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#include "emu.h"

#include "2203intf.h"

#include "fm.h"

struct ym2203_state

{

        sound_stream *  stream;

        emu_timer *     timer[2];

        void *          chip;

        void *          psg;

        const ym2203_interface *intf;

        devcb_resolved_write_line irqhandler;

        device_t *device;

};

INLINE ym2203_state *get_safe_token(device_t *device)

{

        assert(device != NULL);

        assert(device->type() == YM2203);

        return (ym2203_state *)downcast<ym2203_device *>(device)->token();

}

static void psg_set_clock(void *param, int clock)

{

        ym2203_state *info = (ym2203_state *)param;

        ay8910_set_clock_ym(info->psg, clock);

}

static void psg_write(void *param, int address, int data)

{

        ym2203_state *info = (ym2203_state *)param;

        ay8910_write_ym(info->psg, address, data);

}

static int psg_read(void *param)

{

        ym2203_state *info = (ym2203_state *)param;

        return ay8910_read_ym(info->psg);

}

static void psg_reset(void *param)

{

        ym2203_state *info = (ym2203_state *)param;

        ay8910_reset_ym(info->psg);

}

static const ssg_callbacks psgintf =

{

        psg_set_clock,

        psg_write,

        psg_read,

        psg_reset

};

/* IRQ Handler */

static void IRQHandler(void *param,int irq)

{

        ym2203_state *info = (ym2203_state *)param;

        if (!info->irqhandler.isnull())

                info->irqhandler(irq);

}

/* Timer overflow callback from timer.c */

static TIMER_CALLBACK( timer_callback_2203_0 )

{

        ym2203_state *info = (ym2203_state *)ptr;

        ym2203_timer_over(info->chip,0);

}

static TIMER_CALLBACK( timer_callback_2203_1 )

{

        ym2203_state *info = (ym2203_state *)ptr;

        ym2203_timer_over(info->chip,1);

}

/* update request from fm.c */

void ym2203_update_request(void *param)

{

        ym2203_state *info = (ym2203_state *)param;

        info->stream->update();

}

static void timer_handler(void *param,int c,int count,int clock)

{

        ym2203_state *info = (ym2203_state *)param;

        if( count == 0 )

        {   /* Reset FM Timer */

                info->timer[c]->enable(false);

        }

        else

        {   /* Start FM Timer */

                attotime period = attotime::from_hz(clock) * count;

                if (!info->timer[c]->enable(true))

                        info->timer[c]->adjust(period);

        }

}

static STREAM_UPDATE( ym2203_stream_update )

{

        ym2203_state *info = (ym2203_state *)param;

        ym2203_update_one(info->chip, outputs[0], samples);

}

static void ym2203_intf_postload (ym2203_state *info)

{

        ym2203_postload(info->chip);

}

static DEVICE_START( ym2203 )

{

        static const ym2203_interface generic_2203 =

        {

                {

                        AY8910_LEGACY_OUTPUT,

                        AY8910_DEFAULT_LOADS,

                        DEVCB_NULL, DEVCB_NULL, DEVCB_NULL, DEVCB_NULL

                },

                DEVCB_NULL

        };

        const ym2203_interface *intf = device->static_config() ? (const ym2203_interface *)device->static_config() : &generic_2203;

        ym2203_state *info = get_safe_token(device);

        int rate = device->clock()/72; /* ??? */

        info->irqhandler.resolve(intf->irqhandler, *device);

        info->intf = intf;

        info->device = device;

        info->psg = ay8910_start_ym(NULL, YM2203, device, device->clock(), &intf->ay8910_intf);

        assert_always(info->psg != NULL, "Error creating YM2203/AY8910 chip");

        /* Timer Handler set */

        info->timer[0] = device->machine().scheduler().timer_alloc(FUNC(timer_callback_2203_0), info);

        info->timer[1] = device->machine().scheduler().timer_alloc(FUNC(timer_callback_2203_1), info);

        /* stream system initialize */

        info->stream = device->machine().sound().stream_alloc(*device,0,1,rate,info,ym2203_stream_update);

        /* Initialize FM emurator */

        info->chip = ym2203_init(info,device,device->clock(),rate,timer_handler,IRQHandler,&psgintf);

        assert_always(info->chip != NULL, "Error creating YM2203 chip");

        device->machine().save().register_postload(save_prepost_delegate(FUNC(ym2203_intf_postload), info));

}

static DEVICE_STOP( ym2203 )

{

        ym2203_state *info = get_safe_token(device);

        ym2203_shutdown(info->chip);

        ay8910_stop_ym(info->psg);

}

static DEVICE_RESET( ym2203 )

{

        ym2203_state *info = get_safe_token(device);

        ym2203_reset_chip(info->chip);

}

READ8_DEVICE_HANDLER( ym2203_r )

{

        ym2203_state *info = get_safe_token(device);

        return ym2203_read(info->chip, offset & 1);

}

WRITE8_DEVICE_HANDLER( ym2203_w )

{

        ym2203_state *info = get_safe_token(device);

        ym2203_write(info->chip, offset & 1, data);

}

READ8_DEVICE_HANDLER( ym2203_status_port_r ) { return ym2203_r(device, space, 0); }

READ8_DEVICE_HANDLER( ym2203_read_port_r ) { return ym2203_r(device, space, 1); }

WRITE8_DEVICE_HANDLER( ym2203_control_port_w ) { ym2203_w(device, space, 0, data); }

WRITE8_DEVICE_HANDLER( ym2203_write_port_w ) { ym2203_w(device, space, 1, data); }

const device_type YM2203 = &device_creator<ym2203_device>;

ym2203_device::ym2203_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)

        : device_t(mconfig, YM2203, "YM2203", tag, owner, clock),

                device_sound_interface(mconfig, *this)

{

        m_token = global_alloc_clear(ym2203_state);

}

//-------------------------------------------------

//  device_config_complete - perform any

//  operations now that the configuration is

//  complete

//-------------------------------------------------

void ym2203_device::device_config_complete()

{

}

//-------------------------------------------------

//  device_start - device-specific startup

//-------------------------------------------------

void ym2203_device::device_start()

{

        DEVICE_START_NAME( ym2203 )(this);

}

//-------------------------------------------------

//  device_reset - device-specific reset

//-------------------------------------------------

void ym2203_device::device_reset()

{

        DEVICE_RESET_NAME( ym2203 )(this);

}

//-------------------------------------------------

//  device_stop - device-specific stop

//-------------------------------------------------

void ym2203_device::device_stop()

{

        DEVICE_STOP_NAME( ym2203 )(this);

}

//-------------------------------------------------

//  sound_stream_update - handle a stream update

//-------------------------------------------------

void ym2203_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)

{

        // should never get here

        fatalerror("sound_stream_update called; not applicable to legacy sound devices\n");

}