UBUNTU: Ubuntu-4.15.0-96.97

[mirror_ubuntu-bionic-kernel.git] / drivers / mmc / host / sdhci-msm.c

/*
 * drivers/mmc/host/sdhci-msm.c - Qualcomm SDHCI Platform driver
 *
 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/delay.h>
#include <linux/mmc/mmc.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/iopoll.h>

#include "sdhci-pltfm.h"

#define CORE_MCI_VERSION                0x50
#define CORE_VERSION_MAJOR_SHIFT        28
#define CORE_VERSION_MAJOR_MASK         (0xf << CORE_VERSION_MAJOR_SHIFT)
#define CORE_VERSION_MINOR_MASK         0xff

#define CORE_MCI_GENERICS               0x70
#define SWITCHABLE_SIGNALING_VOLTAGE    BIT(29)

#define CORE_HC_MODE            0x78
#define HC_MODE_EN              0x1
#define CORE_POWER              0x0
#define CORE_SW_RST             BIT(7)
#define FF_CLK_SW_RST_DIS       BIT(13)

#define CORE_PWRCTL_STATUS      0xdc
#define CORE_PWRCTL_MASK        0xe0
#define CORE_PWRCTL_CLEAR       0xe4
#define CORE_PWRCTL_CTL         0xe8
#define CORE_PWRCTL_BUS_OFF     BIT(0)
#define CORE_PWRCTL_BUS_ON      BIT(1)
#define CORE_PWRCTL_IO_LOW      BIT(2)
#define CORE_PWRCTL_IO_HIGH     BIT(3)
#define CORE_PWRCTL_BUS_SUCCESS BIT(0)
#define CORE_PWRCTL_IO_SUCCESS  BIT(2)
#define REQ_BUS_OFF             BIT(0)
#define REQ_BUS_ON              BIT(1)
#define REQ_IO_LOW              BIT(2)
#define REQ_IO_HIGH             BIT(3)
#define INT_MASK                0xf
#define MAX_PHASES              16
#define CORE_DLL_LOCK           BIT(7)
#define CORE_DDR_DLL_LOCK       BIT(11)
#define CORE_DLL_EN             BIT(16)
#define CORE_CDR_EN             BIT(17)
#define CORE_CK_OUT_EN          BIT(18)
#define CORE_CDR_EXT_EN         BIT(19)
#define CORE_DLL_PDN            BIT(29)
#define CORE_DLL_RST            BIT(30)
#define CORE_DLL_CONFIG         0x100
#define CORE_CMD_DAT_TRACK_SEL  BIT(0)
#define CORE_DLL_STATUS         0x108

#define CORE_DLL_CONFIG_2       0x1b4
#define CORE_DDR_CAL_EN         BIT(0)
#define CORE_FLL_CYCLE_CNT      BIT(18)
#define CORE_DLL_CLOCK_DISABLE  BIT(21)

#define CORE_VENDOR_SPEC        0x10c
#define CORE_VENDOR_SPEC_POR_VAL        0xa1c
#define CORE_CLK_PWRSAVE        BIT(1)
#define CORE_HC_MCLK_SEL_DFLT   (2 << 8)
#define CORE_HC_MCLK_SEL_HS400  (3 << 8)
#define CORE_HC_MCLK_SEL_MASK   (3 << 8)
#define CORE_HC_SELECT_IN_EN    BIT(18)
#define CORE_HC_SELECT_IN_HS400 (6 << 19)
#define CORE_HC_SELECT_IN_MASK  (7 << 19)

#define CORE_CSR_CDC_CTLR_CFG0          0x130
#define CORE_SW_TRIG_FULL_CALIB         BIT(16)
#define CORE_HW_AUTOCAL_ENA             BIT(17)

#define CORE_CSR_CDC_CTLR_CFG1          0x134
#define CORE_CSR_CDC_CAL_TIMER_CFG0     0x138
#define CORE_TIMER_ENA                  BIT(16)

#define CORE_CSR_CDC_CAL_TIMER_CFG1     0x13C
#define CORE_CSR_CDC_REFCOUNT_CFG       0x140
#define CORE_CSR_CDC_COARSE_CAL_CFG     0x144
#define CORE_CDC_OFFSET_CFG             0x14C
#define CORE_CSR_CDC_DELAY_CFG          0x150
#define CORE_CDC_SLAVE_DDA_CFG          0x160
#define CORE_CSR_CDC_STATUS0            0x164
#define CORE_CALIBRATION_DONE           BIT(0)

#define CORE_CDC_ERROR_CODE_MASK        0x7000000

#define CORE_CSR_CDC_GEN_CFG            0x178
#define CORE_CDC_SWITCH_BYPASS_OFF      BIT(0)
#define CORE_CDC_SWITCH_RC_EN           BIT(1)

#define CORE_DDR_200_CFG                0x184
#define CORE_CDC_T4_DLY_SEL             BIT(0)
#define CORE_CMDIN_RCLK_EN              BIT(1)
#define CORE_START_CDC_TRAFFIC          BIT(6)
#define CORE_VENDOR_SPEC3       0x1b0
#define CORE_PWRSAVE_DLL        BIT(3)

#define CORE_DDR_CONFIG         0x1b8
#define DDR_CONFIG_POR_VAL      0x80040853

#define CORE_VENDOR_SPEC_CAPABILITIES0  0x11c

#define INVALID_TUNING_PHASE    -1
#define SDHCI_MSM_MIN_CLOCK     400000
#define CORE_FREQ_100MHZ        (100 * 1000 * 1000)

#define CDR_SELEXT_SHIFT        20
#define CDR_SELEXT_MASK         (0xf << CDR_SELEXT_SHIFT)
#define CMUX_SHIFT_PHASE_SHIFT  24
#define CMUX_SHIFT_PHASE_MASK   (7 << CMUX_SHIFT_PHASE_SHIFT)

#define MSM_MMC_AUTOSUSPEND_DELAY_MS    50

/* Timeout value to avoid infinite waiting for pwr_irq */
#define MSM_PWR_IRQ_TIMEOUT_MS 5000

struct sdhci_msm_host {
        struct platform_device *pdev;
        void __iomem *core_mem; /* MSM SDCC mapped address */
        int pwr_irq;            /* power irq */
        struct clk *bus_clk;    /* SDHC bus voter clock */
        struct clk *xo_clk;     /* TCXO clk needed for FLL feature of cm_dll*/
        struct clk_bulk_data bulk_clks[4]; /* core, iface, cal, sleep clocks */
        unsigned long clk_rate;
        struct mmc_host *mmc;
        bool use_14lpp_dll_reset;
        bool tuning_done;
        bool calibration_done;
        u8 saved_tuning_phase;
        bool use_cdclp533;
        bool use_cdr;
        u32 transfer_mode;
        u32 curr_pwr_state;
        u32 curr_io_level;
        wait_queue_head_t pwr_irq_wait;
        bool pwr_irq_flag;
};

static unsigned int msm_get_clock_rate_for_bus_mode(struct sdhci_host *host,
                                                    unsigned int clock)
{
        struct mmc_ios ios = host->mmc->ios;
        /*
         * The SDHC requires internal clock frequency to be double the
         * actual clock that will be set for DDR mode. The controller
         * uses the faster clock(100/400MHz) for some of its parts and
         * send the actual required clock (50/200MHz) to the card.
         */
        if (ios.timing == MMC_TIMING_UHS_DDR50 ||
            ios.timing == MMC_TIMING_MMC_DDR52 ||
            ios.timing == MMC_TIMING_MMC_HS400 ||
            host->flags & SDHCI_HS400_TUNING)
                clock *= 2;
        return clock;
}

static void msm_set_clock_rate_for_bus_mode(struct sdhci_host *host,
                                            unsigned int clock)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        struct mmc_ios curr_ios = host->mmc->ios;
        struct clk *core_clk = msm_host->bulk_clks[0].clk;
        int rc;

        clock = msm_get_clock_rate_for_bus_mode(host, clock);
        rc = clk_set_rate(core_clk, clock);
        if (rc) {
                pr_err("%s: Failed to set clock at rate %u at timing %d\n",
                       mmc_hostname(host->mmc), clock,
                       curr_ios.timing);
                return;
        }
        msm_host->clk_rate = clock;
        pr_debug("%s: Setting clock at rate %lu at timing %d\n",
                 mmc_hostname(host->mmc), clk_get_rate(core_clk),
                 curr_ios.timing);
}

