1/* 2 * Mac bong noise generator. Note - we ought to put a boingy noise 3 * here 8) 4 * 5 * ---------------------------------------------------------------------- 6 * 16.11.98: 7 * rewrote some functions, added support for Enhanced ASC (Quadras) 8 * after the NetBSD asc.c console bell patch by Colin Wood/Frederick Bruck 9 * Juergen Mellinger (juergen.mellinger@t-online.de) 10 */ 11 12#include <linux/sched.h> 13#include <linux/timer.h> 14 15#include <asm/macintosh.h> 16#include <asm/mac_asc.h> 17 18static int mac_asc_inited; 19/* 20 * dumb triangular wave table 21 */ 22static __u8 mac_asc_wave_tab[ 0x800 ]; 23 24/* 25 * Alan's original sine table; needs interpolating to 0x800 26 * (hint: interpolate or hardwire [0 -> Pi/2[, it's symmetric) 27 */ 28static const signed char sine_data[] = { 29 0, 39, 75, 103, 121, 127, 121, 103, 75, 39, 30 0, -39, -75, -103, -121, -127, -121, -103, -75, -39 31}; 32 33/* 34 * where the ASC hides ... 35 */ 36static volatile __u8* mac_asc_regs = ( void* )0x50F14000; 37 38/* 39 * sample rate; is this a good default value? 40 */ 41static unsigned long mac_asc_samplespersec = 11050; 42static int mac_bell_duration; 43static unsigned long mac_bell_phase; /* 0..2*Pi -> 0..0x800 (wavetable size) */ 44static unsigned long mac_bell_phasepersample; 45 46/* 47 * some function protos 48 */ 49static void mac_init_asc( void ); 50static void mac_nosound( unsigned long ); 51static void mac_quadra_start_bell( unsigned int, unsigned int, unsigned int ); 52static void mac_quadra_ring_bell( unsigned long ); 53static void mac_av_start_bell( unsigned int, unsigned int, unsigned int ); 54static void ( *mac_special_bell )( unsigned int, unsigned int, unsigned int ); 55 56/* 57 * our timer to start/continue/stop the bell 58 */ 59static DEFINE_TIMER(mac_sound_timer, mac_nosound, 0, 0); 60 61/* 62 * Sort of initialize the sound chip (called from mac_mksound on the first 63 * beep). 64 */ 65static void mac_init_asc( void ) 66{ 67 int i; 68 69 /* 70 * do some machine specific initialization 71 * BTW: 72 * the NetBSD Quadra patch identifies the Enhanced Apple Sound Chip via 73 * mac_asc_regs[ 0x800 ] & 0xF0 != 0 74 * this makes no sense here, because we have to set the default sample 75 * rate anyway if we want correct frequencies 76 */ 77 switch ( macintosh_config->ident ) 78 { 79 case MAC_MODEL_IIFX: 80 /* 81 * The IIfx is always special ... 82 */ 83 mac_asc_regs = ( void* )0x50010000; 84 break; 85 /* 86 * not sure about how correct this list is 87 * machines with the EASC enhanced apple sound chip 88 */ 89 case MAC_MODEL_Q630: 90 case MAC_MODEL_P475: 91 mac_special_bell = mac_quadra_start_bell; 92 mac_asc_samplespersec = 22150; 93 break; 94 case MAC_MODEL_C660: 95 case MAC_MODEL_Q840: 96 /* 97 * The Quadra 660AV and 840AV use the "Singer" custom ASIC for sound I/O. 98 * It appears to be similar to the "AWACS" custom ASIC in the Power Mac 99 * [678]100. Because Singer and AWACS may have a similar hardware 100 * interface, this would imply that the code in drivers/sound/dmasound.c 101 * for AWACS could be used as a basis for Singer support. All we have to 102 * do is figure out how to do DMA on the 660AV/840AV through the PSC and 103 * figure out where the Singer hardware sits in memory. (I'd look in the 104 * vicinity of the AWACS location in a Power Mac [678]100 first, or the 105 * current location of the Apple Sound Chip--ASC--in other Macs.) The 106 * Power Mac [678]100 info can be found in MkLinux Mach kernel sources. 107 * 108 * Quoted from Apple's Tech Info Library, article number 16405: 109 * "Among desktop Macintosh computers, only the 660AV, 840AV, and Power 110 * Macintosh models have 16-bit audio input and output capability 111 * because of the AT&T DSP3210 hardware circuitry and the 16-bit Singer 112 * codec circuitry in the AVs. The Audio Waveform Amplifier and 113 * Converter (AWAC) chip in the Power Macintosh performs the same 114 * 16-bit I/O functionality. The PowerBook 500 series computers 115 * support 16-bit stereo output, but only mono input." 116 * 117 * http://til.info.apple.com/techinfo.nsf/artnum/n16405 118 * 119 * --David Kilzer 120 */ 121 mac_special_bell = mac_av_start_bell; 122 break; 123 case MAC_MODEL_Q650: 124 case MAC_MODEL_Q700: 125 case MAC_MODEL_Q800: 126 case MAC_MODEL_Q900: 127 case MAC_MODEL_Q950: 128 /* 129 * Currently not implemented! 