// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Arasan Secure Digital Host Controller Interface.
 * Copyright (C) 2011 - 2012 Michal Simek <monstr@monstr.eu>
 * Copyright (c) 2012 Wind River Systems, Inc.
 * Copyright (C) 2013 Pengutronix e.K.
 * Copyright (C) 2013 Xilinx Inc.
 *
 * Based on sdhci-of-esdhc.c
 *
 * Copyright (c) 2007 Freescale Semiconductor, Inc.
 * Copyright (c) 2009 MontaVista Software, Inc.
 *
 * Authors: Xiaobo Xie <X.Xie@freescale.com>
 *          Anton Vorontsov <avorontsov@ru.mvista.com>
 */

#include <linux/clk-provider.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include <linux/of.h>
#include <linux/firmware/xlnx-zynqmp.h>
#include <linux/pinctrl/consumer.h>

#include "cqhci.h"
#include "sdhci-pltfm.h"

#define SDHCI_ARASAN_VENDOR_REGISTER    0x78

#define SDHCI_ARASAN_ITAPDLY_REGISTER   0xF0F8
#define SDHCI_ARASAN_OTAPDLY_REGISTER   0xF0FC

#define SDHCI_ARASAN_CQE_BASE_ADDR      0x200
#define VENDOR_ENHANCED_STROBE          BIT(0)

#define PHY_CLK_TOO_SLOW_HZ             400000

#define SDHCI_ITAPDLY_CHGWIN            0x200
#define SDHCI_ITAPDLY_ENABLE            0x100
#define SDHCI_OTAPDLY_ENABLE            0x40

/* Default settings for ZynqMP Clock Phases */
#define ZYNQMP_ICLK_PHASE {0, 63, 63, 0, 63,  0,   0, 183, 54,  0, 0}
#define ZYNQMP_OCLK_PHASE {0, 72, 60, 0, 60, 72, 135, 48, 72, 135, 0}

#define VERSAL_ICLK_PHASE {0, 132, 132, 0, 132, 0, 0, 162, 90, 0, 0}
#define VERSAL_OCLK_PHASE {0,  60, 48, 0, 48, 72, 90, 36, 60, 90, 0}

/*
 * On some SoCs the syscon area has a feature where the upper 16-bits of
 * each 32-bit register act as a write mask for the lower 16-bits.  This allows
 * atomic updates of the register without locking.  This macro is used on SoCs
 * that have that feature.
 */
#define HIWORD_UPDATE(val, mask, shift) \
                ((val) << (shift) | (mask) << ((shift) + 16))

/**
 * struct sdhci_arasan_soc_ctl_field - Field used in sdhci_arasan_soc_ctl_map
 *
 * @reg:        Offset within the syscon of the register containing this field
 * @width:      Number of bits for this field
 * @shift:      Bit offset within @reg of this field (or -1 if not avail)
 */
struct sdhci_arasan_soc_ctl_field {
        u32 reg;
        u16 width;
        s16 shift;
};

/**
 * struct sdhci_arasan_soc_ctl_map - Map in syscon to corecfg registers
 *
 * It's up to the licensee of the Arsan IP block to make these available
 * somewhere if needed.  Presumably these will be scattered somewhere that's
 * accessible via the syscon API.
 *
 * @baseclkfreq:        Where to find corecfg_baseclkfreq
 * @clockmultiplier:    Where to find corecfg_clockmultiplier
 * @hiword_update:      If true, use HIWORD_UPDATE to access the syscon
 */
struct sdhci_arasan_soc_ctl_map {
        struct sdhci_arasan_soc_ctl_field       baseclkfreq;
        struct sdhci_arasan_soc_ctl_field       clockmultiplier;
        bool                                    hiword_update;
};

/**
 * struct sdhci_arasan_clk_data
 * @sdcardclk_hw:       Struct for the clock we might provide to a PHY.
 * @sdcardclk:          Pointer to normal 'struct clock' for sdcardclk_hw.
 * @sampleclk_hw:       Struct for the clock we might provide to a PHY.
 * @sampleclk:          Pointer to normal 'struct clock' for sampleclk_hw.
 * @clk_phase_in:       Array of Input Clock Phase Delays for all speed modes
 * @clk_phase_out:      Array of Output Clock Phase Delays for all speed modes
 * @set_clk_delays:     Function pointer for setting Clock Delays
 * @clk_of_data:        Platform specific runtime clock data storage pointer
 */
struct sdhci_arasan_clk_data {
        struct clk_hw   sdcardclk_hw;
        struct clk      *sdcardclk;
        struct clk_hw   sampleclk_hw;
        struct clk      *sampleclk;
        int             clk_phase_in[MMC_TIMING_MMC_HS400 + 1];
        int             clk_phase_out[MMC_TIMING_MMC_HS400 + 1];
        void            (*set_clk_delays)(struct sdhci_host *host);
        void            *clk_of_data;
};

struct sdhci_arasan_zynqmp_clk_data {
        const struct zynqmp_eemi_ops *eemi_ops;
};

/**
 * struct sdhci_arasan_data
 * @host:               Pointer to the main SDHCI host structure.
 * @clk_ahb:            Pointer to the AHB clock
 * @phy:                Pointer to the generic phy
 * @is_phy_on:          True if the PHY is on; false if not.
 * @clk_data:           Struct for the Arasan Controller Clock Data.
 * @soc_ctl_base:       Pointer to regmap for syscon for soc_ctl registers.
 * @soc_ctl_map:        Map to get offsets into soc_ctl registers.
 * @pinctrl:            Per-device pin control state holder.
 * @pins_default:       Pinctrl state for a device.
 */
struct sdhci_arasan_data {
        struct sdhci_host *host;
        struct clk      *clk_ahb;
        struct phy      *phy;
        bool            is_phy_on;

        bool            has_cqe;
        struct sdhci_arasan_clk_data clk_data;

        struct regmap   *soc_ctl_base;
        const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
        struct pinctrl *pinctrl;
        struct pinctrl_state *pins_default;
        unsigned int    quirks; /* Arasan deviations from spec */

/* Controller does not have CD wired and will not function normally without */
#define SDHCI_ARASAN_QUIRK_FORCE_CDTEST BIT(0)
/* Controller immediately reports SDHCI_CLOCK_INT_STABLE after enabling the
 * internal clock even when the clock isn't stable */
#define SDHCI_ARASAN_QUIRK_CLOCK_UNSTABLE BIT(1)
/*
 * Some of the Arasan variations might not have timing requirements
 * met at 25MHz for Default Speed mode, those controllers work at
 * 19MHz instead
 */
#define SDHCI_ARASAN_QUIRK_CLOCK_25_BROKEN BIT(2)
};

struct sdhci_arasan_of_data {
        const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
        const struct sdhci_pltfm_data *pdata;
};

static const struct sdhci_arasan_soc_ctl_map rk3399_soc_ctl_map = {
        .baseclkfreq = { .reg = 0xf000, .width = 8, .shift = 8 },
        .clockmultiplier = { .reg = 0xf02c, .width = 8, .shift = 0},
        .hiword_update = true,
};

static const struct sdhci_arasan_soc_ctl_map intel_lgm_emmc_soc_ctl_map = {
        .baseclkfreq = { .reg = 0xa0, .width = 8, .shift = 2 },
        .clockmultiplier = { .reg = 0, .width = -1, .shift = -1 },
        .hiword_update = false,
};

