// SPDX-License-Identifier: GPL-2.0+
//
// Freescale ALSA SoC Digital Audio Interface (SAI) driver.
//
// Copyright 2012-2015 Freescale Semiconductor, Inc.

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/pm_qos.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>

#include "fsl_sai.h"
#include "imx-pcm.h"

#define FSL_SAI_FLAGS (FSL_SAI_CSR_SEIE |\
                       FSL_SAI_CSR_FEIE)

static const unsigned int fsl_sai_rates[] = {
        8000, 11025, 12000, 16000, 22050,
        24000, 32000, 44100, 48000, 64000,
        88200, 96000, 176400, 192000
};

static const struct snd_pcm_hw_constraint_list fsl_sai_rate_constraints = {
        .count = ARRAY_SIZE(fsl_sai_rates),
        .list = fsl_sai_rates,
};

/**
 * fsl_sai_dir_is_synced - Check if stream is synced by the opposite stream
 *
 * SAI supports synchronous mode using bit/frame clocks of either Transmitter's
 * or Receiver's for both streams. This function is used to check if clocks of
 * the stream's are synced by the opposite stream.
 *
 * @sai: SAI context
 * @dir: stream direction
 */
static inline bool fsl_sai_dir_is_synced(struct fsl_sai *sai, int dir)
{
        int adir = (dir == TX) ? RX : TX;

        /* current dir in async mode while opposite dir in sync mode */
        return !sai->synchronous[dir] && sai->synchronous[adir];
}

static irqreturn_t fsl_sai_isr(int irq, void *devid)
{
        struct fsl_sai *sai = (struct fsl_sai *)devid;
        unsigned int ofs = sai->soc_data->reg_offset;
        struct device *dev = &sai->pdev->dev;
        u32 flags, xcsr, mask;
        bool irq_none = true;

        /*
         * Both IRQ status bits and IRQ mask bits are in the xCSR but
         * different shifts. And we here create a mask only for those
         * IRQs that we activated.
         */
        mask = (FSL_SAI_FLAGS >> FSL_SAI_CSR_xIE_SHIFT) << FSL_SAI_CSR_xF_SHIFT;

        /* Tx IRQ */
        regmap_read(sai->regmap, FSL_SAI_TCSR(ofs), &xcsr);
        flags = xcsr & mask;

        if (flags)
                irq_none = false;
        else
                goto irq_rx;

        if (flags & FSL_SAI_CSR_WSF)
                dev_dbg(dev, "isr: Start of Tx word detected\n");

        if (flags & FSL_SAI_CSR_SEF)
                dev_dbg(dev, "isr: Tx Frame sync error detected\n");

        if (flags & FSL_SAI_CSR_FEF) {
                dev_dbg(dev, "isr: Transmit underrun detected\n");
                /* FIFO reset for safety */
                xcsr |= FSL_SAI_CSR_FR;
        }

        if (flags & FSL_SAI_CSR_FWF)
                dev_dbg(dev, "isr: Enabled transmit FIFO is empty\n");

        if (flags & FSL_SAI_CSR_FRF)
                dev_dbg(dev, "isr: Transmit FIFO watermark has been reached\n");

        flags &= FSL_SAI_CSR_xF_W_MASK;
        xcsr &= ~FSL_SAI_CSR_xF_MASK;

        if (flags)
                regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), flags | xcsr);

irq_rx:
        /* Rx IRQ */
        regmap_read(sai->regmap, FSL_SAI_RCSR(ofs), &xcsr);
        flags = xcsr & mask;

        if (flags)
                irq_none = false;
        else
                goto out;

        if (flags & FSL_SAI_CSR_WSF)
                dev_dbg(dev, "isr: Start of Rx word detected\n");

        if (flags & FSL_SAI_CSR_SEF)
                dev_dbg(dev, "isr: Rx Frame sync error detected\n");

        if (flags & FSL_SAI_CSR_FEF) {
                dev_dbg(dev, "isr: Receive overflow detected\n");
                /* FIFO reset for safety */
                xcsr |= FSL_SAI_CSR_FR;
        }

        if (flags & FSL_SAI_CSR_FWF)
                dev_dbg(dev, "isr: Enabled receive FIFO is full\n");

        if (flags & FSL_SAI_CSR_FRF)
                dev_dbg(dev, "isr: Receive FIFO watermark has been reached\n");

        flags &= FSL_SAI_CSR_xF_W_MASK;
        xcsr &= ~FSL_SAI_CSR_xF_MASK;

        if (flags)
                regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), flags | xcsr);

out:
        if (irq_none)
                return IRQ_NONE;
        else
                return IRQ_HANDLED;
}

static int fsl_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask,
                                u32 rx_mask, int slots, int slot_width)
{
        struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);

        sai->slots = slots;
        sai->slot_width = slot_width;

        return 0;
}

static int fsl_sai_set_dai_bclk_ratio(struct snd_soc_dai *dai,
                                      unsigned int ratio)
{
        struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);

        sai->bclk_ratio = ratio;

        return 0;
}

static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
                int clk_id, unsigned int freq, int fsl_dir)
{
        struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
        unsigned int ofs = sai->soc_data->reg_offset;
        bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
        u32 val_cr2 = 0;

        switch (clk_id) {
        case FSL_SAI_CLK_BUS:
                val_cr2 |= FSL_SAI_CR2_MSEL_BUS;
                break;
        case FSL_SAI_CLK_MAST1:
                val_cr2 |= FSL_SAI_CR2_MSEL_MCLK1;
                break;
        case FSL_SAI_CLK_MAST2:
                val_cr2 |= FSL_SAI_CR2_MSEL_MCLK2;
                break;
        case FSL_SAI_CLK_MAST3:
                val_cr2 |= FSL_SAI_CR2_MSEL_MCLK3;
                break;
        default:
                return -EINVAL;
        }

        regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx, ofs),
                           FSL_SAI_CR2_MSEL_MASK, val_cr2);

        return 0;
}

static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
                int clk_id, unsigned int freq, int dir)
{
        int ret;

        if (dir == SND_SOC_CLOCK_IN)
                return 0;

        ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
                                        FSL_FMT_TRANSMITTER);
        if (ret) {
                dev_err(cpu_dai->dev, "Cannot set tx sysclk: %d\n", ret);
                return ret;
        }

        ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
                                        FSL_FMT_RECEIVER);
        if (ret)
                dev_err(cpu_dai->dev, "Cannot set rx sysclk: %d\n", ret);

        return ret;
}

static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
                                unsigned int fmt, int fsl_dir)
{
        struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
        unsigned int ofs = sai->soc_data->reg_offset;
        bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
        u32 val_cr2 = 0, val_cr4 = 0;

        if (!sai->is_lsb_first)
                val_cr4 |= FSL_SAI_CR4_MF;

        /* DAI mode */
        switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
        case SND_SOC_DAIFMT_I2S:
                /*
                 * Frame low, 1clk before data, one word length for frame sync,
                 * frame sync starts one serial clock cycle earlier,
                 * that is, together with the last bit of the previous
                 * data word.
                 */
                val_cr2 |= FSL_SAI_CR2_BCP;
                val_cr4 |= FSL_SAI_CR4_FSE | FSL_SAI_CR4_FSP;
                break;
        case SND_SOC_DAIFMT_LEFT_J:
                /*
                 * Frame high, one word length for frame sync,
                 * frame sync asserts with the first bit of the frame.
                 */
                val_cr2 |= FSL_SAI_CR2_BCP;
                break;
        case SND_SOC_DAIFMT_DSP_A:
                /*
                 * Frame high, 1clk before data, one bit for frame sync,
                 * frame sync starts one serial clock cycle earlier,
                 * that is, together with the last bit of the previous
                 * data word.
                 */
                val_cr2 |= FSL_SAI_CR2_BCP;
                val_cr4 |= FSL_SAI_CR4_FSE;
                sai->is_dsp_mode = true;
                break;
        case SND_SOC_DAIFMT_DSP_B:
                /*
                 * Frame high, one bit for frame sync,
                 * frame sync asserts with the first bit of the frame.
                 */
                val_cr2 |= FSL_SAI_CR2_BCP;
                sai->is_dsp_mode = true;
                break;
        case SND_SOC_DAIFMT_RIGHT_J:
                /* To be done */
        default:
                return -EINVAL;
        }

        /* DAI clock inversion */
        switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
        case SND_SOC_DAIFMT_IB_IF:
                /* Invert both clocks */
                val_cr2 ^= FSL_SAI_CR2_BCP;
                val_cr4 ^= FSL_SAI_CR4_FSP;
                break;
        case SND_SOC_DAIFMT_IB_NF:
                /* Invert bit clock */
                val_cr2 ^= FSL_SAI_CR2_BCP;
                break;
        case SND_SOC_DAIFMT_NB_IF:
                /* Invert frame clock */
                val_cr4 ^= FSL_SAI_CR4_FSP;
                break;
        case SND_SOC_DAIFMT_NB_NF:
                /* Nothing to do for both normal cases */
                break;
        default:
                return -EINVAL;
        }

        /* DAI clock master masks */
        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
        case SND_SOC_DAIFMT_CBS_CFS:
                val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
                val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
                sai->is_slave_mode = false;
                break;
        case SND_SOC_DAIFMT_CBM_CFM:
                sai->is_slave_mode = true;
                break;
        case SND_SOC_DAIFMT_CBS_CFM:
                val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
                sai->is_slave_mode = false;
                break;
        case SND_SOC_DAIFMT_CBM_CFS:
                val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
                sai->is_slave_mode = true;
                break;
        default:
                return -EINVAL;
        }

        regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx, ofs),
                           FSL_SAI_CR2_BCP | FSL_SAI_CR2_BCD_MSTR, val_cr2);
        regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx, ofs),
                           FSL_SAI_CR4_MF | FSL_SAI_CR4_FSE |
                           FSL_SAI_CR4_FSP | FSL_SAI_CR4_FSD_MSTR, val_cr4);

        return 0;
}

static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
{
        int ret;

        ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_TRANSMITTER);
        if (ret) {
                dev_err(cpu_dai->dev, "Cannot set tx format: %d\n", ret);
                return ret;
        }

        ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_RECEIVER);
        if (ret)
                dev_err(cpu_dai->dev, "Cannot set rx format: %d\n", ret);

        return ret;
}

static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
{
        struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
        unsigned int ofs = sai->soc_data->reg_offset;
        unsigned long clk_rate;
        u32 savediv = 0, ratio, savesub = freq;
        int adir = tx ? RX : TX;
        int dir = tx ? TX : RX;
        u32 id;
        int ret = 0;

        /* Don't apply to slave mode */
        if (sai->is_slave_mode)
                return 0;

        /*
         * There is no point in polling MCLK0 if it is identical to MCLK1.
         * And given that MQS use case has to use MCLK1 though two clocks
         * are the same, we simply skip MCLK0 and start to find from MCLK1.
         */
        id = sai->soc_data->mclk0_is_mclk1 ? 1 : 0;

        for (; id < FSL_SAI_MCLK_MAX; id++) {
                clk_rate = clk_get_rate(sai->mclk_clk[id]);
                if (!clk_rate)
                        continue;

                ratio = clk_rate / freq;

                ret = clk_rate - ratio * freq;

