// SPDX-License-Identifier: BSD-3-Clause
/* Copyright (c) 2016-2018, NXP Semiconductors
 * Copyright (c) 2018-2019, Vladimir Oltean <olteanv@gmail.com>
 */
#include <linux/packing.h>
#include "sja1105.h"

#define SJA1105_SIZE_CGU_CMD    4

struct sja1105_cfg_pad_mii_tx {
        u64 d32_os;
        u64 d32_ipud;
        u64 d10_os;
        u64 d10_ipud;
        u64 ctrl_os;
        u64 ctrl_ipud;
        u64 clk_os;
        u64 clk_ih;
        u64 clk_ipud;
};

struct sja1105_cfg_pad_mii_id {
        u64 rxc_stable_ovr;
        u64 rxc_delay;
        u64 rxc_bypass;
        u64 rxc_pd;
        u64 txc_stable_ovr;
        u64 txc_delay;
        u64 txc_bypass;
        u64 txc_pd;
};

/* UM10944 Table 82.
 * IDIV_0_C to IDIV_4_C control registers
 * (addr. 10000Bh to 10000Fh)
 */
struct sja1105_cgu_idiv {
        u64 clksrc;
        u64 autoblock;
        u64 idiv;
        u64 pd;
};

/* PLL_1_C control register
 *
 * SJA1105 E/T: UM10944 Table 81 (address 10000Ah)
 * SJA1105 P/Q/R/S: UM11040 Table 116 (address 10000Ah)
 */
struct sja1105_cgu_pll_ctrl {
        u64 pllclksrc;
        u64 msel;
        u64 autoblock;
        u64 psel;
        u64 direct;
        u64 fbsel;
        u64 bypass;
        u64 pd;
};

enum {
        CLKSRC_MII0_TX_CLK      = 0x00,
        CLKSRC_MII0_RX_CLK      = 0x01,
        CLKSRC_MII1_TX_CLK      = 0x02,
        CLKSRC_MII1_RX_CLK      = 0x03,
        CLKSRC_MII2_TX_CLK      = 0x04,
        CLKSRC_MII2_RX_CLK      = 0x05,
        CLKSRC_MII3_TX_CLK      = 0x06,
        CLKSRC_MII3_RX_CLK      = 0x07,
        CLKSRC_MII4_TX_CLK      = 0x08,
        CLKSRC_MII4_RX_CLK      = 0x09,
        CLKSRC_PLL0             = 0x0B,
        CLKSRC_PLL1             = 0x0E,
        CLKSRC_IDIV0            = 0x11,
        CLKSRC_IDIV1            = 0x12,
        CLKSRC_IDIV2            = 0x13,
        CLKSRC_IDIV3            = 0x14,
        CLKSRC_IDIV4            = 0x15,
};

/* UM10944 Table 83.
 * MIIx clock control registers 1 to 30
 * (addresses 100013h to 100035h)
 */
struct sja1105_cgu_mii_ctrl {
        u64 clksrc;
        u64 autoblock;
        u64 pd;
};

static void sja1105_cgu_idiv_packing(void *buf, struct sja1105_cgu_idiv *idiv,
                                     enum packing_op op)
{
        const int size = 4;

        sja1105_packing(buf, &idiv->clksrc,    28, 24, size, op);
        sja1105_packing(buf, &idiv->autoblock, 11, 11, size, op);
        sja1105_packing(buf, &idiv->idiv,       5,  2, size, op);
        sja1105_packing(buf, &idiv->pd,         0,  0, size, op);
}

static int sja1105_cgu_idiv_config(struct sja1105_private *priv, int port,
                                   bool enabled, int factor)
{
        const struct sja1105_regs *regs = priv->info->regs;
        struct device *dev = priv->ds->dev;
        struct sja1105_cgu_idiv idiv;
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};

        if (enabled && factor != 1 && factor != 10) {
                dev_err(dev, "idiv factor must be 1 or 10\n");
                return -ERANGE;
        }

