/*      $NetBSD: aica.c,v 1.31 2024/02/07 04:20:27 msaitoh Exp $        */

/*
 * Copyright (c) 2003 SHIMIZU Ryo
 * 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: aica.c,v 1.31 2024/02/07 04:20:27 msaitoh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/audioio.h>
#include <sys/bus.h>

#include <dev/audio/audio_if.h>
#include <dev/audio/audiovar.h> /* AUDIO_MIN_FREQUENCY */

#include <machine/sysasicvar.h>

#include <dreamcast/dev/g2/g2busvar.h>
#include <dreamcast/dev/g2/aicavar.h>
#include <dreamcast/dev/microcode/aica_armcode.h>

#define AICA_REG_ADDR   0x00700000
#define AICA_RAM_START  0x00800000
#define AICA_RAM_SIZE   0x00200000
#define AICA_NCHAN      64
#define AICA_TIMEOUT    0x1800

struct aica_softc {
        device_t                sc_dev;         /* base device */
        kmutex_t                sc_lock;
        kmutex_t                sc_intr_lock;
        bus_space_tag_t         sc_memt;
        bus_space_handle_t      sc_aica_regh;
        bus_space_handle_t      sc_aica_memh;

        /* audio property */
        int                     sc_precision;
        int                     sc_channels;
        int                     sc_rate;
        void                    (*sc_intr)(void *);
        void                    *sc_intr_arg;

        int                     sc_output_master;
        int                     sc_output_gain[2];
#define AICA_VOLUME_LEFT        0
#define AICA_VOLUME_RIGHT       1

        /* work for output */
        void                    *sc_buffer;
        void                    *sc_buffer_start;
        void                    *sc_buffer_end;
        int                     sc_blksize;
        int                     sc_nextfill;
};

static const struct audio_format aica_formats[] = {
        {
                .mode           = AUMODE_PLAY,
                .encoding       = AUDIO_ENCODING_SLINEAR_LE,
                .validbits      = 16,
                .precision      = 16,
                .channels       = 2,
                .channel_mask   = AUFMT_STEREO,
                .frequency_type = 0,
                .frequency      = { AUDIO_MIN_FREQUENCY, 65536 },
        },
};
#define AICA_NFORMATS   __arraycount(aica_formats)

int aica_match(device_t, cfdata_t, void *);
void aica_attach(device_t, device_t, void *);
int aica_print(void *, const char *);

CFATTACH_DECL_NEW(aica, sizeof(struct aica_softc), aica_match, aica_attach,
    NULL, NULL);

const struct audio_device aica_device = {
        "Dreamcast Sound",
        "",
        "aica"
};

inline static void aica_g2fifo_wait(void);
void aica_enable(struct aica_softc *);
void aica_disable(struct aica_softc *);
void aica_memwrite(struct aica_softc *, bus_size_t, uint32_t *, int);
void aica_ch2p16write(struct aica_softc *, bus_size_t, uint16_t *, int);
void aica_ch2p8write(struct aica_softc *, bus_size_t, uint8_t *, int);
void aica_command(struct aica_softc *, uint32_t);
void aica_sendparam(struct aica_softc *, uint32_t, int, int);
void aica_play(struct aica_softc *, int, int, int, int);
void aica_fillbuffer(struct aica_softc *);

/* intr */
int aica_intr(void *);

/* for audio */
int aica_query_format(void *, audio_format_query_t *);
int aica_set_format(void *, int,
    const audio_params_t *, const audio_params_t *,
    audio_filter_reg_t *, audio_filter_reg_t *);
int aica_round_blocksize(void *, int, int, const audio_params_t *);
size_t aica_round_buffersize(void *, int, size_t);
int aica_trigger_output(void *, void *, void *, int, void (*)(void *), void *,
    const audio_params_t *);
int aica_halt_output(void *);
int aica_getdev(void *, struct audio_device *);
int aica_set_port(void *, mixer_ctrl_t *);
int aica_get_port(void *, mixer_ctrl_t *);
int aica_query_devinfo(void *, mixer_devinfo_t *);
void aica_encode(int, int, int, int, u_char *, u_short **);
int aica_get_props(void *);
void aica_get_locks(void *, kmutex_t **, kmutex_t **);