/* Platform specific tuning */
static inline int msm_dll_poll_ck_out_en(struct sdhci_host *host, u8 poll)
{
        u32 wait_cnt = 50;
        u8 ck_out_en;
        struct mmc_host *mmc = host->mmc;

        /* Poll for CK_OUT_EN bit.  max. poll time = 50us */
        ck_out_en = !!(readl_relaxed(host->ioaddr + CORE_DLL_CONFIG) &
                        CORE_CK_OUT_EN);

        while (ck_out_en != poll) {
                if (--wait_cnt == 0) {
                        dev_err(mmc_dev(mmc), "%s: CK_OUT_EN bit is not %d\n",
                               mmc_hostname(mmc), poll);
                        return -ETIMEDOUT;
                }
                udelay(1);

                ck_out_en = !!(readl_relaxed(host->ioaddr + CORE_DLL_CONFIG) &
                                CORE_CK_OUT_EN);
        }

        return 0;
}

static int msm_config_cm_dll_phase(struct sdhci_host *host, u8 phase)
{
        int rc;
        static const u8 grey_coded_phase_table[] = {
                0x0, 0x1, 0x3, 0x2, 0x6, 0x7, 0x5, 0x4,
                0xc, 0xd, 0xf, 0xe, 0xa, 0xb, 0x9, 0x8
        };
        unsigned long flags;
        u32 config;
        struct mmc_host *mmc = host->mmc;

        if (phase > 0xf)
                return -EINVAL;

        spin_lock_irqsave(&host->lock, flags);

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config &= ~(CORE_CDR_EN | CORE_CK_OUT_EN);
        config |= (CORE_CDR_EXT_EN | CORE_DLL_EN);
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

        /* Wait until CK_OUT_EN bit of DLL_CONFIG register becomes '0' */
        rc = msm_dll_poll_ck_out_en(host, 0);
        if (rc)
                goto err_out;

        /*
         * Write the selected DLL clock output phase (0 ... 15)
         * to CDR_SELEXT bit field of DLL_CONFIG register.
         */
        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config &= ~CDR_SELEXT_MASK;
        config |= grey_coded_phase_table[phase] << CDR_SELEXT_SHIFT;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config |= CORE_CK_OUT_EN;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

        /* Wait until CK_OUT_EN bit of DLL_CONFIG register becomes '1' */
        rc = msm_dll_poll_ck_out_en(host, 1);
        if (rc)
                goto err_out;

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config |= CORE_CDR_EN;
        config &= ~CORE_CDR_EXT_EN;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
        goto out;

err_out:
        dev_err(mmc_dev(mmc), "%s: Failed to set DLL phase: %d\n",
               mmc_hostname(mmc), phase);
out:
        spin_unlock_irqrestore(&host->lock, flags);
        return rc;
}

/*
 * Find out the greatest range of consecuitive selected
 * DLL clock output phases that can be used as sampling
 * setting for SD3.0 UHS-I card read operation (in SDR104
 * timing mode) or for eMMC4.5 card read operation (in
 * HS400/HS200 timing mode).
 * Select the 3/4 of the range and configure the DLL with the
 * selected DLL clock output phase.
 */

static int msm_find_most_appropriate_phase(struct sdhci_host *host,
                                           u8 *phase_table, u8 total_phases)
{
        int ret;
        u8 ranges[MAX_PHASES][MAX_PHASES] = { {0}, {0} };
        u8 phases_per_row[MAX_PHASES] = { 0 };
        int row_index = 0, col_index = 0, selected_row_index = 0, curr_max = 0;
        int i, cnt, phase_0_raw_index = 0, phase_15_raw_index = 0;
        bool phase_0_found = false, phase_15_found = false;
        struct mmc_host *mmc = host->mmc;

        if (!total_phases || (total_phases > MAX_PHASES)) {
                dev_err(mmc_dev(mmc), "%s: Invalid argument: total_phases=%d\n",
                       mmc_hostname(mmc), total_phases);
                return -EINVAL;
        }

        for (cnt = 0; cnt < total_phases; cnt++) {
                ranges[row_index][col_index] = phase_table[cnt];
                phases_per_row[row_index] += 1;
                col_index++;

                if ((cnt + 1) == total_phases) {
                        continue;
                /* check if next phase in phase_table is consecutive or not */
                } else if ((phase_table[cnt] + 1) != phase_table[cnt + 1]) {
                        row_index++;
                        col_index = 0;
                }
        }

        if (row_index >= MAX_PHASES)
                return -EINVAL;

        /* Check if phase-0 is present in first valid window? */
        if (!ranges[0][0]) {
                phase_0_found = true;
                phase_0_raw_index = 0;
                /* Check if cycle exist between 2 valid windows */
                for (cnt = 1; cnt <= row_index; cnt++) {
                        if (phases_per_row[cnt]) {
                                for (i = 0; i < phases_per_row[cnt]; i++) {
                                        if (ranges[cnt][i] == 15) {
                                                phase_15_found = true;
                                                phase_15_raw_index = cnt;
                                                break;
                                        }
                                }
                        }
                }
        }

        /* If 2 valid windows form cycle then merge them as single window */
        if (phase_0_found && phase_15_found) {
                /* number of phases in raw where phase 0 is present */
                u8 phases_0 = phases_per_row[phase_0_raw_index];
                /* number of phases in raw where phase 15 is present */
                u8 phases_15 = phases_per_row[phase_15_raw_index];

                if (phases_0 + phases_15 >= MAX_PHASES)
                        /*
                         * If there are more than 1 phase windows then total
                         * number of phases in both the windows should not be
                         * more than or equal to MAX_PHASES.
                         */
                        return -EINVAL;

                /* Merge 2 cyclic windows */
                i = phases_15;
                for (cnt = 0; cnt < phases_0; cnt++) {
                        ranges[phase_15_raw_index][i] =
                            ranges[phase_0_raw_index][cnt];
                        if (++i >= MAX_PHASES)
                                break;
                }

                phases_per_row[phase_0_raw_index] = 0;
                phases_per_row[phase_15_raw_index] = phases_15 + phases_0;
        }

        for (cnt = 0; cnt <= row_index; cnt++) {
                if (phases_per_row[cnt] > curr_max) {
                        curr_max = phases_per_row[cnt];
                        selected_row_index = cnt;
                }
        }

        i = (curr_max * 3) / 4;
        if (i)
                i--;

        ret = ranges[selected_row_index][i];

        if (ret >= MAX_PHASES) {
                ret = -EINVAL;
                dev_err(mmc_dev(mmc), "%s: Invalid phase selected=%d\n",
                       mmc_hostname(mmc), ret);
        }

        return ret;
}

static inline void msm_cm_dll_set_freq(struct sdhci_host *host)
{
        u32 mclk_freq = 0, config;

