// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2014-2015 Broadcom Corporation
#include <linux/debugfs.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>

#include "cygnus-ssp.h"

/* Register offset needed for ASoC PCM module */

#define INTH_R5F_STATUS_OFFSET     0x040
#define INTH_R5F_CLEAR_OFFSET      0x048
#define INTH_R5F_MASK_SET_OFFSET   0x050
#define INTH_R5F_MASK_CLEAR_OFFSET 0x054

#define BF_REARM_FREE_MARK_OFFSET 0x344
#define BF_REARM_FULL_MARK_OFFSET 0x348

/* Ring Buffer Ctrl Regs --- Start */
/* AUD_FMM_BF_CTRL_SOURCECH_RINGBUF_X_RDADDR_REG_BASE */
#define SRC_RBUF_0_RDADDR_OFFSET 0x500
#define SRC_RBUF_1_RDADDR_OFFSET 0x518
#define SRC_RBUF_2_RDADDR_OFFSET 0x530
#define SRC_RBUF_3_RDADDR_OFFSET 0x548
#define SRC_RBUF_4_RDADDR_OFFSET 0x560
#define SRC_RBUF_5_RDADDR_OFFSET 0x578
#define SRC_RBUF_6_RDADDR_OFFSET 0x590

/* AUD_FMM_BF_CTRL_SOURCECH_RINGBUF_X_WRADDR_REG_BASE */
#define SRC_RBUF_0_WRADDR_OFFSET 0x504
#define SRC_RBUF_1_WRADDR_OFFSET 0x51c
#define SRC_RBUF_2_WRADDR_OFFSET 0x534
#define SRC_RBUF_3_WRADDR_OFFSET 0x54c
#define SRC_RBUF_4_WRADDR_OFFSET 0x564
#define SRC_RBUF_5_WRADDR_OFFSET 0x57c
#define SRC_RBUF_6_WRADDR_OFFSET 0x594

/* AUD_FMM_BF_CTRL_SOURCECH_RINGBUF_X_BASEADDR_REG_BASE */
#define SRC_RBUF_0_BASEADDR_OFFSET 0x508
#define SRC_RBUF_1_BASEADDR_OFFSET 0x520
#define SRC_RBUF_2_BASEADDR_OFFSET 0x538
#define SRC_RBUF_3_BASEADDR_OFFSET 0x550
#define SRC_RBUF_4_BASEADDR_OFFSET 0x568
#define SRC_RBUF_5_BASEADDR_OFFSET 0x580
#define SRC_RBUF_6_BASEADDR_OFFSET 0x598

/* AUD_FMM_BF_CTRL_SOURCECH_RINGBUF_X_ENDADDR_REG_BASE */
#define SRC_RBUF_0_ENDADDR_OFFSET 0x50c
#define SRC_RBUF_1_ENDADDR_OFFSET 0x524
#define SRC_RBUF_2_ENDADDR_OFFSET 0x53c
#define SRC_RBUF_3_ENDADDR_OFFSET 0x554
#define SRC_RBUF_4_ENDADDR_OFFSET 0x56c
#define SRC_RBUF_5_ENDADDR_OFFSET 0x584
#define SRC_RBUF_6_ENDADDR_OFFSET 0x59c

/* AUD_FMM_BF_CTRL_SOURCECH_RINGBUF_X_FREE_MARK_REG_BASE */
#define SRC_RBUF_0_FREE_MARK_OFFSET 0x510
#define SRC_RBUF_1_FREE_MARK_OFFSET 0x528
#define SRC_RBUF_2_FREE_MARK_OFFSET 0x540
#define SRC_RBUF_3_FREE_MARK_OFFSET 0x558
#define SRC_RBUF_4_FREE_MARK_OFFSET 0x570
#define SRC_RBUF_5_FREE_MARK_OFFSET 0x588
#define SRC_RBUF_6_FREE_MARK_OFFSET 0x5a0

/* AUD_FMM_BF_CTRL_DESTCH_RINGBUF_X_RDADDR_REG_BASE */
#define DST_RBUF_0_RDADDR_OFFSET 0x5c0
#define DST_RBUF_1_RDADDR_OFFSET 0x5d8
#define DST_RBUF_2_RDADDR_OFFSET 0x5f0
#define DST_RBUF_3_RDADDR_OFFSET 0x608
#define DST_RBUF_4_RDADDR_OFFSET 0x620
#define DST_RBUF_5_RDADDR_OFFSET 0x638

