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Diffstat (limited to '')
| -rw-r--r-- | arch/m68k/mac/macboing.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/arch/m68k/mac/macboing.c b/arch/m68k/mac/macboing.c new file mode 100644 index 000000000..4de6229c7 --- /dev/null +++ b/arch/m68k/mac/macboing.c @@ -0,0 +1,310 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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(struct timer_list *); +static void mac_quadra_start_bell( unsigned int, unsigned int, unsigned int ); +static void mac_quadra_ring_bell(struct timer_list *); +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 DEFINE_TIMER(mac_sound_timer, mac_nosound); + +/* + * 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." + * + * Technical Information Library (TIL) article number 16405. + * https://support.apple.com/kb/TA32601 + * + * --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; + unsigned long 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(struct timer_list *unused) +{ + 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 ) +{ + unsigned long 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(struct timer_list *unused) +{ + int i, count = mac_asc_samplespersec / HZ; + unsigned long 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 ) +{ +} |