        /* Program the MCLK value to MCLK_FREQ bit field */
        if (host->clock <= 112000000)
                mclk_freq = 0;
        else if (host->clock <= 125000000)
                mclk_freq = 1;
        else if (host->clock <= 137000000)
                mclk_freq = 2;
        else if (host->clock <= 150000000)
                mclk_freq = 3;
        else if (host->clock <= 162000000)
                mclk_freq = 4;
        else if (host->clock <= 175000000)
                mclk_freq = 5;
        else if (host->clock <= 187000000)
                mclk_freq = 6;
        else if (host->clock <= 200000000)
                mclk_freq = 7;

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config &= ~CMUX_SHIFT_PHASE_MASK;
        config |= mclk_freq << CMUX_SHIFT_PHASE_SHIFT;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
}

/* Initialize the DLL (Programmable Delay Line) */
static int msm_init_cm_dll(struct sdhci_host *host)
{
        struct mmc_host *mmc = host->mmc;
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        int wait_cnt = 50;
        unsigned long flags, xo_clk = 0;
        u32 config;

        if (msm_host->use_14lpp_dll_reset && !IS_ERR_OR_NULL(msm_host->xo_clk))
                xo_clk = clk_get_rate(msm_host->xo_clk);

        spin_lock_irqsave(&host->lock, flags);

        /*
         * Make sure that clock is always enabled when DLL
         * tuning is in progress. Keeping PWRSAVE ON may
         * turn off the clock.
         */
        config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
        config &= ~CORE_CLK_PWRSAVE;
        writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);

        if (msm_host->use_14lpp_dll_reset) {
                config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
                config &= ~CORE_CK_OUT_EN;
                writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

                config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
                config |= CORE_DLL_CLOCK_DISABLE;
                writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2);
        }

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config |= CORE_DLL_RST;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config |= CORE_DLL_PDN;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
        msm_cm_dll_set_freq(host);

        if (msm_host->use_14lpp_dll_reset &&
            !IS_ERR_OR_NULL(msm_host->xo_clk)) {
                u32 mclk_freq = 0;

                config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
                config &= CORE_FLL_CYCLE_CNT;
                if (config)
                        mclk_freq = DIV_ROUND_CLOSEST_ULL((host->clock * 8),
                                        xo_clk);
                else
                        mclk_freq = DIV_ROUND_CLOSEST_ULL((host->clock * 4),
                                        xo_clk);

                config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
                config &= ~(0xFF << 10);
                config |= mclk_freq << 10;

                writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2);
                /* wait for 5us before enabling DLL clock */
                udelay(5);
        }

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config &= ~CORE_DLL_RST;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config &= ~CORE_DLL_PDN;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

        if (msm_host->use_14lpp_dll_reset) {
                msm_cm_dll_set_freq(host);
                config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
                config &= ~CORE_DLL_CLOCK_DISABLE;
                writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2);
        }

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config |= CORE_DLL_EN;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config |= CORE_CK_OUT_EN;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

        /* Wait until DLL_LOCK bit of DLL_STATUS register becomes '1' */
        while (!(readl_relaxed(host->ioaddr + CORE_DLL_STATUS) &
                 CORE_DLL_LOCK)) {
                /* max. wait for 50us sec for LOCK bit to be set */
                if (--wait_cnt == 0) {
                        dev_err(mmc_dev(mmc), "%s: DLL failed to LOCK\n",
                               mmc_hostname(mmc));
                        spin_unlock_irqrestore(&host->lock, flags);
                        return -ETIMEDOUT;
                }
                udelay(1);
        }

        spin_unlock_irqrestore(&host->lock, flags);
        return 0;
}

static void msm_hc_select_default(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        u32 config;

        if (!msm_host->use_cdclp533) {
                config = readl_relaxed(host->ioaddr +
                                CORE_VENDOR_SPEC3);
                config &= ~CORE_PWRSAVE_DLL;
                writel_relaxed(config, host->ioaddr +
                                CORE_VENDOR_SPEC3);
        }

        config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
        config &= ~CORE_HC_MCLK_SEL_MASK;
        config |= CORE_HC_MCLK_SEL_DFLT;
        writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);

        /*
         * Disable HC_SELECT_IN to be able to use the UHS mode select
         * configuration from Host Control2 register for all other
         * modes.
         * Write 0 to HC_SELECT_IN and HC_SELECT_IN_EN field
         * in VENDOR_SPEC_FUNC
         */
        config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
        config &= ~CORE_HC_SELECT_IN_EN;
        config &= ~CORE_HC_SELECT_IN_MASK;
        writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);

        /*
         * Make sure above writes impacting free running MCLK are completed
         * before changing the clk_rate at GCC.
         */
        wmb();
}

static void msm_hc_select_hs400(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        struct mmc_ios ios = host->mmc->ios;
        u32 config, dll_lock;
        int rc;

        /* Select the divided clock (free running MCLK/2) */
        config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
        config &= ~CORE_HC_MCLK_SEL_MASK;
        config |= CORE_HC_MCLK_SEL_HS400;

        writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
        /*
         * Select HS400 mode using the HC_SELECT_IN from VENDOR SPEC
         * register
         */
        if ((msm_host->tuning_done || ios.enhanced_strobe) &&
            !msm_host->calibration_done) {
                config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
                config |= CORE_HC_SELECT_IN_HS400;
                config |= CORE_HC_SELECT_IN_EN;
                writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
        }
        if (!msm_host->clk_rate && !msm_host->use_cdclp533) {
                /*
                 * Poll on DLL_LOCK or DDR_DLL_LOCK bits in
                 * CORE_DLL_STATUS to be set.  This should get set
                 * within 15 us at 200 MHz.
                 */
                rc = readl_relaxed_poll_timeout(host->ioaddr +
                                                CORE_DLL_STATUS,
                                                dll_lock,
                                                (dll_lock &
                                                (CORE_DLL_LOCK |
                                                CORE_DDR_DLL_LOCK)), 10,
                                                1000);
                if (rc == -ETIMEDOUT)
                        pr_err("%s: Unable to get DLL_LOCK/DDR_DLL_LOCK, dll_status: 0x%08x\n",
                               mmc_hostname(host->mmc), dll_lock);
        }
        /*
         * Make sure above writes impacting free running MCLK are completed
         * before changing the clk_rate at GCC.
         */
        wmb();
}

/*
 * sdhci_msm_hc_select_mode :- In general all timing modes are
 * controlled via UHS mode select in Host Control2 register.
 * eMMC specific HS200/HS400 doesn't have their respective modes
 * defined here, hence we use these values.
 *
 * HS200 - SDR104 (Since they both are equivalent in functionality)
 * HS400 - This involves multiple configurations
 *              Initially SDR104 - when tuning is required as HS200
 *              Then when switching to DDR @ 400MHz (HS400) we use
 *              the vendor specific HC_SELECT_IN to control the mode.
 *
 * In addition to controlling the modes we also need to select the
 * correct input clock for DLL depending on the mode.
 *
 * HS400 - divided clock (free running MCLK/2)
 * All other modes - default (free running MCLK)
 */
static void sdhci_msm_hc_select_mode(struct sdhci_host *host)
{
        struct mmc_ios ios = host->mmc->ios;

        if (ios.timing == MMC_TIMING_MMC_HS400 ||
            host->flags & SDHCI_HS400_TUNING)
                msm_hc_select_hs400(host);
        else
                msm_hc_select_default(host);
}

static int sdhci_msm_cdclp533_calibration(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        u32 config, calib_done;
        int ret;

        pr_debug("%s: %s: Enter\n", mmc_hostname(host->mmc), __func__);

