1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
310 lines
8.2 KiB
C
310 lines
8.2 KiB
C
/*
|
|
* Mac bong noise generator. Note - we ought to put a boingy noise
|
|
* here 8)
|
|
*
|
|
* ----------------------------------------------------------------------
|
|
* 16.11.98:
|
|
* rewrote some functions, added support for Enhanced ASC (Quadras)
|
|
* after the NetBSD asc.c console bell patch by Colin Wood/Frederick Bruck
|
|
* Juergen Mellinger (juergen.mellinger@t-online.de)
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/timer.h>
|
|
|
|
#include <asm/macintosh.h>
|
|
#include <asm/mac_asc.h>
|
|
|
|
static int mac_asc_inited;
|
|
/*
|
|
* dumb triangular wave table
|
|
*/
|
|
static __u8 mac_asc_wave_tab[ 0x800 ];
|
|
|
|
/*
|
|
* Alan's original sine table; needs interpolating to 0x800
|
|
* (hint: interpolate or hardwire [0 -> Pi/2[, it's symmetric)
|
|
*/
|
|
static const signed char sine_data[] = {
|
|
0, 39, 75, 103, 121, 127, 121, 103, 75, 39,
|
|
0, -39, -75, -103, -121, -127, -121, -103, -75, -39
|
|
};
|
|
|
|
/*
|
|
* where the ASC hides ...
|
|
*/
|
|
static volatile __u8* mac_asc_regs = ( void* )0x50F14000;
|
|
|
|
/*
|
|
* sample rate; is this a good default value?
|
|
*/
|
|
static unsigned long mac_asc_samplespersec = 11050;
|
|
static int mac_bell_duration;
|
|
static unsigned long mac_bell_phase; /* 0..2*Pi -> 0..0x800 (wavetable size) */
|
|
static unsigned long mac_bell_phasepersample;
|
|
|
|
/*
|
|
* some function protos
|
|
*/
|
|
static void mac_init_asc( void );
|
|
static void mac_nosound( unsigned long );
|
|
static void mac_quadra_start_bell( unsigned int, unsigned int, unsigned int );
|
|
static void mac_quadra_ring_bell( unsigned long );
|
|
static void mac_av_start_bell( unsigned int, unsigned int, unsigned int );
|
|
static void ( *mac_special_bell )( unsigned int, unsigned int, unsigned int );
|
|
|
|
/*
|
|
* our timer to start/continue/stop the bell
|
|
*/
|
|
static struct timer_list mac_sound_timer =
|
|
TIMER_INITIALIZER(mac_nosound, 0, 0);
|
|
|
|
/*
|
|
* Sort of initialize the sound chip (called from mac_mksound on the first
|
|
* beep).
|
|
*/
|
|
static void mac_init_asc( void )
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* do some machine specific initialization
|
|
* BTW:
|
|
* the NetBSD Quadra patch identifies the Enhanced Apple Sound Chip via
|
|
* mac_asc_regs[ 0x800 ] & 0xF0 != 0
|
|
* this makes no sense here, because we have to set the default sample
|
|
* rate anyway if we want correct frequencies
|
|
*/
|
|
switch ( macintosh_config->ident )
|
|
{
|
|
case MAC_MODEL_IIFX:
|
|
/*
|
|
* The IIfx is always special ...
|
|
*/
|
|
mac_asc_regs = ( void* )0x50010000;
|
|
break;
|
|
/*
|
|
* not sure about how correct this list is
|
|
* machines with the EASC enhanced apple sound chip
|
|
*/
|
|
case MAC_MODEL_Q630:
|
|
case MAC_MODEL_P475:
|
|
mac_special_bell = mac_quadra_start_bell;
|
|
mac_asc_samplespersec = 22150;
|
|
break;
|
|
case MAC_MODEL_C660:
|
|
case MAC_MODEL_Q840:
|
|
/*
|
|
* The Quadra 660AV and 840AV use the "Singer" custom ASIC for sound I/O.