                /*
                 * Drop the source that can not be
                 * divided into the required rate.
                 */
                if (ret != 0 && clk_rate / ret < 1000)
                        continue;

                dev_dbg(dai->dev,
                        "ratio %d for freq %dHz based on clock %ldHz\n",
                        ratio, freq, clk_rate);

                if (ratio % 2 == 0 && ratio >= 2 && ratio <= 512)
                        ratio /= 2;
                else
                        continue;

                if (ret < savesub) {
                        savediv = ratio;
                        sai->mclk_id[tx] = id;
                        savesub = ret;
                }

                if (ret == 0)
                        break;
        }

        if (savediv == 0) {
                dev_err(dai->dev, "failed to derive required %cx rate: %d\n",
                                tx ? 'T' : 'R', freq);
                return -EINVAL;
        }

        /*
         * 1) For Asynchronous mode, we must set RCR2 register for capture, and
         *    set TCR2 register for playback.
         * 2) For Tx sync with Rx clock, we must set RCR2 register for playback
         *    and capture.
         * 3) For Rx sync with Tx clock, we must set TCR2 register for playback
         *    and capture.
         * 4) For Tx and Rx are both Synchronous with another SAI, we just
         *    ignore it.
         */
        if (fsl_sai_dir_is_synced(sai, adir)) {
                regmap_update_bits(sai->regmap, FSL_SAI_xCR2(!tx, ofs),
                                   FSL_SAI_CR2_MSEL_MASK,
                                   FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
                regmap_update_bits(sai->regmap, FSL_SAI_xCR2(!tx, ofs),
                                   FSL_SAI_CR2_DIV_MASK, savediv - 1);
        } else if (!sai->synchronous[dir]) {
                regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx, ofs),
                                   FSL_SAI_CR2_MSEL_MASK,
                                   FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
                regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx, ofs),
                                   FSL_SAI_CR2_DIV_MASK, savediv - 1);
        }

        dev_dbg(dai->dev, "best fit: clock id=%d, div=%d, deviation =%d\n",
                        sai->mclk_id[tx], savediv, savesub);

        return 0;
}

static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
                struct snd_pcm_hw_params *params,
                struct snd_soc_dai *cpu_dai)
{
        struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
        unsigned int ofs = sai->soc_data->reg_offset;
        bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
        unsigned int channels = params_channels(params);
        u32 word_width = params_width(params);
        u32 val_cr4 = 0, val_cr5 = 0;
        u32 slots = (channels == 1) ? 2 : channels;
        u32 slot_width = word_width;
        int adir = tx ? RX : TX;
        u32 pins;
        int ret;

        if (sai->slots)
                slots = sai->slots;

        if (sai->slot_width)
                slot_width = sai->slot_width;

        pins = DIV_ROUND_UP(channels, slots);

        if (!sai->is_slave_mode) {
                if (sai->bclk_ratio)
                        ret = fsl_sai_set_bclk(cpu_dai, tx,
                                               sai->bclk_ratio *
                                               params_rate(params));
                else
                        ret = fsl_sai_set_bclk(cpu_dai, tx,
                                               slots * slot_width *
                                               params_rate(params));
                if (ret)
                        return ret;

                /* Do not enable the clock if it is already enabled */
                if (!(sai->mclk_streams & BIT(substream->stream))) {
                        ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[tx]]);
                        if (ret)
                                return ret;

                        sai->mclk_streams |= BIT(substream->stream);
                }
        }

        if (!sai->is_dsp_mode)
                val_cr4 |= FSL_SAI_CR4_SYWD(slot_width);

        val_cr5 |= FSL_SAI_CR5_WNW(slot_width);
        val_cr5 |= FSL_SAI_CR5_W0W(slot_width);

        if (sai->is_lsb_first)
                val_cr5 |= FSL_SAI_CR5_FBT(0);
        else
                val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1);

        val_cr4 |= FSL_SAI_CR4_FRSZ(slots);

        /* Set to output mode to avoid tri-stated data pins */
        if (tx)
                val_cr4 |= FSL_SAI_CR4_CHMOD;

        /*
         * For SAI master mode, when Tx(Rx) sync with Rx(Tx) clock, Rx(Tx) will
         * generate bclk and frame clock for Tx(Rx), we should set RCR4(TCR4),
         * RCR5(TCR5) for playback(capture), or there will be sync error.
         */

        if (!sai->is_slave_mode && fsl_sai_dir_is_synced(sai, adir)) {
                regmap_update_bits(sai->regmap, FSL_SAI_xCR4(!tx, ofs),
                                   FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK |
                                   FSL_SAI_CR4_CHMOD_MASK,
                                   val_cr4);
                regmap_update_bits(sai->regmap, FSL_SAI_xCR5(!tx, ofs),
                                   FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
                                   FSL_SAI_CR5_FBT_MASK, val_cr5);
        }

        regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx, ofs),
                           FSL_SAI_CR3_TRCE_MASK,
                           FSL_SAI_CR3_TRCE((1 << pins) - 1));
        regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx, ofs),
                           FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK |
                           FSL_SAI_CR4_CHMOD_MASK,
                           val_cr4);
        regmap_update_bits(sai->regmap, FSL_SAI_xCR5(tx, ofs),
                           FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
                           FSL_SAI_CR5_FBT_MASK, val_cr5);
        regmap_write(sai->regmap, FSL_SAI_xMR(tx),
                     ~0UL - ((1 << min(channels, slots)) - 1));

        return 0;
}

static int fsl_sai_hw_free(struct snd_pcm_substream *substream,
                struct snd_soc_dai *cpu_dai)
{
        struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
        bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
        unsigned int ofs = sai->soc_data->reg_offset;

        regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx, ofs),
                           FSL_SAI_CR3_TRCE_MASK, 0);

        if (!sai->is_slave_mode &&
                        sai->mclk_streams & BIT(substream->stream)) {
                clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[tx]]);
                sai->mclk_streams &= ~BIT(substream->stream);
        }

        return 0;
}

static void fsl_sai_config_disable(struct fsl_sai *sai, int dir)
{
        unsigned int ofs = sai->soc_data->reg_offset;
        bool tx = dir == TX;
        u32 xcsr, count = 100;

        regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
                           FSL_SAI_CSR_TERE, 0);