/**
 * sdhci_arasan_syscon_write - Write to a field in soc_ctl registers
 *
 * This function allows writing to fields in sdhci_arasan_soc_ctl_map.
 * Note that if a field is specified as not available (shift < 0) then
 * this function will silently return an error code.  It will be noisy
 * and print errors for any other (unexpected) errors.
 *
 * @host:       The sdhci_host
 * @fld:        The field to write to
 * @val:        The value to write
 */
static int sdhci_arasan_syscon_write(struct sdhci_host *host,
                                   const struct sdhci_arasan_soc_ctl_field *fld,
                                   u32 val)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        struct regmap *soc_ctl_base = sdhci_arasan->soc_ctl_base;
        u32 reg = fld->reg;
        u16 width = fld->width;
        s16 shift = fld->shift;
        int ret;

        /*
         * Silently return errors for shift < 0 so caller doesn't have
         * to check for fields which are optional.  For fields that
         * are required then caller needs to do something special
         * anyway.
         */
        if (shift < 0)
                return -EINVAL;

        if (sdhci_arasan->soc_ctl_map->hiword_update)
                ret = regmap_write(soc_ctl_base, reg,
                                   HIWORD_UPDATE(val, GENMASK(width, 0),
                                                 shift));
        else
                ret = regmap_update_bits(soc_ctl_base, reg,
                                         GENMASK(shift + width, shift),
                                         val << shift);

        /* Yell about (unexpected) regmap errors */
        if (ret)
                pr_warn("%s: Regmap write fail: %d\n",
                         mmc_hostname(host->mmc), ret);

        return ret;
}

static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
        bool ctrl_phy = false;

        if (!IS_ERR(sdhci_arasan->phy)) {
                if (!sdhci_arasan->is_phy_on && clock <= PHY_CLK_TOO_SLOW_HZ) {
                        /*
                         * If PHY off, set clock to max speed and power PHY on.
                         *
                         * Although PHY docs apparently suggest power cycling
                         * when changing the clock the PHY doesn't like to be
                         * powered on while at low speeds like those used in ID
                         * mode.  Even worse is powering the PHY on while the
                         * clock is off.
                         *
                         * To workaround the PHY limitations, the best we can
                         * do is to power it on at a faster speed and then slam
                         * through low speeds without power cycling.
                         */
                        sdhci_set_clock(host, host->max_clk);
                        phy_power_on(sdhci_arasan->phy);
                        sdhci_arasan->is_phy_on = true;

                        /*
                         * We'll now fall through to the below case with
                         * ctrl_phy = false (so we won't turn off/on).  The
                         * sdhci_set_clock() will set the real clock.
                         */
                } else if (clock > PHY_CLK_TOO_SLOW_HZ) {
                        /*
                         * At higher clock speeds the PHY is fine being power
                         * cycled and docs say you _should_ power cycle when
                         * changing clock speeds.
                         */
                        ctrl_phy = true;
                }
        }

        if (ctrl_phy && sdhci_arasan->is_phy_on) {
                phy_power_off(sdhci_arasan->phy);
                sdhci_arasan->is_phy_on = false;
        }

        if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_CLOCK_25_BROKEN) {
                /*
                 * Some of the Arasan variations might not have timing
                 * requirements met at 25MHz for Default Speed mode,
                 * those controllers work at 19MHz instead.
                 */
                if (clock == DEFAULT_SPEED_MAX_DTR)
                        clock = (DEFAULT_SPEED_MAX_DTR * 19) / 25;
        }

        /* Set the Input and Output Clock Phase Delays */
        if (clk_data->set_clk_delays)
                clk_data->set_clk_delays(host);

        sdhci_set_clock(host, clock);

        if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_CLOCK_UNSTABLE)
                /*
                 * Some controllers immediately report SDHCI_CLOCK_INT_STABLE
                 * after enabling the clock even though the clock is not
                 * stable. Trying to use a clock without waiting here results
                 * in EILSEQ while detecting some older/slower cards. The
                 * chosen delay is the maximum delay from sdhci_set_clock.
                 */
                msleep(20);

        if (ctrl_phy) {
                phy_power_on(sdhci_arasan->phy);
                sdhci_arasan->is_phy_on = true;
        }
}

static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc,
                                        struct mmc_ios *ios)
{
        u32 vendor;
        struct sdhci_host *host = mmc_priv(mmc);

        vendor = sdhci_readl(host, SDHCI_ARASAN_VENDOR_REGISTER);
        if (ios->enhanced_strobe)
                vendor |= VENDOR_ENHANCED_STROBE;
        else
                vendor &= ~VENDOR_ENHANCED_STROBE;

        sdhci_writel(host, vendor, SDHCI_ARASAN_VENDOR_REGISTER);
}

static void sdhci_arasan_reset(struct sdhci_host *host, u8 mask)
{
        u8 ctrl;
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);

        sdhci_reset(host, mask);

        if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_FORCE_CDTEST) {
                ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
                ctrl |= SDHCI_CTRL_CDTEST_INS | SDHCI_CTRL_CDTEST_EN;
                sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
        }
}

static int sdhci_arasan_voltage_switch(struct mmc_host *mmc,
                                       struct mmc_ios *ios)
{
        switch (ios->signal_voltage) {
        case MMC_SIGNAL_VOLTAGE_180:
                /*
                 * Plese don't switch to 1V8 as arasan,5.1 doesn't
                 * actually refer to this setting to indicate the
                 * signal voltage and the state machine will be broken
                 * actually if we force to enable 1V8. That's something
                 * like broken quirk but we could work around here.
                 */
                return 0;
        case MMC_SIGNAL_VOLTAGE_330:
        case MMC_SIGNAL_VOLTAGE_120:
                /* We don't support 3V3 and 1V2 */
                break;
        }

        return -EINVAL;
}

static void sdhci_arasan_set_power(struct sdhci_host *host, unsigned char mode,
                     unsigned short vdd)
{
        if (!IS_ERR(host->mmc->supply.vmmc)) {
                struct mmc_host *mmc = host->mmc;

                mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
        }
        sdhci_set_power_noreg(host, mode, vdd);
}

static const struct sdhci_ops sdhci_arasan_ops = {
        .set_clock = sdhci_arasan_set_clock,
        .get_max_clock = sdhci_pltfm_clk_get_max_clock,
        .get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
        .set_bus_width = sdhci_set_bus_width,
        .reset = sdhci_arasan_reset,
        .set_uhs_signaling = sdhci_set_uhs_signaling,
        .set_power = sdhci_arasan_set_power,
};

static const struct sdhci_pltfm_data sdhci_arasan_pdata = {
        .ops = &sdhci_arasan_ops,
        .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
        .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
                        SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN |
                        SDHCI_QUIRK2_STOP_WITH_TC,
};

static struct sdhci_arasan_of_data sdhci_arasan_data = {
        .pdata = &sdhci_arasan_pdata,
};

static const struct sdhci_pltfm_data sdhci_arasan_zynqmp_pdata = {
        .ops = &sdhci_arasan_ops,
        .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
                        SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN |
                        SDHCI_QUIRK2_STOP_WITH_TC,
};

