/*

SDL - Simple DirectMedia Layer

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with this library; if not, write to the Free

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Sam Lantinga

slouken@libsdl.org

*/

/*

MiNT audio driver

using XBIOS functions (Falcon)

*/

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

/* Mint includes */

#include <mint/osbind.h>

#include <mint/falcon.h>

#include <mint/cookie.h>

#include "SDL_endian.h"

#include "SDL_audio.h"

#include "SDL_audio_c.h"

#include "SDL_audiomem.h"

#include "SDL_sysaudio.h"

#include "SDL_atarimxalloc_c.h"

#include "SDL_mintaudio.h"

/*--- Defines ---*/

#define MINT_AUDIO_DRIVER_NAME "mint_xbios"

/* Debug print info */

#define DEBUG_NAME "audio:xbios: "

#define DEBUG_PRINT(what) \

{ \

printf what; \

}

#else

#define DEBUG_PRINT(what)

#endif

/*--- Static variables ---*/

static unsigned long cookie_snd;

/*--- Audio driver functions ---*/

static void Mint_CloseAudio(_THIS);

static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);

static void Mint_LockAudio(_THIS);

static void Mint_UnlockAudio(_THIS);

/* To check/init hardware audio */

static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);

static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);

/*--- Audio driver bootstrap functions ---*/

static int Audio_Available(void)

{

const char *envr = getenv("SDL_AUDIODRIVER");

/* We can't use XBIOS in interrupt under MiNT */

if (Getcookie(C_MiNT, &dummy) == C_FOUND) {

return(0);

}

/* Check if user asked a different audio driver */

if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {

DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));

return(0);

}

/* Cookie _SND present ? if not, assume ST machine */

if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {

cookie_snd = SND_PSG;

}

/* Check if we have 16 bits audio */

if ((cookie_snd & SND_16BIT)==0) {

DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));

return(0);

}

/* Check if audio is lockable */

if (Locksnd()!=1) {

DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));

return(0);

}

Unlocksnd();

DEBUG_PRINT((DEBUG_NAME "XBIOS audio available!\n"));

return(1);

}

static void Audio_DeleteDevice(SDL_AudioDevice *device)

{

free(device->hidden);

free(device);

}

static SDL_AudioDevice *Audio_CreateDevice(int devindex)

{

SDL_AudioDevice *this;

/* Initialize all variables that we clean on shutdown */

this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));

if ( this ) {

memset(this, 0, (sizeof *this));

this->hidden = (struct SDL_PrivateAudioData *)

malloc((sizeof *this->hidden));

}

if ( (this == NULL) || (this->hidden == NULL) ) {

SDL_OutOfMemory();

if ( this ) {

free(this);

}

return(0);

}

memset(this->hidden, 0, (sizeof *this->hidden));

/* Set the function pointers */

this->OpenAudio = Mint_OpenAudio;

this->CloseAudio = Mint_CloseAudio;

this->LockAudio = Mint_LockAudio;

this->UnlockAudio = Mint_UnlockAudio;

this->free = Audio_DeleteDevice;

return this;

}

AudioBootStrap MINTAUDIO_XBIOS_bootstrap = {

MINT_AUDIO_DRIVER_NAME, "MiNT XBIOS audio driver",

Audio_Available, Audio_CreateDevice

};

static void Mint_LockAudio(_THIS)

{

/* Stop replay */

Buffoper(0);

}

static void Mint_UnlockAudio(_THIS)

{

/* Restart replay */

Buffoper(SB_PLA_ENA|SB_PLA_RPT);

}

static void Mint_CloseAudio(_THIS)

{

/* Stop replay */

Buffoper(0);

/* Uninstall interrupt */

Jdisint(MFP_DMASOUND);

/* Wait if currently playing sound */

while (SDL_MintAudio_mutex != 0) {

}

/* Clear buffers */

if (SDL_MintAudio_audiobuf[0]) {

Mfree(SDL_MintAudio_audiobuf[0]);

SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;

}

/* Unlock sound system */

Unlocksnd();

}

/* Falcon XBIOS implementation of Devconnect() is buggy with external clock */

static void Devconnect2(int src, int dst, int sclk, int pre)