        /* Payload for packed_buf */
        idiv.clksrc    = 0x0A;            /* 25MHz */
        idiv.autoblock = 1;               /* Block clk automatically */
        idiv.idiv      = factor - 1;      /* Divide by 1 or 10 */
        idiv.pd        = enabled ? 0 : 1; /* Power down? */
        sja1105_cgu_idiv_packing(packed_buf, &idiv, PACK);

        return sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                           regs->cgu_idiv[port], packed_buf,
                                           SJA1105_SIZE_CGU_CMD);
}

static void
sja1105_cgu_mii_control_packing(void *buf, struct sja1105_cgu_mii_ctrl *cmd,
                                enum packing_op op)
{
        const int size = 4;

        sja1105_packing(buf, &cmd->clksrc,    28, 24, size, op);
        sja1105_packing(buf, &cmd->autoblock, 11, 11, size, op);
        sja1105_packing(buf, &cmd->pd,         0,  0, size, op);
}

static int sja1105_cgu_mii_tx_clk_config(struct sja1105_private *priv,
                                         int port, sja1105_mii_role_t role)
{
        const struct sja1105_regs *regs = priv->info->regs;
        struct sja1105_cgu_mii_ctrl mii_tx_clk;
        const int mac_clk_sources[] = {
                CLKSRC_MII0_TX_CLK,
                CLKSRC_MII1_TX_CLK,
                CLKSRC_MII2_TX_CLK,
                CLKSRC_MII3_TX_CLK,
                CLKSRC_MII4_TX_CLK,
        };
        const int phy_clk_sources[] = {
                CLKSRC_IDIV0,
                CLKSRC_IDIV1,
                CLKSRC_IDIV2,
                CLKSRC_IDIV3,
                CLKSRC_IDIV4,
        };
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
        int clksrc;

        if (role == XMII_MAC)
                clksrc = mac_clk_sources[port];
        else
                clksrc = phy_clk_sources[port];

        /* Payload for packed_buf */
        mii_tx_clk.clksrc    = clksrc;
        mii_tx_clk.autoblock = 1;  /* Autoblock clk while changing clksrc */
        mii_tx_clk.pd        = 0;  /* Power Down off => enabled */
        sja1105_cgu_mii_control_packing(packed_buf, &mii_tx_clk, PACK);

        return sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                           regs->mii_tx_clk[port], packed_buf,
                                           SJA1105_SIZE_CGU_CMD);
}

static int
sja1105_cgu_mii_rx_clk_config(struct sja1105_private *priv, int port)
{
        const struct sja1105_regs *regs = priv->info->regs;
        struct sja1105_cgu_mii_ctrl mii_rx_clk;
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
        const int clk_sources[] = {
                CLKSRC_MII0_RX_CLK,
                CLKSRC_MII1_RX_CLK,
                CLKSRC_MII2_RX_CLK,
                CLKSRC_MII3_RX_CLK,
                CLKSRC_MII4_RX_CLK,
        };

        /* Payload for packed_buf */
        mii_rx_clk.clksrc    = clk_sources[port];
        mii_rx_clk.autoblock = 1;  /* Autoblock clk while changing clksrc */
        mii_rx_clk.pd        = 0;  /* Power Down off => enabled */
        sja1105_cgu_mii_control_packing(packed_buf, &mii_rx_clk, PACK);

        return sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                           regs->mii_rx_clk[port], packed_buf,
                                           SJA1105_SIZE_CGU_CMD);
}

static int
sja1105_cgu_mii_ext_tx_clk_config(struct sja1105_private *priv, int port)
{
        const struct sja1105_regs *regs = priv->info->regs;
        struct sja1105_cgu_mii_ctrl mii_ext_tx_clk;
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
        const int clk_sources[] = {
                CLKSRC_IDIV0,
                CLKSRC_IDIV1,
                CLKSRC_IDIV2,
                CLKSRC_IDIV3,
                CLKSRC_IDIV4,
        };

