
 */
static void
ice_fill_quad_msg_e822(struct ice_sbq_msg_input *msg, u8 quad, u16 offset)
{
        u32 addr;

        msg->dest_dev = rmn_0;

        if ((quad % ICE_NUM_QUAD_TYPE) == 0)
                addr = Q_0_BASE + offset;
        else
                addr = Q_1_BASE + offset;

        msg->msg_addr_low = lower_16_bits(addr);
        msg->msg_addr_high = upper_16_bits(addr);
}

/**
 * ice_read_quad_reg_e822 - Read a PHY quad register
 * @hw: pointer to the HW struct
 * @quad: quad to read from
 * @offset: quad register offset to read
 * @val: on return, the contents read from the quad
 *
 * Read a quad register over the device sideband queue. Quad registers are
 * shared between multiple PHYs.
 */
int
ice_read_quad_reg_e822(struct ice_hw *hw, u8 quad, u16 offset, u32 *val)
{
        struct ice_sbq_msg_input msg = {0};
        int err;

        if (quad >= ICE_MAX_QUAD)
                return -EINVAL;

        ice_fill_quad_msg_e822(&msg, quad, offset);
        msg.opcode = ice_sbq_msg_rd;

        err = ice_sbq_rw_reg(hw, &msg);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to send message to PHY, err %d\n",
                          err);
                return err;
        }

        *val = msg.data;

        return 0;
}

/**
 * ice_write_quad_reg_e822 - Write a PHY quad register
 * @hw: pointer to the HW struct
 * @quad: quad to write to
 * @offset: quad register offset to write
 * @val: The value to write to the register
 *
 * Write a quad register over the device sideband queue. Quad registers are
 * shared between multiple PHYs.
 */
int
ice_write_quad_reg_e822(struct ice_hw *hw, u8 quad, u16 offset, u32 val)
{
        struct ice_sbq_msg_input msg = {0};
        int err;

        if (quad >= ICE_MAX_QUAD)
                return -EINVAL;

        ice_fill_quad_msg_e822(&msg, quad, offset);
        msg.opcode = ice_sbq_msg_wr;
        msg.data = val;

        err = ice_sbq_rw_reg(hw, &msg);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to send message to PHY, err %d\n",
                          err);
                return err;
        }

        return 0;
}

/**
 * ice_read_phy_tstamp_e822 - Read a PHY timestamp out of the quad block
 * @hw: pointer to the HW struct
 * @quad: the quad to read from
 * @idx: the timestamp index to read
 * @tstamp: on return, the 40bit timestamp value
 *
 * Read a 40bit timestamp value out of the two associated registers in the
 * quad memory block that is shared between the internal PHYs of the E822
 * family of devices.
 */
static int
ice_read_phy_tstamp_e822(struct ice_hw *hw, u8 quad, u8 idx, u64 *tstamp)
{
        u16 lo_addr, hi_addr;
        u32 lo, hi;
        int err;

        lo_addr = (u16)TS_L(Q_REG_TX_MEMORY_BANK_START, idx);
        hi_addr = (u16)TS_H(Q_REG_TX_MEMORY_BANK_START, idx);

        err = ice_read_quad_reg_e822(hw, quad, lo_addr, &lo);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read low PTP timestamp register, err %d\n",
                          err);
                return err;
        }

        err = ice_read_quad_reg_e822(hw, quad, hi_addr, &hi);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read high PTP timestamp register, err %d\n",
                          err);
                return err;
        }

        /* For E822 based internal PHYs, the timestamp is reported with the
         * lower 8 bits in the low register, and the upper 32 bits in the high
         * register.
         */
        *tstamp = ((u64)hi) << TS_PHY_HIGH_S | ((u64)lo & TS_PHY_LOW_M);

        return 0;
}

/**
 * ice_clear_phy_tstamp_e822 - Clear a timestamp from the quad block
 * @hw: pointer to the HW struct
 * @quad: the quad to read from
 * @idx: the timestamp index to reset
 *
 * Clear a timestamp, resetting its valid bit, from the PHY quad block that is
 * shared between the internal PHYs on the E822 devices.
 */
static int
ice_clear_phy_tstamp_e822(struct ice_hw *hw, u8 quad, u8 idx)
{
        u16 lo_addr, hi_addr;
        int err;

        lo_addr = (u16)TS_L(Q_REG_TX_MEMORY_BANK_START, idx);
        hi_addr = (u16)TS_H(Q_REG_TX_MEMORY_BANK_START, idx);

        err = ice_write_quad_reg_e822(hw, quad, lo_addr, 0);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to clear low PTP timestamp register, err %d\n",
                          err);
                return err;
        }

        err = ice_write_quad_reg_e822(hw, quad, hi_addr, 0);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to clear high PTP timestamp register, err %d\n",
                          err);
                return err;
        }

        return 0;
}

/**
 * ice_read_cgu_reg_e822 - Read a CGU register
 * @hw: pointer to the HW struct
 * @addr: Register address to read
 * @val: storage for register value read
 *
 * Read the contents of a register of the Clock Generation Unit. Only
 * applicable to E822 devices.
 */
static int
ice_read_cgu_reg_e822(struct ice_hw *hw, u32 addr, u32 *val)
{
        struct ice_sbq_msg_input cgu_msg;
        int err;

        cgu_msg.opcode = ice_sbq_msg_rd;
        cgu_msg.dest_dev = cgu;
        cgu_msg.msg_addr_low = addr;
        cgu_msg.msg_addr_high = 0x0;

        err = ice_sbq_rw_reg(hw, &cgu_msg);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read CGU register 0x%04x, err %d\n",
                          addr, err);
                return err;
        }

        *val = cgu_msg.data;

        return err;
}

/**
 * ice_write_cgu_reg_e822 - Write a CGU register
 * @hw: pointer to the HW struct
 * @addr: Register address to write
 * @val: value to write into the register
 *
 * Write the specified value to a register of the Clock Generation Unit. Only
 * applicable to E822 devices.
 */
static int
ice_write_cgu_reg_e822(struct ice_hw *hw, u32 addr, u32 val)
{
        struct ice_sbq_msg_input cgu_msg;
        int err;

        cgu_msg.opcode = ice_sbq_msg_wr;
        cgu_msg.dest_dev = cgu;
        cgu_msg.msg_addr_low = addr;
        cgu_msg.msg_addr_high = 0x0;
        cgu_msg.data = val;

        err = ice_sbq_rw_reg(hw, &cgu_msg);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write CGU register 0x%04x, err %d\n",
                          addr, err);
                return err;
        }

        return err;
}

/**
 * ice_clk_freq_str - Convert time_ref_freq to string
 * @clk_freq: Clock frequency
 *
 * Convert the specified TIME_REF clock frequency to a string.
 */
static const char *ice_clk_freq_str(u8 clk_freq)
{
        switch ((enum ice_time_ref_freq)clk_freq) {
        case ICE_TIME_REF_FREQ_25_000:
                return "25 MHz";
        case ICE_TIME_REF_FREQ_122_880:
                return "122.88 MHz";
        case ICE_TIME_REF_FREQ_125_000:
                return "125 MHz";
        case ICE_TIME_REF_FREQ_153_600:
                return "153.6 MHz";
        case ICE_TIME_REF_FREQ_156_250:
                return "156.25 MHz";
        case ICE_TIME_REF_FREQ_245_760:
                return "245.76 MHz";
        default:
                return "Unknown";
        }
}

/**
 * ice_clk_src_str - Convert time_ref_src to string
 * @clk_src: Clock source
 *
 * Convert the specified clock source to its string name.
 */
static const char *ice_clk_src_str(u8 clk_src)
{
        switch ((enum ice_clk_src)clk_src) {
        case ICE_CLK_SRC_TCX0:
                return "TCX0";
        case ICE_CLK_SRC_TIME_REF:
                return "TIME_REF";
        default:
                return "Unknown";
        }
}

/**
 * ice_cfg_cgu_pll_e822 - Configure the Clock Generation Unit
 * @hw: pointer to the HW struct
 * @clk_freq: Clock frequency to program
 * @clk_src: Clock source to select (TIME_REF, or TCX0)
 *
 * Configure the Clock Generation Unit with the desired clock frequency and
 * time reference, enabling the PLL which drives the PTP hardware clock.
 */
static int
ice_cfg_cgu_pll_e822(struct ice_hw *hw, enum ice_time_ref_freq clk_freq,
                     enum ice_clk_src clk_src)
{
        union tspll_ro_bwm_lf bwm_lf;
        union nac_cgu_dword19 dw19;
        union nac_cgu_dword22 dw22;
        union nac_cgu_dword24 dw24;
        union nac_cgu_dword9 dw9;
        int err;

        if (clk_freq >= NUM_ICE_TIME_REF_FREQ) {
                dev_warn(ice_hw_to_dev(hw), "Invalid TIME_REF frequency %u\n",
                         clk_freq);
                return -EINVAL;
        }

        if (clk_src >= NUM_ICE_CLK_SRC) {
                dev_warn(ice_hw_to_dev(hw), "Invalid clock source %u\n",
                         clk_src);
                return -EINVAL;
        }

        if (clk_src == ICE_CLK_SRC_TCX0 &&
            clk_freq != ICE_TIME_REF_FREQ_25_000) {
                dev_warn(ice_hw_to_dev(hw),
                         "TCX0 only supports 25 MHz frequency\n");
                return -EINVAL;
        }

        err = ice_read_cgu_reg_e822(hw, NAC_CGU_DWORD9, &dw9.val);
        if (err)
                return err;

        err = ice_read_cgu_reg_e822(hw, NAC_CGU_DWORD24, &dw24.val);
        if (err)
                return err;

        err = ice_read_cgu_reg_e822(hw, TSPLL_RO_BWM_LF, &bwm_lf.val);
        if (err)
                return err;

        /* Log the current clock configuration */
        ice_debug(hw, ICE_DBG_PTP, "Current CGU configuration -- %s, clk_src %s, clk_freq %s, PLL %s\n",
                  dw24.field.ts_pll_enable ? "enabled" : "disabled",
                  ice_clk_src_str(dw24.field.time_ref_sel),
                  ice_clk_freq_str(dw9.field.time_ref_freq_sel),
                  bwm_lf.field.plllock_true_lock_cri ? "locked" : "unlocked");

        /* Disable the PLL before changing the clock source or frequency */
        if (dw24.field.ts_pll_enable) {
                dw24.field.ts_pll_enable = 0;

                err = ice_write_cgu_reg_e822(hw, NAC_CGU_DWORD24, dw24.val);
                if (err)
                        return err;
        }

        /* Set the frequency */
        dw9.field.time_ref_freq_sel = clk_freq;
        err = ice_write_cgu_reg_e822(hw, NAC_CGU_DWORD9, dw9.val);
        if (err)
                return err;

        /* Configure the TS PLL feedback divisor */
        err = ice_read_cgu_reg_e822(hw, NAC_CGU_DWORD19, &dw19.val);
        if (err)
                return err;

        dw19.field.tspll_fbdiv_intgr = e822_cgu_params[clk_freq].feedback_div;
        dw19.field.tspll_ndivratio = 1;

        err = ice_write_cgu_reg_e822(hw, NAC_CGU_DWORD19, dw19.val);
        if (err)
                return err;

        /* Configure the TS PLL post divisor */
        err = ice_read_cgu_reg_e822(hw, NAC_CGU_DWORD22, &dw22.val);
        if (err)
                return err;

        dw22.field.time1588clk_div = e822_cgu_params[clk_freq].post_pll_div;
        dw22.field.time1588clk_sel_div2 = 0;

        err = ice_write_cgu_reg_e822(hw, NAC_CGU_DWORD22, dw22.val);
        if (err)
                return err;

