/*	$NetBSD: vidcaudio.c,v 1.23 1998/06/02 20:41:55 mark Exp $	*/

/*
 * Copyright (c) 1995 Melvin Tang-Richardson
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the RiscBSD team.
 * 4. 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.
 */

/*
 * Yikes just had a look at this and realised that it does not conform
 * to Kernel Normal Form at all. I have fixed the first few functions
 * but there are a lot more still to do - mark
 */

/*
 * audio driver for the RiscPC 16 bit sound
 *
 * Interfaces with the NetBSD generic audio driver to provide SUN
 * /dev/audio (partial) compatibility.
 *
 */

#include "opt_uvm.h"

#include <sys/param.h>	/* proc.h */
#include <sys/types.h>  /* dunno  */
#include <sys/conf.h>   /* autoconfig functions */
#include <sys/device.h> /* device calls */
#include <sys/proc.h>	/* device calls */
#include <sys/audioio.h>
#include <sys/errno.h>
#include <sys/systm.h>

#include <vm/vm.h>
#include <vm/vm_kern.h>

#if defined(UVM)
#include <uvm/uvm_extern.h>
#endif

#include <dev/audio_if.h>

#include <machine/irqhandler.h>
#include <machine/vidc.h>
#include <machine/katelib.h>

#include <arm32/iomd/iomdreg.h>
#include <arm32/mainbus/mainbus.h>
#include <arm32/vidc/waveform.h>
#include "vidcaudio.h"

#undef DEBUG

struct audio_general {
	vm_offset_t silence;
	irqhandler_t ih;

	void (*intr) ();
	void *arg;

	vm_offset_t next_cur;
	vm_offset_t next_end;
	void (*next_intr) ();
	void *next_arg;

	int buffer;
	int in_progress;

	int open;
} ag;

struct vidcaudio_softc {
	struct device device;
	int iobase;

	int open;
};

int  vidcaudio_probe	__P((struct device *parent, struct cfdata *cf, void *aux));
void vidcaudio_attach	__P((struct device *parent, struct device *self, void *aux));
int  vidcaudio_open	__P((void *addr, int flags));
void vidcaudio_close	__P((void *addr));

int vidcaudio_intr	__P((void *arg));
int vidcaudio_dma_program	__P((vm_offset_t cur, vm_offset_t end, void (*intr)(), void *arg));
void vidcaudio_dummy_routine	__P((void *arg));
int vidcaudio_stereo	__P((int channel, int position));
int vidcaudio_rate	__P((int rate));
void vidcaudio_shutdown	__P((void));

static int sound_dma_intr;

struct cfattach vidcaudio_ca = {
	sizeof(struct vidcaudio_softc), vidcaudio_probe, vidcaudio_attach
};

int    vidcaudio_query_encoding  __P((void *, struct audio_encoding *));
int    vidcaudio_set_params	 __P((void *, int, int, struct audio_params *, struct audio_params *));
int    vidcaudio_round_blocksize __P((void *, int));
int    vidcaudio_start_output	 __P((void *, void *, int, void (*)(), void *));
int    vidcaudio_start_input	 __P((void *, void *, int, void (*)(), void *));
int    vidcaudio_halt_output	 __P((void *));
int    vidcaudio_halt_input 	 __P((void *));
int    vidcaudio_speaker_ctl	 __P((void *, int));
int    vidcaudio_getdev		 __P((void *, struct audio_device *));
int    vidcaudio_set_port	 __P((void *, mixer_ctrl_t *));
int    vidcaudio_get_port	 __P((void *, mixer_ctrl_t *));
int    vidcaudio_query_devinfo	 __P((void *, mixer_devinfo_t *));
int    vidcaudio_get_props	 __P((void *));

struct audio_device vidcaudio_device = {
	"VidcAudio 8-bit",
	"x",
	"vidcaudio"
};

struct audio_hw_if vidcaudio_hw_if = {
    vidcaudio_open,
    vidcaudio_close,
    0,
    vidcaudio_query_encoding,
    vidcaudio_set_params,
    vidcaudio_round_blocksize,
    0,
    0,
    0,
    vidcaudio_start_output,
    vidcaudio_start_input,
    vidcaudio_halt_output,
    vidcaudio_halt_input,
    vidcaudio_speaker_ctl,
    vidcaudio_getdev,
    0,
    vidcaudio_set_port,
    vidcaudio_get_port,
    vidcaudio_query_devinfo,
    0,
    0,
    0,
    0,
    vidcaudio_get_props,
};


void
vidcaudio_beep_generate()
{
	vidcaudio_dma_program ( ag.silence, ag.silence+sizeof(beep_waveform)-16,
	    vidcaudio_dummy_routine, NULL );
}


int
vidcaudio_probe(parent, cf, aux)
	struct device *parent;
	struct cfdata* cf;
	void *aux;
{
	int id;

	id = IOMD_ID;