        /* Payload for packed_buf */
        mii_ext_tx_clk.clksrc    = clk_sources[port];
        mii_ext_tx_clk.autoblock = 1; /* Autoblock clk while changing clksrc */
        mii_ext_tx_clk.pd        = 0; /* Power Down off => enabled */
        sja1105_cgu_mii_control_packing(packed_buf, &mii_ext_tx_clk, PACK);

        return sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                           regs->mii_ext_tx_clk[port],
                                           packed_buf, SJA1105_SIZE_CGU_CMD);
}

static int
sja1105_cgu_mii_ext_rx_clk_config(struct sja1105_private *priv, int port)
{
        const struct sja1105_regs *regs = priv->info->regs;
        struct sja1105_cgu_mii_ctrl mii_ext_rx_clk;
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
        const int clk_sources[] = {
                CLKSRC_IDIV0,
                CLKSRC_IDIV1,
                CLKSRC_IDIV2,
                CLKSRC_IDIV3,
                CLKSRC_IDIV4,
        };

        /* Payload for packed_buf */
        mii_ext_rx_clk.clksrc    = clk_sources[port];
        mii_ext_rx_clk.autoblock = 1; /* Autoblock clk while changing clksrc */
        mii_ext_rx_clk.pd        = 0; /* Power Down off => enabled */
        sja1105_cgu_mii_control_packing(packed_buf, &mii_ext_rx_clk, PACK);

        return sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                           regs->mii_ext_rx_clk[port],
                                           packed_buf, SJA1105_SIZE_CGU_CMD);
}

static int sja1105_mii_clocking_setup(struct sja1105_private *priv, int port,
                                      sja1105_mii_role_t role)
{
        struct device *dev = priv->ds->dev;
        int rc;

        dev_dbg(dev, "Configuring MII-%s clocking\n",
                (role == XMII_MAC) ? "MAC" : "PHY");
        /* If role is MAC, disable IDIV
         * If role is PHY, enable IDIV and configure for 1/1 divider
         */
        rc = sja1105_cgu_idiv_config(priv, port, (role == XMII_PHY), 1);
        if (rc < 0)
                return rc;

        /* Configure CLKSRC of MII_TX_CLK_n
         *   * If role is MAC, select TX_CLK_n
         *   * If role is PHY, select IDIV_n
         */
        rc = sja1105_cgu_mii_tx_clk_config(priv, port, role);
        if (rc < 0)
                return rc;

        /* Configure CLKSRC of MII_RX_CLK_n
         * Select RX_CLK_n
         */
        rc = sja1105_cgu_mii_rx_clk_config(priv, port);
        if (rc < 0)
                return rc;

        if (role == XMII_PHY) {
                /* Per MII spec, the PHY (which is us) drives the TX_CLK pin */

                /* Configure CLKSRC of EXT_TX_CLK_n
                 * Select IDIV_n
                 */
                rc = sja1105_cgu_mii_ext_tx_clk_config(priv, port);
                if (rc < 0)
                        return rc;

                /* Configure CLKSRC of EXT_RX_CLK_n
                 * Select IDIV_n
                 */
                rc = sja1105_cgu_mii_ext_rx_clk_config(priv, port);
                if (rc < 0)
                        return rc;
        }
        return 0;
}

static void
sja1105_cgu_pll_control_packing(void *buf, struct sja1105_cgu_pll_ctrl *cmd,
                                enum packing_op op)
{
        const int size = 4;

        sja1105_packing(buf, &cmd->pllclksrc, 28, 24, size, op);
        sja1105_packing(buf, &cmd->msel,      23, 16, size, op);
        sja1105_packing(buf, &cmd->autoblock, 11, 11, size, op);
        sja1105_packing(buf, &cmd->psel,       9,  8, size, op);
        sja1105_packing(buf, &cmd->direct,     7,  7, size, op);
        sja1105_packing(buf, &cmd->fbsel,      6,  6, size, op);
        sja1105_packing(buf, &cmd->bypass,     1,  1, size, op);
        sja1105_packing(buf, &cmd->pd,         0,  0, size, op);
}

