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SDL_mintaudio_xbios.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2004 Sam Lantinga
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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)
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Patrice Mandin, Didier Méquignon
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*/
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#include <unistd.h>
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#include <support.h>
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/* Mint includes */
#include <mint/osbind.h>
#include <mint/falcon.h>
#include <mint/cookie.h>
#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
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#include "SDL_atarimxalloc_c.h"
#include "SDL_mintaudio.h"
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#include "SDL_mintaudio_dma8.h"
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/*--- Defines ---*/
#define MINT_AUDIO_DRIVER_NAME "mint_xbios"
/* Debug print info */
#define DEBUG_NAME "audio:xbios: "
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#if 0
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#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)
{
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unsigned long dummy;
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const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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/* We can't use XBIOS in interrupt with Magic, don't know about thread */
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if (Getcookie(C_MagX, &dummy) == C_FOUND) {
return(0);
}
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/* Check if user asked a different audio driver */
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if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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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)
{
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SDL_free(device->hidden);
SDL_free(device);
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}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *this;
/* Initialize all variables that we clean on shutdown */
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this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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if ( this ) {
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SDL_memset(this, 0, (sizeof *this));
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this->hidden = (struct SDL_PrivateAudioData *)
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SDL_malloc((sizeof *this->hidden));
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}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
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SDL_free(this);
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}
return(0);
}
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SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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/* 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 */
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SDL_MintAudio_WaitThread();
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Buffoper(0);
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if (!SDL_MintAudio_mint_present) {
/* Uninstall interrupt */
Jdisint(MFP_DMASOUND);
}
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/* 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();
}
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/* 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);
}
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static void Mint_CheckExternalClock(_THIS)
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{
#define SIZE_BUF_CLOCK_MEASURE (44100/10)
unsigned long cookie_snd;
char *buffer;
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int i, j;
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/* DSP present with its GPIO port ? */
if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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return;
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}
if ((cookie_snd & SND_DSP)==0) {
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return;
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}
buffer = Atari_SysMalloc(SIZE_BUF_CLOCK_MEASURE, MX_STRAM);
if (buffer==NULL) {
DEBUG_PRINT((DEBUG_NAME "Not enough memory for the measure\n"));
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return;
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}
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SDL_memset(buffer, 0, SIZE_BUF_CLOCK_MEASURE);
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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));
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if(khz==44) {
for (j=1; j<4; j++) {
SDL_MintAudio_AddFrequency(this, MASTERCLOCK_44K/(MASTERPREDIV_FALCON*(1<<j)), MASTERCLOCK_44K, (1<<j)-1, 2+i);
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}
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} else if (khz==48) {
for (j=1; j<4; j++) {
SDL_MintAudio_AddFrequency(this, MASTERCLOCK_48K/(MASTERPREDIV_FALCON*(1<<j)), MASTERCLOCK_48K, (1<<j)-1, 2+i);
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}
}
} 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 */
}
Mfree(buffer);
}
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static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
{
int i;
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Uint32 extclock;
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DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
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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 */
}
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MINTAUDIO_freqcount=0;
/* Add external clocks if present */
Mint_CheckExternalClock(this);
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/* Standard clocks */
for (i=1;i<12;i++) {
/* Remove unusable Falcon codec predivisors */
if ((i==6) || (i==8) || (i==10)) {
continue;
}
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SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)), MASTERCLOCK_FALCON1, i, -1);
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}
#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
));
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}
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#endif
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MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
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DEBUG_PRINT(("channels=%d, ", spec->channels));
DEBUG_PRINT(("freq=%d\n", spec->freq));
return 0;
}
static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
{
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int channels_mode, dmaclock, prediv;
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void *buffer;
/* Stop currently playing sound */
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SDL_MintAudio_quit_thread = SDL_FALSE;
SDL_MintAudio_thread_finished = SDL_TRUE;
SDL_MintAudio_WaitThread();
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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"));
}
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dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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if (MINTAUDIO_frequencies[MINTAUDIO_numfreq].gpio_bits != -1) {
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Gpio(GPIO_SET,7); /* DSP port gpio outputs */
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Gpio(GPIO_WRITE, MINTAUDIO_frequencies[MINTAUDIO_numfreq].gpio_bits);
Devconnect2(DMAPLAY, DAC|EXTOUT, CLKEXT, prediv);
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} else {
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Devconnect2(DMAPLAY, DAC, CLK25M, prediv);
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}
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/* Set buffer */
buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
if (Setbuffer(0, buffer, buffer + spec->size)<0) {
DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
}
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if (SDL_MintAudio_mint_present) {
SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0);
} else {
/* Install interrupt */
Jdisint(MFP_DMASOUND);
Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
Jenabint(MFP_DMASOUND);
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if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
}
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}
/* 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;
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SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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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);
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return(1); /* We don't use SDL threaded audio */
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}