        /* Configure the TS PLL pre divisor and clock source */
        err = ice_read_cgu_reg_e822(hw, NAC_CGU_DWORD24, &dw24.val);
        if (err)
                return err;

        dw24.field.ref1588_ck_div = e822_cgu_params[clk_freq].refclk_pre_div;
        dw24.field.tspll_fbdiv_frac = e822_cgu_params[clk_freq].frac_n_div;
        dw24.field.time_ref_sel = clk_src;

        err = ice_write_cgu_reg_e822(hw, NAC_CGU_DWORD24, dw24.val);
        if (err)
                return err;

        /* Finally, enable the PLL */
        dw24.field.ts_pll_enable = 1;

        err = ice_write_cgu_reg_e822(hw, NAC_CGU_DWORD24, dw24.val);
        if (err)
                return err;

        /* Wait to verify if the PLL locks */
        usleep_range(1000, 5000);

        err = ice_read_cgu_reg_e822(hw, TSPLL_RO_BWM_LF, &bwm_lf.val);
        if (err)
                return err;

        if (!bwm_lf.field.plllock_true_lock_cri) {
                dev_warn(ice_hw_to_dev(hw), "CGU PLL failed to lock\n");
                return -EBUSY;
        }

        /* Log the current clock configuration */
        ice_debug(hw, ICE_DBG_PTP, "New CGU configuration -- %s, clk_src %s, clk_freq %s, PLL %s\n",
                  dw24.field.ts_pll_enable ? "enabled" : "disabled",
                  ice_clk_src_str(dw24.field.time_ref_sel),
                  ice_clk_freq_str(dw9.field.time_ref_freq_sel),
                  bwm_lf.field.plllock_true_lock_cri ? "locked" : "unlocked");

        return 0;
}

/**
 * ice_init_cgu_e822 - Initialize CGU with settings from firmware
 * @hw: pointer to the HW structure
 *
 * Initialize the Clock Generation Unit of the E822 device.
 */
static int ice_init_cgu_e822(struct ice_hw *hw)
{
        struct ice_ts_func_info *ts_info = &hw->func_caps.ts_func_info;
        union tspll_cntr_bist_settings cntr_bist;
        int err;

        err = ice_read_cgu_reg_e822(hw, TSPLL_CNTR_BIST_SETTINGS,
                                    &cntr_bist.val);
        if (err)
                return err;

        /* Disable sticky lock detection so lock err reported is accurate */
        cntr_bist.field.i_plllock_sel_0 = 0;
        cntr_bist.field.i_plllock_sel_1 = 0;

        err = ice_write_cgu_reg_e822(hw, TSPLL_CNTR_BIST_SETTINGS,
                                     cntr_bist.val);
        if (err)
                return err;

        /* Configure the CGU PLL using the parameters from the function
         * capabilities.
         */
        err = ice_cfg_cgu_pll_e822(hw, ts_info->time_ref,
                                   (enum ice_clk_src)ts_info->clk_src);
        if (err)
                return err;

        return 0;
}

/**
 * ice_ptp_set_vernier_wl - Set the window length for vernier calibration
 * @hw: pointer to the HW struct
 *
 * Set the window length used for the vernier port calibration process.
 */
static int ice_ptp_set_vernier_wl(struct ice_hw *hw)
{
        u8 port;

        for (port = 0; port < ICE_NUM_EXTERNAL_PORTS; port++) {
                int err;

                err = ice_write_phy_reg_e822(hw, port, P_REG_WL,
                                             PTP_VERNIER_WL);
                if (err) {
                        ice_debug(hw, ICE_DBG_PTP, "Failed to set vernier window length for port %u, err %d\n",
                                  port, err);
                        return err;
                }
        }

        return 0;
}

/**
 * ice_ptp_init_phc_e822 - Perform E822 specific PHC initialization
 * @hw: pointer to HW struct
 *
 * Perform PHC initialization steps specific to E822 devices.
 */
static int ice_ptp_init_phc_e822(struct ice_hw *hw)
{
        int err;
        u32 regval;

        /* Enable reading switch and PHY registers over the sideband queue */
#define PF_SB_REM_DEV_CTL_SWITCH_READ BIT(1)
#define PF_SB_REM_DEV_CTL_PHY0 BIT(2)
        regval = rd32(hw, PF_SB_REM_DEV_CTL);
        regval |= (PF_SB_REM_DEV_CTL_SWITCH_READ |
                   PF_SB_REM_DEV_CTL_PHY0);
        wr32(hw, PF_SB_REM_DEV_CTL, regval);

        /* Initialize the Clock Generation Unit */
        err = ice_init_cgu_e822(hw);
        if (err)
                return err;

        /* Set window length for all the ports */
        return ice_ptp_set_vernier_wl(hw);
}

/**
 * ice_ptp_prep_phy_time_e822 - Prepare PHY port with initial time
 * @hw: pointer to the HW struct
 * @time: Time to initialize the PHY port clocks to
 *
 * Program the PHY port registers with a new initial time value. The port
 * clock will be initialized once the driver issues an INIT_TIME sync
 * command. The time value is the upper 32 bits of the PHY timer, usually in

 * units of nominal nanoseconds.
 */
static int
ice_ptp_prep_phy_time_e822(struct ice_hw *hw, u32 time)
{
        u64 phy_time;
        u8 port;
        int err;

        /* The time represents the upper 32 bits of the PHY timer, so we need
         * to shift to account for this when programming.
         */
        phy_time = (u64)time << 32;

        for (port = 0; port < ICE_NUM_EXTERNAL_PORTS; port++) {
                /* Tx case */
                err = ice_write_64b_phy_reg_e822(hw, port,
                                                 P_REG_TX_TIMER_INC_PRE_L,
                                                 phy_time);
                if (err)
                        goto exit_err;

                /* Rx case */
                err = ice_write_64b_phy_reg_e822(hw, port,
                                                 P_REG_RX_TIMER_INC_PRE_L,
                                                 phy_time);
                if (err)
                        goto exit_err;
        }

        return 0;

exit_err:
        ice_debug(hw, ICE_DBG_PTP, "Failed to write init time for port %u, err %d\n",
                  port, err);

        return err;
}

/**
 * ice_ptp_prep_port_adj_e822 - Prepare a single port for time adjust
 * @hw: pointer to HW struct
 * @port: Port number to be programmed
 * @time: time in cycles to adjust the port Tx and Rx clocks
 *
 * Program the port for an atomic adjustment by writing the Tx and Rx timer
 * registers. The atomic adjustment won't be completed until the driver issues
 * an ADJ_TIME command.
 *
 * Note that time is not in units of nanoseconds. It is in clock time
 * including the lower sub-nanosecond portion of the port timer.
 *
 * Negative adjustments are supported using 2s complement arithmetic.
 */
int
ice_ptp_prep_port_adj_e822(struct ice_hw *hw, u8 port, s64 time)
{
        u32 l_time, u_time;
        int err;

        l_time = lower_32_bits(time);
        u_time = upper_32_bits(time);

        /* Tx case */
        err = ice_write_phy_reg_e822(hw, port, P_REG_TX_TIMER_INC_PRE_L,
                                     l_time);
        if (err)
                goto exit_err;

        err = ice_write_phy_reg_e822(hw, port, P_REG_TX_TIMER_INC_PRE_U,
                                     u_time);
        if (err)
                goto exit_err;

        /* Rx case */
        err = ice_write_phy_reg_e822(hw, port, P_REG_RX_TIMER_INC_PRE_L,
                                     l_time);
        if (err)
                goto exit_err;

        err = ice_write_phy_reg_e822(hw, port, P_REG_RX_TIMER_INC_PRE_U,
                                     u_time);
        if (err)
                goto exit_err;

        return 0;

exit_err:
        ice_debug(hw, ICE_DBG_PTP, "Failed to write time adjust for port %u, err %d\n",
                  port, err);
        return err;
}

/**
 * ice_ptp_prep_phy_adj_e822 - Prep PHY ports for a time adjustment
 * @hw: pointer to HW struct
 * @adj: adjustment in nanoseconds
 *
 * Prepare the PHY ports for an atomic time adjustment by programming the PHY
 * Tx and Rx port registers. The actual adjustment is completed by issuing an
 * ADJ_TIME or ADJ_TIME_AT_TIME sync command.
 */
static int
ice_ptp_prep_phy_adj_e822(struct ice_hw *hw, s32 adj)
{
        s64 cycles;
        u8 port;

        /* The port clock supports adjustment of the sub-nanosecond portion of
         * the clock. We shift the provided adjustment in nanoseconds to
         * calculate the appropriate adjustment to program into the PHY ports.
         */
        if (adj > 0)
                cycles = (s64)adj << 32;
        else
                cycles = -(((s64)-adj) << 32);

        for (port = 0; port < ICE_NUM_EXTERNAL_PORTS; port++) {
                int err;

                err = ice_ptp_prep_port_adj_e822(hw, port, cycles);
                if (err)
                        return err;
        }

        return 0;
}

/**
 * ice_ptp_prep_phy_incval_e822 - Prepare PHY ports for time adjustment
 * @hw: pointer to HW struct
 * @incval: new increment value to prepare
 *
 * Prepare each of the PHY ports for a new increment value by programming the
 * port's TIMETUS registers. The new increment value will be updated after
 * issuing an INIT_INCVAL command.
 */
static int
ice_ptp_prep_phy_incval_e822(struct ice_hw *hw, u64 incval)
{
        int err;
        u8 port;

        for (port = 0; port < ICE_NUM_EXTERNAL_PORTS; port++) {
                err = ice_write_40b_phy_reg_e822(hw, port, P_REG_TIMETUS_L,
                                                 incval);
                if (err)
                        goto exit_err;
        }

        return 0;

exit_err:
        ice_debug(hw, ICE_DBG_PTP, "Failed to write incval for port %u, err %d\n",
                  port, err);

        return err;
}

/**
 * ice_ptp_read_port_capture - Read a port's local time capture
 * @hw: pointer to HW struct
 * @port: Port number to read
 * @tx_ts: on return, the Tx port time capture
 * @rx_ts: on return, the Rx port time capture
 *
 * Read the port's Tx and Rx local time capture values.
 *
 * Note this has no equivalent for the E810 devices.
 */
static int
ice_ptp_read_port_capture(struct ice_hw *hw, u8 port, u64 *tx_ts, u64 *rx_ts)
{
        int err;

        /* Tx case */
        err = ice_read_64b_phy_reg_e822(hw, port, P_REG_TX_CAPTURE_L, tx_ts);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read REG_TX_CAPTURE, err %d\n",
                          err);
                return err;
        }

        ice_debug(hw, ICE_DBG_PTP, "tx_init = 0x%016llx\n",
                  (unsigned long long)*tx_ts);

        /* Rx case */
        err = ice_read_64b_phy_reg_e822(hw, port, P_REG_RX_CAPTURE_L, rx_ts);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read RX_CAPTURE, err %d\n",
                          err);
                return err;
        }

        ice_debug(hw, ICE_DBG_PTP, "rx_init = 0x%016llx\n",
                  (unsigned long long)*rx_ts);

        return 0;
}

/**
 * ice_ptp_one_port_cmd - Prepare a single PHY port for a timer command
 * @hw: pointer to HW struct
 * @port: Port to which cmd has to be sent
 * @cmd: Command to be sent to the port
 *
 * Prepare the requested port for an upcoming timer sync command.
 *
 * Note there is no equivalent of this operation on E810, as that device
 * always handles all external PHYs internally.
 */
static int
ice_ptp_one_port_cmd(struct ice_hw *hw, u8 port, enum ice_ptp_tmr_cmd cmd)
{
        u32 cmd_val, val;
        u8 tmr_idx;
        int err;

        tmr_idx = ice_get_ptp_src_clock_index(hw);
        cmd_val = tmr_idx << SEL_PHY_SRC;
        switch (cmd) {
        case INIT_TIME:
                cmd_val |= PHY_CMD_INIT_TIME;
                break;
        case INIT_INCVAL:
                cmd_val |= PHY_CMD_INIT_INCVAL;
                break;
        case ADJ_TIME:
                cmd_val |= PHY_CMD_ADJ_TIME;
                break;
        case READ_TIME:
                cmd_val |= PHY_CMD_READ_TIME;
                break;
        case ADJ_TIME_AT_TIME:
                cmd_val |= PHY_CMD_ADJ_TIME_AT_TIME;
                break;
        }