static struct sdhci_arasan_of_data sdhci_arasan_zynqmp_data = {
        .pdata = &sdhci_arasan_zynqmp_pdata,
};

static u32 sdhci_arasan_cqhci_irq(struct sdhci_host *host, u32 intmask)
{
        int cmd_error = 0;
        int data_error = 0;

        if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error))
                return intmask;

        cqhci_irq(host->mmc, intmask, cmd_error, data_error);

        return 0;
}

static void sdhci_arasan_dumpregs(struct mmc_host *mmc)
{
        sdhci_dumpregs(mmc_priv(mmc));
}

static void sdhci_arasan_cqe_enable(struct mmc_host *mmc)
{
        struct sdhci_host *host = mmc_priv(mmc);
        u32 reg;

        reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
        while (reg & SDHCI_DATA_AVAILABLE) {
                sdhci_readl(host, SDHCI_BUFFER);
                reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
        }

        sdhci_cqe_enable(mmc);
}

static const struct cqhci_host_ops sdhci_arasan_cqhci_ops = {
        .enable         = sdhci_arasan_cqe_enable,
        .disable        = sdhci_cqe_disable,
        .dumpregs       = sdhci_arasan_dumpregs,
};

static const struct sdhci_ops sdhci_arasan_cqe_ops = {
        .set_clock = sdhci_arasan_set_clock,
        .get_max_clock = sdhci_pltfm_clk_get_max_clock,
        .get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
        .set_bus_width = sdhci_set_bus_width,
        .reset = sdhci_arasan_reset,
        .set_uhs_signaling = sdhci_set_uhs_signaling,
        .set_power = sdhci_arasan_set_power,
        .irq = sdhci_arasan_cqhci_irq,
};

static const struct sdhci_pltfm_data sdhci_arasan_cqe_pdata = {
        .ops = &sdhci_arasan_cqe_ops,
        .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
        .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
                        SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
};

static struct sdhci_arasan_of_data sdhci_arasan_rk3399_data = {
        .soc_ctl_map = &rk3399_soc_ctl_map,
        .pdata = &sdhci_arasan_cqe_pdata,
};

static struct sdhci_arasan_of_data intel_lgm_emmc_data = {
        .soc_ctl_map = &intel_lgm_emmc_soc_ctl_map,
        .pdata = &sdhci_arasan_cqe_pdata,
};

#ifdef CONFIG_PM_SLEEP
/**
 * sdhci_arasan_suspend - Suspend method for the driver
 * @dev:        Address of the device structure
 * Returns 0 on success and error value on error
 *
 * Put the device in a low power state.
 */
static int sdhci_arasan_suspend(struct device *dev)
{
        struct sdhci_host *host = dev_get_drvdata(dev);
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        int ret;

        if (host->tuning_mode != SDHCI_TUNING_MODE_3)
                mmc_retune_needed(host->mmc);

        if (sdhci_arasan->has_cqe) {
                ret = cqhci_suspend(host->mmc);
                if (ret)
                        return ret;
        }

        ret = sdhci_suspend_host(host);
        if (ret)
                return ret;

        if (!IS_ERR(sdhci_arasan->phy) && sdhci_arasan->is_phy_on) {
                ret = phy_power_off(sdhci_arasan->phy);
                if (ret) {
                        dev_err(dev, "Cannot power off phy.\n");
                        sdhci_resume_host(host);
                        return ret;
                }
                sdhci_arasan->is_phy_on = false;
        }

        clk_disable(pltfm_host->clk);
        clk_disable(sdhci_arasan->clk_ahb);

        return 0;
}

/**
 * sdhci_arasan_resume - Resume method for the driver
 * @dev:        Address of the device structure
 * Returns 0 on success and error value on error
 *
 * Resume operation after suspend
 */
static int sdhci_arasan_resume(struct device *dev)
{
        struct sdhci_host *host = dev_get_drvdata(dev);
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        int ret;

        ret = clk_enable(sdhci_arasan->clk_ahb);
        if (ret) {
                dev_err(dev, "Cannot enable AHB clock.\n");
                return ret;
        }

        ret = clk_enable(pltfm_host->clk);
        if (ret) {
                dev_err(dev, "Cannot enable SD clock.\n");
                return ret;
        }

        if (!IS_ERR(sdhci_arasan->phy) && host->mmc->actual_clock) {
                ret = phy_power_on(sdhci_arasan->phy);
                if (ret) {
                        dev_err(dev, "Cannot power on phy.\n");
                        return ret;
                }
                sdhci_arasan->is_phy_on = true;
        }

        ret = sdhci_resume_host(host);
        if (ret) {
                dev_err(dev, "Cannot resume host.\n");
                return ret;
        }

        if (sdhci_arasan->has_cqe)
                return cqhci_resume(host->mmc);

        return 0;
}
#endif /* ! CONFIG_PM_SLEEP */

static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
                         sdhci_arasan_resume);

static const struct of_device_id sdhci_arasan_of_match[] = {
        /* SoC-specific compatible strings w/ soc_ctl_map */
        {
                .compatible = "rockchip,rk3399-sdhci-5.1",
                .data = &sdhci_arasan_rk3399_data,
        },
        {
                .compatible = "intel,lgm-sdhci-5.1-emmc",
                .data = &intel_lgm_emmc_data,
        },
        /* Generic compatible below here */
        {
                .compatible = "arasan,sdhci-8.9a",
                .data = &sdhci_arasan_data,
        },
        {
                .compatible = "arasan,sdhci-5.1",
                .data = &sdhci_arasan_data,
        },
        {
                .compatible = "arasan,sdhci-4.9a",
                .data = &sdhci_arasan_data,
        },
        {
                .compatible = "xlnx,zynqmp-8.9a",
                .data = &sdhci_arasan_zynqmp_data,
        },
        {
                .compatible = "xlnx,versal-8.9a",
                .data = &sdhci_arasan_zynqmp_data,
        },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);

/**
 * sdhci_arasan_sdcardclk_recalc_rate - Return the card clock rate
 *
 * Return the current actual rate of the SD card clock.  This can be used
 * to communicate with out PHY.
 *
 * @hw:                 Pointer to the hardware clock structure.
 * @parent_rate         The parent rate (should be rate of clk_xin).
 * Returns the card clock rate.
 */
static unsigned long sdhci_arasan_sdcardclk_recalc_rate(struct clk_hw *hw,
                                                      unsigned long parent_rate)

{
        struct sdhci_arasan_clk_data *clk_data =
                container_of(hw, struct sdhci_arasan_clk_data, sdcardclk_hw);
        struct sdhci_arasan_data *sdhci_arasan =
                container_of(clk_data, struct sdhci_arasan_data, clk_data);
        struct sdhci_host *host = sdhci_arasan->host;

        return host->mmc->actual_clock;
}

static const struct clk_ops arasan_sdcardclk_ops = {
        .recalc_rate = sdhci_arasan_sdcardclk_recalc_rate,
};