const struct audio_hw_if aica_hw_if = {
        .query_format           = aica_query_format,
        .set_format             = aica_set_format,
        .round_blocksize        = aica_round_blocksize,
        .halt_output            = aica_halt_output,
        .getdev                 = aica_getdev,
        .set_port               = aica_set_port,
        .get_port               = aica_get_port,
        .query_devinfo          = aica_query_devinfo,
        .round_buffersize       = aica_round_buffersize,
        .get_props              = aica_get_props,
        .trigger_output         = aica_trigger_output,
        .get_locks              = aica_get_locks,
};

int
aica_match(device_t parent, cfdata_t cf, void *aux)
{
        static int aica_matched = 0;

        if (aica_matched)
                return 0;

        aica_matched = 1;
        return 1;
}

void
aica_attach(device_t parent, device_t self, void *aux)
{
        struct aica_softc *sc;
        struct g2bus_attach_args *ga;
        int i;

        sc = device_private(self);
        ga = aux;
        sc->sc_dev = self;
        sc->sc_memt = ga->ga_memt;

        mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
        mutex_init(&sc->sc_intr_lock, MUTEX_DEFAULT, IPL_SCHED);

        if (bus_space_map(sc->sc_memt, AICA_REG_ADDR, 0x3000, 0,
            &sc->sc_aica_regh) != 0) {
                aprint_error(": can't map AICA register space\n");
                return;
        }

        if (bus_space_map(sc->sc_memt, AICA_RAM_START, AICA_RAM_SIZE, 0,
            &sc->sc_aica_memh) != 0) {
                aprint_error(": can't map AICA memory space\n");
                return;
        }

        aprint_normal(": ARM7 Sound Processing Unit\n");

        aica_disable(sc);

        for (i = 0; i < AICA_NCHAN; i++)
                bus_space_write_4(sc->sc_memt,sc->sc_aica_regh, i << 7,
                    ((bus_space_read_4(sc->sc_memt, sc->sc_aica_regh, i << 7)
                    & ~0x4000) | 0x8000));

        /* load microcode, and clear memory */
        bus_space_set_region_4(sc->sc_memt, sc->sc_aica_memh,
            0, 0, AICA_RAM_SIZE / 4);

        aica_memwrite(sc, 0, aica_armcode, sizeof(aica_armcode));

        aica_enable(sc);

        aprint_normal_dev(self, "interrupting at %s\n",
            sysasic_intr_string(SYSASIC_IRL9));
        sysasic_intr_establish(SYSASIC_EVENT_AICA, IPL_BIO, SYSASIC_IRL9,
            aica_intr, sc);

        audio_attach_mi(&aica_hw_if, sc, self);

        /* init parameters */
        sc->sc_output_master = 255;
        sc->sc_output_gain[AICA_VOLUME_LEFT]  = 255;
        sc->sc_output_gain[AICA_VOLUME_RIGHT] = 255;
}

void
aica_enable(struct aica_softc *sc)
{

        bus_space_write_4(sc->sc_memt, sc->sc_aica_regh, 0x28a8, 24);
        bus_space_write_4(sc->sc_memt, sc->sc_aica_regh, 0x2c00,
            bus_space_read_4(sc->sc_memt, sc->sc_aica_regh, 0x2c00) & ~1);
}

void
aica_disable(struct aica_softc *sc)
{

        bus_space_write_4(sc->sc_memt, sc->sc_aica_regh, 0x2c00,
            bus_space_read_4(sc->sc_memt, sc->sc_aica_regh, 0x2c00) | 1);
}

inline static void
aica_g2fifo_wait(void)
{
        int i;

        i = AICA_TIMEOUT;
        while (--i > 0)
                if ((*(volatile uint32_t *)0xa05f688c) & 0x11)
                        break;
}

void
aica_memwrite(struct aica_softc *sc, bus_size_t offset, uint32_t *src, int len)
{
        int n;

