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 18 static int mac_asc_inited; 19 /* 20 * dumb triangular wave table 21 */ 22 static __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 */ 28 static 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 */ 36 static volatile __u8* mac_asc_regs = ( void* )0x50F14000; 37 38 /* 39 * sample rate; is this a good default value? 40 */ 41 static unsigned long mac_asc_samplespersec = 11050; 42 static int mac_bell_duration; 43 static unsigned long mac_bell_phase; /* 0..2*Pi -> 0..0x800 (wavetable size) */ 44 static unsigned long mac_bell_phasepersample; 45 46 /* 47 * some function protos 48 */ 49 static void mac_init_asc( void ); 50 static void mac_nosound( unsigned long ); 51 static void mac_quadra_start_bell( unsigned int, unsigned int, unsigned int ); 52 static void mac_quadra_ring_bell( unsigned long ); 53 static void mac_av_start_bell( unsigned int, unsigned int, unsigned int ); 54 static void ( *mac_special_bell )( unsigned int, unsigned int, unsigned int ); 55 56 /* 57 * our timer to start/continue/stop the bell 58 */ 59 static 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 */ 65 static 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 * Technical Information Library (TIL) article number 16405. 118 * http://support.apple.com/kb/TA32601 119 * 120 * --David Kilzer 121 */ 122 mac_special_bell = mac_av_start_bell; 123 break; 124 case MAC_MODEL_Q650: 125 case MAC_MODEL_Q700: 126 case MAC_MODEL_Q800: 127 case MAC_MODEL_Q900: 128 case MAC_MODEL_Q950: 129 /* 130 * Currently not implemented! 131 */ 132 mac_special_bell = NULL; 133 break; 134 default: 135 /* 136 * Every switch needs a default 137 */ 138 mac_special_bell = NULL; 139 break; 140 } 141 142 /* 143 * init the wave table with a simple triangular wave 144 * A sine wave would sure be nicer here ... 145 */ 146 for ( i = 0; i < 0x400; i++ ) 147 { 148 mac_asc_wave_tab[ i ] = i / 4; 149 mac_asc_wave_tab[ i + 0x400 ] = 0xFF - i / 4; 150 } 151 mac_asc_inited = 1; 152 } 153 154 /* 155 * Called to make noise; current single entry to the boing driver. 156 * Does the job for simple ASC, calls other routines else. 157 * XXX Fixme: 158 * Should be split into asc_mksound, easc_mksound, av_mksound and 159 * function pointer set in mac_init_asc which would be called at 160 * init time. 161 * _This_ is rather ugly ... 162 */ 163 void mac_mksound( unsigned int freq, unsigned int length ) 164 { 165 __u32 cfreq = ( freq << 5 ) / 468; 166 unsigned long flags; 167 int i; 168 169 if ( mac_special_bell == NULL ) 170 { 171 /* Do nothing */ 172 return; 173 } 174 175 if ( !mac_asc_inited ) 176 mac_init_asc(); 177 178 if ( mac_special_bell ) 179 { 180 mac_special_bell( freq, length, 128 ); 181 return; 182 } 183 184 if ( freq < 20 || freq > 20000 || length == 0 ) 185 { 186 mac_nosound( 0 ); 187 return; 188 } 189 190 local_irq_save(flags); 191 192 del_timer( &mac_sound_timer ); 193 194 for ( i = 0; i < 0x800; i++ ) 195 mac_asc_regs[ i ] = 0; 196 for ( i = 0; i < 0x800; i++ ) 197 mac_asc_regs[ i ] = mac_asc_wave_tab[ i ]; 198 199 for ( i = 0; i < 8; i++ ) 200 *( __u32* )( ( __u32 )mac_asc_regs + ASC_CONTROL + 0x814 + 8 * i ) = cfreq; 201 202 mac_asc_regs[ 0x807 ] = 0; 203 mac_asc_regs[ ASC_VOLUME ] = 128; 204 mac_asc_regs[ 0x805 ] = 0; 205 mac_asc_regs[ 0x80F ] = 0; 206 mac_asc_regs[ ASC_MODE ] = ASC_MODE_SAMPLE; 207 mac_asc_regs[ ASC_ENABLE ] = ASC_ENABLE_SAMPLE; 208 209 mac_sound_timer.expires = jiffies + length; 210 add_timer( &mac_sound_timer ); 211 212 local_irq_restore(flags); 213 } 214 215 /* 216 * regular ASC: stop whining .. 217 */ 218 static void mac_nosound( unsigned long ignored ) 219 { 220 mac_asc_regs[ ASC_ENABLE ] = 0; 221 } 222 223 /* 224 * EASC entry; init EASC, don't load wavetable, schedule 'start whining'. 225 */ 226 static void mac_quadra_start_bell( unsigned int freq, unsigned int length, unsigned int volume ) 227 { 228 unsigned long flags; 229 230 /* if the bell is already ringing, ring longer */ 231 if ( mac_bell_duration > 0 ) 232 { 233 mac_bell_duration += length; 234 return; 235 } 236 237 mac_bell_duration = length; 238 mac_bell_phase = 0; 239 mac_bell_phasepersample = ( freq * sizeof( mac_asc_wave_tab ) ) / mac_asc_samplespersec; 240 /* this is reasonably big for small frequencies */ 241 242 local_irq_save(flags); 243 244 /* set the volume */ 245 mac_asc_regs[ 0x806 ] = volume; 246 247 /* set up the ASC registers */ 248 if ( mac_asc_regs[ 0x801 ] != 1 ) 249 { 250 /* select mono mode */ 251 mac_asc_regs[ 0x807 ] = 0; 252 /* select sampled sound mode */ 253 mac_asc_regs[ 0x802 ] = 0; 254 /* ??? */ 255 mac_asc_regs[ 0x801 ] = 1; 256 mac_asc_regs[ 0x803 ] |= 0x80; 257 mac_asc_regs[ 0x803 ] &= 0x7F; 258 } 259 260 mac_sound_timer.function = mac_quadra_ring_bell; 261 mac_sound_timer.expires = jiffies + 1; 262 add_timer( &mac_sound_timer ); 263 264 local_irq_restore(flags); 265 } 266 267 /* 268 * EASC 'start/continue whining'; I'm not sure why the above function didn't 269 * already load the wave table, or at least call this one... 270 * This piece keeps reloading the wave table until done. 271 */ 272 static void mac_quadra_ring_bell( unsigned long ignored ) 273 { 274 int i, count = mac_asc_samplespersec / HZ; 275 unsigned long flags; 276 277 /* 278 * we neither want a sound buffer overflow nor underflow, so we need to match 279 * the number of samples per timer interrupt as exactly as possible. 280 * using the asc interrupt will give better results in the future 281 * ...and the possibility to use a real sample (a boingy noise, maybe...) 282 */ 283 284 local_irq_save(flags); 285 286 del_timer( &mac_sound_timer ); 287 288 if ( mac_bell_duration-- > 0 ) 289 { 290 for ( i = 0; i < count; i++ ) 291 { 292 mac_bell_phase += mac_bell_phasepersample; 293 mac_asc_regs[ 0 ] = mac_asc_wave_tab[ mac_bell_phase & ( sizeof( mac_asc_wave_tab ) - 1 ) ]; 294 } 295 mac_sound_timer.expires = jiffies + 1; 296 add_timer( &mac_sound_timer ); 297 } 298 else 299 mac_asc_regs[ 0x801 ] = 0; 300 301 local_irq_restore(flags); 302 } 303 304 /* 305 * AV code - please fill in. 306 */ 307 static void mac_av_start_bell( unsigned int freq, unsigned int length, unsigned int volume ) 308 { 309 } 310