/*-
 * Copyright (c) 2012 Ruslan Bukin <br@bsdpad.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * RME HDSPe driver for FreeBSD (pcm-part).
 * Supported cards: AIO, RayDAT.
 */

#include <dev/sound/pcm/sound.h>
#include <dev/sound/pci/hdspe.h>
#include <dev/sound/chip.h>

#include <bus/pci/pcireg.h>
#include <bus/pci/pcivar.h>

#include <mixer_if.h>

SND_DECLARE_FILE("$FreeBSD: head/sys/dev/sound/pci/hdspe-pcm.c 241066 2012-09-30 09:21:10Z kevlo $");

struct hdspe_latency {
        uint32_t n;
        uint32_t period;
        float ms;
};

static struct hdspe_latency latency_map[] = {
        { 7,   32, 0.7 },
        { 0,   64, 1.5 },
        { 1,  128,   3 },
        { 2,  256,   6 },
        { 3,  512,  12 },
        { 4, 1024,  23 },
        { 5, 2048,  46 },
        { 6, 4096,  93 },

        { 0,    0,   0 },
};

struct hdspe_rate {
        uint32_t speed;
        uint32_t reg;
};

static struct hdspe_rate rate_map[] = {
        {  32000, (HDSPE_FREQ_32000) },
        {  44100, (HDSPE_FREQ_44100) },
        {  48000, (HDSPE_FREQ_48000) },
        {  64000, (HDSPE_FREQ_32000 | HDSPE_FREQ_DOUBLE) },
        {  88200, (HDSPE_FREQ_44100 | HDSPE_FREQ_DOUBLE) },
        {  96000, (HDSPE_FREQ_48000 | HDSPE_FREQ_DOUBLE) },
        { 128000, (HDSPE_FREQ_32000 | HDSPE_FREQ_QUAD)   },
        { 176400, (HDSPE_FREQ_44100 | HDSPE_FREQ_QUAD)   },
        { 192000, (HDSPE_FREQ_48000 | HDSPE_FREQ_QUAD)   },

        { 0, 0 },
};


static int
hdspe_hw_mixer(struct sc_chinfo *ch, unsigned int dst,
    unsigned int src, unsigned short data)
{
        struct sc_pcminfo *scp = ch->parent;
        struct sc_info *sc = scp->sc;
        int offs = 0;

        if (ch->dir == PCMDIR_PLAY)
                offs = 64;

        hdspe_write_4(sc, HDSPE_MIXER_BASE +
            ((offs + src + 128 * dst) * sizeof(uint32_t)),
            data & 0xFFFF);

        return 0;
}

static int
hdspechan_setgain(struct sc_chinfo *ch)
{

        hdspe_hw_mixer(ch, ch->lslot, ch->lslot,
            ch->lvol * HDSPE_MAX_GAIN / 100);
        hdspe_hw_mixer(ch, ch->rslot, ch->rslot,
            ch->rvol * HDSPE_MAX_GAIN / 100);

        return 0;
}

static int
hdspemixer_init(struct snd_mixer *m)
{
        struct sc_pcminfo *scp = mix_getdevinfo(m);
        struct sc_info *sc = scp->sc;
        int mask;

        if (sc == NULL)
                return -1;

        mask = SOUND_MASK_PCM;

        if (scp->hc->play)
                mask |= SOUND_MASK_VOLUME;

        if (scp->hc->rec)
                mask |= SOUND_MASK_RECLEV;

        snd_mtxlock(sc->lock);
        pcm_setflags(scp->dev, pcm_getflags(scp->dev) | SD_F_SOFTPCMVOL);
        mix_setdevs(m, mask);
        snd_mtxunlock(sc->lock);

        return 0;
}

static int
hdspemixer_set(struct snd_mixer *m, unsigned dev,
    unsigned left, unsigned right)
{
        struct sc_pcminfo *scp = mix_getdevinfo(m);
        struct sc_chinfo *ch;
        int i;