/* AUD_FMM_BF_CTRL_DESTCH_RINGBUF_X_WRADDR_REG_BASE */
#define DST_RBUF_0_WRADDR_OFFSET 0x5c4
#define DST_RBUF_1_WRADDR_OFFSET 0x5dc
#define DST_RBUF_2_WRADDR_OFFSET 0x5f4
#define DST_RBUF_3_WRADDR_OFFSET 0x60c
#define DST_RBUF_4_WRADDR_OFFSET 0x624
#define DST_RBUF_5_WRADDR_OFFSET 0x63c

/* AUD_FMM_BF_CTRL_DESTCH_RINGBUF_X_BASEADDR_REG_BASE */
#define DST_RBUF_0_BASEADDR_OFFSET 0x5c8
#define DST_RBUF_1_BASEADDR_OFFSET 0x5e0
#define DST_RBUF_2_BASEADDR_OFFSET 0x5f8
#define DST_RBUF_3_BASEADDR_OFFSET 0x610
#define DST_RBUF_4_BASEADDR_OFFSET 0x628
#define DST_RBUF_5_BASEADDR_OFFSET 0x640

/* AUD_FMM_BF_CTRL_DESTCH_RINGBUF_X_ENDADDR_REG_BASE */
#define DST_RBUF_0_ENDADDR_OFFSET 0x5cc
#define DST_RBUF_1_ENDADDR_OFFSET 0x5e4
#define DST_RBUF_2_ENDADDR_OFFSET 0x5fc
#define DST_RBUF_3_ENDADDR_OFFSET 0x614
#define DST_RBUF_4_ENDADDR_OFFSET 0x62c
#define DST_RBUF_5_ENDADDR_OFFSET 0x644

/* AUD_FMM_BF_CTRL_DESTCH_RINGBUF_X_FULL_MARK_REG_BASE */
#define DST_RBUF_0_FULL_MARK_OFFSET 0x5d0
#define DST_RBUF_1_FULL_MARK_OFFSET 0x5e8
#define DST_RBUF_2_FULL_MARK_OFFSET 0x600
#define DST_RBUF_3_FULL_MARK_OFFSET 0x618
#define DST_RBUF_4_FULL_MARK_OFFSET 0x630
#define DST_RBUF_5_FULL_MARK_OFFSET 0x648
/* Ring Buffer Ctrl Regs --- End */

/* Error Status Regs --- Start */
/* AUD_FMM_BF_ESR_ESRX_STATUS_REG_BASE */
#define ESR0_STATUS_OFFSET 0x900
#define ESR1_STATUS_OFFSET 0x918
#define ESR2_STATUS_OFFSET 0x930
#define ESR3_STATUS_OFFSET 0x948
#define ESR4_STATUS_OFFSET 0x960

/* AUD_FMM_BF_ESR_ESRX_STATUS_CLEAR_REG_BASE */
#define ESR0_STATUS_CLR_OFFSET 0x908
#define ESR1_STATUS_CLR_OFFSET 0x920
#define ESR2_STATUS_CLR_OFFSET 0x938
#define ESR3_STATUS_CLR_OFFSET 0x950
#define ESR4_STATUS_CLR_OFFSET 0x968

/* AUD_FMM_BF_ESR_ESRX_MASK_REG_BASE */
#define ESR0_MASK_STATUS_OFFSET 0x90c
#define ESR1_MASK_STATUS_OFFSET 0x924
#define ESR2_MASK_STATUS_OFFSET 0x93c
#define ESR3_MASK_STATUS_OFFSET 0x954
#define ESR4_MASK_STATUS_OFFSET 0x96c

/* AUD_FMM_BF_ESR_ESRX_MASK_SET_REG_BASE */
#define ESR0_MASK_SET_OFFSET 0x910
#define ESR1_MASK_SET_OFFSET 0x928
#define ESR2_MASK_SET_OFFSET 0x940
#define ESR3_MASK_SET_OFFSET 0x958
#define ESR4_MASK_SET_OFFSET 0x970