        /*
         * Retuning in HS400 (DDR mode) will fail, just reset the
         * tuning block and restore the saved tuning phase.
         */
        ret = msm_init_cm_dll(host);
        if (ret)
                goto out;

        /* Set the selected phase in delay line hw block */
        ret = msm_config_cm_dll_phase(host, msm_host->saved_tuning_phase);
        if (ret)
                goto out;

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
        config |= CORE_CMD_DAT_TRACK_SEL;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

        config = readl_relaxed(host->ioaddr + CORE_DDR_200_CFG);
        config &= ~CORE_CDC_T4_DLY_SEL;
        writel_relaxed(config, host->ioaddr + CORE_DDR_200_CFG);

        config = readl_relaxed(host->ioaddr + CORE_CSR_CDC_GEN_CFG);
        config &= ~CORE_CDC_SWITCH_BYPASS_OFF;
        writel_relaxed(config, host->ioaddr + CORE_CSR_CDC_GEN_CFG);

        config = readl_relaxed(host->ioaddr + CORE_CSR_CDC_GEN_CFG);
        config |= CORE_CDC_SWITCH_RC_EN;
        writel_relaxed(config, host->ioaddr + CORE_CSR_CDC_GEN_CFG);

        config = readl_relaxed(host->ioaddr + CORE_DDR_200_CFG);
        config &= ~CORE_START_CDC_TRAFFIC;
        writel_relaxed(config, host->ioaddr + CORE_DDR_200_CFG);

        /* Perform CDC Register Initialization Sequence */

        writel_relaxed(0x11800EC, host->ioaddr + CORE_CSR_CDC_CTLR_CFG0);
        writel_relaxed(0x3011111, host->ioaddr + CORE_CSR_CDC_CTLR_CFG1);
        writel_relaxed(0x1201000, host->ioaddr + CORE_CSR_CDC_CAL_TIMER_CFG0);
        writel_relaxed(0x4, host->ioaddr + CORE_CSR_CDC_CAL_TIMER_CFG1);
        writel_relaxed(0xCB732020, host->ioaddr + CORE_CSR_CDC_REFCOUNT_CFG);
        writel_relaxed(0xB19, host->ioaddr + CORE_CSR_CDC_COARSE_CAL_CFG);
        writel_relaxed(0x4E2, host->ioaddr + CORE_CSR_CDC_DELAY_CFG);
        writel_relaxed(0x0, host->ioaddr + CORE_CDC_OFFSET_CFG);
        writel_relaxed(0x16334, host->ioaddr + CORE_CDC_SLAVE_DDA_CFG);

        /* CDC HW Calibration */

        config = readl_relaxed(host->ioaddr + CORE_CSR_CDC_CTLR_CFG0);
        config |= CORE_SW_TRIG_FULL_CALIB;
        writel_relaxed(config, host->ioaddr + CORE_CSR_CDC_CTLR_CFG0);

        config = readl_relaxed(host->ioaddr + CORE_CSR_CDC_CTLR_CFG0);
        config &= ~CORE_SW_TRIG_FULL_CALIB;
        writel_relaxed(config, host->ioaddr + CORE_CSR_CDC_CTLR_CFG0);

        config = readl_relaxed(host->ioaddr + CORE_CSR_CDC_CTLR_CFG0);
        config |= CORE_HW_AUTOCAL_ENA;
        writel_relaxed(config, host->ioaddr + CORE_CSR_CDC_CTLR_CFG0);

        config = readl_relaxed(host->ioaddr + CORE_CSR_CDC_CAL_TIMER_CFG0);
        config |= CORE_TIMER_ENA;
        writel_relaxed(config, host->ioaddr + CORE_CSR_CDC_CAL_TIMER_CFG0);

        ret = readl_relaxed_poll_timeout(host->ioaddr + CORE_CSR_CDC_STATUS0,
                                         calib_done,
                                         (calib_done & CORE_CALIBRATION_DONE),
                                         1, 50);

        if (ret == -ETIMEDOUT) {
                pr_err("%s: %s: CDC calibration was not completed\n",
                       mmc_hostname(host->mmc), __func__);
                goto out;
        }

        ret = readl_relaxed(host->ioaddr + CORE_CSR_CDC_STATUS0)
                        & CORE_CDC_ERROR_CODE_MASK;
        if (ret) {
                pr_err("%s: %s: CDC error code %d\n",
                       mmc_hostname(host->mmc), __func__, ret);
                ret = -EINVAL;
                goto out;
        }

        config = readl_relaxed(host->ioaddr + CORE_DDR_200_CFG);
        config |= CORE_START_CDC_TRAFFIC;
        writel_relaxed(config, host->ioaddr + CORE_DDR_200_CFG);
out:
        pr_debug("%s: %s: Exit, ret %d\n", mmc_hostname(host->mmc),
                 __func__, ret);
        return ret;
}

static int sdhci_msm_cm_dll_sdc4_calibration(struct sdhci_host *host)
{
        struct mmc_host *mmc = host->mmc;
        u32 dll_status, config;
        int ret;

        pr_debug("%s: %s: Enter\n", mmc_hostname(host->mmc), __func__);

        /*
         * Currently the CORE_DDR_CONFIG register defaults to desired
         * configuration on reset. Currently reprogramming the power on
         * reset (POR) value in case it might have been modified by
         * bootloaders. In the future, if this changes, then the desired
         * values will need to be programmed appropriately.
         */
        writel_relaxed(DDR_CONFIG_POR_VAL, host->ioaddr + CORE_DDR_CONFIG);

        if (mmc->ios.enhanced_strobe) {
                config = readl_relaxed(host->ioaddr + CORE_DDR_200_CFG);
                config |= CORE_CMDIN_RCLK_EN;
                writel_relaxed(config, host->ioaddr + CORE_DDR_200_CFG);
        }

        config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
        config |= CORE_DDR_CAL_EN;
        writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2);

        ret = readl_relaxed_poll_timeout(host->ioaddr + CORE_DLL_STATUS,
                                         dll_status,
                                         (dll_status & CORE_DDR_DLL_LOCK),
                                         10, 1000);

        if (ret == -ETIMEDOUT) {
                pr_err("%s: %s: CM_DLL_SDC4 calibration was not completed\n",
                       mmc_hostname(host->mmc), __func__);
                goto out;
        }

        config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC3);
        config |= CORE_PWRSAVE_DLL;
        writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC3);

        /*
         * Drain writebuffer to ensure above DLL calibration
         * and PWRSAVE DLL is enabled.
         */
        wmb();
out:
        pr_debug("%s: %s: Exit, ret %d\n", mmc_hostname(host->mmc),
                 __func__, ret);
        return ret;
}

static int sdhci_msm_hs400_dll_calibration(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        struct mmc_host *mmc = host->mmc;
        int ret;
        u32 config;

        pr_debug("%s: %s: Enter\n", mmc_hostname(host->mmc), __func__);