#if 0
        device_printf(scp->dev, "hdspemixer_set() %d %d\n",
            left,right);
#endif

        for (i = 0; i < scp->chnum; i++) {
                ch = &scp->chan[i];
                if ((dev == SOUND_MIXER_VOLUME && ch->dir == PCMDIR_PLAY) ||
                    (dev == SOUND_MIXER_RECLEV && ch->dir == PCMDIR_REC)) {
                        ch->lvol = left;
                        ch->rvol = right;
                        if (ch->run)
                                hdspechan_setgain(ch);
                }
        }

        return 0;
}

static kobj_method_t hdspemixer_methods[] = {
        KOBJMETHOD(mixer_init,      hdspemixer_init),
        KOBJMETHOD(mixer_set,       hdspemixer_set),
        KOBJMETHOD_END
};
MIXER_DECLARE(hdspemixer);

static void
hdspechan_enable(struct sc_chinfo *ch, int value)
{
        struct sc_pcminfo *scp = ch->parent;
        struct sc_info *sc = scp->sc;
        int reg;

        if (ch->dir == PCMDIR_PLAY)
                reg = HDSPE_OUT_ENABLE_BASE;
        else
                reg = HDSPE_IN_ENABLE_BASE;

        ch->run = value;

        hdspe_write_1(sc, reg + (4 * ch->lslot), value);
        hdspe_write_1(sc, reg + (4 * ch->rslot), value);
}

static int
hdspe_running(struct sc_info *sc)
{
        struct sc_pcminfo *scp;
        struct sc_chinfo *ch;
        int i, j, devcount, err;
        device_t *devlist;

        if ((err = device_get_children(sc->dev, &devlist, &devcount)) != 0)
                goto bad;

        for (i = 0; i < devcount; i++) {
                scp = device_get_ivars(devlist[i]);
                for (j = 0; j < scp->chnum; j++) {
                        ch = &scp->chan[j];
                        if (ch->run)
                                goto bad;
                }
        }

        kfree(devlist, M_TEMP);
        return 0;
bad:

#if 0
        device_printf(sc->dev,"hdspe is running\n");
#endif

        kfree(devlist, M_TEMP);
        return 1;
}

static void
hdspe_start_audio(struct sc_info *sc)
{

        sc->ctrl_register |= (HDSPE_AUDIO_INT_ENABLE | HDSPE_ENABLE);
        hdspe_write_4(sc, HDSPE_CONTROL_REG, sc->ctrl_register);
}

static void
hdspe_stop_audio(struct sc_info *sc)
{

        if (hdspe_running(sc) == 1)
                return;

        sc->ctrl_register &= ~(HDSPE_AUDIO_INT_ENABLE | HDSPE_ENABLE);
        hdspe_write_4(sc, HDSPE_CONTROL_REG, sc->ctrl_register);
}

/* Multiplex / demultiplex: 2.0 <-> 2 x 1.0. */
static void
buffer_copy(struct sc_chinfo *ch)
{
        struct sc_pcminfo *scp = ch->parent;
        struct sc_info *sc = scp->sc;
        int length,src,dst;
        int ssize, dsize;
        int i;

        length = sndbuf_getready(ch->buffer) /
            (4 /* Bytes per sample. */ * 2 /* channels */);

        if (ch->dir == PCMDIR_PLAY) {
                src = sndbuf_getreadyptr(ch->buffer);
        } else {
                src = sndbuf_getfreeptr(ch->buffer);
        }

        src /= 4; /* Bytes per sample. */
        dst = src / 2; /* Destination buffer twice smaller. */

        ssize = ch->size / 4;
        dsize = ch->size / 8;

        /*
         * Use two fragment buffer to avoid sound clipping.
         */

        for (i = 0; i < sc->period * 2 /* fragments */; i++) {
                if (ch->dir == PCMDIR_PLAY) {
                        sc->pbuf[dst + HDSPE_CHANBUF_SAMPLES * ch->lslot] =
                            ch->data[src];
                        sc->pbuf[dst + HDSPE_CHANBUF_SAMPLES * ch->rslot] =
                            ch->data[src + 1];