/* AUD_FMM_BF_ESR_ESRX_MASK_CLEAR_REG_BASE */
#define ESR0_MASK_CLR_OFFSET 0x914
#define ESR1_MASK_CLR_OFFSET 0x92c
#define ESR2_MASK_CLR_OFFSET 0x944
#define ESR3_MASK_CLR_OFFSET 0x95c
#define ESR4_MASK_CLR_OFFSET 0x974
/* Error Status Regs --- End */

#define R5F_ESR0_SHIFT  0    /* esr0 = fifo underflow */
#define R5F_ESR1_SHIFT  1    /* esr1 = ringbuf underflow */
#define R5F_ESR2_SHIFT  2    /* esr2 = ringbuf overflow */
#define R5F_ESR3_SHIFT  3    /* esr3 = freemark */
#define R5F_ESR4_SHIFT  4    /* esr4 = fullmark */


/* Mask for R5F register.  Set all relevant interrupt for playback handler */
#define ANY_PLAYBACK_IRQ  (BIT(R5F_ESR0_SHIFT) | \
                           BIT(R5F_ESR1_SHIFT) | \
                           BIT(R5F_ESR3_SHIFT))

/* Mask for R5F register.  Set all relevant interrupt for capture handler */
#define ANY_CAPTURE_IRQ   (BIT(R5F_ESR2_SHIFT) | BIT(R5F_ESR4_SHIFT))

/*
 * PERIOD_BYTES_MIN is the number of bytes to at which the interrupt will tick.
 * This number should be a multiple of 256. Minimum value is 256
 */
#define PERIOD_BYTES_MIN 0x100

static const struct snd_pcm_hardware cygnus_pcm_hw = {
        .info = SNDRV_PCM_INFO_MMAP |
                        SNDRV_PCM_INFO_MMAP_VALID |
                        SNDRV_PCM_INFO_INTERLEAVED,
        .formats = SNDRV_PCM_FMTBIT_S16_LE |
                        SNDRV_PCM_FMTBIT_S32_LE,

        /* A period is basically an interrupt */
        .period_bytes_min = PERIOD_BYTES_MIN,
        .period_bytes_max = 0x10000,

        /* period_min/max gives range of approx interrupts per buffer */
        .periods_min = 2,
        .periods_max = 8,

        /*
         * maximum buffer size in bytes = period_bytes_max * periods_max
         * We allocate this amount of data for each enabled channel
         */
        .buffer_bytes_max = 4 * 0x8000,
};

static u64 cygnus_dma_dmamask = DMA_BIT_MASK(32);

static struct cygnus_aio_port *cygnus_dai_get_dma_data(
                                struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(substream);

        return snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(soc_runtime, 0), substream);
}

static void ringbuf_set_initial(void __iomem *audio_io,
                struct ringbuf_regs *p_rbuf,
                bool is_playback,
                u32 start,
                u32 periodsize,
                u32 bufsize)
{
        u32 initial_rd;
        u32 initial_wr;
        u32 end;
        u32 fmark_val; /* free or full mark */

        p_rbuf->period_bytes = periodsize;
        p_rbuf->buf_size = bufsize;

        if (is_playback) {
                /* Set the pointers to indicate full (flip uppermost bit) */
                initial_rd = start;
                initial_wr = initial_rd ^ BIT(31);
        } else {
                /* Set the pointers to indicate empty */
                initial_wr = start;
                initial_rd = initial_wr;
        }

        end = start + bufsize - 1;

        /*
         * The interrupt will fire when free/full mark is *exceeded*
         * The fmark value must be multiple of PERIOD_BYTES_MIN so set fmark
         * to be PERIOD_BYTES_MIN less than the period size.
         */
        fmark_val = periodsize - PERIOD_BYTES_MIN;

        writel(start, audio_io + p_rbuf->baseaddr);
        writel(end, audio_io + p_rbuf->endaddr);
        writel(fmark_val, audio_io + p_rbuf->fmark);
        writel(initial_rd, audio_io + p_rbuf->rdaddr);
        writel(initial_wr, audio_io + p_rbuf->wraddr);
}

static int configure_ringbuf_regs(struct snd_pcm_substream *substream)
{
        struct cygnus_aio_port *aio;
        struct ringbuf_regs *p_rbuf;
        int status = 0;

        aio = cygnus_dai_get_dma_data(substream);