/**
 * sdhci_arasan_sampleclk_recalc_rate - Return the sampling clock rate
 *
 * Return the current actual rate of the sampling clock.  This can be used
 * to communicate with out PHY.
 *
 * @hw:                 Pointer to the hardware clock structure.
 * @parent_rate         The parent rate (should be rate of clk_xin).
 * Returns the sample clock rate.
 */
static unsigned long sdhci_arasan_sampleclk_recalc_rate(struct clk_hw *hw,
                                                      unsigned long parent_rate)

{
        struct sdhci_arasan_clk_data *clk_data =
                container_of(hw, struct sdhci_arasan_clk_data, sampleclk_hw);
        struct sdhci_arasan_data *sdhci_arasan =
                container_of(clk_data, struct sdhci_arasan_data, clk_data);
        struct sdhci_host *host = sdhci_arasan->host;

        return host->mmc->actual_clock;
}

static const struct clk_ops arasan_sampleclk_ops = {
        .recalc_rate = sdhci_arasan_sampleclk_recalc_rate,
};

/**
 * sdhci_zynqmp_sdcardclk_set_phase - Set the SD Output Clock Tap Delays
 *
 * Set the SD Output Clock Tap Delays for Output path
 *
 * @hw:                 Pointer to the hardware clock structure.
 * @degrees             The clock phase shift between 0 - 359.
 * Return: 0 on success and error value on error
 */
static int sdhci_zynqmp_sdcardclk_set_phase(struct clk_hw *hw, int degrees)
{
        struct sdhci_arasan_clk_data *clk_data =
                container_of(hw, struct sdhci_arasan_clk_data, sdcardclk_hw);
        struct sdhci_arasan_data *sdhci_arasan =
                container_of(clk_data, struct sdhci_arasan_data, clk_data);
        struct sdhci_host *host = sdhci_arasan->host;
        struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data =
                clk_data->clk_of_data;
        const struct zynqmp_eemi_ops *eemi_ops = zynqmp_clk_data->eemi_ops;
        const char *clk_name = clk_hw_get_name(hw);
        u32 node_id = !strcmp(clk_name, "clk_out_sd0") ? NODE_SD_0 : NODE_SD_1;
        u8 tap_delay, tap_max = 0;
        int ret;

        /*
         * This is applicable for SDHCI_SPEC_300 and above
         * ZynqMP does not set phase for <=25MHz clock.
         * If degrees is zero, no need to do anything.
         */
        if (host->version < SDHCI_SPEC_300 ||
            host->timing == MMC_TIMING_LEGACY ||
            host->timing == MMC_TIMING_UHS_SDR12 || !degrees)
                return 0;

        switch (host->timing) {
        case MMC_TIMING_MMC_HS:
        case MMC_TIMING_SD_HS:
        case MMC_TIMING_UHS_SDR25:
        case MMC_TIMING_UHS_DDR50:
        case MMC_TIMING_MMC_DDR52:
                /* For 50MHz clock, 30 Taps are available */
                tap_max = 30;
                break;
        case MMC_TIMING_UHS_SDR50:
                /* For 100MHz clock, 15 Taps are available */
                tap_max = 15;
                break;
        case MMC_TIMING_UHS_SDR104:
        case MMC_TIMING_MMC_HS200:
                /* For 200MHz clock, 8 Taps are available */
                tap_max = 8;
        default:
                break;
        }

        tap_delay = (degrees * tap_max) / 360;

        /* Set the Clock Phase */
        ret = eemi_ops->ioctl(node_id, IOCTL_SET_SD_TAPDELAY,
                              PM_TAPDELAY_OUTPUT, tap_delay, NULL);
        if (ret)
                pr_err("Error setting Output Tap Delay\n");

        return ret;
}

static const struct clk_ops zynqmp_sdcardclk_ops = {
        .recalc_rate = sdhci_arasan_sdcardclk_recalc_rate,
        .set_phase = sdhci_zynqmp_sdcardclk_set_phase,
};

/**
 * sdhci_zynqmp_sampleclk_set_phase - Set the SD Input Clock Tap Delays
 *
 * Set the SD Input Clock Tap Delays for Input path
 *
 * @hw:                 Pointer to the hardware clock structure.
 * @degrees             The clock phase shift between 0 - 359.
 * Return: 0 on success and error value on error
 */
static int sdhci_zynqmp_sampleclk_set_phase(struct clk_hw *hw, int degrees)
{
        struct sdhci_arasan_clk_data *clk_data =
                container_of(hw, struct sdhci_arasan_clk_data, sampleclk_hw);
        struct sdhci_arasan_data *sdhci_arasan =
                container_of(clk_data, struct sdhci_arasan_data, clk_data);
        struct sdhci_host *host = sdhci_arasan->host;
        struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data =
                clk_data->clk_of_data;
        const struct zynqmp_eemi_ops *eemi_ops = zynqmp_clk_data->eemi_ops;
        const char *clk_name = clk_hw_get_name(hw);
        u32 node_id = !strcmp(clk_name, "clk_in_sd0") ? NODE_SD_0 : NODE_SD_1;
        u8 tap_delay, tap_max = 0;
        int ret;

        /*
         * This is applicable for SDHCI_SPEC_300 and above
         * ZynqMP does not set phase for <=25MHz clock.
         * If degrees is zero, no need to do anything.
         */
        if (host->version < SDHCI_SPEC_300 ||
            host->timing == MMC_TIMING_LEGACY ||
            host->timing == MMC_TIMING_UHS_SDR12 || !degrees)
                return 0;

        switch (host->timing) {
        case MMC_TIMING_MMC_HS:
        case MMC_TIMING_SD_HS:
        case MMC_TIMING_UHS_SDR25:
        case MMC_TIMING_UHS_DDR50:
        case MMC_TIMING_MMC_DDR52:
                /* For 50MHz clock, 120 Taps are available */
                tap_max = 120;
                break;
        case MMC_TIMING_UHS_SDR50:
                /* For 100MHz clock, 60 Taps are available */
                tap_max = 60;
                break;
        case MMC_TIMING_UHS_SDR104:
        case MMC_TIMING_MMC_HS200:
                /* For 200MHz clock, 30 Taps are available */
                tap_max = 30;
        default:
                break;
        }

        tap_delay = (degrees * tap_max) / 360;

        /* Set the Clock Phase */
        ret = eemi_ops->ioctl(node_id, IOCTL_SET_SD_TAPDELAY,
                              PM_TAPDELAY_INPUT, tap_delay, NULL);
        if (ret)
                pr_err("Error setting Input Tap Delay\n");

        return ret;
}

static const struct clk_ops zynqmp_sampleclk_ops = {
        .recalc_rate = sdhci_arasan_sampleclk_recalc_rate,
        .set_phase = sdhci_zynqmp_sampleclk_set_phase,
};

/**
 * sdhci_versal_sdcardclk_set_phase - Set the SD Output Clock Tap Delays
 *
 * Set the SD Output Clock Tap Delays for Output path
 *
 * @hw:                 Pointer to the hardware clock structure.
 * @degrees             The clock phase shift between 0 - 359.
 * Return: 0 on success and error value on error
 */
static int sdhci_versal_sdcardclk_set_phase(struct clk_hw *hw, int degrees)
{
        struct sdhci_arasan_clk_data *clk_data =
                container_of(hw, struct sdhci_arasan_clk_data, sdcardclk_hw);
        struct sdhci_arasan_data *sdhci_arasan =
                container_of(clk_data, struct sdhci_arasan_data, clk_data);
        struct sdhci_host *host = sdhci_arasan->host;
        u8 tap_delay, tap_max = 0;
        int ret;