                } else {
                        ch->data[src] =
                            sc->rbuf[dst + HDSPE_CHANBUF_SAMPLES * ch->lslot];
                        ch->data[src+1] =
                            sc->rbuf[dst + HDSPE_CHANBUF_SAMPLES * ch->rslot];
                }

                dst+=1;
                dst %= dsize;
                src+=2;
                src %= ssize;
        }
}

static int
clean(struct sc_chinfo *ch){
        struct sc_pcminfo *scp = ch->parent;
        struct sc_info *sc = scp->sc;
        uint32_t *buf = sc->rbuf;

        if (ch->dir == PCMDIR_PLAY) {
                buf = sc->pbuf;
        }

        bzero(buf + HDSPE_CHANBUF_SAMPLES * ch->lslot, HDSPE_CHANBUF_SIZE);
        bzero(buf + HDSPE_CHANBUF_SAMPLES * ch->rslot, HDSPE_CHANBUF_SIZE);

        return 0;
}


/* Channel interface. */
static void *
hdspechan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b,
               struct pcm_channel *c, int dir)
{
        struct sc_pcminfo *scp = devinfo;
        struct sc_info *sc = scp->sc;
        struct sc_chinfo *ch;
        int num;

        snd_mtxlock(sc->lock);
        num = scp->chnum;

        ch = &scp->chan[num];
        ch->lslot = scp->hc->left;
        ch->rslot = scp->hc->right;
        ch->run = 0;
        ch->lvol = 0;
        ch->rvol = 0;

        ch->size = HDSPE_CHANBUF_SIZE * 2 /* slots */;
        ch->data = kmalloc(ch->size, M_HDSPE, M_WAITOK | M_ZERO);

        ch->buffer = b;
        ch->channel = c;
        ch->parent = scp;

        ch->dir = dir;

        snd_mtxunlock(sc->lock);

        if (sndbuf_setup(ch->buffer, ch->data, ch->size) != 0) {
                device_printf(scp->dev, "Can't setup sndbuf.\n");
                return NULL;
        }

        return ch;
}

static int
hdspechan_trigger(kobj_t obj, void *data, int go)
{
        struct sc_chinfo *ch = data;
        struct sc_pcminfo *scp = ch->parent;
        struct sc_info *sc = scp->sc;

        snd_mtxlock(sc->lock);
        switch (go) {
        case PCMTRIG_START:
#if 0
                device_printf(scp->dev, "hdspechan_trigger(): start\n");
#endif
                hdspechan_enable(ch, 1);
                hdspechan_setgain(ch);
                hdspe_start_audio(sc);
                break;

        case PCMTRIG_STOP:
        case PCMTRIG_ABORT:
#if 0
                device_printf(scp->dev, "hdspechan_trigger(): stop or abort\n");
#endif
                clean(ch);
                hdspechan_enable(ch, 0);
                hdspe_stop_audio(sc);
                break;

        case PCMTRIG_EMLDMAWR:
        case PCMTRIG_EMLDMARD:
                if(ch->run)
                        buffer_copy(ch);
                break;
        }

        snd_mtxunlock(sc->lock);

        return 0;
}

static uint32_t
hdspechan_getptr(kobj_t obj, void *data)
{
        struct sc_chinfo *ch = data;
        struct sc_pcminfo *scp = ch->parent;
        struct sc_info *sc = scp->sc;
        uint32_t ret, pos;

        snd_mtxlock(sc->lock);
        ret = hdspe_read_2(sc, HDSPE_STATUS_REG);
        snd_mtxunlock(sc->lock);

        pos = ret & HDSPE_BUF_POSITION_MASK;
        pos *= 2; /* Hardbuf twice bigger. */

        return pos;
}

static int
hdspechan_free(kobj_t obj, void *data)
{
        struct sc_chinfo *ch = data;
        struct sc_pcminfo *scp = ch->parent;
        struct sc_info *sc = scp->sc;

#if 0
        device_printf(scp->dev, "hdspechan_free()\n");
#endif
        snd_mtxlock(sc->lock);
        if (ch->data != NULL) {
                kfree(ch->data, M_HDSPE);
                ch->data = NULL;
        }
        snd_mtxunlock(sc->lock);

        return 0;
}

static int
hdspechan_setformat(kobj_t obj, void *data, uint32_t format)
{
        struct sc_chinfo *ch = data;

#if 0
        struct sc_pcminfo *scp = ch->parent;
        device_printf(scp->dev, "hdspechan_setformat(%d)\n", format);
#endif

        ch->format = format;

        return 0;
}

static uint32_t
hdspechan_setspeed(kobj_t obj, void *data, uint32_t speed)
{
        struct sc_chinfo *ch = data;
        struct sc_pcminfo *scp = ch->parent;
        struct sc_info *sc = scp->sc;
        struct hdspe_rate *hr = NULL;
        long long period;
        int threshold;
        int i;