        /* Map the ssp portnum to a set of ring buffers. */
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                p_rbuf = &aio->play_rb_regs;

                switch (aio->portnum) {
                case 0:
                        *p_rbuf = RINGBUF_REG_PLAYBACK(0);
                        break;
                case 1:
                        *p_rbuf = RINGBUF_REG_PLAYBACK(2);
                        break;
                case 2:
                        *p_rbuf = RINGBUF_REG_PLAYBACK(4);
                        break;
                case 3: /* SPDIF */
                        *p_rbuf = RINGBUF_REG_PLAYBACK(6);
                        break;
                default:
                        status = -EINVAL;
                }
        } else {
                p_rbuf = &aio->capture_rb_regs;

                switch (aio->portnum) {
                case 0:
                        *p_rbuf = RINGBUF_REG_CAPTURE(0);
                        break;
                case 1:
                        *p_rbuf = RINGBUF_REG_CAPTURE(2);
                        break;
                case 2:
                        *p_rbuf = RINGBUF_REG_CAPTURE(4);
                        break;
                default:
                        status = -EINVAL;
                }
        }

        return status;
}

static struct ringbuf_regs *get_ringbuf(struct snd_pcm_substream *substream)
{
        struct cygnus_aio_port *aio;
        struct ringbuf_regs *p_rbuf = NULL;

        aio = cygnus_dai_get_dma_data(substream);

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                p_rbuf = &aio->play_rb_regs;
        else
                p_rbuf = &aio->capture_rb_regs;

        return p_rbuf;
}

static void enable_intr(struct snd_pcm_substream *substream)
{
        struct cygnus_aio_port *aio;
        u32 clear_mask;

        aio = cygnus_dai_get_dma_data(substream);

        /* The port number maps to the bit position to be cleared */
        clear_mask = BIT(aio->portnum);

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                /* Clear interrupt status before enabling them */
                writel(clear_mask, aio->cygaud->audio + ESR0_STATUS_CLR_OFFSET);
                writel(clear_mask, aio->cygaud->audio + ESR1_STATUS_CLR_OFFSET);
                writel(clear_mask, aio->cygaud->audio + ESR3_STATUS_CLR_OFFSET);
                /* Unmask the interrupts of the given port*/
                writel(clear_mask, aio->cygaud->audio + ESR0_MASK_CLR_OFFSET);
                writel(clear_mask, aio->cygaud->audio + ESR1_MASK_CLR_OFFSET);
                writel(clear_mask, aio->cygaud->audio + ESR3_MASK_CLR_OFFSET);

                writel(ANY_PLAYBACK_IRQ,
                        aio->cygaud->audio + INTH_R5F_MASK_CLEAR_OFFSET);
        } else {
                writel(clear_mask, aio->cygaud->audio + ESR2_STATUS_CLR_OFFSET);
                writel(clear_mask, aio->cygaud->audio + ESR4_STATUS_CLR_OFFSET);
                writel(clear_mask, aio->cygaud->audio + ESR2_MASK_CLR_OFFSET);
                writel(clear_mask, aio->cygaud->audio + ESR4_MASK_CLR_OFFSET);

                writel(ANY_CAPTURE_IRQ,
                        aio->cygaud->audio + INTH_R5F_MASK_CLEAR_OFFSET);
        }

}

static void disable_intr(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
        struct cygnus_aio_port *aio;
        u32 set_mask;

        aio = cygnus_dai_get_dma_data(substream);

        dev_dbg(snd_soc_rtd_to_cpu(rtd, 0)->dev, "%s on port %d\n", __func__, aio->portnum);

        /* The port number maps to the bit position to be set */
        set_mask = BIT(aio->portnum);

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                /* Mask the interrupts of the given port*/
                writel(set_mask, aio->cygaud->audio + ESR0_MASK_SET_OFFSET);
                writel(set_mask, aio->cygaud->audio + ESR1_MASK_SET_OFFSET);
                writel(set_mask, aio->cygaud->audio + ESR3_MASK_SET_OFFSET);
        } else {
                writel(set_mask, aio->cygaud->audio + ESR2_MASK_SET_OFFSET);
                writel(set_mask, aio->cygaud->audio + ESR4_MASK_SET_OFFSET);
        }

}

static int cygnus_pcm_trigger(struct snd_soc_component *component,
                              struct snd_pcm_substream *substream, int cmd)
{
        int ret = 0;

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_RESUME:
                enable_intr(substream);
                break;