|
|
* It appears to be similar to the "AWACS" custom ASIC in the Power Mac
|
|
* [678]100. Because Singer and AWACS may have a similar hardware
|
|
* interface, this would imply that the code in drivers/sound/dmasound.c
|
|
* for AWACS could be used as a basis for Singer support. All we have to
|
|
* do is figure out how to do DMA on the 660AV/840AV through the PSC and
|
|
* figure out where the Singer hardware sits in memory. (I'd look in the
|
|
* vicinity of the AWACS location in a Power Mac [678]100 first, or the
|
|
* current location of the Apple Sound Chip--ASC--in other Macs.) The
|
|
* Power Mac [678]100 info can be found in MkLinux Mach kernel sources.
|
|
*
|
|
* Quoted from Apple's Tech Info Library, article number 16405:
|
|
* "Among desktop Macintosh computers, only the 660AV, 840AV, and Power
|
|
* Macintosh models have 16-bit audio input and output capability
|
|
* because of the AT&T DSP3210 hardware circuitry and the 16-bit Singer
|
|
* codec circuitry in the AVs. The Audio Waveform Amplifier and
|
|
* Converter (AWAC) chip in the Power Macintosh performs the same
|
|
* 16-bit I/O functionality. The PowerBook 500 series computers
|
|
* support 16-bit stereo output, but only mono input."
|
|
*
|
|
* http://til.info.apple.com/techinfo.nsf/artnum/n16405
|
|
*
|
|
* --David Kilzer
|
|
*/
|
|
mac_special_bell = mac_av_start_bell;
|
|
break;
|
|
case MAC_MODEL_Q650:
|
|
case MAC_MODEL_Q700:
|
|
case MAC_MODEL_Q800:
|
|
case MAC_MODEL_Q900:
|
|
case MAC_MODEL_Q950:
|
|
/*
|
|
* Currently not implemented!
|
|
*/
|
|
mac_special_bell = NULL;
|
|
break;
|
|
default:
|
|
/*
|
|
* Every switch needs a default
|
|
*/
|
|
mac_special_bell = NULL;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* init the wave table with a simple triangular wave
|
|
* A sine wave would sure be nicer here ...
|
|
*/
|
|
for ( i = 0; i < 0x400; i++ )
|
|
{
|
|
mac_asc_wave_tab[ i ] = i / 4;
|
|
mac_asc_wave_tab[ i + 0x400 ] = 0xFF - i / 4;
|
|
}
|
|
mac_asc_inited = 1;
|
|
}
|
|
|
|
/*
|
|
* Called to make noise; current single entry to the boing driver.
|
|
* Does the job for simple ASC, calls other routines else.
|
|
* XXX Fixme:
|
|
* Should be split into asc_mksound, easc_mksound, av_mksound and
|
|
* function pointer set in mac_init_asc which would be called at
|
|
* init time.
|
|
* _This_ is rather ugly ...
|
|
*/
|
|
void mac_mksound( unsigned int freq, unsigned int length )
|
|
{
|
|
__u32 cfreq = ( freq << 5 ) / 468;
|
|
__u32 flags;
|
|
int i;
|
|
|
|
if ( mac_special_bell == NULL )
|
|
{
|
|
/* Do nothing */
|
|
return;
|
|
}
|
|
|
|
if ( !mac_asc_inited )
|
|
mac_init_asc();
|
|
|
|
if ( mac_special_bell )
|
|
{
|
|
mac_special_bell( freq, length, 128 );
|
|
return;
|
|
}
|
|
|
|
if ( freq < 20 || freq > 20000 || length == 0 )
|
|
{
|
|
mac_nosound( 0 );
|
|
return;
|
|
}
|
|
|
|
local_irq_save(flags);
|
|
|
|
del_timer( &mac_sound_timer );
|
|
|
|
for ( i = 0; i < 0x800; i++ )
|
|
mac_asc_regs[ i ] = 0;
|
|
for ( i = 0; i < 0x800; i++ )
|
|
mac_asc_regs[ i ] = mac_asc_wave_tab[ i ];
|
|
|
|
for ( i = 0; i < 8; i++ )
|
|
*( __u32* )( ( __u32 )mac_asc_regs + ASC_CONTROL + 0x814 + 8 * i ) = cfreq;
|
|
|
|
mac_asc_regs[ 0x807 ] = 0;
|
|
mac_asc_regs[ ASC_VOLUME ] = 128;
|
|
mac_asc_regs[ 0x805 ] = 0;
|
|
mac_asc_regs[ 0x80F ] = 0;
|
|
mac_asc_regs[ ASC_MODE ] = ASC_MODE_SAMPLE;
|
|
mac_asc_regs[ ASC_ENABLE ] = ASC_ENABLE_SAMPLE;
|
|
|
|
mac_sound_timer.expires = jiffies + length;
|
|
add_timer( &mac_sound_timer );
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* regular ASC: stop whining ..