        /* Tx case */
        /* Read, modify, write */
        err = ice_read_phy_reg_e822(hw, port, P_REG_TX_TMR_CMD, &val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read TX_TMR_CMD, err %d\n",
                          err);
                return err;
        }

        /* Modify necessary bits only and perform write */
        val &= ~TS_CMD_MASK;
        val |= cmd_val;

        err = ice_write_phy_reg_e822(hw, port, P_REG_TX_TMR_CMD, val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write back TX_TMR_CMD, err %d\n",
                          err);
                return err;
        }

        /* Rx case */
        /* Read, modify, write */
        err = ice_read_phy_reg_e822(hw, port, P_REG_RX_TMR_CMD, &val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read RX_TMR_CMD, err %d\n",
                          err);
                return err;
        }

        /* Modify necessary bits only and perform write */
        val &= ~TS_CMD_MASK;
        val |= cmd_val;

        err = ice_write_phy_reg_e822(hw, port, P_REG_RX_TMR_CMD, val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write back RX_TMR_CMD, err %d\n",
                          err);
                return err;
        }

        return 0;
}

/**
 * ice_ptp_port_cmd_e822 - Prepare all ports for a timer command
 * @hw: pointer to the HW struct
 * @cmd: timer command to prepare
 *
 * Prepare all ports connected to this device for an upcoming timer sync
 * command.
 */
static int
ice_ptp_port_cmd_e822(struct ice_hw *hw, enum ice_ptp_tmr_cmd cmd)
{
        u8 port;

        for (port = 0; port < ICE_NUM_EXTERNAL_PORTS; port++) {
                int err;

                err = ice_ptp_one_port_cmd(hw, port, cmd);
                if (err)
                        return err;
        }

        return 0;
}

/* E822 Vernier calibration functions
 *
 * The following functions are used as part of the vernier calibration of
 * a port. This calibration increases the precision of the timestamps on the
 * port.
 */

/**
 * ice_phy_get_speed_and_fec_e822 - Get link speed and FEC based on serdes mode
 * @hw: pointer to HW struct
 * @port: the port to read from
 * @link_out: if non-NULL, holds link speed on success
 * @fec_out: if non-NULL, holds FEC algorithm on success
 *
 * Read the serdes data for the PHY port and extract the link speed and FEC
 * algorithm.
 */
static int
ice_phy_get_speed_and_fec_e822(struct ice_hw *hw, u8 port,
                               enum ice_ptp_link_spd *link_out,
                               enum ice_ptp_fec_mode *fec_out)
{
        enum ice_ptp_link_spd link;
        enum ice_ptp_fec_mode fec;
        u32 serdes;
        int err;

        err = ice_read_phy_reg_e822(hw, port, P_REG_LINK_SPEED, &serdes);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read serdes info\n");
                return err;
        }

        /* Determine the FEC algorithm */
        fec = (enum ice_ptp_fec_mode)P_REG_LINK_SPEED_FEC_MODE(serdes);

        serdes &= P_REG_LINK_SPEED_SERDES_M;

        /* Determine the link speed */
        if (fec == ICE_PTP_FEC_MODE_RS_FEC) {
                switch (serdes) {
                case ICE_PTP_SERDES_25G:
                        link = ICE_PTP_LNK_SPD_25G_RS;
                        break;
                case ICE_PTP_SERDES_50G:
                        link = ICE_PTP_LNK_SPD_50G_RS;
                        break;
                case ICE_PTP_SERDES_100G:
                        link = ICE_PTP_LNK_SPD_100G_RS;
                        break;
                default:
                        return -EIO;
                }
        } else {
                switch (serdes) {
                case ICE_PTP_SERDES_1G:
                        link = ICE_PTP_LNK_SPD_1G;
                        break;
                case ICE_PTP_SERDES_10G:
                        link = ICE_PTP_LNK_SPD_10G;
                        break;
                case ICE_PTP_SERDES_25G:
                        link = ICE_PTP_LNK_SPD_25G;
                        break;
                case ICE_PTP_SERDES_40G:
                        link = ICE_PTP_LNK_SPD_40G;
                        break;
                case ICE_PTP_SERDES_50G:
                        link = ICE_PTP_LNK_SPD_50G;
                        break;
                default:
                        return -EIO;
                }
        }

        if (link_out)
                *link_out = link;
        if (fec_out)
                *fec_out = fec;

        return 0;
}

/**
 * ice_phy_cfg_lane_e822 - Configure PHY quad for single/multi-lane timestamp
 * @hw: pointer to HW struct
 * @port: to configure the quad for
 */
static void ice_phy_cfg_lane_e822(struct ice_hw *hw, u8 port)
{
        enum ice_ptp_link_spd link_spd;
        int err;
        u32 val;
        u8 quad;

        err = ice_phy_get_speed_and_fec_e822(hw, port, &link_spd, NULL);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to get PHY link speed, err %d\n",
                          err);
                return;
        }

        quad = port / ICE_PORTS_PER_QUAD;

        err = ice_read_quad_reg_e822(hw, quad, Q_REG_TX_MEM_GBL_CFG, &val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read TX_MEM_GLB_CFG, err %d\n",
                          err);
                return;
        }

        if (link_spd >= ICE_PTP_LNK_SPD_40G)
                val &= ~Q_REG_TX_MEM_GBL_CFG_LANE_TYPE_M;
        else
                val |= Q_REG_TX_MEM_GBL_CFG_LANE_TYPE_M;

        err = ice_write_quad_reg_e822(hw, quad, Q_REG_TX_MEM_GBL_CFG, val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write back TX_MEM_GBL_CFG, err %d\n",
                          err);
                return;
        }
}

/**
 * ice_phy_cfg_uix_e822 - Configure Serdes UI to TU conversion for E822
 * @hw: pointer to the HW structure
 * @port: the port to configure
 *
 * Program the conversion ration of Serdes clock "unit intervals" (UIs) to PHC
 * hardware clock time units (TUs). That is, determine the number of TUs per
 * serdes unit interval, and program the UIX registers with this conversion.
 *
 * This conversion is used as part of the calibration process when determining
 * the additional error of a timestamp vs the real time of transmission or
 * receipt of the packet.
 *
 * Hardware uses the number of TUs per 66 UIs, written to the UIX registers
 * for the two main serdes clock rates, 10G/40G and 25G/100G serdes clocks.
 *
 * To calculate the conversion ratio, we use the following facts:
 *
 * a) the clock frequency in Hz (cycles per second)
 * b) the number of TUs per cycle (the increment value of the clock)
 * c) 1 second per 1 billion nanoseconds
 * d) the duration of 66 UIs in nanoseconds
 *
 * Given these facts, we can use the following table to work out what ratios
 * to multiply in order to get the number of TUs per 66 UIs:
 *
 * cycles |   1 second   | incval (TUs) | nanoseconds
 * -------+--------------+--------------+-------------
 * second | 1 billion ns |    cycle     |   66 UIs
 *
 * To perform the multiplication using integers without too much loss of
 * precision, we can take use the following equation:
 *
 * (freq * incval * 6600 LINE_UI ) / ( 100 * 1 billion)
 *
 * We scale up to using 6600 UI instead of 66 in order to avoid fractional
 * nanosecond UIs (66 UI at 10G/40G is 6.4 ns)
 *
 * The increment value has a maximum expected range of about 34 bits, while
 * the frequency value is about 29 bits. Multiplying these values shouldn't
 * overflow the 64 bits. However, we must then further multiply them again by
 * the Serdes unit interval duration. To avoid overflow here, we split the
 * overall divide by 1e11 into a divide by 256 (shift down by 8 bits) and
 * a divide by 390,625,000. This does lose some precision, but avoids
 * miscalculation due to arithmetic overflow.
 */
static int ice_phy_cfg_uix_e822(struct ice_hw *hw, u8 port)
{
        u64 cur_freq, clk_incval, tu_per_sec, uix;
        int err;

        cur_freq = ice_e822_pll_freq(ice_e822_time_ref(hw));
        clk_incval = ice_ptp_read_src_incval(hw);

        /* Calculate TUs per second divided by 256 */
        tu_per_sec = (cur_freq * clk_incval) >> 8;

#define LINE_UI_10G_40G 640 /* 6600 UIs is 640 nanoseconds at 10Gb/40Gb */
#define LINE_UI_25G_100G 256 /* 6600 UIs is 256 nanoseconds at 25Gb/100Gb */

        /* Program the 10Gb/40Gb conversion ratio */
        uix = div_u64(tu_per_sec * LINE_UI_10G_40G, 390625000);

        err = ice_write_64b_phy_reg_e822(hw, port, P_REG_UIX66_10G_40G_L,
                                         uix);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write UIX66_10G_40G, err %d\n",
                          err);
                return err;
        }

        /* Program the 25Gb/100Gb conversion ratio */
        uix = div_u64(tu_per_sec * LINE_UI_25G_100G, 390625000);

        err = ice_write_64b_phy_reg_e822(hw, port, P_REG_UIX66_25G_100G_L,
                                         uix);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write UIX66_25G_100G, err %d\n",
                          err);
                return err;
        }

        return 0;
}

/**
 * ice_phy_cfg_parpcs_e822 - Configure TUs per PAR/PCS clock cycle
 * @hw: pointer to the HW struct
 * @port: port to configure
 *
 * Configure the number of TUs for the PAR and PCS clocks used as part of the
 * timestamp calibration process. This depends on the link speed, as the PHY
 * uses different markers depending on the speed.
 *
 * 1Gb/10Gb/25Gb:
 * - Tx/Rx PAR/PCS markers
 *
 * 25Gb RS:
 * - Tx/Rx Reed Solomon gearbox PAR/PCS markers
 *
 * 40Gb/50Gb:
 * - Tx/Rx PAR/PCS markers
 * - Rx Deskew PAR/PCS markers
 *
 * 50G RS and 100GB RS:
 * - Tx/Rx Reed Solomon gearbox PAR/PCS markers
 * - Rx Deskew PAR/PCS markers
 * - Tx PAR/PCS markers
 *
 * To calculate the conversion, we use the PHC clock frequency (cycles per
 * second), the increment value (TUs per cycle), and the related PHY clock
 * frequency to calculate the TUs per unit of the PHY link clock. The
 * following table shows how the units convert:
 *
 * cycles |  TUs  | second
 * -------+-------+--------
 * second | cycle | cycles
 *
 * For each conversion register, look up the appropriate frequency from the
 * e822 PAR/PCS table and calculate the TUs per unit of that clock. Program
 * this to the appropriate register, preparing hardware to perform timestamp
 * calibration to calculate the total Tx or Rx offset to adjust the timestamp
 * in order to calibrate for the internal PHY delays.
 *
 * Note that the increment value ranges up to ~34 bits, and the clock
 * frequency is ~29 bits, so multiplying them together should fit within the
 * 64 bit arithmetic.
 */
static int ice_phy_cfg_parpcs_e822(struct ice_hw *hw, u8 port)
{
        u64 cur_freq, clk_incval, tu_per_sec, phy_tus;
        enum ice_ptp_link_spd link_spd;
        enum ice_ptp_fec_mode fec_mode;
        int err;

        err = ice_phy_get_speed_and_fec_e822(hw, port, &link_spd, &fec_mode);
        if (err)
                return err;

        cur_freq = ice_e822_pll_freq(ice_e822_time_ref(hw));
        clk_incval = ice_ptp_read_src_incval(hw);