        KASSERT((offset & 3) == 0);
        n = (len + 3) / 4;      /* uint32_t * n (aligned) */

        aica_g2fifo_wait();
        bus_space_write_region_4(sc->sc_memt, sc->sc_aica_memh,
            offset, src, n);
}

void
aica_ch2p16write(struct aica_softc *sc, bus_size_t offset, uint16_t *src,
    int len)
{
        union {
                uint32_t w[8];
                uint16_t s[16];
        } buf;
        uint16_t *p;
        int i;

        KASSERT((offset & 3) == 0);

        while (len >= 32) {
                p = buf.s;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;

                aica_g2fifo_wait();
                bus_space_write_region_4(sc->sc_memt, sc->sc_aica_memh,
                    offset, buf.w , 32 / 4);

                offset += sizeof(uint16_t) * 16;
                len -= 32;
        }

        if (len / 2 > 0) {
                p = buf.s;
                for (i = 0; i < len / 2; i++) {
                        *p++ = *src++; src++;
                }

                aica_g2fifo_wait();
                bus_space_write_region_4(sc->sc_memt, sc->sc_aica_memh,
                    offset, buf.w, len / 4);
        }
}

void
aica_ch2p8write(struct aica_softc *sc, bus_size_t offset, uint8_t *src,
    int len)
{
        uint32_t buf[8];
        uint8_t *p;
        int i;

        KASSERT((offset & 3) == 0);
        while (len >= 32) {
                p = (uint8_t *)buf;

                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;
                *p++ = *src++; src++;

                aica_g2fifo_wait();
                bus_space_write_region_4(sc->sc_memt, sc->sc_aica_memh,
                    offset, buf, 32 / 4);

                offset += 32;
                len -= 32;
        }

        if (len) {
                p = (uint8_t *)buf;
                for (i = 0; i < len; i++) {
                        *p++ = *src++; src++;
                }

                aica_g2fifo_wait();
                bus_space_write_region_4(sc->sc_memt, sc->sc_aica_memh,
                    offset, buf, len / 4);
        }
}

int
aica_query_format(void *addr, audio_format_query_t *afp)
{

        return audio_query_format(aica_formats, AICA_NFORMATS, afp);
}

int
aica_set_format(void *addr, int setmode,
    const audio_params_t *play, const audio_params_t *rec,
    audio_filter_reg_t *pfil, audio_filter_reg_t *rfil)
{
        struct aica_softc *sc;

        sc = addr;
        sc->sc_precision = play->precision;
        sc->sc_channels = play->channels;
        sc->sc_rate = play->sample_rate;
        return 0;
}

int
aica_round_blocksize(void *addr, int blk, int mode, const audio_params_t *param)
{
#if 0   /* XXX this has not worked since kent-audio1 merge? */
        struct aica_softc *sc;

        sc = addr;
        switch (sc->sc_precision) {
        case 4:
                if (sc->sc_channels == 1)
                        return AICA_DMABUF_SIZE / 4;
                else
                        return AICA_DMABUF_SIZE / 2;
                break;
        case 8:
                if (sc->sc_channels == 1)
                        return AICA_DMABUF_SIZE / 2;
                else
                        return AICA_DMABUF_SIZE;
                break;
        case 16:
                if (sc->sc_channels == 1)
                        return AICA_DMABUF_SIZE;
                else
                        return AICA_DMABUF_SIZE * 2;
                break;
        default:
                break;
        }

#endif
        return AICA_DMABUF_SIZE / 4;
}

size_t
aica_round_buffersize(void *addr, int dir, size_t bufsize)
{
        struct aica_softc *sc;

        sc = addr;
        if (bufsize > 65536 * sc->sc_channels)
                return 65536 * sc->sc_channels;
        return bufsize;
}

void
aica_command(struct aica_softc *sc, uint32_t command)
{

        bus_space_write_4(sc->sc_memt, sc->sc_aica_memh,
            AICA_ARM_CMD_COMMAND, command);
        bus_space_write_4(sc->sc_memt,sc->sc_aica_memh, AICA_ARM_CMD_SERIAL,
            bus_space_read_4(sc->sc_memt, sc->sc_aica_memh,
            AICA_ARM_CMD_SERIAL) + 1);
}