/* So far I only know about this IOMD */

	switch (id) {
	case RPC600_IOMD_ID:
		return(1);
		break;
	case ARM7500_IOC_ID:
	case ARM7500FE_IOC_ID:
#ifdef RC7500
		return(0);
#else
		return(1);
#endif
		break;
	default:
		printf("vidcaudio: Unknown IOMD id=%04x", id);
		break;
	}

	return (0);
}


void
vidcaudio_attach(parent, self, aux)
	struct device *parent;
	struct device *self;
	void *aux;
{
	struct mainbus_attach_args *mb = aux;
	struct vidcaudio_softc *sc = (void *)self;
	int id;

	sc->iobase = mb->mb_iobase;

	sc->open = 0;
	ag.in_progress = 0;

	ag.next_cur = 0;
	ag.next_end = 0;
	ag.next_intr = NULL;
	ag.next_arg = NULL;

	vidcaudio_rate(32); /* 24*1024*/

	/* Program the silence buffer and reset the DMA channel */
#if defined(UVM)
	ag.silence = uvm_km_alloc(kernel_map, NBPG);
#else
	ag.silence = kmem_alloc(kernel_map, NBPG);
#endif
	if (ag.silence == NULL)
		panic("vidcaudio: Cannot allocate memory\n");

	bzero((char *)ag.silence, NBPG);
	bcopy((char *)beep_waveform, (char *)ag.silence, sizeof(beep_waveform));

	ag.buffer = 0;

	/* Install the irq handler for the DMA interrupt */
	ag.ih.ih_func = vidcaudio_intr;
	ag.ih.ih_arg = NULL;
	ag.ih.ih_level = IPL_NONE;
	ag.ih.ih_name = "vidcaudio";

	ag.intr = NULL;
/*	ag.nextintr = NULL;*/

	id = IOMD_ID;

	switch (id) {
#ifndef CPU_ARM7500
	case RPC600_IOMD_ID:
		sound_dma_intr = IRQ_DMASCH0;
		break;
#else
	case ARM7500_IOC_ID:
	case ARM7500FE_IOC_ID:
		sound_dma_intr = IRQ_SDMA;
		break;
#endif
	}

	disable_irq(sound_dma_intr);

	if (irq_claim(sound_dma_intr, &(ag.ih)))
		panic("vidcaudio: couldn't claim IRQ %d\n", sound_dma_intr);

	disable_irq(sound_dma_intr);

	printf("\n");

	vidcaudio_dma_program(ag.silence, ag.silence+NBPG-16,
	    vidcaudio_dummy_routine, NULL);

	audio_attach_mi(&vidcaudio_hw_if, 0, sc, &sc->device);

#ifdef DEBUG
	printf(" UNDER DEVELOPMENT (nuts)\n");
#endif
}

int
vidcaudio_open(addr, flags)
	void *addr;
	int flags;
{
	struct vidcaudio_softc *sc = addr;

#ifdef DEBUG
	printf("DEBUG: vidcaudio_open called\n");
#endif

	if (sc->open)
		return EBUSY;

	sc->open = 1;
	ag.open = 1;

	return 0;
}
 
void
vidcaudio_close(addr)
	void *addr;
{
	struct vidcaudio_softc *sc = addr;

	vidcaudio_shutdown();

#ifdef DEBUG
	printf("DEBUG: vidcaudio_close called\n");
#endif

	sc->open = 0;
	ag.open = 0;
}

/* ************************************************************************* * 
 | Interface to the generic audio driver                                     |
 * ************************************************************************* */

int vidcaudio_query_encoding ( void *addr, struct audio_encoding *fp )
{
    switch ( fp->index )
    {
        case 0:
	    strcpy (fp->name, "vidc" );
            fp->encoding = AUDIO_ENCODING_ULAW;
	    fp->precision = 8;
	    fp->flags = 0;
            break;

	default:
	    return (EINVAL);
    }
    return 0;
}

int
vidcaudio_set_params(addr, setmode, usemode, p, r)
	void *addr;
	int setmode, usemode;
	struct audio_params *p, *r;
{
	if (p->encoding != AUDIO_ENCODING_ULAW ||
	    p->channels != 8)
		return EINVAL;
	vidcaudio_rate(4 * p->sample_rate / (3 * 1024)); /* XXX probably wrong */

	return 0;
}

int vidcaudio_round_blocksize ( void *addr, int blk )
{

    if (blk > NBPG)
	blk = NBPG;
    return (blk);
}

#define ROUND(s)  ( ((int)s) & (~(NBPG-1)) )

int vidcaudio_start_output ( void *addr, void *p, int cc,
			      void (*intr)(), void *arg )
{
    /* I can only DMA inside 1 page */