        /* Calculate TUs per cycle of the PHC clock */
        tu_per_sec = cur_freq * clk_incval;

        /* For each PHY conversion register, look up the appropriate link
         * speed frequency and determine the TUs per that clock's cycle time.
         * Split this into a high and low value and then program the
         * appropriate register. If that link speed does not use the
         * associated register, write zeros to clear it instead.
         */

        /* P_REG_PAR_TX_TUS */
        if (e822_vernier[link_spd].tx_par_clk)
                phy_tus = div_u64(tu_per_sec,
                                  e822_vernier[link_spd].tx_par_clk);
        else
                phy_tus = 0;

        err = ice_write_40b_phy_reg_e822(hw, port, P_REG_PAR_TX_TUS_L,
                                         phy_tus);
        if (err)
                return err;

        /* P_REG_PAR_RX_TUS */
        if (e822_vernier[link_spd].rx_par_clk)
                phy_tus = div_u64(tu_per_sec,
                                  e822_vernier[link_spd].rx_par_clk);
        else
                phy_tus = 0;

        err = ice_write_40b_phy_reg_e822(hw, port, P_REG_PAR_RX_TUS_L,
                                         phy_tus);
        if (err)
                return err;

        /* P_REG_PCS_TX_TUS */
        if (e822_vernier[link_spd].tx_pcs_clk)
                phy_tus = div_u64(tu_per_sec,
                                  e822_vernier[link_spd].tx_pcs_clk);
        else
                phy_tus = 0;

        err = ice_write_40b_phy_reg_e822(hw, port, P_REG_PCS_TX_TUS_L,
                                         phy_tus);
        if (err)
                return err;

        /* P_REG_PCS_RX_TUS */
        if (e822_vernier[link_spd].rx_pcs_clk)
                phy_tus = div_u64(tu_per_sec,
                                  e822_vernier[link_spd].rx_pcs_clk);
        else
                phy_tus = 0;

        err = ice_write_40b_phy_reg_e822(hw, port, P_REG_PCS_RX_TUS_L,
                                         phy_tus);
        if (err)
                return err;

        /* P_REG_DESK_PAR_TX_TUS */
        if (e822_vernier[link_spd].tx_desk_rsgb_par)
                phy_tus = div_u64(tu_per_sec,
                                  e822_vernier[link_spd].tx_desk_rsgb_par);
        else
                phy_tus = 0;

        err = ice_write_40b_phy_reg_e822(hw, port, P_REG_DESK_PAR_TX_TUS_L,
                                         phy_tus);
        if (err)
                return err;

        /* P_REG_DESK_PAR_RX_TUS */
        if (e822_vernier[link_spd].rx_desk_rsgb_par)
                phy_tus = div_u64(tu_per_sec,
                                  e822_vernier[link_spd].rx_desk_rsgb_par);
        else
                phy_tus = 0;

        err = ice_write_40b_phy_reg_e822(hw, port, P_REG_DESK_PAR_RX_TUS_L,
                                         phy_tus);
        if (err)
                return err;

        /* P_REG_DESK_PCS_TX_TUS */
        if (e822_vernier[link_spd].tx_desk_rsgb_pcs)
                phy_tus = div_u64(tu_per_sec,
                                  e822_vernier[link_spd].tx_desk_rsgb_pcs);
        else
                phy_tus = 0;

        err = ice_write_40b_phy_reg_e822(hw, port, P_REG_DESK_PCS_TX_TUS_L,
                                         phy_tus);
        if (err)
                return err;

        /* P_REG_DESK_PCS_RX_TUS */
        if (e822_vernier[link_spd].rx_desk_rsgb_pcs)
                phy_tus = div_u64(tu_per_sec,
                                  e822_vernier[link_spd].rx_desk_rsgb_pcs);
        else
                phy_tus = 0;

        return ice_write_40b_phy_reg_e822(hw, port, P_REG_DESK_PCS_RX_TUS_L,
                                          phy_tus);
}

/**
 * ice_calc_fixed_tx_offset_e822 - Calculated Fixed Tx offset for a port
 * @hw: pointer to the HW struct
 * @link_spd: the Link speed to calculate for
 *
 * Calculate the fixed offset due to known static latency data.
 */
static u64
ice_calc_fixed_tx_offset_e822(struct ice_hw *hw, enum ice_ptp_link_spd link_spd)
{
        u64 cur_freq, clk_incval, tu_per_sec, fixed_offset;

        cur_freq = ice_e822_pll_freq(ice_e822_time_ref(hw));
        clk_incval = ice_ptp_read_src_incval(hw);

        /* Calculate TUs per second */
        tu_per_sec = cur_freq * clk_incval;

        /* Calculate number of TUs to add for the fixed Tx latency. Since the
         * latency measurement is in 1/100th of a nanosecond, we need to
         * multiply by tu_per_sec and then divide by 1e11. This calculation
         * overflows 64 bit integer arithmetic, so break it up into two
         * divisions by 1e4 first then by 1e7.
         */
        fixed_offset = div_u64(tu_per_sec, 10000);
        fixed_offset *= e822_vernier[link_spd].tx_fixed_delay;
        fixed_offset = div_u64(fixed_offset, 10000000);

        return fixed_offset;
}

/**
 * ice_phy_cfg_tx_offset_e822 - Configure total Tx timestamp offset
 * @hw: pointer to the HW struct
 * @port: the PHY port to configure
 *
 * Program the P_REG_TOTAL_TX_OFFSET register with the total number of TUs to
 * adjust Tx timestamps by. This is calculated by combining some known static
 * latency along with the Vernier offset computations done by hardware.
 *
 * This function must be called only after the offset registers are valid,
 * i.e. after the Vernier calibration wait has passed, to ensure that the PHY
 * has measured the offset.
 *
 * To avoid overflow, when calculating the offset based on the known static
 * latency values, we use measurements in 1/100th of a nanosecond, and divide
 * the TUs per second up front. This avoids overflow while allowing
 * calculation of the adjustment using integer arithmetic.
 */
static int ice_phy_cfg_tx_offset_e822(struct ice_hw *hw, u8 port)
{
        enum ice_ptp_link_spd link_spd;
        enum ice_ptp_fec_mode fec_mode;
        u64 total_offset, val;
        int err;

        err = ice_phy_get_speed_and_fec_e822(hw, port, &link_spd, &fec_mode);
        if (err)
                return err;

        total_offset = ice_calc_fixed_tx_offset_e822(hw, link_spd);

        /* Read the first Vernier offset from the PHY register and add it to
         * the total offset.
         */
        if (link_spd == ICE_PTP_LNK_SPD_1G ||
            link_spd == ICE_PTP_LNK_SPD_10G ||
            link_spd == ICE_PTP_LNK_SPD_25G ||
            link_spd == ICE_PTP_LNK_SPD_25G_RS ||
            link_spd == ICE_PTP_LNK_SPD_40G ||
            link_spd == ICE_PTP_LNK_SPD_50G) {
                err = ice_read_64b_phy_reg_e822(hw, port,
                                                P_REG_PAR_PCS_TX_OFFSET_L,
                                                &val);
                if (err)
                        return err;

                total_offset += val;
        }

        /* For Tx, we only need to use the second Vernier offset for
         * multi-lane link speeds with RS-FEC. The lanes will always be
         * aligned.
         */
        if (link_spd == ICE_PTP_LNK_SPD_50G_RS ||
            link_spd == ICE_PTP_LNK_SPD_100G_RS) {
                err = ice_read_64b_phy_reg_e822(hw, port,
                                                P_REG_PAR_TX_TIME_L,
                                                &val);
                if (err)
                        return err;

                total_offset += val;
        }

        /* Now that the total offset has been calculated, program it to the
         * PHY and indicate that the Tx offset is ready. After this,
         * timestamps will be enabled.
         */
        err = ice_write_64b_phy_reg_e822(hw, port, P_REG_TOTAL_TX_OFFSET_L,
                                         total_offset);
        if (err)
                return err;

        err = ice_write_phy_reg_e822(hw, port, P_REG_TX_OR, 1);
        if (err)
                return err;

        return 0;
}

/**
 * ice_phy_cfg_fixed_tx_offset_e822 - Configure Tx offset for bypass mode
 * @hw: pointer to the HW struct
 * @port: the PHY port to configure
 *
 * Calculate and program the fixed Tx offset, and indicate that the offset is
 * ready. This can be used when operating in bypass mode.
 */
static int
ice_phy_cfg_fixed_tx_offset_e822(struct ice_hw *hw, u8 port)
{
        enum ice_ptp_link_spd link_spd;
        enum ice_ptp_fec_mode fec_mode;
        u64 total_offset;
        int err;

        err = ice_phy_get_speed_and_fec_e822(hw, port, &link_spd, &fec_mode);
        if (err)
                return err;

        total_offset = ice_calc_fixed_tx_offset_e822(hw, link_spd);

        /* Program the fixed Tx offset into the P_REG_TOTAL_TX_OFFSET_L
         * register, then indicate that the Tx offset is ready. After this,
         * timestamps will be enabled.
         *
         * Note that this skips including the more precise offsets generated
         * by the Vernier calibration.
         */
        err = ice_write_64b_phy_reg_e822(hw, port, P_REG_TOTAL_TX_OFFSET_L,
                                         total_offset);
        if (err)
                return err;

        err = ice_write_phy_reg_e822(hw, port, P_REG_TX_OR, 1);
        if (err)
                return err;

        return 0;
}

/**
 * ice_phy_calc_pmd_adj_e822 - Calculate PMD adjustment for Rx
 * @hw: pointer to the HW struct
 * @port: the PHY port to adjust for
 * @link_spd: the current link speed of the PHY
 * @fec_mode: the current FEC mode of the PHY
 * @pmd_adj: on return, the amount to adjust the Rx total offset by
 *
 * Calculates the adjustment to Rx timestamps due to PMD alignment in the PHY.
 * This varies by link speed and FEC mode. The value calculated accounts for
 * various delays caused when receiving a packet.
 */
static int
ice_phy_calc_pmd_adj_e822(struct ice_hw *hw, u8 port,
                          enum ice_ptp_link_spd link_spd,
                          enum ice_ptp_fec_mode fec_mode, u64 *pmd_adj)
{
        u64 cur_freq, clk_incval, tu_per_sec, mult, adj;
        u8 pmd_align;
        u32 val;
        int err;

        err = ice_read_phy_reg_e822(hw, port, P_REG_PMD_ALIGNMENT, &val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read PMD alignment, err %d\n",
                          err);
                return err;
        }

        pmd_align = (u8)val;

        cur_freq = ice_e822_pll_freq(ice_e822_time_ref(hw));
        clk_incval = ice_ptp_read_src_incval(hw);

        /* Calculate TUs per second */
        tu_per_sec = cur_freq * clk_incval;