void
aica_sendparam(struct aica_softc *sc, uint32_t command,
    int32_t lparam, int32_t rparam)
{

        bus_space_write_4(sc->sc_memt,sc->sc_aica_memh,
            AICA_ARM_CMD_LPARAM, lparam);
        bus_space_write_4(sc->sc_memt,sc->sc_aica_memh,
            AICA_ARM_CMD_RPARAM, rparam);

        aica_command(sc, command);
}

void
aica_play(struct aica_softc *sc, int blksize, int channel, int rate, int prec)
{

        bus_space_write_4(sc->sc_memt,sc->sc_aica_memh,
            AICA_ARM_CMD_BLOCKSIZE, blksize);
        bus_space_write_4(sc->sc_memt,sc->sc_aica_memh,
            AICA_ARM_CMD_CHANNEL, channel);
        bus_space_write_4(sc->sc_memt,sc->sc_aica_memh,
            AICA_ARM_CMD_RATE, rate);
        bus_space_write_4(sc->sc_memt,sc->sc_aica_memh,
            AICA_ARM_CMD_PRECISION, prec);

        aica_command(sc, AICA_COMMAND_PLAY);
}

void
aica_fillbuffer(struct aica_softc *sc)
{

        if (sc->sc_channels == 2) {
                if (sc->sc_precision == 16) {
                        aica_ch2p16write(sc,
                            AICA_DMABUF_LEFT + sc->sc_nextfill,
                            (uint16_t *)sc->sc_buffer + 0, sc->sc_blksize / 2);
                        aica_ch2p16write(sc,
                            AICA_DMABUF_RIGHT + sc->sc_nextfill,
                            (uint16_t *)sc->sc_buffer + 1, sc->sc_blksize / 2);
                } else if (sc->sc_precision == 8) {
                        aica_ch2p8write(sc, AICA_DMABUF_LEFT + sc->sc_nextfill,
                            (uint8_t *)sc->sc_buffer + 0, sc->sc_blksize / 2);
                        aica_ch2p8write(sc, AICA_DMABUF_RIGHT + sc->sc_nextfill,
                            (uint8_t *)sc->sc_buffer + 1, sc->sc_blksize / 2);
                }
        } else {
                aica_memwrite(sc, AICA_DMABUF_MONO + sc->sc_nextfill,
                    sc->sc_buffer, sc->sc_blksize);
        }

        sc->sc_buffer = (int8_t *)sc->sc_buffer + sc->sc_blksize;
        if (sc->sc_buffer >= sc->sc_buffer_end)
                sc->sc_buffer = sc->sc_buffer_start;

        sc->sc_nextfill ^= sc->sc_blksize / sc->sc_channels;
}

int
aica_intr(void *arg)
{
        struct aica_softc *sc;

        sc = arg;

        mutex_spin_enter(&sc->sc_intr_lock);

        aica_fillbuffer(sc);

        /* call audio interrupt handler (audio_pintr()) */
        if (sc->sc_intr != NULL) {
                (*(sc->sc_intr))(sc->sc_intr_arg);
        }

        /* clear SPU interrupt */
        bus_space_write_4(sc->sc_memt, sc->sc_aica_regh, 0x28bc, 0x20);

        mutex_spin_exit(&sc->sc_intr_lock);

        return 1;
}

int
aica_trigger_output(void *addr, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, const audio_params_t *param)
{
        struct aica_softc *sc;

        sc = addr;

        sc->sc_buffer_start = sc->sc_buffer = start;
        sc->sc_buffer_end = end;
        sc->sc_blksize = blksize;
        sc->sc_nextfill = 0;

        sc->sc_intr = intr;
        sc->sc_intr_arg = arg;

        /*
         * The aica arm side driver uses a double buffer to play sounds.
         * we need to fill two buffers before playing.
         */
        aica_fillbuffer(sc);
        aica_fillbuffer(sc);