#if 0
        device_printf(scp->dev, "hdspechan_setspeed(%d)\n", speed);
#endif

        if (hdspe_running(sc) == 1)
                goto end;

        /* First look for equal frequency. */
        for (i = 0; rate_map[i].speed != 0; i++) {
                if (rate_map[i].speed == speed)
                        hr = &rate_map[i];
        }

        /* If no match, just find nearest. */
        if (hr == NULL) {
                for (i = 0; rate_map[i].speed != 0; i++) {
                        hr = &rate_map[i];
                        threshold = hr->speed + ((rate_map[i + 1].speed != 0) ?
                            ((rate_map[i + 1].speed - hr->speed) >> 1) : 0);
                        if (speed < threshold)
                                break;
                }
        }

        switch (sc->type) {
        case RAYDAT:
        case AIO:
                period = HDSPE_FREQ_AIO;
                break;
        default:
                /* Unsupported card. */
                goto end;
        }

        /* Write frequency on the device. */
        sc->ctrl_register &= ~HDSPE_FREQ_MASK;
        sc->ctrl_register |= hr->reg;
        hdspe_write_4(sc, HDSPE_CONTROL_REG, sc->ctrl_register);

        speed = hr->speed;
        if (speed > 96000)
                speed /= 4;
        else if (speed > 48000)
                speed /= 2;

        /* Set DDS value. */
        period /= speed;
        hdspe_write_4(sc, HDSPE_FREQ_REG, period);

        sc->speed = hr->speed;
end:
        return sc->speed;
}

static uint32_t
hdspechan_setblocksize(kobj_t obj, void *data, uint32_t blocksize)
{
        struct sc_chinfo *ch = data;
        struct sc_pcminfo *scp = ch->parent;
        struct sc_info *sc = scp->sc;
        struct hdspe_latency *hl = NULL;
        int threshold;
        int i;

#if 0
        device_printf(scp->dev, "hdspechan_setblocksize(%d)\n", blocksize);
#endif

        if (hdspe_running(sc) == 1)
                goto end;

        if (blocksize > HDSPE_LAT_BYTES_MAX)
                blocksize = HDSPE_LAT_BYTES_MAX;
        else if (blocksize < HDSPE_LAT_BYTES_MIN)
                blocksize = HDSPE_LAT_BYTES_MIN;

        blocksize /= 4 /* samples */;

        /* First look for equal latency. */
        for (i = 0; latency_map[i].period != 0; i++) {
                if (latency_map[i].period == blocksize) {
                        hl = &latency_map[i];
                }
        }

        /* If no match, just find nearest. */
        if (hl == NULL) {
                for (i = 0; latency_map[i].period != 0; i++) {
                        hl = &latency_map[i];
                        threshold = hl->period + ((latency_map[i + 1].period != 0) ?
                            ((latency_map[i + 1].period - hl->period) >> 1) : 0);
                        if (blocksize < threshold)
                                break;
                }
        }

        snd_mtxlock(sc->lock);
        sc->ctrl_register &= ~HDSPE_LAT_MASK;
        sc->ctrl_register |= hdspe_encode_latency(hl->n);
        hdspe_write_4(sc, HDSPE_CONTROL_REG, sc->ctrl_register);
        sc->period = hl->period;
        snd_mtxunlock(sc->lock);

#if 0
        device_printf(scp->dev, "New period=%d\n", sc->period);
#endif

        sndbuf_resize(ch->buffer, (HDSPE_CHANBUF_SIZE * 2) / (sc->period * 4),
            (sc->period * 4));
end:
        return sndbuf_getblksz(ch->buffer);
}

static uint32_t hdspe_rfmt[] = {
        SND_FORMAT(AFMT_S32_LE, 2, 0),
        0
};

static struct pcmchan_caps hdspe_rcaps = {32000, 192000, hdspe_rfmt, 0};

static uint32_t hdspe_pfmt[] = {
        SND_FORMAT(AFMT_S32_LE, 2, 0),
        0
};

static struct pcmchan_caps hdspe_pcaps = {32000, 192000, hdspe_pfmt, 0};

static struct pcmchan_caps *
hdspechan_getcaps(kobj_t obj, void *data)
{
        struct sc_chinfo *ch = data;