static int sja1105_cgu_rgmii_tx_clk_config(struct sja1105_private *priv,
                                           int port, sja1105_speed_t speed)
{
        const struct sja1105_regs *regs = priv->info->regs;
        struct sja1105_cgu_mii_ctrl txc;
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
        int clksrc;

        if (speed == SJA1105_SPEED_1000MBPS) {
                clksrc = CLKSRC_PLL0;
        } else {
                int clk_sources[] = {CLKSRC_IDIV0, CLKSRC_IDIV1, CLKSRC_IDIV2,
                                     CLKSRC_IDIV3, CLKSRC_IDIV4};
                clksrc = clk_sources[port];
        }

        /* RGMII: 125MHz for 1000, 25MHz for 100, 2.5MHz for 10 */
        txc.clksrc = clksrc;
        /* Autoblock clk while changing clksrc */
        txc.autoblock = 1;
        /* Power Down off => enabled */
        txc.pd = 0;
        sja1105_cgu_mii_control_packing(packed_buf, &txc, PACK);

        return sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                           regs->rgmii_tx_clk[port],
                                           packed_buf, SJA1105_SIZE_CGU_CMD);
}

/* AGU */
static void
sja1105_cfg_pad_mii_tx_packing(void *buf, struct sja1105_cfg_pad_mii_tx *cmd,
                               enum packing_op op)
{
        const int size = 4;

        sja1105_packing(buf, &cmd->d32_os,   28, 27, size, op);
        sja1105_packing(buf, &cmd->d32_ipud, 25, 24, size, op);
        sja1105_packing(buf, &cmd->d10_os,   20, 19, size, op);
        sja1105_packing(buf, &cmd->d10_ipud, 17, 16, size, op);
        sja1105_packing(buf, &cmd->ctrl_os,  12, 11, size, op);
        sja1105_packing(buf, &cmd->ctrl_ipud, 9,  8, size, op);
        sja1105_packing(buf, &cmd->clk_os,    4,  3, size, op);
        sja1105_packing(buf, &cmd->clk_ih,    2,  2, size, op);
        sja1105_packing(buf, &cmd->clk_ipud,  1,  0, size, op);
}

static int sja1105_rgmii_cfg_pad_tx_config(struct sja1105_private *priv,
                                           int port)
{
        const struct sja1105_regs *regs = priv->info->regs;
        struct sja1105_cfg_pad_mii_tx pad_mii_tx;
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};

        /* Payload */
        pad_mii_tx.d32_os    = 3; /* TXD[3:2] output stage: */
                                  /*          high noise/high speed */
        pad_mii_tx.d10_os    = 3; /* TXD[1:0] output stage: */
                                  /*          high noise/high speed */
        pad_mii_tx.d32_ipud  = 2; /* TXD[3:2] input stage: */
                                  /*          plain input (default) */
        pad_mii_tx.d10_ipud  = 2; /* TXD[1:0] input stage: */
                                  /*          plain input (default) */
        pad_mii_tx.ctrl_os   = 3; /* TX_CTL / TX_ER output stage */
        pad_mii_tx.ctrl_ipud = 2; /* TX_CTL / TX_ER input stage (default) */
        pad_mii_tx.clk_os    = 3; /* TX_CLK output stage */
        pad_mii_tx.clk_ih    = 0; /* TX_CLK input hysteresis (default) */
        pad_mii_tx.clk_ipud  = 2; /* TX_CLK input stage (default) */
        sja1105_cfg_pad_mii_tx_packing(packed_buf, &pad_mii_tx, PACK);

        return sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                           regs->pad_mii_tx[port],
                                           packed_buf, SJA1105_SIZE_CGU_CMD);
}

static void
sja1105_cfg_pad_mii_id_packing(void *buf, struct sja1105_cfg_pad_mii_id *cmd,
                               enum packing_op op)
{
        const int size = SJA1105_SIZE_CGU_CMD;