{

static const unsigned short MASK1[3] = { 0, 0x6000, 0 };

static const unsigned short MASK2[4] = { 0xFFF0, 0xFF8F, 0xF0FF, 0x0FFF };

static const unsigned short INDEX1[4] = { 1, 3, 5, 7 };

static const unsigned short INDEX2[4] = { 0, 2, 4, 6 };

unsigned short sync_div,dev_ctrl,dest_ctrl;

void *oldstack;

if (dst==0) {

return;

}

oldstack=(void *)Super(0);

dev_ctrl = DMAAUDIO_IO.dev_ctrl;

dest_ctrl = DMAAUDIO_IO.dest_ctrl;

dev_ctrl &= MASK2[src];

if (src==ADC) {

dev_ctrl |= MASK1[sclk];

} else {

dev_ctrl |= (INDEX1[sclk] << (src<<4));

}

if (dst & DMAREC) {

dest_ctrl &= 0xFFF0;

dest_ctrl |= INDEX1[src];

}

if (dst & DSPRECV) {

dest_ctrl &= 0xFF8F;

dest_ctrl |= (INDEX1[src]<<4);

}

if (dst & EXTOUT) {

dest_ctrl &= 0xF0FF;

dest_ctrl |= (INDEX1[src]<<8);

}

if (dst & DAC) {

dev_ctrl &= 0x0FFF;

dev_ctrl |= MASK1[sclk];

dest_ctrl &= 0x0FFF;

dest_ctrl |= (INDEX2[src]<<12);

}

sync_div = DMAAUDIO_IO.sync_div;

if (sclk==CLKEXT) {

pre<<=8;

sync_div &= 0xF0FF;

} else {

sync_div &= 0xFFF0;

}

sync_div |= pre;

DMAAUDIO_IO.dev_ctrl = dev_ctrl;

DMAAUDIO_IO.dest_ctrl = dest_ctrl;

DMAAUDIO_IO.sync_div = sync_div;

Super(oldstack);

}

static Uint32 Mint_CheckExternalClock(void)

{

#define SIZE_BUF_CLOCK_MEASURE (44100/10)

unsigned long cookie_snd;

Uint32 masterclock;

char *buffer;

int i;

/* DSP present with its GPIO port ? */

if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {

return 0;

}

if ((cookie_snd & SND_DSP)==0) {

return 0;

}

buffer = Atari_SysMalloc(SIZE_BUF_CLOCK_MEASURE, MX_STRAM);

if (buffer==NULL) {

DEBUG_PRINT((DEBUG_NAME "Not enough memory for the measure\n"));

return 0;

}

memset(buffer, 0, SIZE_BUF_CLOCK_MEASURE);

masterclock=0;

Buffoper(0);

Settracks(0,0);

Setmontracks(0);

Setmode(MONO8);

Jdisint(MFP_TIMERA);

for (i=0; i<2; i++) {

Gpio(GPIO_SET,7); /* DSP port gpio outputs */

Gpio(GPIO_WRITE,2+i); /* 22.5792/24.576 MHz for 44.1/48KHz */

Devconnect2(DMAPLAY, DAC, CLKEXT, CLK50K); /* Matrix and clock source */

Setbuffer(0, buffer, buffer + SIZE_BUF_CLOCK_MEASURE); /* Set buffer */

Xbtimer(XB_TIMERA, 5, 38, SDL_MintAudio_XbiosInterruptMeasureClock); /* delay mode timer A, prediv /64, 1KHz */

Jenabint(MFP_TIMERA);

SDL_MintAudio_clocktics = 0;

Buffoper(SB_PLA_ENA);

usleep(110000);

if((Buffoper(-1) & 1)==0) {

if (SDL_MintAudio_clocktics) {

unsigned long khz;

khz = ((SIZE_BUF_CLOCK_MEASURE/SDL_MintAudio_clocktics) +1) & 0xFFFFFFFE;

DEBUG_PRINT((DEBUG_NAME "measure %d: freq=%lu KHz\n", i+1, khz));

if (i==0) {

if(khz==44) {

masterclock = MASTERCLOCK_44K;