        /*
         * Retuning in HS400 (DDR mode) will fail, just reset the
         * tuning block and restore the saved tuning phase.
         */
        ret = msm_init_cm_dll(host);
        if (ret)
                goto out;

        if (!mmc->ios.enhanced_strobe) {
                /* Set the selected phase in delay line hw block */
                ret = msm_config_cm_dll_phase(host,
                                              msm_host->saved_tuning_phase);
                if (ret)
                        goto out;
                config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
                config |= CORE_CMD_DAT_TRACK_SEL;
                writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
        }

        if (msm_host->use_cdclp533)
                ret = sdhci_msm_cdclp533_calibration(host);
        else
                ret = sdhci_msm_cm_dll_sdc4_calibration(host);
out:
        pr_debug("%s: %s: Exit, ret %d\n", mmc_hostname(host->mmc),
                 __func__, ret);
        return ret;
}

static void sdhci_msm_set_cdr(struct sdhci_host *host, bool enable)
{
        u32 config, oldconfig = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);

        config = oldconfig;
        if (enable) {
                config |= CORE_CDR_EN;
                config &= ~CORE_CDR_EXT_EN;
        } else {
                config &= ~CORE_CDR_EN;
                config |= CORE_CDR_EXT_EN;
        }

        if (config != oldconfig)
                writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
}

static int sdhci_msm_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
        struct sdhci_host *host = mmc_priv(mmc);
        int tuning_seq_cnt = 3;
        u8 phase, tuned_phases[16], tuned_phase_cnt = 0;
        int rc;
        struct mmc_ios ios = host->mmc->ios;
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);

        /*
         * Tuning is required for SDR104, HS200 and HS400 cards and
         * if clock frequency is greater than 100MHz in these modes.
         */
        if (host->clock <= CORE_FREQ_100MHZ ||
            !(ios.timing == MMC_TIMING_MMC_HS400 ||
            ios.timing == MMC_TIMING_MMC_HS200 ||
            ios.timing == MMC_TIMING_UHS_SDR104)) {
                msm_host->use_cdr = false;
                sdhci_msm_set_cdr(host, false);
                return 0;
        }

        /* Clock-Data-Recovery used to dynamically adjust RX sampling point */
        msm_host->use_cdr = true;

        /*
         * For HS400 tuning in HS200 timing requires:
         * - select MCLK/2 in VENDOR_SPEC
         * - program MCLK to 400MHz (or nearest supported) in GCC
         */
        if (host->flags & SDHCI_HS400_TUNING) {
                sdhci_msm_hc_select_mode(host);
                msm_set_clock_rate_for_bus_mode(host, ios.clock);
                host->flags &= ~SDHCI_HS400_TUNING;
        }

retry:
        /* First of all reset the tuning block */
        rc = msm_init_cm_dll(host);
        if (rc)
                return rc;

        phase = 0;
        do {
                /* Set the phase in delay line hw block */
                rc = msm_config_cm_dll_phase(host, phase);
                if (rc)
                        return rc;

                msm_host->saved_tuning_phase = phase;
                rc = mmc_send_tuning(mmc, opcode, NULL);
                if (!rc) {
                        /* Tuning is successful at this tuning point */
                        tuned_phases[tuned_phase_cnt++] = phase;
                        dev_dbg(mmc_dev(mmc), "%s: Found good phase = %d\n",
                                 mmc_hostname(mmc), phase);
                }
        } while (++phase < ARRAY_SIZE(tuned_phases));

        if (tuned_phase_cnt) {
                rc = msm_find_most_appropriate_phase(host, tuned_phases,
                                                     tuned_phase_cnt);
                if (rc < 0)
                        return rc;
                else
                        phase = rc;

                /*
                 * Finally set the selected phase in delay
                 * line hw block.
                 */
                rc = msm_config_cm_dll_phase(host, phase);
                if (rc)
                        return rc;
                dev_dbg(mmc_dev(mmc), "%s: Setting the tuning phase to %d\n",
                         mmc_hostname(mmc), phase);
        } else {
                if (--tuning_seq_cnt)
                        goto retry;
                /* Tuning failed */
                dev_dbg(mmc_dev(mmc), "%s: No tuning point found\n",
                       mmc_hostname(mmc));
                rc = -EIO;
        }

        if (!rc)
                msm_host->tuning_done = true;
        return rc;
}

/*
 * sdhci_msm_hs400 - Calibrate the DLL for HS400 bus speed mode operation.
 * This needs to be done for both tuning and enhanced_strobe mode.
 * DLL operation is only needed for clock > 100MHz. For clock <= 100MHz
 * fixed feedback clock is used.
 */
static void sdhci_msm_hs400(struct sdhci_host *host, struct mmc_ios *ios)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        int ret;

        if (host->clock > CORE_FREQ_100MHZ &&
            (msm_host->tuning_done || ios->enhanced_strobe) &&
            !msm_host->calibration_done) {
                ret = sdhci_msm_hs400_dll_calibration(host);
                if (!ret)
                        msm_host->calibration_done = true;
                else
                        pr_err("%s: Failed to calibrate DLL for hs400 mode (%d)\n",
                               mmc_hostname(host->mmc), ret);
        }
}

static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
                                        unsigned int uhs)
{
        struct mmc_host *mmc = host->mmc;
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        u16 ctrl_2;
        u32 config;

        ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
        /* Select Bus Speed Mode for host */
        ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
        switch (uhs) {
        case MMC_TIMING_UHS_SDR12:
                ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
                break;
        case MMC_TIMING_UHS_SDR25:
                ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
                break;
        case MMC_TIMING_UHS_SDR50:
                ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
                break;
        case MMC_TIMING_MMC_HS400:
        case MMC_TIMING_MMC_HS200:
        case MMC_TIMING_UHS_SDR104:
                ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
                break;
        case MMC_TIMING_UHS_DDR50:
        case MMC_TIMING_MMC_DDR52:
                ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
                break;
        }

        /*
         * When clock frequency is less than 100MHz, the feedback clock must be
         * provided and DLL must not be used so that tuning can be skipped. To
         * provide feedback clock, the mode selection can be any value less
         * than 3'b011 in bits [2:0] of HOST CONTROL2 register.
         */
        if (host->clock <= CORE_FREQ_100MHZ) {
                if (uhs == MMC_TIMING_MMC_HS400 ||
                    uhs == MMC_TIMING_MMC_HS200 ||
                    uhs == MMC_TIMING_UHS_SDR104)
                        ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
                /*
                 * DLL is not required for clock <= 100MHz
                 * Thus, make sure DLL it is disabled when not required
                 */
                config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
                config |= CORE_DLL_RST;
                writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

                config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
                config |= CORE_DLL_PDN;
                writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);

                /*
                 * The DLL needs to be restored and CDCLP533 recalibrated
                 * when the clock frequency is set back to 400MHz.
                 */
                msm_host->calibration_done = false;
        }

        dev_dbg(mmc_dev(mmc), "%s: clock=%u uhs=%u ctrl_2=0x%x\n",
                mmc_hostname(host->mmc), host->clock, uhs, ctrl_2);
        sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);

        if (mmc->ios.timing == MMC_TIMING_MMC_HS400)
                sdhci_msm_hs400(host, &mmc->ios);
}

static inline void sdhci_msm_init_pwr_irq_wait(struct sdhci_msm_host *msm_host)
{
        init_waitqueue_head(&msm_host->pwr_irq_wait);
}

static inline void sdhci_msm_complete_pwr_irq_wait(
                struct sdhci_msm_host *msm_host)
{
        wake_up(&msm_host->pwr_irq_wait);
}