        /*
         * This is applicable for SDHCI_SPEC_300 and above
         * Versal does not set phase for <=25MHz clock.
         * If degrees is zero, no need to do anything.
         */
        if (host->version < SDHCI_SPEC_300 ||
            host->timing == MMC_TIMING_LEGACY ||
            host->timing == MMC_TIMING_UHS_SDR12 || !degrees)
                return 0;

        switch (host->timing) {
        case MMC_TIMING_MMC_HS:
        case MMC_TIMING_SD_HS:
        case MMC_TIMING_UHS_SDR25:
        case MMC_TIMING_UHS_DDR50:
        case MMC_TIMING_MMC_DDR52:
                /* For 50MHz clock, 30 Taps are available */
                tap_max = 30;
                break;
        case MMC_TIMING_UHS_SDR50:
                /* For 100MHz clock, 15 Taps are available */
                tap_max = 15;
                break;
        case MMC_TIMING_UHS_SDR104:
        case MMC_TIMING_MMC_HS200:
                /* For 200MHz clock, 8 Taps are available */
                tap_max = 8;
        default:
                break;
        }

        tap_delay = (degrees * tap_max) / 360;

        /* Set the Clock Phase */
        if (tap_delay) {
                u32 regval;

                regval = sdhci_readl(host, SDHCI_ARASAN_OTAPDLY_REGISTER);
                regval |= SDHCI_OTAPDLY_ENABLE;
                sdhci_writel(host, regval, SDHCI_ARASAN_OTAPDLY_REGISTER);
                regval |= tap_delay;
                sdhci_writel(host, regval, SDHCI_ARASAN_OTAPDLY_REGISTER);
        }

        return ret;
}

static const struct clk_ops versal_sdcardclk_ops = {
        .recalc_rate = sdhci_arasan_sdcardclk_recalc_rate,
        .set_phase = sdhci_versal_sdcardclk_set_phase,
};

/**
 * sdhci_versal_sampleclk_set_phase - Set the SD Input Clock Tap Delays
 *
 * Set the SD Input Clock Tap Delays for Input path
 *
 * @hw:                 Pointer to the hardware clock structure.
 * @degrees             The clock phase shift between 0 - 359.
 * Return: 0 on success and error value on error
 */
static int sdhci_versal_sampleclk_set_phase(struct clk_hw *hw, int degrees)
{
        struct sdhci_arasan_clk_data *clk_data =
                container_of(hw, struct sdhci_arasan_clk_data, sampleclk_hw);
        struct sdhci_arasan_data *sdhci_arasan =
                container_of(clk_data, struct sdhci_arasan_data, clk_data);
        struct sdhci_host *host = sdhci_arasan->host;
        u8 tap_delay, tap_max = 0;
        int ret;

        /*
         * This is applicable for SDHCI_SPEC_300 and above
         * Versal does not set phase for <=25MHz clock.
         * If degrees is zero, no need to do anything.
         */
        if (host->version < SDHCI_SPEC_300 ||
            host->timing == MMC_TIMING_LEGACY ||
            host->timing == MMC_TIMING_UHS_SDR12 || !degrees)
                return 0;

        switch (host->timing) {
        case MMC_TIMING_MMC_HS:
        case MMC_TIMING_SD_HS:
        case MMC_TIMING_UHS_SDR25:
        case MMC_TIMING_UHS_DDR50:
        case MMC_TIMING_MMC_DDR52:
                /* For 50MHz clock, 120 Taps are available */
                tap_max = 120;
                break;
        case MMC_TIMING_UHS_SDR50:
                /* For 100MHz clock, 60 Taps are available */
                tap_max = 60;
                break;
        case MMC_TIMING_UHS_SDR104:
        case MMC_TIMING_MMC_HS200:
                /* For 200MHz clock, 30 Taps are available */
                tap_max = 30;
        default:
                break;
        }

        tap_delay = (degrees * tap_max) / 360;

        /* Set the Clock Phase */
        if (tap_delay) {
                u32 regval;

                regval = sdhci_readl(host, SDHCI_ARASAN_ITAPDLY_REGISTER);
                regval |= SDHCI_ITAPDLY_CHGWIN;
                sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER);
                regval |= SDHCI_ITAPDLY_ENABLE;
                sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER);
                regval |= tap_delay;
                sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER);
                regval &= ~SDHCI_ITAPDLY_CHGWIN;
                sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER);
        }

        return ret;
}

static const struct clk_ops versal_sampleclk_ops = {
        .recalc_rate = sdhci_arasan_sampleclk_recalc_rate,
        .set_phase = sdhci_versal_sampleclk_set_phase,
};
static void arasan_zynqmp_dll_reset(struct sdhci_host *host, u32 deviceid)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data =
                sdhci_arasan->clk_data.clk_of_data;
        const struct zynqmp_eemi_ops *eemi_ops = zynqmp_clk_data->eemi_ops;
        u16 clk;
        unsigned long timeout;

        clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
        clk &= ~(SDHCI_CLOCK_CARD_EN | SDHCI_CLOCK_INT_EN);
        sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);

        /* Issue DLL Reset */
        eemi_ops->ioctl(deviceid, IOCTL_SD_DLL_RESET,
                        PM_DLL_RESET_PULSE, 0, NULL);

        clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
        clk |= SDHCI_CLOCK_INT_EN;
        sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);

        /* Wait max 20 ms */
        timeout = 20;
        while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
                                & SDHCI_CLOCK_INT_STABLE)) {
                if (timeout == 0) {
                        dev_err(mmc_dev(host->mmc),
                                ": Internal clock never stabilised.\n");
                        return;
                }
                timeout--;
                mdelay(1);
        }

        clk |= SDHCI_CLOCK_CARD_EN;
        sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
}

static int arasan_zynqmp_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
        struct sdhci_host *host = mmc_priv(mmc);
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        struct clk_hw *hw = &sdhci_arasan->clk_data.sdcardclk_hw;
        const char *clk_name = clk_hw_get_name(hw);
        u32 device_id = !strcmp(clk_name, "clk_out_sd0") ? NODE_SD_0 :
                                                           NODE_SD_1;
        int err;

        /* ZynqMP SD controller does not perform auto tuning in DDR50 mode */
        if (mmc->ios.timing == MMC_TIMING_UHS_DDR50)
                return 0;

        arasan_zynqmp_dll_reset(host, device_id);

        err = sdhci_execute_tuning(mmc, opcode);
        if (err)
                return err;

        arasan_zynqmp_dll_reset(host, device_id);

        return 0;
}

/**

 * sdhci_arasan_update_clockmultiplier - Set corecfg_clockmultiplier
 *
 * The corecfg_clockmultiplier is supposed to contain clock multiplier
 * value of programmable clock generator.
 *
 * NOTES:
 * - Many existing devices don't seem to do this and work fine.  To keep
 *   compatibility for old hardware where the device tree doesn't provide a
 *   register map, this function is a noop if a soc_ctl_map hasn't been provided
 *   for this platform.
 * - The value of corecfg_clockmultiplier should sync with that of corresponding
 *   value reading from sdhci_capability_register. So this function is called
 *   once at probe time and never called again.
 *
 * @host:               The sdhci_host
 */
static void sdhci_arasan_update_clockmultiplier(struct sdhci_host *host,
                                                u32 value)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        const struct sdhci_arasan_soc_ctl_map *soc_ctl_map =
                sdhci_arasan->soc_ctl_map;