        /* TERE will remain set till the end of current frame */
        do {
                udelay(10);
                regmap_read(sai->regmap, FSL_SAI_xCSR(tx, ofs), &xcsr);
        } while (--count && xcsr & FSL_SAI_CSR_TERE);

        regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
                           FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);

        /*
         * For sai master mode, after several open/close sai,
         * there will be no frame clock, and can't recover
         * anymore. Add software reset to fix this issue.
         * This is a hardware bug, and will be fix in the
         * next sai version.
         */
        if (!sai->is_slave_mode) {
                /* Software Reset */
                regmap_write(sai->regmap, FSL_SAI_xCSR(tx, ofs), FSL_SAI_CSR_SR);
                /* Clear SR bit to finish the reset */
                regmap_write(sai->regmap, FSL_SAI_xCSR(tx, ofs), 0);
        }
}

static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
                struct snd_soc_dai *cpu_dai)
{
        struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
        unsigned int ofs = sai->soc_data->reg_offset;

        bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
        int adir = tx ? RX : TX;
        int dir = tx ? TX : RX;
        u32 xcsr;

        /*
         * Asynchronous mode: Clear SYNC for both Tx and Rx.
         * Rx sync with Tx clocks: Clear SYNC for Tx, set it for Rx.
         * Tx sync with Rx clocks: Clear SYNC for Rx, set it for Tx.
         */
        regmap_update_bits(sai->regmap, FSL_SAI_TCR2(ofs), FSL_SAI_CR2_SYNC,
                           sai->synchronous[TX] ? FSL_SAI_CR2_SYNC : 0);
        regmap_update_bits(sai->regmap, FSL_SAI_RCR2(ofs), FSL_SAI_CR2_SYNC,
                           sai->synchronous[RX] ? FSL_SAI_CR2_SYNC : 0);

        /*
         * It is recommended that the transmitter is the last enabled
         * and the first disabled.
         */
        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_RESUME:
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
                                   FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);

                regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
                                   FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
                /*
                 * Enable the opposite direction for synchronous mode
                 * 1. Tx sync with Rx: only set RE for Rx; set TE & RE for Tx
                 * 2. Rx sync with Tx: only set TE for Tx; set RE & TE for Rx
                 *
                 * RM recommends to enable RE after TE for case 1 and to enable
                 * TE after RE for case 2, but we here may not always guarantee
                 * that happens: "arecord 1.wav; aplay 2.wav" in case 1 enables
                 * TE after RE, which is against what RM recommends but should
                 * be safe to do, judging by years of testing results.
                 */
                if (fsl_sai_dir_is_synced(sai, adir))
                        regmap_update_bits(sai->regmap, FSL_SAI_xCSR((!tx), ofs),
                                           FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);

                regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
                                   FSL_SAI_CSR_xIE_MASK, FSL_SAI_FLAGS);
                break;
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_SUSPEND:
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
                                   FSL_SAI_CSR_FRDE, 0);
                regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
                                   FSL_SAI_CSR_xIE_MASK, 0);

                /* Check if the opposite FRDE is also disabled */
                regmap_read(sai->regmap, FSL_SAI_xCSR(!tx, ofs), &xcsr);

                /*
                 * If opposite stream provides clocks for synchronous mode and
                 * it is inactive, disable it before disabling the current one
                 */
                if (fsl_sai_dir_is_synced(sai, adir) && !(xcsr & FSL_SAI_CSR_FRDE))
                        fsl_sai_config_disable(sai, adir);

                /*
                 * Disable current stream if either of:
                 * 1. current stream doesn't provide clocks for synchronous mode
                 * 2. current stream provides clocks for synchronous mode but no
                 *    more stream is active.
                 */
                if (!fsl_sai_dir_is_synced(sai, dir) || !(xcsr & FSL_SAI_CSR_FRDE))
                        fsl_sai_config_disable(sai, dir);

                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int fsl_sai_startup(struct snd_pcm_substream *substream,
                struct snd_soc_dai *cpu_dai)
{
        struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
        bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
        int ret;

        /*
         * EDMA controller needs period size to be a multiple of
         * tx/rx maxburst
         */
        if (sai->soc_data->use_edma)
                snd_pcm_hw_constraint_step(substream->runtime, 0,
                                           SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
                                           tx ? sai->dma_params_tx.maxburst :
                                           sai->dma_params_rx.maxburst);

        ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
                        SNDRV_PCM_HW_PARAM_RATE, &fsl_sai_rate_constraints);

        return ret;
}

static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
        .set_bclk_ratio = fsl_sai_set_dai_bclk_ratio,
        .set_sysclk     = fsl_sai_set_dai_sysclk,
        .set_fmt        = fsl_sai_set_dai_fmt,
        .set_tdm_slot   = fsl_sai_set_dai_tdm_slot,
        .hw_params      = fsl_sai_hw_params,
        .hw_free        = fsl_sai_hw_free,
        .trigger        = fsl_sai_trigger,
        .startup        = fsl_sai_startup,
};

static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
{
        struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);
        unsigned int ofs = sai->soc_data->reg_offset;