#ifdef DEBUG
    printf ( "vidcaudio_start_output (%d) %08x %08x\n", cc, intr, arg );
#endif

    if ( ROUND(p) != ROUND(p+cc) )
    {
        /* If it's over a page I can fix it up by copying it into my buffer */

#ifdef DEBUG
        printf ( "vidcaudio: DMA over page boundary requested.  Fixing up\n" );
#endif
        bcopy ( (char *)ag.silence, p, cc>NBPG ? NBPG : cc );
        p=(void *)ag.silence;

 	/* I can't DMA any more than that, but it is possible to fix it up  */
        /* by handling multiple buffers and only interrupting the audio     */
        /* driver after sending out all the stuff it gave me.  That it more */
        /* than I can be bothered to do right now and it probablly wont     */
        /* happen so I'll just truncate the buffer and tell the user        */

	if ( cc>NBPG )
	{
	    printf ( "vidcaudio: DMA buffer truncated. I could fix this up\n" );
	    cc=NBPG;
	}
    }
    vidcaudio_dma_program ( (vm_offset_t)p, (vm_offset_t)(p+cc), intr, arg );
    return 0;
}

int vidcaudio_start_input ( void *addr, void *p, int cc,
			     void (*intr)(), void *arg )
{
    return EIO;
}

int vidcaudio_halt_output ( void *addr )
{
#ifdef DEBUG
    printf ( "DEBUG: vidcaudio_halt_output\n" );
#endif
    return EIO;
}

int vidcaudio_halt_input ( void *addr )
{
#ifdef DEBUG
    printf ( "DEBUG: vidcaudio_halt_input\n" );
#endif
    return EIO;
}

int vidcaudio_speaker_ctl ( void *addr, int newstate )
{
#ifdef DEBUG
    printf ( "DEBUG: vidcaudio_speaker_ctl\n" );
#endif
    return 0;
}

int vidcaudio_getdev ( void *addr, struct audio_device *retp )
{
    *retp = vidcaudio_device;
    return 0;
}


int vidcaudio_set_port ( void *addr, mixer_ctrl_t *cp )
{
    return EINVAL;
}

int vidcaudio_get_port ( void *addr, mixer_ctrl_t *cp )
{
    return EINVAL;
}

int vidcaudio_query_devinfo ( void *addr, mixer_devinfo_t *dip )
{
    return ENXIO;
}

int vidcaudio_get_props ( void *addr )
{
    return 0;
}
void vidcaudio_dummy_routine ( void *arg )
{
#ifdef DEBUG
    printf ( "vidcaudio_dummy_routine\n" );
#endif
}

int vidcaudio_rate ( int rate )
{
    WriteWord ( VIDC_BASE, VIDC_SFR | rate );
    return 0;
}

int vidcaudio_stereo ( int channel, int position )
{
    if ( channel<0 ) return EINVAL;
    if ( channel>7 ) return EINVAL;
    channel = channel<<24 | VIDC_SIR0;
    WriteWord ( VIDC_BASE, channel|position );
    return 0;
}

#define PHYS(x) (pmap_extract( kernel_pmap, ((x)&PG_FRAME) ))

/*
 * Program the next buffer to be used
 * This function must be re-entrant, maximum re-entrancy of 2
 */

#define FLAGS (0)

int vidcaudio_dma_program ( vm_offset_t cur, vm_offset_t end,
			    void (*intr)(), void *arg )
{
    /* If there isn't a transfer in progress then start a new one */
    if ( ag.in_progress==0 )
    {
	ag.buffer = 0;
        IOMD_WRITE_WORD(IOMD_SD0CR, 0x90);	/* Reset State Machine */
        IOMD_WRITE_WORD(IOMD_SD0CR, 0x30);	/* Reset State Machine */

 	IOMD_WRITE_WORD(IOMD_SD0CURB, PHYS(cur));
        IOMD_WRITE_WORD(IOMD_SD0ENDB, PHYS(end-16)|FLAGS);
 	IOMD_WRITE_WORD(IOMD_SD0CURA, PHYS(cur));
        IOMD_WRITE_WORD(IOMD_SD0ENDA, PHYS(end-16)|FLAGS);

        ag.in_progress = 1;

	ag.next_cur = ag.next_end = 0;
        ag.next_intr = ag.next_arg = 0; 

	ag.intr = intr;
        ag.arg = arg;