#if 0
        struct sc_pcminfo *scl = ch->parent;
        device_printf(scp->dev, "hdspechan_getcaps()\n");
#endif

        return (ch->dir == PCMDIR_PLAY) ?
            &hdspe_pcaps : &hdspe_rcaps;
}

static kobj_method_t hdspechan_methods[] = {
        KOBJMETHOD(channel_init,         hdspechan_init),
        KOBJMETHOD(channel_free,         hdspechan_free),
        KOBJMETHOD(channel_setformat,    hdspechan_setformat),
        KOBJMETHOD(channel_setspeed,     hdspechan_setspeed),
        KOBJMETHOD(channel_setblocksize, hdspechan_setblocksize),
        KOBJMETHOD(channel_trigger,      hdspechan_trigger),
        KOBJMETHOD(channel_getptr,       hdspechan_getptr),
        KOBJMETHOD(channel_getcaps,      hdspechan_getcaps),
        KOBJMETHOD_END
};
CHANNEL_DECLARE(hdspechan);


static int
hdspe_pcm_probe(device_t dev)
{

#if 0
        device_printf(dev,"hdspe_pcm_probe()\n");
#endif

        return 0;
}

static uint32_t
hdspe_pcm_intr(struct sc_pcminfo *scp) {
        struct sc_chinfo *ch;
        struct sc_info *sc = scp->sc;
        int i;

        for (i = 0; i < scp->chnum; i++) {
                ch = &scp->chan[i];
                snd_mtxunlock(sc->lock);
                chn_intr(ch->channel);
                snd_mtxlock(sc->lock);
        }

        return 0;
}

static int
hdspe_pcm_attach(device_t dev)
{
        struct sc_pcminfo *scp;
        char status[SND_STATUSLEN];
        char desc[64];
        int i, err;

        scp = device_get_ivars(dev);
        scp->ih = &hdspe_pcm_intr;

        bzero(desc, sizeof(desc));
        ksnprintf(desc, sizeof(desc), "HDSPe AIO [%s]", scp->hc->descr);
        device_set_desc_copy(dev, desc);

        /*
         * We don't register interrupt handler with snd_setup_intr
         * in pcm device. Mark pcm device as MPSAFE manually.
         */
        pcm_setflags(dev, pcm_getflags(dev) | SD_F_MPSAFE);

        err = pcm_register(dev, scp, scp->hc->play, scp->hc->rec);
        if (err) {
                device_printf(dev, "Can't register pcm.\n");
                return ENXIO;
        }

        scp->chnum = 0;
        for (i = 0; i < scp->hc->play; i++) {
                pcm_addchan(dev, PCMDIR_PLAY, &hdspechan_class, scp);
                scp->chnum++;
        }

        for (i = 0; i < scp->hc->rec; i++) {
                pcm_addchan(dev, PCMDIR_REC, &hdspechan_class, scp);
                scp->chnum++;
        }

        ksnprintf(status, SND_STATUSLEN, "at io 0x%lx irq %ld %s",
            rman_get_start(scp->sc->cs),
            rman_get_start(scp->sc->irq),
            PCM_KLDSTRING(snd_hdspe));
        pcm_setstatus(dev, status);

        mixer_init(dev, &hdspemixer_class, scp);

        return 0;
}

static int
hdspe_pcm_detach(device_t dev)
{
        int err;

        err = pcm_unregister(dev);
        if (err) {
                device_printf(dev, "Can't unregister device.\n");
                return err;
        }

        return 0;
}

static device_method_t hdspe_pcm_methods[] = {
        DEVMETHOD(device_probe,     hdspe_pcm_probe),
        DEVMETHOD(device_attach,    hdspe_pcm_attach),
        DEVMETHOD(device_detach,    hdspe_pcm_detach),
        { 0, 0 }
};

static driver_t hdspe_pcm_driver = {
        "pcm",
        hdspe_pcm_methods,
        PCM_SOFTC_SIZE,
};

DRIVER_MODULE(snd_hdspe_pcm, hdspe, hdspe_pcm_driver, pcm_devclass, NULL, NULL);
MODULE_DEPEND(snd_hdspe, sound, SOUND_MINVER, SOUND_PREFVER, SOUND_MAXVER);
MODULE_VERSION(snd_hdspe, 1);