        /* Software Reset for both Tx and Rx */
        regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), FSL_SAI_CSR_SR);
        regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), FSL_SAI_CSR_SR);
        /* Clear SR bit to finish the reset */
        regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), 0);
        regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), 0);

        regmap_update_bits(sai->regmap, FSL_SAI_TCR1(ofs),
                           FSL_SAI_CR1_RFW_MASK(sai->soc_data->fifo_depth),
                           sai->soc_data->fifo_depth - FSL_SAI_MAXBURST_TX);
        regmap_update_bits(sai->regmap, FSL_SAI_RCR1(ofs),
                           FSL_SAI_CR1_RFW_MASK(sai->soc_data->fifo_depth),
                           FSL_SAI_MAXBURST_RX - 1);

        snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx,
                                &sai->dma_params_rx);

        return 0;
}

static struct snd_soc_dai_driver fsl_sai_dai_template = {
        .probe = fsl_sai_dai_probe,
        .playback = {
                .stream_name = "CPU-Playback",
                .channels_min = 1,
                .channels_max = 32,
                .rate_min = 8000,
                .rate_max = 192000,
                .rates = SNDRV_PCM_RATE_KNOT,
                .formats = FSL_SAI_FORMATS,
        },
        .capture = {
                .stream_name = "CPU-Capture",
                .channels_min = 1,
                .channels_max = 32,
                .rate_min = 8000,
                .rate_max = 192000,
                .rates = SNDRV_PCM_RATE_KNOT,
                .formats = FSL_SAI_FORMATS,
        },
        .ops = &fsl_sai_pcm_dai_ops,
};

static const struct snd_soc_component_driver fsl_component = {
        .name           = "fsl-sai",
};

static struct reg_default fsl_sai_reg_defaults_ofs0[] = {
        {FSL_SAI_TCR1(0), 0},
        {FSL_SAI_TCR2(0), 0},
        {FSL_SAI_TCR3(0), 0},
        {FSL_SAI_TCR4(0), 0},
        {FSL_SAI_TCR5(0), 0},
        {FSL_SAI_TDR0, 0},
        {FSL_SAI_TDR1, 0},
        {FSL_SAI_TDR2, 0},
        {FSL_SAI_TDR3, 0},
        {FSL_SAI_TDR4, 0},
        {FSL_SAI_TDR5, 0},
        {FSL_SAI_TDR6, 0},
        {FSL_SAI_TDR7, 0},
        {FSL_SAI_TMR, 0},
        {FSL_SAI_RCR1(0), 0},
        {FSL_SAI_RCR2(0), 0},
        {FSL_SAI_RCR3(0), 0},
        {FSL_SAI_RCR4(0), 0},
        {FSL_SAI_RCR5(0), 0},
        {FSL_SAI_RMR, 0},
};

static struct reg_default fsl_sai_reg_defaults_ofs8[] = {
        {FSL_SAI_TCR1(8), 0},
        {FSL_SAI_TCR2(8), 0},
        {FSL_SAI_TCR3(8), 0},
        {FSL_SAI_TCR4(8), 0},
        {FSL_SAI_TCR5(8), 0},
        {FSL_SAI_TDR0, 0},
        {FSL_SAI_TDR1, 0},
        {FSL_SAI_TDR2, 0},
        {FSL_SAI_TDR3, 0},
        {FSL_SAI_TDR4, 0},
        {FSL_SAI_TDR5, 0},
        {FSL_SAI_TDR6, 0},
        {FSL_SAI_TDR7, 0},
        {FSL_SAI_TMR, 0},
        {FSL_SAI_RCR1(8), 0},
        {FSL_SAI_RCR2(8), 0},
        {FSL_SAI_RCR3(8), 0},
        {FSL_SAI_RCR4(8), 0},
        {FSL_SAI_RCR5(8), 0},
        {FSL_SAI_RMR, 0},
        {FSL_SAI_MCTL, 0},
        {FSL_SAI_MDIV, 0},
};

static bool fsl_sai_readable_reg(struct device *dev, unsigned int reg)
{
        struct fsl_sai *sai = dev_get_drvdata(dev);
        unsigned int ofs = sai->soc_data->reg_offset;

        if (reg >= FSL_SAI_TCSR(ofs) && reg <= FSL_SAI_TCR5(ofs))
                return true;

        if (reg >= FSL_SAI_RCSR(ofs) && reg <= FSL_SAI_RCR5(ofs))
                return true;

        switch (reg) {
        case FSL_SAI_TFR0:
        case FSL_SAI_TFR1:
        case FSL_SAI_TFR2:
        case FSL_SAI_TFR3:
        case FSL_SAI_TFR4:
        case FSL_SAI_TFR5:
        case FSL_SAI_TFR6:
        case FSL_SAI_TFR7:
        case FSL_SAI_TMR:
        case FSL_SAI_RDR0:
        case FSL_SAI_RDR1:
        case FSL_SAI_RDR2:
        case FSL_SAI_RDR3:
        case FSL_SAI_RDR4:
        case FSL_SAI_RDR5:
        case FSL_SAI_RDR6:
        case FSL_SAI_RDR7:
        case FSL_SAI_RFR0:
        case FSL_SAI_RFR1:
        case FSL_SAI_RFR2:
        case FSL_SAI_RFR3:
        case FSL_SAI_RFR4:
        case FSL_SAI_RFR5:
        case FSL_SAI_RFR6:
        case FSL_SAI_RFR7:
        case FSL_SAI_RMR:
        case FSL_SAI_MCTL:
        case FSL_SAI_MDIV:
        case FSL_SAI_VERID:
        case FSL_SAI_PARAM:
        case FSL_SAI_TTCTN:
        case FSL_SAI_RTCTN:
        case FSL_SAI_TTCTL:
        case FSL_SAI_TBCTN:
        case FSL_SAI_TTCAP:
        case FSL_SAI_RTCTL:
        case FSL_SAI_RBCTN:
        case FSL_SAI_RTCAP:
                return true;
        default:
                return false;
        }
}

static bool fsl_sai_volatile_reg(struct device *dev, unsigned int reg)
{
        struct fsl_sai *sai = dev_get_drvdata(dev);
        unsigned int ofs = sai->soc_data->reg_offset;

        if (reg == FSL_SAI_TCSR(ofs) || reg == FSL_SAI_RCSR(ofs))
                return true;