        /* The driver 'clicks' between buffer swaps, leading me to think */
        /* that the fifo is much small than on other sound cards.  So    */
        /* so I'm going to have to do some tricks here                   */

        (*ag.intr)(ag.arg);			/* Schedule the next buffer */
	ag.intr = vidcaudio_dummy_routine;	/* Already done this        */
	ag.arg = NULL;

#ifdef PRINT
printf ( "vidcaudio: start output\n" );
#endif
#ifdef DEBUG
	printf ( "SE" );
#endif
        enable_irq(sound_dma_intr);
    }
    else
    {
        /* Otherwise schedule the next one */
	if ( ag.next_cur!=0 )
	{
	    /* If there's one scheduled then complain */
	    printf ( "vidcaudio: Buffer already Q'ed\n" );
	    return EIO;
	}
	else
	{
	    /* We're OK to schedule it now */
            ag.buffer = (++ag.buffer) & 1;
            ag.next_cur = PHYS(cur);
            ag.next_end = PHYS(end-16);
            ag.next_intr = intr;
            ag.next_arg = arg;
#ifdef DEBUG
printf ( "s" );
#endif
	}
    }
    return 0;
}

void vidcaudio_shutdown ( void )
{
    /* Shut down the channel */
    ag.intr = NULL;
    ag.in_progress = 0;
#ifdef PRINT
printf ( "vidcaudio: stop output\n" );
#endif
    IOMD_WRITE_WORD(IOMD_SD0CURB, ag.silence);
    IOMD_WRITE_WORD(IOMD_SD0ENDB, (ag.silence + NBPG - 16) | (1<<30));
    disable_irq(sound_dma_intr);
}

int vidcaudio_intr ( void *arg )
{
    int status = IOMD_READ_BYTE(IOMD_SD0ST);
    void (*nintr)();
    void *narg;
    void (*xintr)();
    void *xarg;
    int xcur, xend;
    IOMD_WRITE_WORD(IOMD_DMARQ, 0x10);

#ifdef PRINT
    printf ( "I" );
#endif

    if ( ag.open==0 )
    {
	vidcaudio_shutdown ();
	return 0;
    }

    /* Have I got the generic audio device attached */

#ifdef DEBUG
    printf ( "[B%01x]", status );
#endif

    nintr=ag.intr;
    narg=ag.arg;
    ag.intr = NULL;

    xintr=ag.next_intr;
    xarg=ag.next_arg;
    xcur=ag.next_cur;
    xend=ag.next_end;
	ag.next_cur = 0;
        ag.intr = xintr;
	ag.arg = xarg;

    if ( nintr )
    {
#ifdef DEBUG
	printf ( "i" );
#endif
	(*nintr)(narg);
    }

    if ( xcur==0 )
    {
	vidcaudio_shutdown ();
    }
    else
    {
#define OVERRUN 	(0x04)
#define INTERRUPT	(0x02)
#define BANK_A		(0x00)
#define BANK_B		(0x01)
	switch ( status&0x7 )
	{
	    case (INTERRUPT|BANK_A):
#ifdef PRINT
printf( "B" );
#endif
        	IOMD_WRITE_WORD(IOMD_SD0CURB, xcur);
        	IOMD_WRITE_WORD(IOMD_SD0ENDB, xend|FLAGS);
		break;

	    case (INTERRUPT|BANK_B):
#ifdef PRINT
printf( "A" );
#endif
        	IOMD_WRITE_WORD(IOMD_SD0CURA, xcur);
        	IOMD_WRITE_WORD(IOMD_SD0ENDA, xend|FLAGS);
		break;

	    case (OVERRUN|INTERRUPT|BANK_A):
#ifdef PRINT
printf( "A" );
#endif
        	IOMD_WRITE_WORD(IOMD_SD0CURA, xcur);
        	IOMD_WRITE_WORD(IOMD_SD0ENDA, xend|FLAGS);
		break;
		 
	    case (OVERRUN|INTERRUPT|BANK_B):
#ifdef PRINT
printf( "B" );
#endif
        	IOMD_WRITE_WORD(IOMD_SD0CURB, xcur);
        	IOMD_WRITE_WORD(IOMD_SD0ENDB, xend|FLAGS);
		break;
	}
/*
	ag.next_cur = 0;
        ag.intr = xintr;
	ag.arg = xarg;
*/
    }
#ifdef PRINT
printf ( "i" );
#endif

    if ( ag.next_cur==0 )
    {
        (*ag.intr)(ag.arg);			/* Schedule the next buffer */
	ag.intr = vidcaudio_dummy_routine;	/* Already done this        */
	ag.arg = NULL;
    }
    return(0);	/* Pass interrupt on down the chain */
}