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