        /* Set VERID and PARAM be volatile for reading value in probe */
        if (ofs == 8 && (reg == FSL_SAI_VERID || reg == FSL_SAI_PARAM))
                return true;

        switch (reg) {
        case FSL_SAI_TFR0:
        case FSL_SAI_TFR1:
        case FSL_SAI_TFR2:
        case FSL_SAI_TFR3:
        case FSL_SAI_TFR4:
        case FSL_SAI_TFR5:
        case FSL_SAI_TFR6:
        case FSL_SAI_TFR7:
        case FSL_SAI_RFR0:
        case FSL_SAI_RFR1:
        case FSL_SAI_RFR2:
        case FSL_SAI_RFR3:
        case FSL_SAI_RFR4:
        case FSL_SAI_RFR5:
        case FSL_SAI_RFR6:
        case FSL_SAI_RFR7:
        case FSL_SAI_RDR0:
        case FSL_SAI_RDR1:
        case FSL_SAI_RDR2:
        case FSL_SAI_RDR3:
        case FSL_SAI_RDR4:
        case FSL_SAI_RDR5:
        case FSL_SAI_RDR6:
        case FSL_SAI_RDR7:
                return true;
        default:
                return false;
        }
}

static bool fsl_sai_writeable_reg(struct device *dev, unsigned int reg)
{
        struct fsl_sai *sai = dev_get_drvdata(dev);
        unsigned int ofs = sai->soc_data->reg_offset;

        if (reg >= FSL_SAI_TCSR(ofs) && reg <= FSL_SAI_TCR5(ofs))
                return true;

        if (reg >= FSL_SAI_RCSR(ofs) && reg <= FSL_SAI_RCR5(ofs))
                return true;

        switch (reg) {
        case FSL_SAI_TDR0:
        case FSL_SAI_TDR1:
        case FSL_SAI_TDR2:
        case FSL_SAI_TDR3:
        case FSL_SAI_TDR4:
        case FSL_SAI_TDR5:
        case FSL_SAI_TDR6:
        case FSL_SAI_TDR7:
        case FSL_SAI_TMR:
        case FSL_SAI_RMR:
        case FSL_SAI_MCTL:
        case FSL_SAI_MDIV:
        case FSL_SAI_TTCTL:
        case FSL_SAI_RTCTL:
                return true;
        default:
                return false;
        }
}

static struct regmap_config fsl_sai_regmap_config = {
        .reg_bits = 32,
        .reg_stride = 4,
        .val_bits = 32,
        .fast_io = true,

        .max_register = FSL_SAI_RMR,
        .reg_defaults = fsl_sai_reg_defaults_ofs0,
        .num_reg_defaults = ARRAY_SIZE(fsl_sai_reg_defaults_ofs0),
        .readable_reg = fsl_sai_readable_reg,
        .volatile_reg = fsl_sai_volatile_reg,
        .writeable_reg = fsl_sai_writeable_reg,
        .cache_type = REGCACHE_FLAT,
};

static int fsl_sai_check_version(struct device *dev)
{
        struct fsl_sai *sai = dev_get_drvdata(dev);
        unsigned char ofs = sai->soc_data->reg_offset;
        unsigned int val;
        int ret;

        if (FSL_SAI_TCSR(ofs) == FSL_SAI_VERID)
                return 0;

        ret = regmap_read(sai->regmap, FSL_SAI_VERID, &val);
        if (ret < 0)
                return ret;

        dev_dbg(dev, "VERID: 0x%016X\n", val);

        sai->verid.major = (val & FSL_SAI_VERID_MAJOR_MASK) >>
                           FSL_SAI_VERID_MAJOR_SHIFT;
        sai->verid.minor = (val & FSL_SAI_VERID_MINOR_MASK) >>
                           FSL_SAI_VERID_MINOR_SHIFT;
        sai->verid.feature = val & FSL_SAI_VERID_FEATURE_MASK;

        ret = regmap_read(sai->regmap, FSL_SAI_PARAM, &val);
        if (ret < 0)
                return ret;

        dev_dbg(dev, "PARAM: 0x%016X\n", val);

        /* Max slots per frame, power of 2 */
        sai->param.slot_num = 1 <<
                ((val & FSL_SAI_PARAM_SPF_MASK) >> FSL_SAI_PARAM_SPF_SHIFT);

        /* Words per fifo, power of 2 */
        sai->param.fifo_depth = 1 <<
                ((val & FSL_SAI_PARAM_WPF_MASK) >> FSL_SAI_PARAM_WPF_SHIFT);

        /* Number of datalines implemented */
        sai->param.dataline = val & FSL_SAI_PARAM_DLN_MASK;

        return 0;
}

static int fsl_sai_runtime_suspend(struct device *dev);
static int fsl_sai_runtime_resume(struct device *dev);

static int fsl_sai_probe(struct platform_device *pdev)

{
        struct device_node *np = pdev->dev.of_node;
        struct fsl_sai *sai;
        struct regmap *gpr;
        struct resource *res;
        void __iomem *base;
        char tmp[8];
        int irq, ret, i;
        int index;

        sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
        if (!sai)
                return -ENOMEM;

        sai->pdev = pdev;
        sai->soc_data = of_device_get_match_data(&pdev->dev);

        sai->is_lsb_first = of_property_read_bool(np, "lsb-first");

