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Linux/arch/m68k/mac/macboing.c

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  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 

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