/*
 * sdhci_msm_check_power_status API should be called when registers writes
 * which can toggle sdhci IO bus ON/OFF or change IO lines HIGH/LOW happens.
 * To what state the register writes will change the IO lines should be passed
 * as the argument req_type. This API will check whether the IO line's state
 * is already the expected state and will wait for power irq only if
 * power irq is expected to be trigerred based on the current IO line state
 * and expected IO line state.
 */
static void sdhci_msm_check_power_status(struct sdhci_host *host, u32 req_type)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        bool done = false;
        u32 val;

        pr_debug("%s: %s: request %d curr_pwr_state %x curr_io_level %x\n",
                        mmc_hostname(host->mmc), __func__, req_type,
                        msm_host->curr_pwr_state, msm_host->curr_io_level);

        /*
         * The power interrupt will not be generated for signal voltage
         * switches if SWITCHABLE_SIGNALING_VOLTAGE in MCI_GENERICS is not set.
         */
        val = readl(msm_host->core_mem + CORE_MCI_GENERICS);
        if ((req_type & REQ_IO_HIGH || req_type & REQ_IO_LOW) &&
            !(val & SWITCHABLE_SIGNALING_VOLTAGE)) {
                return;
        }

        /*
         * The IRQ for request type IO High/LOW will be generated when -
         * there is a state change in 1.8V enable bit (bit 3) of
         * SDHCI_HOST_CONTROL2 register. The reset state of that bit is 0
         * which indicates 3.3V IO voltage. So, when MMC core layer tries
         * to set it to 3.3V before card detection happens, the
         * IRQ doesn't get triggered as there is no state change in this bit.
         * The driver already handles this case by changing the IO voltage
         * level to high as part of controller power up sequence. Hence, check
         * for host->pwr to handle a case where IO voltage high request is
         * issued even before controller power up.
         */
        if ((req_type & REQ_IO_HIGH) && !host->pwr) {
                pr_debug("%s: do not wait for power IRQ that never comes, req_type: %d\n",
                                mmc_hostname(host->mmc), req_type);
                return;
        }
        if ((req_type & msm_host->curr_pwr_state) ||
                        (req_type & msm_host->curr_io_level))
                done = true;
        /*
         * This is needed here to handle cases where register writes will
         * not change the current bus state or io level of the controller.
         * In this case, no power irq will be triggerred and we should
         * not wait.
         */
        if (!done) {
                if (!wait_event_timeout(msm_host->pwr_irq_wait,
                                msm_host->pwr_irq_flag,
                                msecs_to_jiffies(MSM_PWR_IRQ_TIMEOUT_MS)))
                        dev_warn(&msm_host->pdev->dev,
                                 "%s: pwr_irq for req: (%d) timed out\n",
                                 mmc_hostname(host->mmc), req_type);
        }
        pr_debug("%s: %s: request %d done\n", mmc_hostname(host->mmc),
                        __func__, req_type);
}

static void sdhci_msm_dump_pwr_ctrl_regs(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);

        pr_err("%s: PWRCTL_STATUS: 0x%08x | PWRCTL_MASK: 0x%08x | PWRCTL_CTL: 0x%08x\n",
                        mmc_hostname(host->mmc),
                        readl_relaxed(msm_host->core_mem + CORE_PWRCTL_STATUS),
                        readl_relaxed(msm_host->core_mem + CORE_PWRCTL_MASK),
                        readl_relaxed(msm_host->core_mem + CORE_PWRCTL_CTL));
}

static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        u32 irq_status, irq_ack = 0;
        int retry = 10;
        int pwr_state = 0, io_level = 0;


        irq_status = readl_relaxed(msm_host->core_mem + CORE_PWRCTL_STATUS);
        irq_status &= INT_MASK;

        writel_relaxed(irq_status, msm_host->core_mem + CORE_PWRCTL_CLEAR);

        /*
         * There is a rare HW scenario where the first clear pulse could be
         * lost when actual reset and clear/read of status register is
         * happening at a time. Hence, retry for at least 10 times to make
         * sure status register is cleared. Otherwise, this will result in
         * a spurious power IRQ resulting in system instability.
         */
        while (irq_status & readl_relaxed(msm_host->core_mem +
                                CORE_PWRCTL_STATUS)) {
                if (retry == 0) {
                        pr_err("%s: Timedout clearing (0x%x) pwrctl status register\n",
                                        mmc_hostname(host->mmc), irq_status);
                        sdhci_msm_dump_pwr_ctrl_regs(host);
                        WARN_ON(1);
                        break;
                }
                writel_relaxed(irq_status,
                                msm_host->core_mem + CORE_PWRCTL_CLEAR);
                retry--;
                udelay(10);
        }

        /* Handle BUS ON/OFF*/
        if (irq_status & CORE_PWRCTL_BUS_ON) {
                pwr_state = REQ_BUS_ON;
                io_level = REQ_IO_HIGH;
                irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
        }
        if (irq_status & CORE_PWRCTL_BUS_OFF) {
                pwr_state = REQ_BUS_OFF;
                io_level = REQ_IO_LOW;
                irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
        }
        /* Handle IO LOW/HIGH */
        if (irq_status & CORE_PWRCTL_IO_LOW) {
                io_level = REQ_IO_LOW;
                irq_ack |= CORE_PWRCTL_IO_SUCCESS;
        }
        if (irq_status & CORE_PWRCTL_IO_HIGH) {
                io_level = REQ_IO_HIGH;
                irq_ack |= CORE_PWRCTL_IO_SUCCESS;
        }

        /*
         * The driver has to acknowledge the interrupt, switch voltages and
         * report back if it succeded or not to this register. The voltage
         * switches are handled by the sdhci core, so just report success.
         */
        writel_relaxed(irq_ack, msm_host->core_mem + CORE_PWRCTL_CTL);

        if (pwr_state)
                msm_host->curr_pwr_state = pwr_state;
        if (io_level)
                msm_host->curr_io_level = io_level;

        pr_debug("%s: %s: Handled IRQ(%d), irq_status=0x%x, ack=0x%x\n",
                mmc_hostname(msm_host->mmc), __func__, irq, irq_status,
                irq_ack);
}

static irqreturn_t sdhci_msm_pwr_irq(int irq, void *data)
{
        struct sdhci_host *host = (struct sdhci_host *)data;
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);

        sdhci_msm_handle_pwr_irq(host, irq);
        msm_host->pwr_irq_flag = 1;
        sdhci_msm_complete_pwr_irq_wait(msm_host);


        return IRQ_HANDLED;
}

static unsigned int sdhci_msm_get_max_clock(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        struct clk *core_clk = msm_host->bulk_clks[0].clk;

        return clk_round_rate(core_clk, ULONG_MAX);
}

static unsigned int sdhci_msm_get_min_clock(struct sdhci_host *host)
{
        return SDHCI_MSM_MIN_CLOCK;
}

/**
 * __sdhci_msm_set_clock - sdhci_msm clock control.
 *
 * Description:
 * MSM controller does not use internal divider and
 * instead directly control the GCC clock as per
 * HW recommendation.
 **/
static void __sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
{
        u16 clk;
        /*
         * Keep actual_clock as zero -
         * - since there is no divider used so no need of having actual_clock.
         * - MSM controller uses SDCLK for data timeout calculation. If
         *   actual_clock is zero, host->clock is taken for calculation.
         */
        host->mmc->actual_clock = 0;

        sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);

        if (clock == 0)
                return;