        /* The PMD alignment adjustment measurement depends on the link speed,
         * and whether FEC is enabled. For each link speed, the alignment
         * adjustment is calculated by dividing a value by the length of
         * a Time Unit in nanoseconds.
         *
         * 1G: align == 4 ? 10 * 0.8 : (align + 6 % 10) * 0.8
         * 10G: align == 65 ? 0 : (align * 0.1 * 32/33)
         * 10G w/FEC: align * 0.1 * 32/33
         * 25G: align == 65 ? 0 : (align * 0.4 * 32/33)
         * 25G w/FEC: align * 0.4 * 32/33
         * 40G: align == 65 ? 0 : (align * 0.1 * 32/33)
         * 40G w/FEC: align * 0.1 * 32/33
         * 50G: align == 65 ? 0 : (align * 0.4 * 32/33)
         * 50G w/FEC: align * 0.8 * 32/33
         *
         * For RS-FEC, if align is < 17 then we must also add 1.6 * 32/33.
         *
         * To allow for calculating this value using integer arithmetic, we
         * instead start with the number of TUs per second, (inverse of the
         * length of a Time Unit in nanoseconds), multiply by a value based
         * on the PMD alignment register, and then divide by the right value
         * calculated based on the table above. To avoid integer overflow this
         * division is broken up into a step of dividing by 125 first.
         */
        if (link_spd == ICE_PTP_LNK_SPD_1G) {
                if (pmd_align == 4)
                        mult = 10;
                else
                        mult = (pmd_align + 6) % 10;
        } else if (link_spd == ICE_PTP_LNK_SPD_10G ||
                   link_spd == ICE_PTP_LNK_SPD_25G ||
                   link_spd == ICE_PTP_LNK_SPD_40G ||
                   link_spd == ICE_PTP_LNK_SPD_50G) {
                /* If Clause 74 FEC, always calculate PMD adjust */
                if (pmd_align != 65 || fec_mode == ICE_PTP_FEC_MODE_CLAUSE74)
                        mult = pmd_align;
                else
                        mult = 0;
        } else if (link_spd == ICE_PTP_LNK_SPD_25G_RS ||
                   link_spd == ICE_PTP_LNK_SPD_50G_RS ||
                   link_spd == ICE_PTP_LNK_SPD_100G_RS) {
                if (pmd_align < 17)
                        mult = pmd_align + 40;
                else
                        mult = pmd_align;
        } else {
                ice_debug(hw, ICE_DBG_PTP, "Unknown link speed %d, skipping PMD adjustment\n",
                          link_spd);
                mult = 0;
        }

        /* In some cases, there's no need to adjust for the PMD alignment */
        if (!mult) {
                *pmd_adj = 0;
                return 0;
        }

        /* Calculate the adjustment by multiplying TUs per second by the
         * appropriate multiplier and divisor. To avoid overflow, we first
         * divide by 125, and then handle remaining divisor based on the link
         * speed pmd_adj_divisor value.
         */
        adj = div_u64(tu_per_sec, 125);
        adj *= mult;
        adj = div_u64(adj, e822_vernier[link_spd].pmd_adj_divisor);

        /* Finally, for 25G-RS and 50G-RS, a further adjustment for the Rx
         * cycle count is necessary.
         */
        if (link_spd == ICE_PTP_LNK_SPD_25G_RS) {
                u64 cycle_adj;
                u8 rx_cycle;

                err = ice_read_phy_reg_e822(hw, port, P_REG_RX_40_TO_160_CNT,
                                            &val);
                if (err) {
                        ice_debug(hw, ICE_DBG_PTP, "Failed to read 25G-RS Rx cycle count, err %d\n",
                                  err);
                        return err;
                }

                rx_cycle = val & P_REG_RX_40_TO_160_CNT_RXCYC_M;
                if (rx_cycle) {
                        mult = (4 - rx_cycle) * 40;

                        cycle_adj = div_u64(tu_per_sec, 125);
                        cycle_adj *= mult;
                        cycle_adj = div_u64(cycle_adj, e822_vernier[link_spd].pmd_adj_divisor);

                        adj += cycle_adj;
                }
        } else if (link_spd == ICE_PTP_LNK_SPD_50G_RS) {
                u64 cycle_adj;
                u8 rx_cycle;

                err = ice_read_phy_reg_e822(hw, port, P_REG_RX_80_TO_160_CNT,
                                            &val);
                if (err) {
                        ice_debug(hw, ICE_DBG_PTP, "Failed to read 50G-RS Rx cycle count, err %d\n",
                                  err);
                        return err;
                }

                rx_cycle = val & P_REG_RX_80_TO_160_CNT_RXCYC_M;
                if (rx_cycle) {
                        mult = rx_cycle * 40;

                        cycle_adj = div_u64(tu_per_sec, 125);
                        cycle_adj *= mult;
                        cycle_adj = div_u64(cycle_adj, e822_vernier[link_spd].pmd_adj_divisor);

                        adj += cycle_adj;
                }
        }

        /* Return the calculated adjustment */
        *pmd_adj = adj;

        return 0;
}

/**
 * ice_calc_fixed_rx_offset_e822 - Calculated the fixed Rx offset for a port
 * @hw: pointer to HW struct
 * @link_spd: The Link speed to calculate for
 *
 * Determine the fixed Rx latency for a given link speed.
 */
static u64
ice_calc_fixed_rx_offset_e822(struct ice_hw *hw, enum ice_ptp_link_spd link_spd)
{
        u64 cur_freq, clk_incval, tu_per_sec, fixed_offset;

        cur_freq = ice_e822_pll_freq(ice_e822_time_ref(hw));
        clk_incval = ice_ptp_read_src_incval(hw);

        /* Calculate TUs per second */
        tu_per_sec = cur_freq * clk_incval;

        /* Calculate number of TUs to add for the fixed Rx latency. Since the
         * latency measurement is in 1/100th of a nanosecond, we need to
         * multiply by tu_per_sec and then divide by 1e11. This calculation
         * overflows 64 bit integer arithmetic, so break it up into two
         * divisions by 1e4 first then by 1e7.
         */
        fixed_offset = div_u64(tu_per_sec, 10000);
        fixed_offset *= e822_vernier[link_spd].rx_fixed_delay;
        fixed_offset = div_u64(fixed_offset, 10000000);

        return fixed_offset;
}

/**
 * ice_phy_cfg_rx_offset_e822 - Configure total Rx timestamp offset
 * @hw: pointer to the HW struct
 * @port: the PHY port to configure
 *
 * Program the P_REG_TOTAL_RX_OFFSET register with the number of Time Units to
 * adjust Rx timestamps by. This combines calculations from the Vernier offset
 * measurements taken in hardware with some data about known fixed delay as
 * well as adjusting for multi-lane alignment delay.
 *
 * This function must be called only after the offset registers are valid,
 * i.e. after the Vernier calibration wait has passed, to ensure that the PHY
 * has measured the offset.
 *
 * To avoid overflow, when calculating the offset based on the known static
 * latency values, we use measurements in 1/100th of a nanosecond, and divide
 * the TUs per second up front. This avoids overflow while allowing
 * calculation of the adjustment using integer arithmetic.
 */
static int ice_phy_cfg_rx_offset_e822(struct ice_hw *hw, u8 port)
{
        enum ice_ptp_link_spd link_spd;
        enum ice_ptp_fec_mode fec_mode;
        u64 total_offset, pmd, val;
        int err;

        err = ice_phy_get_speed_and_fec_e822(hw, port, &link_spd, &fec_mode);
        if (err)
                return err;

        total_offset = ice_calc_fixed_rx_offset_e822(hw, link_spd);

        /* Read the first Vernier offset from the PHY register and add it to
         * the total offset.
         */
        err = ice_read_64b_phy_reg_e822(hw, port,
                                        P_REG_PAR_PCS_RX_OFFSET_L,
                                        &val);
        if (err)
                return err;

        total_offset += val;

        /* For Rx, all multi-lane link speeds include a second Vernier
         * calibration, because the lanes might not be aligned.
         */
        if (link_spd == ICE_PTP_LNK_SPD_40G ||
            link_spd == ICE_PTP_LNK_SPD_50G ||
            link_spd == ICE_PTP_LNK_SPD_50G_RS ||
            link_spd == ICE_PTP_LNK_SPD_100G_RS) {
                err = ice_read_64b_phy_reg_e822(hw, port,
                                                P_REG_PAR_RX_TIME_L,
                                                &val);
                if (err)
                        return err;

                total_offset += val;
        }

        /* In addition, Rx must account for the PMD alignment */
        err = ice_phy_calc_pmd_adj_e822(hw, port, link_spd, fec_mode, &pmd);
        if (err)
                return err;

        /* For RS-FEC, this adjustment adds delay, but for other modes, it
         * subtracts delay.
         */
        if (fec_mode == ICE_PTP_FEC_MODE_RS_FEC)
                total_offset += pmd;
        else
                total_offset -= pmd;

        /* Now that the total offset has been calculated, program it to the
         * PHY and indicate that the Rx offset is ready. After this,
         * timestamps will be enabled.
         */
        err = ice_write_64b_phy_reg_e822(hw, port, P_REG_TOTAL_RX_OFFSET_L,
                                         total_offset);
        if (err)
                return err;

        err = ice_write_phy_reg_e822(hw, port, P_REG_RX_OR, 1);
        if (err)
                return err;

        return 0;
}

/**
 * ice_phy_cfg_fixed_rx_offset_e822 - Configure fixed Rx offset for bypass mode
 * @hw: pointer to the HW struct
 * @port: the PHY port to configure
 *
 * Calculate and program the fixed Rx offset, and indicate that the offset is
 * ready. This can be used when operating in bypass mode.
 */
static int
ice_phy_cfg_fixed_rx_offset_e822(struct ice_hw *hw, u8 port)
{
        enum ice_ptp_link_spd link_spd;
        enum ice_ptp_fec_mode fec_mode;
        u64 total_offset;
        int err;

        err = ice_phy_get_speed_and_fec_e822(hw, port, &link_spd, &fec_mode);
        if (err)
                return err;

        total_offset = ice_calc_fixed_rx_offset_e822(hw, link_spd);

        /* Program the fixed Rx offset into the P_REG_TOTAL_RX_OFFSET_L
         * register, then indicate that the Rx offset is ready. After this,
         * timestamps will be enabled.
         *
         * Note that this skips including the more precise offsets generated
         * by Vernier calibration.
         */
        err = ice_write_64b_phy_reg_e822(hw, port, P_REG_TOTAL_RX_OFFSET_L,
                                         total_offset);
        if (err)
                return err;

        err = ice_write_phy_reg_e822(hw, port, P_REG_RX_OR, 1);
        if (err)
                return err;

        return 0;
}

/**
 * ice_read_phy_and_phc_time_e822 - Simultaneously capture PHC and PHY time
 * @hw: pointer to the HW struct
 * @port: the PHY port to read
 * @phy_time: on return, the 64bit PHY timer value
 * @phc_time: on return, the lower 64bits of PHC time
 *
 * Issue a READ_TIME timer command to simultaneously capture the PHY and PHC
 * timer values.
 */
static int
ice_read_phy_and_phc_time_e822(struct ice_hw *hw, u8 port, u64 *phy_time,
                               u64 *phc_time)
{
        u64 tx_time, rx_time;
        u32 zo, lo;
        u8 tmr_idx;
        int err;

        tmr_idx = ice_get_ptp_src_clock_index(hw);

        /* Prepare the PHC timer for a READ_TIME capture command */
        ice_ptp_src_cmd(hw, READ_TIME);

        /* Prepare the PHY timer for a READ_TIME capture command */
        err = ice_ptp_one_port_cmd(hw, port, READ_TIME);
        if (err)
                return err;

        /* Issue the sync to start the READ_TIME capture */
        ice_ptp_exec_tmr_cmd(hw);

        /* Read the captured PHC time from the shadow time registers */
        zo = rd32(hw, GLTSYN_SHTIME_0(tmr_idx));
        lo = rd32(hw, GLTSYN_SHTIME_L(tmr_idx));
        *phc_time = (u64)lo << 32 | zo;