        sja1105_packing(buf, &cmd->rxc_stable_ovr, 15, 15, size, op);
        sja1105_packing(buf, &cmd->rxc_delay,      14, 10, size, op);
        sja1105_packing(buf, &cmd->rxc_bypass,      9,  9, size, op);
        sja1105_packing(buf, &cmd->rxc_pd,          8,  8, size, op);
        sja1105_packing(buf, &cmd->txc_stable_ovr,  7,  7, size, op);
        sja1105_packing(buf, &cmd->txc_delay,       6,  2, size, op);
        sja1105_packing(buf, &cmd->txc_bypass,      1,  1, size, op);
        sja1105_packing(buf, &cmd->txc_pd,          0,  0, size, op);
}

/* Valid range in degrees is an integer between 73.8 and 101.7 */
static inline u64 sja1105_rgmii_delay(u64 phase)
{
        /* UM11040.pdf: The delay in degree phase is 73.8 + delay_tune * 0.9.
         * To avoid floating point operations we'll multiply by 10
         * and get 1 decimal point precision.
         */
        phase *= 10;
        return (phase - 738) / 9;
}

/* The RGMII delay setup procedure is 2-step and gets called upon each
 * .phylink_mac_config. Both are strategic.
 * The reason is that the RX Tunable Delay Line of the SJA1105 MAC has issues
 * with recovering from a frequency change of the link partner's RGMII clock.
 * The easiest way to recover from this is to temporarily power down the TDL,
 * as it will re-lock at the new frequency afterwards.
 */
int sja1105pqrs_setup_rgmii_delay(const void *ctx, int port)
{
        const struct sja1105_private *priv = ctx;
        const struct sja1105_regs *regs = priv->info->regs;
        struct sja1105_cfg_pad_mii_id pad_mii_id = {0};
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
        int rc;

        if (priv->rgmii_rx_delay[port])
                pad_mii_id.rxc_delay = sja1105_rgmii_delay(90);
        if (priv->rgmii_tx_delay[port])
                pad_mii_id.txc_delay = sja1105_rgmii_delay(90);

        /* Stage 1: Turn the RGMII delay lines off. */
        pad_mii_id.rxc_bypass = 1;
        pad_mii_id.rxc_pd = 1;
        pad_mii_id.txc_bypass = 1;
        pad_mii_id.txc_pd = 1;
        sja1105_cfg_pad_mii_id_packing(packed_buf, &pad_mii_id, PACK);

        rc = sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                         regs->pad_mii_id[port],
                                         packed_buf, SJA1105_SIZE_CGU_CMD);
        if (rc < 0)
                return rc;

        /* Stage 2: Turn the RGMII delay lines on. */
        if (priv->rgmii_rx_delay[port]) {
                pad_mii_id.rxc_bypass = 0;
                pad_mii_id.rxc_pd = 0;
        }
        if (priv->rgmii_tx_delay[port]) {
                pad_mii_id.txc_bypass = 0;
                pad_mii_id.txc_pd = 0;
        }
        sja1105_cfg_pad_mii_id_packing(packed_buf, &pad_mii_id, PACK);

        return sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                           regs->pad_mii_id[port],
                                           packed_buf, SJA1105_SIZE_CGU_CMD);
}

static int sja1105_rgmii_clocking_setup(struct sja1105_private *priv, int port,
                                        sja1105_mii_role_t role)
{
        struct device *dev = priv->ds->dev;
        struct sja1105_mac_config_entry *mac;
        sja1105_speed_t speed;
        int rc;

        mac = priv->static_config.tables[BLK_IDX_MAC_CONFIG].entries;
        speed = mac[port].speed;

        dev_dbg(dev, "Configuring port %d RGMII at speed %dMbps\n",
                port, speed);