        /* Having a map is optional */
        if (!soc_ctl_map)
                return;

        /* If we have a map, we expect to have a syscon */
        if (!sdhci_arasan->soc_ctl_base) {
                pr_warn("%s: Have regmap, but no soc-ctl-syscon\n",
                        mmc_hostname(host->mmc));
                return;
        }

        sdhci_arasan_syscon_write(host, &soc_ctl_map->clockmultiplier, value);
}

/**
 * sdhci_arasan_update_baseclkfreq - Set corecfg_baseclkfreq
 *
 * The corecfg_baseclkfreq is supposed to contain the MHz of clk_xin.  This
 * function can be used to make that happen.
 *
 * NOTES:
 * - Many existing devices don't seem to do this and work fine.  To keep
 *   compatibility for old hardware where the device tree doesn't provide a
 *   register map, this function is a noop if a soc_ctl_map hasn't been provided
 *   for this platform.
 * - It's assumed that clk_xin is not dynamic and that we use the SDHCI divider
 *   to achieve lower clock rates.  That means that this function is called once
 *   at probe time and never called again.
 *
 * @host:               The sdhci_host
 */
static void sdhci_arasan_update_baseclkfreq(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        const struct sdhci_arasan_soc_ctl_map *soc_ctl_map =
                sdhci_arasan->soc_ctl_map;
        u32 mhz = DIV_ROUND_CLOSEST(clk_get_rate(pltfm_host->clk), 1000000);

        /* Having a map is optional */
        if (!soc_ctl_map)
                return;

        /* If we have a map, we expect to have a syscon */
        if (!sdhci_arasan->soc_ctl_base) {
                pr_warn("%s: Have regmap, but no soc-ctl-syscon\n",
                        mmc_hostname(host->mmc));
                return;
        }

        sdhci_arasan_syscon_write(host, &soc_ctl_map->baseclkfreq, mhz);
}

static void sdhci_arasan_set_clk_delays(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;

        clk_set_phase(clk_data->sampleclk,
                      clk_data->clk_phase_in[host->timing]);
        clk_set_phase(clk_data->sdcardclk,
                      clk_data->clk_phase_out[host->timing]);
}

static void arasan_dt_read_clk_phase(struct device *dev,
                                     struct sdhci_arasan_clk_data *clk_data,
                                     unsigned int timing, const char *prop)
{
        struct device_node *np = dev->of_node;

        int clk_phase[2] = {0};

        /*
         * Read Tap Delay values from DT, if the DT does not contain the
         * Tap Values then use the pre-defined values.
         */
        if (of_property_read_variable_u32_array(np, prop, &clk_phase[0],
                                                2, 0)) {
                dev_dbg(dev, "Using predefined clock phase for %s = %d %d\n",
                        prop, clk_data->clk_phase_in[timing],
                        clk_data->clk_phase_out[timing]);
                return;
        }

        /* The values read are Input and Output Clock Delays in order */
        clk_data->clk_phase_in[timing] = clk_phase[0];
        clk_data->clk_phase_out[timing] = clk_phase[1];
}

/**
 * arasan_dt_parse_clk_phases - Read Clock Delay values from DT
 *
 * Called at initialization to parse the values of Clock Delays.
 *
 * @dev:                Pointer to our struct device.
 * @clk_data:           Pointer to the Clock Data structure
 */
static void arasan_dt_parse_clk_phases(struct device *dev,
                                       struct sdhci_arasan_clk_data *clk_data)
{
        int *iclk_phase, *oclk_phase;
        u32 mio_bank = 0;
        int i;

        /*
         * This has been kept as a pointer and is assigned a function here.
         * So that different controller variants can assign their own handling
         * function.
         */
        clk_data->set_clk_delays = sdhci_arasan_set_clk_delays;

        if (of_device_is_compatible(dev->of_node, "xlnx,zynqmp-8.9a")) {
                iclk_phase = (int [MMC_TIMING_MMC_HS400 + 1]) ZYNQMP_ICLK_PHASE;
                oclk_phase = (int [MMC_TIMING_MMC_HS400 + 1]) ZYNQMP_OCLK_PHASE;

                of_property_read_u32(dev->of_node, "xlnx,mio-bank", &mio_bank);
                if (mio_bank == 2) {
                        oclk_phase[MMC_TIMING_UHS_SDR104] = 90;
                        oclk_phase[MMC_TIMING_MMC_HS200] = 90;
                }

                for (i = 0; i <= MMC_TIMING_MMC_HS400; i++) {
                        clk_data->clk_phase_in[i] = iclk_phase[i];
                        clk_data->clk_phase_out[i] = oclk_phase[i];
                }
        }

        if (of_device_is_compatible(dev->of_node, "xlnx,versal-8.9a")) {
                iclk_phase = (int [MMC_TIMING_MMC_HS400 + 1]) VERSAL_ICLK_PHASE;
                oclk_phase = (int [MMC_TIMING_MMC_HS400 + 1]) VERSAL_OCLK_PHASE;

                for (i = 0; i <= MMC_TIMING_MMC_HS400; i++) {
                        clk_data->clk_phase_in[i] = iclk_phase[i];
                        clk_data->clk_phase_out[i] = oclk_phase[i];
                }
        }

        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_LEGACY,
                                 "clk-phase-legacy");
        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS,
                                 "clk-phase-mmc-hs");
        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_SD_HS,
                                 "clk-phase-sd-hs");
        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR12,
                                 "clk-phase-uhs-sdr12");
        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR25,
                                 "clk-phase-uhs-sdr25");
        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR50,
                                 "clk-phase-uhs-sdr50");
        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_SDR104,
                                 "clk-phase-uhs-sdr104");
        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_UHS_DDR50,
                                 "clk-phase-uhs-ddr50");
        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_DDR52,
                                 "clk-phase-mmc-ddr52");
        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS200,
                                 "clk-phase-mmc-hs200");
        arasan_dt_read_clk_phase(dev, clk_data, MMC_TIMING_MMC_HS400,
                                 "clk-phase-mmc-hs400");
}