        /* ...and start playing */
        aica_play(sc, blksize / sc->sc_channels, sc->sc_channels, sc->sc_rate,
            sc->sc_precision);

        return 0;
}

int
aica_halt_output(void *addr)
{
        struct aica_softc *sc;

        sc = addr;
        aica_command(sc, AICA_COMMAND_STOP);
        sc->sc_intr = NULL;
        return 0;
}

int
aica_getdev(void *addr, struct audio_device *ret)
{

        *ret = aica_device;
        return 0;
}

int
aica_set_port(void *addr, mixer_ctrl_t *mc)
{
        struct aica_softc *sc;

        sc = addr;
        switch (mc->dev) {
        case AICA_MASTER_VOL:
                sc->sc_output_master =
                    mc->un.value.level[AUDIO_MIXER_LEVEL_MONO] & 0xff;
                aica_sendparam(sc, AICA_COMMAND_MVOL,
                    sc->sc_output_master, sc->sc_output_master);
                break;
        case AICA_OUTPUT_GAIN:
                sc->sc_output_gain[AICA_VOLUME_LEFT] =
                    mc->un.value.level[AUDIO_MIXER_LEVEL_LEFT]  & 0xff;
                sc->sc_output_gain[AICA_VOLUME_RIGHT] =
                    mc->un.value.level[AUDIO_MIXER_LEVEL_RIGHT] & 0xff;
                aica_sendparam(sc, AICA_COMMAND_VOL,
                    sc->sc_output_gain[AICA_VOLUME_LEFT],
                    sc->sc_output_gain[AICA_VOLUME_RIGHT]);
                break;
        default:
                return EINVAL;
        }

        return 0;
}

int
aica_get_port(void *addr, mixer_ctrl_t *mc)
{
        struct aica_softc *sc;

        sc = addr;
        switch (mc->dev) {
        case AICA_MASTER_VOL:
                if (mc->un.value.num_channels != 1)
                        return EINVAL;
                mc->un.value.level[AUDIO_MIXER_LEVEL_MONO] =
                    L16TO256(L256TO16(sc->sc_output_master));
                break;
        case AICA_OUTPUT_GAIN:
                mc->un.value.level[AUDIO_MIXER_LEVEL_LEFT] =
                    sc->sc_output_gain[AICA_VOLUME_LEFT];
                mc->un.value.level[AUDIO_MIXER_LEVEL_RIGHT] =
                    sc->sc_output_gain[AICA_VOLUME_RIGHT];
                break;
        default:
                return EINVAL;
        }
        return 0;
}

int
aica_query_devinfo(void *addr, mixer_devinfo_t *md)
{

        switch (md->index) {
        case AICA_MASTER_VOL:
                md->type = AUDIO_MIXER_VALUE;
                md->mixer_class = AICA_OUTPUT_CLASS;
                md->prev = md->next = AUDIO_MIXER_LAST;
                strcpy(md->label.name, AudioNmaster);
                md->un.v.num_channels = 1;
                strcpy(md->un.v.units.name, AudioNvolume);
                return 0;
        case AICA_OUTPUT_GAIN:
                md->type = AUDIO_MIXER_VALUE;
                md->mixer_class = AICA_OUTPUT_CLASS;
                md->prev = md->next = AUDIO_MIXER_LAST;
                strcpy(md->label.name, AudioNoutput);
                md->un.v.num_channels = 2;
                strcpy(md->label.name, AudioNvolume);
                return 0;
        case AICA_OUTPUT_CLASS:
                md->type = AUDIO_MIXER_CLASS;
                md->mixer_class = AICA_OUTPUT_CLASS;
                md->next = md->prev = AUDIO_MIXER_LAST;
                strcpy(md->label.name, AudioCoutputs);
                return 0;
        }

        return ENXIO;
}

int
aica_get_props(void *addr)
{

        return AUDIO_PROP_PLAYBACK;
}

void
aica_get_locks(void *addr, kmutex_t **intr, kmutex_t **thread)
{
        struct aica_softc *sc;

        sc = addr;
        *intr = &sc->sc_intr_lock;
        *thread = &sc->sc_lock;
}