        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_SUSPEND:
                disable_intr(substream);
                break;
        default:
                ret = -EINVAL;
        }

        return ret;
}

static void cygnus_pcm_period_elapsed(struct snd_pcm_substream *substream)
{
        struct cygnus_aio_port *aio;
        struct ringbuf_regs *p_rbuf = NULL;
        u32 regval;

        aio = cygnus_dai_get_dma_data(substream);

        p_rbuf = get_ringbuf(substream);

        /*
         * If free/full mark interrupt occurs, provide timestamp
         * to ALSA and update appropriate idx by period_bytes
         */
        snd_pcm_period_elapsed(substream);

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                /* Set the ring buffer to full */
                regval = readl(aio->cygaud->audio + p_rbuf->rdaddr);
                regval = regval ^ BIT(31);
                writel(regval, aio->cygaud->audio + p_rbuf->wraddr);
        } else {
                /* Set the ring buffer to empty */
                regval = readl(aio->cygaud->audio + p_rbuf->wraddr);
                writel(regval, aio->cygaud->audio + p_rbuf->rdaddr);
        }
}

/*
 * ESR0/1/3 status  Description
 *  0x1 I2S0_out port caused interrupt
 *  0x2 I2S1_out port caused interrupt
 *  0x4 I2S2_out port caused interrupt
 *  0x8 SPDIF_out port caused interrupt
 */
static void handle_playback_irq(struct cygnus_audio *cygaud)
{
        void __iomem *audio_io;
        u32 port;
        u32 esr_status0, esr_status1, esr_status3;

        audio_io = cygaud->audio;

        /*
         * ESR status gets updates with/without interrupts enabled.
         * So, check the ESR mask, which provides interrupt enable/
         * disable status and use it to determine which ESR status
         * should be serviced.
         */
        esr_status0 = readl(audio_io + ESR0_STATUS_OFFSET);
        esr_status0 &= ~readl(audio_io + ESR0_MASK_STATUS_OFFSET);
        esr_status1 = readl(audio_io + ESR1_STATUS_OFFSET);
        esr_status1 &= ~readl(audio_io + ESR1_MASK_STATUS_OFFSET);
        esr_status3 = readl(audio_io + ESR3_STATUS_OFFSET);
        esr_status3 &= ~readl(audio_io + ESR3_MASK_STATUS_OFFSET);

        for (port = 0; port < CYGNUS_MAX_PLAYBACK_PORTS; port++) {
                u32 esrmask = BIT(port);

                /*
                 * Ringbuffer or FIFO underflow
                 * If we get this interrupt then, it is also true that we have
                 * not yet responded to the freemark interrupt.
                 * Log a debug message.  The freemark handler below will
                 * handle getting everything going again.
                 */
                if ((esrmask & esr_status1) || (esrmask & esr_status0)) {
                        dev_dbg(cygaud->dev,
                                "Underrun: esr0=0x%x, esr1=0x%x esr3=0x%x\n",
                                esr_status0, esr_status1, esr_status3);
                }

                /*
                 * Freemark is hit. This is the normal interrupt.
                 * In typical operation the read and write regs will be equal
                 */
                if (esrmask & esr_status3) {
                        struct snd_pcm_substream *playstr;

                        playstr = cygaud->portinfo[port].play_stream;
                        cygnus_pcm_period_elapsed(playstr);
                }
        }

        /* Clear ESR interrupt */
        writel(esr_status0, audio_io + ESR0_STATUS_CLR_OFFSET);
        writel(esr_status1, audio_io + ESR1_STATUS_CLR_OFFSET);
        writel(esr_status3, audio_io + ESR3_STATUS_CLR_OFFSET);
        /* Rearm freemark logic by writing 1 to the correct bit */
        writel(esr_status3, audio_io + BF_REARM_FREE_MARK_OFFSET);
}

/*
 * ESR2/4 status  Description
 *  0x1 I2S0_in port caused interrupt
 *  0x2 I2S1_in port caused interrupt
 *  0x4 I2S2_in port caused interrupt
 */
static void handle_capture_irq(struct cygnus_audio *cygaud)
{
        void __iomem *audio_io;
        u32 port;
        u32 esr_status2, esr_status4;

        audio_io = cygaud->audio;