        /* Read the captured PHY time from the PHY shadow registers */
        err = ice_ptp_read_port_capture(hw, port, &tx_time, &rx_time);
        if (err)
                return err;

        /* If the PHY Tx and Rx timers don't match, log a warning message.
         * Note that this should not happen in normal circumstances since the
         * driver always programs them together.
         */
        if (tx_time != rx_time)
                dev_warn(ice_hw_to_dev(hw),
                         "PHY port %u Tx and Rx timers do not match, tx_time 0x%016llX, rx_time 0x%016llX\n",
                         port, (unsigned long long)tx_time,
                         (unsigned long long)rx_time);

        *phy_time = tx_time;

        return 0;
}

/**
 * ice_sync_phy_timer_e822 - Synchronize the PHY timer with PHC timer
 * @hw: pointer to the HW struct
 * @port: the PHY port to synchronize
 *
 * Perform an adjustment to ensure that the PHY and PHC timers are in sync.
 * This is done by issuing a READ_TIME command which triggers a simultaneous
 * read of the PHY timer and PHC timer. Then we use the difference to
 * calculate an appropriate 2s complement addition to add to the PHY timer in
 * order to ensure it reads the same value as the primary PHC timer.
 */
static int ice_sync_phy_timer_e822(struct ice_hw *hw, u8 port)
{
        u64 phc_time, phy_time, difference;
        int err;

        if (!ice_ptp_lock(hw)) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to acquire PTP semaphore\n");
                return -EBUSY;
        }

        err = ice_read_phy_and_phc_time_e822(hw, port, &phy_time, &phc_time);
        if (err)
                goto err_unlock;

        /* Calculate the amount required to add to the port time in order for
         * it to match the PHC time.
         *
         * Note that the port adjustment is done using 2s complement
         * arithmetic. This is convenient since it means that we can simply
         * calculate the difference between the PHC time and the port time,
         * and it will be interpreted correctly.
         */
        difference = phc_time - phy_time;

        err = ice_ptp_prep_port_adj_e822(hw, port, (s64)difference);
        if (err)
                goto err_unlock;

        err = ice_ptp_one_port_cmd(hw, port, ADJ_TIME);
        if (err)
                goto err_unlock;

        /* Issue the sync to activate the time adjustment */
        ice_ptp_exec_tmr_cmd(hw);

        /* Re-capture the timer values to flush the command registers and
         * verify that the time was properly adjusted.
         */
        err = ice_read_phy_and_phc_time_e822(hw, port, &phy_time, &phc_time);
        if (err)
                goto err_unlock;

        dev_info(ice_hw_to_dev(hw),
                 "Port %u PHY time synced to PHC: 0x%016llX, 0x%016llX\n",
                 port, (unsigned long long)phy_time,
                 (unsigned long long)phc_time);

        ice_ptp_unlock(hw);

        return 0;

err_unlock:
        ice_ptp_unlock(hw);
        return err;
}

/**
 * ice_stop_phy_timer_e822 - Stop the PHY clock timer
 * @hw: pointer to the HW struct
 * @port: the PHY port to stop
 * @soft_reset: if true, hold the SOFT_RESET bit of P_REG_PS
 *
 * Stop the clock of a PHY port. This must be done as part of the flow to
 * re-calibrate Tx and Rx timestamping offsets whenever the clock time is
 * initialized or when link speed changes.
 */
int
ice_stop_phy_timer_e822(struct ice_hw *hw, u8 port, bool soft_reset)
{
        int err;
        u32 val;

        err = ice_write_phy_reg_e822(hw, port, P_REG_TX_OR, 0);
        if (err)
                return err;

        err = ice_write_phy_reg_e822(hw, port, P_REG_RX_OR, 0);
        if (err)
                return err;

        err = ice_read_phy_reg_e822(hw, port, P_REG_PS, &val);
        if (err)
                return err;

        val &= ~P_REG_PS_START_M;
        err = ice_write_phy_reg_e822(hw, port, P_REG_PS, val);
        if (err)
                return err;

        val &= ~P_REG_PS_ENA_CLK_M;
        err = ice_write_phy_reg_e822(hw, port, P_REG_PS, val);
        if (err)
                return err;

        if (soft_reset) {
                val |= P_REG_PS_SFT_RESET_M;
                err = ice_write_phy_reg_e822(hw, port, P_REG_PS, val);
                if (err)
                        return err;
        }

        ice_debug(hw, ICE_DBG_PTP, "Disabled clock on PHY port %u\n", port);

        return 0;
}

/**
 * ice_start_phy_timer_e822 - Start the PHY clock timer
 * @hw: pointer to the HW struct
 * @port: the PHY port to start
 * @bypass: if true, start the PHY in bypass mode
 *
 * Start the clock of a PHY port. This must be done as part of the flow to
 * re-calibrate Tx and Rx timestamping offsets whenever the clock time is
 * initialized or when link speed changes.
 *
 * Bypass mode enables timestamps immediately without waiting for Vernier
 * calibration to complete. Hardware will still continue taking Vernier
 * measurements on Tx or Rx of packets, but they will not be applied to
 * timestamps. Use ice_phy_exit_bypass_e822 to exit bypass mode once hardware
 * has completed offset calculation.
 */
int
ice_start_phy_timer_e822(struct ice_hw *hw, u8 port, bool bypass)
{
        u32 lo, hi, val;
        u64 incval;
        u8 tmr_idx;
        int err;

        tmr_idx = ice_get_ptp_src_clock_index(hw);

        err = ice_stop_phy_timer_e822(hw, port, false);
        if (err)
                return err;

        ice_phy_cfg_lane_e822(hw, port);

        err = ice_phy_cfg_uix_e822(hw, port);
        if (err)
                return err;

        err = ice_phy_cfg_parpcs_e822(hw, port);
        if (err)
                return err;

        lo = rd32(hw, GLTSYN_INCVAL_L(tmr_idx));
        hi = rd32(hw, GLTSYN_INCVAL_H(tmr_idx));
        incval = (u64)hi << 32 | lo;

        err = ice_write_40b_phy_reg_e822(hw, port, P_REG_TIMETUS_L, incval);
        if (err)
                return err;

        err = ice_ptp_one_port_cmd(hw, port, INIT_INCVAL);
        if (err)
                return err;

        ice_ptp_exec_tmr_cmd(hw);

        err = ice_read_phy_reg_e822(hw, port, P_REG_PS, &val);
        if (err)
                return err;

        val |= P_REG_PS_SFT_RESET_M;
        err = ice_write_phy_reg_e822(hw, port, P_REG_PS, val);
        if (err)
                return err;

        val |= P_REG_PS_START_M;
        err = ice_write_phy_reg_e822(hw, port, P_REG_PS, val);
        if (err)
                return err;

        val &= ~P_REG_PS_SFT_RESET_M;
        err = ice_write_phy_reg_e822(hw, port, P_REG_PS, val);
        if (err)
                return err;

        err = ice_ptp_one_port_cmd(hw, port, INIT_INCVAL);
        if (err)
                return err;

        ice_ptp_exec_tmr_cmd(hw);

        val |= P_REG_PS_ENA_CLK_M;
        err = ice_write_phy_reg_e822(hw, port, P_REG_PS, val);
        if (err)
                return err;

        val |= P_REG_PS_LOAD_OFFSET_M;
        err = ice_write_phy_reg_e822(hw, port, P_REG_PS, val);
        if (err)
                return err;

        ice_ptp_exec_tmr_cmd(hw);

        err = ice_sync_phy_timer_e822(hw, port);
        if (err)
                return err;

        if (bypass) {
                val |= P_REG_PS_BYPASS_MODE_M;
                /* Enter BYPASS mode, enabling timestamps immediately. */
                err = ice_write_phy_reg_e822(hw, port, P_REG_PS, val);
                if (err)
                        return err;

                /* Program the fixed Tx offset */
                err = ice_phy_cfg_fixed_tx_offset_e822(hw, port);
                if (err)
                        return err;

                /* Program the fixed Rx offset */
                err = ice_phy_cfg_fixed_rx_offset_e822(hw, port);
                if (err)
                        return err;
        }

        ice_debug(hw, ICE_DBG_PTP, "Enabled clock on PHY port %u\n", port);

        return 0;
}

/**
 * ice_phy_exit_bypass_e822 - Exit bypass mode, after vernier calculations
 * @hw: pointer to the HW struct
 * @port: the PHY port to configure
 *
 * After hardware finishes vernier calculations for the Tx and Rx offset, this
 * function can be used to exit bypass mode by updating the total Tx and Rx
 * offsets, and then disabling bypass. This will enable hardware to include
 * the more precise offset calibrations, increasing precision of the generated
 * timestamps.
 *
 * This cannot be done until hardware has measured the offsets, which requires
 * waiting until at least one packet has been sent and received by the device.
 */
int ice_phy_exit_bypass_e822(struct ice_hw *hw, u8 port)
{
        int err;
        u32 val;

        err = ice_read_phy_reg_e822(hw, port, P_REG_TX_OV_STATUS, &val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read TX_OV_STATUS for port %u, err %d\n",
                          port, err);
                return err;
        }

        if (!(val & P_REG_TX_OV_STATUS_OV_M)) {
                ice_debug(hw, ICE_DBG_PTP, "Tx offset is not yet valid for port %u\n",
                          port);
                return -EBUSY;
        }

        err = ice_read_phy_reg_e822(hw, port, P_REG_RX_OV_STATUS, &val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read RX_OV_STATUS for port %u, err %d\n",
                          port, err);
                return err;
        }

        if (!(val & P_REG_TX_OV_STATUS_OV_M)) {
                ice_debug(hw, ICE_DBG_PTP, "Rx offset is not yet valid for port %u\n",
                          port);
                return -EBUSY;
        }

        err = ice_phy_cfg_tx_offset_e822(hw, port);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to program total Tx offset for port %u, err %d\n",
                          port, err);
                return err;
        }

        err = ice_phy_cfg_rx_offset_e822(hw, port);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to program total Rx offset for port %u, err %d\n",
                          port, err);
                return err;
        }

        /* Exit bypass mode now that the offset has been updated */
        err = ice_read_phy_reg_e822(hw, port, P_REG_PS, &val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read P_REG_PS for port %u, err %d\n",
                          port, err);
                return err;
        }

        if (!(val & P_REG_PS_BYPASS_MODE_M))
                ice_debug(hw, ICE_DBG_PTP, "Port %u not in bypass mode\n",
                          port);

        val &= ~P_REG_PS_BYPASS_MODE_M;
        err = ice_write_phy_reg_e822(hw, port, P_REG_PS, val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to disable bypass for port %u, err %d\n",
                          port, err);
                return err;
        }

        dev_info(ice_hw_to_dev(hw), "Exiting bypass mode on PHY port %u\n",
                 port);

        return 0;
}

/* E810 functions
 *
 * The following functions operate on the E810 series devices which use
 * a separate external PHY.
 */

/**
 * ice_read_phy_reg_e810 - Read register from external PHY on E810
 * @hw: pointer to the HW struct
 * @addr: the address to read from
 * @val: On return, the value read from the PHY
 *
 * Read a register from the external PHY on the E810 device.
 */
static int ice_read_phy_reg_e810(struct ice_hw *hw, u32 addr, u32 *val)
{
        struct ice_sbq_msg_input msg = {0};
        int err;

        msg.msg_addr_low = lower_16_bits(addr);
        msg.msg_addr_high = upper_16_bits(addr);
        msg.opcode = ice_sbq_msg_rd;
        msg.dest_dev = rmn_0;

        err = ice_sbq_rw_reg(hw, &msg);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to send message to PHY, err %d\n",
                          err);
                return err;
        }