|
|
*/
|
|
static void mac_nosound( unsigned long ignored )
|
|
{
|
|
mac_asc_regs[ ASC_ENABLE ] = 0;
|
|
}
|
|
|
|
/*
|
|
* EASC entry; init EASC, don't load wavetable, schedule 'start whining'.
|
|
*/
|
|
static void mac_quadra_start_bell( unsigned int freq, unsigned int length, unsigned int volume )
|
|
{
|
|
__u32 flags;
|
|
|
|
/* if the bell is already ringing, ring longer */
|
|
if ( mac_bell_duration > 0 )
|
|
{
|
|
mac_bell_duration += length;
|
|
return;
|
|
}
|
|
|
|
mac_bell_duration = length;
|
|
mac_bell_phase = 0;
|
|
mac_bell_phasepersample = ( freq * sizeof( mac_asc_wave_tab ) ) / mac_asc_samplespersec;
|
|
/* this is reasonably big for small frequencies */
|
|
|
|
local_irq_save(flags);
|
|
|
|
/* set the volume */
|
|
mac_asc_regs[ 0x806 ] = volume;
|
|
|
|
/* set up the ASC registers */
|
|
if ( mac_asc_regs[ 0x801 ] != 1 )
|
|
{
|
|
/* select mono mode */
|
|
mac_asc_regs[ 0x807 ] = 0;
|
|
/* select sampled sound mode */
|
|
mac_asc_regs[ 0x802 ] = 0;
|
|
/* ??? */
|
|
mac_asc_regs[ 0x801 ] = 1;
|
|
mac_asc_regs[ 0x803 ] |= 0x80;
|
|
mac_asc_regs[ 0x803 ] &= 0x7F;
|
|
}
|
|
|
|
mac_sound_timer.function = mac_quadra_ring_bell;
|
|
mac_sound_timer.expires = jiffies + 1;
|
|
add_timer( &mac_sound_timer );
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* EASC 'start/continue whining'; I'm not sure why the above function didn't
|
|
* already load the wave table, or at least call this one...
|
|
* This piece keeps reloading the wave table until done.
|
|
*/
|
|
static void mac_quadra_ring_bell( unsigned long ignored )
|
|
{
|
|
int i, count = mac_asc_samplespersec / HZ;
|
|
__u32 flags;
|
|
|
|
/*
|
|
* we neither want a sound buffer overflow nor underflow, so we need to match
|
|
* the number of samples per timer interrupt as exactly as possible.
|
|
* using the asc interrupt will give better results in the future
|
|
* ...and the possibility to use a real sample (a boingy noise, maybe...)
|
|
*/
|
|
|
|
local_irq_save(flags);
|
|
|
|
del_timer( &mac_sound_timer );
|
|
|
|
if ( mac_bell_duration-- > 0 )
|
|
{
|
|
for ( i = 0; i < count; i++ )
|
|
{
|
|
mac_bell_phase += mac_bell_phasepersample;
|
|
mac_asc_regs[ 0 ] = mac_asc_wave_tab[ mac_bell_phase & ( sizeof( mac_asc_wave_tab ) - 1 ) ];
|
|
}
|
|
mac_sound_timer.expires = jiffies + 1;
|
|
add_timer( &mac_sound_timer );
|
|
}
|
|
else
|
|
mac_asc_regs[ 0x801 ] = 0;
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* AV code - please fill in.
|
|
*/
|
|
static void mac_av_start_bell( unsigned int freq, unsigned int length, unsigned int volume )
|
|
{
|
|
}
|