        /*
         * MSM controller do not use clock divider.
         * Thus read SDHCI_CLOCK_CONTROL and only enable
         * clock with no divider value programmed.
         */
        clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
        sdhci_enable_clk(host, clk);
}

/* sdhci_msm_set_clock - Called with (host->lock) spinlock held. */
static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);

        if (!clock) {
                msm_host->clk_rate = clock;
                goto out;
        }

        sdhci_msm_hc_select_mode(host);

        msm_set_clock_rate_for_bus_mode(host, clock);
out:
        __sdhci_msm_set_clock(host, clock);
}

/*
 * Platform specific register write functions. This is so that, if any
 * register write needs to be followed up by platform specific actions,
 * they can be added here. These functions can go to sleep when writes
 * to certain registers are done.
 * These functions are relying on sdhci_set_ios not using spinlock.
 */
static int __sdhci_msm_check_write(struct sdhci_host *host, u16 val, int reg)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        u32 req_type = 0;

        switch (reg) {
        case SDHCI_HOST_CONTROL2:
                req_type = (val & SDHCI_CTRL_VDD_180) ? REQ_IO_LOW :
                        REQ_IO_HIGH;
                break;
        case SDHCI_SOFTWARE_RESET:
                if (host->pwr && (val & SDHCI_RESET_ALL))
                        req_type = REQ_BUS_OFF;
                break;
        case SDHCI_POWER_CONTROL:
                req_type = !val ? REQ_BUS_OFF : REQ_BUS_ON;
                break;
        case SDHCI_TRANSFER_MODE:
                msm_host->transfer_mode = val;
                break;
        case SDHCI_COMMAND:
                if (!msm_host->use_cdr)
                        break;
                if ((msm_host->transfer_mode & SDHCI_TRNS_READ) &&
                    SDHCI_GET_CMD(val) != MMC_SEND_TUNING_BLOCK_HS200 &&
                    SDHCI_GET_CMD(val) != MMC_SEND_TUNING_BLOCK)
                        sdhci_msm_set_cdr(host, true);
                else
                        sdhci_msm_set_cdr(host, false);
                break;
        }

        if (req_type) {
                msm_host->pwr_irq_flag = 0;
                /*
                 * Since this register write may trigger a power irq, ensure
                 * all previous register writes are complete by this point.
                 */
                mb();
        }
        return req_type;
}

/* This function may sleep*/
static void sdhci_msm_writew(struct sdhci_host *host, u16 val, int reg)
{
        u32 req_type = 0;

        req_type = __sdhci_msm_check_write(host, val, reg);
        writew_relaxed(val, host->ioaddr + reg);

        if (req_type)
                sdhci_msm_check_power_status(host, req_type);
}

/* This function may sleep*/
static void sdhci_msm_writeb(struct sdhci_host *host, u8 val, int reg)
{
        u32 req_type = 0;

        req_type = __sdhci_msm_check_write(host, val, reg);

        writeb_relaxed(val, host->ioaddr + reg);

        if (req_type)
                sdhci_msm_check_power_status(host, req_type);
}

static const struct of_device_id sdhci_msm_dt_match[] = {
        { .compatible = "qcom,sdhci-msm-v4" },
        {},
};

MODULE_DEVICE_TABLE(of, sdhci_msm_dt_match);

static const struct sdhci_ops sdhci_msm_ops = {
        .reset = sdhci_reset,
        .set_clock = sdhci_msm_set_clock,
        .get_min_clock = sdhci_msm_get_min_clock,
        .get_max_clock = sdhci_msm_get_max_clock,
        .set_bus_width = sdhci_set_bus_width,
        .set_uhs_signaling = sdhci_msm_set_uhs_signaling,
        .write_w = sdhci_msm_writew,
        .write_b = sdhci_msm_writeb,
};

static const struct sdhci_pltfm_data sdhci_msm_pdata = {
        .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
                  SDHCI_QUIRK_NO_CARD_NO_RESET |
                  SDHCI_QUIRK_SINGLE_POWER_WRITE |
                  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
        .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
        .ops = &sdhci_msm_ops,
};

static int sdhci_msm_probe(struct platform_device *pdev)
{
        struct sdhci_host *host;
        struct sdhci_pltfm_host *pltfm_host;
        struct sdhci_msm_host *msm_host;
        struct resource *core_memres;
        struct clk *clk;
        int ret;
        u16 host_version, core_minor;
        u32 core_version, config;
        u8 core_major;

        host = sdhci_pltfm_init(pdev, &sdhci_msm_pdata, sizeof(*msm_host));
        if (IS_ERR(host))
                return PTR_ERR(host);

        host->sdma_boundary = 0;
        pltfm_host = sdhci_priv(host);
        msm_host = sdhci_pltfm_priv(pltfm_host);
        msm_host->mmc = host->mmc;
        msm_host->pdev = pdev;

        ret = mmc_of_parse(host->mmc);
        if (ret)
                goto pltfm_free;

        sdhci_get_of_property(pdev);

        msm_host->saved_tuning_phase = INVALID_TUNING_PHASE;

        /* Setup SDCC bus voter clock. */
        msm_host->bus_clk = devm_clk_get(&pdev->dev, "bus");
        if (!IS_ERR(msm_host->bus_clk)) {
                /* Vote for max. clk rate for max. performance */
                ret = clk_set_rate(msm_host->bus_clk, INT_MAX);
                if (ret)
                        goto pltfm_free;
                ret = clk_prepare_enable(msm_host->bus_clk);
                if (ret)
                        goto pltfm_free;
        }

        /* Setup main peripheral bus clock */
        clk = devm_clk_get(&pdev->dev, "iface");
        if (IS_ERR(clk)) {
                ret = PTR_ERR(clk);
                dev_err(&pdev->dev, "Peripheral clk setup failed (%d)\n", ret);
                goto bus_clk_disable;
        }
        msm_host->bulk_clks[1].clk = clk;

        /* Setup SDC MMC clock */
        clk = devm_clk_get(&pdev->dev, "core");
        if (IS_ERR(clk)) {
                ret = PTR_ERR(clk);
                dev_err(&pdev->dev, "SDC MMC clk setup failed (%d)\n", ret);
                goto bus_clk_disable;
        }
        msm_host->bulk_clks[0].clk = clk;

        /* Vote for maximum clock rate for maximum performance */
        ret = clk_set_rate(clk, INT_MAX);
        if (ret)
                dev_warn(&pdev->dev, "core clock boost failed\n");

        clk = devm_clk_get(&pdev->dev, "cal");
        if (IS_ERR(clk))
                clk = NULL;
        msm_host->bulk_clks[2].clk = clk;

        clk = devm_clk_get(&pdev->dev, "sleep");
        if (IS_ERR(clk))
                clk = NULL;
        msm_host->bulk_clks[3].clk = clk;

        ret = clk_bulk_prepare_enable(ARRAY_SIZE(msm_host->bulk_clks),
                                      msm_host->bulk_clks);
        if (ret)
                goto bus_clk_disable;