        /*
         * ESR status gets updates with/without interrupts enabled.
         * So, check the ESR mask, which provides interrupt enable/
         * disable status and use it to determine which ESR status
         * should be serviced.
         */
        esr_status2 = readl(audio_io + ESR2_STATUS_OFFSET);
        esr_status2 &= ~readl(audio_io + ESR2_MASK_STATUS_OFFSET);
        esr_status4 = readl(audio_io + ESR4_STATUS_OFFSET);
        esr_status4 &= ~readl(audio_io + ESR4_MASK_STATUS_OFFSET);

        for (port = 0; port < CYGNUS_MAX_CAPTURE_PORTS; port++) {
                u32 esrmask = BIT(port);

                /*
                 * Ringbuffer or FIFO overflow
                 * If we get this interrupt then, it is also true that we have
                 * not yet responded to the fullmark interrupt.
                 * Log a debug message.  The fullmark handler below will
                 * handle getting everything going again.
                 */
                if (esrmask & esr_status2)
                        dev_dbg(cygaud->dev,
                                "Overflow: esr2=0x%x\n", esr_status2);

                if (esrmask & esr_status4) {
                        struct snd_pcm_substream *capstr;

                        capstr = cygaud->portinfo[port].capture_stream;
                        cygnus_pcm_period_elapsed(capstr);
                }
        }

        writel(esr_status2, audio_io + ESR2_STATUS_CLR_OFFSET);
        writel(esr_status4, audio_io + ESR4_STATUS_CLR_OFFSET);
        /* Rearm fullmark logic by writing 1 to the correct bit */
        writel(esr_status4, audio_io + BF_REARM_FULL_MARK_OFFSET);
}

static irqreturn_t cygnus_dma_irq(int irq, void *data)
{
        u32 r5_status;
        struct cygnus_audio *cygaud = data;

        /*
         * R5 status bits       Description
         *  0           ESR0 (playback FIFO interrupt)
         *  1           ESR1 (playback rbuf interrupt)
         *  2           ESR2 (capture rbuf interrupt)
         *  3           ESR3 (Freemark play. interrupt)
         *  4           ESR4 (Fullmark capt. interrupt)
         */
        r5_status = readl(cygaud->audio + INTH_R5F_STATUS_OFFSET);

        if (!(r5_status & (ANY_PLAYBACK_IRQ | ANY_CAPTURE_IRQ)))
                return IRQ_NONE;

        /* If playback interrupt happened */
        if (ANY_PLAYBACK_IRQ & r5_status) {
                handle_playback_irq(cygaud);
                writel(ANY_PLAYBACK_IRQ & r5_status,
                        cygaud->audio + INTH_R5F_CLEAR_OFFSET);
        }

        /* If  capture interrupt happened */
        if (ANY_CAPTURE_IRQ & r5_status) {
                handle_capture_irq(cygaud);
                writel(ANY_CAPTURE_IRQ & r5_status,
                        cygaud->audio + INTH_R5F_CLEAR_OFFSET);
        }

        return IRQ_HANDLED;
}

static int cygnus_pcm_open(struct snd_soc_component *component,
                           struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct cygnus_aio_port *aio;
        int ret;

        aio = cygnus_dai_get_dma_data(substream);
        if (!aio)
                return -ENODEV;

        dev_dbg(snd_soc_rtd_to_cpu(rtd, 0)->dev, "%s port %d\n", __func__, aio->portnum);

        snd_soc_set_runtime_hwparams(substream, &cygnus_pcm_hw);

        ret = snd_pcm_hw_constraint_step(runtime, 0,
                SNDRV_PCM_HW_PARAM_PERIOD_BYTES, PERIOD_BYTES_MIN);
        if (ret < 0)
                return ret;

        ret = snd_pcm_hw_constraint_step(runtime, 0,
                SNDRV_PCM_HW_PARAM_BUFFER_BYTES, PERIOD_BYTES_MIN);
        if (ret < 0)
                return ret;
        /*
         * Keep track of which substream belongs to which port.
         * This info is needed by snd_pcm_period_elapsed() in irq_handler
         */
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                aio->play_stream = substream;
        else
                aio->capture_stream = substream;

        return 0;
}

static int cygnus_pcm_close(struct snd_soc_component *component,
                            struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
        struct cygnus_aio_port *aio;

        aio = cygnus_dai_get_dma_data(substream);

        dev_dbg(snd_soc_rtd_to_cpu(rtd, 0)->dev, "%s  port %d\n", __func__, aio->portnum);