130 */ 131 mac_special_bell = NULL; 132 break; 133 default: 134 /* 135 * Every switch needs a default 136 */ 137 mac_special_bell = NULL; 138 break; 139 } 140 141 /* 142 * init the wave table with a simple triangular wave 143 * A sine wave would sure be nicer here ... 144 */ 145 for ( i = 0; i < 0x400; i++ ) 146 { 147 mac_asc_wave_tab[ i ] = i / 4; 148 mac_asc_wave_tab[ i + 0x400 ] = 0xFF - i / 4; 149 } 150 mac_asc_inited = 1; 151} 152 153void mac_mksound( unsigned int freq, unsigned int length ) 154{ 155 __u32 cfreq = ( freq << 5 ) / 468; 156 unsigned long flags; 157 int i; 158 159 if ( mac_special_bell == NULL ) 160 { 161 /* Do nothing */ 162 return; 163 } 164 165 if ( !mac_asc_inited ) 166 mac_init_asc(); 167 168 if ( mac_special_bell ) 169 { 170 mac_special_bell( freq, length, 128 ); 171 return; 172 } 173 174 if ( freq < 20 || freq > 20000 || length == 0 ) 175 { 176 mac_nosound( 0 ); 177 return; 178 } 179 180 local_irq_save(flags); 181 182 del_timer( &mac_sound_timer ); 183 184 for ( i = 0; i < 0x800; i++ ) 185 mac_asc_regs[ i ] = 0; 186 for ( i = 0; i < 0x800; i++ ) 187 mac_asc_regs[ i ] = mac_asc_wave_tab[ i ]; 188 189 for ( i = 0; i < 8; i++ ) 190 *( __u32* )( ( __u32 )mac_asc_regs + ASC_CONTROL + 0x814 + 8 * i ) = cfreq; 191 192 mac_asc_regs[ 0x807 ] = 0; 193 mac_asc_regs[ ASC_VOLUME ] = 128; 194 mac_asc_regs[ 0x805 ] = 0; 195 mac_asc_regs[ 0x80F ] = 0; 196 mac_asc_regs[ ASC_MODE ] = ASC_MODE_SAMPLE; 197 mac_asc_regs[ ASC_ENABLE ] = ASC_ENABLE_SAMPLE; 198 199 mac_sound_timer.expires = jiffies + length; 200 add_timer( &mac_sound_timer ); 201 202 local_irq_restore(flags); 203} 204 205/* 206 * regular ASC: stop whining .. 207 */ 208static void mac_nosound( unsigned long ignored ) 209{ 210 mac_asc_regs[ ASC_ENABLE ] = 0; 211} 212 213/* 214 * EASC entry; init EASC, don't load wavetable, schedule 'start whining'. 215 */ 216static void mac_quadra_start_bell( unsigned int freq, unsigned int length, unsigned int volume ) 217{ 218 unsigned long flags; 219 220 /* if the bell is already ringing, ring longer */ 221 if ( mac_bell_duration > 0 ) 222 { 223 mac_bell_duration += length; 224 return; 225 } 226 227 mac_bell_duration = length; 228 mac_bell_phase = 0; 229 mac_bell_phasepersample = ( freq * sizeof( mac_asc_wave_tab ) ) / mac_asc_samplespersec; 230 /* this is reasonably big for small frequencies */ 231 232 local_irq_save(flags); 233 234 /* set the volume */ 235 mac_asc_regs[ 0x806 ] = volume; 236 237 /* set up the ASC registers */ 238 if ( mac_asc_regs[ 0x801 ] != 1 ) 239 { 240 /* select mono mode */ 241 mac_asc_regs[ 0x807 ] = 0; 242 /* select sampled sound mode */ 243 mac_asc_regs[ 0x802 ] = 0; 244 /* ??? */ 245 mac_asc_regs[ 0x801 ] = 1; 246 mac_asc_regs[ 0x803 ] |= 0x80; 247 mac_asc_regs[ 0x803 ] &= 0x7F; 248 } 249 250 mac_sound_timer.function = mac_quadra_ring_bell; 251 mac_sound_timer.expires = jiffies + 1; 252 add_timer( &mac_sound_timer ); 253 254 local_irq_restore(flags); 255} 256 257/* 258 * EASC 'start/continue whining'; I'm not sure why the above function didn't 259 * already load the wave table, or at least call this one... 260 * This piece keeps reloading the wave table until done. 261 */ 262static void mac_quadra_ring_bell( unsigned long ignored ) 263{ 264 int i, count = mac_asc_samplespersec / HZ; 265 unsigned long flags; 266 267 /* 268 * we neither want a sound buffer overflow nor underflow, so we need to match 269 * the number of samples per timer interrupt as exactly as possible. 270 * using the asc interrupt will give better results in the future 271 * ...and the possibility to use a real sample (a boingy noise, maybe...) 272 */ 273 274 local_irq_save(flags); 275 276 del_timer( &mac_sound_timer ); 277 278 if ( mac_bell_duration-- > 0 ) 279 { 280 for ( i = 0; i < count; i++ ) 281 { 282 mac_bell_phase += mac_bell_phasepersample; 283 mac_asc_regs[ 0 ] = mac_asc_wave_tab[ mac_bell_phase & ( sizeof( mac_asc_wave_tab ) - 1 ) ]; 284 } 285 mac_sound_timer.expires = jiffies + 1; 286 add_timer( &mac_sound_timer ); 287 } 288 else 289 mac_asc_regs[ 0x801 ] = 0; 290 291 local_irq_restore(flags); 292} 293 294/* 295 * AV code - please fill in. 296 */ 297static void mac_av_start_bell( unsigned int freq, unsigned int length, unsigned int volume ) 298{ 299} 300