        /*
         * xo clock is needed for FLL feature of cm_dll.
         * In case if xo clock is not mentioned in DT, warn and proceed.
         */
        msm_host->xo_clk = devm_clk_get(&pdev->dev, "xo");
        if (IS_ERR(msm_host->xo_clk)) {
                ret = PTR_ERR(msm_host->xo_clk);
                dev_warn(&pdev->dev, "TCXO clk not present (%d)\n", ret);
        }

        core_memres = platform_get_resource(pdev, IORESOURCE_MEM, 1);
        msm_host->core_mem = devm_ioremap_resource(&pdev->dev, core_memres);

        if (IS_ERR(msm_host->core_mem)) {
                dev_err(&pdev->dev, "Failed to remap registers\n");
                ret = PTR_ERR(msm_host->core_mem);
                goto clk_disable;
        }

        /* Reset the vendor spec register to power on reset state */
        writel_relaxed(CORE_VENDOR_SPEC_POR_VAL,
                       host->ioaddr + CORE_VENDOR_SPEC);

        /* Set HC_MODE_EN bit in HC_MODE register */
        writel_relaxed(HC_MODE_EN, (msm_host->core_mem + CORE_HC_MODE));

        config = readl_relaxed(msm_host->core_mem + CORE_HC_MODE);
        config |= FF_CLK_SW_RST_DIS;
        writel_relaxed(config, msm_host->core_mem + CORE_HC_MODE);

        host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));
        dev_dbg(&pdev->dev, "Host Version: 0x%x Vendor Version 0x%x\n",
                host_version, ((host_version & SDHCI_VENDOR_VER_MASK) >>
                               SDHCI_VENDOR_VER_SHIFT));

        core_version = readl_relaxed(msm_host->core_mem + CORE_MCI_VERSION);
        core_major = (core_version & CORE_VERSION_MAJOR_MASK) >>
                      CORE_VERSION_MAJOR_SHIFT;
        core_minor = core_version & CORE_VERSION_MINOR_MASK;
        dev_dbg(&pdev->dev, "MCI Version: 0x%08x, major: 0x%04x, minor: 0x%02x\n",
                core_version, core_major, core_minor);

        if (core_major == 1 && core_minor >= 0x42)
                msm_host->use_14lpp_dll_reset = true;

        /*
         * SDCC 5 controller with major version 1, minor version 0x34 and later
         * with HS 400 mode support will use CM DLL instead of CDC LP 533 DLL.
         */
        if (core_major == 1 && core_minor < 0x34)
                msm_host->use_cdclp533 = true;

        /*
         * Support for some capabilities is not advertised by newer
         * controller versions and must be explicitly enabled.
         */
        if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) {
                config = readl_relaxed(host->ioaddr + SDHCI_CAPABILITIES);
                config |= SDHCI_CAN_VDD_300 | SDHCI_CAN_DO_8BIT;
                writel_relaxed(config, host->ioaddr +
                               CORE_VENDOR_SPEC_CAPABILITIES0);
        }

        /*
         * Power on reset state may trigger power irq if previous status of
         * PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq
         * interrupt in GIC, any pending power irq interrupt should be
         * acknowledged. Otherwise power irq interrupt handler would be
         * fired prematurely.
         */
        sdhci_msm_handle_pwr_irq(host, 0);

        /*
         * Ensure that above writes are propogated before interrupt enablement
         * in GIC.
         */
        mb();

        /* Setup IRQ for handling power/voltage tasks with PMIC */
        msm_host->pwr_irq = platform_get_irq_byname(pdev, "pwr_irq");
        if (msm_host->pwr_irq < 0) {
                dev_err(&pdev->dev, "Get pwr_irq failed (%d)\n",
                        msm_host->pwr_irq);
                ret = msm_host->pwr_irq;
                goto clk_disable;
        }

        sdhci_msm_init_pwr_irq_wait(msm_host);
        /* Enable pwr irq interrupts */
        writel_relaxed(INT_MASK, msm_host->core_mem + CORE_PWRCTL_MASK);

        ret = devm_request_threaded_irq(&pdev->dev, msm_host->pwr_irq, NULL,
                                        sdhci_msm_pwr_irq, IRQF_ONESHOT,
                                        dev_name(&pdev->dev), host);
        if (ret) {
                dev_err(&pdev->dev, "Request IRQ failed (%d)\n", ret);
                goto clk_disable;
        }

        pm_runtime_get_noresume(&pdev->dev);
        pm_runtime_set_active(&pdev->dev);
        pm_runtime_enable(&pdev->dev);
        pm_runtime_set_autosuspend_delay(&pdev->dev,
                                         MSM_MMC_AUTOSUSPEND_DELAY_MS);
        pm_runtime_use_autosuspend(&pdev->dev);

        host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning;
        ret = sdhci_add_host(host);
        if (ret)
                goto pm_runtime_disable;

        pm_runtime_mark_last_busy(&pdev->dev);
        pm_runtime_put_autosuspend(&pdev->dev);

        return 0;

pm_runtime_disable:
        pm_runtime_disable(&pdev->dev);
        pm_runtime_set_suspended(&pdev->dev);
        pm_runtime_put_noidle(&pdev->dev);
clk_disable:
        clk_bulk_disable_unprepare(ARRAY_SIZE(msm_host->bulk_clks),
                                   msm_host->bulk_clks);
bus_clk_disable:
        if (!IS_ERR(msm_host->bus_clk))
                clk_disable_unprepare(msm_host->bus_clk);
pltfm_free:
        sdhci_pltfm_free(pdev);
        return ret;
}

static int sdhci_msm_remove(struct platform_device *pdev)
{
        struct sdhci_host *host = platform_get_drvdata(pdev);
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
        int dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) ==
                    0xffffffff);

        sdhci_remove_host(host, dead);

        pm_runtime_get_sync(&pdev->dev);
        pm_runtime_disable(&pdev->dev);
        pm_runtime_put_noidle(&pdev->dev);

        clk_bulk_disable_unprepare(ARRAY_SIZE(msm_host->bulk_clks),
                                   msm_host->bulk_clks);
        if (!IS_ERR(msm_host->bus_clk))
                clk_disable_unprepare(msm_host->bus_clk);
        sdhci_pltfm_free(pdev);
        return 0;
}

#ifdef CONFIG_PM
static int sdhci_msm_runtime_suspend(struct device *dev)
{
        struct sdhci_host *host = dev_get_drvdata(dev);
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);

        clk_bulk_disable_unprepare(ARRAY_SIZE(msm_host->bulk_clks),
                                   msm_host->bulk_clks);

        return 0;
}

static int sdhci_msm_runtime_resume(struct device *dev)
{
        struct sdhci_host *host = dev_get_drvdata(dev);
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);

        return clk_bulk_prepare_enable(ARRAY_SIZE(msm_host->bulk_clks),
                                       msm_host->bulk_clks);
}
#endif

static const struct dev_pm_ops sdhci_msm_pm_ops = {
        SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
                                pm_runtime_force_resume)
        SET_RUNTIME_PM_OPS(sdhci_msm_runtime_suspend,
                           sdhci_msm_runtime_resume,
                           NULL)
};

static struct platform_driver sdhci_msm_driver = {
        .probe = sdhci_msm_probe,
        .remove = sdhci_msm_remove,
        .driver = {
                   .name = "sdhci_msm",
                   .of_match_table = sdhci_msm_dt_match,
                   .pm = &sdhci_msm_pm_ops,
        },
};

module_platform_driver(sdhci_msm_driver);

MODULE_DESCRIPTION("Qualcomm Secure Digital Host Controller Interface driver");
MODULE_LICENSE("GPL v2");