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        base = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(base))
                return PTR_ERR(base);

        if (sai->soc_data->reg_offset == 8) {
                fsl_sai_regmap_config.reg_defaults = fsl_sai_reg_defaults_ofs8;
                fsl_sai_regmap_config.max_register = FSL_SAI_MDIV;
                fsl_sai_regmap_config.num_reg_defaults =
                        ARRAY_SIZE(fsl_sai_reg_defaults_ofs8);
        }

        sai->regmap = devm_regmap_init_mmio(&pdev->dev, base, &fsl_sai_regmap_config);
        if (IS_ERR(sai->regmap)) {
                dev_err(&pdev->dev, "regmap init failed\n");
                return PTR_ERR(sai->regmap);
        }

        sai->bus_clk = devm_clk_get(&pdev->dev, "bus");
        /* Compatible with old DTB cases */
        if (IS_ERR(sai->bus_clk) && PTR_ERR(sai->bus_clk) != -EPROBE_DEFER)
                sai->bus_clk = devm_clk_get(&pdev->dev, "sai");
        if (IS_ERR(sai->bus_clk)) {
                dev_err(&pdev->dev, "failed to get bus clock: %ld\n",
                                PTR_ERR(sai->bus_clk));
                /* -EPROBE_DEFER */
                return PTR_ERR(sai->bus_clk);
        }

        for (i = 1; i < FSL_SAI_MCLK_MAX; i++) {
                sprintf(tmp, "mclk%d", i);
                sai->mclk_clk[i] = devm_clk_get(&pdev->dev, tmp);
                if (IS_ERR(sai->mclk_clk[i])) {
                        dev_err(&pdev->dev, "failed to get mclk%d clock: %ld\n",
                                        i + 1, PTR_ERR(sai->mclk_clk[i]));
                        sai->mclk_clk[i] = NULL;
                }
        }

        if (sai->soc_data->mclk0_is_mclk1)
                sai->mclk_clk[0] = sai->mclk_clk[1];
        else
                sai->mclk_clk[0] = sai->bus_clk;

        irq = platform_get_irq(pdev, 0);
        if (irq < 0)
                return irq;

        ret = devm_request_irq(&pdev->dev, irq, fsl_sai_isr, IRQF_SHARED,
                               np->name, sai);
        if (ret) {
                dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
                return ret;
        }

        memcpy(&sai->cpu_dai_drv, &fsl_sai_dai_template,
               sizeof(fsl_sai_dai_template));

        /* Sync Tx with Rx as default by following old DT binding */
        sai->synchronous[RX] = true;
        sai->synchronous[TX] = false;
        sai->cpu_dai_drv.symmetric_rate = 1;
        sai->cpu_dai_drv.symmetric_channels = 1;
        sai->cpu_dai_drv.symmetric_sample_bits = 1;

        if (of_find_property(np, "fsl,sai-synchronous-rx", NULL) &&
            of_find_property(np, "fsl,sai-asynchronous", NULL)) {
                /* error out if both synchronous and asynchronous are present */
                dev_err(&pdev->dev, "invalid binding for synchronous mode\n");
                return -EINVAL;
        }

        if (of_find_property(np, "fsl,sai-synchronous-rx", NULL)) {
                /* Sync Rx with Tx */
                sai->synchronous[RX] = false;
                sai->synchronous[TX] = true;
        } else if (of_find_property(np, "fsl,sai-asynchronous", NULL)) {
                /* Discard all settings for asynchronous mode */
                sai->synchronous[RX] = false;
                sai->synchronous[TX] = false;
                sai->cpu_dai_drv.symmetric_rate = 0;
                sai->cpu_dai_drv.symmetric_channels = 0;
                sai->cpu_dai_drv.symmetric_sample_bits = 0;
        }

        if (of_find_property(np, "fsl,sai-mclk-direction-output", NULL) &&
            of_device_is_compatible(np, "fsl,imx6ul-sai")) {
                gpr = syscon_regmap_lookup_by_compatible("fsl,imx6ul-iomuxc-gpr");
                if (IS_ERR(gpr)) {
                        dev_err(&pdev->dev, "cannot find iomuxc registers\n");
                        return PTR_ERR(gpr);
                }

                index = of_alias_get_id(np, "sai");
                if (index < 0)
                        return index;

                regmap_update_bits(gpr, IOMUXC_GPR1, MCLK_DIR(index),
                                   MCLK_DIR(index));
        }

        sai->dma_params_rx.addr = res->start + FSL_SAI_RDR0;
        sai->dma_params_tx.addr = res->start + FSL_SAI_TDR0;
        sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;
        sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX;

        platform_set_drvdata(pdev, sai);
        pm_runtime_enable(&pdev->dev);
        if (!pm_runtime_enabled(&pdev->dev)) {
                ret = fsl_sai_runtime_resume(&pdev->dev);
                if (ret)
                        goto err_pm_disable;
        }

        ret = pm_runtime_get_sync(&pdev->dev);
        if (ret < 0) {
                pm_runtime_put_noidle(&pdev->dev);
                goto err_pm_get_sync;
        }

        /* Get sai version */
        ret = fsl_sai_check_version(&pdev->dev);
        if (ret < 0)
                dev_warn(&pdev->dev, "Error reading SAI version: %d\n", ret);

        /* Select MCLK direction */
        if (of_find_property(np, "fsl,sai-mclk-direction-output", NULL) &&
            sai->verid.major >= 3 && sai->verid.minor >= 1) {
                regmap_update_bits(sai->regmap, FSL_SAI_MCTL,
                                   FSL_SAI_MCTL_MCLK_EN, FSL_SAI_MCTL_MCLK_EN);
        }

        ret = pm_runtime_put_sync(&pdev->dev);
        if (ret < 0)
                goto err_pm_get_sync;

        ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
                                              &sai->cpu_dai_drv, 1);
        if (ret)
                goto err_pm_get_sync;

        if (sai->soc_data->use_imx_pcm) {
                ret = imx_pcm_dma_init(pdev, IMX_SAI_DMABUF_SIZE);
                if (ret)
                        goto err_pm_get_sync;
        } else {
                ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
                if (ret)
                        goto err_pm_get_sync;
        }

        return ret;

err_pm_get_sync:
        if (!pm_runtime_status_suspended(&pdev->dev))
                fsl_sai_runtime_suspend(&pdev->dev);
err_pm_disable:
        pm_runtime_disable(&pdev->dev);

        return ret;
}

static int fsl_sai_remove(struct platform_device *pdev)
{
        pm_runtime_disable(&pdev->dev);
        if (!pm_runtime_status_suspended(&pdev->dev))
                fsl_sai_runtime_suspend(&pdev->dev);

        return 0;
}

static const struct fsl_sai_soc_data fsl_sai_vf610_data = {
        .use_imx_pcm = false,
        .use_edma = false,
        .fifo_depth = 32,
        .reg_offset = 0,
        .mclk0_is_mclk1 = false,
        .flags = 0,
};

static const struct fsl_sai_soc_data fsl_sai_imx6sx_data = {
        .use_imx_pcm = true,
        .use_edma = false,
        .fifo_depth = 32,
        .reg_offset = 0,
        .mclk0_is_mclk1 = true,
        .flags = 0,
};

static const struct fsl_sai_soc_data fsl_sai_imx7ulp_data = {
        .use_imx_pcm = true,
        .use_edma = false,
        .fifo_depth = 16,
        .reg_offset = 8,
        .mclk0_is_mclk1 = false,
        .flags = PMQOS_CPU_LATENCY,
};

static const struct fsl_sai_soc_data fsl_sai_imx8mq_data = {
        .use_imx_pcm = true,
        .use_edma = false,
        .fifo_depth = 128,
        .reg_offset = 8,
        .mclk0_is_mclk1 = false,
        .flags = 0,
};

static const struct fsl_sai_soc_data fsl_sai_imx8qm_data = {
        .use_imx_pcm = true,
        .use_edma = true,
        .fifo_depth = 64,
        .reg_offset = 0,
        .mclk0_is_mclk1 = false,
        .flags = 0,
};

static const struct of_device_id fsl_sai_ids[] = {
        { .compatible = "fsl,vf610-sai", .data = &fsl_sai_vf610_data },
        { .compatible = "fsl,imx6sx-sai", .data = &fsl_sai_imx6sx_data },
        { .compatible = "fsl,imx6ul-sai", .data = &fsl_sai_imx6sx_data },
        { .compatible = "fsl,imx7ulp-sai", .data = &fsl_sai_imx7ulp_data },
        { .compatible = "fsl,imx8mq-sai", .data = &fsl_sai_imx8mq_data },
        { .compatible = "fsl,imx8qm-sai", .data = &fsl_sai_imx8qm_data },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, fsl_sai_ids);

static int fsl_sai_runtime_suspend(struct device *dev)
{
        struct fsl_sai *sai = dev_get_drvdata(dev);

        if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE))
                clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[0]]);

        if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_PLAYBACK))
                clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[1]]);

        clk_disable_unprepare(sai->bus_clk);

        if (sai->soc_data->flags & PMQOS_CPU_LATENCY)
                cpu_latency_qos_remove_request(&sai->pm_qos_req);

        regcache_cache_only(sai->regmap, true);

        return 0;
}

static int fsl_sai_runtime_resume(struct device *dev)
{
        struct fsl_sai *sai = dev_get_drvdata(dev);
        unsigned int ofs = sai->soc_data->reg_offset;
        int ret;

        ret = clk_prepare_enable(sai->bus_clk);
        if (ret) {
                dev_err(dev, "failed to enable bus clock: %d\n", ret);
                return ret;
        }

        if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_PLAYBACK)) {
                ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[1]]);
                if (ret)
                        goto disable_bus_clk;
        }

        if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE)) {
                ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[0]]);
                if (ret)
                        goto disable_tx_clk;
        }

        if (sai->soc_data->flags & PMQOS_CPU_LATENCY)
                cpu_latency_qos_add_request(&sai->pm_qos_req, 0);

        regcache_cache_only(sai->regmap, false);
        regcache_mark_dirty(sai->regmap);
        regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), FSL_SAI_CSR_SR);
        regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), FSL_SAI_CSR_SR);
        usleep_range(1000, 2000);
        regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), 0);
        regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), 0);

        ret = regcache_sync(sai->regmap);
        if (ret)
                goto disable_rx_clk;

        return 0;

disable_rx_clk:
        if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE))
                clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[0]]);
disable_tx_clk:
        if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_PLAYBACK))
                clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[1]]);
disable_bus_clk:
        clk_disable_unprepare(sai->bus_clk);

        return ret;
}

static const struct dev_pm_ops fsl_sai_pm_ops = {
        SET_RUNTIME_PM_OPS(fsl_sai_runtime_suspend,
                           fsl_sai_runtime_resume, NULL)
        SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
                                pm_runtime_force_resume)
};

static struct platform_driver fsl_sai_driver = {
        .probe = fsl_sai_probe,
        .remove = fsl_sai_remove,
        .driver = {
                .name = "fsl-sai",
                .pm = &fsl_sai_pm_ops,
                .of_match_table = fsl_sai_ids,
        },
};
module_platform_driver(fsl_sai_driver);

MODULE_DESCRIPTION("Freescale Soc SAI Interface");
MODULE_AUTHOR("Xiubo Li, <Li.Xiubo@freescale.com>");
MODULE_ALIAS("platform:fsl-sai");
MODULE_LICENSE("GPL");