/**
 * sdhci_arasan_register_sdcardclk - Register the sdcardclk for a PHY to use
 *
 * Some PHY devices need to know what the actual card clock is.  In order for
 * them to find out, we'll provide a clock through the common clock framework
 * for them to query.
 *
 * @sdhci_arasan:       Our private data structure.
 * @clk_xin:            Pointer to the functional clock
 * @dev:                Pointer to our struct device.
 * Returns 0 on success and error value on error
 */
static int
sdhci_arasan_register_sdcardclk(struct sdhci_arasan_data *sdhci_arasan,
                                struct clk *clk_xin,
                                struct device *dev)
{
        struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
        struct device_node *np = dev->of_node;
        struct clk_init_data sdcardclk_init;
        const char *parent_clk_name;
        int ret;

        ret = of_property_read_string_index(np, "clock-output-names", 0,
                                            &sdcardclk_init.name);
        if (ret) {
                dev_err(dev, "DT has #clock-cells but no clock-output-names\n");
                return ret;
        }

        parent_clk_name = __clk_get_name(clk_xin);
        sdcardclk_init.parent_names = &parent_clk_name;
        sdcardclk_init.num_parents = 1;
        sdcardclk_init.flags = CLK_GET_RATE_NOCACHE;
        if (of_device_is_compatible(np, "xlnx,zynqmp-8.9a"))
                sdcardclk_init.ops = &zynqmp_sdcardclk_ops;
        else if (of_device_is_compatible(np, "xlnx,versal-8.9a"))
                sdcardclk_init.ops = &versal_sdcardclk_ops;
        else
                sdcardclk_init.ops = &arasan_sdcardclk_ops;

        clk_data->sdcardclk_hw.init = &sdcardclk_init;
        clk_data->sdcardclk =
                devm_clk_register(dev, &clk_data->sdcardclk_hw);
        clk_data->sdcardclk_hw.init = NULL;

        ret = of_clk_add_provider(np, of_clk_src_simple_get,
                                  clk_data->sdcardclk);
        if (ret)
                dev_err(dev, "Failed to add sdcard clock provider\n");

        return ret;
}

/**
 * sdhci_arasan_register_sampleclk - Register the sampleclk for a PHY to use
 *
 * Some PHY devices need to know what the actual card clock is.  In order for
 * them to find out, we'll provide a clock through the common clock framework
 * for them to query.
 *
 * @sdhci_arasan:       Our private data structure.
 * @clk_xin:            Pointer to the functional clock
 * @dev:                Pointer to our struct device.
 * Returns 0 on success and error value on error
 */
static int
sdhci_arasan_register_sampleclk(struct sdhci_arasan_data *sdhci_arasan,
                                struct clk *clk_xin,
                                struct device *dev)
{
        struct sdhci_arasan_clk_data *clk_data = &sdhci_arasan->clk_data;
        struct device_node *np = dev->of_node;
        struct clk_init_data sampleclk_init;
        const char *parent_clk_name;
        int ret;

        ret = of_property_read_string_index(np, "clock-output-names", 1,
                                            &sampleclk_init.name);
        if (ret) {
                dev_err(dev, "DT has #clock-cells but no clock-output-names\n");
                return ret;
        }

        parent_clk_name = __clk_get_name(clk_xin);
        sampleclk_init.parent_names = &parent_clk_name;
        sampleclk_init.num_parents = 1;
        sampleclk_init.flags = CLK_GET_RATE_NOCACHE;
        if (of_device_is_compatible(np, "xlnx,zynqmp-8.9a"))
                sampleclk_init.ops = &zynqmp_sampleclk_ops;
        else if (of_device_is_compatible(np, "xlnx,versal-8.9a"))
                sampleclk_init.ops = &versal_sampleclk_ops;
        else
                sampleclk_init.ops = &arasan_sampleclk_ops;

        clk_data->sampleclk_hw.init = &sampleclk_init;
        clk_data->sampleclk =
                devm_clk_register(dev, &clk_data->sampleclk_hw);
        clk_data->sampleclk_hw.init = NULL;

        ret = of_clk_add_provider(np, of_clk_src_simple_get,
                                  clk_data->sampleclk);
        if (ret)
                dev_err(dev, "Failed to add sample clock provider\n");

        return ret;
}

/**
 * sdhci_arasan_unregister_sdclk - Undoes sdhci_arasan_register_sdclk()
 *
 * Should be called any time we're exiting and sdhci_arasan_register_sdclk()
 * returned success.
 *
 * @dev:                Pointer to our struct device.
 */
static void sdhci_arasan_unregister_sdclk(struct device *dev)
{
        struct device_node *np = dev->of_node;

        if (!of_find_property(np, "#clock-cells", NULL))
                return;

        of_clk_del_provider(dev->of_node);
}

/**
 * sdhci_arasan_register_sdclk - Register the sdcardclk for a PHY to use
 *
 * Some PHY devices need to know what the actual card clock is.  In order for
 * them to find out, we'll provide a clock through the common clock framework
 * for them to query.
 *
 * Note: without seriously re-architecting SDHCI's clock code and testing on
 * all platforms, there's no way to create a totally beautiful clock here
 * with all clock ops implemented.  Instead, we'll just create a clock that can
 * be queried and set the CLK_GET_RATE_NOCACHE attribute to tell common clock
 * framework that we're doing things behind its back.  This should be sufficient
 * to create nice clean device tree bindings and later (if needed) we can try
 * re-architecting SDHCI if we see some benefit to it.
 *
 * @sdhci_arasan:       Our private data structure.
 * @clk_xin:            Pointer to the functional clock
 * @dev:                Pointer to our struct device.
 * Returns 0 on success and error value on error
 */
static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
                                       struct clk *clk_xin,
                                       struct device *dev)
{
        struct device_node *np = dev->of_node;
        u32 num_clks = 0;
        int ret;

        /* Providing a clock to the PHY is optional; no error if missing */
        if (of_property_read_u32(np, "#clock-cells", &num_clks) < 0)
                return 0;

        ret = sdhci_arasan_register_sdcardclk(sdhci_arasan, clk_xin, dev);
        if (ret)
                return ret;

        if (num_clks) {
                ret = sdhci_arasan_register_sampleclk(sdhci_arasan, clk_xin,
                                                      dev);
                if (ret) {
                        sdhci_arasan_unregister_sdclk(dev);
                        return ret;
                }
        }

        return 0;
}

static int sdhci_arasan_add_host(struct sdhci_arasan_data *sdhci_arasan)
{
        struct sdhci_host *host = sdhci_arasan->host;
        struct cqhci_host *cq_host;
        bool dma64;
        int ret;

        if (!sdhci_arasan->has_cqe)
                return sdhci_add_host(host);

        ret = sdhci_setup_host(host);
        if (ret)
                return ret;

        cq_host = devm_kzalloc(host->mmc->parent,
                               sizeof(*cq_host), GFP_KERNEL);
        if (!cq_host) {
                ret = -ENOMEM;
                goto cleanup;
        }

        cq_host->mmio = host->ioaddr + SDHCI_ARASAN_CQE_BASE_ADDR;
        cq_host->ops = &sdhci_arasan_cqhci_ops;

        dma64 = host->flags & SDHCI_USE_64_BIT_DMA;
        if (dma64)
                cq_host->caps |= CQHCI_TASK_DESC_SZ_128;

        ret = cqhci_init(cq_host, host->mmc, dma64);
        if (ret)
                goto cleanup;

        ret = __sdhci_add_host(host);
        if (ret)
                goto cleanup;

        return 0;

cleanup:
        sdhci_cleanup_host(host);
        return ret;
}

static int sdhci_arasan_probe(struct platform_device *pdev)
{
        int ret;
        const struct of_device_id *match;
        struct device_node *node;
        struct clk *clk_xin;
        struct sdhci_host *host;
        struct sdhci_pltfm_host *pltfm_host;
        struct sdhci_arasan_data *sdhci_arasan;
        struct device_node *np = pdev->dev.of_node;
        const struct sdhci_arasan_of_data *data;