        switch (speed) {
        case SJA1105_SPEED_1000MBPS:
                /* 1000Mbps, IDIV disabled (125 MHz) */
                rc = sja1105_cgu_idiv_config(priv, port, false, 1);
                break;
        case SJA1105_SPEED_100MBPS:
                /* 100Mbps, IDIV enabled, divide by 1 (25 MHz) */
                rc = sja1105_cgu_idiv_config(priv, port, true, 1);
                break;
        case SJA1105_SPEED_10MBPS:
                /* 10Mbps, IDIV enabled, divide by 10 (2.5 MHz) */
                rc = sja1105_cgu_idiv_config(priv, port, true, 10);
                break;
        case SJA1105_SPEED_AUTO:
                /* Skip CGU configuration if there is no speed available
                 * (e.g. link is not established yet)
                 */
                dev_dbg(dev, "Speed not available, skipping CGU config\n");
                return 0;
        default:
                rc = -EINVAL;
        }

        if (rc < 0) {
                dev_err(dev, "Failed to configure idiv\n");
                return rc;
        }
        rc = sja1105_cgu_rgmii_tx_clk_config(priv, port, speed);
        if (rc < 0) {
                dev_err(dev, "Failed to configure RGMII Tx clock\n");
                return rc;
        }
        rc = sja1105_rgmii_cfg_pad_tx_config(priv, port);
        if (rc < 0) {
                dev_err(dev, "Failed to configure Tx pad registers\n");
                return rc;
        }
        if (!priv->info->setup_rgmii_delay)
                return 0;
        /* The role has no hardware effect for RGMII. However we use it as
         * a proxy for this interface being a MAC-to-MAC connection, with
         * the RGMII internal delays needing to be applied by us.
         */
        if (role == XMII_MAC)
                return 0;

        return priv->info->setup_rgmii_delay(priv, port);
}

static int sja1105_cgu_rmii_ref_clk_config(struct sja1105_private *priv,
                                           int port)
{
        const struct sja1105_regs *regs = priv->info->regs;
        struct sja1105_cgu_mii_ctrl ref_clk;
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
        const int clk_sources[] = {
                CLKSRC_MII0_TX_CLK,
                CLKSRC_MII1_TX_CLK,
                CLKSRC_MII2_TX_CLK,
                CLKSRC_MII3_TX_CLK,
                CLKSRC_MII4_TX_CLK,
        };

        /* Payload for packed_buf */
        ref_clk.clksrc    = clk_sources[port];
        ref_clk.autoblock = 1;      /* Autoblock clk while changing clksrc */
        ref_clk.pd        = 0;      /* Power Down off => enabled */
        sja1105_cgu_mii_control_packing(packed_buf, &ref_clk, PACK);

        return sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                           regs->rmii_ref_clk[port],
                                           packed_buf, SJA1105_SIZE_CGU_CMD);
}

static int
sja1105_cgu_rmii_ext_tx_clk_config(struct sja1105_private *priv, int port)
{
        const struct sja1105_regs *regs = priv->info->regs;
        struct sja1105_cgu_mii_ctrl ext_tx_clk;
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};

        /* Payload for packed_buf */
        ext_tx_clk.clksrc    = CLKSRC_PLL1;
        ext_tx_clk.autoblock = 1;   /* Autoblock clk while changing clksrc */
        ext_tx_clk.pd        = 0;   /* Power Down off => enabled */
        sja1105_cgu_mii_control_packing(packed_buf, &ext_tx_clk, PACK);

        return sja1105_spi_send_packed_buf(priv, SPI_WRITE,
                                           regs->rmii_ext_tx_clk[port],
                                           packed_buf, SJA1105_SIZE_CGU_CMD);
}

static int sja1105_cgu_rmii_pll_config(struct sja1105_private *priv)
{
        const struct sja1105_regs *regs = priv->info->regs;
        u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
        struct sja1105_cgu_pll_ctrl pll = {0};
        struct device *dev = priv->ds->dev;
        int rc;