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                aio->play_stream = NULL;
        else
                aio->capture_stream = NULL;

        if (!aio->play_stream && !aio->capture_stream)
                dev_dbg(snd_soc_rtd_to_cpu(rtd, 0)->dev, "freed  port %d\n", aio->portnum);

        return 0;
}

static int cygnus_pcm_prepare(struct snd_soc_component *component,
                              struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct cygnus_aio_port *aio;
        unsigned long bufsize, periodsize;
        bool is_play;
        u32 start;
        struct ringbuf_regs *p_rbuf = NULL;

        aio = cygnus_dai_get_dma_data(substream);
        dev_dbg(snd_soc_rtd_to_cpu(rtd, 0)->dev, "%s port %d\n", __func__, aio->portnum);

        bufsize = snd_pcm_lib_buffer_bytes(substream);
        periodsize = snd_pcm_lib_period_bytes(substream);

        dev_dbg(snd_soc_rtd_to_cpu(rtd, 0)->dev, "%s (buf_size %lu) (period_size %lu)\n",
                        __func__, bufsize, periodsize);

        configure_ringbuf_regs(substream);

        p_rbuf = get_ringbuf(substream);

        start = runtime->dma_addr;

        is_play = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 1 : 0;

        ringbuf_set_initial(aio->cygaud->audio, p_rbuf, is_play, start,
                                periodsize, bufsize);

        return 0;
}

static snd_pcm_uframes_t cygnus_pcm_pointer(struct snd_soc_component *component,
                                            struct snd_pcm_substream *substream)
{
        struct cygnus_aio_port *aio;
        unsigned int res = 0, cur = 0, base = 0;
        struct ringbuf_regs *p_rbuf = NULL;

        aio = cygnus_dai_get_dma_data(substream);

        /*
         * Get the offset of the current read (for playack) or write
         * index (for capture).  Report this value back to the asoc framework.
         */
        p_rbuf = get_ringbuf(substream);
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                cur = readl(aio->cygaud->audio + p_rbuf->rdaddr);
        else
                cur = readl(aio->cygaud->audio + p_rbuf->wraddr);

        base = readl(aio->cygaud->audio + p_rbuf->baseaddr);

        /*
         * Mask off the MSB of the rdaddr,wraddr and baseaddr
         * since MSB is not part of the address
         */
        res = (cur & 0x7fffffff) - (base & 0x7fffffff);

        return bytes_to_frames(substream->runtime, res);
}

static int cygnus_dma_new(struct snd_soc_component *component,
                          struct snd_soc_pcm_runtime *rtd)
{
        size_t size = cygnus_pcm_hw.buffer_bytes_max;
        struct snd_card *card = rtd->card->snd_card;

        if (!card->dev->dma_mask)
                card->dev->dma_mask = &cygnus_dma_dmamask;
        if (!card->dev->coherent_dma_mask)
                card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

        snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
                                       card->dev, size, size);

        return 0;
}

static const struct snd_soc_component_driver cygnus_soc_platform = {
        .open           = cygnus_pcm_open,
        .close          = cygnus_pcm_close,
        .prepare        = cygnus_pcm_prepare,
        .trigger        = cygnus_pcm_trigger,
        .pointer        = cygnus_pcm_pointer,
        .pcm_construct  = cygnus_dma_new,
};

int cygnus_soc_platform_register(struct device *dev,
                                 struct cygnus_audio *cygaud)
{
        int rc;

        dev_dbg(dev, "%s Enter\n", __func__);

        rc = devm_request_irq(dev, cygaud->irq_num, cygnus_dma_irq,
                                IRQF_SHARED, "cygnus-audio", cygaud);
        if (rc) {
                dev_err(dev, "%s request_irq error %d\n", __func__, rc);
                return rc;
        }

        rc = devm_snd_soc_register_component(dev, &cygnus_soc_platform,
                                             NULL, 0);
        if (rc) {
                dev_err(dev, "%s failed\n", __func__);
                return rc;
        }

        return 0;
}

int cygnus_soc_platform_unregister(struct device *dev)
{
        return 0;
}

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Broadcom");
MODULE_DESCRIPTION("Cygnus ASoC PCM module");