        *val = msg.data;

        return 0;
}

/**
 * ice_write_phy_reg_e810 - Write register on external PHY on E810
 * @hw: pointer to the HW struct
 * @addr: the address to writem to
 * @val: the value to write to the PHY
 *
 * Write a value to a register of the external PHY on the E810 device.
 */
static int ice_write_phy_reg_e810(struct ice_hw *hw, u32 addr, u32 val)
{
        struct ice_sbq_msg_input msg = {0};
        int err;

        msg.msg_addr_low = lower_16_bits(addr);
        msg.msg_addr_high = upper_16_bits(addr);
        msg.opcode = ice_sbq_msg_wr;
        msg.dest_dev = rmn_0;
        msg.data = val;

        err = ice_sbq_rw_reg(hw, &msg);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to send message to PHY, err %d\n",
                          err);
                return err;
        }

        return 0;
}

/**
 * ice_read_phy_tstamp_e810 - Read a PHY timestamp out of the external PHY
 * @hw: pointer to the HW struct
 * @lport: the lport to read from
 * @idx: the timestamp index to read
 * @tstamp: on return, the 40bit timestamp value
 *
 * Read a 40bit timestamp value out of the timestamp block of the external PHY
 * on the E810 device.
 */
static int
ice_read_phy_tstamp_e810(struct ice_hw *hw, u8 lport, u8 idx, u64 *tstamp)
{
        u32 lo_addr, hi_addr, lo, hi;
        int err;

        lo_addr = TS_EXT(LOW_TX_MEMORY_BANK_START, lport, idx);
        hi_addr = TS_EXT(HIGH_TX_MEMORY_BANK_START, lport, idx);

        err = ice_read_phy_reg_e810(hw, lo_addr, &lo);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read low PTP timestamp register, err %d\n",
                          err);
                return err;
        }

        err = ice_read_phy_reg_e810(hw, hi_addr, &hi);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read high PTP timestamp register, err %d\n",
                          err);
                return err;
        }

        /* For E810 devices, the timestamp is reported with the lower 32 bits
         * in the low register, and the upper 8 bits in the high register.
         */
        *tstamp = ((u64)hi) << TS_HIGH_S | ((u64)lo & TS_LOW_M);

        return 0;
}

/**
 * ice_clear_phy_tstamp_e810 - Clear a timestamp from the external PHY
 * @hw: pointer to the HW struct
 * @lport: the lport to read from
 * @idx: the timestamp index to reset
 *
 * Clear a timestamp, resetting its valid bit, from the timestamp block of the
 * external PHY on the E810 device.
 */
static int ice_clear_phy_tstamp_e810(struct ice_hw *hw, u8 lport, u8 idx)
{
        u32 lo_addr, hi_addr;
        int err;

        lo_addr = TS_EXT(LOW_TX_MEMORY_BANK_START, lport, idx);
        hi_addr = TS_EXT(HIGH_TX_MEMORY_BANK_START, lport, idx);

        err = ice_write_phy_reg_e810(hw, lo_addr, 0);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to clear low PTP timestamp register, err %d\n",
                          err);
                return err;
        }

        err = ice_write_phy_reg_e810(hw, hi_addr, 0);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to clear high PTP timestamp register, err %d\n",
                          err);
                return err;
        }

        return 0;
}

/**
 * ice_ptp_init_phy_e810 - Enable PTP function on the external PHY
 * @hw: pointer to HW struct
 *
 * Enable the timesync PTP functionality for the external PHY connected to
 * this function.
 */
int ice_ptp_init_phy_e810(struct ice_hw *hw)
{
        u8 tmr_idx;
        int err;

        tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
        err = ice_write_phy_reg_e810(hw, ETH_GLTSYN_ENA(tmr_idx),
                                     GLTSYN_ENA_TSYN_ENA_M);
        if (err)
                ice_debug(hw, ICE_DBG_PTP, "PTP failed in ena_phy_time_syn %d\n",
                          err);

        return err;
}

/**
 * ice_ptp_init_phc_e810 - Perform E810 specific PHC initialization
 * @hw: pointer to HW struct
 *
 * Perform E810-specific PTP hardware clock initialization steps.
 */
static int ice_ptp_init_phc_e810(struct ice_hw *hw)
{
        /* Ensure synchronization delay is zero */
        wr32(hw, GLTSYN_SYNC_DLAY, 0);

        /* Initialize the PHY */
        return ice_ptp_init_phy_e810(hw);
}

/**
 * ice_ptp_prep_phy_time_e810 - Prepare PHY port with initial time
 * @hw: Board private structure
 * @time: Time to initialize the PHY port clock to
 *
 * Program the PHY port ETH_GLTSYN_SHTIME registers in preparation setting the
 * initial clock time. The time will not actually be programmed until the
 * driver issues an INIT_TIME command.
 *
 * The time value is the upper 32 bits of the PHY timer, usually in units of
 * nominal nanoseconds.
 */
static int ice_ptp_prep_phy_time_e810(struct ice_hw *hw, u32 time)
{
        u8 tmr_idx;
        int err;

        tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
        err = ice_write_phy_reg_e810(hw, ETH_GLTSYN_SHTIME_0(tmr_idx), 0);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write SHTIME_0, err %d\n",
                          err);
                return err;
        }

        err = ice_write_phy_reg_e810(hw, ETH_GLTSYN_SHTIME_L(tmr_idx), time);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write SHTIME_L, err %d\n",
                          err);
                return err;
        }

        return 0;
}

/**
 * ice_ptp_prep_phy_adj_e810 - Prep PHY port for a time adjustment
 * @hw: pointer to HW struct
 * @adj: adjustment value to program
 *
 * Prepare the PHY port for an atomic adjustment by programming the PHY
 * ETH_GLTSYN_SHADJ_L and ETH_GLTSYN_SHADJ_H registers. The actual adjustment
 * is completed by issuing an ADJ_TIME sync command.
 *
 * The adjustment value only contains the portion used for the upper 32bits of
 * the PHY timer, usually in units of nominal nanoseconds. Negative
 * adjustments are supported using 2s complement arithmetic.
 */
static int ice_ptp_prep_phy_adj_e810(struct ice_hw *hw, s32 adj)
{
        u8 tmr_idx;
        int err;

        tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;

        /* Adjustments are represented as signed 2's complement values in
         * nanoseconds. Sub-nanosecond adjustment is not supported.
         */
        err = ice_write_phy_reg_e810(hw, ETH_GLTSYN_SHADJ_L(tmr_idx), 0);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write adj to PHY SHADJ_L, err %d\n",
                          err);
                return err;
        }

        err = ice_write_phy_reg_e810(hw, ETH_GLTSYN_SHADJ_H(tmr_idx), adj);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write adj to PHY SHADJ_H, err %d\n",
                          err);
                return err;
        }

        return 0;
}

/**
 * ice_ptp_prep_phy_incval_e810 - Prep PHY port increment value change
 * @hw: pointer to HW struct
 * @incval: The new 40bit increment value to prepare
 *
 * Prepare the PHY port for a new increment value by programming the PHY
 * ETH_GLTSYN_SHADJ_L and ETH_GLTSYN_SHADJ_H registers. The actual change is
 * completed by issuing an INIT_INCVAL command.
 */
static int ice_ptp_prep_phy_incval_e810(struct ice_hw *hw, u64 incval)
{
        u32 high, low;
        u8 tmr_idx;
        int err;

        tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
        low = lower_32_bits(incval);
        high = upper_32_bits(incval);

        err = ice_write_phy_reg_e810(hw, ETH_GLTSYN_SHADJ_L(tmr_idx), low);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write incval to PHY SHADJ_L, err %d\n",
                          err);
                return err;
        }

        err = ice_write_phy_reg_e810(hw, ETH_GLTSYN_SHADJ_H(tmr_idx), high);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write incval PHY SHADJ_H, err %d\n",
                          err);
                return err;
        }

        return 0;
}

/**
 * ice_ptp_port_cmd_e810 - Prepare all external PHYs for a timer command
 * @hw: pointer to HW struct
 * @cmd: Command to be sent to the port
 *
 * Prepare the external PHYs connected to this device for a timer sync
 * command.
 */
static int ice_ptp_port_cmd_e810(struct ice_hw *hw, enum ice_ptp_tmr_cmd cmd)
{
        u32 cmd_val, val;
        int err;

        switch (cmd) {
        case INIT_TIME:
                cmd_val = GLTSYN_CMD_INIT_TIME;
                break;
        case INIT_INCVAL:
                cmd_val = GLTSYN_CMD_INIT_INCVAL;
                break;
        case ADJ_TIME:
                cmd_val = GLTSYN_CMD_ADJ_TIME;
                break;
        case READ_TIME:
                cmd_val = GLTSYN_CMD_READ_TIME;
                break;
        case ADJ_TIME_AT_TIME:
                cmd_val = GLTSYN_CMD_ADJ_INIT_TIME;
                break;
        }

        /* Read, modify, write */
        err = ice_read_phy_reg_e810(hw, ETH_GLTSYN_CMD, &val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to read GLTSYN_CMD, err %d\n", err);
                return err;
        }

        /* Modify necessary bits only and perform write */
        val &= ~TS_CMD_MASK_E810;
        val |= cmd_val;

        err = ice_write_phy_reg_e810(hw, ETH_GLTSYN_CMD, val);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to write back GLTSYN_CMD, err %d\n", err);
                return err;
        }

        return 0;
}

/* Device agnostic functions
 *
 * The following functions implement shared behavior common to both E822 and
 * E810 devices, possibly calling a device specific implementation where
 * necessary.
 */

/**
 * ice_ptp_lock - Acquire PTP global semaphore register lock
 * @hw: pointer to the HW struct
 *
 * Acquire the global PTP hardware semaphore lock. Returns true if the lock
 * was acquired, false otherwise.
 *
 * The PFTSYN_SEM register sets the busy bit on read, returning the previous
 * value. If software sees the busy bit cleared, this means that this function
 * acquired the lock (and the busy bit is now set). If software sees the busy
 * bit set, it means that another function acquired the lock.
 *
 * Software must clear the busy bit with a write to release the lock for other
 * functions when done.
 */
bool ice_ptp_lock(struct ice_hw *hw)
{
        u32 hw_lock;
        int i;

#define MAX_TRIES 5

        for (i = 0; i < MAX_TRIES; i++) {
                hw_lock = rd32(hw, PFTSYN_SEM + (PFTSYN_SEM_BYTES * hw->pf_id));
                hw_lock = hw_lock & PFTSYN_SEM_BUSY_M;
                if (!hw_lock)
                        break;

                /* Somebody is holding the lock */
                usleep_range(10000, 20000);
        }

        return !hw_lock;
}

/**
 * ice_ptp_unlock - Release PTP global semaphore register lock
 * @hw: pointer to the HW struct
 *
 * Release the global PTP hardware semaphore lock. This is done by writing to
 * the PFTSYN_SEM register.
 */
void ice_ptp_unlock(struct ice_hw *hw)
{
        wr32(hw, PFTSYN_SEM + (PFTSYN_SEM_BYTES * hw->pf_id), 0);
}

/**
 * ice_ptp_tmr_cmd - Prepare and trigger a timer sync command
 * @hw: pointer to HW struct
 * @cmd: the command to issue
 *
 * Prepare the source timer and PHY timers and then trigger the requested
 * command. This causes the shadow registers previously written in preparation
 * for the command to be synchronously applied to both the source and PHY
 * timers.
 */
static int ice_ptp_tmr_cmd(struct ice_hw *hw, enum ice_ptp_tmr_cmd cmd)
{
        int err;

        /* First, prepare the source timer */
        ice_ptp_src_cmd(hw, cmd);