}

} else {

if(khz==48) {

masterclock = MASTERCLOCK_48K;

}

}

} else {

DEBUG_PRINT((DEBUG_NAME "No measure\n"));

}

} else {

DEBUG_PRINT((DEBUG_NAME "No SDMA clock\n"));

}

Buffoper(0); /* stop */

Jdisint(MFP_TIMERA); /* Uninstall interrupt */

if (masterclock == 0)

break;

}

Mfree(buffer);

return masterclock;

}

static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)

{

int i;

DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));

DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));

DEBUG_PRINT(("channels=%d, ", spec->channels));

DEBUG_PRINT(("freq=%d\n", spec->freq));

spec->format |= 0x8000; /* Audio is always signed */

if ((spec->format & 0x00ff)==16) {

spec->format |= 0x1000; /* Audio is always big endian */

spec->channels=2; /* 16 bits always stereo */

}

extclock=Mint_CheckExternalClock();

/* Standard clocks */

MINTAUDIO_freqcount=0;

for (i=1;i<12;i++) {

/* Remove unusable Falcon codec predivisors */

if ((i==6) || (i==8) || (i==10)) {

continue;

}

SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)), MASTERCLOCK_FALCON1, i);

}

if (extclock>0) {

for (i=1; i<4; i++) {

SDL_MintAudio_AddFrequency(this, extclock/(MASTERPREDIV_FALCON*(1<<i)), extclock, (1<<i)-1);

}

}

#if 1

for (i=0; i<MINTAUDIO_freqcount; i++) {

DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",

i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,

MINTAUDIO_frequencies[i].predivisor

));

MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);

spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;

DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));

DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));

DEBUG_PRINT(("channels=%d, ", spec->channels));

DEBUG_PRINT(("freq=%d\n", spec->freq));

return 0;

}

static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)

{

void *buffer;

/* Stop currently playing sound */

Buffoper(0);

/* Set replay tracks */

Settracks(0,0);

Setmontracks(0);

/* Select replay format */

channels_mode=STEREO16;

switch (spec->format & 0xff) {

case 8:

if (spec->channels==2) {

channels_mode=STEREO8;

} else {

channels_mode=MONO8;

}

break;

}

if (Setmode(channels_mode)<0) {

DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));

}

dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;

prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;

if (dmaclock != MASTERCLOCK_FALCON1) {

Gpio(GPIO_SET,7); /* DSP port gpio outputs */

if (dmaclock == MASTERCLOCK_44K) {

Gpio(GPIO_WRITE,2); /* 22.5792 MHz for 44.1KHz */

} else {

Gpio(GPIO_WRITE,3); /* 24.576 MHz for 48KHz */

}

Devconnect2(DMAPLAY, DAC, CLKEXT, prediv);

} else {

Devconnect(DMAPLAY, DAC, CLK25M, prediv, 1);

}

/* Set buffer */

buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];

if (Setbuffer(0, buffer, buffer + spec->size)<0) {

DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));

}

/* Install interrupt */

Jdisint(MFP_DMASOUND);

Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);

Jenabint(MFP_DMASOUND);

if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {

DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));

}

/* Go */

Buffoper(SB_PLA_ENA|SB_PLA_RPT);

DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));

}

static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)

{

/* Lock sound system */

if (Locksnd()!=1) {

SDL_SetError("Mint_OpenAudio: Audio system already in use");

return(-1);

}

SDL_MintAudio_device = this;

/* Check audio capabilities */

if (Mint_CheckAudio(this, spec)==-1) {

return -1;

}

SDL_CalculateAudioSpec(spec);

/* Allocate memory for audio buffers in DMA-able RAM */

DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));

SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);

if (SDL_MintAudio_audiobuf[0]==NULL) {

SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");

return (-1);

}

SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;

SDL_MintAudio_numbuf=0;

memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);

SDL_MintAudio_audiosize = spec->size;

SDL_MintAudio_mutex = 0;

DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));

DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));

/* Setup audio hardware */

Mint_InitAudio(this, spec);

return(1); /* We don't use threaded audio */

}