        match = of_match_node(sdhci_arasan_of_match, pdev->dev.of_node);
        data = match->data;
        host = sdhci_pltfm_init(pdev, data->pdata, sizeof(*sdhci_arasan));

        if (IS_ERR(host))
                return PTR_ERR(host);

        pltfm_host = sdhci_priv(host);
        sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        sdhci_arasan->host = host;

        sdhci_arasan->soc_ctl_map = data->soc_ctl_map;

        node = of_parse_phandle(pdev->dev.of_node, "arasan,soc-ctl-syscon", 0);
        if (node) {
                sdhci_arasan->soc_ctl_base = syscon_node_to_regmap(node);
                of_node_put(node);

                if (IS_ERR(sdhci_arasan->soc_ctl_base)) {
                        ret = PTR_ERR(sdhci_arasan->soc_ctl_base);
                        if (ret != -EPROBE_DEFER)
                                dev_err(&pdev->dev, "Can't get syscon: %d\n",
                                        ret);
                        goto err_pltfm_free;
                }
        }

        sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
        if (IS_ERR(sdhci_arasan->clk_ahb)) {
                dev_err(&pdev->dev, "clk_ahb clock not found.\n");
                ret = PTR_ERR(sdhci_arasan->clk_ahb);
                goto err_pltfm_free;
        }

        clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
        if (IS_ERR(clk_xin)) {
                dev_err(&pdev->dev, "clk_xin clock not found.\n");
                ret = PTR_ERR(clk_xin);
                goto err_pltfm_free;
        }

        ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
        if (ret) {
                dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
                goto err_pltfm_free;
        }

        ret = clk_prepare_enable(clk_xin);
        if (ret) {
                dev_err(&pdev->dev, "Unable to enable SD clock.\n");
                goto clk_dis_ahb;
        }

        sdhci_get_of_property(pdev);

        if (of_property_read_bool(np, "xlnx,fails-without-test-cd"))
                sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_FORCE_CDTEST;

        if (of_property_read_bool(np, "xlnx,int-clock-stable-broken"))
                sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_CLOCK_UNSTABLE;

        pltfm_host->clk = clk_xin;

        if (of_device_is_compatible(pdev->dev.of_node,
                                    "rockchip,rk3399-sdhci-5.1"))
                sdhci_arasan_update_clockmultiplier(host, 0x0);

        sdhci_arasan_update_baseclkfreq(host);

        ret = sdhci_arasan_register_sdclk(sdhci_arasan, clk_xin, &pdev->dev);
        if (ret)
                goto clk_disable_all;

        if (of_device_is_compatible(np, "xlnx,zynqmp-8.9a")) {
                struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data;
                const struct zynqmp_eemi_ops *eemi_ops;

                zynqmp_clk_data = devm_kzalloc(&pdev->dev,
                                               sizeof(*zynqmp_clk_data),
                                               GFP_KERNEL);
                eemi_ops = zynqmp_pm_get_eemi_ops();
                if (IS_ERR(eemi_ops)) {
                        ret = PTR_ERR(eemi_ops);
                        goto unreg_clk;
                }

                zynqmp_clk_data->eemi_ops = eemi_ops;
                sdhci_arasan->clk_data.clk_of_data = zynqmp_clk_data;
                host->mmc_host_ops.execute_tuning =
                        arasan_zynqmp_execute_tuning;

                sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_CLOCK_25_BROKEN;
                host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
        }

        arasan_dt_parse_clk_phases(&pdev->dev, &sdhci_arasan->clk_data);

        ret = mmc_of_parse(host->mmc);
        if (ret) {
                if (ret != -EPROBE_DEFER)
                        dev_err(&pdev->dev, "parsing dt failed (%d)\n", ret);
                goto unreg_clk;
        }

        sdhci_arasan->pinctrl = devm_pinctrl_get(&pdev->dev);
        if (!IS_ERR(sdhci_arasan->pinctrl)) {
                sdhci_arasan->pins_default =
                        pinctrl_lookup_state(sdhci_arasan->pinctrl,
                                             PINCTRL_STATE_DEFAULT);
                if (IS_ERR(sdhci_arasan->pins_default)) {
                        dev_err(&pdev->dev, "Missing default pinctrl config\n");
                        return IS_ERR(sdhci_arasan->pins_default);
                }

                pinctrl_select_state(sdhci_arasan->pinctrl,
                                     sdhci_arasan->pins_default);
        }

        sdhci_arasan->phy = ERR_PTR(-ENODEV);
        if (of_device_is_compatible(pdev->dev.of_node,
                                    "arasan,sdhci-5.1")) {
                sdhci_arasan->phy = devm_phy_get(&pdev->dev,
                                                 "phy_arasan");
                if (IS_ERR(sdhci_arasan->phy)) {
                        ret = PTR_ERR(sdhci_arasan->phy);
                        dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
                        goto unreg_clk;
                }

                ret = phy_init(sdhci_arasan->phy);
                if (ret < 0) {
                        dev_err(&pdev->dev, "phy_init err.\n");
                        goto unreg_clk;
                }

                host->mmc_host_ops.hs400_enhanced_strobe =
                                        sdhci_arasan_hs400_enhanced_strobe;
                host->mmc_host_ops.start_signal_voltage_switch =
                                        sdhci_arasan_voltage_switch;
                sdhci_arasan->has_cqe = true;
                host->mmc->caps2 |= MMC_CAP2_CQE;

                if (!of_property_read_bool(np, "disable-cqe-dcmd"))
                        host->mmc->caps2 |= MMC_CAP2_CQE_DCMD;
        }

        ret = sdhci_arasan_add_host(sdhci_arasan);
        if (ret)
                goto err_add_host;

        return 0;

err_add_host:
        if (!IS_ERR(sdhci_arasan->phy))
                phy_exit(sdhci_arasan->phy);
unreg_clk:
        sdhci_arasan_unregister_sdclk(&pdev->dev);
clk_disable_all:
        clk_disable_unprepare(clk_xin);
clk_dis_ahb:
        clk_disable_unprepare(sdhci_arasan->clk_ahb);
err_pltfm_free:
        sdhci_pltfm_free(pdev);
        return ret;
}

static int sdhci_arasan_remove(struct platform_device *pdev)
{
        int ret;
        struct sdhci_host *host = platform_get_drvdata(pdev);
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
        struct clk *clk_ahb = sdhci_arasan->clk_ahb;

        if (!IS_ERR(sdhci_arasan->phy)) {
                if (sdhci_arasan->is_phy_on)
                        phy_power_off(sdhci_arasan->phy);
                phy_exit(sdhci_arasan->phy);
        }

        sdhci_arasan_unregister_sdclk(&pdev->dev);

        ret = sdhci_pltfm_unregister(pdev);

        clk_disable_unprepare(clk_ahb);

        return ret;
}

static struct platform_driver sdhci_arasan_driver = {
        .driver = {
                .name = "sdhci-arasan",
                .of_match_table = sdhci_arasan_of_match,
                .pm = &sdhci_arasan_dev_pm_ops,
        },
        .probe = sdhci_arasan_probe,
        .remove = sdhci_arasan_remove,
};

module_platform_driver(sdhci_arasan_driver);

MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
MODULE_LICENSE("GPL");