        /* Next, prepare the ports */
        if (ice_is_e810(hw))
                err = ice_ptp_port_cmd_e810(hw, cmd);
        else
                err = ice_ptp_port_cmd_e822(hw, cmd);
        if (err) {
                ice_debug(hw, ICE_DBG_PTP, "Failed to prepare PHY ports for timer command %u, err %d\n",
                          cmd, err);
                return err;
        }

        /* Write the sync command register to drive both source and PHY timer
         * commands synchronously
         */
        ice_ptp_exec_tmr_cmd(hw);

        return 0;
}

/**
 * ice_ptp_init_time - Initialize device time to provided value
 * @hw: pointer to HW struct
 * @time: 64bits of time (GLTSYN_TIME_L and GLTSYN_TIME_H)
 *
 * Initialize the device to the specified time provided. This requires a three
 * step process:
 *
 * 1) write the new init time to the source timer shadow registers
 * 2) write the new init time to the PHY timer shadow registers
 * 3) issue an init_time timer command to synchronously switch both the source
 *    and port timers to the new init time value at the next clock cycle.
 */
int ice_ptp_init_time(struct ice_hw *hw, u64 time)
{
        u8 tmr_idx;
        int err;

        tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;

        /* Source timers */
        wr32(hw, GLTSYN_SHTIME_L(tmr_idx), lower_32_bits(time));
        wr32(hw, GLTSYN_SHTIME_H(tmr_idx), upper_32_bits(time));
        wr32(hw, GLTSYN_SHTIME_0(tmr_idx), 0);

        /* PHY timers */
        /* Fill Rx and Tx ports and send msg to PHY */
        if (ice_is_e810(hw))
                err = ice_ptp_prep_phy_time_e810(hw, time & 0xFFFFFFFF);
        else
                err = ice_ptp_prep_phy_time_e822(hw, time & 0xFFFFFFFF);
        if (err)
                return err;

        return ice_ptp_tmr_cmd(hw, INIT_TIME);
}

/**
 * ice_ptp_write_incval - Program PHC with new increment value
 * @hw: pointer to HW struct
 * @incval: Source timer increment value per clock cycle
 *
 * Program the PHC with a new increment value. This requires a three-step
 * process:
 *
 * 1) Write the increment value to the source timer shadow registers
 * 2) Write the increment value to the PHY timer shadow registers
 * 3) Issue an INIT_INCVAL timer command to synchronously switch both the

 *    source and port timers to the new increment value at the next clock
 *    cycle.
 */
int ice_ptp_write_incval(struct ice_hw *hw, u64 incval)
{
        u8 tmr_idx;
        int err;

        tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;

        /* Shadow Adjust */
        wr32(hw, GLTSYN_SHADJ_L(tmr_idx), lower_32_bits(incval));
        wr32(hw, GLTSYN_SHADJ_H(tmr_idx), upper_32_bits(incval));

        if (ice_is_e810(hw))
                err = ice_ptp_prep_phy_incval_e810(hw, incval);
        else
                err = ice_ptp_prep_phy_incval_e822(hw, incval);
        if (err)
                return err;

        return ice_ptp_tmr_cmd(hw, INIT_INCVAL);
}

/**
 * ice_ptp_write_incval_locked - Program new incval while holding semaphore
 * @hw: pointer to HW struct
 * @incval: Source timer increment value per clock cycle
 *
 * Program a new PHC incval while holding the PTP semaphore.
 */
int ice_ptp_write_incval_locked(struct ice_hw *hw, u64 incval)
{
        int err;

        if (!ice_ptp_lock(hw))
                return -EBUSY;

        err = ice_ptp_write_incval(hw, incval);

        ice_ptp_unlock(hw);

        return err;
}

/**
 * ice_ptp_adj_clock - Adjust PHC clock time atomically
 * @hw: pointer to HW struct
 * @adj: Adjustment in nanoseconds
 *
 * Perform an atomic adjustment of the PHC time by the specified number of
 * nanoseconds. This requires a three-step process:
 *
 * 1) Write the adjustment to the source timer shadow registers
 * 2) Write the adjustment to the PHY timer shadow registers
 * 3) Issue an ADJ_TIME timer command to synchronously apply the adjustment to
 *    both the source and port timers at the next clock cycle.
 */
int ice_ptp_adj_clock(struct ice_hw *hw, s32 adj)
{
        u8 tmr_idx;
        int err;

        tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;

        /* Write the desired clock adjustment into the GLTSYN_SHADJ register.
         * For an ADJ_TIME command, this set of registers represents the value
         * to add to the clock time. It supports subtraction by interpreting
         * the value as a 2's complement integer.
         */
        wr32(hw, GLTSYN_SHADJ_L(tmr_idx), 0);
        wr32(hw, GLTSYN_SHADJ_H(tmr_idx), adj);

        if (ice_is_e810(hw))
                err = ice_ptp_prep_phy_adj_e810(hw, adj);
        else
                err = ice_ptp_prep_phy_adj_e822(hw, adj);
        if (err)
                return err;

        return ice_ptp_tmr_cmd(hw, ADJ_TIME);
}

/**
 * ice_read_phy_tstamp - Read a PHY timestamp from the timestamo block
 * @hw: pointer to the HW struct
 * @block: the block to read from
 * @idx: the timestamp index to read
 * @tstamp: on return, the 40bit timestamp value
 *
 * Read a 40bit timestamp value out of the timestamp block. For E822 devices,
 * the block is the quad to read from. For E810 devices, the block is the
 * logical port to read from.
 */
int ice_read_phy_tstamp(struct ice_hw *hw, u8 block, u8 idx, u64 *tstamp)
{
        if (ice_is_e810(hw))
                return ice_read_phy_tstamp_e810(hw, block, idx, tstamp);
        else
                return ice_read_phy_tstamp_e822(hw, block, idx, tstamp);
}

/**
 * ice_clear_phy_tstamp - Clear a timestamp from the timestamp block
 * @hw: pointer to the HW struct
 * @block: the block to read from
 * @idx: the timestamp index to reset
 *
 * Clear a timestamp, resetting its valid bit, from the timestamp block. For
 * E822 devices, the block is the quad to clear from. For E810 devices, the
 * block is the logical port to clear from.
 */
int ice_clear_phy_tstamp(struct ice_hw *hw, u8 block, u8 idx)
{
        if (ice_is_e810(hw))
                return ice_clear_phy_tstamp_e810(hw, block, idx);
        else
                return ice_clear_phy_tstamp_e822(hw, block, idx);
}

/* E810T SMA functions
 *
 * The following functions operate specifically on E810T hardware and are used
 * to access the extended GPIOs available.
 */

/**
 * ice_get_pca9575_handle
 * @hw: pointer to the hw struct
 * @pca9575_handle: GPIO controller's handle
 *
 * Find and return the GPIO controller's handle in the netlist.
 * When found - the value will be cached in the hw structure and following calls
 * will return cached value
 */
static int
ice_get_pca9575_handle(struct ice_hw *hw, u16 *pca9575_handle)
{
        struct ice_aqc_get_link_topo *cmd;
        struct ice_aq_desc desc;
        int status;
        u8 idx;

        /* If handle was read previously return cached value */
        if (hw->io_expander_handle) {
                *pca9575_handle = hw->io_expander_handle;
                return 0;
        }

        /* If handle was not detected read it from the netlist */
        cmd = &desc.params.get_link_topo;
        ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_get_link_topo);

        /* Set node type to GPIO controller */
        cmd->addr.topo_params.node_type_ctx =
                (ICE_AQC_LINK_TOPO_NODE_TYPE_M &
                 ICE_AQC_LINK_TOPO_NODE_TYPE_GPIO_CTRL);

#define SW_PCA9575_SFP_TOPO_IDX         2
#define SW_PCA9575_QSFP_TOPO_IDX        1

        /* Check if the SW IO expander controlling SMA exists in the netlist. */
        if (hw->device_id == ICE_DEV_ID_E810C_SFP)
                idx = SW_PCA9575_SFP_TOPO_IDX;
        else if (hw->device_id == ICE_DEV_ID_E810C_QSFP)
                idx = SW_PCA9575_QSFP_TOPO_IDX;
        else
                return -EOPNOTSUPP;

        cmd->addr.topo_params.index = idx;

        status = ice_aq_send_cmd(hw, &desc, NULL, 0, NULL);
        if (status)
                return -EOPNOTSUPP;

        /* Verify if we found the right IO expander type */
        if (desc.params.get_link_topo.node_part_num !=
                ICE_AQC_GET_LINK_TOPO_NODE_NR_PCA9575)
                return -EOPNOTSUPP;

        /* If present save the handle and return it */
        hw->io_expander_handle =
                le16_to_cpu(desc.params.get_link_topo.addr.handle);
        *pca9575_handle = hw->io_expander_handle;

        return 0;
}

/**
 * ice_read_sma_ctrl_e810t
 * @hw: pointer to the hw struct
 * @data: pointer to data to be read from the GPIO controller
 *
 * Read the SMA controller state. It is connected to pins 3-7 of Port 1 of the
 * PCA9575 expander, so only bits 3-7 in data are valid.
 */
int ice_read_sma_ctrl_e810t(struct ice_hw *hw, u8 *data)
{
        int status;
        u16 handle;
        u8 i;

        status = ice_get_pca9575_handle(hw, &handle);
        if (status)
                return status;

        *data = 0;

        for (i = ICE_SMA_MIN_BIT_E810T; i <= ICE_SMA_MAX_BIT_E810T; i++) {
                bool pin;

                status = ice_aq_get_gpio(hw, handle, i + ICE_PCA9575_P1_OFFSET,
                                         &pin, NULL);
                if (status)
                        break;
                *data |= (u8)(!pin) << i;
        }

        return status;
}

/**
 * ice_write_sma_ctrl_e810t
 * @hw: pointer to the hw struct
 * @data: data to be written to the GPIO controller
 *
 * Write the data to the SMA controller. It is connected to pins 3-7 of Port 1
 * of the PCA9575 expander, so only bits 3-7 in data are valid.
 */
int ice_write_sma_ctrl_e810t(struct ice_hw *hw, u8 data)
{
        int status;
        u16 handle;
        u8 i;

        status = ice_get_pca9575_handle(hw, &handle);
        if (status)
                return status;

        for (i = ICE_SMA_MIN_BIT_E810T; i <= ICE_SMA_MAX_BIT_E810T; i++) {
                bool pin;

                pin = !(data & (1 << i));
                status = ice_aq_set_gpio(hw, handle, i + ICE_PCA9575_P1_OFFSET,
                                         pin, NULL);
                if (status)
                        break;
        }

        return status;
}

/**
 * ice_is_pca9575_present
 * @hw: pointer to the hw struct
 *
 * Check if the SW IO expander is present in the netlist
 */
bool ice_is_pca9575_present(struct ice_hw *hw)
{
        u16 handle = 0;
        int status;

        if (!ice_is_e810t(hw))
                return false;

        status = ice_get_pca9575_handle(hw, &handle);

        return !status && handle;
}

/**
 * ice_ptp_init_phc - Initialize PTP hardware clock
 * @hw: pointer to the HW struct
 *
 * Perform the steps required to initialize the PTP hardware clock.
 */
int ice_ptp_init_phc(struct ice_hw *hw)
{
        u8 src_idx = hw->func_caps.ts_func_info.tmr_index_owned;

        /* Enable source clocks */
        wr32(hw, GLTSYN_ENA(src_idx), GLTSYN_ENA_TSYN_ENA_M);

        /* Clear event err indications for auxiliary pins */
        (void)rd32(hw, GLTSYN_STAT(src_idx));

        if (ice_is_e810(hw))
                return ice_ptp_init_phc_e810(hw);
        else
                return ice_ptp_init_phc_e822(hw);
}