        /* PLL1 must be enabled and output 50 Mhz.
         * This is done by writing first 0x0A010941 to
         * the PLL_1_C register and then deasserting
         * power down (PD) 0x0A010940.
         */

        /* Step 1: PLL1 setup for 50Mhz */
        pll.pllclksrc = 0xA;
        pll.msel      = 0x1;
        pll.autoblock = 0x1;
        pll.psel      = 0x1;
        pll.direct    = 0x0;
        pll.fbsel     = 0x1;
        pll.bypass    = 0x0;
        pll.pd        = 0x1;

        sja1105_cgu_pll_control_packing(packed_buf, &pll, PACK);
        rc = sja1105_spi_send_packed_buf(priv, SPI_WRITE, regs->rmii_pll1,
                                         packed_buf, SJA1105_SIZE_CGU_CMD);
        if (rc < 0) {
                dev_err(dev, "failed to configure PLL1 for 50MHz\n");
                return rc;
        }

        /* Step 2: Enable PLL1 */
        pll.pd = 0x0;

        sja1105_cgu_pll_control_packing(packed_buf, &pll, PACK);
        rc = sja1105_spi_send_packed_buf(priv, SPI_WRITE, regs->rmii_pll1,
                                         packed_buf, SJA1105_SIZE_CGU_CMD);
        if (rc < 0) {
                dev_err(dev, "failed to enable PLL1\n");
                return rc;
        }
        return rc;
}

static int sja1105_rmii_clocking_setup(struct sja1105_private *priv, int port,
                                       sja1105_mii_role_t role)
{
        struct device *dev = priv->ds->dev;
        int rc;

        dev_dbg(dev, "Configuring RMII-%s clocking\n",
                (role == XMII_MAC) ? "MAC" : "PHY");
        /* AH1601.pdf chapter 2.5.1. Sources */
        if (role == XMII_MAC) {
                /* Configure and enable PLL1 for 50Mhz output */
                rc = sja1105_cgu_rmii_pll_config(priv);
                if (rc < 0)
                        return rc;
        }
        /* Disable IDIV for this port */
        rc = sja1105_cgu_idiv_config(priv, port, false, 1);
        if (rc < 0)
                return rc;
        /* Source to sink mappings */
        rc = sja1105_cgu_rmii_ref_clk_config(priv, port);
        if (rc < 0)
                return rc;
        if (role == XMII_MAC) {
                rc = sja1105_cgu_rmii_ext_tx_clk_config(priv, port);
                if (rc < 0)
                        return rc;
        }
        return 0;
}

int sja1105_clocking_setup_port(struct sja1105_private *priv, int port)
{
        struct sja1105_xmii_params_entry *mii;
        struct device *dev = priv->ds->dev;
        sja1105_phy_interface_t phy_mode;
        sja1105_mii_role_t role;
        int rc;

        mii = priv->static_config.tables[BLK_IDX_XMII_PARAMS].entries;

        /* RGMII etc */
        phy_mode = mii->xmii_mode[port];
        /* MAC or PHY, for applicable types (not RGMII) */
        role = mii->phy_mac[port];

        switch (phy_mode) {
        case XMII_MODE_MII:
                rc = sja1105_mii_clocking_setup(priv, port, role);
                break;
        case XMII_MODE_RMII:
                rc = sja1105_rmii_clocking_setup(priv, port, role);
                break;
        case XMII_MODE_RGMII:
                rc = sja1105_rgmii_clocking_setup(priv, port, role);
                break;
        default:
                dev_err(dev, "Invalid interface mode specified: %d\n",
                        phy_mode);
                return -EINVAL;
        }
        if (rc)
                dev_err(dev, "Clocking setup for port %d failed: %d\n",
                        port, rc);
        return rc;
}

int sja1105_clocking_setup(struct sja1105_private *priv)
{
        int port, rc;

        for (port = 0; port < SJA1105_NUM_PORTS; port++) {
                rc = sja1105_clocking_setup_port(priv, port);
                if (rc < 0)
                        return rc;
        }
        return 0;
}